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Automatic testing system and method for water pump net positive suction head

An automatic test system and NPSH technology, which is applied in pump test, machine/engine, liquid variable capacity machinery, etc., can solve the problems of large test error, high labor intensity, low efficiency, etc., to reduce labor intensity, Effects of improving working environment, improving test efficiency and test accuracy

Active Publication Date: 2017-07-21
GUANGDONG KENFLO PUMP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of large test error, low efficiency and high labor intensity in the existing water pump cavitation test, thereby improving the accuracy and automation of the test

Method used

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  • Automatic testing system and method for water pump net positive suction head
  • Automatic testing system and method for water pump net positive suction head
  • Automatic testing system and method for water pump net positive suction head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like figure 1 As shown, a water pump NPSH automatic testing system, which includes the following components:

[0037] (1) The discharge tank 1, the water storage tank 2, and the flow regulation pipeline 3 connecting the discharge tank 1 and the water storage tank 2. The flow regulation pipeline 3 is sequentially installed with an electric gate valve 301, a flow meter 302, and a pneumatic regulation valve 303 . The main function of the electric gate valve 301 is to cut off the water flow in the flow regulating pipeline 3 when the pipeline or instrument needs to be repaired. The flow meter 302 is used to measure the flow rate of the water pump 10 under test. The pneumatic regulating valve 303 is used to regulate the water flow in the flow regulating pipeline 3 . A temperature transmitter 201 is also installed on the water storage tank 2 to measure the liquid temperature in real time.

[0038] (2) The air extraction tank 4 installed on the water storage tank 2, the air...

Embodiment 2

[0046] Embodiment 2 relates to a method for testing the NPSH of a water pump, that is, the method part of the present invention. Generally speaking, before the pump cavitation test, the pump performance test (referred to as performance test) has been carried out first, and a set of flow and head data can be obtained through the performance test. During the cavitation test, the flow and head data can be fitted into a flow-head curve Q-H by a polynomial, and the curve can be shifted down by 3% along the vertical coordinate (that is, each point on the curve corresponds to the coordinate system). The height value H drops by 3%), and the cavitation test judgment reference curve Q-H is obtained. 3. In addition, during the performance test, a set of flow and valve opening data will be obtained, that is, each target flow value corresponds to a valve opening value. These data are also useful for cavitation tests. In a word, the present invention makes full use of the performance test...

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Abstract

The invention discloses an automatic testing system and method for the water pump net positive suction head. The automatic testing system comprises a discharging tank, a water storage tank, a flow adjusting pipeline connecting the discharging tank with the water storage tank, an air extraction tank arranged on the water storage tank, a vacuum pump, an air extraction pipeline, a branch pipeline of the air extraction pipeline, a motor, a water inlet pipeline, a water outlet pipeline, and a measurement and control cabinet, wherein the flow adjusting pipeline is provided with an electric gate valve, a flow meter and a pneumatic adjusting valve. The vacuum pump communicates with the air extraction tank through the air extraction pipeline, and the air extraction pipeline is provided with a switch valve. The motor is electrically connected with the vacuum pump. The water inlet pipeline is provided with an electric gate valve and a pressure transmitter and communicates with a water inlet of a tested water pump. The water outlet pipeline communicates with a water outlet of the tested water pump and is provided with an electric gate valve, a pressure transmitter and a switch valve. The measurement and control cabinet integrates a data collecting module and a data control module, is connected with the electric gate valves, the pressure transmitters and other components through signal lines and is further provided with a network output interface used for communicating with an industrial personal computer provided with testing programs. By means of the automatic testing system and method for the water pump net positive suction head, the water pump net positive suction head can be automatically, rapidly and accurately tested.

Description

technical field [0001] The invention belongs to the technical field of water pump testing, and in particular relates to an automatic testing system for NPSH of a water pump and a method thereof. Background technique [0002] Pump NPSH test is one of the basic tasks of pump performance test and an important part of the entire pump production process. During the working process of the pump, cavitation is often caused by the drop of the local pressure of the fluid in the pump, which will damage the pump components and even the pump casing. obtained by theoretical calculation. [0003] At present, most of the water pump cavitation test tests are done by adjusting the valve installed on the water inlet pipeline to gradually reduce the inlet pressure value of the pump, and at the same time adjust the valve installed on the water outlet pipeline to keep the flow constant. The corrosion test is over. In the whole test process, two parameters, inlet pressure and flow rate, need to...

Claims

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Application Information

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IPC IPC(8): F04B51/00
CPCF04B51/00
Inventor 林彦英区国惟叶志标张展发易亚军
Owner GUANGDONG KENFLO PUMP CO LTD
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