Self-priming device and method for a pump

Abstract

The invention discloses a self-priming device and a method for a pump, and belongs to the technical field of industrial centrifugal pumps. The device comprises a transmission device, a vacuumizing device, a gas-water separation chamber and a control valve adopted for implementing the method. The invention aims to solve the problem of efficient self-priming water feeding of a centrifugal water pump. The self-priming device and method for the pump can synchronously vacuumize an inlet pipeline of the centrifugal pump and a high-pressure cavity of the pump before pump starting to realize quick air exhausting and pump priming; after the centrifugal pump is started, a suction pipeline is automatically closed to stop the vacuumizing operation; and after the pump is stopped, residual mediums in the vacuumizing device, the high-pressure cavity of the pump and the inlet pipeline are discharged.

Description

technical field [0001] The invention relates to a self-priming device and method for pumps, in particular to a self-priming device and method for industrial centrifugal pumps, belonging to the technical field of industrial centrifugal pumps. Background technique [0002] Usually, the industrial centrifugal pump needs to inject medium into the pump chamber before starting the pump, commonly known as priming pump, otherwise the centrifugal pump cannot start and run normally. One of the traditional pump filling methods is to build a high-level pool and place the pump at a low place to achieve positive pressure in the pump cavity. This method not only has high engineering costs, but also high maintenance costs for the pool. Another common pump filling method is to set a bottom valve at the lowest point of the inlet pipeline, and then start the pump after filling the pump chamber with medium. This method is cumbersome to operate, has a high failure rate, and is difficult to maint...

AI Technical Summary

Problems solved by technology

Vacuum pumps can solve the problem of centrifugal pump filling, but ordinary vacuum pumps have the following disadvantages: 1. High equipment cost and large floor space; 2. Complex operation and heavy maintenance workload; Corrosion of the conveyed medium causes the failure of the vacuum pump; 4. Ordinary vacuum pumps are noisy and pollute the environment

[0006] The disadvantages of the gas-liquid hybrid self-priming pump are: 1. Low pump efficiency and long self-priming time

In order to realize the function of gas-water mixing and gas-water separation in the pump chamber, the gas-liquid hybrid self-priming pump has changed the hydrodynamic model of the pump, and the pump efficiency has been reduced to a certain extent.

2. Small flow range

3. The suction height is low, which means that the vacuuming capacity of the pump is low

4. Cavitation is easy to occur when the pump is working, and the cavitation of the impeller is serious when it is started frequently

The disadvantages of the water ring wheeled self-priming pump are: 1. The structure of the centrifugal pump is changed, and the pump efficiency is low

2. Small flow range

The water ring wheeled self-priming pump is only suitable for small flow and small diameter pumps

3. High manufacturing cost

4. The service life of the pump is short

The disadvantages of this device are: 1. The structure is complex and the failure rate is high

2. There is no medium in the pump cavity when the pump is started, which is not conducive to the use of pump seals

If the auxiliary lubricating device is not used, the seals such as mechanical seals and packing seals are in a dry grinding state; if the auxiliary lubricating device is used, the cost of the equipment will be increased, and the complexity and failure rate of the equipment will be increased.

3. The vibration of the vacuum suction device is large, which seriously affects the service life of the pump main shaft, main shaft bearing, pump support, mechanical seal or packing

4. Loud noise, polluting the environment

5. Difficult maintenance

Regardless of the maintenance of the pump or the vacuum auxiliary mechanism, the centrifugal pump and the vacuum system must be disassembled, which involves many parts and components, cumbersome operation, and high labor intensity.

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