Vertical multi-stage feed pump

Abstract

The invention discloses a vertical multi-stage feed pump. The vertical multi-stage water feeding pump comprises a base, wherein a pump body is fixedly installed at the upper end of the base, an outercylinder body is fixedly installed at the upper end of the pump body, an inner cylinder body is arranged inside the outer cylinder body, an overflowing channel is formed between the outer cylinder body and the inner cylinder body, a shaft sleeve is arranged at the upper end inside the inner cylinder body, an overflowing opening is formed in the upper end of the outer circle face of the inner cylinder body, a mechanical seal is arranged at the upper end, close to the shaft sleeve, in the inner cylinder body, the outer side of the mechanical seal is sleeved with a conical cylinder protection device, a connecting base is fixedly installed at the upper end of the outer cylinder body, and a limiting device is fixedly installed on the inner surface of the connecting base. According to the vertical multi-stage feed pump, through arranging the conical cylinder protection device, an obliquely-arranged anti-scouring baffle is used for blocking water flow, so that the water flow directly scours the anti-scouring baffle, the mechanical seal is prevented from being directly scoured, abrasion of the mechanical seal is reduced, and then the service life of the mechanical seal is prolonged.

Description

technical field [0001] The invention relates to the technical field of water delivery equipment, in particular to a vertical multi-stage water feed pump. Background technique [0002] Vertical multistage centrifugal pump is a kind of vertical multistage medium conveying equipment. Because of its compact structure, small size, high efficiency, beautiful appearance and small installation area, vertical multistage pump has been widely used in hydraulic conveying field. Widely used, it is one of the important equipment in the process of hydraulic transportation, widely used in ships, airports, cleaning, ultrasonic, printing and dyeing, chemical industry, boilers, water treatment, high-rise building water supply and factory mine water supply and drainage systems, vertical multi-stage centrifugal The pump mainly includes two parts: the pump body and the motor. The bottom of the pump body is provided with a water inlet and outlet section structure. The water inlet and outlet sectio...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that at least the following problems in the prior art have not been solved: 1. In the cold outdoor environment in the north, the water inside the pump body is easily frozen and the normal operation of the pump cannot be guaranteed. At the same time, the existing base is usually integrally cast, which is difficult to manufacture. Since the vertical multistage centrifugal pump is divided into corrosion resistance and high temperature resistance according to the use requirements, the flow-passing parts cannot be selected from suitable materials according to the use requirements; 2. When the vertical multi-stage feed water pump is used in the field of water treatment, because the water contains more impurity particles, and the kinetic energy contained in the water conveyed through the centrifugation to increase the lift is relatively large, the entrained impurity particles will grind the mechanical seal and speed up. The wear of the mechanical seal will shorten the service life of the mechanical seal, and the mechanical seal needs to be in contact with water to form a water film to reduce the friction with the shaft. To isolate from the water, a new structure is required to avoid the direct washing of the mechanical seal by the conveyed water, while maintaining the contact between the conveyed water and the mechanical seal; 3. In the prior art, the multi-stage feedwater pump uses a coupling Realize the connection between the pump shaft and the motor shaft to provide power for the vertical multi-stage pump. The traditional vertical multi-stage pump is a two-piece clamp coupling. The motor shaft and the pump shaft are easy to deviate during the working process, resulting in failure to maintain On the same straight line, poor coaxiality between the motor shaft and the pump shaft will increase the vibration of the pump when it is running, and the vibration of the motor part will also increase. Not only the pump body is easily damaged, but also the motor bearings are easily damaged, reducing the overall service life of the pump.

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