The water ring vacuum pump status quo, development trends and design and development of several views It is well known, due to the water ring vacuum pump and water ring compressor has the advantages of simple structure, easy to use and maintenance, which in all walks of life has been widely used. Especially with the characteristics of isothermal compression, easily sucked, compressed flammable gases. Here to talk about its development and design and development of a few superficial views.
1 large-scale
Due to the development of the coal mine, chemical industry, pharmacy and paper making industries, the demand for water ring vacuum pumps has become more and more large-scale. Before 2000, our country was able to produce only 3-4 enterprises in the water ring vacuum pumps with the pumping volume of more than 100m3 / min. The annual output of the country is only a few dozen or so units. And only three years later, by 2003 the country can produce more than 100m3 / min large pump manufacturers more than 10 (only Zibo area there are 7--8), according to incomplete statistics, the country's large pump Production up to hundreds of units, these products are mainly used in:
(1) Coal mining industry
As the state has stepped up its safety requirements for coal mines, pumping water gas vacuum pumps, especially large-scale water ring vacuum pumps, has become a mandatory safety requirement in the coal mining industry. For example, the number of pumping units ordered by a mining bureau in Shaanxi Province last year was more than 400m3 / min large water ring vacuum pump is used to extract gas, and some large coal mines use more than 100m3 / min up to 7-8 sets of pumps. As the state further strengthens its safety work, large-scale and extra-large water ring vacuum pumps will be more and more widely used in coal mining systems.
In addition, due to the rapid increase of coal production, the vacuum filter used in coal washing and coal preparation also went large-scale development. In the 1980s, most SZ-4 water ring vacuum pumps with a pumping volume of 27 m3 / min It was also larger at that time. In recent years, the coal mine filter are equipped with a large amount of pumping capacity of 80-150m3 / min water ring vacuum pump, and some reached more than 200m3 / min, but also the gas volume continues to increase.
(2) chemical industry
a) Chlor-alkali industry
In recent years, China has launched many large-scale capital construction projects and technological transformation projects. The actual projects of these projects require a large amount of PVC materials, especially real estate, which has further promoted the development of the PVC industry. According to the requirements of the chlor-alkali industry Statistics show that China produced 4.1 million tons of PVC last year and 200 tons of imported materials. According to the forecast of the industry, the national demand in 2005 will reach 8 million tons, and by 2010 it will reach 15 million tons precisely because of the rapid increase in demand, making China's chlor-alkali industry enterprises to expand production expansion and near One or two years a lot of new businesses. Chlor-alkali business development, water and air pumps and water ring compressor must be matched j to pump and compress acetylene and hydrogen water ring vacuum pump and water ring compression
In the past the largest but also 30m3 / min, and now with an annual output of 100,000 tons of caustic soda and 100,000 tons of PVC companies need water ring vacuum pump and water ring compressor up to 70m3 / min.
What needs to be specially introduced here is precisely because of the development of this industry, to promote and speed up the development and production of high I-force water ring compressors.
For a long time, China's water ring compressor is generally when the suction pressure of 1 atm or slightly lower than the pressure, the exclusion of pressure O. 1MPa, that is, the compression ratio is 2, and some enterprises have produced water ring compressors with the pressure up to 25MPaG, and only 1-2 specifications. In order to adapt to the production of polyvinyl chloride, the former major equipment office of the State Council proposed in the "85" major technological equipment research project - the research and development of an equipment with an annual output of 4 tons of low polymerization degree polyvinyl chloride unit Research topics, this recovery of vinyl chloride monomer water ring compressor requires suction pressure at atmospheric pressure or micro negative pressure, the discharge pressure to reach O.55-0.6MPaG, and the displacement to reach 700m3 / min. After several years of hard work, our company passed the technical appraisal organized by the former Ministry of Machinery Industry in December 1996, and the customer technology has reached the key requirements. On the basis of this product, our company has developed a series of products, displacement from 90m3 / min to 2000m. / H. Since this equipment is one of the key equipment in the PVC industry, under the circumstance of the large PVC project in China in recent years, the water ring compressor has been popularized and applied, completely replacing the import.
OUTER RETAINING CAP
This brass cap holds all the consumables onto the torch head.
It should only be replaced if there is visible damage such as slag build-up, dents or burns (on either opening), or if it is difficult to thread onto the torch head.
New Outer Retaining Cap
New
Worn Outer Retaining Cap
Requires Replacement
What`s wrong with this one? The top edge is dented and there is slag build-up on the lip. Both of which could cause the shield cap to not fit properly.
SHIELD CAP
Although the shield cap is not consumed by the plasma arc, due to its close proximity to the work piece it is susceptible to damage from torch crashes and pierces made too close to the plate.
As its name implies, the shield cap funnels the shielding gas for the purpose of additional nozzle cooling and improved cut edge squareness.
The orifice in the shield cap is crucial to edge cut quality, so it should be replaced when it becomes burnt, bent, or otherwise out of round.
An abrasive hand pad (not sand paper) can be used to remove splatter (slag) that has built-up on the shield cap.
Always inspect O-rings for possible damage such as nicks, cracks and tears. Make sure O-rings are properly lubricated using the manufacturer`s recommended lubrication. Refer to the manufacturer`s operator manual for lubrication specifications.
New Shield Cap
New
Worn Shield Cap
Requires Replacement
What`s wrong with this one? While the slag build-up could be removed with an abrasive pad, the orifice is out of round and cannot function effectively.
INNER RETAINING CAP
This piece has a copper body with a pressed-on insulator ring for seating into the shield cap.
The purpose of the inner retaining cap is to circulate coolant around the outside of the nozzle, and to distribute gas to the shield cap through tiny holes in the insulator ring.
This piece is not consumed by the plasma arc and can easily last up to 30 or more electrode replacements.
Replace only if the orifice is burnt, bent, out of round, or if the tiny holes in the copper body or insulator ring are plugged.
New Inner Retaining Cap
New
Worn Inner Retaining Cap
Requires Replacement
What`s wrong with this one? The orifice is out of round and the insulator ring is damaged.
NOZZLE
The copper nozzle channels the swirling plasma arc through a small orifice that varies in diameter depending on the amperage of the consumable. When new, this orifice will be perfectly round with a clearly defined sharp edge. This feature is the key to optimal cut quality.
Under normal cutting conditions, expect to use two nozzles for each electrode to maintain the highest cut quality.
The nozzle should be replaced when the orifice begins to wear out of round on either the outer or the inner bore. There may be some light swirl marks on the inside of the nozzle caused by arc starting, but this is not a cause for replacement.
Always inspect O-rings for possible damage, such as nicks, cracks and tears. Make sure O-rings are properly lubricated using the manufacturer`s recommended lubrication. Refer to the manufacturer`s operator manual for lubrication specifications.
New Copper Nozzle
New
Worn Copper Nozzle
Requires Replacement
What`s wrong with this one? The orifice is too out of round to function effectively and the sharp edge of the orifice has been eroded.
SWIRL RING
The swirl ring is machined from a high temperature resistant material such as Vespel® or ceramic, and is, therefore, not consumed by the plasma arc.
It serves as both an insulator between the electrode and nozzle, and a vessel to create the swirling action of the plasma gas needed to create precision cuts.
Care must be taken to ensure the small holes remain free of dirt and debris, and it should be replaced if any cracks or chips are detected.
Always inspect O-rings for possible damage such as nicks, cracks and tears. Make sure O-rings are properly lubricated using the manufacturer`s recommended lubrication. Refer to the manufacturer`s operator manual for lubrication specifications.
New Swirl Ring
New
Worn Swirl Ring
Requires Replacement
What`s wrong with this one? The small holes are plugged with debris.
ELECTRODE
The electrode can be made of copper or silver, or a combination of both, and contains a separate emitter rod insert, made of either hafnium or tungsten. The emitter rod offers less resistance to current flow than copper, which prevents the electrode from burning up while the high current arc is generated.
As long as the plasma arc is on, the emitter rod is being consumed. Eventually, it will reach a depth which will allow the arc to jump directly to the end of the electrode. This will result in an immediate blow out which will also destroy the nozzle and shield cap, and could also damage the torch head.
New Electrode
New
Worn Electrode
Requires Replacement
What`s wrong with this one? The wear depth (or pit depth) exceeds the allowable limit.
The safety zone for emitter wear depth is approximately 0.040" (1.02mm) for copper electrodes and 0.1" (2.54mm) for silver electrodes.
Always inspect O-rings for possible damage such as nicks, cracks and tears. Make sure O-rings are properly lubricated using the manufacturer`s recommended lubrication. Refer to the manufacturer`s operator manual for lubrication specifications.
Wearing Parts For Plasma Cutting
Wearing Parts For Plasma Cutting,Cutting Torch Wear Parts
Changzhou Edaweld Trading Company Limited , https://www.edaweld.com
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