JP2004347275A - Outdoor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the reliability by preventing a temperature rise by heating of an electric control part. <P>SOLUTION: This outdoor unit has an electric control part box 9 including an inverter control part 6 for varying the rotating speed of a compressor 1 and a control board 7 for controlling an outdoor blower 3. The outdoor unit further comprises a partitioning plate 10 for partitioning a machine chamber 4 containing the compressor 1 from a blower chamber 5 containing the outdoor blower 3, the electric control part box 9 set extending over the blower chamber 5 and the machine chamber 4 and having an outside air inlet port 12 and an outside air outlet port 13, a partition 8 having an opening part, which partitions from the outside air inlet port 12 to the outside air outlet port 13 within the electric control part box 9. The inverter control part 6 is arranged on the outside air outlet port side, and the control board 7 is on the outside air inlet port side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an outdoor unit of an air conditioner including an outdoor unit and an indoor unit, and is particularly suitable for efficiently cooling an inverter control component for varying the number of rotations of a compressor and a control board for controlling an outdoor blower. is there.
[0002]
[Prior art]
Conventionally, in an outdoor unit of an air conditioner, in order to efficiently cool an inverter control component and a control board for controlling an outdoor blower, heat is exchanged between an external heat source and a refrigerant in an outdoor heat exchanger with a machine room having a compressor. And a blower room that has a blower for generating wind for the air, separated by a metal partition plate, an electric control component box containing inverter control parts and a control board is mounted on the upper part of the machine room, and an outside air outlet is provided in the metal partition plate. ing. Then, outside air is introduced into the machine room from the outside air inlet on the side of the outdoor unit by the negative pressure of the blower, and is led out to the blower room near the inverter control parts. Therefore, the control parts and the like are cooled by the outside air introduced into the machine room, and all the electric parts are equally cooled by the outside air.
[0003]
In addition, in order to cool the electrical components effectively, cut out and raise an air outlet hole that flows out a part of the air that has flowed in from the air inlet on the bottom of the electrical control component box, and pass the lower part of the board to the partition plate. It is known that the air outlet hole that guides the air flowing out of the air outlet hole to the heat exchanger room (blower room) is cut and raised, for example, as described in Patent Document 1.
[0004]
Further, in order to reduce the size of the electrical component box and to effectively cool the electrical component box, a printed circuit board having a first radiating fin exposed on one side of the electrical control component box and cooled by a blower is provided. Patent Literature 2 describes mounting a second printed circuit board having a second radiating fin that is vertically mounted so as to cover the back surface, is exposed to the back surface of the electric component box, and is cooled by a blower.
[0005]
Further, a first heat-dissipating passage in which a low heat-generating electric component having a small heat value and poor heat resistance is provided, and a second heat-dissipating passage in which a high heat-generating electric component having a large heat value and high heat resistance is provided. Patent Literature 3 discloses that a low-heat-generating electric component and a high-heat-generating electric component are separately cooled to suppress the thermal influence from the high-heat-generating electric component to the low-heat-generating electric component.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-243210 [Patent Document 2]
JP-A-11-63574 [Patent Document 3]
JP-A-9-236283
[Problems to be solved by the invention]
With recent downsizing of air conditioners, electric control parts boxes cannot be accommodated in the machine room, and have to be installed over the blower room and the upper part of the machine room. In this case, it is necessary to arrange the electric control parts in the box and take a closed structure in order to prevent rainwater from entering the electric control parts box due to rainwater being splashed by the rotation of the blower. .
[0008]
In addition, with the energy saving of the air conditioner, the electric control parts are increasingly converted to inverters that generate a larger amount of heat, the heat generated by the electric control parts alone increases, and the temperature rise of the electric control parts box tends to increase.
[0009]
In the case of Patent Document 1, the structures of the air outlet hole and the air guide hole become complicated, which causes a cost increase, and it is difficult to cope with the downsizing of the air conditioner. Further, in the case of Patent Document 2, the components are three-dimensionally arranged and two radiating fins are used, which leads to an increase in the cost of the air conditioner and complicated wiring. Further, in the case of Patent Document 3, since a separate heat exhaust passage is required, the passage structure and component arrangement are complicated.
[0010]
An object of the present invention is to make the air conditioner compact, and even when the electric control parts box is made to have a closed structure, the temperature of the air that has become high due to the heat generated by the electric control parts does not stagnate inside the electric control parts box, and the temperature rises. And to improve the reliability of the electric control parts.
[0011]
Another object is to suppress temperature rise even if the heat generation amount of the electric control component is large, and to obtain an air conditioner suitable for energy saving.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a compressor, an outdoor heat exchanger, an outdoor blower, an electric control part provided with an inverter control part for changing the rotation speed of the compressor and a control board for controlling the outdoor blower. In an outdoor unit having a box, a partition for separating a machine room in which a compressor is arranged, and a blower room in which an outdoor blower is arranged, and a straddle installed between the blower room and the machine room, an outside air inlet and an outside air An electric control component box provided with an outlet, and a partition having an opening for partitioning from the outside air inlet to the outside air outlet in the electric control component box, and having an inverter control component on the side of the outside air outlet. In addition, a control board is arranged on the outside air inlet side.
[0013]
Further, in the above, it is desirable that the area of the opening is 20 to 30% with respect to the area of the partition.
Further, in the above, it is desirable that the opening is arranged to be shifted rearward with respect to the front-rear direction of the outdoor unit.
[0014]
Furthermore, in the above, it is desirable to make the space on the outside air outlet side narrower than the outside air inlet side.
Further, in the above, it is desirable that a gap is provided above the partition.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an air conditioner according to the present invention will be described with reference to the drawings.
FIG. 1 is a unit configuration view of an outdoor unit according to one embodiment as viewed from the front. FIG. 2 is a unit configuration diagram viewed from the upper surface of the outdoor unit. FIG. 3 is an external air passage diagram in the electric control component box. FIG. 4 is a unit configuration diagram of the outdoor unit as viewed from the right side. FIG. 5 shows the shape of the partition provided in the electric control component box.
In the refrigeration cycle, a compressor 1 for compressing a gas refrigerant, an outdoor heat exchanger 2 for exchanging heat with an external heat source and a refrigerant, an indoor heat exchanger for exchanging heat with a refrigerant, and an indoor expansion valve for decompressing gas refrigerant are sequentially connected by piping. The indoor unit has a blower (not shown) for an indoor heat exchanger, and the outdoor unit has a blower 3 for an outdoor heat exchanger.
[0016]
The outdoor unit includes a machine room 4 having the compressor 1, a blower room 5 having the outdoor blower 3, an inverter control component 6 for changing the rotation speed of the compressor 1, and a control board 7 for controlling the outdoor blower 3. The inverter control component 6 and the control board 7 are partitioned by a partition 8 provided and having an opening to form an electric control component box 9. Further, in order to make the air conditioner compact, the electric control parts box 9 is installed horizontally over the machine room 4 and the blower room 5 so as to extend over the machine room 4 and the blower room 5, and the blower room 5 and the machine room 4 are made of a metal partition plate. It is divided by 10. Furthermore, since rainwater is splashed by the rotation of the blower 3, the electric control component box 9 has a closed structure in which electric control components are arranged in the box to prevent rainwater from entering.
[0017]
As a result, the temperature inside the electric control component box 9 rises, so that the outside air is introduced into the machine room 4 from the hole on the bottom of the unit and the outside air inlet of the side cover 11 by using the negative pressure of the blower 3. Further, the outside air is introduced into the electric control component box 9 through the hole 12 of the outside air introduction port provided on the bottom surface of the electric control component box 9 located at the upper part of the machine room 4, thereby suppressing the temperature rise. The outside air introduced into the electric control component box 9 passes through the control board 7, the opening of the partition 8, and the inverter control component 6, and is provided on the front side of the electric control component box 9 on the upper surface of the blower room 5. It is led to the blower room 5 from the hole 13 of the outside air outlet.
[0018]
The cooling method of the inverter control component 6 and the flow of outside air are shown in FIG. 3. By disposing the partition 8 on the side of the outside air outlet 13 and providing the partition 8 therebetween, the influence of heat transfer from the high heat generating component to the low heat generating component is suppressed.
[0019]
In addition, the opening is shifted rearward with respect to the front-rear direction of the outdoor unit, that is, by arranging the opening of the partition 8 close to the outdoor heat exchanger 2 side, the outside air outlet 13 The outside air introduced into the electric control component box 9 can be intensively applied to the inverter control component 6 arranged on the side from the opening of the partition 8. Accordingly, the wind speed can be increased around the inverter control component 6, and the inverter control component 6 having a large heat generation can be efficiently cooled.
[0020]
Further, the cooling of the inverter control component 6 is shown in FIG. 5. If the area of the opening of the partition 8 is too large, the outside air introduced into the electric control component box 9 does not have resistance, so that the wind speed around the inverter control component 6 is reduced. If it does not rise and is too small, the outside air concentrates on the opening a, and a vortex is generated and stagnates on the control board 7. In addition, by providing a gap above the partition 8 separately from the opening area, it is preferable to provide a flow path for outside air and secure a flow rate. Based on these facts, as a result of measuring the combination of the area and the gap where the wind speed can be increased most around the inverter control component 6, the opening area is 20 to 30%, preferably 25% with respect to the area of the partition 8, The gap with the upper surface of the control component box is preferably 5 to 20 mm, and more preferably 10 mm, so that the inverter control component 6 that generates a large amount of heat can be efficiently cooled.
[0021]
Further, the electric control component box 9 is partitioned by the partition 8 into the outside air inlet 12 side of the control board 7 and the outside air outlet 13 side of the inverter control component 6, and a space closer to the outside air outlet 13 than the outside air inlet 12 is. Is narrowed. Accordingly, the outside air introduced into the space on the side of the outside air outlet 13 from the opening of the partition 8 has a smaller space area on the side of the outside air outlet 13 than on the side of the outside air inlet 12, so that the space on the side of the outside air outlet 13 is small. And the inverter control component 6 having a large amount of heat generated and disposed in the space on the side of the outside air outlet 13 can be efficiently cooled.
[0022]
As described above, by dividing the control board having a small amount of heat into the outside air introduction port and the inverter control component having a large amount of heat by the outside air outlet by the partition having the opening, heat from the high heat generation component to the low heat generation component can be reduced. The influence can be suppressed, and the partition reduces the flow area of the outside air introduced into the electric control component box, intensively applies the inverter control component from the partition opening, and raises the wind speed around the inverter control component, The cooling efficiency of the inverter control component that generates a large amount of heat can be improved. Therefore, it is possible to prevent the operating range of the air conditioner from being narrowed by protecting the temperature rise of the electric control components, and to improve the reliability of the electric control components.
[0023]
In addition, the inside of the electric control parts box is divided into an inverter control part having a large amount of heat generation and a control board having a small heat generation amount, and the ratio of the space is 30% or less for the inverter control parts side and 70% for the control board side. By reducing the space on the inverter control component side as described above, the wind speed around the inverter control component can be increased, and in particular, the cooling efficiency of the inverter control component can be improved.
[0024]
【The invention's effect】
As described above, according to the present invention, suitable for downsizing of an air conditioner, and even when the electric control component box has a sealed structure, the high-temperature air stagnates inside the electric control component box due to the heat generated by the electric control components. Without increasing the temperature, the reliability of the electric control component can be improved. Further, even if the amount of heat generated by the electric control component is large, the temperature rise can be suppressed, and the operating range can be expanded to be suitable for energy saving of the air conditioner.
[Brief description of the drawings]
FIG. 1 is a front view of an outdoor unit according to an embodiment.
FIG. 2 is a plan view as viewed from the upper surface of FIG. 1;
FIG. 3 is an explanatory diagram of an outside air passage in the electric control component box according to the embodiment;
FIG. 4 is a right side view of the outdoor unit according to the embodiment.
FIG. 5 is a side view showing the shape of the partition according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Outdoor heat exchanger, 3 ... Blower, 4 ... Machine room, 5 ... Blower room, 6 ... Inverter control parts, 7 ... Control board, 8 ... Partition, 9 ... Electrical control parts box, 10 ... Partition plate, 11: side cover, 12: outside air inlet, 13: outside air outlet.

Claims (5)

In an outdoor unit having a compressor, an outdoor heat exchanger, an outdoor blower, and an electric control parts box provided with an inverter control component for varying the rotation speed of the compressor and a control board for controlling the outdoor blower,
A machine plate in which the compressor is arranged, and a blower room in which the outdoor blower is arranged, and a partition plate for partitioning,
The electric control component box, which is installed over the blower room and the upper part of the machine room, and provided with an outside air inlet and an outside air outlet.
Partitioning between the outside air inlet and the outside air outlet in the electric control component box, a partition having an opening,
Wherein the inverter control component is arranged on the outside air outlet side and the control board is arranged on the outside air inlet side. 2. The outdoor unit according to claim 1, wherein the area of the opening is 20 to 30% of the area of the partition. The outdoor unit according to claim 1, wherein the opening is displaced rearward with respect to a front-rear direction of the outdoor unit. 2. The outdoor unit according to claim 1, wherein a space on the outside air outlet side is smaller than that on the outside air inlet side. 2. The outdoor unit according to claim 1, wherein a gap is provided above the partition.

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