High-precision water pump model experiment device

Abstract

The invention relates to a high-precision water pump model experiment device. The high-precision water pump model experiment device comprises a water inlet segment, a pump segment, a tail water segment and an elbow segment which are assembled together in order, the pump segment comprises an impeller mechanism and a guide blade mechanism, an impeller is installed at one end of a pump shaft and is rotatably supported inside an impeller outer pipe through the pump shaft, the other end of the pump shaft stretches out after running through the elbow segment, a guide blade core pipe is arranged on the periphery of the pump shaft in a sleeving manner and does not make contact with the pump shaft, a guide blade is fixed to the periphery of the guide blade core pipe in an integrated manner, the periphery of the guide blade is fixedly connected with the inner wall of a guide blade outer cone pipe, a tail water cone is a semioval shell body and is arranged on the periphery of the part, located inside a tail water outer cone pipe, of the pump shaft in a sleeving manner and has a gap to the pump shaft, the open end of the tail water cone is fixedly connected with the guide blade core pipe, anda shaft protection pipe is arranged on the periphery of the pump shaft in a sleeving manner at the tail water segment position in the outlet direction. The high-precision water pump model experiment device is compact in structure and high in experiment precision, the possible blade shape distortion in machining of important components of the experiment device is effectively avoided, the adverse effect of high speed running of the pump shaft on the flow state is eliminated, and the high-precision water pump model experiment device can be applied to the high-precision hydraulic performance modelexperiment.

Description

technical field [0001] The invention relates to a fluid mechanical device, in particular to a water pump model experimental device with compact structure and high experimental precision. Background technique [0002] Due to the huge size and high processing cost of the water pump device in practical application, it is often difficult to carry out the experiment of the prototype pump device. Generally, the prototype pump device is scaled down to make a model pump device and then the experiment is carried out. According to the obtained model pump device experiment The results are converted to the relevant data of the prototype pump unit by the given formula. [0003] As an indispensable means in the design of fluid machinery, the water pump model experiment device has been widely used. However, due to some problems in the design, processing and measurement of the experimental device, the experimental accuracy of the experimental device is not high, and there is a large deviat...

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Problems solved by technology

However, due to some problems in the design, processing and measurement of the experimental device, the experimental accuracy of the experimental device is not high, and there is a large deviation from the observation results of the prototype pump device.

[0004] The guide vanes of the existing water pump model experimental devices mostly use separate processing of the core tube, blade body and guide vane outer cone tube, and then weld the blade body between the core tube and the guide vane outer cone tube separately. This processing method not only has a large workload , the processing is cumbersome, and it is difficult to ensure the accuracy and smoothness of the flow channel area; since the high-speed transmission shaft passes through the fluid area, it will inevitably cause disturbance to the fluid, which will change the flow state to a certain extent; for devices with outlet elbows , the traditional pressure measurement point takes the position twice the diameter of the elbow outlet, which cannot ignore the influence of the hydraulic loss of the elbow, which affects the measurement accuracy of the flow parameters of the pump section

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