JP2010236844A - Auxiliary cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary cooling device capable of moderately supplying water to a filter and avoiding water supply shortage and generation of useless water by controlling start/stop of supplying water to the filter by a water supply device according to water retention state of a mat in the filter. <P>SOLUTION: Temperature sensors 21, 41 detect difference between temperatures of air before passing through the filter 12 and air after passing through it, and the temperature difference is compared with a set value so as to simply determine the water retention state of the mat in the filter 12. Start/stop of supplying water to the filter 12 by the water supply device 11 is controlled according to the water retention state of the filter 12. When the water retention state is good, the water supply is not carried out, and when the water retention state is deteriorated, the water supply is carried out, which can avoid water supply shortage and generation of the useless water in the filter 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an auxiliary cooling device that indirectly cools a heat dissipating part of a heat exchanger provided in an outdoor unit of a refrigeration cycle, and particularly appropriately performs water supply control to a filter that allows air sucked into the heat dissipating part of the heat exchanger to pass therethrough. Auxiliary cooling device that can.

  Heat exchangers (condensers) for outdoor units used in refrigeration cycles such as air conditioning, refrigeration, and refrigeration equipment need to be cooled to liquefy the refrigerant. An auxiliary cooling device is used.

  FIG. 14 is a schematic view of a refrigeration cycle provided with a conventional auxiliary cooling device. This refrigeration cycle 9 is an example of a refrigeration cycle that does not include an electromagnetic switch for a compressor, and includes a compressor (compressor) 2, an evaporator (evaporator) 4, an expansion valve (expansion valve) 6, a condenser (condenser). ) 7 are connected by a refrigerant pipe. Ten portions surrounded by a dotted line are components as an outdoor unit. The compressor 2 is connected to the power source 1 via the control circuit 3. The control circuit 3 is connected to the fan 8 through wiring.

  The auxiliary cooling device 16a includes a water supply device 11, a filter 12, a support frame 13, and the like. The water supply device 11 is a device that supplies water to the filter 12, and is connected to the power source 1 by wiring. The filter 12 has a mat shape with ventilation. A sensor 14 is disposed in the high-pressure pipe 19 between the compressor 2 and the condenser 7. The sensor 14 detects the pressure or temperature of the refrigerant on the outlet side of the compressor 2.

  When the sensor 14 senses a pressure or temperature that is equal to or higher than the set value, the control unit of the water supply device 11 considers that the refrigeration cycle 9 is in operation, and controls the water supply device 11 to supply water to the filter 12. Make it. The drawn-in air flow generated by the rotation of the fan 8 is cooled when water passing through the wet filter 12 is vaporized and flows into the condenser 7. Thereby, the condenser 7 is cooled.

  FIG. 15 is an example of a refrigeration cycle provided with an electromagnetic switch 22 for a compressor, and the same reference numerals are given to components equivalent to the components provided in the refrigeration cycle shown in FIG. The electromagnetic switch 22 is connected to the compressor 2 and the water supply device 11. In the outdoor unit 23 of this type, when the compressor 2 is OFF, the electromagnetic switch 22 is also OFF, and no electric power is supplied from the electromagnetic switch 22 to the opposite power source side. If the power supply of the water supply apparatus 11 is taken from between the electromagnetic switch 22 and the compressor 2 through the wiring 25, when the compressor 2 is OFF, no power is supplied to the water supply apparatus 11, and the water supply apparatus 11 There will be no water supply. For this reason, the sensor 14 shown in FIG. 14 is not necessary in this example. The other configuration is the same as the example shown in FIG. In addition, it is good also as a structure which does not perform water supply of the water supply apparatus 11 when the electricity supply between the electromagnetic switch 22 and the compressor 2 is detected and the compressor 2 is OFF. Thereby, the auxiliary cooling device 16b is not operated when the compressor 2 is not operating.

  FIG. 16 is an example of a refrigeration cycle in which the outdoor unit 24 is a so-called remote condenser type. Elements that are the same as the constituent elements of the refrigeration cycle shown in FIG. The refrigeration cycle 9 is configured by connecting a compressor 2, an evaporator 4, an expansion valve 6, and a condenser 7 with a refrigerant pipe. A portion 24 surrounded by a dotted line is an element configured in the outdoor unit, and includes a condenser 7 and a fan 8. In the refrigeration cycle 9 in this example, the compressor 2 is disposed outside the outdoor unit 24, is connected to the power source 1, and the fan 8 is connected to another power source 26. Here, the power from the power source 26 to the fan 8 is supplied while the compressor 2 is in operation.

  The auxiliary cooling device 16 c includes a water supply device 11, a filter 12, and a support frame 13. The water supply device 11 is a device that supplies water to the filter 12, and is connected to a power supply 26 via a wiring 27. For this reason, when the compressor 2 is OFF, power is not supplied to the water supply device 11 and water supply by the water supply device 11 is not performed. In addition, it is good also as a structure which does not perform water supply of the water supply apparatus 11 when the electricity supply from the power supply 26 to the fan 8 is detected and the compressor 2 is OFF.

The conventional auxiliary cooling device has the following problems.
In the example illustrated in FIG. 14, water supply from the water supply device 11 may be started even when the compressor 2 is OFF. This is because water supply of the water supply device 11 is started when the sensor 14 senses a pressure or temperature equal to or higher than a set value regardless of whether the compressor 2 is ON or OFF.
Further, in the example shown in FIG. 14, water may be supplied even at an outside temperature at which the condenser 7 does not need to be cooled. This is because the sensor 14 obtains information from the temperature and pressure of the high-pressure pipe, and therefore even when the outside air temperature is low, the sensor 14 supplies water if the sensor 14 senses a pressure or temperature that is equal to or higher than a set value.
In the examples shown in FIGS. 14 to 16, water is wasted because all the water is supplied regardless of the outside air temperature.

  Therefore, in order to solve the above problem, the present applicant arranges a sensor for detecting the temperature of the high-pressure pipe between the compressor and the heat exchanger in the refrigeration cycle in the vicinity of the compressor, and the value of the pipe temperature detected by the sensor. When the water temperature is above the set value, the water supply device supplies water, and a temperature sensor is arranged between the filter and the outdoor unit.When the outside air temperature detected by this temperature sensor is above the set value, the water supply device supplies water. We have proposed an auxiliary cooling device that can appropriately control the water supply to the filter of the auxiliary cooling device that indirectly cools the air sucked into the heat radiation part of the heat exchanger of the outdoor unit. Application 2008-87793).

  The previously proposed auxiliary cooling device is when the outdoor unit is moving, that is, when the pipe temperature is equal to or higher than the set value, when the compressor of the refrigeration cycle is ON, or when the fan is ON, and When the outside air temperature is above a certain level, water supply to the filter is started.

JP 2007-198617 A

  According to this proposal, the water supply start timing to the filter by the water supply device when the water supply signal is turned on is improved. However, if the water supply to the filter is not sufficient but the water supply is not stopped, the water supply will be excessive until the water supply is stopped at a predetermined timing. During this time, a part of the supplied water will be discharged from under the mat. It is inevitable that the water drops and becomes wasted water.

  In addition, when the water supply signal is turned ON again after the water supply is stopped, water supply to the filter is started by the water supply device. However, if the water supply start is delayed, the water supply to the filter is insufficient until the water supply is resumed. May occur. In other words, the required amount of water supplied to the filter by the water supply device is usually set based on a certain wind speed, but in reality, the required water supply amount is difficult to set in detail according to the capacity of the outdoor unit (depending on the capacity). Depending on the installation location of the outdoor unit. For example, regarding the installation location, since this auxiliary cooling device is based on the principle of vaporization and humidification, the amount of evaporated water changes depending on the wind speed, but the wind speed changes depending on the installation location. The amount will change. When the wind speed is faster than the set wind speed, the mat becomes dry and the filter is likely to be in an insufficient water supply state. When the wind speed is lower than the set wind speed, the water supply becomes excessive. In either case, there is a risk that the response to the load in the outdoor unit will not be sufficient.

  An object of the present invention is to appropriately control the start and stop of water supply to a filter by a water supply device, so that water supply to the filter can be performed without excess and deficiency, and supply water shortage and waste water can be avoided. An auxiliary cooling device is provided.

  In order to achieve the above object, an auxiliary cooling device according to the present invention includes an air-permeable filter disposed facing a heat radiating portion of a heat exchanger of an outdoor unit of a refrigeration cycle, and a water supply device that supplies water to the filter. An auxiliary cooling device that is cooled by the water supplied to the filter when the air sucked into the heat radiating portion passes through the filter, and detects the water retention state of the filter, The water supply by the water supply device is controlled according to the water retention state.

  According to the auxiliary cooling device of the present invention, the water retention state of the filter is detected, and the water supply by the water supply device is controlled according to the water retention state, so that water supply control without excess or deficiency can be performed.

  More specifically, the present invention can detect the water retention state of the filter based on the temperature difference before and after the passage of the air passing through the filter. An excessive water supply state can be detected when the temperature difference is greater than or equal to the set value, and an insufficient water supply state can be detected when the temperature difference is less than the set value. And when the temperature difference before and behind the filter is greater than or equal to a set value, the water supply of the water supply device can be stopped, and when the temperature difference is less than the set value, the water supply of the water supply device can be started.

The present invention further includes a sensor for detecting a temperature of a high-pressure pipe between the compressor and the heat exchanger in the refrigeration cycle, the sensor is disposed in the vicinity of the compressor, and the detected value is set. If the value is equal to or greater than the value, the water supply device supplies water on the condition that the water retention state is not sufficient, and if the detected value is less than the set value, the water supply device supplies water regardless of the water retention state. It can be stopped.
In the present invention, the compressor is connected to a power source via an electromagnetic switch, and when the energization between the electromagnetic switch and the compressor is detected, the water retention state is not sufficient. When the water supply device supplies water and does not detect the energization between the electromagnetic switch and the compressor, the water supply device can stop water supply regardless of the water retention state.
Further, in the present invention, the compressor of the refrigeration cycle is disposed outside an outdoor unit, and the fan for ventilating the heat radiating unit is connected to a power source different from the compressor, and the energization to the fan is detected. In such a case, the water supply device supplies water on the condition that the water retention state is not sufficient, and when the energization to the fan is not detected, the water supply device stops water supply regardless of the water retention state. Can be.

Furthermore, the present invention includes a temperature sensor that detects an air temperature before the air inlet of the filter, and when the detected value of the temperature sensor is equal to or higher than a set value, the water supply device supplies water, and the temperature sensor When the detected value is less than the set value, the water supply device can stop water supply regardless of other conditions.
In this case, the temperature sensor can be disposed between the filter and the outdoor unit. Furthermore, the amount of water supplied by the water supply device can be changed according to the detection value of the temperature sensor.

  According to the auxiliary cooling device of the present invention, water supply to the filter by the water supply device is controlled according to the water retention state of the filter. When the water retention state of the filter is good, water supply to the filter is not performed, and water supply to the filter is performed when the water retention state deteriorates, so that water supply to the filter is performed without excess or deficiency, and water supply to the filter is insufficient. The generation of wasted water can be avoided. By detecting the temperature before and after the air passing through the filter and comparing the temperature difference with the set value, the water retention status can be judged simply, and the water retention status of the filter during operation of the outdoor unit is always good with a simple configuration. Can be maintained.

FIG. 1 is a schematic view of a refrigeration cycle provided with an auxiliary cooling device according to Embodiment 1 of the present invention. FIG. 2 is a perspective view illustrating a temperature sensor mounting method according to the first embodiment. FIG. 3 is a flowchart illustrating the timing of water supply start of the water supply device according to the first embodiment. FIG. 4 is a flowchart illustrating the timing of water supply stop of the water supply apparatus according to the first embodiment. FIG. 5 is a schematic diagram of a refrigeration cycle provided with an auxiliary cooling device according to Embodiment 2 of the present invention. FIG. 6 is a flowchart illustrating the timing of water supply start of the water supply device according to the second embodiment. FIG. 7 is a flowchart illustrating the timing of water supply stop of the water supply device according to the second embodiment. FIG. 8 is a schematic view of a refrigeration cycle provided with an auxiliary cooling device according to Embodiment 3 of the present invention. FIG. 9 is a flowchart illustrating the timing of water supply start of the water supply device according to the third embodiment. FIG. 10 is a flowchart illustrating the timing of water supply stop of the water supply device according to the third embodiment. It is explanatory drawing of the watering control in the auxiliary cooling device of this invention. FIG. 12 is an explanatory diagram comparing the transition of the wetness of the filter mat between the conventional auxiliary cooling device and the auxiliary cooling device according to the present invention. FIG. 13 is a graph illustrating a comparison of water supply control performed in the conventional auxiliary cooling device and the auxiliary cooling device according to the present invention. FIG. 14 is a schematic diagram showing a conventional example of a refrigeration cycle provided with an auxiliary cooling device. FIG. 15 is a schematic diagram showing a conventional example of a refrigeration cycle provided with an auxiliary cooling device and equipped with an electromagnetic switch for a compressor. FIG. 16 is a schematic diagram showing a conventional example of a refrigeration cycle in which an auxiliary cooling device is attached and an outdoor unit is a so-called remote condenser type.

    Embodiments of an auxiliary cooling device according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic view of a refrigeration cycle provided with an auxiliary cooling device according to Embodiment 1 of the present invention. The refrigeration cycle 9 is configured by connecting a compressor 2, an evaporator 4, an expansion valve 6, and a condenser 7 with a refrigerant pipe. A portion 10 surrounded by a dotted line is an outdoor unit, and includes a compressor 2, a control circuit 3, a fan 8, and a condenser 7. The compressor 2 is connected to the power source 1 via the control circuit 3. The control circuit 3 and the fan 8 are connected by wiring.

  The auxiliary cooling device 16 includes a water supply device 11, a filter 12, a support frame 13, a high pressure temperature sensor 20 that detects the temperature of the high pressure pipe 19, temperature sensors 21 and 41, and the like. The water supply device 11 is a device that supplies water to the filter 12, and is connected to the power source 1 by wiring. The high-pressure temperature sensor 20 and the temperature sensors 21 and 41 are connected to the control unit of the water supply apparatus 11 by wiring. FIG. 11 is an explanatory diagram of water supply control of the auxiliary cooling device according to the present invention. Above the filter 12, a water sprinkler 11 a provided in the auxiliary cooling device 16 is disposed, and water sprinkled from the water sprinkler 11 a is sprinkled from the upper end portion of the mat 12 a of the filter 12. The water gradually flows down along the fibers of the mat 12a, and cools the air by the principle of vaporization and humidification, which vaporizes when the air passes through the mat 12a and takes heat of vaporization from the air. The temperature sensor 21 detects the temperature of the air before passing through the filter 12, that is, the outside air temperature. The temperature sensor 41 detects the temperature of the air after passing through the filter 12.

  The configuration of the auxiliary cooling device in FIG. 1 is different from that in FIG. 14 in that temperature sensors 21 and 41 are provided. The temperature sensor 21 detects the temperature of the air in front of the filter 12. Thereby, the temperature information for detecting external temperature appropriately and performing water supply control according to external temperature is provided to the water supply apparatus 11. FIG. The temperature sensor 41 is disposed behind the filter 12 and detects the temperature of the air after passing through the filter 12. By taking the difference between the detection values of the temperature sensors 21 and 41, it is possible to detect a temperature change when the air sucked into the outdoor unit 10 passes through the filter 12. If the water retention state of the filter 12 is sufficient, the temperature is lowered due to the loss of heat of vaporization when the air passes through the filter 12, resulting in a large temperature difference. Further, if the water retention state of the filter 12 is not sufficient and is in a dry state, the heat of vaporization is not sufficiently deprived when the air passes through the filter 12, and the temperature does not decrease much, resulting in a small temperature difference.

Next, the present embodiment differs from the conventional example in that the sensor 14 in FIG. 14 detects the temperature or pressure of the sensor of the high-pressure pipe, whereas in the present embodiment 1, the temperature-type high-pressure sensor 20 is used. Installed in the vicinity of the compressor 2, the set temperature at which the control circuit 13 starts driving the water supply device 11 was set higher than in the past. Thereby, it can prevent more reliably that the water supply apparatus 11 starts water supply when the compressor 2 is OFF. A specific example of this set value is shown below.
Refrigerant Conventional invention R22 55 ° C → 60 ° C
R502 50 ℃ → 55 ℃
R410A 60 ° C → 65 ° C
R407C 55 ° C → 60 ° C
R404A 50 ° C → 55 ° C
R507A 45 ° C → 50 ° C
In the above example, each refrigerant is raised by 5 ° C. from the conventional set value, and the minimum value thereof is 50 ° C. This is a set value that prevents the water supply device 11 from starting water supply when the compressor 2 is not operating.

  FIG. 2 is a perspective view showing a method for attaching the temperature sensor 21. On both sides of the outdoor unit 10, auxiliary cooling devices 16 having a filter 12, a support frame 13, and the like are disposed. The support frame 13 holds the filter 12. Here, a gap is provided between the outdoor unit 10 and the auxiliary cooling device 16 via a spacer 31. As a result, there is air flowing from outside the outdoor unit 10 through the filter 12 into the condenser 7 and air flowing into the condenser 7 through the gap between the outdoor unit 10 and the auxiliary cooling device 16.

  The spacer 31 is installed between the outdoor unit 10 and the support frame 13, and the temperature sensor 21 is disposed below the spacer 31. As a result, the temperature sensor 21 becomes a shaded part and is not affected by direct sunlight. Moreover, since the air between the outdoor unit 10 and the support frame 13 does not pass through the filter 12, it is suitable for accurate outdoor temperature measurement.

  The temperature sensor 21 is fixed by a clip 33 attached to the support frame 13 at a lower portion of the spacer 31. The temperature sensor 21 can be easily attached by fixing the body of the temperature sensor 21 to the clip 33. If necessary, the wiring 34 or the like is fixed to the existing hole of the spacer 31 by the band 32 or the like. Accordingly, maintenance such as replacement of the temperature sensor 21 can be easily performed.

  FIG. 3 is a flowchart illustrating the timing of water supply start of the water supply device according to the first embodiment. The water supply apparatus 11 has a control part which consists of microcomputers, and the process shown in FIG. 3 is performed by the control part. First, it is determined from the information from the high-pressure temperature sensor 20 whether the pipe temperature is equal to or higher than a set value (S101). If it is equal to or higher than the set value, it is determined from the information from the temperature sensor 21 whether the outside air temperature is equal to or higher than the set value (S102). If it is not equal to or greater than the set value, the process returns to S101. If it is equal to or greater than the set value, the temperature difference between the air inlet and the air outlet of the mat 12a of the filter 12, that is, the temperature difference detected by the temperature sensors 21 and 41 It is determined whether it is equal to or less than the set value (S103). If this temperature difference is not less than the set value, the process returns to S101. That is, when the temperature difference exceeds the set value, the water retention state of the filter 12 is sufficient, the air is sufficiently cooled by vaporization of water, and there is no need for water supply. Do not start water supply. When the temperature difference is equal to or smaller than the set value, the water retention state of the filter 12 is not sufficient, and the air is not sufficiently cooled, so water supply by the water supply device 11 is started. Thereby, only when the compressor 2 is ON, control of the water supply amount according to the outside air temperature and the temperature difference becomes possible.

  FIG. 4 is a flowchart illustrating the timing of water supply stop of the water supply apparatus according to the first embodiment. The water supply stop process shown in FIG. 4 is performed by the control unit of the water supply apparatus 11. First, it is determined from the information from the high-pressure temperature sensor 20 whether or not the pipe temperature is equal to or lower than the set value (S401). If it is not below the set value, it is determined from the information from the temperature sensor 21 whether the outside air temperature is below the set value (S402). If it is less than the set value, stop water supply. If it is not less than the set value, it is determined whether the temperature difference between the air inlet and the air outlet of the mat 12a of the filter 12 is greater than or equal to the set value (S403). If this temperature difference is not greater than the set value, the process returns to the previous step of S401. That is, when the temperature difference is smaller than the set value, the water retention state is not sufficient, and there is a need for water supply, so water supply is not stopped. When the temperature difference is greater than or equal to the set value, the water retention state is sufficient, and the water supply by the water supply device 11 is stopped. Thereby, when one of the three conditions that the compressor 2 is OFF, the outside air temperature is low, and the water retention state is sufficient is satisfied, the water supply is stopped and waste water can be eliminated.

FIG. 5 is a schematic view of a refrigeration cycle provided with an auxiliary cooling device according to Embodiment 2 of the present invention, and FIGS. 6 and 7 are flowcharts showing the timing of water supply start and water supply stop of the water supply device in Embodiment 2, respectively. It is.
The refrigeration cycle shown in FIG. 5 shows Example 2 of the present invention corresponding to the example provided with the electromagnetic switch 22 shown in FIG. 15, and the re-explanation of the refrigeration cycle itself is omitted. In the present embodiment and each of the following embodiments, portions corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. As for the control of the timing of water supply start and water supply stop of the water supply device 11 shown in FIGS. 6 and 7, it is determined whether or not the operation of the compressor 2 is ON in S201, and whether or not the operation of the compressor 2 is OFF in S501. Except for determination, it is equivalent to the timing control of the water supply start and water supply stop of the water supply apparatus shown in FIGS. In particular, since the control contents are the same for the control of the start of water supply (starting with an AND condition) and the stop (stopping with an OR condition) based on the temperature difference between the temperature sensors 21 and 41, a repetitive description is omitted.

FIG. 8 is a schematic diagram of a refrigeration cycle provided with an auxiliary cooling device according to Embodiment 3 of the present invention, and FIGS. 9 and 10 are flowcharts showing the timing of water supply start and water supply stop of the water supply device in Embodiment 3, respectively. It is.
The refrigeration cycle shown in FIG. 8 shows Example 3 of the present invention corresponding to the example provided with the remote condenser type outdoor unit 24 shown in FIG. 16, and the re-explanation of the refrigeration cycle itself is omitted. Also in this example, the auxiliary cooling device 16 includes temperature sensors 21 and 41 that detect the air temperature before and after the filter 12, and detects a temperature difference between the air. As for the control of the timing of water supply start and water supply stop of the water supply apparatus 11 shown in FIGS. 9 and 10, it is determined whether or not the fan 8 is turned on by energizing the wiring 27 in S301, and energization via the wiring 27 is performed in S601. Is the same as the timing control of the water supply start and water supply stop of the water supply apparatus shown in FIG. 3 and FIG. 4 except that it is determined whether or not the fan 8 is OFF. In particular, since the control contents are the same for the start (starting with the AND condition) and stop (stopping with the OR condition) control of the water supply based on the temperature difference, a repetitive description is omitted.

FIG. 12 is an explanatory diagram comparing the transition of the wetness of the mat 12a of the filter 12 shown in FIG. 11 between the conventional auxiliary cooling device and the auxiliary cooling device according to the present invention. FIG. 13 is a graph illustrating a comparison of the water supply control performed in the conventional auxiliary cooling device and the auxiliary cooling device according to the present invention. An example of a change in the water supply signal in both auxiliary cooling devices and the mat inlet-outlet An example of a change in temperature difference is shown.
As shown in FIGS. 12 and 13, when the water supply signal is turned on based on the information on the operating state of the refrigeration cycle and the outside air temperature, the water supply is started and the water supply is continued for a predetermined time. After that, water supply is stopped. Conventionally, as shown in the temperature difference graph of FIG. 13, a substantially constant temperature difference is maintained. In this case, the water sprinkled from the water sprinkler 11a may drop from the lower end of the filter 12 and become waste water.

  In the present invention, from the sprinkler 11a until the first ON when watering is started, it is the same as the conventional one, but the temperature difference obtained from the detected values of the temperature sensors 21, 41 is compared with the set value, and the temperature difference While this exceeds the set value, it is determined that the mat 12a of the filter 12 is sufficiently wet and is in a good water retaining state, and the water supply is stopped. That is, when there is a predetermined temperature difference (exceeding the set value) between the air inlet and the air outlet of the mat 12a, water has already been sufficiently supplied to the mat 12a. It is determined that the temperature of the air is decreasing in order to take away the heat of vaporization, and it is determined that there is no need to continue the supply of water. The water retention state of the mat 12a is reduced (insufficient water supply), and when the mat 12a is dried, the temperature difference becomes small (for example, the temperature difference is reduced from 10 degrees to 4 degrees), so the water supply is resumed. Next, since the timing T2 at which the water supply is turned on is sufficiently delayed from the conventional timing (T2 '), the total water supply amount in the entire water supply period can be reduced. As described above, the difference in air temperature between the air inlet and the air outlet of the mat 12a is a means for monitoring whether the amount of water supplied to the mat 12a is sufficient or not, and based on the temperature difference. By performing the water supply control, the amount of water supplied to the filter 12 can be minimized, and generation of wasted water and water shortage can be avoided.

  According to the present invention, by using two temperature sensors that detect the temperatures of the air inlet and the air outlet of the mat, there is no need to make detailed settings according to the refrigeration capacity of the outdoor unit at the time of installation. No detailed setting according to) is required, and appropriate water supply adjustment for the auxiliary cooling device can be automatically performed.

DESCRIPTION OF SYMBOLS 1 Power supply 2 Compressor 4 Evaporator 7 Condenser 8 Fan 9 Refrigeration cycle 10, 23, 24 Outdoor unit 11 Water supply device 11a Sprinkler 12 Filter 12a Mat 13 Support frame 15-17 Auxiliary cooling device 20 High pressure sensor 21 Temperature sensor 22 Electromagnetic switch 26 Power supply 31 Spacer 33 Clip 41 Temperature sensor

Claims (9)

A filter having air permeability arranged opposite to the heat radiating part of the heat exchanger of the outdoor unit of the refrigeration cycle, and a water supply device for supplying water to the filter, and air sucked into the heat radiating part An auxiliary cooling device that is cooled by the water supplied to the filter when passing through,
An auxiliary cooling device that detects a water retention state of the filter and controls water supply by the water supply device according to the water retention state.   The auxiliary cooling device according to claim 1, wherein the water retention state of the filter is detected based on a temperature difference before and after the passage of the air passing through the filter.   The water supply of the water supply device is stopped when the temperature difference is greater than or equal to a set value, and the water supply of the water supply device is started when the temperature difference is less than the set value. Auxiliary cooling device.   When a sensor for detecting the temperature of a high-pressure pipe between the compressor and the heat exchanger in the refrigeration cycle is provided, and the sensor is disposed in the vicinity of the compressor, and the detected value is equal to or higher than a set value The water supply device supplies water on the condition that the water retention state is not sufficient, and the water supply device stops water supply regardless of the water retention state when the detected value is less than the set value. The auxiliary cooling device according to any one of claims 1 to 3.   When the compressor is connected to a power source via an electromagnetic switch, and the energization between the electromagnetic switch and the compressor is detected, the water supply device supplies water on the condition that the water retention state is not sufficient. And when the energization between the electromagnetic switch and the compressor is not detected, the water supply device stops water supply regardless of the water retention state. The auxiliary cooling device as described.   The compressor of the refrigeration cycle is arranged outside the outdoor unit, and the fan for ventilating the heat radiating unit is connected to a power source different from the compressor, and when detecting energization to the fan, The water supply device performs water supply on the condition that the water retention state is not sufficient, and when the energization to the fan is not detected, the water supply device stops water supply regardless of the water retention state. The auxiliary cooling device according to any one of claims 1 to 3.   A temperature sensor for detecting an outside air temperature before the air inlet of the filter, and when the detected value of the temperature sensor is equal to or higher than a set value, the water supply device supplies water, and the detected value of the temperature sensor is the set value; The auxiliary cooling device according to any one of claims 4 to 6, wherein the water supply device stops water supply regardless of other conditions when the value is less than the value.   The auxiliary cooling device according to claim 7, wherein the temperature sensor is disposed between the filter and the outdoor unit.   The auxiliary cooling device according to claim 7 or 8, wherein a water supply amount by the water supply device is changed according to a detection value of the temperature sensor.

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