Shielded pump safety monitoring and protection devices

Shielding pump safety monitoring and protection devices To improve the service life and operational safety, shielding pumps are usually equipped with the following protection. (1) Bearing Wear Monitor Bearing wear monitor is usually divided into mechanical, mechanical and electrical, electrical, electronic and other types according to its detection principle. When the shielded pump is running, it can monitor the running condition of the bearing at any time through the bearing wear monitor. When the bearing wear is large, it is necessary to stop or repair the bearing or replace the bearing. If the bearing is damaged during operation, stop immediately. Mechanical monitoring bearing wear the most direct, high reliability, but not adjustable, there is no warning function. Other forms of bearing monitoring, can achieve on-site display, and can output 4 ~ 20mA signal and alarm switch signal. Figure 2-15 shows the common type shield pump bearing wear monitor is electronic. (2) current protection shield pump in the absence of fluid empty running, it will cause the pump damage. When the flow dropped significantly shielded pump structure (1) hydraulic components shielded pump hydraulic components can be used with the same type of sealed pump. Can be used to seal the hydraulic pump motor and shielded motor shield to form a combination of general centrifugal pump impeller, volute and out of El flange structure used in the shield pump. (2) Bearing Due to the rotor is longer, the shield pump needs two sliding bearings before and after. These two bearings require accurate alignment. If poor alignment, the bearings are very easy to crack. Shielded pump sliding bearings are used liquid lubrication. In order to facilitate the liquid lubrication, the inner wall of the sliding bearing and the end surface in contact with the thrust plate are generally provided with diversion grooves. According to the distribution shape of the diversion grooves, the diversion grooves of the normally open perimeter of the shielding pump are straight grooves, spiral grooves or straight grooves And spiral groove. Common sliding bearing materials are as follows: ① graphite graphite material is relatively soft, and has very good self-lubricating. In order to improve its wear resistance, graphite impregnation is usually done, there are common impregnated resin and impregnated metal and other forms. Graphite sliding bearings and surface surfacing tungsten, chromium, cobalt and other hard alloy or plasma-sprayed silicon nitride sleeve made of a class of hard alloy friction pair, the service life of up to one year. ② silicon carbide silicon carbide bearing capacity, wear resistance, high hardness, but also a very good sliding bearing material. If used in good condition, pure sintered a-grade silicon carbide sliding bearings life of up to three years. ③ filled with PTFE in the delivery of some highly corrosive media, the sliding bearings can also use PTFE, the current will be greatly reduced, this time the current protector can send a control signal through the user's protection device will be Pump stopped running to prevent accidents. Similarly, when the load is too large, the current increases more, the current protector will act automatically cut off the current, the motor stops running to prevent accidents. (3) Motor over-temperature protection Pre-embedded temperature sensor in the stator three-phase winding to achieve over-temperature alarm, to avoid the motor winding temperature exceeds its insulation level requirements, at the same time is to meet the explosion-proof performance of a temperature group supplement. The sensor is divided into three main types: thermistors (PTC), thermal switches and thermal resistance (such as PT100), the first two low prices, the use of more extensive. Temperature switches and thermistors are bit-controlled, alarm temperature is not adjustable, and the thermal resistance sensor through the corresponding display instrument, you can real-time monitoring of the motor winding temperature changes, which are usually used in important pump position and special winding form . In addition to the above three kinds of protection devices, the shield pump can also configure the heat exchange capacity monitor, liquid level monitor or within the motor with internal pressure protector, etc., in order to meet the needs of different uses shield pump safety protection.

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