JPH0486435A - Heat exchanging device - Google Patents

Abstract

PURPOSE:To prevent a temperature of each of electrical parts in an electrical box from being abnormally increased by a method wherein an aeration port for sucking surrounding air under an operation of blower is provided, and electrical parts having lower heat resistant temperature are disposed at upstream side of electrical parts having higher heat resistant temperatures. CONSTITUTION:An electrical box 10 is constructed by both side plates 10a, 10b, a back plate 10c, an upper plate 10d and a lower plate 10e. One side plate 10a of the electrical box 10 is provided with a suction port 15a acting as an aeration port and a discharging port 15b acting as an aeration port for flowing in or flowing out the surrounding air into the electrical box 10 under operation of a blower 9, and further provided with a through-pass hole 16 for loading or unloading a lead wire of an electrical component 8. A partition plate 18 is placed in such a way as thermal radiation fins 17 of a power transistor 4 are adjacent to the discharging port 15b. A movable plate 21 of which one end is pivotally supported by a hinge 19 and the other end is fixed by screws 20 is provided. With such an arrangement, since the electrical parts having a low heat resistant temperature are not influenced by other electrical parts having a high heat resistant temperature, but cooled, so it is possible to improve the durability of the electrical parts.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heat exchange unit used as an outdoor unit of a split type air conditioner.

<Prior Art> Conventionally known outdoor units of split type air conditioners include an air-cooled type with a built-in air-cooled heat exchanger as described in Japanese Utility Model Publication No. 52-9772, and a water-cooled type. There is a water-cooled type with a built-in heat exchanger, and air-cooled outdoor units have a blower to forcefully cool the air-cooled heat exchanger with outside air. It is introduced into the electrical equipment box to cool the electrical components inside the electrical equipment box.

<Problem to be solved by the invention> However, unlike air-cooled types, water-cooled outdoor units do not have a blower for the heat exchanger, so the electrical components inside the electrical box are not forcibly cooled with outside air, resulting in abnormal temperatures. There was a risk that it would rise.

In view of the above-mentioned circumstances, the present invention aims to provide a heat exchange unit that configures a flow of outside air within an electrical equipment box and solves the above-mentioned problems.

Means for Solving the Problems> The present invention includes a compressor, electrical parts with different heat resistance temperatures, and an electrical box containing a blower, and the electrical box has a vent through which outside air is taken in and discharged by the blower. Electrical components with lower heat-resistant temperatures are placed upwind of electrical components with higher heat-resistant temperatures.

Due to the above-mentioned configuration, the outside air sucked into the electrical box cools down the electrical components with low heat resistance first, and this cooling action causes the increased temperature of the outside air to cool down the electrical components with high heat resistance. Ru. In this way, electrical components with lower heat-resistant temperatures are cooled without being affected by the heat of electrical components with higher heat-resistant temperatures.
Improves durability.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

1 is a compressor 2 whose operating frequency can be changed using an inverter, a water-cooled heat exchanger 3, and a power transistor 4 for the inverter.
．． Terminal board 5. This is a sealed heat exchange unit main body in which an electrical box 10 containing electrical parts 8 such as a relay 6 and a control board 7 and a blower 9 is arranged. In this case, the electrical equipment box 10 includes both side plates 10a, 1. Ob, back plate 10C and upper plate 10d
and a lower plate 10e. A service panel 14 of an electrical equipment box]O, which also serves as a front panel of the unit main body 1, is provided on the side surface. In addition, an intake port 15a and a ventilation port 15b are provided on one side plate 10a of the electrical equipment box 10, and the lead wires of the electrical components 8 are introduced. A through hole 16 is provided to lead out, and a partition plate 18 is provided so that the heat dissipation fin 17 of the power transistor 4 faces the exhaust port 15b side.
8 is provided with a movable plate 21 whose one end is pivotally supported by a hinge 1 and whose other end is fitted into I with a screw 20.

In the figure, 22 is a liquid receiver disposed in the inner space of the water-cooled heat exchanger 3, 23 is a gas-liquid separator, 24 is an oil separator, and 25 is a refrigerant pipe.

Further, 26a and 26b are service valves disposed in the unit main body 1 provided at the inlet and outlet ends of the refrigerant pipe 25, and 27a and 27b are service valves of the cooling water pipes 28a and 28b connected to the water-cooled heat exchanger 3. The connection port 29 is a drain port.

Next, this operation will be explained. First, when the compressor 2 is driven to start a predetermined cooling or heating operation, the blower 9 is rotated at the same time.

Here, since the blower 9 faces the intake port 15a located above the electrical box 10, outside air A in the ceiling space flows into the electrical box 10 from the intake port 15a, and the front surface of the movable plate 21 on the near side Terminal board attached to 5. The direction flows down to the control board 7, and also flows into the frame formed on the back of the movable plate 21, and the relay 6 attached to the back of the movable plate 2] and the power supply attached to the front of the partition plate 8 It flows into the transistor 4, rises from the bottom of the electrical equipment box 1 through the lower end 33 of the partition plate 18, cools the radiation fins 17, and is then discharged from the exhaust port 15b (see the dotted line arrow in FIG. 3). That is, the outside air flowing into the electrical equipment box 10 is transferred to the movable plate 2.
1, the outside airflow is distributed in the front and back direction, and one outside airflow 10aJ flows through the control board 7 with a low thermal temperature to the terminal board 5, which has a high heat-resistant temperature, and the other outside airflow flows through the power transistor 4, which has a low heat-resistant temperature, with a red color. Since the heat flows to the relay 6, which has a high temperature, the control board 7 and the power transistor 4, which have a low heat resistance temperature, are cooled without being affected by the heat from the terminal board 5 and the relay 6, which have a high heat resistance temperature, thereby improving durability. Note that the terminal board 5 is cooled by the outside air whose temperature has increased 17 due to the cooling of the control board 7, and the relay 6 is cooled by the outside air whose temperature has increased due to the cooling of the power transistor 4, but since both have high heat resistance temperatures, there is no problem. do not have.

For example, the control board 7 has a heat-resistant temperature of 60°C.
℃, power transistor 4 is 29℃.

The temperature of the terminal plate 5 is 120°C, and the temperature of the relay 6 is 120°C.

In addition, during service inspection of electrical components 8, if the terminal board 5 or control board 7 has a service panel] 4 removed, the front opening of the electrical box 10 is opened, so that the service inspection can be carried out at the front of the unit body l. Service inspection of the relay 6 and power transistor 5 can be performed more easily by removing the screw 20 and then rotating the movable plate 21 in the direction of the arrow shown in FIG. This can be easily done from the front of the unit body 1.

<Effects of the Invention> As described above, according to the present invention, electrical components with low heat resistance temperature (control board, etc.) are installed in the electrical equipment box.

Since the power transistors are placed upwind of electrical components (terminal boards, relays) with higher heat-resistant temperatures, electrical components with lower heat-resistant temperatures are cooled without being affected by electrical components with higher heat-resistant temperatures, increasing durability. can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view showing the inside of the heat exchange unit, FIG. 2 is a front view showing the inside of the heat exchange unit, and FIG. 3 is a side view of the heat exchange unit. It is. 1... Heat exchange unit body, 2... Compressor, 3...
・Water-cooled heat exchanger, 4...Power transistor ・51
1. Terminal board, 6...Relay, 7...Control board 18...Electrical components, 9...Blower, 10...Electrical box, 15a...Intake port, 15b...Exhaust port. Patent applicant: Sanyo Electric Co., Ltd. Agent
Figure 1 Figure 2

Claims (1)

[Claims] 1. Equipped with a compressor, electrical components with different heat-resistant temperatures, and an electrical box with a built-in blower, and the electrical box has a vent through which outside air is taken in and discharged by the blower, so that electrical components with lower heat-resistant temperatures can be heated to lower temperatures. A heat exchange unit characterized by being placed on the windward side of electrical components with high temperatures.