阅读说明：本技术 一种水泵寿命可靠性加速测试装置 (Water pump life reliability accelerated testing device ) 是由 黄成勇 李绍华 黄嘉华 于 2021-06-21 设计创作，主要内容包括：本发明公开了一种水泵寿命可靠性加速测试装置,包括受试泵、盛有工质的试验槽、电源激励模块、控制模块、泥沙含量补偿测量模块、温度补偿测温模块、酸碱度监控调节模块、微生物腐殖质/高分子树脂涂料废液粘稠物质发生补偿模块、工质粘度测量模块及扬程可调节模块,受试泵沉入所述试验槽的工质中,受试泵的出水口连接有出水管,出水管的出水端连接有回水管,回水管的出水端与试验槽连接,控制模块与受试泵之间连接着电源激励模块,控制模块通过电源激励模块调节受试泵的电压、频率及电流。本发明能够在不同工况条件下对受试泵进行多因子多水平复合的加速寿命测试,合理地预测出水泵在使用环境中的寿命。(The invention discloses a water pump service life reliability accelerated test device, which comprises a tested pump, a test tank filled with working media, a power supply excitation module, a control module, a silt content compensation measurement module, a temperature compensation temperature measurement module, a pH value monitoring and adjusting module, a microbial humus/high polymer resin coating waste liquid viscous substance generation compensation module, a working medium viscosity measurement module and a lift adjustable module. The invention can carry out multi-factor multi-level composite accelerated life test on the tested pump under different working conditions, and reasonably predict the service life of the water pump in the use environment.)

1. The accelerated testing device for the service life reliability of the water pump is characterized by comprising a tested pump (2), a test tank (1) filled with working media, a power supply excitation module, a control module (13), a sediment content compensation measuring module for controlling and changing the sediment content in the working media, a temperature compensation temperature measuring module for controlling and changing the temperature of the working media, a pH value monitoring and adjusting module for adjusting and monitoring the pH value of the working media, a microbial humus/high-molecular resin coating waste liquid viscous substance generation compensating module for controlling and changing the content level of the microbial humus/high-molecular resin coating waste liquid viscous substance in the working media, a working medium viscosity measuring module for measuring the viscosity value or resistance value of the working media and a lift adjustable module, wherein the tested pump (2) sinks into the working media in the test tank (1), and a water outlet of the tested pump (2) is connected with a water outlet pipe (3), the water outlet end of the water outlet pipe (3) is connected with a water return pipe (4), the water outlet end of the water return pipe (4) is connected with the test tank (1), the test pump (2) sucks working media in the test tank (1) through the water outlet pipe (3) during working, then the working media are pumped back into the test tank (1) through the water return pipe (4), the power supply excitation module is connected between the control module (13) and the test pump (2), and the control module (13) adjusts the voltage, the frequency and the current of the test pump (2) through the power supply excitation module.

2. The accelerated test device for the life reliability of the water pump according to claim 1, characterized in that the test sample size of the pump under test (2) is a natural number and is equal to or greater than three.

3. The accelerated test device for the service life reliability of the water pump according to claim 2, characterized in that a plurality of groups of tested pumps (2) are connected to the power excitation module with the same power frequency characteristic, or each group of tested pumps (2) is connected to one power excitation module with different power frequency characteristics.

4. The accelerated test device for the service life reliability of the water pump according to claim 1, characterized in that the water outlet pipe (3) of the tested pump (2) is provided with a pump switch valve (5), and the water return pipe (4) is provided with a circulating switch valve (6).

5. The accelerated test device for life reliability of a water pump of claim 1, an isolation plate (8) is arranged in the test tank (1), the isolation plate (8) divides the test tank (1) into a first area (9) and a second area (10), and the working medium in the first area (9) is circularly communicated with the working medium in the second area (10), the first area (9) is provided with a variable frequency water pump (11) for homogenizing and dispersing the working water quality, a first circulating water pump and a second circulating water pump are respectively arranged in the first area (9) and the second area (10) and are connected in parallel, and the first circulating water pump and the second circulating water pump respectively comprise at least 3 tested pumps (2) connected in parallel, and the water outlet ends of the first circulating water pump and the second circulating water pump are connected with the water inlet end of the water return pipe (4) through a pipeline.

6. The accelerated test device for the service life reliability of the water pump according to claim 1, characterized in that a water supply pipe is connected to the test tank (1), the outlet end of the water supply pipe is connected to the test tank, and a valve switch (12) is arranged at the outlet end of the water supply pipe.

7. The accelerated test device for the service life reliability of the water pump according to claim 1, wherein the power supply excitation module at least comprises single-type power supply excitation or combined-type power supply excitation, the single-type power supply excitation comprises a single-phase alternating-current variable-frequency power supply or a three-phase alternating-current variable-frequency power supply or a direct-current voltage-stabilizing constant-current power supply, and the combined-type power supply comprises any two or three of the single-phase alternating-current variable-frequency power supply, the three-phase alternating-current variable-frequency power supply and the direct-current voltage-stabilizing constant-current power supply.

8. The accelerated test device for life reliability of a water pump of claim 1, a supporting device for supporting the tested pump (2) is arranged in the test tank (1), the supporting device comprises a supporting plate (15), a vertical plate (16) and a positioning piece (20), wherein the vertical plate (16) is vertically connected with the supporting plate (15), the tested pump (2) is arranged on the supporting plate (15), a vertical guide rail (17) is arranged in the test tank (1), the vertical plate (16) is provided with a guide block (18) which is in sliding fit with the vertical guide rail (17), the vertical guide rail (17) is provided with a guide groove (19) along the vertical direction, the vertical plate (16) is provided with a plurality of adjusting holes corresponding to the position of the guide groove (19), the positioning piece (20) is inserted into the adjusting hole and can be abutted against the guide block (18) to fix the vertical plate (16) at the corresponding position of the adjusting hole.

9. The accelerated test device for life reliability of a water pump of claim 1, the lift adjustable module comprises a water lifting hose (22) connected with the water outlet end of the water outlet pipe (3), a transition pipe (24) connected with the top end of the water lifting hose (22) and a water return hose (23) connected with the transition pipe (24), the water raising hose (22) and the water returning hose (23) are both vertically arranged and are both positioned above the tested pump (2), the transition pipe (24) is vertically connected with the water raising hose (22) and the water return hose (23), the water outlet end of the water return hose (23) is communicated with the test tank (1), a lift switch valve (29) and a pressure gauge (7) are arranged at the water inlet side of the water raising hose (22), the transition pipe (24) is connected with a telescopic mechanism for adjusting the vertical height of the water raising hose (22).

10. The accelerated test device for the service life reliability of the water pump according to claim 1, wherein the temperature compensation and measurement module comprises a temperature measurement component and a temperature compensation component, the temperature measurement component and the temperature compensation component are electrically connected with the control module (13), the temperature measurement component is used for measuring the temperature of the working medium and transmitting the temperature to the temperature compensation component, the temperature compensation component judges whether the temperature is at a preset temperature, and if so, the temperature compensation component transmits the temperature to the control module (13); otherwise, the temperature compensation component performs temperature compensation on the working medium of the test tank (1).

Technical Field

The invention relates to the field of water pump tests, in particular to an accelerated test device for the service life reliability of a water pump.

Background

Water pumps are machines that deliver or pressurize fluid. The service life of the water pump, as a product, is of great concern to consumers. When the flow and the lift meet the requirements of consumers, the water pump with longer service life is favored by the consumers. For a water pump, the most effective and reliable method to know its exact service life is to test its service life. Through the life test, not only can accurate life information be obtained, but also weak points of product design and manufacture can be found, and product optimization is guided in turn. Therefore, it is necessary to perform a life test of the water pump.

The service life test mainly comprises a conventional service life test and an accelerated service life test. The conventional life test is a long-term life test carried out under a rated working stress condition and a conventional environment, the test result is very accurate, but the cost is extremely high, and the period is extremely long; the accelerated life test is a test method for obtaining a numerical estimation that the characteristics of a product can be reproduced under a rated stress level by converting information obtained under an accelerated environment exceeding a normal stress level by using a statistical model related to a physical failure rule on the basis of reasonable engineering and statistical hypothesis. In short, the accelerated life test is a life test method for shortening the test period by increasing the test stress under the condition of keeping the failure mechanism unchanged. The accelerated life test adopts the accelerated stress level to carry out the life test of the product, thereby shortening the test time, improving the test efficiency and reducing the test cost.

A series of parameters must be determined to perform the accelerated life test including, but not limited to, test duration, number of samples, purpose of the test, confidence required, accuracy required, cost, acceleration factor, outfield environment, test environment, acceleration factor calculation, weibull distribution slope, or beta parameter (β <1 denotes early failure, β >1 denotes loss failure). The product life is determined by an accelerated life test method, and the key is to determine an acceleration factor. At present, the device for testing the service life of a water pump generally comprises: each group of water pumps is independently connected with a container filled with working medium, and continuously operates under the working medium at normal temperature until a fault occurs, and each group of water pumps is connected with a pressure difference meter and a flow meter which are huge in size. The test system used by the test device occupies a large space; meanwhile, the test system does not control the temperature, the pH value or the viscosity of the working medium, so that the accelerated life test of the water pump under different accelerated working conditions cannot be carried out, and the test period is long.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an accelerated test device for the service life reliability of a water pump, which can carry out multi-factor and multi-level composite accelerated service life test on the water pump under different working conditions, reasonably predict the service life of the water pump in a use environment, provide valuable data for design, production, process and the like, and can identify and predict weak links of a product in the use process in advance.

The purpose of the invention is realized by adopting the following technical scheme:

an accelerated test device for the service life reliability of a water pump comprises a tested pump, a test tank filled with working media, a power supply excitation module for regulating the voltage and frequency of the tested pump, a control module, a sediment content compensation measurement module for controlling and changing the sediment content in the working media, a temperature compensation temperature measurement module for controlling and changing the temperature of the working media, an acidity and alkalinity monitoring and adjusting module for adjusting and monitoring the acidity and alkalinity of the working media, a microbial humus/high-molecular resin coating waste liquid viscous substance generation compensation module for controlling and changing the content level of microbial humus/high-molecular resin coating waste liquid viscous substances in the working media, a working medium viscosity measurement module for measuring the viscosity value or the viscosity value of the working media and a lift adjustable module, wherein the tested pump is arranged in an array manner and sinks into the working media in the test tank, and a water outlet of the tested pump is connected with a water outlet pipe, the water outlet end of the water outlet pipe is connected with a water return pipe, the water outlet end of the water return pipe is connected with the test tank, the test pump sucks working media in the test tank through the water outlet pipe during working, then the working media are pumped back to the test tank through the water return pipe, the power supply excitation module is connected between the control module and the test pump, and the control module adjusts the voltage, the frequency and the current of the test pump through the power supply excitation module.

Furthermore, the test sample size of the tested pump is a natural number and is more than or equal to three.

Furthermore, multiple groups of tested pumps are connected to the same power supply excitation module, or each group of tested pumps is connected to one power supply excitation module.

Furthermore, a water outlet pipe of the tested pump is provided with a pump switch valve.

Furthermore, a separation plate is arranged in the test tank, the separation plate divides the test tank into a first area and a second area, working media in the first area are circularly communicated with working media in the second area, a variable frequency water pump for homogenizing, dispersing and fluctuating action of working water quality is arranged in the first area, a first circulating water pump and a second circulating water pump are respectively arranged in the first area and the second area, the first circulating water pump and the second circulating water pump are connected in parallel, the first circulating water pump and the second circulating water pump respectively comprise at least 3 tested pumps connected in parallel, and water outlet ends of the first circulating water pump and the second circulating water pump are connected with a water inlet end of the water return pipe through a pipeline.

Furthermore, the test tank is connected with a water supply pipe, the outlet end of the water supply pipe is connected with the test tank, and the outlet end of the water supply pipe is provided with a valve switch.

Furthermore, the power excitation module at least comprises a single-type power supply or a combined-type power supply, the single-type power supply comprises a single-phase alternating-current variable-frequency power supply or a three-phase alternating-current variable-frequency power supply or a direct-current voltage-stabilizing constant-current power supply, and the combined-type power supply comprises any two or three of the single-phase alternating-current variable-frequency power supply, the three-phase alternating-current variable-frequency power supply and the direct-current voltage-stabilizing constant-current power supply.

Furthermore, a supporting device used for supporting the tested pump is arranged in the test groove, the supporting device comprises a supporting plate, a vertical plate and a positioning piece, the vertical plate is perpendicularly connected with the supporting plate, the tested pump is placed on the supporting plate, a vertical guide rail is arranged in the test groove, the vertical plate is provided with a guide block in sliding fit with the vertical guide rail, the vertical guide rail is provided with a guide groove in the vertical direction, a plurality of adjusting holes are formed in the positions, corresponding to the guide groove, of the vertical plate, and the positioning piece is inserted into the adjusting holes and can abut against the guide block to fix the vertical plate at the corresponding positions of the adjusting holes.

Furthermore, the lift-adjustable module comprises a water pumping hose connected with the water outlet end of the water outlet pipe, a transition pipe connected with the top end of the water pumping hose and a water return hose connected with the transition pipe, the water pumping hose and the water return hose are vertically arranged and are both located above the tested pump, the transition pipe is vertically connected with the water pumping hose and the water return hose, the water outlet end of the water return hose is communicated with the test groove, a lift switch valve and a pressure gauge are arranged on the water inlet side of the water pumping hose, and the transition pipe is connected with a telescopic mechanism used for adjusting the vertical height of the water pumping hose.

Furthermore, the temperature compensation and measurement module comprises a temperature measurement component and a temperature compensation component, the temperature measurement component and the temperature compensation component are electrically connected with the control module, the temperature measurement component is used for measuring the temperature of the working medium and transmitting the temperature to the temperature compensation component, the temperature compensation component judges whether the temperature is at a preset temperature, and if so, the temperature compensation component transmits the temperature to the control module; otherwise, the temperature compensation component performs temperature compensation on the working medium of the test tank.

Compared with the prior art, the invention has the beneficial effects that:

the device provided by the invention adopts different voltages, frequencies or currents as the accelerated stress level of the test for the tested pump and carries out an accelerated life test under the set operation accelerated working condition, and by arranging a sediment content compensation measuring module, a temperature compensation temperature measuring module, a pH value monitoring and adjusting module, a microorganism humic substance/high polymer resin coating waste liquid viscous substance generation compensating module, a working medium viscosity measuring module and a lift adjusting module, the device can realize an accelerated reliability comprehensive simulation test under six acceleration factor self-selection composite working conditions, can reasonably predict the service life of a water pump assembly in the use environment, provides valuable data for design, production, process and the like, and can identify and predict the weak link of the product in the use process in advance. The method is suitable for researching acceleration reliability of various pumps, equivalence and correlation of actual service life of products under complex working conditions, and can lay a more scientific test method and equipment foundation for establishing a life cycle curve, identifying Mean Time Between Failures (MTBF) and defects of the water pump, identifying failure modes and defects, identifying failure rate and service life distribution, and finally establishing a life cycle map of pump products.

Drawings

FIG. 1 is a schematic diagram of an accelerated testing apparatus for reliability of water pump life according to the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of a supporting device of an accelerated testing apparatus for reliability of water pump life according to the present invention;

in the figure: 1. a test tank; 2. a pump under test; 3. a water outlet pipe; 4. a water return pipe; 5. a pump switching valve; 6. a circulation on-off valve; 7. a pressure gauge; 8. a separator plate; 9. a first region; 10. a second region; 11. a variable frequency water pump; 12. a valve switch; 13. a control module; 14. a socket; 15. a support plate; 16. a vertical plate; 17. a vertical guide rail; 18. a guide block; 19. a guide groove; 20. a positioning member; 21. a second telescopic rod; 22. a water raising hose; 23. a water return hose; 24. a transition duct; 25. a water column indicator sheet; 26. measuring a scale; 27. a mirror; 28. an observation mirror; 29. a lift switch valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "one," "another," and the like are used to distinguish similar elements, and these terms and other similar terms are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Corresponding reference numerals are used throughout the figures to indicate corresponding or corresponding elements (e.g., elements identified as "1 XX" and "2 XX" are structurally identical and functionally similar).

As shown in fig. 1-3, the accelerated testing device for the service life reliability of a water pump provided by the present invention comprises a tested pump 2, a test tank 1 filled with a working medium, a power excitation module, a control module 13, a silt content compensation measuring module for controlling and changing the silt content in the working medium, a temperature compensation temperature measuring module for controlling and changing the temperature of the working medium, a ph value monitoring and adjusting module for adjusting and monitoring the ph value of the working medium, a microbial humus/polymer resin coating waste liquid viscous substance generation compensating module for controlling and changing the content level of the microbial humus/polymer resin coating waste liquid viscous substance in the working medium, a working medium viscosity measuring module for measuring the viscosity value or viscous resistance value of the working medium, and a lift adjusting module, wherein the tested pump 2 is arranged in an array manner and sunk into the working medium in the test tank 1, and a water outlet of the tested pump 2 is connected with a water outlet pipe 3, the water outlet end of the water outlet pipe 3 is connected with a water return pipe 4, the water outlet end of the water return pipe 4 is connected with the test tank 1, the test pump 2 sucks working media in the test tank 1 through the water outlet pipe 3 during working, then the working media are pumped back to the test tank 1 through the water return pipe 4, the power supply excitation module is connected between the control module 13 and the test pump 2, and the control module 13 adjusts the voltage, the frequency and the current of the test pump 2 through the power supply excitation module.

In the embodiment, the accelerated test process comprises the following steps of determining the number of tested pumps 2, selecting the number according to actual conditions, dividing the tested pumps 2 into a plurality of test groups to be immersed into working media in a test tank 1, connecting a water outlet pipe 3 with the tested pumps 2, and connecting the water outlet pipe 3 with a water return pipe 4; and then, selecting a corresponding power supply excitation module according to the nameplate parameter of the tested pump 2, setting a corresponding acceleration voltage value or acceleration frequency value or acceleration current value, setting a corresponding operation condition, adjusting the setting of the condition according to the silt content compensation measurement module, the temperature compensation temperature measurement module, the pH value monitoring and adjusting module, the microbial humus/high polymer resin coating waste liquid viscous substance generation compensation module, the working medium viscosity measurement module and the head adjustable module, and then connecting the tested pump 2, the power supply excitation module and the control module 13, so that the tested pump 2 can be subjected to an acceleration test. The system comprises a sediment content compensation measuring module, a temperature compensation temperature measuring module, a pH value monitoring and adjusting module, a microorganism humic substance/high polymer resin coating waste liquid viscous substance generation compensating module, a working medium viscosity measuring module and a lift adjusting module, wherein the sediment content compensation measuring module is used for simulating a water pump reliability accelerated test environment under the actual working condition that a working medium has heavier sediment content, the temperature compensation temperature measuring module is used for simulating the water pump reliability accelerated test environment under the condition that the working medium has higher temperature, the pH value monitoring and adjusting module is used for simulating the water pump reliability accelerated test environment under the condition that the working medium has more acidity or alkalinity, the microorganism humic substance/high polymer resin coating waste liquid viscous substance generation compensating module is used for simulating the water pump reliability accelerated test environment under the condition that the working medium has more viscosity and more viscosity due to the dissolution of a large amount of organic substances, the working medium viscosity measuring module is used for monitoring the viscosity resistance load level under the condition that the working medium has more viscosity and more viscosity due to the dissolution of a large amount of organic substances, and the lift adjusting module is used for simulating the accelerated test conditions that the lift can automatically change corresponding to the lift when different water pumps are provided.

The device provided by the invention adopts different voltages, frequencies and currents as the accelerated stress level of the test for the tested pump 2, carries out an accelerated life test under the set operation accelerated working condition, and can realize an accelerated reliability comprehensive simulation test under six acceleration factor self-selection composite working conditions by arranging a sediment content compensation measuring module, a temperature compensation temperature measuring module, a pH value monitoring and adjusting module, a microorganism humic substance/high polymer resin coating waste liquid viscous substance generation compensating module, a working medium viscosity measuring module and a lift adjusting module, so that the service life of the water pump assembly in the use environment can be reasonably predicted, valuable data can be provided for design, production, process and the like, and weak links of the product in the use process can be recognized and predicted in advance. The method is suitable for researching acceleration reliability of various pumps, equivalence and correlation of actual service life of products under complex working conditions, and can lay a more scientific test method and equipment foundation for establishing a life cycle curve, identifying Mean Time Between Failures (MTBF) and defects of the water pump, identifying failure modes and defects, identifying failure rate and service life distribution, and finally establishing a life cycle map of pump products.

Preferably, the test sample size of the pump under test 2 is a natural number and is equal to or greater than three. Specifically, the test sample amount is preferably a positive odd number and three or more. Therefore, the scientificity, effectiveness and reliability of the analysis and evaluation of the test result and the tightness of judgment and conclusion can be improved.

Preferably, a plurality of groups of the tested pumps 2 are connected to the same power supply excitation module, or each group of the tested pumps 2 is connected to one different power supply excitation module. When a plurality of tested pumps 2 are connected to the same power supply excitation module, the nameplate parameters of the plurality of groups of tested pumps 2 are the same, and the power supply excitation module outputs the same accelerating voltage or accelerating frequency or accelerating current to the plurality of groups of tested pumps 2; each group of tested pumps 2 are connected with one power supply excitation module which is different from each other, so that the nameplate parameters of each group of tested pumps 2 are different, and the corresponding power supply excitation modules are also different, thereby carrying out mixing acceleration tests on different tested pumps 2.

Preferably, the water outlet pipe 3 of the tested pump 2 is provided with a pump switch valve 5, and the water return pipe 4 is provided with a circulating switch valve 6. The switch of the water outlet side of the tested pump 2 can be controlled through the pump switch valve 5, and once the pump switch valve 5 of any tested pump 2 is completely closed or semi-opened and semi-closed, the test device can directly realize the accelerated test operation of the locked rotor of the water pump.

Preferably, a partition plate 8 is arranged in the test tank 1, the test tank 1 is divided into a first area 9 and a second area 10 by the partition plate 8, a working medium in the first area 9 is circularly communicated with a working medium in the second area 10, the first area 9 is provided with a variable frequency water pump 11 for homogenizing, dispersing and fluctuating action of working water quality, the first area 9 and the second area 10 are respectively provided with a first circulating water pump and a second circulating water pump, the first circulating water pump and the second circulating water pump are connected in parallel, the first circulating water pump and the second circulating water pump respectively comprise at least 3 tested pumps 2 connected in parallel, and water outlet ends of the first circulating water pump and the second circulating water pump are connected with a water inlet end of the water return pipe 4 through pipelines.

In the embodiment, in order to simulate the motion state of the working medium in different hydrological characteristic environments, the test tank 1 is divided into a first area 9 and a second area 10 by the partition plate 8, because the first circulating water pump of the first area 9 sucks the working medium in the first area 9 and pumps the working medium back to the first area 9 through the water outlet pipe 3, the second circulating water pump of the second area 10 sucks the working medium in the second area 10 and pumps the working medium back to the first area 9 through the water return pipe 4, the working medium in the first area 9 can generate a large homogenizing and dispersing fluctuation effect, and the second area 10 only has a slight homogenizing and dispersing fluctuation effect formed by the test pump 2, most of the homogenizing and dispersing fluctuation effect can be eliminated after the returned working medium passes through the partition plate 8, so that the second area 10 keeps a relatively calm state relative to the first area 9, so that the first region 9 and the second region 10 form two working medium environments with different states; in addition, the size of the homogenization dispersion fluctuation action of the working medium in the first region 9 can be flexibly adjusted through the arrangement of the variable frequency water pump 11.

Preferably, the test tank 1 is connected with a water supply pipe, the outlet end of the water supply pipe is connected with the test tank, and the outlet end of the water supply pipe is provided with a valve switch 12. The water inlet amount of the water supply pipe is controlled through the valve switch 12, and the water level of the test tank 1 is conveniently and accurately controlled. The valve switch 12 of this embodiment has functions of unidirectional water injection and water locking, and may be a floating ball valve switch or a unidirectional electromagnetic valve or any unidirectional liquid auto-induction response valve member, where the floating ball valve switch or the unidirectional electromagnetic valve is the prior art, and is not limited herein.

Preferably, the power supply excitation module at least comprises single-type power supply excitation or combined-type power supply excitation, the single-type power supply excitation comprises a single-phase alternating-current variable-frequency power supply or a three-phase alternating-current variable-frequency power supply or a direct-current voltage-stabilizing constant-current power supply, and the combined-type power supply comprises any two or three of the single-phase alternating-current variable-frequency power supply, the three-phase alternating-current variable-frequency power supply and the direct-current voltage-stabilizing constant-current power supply.

In this embodiment, for the convenience of the circuit connection of the tested pump 2, the power excitation module further comprises a set or a plurality of sets of HUB type power supply sockets 14, wherein the HUB type power supply sockets 14 can be configured with independent physical on-off switches, and the physical on-off switches can be mechanical switches, key switches, ship-shaped toggle switches, and the like. When only a single type power supply is adopted, the single type power supply forms a group, and particularly when a combined type power supply is used for providing more complex power supply excitation, three adjustable power supply excitations with different characteristics of single-phase alternating current, three-phase alternating current and direct current are respectively and independently formed into a group, and the adjustable power supply excitations are used for adjusting working electrical parameters (voltage, frequency and current) of each group of tested pumps 2 controlled by the adjustable power supply excitations under the accelerated test working condition and providing the test power supply excitation of the tested pumps 2 corresponding to the test group.

Preferably, a supporting device for supporting the pump under test 2 is arranged in the test tank 1, the supporting device includes a supporting plate 15, a vertical plate 16 vertically connected to the supporting plate 15, and a positioning member 20, the pump under test 2 is placed on the supporting plate 15, a vertical guide rail 17 is arranged in the test tank 1, the vertical plate 16 is provided with a guide block 18 in sliding fit with the vertical guide rail 17, the vertical guide rail 17 is provided with a guide groove 19 along the vertical direction, a plurality of adjusting holes are arranged at positions of the vertical plate 16 corresponding to the guide groove 19, and the positioning member 20 is inserted into the adjusting holes and can abut against the guide block 18 to fix the vertical plate 16 at the corresponding adjusting hole positions.

In this embodiment, the depth of the tested pump 2 in the working medium can be adjusted by moving the vertical plate 16 up and down, so that the tested pumps 2 with different volumes can be submerged. The specific adjusting process is as follows: the guide block 18 is moved up and down along the vertical guide rail 17, and when the vertical plate 16 is moved to the target position, the vertical plate is fixed at the target position by a positioning member 20, and the positioning member 20 is preferably a bolt; to facilitate depth determination, a graduated scale is provided on one side of the riser 16.

Preferably, the lift-adjustable module comprises a water-raising hose 22 connected with the water outlet end of the water outlet pipe 3, a transition pipe 24 connected with the top end of the water-raising hose 22, and a water-returning hose 23 connected with the transition pipe 24, the water-raising hose 22 and the water-returning hose 23 are both vertically arranged and are both located above the tested pump 2, the transition pipe 24 is vertically connected with the water-raising hose 22 and the water-returning hose 23, the water outlet end of the water-returning hose 23 is communicated with the test tank 1, a lift switch valve 29 and a pressure gauge 7 are arranged on the water inlet side of the water-raising hose 22, and the transition pipe 24 is connected with a telescopic mechanism for adjusting the vertical height of the water-raising hose 22.

When the pump 2 to be tested is subjected to an acceleration test with a head stress, the circulation switch valve 6 is closed, the pump switch valve 5 and the head switch valve 29 are opened, then the telescopic mechanism is adjusted, the water lifting hose 22 is lifted to a preset height, and the preset height is the set acceleration head height, so that the acceleration test with a certain height head in the water circulation of the pump 2 to be tested is realized. Adjust the height of lifting hose 22 through telescopic machanism, so can carry out the life-span test with higher speed of different lift conditions to the tested pump 2, flexibility and practicality are stronger.

The invention shows a specific embodiment of a telescopic mechanism, wherein the telescopic mechanism comprises a telescopic rod assembly, the telescopic rod assembly comprises a first telescopic rod (not shown in the drawing), a second telescopic rod 21 and a screw rod, the first telescopic rod and the second telescopic rod 21 are both hollow structures, the bottom of the first telescopic rod is closed, the top end of the first telescopic rod is open, the second telescopic rod 21 is movably arranged in the first telescopic rod, the top end of the second telescopic rod 21 penetrates through the top end opening of the first telescopic rod and extends upwards, the bottom end of the second telescopic rod 21 is in threaded connection with the screw rod, a motor is arranged at the bottom in the first telescopic rod, an output shaft of the motor is fixedly connected with the screw rod, the screw rod is driven by the motor to rotate, so as to drive the second telescopic rod 21 to ascend or descend, the top end of the second telescopic rod 21 is provided with a connecting component for connecting the transition pipe 24. Can realize the control to the rising or the decline of second telescopic link 21 through step motor to make the improvement of the certain degree that the flexible precision of second telescopic link 21 got, so can accurate control lift height, satisfy the test of accelerating test of different lifts.

Specifically, coupling assembling include with the connecting plate that the top of second telescopic link 21 is connected and set up the pipe strap on the connecting plate, the outside of telescopic link outside is extended out to the connecting plate, the pipe strap be equipped with the card hole of 24 looks joints of transition pipe.

Preferably, still include water column indicator panel 25, water column indicator panel 25 is located the hose 22 top below of pumping water just water column indicator panel 25 with telescopic machanism connects, water column indicator panel 25 position is for the height of pumping water of tested pump 2. When carrying out the test of the lift with higher speed, set for earlier with higher speed the lift target height, adjust the height of lift hose 22 through telescopic machanism promptly, make it can satisfy the needs of the target height of lift with higher speed, at this moment, the position of water column indicator 25 is the highest position of the water column lift in the lift hose 22 when carrying out the test with higher speed for tested pump 2, promptly with higher speed the lift.

Specifically, still include dipperstick 26, the initial end of dipperstick 26 with water column indicator piece 25 is connected. The setting of dipperstick 26 can conveniently measure the lift of subject pump 2.

Preferably, one side of water column indicator chip 25 is equipped with speculum 27, speculum 27 sets up for the slant, and the mirror surface orientation of speculum 27 the pumping hose 22 and orientation are equipped with observation mirror 28 in pumping hose 22 bottom one side, observation mirror 28 is located under speculum 27, observation mirror 28 sets up for the slant, just the mirror surface orientation of observation mirror 28 the mirror surface of speculum 27. The arrangement of the reflector 27 and the observation mirror 28 is convenient for observing and determining whether the lift water column reaches the position of the water column indicating sheet 25.

Preferably, the temperature compensation and measurement module comprises a temperature measurement component and a temperature compensation component, the temperature measurement component and the temperature compensation component are electrically connected with the control module 13, the temperature measurement component is used for measuring the temperature of the working medium and transmitting the temperature to the temperature compensation component, the temperature compensation component judges whether the temperature is at a preset temperature, and if so, the temperature compensation component transmits the temperature to the control module 13; otherwise, the temperature compensation component performs temperature compensation on the working medium of the test tank 1. In this embodiment, the temperature measurement component and the temperature compensation component are arranged, so that the temperature of the working medium can be accurately controlled and adjusted to a target value, and the defect that the test results of different tested pumps 2 lack comparability due to the fact that the conventional service life test system cannot control the temperature of the working medium is overcome.

Preferably, the ph monitoring and adjusting module includes a ph adjusting assembly and a ph detecting probe, the ph detecting probe is used for measuring the ph of the working medium and transmitting the ph to the control module 13, the control module 13 determines whether the ph is at a preset ph, if not, the control module 13 transmits the ph to the ph adjusting assembly to control the ph adjusting assembly to adjust the ph of the working medium to the preset ph. In this embodiment, the setting of pH value adjusting assembly and pH value detecting probe can accurately control and adjust the pH value of the working medium to the target value, and overcomes the defect that the existing life testing system can not control the pH value of the working medium, so that the testing results of different tested pumps 2 lack comparability.

The pH value adjusting component of this embodiment includes pH value adjuster and pH material and adds the pipe, wherein, the pH value adjuster includes known organic, inorganic, synthetic and natural acidic material or alkaline material, or the buffer solution that the preparation of acid-base combination gained, pH material adds the pipe and is connected with test chamber 1, the staff can learn the pH value of test chamber 1 according to pH value test probe, then pour into pH value adjuster from pH material interpolation pipe according to gained pH value, thereby adjust the pH value of working medium in test chamber 1 to predetermineeing pH value.

The silt content compensation measuring module comprises a silt measuring component and a silt compensation component, the silt measuring component and the silt compensation component are electrically connected with the control module 13, the silt measuring component is used for measuring the silt content of the working medium and transmitting the silt content to the silt compensation component, the silt compensation component judges whether the silt content is in a preset silt content, and if yes, the silt compensation component transmits the silt content to the control module 13; otherwise, the silt compensation component compensates the silt content of the working medium of the test tank 1.

The microbial humus/high-molecular resin coating waste liquid viscous substance generation compensation module comprises a generation assembly and a compensation assembly, wherein the generation assembly is used for providing a microbial humus/high-molecular resin coating waste liquid viscous substance with a preset target dose to the test tank 1, then the working medium viscosity value or viscous resistance value is measured through the working medium viscosity measurement module, the control module 13 judges whether the working medium viscosity value or viscous resistance value is in the preset viscosity value or viscous resistance value, if not, the control module 13 transmits the viscosity value or viscous resistance value to the compensation assembly to control the compensation assembly to add the microbial humus/high-molecular resin coating waste liquid viscous substance to the test tank 1, so that the working medium reaches the preset viscosity value or viscous resistance value. The working medium viscosity measuring module of the embodiment can be a viscosity measuring instrument.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.