Semi-submersible type hydraulic testing device for vertical and axial suction centrifugal pump

Abstract

The invention relates to the technical field of machines, in particular to a semi-submersible type hydraulic testing device for a vertical and axial suction centrifugal pump. The semi-submersible typehydraulic testing device comprises a testing cylinder, a lifting platform, a water sucking pipeline, an execution motor, adjusting lead screws and a degassing pipe. The water sucking pipeline is arranged on one side of the testing cylinder and connected with the testing cylinder. The water sucking pipeline is further provided with a regulating valve. The lifting platform is provided with adaptorplates, and therefore a pump body to be tested can be conveniently installed on the lifting platform through the adaptor plates. The adjusting lead screws are arranged between the lifting platform andthe adaptor plates, and the position adjustment of the lifting platform in the vertical direction is achieved through the adjusting lead screws. The execution motor is arranged on the water sucking pipeline and connected with the regulating valve. The other side of the testing cylinder is further provided with the degassing pipe. The semi-submersible type hydraulic testing device can adapt to andbe matched with various types of vertical pumps, the universal degree and the application ability of the testing device are improved, and convenience is brought to installation and adjustment of thevertical centrifugal pump in the testing process.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a semi-submersible hydraulic testing device for a vertical axial suction centrifugal pump. Background technique [0002] Vertical axial suction centrifugal water pumps include single-stage or multi-stage pumps. Generally, the pump body has a compact structure and a small footprint. The driving motor of the water pump is usually installed directly on the pump body, or indirectly installed on the pump vertical. above the axis. Under the same rated flow rate, the multistage pump has a discharge pressure equivalent to that of multiple single-stage water pumps, so the axial force that needs to be balanced on the rotor of the multistage vertical pump is relatively large, and the axial force includes self-gravity; most centrifugal The pump has a suction performance item in the hydraulic test. The NPSH of the pump is directly related to the installation height of the pump suction. H...

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Problems solved by technology

Under the same rated flow rate, the multistage pump has a discharge pressure equivalent to that of multiple single-stage water pumps, so the axial force that needs to be balanced on the rotor of the multistage vertical pump is relatively large, and the axial force includes self-gravity; most centrifugal The pump has a suction performance item in the hydraulic test. The NPSH of the pump is directly related to the installation height of the pump suction. However, due to the limitation of the installation center of gravity and the structure of the vertical pump, it is often impossible to directly measure the NPSH. For the suction centrifugal pump group, the size of the rotor installation structure is usually longer, especially the multi-stage vertical pump is more prominent. The device bench used by the pump manufacturer to test the vertical centrifugal water pump has always the installation space in the factory building. There are limitations, and pump test activities mean repeated hoisting operations, which involve a series of factors related to hoisting space, such as various vertical pump structures and types, sizes and hoisting heights, port diameters and positions, and equipment weight and support.

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