Screw pump working principle, operation and maintenance

1. Working principle of a brief description Screw pump is a unique structure of the volume pump, mainly by the drive motor and reducer, even the shaft and connecting rod box, stator and rotor and other components. When the rotor is driven by a motor, the planet rotates in the stator. The cooperating rotor and the elastic bushing of the stator form several non-communicating sealed cavities. Due to the rotation of the rotor, the sealed cavity is axially moved from the suction end to the discharge end, and the medium is continuously delivered from the suction end to the discharge end within the cavity.
2. Operate the pump before starting the operation, the suction and discharge valve all open;
1) For the first time to start the pump or to use the long-term sealed pump again, inject the supplied fluid and rotate the pump shaft a few times with the aid of the tool so that the stator will not be damaged. Pump can not be no liquid start, no liquid start will damage the stator;
2) Start the motor a moment, check the direction of rotation of the pump to confirm the direction of the pump casing consistent with the standard before the start of operation;
3) Start the pump, observe the pressure gauge and vacuum gauge readings to meet the requirements, pay attention to pump sound, vibration and other operating conditions and found that abnormalities should immediately stop inspection 4) During the initial start-up process, packing seal (especially poly four Fluoroethylene) The initial allowable leakage, the initial start-up process in 15 minutes, should be evenly adjusted nut. Each about 1/8 turn, adjust to the minimum leakage. If the stuffing box temperature rises sharply, the amount of leakage drastically reduced, the nut should be released immediately, repeat the above process;
5) The pump is in normal operation, by controlling the speed to control the flow;
3.Maintenance and Maintenance 1) Before the screw pump is started for the first time, it should clean the sump, inlet pipelines, etc. to prevent the stones, cement blocks and other metal articles falling from the construction from entering the crusher or the pump. Usually open before the start of the import and export should open the valve and confirm the patency of the pipeline before the action can be on the pump running in the patrol should pay attention to whether the bolts loose, pump and pipeline vibration is excessive, the drip in the filler parts in the normal Range, bearing and reducer temperature is too high, the operation of any abnormal sound.
2) As a screw pump, the medium it conveys also plays a role of cooling and lubricating the rotor in the pump. Therefore, idling is not allowed, otherwise the stator and the rotor may be damaged due to friction and heat. Prior to the initial use of the pump inject a fluid medium or a lubricating fluid, such as an aqueous solution of glycerin or diluted water glass, Detergent , etc., into the suction side of the pump to prevent the pump from rubbing during the initial start-up. In the sewage treatment industry, it sometimes happens that large quantities of impurities (such as bags, etc.) in the sludge or dross clog the intake pipe. The appearance of these various phenomena should be avoided during the day. Such as accidental such cases should immediately stop the pump clean to protect the safe operation of the pump.
3). Pump and motor installation accuracy or not, is the first pump to balance the operation of the primary conditions. Although the pump has been accurately set at the factory, but the base is not properly fixed installation will cause the base to distort, causing the coaxial tolerance. Therefore, before the first operation, or after overhaul should verify its concentricity.
4) Bolts on the base bolts and pumps.
During operation, loosening of the base bolt will cause the body vibration, pump body movement, pipeline rupture and so on. Therefore, the regular fastening of the base bolt is very necessary, so should the bolts on the pump body. In the work should always check the motor and reducer, between the reducer and the suction chamber and between the suction chamber and the stator is firm between the bolts.
5). Universal joints or flexible joints bolts.
Although the bolt manufacturers have a variety of anti-loose bolts on these measures, but due to greater vibration during operation, there may be a loosening of the bolt, once the universal joint or flexible shaft off, the pump will cause further Damage, so every 300 ~ 500h operation, the pump should be opened to inspect the bolts here, tighten, and clean the universal joint or flexible shaft winding.
6) When the stuffing box is in normal operation, the stuffing box will be filled with the same stuffing box as the stuffing box of the centrifugal pump. There will be some dripping water, which will play a lubrication role between the stuffing and the shaft to reduce the abrasion of the shaft or sleeve. Normal drip should be about 50 to 150 drops per minute, if more than this number should not bolt. If it still does not work, it should be replaced in time. When the screw pump to transport primary sedimentation tank sludge or digestion of sludge, the drip filling box should be the main exudation of sludge in the sludge, if there is a very thick sludge leakage, even if the number is small, there will be some Sand entering between the shaft and packing accelerates shaft wear.
When using a packing ring with cooling, the cooling water should be kept clear and clean.
7) try to avoid too much mud into the screw pump.
8). Screw pump lubrication Screw lubrication section there are three main:
a. Gearbox: The gearbox is generally oil-lubricated. After the running-in phase (200 ~ 500), replace the lubricating oil, and change the oil every 2000 ~ 3000h. Lubricating oil used in the label should be strictly in accordance with the instructions on the label, the specification does not specify the label can be used with good quality heavy-duty gear oil.
b. Rolling bearings within the bearing frame: This part of the general use of grease lubrication, sewage treatment plant mainly for transporting medium temperature, the choice of ordinary calcium-based grease.
c. Coupling: coupling package 1, a brief description of the working principle Screw pump is a unique structure of the volume pump, mainly by the drive motor and reducer, and even the shaft and connecting rod box, stator and rotor and other parts composition. When the rotor is driven by a motor, the planet rotates in the stator. The cooperating rotor and the elastic bushing of the stator form several non-communicating sealed cavities. Due to the rotation of the rotor, the sealed cavity is axially moved from the suction end to the discharge end, and the medium is continuously delivered from the suction end to the discharge end within the cavity.
2, operate the pump operation before starting, the suction and discharge valve all open;
1) For the first time to start the pump or to use the long-term sealed pump again, inject the supplied fluid and rotate the pump shaft a few times with the aid of the tool so that the stator will not be damaged. Pump can not be no liquid start, no liquid start will damage the stator;
2) Start the motor a moment, check the direction of rotation of the pump to confirm the direction of the pump casing consistent with the standard before the start of operation;
3) Start the pump, observe the pressure gauge and vacuum gauge readings to meet the requirements, pay attention to pump sound, vibration and other operating conditions and found that abnormalities should immediately stop inspection 4) During the initial start-up process, packing seal (especially poly four Fluoroethylene) The initial allowable leakage, the initial start-up process in 15 minutes, should be evenly adjusted nut. Each about 1/8 turn, adjust to the minimum leakage. If the stuffing box temperature rises sharply, the amount of leakage drastically reduced, the nut should be released immediately, repeat the above process;
5) The pump is in normal operation, by controlling the speed to control the flow;
3, maintenance and repair 1) Screw pump in the initial start before the set of mud ponds, into the mud line to clean up to prevent the construction of stones, cement blocks and other metal items into the crusher or pump. Usually open before the start of the import and export should open the valve and confirm the patency of the pipeline before the action can be on the pump running in the patrol should pay attention to whether the bolts loose, pump and pipeline vibration is excessive, the drip in the filler parts in the normal Range, bearing and reducer temperature is too high, the operation of any abnormal sound.
2) As a screw pump, the medium it conveys also plays a role of cooling and lubricating the rotor in the pump. Therefore, idling is not allowed, otherwise the stator and the rotor may be damaged due to friction and heat. Prior to the initial use of the pump inject a fluid medium or a lubricating fluid, such as an aqueous solution of glycerin or diluted water glass, detergent, etc., into the suction side of the pump to prevent the pump from rubbing during the initial start-up. In the sewage treatment industry, it sometimes happens that large quantities of impurities (such as bags, etc.) in the sludge or dross clog the intake pipe. The appearance of these various phenomena should be avoided during the day. Such as accidental such cases should immediately stop the pump clean to protect the safe operation of the pump.
3) The exactness of the installation of the pump and motor shaft, is the first condition of the pump to balance operation. Although the pump has been accurately set at the factory, but the base is not properly fixed installation will cause the base to distort, causing the coaxial tolerance. Therefore, before the first operation, or after overhaul should verify its concentricity.
4) bolts on the base bolt and pump everywhere.
During operation, loosening of the base bolt will cause the body vibration, pump body movement, pipeline rupture and so on. Therefore, the regular fastening of the base bolt is very necessary, so should the bolts on the pump body. In the work should always check the motor and reducer, between the reducer and the suction chamber and between the suction chamber and the stator is firm between the bolts.
5) Universal joints or bolts at the flexible connections.
Although the bolt manufacturers have a variety of anti-loose bolts on these measures, but due to greater vibration during operation, there may be a loosening of the bolt, once the universal joint or flexible shaft off, the pump will cause further Damage, so every 300 ~ 500h operation, the pump should be opened to inspect the bolts here, tighten, and clean the universal joint or flexible shaft winding.
6) When the stuffing box is in normal operation, the stuffing box is filled with the same stuffing box as the stuffing box of the centrifugal pump. There will be some dripping water, which will play a lubrication role between the stuffing and the shaft to reduce the wear of the shaft or sleeve. Normal drip should be about 50 to 150 drops per minute, if more than this number should not bolt. If it still does not work, it should be replaced in time. When the screw pump to transport primary sedimentation tank sludge or digestion of sludge, the drip filling box should be the main exudation of sludge in the sludge, if there is a very thick sludge leakage, even if the number is small, there will be some Sand entering between the shaft and packing accelerates shaft wear.
When using a packing ring with cooling, the cooling water should be kept clear and clean.
7) try to avoid too much mud into the screw pump.
8) Screw pump lubrication Screw pump lubrication there are three main parts:
a. Gearbox: The gearbox is generally oil-lubricated. After the running-in phase (200 ~ 500), replace the lubricating oil, and change the oil every 2000 ~ 3000h. Lubricating oil used in the label should be strictly in accordance with the instructions on the label, the specification does not specify the label can be used with good quality heavy-duty gear oil.
b. Rolling bearings within the bearing frame: This part of the general use of grease lubrication, sewage treatment plant mainly for transporting medium temperature, the choice of ordinary calcium-based grease.
c. Coupling: coupling wrapped in a rubber sheath, the use of pin coupling is greased, generally do not need regular replacement of grease, but if there is sheath damage or overhaul, the general use Oil lubrication should be cleaned every 2000h oil change, the transmission of sludge and scum screw pump 68 can be used mechanical oil.
d. The use of flexible oil rod screw pump due to rigid connections at both ends, eliminating the trouble of refueling cleaning.
In the rubber sheath, the use of pin coupling is grease lubrication, generally do not need frequent replacement of grease, but if there jacket damage or overhaul, the general oil lubrication, should be cleaned once every 2000h oil change , The delivery of sludge and scum screw pump 68 can be used mechanical oil.
e. Screw rod pump with flexible rod As the two ends of the rigid connection, eliminating the trouble of refueling and cleaning.

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