IR-type single-suction single-suction horizontal hot water centrifugal pump structure

First, the product overview IR-type single-suction single-suction horizontal hot water centrifugal pump, the structure of the horizontal suspension, radial section, the rear door, the center support, suitable for conveying high temperature cleaning medium. Products meet GB5656-1994 "centrifugal pump technical conditions (II)" and GB3215 "refinery, chemical and petrochemical processes centrifugal pump general technical conditions." Mainly used in metallurgy, chemical industry, power plants, heating, textile, waste heat utilization, heat exchange devices. IR pump for the single-stage single suction Horizontal Hot Water Centrifugal Pump Structure II, the product features 1, energy-efficient: CFD CFD, analysis and calculation of the pressure distribution within the pump and the velocity distribution to optimize the pump flow channel design , To ensure that the pump has a high efficiency of the hydraulic line, improve the efficiency of the pump. 2, high temperature structure: the pump body support center to solve the pump in the delivery of high temperature medium to prevent high temperature pump thermal expansion caused by inconsistencies in the stress concentration and the coupling on the center of change. Pump support, pump cover, suspension body (bearing part) and the machine cover gland have cooling chamber, respectively, at different temperatures with cooling water cooling or air cooling. 3, bearings: bearing cylindrical roller bearings and two angular contact bearings supporting the use of thin oil lubrication, bearing capacity increased significantly. Bearing design life of 25,000 hours. 4, shaft seal: optional soft packing seal and mechanical seal. 5, Coupling: Adopt flexible pin shaft coupling, high transmission precision. 6, auxiliary pipeline: According to API 610 version 8 requirements configuration. 7, pressure: design pressure of 4.0MPa, high pressure. Third, the working conditions Flow: 3.8 ~ 660m3 / h Head H: 7 ~ 240m Temperature: ≤ 175 ℃ (HT200) 175 ℃ ~ 230 ℃ (hot water) 230 ℃ ~ 400 ℃ (heat medium)

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Power protection against rust steel rod do

Power steel rod rust methods are there? Many power rust steel bar method, briefly as follows: where is the power with anti-rust paint steel bar most popular and most commonly used solutions.
1. If the power to change the composition of steel rod metal, increasing copper, chromium or nickel and other alloying elements;
2. The use of metal plating protection, such as electroplating or hot-dip galvanizing and other methods;
3. treatment with chemical oxidation power steel rod protection, such as phosphate treatment, the upcoming steel immersion solution containing hydrogen phosphate, iron phosphate and manganese hydrogen phosphate, the resulting iron phosphate and manganese phosphate insoluble protective film;
4. Non-metallic corrosion protection layer, such as coatings, plastics and other metal surface will power steel rod protected, so that from the media

Our steel poles are made from quality sheet through bending, forming, automatic welding and hot galvanization. We can reach one-run machining length of 14m and can bend sheet of thickness up to 45mm. We adopt advanced welding procedures, automatically weld main joints and reach rank-II welding quality. We have got 500kV Transmission Line Tubular Tower Quality Certificate from Power Industry Steel Tower Qualified Inspection & Test Center from 2009 year.

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Application of Water Source Heat Pump Air Conditioning System in Jinyuan Coal Mine

Water source heat pump technology is through the use of shallow surface water absorption of solar and geothermal energy formed by the low heat energy resources, supplemented by a small amount of electricity in winter, from relatively high temperature water source to extract heat from the heat pump unit through the air or water as a carrier for the Building heating; summer uses the relative low temperature of the water to remove heat from the building. Air-cooled heat pumps use air and electricity to do all this. According to various considerations and local hydrogeological conditions and the future economic, environmental protection and energy saving measures, we try to adopt water source heat pump system to design this area and obtain better results. The results are summarized as follows , There are deficiencies, willing to please correct me.

1 project overview

Jinyuan coal mine administrative office area and police, prisoners living area covers an area of ​​30,000 m 2 , the mining area sub-office building, dormitory, hospital building and teaching building four.

2 Economic Analysis

Four solutions have been initially designed by the Design Institute of the School of Architecture and Design. Due to various considerations, two of them were rejected and the analysis and selection of the remaining water source heat pump central air-conditioning and air-cooled heat pump central air-conditioning schemes were required.

The initial investment and operating costs of the two programs conducted a preliminary economic analysis. Initial investment costs are shown in Table 3, operating costs more in Table 4.

3 design to determine

Air conditioning design standards

3.1 Design parameters (see Table 1 Table 2)

Air conditioning interior design parameters

	Dry bulb temperature / ℃	Relative humidity/?	Fresh air volume / m 3 h	Noise / dB (A sound level)
summer	24 ~ 28	50 ~ 70	20	≯60
winter	18 ~ 20	/	20	≯60

Air conditioning outdoor design parameters

	Dry bulb temperature / ℃	Wet bulb temperature / ℃	Relative humidity/?	Atmospheric pressure kPa
summer	33.5	27.7	83	100.45
winter	5	/	70	101.95

3.2 load calculation

Cold load: air conditioning load in the mining area includes heat transfer of building envelope, equipment cooling, body cooling, lighting and cooling. The heat transfer of the envelope is calculated according to the calculation method in Practical Manual of Heating and Air-conditioning Designing and calculated by combining with other heat sources. The air-conditioning cooling load index is 2676W / m 2 and the heat load is 2072W / m 2 .

From Table 3, we can see that the overall cost of air-cooled heat pump central air conditioning is higher than the water source heat pump central air conditioning, and air-cooled heat pump cooling heat coefficient with the outside world constantly changing temperature, resulting in unstable cooling system, resources Serious waste And water source heat pump units and air-cooled heat pump unit, has the following advantages:

a) The water source is deep well water, the temperature of water body is relatively constant, the operation of the unit is more reliable and stable, the efficiency and economy of the system are ensured, and the operation and maintenance costs are extremely low without any special maintenance or operation.

b) outdoor unit without special defrosting equipment, equipment is simple.

c) As the heat source temperature of the water source heat pump is relatively stable throughout the year, it is generally 10-25 ° C. Its cooling and heating coefficient can reach 3.5-4.4, which is about 40% higher than the traditional air source heat pump. Its operation The cost of ordinary central air-conditioning 50 to 60%.

d) is a renewable energy technology

Water source heat pump is the use of the Earth's water storage of solar energy resources as a source of cold and heat, energy conversion heating and air conditioning system. Among the available water bodies are groundwater or rivers, rivers and lakes that are part of the surface, and oceans. Surface soil and water bodies are not only huge solar collectors that collect 47% of the solar radiation energy, more than 500 times the amount of energy used annually by human beings (underground water bodies receive indirect solar radiation energy through the soil) and are A huge dynamic energy balance system, the soil and water on the surface naturally maintain the relative balance of energy acceptance and divergence. This makes it possible to utilize almost infinite solar energy or earth stored therein. So, a water source heat pump uses a technology that is clean and renewable.

e) energy efficient

Water source heat pump unit available water temperature in winter is 12-22 ℃, the water temperature is higher than the ambient air temperature, so the heat pump cycle evaporation temperature increases, energy efficiency ratio also increased. The summer water body is 18-35 ℃, the temperature of the water body is lower than the ambient air temperature, so the condensing temperature of the cooling decreases, making the cooling effect better than the air-cooled and cooling towers, and the unit efficiency is improved. According to the EPA of the United States Environmental Protection Agency, the design and installation of a good water source heat pump can save 30-40% of the heating and cooling air-conditioners on average.

f) stable and reliable operation

The temperature of water body is relatively stable throughout the year, the range of its fluctuation is far less than the change of air. Is a very good heat pump heat source and air conditioning cold source, water temperature is more constant characteristics, making the heat pump operation more reliable and stable, but also to ensure the system's efficiency and economy. There is no air source heat pump in winter defrost and other difficult issues.

g) significant environmental benefits

Water source heat pumps use electricity, which itself is a clean source of energy, but consumes primary energy and generates emissions of greenhouse gases such as pollutants and carbon dioxide when generating electricity. Therefore, the pollution of energy-saving equipment itself is small. The power consumption of well-designed water-source heat pump units is equivalent to a reduction of more than 30% compared to air-source heat pumps, which is equivalent to a reduction of more than 70% when compared to electric heating.

Water source heat pump technology used by the refrigerant, can be R22 or R134A, R407C and R410A alternatives such as co-quality.

Water source heat pump units operate without any pollution and can be built in residential areas without burning, without fumes or with waste, without the need to stack fuel waste and without the heat from long distances.

h) A multi-purpose machine, a wide range of applications

Water source heat pump system can be heating, air conditioning, but also for domestic hot water, a multi-purpose machine, a system that can replace the original boiler plus air-conditioned two sets of devices or systems. Especially for buildings with both heating and cooling requirements, water-source heat pumps have obvious advantages. Not only saves a lot of energy, but also with a set of equipment to meet both heating and cooling requirements, reducing the initial investment of equipment. Water source heat pump can be applied to hotels, shopping malls, office buildings, schools and other buildings, small water source heat pump is more suitable for residential heating, air conditioning.

i) Automatic operation

Water source heat pump unit because of stable conditions, so you can design a simple system, fewer components, simple and reliable unit operation, low maintenance costs; a high degree of automatic control, the service life of up to 15 years.

Of course, like any thing, water source heat pump is not perfect, its application will be constrained.

⑴ available water conditions

Water source heat pump theory can make use of all the water resources, in fact, in actual projects, the cost difference of different water resources utilization is quite large. So in different regions whether there is a suitable water source heat pump applications become a key. The current water source heat pump use, the closed system is generally higher cost. The open system, can find the right water to become a source of heat pump restrictions. On the open system, water requirements must meet a certain temperature, water and cleanliness.

⑵ water layer of the geographical structure of the restrictions

For the use of underground pumping backwaters, the geologic structure of the site to be used must be taken into account to ensure that wells can be drilled economically to find a suitable source of water, taking into account local geological and soil conditions and ensuring that the tail water after use Recharge can be achieved.

⑶ investment economy

Due to different regions, different users and the country's energy policy, the impact of fuel prices, the basic conditions of water is different; one-time investment and operating costs will vary with the user. Although, on the whole, water-source heat pumps operate at a higher cost and with lower costs, However, compared with the traditional air-conditioning and cooling heating methods, the water-source heat pump investment economy will be different under different requirements of different regions.

From Table 1, Table 2 shows that the overall cost of air-cooled heat pump central air conditioning is higher than the water source heat pump central air conditioning. After analysis and comparison, and full consultation with the constructor, the final decision to use water-source heat pump central air conditioning to solve the summer coal-source air conditioning and heating issues in Jinyuan.

Table 3 Comparison of initial investment costs (data not related to this project)

	Water source heat pump central air conditioning		Air-cooled heat pump central air conditioning
Serial number	project	Initial investment (yuan)	project	Initial investment (yuan)
1	Water source heat pump unit (1)	42000	Air-cooled heat pump unit (1)	89800
2	Fan coil (14)	13300	Fan coil (14)	13300
3	Vertical pipe pump (1)	1980	Vertical pipe pump (1)	1980
4	Electronic water treatment instrument (1)	4500	Electronic water treatment instrument (1)	4500
5	Square expansion tank (1)	1500	Square expansion tank (1)	1500
6	Pipelines, valves and other security fees	37600	Pipelines, valves and other security fees	27340
7	Duct, tuyere system security fee	24500	Duct, tuyere system security fee	24500
8	Insulation materials and installation costs	19700	Insulation materials and installation costs	21300
9	Rotary mud deodorizer (1)	4620	Power Distribution System (1 set)	7450
10	Power Distribution System (1 set)	8700
total		158400		191670

Note: The initial investment of water source heat pump central air conditioning system did not account for the cost of civil drilling.

Table 4 Comparison of annual operating costs (data has nothing to do with the project)

	Water source heat pump central air conditioning		Air-cooled heat pump central air conditioning
Serial number	project	Operating costs / yuan	project	Operating costs / yuan
1	Water source heat pump (12kW)	11880	Air-cooled heat pump (16.8kW)	16632
total		11880		16632

Note: 1) According to Table 1 equipment in the two systems for different power consumption comparison.

2) All equipment is operated 180 days a year, running 18 hours a day, electricity 0.55 yuan / (kWh) calculation.

4 air conditioning system design

4.1 Because the design has not yet decided decorating the program, can not be informed of the decoration of the room, only consider the use of fan coil side of the installation of hair. (After the decoration pattern by different indoor unit, try to be beautiful and generous.)

4.2 cold heat source equipment:

Chiller: Three water source heat pump units, cooling capacity / heating capacity = 63.6 / 69.8kW

Cold water system supporting pumps: horizontal centrifugal pump five, flow 15t / h, head 20m.

Cooling water submersible pump: eight, the project by the Party according to the actual needs of setting.

4.3 system form

The chilled water is double-controlled fan coil closed system, the indoor unit is hung below the indoor floor, the water source heat pump unit and horizontal centrifugal pump for cold water circulation and other equipment are arranged in the air-conditioned room. Cooling water using groundwater as water recycling.

1-circulating pump 2-electronic water treatment instrument

3-square expansion tank 4-cyclone desander

Figure 1 system flow chart

4.4 well water recharge

The design uses a pressurized recharge method, pumping well and recharge well spacing distribution, so that well water fully recharge, thus ensuring the wells will not be destroyed. In addition, during the well-forming process, a sealing water seal is used in the upper part of the well, the well room is filled with concrete and the depth of the well wall is 1 meter, which is different from the well room. On this basis, well water recharge increases the pressure and recharge again, Water 100% recharge. At the same time does not affect the building foundation, to ensure the safety of ground buildings. System flow chart shown in Figure 1.

4.5 well water guarantee measures

The design of the water is used deep well water, water temperature is constant. Water well structure aquifer is a bridge filter, the rock layer is a spiral pipe, spiral pipe to ensure the structure of the borehole wall is not affected. The most important point is the filter material between the aquifer and the filter tube. The polygon-shaped filter stones (hard bean paste can also be used) in this design can ensure the smooth circulation and recharge of the groundwater.

4.6 system control flow chart

The system uses Tsinghua Tongfang host (SGH-1000) three, the host compressor load control based on the size of the temperature difference using stepless adjustment (25%, 50%, 75%), reducing the general compressor from start to stop are 100% work caused by unnecessary waste of resources. Cooling water using automatic frequency control, according to the pressure regulating the work of the pump frequency and quantity. Now the only drawback is the chilled water pump, cooling water pump, the host did not achieve linkage and remote control, that is, the host as the core drive the pump to maximize resource conservation, and ultimately will truly central air-conditioned room unattended purpose.

4.7 shock absorption, energy-saving measures

In order to prevent equipment vibration noise, water inlet and outlet, the pump import and export of rubber soft joints, pump foundation cushion. Set on the basis of concrete, and add shock pad.

In order to save energy and reduce consumption, the winter of this system makes full use of the characteristic of low outdoor temperature in winter, and the natural cooling water is poured into deep well to realize "winter irrigation and summer" use. Centrifugal glass wool and forflex Insulation, reduce the consumption of hot and cold.

5 operating results

Since the system was put into use in the winter of 2004, overall operation in winter and summer has been in good condition. There is no phenomenon of well water recharging and large-scale thermal imbalance. Both the builders and the owners are satisfied.

6 Conclusion

Nowadays, human beings are getting more and more strict on environmental protection. At the same time, various kinds of energy are depleted with the increase of use, forcing people to continuously adopt more advanced and energy-saving environmental air-conditioners and more advanced and energy-saving operation plans. Water source heat pump system is the use of groundwater or underground soil perennial temperature remains constant characteristics of energy conversion heating and air conditioning system is environmentally friendly, energy saving, "zero" pollution, "zero" emissions of an air-conditioning equipment. It does not require cooling towers and other devices, the initial investment and operating costs are lower than the traditional warm and cold, and groundwater temperature stability, little affected by the outside world, the unit's cooling and heating functions to play better. With the increasing popularity of air conditioning, water source heat pump system will certainly be more attention and support from all walks of life, the application will be more extensive.

Dry bulb temperature / ℃

Relative humidity/?

Fresh air volume / m 3 h

Noise / dB (A sound level)

summer

24 ~ 28

50 ~ 70

20

≯60

winter

18 ~ 20

/

20

≯60

Dry bulb temperature / ℃

Wet bulb temperature / ℃

Relative humidity/?

Atmospheric pressure kPa

summer

33.5

27.7

83

100.45

winter

5

/

70

101.95

Water source heat pump central air conditioning

Air-cooled heat pump central air conditioning

Serial number

project

Initial investment (yuan)

project

Initial investment (yuan)

1

Water source heat pump unit (1)

42000

Air-cooled heat pump unit (1)

89800

2

Fan coil (14)

13300

Fan coil (14)

13300

3

Vertical pipe pump (1)

1980

Vertical pipe pump (1)

1980

4

Electronic water treatment instrument (1)

4500

Electronic water treatment instrument (1)

4500

5

Square expansion tank (1)

1500

Square expansion tank (1)

1500

6

Pipelines, valves and other security fees

37600

Pipelines, valves and other security fees

27340

7

Duct, tuyere system security fee

24500

Duct, tuyere system security fee

24500

8

Insulation materials and installation costs

19700

Insulation materials and installation costs

21300

9

Rotary mud deodorizer (1)

4620

Power Distribution System (1 set)

7450

10

Power Distribution System (1 set)

8700

total

158400

191670

Water source heat pump central air conditioning

Air-cooled heat pump central air conditioning

Serial number

project

Operating costs / yuan

project

Operating costs / yuan

1

Water source heat pump (12kW)

11880

Air-cooled heat pump (16.8kW)

16632

total

11880

16632

Wheel Bolts

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St. Rainbow into people's lives bring you a healthy experience!

Based on the philosophy of science and technology, environmental protection, health, fashion and people-oriented, Saint-Tianhong brand independently developed series of far-infrared carbon fiber products and continuously explored and innovated on the road of smart wear and healthy clothing. Has more than ten practical patented technology, all products certified by the national professional sector qualified, so you rest assured purchase, rest assured that use!

Sheng Tianhong brand activities at the scene

Sheng Tianhong brand activities at the scene

Sheng Tianhong brand activities at the scene

Nowadays in more and more countries, more and more people begin to advocate healthy life philosophy, healthy life style and healthy products. Sheng Tianhong brand to improve the health of Chinese people and endless struggle, to lead the Chinese fashion trend and go all out! Yesterday, St. Rainbow organized a very meaningful offline activities, the products of St. Rainbow into people's lives, sent to a healthy life experience. Let everyone know more Sheng Tianhong products, as well as the concept of health. Event site is full of people, all want to know St. Rainbow products, and the use of. This shows that people have a new understanding of health products and needs.

Sheng Tianhong brand activities at the scene

Sheng Tianhong brand activities at the scene

Sheng Tianhong brand activities at the scene

2017 St. Rainbow will continue to innovate, bring you more and healthier products, let us wait, to jointly verify the growth of St. Rainbow!

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Strategies to optimize pump system efficiency and life cycle performance

Process pumps are one of the largest energy consumption in the plant and increasing the efficiency of the pumping system is a new shortcut for reducing plant operating costs.

The ever-changing business climate is prompting businesses to make many changes to their traditional operating practices. Market globalization, demand adjustments, and stakeholder interests all require factories to find new ways to further reduce their production costs.

In recent years, although enterprises are increasingly using information technology (IT) to improve productivity, such as enterprise resource planning and supply chain management. But while the factory is equipping its business systems with the latest IT tools, they are still using outdated and inefficient motor- driven pumping systems to run the production process.

Today, inefficient motor-driven pumping systems are a weak link in the production process management. More specifically, the efficiency of a motor-driven pump system can play an important role in optimizing the production process. Although it is often overlooked, using technologies that increase its efficiency can dramatically reduce energy consumption and reduce maintenance and raw material consumption.

For example: Pumped liquids typically consume the largest portion of the energy consumed by industrial motors throughout the pulp and paper lines and in the process. Optimizing the efficiency of the pumping system increases the stability of the pump and process, while achieving 20% ​​to 50% improvement potential for energy savings and reduced maintenance costs. In addition to hindering the overall increase in production efficiency, inefficient pumping performance can result in reduced product quality, lost production time, indirect damage to equipment, and excessive maintenance costs.

Larger is not always better

The efficiency of the entire plant is often influenced by the correct selection, installation and maintenance of the pump system. Standard industrial practices often increase the size of the pump to ensure that it meets the needs of the process peak. In the past, this practice was accepted when the paper mill had a continual order need for all its forestry-based products.

But today, things are different. The globalization of markets has led directly to excess reserves of pulp products and excess capacity. This change in situation determines that oversized selection of pumps should be re-examined.

In 1996, "a Finnish Technical Research Center released a report entitled centrifugal pump performance diagnostics expert analysis report" shows: by analyzing 20 factories pump 1690, found that the average efficiency of the pump is less than 40%, and 10% of the pump Operating efficiency is less than 10%. Pump oversizing and throttling control valves were identified as the two main causes of excessive energy consumption.

Strategy to improve pump efficiency

The initial purchase price of a process pump is typically less than 15% of its life cycle cost (LCC). A 50 horsepower pump has a life cycle cost of installation, operation, maintenance and system downtime that is several times the original purchase cost. In general, energy costs can account for about 30% of pump life cycle costs and up to 40% for maintenance costs. If used for more than 20 years, the cost of energy and maintenance will exceed 10 times the initial purchase cost, and this part of the cost can be significantly reduced by increasing efficiency.

Pump system performance is affected by the following factors

Individual efficiency of the pump and its system components

The entire system design

Pump control effect

· Drive part of the efficiency

· Appropriate maintenance cycle

The factory's system assessment helps identify and quantify the best solution to improve pumping system efficiency.

The most potential system to improve the efficiency of the program is as follows

Improve motor efficiency through replacement and product upgrades

The best match each part selection and load requirements

Reduce the load on the motor by improving process and system design

• Use pump speed adjustment instead of throttling control valve or return device

Also, the following features indicate potential for system efficiency improvements when performing pump system evaluation: Throttle valves, normally open return lines, all pumps in a multi-pump parallel system are always running, and pump operation that is constant during a batch process , The existence of cavitation noise.

Table 1: Control Valve and Speed ​​Adjustment Under the same flow conditions

Intelligent flow control

The development and application of frequency converters (VFDs), and in particular the application of intelligent control drives for pumping control, have led to major changes in the operating practices of control valves as a flow master. In the past, frequency converters (VFDs) were used to reduce energy consumption or conventional control is not good. In fact, the Intelligent Pumping System is an optimized solution for pumping systems with intelligent software integrated into the drive's microprocessor chip.

Smart drives keep the pump running close to its best efficiency point (BEF) and protect the pump from mechanical damage when the pump runs off its best efficiency point. The latest research shows that pump operation near the best efficiency point Pump efficiency and operational reliability have been dramatically improved. Table 1 compares the control valve differential pressure, pump speed and efficiency fluctuations under different flow needs.

The intelligent variable frequency drive allows the pump to run at the optimum impeller diameter and at lower speeds, which further increases the reliability of the pump and results in a considerable improvement in mean time between failure (MTBF). In new projects, the purchase and installation costs of control valves are saved, followed by savings in energy and maintenance costs, which can result in a significant reduction in the total life cycle cost of the pumping system.

Once put into use, intelligent variable frequency drive technology can provide the following changes

Automatic adjustment to adapt to process changes

Automatic adjustment to adapt to changes in the pump system

Protect the pump during system failure

Provide real-time status monitoring

Sensor and control software already deployed Intelligent pumping systems provide smooth drive and capacity changes, tighter control over continued production, and potential problems with the system when it has no negative impact on product quality or process operation More rapid diagnosis. As shown in Figure 1.

Figure 1: Schematic diagram of the pump system, comparing the difference between a traditional pumping system and an intelligent pumping system.

Energy saving

As shown in Table 2, in the pulp and paper industry, pumps consume most of the motor energy. In fact, the concentrated energy consumption of process pumps makes them the main choice for saving energy and reducing consumption.

Table 2: Pumping system is a source of concentrated energy.

Different types of process pump mechanical design will consider efficient operation. In practice, the design is designed to determine the size of the pump to operate at the point of maximum efficiency under normal operating conditions. However, process requirements and throughput requirements often change significantly over time. As a result, finding a constant speed pump to run at the best efficiency point is like "shooting a moving target."

Flow pumps in all of the plant's rotating equipment have the greatest potential for energy savings. By intelligently controlling the motor speed in real time, the intelligent pumping system adjusts energy usage as needed. Through the motor speed adjustment to meet the precise process requirements, and to avoid unnecessary energy consumption.

Case studies show that up to 50% or more of the energy can be saved by optimizing pump performance. In addition, consuming too much energy on a normal speed pump is not used on the pumped liquid, but rather on the pump body and results in reduced pump system reliability.

In addition to reduced energy consumption, the biggest advantage of an intelligent pumping system is the resolution and elimination of recurrent operational problems encountered by the plant's production, maintenance and engineering departments. Under normal circumstances, the highest failure rate of equipment in the centrifugal pump, the seal leak is one of the longest production downtime and maintenance costs of the highest failure. Pump system optimization helps to reduce unplanned parking and increase production.

Pump system optimization helps to reduce unplanned parking and increase production.

Improve equipment management

A successful, predictable maintenance strategy for motor-driven pumping systems should include the use of on-line monitoring of intelligent pumping systems. Related monitoring information can be passed to the device management software integrated into the process control system or sent to the CMMS for alarm and history archiving.

In the past, equipment information needs to be manually collected and archived, or frequently by hand into the computer maintenance management system. After years of development, automated equipment condition monitoring systems have matured, especially on large rotating equipment such as turbines, but are less used in predictive maintenance. Factories generally still rely on established predictive overhauls and emergency remedial repairs.

By developing predictive maintenance capabilities, the maintenance department can continuously check and update equipment status information in real time. Real-time analysis of equipment data provides practical information to plan maintenance work, which is more effective than scheduling a scheduled time since last parking maintenance. The main advantages over planned maintenance are extended continuous operation, increased operational mobility and, more importantly, reduced maintenance. Figure 2 shows that the cost of a predictive maintenance approach is significantly reduced over the established preventive maintenance approach or remedial maintenance approach.

Figure 2: Predictive maintenance saves money.

With predictive maintenance, tangible device status information replaces speculation about the status of the device, allowing the plant to begin planning and scheduling time after it receives a forecast of device status drops. Factories no longer have to be forced to repair damaged equipment. As a result, maintenance operations that used to rely primarily on human history such as equipment history, experience, and intuition, have now become a scientific process for fault identification.

in conclusion

In the past, the manufacturing industry used process instrumentation to measure physical and chemical variables in processes. Although sensors were also used to monitor equipment such as pumps, compressors and other rotating equipment, it was limited to some very expensive equipment. Today, with the growth of intelligent devices and digital communications, traditional process control and equipment management functions are gradually integrated into the process management system.

The emergence of smart pumps has become a decisive step in the further development of process management. After adding intelligence, not only control but also pump protection and condition monitoring on the same variable frequency drive platform.

Despite its energy-saving and operational advantages, the factory faces many obstacles when it comes to implementing new technologies that increase efficiency in motor-driven pumping systems. This is primarily due to the lack of knowledge of managers, engineers, and distributors of new technologies and solutions to improve the performance of the pump system.

After learning about new technologies, taking risks by changing the long-established production practices often delays decision-making and project execution. In addition, inefficient staffing in the maintenance, production and engineering departments also limits the evaluation and application of new technologies. Given these constraints, there is a general perception in the factory sector that "do not change if the equipment is not damaged."

On the other hand, there are also supplier-side factors that have contradictory motives for improving system efficiency and implementation. For example, pump distributors are more willing to sell more pumps to meet the growing needs of their customers, rather than to advise customers on how to meet increased production through more efficient pump operations. Interestingly, many end-users are willing to continue making purchase decisions based on their original investment , even as distributors discover opportunities and explain potential benefits, rather than investing more to achieve long-term savings.

In order to be able to get the many benefits of pump system optimization, end users, manufacturers and distributors, as well as design engineers, must work together. A comprehensive assessment at the plant level provides an effective way to justify projects to identify the best opportunities for improvement. Once implemented, a better application will be discovered, which provides a stable development channel for major projects to achieve the goal of sustainable development.

The manual nozzle with flowmeteris composed of Counter, metering chamber and main body etc. three parts. Among them, the electronic digital displayer is composed of magnetic coupler, accumulation indicator and zero-resetting device etc. mechanism. The metering chamber is composed of core rack, impeller, worm wheel and worm. The main body is composed of meter shell, oil inlet and outlet tank and valve mechanism etc.

Grasp firmly the bending handle. When the valve opens, the liquid will pass through the oil tank and flow into the metering chamber, and under the action of liquid, the impeller will produce torque to rotate. The rotation speed of impeller will be reduced by worm wheel, worm and gear, and driven by the magnetic coupler, the electronic digital displayer will carry out calculation, so that the volume quantity of liquid passing through the pipe can be read out.
Hot Selling and High Quality Fuel Dispenser Automatic Nozzle,Automatic Fuel Nozzle

Hot Selling and High Quality Fuel Dispenser Automatic Nozzle,Automatic Fuel Nozzle

Welcome to purchase, your choice

Automatic Nozzle

A3003 Automatic Nozzle, YDJ Mobile Fuel Unit, Mechanical Rotation Counter

Shanghai Jiasong Machine Co., Ltd , http://www.fuel-dispenser-parts.com

How to Plant a Kind of Chinese Cabbage Leaf Type Cabbage

Qingmao Leaf Chinese Cabbage is a type of Chinese cabbage native to the coastal area of ​​Tianjin, which was selected and cultivated by local farmers for several hundred years. Due to the fact that it is located at the intersection of marine and continental climates, the climate is variable and the soil salinity is high. Therefore, the varieties bred under this condition have strong adaptability to adverse climatic conditions and soil conditions, forming resistance and The characteristics of strong disease resistance, especially the resistance to dry heart disease are abnormally prominent; from the appearance point of view, the leaves of the Chinese cabbage leaves of Qingmao leaf are wrinkled in a walnut pattern, the photosynthetic area is enlarged, and the leaf color is dark green and chlorophyll content. High, increased photosynthetic efficiency, the ball rim is emerald and helps thin, leaf ball appearance, good merchandise.

The Tianjin Kerun Vegetable Research Institute has carried out special research on Qingmao leaf and Chinese cabbage since the 1970s, and has successively developed "Jinqing series", "Autumn green series", "Jinbai series" and "Jinbai series" of different sizes of young leaves. More than 10 hybrid generations, such as the Jinqiu series, are more resistant to diseases and more ballistic than conventional conventional ones, have better product consistency and commercial quality, and have higher yields, but have been affected by greenhouses in recent years. As a result of the effects, the global temperature has been increasing year by year, and the warm winter has become more and more frequent, which has had a great impact on the production of Chinese cabbage in autumn, especially the determination of suitable sowing dates.In the face of the new situation, new cultivation techniques must be adopted:

First, choose the appropriate variety

The varieties suitable for autumn sowing in straight-barreled young leaves include the Qiu 78, Jinqiu 1, Qiulv 75 and Qiulv 80 with growth periods of 75-80 days, and the autumn green 60 and autumn green with the growing period of 55-65 days. 55. Tsukikura 65, Tsukihachi 606 and Tsubasa 56 and Tsugaru 45 with a fertility period of about 45 days. The specific selection of which variety depends on the purpose of the grower. If a large vegetable or a winter storage dish or a transported vegetable is needed, a variety with a growth period of 75 to 80 days can be used; if a small vegetable, a morning market, or a fore crop is needed Late, late evening, late growth period, etc. can choose the reproductive period of 55 to 65 days or about 45 days of the species; if you need to help white dishes can be selected Jin Bai 56 and Tianjin White 45.

Second, select the appropriate sowing time

The temperature requirement for the whole growing period of autumn sowing Chinese cabbage is gradually decreasing from high to low. The higher temperature at the early stage (about 25°C per day) is conducive to germination, emergence and strong seedlings. The slight decrease in temperature during the rosette period (about 20°C per day) is beneficial to the formation of rosette leaves (functional leaves). The need for cooler temperatures, but also requires a certain temperature difference between day and night (daytime 20 °C ~ 23 °C, night 10 °C ~ 15 °C), is conducive to leaf ball expansion and compaction. Therefore, proper sowing is an important part of autumn sowing cabbage. Premature sowing, a long time in the high temperature period is not conducive to the ball, easy to appear deformed, scattered trees, the wrong heart and other phenomena, in addition, the high temperature can easily lead to serious pests and diseases, affecting yield and quality; too late sowing due to accumulated temperature is not enough, The growth rate is too slow to form a normal ball. The principle of determining the appropriate sowing date includes two aspects, one is the characteristics of the selected species and the other is the purpose of planting.

For the characteristics of varieties, the growth period of the selected species is mainly considered. The varieties with long growth stages have strict requirements for the sowing date. For example, it is 75-80 days of Jinqiu 78. It is advisable to sow on August 12-15, which is based on The purpose of planting is to determine the specific planting date. If fresh vegetables are to be marketed or brought to the market for early sowing, if they are to be stored and then put on the market, they can be sowed in an appropriate manner to reduce disease and facilitate storage. Variety of suitable short-growing period of sowing a wide range of fields, such as 60 days of autumn green 60 in August 8 to 25 can be planted in this range and then determine the specific sowing date according to the purpose of planting, if in order to be listed on the National Day It can be planted on August 8th. If you want to go to the market at night, go to market, reduce the disease, and use less pesticide to sow late; if you want to use it as a big vegetable and store it, you can sow it before and after August 14th. Gain more harvest because the suitable harvest period of Qiu Lu 60 is longer, that is, it matures when it grows to 60 days or so, and it can be harvested. If it is not collected, the leaf ball can continue to grow, and the yield is higher.

Third, the election and preparation

The selected land should be selected to contain more organic matter and fertile soil, and it is necessary to keep water strong and to facilitate drainage. The key is not to link crops with cruciferous vegetables to reduce the invasion of diseases and insect pests.

Before the site preparation, adequate base fertilizer should be applied, especially for planting medium and late-maturing varieties with large trees. The growth period is longer and the amount of fertilizer required is large. Attention should be paid to the application of base fertilizer. In general, good quality manure or compost 3000 to 4000 kg and superphosphate 300 kg can be used per acre, and the two can be mixed and used as a base fertilizer and applied to the soil.

In some areas along the coast of Tianjin and Hebei, due to the high saline-alkali content in the soil, it should be cultivated in flat hoe. In non-alkaline areas, small high ridges can be planted on top of high ridges to facilitate drainage and prevent soft rot.

Fourth, sowing

The sowing methods of different varieties are basically the same. The live broadcast method is used in most of the autumn sowing seasons, because the live broadcasting method is simple and easy to grasp, and labor and labor are saved. The live broadcast is divided into seed drilling and hole sowing. Compared with the seedlings, sowing seedlings can save seeds, and the workload of seedlings and plantings during seedlings is reduced. However, special attention must be paid when sowing seedlings. Therefore, in the case of adequate seeds, most of the drill method.

V. Saplings and trees

Generally sowing seedlings after sowing, the seedlings are more dense, small seedlings are too dense, crowded easily lead to leggy, so that the seedlings are weak, affecting the normal growth in the later period, which affects the yield, and therefore time and seedlings and fixed trees. Usually in the pull cross period and 4 to 5 true leaves during the seedlings 2 times, set in the 7 to 8 leaf period, plant spacing varies from species to species, late mature trees about 40 cm, early-maturing small trees about 33 cm. When setting trees, extra attention should be paid to removing weak seedlings, diseased seedlings and hybrid seedlings. In the absence of seedlings and ridges, seedlings should be promptly filled. After the trees were established, weeding and weeding were carried out immediately.

Sixth, fertilizer and water management

1. Fertilization. The fast-growing fertilizer in the rosette stage ensures the rapid growth of functional leaves, mainly urea, ammonium sulfate or diammonium phosphate, with an application rate of 15 to 20 kg/mu; the quick-improving fertilizer can be used to ensure the rapid growth of leaf bulbs during the ball-forming period. Demand, respectively, in the early stage of the ball and the middle of the ball, respectively, topdressing nitrogen fertilizer (urea or ammonium sulfate), the amount of 20 kg / acre, each time after fertilization should be timely watering.

2. Watering. Sewage water before sowing to ensure the emergence of seedlings and seedlings need to grow; seedlings should be little water pouring to ensure that the micro-climate environment conducive to the cultivation of strong seedlings; lotus seedlings appropriate to promote the roots to the depth of development; watering season should be sufficient In order to ensure the rapid growth of the leaf ball; for the winter storage dish to stop watering 7-8 days before harvest.

VII. Pest Control

The main diseases of Chinese cabbage in Jin and Shu area include downy mildew, soft rot, viral disease and brown rot. The main pests include roundworm, cabbage caterpillar, and diamondback moth. Chinese cabbage leaf type cabbages all have strong resistance to disease. If appropriate late sowing is adopted to avoid disease cultivation, and strong water and water management are used to cultivate strong seedlings and strong trees, the occurrence of diseases is extremely light or even non-pathogenic, so the appropriate sowing date is selected. And to strengthen the cultivation and management of each growth stage is the key to disease prevention; besides, observing the appearance of fields at any time, discovering the conditions and pests timely treatment, and eradicating the diseases and insect pests in the bud, can minimize the damage of pests and diseases, and at the same time reduce The amount of pesticides reduces production costs.

classification The editor 1, the disc sanding Disc sanding sanding, sanding, grinding wheel, also called windmill advantage is alien sanding can usually; Defect is the difference in heat dissipation performance bonding, low efficiency of sanding. Disc sanding machine, grinder, Angle Grinder, grinding machine Disc sanding machine, grinder, angle grinder, grinding machine (6) A, a large "desktop windmill sanding machine", but due to the low efficiency of sanding, replace emery cloth is not convenient, poor operation, so using less and less. B, small are: electric grinder, pneumatic grinder, electric hand wheel, hand wheel, electric electric grinding, starting electric grinding, bench grinder, etc., these small sanding polishing equipment, because of small size, easy to carry, easy to operate, widely used in all walks of life. But the efficiency is low. 2, belt sanding Belt sanding and abrasive belt sanding, the advantage is good heat dissipation, high luminous efficiency, widely used, suitable for sand light plane and compare rules, but in different

Orbital Sander

orbital sander, electric sander,

ZHE JIANG ULITE TOOLS MANUFACTURE CO.,LTD , http://www.ulitepowertool.com

Micropumps using piezoelectric components come out

Star Micronics has developed two new diaphragm type micropumps that use piezo-electric elements. Scheduled from the second half of July 2006 sample supply. The newly developed micro-pump for the maximum flow rate of 2mL / min "SDMP302" and the maximum flow rate of 7mL / min "SDMPP306." Equivalent to the 2005 release of "SDMP301" and "SDMP305" follow-up models. For small fuel cell fuel supply pumps and analytical instruments such as liquid pump.

Miniature pumps using piezoelectric elements feature less power consumption, noise and electromagnetic interference because they do not use motors and shafts (see our site report). The new version of the micro-pump redesigned the internal structure, diaphragm and valve parts have been improved, resulting in increased flow, self-absorption capacity and the mixed liquid delivery capacity of the bubble. Miniature pump installation method also changed from the screw fixed to the adhesive. As a result, the horizontal width at installation is reduced by 10.8mm.

The company has also developed a USB controller "MPU-200" that controls the micropump from a PC preloaded with Windows. In addition to application-specific software, the company is equipped with "EXCEL VBA" and measurement and control application development software "NI LabVIEW" to build a system that combines a micropump with PC, metrology and analytical instrumentation .

Flexible Air Duct

Pvc Flexible Vent Duct,Pvc Flexible Hose,Pvc Flexible Duct

Husan Air Conditioning Equipment Co., Ltd. , http://www.air-louvers.com