JPH04120577U - air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the cooling capacity of power transistors. With conventional cooling that relies only on atmospheric heat radiation, it is impossible to cool when the fan is stopped, and with cooling methods that use refrigerant piping, the cooling efficiency changes significantly during cooling and heating, resulting in excess and deficiency in cooling capacity. [Structure] The cooling capacity is stabilized by using both cooling by atmospheric heat radiation from the radiation fins 13 and cooling by heat conduction radiation from the radiation fins 13 to the liquid pipe 9a.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to air conditioners, especially heat generating elements such as power transistors. The present invention relates to an air conditioner that can cool air with stable performance.

0002

[Conventional technology]

Conventionally, power transistors in air conditioners are cooled using multiple heat dissipation fins. The power transistor is attached to a heat sink with a This is done by placing it on the road.

0003 However, with the above method, the outdoor fan is turned off during dry operation or when a headwind occurs. When the engine is stopped, sufficient cooling effect cannot be obtained, so for example, during actual operation. In Publication No. 61-133775, the refrigerant between the indoor heat exchanger and the pressure reduction mechanism A structure has been proposed in which a heat sink is brought into direct contact with the piping and the power transistor is cooled with a refrigerant. It is being proposed.

0004

[Problem that the idea aims to solve]

However, the above structure has the following drawbacks. It is the above refrigerant piping. Because the temperature fluctuates greatly between cooling and heating operations, insufficient cooling may occur. Or, stable cooling performance such as dew condensation due to excessive cooling. This means that it is difficult to obtain the ability. Moreover, the refrigerant between the indoor heat exchanger and the pressure reduction mechanism During cooling operation in the humid summer months, piping can reach a temperature considerably lower than the atmospheric dew point. Therefore, structures with heat sinks attached to this area are particularly prone to condensation. There are some drawbacks.

[0005] This invention was made to solve the above-mentioned conventional drawbacks, and The purpose is to cool heat generating elements such as power transistors with stable performance. Our goal is to provide air conditioners.

[0006] Therefore, in the air conditioner of claim 1, the heat sink 11 includes a plurality of heat sink fins 13. , a heat generating element 12 such as a power transistor is installed, while an indoor heat exchanger 7 and an outdoor heat exchanger 7 are installed. The heat radiation fins 13 are connected to the liquid pipe 9 between the heat exchanger 8 or the suction pipe 3 of the compressor 1. The feature is that some parts are connected for heat exchange.

[0007] Further, in the air conditioner according to claim 2, the radiation fins 13 are connected to the outdoor heat exchanger 8 and to the depressurized air conditioner. It is characterized in that it is connected to a liquid pipe 9a between it and the mechanism 10.

[0008]

[Effect]

In the air conditioner according to claim 1, the heating element 12 is cooled from the radiation fins 13. by heat radiation to the atmosphere and heat conduction from the radiation fins 13 to the liquid pipe 9 or the suction pipe 3. This is done through heat dissipation. Therefore, the temperature of the liquid pipe 9 or the suction pipe 3 is high, and the heat transfer Even if the cooling by conduction is not sufficient, the cooling due to heat radiation from the radiation fins 13 to the atmosphere Cooling takes place. Also, if the temperature of the liquid pipe 9 or suction pipe 3 is extremely low, , since the other heat dissipating fins 13 radiate cold heat to the atmosphere, the heating element 12 itself is never overcooled.

[0009] Furthermore, the air conditioner of claim 2 has a cooling capacity during cooling operation in summer. Nono is cooled by a liquid pipe 9a maintained at a temperature higher than the atmospheric dew point temperature. Therefore, the occurrence of dew condensation can be reliably prevented.

0010 In FIG. 1, 1 is a compressor, and its discharge pipe 2 and suction pipe 3 are four-way. It is connected to a pair of ports of the switching valve 4. Also, the other pair of the four-way switching valve 4 A first gas pipe 5 and a second gas pipe 6 are connected to the port, and the first gas pipe 5 is The second gas pipe 6 is connected to the indoor heat exchanger 7, and the second gas pipe 6 is connected to the outdoor heat exchanger 8. Ru. The indoor heat exchanger 7 and outdoor heat exchanger 8 are connected by a liquid pipe 9. In addition, a capillary tube 10 as a pressure reducing mechanism is interposed in the liquid pipe 9. Ru. Then, between the outdoor heat exchanger 8 and the capillary tube 10, the liquid The middle part of the tube 9 is bent into a U-shape, and a heat sink 11 is attached to this part 9a. Ru.

[0011] As shown in FIG. 2, this heat sink 11 has a power transistor (heat generating element) 12 is attached, and a plurality of heat dissipation fins 13... are mounted on the other side. We are prepared. And the tip of the pair of radiation fins 13, 13 among the radiation fins 13 Attachments 14, 14 for attaching the heat sink 11 to the liquid pipe 9a are provided at the end. installed.

0012 As shown in FIG. 3, this attachment 14 is composed of a pair of members 15 and 16. The tip of the heat dissipation fin 13 is fitted onto the outer periphery of one member 15. In addition to forming a fitting groove 17 in which the heat dissipating fin 13 is inserted, the tip of the radiation fin 13 is formed in this portion At the same time as fixing with brazing, both members 15 and 16 sandwich the liquid pipe 9a from its periphery. In this state, it is fixed with screws (not shown) or the like. In other words, this a The heat radiation fin 13 and the liquid pipe 9a are thermally connected by the attachment 14. There is.

[0013] Although not shown, the heat sink 11 is installed indoors in the electrical component box of the outdoor unit. It shall be placed in a ventilation path provided by the outside fan 18 (FIG. 1).

[0014] In the above air conditioner, the power transistor 12 is cooled by the heat radiation fin 1. 3 to the atmosphere and liquid from the heat radiation fin 13 via the attachment 14. This is done by heat radiation by heat conduction to the tube 9a. Therefore, the temperature of the liquid pipe 9a is high. Even if cooling by heat conduction is not sufficient, heat can be radiated from the radiation fins 13 to the atmosphere. Cooling is performed by Also, if the temperature of the liquid pipe 9a is extremely low, other Since the heat dissipation fins 13 release cold heat to the atmosphere, that is, absorb heat, the power This prevents the register 12 from being excessively cooled down to the temperature of the liquid pipe 9a. Therefore, the power transistor 12 can be cooled with stable cooling capacity. It becomes.

[0015] Further, the U-shaped liquid pipe 9a has a certain cooling capacity during cooling operation in summer. However, since the temperature is maintained much higher than the atmospheric dew point temperature, Even if the heat sink 11 is attached, problems such as dew condensation will not occur.

[0016] An embodiment of the air conditioner of this invention has been explained above, but for example, the attachment Implementation with various changes, such as changing the structure of point 14 or omitting its use. It is possible to do so. In addition, although the heat sink 11 is connected to the liquid pipe 9a in the above, The heat sink 11 can also be connected to the suction pipe 3 of the compressor 1.

[0017]

[Effect of the idea]

As described above, in the air conditioner of claim 1, heat radiation from the radiation fins to the atmosphere; Is the heating element cooled by both heat conduction from the radiation fins to the liquid tube? Therefore, excess or deficiency in cooling capacity is less likely to occur, and therefore the heating element can be cooled in a stable state. is obtained.

[0018] Further, in the air conditioner of claim 2, even during cooling operation in summer, the atmospheric dew point temperature Since liquid pipes that are maintained at a temperature above the above level are used for cooling, there is a problem of condensation occurring. can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram showing an embodiment of an air conditioner of this invention.

FIG. 2 is an explanatory diagram of an example of a state in which a heat sink is attached to a liquid pipe in the air conditioner.

FIG. 3 is a front view of the attachment used in the above.

[Explanation of symbols]

1 Compressor 3 Suction piping 7 Indoor heat exchanger 8 Outdoor heat exchanger 9 Liquid pipe 9a Liquid pipe 11 Heat sink 12 Power transistor (heating element) 13 Heat dissipation fin

Claims (2)

[Scope of utility model registration request] Claim 1: A heat sink (11) equipped with a plurality of heat sinks (13) is provided with a heat generating element (1) such as a power transistor.
2), while installing the heat radiation fins (13) on the liquid pipe (9) between the indoor heat exchanger (7) and the outdoor heat exchanger (8) or the suction pipe (3) of the compressor (1) ) are connected for heat exchange. 2. The air conditioning system according to claim 1, wherein the radiation fins (13) are connected to a liquid pipe (9a) between the outdoor heat exchanger (8) and the pressure reduction mechanism (10). harmonizer.