Method for inspecting a water supply pump

Abstract

An inspection method of a water supply pump (28) provided in an ice maker (25) inside a refrigerator (10) for delivering water from a water supply tank (26) to an ice tray (27), the inspection method including: controlling the water supply pump (28) to operate; and determining the soundness of the water supply pump (28) based on a voltage at the time of operation of the water supply pump (28). The soundness of the water supply pump (28) is determined based on the voltage at the time of operation of the water supply pump (28), so that it is not necessary to measure the discharge amount of the water supply pump (28), and thus the soundness of the pump can be easily determined.

Description

Technical Field

[0001] This invention relates to a method for inspecting a water supply pump, and more particularly to a method for inspecting a water supply pump installed in an ice maker of a refrigerator. Background Technology

[0002] Refrigerators that have been introduced in recent years include those that include an automatic ice maker. In this automatic ice maker, a water tank and a water pump are installed in the refrigerator compartment, and an ice-making tray is installed in the freezer compartment. When the automatic ice maker makes ice, water stored in the water tank is pumped to the ice-making tray by the suction of the water pump, where the water freezes, thus producing ice. For example, a refrigerator including an automatic ice maker is described in Patent Document 1 (Japanese Patent Application Publication No. 2003-014349).

[0003] In the manufacturing process of a refrigerator, including an automatic ice maker, there is a testing process where, after the refrigerator assembly process is completed, the operation of the various constituent devices included in the refrigerator is confirmed. The operation of the automatic ice maker is also confirmed in this testing process. Specifically, water is stored in a water tank, the water supply pump is operated, and the flow rate of water delivered by the water supply pump is confirmed, thereby confirming the operation of the automatic ice maker.

[0004] However, in the aforementioned background technology, from the perspective of efficiently confirming the quality of an ice maker, there is room for improvement.

[0005] Specifically, when determining the quality of an ice maker by checking the drainage 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 drainage volume. This confirmation process is cumbersome and time-consuming. Summary of the Invention

[0006] The present invention was made in view of the above circumstances, and the object of the present invention is to provide an inspection method that can determine the quality of an ice maker even without confirming the amount of water drained.

[0007] The present invention provides a method for inspecting a water supply pump, wherein the water supply pump is installed in an ice maker inside a refrigerator to deliver water from a water tank to an ice maker. The method is characterized in that the inspection method includes: controlling the operation of the water supply pump; and determining the condition of the water supply pump based on the voltage at which the water supply pump is operating.

[0008] Furthermore, in the method for inspecting the water supply pump of the present invention, the method is characterized in that "controlling the operation of the water supply pump" includes: controlling the water supply pump to operate in the forward and reverse directions, and "judging the condition of the water supply pump based on the voltage when the water supply pump is operating" includes: judging the condition of the water supply pump 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.

[0009] Furthermore, in the method for inspecting the water supply pump of the present invention, the method is characterized in that "controlling the operation of the water supply pump" includes: operating the water supply pump in a forward direction and a reverse direction when the water supply tank contains water and when the water supply tank does not contain water; and "judging the condition of the water supply pump based on the voltage when the water supply pump is operating" includes: judging the condition of the water supply pump 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, when the water supply tank contains water and when the water supply tank does not contain water.

[0010] Furthermore, in the method for inspecting the water supply pump of the present invention, the feature is that "judging the quality of the water supply pump based on the voltage when the water supply pump is operating" includes: judging the quality of the water supply pump based on the voltage value detected by the conversion circuit in the refrigerator.

[0011] Invention Effects

[0012] The present invention provides a method for inspecting a water supply pump installed in an ice maker inside a refrigerator to deliver water from a water tank to an ice-making tray. The method is characterized by comprising: controlling the operation of the water supply pump; and determining the condition of the water supply pump based on the voltage during operation. Therefore, according to the present invention, the method for inspecting the water supply pump determines its condition based on the voltage during operation, thereby eliminating the need to measure the pump's drainage volume. Thus, the condition of the ice maker can be determined even without confirming the drainage volume.

[0013] Furthermore, in the water pump inspection method of the present invention, the method is characterized in that "controlling the operation of the water pump" includes: making the water pump operate in both forward and reverse directions; and "determining the condition of the water pump based on the voltage during operation" includes: determining the condition of the water pump based on the voltage during forward operation and the voltage during reverse operation. Therefore, according to the water pump inspection method of the present invention, determining the condition of the water pump based on the voltage during forward and reverse operation allows for a more accurate determination of its condition.

[0014] Furthermore, in the water pump inspection method of the present invention, the following features are evident: "controlling the operation of the water pump" includes: operating the water pump in both forward and reverse directions when there is water in the water tank and when there is no water in the water tank; "determining the condition of the water pump based on the voltage during operation" includes: determining the condition of the water pump based on the voltage during forward operation and the voltage during reverse operation, when there is water in the water tank and when there is no water in the water tank. Therefore, according to the water pump inspection method of the present invention, the condition of the water pump is determined based on its voltage when there is water in the water tank and when there is no water in the water tank, thereby enabling not only the confirmation of the operation of the water tank but also the inspection of the switching circuit.

[0015] Furthermore, in the water pump inspection method of the present invention, the feature is that "determining the condition of the water pump based on the voltage during operation" includes: determining the condition of the water pump based on the voltage value detected by the conversion circuit in the refrigerator. Therefore, according to the water pump inspection method of the present invention, by using the conversion circuit in the refrigerator, inspection can be easily performed using an externally prepared inspection device. Attached Figure Description

[0016] Figure 1 This is a side sectional view showing a refrigerator according to an embodiment of the present invention.

[0017] Figure 2 This is a diagram showing a refrigerator according to an embodiment of the present invention, and a perspective view showing an ice maker.

[0018] Figure 3 This is a diagram showing a refrigerator according to an embodiment of the present invention, and a connection diagram showing the connection structure during the testing of an ice maker.

[0019] Figure 4 This is a diagram showing a refrigerator according to an embodiment of the present invention, and a circuit diagram showing a conversion circuit that converts current from a water pump into voltage.

[0020] Figure 5 This is a diagram showing a refrigerator according to an embodiment of the present invention, and a flowchart showing a method for inspecting a water supply pump.

[0021] Figure 6(A) is a graph showing the voltage change when the water pump in the refrigerator of the embodiment of the present invention is a qualified product and there is water in the water tank;

[0022] Figure 6(B) is a graph showing the voltage change when the water pump in the refrigerator of the embodiment of the present invention is a qualified product and there is no water in the water tank.

[0023] Figure 7(A) is a graph showing a situation in which the water supply pump produces defective products and the lead wire breaks in the refrigerator according to an embodiment of the present invention;

[0024] Figure 7(B) is a diagram showing other cases of lead wire breakage;

[0025] Figure 7(C) is a diagram showing the case where the leads are connected in opposite directions. Detailed Implementation

[0026] Hereinafter, a refrigerator 10 according to an embodiment of the present invention will be described in detail based on the accompanying drawings. In the description of this embodiment, the same number will be used for the same component in principle, and repeated descriptions will be omitted. Furthermore, in the following description, the directions of up, down, front, back, left, and right will be used for description, with left and right referring to the left and right when viewing the refrigerator 10 from the front.

[0027] Figure 1 This is a side sectional view of the refrigerator 10. The insulated housing 11 consists of an outer casing 12, an inner casing 13, and insulation material 14. The insulated housing 11 forms the main body of the refrigerator 10. The outer casing 12 is made of steel plate bent into a predetermined shape. The inner casing 13 is disposed inside the outer casing 12 and separated from it. The inner casing 13 is made of synthetic resin board. The insulation material 14 fills the space between the outer casing 12 and the inner casing 13. Inside the insulated housing 11, a refrigerator compartment 18 and a freezer compartment 19 are formed from top to bottom as storage compartments. The refrigerator compartment 18 and the freezer compartment 19 are separated by an insulated partition wall 23, which has an insulated structure.

[0028] A cooling compartment 15 is formed inside the freezer compartment 19. An evaporator 16, acting as a cooler, is installed inside the cooling compartment 15. Furthermore, a machine compartment 20 is formed at the lower rear side of the refrigerator 10, and a compressor 22 is arranged in the machine compartment 20. The evaporator 16 and compressor 22, together with a condenser and expansion unit (not shown), form a refrigerant compression refrigeration cycle 21. By operating the refrigeration cycle 21, the evaporator 16 cools the cold air inside the cooling compartment 15, and a blower 24 blows this cold air to each storage compartment, thereby setting the internal temperature of each storage compartment to a predetermined cooling temperature range. Specifically, the cold air blown from the blower 24 is blown to the refrigerator compartment 18 and the freezer compartment 19 via an airflow path (not shown). Furthermore, the cold air cooled in the refrigerator compartment 18 and the freezer compartment 19 returns to the cooling compartment 15 via a return airflow path (not shown). Using this structure, the refrigerator compartment 18 is cooled to the refrigerator temperature range, and the freezer compartment 19 is cooled to the freezer temperature range.

[0029] A defrost heater 17 is provided inside the cooling chamber 15 and below the evaporator 16. As the refrigerant compression refrigeration cycle operates, thick frost forms on the surface of the evaporator 16. Thus, a control unit (not shown) stops the compressor 22, closes the cooling chamber 15, and energizes the defrost heater 17 to heat it, thereby performing a defrosting operation to melt the frost.

[0030] Ice maker 25 is a device built into refrigerator 10 and has an automatic ice-making function. Ice maker 25 has a water tank 26, a water pump 28, and an ice tray 27.

[0031] Water supply tank 26 is a tank made of synthetic resin board located at the bottom of the cold storage compartment 18, used to store water for ice making. Users replenish water (tap water, etc.) to water supply tank 26.

[0032] The water supply pump 28 is located inside the cold storage compartment 18 near the water supply tank 26, and supplies water from the water supply tank 26 to the ice tray 27.

[0033] The ice tray 27 is a component located on the upper part of the freezer compartment 19 and is used to freeze water to make ice.

[0034] Water tank 26 and water pump 28 are connected via delivery pipe 32. In addition, water pump 28 and ice tray 27 are connected via delivery pipe 31.

[0035] When the ice maker 25 makes ice, firstly, the user adds water to the water supply tank 26. Then, based on instructions from the control unit (not shown), the water supply pump 28 transfers water from the water supply tank 26 to the ice-making tray 27. The water in the water supply tank 26 is supplied to the ice-making 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 is performed to detach the ice from the ice-making tray 27. Thus, ice is stored in an ice storage container (not shown).

[0036] Figure 2 This is a perspective view of the ice maker 25, which is partially shown.

[0037] The water supply tank 26 is generally rectangular in shape and is capable of storing water inside. A water supply pump 28 is disposed at the rear 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, the delivery pipe 31 extends downward from the water supply pump 28.

[0038] Figure 3 This is a connection diagram showing the connection structure during the testing of the ice maker 25.

[0039] The refrigerator 10 has a built-in water pump 28 and a conversion circuit 29. As described above, the water pump 28 has the function of using the driving force of an electric motor to deliver water from the water tank 26 to the ice tray 27. The conversion circuit 29 is a circuit that converts the current supplied to the water pump 28 into voltage when checking the condition of the water pump 28, and it is programmed into the control board that controls the cooling operation of the refrigerator 10.

[0040] The inspection machine 30 is an external device connected to the refrigerator 10 during the step of inspecting the refrigerator 10 for good or bad conditions; for example, it is a small computer programmed with a predetermined program.

[0041] The conversion circuit 29 is connected to the inspection machine 30. The conversion circuit 29 and the inspection machine 30 can be connected either by a connecting cable or wirelessly.

[0042] Figure 4 This is a circuit diagram illustrating an example of a conversion circuit 29 that converts current from water pump 28 into voltage. The conversion circuit 29 is capable of converting the current input from water pump 28 into voltage.

[0043] One terminal of the water pump 28 is connected to the non-inverting input terminal of the operational amplifier 55 via path 33. Furthermore, the inverting input terminal of the operational amplifier 55 is grounded via path 35, and resistor 50 is inserted into path 35. Connection point 61 of path 33 and connection point 60 of path 35 are connected via path 34, and resistor 51 is inserted into path 34. Connection point 63 of path 35 is connected to the inspection machine 30 via path 36. Resistors 52 and 53 are inserted into path 36.

[0044] Operational amplifier 55 is connected to the power supply via path 37 and grounded via path 38. Furthermore, connection point 64 of path 37 and connection point 62 of path 38 are connected via path 39. Capacitor 56 is inserted into path 39.

[0045] The output terminal of operational amplifier 55 is connected to connection point 65 of path 36 via path 40.

[0046] One end of resistor 54, capacitor 57, capacitor 58, and diode 59 is connected to path 36, while the other end is grounded. Resistor 54, capacitor 57, capacitor 58, and diode 59 are components that stabilize the output voltage of the inspection machine 30.

[0047] When inspecting the water supply pump 28, when the pump is operational, current flows through path 33. The voltage corresponding to this current is output to the inspection machine 30 via operational amplifier 55, path 40, connection point 65, and path 36. For example, let the current value flowing through the water supply pump 28 be Ip, and let the voltage value output from the conversion circuit 29 to the inspection machine 30 be Vout, where Vout = 6.4 × Ip. That is, the voltage output to the inspection machine 30 via the conversion circuit 29 is proportional to the current flowing through the water supply pump 28.

[0048] Figure 5 This is a flowchart illustrating the inspection method for the water supply pump 28. In the manufacturing process of the refrigerator 10, after the assembly process is completed, inspections are performed on various constituent equipment such as the refrigeration cycle. The inspection procedure for the water supply pump 28 is one such inspection.

[0049] In step S10, after the assembly process of the refrigerator 10 is completed, in order to determine the condition of the water supply pump 28, the operator connects the conversion circuit 29 to the inspection machine 30. Specifically, the terminals of the inspection machine 30 are connected to the conversion circuit 29, which is part of the control board of the refrigerator 10.

[0050] In step S11, the operator fills the water supply tank 26 with water.

[0051] In step S12, based on the instructions of the control device, the water supply pump 28 operates in both forward and reverse directions. That is, the motor, which is part of the water supply pump 28, operates in both forward and reverse directions.

[0052] In step S13, based on the instructions of the control device of the inspection machine 30, the voltage output by the conversion circuit 29 of the water pump 28 during forward and reverse rotation in step S12 is measured and recorded. Here, the control device is, for example, the control board included in the refrigerator 10, or the microcomputer included in the inspection machine 30. In this embodiment, the operating current of the water pump 28 is detected as voltage by the conversion circuit 29, and the condition of the water pump 28 is determined based on this voltage value.

[0053] In step S14, water is drawn from the water supply tank 26. For example, based on an instruction from the control device on the refrigerator 10 side, the water supply pump 28 is activated until the water stored in the water supply tank 26 is discharged.

[0054] In step S15, based on the instructions of the control device, the water supply pump 28 is controlled to operate in both forward and reverse directions when there is no water in the water supply tank 26.

[0055] In step S16, based on the instructions of the control device of the inspection machine 30, the voltage output by the conversion circuit 29 of the water supply pump 28 during forward and reverse rotation in step S15 is measured and recorded.

[0056] In step S17, based on the instructions of the control device of the inspection machine 30 and the changes in voltage values ​​recorded in steps S13 and S16 above, the condition of the water supply pump 28 is determined. Alternatively, after step S17, a notification unit such as a display or speaker can be used to notify the operator of the condition determination.

[0057] After the above process is completed, remove the connection terminal of the inspection machine 30 from the conversion circuit 29.

[0058] Subsequently, if the water supply pump 28 is a qualified product, the results of other tests are 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, it is replaced. Alternatively, if the connection between the water supply pump 28 and the lead wire is improper, the lead wire connection is corrected.

[0059] Figures 6(A) and 6(B) show the above-mentioned water supply pump 28 and its normal connection. Figure 6(A) is a graph showing the voltage change when there is water in the water supply tank 26, and Figure 6(B) is a graph showing the voltage change when there is no water in the water supply tank 26. In the graphs shown here, the horizontal axis represents time, and the vertical axis represents the voltage applied to the inspection machine 30.

[0060] Referring to Figure 6(A), when there is water in the water supply tank 26, the water supply pump 28 reverses during period T11, rotates forward during period T12, and reverses again during period T13. The periods outside of these are non-operational periods when the water supply pump 28 is not in operation. This allows confirmation of the operation of the water supply pump 28 when there is water in the water supply tank 26, and also confirms the water supply volume of the water supply pump 28. Furthermore, by confirming the operation of the water supply pump 28 when there is water in the water supply tank 26, it is possible to check whether the forward and reverse rotation of the water supply pump 28 is correctly switched.

[0061] As is evident from the graph, the voltage is higher during any of the periods T11, T12, and T13 than during the non-operation period. Therefore, by comparing the voltage during T11 with the voltage during T12, the condition of the water pump 28 can be determined.

[0062] This illustrates a specific example of how to determine the condition of the water pump 28. The water pump 28 flows with a current of 0.05A to 0.16A under no-load conditions and 0.2A to 0.5A under rated load conditions. On the other hand, the output voltage of the conversion circuit 29 is 6.4 times the current flowing in the water pump 28. Therefore, under no-load conditions, the output voltage of the conversion circuit 29 is 0.32V to 1.02V, and under rated load conditions, the output voltage of the conversion circuit 29 is 1.28V to 3.2V. The inspection machine 30 determines the condition of the water pump 28 based on these voltage values.

[0063] For example, if the peak voltage during period T11 (when the water supply pump 28 is under no load) is lower than the peak voltage during period T12 (when the water supply pump 28 is under rated load), then the water supply pump 28 can be determined to be a qualified 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 be confirmed that the signal for switching the forward and reverse rotation of the water supply pump 28 is correctly output.

[0064] Furthermore, referring to Figure 6(A), if the peak voltage during T12 (when the water supply pump 28 becomes the rated load) is above a predetermined threshold voltage (e.g., 1.2V), the water supply pump 28 can be determined to be a qualified product.

[0065] Furthermore, if the voltage value when the water supply pump 28 is rotating forward or in reverse is higher than the voltage value when the water supply pump 28 is stopped, then the water supply pump 28 can be determined to be a qualified product. For example, referring to Figure 6(A), if the voltage during T11 is higher than the voltage between T11 and T12, then the water supply pump 28 can be determined to be a qualified product.

[0066] Here, any one of the above determinations can be used, or more than two can be used.

[0067] Referring to Figure 6(B), when there is no water in the water supply tank 26, the water supply pump 28 is reversed during period T21, the water supply pump 28 is forward-rotated during period T22, and the water supply pump 28 is reversed during period T23. 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.

[0068] Here, the condition of the water supply tank 26 can also be determined based on the peak voltage of T22 during the forward rotation of the water supply pump 28.

[0069] For example, if the peak voltage during T22 (when the water supply pump 28 is unloaded) is less than a predetermined threshold voltage (e.g., 1.2V), the water supply pump 28 can be determined to be a qualified product. Furthermore, by checking the water supply pump 28 with no water in it, it is possible to check whether the water supply tank 26 is empty at the time of manufacture of the refrigerator 10. Simultaneously, the function of the switching circuit 29 can also be checked.

[0070] Figure 7(A) shows a case of lead wire breakage, Figure 7(B) shows a case of other lead wire breakage, and Figure 7(C) shows a case of leads connected in opposite directions. In the cases shown in these figures, a control signal is input from the control device to the water supply pump 28 at the same time as in the case of Figure 6(A). This control signal is used to make the water supply pump 28 operate in both forward and reverse directions.

[0071] Referring to Figure 7(A), the water pump 28 is not working, and no change is observed in the voltage value. This is because of a broken wire in the lead connected to the water pump 28 to supply power, or damage to the control board or circuit components incorporating the aforementioned conversion circuit 29.

[0072] Referring to Figure 7(B), during the entire periods T31, T32, and T33, the water supply pump 28 reverses, and no water is supplied from the water supply tank 26. The reason is the same as in Figure 7(A), such as damage to the leads, control board, or circuit components.

[0073] Referring to Figure 7(C), the water pump 28 is not operating, and no change is observed in the voltage value. This is because the leads are connected in the opposite direction to the water pump 28.

[0074] As described above, by turning the water supply pump 28 forward and reverse, whether the water supply tank 26 has water or not, the condition of the water supply pump 28 and its connection can be accurately determined.

[0075] According to the above-described embodiment, the following main effects can be achieved.

[0076] That is, the condition of the ice maker can be determined even without knowing the drainage volume. Specifically, the condition of the water supply pump 28 is determined based on the voltage when the water supply pump 28 is operating, thus eliminating the need to measure the pump's drainage volume and making it easy to determine the pump's condition.

[0077] Furthermore, by judging the condition of the water supply pump 28 based on the voltage when it is operated in the forward and reverse directions, the water supply pump 28 can be inspected. In addition, the connection condition of the water supply pump 28 can also be correctly judged.

[0078] Furthermore, by determining the condition of the water 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 condition of the water pump 28 can be determined under these conditions. In addition, the switching circuit 29 can also be checked at the same time.

[0079] By using the conversion circuit 29 included in the refrigerator 10, inspection can be easily performed using an externally prepared inspection device.

[0080] This invention is not limited to the embodiments described above. Furthermore, various modifications and implementations can be made without departing from the spirit of this invention.

[0081] For example, refer to Figure 1The system can perform reverse, forward, and reverse rotation of the water supply pump 28 based on instructions from the control unit when supplying water from the water supply tank 26 to the ice-making tray 27. The initial reverse rotation draws up any accumulated water at the front end of the delivery pipe 31. Furthermore, with air circulating inside the delivery pipe 31, forward rotation supplies water from the water supply tank 26 to the ice-making tray 27. The second reverse rotation prevents siphoning. This suppresses the situation where, if water melted in the pipe heater (not shown) remains near the front end of the delivery pipe 31, forward rotation during initial operation would compress the air inside the delivery pipe 31, causing the accumulated water at the front end to suddenly scatter.

Claims

1. A method for inspecting a water supply pump, wherein the water supply pump is located in an ice maker installed inside a refrigerator, the water supply pump being used to deliver water from a water supply tank to an ice-making tray, characterized in that, The inspection method includes: Controlling the operation of the water supply pump; and The condition of the water supply pump is determined based on the voltage during its operation. "Judging the quality of the water supply pump based on the voltage during operation" includes: if the peak voltage of the water supply pump during reverse rotation when there is water in the water tank is lower than the peak voltage of the water supply pump during forward rotation when it is under rated load, then the water supply pump is deemed qualified.

2. The method for inspecting a 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 operate in both forward and reverse directions.

3. The method for inspecting a water supply pump according to claim 1, characterized in that, "Controlling the operation of the water supply pump" includes: The water supply pump is controlled to operate in the forward and reverse directions when the water supply tank contains water and when the water supply tank is empty.

4. The method for inspecting a water supply pump according to any one of claims 1 to 3, characterized in that, "Determining the quality of the water supply pump based on the voltage during operation" includes: determining the quality of the water supply pump based on the voltage value detected by the conversion circuit in the refrigerator.

5. The method for inspecting a water supply pump as described in claim 3, characterized in that... "Determining the condition of the water supply pump based on the voltage during operation" includes: If, when the water supply tank contains water, the peak voltage of the water supply pump during forward rotation at rated load is greater than the threshold voltage, then the water supply pump is deemed qualified.

6. The method for inspecting a water supply pump as described in claim 3, characterized in that... "Determining the condition of the water supply pump based on the voltage during operation" includes: If the peak voltage of the water supply pump during forward rotation when there is no water in the water supply tank is less than the threshold voltage, then the water supply pump is deemed to be qualified.

7. The method for inspecting a water supply pump as described in claim 4, characterized in that... "Determining the condition of the water supply pump based on the voltage during operation" includes: If the voltage value does not change, it is determined that the wire connected to the water pump is broken or the control board or circuit components are damaged.

8. The method for inspecting a water supply pump as described in claim 4, characterized in that... "Determining the condition of the water supply pump based on the voltage during operation" includes: If the voltage value does not change, it can be determined that the lead is connected in the opposite direction to the water supply pump.

9. The method for inspecting a water supply pump as described in claim 3, characterized in that... "Determining the condition of the water supply pump based on the voltage during operation" includes: If the water pump reverses in all periods of time and does not supply water from the water tank, it is determined that the wire connected to the water pump is broken or the control board or circuit components are damaged.

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