Cooling device

Abstract

To suppress occurrence of cooling abnormality by preventing drive stop of a compressor under a high load environment.SOLUTION: In a cooling device 10 including a cooling circuit 11 in which an evaporator 111, a compressor 112, a condenser 113 and an expansion mechanism 114 are successively connected by a refrigerant pipe conduit 115 and a refrigerant is sealed, and cooling a storage chamber 2a of a showcase 2 provided with the evaporator 111 by evaporating the refrigerant in the evaporator 111, a storage portion 12 is disposed for storing drain water generating from an air conditioning device for conditioning a temperature of air in a shop 1 in which the showcase 2 is installed, and the drain water stored in the storage portion 12 is sprayed to the condenser 113 for condensing the refrigerant compressed by the compressor 112 by heat radiation to ambient air thereof.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an improvement in a cooling device. [Background technology]

[0002] Conventionally, cooling devices used in showcases that maintain stored products at a desired temperature include a refrigerant circuit, which is configured by a compressor, a condenser, an expansion mechanism, and an evaporator connected in sequence by refrigerant pipes, and contains a refrigerant sealed inside.

[0003] The compressor draws in the refrigerant from the evaporator, compresses it, and discharges it. The condenser condenses the refrigerant compressed by the compressor by releasing heat into the surrounding air. The expansion mechanism adiabatically expands the refrigerant condensed by the condenser and discharges low-temperature, low-pressure refrigerant. The evaporator evaporates the low-temperature, low-pressure refrigerant discharged from the expansion mechanism to cool the surrounding air.

[0004] Such a cooling device has a compressor and a condenser installed in an outdoor unit outside the store where the showcase is located, and an evaporator installed inside the showcase, thereby cooling the products stored in the showcase (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-68975 Summary of the Invention [Problem to be solved by the invention]

[0006] In a cooling system in which the compressor and condenser are installed in an outdoor unit, the compressor may be stopped to protect the compressor in a high-load environment, such as in summer, when the outside temperature is high. When the compressor stops operating in this way, the temperature inside the showcase rises, resulting in a cooling abnormality and possibly damaging the products.

[0007] In view of the above circumstances, an object of the present invention is to provide a cooling device that can prevent the compressor from stopping under a high load environment and suppress the occurrence of cooling abnormalities. [Means for solving the problem]

[0008] In order to achieve the above object, the cooling device of the present invention comprises a refrigerant circuit in which an evaporator, a compressor, a condenser, and an expansion mechanism are connected in sequence by refrigerant pipes and in which a refrigerant is sealed inside, and the refrigerant evaporates in the evaporator to cool a predetermined area of ​​the equipment in which the evaporator is installed, and is characterized in that it comprises a storage section for storing drain water generated from an air conditioning device that adjusts the temperature of the air in the room in which the equipment is located, and the drain water stored in the storage section is sprayed onto the condenser, which condenses the refrigerant compressed by the compressor by releasing heat into the air around it.

[0009] The present invention is also characterized in that the above-mentioned cooling device is provided with a control unit that performs sprinkling control to sprinkle drain water stored in the storage unit onto the condenser when the cooling load in the refrigerant circuit satisfies a predetermined high load condition.

[0010] The present invention is also characterized in that, in the above-mentioned cooling device, the control unit performs the sprinkling control when the pressure of the refrigerant compressed and discharged by the compressor exceeds a predetermined threshold value, assuming that the high load condition is satisfied.

[0011] The present invention is also characterized in that, in the above-mentioned cooling device, a temperature detection unit is provided that detects the temperature of the drain water stored in the storage unit, and the control unit performs drainage control to discharge the drain water stored in the storage unit when the temperature detected by the temperature detection unit exceeds a predetermined reference temperature.

[0012] The present invention is also characterized in that, in the above-mentioned cooling device, a water level detection unit is provided that detects the water level of the drain water stored in the storage unit, and the control unit allows the sprinkling control when the water level detected by the water level detection unit is equal to or higher than a predetermined reference water level, while restricting the sprinkling control when the water level detected by the water level detection unit is below the reference water level. [Effects of the Invention]

[0013] According to the present invention, the storage unit stores drain water generated by an air conditioning system that adjusts the air temperature in a room where the equipment is installed, and the drain water stored in the storage unit is sprayed onto a condenser that condenses refrigerant compressed by a compressor by dissipating heat into the surrounding air. This makes it possible to cool the condenser even in a high-load environment where the outside air temperature is high, such as in summer, thereby improving the heat dissipation efficiency of the condenser and preventing the compressor from stopping. Therefore, it is possible to avoid compressor stoppages and prevent cooling abnormalities from occurring in a high-load environment. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing a cooling device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a flowchart showing the processing content of the water sprinkling control performed by the control unit shown in FIG. [Figure 3] FIG. 3 is a flowchart showing the processing contents of the drainage control that is carried out by the control unit shown in FIG. 1, separately from the water sprinkling control shown in FIG. [Figure 4]FIG. 4 is a flowchart showing the processing contents of sprinkler valve opening / closing control carried out by the control unit shown in FIG. 1, separately from the sprinkler control shown in FIG. 2 and the drainage control shown in FIG. [Figure 5] FIG. 5 is a perspective view showing a main part of a modified example of the cooling device according to the embodiment of the present invention. [Figure 6] 6 is an enlarged exploded perspective view showing a main part of the reservoir main body shown in FIG. [Figure 7] Figure 7 is a schematic diagram showing the operation of the storage unit shown in Figures 5 and 6, where (a) of Figure 7 shows the storage unit in a standby position, and (b) of Figure 7 shows the storage unit releasing drain water. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a cooling device according to the present invention will be described in detail below with reference to the accompanying drawings.

[0016] 1 is a schematic diagram showing a cooling device according to an embodiment of the present invention. The cooling device 10 shown here includes a refrigerant circuit 11, a storage unit 12, a discharge pressure detection unit 13, a temperature detection unit 14, a water level detection unit 15, and a control unit 20.

[0017] The refrigerant circuit 11 is configured by sequentially connecting an evaporator 111, a compressor 112, a condenser 113, and an expansion mechanism 114 via a refrigerant pipe 115, and is filled with refrigerant. The evaporator 111 is installed inside a showcase 2, which is a device arranged inside the store 1.

[0018] The compressor 112 is installed inside the outdoor unit 3 located outside the store 1. This compressor 112 is driven in response to commands given from the control unit 20, and when driven, it draws in and compresses the refrigerant from the evaporator 111 and discharges the high-temperature, high-pressure refrigerant.

[0019] The condenser 113 is installed inside the outdoor unit 3, and condenses the refrigerant compressed by the compressor 112 by dissipating heat into the surrounding air. The expansion mechanism 114 is composed of, for example, an expansion valve, and adiabatically expands the refrigerant condensed in the condenser 113, and discharges the low-temperature, low-pressure refrigerant to the evaporator 111.

[0020] In such a refrigerant circuit 11, the refrigerant circulates, causing the refrigerant to evaporate in the evaporator 111, thereby cooling the air inside the storage chamber 2a, which is a specified area of ​​the showcase 2, and thereby cooling the products stored in the storage chamber 2a.

[0021] The storage unit 12 is installed outside the store 1. This storage unit 12 is connected to an air conditioning indoor unit 4 of an air conditioner (not shown) through a supply path 121. The air conditioner adjusts the temperature of the air inside the store 1, and the supply path 121 supplies drain water generated in the air conditioning indoor unit 4 to the storage unit 12. As a result, the storage unit 12 stores the drain water supplied through the supply path 121.

[0022] Furthermore, a sprinkler path 122 and a drainage path 123 are connected to the storage section 12. The sprinkler path 122 is installed in a manner that allows the drain water stored in the storage section 12 to be sprinkled onto the condenser 113. The sprinkler path 122 is provided with a sprinkler valve 122a.

[0023] The sprinkler valve 122a is configured, for example, by a solenoid valve or the like, and opens and closes in response to commands given from the control unit 20. When the sprinkler valve 122a is open, it allows drain water to pass through the sprinkler path 122, making it possible to sprinkle the drain water onto the condenser 113, and when it is closed, it restricts the drain water from passing through the sprinkler path 122.

[0024] Drainage path 123 is installed in a manner that allows drainage of the drain water stored in reservoir 12. Drainage path 123 is provided with a drainage valve 123a.

[0025] The drain valve 123a is configured by, for example, an electromagnetic valve, and opens and closes in response to commands given from the control unit 20. When the drain valve 123a is open, it allows the drain water to pass through the drain path 123, enabling the drain water to be discharged, and when it is closed, it restricts the drain water from passing through the drain path 123.

[0026] The discharge pressure detection unit 13 detects the pressure of the refrigerant discharged from the compressor 112 (discharge refrigerant pressure) and provides the detection result as a detection signal to the control unit 20. The temperature detection unit 14 detects the temperature of the drain water stored in the storage unit 12 and provides the detection result as a detection signal to the control unit 20. The water level detection unit 15 detects the water level of the drain water stored in the storage unit 12 and provides the detection result as a detection signal to the control unit 20.

[0027] The control unit 20 comprehensively controls the operation of the cooling device 10 in accordance with programs and data stored in a storage unit (not shown), and performs sprinkler control, drainage control, and sprinkler valve opening / closing control, which are characteristic of the present invention. Note that the control unit 20 may be realized by, for example, having a processing device such as a CPU (Central Processing Unit) execute a program, i.e., by software, or by hardware such as an IC (Integrated Circuit), or by a combination of software and hardware.

[0028] Fig. 2 is a flowchart showing the processing content of the sprinkling control carried out by the control unit 20 shown in Fig. 1. The operation of the cooling device 10 will be described while explaining the processing content of the sprinkling control.

[0029] In this sprinkling control, the control unit 20 waits for an input of a detection signal from the discharge pressure detection unit 13, that is, waits for the discharge pressure detection unit 13 to detect the discharge refrigerant pressure (step S101).

[0030] If the discharge pressure detection unit 13 detects the discharge refrigerant pressure (step S101: Yes), the control unit 20 reads out the reference pressure that is the threshold value for the high load condition from the memory unit and determines whether the discharge refrigerant pressure exceeds the reference pressure (step S102).

[0031] If the discharged refrigerant pressure is equal to or lower than the reference pressure (step S102: No), the control unit 20 returns the procedure without performing the process described below, and ends the current process.

[0032] On the other hand, if the discharged refrigerant pressure exceeds the reference pressure (step S102: Yes), the control unit 20 determines that the cooling load of the refrigerant circuit 11 satisfies the high load condition (step S103), issues an open command to the sprinkler valve 122a to open the sprinkler valve 122a (step S104), and waits for the predetermined opening time to elapse (step S105).

[0033] This allows a predetermined amount of drain water stored in the storage section 12, that is, drain water supplied from the air conditioning indoor unit 4 of the air conditioner and stored, to be sprayed onto the condenser 113 of the outdoor unit 3.

[0034] Then, if the open time has elapsed in step S105 (step S105: Yes), the control unit 20 issues a close command to the sprinkler valve 122a to close the sprinkler valve 122a (step S106), and then returns the procedure to end the current processing.

[0035] According to this, instead of constantly spraying the drain water stored in the storage section 12 onto the condenser 113, the drain water stored in the storage section 12 can be sprayed when it is determined that the cooling load in the refrigerant circuit 11 satisfies the high load condition.

[0036] Fig. 3 is a flowchart showing the processing contents of drainage control that is performed by the control unit 20 shown in Fig. 1, separately from the water sprinkling control shown in Fig. 2. The operation of the cooling device 10 will be described while explaining the processing contents of the drainage control.

[0037] In this drainage control, the control unit 20 waits for an input of a detection signal from the temperature detection unit 14, that is, waits for the temperature detection unit 14 to detect the temperature of the drain water (step S111).

[0038] If the temperature detection unit 14 detects the temperature of the drain water (step S111: Yes), the control unit 20 reads out the reference temperature, which is the threshold value for the drainage treatment, from the memory unit and determines whether the detected temperature exceeds the reference temperature (step S112).

[0039] If the detected temperature is equal to or lower than the reference temperature (step S112: No), the control unit 20 returns the procedure without performing the process described below, and ends the current process.

[0040] On the other hand, if the detected temperature exceeds the reference temperature (step S112: Yes), the control unit 20 determines that the drain water stored in the storage unit 12 is at a high temperature, issues an open command to the drain valve 123a to open the drain valve 123a (step S113), and waits for a predetermined time to elapse (step S114).

[0041] This allows drain water stored in the storage section 12, that is, drain water supplied from the air conditioning indoor unit 4 of the air conditioner and stored therein, to be discharged.

[0042] Then, if a predetermined time has elapsed in step S114 (step S114: Yes), the control unit 20 issues a close command to the drain valve 123a to close the drain valve 123a (step S115), and then returns the procedure to end this processing.

[0043] According to this, when the drain water stored in the storage section 12 falls below a reference temperature, the drain water can be sprayed onto the condenser 113 by the above-mentioned sprinkling control, whereas when the drain water becomes too hot and exceeds the reference temperature, the drain water can be discharged without being sprayed onto the condenser 113.

[0044] Fig. 4 is a flowchart showing the processing contents of the sprinkler valve opening / closing control performed by the control unit 20 shown in Fig. 1, separately from the sprinkler control shown in Fig. 2 and the drainage control shown in Fig. 3. The operation of the cooling device 10 will be described while explaining the processing contents of the sprinkler valve opening / closing control.

[0045] In this sprinkler valve opening / closing control, the control unit 20 waits for an input of a detection signal from the water level detection unit 15, that is, waits for the water level detection unit 15 to detect the water level of the drain water (step S121).

[0046] If the water level detection unit 15 detects the water level of the drain water (step S121: Yes), the control unit 20 reads out the reference water level, which is the threshold for controlling the opening and closing of the sprinkler valve, from the memory unit and determines whether the detected water level is equal to or higher than the reference water level (step S122).

[0047] If the detected water level is equal to or higher than the reference water level (step S122: Yes), the control unit 20 allows an open command to the sprinkler valve 122a (step S123), and then returns the procedure to end the current processing.

[0048] On the other hand, if the detected water level is lower than the reference water level (step S122: No), the control unit 20 restricts the opening command to the sprinkler valve 122a (step S124), and then returns the procedure to end this processing.

[0049] According to this type of sprinkler valve opening / closing control, the control unit 20 allows the above-mentioned sprinkler control when the water level detected by the water level detection unit 15 is equal to or higher than the reference water level, while restricting the above-mentioned sprinkler control when the water level detected by the water level detection unit 15 is lower than the reference water level.

[0050] As described above, according to cooling device 10 which is an embodiment of the present invention, storage unit 12 stores drain water generated from an air conditioning device that adjusts the temperature of the air inside store 1 in which showcase 2 is arranged, and the drain water stored in storage unit 12 is sprayed onto condenser 113. Therefore, even in a high-load environment where the outside air temperature is high, such as in summer, condenser 113 can be cooled, the heat dissipation efficiency of condenser 113 can be improved, and stopping of compressor 112 can be suppressed. Therefore, stopping of compressor 112 can be avoided in a high-load environment, and the occurrence of cooling abnormalities can be suppressed.

[0051] In particular, according to the cooling device 10, the drain water of the air conditioner stored in the storage section 12 is sprayed onto the condenser 113, so that the drain water is sufficiently cooled, for example in the summer, and can effectively cool the condenser 113. Moreover, because the air conditioner is configured as a combination of the air conditioner indoor unit 4 and the air conditioner outdoor unit (not shown), the drain water generated in the air conditioner indoor unit 4 can be easily introduced outside the store 1, and compared to introducing the drain water generated in the evaporator 111 that constitutes the refrigerant circuit 11 of the cooling device 10, i.e., the evaporator 111 installed in the showcase 2, outside the store 1, no construction costs are required, and costs can be reduced.

[0052] Furthermore, according to the cooling device 10, when the discharge refrigerant pressure detected by the discharge pressure detection unit 13 exceeds the reference pressure, the control unit 20 determines that the cooling load in the refrigerant circuit 11 satisfies the high load condition and performs sprinkling control to sprinkle the drain water stored in the storage unit 12 onto the condenser 113. This allows drain water to be sprinkled in a timely manner when needed, thereby improving cooling efficiency.

[0053] According to the cooling device 10, when the temperature detected by the temperature detection unit 14 exceeds the reference temperature, the control unit 20 performs drainage control to discharge the drain water stored in the storage unit 12, thereby preventing the drain water, which becomes relatively hot, from being sprayed onto the condenser 113.

[0054] Furthermore, according to the cooling device 10, the control unit 20 allows sprinkling control when the water level detected by the water level detection unit 15 is equal to or higher than the reference water level, while restricting sprinkling control when the water level detected by the water level detection unit 15 is lower than the reference water level. Therefore, when sufficient drain water is stored in the storage unit 12, a predetermined amount of drain water can be sprinkled onto the condenser 113, allowing the condenser 113 to be cooled intensively, thereby improving cooling efficiency.

[0055] 5 is a perspective view showing the main parts of a modified example of the cooling device according to the embodiment of the present invention. Note that the same components as those in the cooling device 10 according to the embodiment described above are given the same reference numerals, and the description thereof will be omitted as appropriate.

[0056] 5, the cooling device 10a includes a refrigerant circuit 11 and a storage unit 23. The storage unit 23 is provided in a storage unit main body 22. Here, the storage unit main body 22 is attached to the upper surface of the outdoor unit 3 and has a rectangular parallelepiped shape. The storage unit main body 22 is configured by a frame body 22a having translucent plates (not shown) attached to all surfaces except the upper and lower surfaces, and openings are formed on the upper and lower surfaces.

[0057] As shown enlarged in Fig. 6, the storage section 23 has a cylindrical shape with a bottom, and is held by a holding member 24 made by processing sheet metal or the like. Step screws 241 are provided on the front and rear surfaces of the holding member 24 so as to protrude outward.

[0058] Such holding members 24 are provided by being mounted on mounting brackets 25, which are installed in a pair at the front and rear of the storage section main body 22. The mounting brackets 25 are installed in a pair at the front and rear of the storage section main body 22 with their inner surfaces facing each other, and are plate-like members with their longitudinal direction extending in the up-down direction. Support pieces 251 are provided at a predetermined height position on these mounting brackets 25. The support pieces 251 are formed by cutting out a portion of the mounting bracket 25, bending a tongue-shaped member inward and then upward, and forming slits 251a that extend in the up-down direction and have an open upper end. The shoulder screws 241 of the holding member 24 are inserted into these slits 251a from the upper end, thereby mounting the holding member 24 on the mounting bracket 25. More specifically, the storage section 23 is detachably mounted on the mounting bracket 25 so as to be swingable together with the holding member 24 around the central axis of the shoulder screws 241. Storage unit 23 and holding member 24 are normally arranged in a standby position in which the left end portion of holding member 24 is in contact with receiving member 26 provided on storage unit main body 22 due to its own weight. When storage unit 23 and holding member 24 are arranged in the standby position in this manner, the opening portion of storage unit 23 is located directly below the drain water outlet of supply path 121, via the opening on the top surface of storage unit main body 22.

[0059] In such a cooling device 10a, drain water generated in the air conditioning indoor unit 4 of the air conditioner passes through the supply path 121 and is discharged from the discharge port, and is supplied to the storage section 23 arranged in a standby position as shown in (a) of Figure 7, and is stored in the storage section 23.

[0060] When the amount of drain water stored in storage section 23 reaches a predetermined amount, storage section 23 swings together with holding member 24 around the central axis of shoulder screw 241, and as shown in Figure 7(b), the drain water is discharged through an opening on the bottom surface of storage section main body 22, and the discharged drain water is guided into the outdoor unit 3 via a guide member (not shown) and sprayed onto condenser 113. After sending out the drain water downward, storage section 23 then swings together with holding member 24 due to its own weight and is placed in a standby position.

[0061] According to the cooling device 10a, the storage unit 23 stores drain water generated from the air conditioner and sprays the drain water stored in the storage unit 23 onto the condenser 113. Therefore, even in a high-load environment where the outside air temperature is high, such as in summer, the condenser 113 can be cooled, the heat dissipation efficiency of the condenser 113 can be improved, and stopping of the compressor 112 can be suppressed. Therefore, stopping of the compressor 112 can be avoided in a high-load environment, and the occurrence of cooling abnormalities can be suppressed.

[0062] In particular, according to the cooling device 10a, the drain water of the air conditioner stored in the storage section 23 is sprayed onto the condenser 113, so that the drain water is sufficiently cooled, for example in the summer, and can effectively cool the condenser 113. Moreover, the drain water generated in the air conditioning indoor unit 4 can be easily introduced outside the store 1, and compared to introducing the drain water generated in the evaporator 111 that constitutes the refrigerant circuit 11 of the cooling device 10a, i.e., the evaporator 111 installed in the showcase 2, outside the store 1, no construction costs are required, and costs can be reduced.

[0063] Furthermore, according to the cooling device 10a, the storage section 23 is removably mounted on the mounting bracket 25 so as to be swingable around the central axis of the stepped screw 241 together with the holding member 24, so that the storage section 23 can be removed from the storage section main body 22 together with the holding member 24, making it easy to clean the storage section 23, etc.

[0064] Although the preferred embodiments and modifications of the present invention have been described above, the present invention is not limited to these and various modifications can be made.

[0065] In the above-described embodiment, whether the high load condition of the cooling load of the refrigerant circuit 11 is satisfied is determined based on the magnitude of the discharge refrigerant pressure, but in the present invention, whether the high load condition of the cooling load of the refrigerant circuit 11 is satisfied may be determined based on a factor other than the discharge refrigerant pressure. That is, in the present invention, whether the high load condition of the cooling load of the refrigerant circuit 11 is satisfied may be determined based on whether any one of the temperature of the refrigerant discharged from the compressor 112, the outlet temperature of the condenser 113, the input current or input power of the compressor 112, or the rotation speed of the compressor 112 exceeds a predetermined threshold.

[0066] In the above-described embodiment, drainage control and sprinkler valve opening / closing control are performed, but in the present invention, these drainage control and sprinkler valve opening / closing control do not necessarily have to be performed.

[0067] In the above-described embodiment, whether or not the high load condition is satisfied is determined by water sprinkler control, but in the present invention, the water sprinkler valve may be opened and closed periodically. [Explanation of symbols]

[0068] 1...store, 2...showcase, 2a...storage room, 3...outdoor unit, 4...air conditioning indoor unit, 10...cooling device, 11...refrigerant circuit, 111...evaporator, 112...compressor, 113...condenser, 114...expansion mechanism, 115...refrigerant piping, 12...storage section, 121...supply path, 122...sprinkler path, 122a...sprinkler valve, 123...drainage path, 123a...drainage valve, 13...discharge pressure detection section, 14...temperature detection section, 15...water level detection section, 20...control section.

Claims

1. A cooling device comprising a refrigerant circuit in which an evaporator, a compressor, a condenser, and an expansion mechanism are connected in sequence by refrigerant pipes and in which a refrigerant is sealed, the refrigerant evaporating in the evaporator cools a predetermined area of ​​a device in which the evaporator is installed, a storage unit for storing drain water generated from an air conditioning device that adjusts the temperature of air in a room in which the equipment is located; The reservoir has a cylindrical shape with a bottom, and when the amount of drain water stored in the reservoir reaches a predetermined amount, the reservoir swings to release the drain water, A cooling device characterized in that drain water stored in the storage section is sprayed onto the condenser, which condenses the refrigerant compressed by the compressor by releasing heat into the air around it.

2. The cooling device according to claim 1, further comprising a control unit that performs sprinkling control to sprinkle drain water stored in the storage unit onto the condenser when the cooling load in the refrigerant circuit satisfies a predetermined high load condition.

3. The cooling device according to claim 2, characterized in that the control unit performs the sprinkling control when the pressure of the refrigerant compressed and discharged by the compressor exceeds a predetermined threshold value, assuming that the high load condition is satisfied.

4. a temperature detection unit that detects the temperature of the drain water stored in the storage unit; The cooling device according to claim 2 or 3, characterized in that the control unit performs drainage control to discharge drain water stored in the storage unit when the temperature detected by the temperature detection unit exceeds a predetermined reference temperature.

5. a water level detection unit that detects the water level of the drain water stored in the storage unit; A cooling device described in any one of claims 2 to 4, characterized in that the control unit allows the sprinkler control when the water level detected by the water level detection unit is equal to or higher than a predetermined standard water level, while restricting the sprinkler control when the water level detected by the water level detection unit is lower than the standard water level.

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