Vertical multistage pipeline centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses a vertical multistage pipeline centrifugal pump. The vertical multistage pipeline centrifugal pump comprises a pump body, a water inlet seat is fixedly mounted at the bottom of the pump body, a base is fixedly mounted at the bottom of the water inlet seat, a water outlet is formed in one side of the top of the pump body, a water inlet is formed in one side of the water inlet seat, a connecting frame is fixedly connected to the top of the pump body, and a motor is fixedly mounted at the top of the connecting frame. A transmission shaft is movably mounted in the middle of an inner cavity of the pump body, a water storage ring groove is formed in the top of the base, a supporting frame is fixedly mounted on the side, close to the water inlet, of the water storage ring groove, and a pressure adjusting device movably sleeves the top of the supporting frame. A flow guide rotating wheel is fixedly mounted at the position, located at the bottom of a first-stage impeller, of an outer ring of the transmission shaft, a movable groove is formed in the side, close to the water inlet, of the interior of the water inlet seat, the pressure adjusting device is arranged at the water inlet position in the pump body, water pressure control over water inlet and water outlet is achieved, the cavitation condition is avoided, and the service life of the water pump is prolonged.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to a vertical multistage pipeline centrifugal pump. Background technique [0002] Centrifugal pump is a very commonly used equipment for transporting liquid medium. It uses the motor to drive the impeller to rotate at high speed. Separated to play the role of pumping liquid, the multi-stage centrifugal pump adopts the superposition of multiple impeller structures, so that the energy of the liquid thrown out by each impeller can be increased to have greater kinetic energy, and the dust will become larger. Larger, the existing vertical multistage centrifugal pump has been widely welcomed because of its high efficiency, energy saving and wide application range, but it still has certain problems: [0003] The centrifugal pump is in the water when it is in use. The impeller rotates to form a certain vacuum at the bottom of the pump body to suck the external water into the pump...

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Problems solved by technology

[0003] The centrifugal pump is in the water when it is in use. The impeller rotates to form a certain vacuum at the bottom of the pump body to suck the external water into the pump body. Under the external water pressure and the suction force inside the pump body, the water entering the pump body has a certain pressure. After entering the impeller, it will encounter a relatively high pressure, so if the pressure at the water inlet of the pump body is too small and the pressure at the subsequent impeller becomes too high, cavitation will easily occur. That is, after the vaporization of liquid occurs at low pressure, the bubbles burst at high pressure and release high-pressure energy, which will erode the metal surface, resulting in serious loss of impeller parts, greatly reducing its service life, and at the same time cavitation It will also cause interference and damage to the energy exchange inside the pump; when the centrifugal pump is working, different water pressures will be formed at the water inlet due to the different pumping speed and volume required. Cavitation is formed at the water inlet. At the same time, because the water inlet is on one side, the use of low-pressure water inlet will cause large changes in water flow on one side and large friction loss, which is not conducive to the long-term use of the pump.

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