JP6529600B2 - Outdoor unit of air conditioner - Google Patents

Description

  The present invention relates to an outdoor unit of an air conditioner having a control box containing electrical components.

  2. Description of the Related Art Conventionally, there have been outdoor units of an air conditioning apparatus in which a rectifier circuit, a DC reactor, an inverter and the like, which are electrical components of a control device, are accommodated in a control box. And the outdoor unit of the air conditioning apparatus which arrange | positions the control box on the air path in an outdoor unit, and cools the said electrical component is proposed (for example, refer patent document 1).

Unexamined-Japanese-Patent No. 11-75363 gazette

  In recent years, the range of the operating environment of the air conditioner has become wide as the sales area has expanded. And, in addition to the use in the environment of high temperature outside air where cooling of the electric component is required as in the past, along with the widening of the operation environment, the case of being used in the environment of low temperature outside air below -20 ° C It has happened.

  Under low temperature outside air, the environmental temperature inside the control box may decrease due to cold air from the evaporator when starting the air conditioner or operating the air conditioner, and it may fall below the temperature limit of electrical components. . As a result, there has been a problem that the deterioration of the respective electric components and the reduction of the lifespan are caused.

  The present invention has been made to solve the problems as described above, and the environmental temperature in the control box and the temperature of electrical components even when the air conditioner is operated in a cryogenic environment. It is an object of the present invention to obtain an outdoor unit of an air conditioning apparatus which keeps the

An outdoor unit of an air conditioning apparatus according to the present invention comprises a housing, a control box disposed in the housing, a control box for housing a control board, a temperature sensor for detecting the temperature inside the control box, and the control box. A heat generating device for heating the inside, and the two temperature sensors are provided above and below the control box, and the heat generation device is a temperature sensor detected by a temperature sensor below the temperature sensor The drive is started when the temperature falls below the lower limit value of the allowable temperature of the control board mounted on the control box, and the control detected by the upper temperature sensor among the temperature sensors is mounted on the control box The driving is stopped when the upper limit of the allowable temperature of the substrate is exceeded .

  According to the present invention, the heat generating device is configured to start driving when the temperature detected by the temperature sensor falls below the lower limit value of the allowable temperature of the control substrate. By doing this, even if the air conditioner is operated in a cryogenic environment, the environmental temperature in the control box and the temperature of the electrical components are maintained at a certain level or higher, and the deterioration and life of each electrical component An outdoor unit of an air conditioner can be obtained which suppresses the decrease of

It is a schematic circuit block diagram which shows an example of a circuit configuration containing the outdoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a refrigerant circuit figure showing the flow of the refrigerant at the time of air conditioning operation mode of the outdoor unit of the air conditioning device concerning Embodiment 1 of the present invention. It is a refrigerant circuit figure which shows the flow of the refrigerant | coolant at the time of heating operation mode of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a schematic internal block diagram of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a general | schematic side surface sectional view of the control box provided in the inside of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a general | schematic side surface sectional view of the control box provided in the inside of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the state of the Peltier device provided in the inside of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention.

  Hereinafter, an embodiment of the outdoor unit of the air conditioner of the present invention will be described with reference to the drawings. In addition, the form of drawing is an example and does not limit this invention. The same reference numerals in the drawings denote the same or corresponding parts, which are common to the entire text of the specification. Furthermore, in the following drawings, the relationship of the size of each component may differ from an actual thing.

Embodiment 1
[Configuration of air conditioner]
FIG. 1 is a schematic circuit diagram showing an example of a circuit configuration including an outdoor unit of the air conditioning apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the air conditioner 100 has an outdoor unit 1 and an indoor unit 2, and the outdoor unit 1 and the indoor unit 2 are connected by a refrigerant main pipe 3 and a refrigerant main pipe 7.

[Configuration of Outdoor Unit 1]
In the outdoor unit 1, a compressor 5, a switching valve 8 such as a four-way valve, and an outdoor heat exchanger 6 are connected by a refrigerant pipe 4 and mounted. In addition, the outdoor fan 9 and the control box 22 are mounted on the outdoor unit 1. The compressor 5 sucks a low-temperature low-pressure refrigerant and compresses the refrigerant to a high-temperature high-pressure state, and is constituted of, for example, an inverter compressor or the like capable of capacity control. An outdoor fan 9 and a control box 22 are provided near the outdoor heat exchanger 6, and the outdoor fan 9 blows air to the outdoor heat exchanger 6. The outdoor heat exchanger 6 functions as a condenser during cooling operation, functions as an evaporator during heating operation, and performs heat exchange between air supplied from an outdoor blower 9 such as a fan and refrigerant, for example. It is. The switching valve 8 has a first port 8a, a second port 8b, a third port 8c, and a fourth port 8d, and by connecting the ports to each other, the flow of refrigerant and the heating operation in the cooling operation mode described later It switches between the flow of the refrigerant in the mode.

[Configuration of indoor unit 2]
The indoor unit 2 is equipped with an indoor fan 12, an indoor heat exchanger 10, and a expansion device 11. The indoor unit 2 is connected to the outdoor unit 1 through the refrigerant main pipe 3 and the refrigerant main pipe 7 so that the refrigerant flows in or out. As described above, the refrigerant circuit of the air conditioner 100 is configured by sequentially connecting the compressor 5, the outdoor heat exchanger 6, the expansion device 11, and the indoor heat exchanger 10 through the pipes.

  The indoor heat exchanger 10 performs heat exchange between the refrigerant and the air supplied from the indoor blower 12 such as a fan, for example, to generate heating air or cooling air to be supplied to the indoor space. is there. The throttling device 11 has a function as a pressure reducing valve or an expansion valve, decompresses the refrigerant and expands it, and it may be configured by a device whose opening degree can be variably controlled, such as an electronic expansion valve.

[Cooling operation mode]
FIG. 2 is a refrigerant circuit diagram showing the flow of the refrigerant in the cooling operation mode of the outdoor unit of the air conditioning apparatus according to Embodiment 1 of the present invention. As shown in FIG. 2, in the cooling operation mode, in the switching valve 8, the first port 8a and the second port 8b communicate with each other, and the third port 8c and the fourth port 8d communicate with each other. It becomes. Thus, the refrigerant flows in the direction indicated by the solid arrow in FIG.

  In the cooling operation mode, the low-temperature low-pressure refrigerant is compressed by the compressor 5 and discharged as a high-temperature high-pressure gas refrigerant. The high temperature and high pressure gas refrigerant discharged from the compressor 5 flows into the outdoor heat exchanger 6 via the switching valve 8. The high-temperature high-pressure gas refrigerant flowing into the outdoor heat exchanger 6 is condensed while being radiated to the outdoor air, and becomes a high-pressure liquid refrigerant. At this time, the outdoor air heated by the outdoor heat exchanger 6 passes through the control box 22 and is discharged to the outside of the outdoor unit 1 by the outdoor blower 9. The high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 6 flows out of the outdoor unit 1, flows through the refrigerant main pipe 7, and flows into the indoor unit 2.

  The high-pressure liquid refrigerant that has flowed into the indoor unit 2 is reduced in pressure to a low-temperature low-pressure two-phase refrigerant by the expansion device 11 and then flows into the indoor heat exchanger 10 acting as an evaporator. Then, the low temperature and low pressure two-phase refrigerant cools the room air by absorbing heat from the room air, and becomes a low temperature and low pressure gas refrigerant. The low-temperature low-pressure gas refrigerant flowing out of the indoor heat exchanger 10 flows into the outdoor unit 1 through the refrigerant main pipe 3. The refrigerant flowing into the outdoor unit 1 passes through the switching valve 8 and is sucked into the compressor 5. The cooling operation mode is performed by circulating the refrigerant in this manner.

[Heating mode]
FIG. 3 is a refrigerant circuit diagram showing the flow of the refrigerant in the heating operation mode of the outdoor unit of the air conditioning apparatus according to Embodiment 1 of the present invention. As shown in FIG. 3, in the heating operation mode, in the switching valve 8, the first port 8 a and the third port 8 c communicate with each other, and the second port 8 b and the fourth port 8 d communicate with each other. It becomes. In this way, the refrigerant flows in the direction indicated by the solid arrow in FIG.

  In the heating operation mode, the low-temperature low-pressure refrigerant is compressed by the compressor 5 and discharged as a high-temperature high-pressure gas refrigerant. The high temperature and high pressure gas refrigerant discharged from the compressor 5 flows into the indoor unit 2 through the refrigerant main pipe 3 via the switching valve 8. The high-temperature high-pressure gas refrigerant that has flowed into the indoor unit 2 dissipates heat to the indoor air by the indoor heat exchanger 10, becomes a high-pressure liquid refrigerant, and flows into the expansion device 11. Then, after being decompressed to a low temperature and low pressure two-phase refrigerant by the expansion device 11, the refrigerant flows out from the indoor unit 2, flows through the refrigerant main pipe 7, and flows into the outdoor unit 1.

  The low-temperature low-pressure two-phase refrigerant flowing into the outdoor unit 1 absorbs heat from the outdoor air in the outdoor heat exchanger 6 to become a low-temperature low-pressure gas refrigerant. At this time, the outdoor air cooled by the outdoor heat exchanger 6 passes through the control box 22 and is discharged to the outside of the outdoor unit 1 by the outdoor blower 9. The low-temperature low-pressure gas refrigerant leaving the outdoor heat exchanger 6 passes through the switching valve 8 and is sucked into the compressor 5. The heating operation mode is performed by circulating the refrigerant in this manner.

  In the first embodiment, an example in which the air conditioning apparatus 100 can perform both the cooling operation mode and the heating operation mode has been described. However, this invention is not limited to this, For example, when using the air conditioning apparatus 100 in an extremely cold district, it is good also as composition of a refrigerant circuit which operates only heating operation mode. In this case, there is no need to provide the switching valve 8, and the refrigerant circuit can be simplified, and the cost can be reduced.

[Description of control box cooling]
FIG. 4 is a schematic internal configuration diagram of the outdoor unit of the air conditioning apparatus according to Embodiment 1 of the present invention. As shown in FIG. 4, the outdoor unit 1 of the air conditioning apparatus 100 includes a housing 21 and an outdoor fan 9 provided above the housing 21. Inside the housing 21, a control box 22, an outdoor heat exchanger 6, a compressor 5 (not shown), and a switching valve 8 (not shown) are provided. In the casing 21, an air passage 26 is formed which serves as a passage of outdoor air for blowing air to the outdoor heat exchanger 6. The outdoor blower 9 blows outdoor air to the air passage 26 formed in the housing 21. Then, as the outdoor blower 9 provided at the upper part of the housing 21 is rotationally driven, outdoor air flows from the lower side to the upper side in the housing 21 as shown in the air passage 26.

  The control box 22 is provided with a heat sink 23a and a heat sink 23b on the outer surface in contact with the air passage 26. When the outdoor blower 9 is in operation, the air passage 26 is turned upward from the lower side after passing through the outdoor heat exchanger 6. The heat sink 23a and the heat sink 23b are cooled by the outdoor air flowing toward it. Although an example in which two heat sinks are provided in the first embodiment is shown, the present invention is not limited to this, and one or three or more heat sinks may be provided. In the first embodiment, the outdoor fan 9 is provided on the upper part of the housing 21. However, the present invention is not limited to this, and the outdoor fan 9 may be provided in a place other than the upper part of the housing 21.

  FIG. 5 is a schematic side sectional view of a control box provided inside the outdoor unit of the air conditioning apparatus according to Embodiment 1 of the present invention. As shown in FIG. 5, the control box 22 includes a heat sink 23a, a heat sink 23b, a control board 27a, a control board 27b, a temperature sensor 28a, a temperature sensor 28b, and an electric heater 31. The heat sink 23a is disposed above the heat sink 23b. The control board 27a is disposed above the control board 27b. Further, the temperature sensor 28a is disposed above the temperature sensor 28b. In the first embodiment, an example in which two heat sinks, two control boards, and two temperature sensors are provided is shown. However, the present invention is not limited to this, and three or more may be provided. The same applies to the second embodiment described later.

  The control board 27a and the control board 27b control the air conditioner 100, and are, for example, boards on which an inverter circuit, a harmonic suppression circuit, and the like are formed. The control board 27a is connected to the back plate 29 via the base 24a. The control board 27b is connected to the back plate 29 via the base 24b. The heat sink 23 a and the control board 27 a are provided adjacent to each other via the back plate 29 and the base 24 a of the control box 22. The heat sink 23 b and the control board 27 b are provided adjacent to each other via the back plate 29 and the base 24 b of the control box 22. The electrical components formed on the control board 27a and the control board 27b are cooled via the heat sink 23a and the heat sink 23b which are cooled by the wind passing through the air passage 26.

  Here, the distribution state of the environmental temperature in the control box 22 will be described. At the time of operation of the outdoor unit 1 after the time of energization, heat generation of electrical components such as an inverter circuit causes a difference in the density of air inside the control box 22. Then, due to the nature of the difference in density of air, a temperature distribution is generated in the vertical direction inside the control box 22, and the temperature in the upper side inside the control box 22 becomes high. On the other hand, the lower side inside the control box 22 has a lower temperature. In addition, the outdoor heat exchanger 6 used in the heating operation, which is used under the condition of low temperature outside air, functions as an evaporator, and the temperature of the refrigerant flowing inside the outdoor heat exchanger 6 becomes lower than the outdoor air temperature. ing. When the heating operation is performed under the condition of low temperature outside air, the outdoor air cooled through the outdoor heat exchanger 6 passes through the air passage 26 and hits the lower part of the control box 22 to further enhance the above-mentioned temperature distribution.

  Therefore, a temperature sensor 28 b that detects a drop in the environmental temperature inside the control box 22 is provided inside the control box 22. The temperature sensor 28 b is disposed below the control box 22, particularly at the bottom of the control board 27 b where the lower limit of the temperature range is expected. By doing this, while reducing the measurement points inside the control box 22, grasping how many temperature conditions of the control board 27a and the control board 27b provided inside the control box 22 are more than Can.

  Here, when the environmental temperature inside the control box 22 is lowered, the electric heater 31 is used as a control box 22 as a means for raising the temperature of the control board 27a and the control board 27b and the environmental temperature inside the control box 22. Located below the interior of the By arranging the electric heater 31 below the inside of the control box 22, particularly at the bottom, it is possible to heat the control board 27b provided below the inside of the control box 22 in which the environmental temperature tends to decrease. Further, with regard to the control substrate 27a provided above the control substrate 27b, the control substrate 27a can be heated by the air warmed by the electric heater 31 rising due to natural convection. By thus installing the electric heater 31 below the inside of the control box 22, the entire control box 22 can be efficiently heated. The electric heater 31 corresponds to the "heat generating device" in the present invention.

Next, the operation of the electric heater 31 will be described.
In the outdoor unit 1 when the outside air temperature is in the low temperature state, the driving of the electric heater 31 is started when the temperature detected by the temperature sensor 28b falls below the lower limit value of the control substrate 27a and the control substrate 27b. . Then, when the temperature detected by the temperature sensor 28b reaches a certain value or more, for example, when the temperature exceeds the upper limit of the allowable temperature of the control board 27a and the control board 27b, the driving of the electric heater 31 is stopped. . Here, the above-mentioned allowable temperature refers to a temperature range in which the control boards 27a and 27b operate normally and no failure or the like occurs. By doing as described above, in the outdoor unit 1 when the outside air temperature is in the low temperature state, the environmental temperature inside the control box 22, the temperatures of the control board 27a and the control board 27b are maintained above a certain level, It is possible to suppress the deterioration of the product and the reduction of the life.

  On the other hand, when the air conditioning apparatus 100 is operated under the condition that the outside air temperature is high, in order to protect the upper limit of the temperature range of the control board 27a and the control board 27b, the upper side of the control box 22, especially the top of the control board 27a. It is preferable to install a temperature sensor 28a at the top. Then, when the temperature detected by the temperature sensor 28a exceeds the upper limit value of the allowable temperature of the control board 27a and the control board 27b, the operating load of the outdoor unit 1 is reduced to reduce the temperature of the control board 27a and the control board 27b. It is possible to suppress the rise.

[Effect of Embodiment 1]
From the above, according to the first embodiment, the outdoor unit 1 of the air conditioning apparatus 100 includes the case 21 and the control box 22 disposed in the case 21 and housing the control boards 27a and 27b; The control box 22 includes temperature sensors 28a and 28b for detecting the temperature inside the control box 22, and a heating device for heating the inside of the control box 22. The heating device has a temperature detected by the temperature sensors 28a and 28b as the control boards 27a and 27b. Driving is started when the temperature falls below the lower limit value of the allowable temperature of. By doing this, it is possible to obtain the outdoor unit 1 of the air conditioning apparatus 100 that maintains the environmental temperature in the control box 22 and the temperature of the electrical components at a certain level or more, and suppresses the deterioration of the electrical components and the decrease in life.

  Further, two temperature sensors 28 a and 28 b are provided at the upper and lower sides in the control box 22. By doing this, the environmental temperature inside the control box 22 can be efficiently detected by a small temperature sensor.

  In addition, the electric heater 31 is provided below the control box 22. In this way, the air warmed under the control box 22 ascends by natural convection, whereby the air and electrical components above the control box 22 can be efficiently warmed.

  The electric heater 31 starts driving when the temperature detected by the lower temperature sensor 28b of the temperature sensors 28a and 28b falls below the lower limit of the allowable temperature of the control boards 27a and 27b mounted on the control box 22. And the drive is stopped when the temperature detected by the upper temperature sensor 28a of the temperature sensors 28a and 28b exceeds the upper limit of the allowable temperature of the control boards 27a and 27b mounted on the control box 22. Do. By doing this, it is possible to obtain the outdoor unit 1 of the air conditioning apparatus 100 that keeps the environmental temperature in the control box 22 and the temperature of the electrical components constant, and suppresses the deterioration of the electrical components and the reduction of the life.

Second Embodiment
The basic configuration of the outdoor unit of the air conditioning apparatus according to the second embodiment is the same as that of the outdoor unit of the air conditioning apparatus according to the first embodiment. Form 2 will be described. The difference between the first embodiment and the second embodiment is that the heat generating device is formed of a Peltier element.

  FIG. 6 is a schematic side sectional view of a control box provided inside the outdoor unit of the air conditioning apparatus according to Embodiment 2 of the present invention. As shown in FIG. 6, the control box 22 controls the air conditioner 100. The control box 22 internally includes a heat sink 23c, a heat sink 23d, a control board 27a, a control board 27b, a temperature sensor 28a, a temperature sensor 28b, a Peltier element 29a, and a Peltier element 29b. The Peltier element 29a is provided above the Peltier element 29b.

  The Peltier element 29a is disposed on the inner wall surface of the control box 22 so as to be in contact with the control substrate 27a via the heat sink 23c. That is, the Peltier element 29a constitutes a base of the control board 27a. Similarly, the Peltier element 29b is disposed on the inner wall surface of the control box 22 so as to be in contact with the control board 27b via the heat sink 23d. That is, the Peltier element 29b constitutes a base of the control board 27b.

[Peltier element]
In the outdoor unit 1 under a condition where the outside air temperature is low, when the detection temperature of the temperature sensor 28b installed below the control box 22 becomes lower than a predetermined temperature, the surface of the Peltier element 29b in contact with the heat sink 23d Peltier element 29b is charged so as to be a hot surface. Then, when the temperature detected by the temperature sensor 28 b becomes equal to or higher than a predetermined temperature, the application of electricity to the Peltier element 29 b is stopped. In this way, the environmental temperature inside the control box 22 and the temperatures of the control board 27a and the control board 27b can be maintained at a certain level or higher even when used under conditions of low temperature outside air, and the respective electrical components of the control circuit And the reduction of the service life of the

  On the other hand, in the outdoor unit 1 under a condition where the outside air temperature is high, the temperature sensor 28a rises above the control box 22, especially when it is operated, if necessary, in order not to exceed the allowable upper limit temperature of each electrical component. Are placed at the top of the control board 27a that is concerned. When the temperature detected by the temperature sensor 28a exceeds the allowable upper limit temperature of the control board 27a, the operation load of the outdoor unit 1 is reduced to suppress the temperature rise inside the control box 22 and protect the electrical components. be able to.

  In addition, in the outdoor unit 1 under a situation where the outside air temperature is high, the operation load of the outdoor unit 1 may be high, and the temperature of the control board 27a may exceed the allowable upper limit temperature. In this case, the Peltier element 29a is charged such that the surface in contact with the heat sink 23c of the Peltier element 29a is a cooling surface, thereby cooling the control board 27a without reducing the operation load of the outdoor unit 1. It can also be done.

  The Peltier device 29a and the Peltier device 29b described above can exchange the cooling surface with the heating surface by changing the polarity of the charge. Therefore, the temperature state inside the control box 22 is detected based on the temperatures detected by the temperature sensor 28a and the temperature sensor 28b, and it is determined whether or not the Peltier element 29a and Peltier element 29b need to be charged. It is possible to switch. By doing this, it is possible to realize an increase in the temperature of the control boards 27a and 27b under the condition where the outside air temperature is low. Further, it is possible to realize the suppression of the temperature rise of the control boards 27a and 27b under the condition that the outside air temperature is high.

[Operation of Peltier element]
FIG. 7 is a view showing the state of a Peltier element provided inside the outdoor unit of the air conditioning apparatus according to Embodiment 2 of the present invention. As shown in FIG. 7, let D be a threshold value of the allowable upper limit temperature required to protect the control substrate 27 a at the temperature detected by the temperature sensor 28 a. On the other hand, let C be a threshold value of the lower limit allowable temperature required to protect the control substrate 27a at the temperature detected by the temperature sensor 28a. When the temperature detected by the temperature sensor 28a exceeds the threshold value D, the Peltier element 29a is charged such that the surface in contact with the heat sink 23c, that is, the control substrate 27a side becomes a cooling surface. When the temperature detected by the temperature sensor 28a falls below the threshold value C, the Peltier element 29a is charged such that the surface in contact with the heat sink 23c, that is, the control substrate 27a side becomes a heating surface. On the other hand, when the temperature detected by the temperature sensor 28a is between D and C of the threshold value, the Peltier element 29a is not charged.

  Let B be a threshold value of the allowable upper limit temperature required to protect the control board 27b at the temperature detected by the temperature sensor 28b. On the other hand, let A be a threshold value of the allowable lower limit temperature necessary to protect the control board 27b at the temperature detected by the temperature sensor 28b. When the temperature detected by the temperature sensor 28b exceeds the threshold value B, the Peltier element 29b is charged such that the surface in contact with the heat sink 23d, that is, the control substrate 27b side becomes a cooling surface. When the temperature detected by the temperature sensor 28b falls below the threshold A, the Peltier element 29b is charged such that the surface in contact with the heat sink 23d, that is, the control substrate 27b, is the heating surface. On the other hand, when the temperature detected by the temperature sensor 28b is between the threshold values B and A, the Peltier element 29b is not charged.

  Next, a specific operation example of the Peltier device 29a and the Peltier device 29b will be described with reference to FIG. As shown in FIG. 7, in the case of the temperature sensor state 120a, the temperature detected by the temperature sensor 28b is lower than the threshold A, so that the Peltier element 29b is in contact with the heat sink 23d as a heating surface. The element 29b is charged. On the other hand, in the case of the temperature sensor state 120a, since the temperature detected by the temperature sensor 28a is between the threshold values C and D, the Peltier element 29a is not charged. When the temperature inside the control box 22 rises due to the heating of the Peltier element 29b and the temperature sensor state 120b is reached, the application of electricity to the Peltier element 29b is completed.

  As described above, by using the Peltier element 29a and the Peltier element 29b for cooling the control board 27a and the control board 27b, it is not necessary to provide a heat sink on the outer surface of the control box 22, and the control box can be made more compact. . In addition, the restriction that the control box has to be installed along the air path in the outdoor unit can be eliminated, and the design freedom of the structural arrangement of the outdoor unit of the air conditioner can be improved.

[Effect of Embodiment 2]
From the above, according to the second embodiment, the heating device is configured by the Peltier elements 29a and 29b, and the Peltier elements 29a and 29b serve as the bases of the control boards 27a and 27b mounted on the control box 22. Configured. In this way, in addition to the effects of the first embodiment, it is not necessary to provide a heat sink on the outer surface of the control box 22, and the control box can be made more compact. In addition, the restriction that the control box has to be installed along the air path in the outdoor unit can be eliminated, and the design freedom of the structural arrangement of the outdoor unit of the air conditioner can be improved.

  Further, when the detection temperature of the temperature sensors 28a and 28b exceeds the allowable upper limit temperature of the control substrates 27a and 27b, the Peltier device is driven as the cooling surface on the control substrates 27a and 27b side, and the detection temperatures of the temperature sensors 28a and 28b are When the temperature falls below the allowable lower limit temperature of the control boards 27a and 27b, the control boards 27a and 27b are driven as heating surfaces. By doing this, it is possible to obtain the outdoor unit 1 of the air conditioning apparatus 100 that maintains the environmental temperature in the control box 22 and the temperature of the electrical components at a certain level or more, and suppresses the deterioration of the electrical components and the decrease in life.

  As mentioned above, although Embodiment 1-2 was described, this invention is not limited to description of each embodiment. For example, it is also possible to combine all or part of each embodiment.

  Reference Signs List 1 outdoor unit, 2 indoor unit, 3 refrigerant main pipe, 4 refrigerant main pipe, 5 compressor, 6 outdoor heat exchanger, 7 refrigerant main pipe, 8 switching valve, 8a first port, 8b second port, 8c third port, 8d Fourth port, 9 outdoor fan, 10 indoor heat exchanger, 11 expansion device, 12 indoor fan, 21 case, 22 control box, 23a to 23d heat sink, 24a base, 24b base, 26 air path, 27a control board , 27b control board, 28a temperature sensor, 28b temperature sensor, 29 back plate, 29a peltier element, 29b peltier element, 31 electric heater, 100 air conditioner, 120a temperature sensor state, 120b temperature sensor state.

Claims (4)

And
A control box disposed in the housing and containing a control board;
A temperature sensor that detects the temperature inside the control box;
A heating device for heating the inside of the control box;
The temperature sensor is
Two are provided above and below the control box,
The heating device is
Driving is started when the temperature detected by the lower temperature sensor of the temperature sensors falls below the lower limit value of the allowable temperature of the control board mounted on the control box ,
An outdoor unit of an air conditioner wherein the driving is stopped when a temperature detected by an upper temperature sensor of the temperature sensors exceeds an upper limit value of an allowable temperature of the control board mounted on the control box . The heating device is
The outdoor unit of the air conditioning apparatus according to claim 1, wherein the outdoor unit is configured of an electric heater. The heating device is
The outdoor unit of the air conditioning apparatus according to claim 1, wherein the outdoor unit is provided below the control box. An outdoor heat exchanger that exchanges heat between outdoor air and a refrigerant;
It further comprises a fan attached to the case and supplying outdoor air to the air passage in the case,
The outdoor unit of the air conditioning apparatus according to any one of claims 1 to 3 , wherein the control box is disposed in an air path between the outdoor heat exchanger and the fan.

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