A low-noise canned pump with an axial force balance tube structure

Abstract

The invention discloses a low-noise shielded pump with an axial force balance pipe structure, which includes a rotor part, a circulation pipe, a balance pipe, and a partition plate. The rotor part passes through the pump body, the pump cover, the motor casing and passes Bearings are used for rotatable support, and the pump body, pump cover, and motor casing are fixed by fasteners. Through holes are opened on the rear wall of the motor casing and the side wall of the outlet end of the pump body, and are connected by circulation pipes. The rotor components include the main shaft, impeller and balance assembly. The main shaft is installed on the central axis of the pump body, pump cover and motor casing through bearing support. The impeller is installed on the main shaft and located in the pump body. The balance assembly is installed on the main shaft and located in the motor. In the casing, a stationary partition plate is installed in the motor casing. The partition disk and the balance assembly overlap in the axial direction of the main shaft and divide the motor casing into two areas, one of which is connected to the outlet of the pump body through a circulation pipe. The other area is connected to the inlet port of the pump body through the balance pipe.

Description

technical field [0001] The invention relates to the field of canned pumps, in particular to a low-noise canned pump with an axial force balance pipe structure. Background technique [0002] Canned pump is a kind of centrifugal pump, which is often used to transport high-risk, toxic and harmful media, because these media need to be completely leak-free in the conveying device. Conventional centrifugal pumps need to connect the main shaft through couplings and other components due to the external motor. Therefore, there must be a dynamic seal, and even if the dynamic seal is an advanced mechanical seal, it cannot be completely leak-free. The canned pump has a built-in motor, so there is no dynamic seal, and the rest of the static seals can achieve zero leakage when it is not ultra-high pressure, so that the canned pump is completely leak-free. [0003] As the canned pump needs to drain the liquid into the motor, its bearings often use graphite sliding bearings. Due to the axi...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the axial force is usually balanced by opening a balance hole on the impeller. The opening of the balance hole leads to large leakage in the high and low pressure area, which affects the pump efficiency, and the balance is not perfect. There is no corresponding structure for balance and reset, and it all depends on the hard resistance of the bearing, which further reduces the life of the sliding bearing

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