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Comprehensive testbed for water pumps

A comprehensive test bench and water pump technology, used in pump testing, liquid variable capacity machinery, machines/engines, etc., can solve the problems of single experimental content, large investment in experimental equipment, and many sets of equipment, and achieve enhanced system and comprehensive Understand, reduce the experimental area, and enhance the effect of teaching

Inactive Publication Date: 2014-07-16
INNER MONGOLIA AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the single-item water pump measuring instrument experiment are: 1) The experimental content is single; 2) It requires a large number of sets of equipment, large investment in experimental equipment, and a large area of ​​the laboratory; 3) Students cannot systematically understand the performance of the pump. Weaken the effect of experimental teaching

Method used

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  • Comprehensive testbed for water pumps
  • Comprehensive testbed for water pumps
  • Comprehensive testbed for water pumps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Basic Performance Test of Centrifugal Pump

[0022] When testing the basic performance curve of the water pump, start the second centrifugal pump 18, the water in the water tank 2 flows through the second water inlet pipe 20 into the second centrifugal pump 18 for pressurization, and then flows back to the water tank 2 through the second water outlet pipe 13 . Use the second water outlet pipe gate valve 12 to adjust the water pump flow rate, the measured value of the second water inlet pipe vacuum pressure gauge 19 and the first centrifugal pump pressure gauge 24 is used to calculate the water pump head H, and the measured value of the power sensor 15 is used to calculate the water pump axial power N , the second centrifugal pump vortex flow sensor 14 is used to measure the flow of the water pump.

[0023] The specific test steps are as follows:

[0024] 1) Before the experiment, first check whether the pointers of the pressure gauges are at zero, move the ...

Embodiment 2

[0045] Embodiment 2: Water pump variable speed performance curve test:

[0046] When testing the speed change performance curve of the water pump, the inverter is used to change the frequency of the power supply to change the speed of the water pump. The connection relationship of other components is the same as the basic performance curve.

Embodiment 3

[0047] Embodiment 3: Water pump cavitation performance experiment:

[0048] When testing the water pump cavitation performance curve, start the first centrifugal pump 22, adjust the gate valve 8 of the first water outlet pipe to a certain opening, and use the vacuum pump 1 connected to the top of the water tank 2 to change the vacuum degree of the water pump inlet. The measured values ​​of the vacuum pressure gauge 6 and the pressure gauge 9 of the first centrifugal pump are used to calculate the head H of the water pump, and the vortex flow sensor 11 of the first centrifugal pump is used to measure the flow of the water pump, and then calculate the NPSH.

[0049] Keep the flow at a certain value within the working range of the pump, and reduce the NPSH by increasing the vacuum at the pump inlet to make it equal to or less than the critical NPSH of the pump, forming pump cavitation. Find the critical NPSH Δhcr at this flow rate, read the readings of the pump inlet vacuum gauge...

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Abstract

The invention relates to a comprehensive testbed for water pumps, and belongs to the field of test experimental apparatuses. Two water inlet pipes are connected with a water tank and first and second water pumps respectively. A vacuum pump is connected to the upper portion of the water tank. Each water inlet pipe is controlled by a sluice valve. Vacuum manometers are mounted on the water inlet pipes. The water pumps are driven by two motors. A manometer and a flowmeter are arranged on a water outlet pipe of each water pump. The two water outlet pipes are combined to a water return pipe. A water current flows back to the water tank through the water return pipe to realize circulation. A power sensor is connected between a second centrifugal-pump motor and one of the water pumps and can measure the power of the second centrifugal-pump motor. By the comprehensive testbed, basic performance experiments, speed change performance experiments, cavitation performance experiments, parallel-series connection combination property experiments and motor efficiency testing experiments of the water pumps can be completed on one piece of equipment, so that the number of experimental equipment as needed and occupied experimental land are reduced, systematic and overall understanding of students on all water pump experiments is enhanced, and experimental teaching effect is improved.

Description

technical field [0001] The invention relates to a water pump comprehensive test bench, which belongs to the field of testing and experimental instruments. Background technique [0002] The water pump performance experiment is an important practical teaching link of the course "Water Pumps and Pumping Stations". Through practical operations, students can understand the basic performance of water pumps, the variable speed performance of water pumps, the cavitation performance of water pumps and their influence on other working performances of water pumps and the performance of water pumps. The relationship between the series and parallel operation performance and the single pump operation performance. [0003] At present, there are few teaching instruments for water pump experiments on the market, and only a few instruments can only meet the needs of a certain experimental content, and there is no comprehensive experimental instrument for water pump experiments that can comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B51/00
Inventor 李超郝中保刘霞李畅游史小红
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY