1. A water pump testing system comprising at least one testing unit, the testing unit comprising:

the device comprises a tank body, a water pump and a water pump, wherein the tank body is used for storing liquid for testing, and a water inlet of the water pump is immersed in the liquid;

the fixed platform is used for mounting the water pump, and at least one pump position is arranged on the fixed platform;

the U-shaped pipes correspond to the pump positions one by one, are vertically arranged, the bent ends of the U-shaped pipes are far away from the tank body, the inlet ends of the U-shaped pipes are connected with a water outlet of a water pump, and the outlet ends of the U-shaped pipes are connected with the tank body, so that the liquid in the tank body can return to the tank body after being pumped into the U-shaped pipes by the water pump;

the water flow switches correspond to the U-shaped pipes one by one, are arranged at the outlet ends of the U-shaped pipes and are used for detecting whether the liquid flows through the outlet ends of the U-shaped pipes or not; and the number of the first and second groups,

and the control device is electrically connected with the water pump and is in communication connection with the water flow switch.

2. The water pump testing system of claim 1, wherein the number of the testing units is multiple, and the control devices of the multiple testing units are electrically connected with the control terminal after being connected in parallel.

3. The water pump testing system of claim 1 or 2, wherein the control device is disposed remotely from the trough and the U-tube.

4. The water pump test system according to claim 1 or 2, wherein the control device comprises acquisition modules, the acquisition modules are connected with the water pumps one by one through water pump circuit branches, each water pump circuit branch is connected with one water pump, and the water pump circuit branches are connected in parallel.

5. The water pump testing system according to claim 1 or 2, wherein the water pump is formed with oppositely arranged fixing holes, and bolts penetrate through the fixing holes to mount the water pump on the pump position of the fixing table.

6. The water pump test system according to claim 1 or 2, wherein the water outlet of the water pump is connected with the inlet end of the U-shaped pipe through a rubber hose.

7. The water pump testing system of claim 1 or 2, further comprising a locked rotor for locking an impeller of the water pump when performing a water pump locked rotor test.

8. The water pump test system according to claim 7, wherein the control device comprises current transformers, the current transformers correspond to the pump positions in a one-to-one mode, input sides of the current transformers are connected with the water pump circuit branches, and output sides of the current transformers are connected with the current sensors.

9. The water pump testing system of claim 1 or 2, further comprising a buzzer, wherein the buzzer is electrically connected with the control device to prompt whether the test result is qualified.

10. The water pump testing system of claim 1 or 2, further comprising a tool rack for fixing the testing unit, wherein the tool rack comprises a fixing rod, a through hole is formed in the fixing rod for accommodating the U-shaped pipe, and the water flow switch is fixed on the fixing rod; the height of the U-shaped pipe is equal to the rated lift of the water pump.

11. A method of long-term life testing using a water pump testing system according to any one of claims 1 to 10, comprising the steps of:

immersing a water inlet of the water pump in the test liquid in the tank body;

fixing the water pump on a pump position on the fixed table;

enabling the water pump to work under a preset condition;

pumping the liquid in the tank body into the inlet end of the U-shaped pipe by a water pump, and returning the liquid to the tank body from the outlet end of the U-shaped pipe;

when the water flow switch detects that the liquid flows out of the outlet end of the U-shaped pipe, counting and timing are carried out;

stopping the water pump when the water pump runs for a preset time; if the water pump stops running, the counting of the water flow switch is equal to the switching times of the water pump, and the last time of the water flow switch is equal to the preset time length, the water pump is qualified; otherwise, the water pump is unqualified.

12. The method of claim 11, wherein a buzzer sounds an alarm if a water flow switch fails to monitor the fluid after a pump on/off cycle.

13. The method of claim 11, wherein the liquid is water or a mixture of water and other substances.

14. The long-term life test method according to claim 11, wherein the preset time period is 1000 hours.

15. A locked rotor test method using the water pump test system according to any one of claims 1 to 10, comprising the steps of:

fixing the water pump on a pump position on the fixed table;

blocking the impeller of the water pump by using a rotor blocking device;

applying a voltage greater than the rated voltage of the water pump to the water pump;

if the preset time period passes, the water pump is not burnt out, and the water pump is qualified; otherwise, the water pump is unqualified.

16. The locked rotor test method according to claim 15, wherein the preset time period is 15 days.

17. The locked rotor test method according to claim 15, wherein a current sensor is used for monitoring the current in the output side of the current transformer so as to monitor the current in a branch of the water pump circuit connected with the input side of the current transformer, and if the monitored current in the branch of the water pump circuit is greater than the upper limit of the current threshold, a buzzer alarms.

18. The locked rotor test method according to claim 15, wherein the water pump is burnt out and a buzzer alarms.

Background

The quality of the water pump affects the service life of household appliances with water pumps, such as air conditioners, water heaters, water purifiers and the like. And analyzing and rechecking a batch of fault water pumps, wherein open circuit/short circuit and seizure account for more than 80% of the total fault amount.

Before the water pump leaves a factory, important performance (such as reliability) of the water pump needs to be detected, wherein long-term service life test and locked rotor test are taken as reliability tests to be beneficial to ensuring that the water pump can run reliably for a long time. Because there is no special test system, the traditional detection method is to install the water pump into the whole machine for testing.

Therefore, a water pump testing system is urgently needed to perform long-term service life testing and locked rotor testing, so that the reliability of the water pump is detected, and the reliability of the water pump leaving a factory is guaranteed.

Disclosure of Invention

In view of the problems in the prior art, the application provides a water pump testing system, a long-term service life testing method and a locked rotor testing method.

In a first aspect, the present invention provides a water pump testing system, the system comprising at least one testing unit, the testing unit comprising: the device comprises a tank body, a water pump and a water pump, wherein the tank body is used for storing liquid for testing, and a water inlet of the water pump is immersed in the liquid; the fixed platform is used for mounting the water pump, and at least one pump position is arranged on the fixed platform; the U-shaped pipes correspond to the pump positions one by one, are vertically arranged, the bent ends of the U-shaped pipes are far away from the tank body, the inlet ends of the U-shaped pipes are connected with a water outlet of a water pump, and the outlet ends of the U-shaped pipes are connected with the tank body, so that the liquid in the tank body can return to the tank body after being pumped into the U-shaped pipes by the water pump; the water flow switches correspond to the U-shaped pipes one by one, are arranged at the outlet ends of the U-shaped pipes and are used for detecting whether the liquid flows through the outlet ends of the U-shaped pipes or not; and the control device is electrically connected with the water pump and is in communication connection with the water flow switch. By utilizing the system, long-term service life test and locked rotor test can be carried out, so that the reliability of the water pump is detected, and the reliability of the water pump leaving a factory is guaranteed.

In one embodiment of the first aspect, the test unit includes a plurality of test units, and the control devices of the plurality of test units are electrically connected to the control terminal after being connected in parallel. By the implementation mode, the bearing capacity and the expansion capacity of the system are greatly improved.

In one embodiment of the first aspect, the control device is disposed remotely from the tank and the U-tubes. Through this embodiment, be favorable to improving controlling means's life, avoid it to be affected with tide, damage.

In an embodiment of the first aspect, the control device includes an acquisition module, and the acquisition module is connected with the water pumps one by one through water pump circuit branches, where each water pump circuit branch is connected with one water pump, and each water pump circuit branch is connected in parallel. Through this embodiment, be favorable to monitoring the running state of water pump respectively to the flexibility of test has been improved.

In one embodiment of the first aspect, the water pump is formed with oppositely disposed fixing holes, and bolts are inserted through the fixing holes to mount the water pump to the pump positions of the fixing table. Through this embodiment, be favorable to avoiding the water pump to break away from the pump position, be favorable to improving the accuracy of test.

In one embodiment of the first aspect, the water outlet of the water pump is connected with the inlet end of the U-shaped pipe through a rubber hose. By the implementation mode, the rubber hose is prevented from being broken in the long-term test process, and the test stability is improved; and the rubber hose connection is taken as the detachable connection mode, is favorable to the change of U type pipe.

In one embodiment of the first aspect, the system further comprises a lock-rotor for locking an impeller of the water pump when performing a lock-rotor experiment of the water pump. Through this embodiment, be favorable to the smooth going on of locked rotor test.

In an embodiment of the first aspect, the control device includes current transformers, the current transformers correspond to the pump positions one by one, an input side of each current transformer is connected to the water pump circuit branch, and an output side of each current transformer is connected to a current sensor. Through this embodiment, be favorable to accurately obtaining the electric current size in the water pump circuit branch road.

In one embodiment of the first aspect, the system further comprises a buzzer, and the buzzer is electrically connected with the control device to prompt whether the test result is qualified. By the implementation mode, the safety performance and the working efficiency of the test system are improved.

In an embodiment of the first aspect, the system further includes a fixture frame for fixing the test unit, the fixture frame includes a fixing rod, a through hole is formed in the fixing rod for accommodating the U-shaped tube, and the water flow switch is fixed on the fixing rod; the height of the U-shaped pipe is equal to the rated lift of the water pump. By the implementation mode, the long-term stable operation of the system is facilitated, and the U-shaped pipe is prevented from toppling and the water flow switch is prevented from sliding; and the accuracy of long-term service life test is improved.

In a second aspect, the present invention further provides a long-term life testing method using the water pump testing system according to the first aspect and any one of the embodiments thereof, where the long-term life testing method includes the following steps: immersing a water inlet of the water pump in the test liquid in the tank body; fixing the water pump on a pump position on the fixed table; enabling the water pump to work under a preset condition; pumping the liquid in the tank body into the inlet end of the U-shaped pipe by a water pump, and returning the liquid to the tank body from the outlet end of the U-shaped pipe; when the water flow switch detects that the liquid flows out of the outlet end of the U-shaped pipe, counting and timing are carried out; stopping the water pump when the water pump runs for a preset time; if the water pump stops running, the counting of the water flow switch is equal to the switching times of the water pump, and the last time of the water flow switch is equal to the preset time length, the water pump is qualified; otherwise, the water pump is unqualified. The long-term service life testing method is beneficial to detecting the reliability of the water pump and provides guarantee for the reliability of the water pump leaving a factory.

In one embodiment of the second aspect, the buzzer sounds an alarm if the water flow switch does not monitor the liquid after a pump on/off cycle. Through this embodiment, be favorable to improving the efficiency of long-term life test.

In one embodiment of the second aspect, the liquid is water or a mixture of water and another substance. Through this embodiment, be favorable to acquireing the data of the long-term life test of water pump under different liquid environment, be favorable to examining adaptability, the stability of water pump.

In one embodiment of the second aspect, the preset period of time is 1000 hours. Through this embodiment, be favorable to guaranteeing qualified water pump after the test can long-time, steady operation, improve the accuracy of test.

In a third aspect, the present invention further provides a locked rotor testing method using the water pump testing system according to the first aspect and any one of the embodiments of the first aspect, where the locked rotor testing method includes the following steps: fixing the water pump on a pump position on the fixed table; blocking the impeller of the water pump by using a rotor blocking device; applying a voltage greater than the rated voltage of the water pump to the water pump; if the preset time period passes, the water pump is not burnt out, and the water pump is qualified; otherwise, the water pump is unqualified. The locked rotor testing method is beneficial to detecting the reliability of the water pump and provides guarantee for the reliability of the water pump leaving the factory.

In one embodiment of the third aspect, the preset period of time is 15 days. Through this embodiment, be favorable to guaranteeing qualified water pump security performance under the locked-rotor condition, be favorable to improving the accuracy of test.

In one embodiment of the third aspect, a current sensor is used for monitoring the current of the output side of the current transformer so as to monitor the current in a water pump circuit branch connected with the input side of the current transformer, and if the monitored current in the water pump circuit branch is larger than the upper limit of the current threshold, a buzzer alarms. Through the implementation mode, the current in the branch circuit of the water pump circuit can be accurately acquired, and the safety performance of the locked rotor testing method is improved.

In one embodiment of the third aspect, the pump burns out and a buzzer alarms. By the implementation mode, the safety performance and the working efficiency of the test system are improved.

Compared with the prior art, the water pump test system, the long-term service life test method and the locked rotor test method provided by the invention have the following beneficial effects.

1. By utilizing the system, long-term service life test and locked rotor test can be carried out, so that the reliability of the water pump is detected, and the reliability of the water pump leaving a factory is guaranteed.

2. The test units are multiple, and the control devices of the test units are electrically connected with the control terminal after being connected in parallel. By the implementation mode, the bearing capacity and the expansion capacity of the system are greatly improved.

3. The control device comprises acquisition modules, the acquisition modules are connected with the water pumps one by one through water pump circuit branches, each water pump circuit branch is connected with one water pump, and the water pump circuit branches are connected in parallel. Through this embodiment, be favorable to monitoring the running state of water pump respectively to the flexibility of test has been improved.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings, in which:

FIG. 1 shows a left side view of a test cell according to an embodiment of the invention;

FIG. 2 shows a top view of a test cell according to an embodiment of the invention;

FIG. 3 shows a front view of a test unit according to an embodiment of the invention;

FIG. 4 is a schematic perspective view of a test unit according to an embodiment of the present invention;

FIG. 5 shows a circuit diagram of a water pump testing system according to an embodiment of the invention;

FIG. 6 shows a flow diagram of a long-term life testing method according to an embodiment of the invention;

fig. 7 shows a flow chart of a locked rotor testing method according to an embodiment of the invention.

List of reference numerals:

1-a test unit; 2-a groove body; 3-a fixed table; 4-U-shaped pipe; 5-water flow switch; 6-a control device; 7-a tooling frame; 8-a water pump; 41-inlet end of U-shaped pipe; 42-the outlet end of the U-tube; 61-an acquisition module; 62-water pump circuit branch; 63-a current transformer; 71-a fixing rod; 81-fixed orifices.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1 to 4, the present embodiment provides a water pump testing system, which includes at least one testing unit 1, where the testing unit 1 includes: the tank body 2 is used for storing liquid for testing, and a water inlet of the water pump is immersed in the liquid; the fixed platform 3 is used for installing a water pump 8, and at least one pump position is arranged on the fixed platform 3; the U-shaped pipes 4 correspond to the pump positions one by one, the U-shaped pipes 4 are vertically arranged, the bending ends of the U-shaped pipes 4 are far away from the tank body 2, the inlet ends 41 of the U-shaped pipes are connected with the water outlet of a water pump, and the outlet ends 42 of the U-shaped pipes are connected with the tank body 2, so that liquid in the tank body 2 can return to the tank body 2 after being pumped into the U-shaped pipes 4 by the water pump 8; the water flow switches 5 correspond to the U-shaped pipes 4 one by one, are arranged at the outlet ends 42 of the U-shaped pipes, and are used for detecting whether liquid flows through the outlet ends 42 of the U-shaped pipes; and a control device 6 electrically connected to the water pump 8 and communicatively connected to the water flow switch 5.

As shown in fig. 2 and 4, each test unit 1 includes a tank body 2 at the bottom, and at least one (six in this embodiment) pump position is arranged on the fixed table 3, and the pump position is used for installing a water pump 8, and a water inlet of the water pump is immersed in the liquid.

The U-shaped pipes 4 correspond to the pump positions one by one, the inlet ends 41 of the U-shaped pipes are connected with the water outlets of the water pumps, and the outlet ends 42 of the U-shaped pipes are connected with the tank body 2, so that liquid in the tank body 2 can return to the tank body 2 after being pumped into the U-shaped pipes 4 by the water pumps 8, and recycling of the liquid is achieved.

The U-shaped pipe 4 is vertically arranged, and the bent end of the U-shaped pipe 4 is far away from the groove body 2. When liquid is pumped into the U-tube 4 from the inlet end 41 of the U-tube, it will flow out from the outlet end 42 of the U-tube if it can pass the highest point of the U-tube 4, i.e. the bent end of the U-tube 4.

The water flow switches 5 correspond to the U-shaped pipes 4 one by one and are arranged at the outlet ends 42 of the U-shaped pipes. The water flow switch 5 is used for detecting whether liquid flows through the outlet end 42 of the U-shaped pipe, that is, whether liquid can pass through the highest point of the U-shaped pipe 4, that is, the bending end of the U-shaped pipe 4.

And the control device 6 is electrically connected with the water pump 8 and is in communication connection with the water flow switch 5. The control device 6 is used for controlling the opening and closing of the water pump 8 and monitoring the whole test process. The water flow switch 5 can transmit the information it has collected to the control device 6 to let the control device 6 know the progress of the long-term life test.

In the test process, liquid enters the water pump 8 from the tank body 2, then enters the U-shaped pipe 4 from the water pump 8, and then flows out of the U-shaped pipe 4 and returns to the tank body 2 to form liquid circulation.

The control device 6 monitors the operation index of at least one (six in the present embodiment) water pump 8, controls the opening and closing of the water pump 8, and can record the whole test process.

Alternatively, the U-shaped tube 4 is composed of a glass material.

The test system of the embodiment can perform long-term life test and locked rotor test, thereby detecting the reliability of the water pump 8 and providing guarantee for the reliability of the water pump 8 leaving the factory.

In one embodiment, as shown in fig. 5, the test unit 1 is provided in plurality, and the control devices 6 of the test units 1 are electrically connected to the control terminal in parallel.

Optionally, the control terminal may control 256 test units 1 to test simultaneously, and when each test unit 1 is connected to six water pumps 8, the system may test thousands of water pumps 8 simultaneously.

The embodiment greatly improves the bearing capacity and the expansion capacity of the system.

In one embodiment, as shown in FIG. 4, the control device 6 is located remotely from the tank 2 and the U-shaped pipe 4.

The control device 6 is an electric device and is far away from the trough body 2 and the U-shaped pipe 4, so that the control device 6 can be prevented from being damped and damaged, and the service life of the control device 6 is prolonged.

This embodiment is advantageous for improving the service life of the control device 6 and avoiding it from getting damp and damaged.

In one embodiment, as shown in fig. 5, the control device 6 includes an acquisition module 61, and the acquisition module 61 is connected to the water pumps 8 one by one through water pump circuit branches 62, wherein each water pump circuit branch 62 is connected to one water pump 8, and the water pump circuit branches 62 are connected in parallel.

In this embodiment, one water pump circuit branch 62 is connected to one water pump 8, and each water pump circuit branch 62 is connected in parallel, which is beneficial to monitoring the operating state of the water pump 8 respectively.

Meanwhile, because each water pump circuit branch 62 is connected in parallel, the pump position of the test unit 1 can be flexibly selected, for example, the test unit 1 of the embodiment has six pump positions, one, two, three, four or five of the pump positions can be selected optionally during testing, all the pump positions can be used certainly, the water pump circuit branch 62 corresponding to the empty pump position cannot interfere with the water pump circuit branch 62 corresponding to the test pump position, and the testing flexibility is improved.

In addition, because the pump circuit branches 62 are connected in parallel, the testing of each pump position is independent. The test on each pump position can be started and ended simultaneously, and can also be started and ended randomly without mutual influence. Of course, it is also possible to use a part of the pump positions of the test unit 1 for long-term life tests and a part of the pump positions for locked rotor tests.

This embodiment is favorable to monitoring the running state of water pump 8 respectively to the flexibility of test has been improved.

In one embodiment, as shown in fig. 2, the water pump 8 is formed with oppositely disposed fixing holes 81, and bolts are inserted through the fixing holes 81 to mount the water pump 8 to the pump positions of the fixing table 3.

This embodiment is favorable to firmly fixing water pump 8 in the testing process, avoids water pump 8 to break away from the pump position, is favorable to improving the accuracy of test.

In one embodiment, the water outlet of the water pump is connected with the inlet end 41 of the U-shaped pipe through a rubber hose.

The U-shaped tubes 4 of each test unit 1 are independent of each other.

The rubber hose of the embodiment has good flexibility, and the water outlet of the water pump is connected with the inlet end 41 of the U-shaped pipe through the rubber hose, so that the rubber hose is prevented from being broken in the long-term test process, and the test stability is improved; and the rubber hose connection is taken as a detachable connection mode, which is beneficial to the replacement of the U-shaped pipe 4.

In one embodiment, the system further comprises a locked rotor for locking the impeller of the water pump 8 when performing a locked rotor test of the water pump 8.

The locked rotor device of the embodiment is used for clamping the impeller of the water pump 8 during the locked rotor experiment of the water pump 8, and is favorable for smooth running of the locked rotor test.

Alternatively, the locked rotor is a threaded rod, screw, which can be inserted into the impeller of the water pump 8, blocking the rotation of the impeller, keeping the impeller stationary, to perform the locked rotor test.

In one embodiment, as shown in fig. 5, the control device 6 includes current transformers 63, the current transformers 63 correspond to the pump positions one by one, an input side of each current transformer 63 is connected to the water pump circuit branch 62, and an output side of each current transformer 63 is connected to a current sensor.

The current transformer 63 is used for scaling the current, so that the current on the output side of the current transformer is within the flow range of the current sensor, the current sensor works normally, the current value on the output side of the current transformer 63 is accurately displayed, and the current in the water pump circuit branch 62 connected with the input side of the current transformer 63 is accurately acquired.

This embodiment is advantageous for accurately obtaining the magnitude of the current in the water pump circuit branch 62.

In the locked rotor test process, when the water pump 8 is burnt out, the current is large, and if the current transformer 63 is not used, the current sensor arranged in the control device 6 is easy to damage.

In one embodiment, the system further comprises a buzzer, which is electrically connected with the control device 6 to indicate whether the test result is qualified.

When the test result is unqualified, the buzzer works, so that the alarm of a tester is aroused, the unqualified water pump 8 is removed in time, and other water pumps 8 to be tested are replaced, and the safety performance and the working efficiency of the test system are improved.

The embodiment is beneficial to improving the safety performance and the working efficiency of the test system.

In one embodiment, as shown in fig. 1 to 4, the system further includes a tool rack 7 for fixing the test unit 1, the tool rack 7 includes a fixing rod 71, the fixing rod 71 is provided with a through hole for accommodating the U-shaped pipe 4, and the water flow switch 5 is fixed on the fixing rod 71; the height of the U-shaped pipe 4 is equal to the rated lift of the water pump 8.

Alternatively, the tool rest 7 may be composed of an aluminum material.

Alternatively, the U-tube 4 is removable and has a height equal to the rated head of the water pump 8 to be tested, so that when the water flow switch 5 detects liquid, it can be verified that the water pump 8 has pumped the liquid to the rated head. The detachable U-shaped pipe 4 can facilitate the system to be matched with water pumps 8 with different rated lifts. The U-shaped tubes 4 of each test unit 1 are independent of each other. The height of the U-shaped pipe 4 is equal to the rated lift of the water pump 8, and the accuracy of long-term service life testing is improved.

The tool rack 7 improves the stability of the system, the fixing rod 71 is provided with a through hole for accommodating the U-shaped pipe 4, and the water flow switch 5 is fixed on the fixing rod 71, so that the long-term stable operation of the system is facilitated, and the U-shaped pipe 4 is prevented from toppling over and the water flow switch 5 slides.

The embodiment is beneficial to the long-term stable operation of the system, and the U-shaped pipe 4 is prevented from toppling and the water flow switch 5 is prevented from sliding; and the accuracy of long-term service life test is improved.

As shown in fig. 6, the present embodiment further provides a long-term life testing method using the water pump testing system, where the long-term life testing method includes the following steps: immersing the water inlet of the water pump in the test liquid in the tank body 2; fixing the water pump 8 on the pump position on the fixed table 3; the water pump 8 is made to work under preset conditions; the liquid in the tank body 2 is pumped into the inlet end 41 of the U-shaped pipe by the water pump 8 and then returns to the tank body 2 from the outlet end 42 of the U-shaped pipe; when the water flow switch 5 detects that liquid flows out of the outlet end 42 of the U-shaped pipe, counting and timing are carried out; when the operation of the water pump 8 reaches the preset time length, stopping the operation of the water pump 8; if the water pump 8 stops running, the counting of the water flow switch 5 is equal to the switching times of the water pump 8, and the last time of the water flow switch 5 is equal to the preset time length, the water pump 8 is qualified; otherwise, the water pump 8 is not qualified.

Wherein, the water pump 8 is operated under the preset condition to make the water pump 8 operate under the rated voltage and the rated lift.

When the water flow switch 5 detects that liquid flows out of the outlet end 42 of the U-tube, it is verified that the water pump 8 has pumped the liquid to the rated head.

The control means 6 controls the water pump 8 to be switched on and off, and optionally, the control means 6 switches off the water pump 8 each time the flow switch 5 detects liquid, and then switches on the water pump 8 again. If the water pump 8 is qualified, the number of times the water pump 8 is turned on should be equal to the count of the water flow on or off, i.e., the number of times the water flow switch 5 detects liquid. Meanwhile, if the water pump 8 is qualified, the water pump 8 should be kept in a controllable state and a working state within a preset time length, that is, the last time of timing is equal to the preset time length.

According to the embodiment, the reliability of the water pump is detected by testing the long service life, and the reliability of the water pump leaving a factory is guaranteed.

In one embodiment, the buzzer sounds an alarm if the water flow switch 5 does not monitor the liquid after a water pump 8 on-off cycle.

That is to say the water pump 8 closes and opens the back again, and rivers switch 5 can not monitor liquid, and the water pump 8 that opens promptly can not pump liquid into rated lift, and buzzer buzzing is reported to the police, reminds the tester that this water pump 8 is unqualified, in time replaces other water pumps 8 that await measuring. Design like this, be favorable to the tester in time to remove unqualified water pump 8, improve efficiency of software testing.

This embodiment is favorable to improving the efficiency of long-term life test.

In one embodiment, the liquid is water or a mixture of water and another substance.

This embodiment is favorable to acquireing the data of the long-term life test of water pump 8 under different liquid environment, is favorable to examining adaptability, the stability of water pump 8.

In one embodiment, the preset time period is 1000 hours.

This embodiment is favorable to guaranteeing that qualified water pump 8 after the test can long-time, steady operation, improves the accuracy of test.

As shown in fig. 7, the present embodiment further provides a locked rotor testing method using the water pump testing system, where the locked rotor testing method includes the following steps: fixing the water pump 8 on the pump position on the fixed table 3; the impeller of the water pump 8 is clamped by a rotor stopper; applying a voltage greater than the rated voltage of the water pump 8 to the water pump 8; if the preset time period passes, the water pump 8 is not burnt out, and the water pump 8 is qualified; otherwise, the water pump 8 is not qualified.

Alternatively, the voltage applied to the water pump 8 is 1.1 times the rated voltage among the voltages applied to the water pump 8.

The method is beneficial to the smooth implementation of the locked rotor test, and a feasible test method is provided for the locked rotor test.

This embodiment is through carrying out the locked-rotor test to detect the reliability of water pump, provide the assurance for the reliability of the water pump that dispatches from the factory.

In one embodiment, the preset period of time is 15 days.

This embodiment is favorable to guaranteeing qualified water pump 8 security performance under the locked-rotor condition, is favorable to improving the accuracy of test.

In one embodiment, a current sensor is used to monitor the current in the output side of the current transformer 63 to monitor the current in the water pump circuit branch 62 connected to the input side of the current transformer 63, and a buzzer alarms if the monitored current in the water pump circuit branch 62 is greater than the upper current threshold limit.

The current transformer 63 is used for scaling the current, so that the current on the output side of the current transformer is within the flow range of the current sensor, the current sensor works normally, the current value on the output side of the current transformer 63 is accurately displayed, and the current in the water pump circuit branch 62 connected with the input side of the current transformer 63 is accurately acquired.

In the locked rotor testing process, when the water pump 8 is burnt out, the current is large, and if the current transformer 63 is not used, the current sensor arranged in the control device 6 is easy to damage, so that the current transformer 63 is used, and the safety performance of the locked rotor testing method is improved.

The embodiment is beneficial to accurately acquiring the current in the water pump circuit branch 62 and improving the safety performance of the locked rotor test method.

When the monitored current in the branch circuit 62 of the water pump circuit is larger than the upper limit of the current threshold, the buzzer alarms. The buzzer works, so that the alertness of a tester is aroused, unqualified water pumps 8 are removed in time, other water pumps 8 to be tested are replaced, and the safety performance and the working efficiency of the testing system are improved.

The embodiment is beneficial to accurately acquiring the current in the water pump circuit branch 62, improving the safety performance of the locked rotor test method and simultaneously improving the safety performance and the working efficiency of the test system.

In one embodiment, the water pump 8 burns out and a buzzer alarms.

The buzzer works, so that the alertness of a tester is aroused, unqualified water pumps 8 are removed in time, other water pumps 8 to be tested are replaced, and the safety performance and the working efficiency of the testing system are improved.

The embodiment is beneficial to improving the safety performance and the working efficiency of the test system.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.