JP2013096641A - Cooling device and air conditioner with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device in which a control component is not broken even if the cooling device cannot cool the control component sufficiently.SOLUTION: A cooling device is configured to cool the control component housed in a control box of an air conditioner including a compressor 22, an outdoor heat exchanger 24, a decompression device 26, an indoor heat exchanger 28, and a pipe which connects them and in which a refrigerant flows, and includes: a cooling unit 44 which is arranged in the control box 42 apart from the control component 40, and cools the air in the control box by exchanging heat with the refrigerant; a fan 54 for stirring the air in the control box; in-control-box temperature detection means 60 of detecting the temperature in the control box; and frequency control means 62 of controlling the driving frequency of the compressor, and the control component can be prevented from being broken in rising in temperature above a predetermined temperature since the frequency control means lowers the driving frequency of the compressor once the in-control-box temperature detection means detects a temperature above the predetermined temperature.

Description

  The present invention relates to a cooling device that cools control components of an air conditioner, and an air conditioner including the same.

  Conventionally, in an air conditioner having a compressor, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and a pipe through which refrigerant flows by connecting them, control components such as a control board are protected from, for example, dust or water It is housed in a control box for this purpose. At that time, in order to guarantee that the control component operates stably, it is necessary to consider cooling of the control component. In view of this, a device that detects the temperature in the control box and the temperature of the control component and drives the cooling device has been proposed (for example, see Patent Document 1).

  FIG. 5 shows a conventional cooling device described in Patent Document 1. In FIG. As shown in FIG. 5, a refrigeration cycle 7 comprising an electrical component box 2 containing a heating element 1, a compressor 3, a condenser 4, an expansion valve 5 and an evaporator 6, and a low temperature in the refrigeration cycle 7 A cooling mechanism 8 that cools the heating element 1 with a refrigerant through a radiator 12, heating element temperature detection means 9 that detects the temperature of the heating element 1, and air that detects the temperature in the electrical component box 2 The temperature detection means 10 and the heating element temperature detected by the heating element temperature detection means 9 are compared with the air temperature in the electrical component box detected by the air temperature detection means 10, and the heating element temperature is the air in the electrical component box. The cooling mechanism 8 is operated when the upper limit of a predetermined temperature range above the temperature is reached, and the control unit 11 stops the cooling mechanism 8 when the lower limit of the predetermined temperature range is reached.

JP-A-5-187725

  However, in the case of the air conditioner described in Patent Document 1, when the cooling device (cooling mechanism) cannot sufficiently cool the control component (heating element), the temperature of the control component becomes a predetermined temperature or higher. There was a problem of fear of damage.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a cooling device that does not damage a control component even if the cooling device cannot sufficiently cool the control component.

  In order to solve the above-described conventional problems, a cooling device according to the present invention is arranged in a state separated from a control component in a control box and cools the air in the control box by heat exchange with the refrigerant, and a control A fan that stirs the air in the box, a control box temperature detection unit that detects a temperature in the control box, and a frequency control unit that controls a driving frequency of the compressor that circulates the refrigerant. The frequency control means lowers the frequency when the detection means detects a temperature equal to or higher than a predetermined temperature.

  Accordingly, even if the cooling unit cannot sufficiently cool the control component, the control component can be protected by lowering the drive frequency of the compressor so that the control component does not reach a predetermined temperature or higher.

  According to the cooling device of the present invention, even when the cooling device cannot sufficiently cool the control component, the control component can be protected so that the control component does not reach a predetermined temperature or more, and the cooling with high reliability is achieved. An apparatus and an air conditioner can be realized.

1 is a schematic configuration diagram of a cooling device and an air conditioner according to Embodiment 1 of the present invention. Schematic configuration diagram showing the inside of the control box shown in FIG. 1 is a perspective view of the cooling unit shown in FIG. The schematic block diagram of the cooling device and air conditioner concerning Embodiment 2 of this invention Schematic configuration diagram of a conventional cooling device

  According to a first aspect of the present invention, there is provided a cooling unit that is disposed in a state separated from the control component in the control box and that cools the air in the control box by heat exchange with the refrigerant, a fan that stirs the air in the control box, and a control Control box temperature detection means for detecting the temperature in the box and frequency control means for controlling the drive frequency of the compressor for circulating the refrigerant, and frequency control when the control box temperature detection means detects a temperature above a predetermined level The control part is configured to reduce the frequency, and even if the cooling unit cannot sufficiently cool the control part, the control frequency is lowered to a predetermined level so that the control part does not reach a predetermined temperature. Can be prevented from being damaged, and higher reliability can be secured.

  According to a second aspect of the present invention, there is further provided a fan rotational speed detecting means for detecting the rotational speed of the fan according to the first invention, wherein the frequency control means decreases the frequency when the fan rotational speed detecting means detects a rotational speed below a predetermined value. Even if the rotation speed of the fan is reduced for some reason and the control components cannot be cooled sufficiently, the control frequency is lowered so that the drive frequency of the compressor does not reach a predetermined level and the control components do not reach a predetermined temperature. It can be prevented from being damaged, and higher reliability can be secured.

  The third invention machine is arranged in a state separated from the control component in the control box, a cooling unit for cooling the air in the control box by heat exchange with the refrigerant, a fan for stirring the air in the control box, A control box temperature detection means for detecting the temperature in the control box; and a current control means for controlling a current flowing in the compressor for circulating the refrigerant. When the control box temperature detection means detects a temperature higher than a predetermined value, the current The control means is configured to reduce the current value. Even if the cooling unit cannot sufficiently cool the control part, the current value flowing to the compressor is lowered so that the control part does not reach a predetermined temperature or more. Can be prevented from being damaged, and higher reliability can be secured.

  The fourth invention further comprises fan rotation speed detection means for detecting the rotation speed of the fan in the third invention, and the current control means decreases the current value when the fan rotation speed detection means detects a rotation speed less than a predetermined value. Even if the rotation speed of the fan is reduced for some reason and the control component cannot be cooled sufficiently, the current flowing to the compressor is reduced below a predetermined level so that the control component does not reach a predetermined temperature or higher. Can be prevented from being damaged, and higher reliability can be secured.

  According to a fifth invention, in the first to fourth inventions, the cooling unit includes a fin structure having a plurality of fins and a refrigerant pipe attached to a side surface opposite to the fins of the fin structure. And the said fin and the groove | channel for refrigerant | coolant piping mounting | wearing are set as the structure formed in the same direction, A fin structure can be produced cheaply by pultrusion molding or extrusion molding.

  6th invention is set as the structure which has arrange | positioned the cooling unit in the 1st-5th invention below the control component, and has arrange | positioned the water receiving tray under the said cooling unit, Even if condensed water generate | occur | produces, This dew condensation water can prevent the control component from getting wet.

  According to a seventh invention, in the first to sixth inventions, the cooling unit directly attaches a fin structure having a plurality of fins to an appropriate position of a control board that is a part of the control component. It is configured to be exposed to the outside of the control box having a built-in cooling unit, and can be effectively cooled by providing the fin structure at a heating element installation portion that generates particularly high heat on the control board.

  According to an eighth aspect of the invention, the fan that stirs the air in the control box is arranged to blow air toward the fin structure of the cooling unit, and the cooling effect is obtained by diffusing the air cooled by the cooling unit throughout the control box. At the same time, the flow of air around the cooling unit becomes faster and it becomes difficult for condensed water to be generated on the surface of the cooling unit, so that the generation of condensed water can be effectively prevented.

  A ninth invention is an air conditioner having a compressor, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and a pipe through which refrigerant flows by connecting them, the air conditioner As a cooling device for cooling the control components housed in the control box, an air conditioner using the cooling device according to any one of the first to eighth inventions is provided, and condensation is prevented with an inexpensive configuration. However, it is possible to realize a highly reliable air conditioner capable of cooling the control components.

  According to a tenth aspect of the present invention, in the ninth air conditioner, the refrigerant of the cooling unit that cools the air in the control box in the cooling device is a refrigerant that flows through a pipe between the decompression device and the indoor heat exchanger, Since the low-pressure refrigerant flows by the device, vibrations can be reduced and the cost can be reduced by reducing the thickness of the pipe. Also, there is no need to provide a separate refrigerant passage dedicated to the cooling unit, and the configuration of the air conditioner can be simplified. be able to.

  In an eleventh aspect of the invention, in the ninth air conditioner, the refrigerant of the cooling unit that cools the air in the control box of the cooling device includes a compressor, an outdoor heat exchanger, a decompression device, an indoor heat exchanger, As a refrigerant diverted from a part of the refrigeration cycle, it is possible to prevent dew condensation and cool control components while suppressing a decrease in the cooling capacity of the air conditioner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a diagram schematically showing the configuration of a cooling device and an air conditioner according to the present invention. FIG. 2 is a diagram schematically showing the internal configuration of the control box according to the embodiment of the present invention. FIG. 3 is a perspective view of the cooling unit according to the embodiment of the present invention.

  As shown in FIG. 1, the air conditioner 20 includes a compressor 22, an outdoor heat exchanger 24, a decompression device 26, an indoor heat exchanger 28, and refrigerant pipes 30, 32, 34, and 36 connecting them. As the decompression device 26, an expansion valve or a capillary tube which is a copper capillary tube can be employed. The air conditioner 20 is divided into an outdoor unit that houses the compressor 22, the outdoor heat exchanger 24, and the decompression device 26, and an indoor unit that houses the indoor heat exchanger 28.

In the air conditioner 20, the refrigerant flows in order from the compressor 22 through the refrigerant pipes 30, 32, 34, and 36, the outdoor heat exchanger 24, the decompression device 26, the cooling unit 44 of the control box 42 described later, the indoor heat. A refrigeration cycle that returns to the compressor 22 through the exchanger 28 is realized.

  In the refrigeration cycle, the refrigerant flows through the refrigerant pipe 30 toward the outdoor heat exchanger 24 in a gas phase after being compressed by the compressor 22. Next, the refrigerant is deprived of heat by heat exchange with outdoor air via the outdoor heat exchanger 24, enters a liquid phase state, and flows through the refrigerant pipe 32 toward the decompression device 26. Subsequently, the refrigerant is expanded by the decompression device 26 to reduce the pressure, and flows through the refrigerant pipe 34 toward the indoor heat exchanger 28 via the cooling unit 44 of the control box 42 described later. Then, the refrigerant takes heat from the indoor air via the indoor heat exchanger 28 to be in a gas phase, and flows through the refrigerant pipe 36 toward the compressor 22.

  The air conditioner 20 includes a control component 40 (including a control board and various electronic components mounted on the control board) 40 that controls the refrigeration cycle, and a control box 42 that protects the control component 40. The control box 42 is provided in the outdoor unit.

  The “control component” referred to in the present invention is a component used for controlling the air conditioner 20, for example, an electronic component that controls the output of the compressor 22 and the throttle amount of the expansion valve as the pressure reducing device 26. Thus, it is not limited to a control board on which a plurality of electronic components are mounted, and refers to a component that needs to be cooled because it generates heat partially or entirely.

  The control component 40 is protected from, for example, dust or water by being accommodated in the control box 42. Therefore, the control box 42 is configured to be sealed so that dust and water do not enter the inside thereof. For example, in the control box 42, a hole through which a cable (not shown) extending from the control component 40 to the outside of the control box 42 passes is sealed. The control box 42 is preferably composed of a main body whose upper surface is open and a lid that covers the upper surface of the main body from the standpoint of maintainability, and is preferably sealed between the main body and the lid. For such a seal, a sponge-like resin material such as an EPT sheet can be used.

  Since the control component 40 is hermetically housed in the control box 42, it needs to be cooled. For this purpose, a cooling unit 44 is provided in the control box 42.

  The cooling unit 44 is configured to cool the air in the control box 42 by heat exchange with the refrigerant of the refrigeration cycle, and as shown in FIG. 2, the refrigerant pipe 34 and the fin structure attached to the refrigerant pipe 34. 46.

  Specifically, a part of the refrigerant pipe 34 passes through the control box 42 as shown in FIG. 1, and a plurality of plate-shaped fins 46a are provided in the part of the refrigerant pipe 34 in the control box 42 as shown in FIG. A fin structure 46 is provided. The cooling unit 44 is provided at a position away from the control component 40, and is controlled by exchanging heat between the air in the control box 42 and the refrigerant flowing in the refrigerant pipe 34 via the fin structure 46. The air in the box 42 is cooled. With such a cooling unit 44, the control component 40 is cooled via air.

  The refrigerant pipe constituting a part of the cooling unit 44 is preferably a refrigerant pipe 34 connecting the decompression device 26 and the indoor heat exchanger 28. By effectively using the refrigerant pipe 34, it is not necessary to separately provide a pipe through which the refrigerant flows through the control box 42 only for cooling the air in the control box 42.

Further, since the refrigerant pipe 34 is supplied with the refrigerant whose pressure is reduced by the decompression device 26, the pressure acting and the generated vibration are small compared to the other refrigerant pipes 30, 32, 36 shown in FIG. Therefore, it is possible to suppress vibration when the refrigerant pipe 34 is provided in the control box 42 as compared with the case where the other refrigerant pipes 30, 32, 36 are provided. Further, as a result, it is possible to reduce the thickness of the piping disposed in the control box 42, and there is a secondary merit that the material used can be reduced and the cost can be suppressed. Furthermore, as another reason, since the refrigerant flowing through the refrigerant pipe 34 is originally at a low pressure, the influence of the pressure loss due to the passage through the control box 42 (due to the lengthening) may be small.

  For example, as shown in FIG. 3, the fin structure 46 of the cooling unit 44 is integrally formed of metal such as aluminum. A plurality of plate-shaped fins 46 a are provided on one surface of the main body portion 46 b of the fin structure 46 so as to be arranged in parallel with each other at equal intervals. Further, the fin structure 46 includes a plurality of grooves 46c that are engaged with the portion of the refrigerant pipe 34 that is formed in a meandering shape on the surface opposite to the surface on which the fins 46a are provided.

  As shown in FIG. 3, the plurality of grooves 46c of the fin structure 46 are formed so as to extend in the same direction as the parallel direction of the plurality of fins 46a. Thereby, the fin structure 46 can be produced by pultrusion molding or extrusion molding, and can be produced at a lower cost than other production methods (for example, cutting).

  If possible, it is preferable that the cooling unit 44 be disposed apart from the control component 40 and below the control component 40 as shown in FIG. This is to ensure that the control component 40 is prevented from getting wet by the condensed water generated on the surface of the cooling unit 44 (specifically, the surface of the fin structure 46 and the surface of the refrigerant pipe 34).

  It is preferable to provide a dish-shaped water receiving tray 48 that receives the condensed water below the cooling unit 44 in case the condensed water generated on the surface of the cooling unit 44 drops. Thereby, it can prevent that the component of the air conditioner 20 located under the cooling unit 44 gets wet with dew condensation water. As shown in FIG. 2, a drain pipe 49 for discharging condensed water in the water tray 48 to the outside of the control box 42 may be connected to the bottom of the water tray 48.

  In addition to the cooling unit 44, this cooling device is provided with several means for cooling another control component 40 (another part of the control board).

  A fin structure 52, which is different from the fin structure 46 of the cooling unit 44, is directly attached to the control component 40, particularly to a portion that generates high heat (for example, a heating element installation portion) of the control board that is a part of the control component 40. ing. The fin structure 52 is configured to exchange heat between the control component 40 and the air outside the control box 42.

  Specifically, like the fin structure 46 of the cooling unit 44, the fin structure 52 is made of, for example, aluminum and includes a plurality of fins 52a. The fins 52 a of the fin structure 52 are configured to be exposed to the outside of the control box 42. The fins 52a are provided so as to be located leeward of a fan (not shown) for discharging the air around the outdoor heat exchanger 24 to the outside of the outdoor unit. Through such a fin structure 52, the control component 40 is cooled by a fan (not shown) of the outdoor unit.

  A fan 54 for forcibly stirring the air in the control box 42 is provided in the control box 42. The fan 54 agitates the air in the control box 42 to make the temperature distribution in the control box 42 uniform and increase the cooling efficiency of the control component 40. The drive of the fan 54 is controlled by fan drive control means 56 attached to the control component 40.

  The fan 54 can also suppress the generation of condensed water on the surface of the cooling unit 44 by forcibly stirring the air in the control box 42. More specifically, since the air around the cooling unit 44 is moved by the fan 54, the condensed water is less likely to be generated on the surface of the cooling unit 44 than when the fan 54 is not present, and the condensed water is generated. It is difficult to grow greatly.

  As shown in FIG. 2, the fan 54 is preferably arranged so as to blow air toward the fin structure 46 of the cooling unit 44. When the fan 54 blows air toward the fin structure 46, the air cooled by the cooling unit 44 is diffused throughout the control box 42. Further, the flow of air around the cooling unit 44 becomes faster, and condensed water is less likely to be generated on the surface of the cooling unit 44.

  Furthermore, in order to suppress the movement of heat from the outside to the inside of the control box 42, the internal space of the control box 42 is preferably insulated by a heat insulating material (not shown). The heat insulating material is provided on the outer surface of the control box 42, for example. By this heat insulating material, the cooling effect with respect to the control component 40 by the cooling unit 44 improves compared with the case where there is no heat insulating material. The heat insulating material is preferably provided on the outer surface of the control box 42 from the viewpoint of effective use of the space in the control box 42, but may be provided on the inner surface of the control box 42.

  Examples of the heat insulating material include fiber heat insulating materials such as glass wool, foam heat insulating materials such as urethane foam, and vacuum heat insulating materials. It is preferable to use a vacuum heat insulating material having higher heat insulating performance than the heat insulating material. Examples of the vacuum heat insulating material include those obtained by packing glass fibers with a laminate film and reducing the internal pressure thereof.

  As shown in FIG. 1, in addition to the fan drive control means 56, the control component 40 includes a control box temperature detection means 60 that detects the temperature in the control box 42, and a frequency control means 62 that controls the frequency of the compressor 22. Current control means 64 for controlling the current flowing through the compressor 22 is provided.

  When the temperature in the control box 42 becomes equal to or higher than the predetermined temperature T1, the control box internal temperature detection means 60 detects this, and the frequency control means 62 lowers the frequency of the compressor 22 to a predetermined value or lower. Thereby, for example, even when the fan 54 has its rotational speed lowered or stopped for some reason, and the cooling device including the fan 54 and the cooling unit 44 cannot sufficiently cool the control component 40, the drive frequency of the compressor 22 is reduced. It is possible to reduce the heat generation amount of the control component 40 and lower the temperature thereof so that the control component 40 is not damaged. This operation is performed even when the fan drive control means 56 functions properly and the fan 44 is driven. That is, if the control component 40 cannot be cooled by the fan 54 for some reason, or if it is cooled, but the degree of cooling is poor, the frequency control means 62 sets the frequency of the compressor 22 to a predetermined value or less. The heat generation amount of the control component 40 is suppressed and the breakage is prevented. When the control box internal temperature detection means 60 detects a temperature lower than the predetermined temperature T2 different from T1, the frequency control means 62 increases the frequency of the compressor 22 to a predetermined value or increases it to the original frequency. Drive.

  Two different temperatures T1 and T2 are provided as temperature thresholds for changing the frequency of the compressor 22. When T1 and T2 are the same temperature, the temperature in the control box 42 repeats a slight temperature change. In order to avoid this, the operation of lowering the frequency and the operation of raising the frequency are frequently repeated, and the operation of the air conditioner 20 is frequently repeated in a short time.

Further, as another means for suppressing the temperature rise of the control component 40, when the temperature in the control box 42 becomes equal to or higher than the predetermined temperature T3, the control box internal temperature detection means 60 detects this, and the current control means 64 causes the compressor. The current flowing through 22 is reduced to a predetermined value or less. Thus, for example, even if the fan 54 has its rotational speed lowered or stopped for some reason, and the cooling device including the fan 54 and the cooling unit 44 cannot sufficiently cool the control component 40, the current flowing through the compressor 22 is reduced. It is possible to reduce the heat generation amount of the control component 40 and lower the temperature thereof so that the control component 40 is not damaged. When the control box internal temperature detection means 60 detects a predetermined temperature T4 or lower that is different from T3, the current control means 64 increases the current flowing through the compressor 22 to a predetermined value or returns to the original current. Raise and drive.

  Two different temperatures T3 and T4 are provided as temperature thresholds for changing the current flowing through the compressor 22. When T3 and T4 are the same temperature, the temperature in the control box 42 changes slightly. If it repeats, it will repeat the operation | movement which lowers | hangs the electric current which flows into the compressor 22, and the operation | movement raised frequently, and it will lead to repeating operation | movement of the air conditioner 20 frequently in a short time, but it is for avoiding this. .

  According to the present embodiment, even if the fan 54 has its rotational speed lowered or stopped for some reason and the cooling device cannot sufficiently cool the control component 40, the drive frequency of the compressor 22 is reduced or compressed. The current flowing through the machine 22 can be lowered to lower the temperature of the control component 40 so that the control component 40 is not damaged.

  Although the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, the cooling unit 44 is disposed below the control component 40 in the control box 42 as shown in FIG. 2, but dropped on the surface of the cooling unit 44 by the forced stirring of the air in the control box 42 by the fan 54. If such condensed water does not occur, the cooling unit 44 can be disposed above the control component 40. However, in this case, it is preferable to arrange the water tray 48 between the cooling unit 44 and the control component 40.

  In the above description, the air conditioner 20 in which the refrigerant flows in the order of the compressor 22, the outdoor heat exchanger 24, the decompression device 26, and the indoor heat exchanger 28, that is, the air conditioner 20 that performs the cooling operation has been described. The present invention is not limited to this. The present invention is also applicable to the air conditioner 20 in which the refrigerant flows in the order of the compressor 22, the indoor heat exchanger 28, the decompression device 26, and the outdoor heat exchanger 24, that is, the air conditioner 20 that performs the heating operation. It is.

  Furthermore, in the case of the above-described embodiment, the cooling unit 44 is configured to cool the air in the control box 42 using all the refrigerant flowing in the refrigerant pipe 34, but the present invention is not limited thereto. Absent. A part of the refrigerant flowing in any one of the refrigerant pipes 30, 32, 34, 36 may be used for cooling the air in the control box 42.

  For example, a bypass pipe that branches from the refrigerant pipe 34 near the downstream side of the decompression device 26, passes through the control box 42, and reaches the refrigerant pipe 34 near the upstream side of the indoor heat exchanger 28. And the cooling unit 44 may be configured by attaching a fin structure to the bypass pipe. In this case, the cooling capacity of the air conditioner 20 is improved, although the cooling capacity of the control component 40 is reduced as compared with the above-described embodiment.

Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various variations and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein, so long as they do not depart from the scope of the present invention according to the appended claims.

(Embodiment 2)
FIG. 4 is a diagram schematically showing a configuration of an air conditioner according to the second embodiment of the present invention. In FIG. 4, reference numeral 66 denotes fan rotation speed detection means for detecting the rotation speed of the fan 54. Only the parts different from the first embodiment will be described below.

  When the fan rotation speed detection means 66 detects a rotation speed below a predetermined value, the frequency control means 62 that controls the drive frequency of the compressor sets the frequency to a predetermined value or lower, and the rotation speed of the fan 44 is Even if it becomes small due to the cause or the rotation of the fan 44 stops and the control component 40 cannot be cooled sufficiently, the drive frequency of the compressor 22 is lowered so that the temperature of the control component 40 does not exceed a predetermined temperature. It can be protected, and higher reliability can be secured. When the rotational speed of the fan 44 reaches a predetermined rotational speed different from the above, the frequency value is increased or returned to the original frequency.

  Further, when the fan rotation speed detection means 66 detects a rotation speed below a predetermined value, the current control means 64 for controlling the current flowing through the compressor 22 sets the current to a predetermined value or lower. Is reduced for some reason, or even if the fan 44 stops and the control component 40 cannot be cooled sufficiently, the current flowing through the compressor 22 is reduced to protect the temperature of the control component 40 from exceeding a predetermined level. Higher reliability can be ensured. When the rotational speed of the fan 44 reaches a predetermined rotational speed different from the above, the current value is increased or returned to the original current value.

  The present invention provides a highly reliable cooling device and air conditioner that can protect a control component so that the control component does not reach a predetermined temperature or more even when the cooling device cannot sufficiently cool the control component. It can be realized and can be applied not only to an air conditioner but also to a refrigerant handling refrigerant such as a refrigerator as long as the air in the control box is cooled using the refrigerant.

DESCRIPTION OF SYMBOLS 22 Compressor 24 Outdoor heat exchanger 26 Pressure reducing device 28 Indoor heat exchanger 28 Indoor heat exchanger 40 Control part 42 Control box 44 Cooling unit 54 Fan 56 Fan drive control means 60 Control box temperature detection means 62 Frequency control means 64 Current Control means 66 Fan speed detection means

Claims (11)

A cooling unit that is disposed in the control box in a state of being separated from the control component and that cools the air in the control box by heat exchange with the refrigerant, a fan that stirs the air in the control box, A control box temperature detecting means for detecting temperature; and a frequency control means for controlling a drive frequency of the compressor for circulating the refrigerant, and the frequency control means when the control box temperature detecting means detects a temperature of a predetermined value or more. A cooling device that lowers the frequency. The cooling device according to claim 1, further comprising fan rotation speed detection means for detecting a rotation speed of the fan, wherein the frequency control means decreases the frequency when the fan rotation speed detection means detects a rotation speed equal to or lower than a predetermined value. A cooling unit that is disposed in the control box in a state of being separated from the control component and that cools the air in the control box by heat exchange with the refrigerant, a fan that stirs the air in the control box, A control box temperature detecting means for detecting temperature; and a current control means for controlling a current flowing in the compressor for circulating the refrigerant; and when the control box temperature detecting means detects a temperature higher than a predetermined value, the current control means. A cooling device that lowers the current value. 4. The cooling device according to claim 3, further comprising a fan rotation speed detection means for detecting a rotation speed of the fan, wherein the current control means decreases the current value when the fan rotation speed detection means detects a rotation speed equal to or less than a predetermined value. The cooling unit includes a fin structure having a plurality of fins, and a refrigerant pipe mounted on the opposite side of the fin structure to the fin, and the fin and the groove for installing the refrigerant pipe are in the same direction. The cooling device according to any one of claims 1 to 4, wherein the cooling device is formed. The cooling device according to any one of claims 1 to 5, wherein the cooling unit is disposed below the control component, and a water tray is disposed below the cooling unit. The cooling unit has a structure in which a fin structure having a plurality of fins is directly attached to an appropriate position of a control board, which is a part of the control component, and the fins of the fin structure are configured to be exposed to the outside of the control box incorporating the cooling unit. Item 7. The cooling device according to any one of Items 1 to 6. The cooling device according to any one of claims 1 to 7, wherein the fan that stirs the air in the control box is arranged to blow air toward the fin structure of the cooling unit. An air conditioner having a compressor, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and a pipe through which refrigerant flows by connecting them, and is housed in a control box of the air conditioner The air conditioner using the cooling device of any one of Claims 1-8 as a cooling device which cools the control components made. The air conditioner according to claim 9, wherein the refrigerant of the cooling unit that cools the air in the control box in the cooling device is a refrigerant that flows through a pipe between the decompression device and the indoor heat exchanger. The refrigerant of the cooling unit that cools the air in the control box in the cooling device is a refrigerant that is diverted from a part of the refrigeration cycle including the compressor, the outdoor heat exchanger, the decompression device, and the indoor heat exchanger. The air conditioner according to claim 9.