Small-flow high-delivery-lift submerged multi-stage centrifugal pump

Abstract

The invention relates to a small-flow high-delivery-lift submerged multi-stage centrifugal pump, which is characterized in that a motor base is arranged on a base plate, a motor is arranged on the motor base, a driving shaft is connected with a motor shaft through a shaft coupling, a pump main body is arranged on a gear box, the upper part of the pump main body is connected with a drain pipe, thedrain pipe passes through the base plate and is fixed with the base plate, and the gear box is connected with the base plate through a connecting pipe; and a middle bearing block is connected with anupper connecting pipe, a driving shaft machine sealing cover through bolts, and a driving shaft of a power transmission mechanism penetrates out of a driving gear and is connected with a driving shaft 7 through a middle shaft coupling. The small-flow high-delivery-lift submerged multi-stage centrifugal pump has the advantages that the power transmission mechanism is adopted to solve the difficultproblem of high-pressure sealing leakage and prolong the service life of the pump, the drive ratio of the driving gear to a driven gear in the power transmission mechanism is changed so that the submerged multi-stage pump is applicable to a wider working condition range. The delivery lift of a conventional submerged pump can only reach 2 MPa maximally because of the leakage problem of the pump, but the small-flow high-delivery-lift submerged multi-stage centrifugal pump has no problem of the high-pressure sealing leakage so that the delivery lift range can be enlarged to be 6 MPa.

Description

Small flow high lift submerged multistage centrifugal pump technical field The invention relates to a low-flow, high-lift submerged multistage centrifugal pump suitable for electric power dosing; steel metallurgy descaling; petrochemical feeding, canning; printing and dyeing, textile washing, etc., belonging to the technical field of mechanical pumps. Background technique At present, all kinds of submerged multistage pumps cannot meet the needs of small flow and high head. Moreover, various submerged multistage pumps generally have leakage problems during operation. The traditional method to solve the leakage problem is to install a mechanical seal on the main part of the pump. According to the structural characteristics of various submerged multistage pumps, the mechanical seal It can only be installed in the high-pressure area of ​​the pump outlet. Since the mechanical seal works in the high-pressure area, the pressure requirements on the mechanical seal are relatively h...

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Problems solved by technology

At present, all kinds of submerged multistage pumps cannot meet the needs of small flow and high head

Moreover, various submerged multistage pumps generally have leakage problems during operation. The traditional method to solve the leakage problem is to install a mechanical seal on the main part of the pump. According to the structural characteristics of various submerged multistage pumps, the mechanical seal It can only be installed in the high-pressure area of ​​the pump outlet. Since the mechanical seal works in the high-pressure area, the pressure requirements on the mechanical seal are relatively high, and the service life of the mechanical seal working in the high-pressure area is also short, and the cost of using high-pressure seals is also high.

Therefore, this method cannot completely solve the leakage problem of the pump, resulting in serious damage to other components of the pump due to leakage, which seriously affects the service life of the pump.

The motor shaft and the main shaft of the traditional submerged pump structure are on the same axis, and the mechanical seal is in the high-pressure area of ​​the pump body. The high-pressure seal cannot completely solve the pump leakage problem

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