The main structure of centrifugal multistage pumps

Centrifugal multistage pump is simple a lot of single pump series, together, his output pressure can be very big, is a kind of centrifugal pump, and rely on the rotation of the impeller in the centrifugal force, and material. For gas density to achieve the mechanical vacuum pump was out working range, and thus gradually obtain high vacuum. Centrifugal multistage pump is accomplished by the change of the pump cavity volume of suction, compression and exhaust, so it can be variable capacity centrifugal multistage pumps.

centrifugal multistage pump of the main structure is composed of inlet section, outlet section, middle, end cover, impeller, pump body, water pump shaft, bearing, seal ring, stuffing box and other parts.

1, the impeller is the core part of the multistage pump, its speed is higher than strength, on the impeller blades and play a major role, the impeller through static balancing experiments before assembly. Impeller on the inside and outside for smooth surface to reduce friction loss of water.

2, inlet section, outlet section, the middle is also called the pump shell, it is the body of the multi-stage pump. Support fixed effect, and connected to install bearing bracket.

3, the role of pump shaft is connected by coupling and motor, the torque of the motor to the impeller, so it is a major part of the mechanical energy transfer.

4, bearing is set on the pump shaft support components of pump shaft, which has two kinds of rolling bearing and sliding bearing. Rolling bearing use butter as a lubricant oil is generally appropriate for two-thirds to three-quarters of the volume too much will be fever, too little and there was a noise and fever! Sliding bearing is using a transparent oil as lubricant, go to the oil level line. Too much oil leak to the pump shaft and floating base, too little bearing overheating and burn out cause an accident! In the water pump bearing has the highest temperature during the operation of around 85 degrees generally run at 60 degrees, if high will find reason ( If there are impurities, oil is black, whether water) And processed in a timely manner!

5, sealing ring, also known as minus leakage ring. Import and pump impeller shell gap between the will cause high pressure of water in the pump by means of this clearance flow to the low pressure area, affect the water yield of pump, efficiency! Clearance starts to cause the impeller and pump casing friction wear. In order to increase the flow resistance reducing internal leakage and delay the service life of the impeller and the pump shell, the pump casing and impeller around the foreign aid junction with sealing ring seal clearance in a 0. 25 ~ 1. It is advisable to 10 mm.

6, stuffing box is mainly composed of filler, seal ring, packing, packing gland, water tubes. The role of the stuffing box is mainly in order to close the gap between pump casing and pump shaft, don't let the flow within the pump does not flow outside to not let outside air into the pump. Always keeping the vacuum inside the water pump! When the water pump shaft and be about to rely on water seal packing friction heat to hold water to the water seal circle packing cooling! Keep the pump running. So in the process of pump run Tours of inspection to check the stuffing box is paying special attention to! Running about 600 hours will be carried out on the packing replacement.

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