JPH06331180A - Outdoor unit for air conditioner - Google Patents

Abstract

PURPOSE:To sufficiently cool a control unit required to be cooled such as power transistor, etc., of an inverter and to reduce in size its housing. CONSTITUTION:An inverter-driven compressor 24 and a control board 33 at its front panel 20d side are installed in a machine room 22 formed under a partition plate 21 for partitioning a housing 20. A U-shaped heat exchanger 26 is so installed as to be opposed to air intake ports 28a, 28b, 28c formed at a back surface 20a, and both left and right sides 20b, 20c are installed in a heat exchanger room 23 formed above the plate 21, and a fan 27 is so installed as to be opposed to an exhaust port 29 formed at the panel 20d. A radiating fin 34 of a controller 32 required to be cooled such as a power transistor, etc., of an inverter is arranged at one side of the port 29 at the panel 20d in the room 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit for an air conditioner.

[0002]

2. Description of the Related Art An example of an outdoor unit of a conventional air conditioner is shown in FIG. The inside of the cabinet 1 of the outdoor unit is partitioned into left and right by a partition plate 2, and the machine room 3 is provided on one side thereof.
However, the heat exchanger chamber 4 is formed on the other side.

In the machine room 3, an inverter-driven compressor 5 and a control box 6 are arranged above it. A heat radiating fin 7 of a control device that requires cooling, such as a power transistor of an inverter housed in the control box 6, is projected into the heat exchanger chamber 4.

In the heat exchanger chamber 4, an L-shaped heat exchanger 9,
A blower fan 10 and the like are provided, and the L-shaped heat exchanger 9 is opposed to an air intake 11 formed on the back surface 1a of the housing 1 and an air intake 12 formed on the left side surface 1b. Further, the blower fan 10 is installed so as to face an exhaust port 13 formed in the front panel 1c of the housing 1. In addition, 14 is a motor for driving the blower fan 10, and 15 is an installation leg attached to the lower surface of the bottom plate 1d of the housing 1.

When the blower fan 10 is rotationally driven by the motor 14, outside air is sucked into the heat exchanger chamber 4 through the air intakes 11 and 12, and heat is exchanged with the refrigerant in the process of passing through the heat exchanger 9. After the temperature is raised or lowered, the air is blown by the blower fan 10 and discharged from the exhaust port 13.

At the same time, the air flowing through the right end of the heat exchanger 9 flows between the heat radiating fins 7 to cool the control devices such as the power transistors of the inverter which require cooling.

[0007]

When the heat exchanger chamber 4 and the machine chamber 3 are vertically stacked in order to downsize the conventional outdoor unit and reduce the installation area thereof, the air generated by the blower fan 10 is generated. There is a problem that a control device that requires cooling, such as a power transistor of an inverter, cannot be sufficiently cooled depending on the current. In addition, control box 6
Since it occupies a considerably large space, there is a problem in that it is difficult to accommodate the control box in the machine room 4.

An object of the present invention is to sufficiently cool a control device that requires cooling, such as a power transistor of an inverter. Another object is to downsize the machine room and the heat exchanger room, and thus downsize the device housing. Further, another purpose is to prevent rain from falling on the heat radiation fins of the control equipment that requires cooling, and from preventing the drain dropped from the heat exchanger from falling.

[0009]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and its gist is to provide a machine room formed under a partition plate for partitioning the inside of a casing. An inverter-driven compressor and a control panel on the front panel side of the compressor are installed in the heat exchanger chamber formed at the top of the partition plate so that it faces at least the air intake formed on the back side of the U-shaped heat exchanger. The ventilation fan is installed so as to face the exhaust port formed on the front panel, and the heat dissipation fin of the control equipment that requires cooling such as the power transistor of the inverter is installed on one side of the exhaust port on the front panel side. The outdoor unit of the air conditioner, which is characterized in that

The radiating fins may be arranged in the air flow path which flows in through the end portion where the number of rows of the heat exchanger is reduced and a step is formed.

[0011]

In the present invention, since it has the above-mentioned structure, it is sucked into the heat exchanger chamber from the air inlet formed on the side surface of the heat exchanger chamber by the blower fan and flows through the end portion of the heat exchanger. A part of the air is passed between the heat radiation fins of the control device requiring cooling to cool it.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIG. The inside of the device casing 20 is vertically divided by a partition plate 21,
A machine room 22 is formed below the partition plate 21, and a heat exchanger room 23 is formed above the partition plate 21.

A U-shaped heat exchanger 26 is disposed in the heat exchanger chamber 23. The heat exchanger 26 is a fin tube type heat exchange element 26a consisting of a row of heat transfer tubes and a number of plate fins.
These heat exchange elements 26a are formed by stacking two 26b on top of each other.
, 16b are connected at the right end by a side plate 26c, and the left end has a small number of rows to form a step. The U-shaped heat exchanger 26 is opposed to the air inlets 28a, 28b, 28c provided on the rear surface 20a, the left side surface 20b, and the right side surface 20c of the housing 20. The blower 27 is installed in the heat exchanger chamber 23 so as to face the exhaust port 29 provided in the front panel 20d.

On the other hand, a horizontal compressor 24 and the like are arranged in the machine room 22. As shown in FIG. 1 (A), an L-shaped control box 31 is disposed across the machine room 22 and the heat exchanger room 23, and the L-shaped control box 31 is provided.
The horizontal part 31a is installed on the front panel 20d side of the compressor 24 in the machine room 22, and the control panel 33 and the like are housed in the horizontal part 31a.

The rising portion 31b of the L-shaped control box 31 extends into the heat exchanger chamber 23 and is arranged on one side of the exhaust port 29, that is, on the left side on the front panel 20d side, and inside this rising portion 31b. A control device 32 that requires cooling, such as a power transistor of an inverter, is housed. The heat dissipation fins 34 of these control devices 32 are arranged in the air flow path that flows in through the portion where the number of rows of the heat exchanger 26 is reduced and a step is formed. On the other side of the exhaust port 29 on the front panel 20d side, that is, on the right side, a refrigerant manifold, throttle, branch pipe and the like 35 are arranged.

However, when the blower 27 is driven, the outside air is sucked into the heat exchanger chamber 23 through the air intake ports 28a, 28b, 28c and flows through the U-shaped heat exchanger 26, so that the refrigerant and the heat are removed. After the temperature is raised or lowered by the exchange, the air is blown by the blower 27 and discharged from the exhaust port 29 to the outside. At this time, the air that has flowed through the stepped portion at the left end of the heat exchanger 26 is cooled by flowing between the radiating fins 34, and is then sucked into the blower fan 27.

Thus, the control device 32 requiring cooling can be sufficiently cooled by the main flow of the air that flows through the heat exchanger 26 and is sucked into the blower 27.

Further, since the control device 32 requiring cooling is installed in the heat exchanger room 23 and the control panel 33 is installed in the machine room 22, the machine room 22 can be downsized.

Since the heat radiation fins 34 of the control device 32 requiring cooling are arranged on one side of the exhaust port 29 on the front panel 20d side in the heat exchanger chamber 23, the rain that has entered from the exhaust port 29 is absorbed by the heat radiation fins 34. Also, the drain dropped from the heat exchanger 26 during the cooling operation is not sprinkled on the heat dissipation fin 34.

[0020]

According to the present invention, the radiating fins of the control equipment that requires cooling, such as the power transistors of the inverter, are arranged on one side of the exhaust port on the front panel side in the heat exchanger chamber, so that the heat exchanger chamber is driven by the blower fan. It is possible to sufficiently cool the control device that requires cooling by the air that has been sucked into the air and has passed through the heat exchanger.

Further, since the control equipment requiring cooling is installed in the heat exchanger room and the control panel is installed in the machine room, the machine room can be downsized, which contributes to downsizing of the equipment housing. You can

Further, since the radiating fin of the control device requiring cooling is disposed on one side of the exhaust port on the front panel side, rain entering through the exhaust port and drain dropped from the heat exchanger during cooling operation are radiating fins. Can be prevented from being sprinkled on.

[Brief description of drawings]

FIG. 1 is a schematic view of an outdoor unit of an air conditioner according to an embodiment of the present invention, (A) is a front view, (B) is a side view, and (C) is a top view.

FIG. 2 is a schematic view of an outdoor unit of a conventional air conditioner, where (A) is a front view, (B) is a side view, and (C) is a top view.

[Explanation of symbols]

 20 Cabinet 20a Rear 20b Left side 20c Right side 20d Front panel 21 Partition plate 22 Machine room 23 Heat exchanger room 24 Compressor 31 Control box 33 Control panel 26 Heat exchangers 28a, 28b, 28c Air intake 29 Exhaust port 27 Blower fan 32 Control device 34 Radiating fin

Continued Front Page (72) Inventor Masami Ito 3-1, Asahimachi, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (2)

[Claims] 1. A heat exchanger formed on an upper part of the partition plate, wherein an inverter-driven compressor and a control panel are installed on a front panel side of the compressor in a machine room formed on a lower part of the partition plate for partitioning the inside of the casing. A U-shaped heat exchanger is installed in the room so as to face at least the air intake formed on the back surface thereof, and a blower fan is installed so as to face the exhaust opening formed on the front panel, and the power of the inverter is set. An outdoor unit for an air conditioner, characterized in that a radiation fin of a control device requiring cooling of a transistor or the like is arranged on one side of the exhaust port on the front panel side. 2. The air conditioner according to claim 1, wherein the heat radiation fins are arranged in an air flow path which flows in through an end portion where the number of rows of the heat exchanger is reduced and a step is formed. Outdoor unit of the machine.