JPH01208626A - Air conditioner - Google Patents

Abstract

PURPOSE:To enhance a water proof capacity of an electric equipment part and enable more compact design, by fixing a power transistor to the end of a heat pipe installed inside electrical equipment part and leading the other end of said heat pipe outside the electrical equipment part, penetrating through the side wall, and installing a cooling device based on heat dissipating plates. CONSTITUTION:An outdoor equipment body 11 of a heat pump type-air conditioner is provided with a heat exchanger 12, a blower 13, a compressor 14, and an electrical equipment part 15 inside, and divided into a heat exchanger chamber 12', a compressor chamber 14' by a partition plate 30. The electric equipment part 15 is covered with a box-shaped member 16 formed above the compressor 14, and is provided with a print substrate 18, a power transistor 19, a cooling device 20, etc. The power transistor 19 is fixed to a metal fitting 23 having a good heat conductivity fastened to a hole on one side of a heat pipe 26. The heat pipe 26 passes through a penetration hole 22 in the central part of a side wall 25 of the box member 16 and makes the other end of the heat pipe to face outside the electric equipment part 15, thereby fixedly installing the heat dissipating plate 28 which forms a heat sink to the end. The penetration hole 22 and its surrounding areas are sealed with a silicon sealing member 27 and the like. The heat generated by the power transistor 19 is transferred to the heat dissipating plate 28 of the heat sink by the convection of heat inside the heat pipe 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooling device for power transistors used in air conditioners.

Conventional technology Conventionally, a cooling device for a power transistor in an electrical component of an outdoor unit of a separate air conditioner, that is, a cooling device for a power transistor in an inverter type air conditioner, had a configuration as shown in Fig. 3. . A side wall 3 of a box 2 of an electrical equipment section 1 is provided, an opening 4 is provided by opening a part of this side wall 3, and a heat sink 6 is fixed to this opening 4. This heat sink 6 is provided with fins e that protrude toward the blower side A (not shown) to increase the heat dissipation area, and a power transistor 8 that generates a large amount of heat is fixed to the flat part 7 on the opposite side. ing. In this way, conventionally, by operating the blower on the blower side A, an air flow is generated near the fins 6, the heat generated from the power transistor 8 is transferred to the heat sink 5, and the heat transferred to the fins 6 is transferred to the heat sink 5. The power transistor 8 was cooled by dissipating heat through the air flow.

Problems to be Solved by the Invention In such a conventional configuration, the opening in the side wall is made large according to the external shape of the heat sink 6, and the gap between the inside of the opening 4 and the outer periphery of the heat sink 5 is reduced. There was a problem in that sealing was difficult and water droplets and dust from the outside of the electrical component, that is, from the blower side A, inevitably entered the interior of the electrical component. In addition, since the dimensions of the flat part 7 of the heat sink 5 are relatively large, when designing the electrical component part 1, an opening 4 forming the outer periphery of the flat part 7 is included in the design in order to secure space for mounting the heat sink 6. The problem was that it became a major constraint on the above.

The present invention solves these problems by making the opening smaller to prevent water and dust from entering from outside the electrical component, and also eliminates the need to consider the space for the heat sink in the electrical component, making it more compact. The purpose is to provide a box for the electrical equipment section.

Means for Solving the Problem In order to solve this problem, the present invention divides a heat exchanger room and a compressor room by a partition plate, provides a box body having an electrical component on the partition plate, and A heat pipe is provided in a side wall of the box body with a through hole passing through the heat exchanger chamber and the box body of the electrical equipment section, and a power transistor or the like is attached to one side of the box body of the heat pipe via a metal fitting. However, the other side is equipped with a cooling device equipped with a heat sink that forms a heat sink on the side of the heat exchanger chamber.

Effect With this configuration, the heat generated by the power transistor fixed to the box side of the heat pipe is transferred via the metal fittings to the heat sink fixed to the other end of the heat pipe, and the heat sink is transferred to the blower by the heat sink. The power transistor is cooled by heat dissipated into the air due to the operation.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 2, a heat exchanger 12, a blower 13, a compressor 14, and an electrical unit 16 are included as main parts in the main body 11 of the outdoor unit of the heat pump air conditioner equipped with a separate inverter. As shown in the figure, a heat exchanger chamber 12' and a compressor chamber 14' having a compressor 14 are defined by the partition plate 3o. The electrical equipment section 16 is covered by a box 16 formed above the compressor 14 and is provided in a space above the compressor 14.

The electrical equipment section 16 also includes a printed circuit board 18, a power transistor 19 that generates a lot of heat, and a power transistor 19 that generates a lot of heat.
It has 9 cooling devices 20, etc.

Next, the details of the cooling device 2o will be explained with reference to FIG. The power transistor 19 is fixed to a metal fitting 23 having good thermal conductivity, and this metal fitting 23 is fixed to a hole provided in one side of the heat pipe 26.

The heat pipe 26 is provided with a through hole 22 that passes through the center of the side wall 26 of the box body 16, and the inside of the periphery of the through hole 22 of the box body 16 is sealed with a silicon-based sealant 27 or the like. There is. The other end of the heat pipe 26 is made to face the outside of the electrical equipment section 15, and a heat sink 28 forming a heat sink is fixed to the heat pipe 26. That is, the heat dissipation plate 28 is firmly fitted to the heat pipe 26 at the center, and has a fin portion 20 formed in an uneven shape.
a and the fitting part 2ob are different.

In the above configuration, the heat generated by the power transistor 19 is transferred to the heat pipe 26 via the metal fitting 23,
The heat is transferred by thermal convection within the heat pipe 26 to a heat sink plate 28 of a heat sink fixed to the other end of the heat pipe 28. The heat of the heat sink 28 is radiated to the surrounding air by the operation of the blower 13 by the fin portion 20a provided on the heat sink 28, and the heat is radiated to the surrounding air by the operation of the blower 13.
is cooled.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention,
Using a heat pipe, the power transistor is fixed to the end K of the heat pipe located inside the electrical equipment section, and the other end is placed outside the electrical equipment part by penetrating the side wall of the electrical equipment part, and a cooling device using a heat sink is provided. By making the through holes in the box smaller, the watertightness of the electrical component can be improved, preventing water droplets and dust from entering from outside the electrical component, and eliminating the need for the heat sink, which serves as a heat sink, inside the electrical component. Since it can be installed outside the electrical equipment section, the box body can be designed to be smaller and more compact, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a detailed cross-sectional view showing an air conditioner-like cooling device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the configuration of an air conditioner according to the present invention, and FIG. FIG. 3 is a cross-sectional view showing a partial configuration. 12'... Heat exchanger room, 14'... Compressor room, 16... Electrical equipment section, 16... Box body, 19... ...Power transistor, 20...
... Cooling device, 20 a ... Heat sink, 22.
...Through hole, 23...Metal fitting, 26...
...Side wall, 26...Heat pipe, 30...
...Partition board. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 σ --- ditobaia

Claims (1)

[Claims] A heat exchanger room and a compressor room are partitioned by a partition plate,
A box body having an electrical equipment section is provided on the partition plate, a through hole is provided in a side wall of the box body through which a heat pipe passes through the heat exchanger chamber and the box body of the electrical equipment part, and one side of the heat pipe is provided. An air conditioner comprising a cooling device in which a power transistor, etc. is mounted on the box side via metal fittings, and a heat sink forming a heat sink is mounted on the other side on the heat exchanger room side.