WO2022135351A1

WO2022135351A1 - Water supply pump inspection method

Info

Publication number: WO2022135351A1
Application number: PCT/CN2021/139787
Authority: WO
Inventors: 大谷贵史; 青木均史
Original assignee: 海尔智家股份有限公司; 青岛海尔电冰箱有限公司; Aqua 株式会社
Priority date: 2020-12-25
Filing date: 2021-12-20
Publication date: 2022-06-30
Also published as: CN116670394A; JP2022101755A

Abstract

A water supply pump (28) inspection method. The water supply pump (28) is provided in an ice maker (25) inside a refrigerator (10) for conveying water from a water supply tank (26) to an ice making disk (27). The inspection method comprises: controlling the water supply pump (28) to operate; and determining the quality of the water supply pump (28) on the basis of a voltage at which the water supply pump (28) operates. On the basis of the voltage at which the water supply pump (28) operates, the quality of the water supply pump (28) is determined, without measuring a water discharge amount of the water supply pump (28). Therefore, the quality of a pump can be simply and efficiently determined.

Description

How to check the water supply pump

technical field

The invention relates to a method for inspecting a water supply water pump, in particular to a method for inspecting a water supply water pump for inspecting the water supply water pump provided in an ice maker of a refrigerator.

Background technique

Among refrigerators in recent years, there is a refrigerator including an automatic ice maker. In this automatic ice maker, a water supply tank and a water supply pump are arranged in the refrigerating compartment, and an ice making tray is arranged in the freezing compartment. When the automatic ice maker makes ice, the water stored in the water supply tank is delivered to the ice making tray by the suction force of the water supply pump, and the water is frozen in the ice making tray, thereby making ice. For example, a refrigerator including an automatic ice maker is described in Patent Document 1 (Japanese Patent Laid-Open No. 2003-014349).

In the manufacturing process of the refrigerator including the automatic ice maker, there is a test process in which the operation of various components included in the refrigerator is confirmed after the assembly process of the refrigerator is completed. In this test process, the operation of the automatic ice maker was also confirmed. Specifically, the operation of the automatic ice maker is confirmed by storing water in the water supply tank, operating the water supply pump, and confirming the flow rate of the water sent by the water supply pump.

However, in the above-mentioned background art, there is room for improvement from the viewpoint of efficiently checking the quality of the ice maker.

Specifically, in order to determine the quality of the ice maker by checking the water discharge volume of the water supply pump, the operator needs to place a measuring device on the discharge side of the water supply pump, and visually confirm the water discharge volume. Such confirmation work is complicated, and there is a problem that it takes a long time.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an inspection method capable of determining the quality of an ice maker without confirming the amount of water discharged.

The inspection method of the water supply pump of the present invention is used for inspecting the water supply pump, which is arranged in the ice maker inside the refrigerator and is used to transport water from the water supply tank to the ice making tray, and is characterized in that, the inspection method includes: controlling the operation of the water supply water pump; and judging the quality of the water supply water pump based on the voltage of the water supply water pump during operation.

In addition, in the inspection method of the water supply pump of the present invention, "controlling the operation of the water supply pump" includes controlling the water supply pump to operate in a forward rotation direction and a reverse rotation direction, and "acting based on the operation of the water supply pump" is characterized in that Judging whether the water supply pump is good or bad by using the voltage at the time of good or bad.

Further, in the inspection method of the water supply pump of the present invention, "controlling the operation of the water supply pump" includes a state in which there is water in the water supply tank and a state in which there is no water in the water supply tank Then, make the water supply pump run in the forward rotation direction and the reverse rotation direction; "judging the quality of the water supply pump based on the voltage of the water supply pump when it is working" includes: the state of water in the water supply tank and in the state where there is no water in the water supply tank, the water supply pump is determined based on the voltage when the water supply pump is operated in the forward rotation direction and the voltage when the water supply pump is operated in the reverse rotation direction good or bad.

In addition, in the inspection method of the water supply pump of the present invention, "determining the quality of the water supply pump based on the voltage when the water supply pump is operating" includes: The voltage value is used to judge the quality of the water supply pump.

Invention effect

The inspection method of the water supply pump of the present invention is used to inspect the water supply pump, the water supply pump is arranged in the ice maker inside the refrigerator to transport water from the water supply tank to the ice making tray, and is characterized in that, the inspection method includes: controlling a The water supply pump is operated; and the quality of the water supply pump is judged based on the voltage of the water supply pump when it is working. Therefore, according to the inspection method of the water supply pump of the present invention, the quality of the water supply pump is determined based on the voltage at the time of operation of the water supply pump, so that it is not necessary to measure the discharge volume of the pump, so even without checking the water discharge volume, it is possible to determine the quality of the ice machine. Bad.

In addition, in the inspection method of the water supply pump of the present invention, "controlling the operation of the water supply pump" includes operating the water supply pump in a forward rotation direction and a reverse rotation direction, and "operating the water supply pump based on the Judging whether the water supply pump is good or bad by using the voltage at the time of good or bad. Therefore, according to the inspection method of the water supply pump of the present invention, the quality of the water supply pump can be determined more accurately by determining whether the water supply pump is good or bad based on the voltage when the water supply pump is operated in the forward rotation direction and the reverse rotation direction.

Moreover, in the inspection method of the water supply pump according to the present invention, "controlling the operation of the water supply pump" includes when there is water in the water supply tank and when there is no water in the water supply tank Then, make the water supply pump work in the forward rotation direction and the reverse rotation direction, "judging the quality of the water supply pump based on the voltage of the water supply pump when it is working" includes: the situation that there is water in the water supply tank down, and in the case where there is no water in the water supply tank, based on the voltage when the water supply pump is operating in the forward direction and the voltage when the water supply pump is operating in the reverse direction, determine the supply The quality of the pump. Therefore, according to the inspection method of the water supply pump of the present invention, when there is water in the water supply tank and when there is no water in the water supply tank, the quality is judged based on the voltage of the water supply pump, thereby in addition to the operation confirmation of the water supply tank In addition, the inspection of the conversion circuit can also be performed.

In addition, in the inspection method of the water supply pump of the present invention, "judging whether the water supply pump is good or bad based on the voltage when the water supply pump is operating" includes: based on the detection by the inverter circuit in the refrigerator. The voltage value, judge the quality of the water supply pump. Therefore, according to the inspection method of the water supply pump of the present invention, by using the inverter circuit in the refrigerator, the inspection can be easily performed using an externally prepared inspection device.

Description of drawings

FIG. 1 is a side cross-sectional view showing a refrigerator according to an embodiment of the present invention.

Fig. 2 is a view showing the refrigerator according to the embodiment of the present invention, and is a perspective view showing the ice maker.

3 is a diagram showing a refrigerator according to an embodiment of the present invention, and is a connection diagram showing a connection structure when the ice maker is tested.

4 is a diagram showing the refrigerator according to the embodiment of the present invention, and is a circuit diagram showing a conversion circuit that converts the current from the water supply pump into a voltage.

5 is a diagram showing the refrigerator according to the embodiment of the present invention, and is a flowchart showing a method of inspecting a water supply pump.

6(A) is a graph showing a change in voltage when the water supply water pump is an acceptable product in the refrigerator according to the embodiment of the present invention and there is water in the water supply tank;

Fig. 6(B) is a graph showing a change in voltage when the water supply water pump is an acceptable product and there is no water in the water supply tank in the refrigerator according to the embodiment of the present invention.

Fig. 7(A) is a graph showing a case where a defective product occurs in a water supply pump and a lead wire is disconnected in the refrigerator according to the embodiment of the present invention;

FIG. 7(B) is a graph showing the case where other lead wires are disconnected;

FIG. 7(C) is a graph showing the case where the leads are connected in opposite directions.

Detailed ways

Hereinafter, the refrigerator 10 which concerns on embodiment of this invention is demonstrated in detail based on drawing. In the description of this embodiment, in principle, the same number is used for the same member, and the overlapping description is omitted. In addition, in the following description, it demonstrates using each direction of up-down, front-back, and left-right, and right and left are the right and left when the refrigerator 10 is seen from the front.

FIG. 1 is a side sectional view showing the refrigerator 10 . The thermal insulation box 11 is composed of an outer box 12, an inner box 13, and a thermal insulation material 14, and the thermal insulation box 11 constitutes the main body of the refrigerator 10. The outer box 12 is composed of a steel plate bent into a predetermined shape, so The inner box 13 is disposed inside the outer box 12 and separated from the outer box 12 , the inner box 13 is made of a synthetic resin board, and the heat insulating material 14 is filled between the outer box 12 and the inner box 13 . Inside the heat insulating box 11, as a storage compartment, a refrigerator compartment 18 and a freezer compartment 19 are formed from above. The refrigerator compartment 18 and the freezer compartment 19 are separated by an insulating partition wall 23 having an insulating structure.

On the inner side of the freezer compartment 19, a cooling compartment 15 is divided and formed. Inside the cooling chamber 15, an evaporator 16 serving as a cooler is provided. Moreover, in the rear of the lower end side of the refrigerator 10, the machine room 20 is partitioned and formed, and the compressor 22 is arrange|positioned in the machine room 20. As shown in FIG. The evaporator 16 and the compressor 22 together with a condenser and an expansion unit not shown here form a refrigerant compression type refrigeration cycle 21 . By operating the refrigeration cycle 21 , the evaporator 16 cools the cool air inside the cooling chamber 15 , and the blower 24 blows the cool air to each storage chamber, whereby the internal temperature of each storage chamber becomes a predetermined cooling temperature range. Specifically, the cool air blown from the blower 24 is blown to the refrigerator compartment 18 and the freezer compartment 19 via an air duct not shown. Moreover, the cool air which cooled the refrigerator compartment 18 and the freezer compartment 19 is returned to the cooling compartment 15 via the return air path which is not shown in figure. With such a structure, the refrigerating compartment 18 is cooled to the refrigerating temperature range, and the freezing compartment 19 is cooled to the freezing temperature range.

Inside the cooling chamber 15 and below the evaporator 16, a defrosting heater 17 is provided. With the operation of the refrigerant compression refrigeration cycle, thick frost is generated on the surface of the evaporator 16 . In this way, the control unit (not shown) stops the compressor 22, closes the cooling chamber 15, and energizes and heats the defrost heater 17, thereby performing the defrosting operation by melting the frost.

The ice maker 25 is a device built in the refrigerator 10 and realizing an automatic ice making function. The ice maker 25 has a water supply tank 26 , a water supply pump 28 and an ice making tray 27 .

The water supply tank 26 is a tank made of a synthetic resin plate that is arranged in the lower part of the refrigerator compartment 18 and stores water for ice making. The user replenishes water (tap water or the like) to the water supply tank 26 .

The water supply pump 28 is arranged near the water supply tank 26 in the refrigerator compartment 18 , and supplies water from the water supply tank 26 to the ice tray 27 .

The ice making tray 27 is arranged in the upper part of the freezing compartment 19 and is a member for freezing water to make ice.

The water supply tank 26 and the water supply pump 28 are connected via a delivery pipe 32 . Further, the water supply pump 28 and the ice making tray 27 are connected via the delivery pipe 31 .

When the ice maker 25 makes ice, first, the user replenishes the water supply tank 26 with water. Next, the water supply pump 28 transfers the water in the water supply tank 26 to the ice tray 27 based on the instruction of the control unit (not shown here). The water in the water supply tank 26 is supplied to the ice tray 27 via the delivery pipe 32 , the water supply pump 28 , and the delivery pipe 31 . When the water supplied to the ice making tray 27 freezes, a de-icing process of releasing ice from the ice making tray 27 is performed. Thus, ice is stored in an ice storage container (not shown here).

FIG. 2 is a perspective view partially showing the ice maker 25 .

The water supply tank 26 has a substantially rectangular parallelepiped shape, and can store water therein. On the rear side of the water supply tank 26 , a water supply pump 28 is arranged, and the water supply tank 26 and the water supply pump 28 are connected via a transfer pipe 32 . Furthermore, the delivery pipe 31 extends downward from the water supply pump 28 .

FIG. 3 is a connection diagram showing a connection structure when a test of the ice maker 25 is performed.

A water supply pump 28 and a conversion circuit 29 are built in the refrigerator 10 . As described above, the water supply pump 28 has a function of conveying water from the water supply tank 26 to the ice making tray 27 using the driving force of the motor. The conversion circuit 29 is a circuit that converts the current supplied to the water supply pump 28 into a voltage when checking the quality of the water supply water pump 28 , and is incorporated in a control board that controls the cooling operation of the refrigerator 10 .

The inspection machine 30 is an external device connected to the refrigerator 10 in the step of inspecting the quality of the refrigerator 10, and is, for example, a small computer in which a predetermined program is incorporated.

The conversion circuit 29 is connected to the inspection machine 30 . The conversion circuit 29 and the inspection machine 30 may be connected by a cable or wirelessly.

FIG. 4 is a circuit diagram showing an example of the conversion circuit 29 that converts the current from the water supply pump 28 into a voltage. The conversion circuit 29 can convert the current input from the water supply pump 28 into a voltage.

One side terminal of the feed pump 28 is connected to the non-inverting input terminal of the operational amplifier 55 via the path 33 . Furthermore, the inverting input terminal of the operational amplifier 55 is grounded via the path 35 , and the resistor 50 is inserted into the path 35 . The connection point 61 of the path 33 and the connection point 60 of the path 35 are connected via the path 34 , and the resistor 51 is inserted into the path 34 . The connection point 63 of the path 35 is connected to the inspection machine 30 via the path 36 . Resistor 52 and resistor 53 are inserted into path 36 .

Operational amplifier 55 is connected to the power supply via path 37 and grounded via path 38 . Furthermore, the connection point 64 of the path 37 and the connection point 62 of the path 38 are connected via the path 39 . Capacitor 56 is inserted into path 39 .

The output terminal of operational amplifier 55 is connected via path 40 to connection point 65 of path 36 .

One end side terminals of the resistor 54 , the capacitor 57 , the capacitor 58 , and the diode 59 are connected to the path 36 , and the other end side terminals are commonly grounded. The resistor 54 , the capacitor 57 , the capacitor 58 , and the diode 59 are elements that stabilize the voltage of the output to the inspection machine 30 .

When the water supply pump 28 is inspected, when the water supply pump 28 is operated, a current flows through the path 33 , and a voltage corresponding to the magnitude of the current is output to the inspection machine 30 via the operational amplifier 55 , the path 40 , the connection point 65 , and the path 36 . . For example, let the current value of the current flowing through the water supply pump 28 be Ip, and the voltage value of the voltage output from the conversion circuit 29 to the inspection machine 30 be Vout, Vout=6.4×Ip. That is, a voltage proportional to the current flowing through the water supply pump 28 is output to the inspection machine 30 via the conversion circuit 29 .

FIG. 5 is a flowchart showing a method of inspecting the water supply pump 28 . In the manufacturing process of the refrigerator 10, the inspection of various components, such as a refrigeration cycle, is performed after an assembly process is complete|finished. The inspection procedure of the water supply pump 28 is one such inspection.

In step S10 , after the assembling process of the refrigerator 10 is completed, the operator connects the inverter circuit 29 to the inspection machine 30 in order to determine the quality of the water supply pump 28 . Specifically, the terminals of the inspection machine 30 are connected to the conversion circuit 29 which is a part of the control board of the refrigerator 10 .

In step S11 , the operator fills the water supply tank 26 with water.

In step S12, based on the instruction|indication of a control apparatus, the water supply pump 28 performs forward rotation operation and reverse rotation operation. That is, the motor, which is a part of the water supply pump 28 , performs forward rotation and reverse rotation.

In step S13, based on the instruction of the control device of the inspection machine 30, the voltage output from the conversion circuit 29 is measured and recorded when the water supply pump 28 is rotated forward and reversely in step S12. Here, the control device is, for example, a control panel included in the refrigerator 10 or a microcomputer included in the inspection machine 30 . In the present embodiment, the operating current of the water supply pump 28 is detected as a voltage by the conversion circuit 29, and the quality of the water supply pump 28 is determined based on the voltage value.

In step S14 , water is drawn from the water supply tank 26 . For example, based on the instruction of the control device on the refrigerator 10 side, the water supply pump 28 is operated until the water stored in the water supply tank 26 is discharged.

In step S15, based on the instruction|indication of a control apparatus, in the state where there is no water in the water supply tank 26, the forward rotation operation and the reverse rotation operation of the water supply pump 28 are controlled.

In step S16, based on the instruction of the control device of the inspection machine 30, the voltage output from the conversion circuit 29 is measured and recorded when the feed pump 28 is rotated forward and reversely in step S15.

In step S17, according to the instruction of the control device of the inspection machine 30, based on the change of the voltage value recorded in the said step S13 and step S16, it is judged whether the water supply pump 28 is good or bad. In addition, after the completion of step S17, the operator may be notified of the quality judgment using notification means such as a display or a speaker.

After the above-mentioned steps are completed, the connection terminals of the inspection machine 30 are removed from the conversion circuit 29 .

After that, if the water supply pump 28 is an acceptable product, the results of other test items are also considered, and the manufacturing process of the refrigerator 10 is completed. On the other hand, if the water supply pump 28 is a defective product, the water supply pump 28 is replaced. Alternatively, if the connection of the water supply pump 28 to the lead wire is not appropriate, the connection of the lead wire is corrected.

FIGS. 6(A) and 6(B) show the above-mentioned water supply pump 28 and its connection in a normal state, FIG. 6(A) is a graph showing a change in voltage when there is water in the water supply tank 26, B) is a graph showing the change in voltage when there is no water in the water supply tank 26 . In the graph shown here, the horizontal axis shows time, and the vertical axis shows the voltage applied to the inspection machine 30 .

Referring to FIG. 6(A), when there is water in the water supply tank 26, the water supply pump 28 is reversely rotated in the period T11, the water supply pump 28 is rotated forward in the period T12, and the water supply pump 28 is reversed in the period T13 . The period other than that is a non-operation period in which the water supply pump 28 does not operate. In this way, the operation of the water supply pump 28 when there is water in the water supply tank 26 can be confirmed, and the water supply amount of the water supply pump 28 can be confirmed. Furthermore, when there is water in the water supply tank 26, by confirming the operation of the water supply pump 28, it can be checked whether the forward rotation and the reverse rotation of the water supply pump 28 are properly switched.

As is apparent from this graph, in any one of the T11 period, the T12 period, and the T13 period, the voltage is higher than the non-operation period. Here, by comparing the voltage in the period T11 and the voltage in the period T12, it is possible to determine whether the water supply pump 28 is good or bad.

An example of a specific good/bad judgment is described. The water supply pump 28 flows a current of 0.05A to 0.16A under no load, and flows a current of 0.2A to 0.5A under a rated load. On the other hand, the output voltage of the conversion circuit 29 is 6.4 times the current flowing in the water supply pump 28 . Therefore, when there is no load, the output voltage of the conversion circuit 29 is 0.32V to 1.02V, and when the load is rated, the output voltage of the conversion circuit 29 is 1.28V to 3.2V. The inspection machine 30 determines the quality of the water supply pump 28 based on the voltage value.

For example, if the peak voltage in the period T11 (no load on the water supply pump 28 ) is lower than the peak voltage in the period T12 (when the water supply pump 28 is under rated load), the water supply pump 28 can be determined to be an acceptable product. That is, the feed water pump 28 is not faulty and the wiring to the feed water pump 28 is correct. In addition, it can be confirmed that the signal for switching the forward rotation and the reverse rotation of the water supply pump 28 is correctly output.

6(A) , when the peak voltage during T12 (when the water supply pump 28 is at the rated load) is equal to or higher than a predetermined threshold voltage (eg, 1.2 V), the water supply pump 28 can be determined to be an acceptable product.

In addition, if the voltage value when the water supply pump 28 is rotated forward or reversely is higher than the voltage value when the water supply pump 28 is stopped, it can be determined that the water supply pump 28 is an acceptable product. For example, referring to FIG. 6(A) , if the voltage in the period T11 is higher than the voltage between the period T11 and the period T12, it can be determined that the water supply pump 28 is an acceptable product.

Here, any one of the above-mentioned determinations may be used, or two or more of them may be used.

Referring to FIG. 6(B), when there is no water in the water supply tank 26, the water supply pump 28 is reversely rotated during the period T21, the forward rotation of the water supply pump 28 is caused during the period T22, and the water supply pump is caused to rotate during the period T23. 28 reverse. In this way, the operation of the water supply pump 28 when there is no water in the water supply tank 26 can be confirmed.

Here, it is also possible to determine whether the water supply tank 26 is good or bad based on the peak voltage during the forward rotation period T22 of the water supply pump 28 .

For example, when the peak voltage during T22 (when the water supply pump 28 becomes no-load) is less than a predetermined threshold voltage (eg, 1.2 V), it can be determined that the water supply pump 28 is an acceptable product. Furthermore, by performing the inspection in a state where the water supply pump 28 is empty, it is possible to check whether or not there is no water in the water supply tank 26 when the refrigerator 10 is shipped from the factory. At the same time, the function of the conversion circuit 29 can also be checked.

Fig. 7(A) is a graph showing a case where a lead wire is disconnected, Fig. 7(B) is a graph showing a case where another lead wire is disconnected, and Fig. 7(C) is a graph showing a case where the wires are connected in reverse. In the case shown in these figures, at the same timing as in the case of FIG. 6(A) , a control signal is inputted from the control device to the water supply pump 28 for forward rotation and reverse rotation of the water supply pump 28 run.

Referring to FIG. 7(A), here, the water supply pump 28 does not operate, and no change is seen in the voltage value. The reason for this is disconnection of the lead wire connected to the water supply pump 28 for supplying electric power, or damage to the control board or circuit elements in which the above-described conversion circuit 29 is incorporated.

Referring to Fig. 7(B) , here, in all of the period T31, the period T32, and the period T33, the water supply pump 28 is reversed, and the water supply from the water supply tank 26 is not performed at all. The reason for this is the same as in the case of FIG. 7(A), and is the breakage of the lead wire, the control board, or the circuit element.

Referring to FIG. 7(C), here, the water supply pump 28 does not operate, and no change is seen in the voltage value. The reason for this is that the lead wires are connected oppositely with respect to the water supply pump 28 .

As described above, when there is water in the water supply tank 26 or when there is no water, by rotating the water supply pump 28 forward and reversely, the quality of the water supply pump 28 and its connection state can be accurately determined.

According to the present embodiment described above, the following main effects can be achieved.

That is, it is possible to judge whether the ice maker is good or bad without confirming the water discharge amount. Specifically, since the quality of the water supply pump 28 is determined based on the voltage at the time of operation of the water supply pump 28, it is not necessary to measure the discharge amount of the pump, and thus the quality of the pump can be easily determined.

In addition, by judging whether the water supply pump 28 is good or bad based on the voltage when the water supply pump 28 is operated in the forward rotation direction and the reverse rotation direction, the inspection of the water supply pump 28 can be performed, and the connection of the water supply pump 28 can also be accurately determined. good or bad condition.

In addition, when there is water in the water supply tank 26 or when there is no water in the water supply tank 26, the quality of the water supply pump 28 can be determined based on the voltage of the water supply pump 28. In addition, the inspection of the conversion circuit 29 can also be performed at the same time.

By using the conversion circuit 29 included in the refrigerator 10, the inspection can be easily performed using an externally prepared inspection device.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, referring to FIG. 1 , when water is supplied from the water supply tank 26 to the ice tray 27 , the reverse rotation operation, the forward rotation operation, and the reverse rotation operation of the water supply pump 28 can be performed based on an instruction from the control unit. By the first reverse operation, the accumulated water existing at the front end of the conveying pipe 31 was sucked up. In addition, in a state where the air is passed through the inside of the conveying pipe 31 , water is supplied from the water supply tank 26 to the ice tray 27 by the forward rotation operation. In addition, through the second reversal operation, the siphon phenomenon does not occur. In this way, it is possible to suppress a situation in which the water melted by the in-line heater (not shown) remains in the vicinity of the front end portion of the conveying pipe 31, and when the forward rotation is performed in the initial operation, it is located inside the conveying pipe 31. The air is compressed, and the water accumulated at the front end suddenly scatters.

Claims

A method for inspecting a water supply pump, wherein the water supply pump is provided in an ice maker inside a refrigerator, and the water supply pump is used to transport water from a water supply tank to an ice making tray, wherein the inspection method includes:

controlling the operation of the water supply pump; and

The quality of the water supply pump is judged based on the voltage when the water supply pump is operating.
The inspection method of the water supply pump according to claim 1, wherein,

"Controlling the operation of the water supply pump" includes:

Control the water supply pump to run in the forward direction and the reverse direction,

"Determining the quality of the water supply pump based on the voltage when the water supply pump is operating" includes: based on the voltage when the water supply pump is operating in the forward rotation direction and the voltage when the water supply pump is operating in the reverse rotation direction , to judge the quality of the water supply pump.
The inspection method of the water supply pump according to claim 1, wherein,

"Controlling the operation of the water supply pump" includes:

in a state in which there is water in the water supply tank, and in a state in which there is no water in the water supply tank, controlling the water supply pump to operate in a forward rotation direction and a reverse rotation direction,

"Determining the quality of the water supply pump based on the voltage when the water supply pump is operating" includes: in a state in which there is water in the water supply tank, and in a state in which there is no water in the water supply tank, based on the water supply The voltage when the water pump is running in the forward rotation direction and the voltage when the water supply pump is running in the reverse direction is used to determine whether the water supply pump is good or bad.
The inspection method of the water supply pump according to any one of claims 1 to 3, wherein "judging the quality of the water supply pump based on the voltage when the water supply pump is operating" comprises: The voltage value detected by the conversion circuit is used to judge the quality of the water supply pump.
The inspection method for a water supply pump according to claim 3, wherein "judging whether the water supply pump is good or bad based on the voltage when the water supply pump is operating" comprises: in a state where there is water in the water supply tank, If the peak voltage during the reverse rotation of the water supply pump with no load is lower than the peak voltage during the forward rotation when the water supply pump is under rated load, the water supply pump is determined to be qualified.
The inspection method for a water supply pump according to claim 3, wherein "judging the quality of the water supply pump based on the voltage when the water supply pump is running" comprises:

In the state that there is water in the water supply tank, if the peak voltage of the water supply pump during the forward rotation of the water supply pump at rated load is greater than the threshold voltage, the water supply pump is determined to be qualified.
The inspection method for a water supply pump according to claim 3, wherein "judging the quality of the water supply pump based on the voltage when the water supply pump is running" comprises:

In the state of no water in the water supply tank, if the peak voltage during the forward rotation of the water supply pump is less than a threshold voltage when the water supply pump has no load, it is determined that the water supply pump is qualified.
The inspection method for a water supply pump according to claim 3, wherein "judging the quality of the water supply pump based on the voltage when the water supply pump is running" comprises:

If the voltage value does not change, it is determined that the electric wire connected to the water supply pump is disconnected or the control board or circuit components are damaged.
The inspection method for a water supply pump according to claim 3, wherein "judging the quality of the water supply pump based on the voltage when the water supply pump is running" comprises:

If the voltage value does not change, it can be determined that the lead wire is connected inversely with respect to the water supply pump.
The inspection method for a water supply pump according to claim 3, wherein "judging the quality of the water supply pump based on the voltage when the water supply pump is running" comprises:

If the water supply pump is reversed at all times and does not supply water from the water supply tank, it is determined that the electric wire connected to the water supply pump is disconnected or the control board or circuit element is damaged.