CN116670394A - Inspection method of water supply pump - Google Patents

Abstract

An inspection method of a water supply pump (28), the water supply pump (28) being provided in an ice maker (25) inside a refrigerator (10) for delivering water from a water supply tank (26) to an ice making tray (27), the inspection method comprising: controlling the operation of a water supply pump (28); and judging whether the water supply pump (28) is good or bad based on the voltage when the water supply pump (28) is operated. The quality of the water supply pump (28) is judged based on the voltage of the water supply pump (28) when the water supply pump is operated, and the water discharge amount of the water supply pump (28) is not required to be measured, so that the quality of the pump can be simply judged.

Description

How to check the water supply pump technical field

The invention relates to a method for checking a water supply pump, in particular to a method for checking a water supply pump installed in an ice maker of a refrigerator.

Background technique

Among refrigerators in recent years, there are refrigerators including automatic ice makers. In this automatic ice maker, a water supply tank and a water supply pump are arranged in the refrigerator compartment, and an ice tray is arranged in the freezer compartment. When the automatic ice maker is making ice, the water stored in the water supply tank is transported 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, Patent Document 1 (Japanese Unexamined Patent Publication No. 2003-014349) describes a refrigerator including an automatic ice maker.

In the manufacturing process of a refrigerator including an automatic ice maker, there is a test process in which the operation of various constituent devices included in the refrigerator is confirmed after the assembly process of the refrigerator is completed. In this test procedure, the operation of the automatic ice maker was also confirmed. Specifically, water is stored in the water supply tank, the water supply pump is operated, and the flow rate of the water supplied by the water supply pump is confirmed, thereby confirming the operation of the automatic ice maker.

However, in the background art described above, there is room for improvement from the viewpoint of efficiently confirming whether the ice machine is good or bad.

Specifically, when determining whether the ice machine is good or bad by checking the discharge of the water supply pump, the operator needs to place a measuring device on the discharge side of the water supply pump and visually check the discharge of the water supply. There is a problem that such confirmation work is complicated and takes a long time.

Contents of the invention

The present invention was made in view of the above circumstances, and an object of the present invention is to provide an inspection method capable of judging the quality of an ice machine without checking the amount of water discharged.

The inspection method of the water supply pump of the present invention is used to inspect the water supply pump, and the water supply pump is arranged in the ice maker inside the refrigerator for transporting water from the water supply tank to the ice making tray, and it is characterized in that the inspection method includes: controlling the operation of the water supply pump; and judging whether the water supply pump is good or not based on the voltage of the water supply pump when it is working.

In addition, in the inspection method of the water supply pump of the present invention, it is characterized in that "controlling the operation of the water supply pump" includes: controlling the operation of the water supply pump in the forward direction and the reverse direction, "based on the operation of the water supply pump Judging whether the water supply pump is good or not based on the voltage when the water supply pump is running in the forward direction and the voltage when the water supply pump is running in the reverse direction, judging whether the water supply pump good or bad.

In addition, in the inspection method of the water supply pump of the present invention, it is characterized in that "controlling the operation of the water supply pump" includes: a state where there is water in the water supply tank, and a state where there is no water in the water supply tank Next, make the water supply pump run in forward direction and reverse direction; "judging whether the water supply pump is good or bad based on the voltage when the water supply pump is working" includes: there is water in the water supply tank , and in a state where there is no water in the water supply tank, it is judged that the water supply pump good or bad.

In addition, in the inspection method of the water supply pump of the present invention, it is characterized in that "judging the quality of the water supply pump based on the voltage of the water supply pump when it is working" includes: based on the voltage detected by the conversion circuit in the refrigerator The voltage value is used to judge whether the water supply pump is good or bad.

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 installed in the ice maker inside the refrigerator to transport water from the water supply tank to the ice making tray. It is characterized in that the inspection method includes: controlling the the operation of the water supply pump; and judging whether the water supply pump is good or bad 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, it is judged whether the water supply pump is good or bad based on the voltage when the water supply pump is in operation, so that it is not necessary to measure the discharge volume of the pump, so even if the discharge volume is not confirmed, the quality of the ice machine can be judged. bad.

In addition, in the inspection method of the water supply pump of the present invention, it is characterized in that "controlling the operation of the water supply pump" includes: making the water supply pump work in the forward direction and the reverse direction, "based on the operation of the water supply pump Judging whether the water supply pump is good or not based on the voltage when the water supply pump is running in the forward direction and the voltage when the water supply pump is running in the reverse direction, judging whether the water supply pump 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 based on the voltage when the water supply pump is operated in the forward direction and the reverse direction, thereby making it possible to more accurately determine whether it is good or bad.

In addition, in the inspection method of the water supply pump of the present invention, it is characterized in that "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 Next, make the water supply pump work in the forward direction and the reverse direction, "judging the quality of the water supply pump based on the voltage when the water supply pump is working" includes: when there is water in the water supply tank , and when there is no water in the water supply tank, the water supply stage is judged based on the voltage when the water supply pump is running in the The water pump is good or bad. 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, it is judged whether it is good or bad based on the voltage of the water supply pump, thereby in addition to the work confirmation of the water supply tank In addition, inspection of the conversion circuit can also be performed.

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

Description of drawings

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

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

Fig. 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 an ice maker is tested.

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

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

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

Fig. 6(B) is a graph showing changes in voltage when the water supply 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 situation where a defective product is produced 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 a situation where other leads are disconnected;

FIG. 7(C) is a diagram showing a case where lead wires are reversely connected.

Detailed ways

Hereinafter, refrigerator 10 according to the embodiment of the present invention will be described in detail based on the drawings. In the description of this embodiment, in principle, the same reference numerals are used for the same members, and overlapping descriptions are omitted. In addition, in the following description, it demonstrates using each direction of up, down, front, back, and left and right, and left and right are left and right when refrigerator 10 is seen from the front.

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

On the inner side of the freezer compartment 19, a cooling compartment 15 is formed. Inside the cooling chamber 15, an evaporator 16 as a cooler is provided. Further, a machine room 20 is defined behind the lower end side of the refrigerator 10 , and a compressor 22 is arranged in the machine room 20 . The evaporator 16 and the compressor 22 form a refrigerant compression type refrigeration cycle 21 together with a condenser and an expansion unit not shown here. By operating the refrigerating cycle 21, the evaporator 16 cools the cold air inside the cooling room 15, and the blower 24 blows the cold air into each storage room, whereby the internal temperature of each storage room falls within a predetermined cooling temperature range. Specifically, cool air blown from air blower 24 is blown to refrigerator compartment 18 and freezer compartment 19 via an unillustrated air supply path. Moreover, the cold air which cooled the refrigerator compartment 18 and the freezer compartment 19 returns to the cooling compartment 15 through the return air path which is not shown in figure. With such a structure, the refrigerator compartment 18 is cooled to the refrigeration temperature range, and the freezer 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. As the refrigerant compression refrigerating cycle operates, 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 to perform a defrosting operation to melt the frost.

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

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

Water supply pump 28 is disposed near water supply tank 26 inside refrigerator compartment 18 , and sends water from water supply tank 26 to ice tray 27 .

Ice tray 27 is disposed above freezer compartment 19 and is used to freeze water to make ice.

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

When the ice maker 25 is making ice, first, the user replenishes water to the water supply tank 26 . Next, water supply pump 28 transfers the water in water supply tank 26 to ice tray 27 based on an instruction from a 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 deicing process of separating ice from the ice making tray 27 is performed. Thereby, 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. A water supply pump 28 is arranged on the rear side of the water supply tank 26 , and the water supply tank 26 and the water supply pump 28 are connected via a delivery pipe 32 . Furthermore, a delivery pipe 31 extends downward from the water supply pump 28 .

FIG. 3 is a connection diagram showing a connection structure when the ice maker 25 is tested.

A water supply pump 28 and a conversion circuit 29 are incorporated in the refrigerator 10 . As described above, the water supply pump 28 has a function of delivering 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 for converting the current supplied to the water supply pump 28 into a voltage when checking whether the water supply pump 28 is good or bad, and is built into 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 via a connection line or wirelessly.

FIG. 4 is a circuit diagram showing an example of a 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 terminal of the water supply 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 . Connection point 61 of path 33 and connection point 60 of path 35 are connected via path 34 , and resistance 51 is inserted into 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 to ground 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, capacitor 57, capacitor 58, and diode 59 are connected to the path 36, while the other end-side terminals are commonly grounded. The resistor 54 , the capacitor 57 , the capacitor 58 and the diode 59 are elements for stabilizing the voltage 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 through the operational amplifier 55, the path 40, the connection point 65, and the path 36. . For example, assuming that the current value of the current flowing through the water supply pump 28 is Ip, and the voltage value of the voltage output from the conversion circuit 29 to the inspection machine 30 is 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 illustrating a method of inspecting the water supply pump 28 . In the manufacturing process of refrigerator 10 , after the assembly process is completed, inspections of various constituent devices such as the refrigeration cycle are performed. The inspection step of the feed water pump 28 is one of such inspections.

In step S10 , after the assembly process of refrigerator 10 is completed, the worker connects inverter circuit 29 to inspection machine 30 in order to determine whether water supply pump 28 is good or bad. 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 worker pours water into the water supply tank 26 .

In step S12, based on an instruction from the control device, the water supply pump 28 performs forward rotation and reverse rotation. That is, the motor performs forward rotation and reverse rotation, and the motor is a part of the water supply pump 28 .

In step S13, based on the instruction of the control device of the inspection machine 30, the voltage output by the conversion circuit 29 when the water supply pump 28 rotates forward and reverse in step S12 is measured and recorded. 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 this 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 pumped from the water supply tank 26 . For example, the water supply pump 28 is operated until the water stored in the water supply tank 26 is drained based on an instruction from the control device on the side of the refrigerator 10 .

In step S15, based on the instruction of the control device, in the state where there is no water in the water supply tank 26, the normal operation and the reverse 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 by the conversion circuit 29 when the water supply pump 28 rotates forward and reverse in step S15 is measured and recorded.

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

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

Thereafter, if the water supply pump 28 is an acceptable product, the manufacturing process of the refrigerator 10 is completed in consideration of the results of other test items. On the other hand, if the water supply pump 28 is a defective product, the water supply pump 28 is replaced. Alternatively, if the feed water pump 28 is improperly connected to the lead wires, correct the lead wire connections.

Fig. 6 (A) and Fig. 6 (B) have shown the situation that above-mentioned water supply pump 28 and its connection are normal, Fig. 6 (A) is the graph showing the variation of the voltage when there is water in the water supply tank 26, Fig. 6 ( B) is a graph showing changes 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, during T11, the water supply pump 28 reverses, during T12, the water supply pump 28 forwards, during T13, the water supply pump 28 reverses . The other periods are non-operating periods in which the water supply pump 28 is not in operation. In this way, the operation of the water supply pump 28 when water is present in the water supply tank 26 can be confirmed, and the water supply amount of the water supply pump 28 can be confirmed. Also, by confirming the operation of the water supply pump 28 when there is water in the water supply tank 26, it can be checked whether the normal rotation and the reverse rotation of the water supply pump 28 are switched correctly.

As is apparent from the graph, the voltage is higher than the non-operation period in any of the T11 period, T12 period, and T13 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 specific good/bad judgment has been 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-1.02V, and when the load is rated, the output voltage of the conversion circuit 29 is 1.28V-3.2V. The inspection machine 30 judges whether the water supply pump 28 is good or bad based on this voltage value.

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

Also, referring to FIG. 6(A), if the peak voltage during T12 (the water supply pump 28 is a rated load) is greater than or equal to a predetermined threshold voltage (for example, 1.2V), it can be determined that the water supply pump 28 is a good product.

Moreover, if the voltage value at the time of forward rotation or reverse rotation of the water supply pump 28 is higher than the voltage value at the time of the stop of the water supply pump 28, it can be judged that the water supply pump 28 is a good product. For example, referring to FIG. 6(A), if the voltage during T11 is higher than the voltage between T11 and T12, it can be determined that water supply pump 28 is a good product.

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

Referring to Fig. 6 (B), in the case that there is no water in the water supply tank 26, the water supply pump 28 is reversed during the T21 period, the water supply pump 28 is forwardly rotated during the T22 period, and the water supply pump 28 is turned forward during the T23 period. 28 reversed. In this way, it is possible to confirm the operation of the water supply pump 28 when there is no water in the water supply tank 26 .

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

For example, if the peak voltage during T22 (the water supply pump 28 becomes unloaded) is lower than a predetermined threshold voltage (for example, 1.2V), it can be determined that the water supply pump 28 is a good product. In addition, by performing inspection in a state where water is not present in water supply pump 28 , it is possible to inspect whether or not there is no water in water supply tank 26 when refrigerator 10 is shipped. 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 a lead wire is reversely connected. In the case shown in these graphs, at the same timing as in the case of FIG. 6(A), a control signal is input to the water supply pump 28 from the control device. The control signal is used to make the water supply pump 28 run forward and reverse. run.

Referring to FIG. 7(A), here, the water supply pump 28 is not operated, and no change is seen in the voltage value. This is caused by a disconnection of a lead wire connected to the water supply pump 28 for supplying electric power, or damage to a control board or a circuit element incorporating the conversion circuit 29 described above.

Referring to FIG. 7(B), here, during all periods T31, T32, and T33, the water supply pump 28 is reversed, and water supply from the water supply tank 26 is not performed at all. The cause is the same as in the case of FIG. 7(A), and is damage to the lead wires, the control board, or the circuit components.

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

As described above, it is possible to accurately determine whether the water supply pump 28 and its connection status are good or bad by rotating the water supply pump 28 forward and reverse when there is water in the water supply tank 26 or when there is no water.

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

That is, it is possible to judge whether the ice machine is good or bad without checking the displacement. Specifically, since the quality of the water supply pump 28 is determined based on the voltage when the water supply pump 28 is in operation, it is not necessary to measure the displacement of the pump, so the quality of the pump can be easily determined.

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

In addition, by judging the quality of the water supply pump 28 based on the voltage of the water supply pump 28 when there is water in the water supply tank 26 and when there is no water in the water supply tank 26, the quality of the water supply pump 28 can be determined in each of these states, 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, inspection can be easily performed using an externally prepared inspection device.

The present invention is not limited to the above-described embodiments, and various changes and implementations are possible without departing from the gist of the present invention.

For example, referring to FIG. 1 , when water is supplied from water supply tank 26 to ice tray 27 , reverse rotation, forward rotation, and reverse rotation of water supply pump 28 can be performed based on instructions from the control unit. The stagnant water present at the tip of the delivery pipe 31 is sucked by the initial reverse operation. In addition, water is supplied from the water supply tank 26 to the ice tray 27 by normal rotation operation in a state where air is passed through the inside of the delivery pipe 31 . In addition, by the second reverse operation, the siphon phenomenon does not occur. In this way, it is possible to suppress the situation that, when the water melted by the duct heater (not shown) remains near the front end of the delivery pipe 31, if the normal rotation is performed in the initial operation, the water inside the delivery pipe 31 The air in the air is compressed, and the water accumulated at the front end is suddenly scattered.

Claims (10)

An inspection method of a water supply pump, the water supply pump is installed 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 in operation. The inspection method of the water supply pump according to claim 1, characterized in that: "Controlling the operation of the water supply pump" includes: control the water supply pump to run in the forward direction and the reverse direction, "Judge whether the water supply pump is good or bad based on the voltage when the water supply pump is running" includes: based on the voltage when the water supply pump is running in the forward direction and the voltage when the water supply pump is running in the reverse direction , to judge whether the water supply pump is good or bad. The inspection method of the water supply pump according to claim 1, characterized in that: "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, control the water supply pump to run in the forward direction and the reverse direction, "Judge whether the water supply pump is good or bad based on the voltage when the water supply pump is running" includes: when there is water in the water supply tank and when there is no water in the water supply tank, based on the The voltage when the water pump is running in the forward direction and the voltage when the water supply pump is running in the reverse direction 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, characterized in that "judging whether the water supply pump is good or not based on the voltage of the water supply pump when it is running" includes: The voltage value detected by the conversion circuit is used to judge whether the water supply pump is good or bad. The inspection method of the 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 running" comprises: when there is water in the water supply tank, If the peak voltage of the water supply pump during reverse rotation with no load is lower than the peak voltage of the water supply pump with rated load during forward rotation, it is determined that the water supply pump is qualified. The inspection method of the 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 running" includes: In the state that there is water in the water supply tank, if the peak voltage of the water supply pump is greater than the threshold voltage during the forward rotation of the water supply pump at rated load, it is determined that the water supply pump is qualified. The inspection method of the 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 running" includes: When the water supply tank is empty of water, if the peak voltage of the water supply pump during forward rotation without load is less than a threshold voltage, it is determined that the water supply pump is qualified. The inspection method of the 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 running" includes: If the voltage value does not change, it is determined that the wire connected to the water supply pump is disconnected or the control board or circuit components are damaged. The inspection method of the 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 running" includes: If the voltage value does not change, it can be determined that the lead wire is reversely connected to the water supply pump. The inspection method of the 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 running" includes: 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 broken or the control board or circuit elements are damaged.