JPH09236283A - Outdoor unit for air conditioner - Google Patents

Abstract

(57) [Abstract] [Problem] By arranging a low-heat-generating electric component and a high-heat-generating electrical component in different exhaust heat passages, it is possible to suppress thermal influence from the high-heat-generating electrical component to the low-heat-generating electrical component as much as possible. To be able to do. SOLUTION: In an outdoor unit for an air conditioner, a heat exchange chamber 2 and a component storage chamber 3 are defined by a partition plate 11 in a casing 1, and a switch box 12 is attached to the partition plate 11. The switch box 12
In addition, a low heat generation electric component 2 which has a small amount of heat generation and inferior heat resistance
7 is provided, and a second exhaust heat passage 36 in which a high heat-generating electrical component 31 that has a large amount of heat generation and high heat resistance is disposed is provided, and a low heat-generating electrical component 27 is provided. The high heat generating electric component 31 is cooled separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner outdoor unit, and more particularly to a cooling structure for a switch box in the air conditioner outdoor unit.

[0002]

2. Description of the Related Art Generally, in a casing of an outdoor unit for an air conditioner, a heat exchange chamber for arranging a heat exchanger and a fan that does not interfere with water and various electrical parts that interfere with water when exposed to water. Are partitioned by a partition member that extends in the front-rear direction of the casing (see, for example, Japanese Utility Model Laid-Open No. 1-116331), and the electrical components and the like are housed in a box called a switch box. It was stored.

[0003]

By the way, various electric parts are arranged in the switch box. These electric parts have high heat generation but have high heat resistance (for example, reactor etc.). ) And low-heat-generating electrical components (such as control boards) that generate a small amount of heat but are inferior in heat resistance. If these components are mixed and arranged, thermal effects from electrical components that generate a large amount of heat (such as convective heat, Effect of radiant heat, etc.)
The electrical parts having poor heat resistance are subjected to the heat treatment, which may impair the reliability.

It is conceivable to dispose the high heat generating electric component away from other electric components, but in that case, the structure becomes complicated, and the lead wire becomes long, increasing the noise generated, increasing the surge, and increasing the cost. There is a problem that leads to.

The present invention has been made in view of the above points, and by arranging a low-heat-generating electrical component and a high-heat-generating electrical component in different exhaust heat passages, a high-heat-generating electrical component is changed to a low-heat-generating electrical component. The purpose is to make it possible to suppress the heat influence of the.

[0006]

In the basic configuration of the present invention, as a means for solving the above problems, a heat exchange chamber 2 and a component storage chamber 3 are formed in a partition by a partition plate 11 in a casing 1. In the outdoor unit for an air conditioner in which the switch box 12 is attached to the partition plate 11,
The switch box 12 is provided with a first exhaust heat passage 37 for disposing a low heat generation electric component 27 having a small heat generation amount and a poor heat resistance, and a high heat generation electric component 31 having a large heat generation amount and a high heat resistance. The second heat exhaust passage 36 is provided to cool the low heat generating electrical component 27 and the high heat generating electrical component 31 separately.

In the basic configuration of the present invention, when the first and second exhaust heat passages 37 and 36 are communicated with the heat exchange chamber 2 through one exhaust port 15, the exhaust heat passages 37 and 36 are
It is preferable in that the outlet structure of 36 can be simplified.

When the amount of heat exhausted from the first exhaust heat passage 37 is set to be larger than the amount of exhaust heat from the second exhaust heat passage 36, cooling of the low heat generating electrical component 27 having poor heat resistance is effective. This is preferable because it can be performed and reliability is improved.

In addition, when the low heat generating electric component 27 is arranged in the switch box 12 and the high heat generating electric component 31 is arranged on the outer surface of the switch box 12,
This is preferable in that the influence of heat radiation from the high heat generating electric component 31 can be minimized.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

This outdoor unit for an air conditioner has a box-shaped casing 1, and the inside of the casing 1 has a heat exchanger 5
The heat exchange chamber 2 in which the fan 6 is disposed and the component storage chamber 3 in which the compressor 7 and various electric components are disposed are partitioned by a partition member 4 extending in the front-rear direction of the casing 1.

In the casing 1, air inlets 8 and 8 are formed on the back surface and one side surface of the heat exchange chamber 2, and an air outlet 9 is formed on the front surface of the heat exchange chamber 2. The heat exchanger 5 has an L-shaped cross section and is arranged along the air suction ports 8, 8. The fan 6 is of an axial flow type and is arranged so as to face the air outlet 9. Reference numeral 10 is a fan motor.

The partition member 4 partitions from the front surface 1a to the back surface 1b of the casing 1. In this embodiment, the partition member 11 is attached to the partition plate 11 (which will be described in detail later). Switch box 12
(See FIGS. 4 and 5).

As shown in FIGS. 4 and 5, the switch box 12 has a vertical surface 12a orthogonal to the front surface 1a of the casing and a rear side end portion of the first vertical surface 12a, which extends from the side surface to the side. Second vertical plane 12 extending at a right angle
b, a third vertical plane 12c extending forward from the side end of the second vertical plane 12b at a right angle, and the third vertical plane 1
4th extending from the front end of 2c to the side at a right angle
The vertical plane 12d and the first vertical plane 12a.
A flange portion 12e extending laterally is integrally provided at the front end portion of the. Reference numeral 13 is the flange portion 12e
Is a bottom plate that covers from the lower end to the center of the lower end of the second vertical surface 12b, and 14 is a horizontal flange that extends forward from the lower end of the fourth vertical surface 12d.

Further, the heat exchange chamber 2 on the first vertical surface 12a.
The side is provided with a hood 15 having a rectangular cross section which is located at the upper end and serves as an exhaust port for exhausting heat, and a large number of horizontal cooling fins 16, 16 located directly below the hood 15. ing.

The hood 15 has a U-shaped cross section whose upper and lower sides are open. The hood 15 has ribs 17 projecting from the first vertical plane 12a and an anti-first vertical section at the vertical middle portion and the lower end thereof. Ribs 18 are formed so as to project from the surface side to the position where the ribs 17 overlap with each other. By doing so, the inside of the hood 15 becomes a meandering passage formed by the ribs 17 and 18, and water that has entered the heat exchange chamber 2 does not enter the part storage chamber 3 side from below the hood 15. is there.

The cooling fins 16 are fixed to the first vertical surface 12a by means of screws or the like, and are arranged in the vertical direction of the first vertical surface 12a. The reason for doing this is that the air flow flowing in the heat exchange chamber 2 due to the operation of the fan 6 becomes a flow in the front-rear direction in the cooling fins 16, 16 ,.

As shown in FIGS. 1 and 4, the partition plate 11 is arranged in the component storage chamber 3 and has a shape in which the central portion is recessed to the heat exchange chamber 2 side so as to avoid interference with the compressor 7. It is said that the switch box 12 is provided at a substantially central portion thereof.
The notch hole 19 for attaching is formed (Fig. 3
reference).

On the other hand, the guide rails 21, 22 and 23 for engaging the front and rear edges 19a and 19b of the cutout hole 19 of the partition plate 11 with the flange portion 12e and the second vertical surface 12b of the switch box 12, respectively. , 24 are attached (see FIG. 4).

The guide rails 21, 22 and 23,
Of the 24, the guide rails 21 and 23 on the side of the parts storage chamber 3
Extends over the entire vertical length of the flange portion 12e and the second vertical surface 12b, and is guided by the guide rails 22, 24 on the heat exchange chamber 2 side.
Is shorter than the guide rails 21 and 23. By doing so, the cutout hole edges 19a, 19b are sandwiched between the guide rails 21, 22 and 23, 24, so that from the heat exchange chamber 2 side to the component storage chamber 3 via the engaging portions of both. Water will not enter and the waterproof effect will be improved. In addition, the guide rails 22 on the heat exchange chamber 2 side,
By making 24 shorter than the guide rails 21 and 23 on the side of the component storage chamber 3, the switch box 12 is separated by the partition plate 11
When installing in the notch hole 19 of the switch box 1
2 is inclined toward the heat exchange chamber 2 side, and the guide rails 21 and 23
If the notch hole edges 19a and 19b are abutted to the guide rails and slid downward, the guide rails 21, 22 and 23,
Since the cutout edges 19a and 19b can be easily engaged with 24, the switch box 12 can be easily and smoothly attached. The bottom plate 13 of the switch box 12
A seal member 20 is attached to the lower surface for ensuring water tightness with the lower edge of the cutout hole 19 (see FIGS. 2 and 5).

The upper end of the partition plate 11, the upper end of the flange portion 12e, which is closer to the heat exchange chamber 2 than the guide rails 21 and 22, the upper end of the first vertical surface 12a, excluding the attachment portion of the hood 15, and the upper end of the hood 15. Further, the portions of the upper end of the second vertical surface 12b closer to the heat exchange chamber 2 than the guide rails 23 and 24 are made to have the same continuous height, and constitute the partition member 4 that is brought into contact with the top plate 1c of the casing 1. Has become. Therefore, the upper surface of the hood 15 is also sealed by the casing top plate 1c, and the hood 1
Water does not enter the switch box 12 through the inside of the switch 5. That is, the casing top plate 1c also serves as the lid of the switch box 12. Reference numeral 25 is a seal member for ensuring water tightness with the casing top plate 1c and for preventing dew condensation on the casing top plate 1c.

By the way, on the side of the first accommodating chamber 12 of the first vertical plane 12a of the switch box 12, an inverter control element (for example, a power transistor) that heats up at a high temperature at the position corresponding to the cooling fins 16, 16 ... , Diode, etc.) 26 is attached. That is, the heat generated in the inverter control element 26 is radiated by the cooling fins 16, 16 ...

A control board 27 having various operation control elements is directly attached to the inverter element 26. The control board 27 is orthogonal to the front surface 1a of the casing 1 and in a vertical posture. Switch box 1
Are attached to the first vertical surface 12a of the second sheet 2 at appropriate positions via fasteners 38, 38 ,. In this way, the inverter control element 26 and the control board 2
7 and 7 are arranged in the switch box 12 while keeping the widthwise dimension as small as possible, and while the cooling performance of the inverter control element 26 is ensured, the switch box 12 can be made compact, lightweight, and costly. It is extremely advantageous for downing. The control board 27 is provided with various operation control elements, among which elements with high service frequency (for example, light emitting diode 28, connectors 29, etc.) are provided.
Etc.) are concentrated on the front side. If you do this,
Since the front surface 1a of the casing 1 (specifically, the front surface of the component storage chamber 3) is provided with a service lid (not shown), the control board 27 is disposed orthogonal to the front surface 1a of the casing 1. However, the serviceability will not be impaired.

An electric field capacitor 30 is attached to the front surface of the second vertical surface 12b of the switch box 12, and a reactor 31 is attached to the side surface of the third vertical surface 12c.
A noise filter 32 is attached, and a terminal block 33 for power supply connection is attached to the front surface of the fourth vertical surface 12d. Reactor 31 which is a high heat-generating electrical component that has a high temperature (for example, 170 ° C) during operation and has high heat resistance
Is a control board 27 that is a low-heat generation electric component that has a small amount of heat generated during operation and low heat resistance (for example, 60 to 80 ° C.).
The radiant heat from the reactor 31 does not reach the control board 27.

Further, a part of the upper end of the first vertical surface 12a (that is, the part surrounded by the hood 15) and a part of the upper end of the third vertical surface 12c in the switch box 12 are cutout portions 34 lower than the upper end of the hood 15. , 35.
Here, the cutout portion 34 surrounded by the hood 15 has the exhaust heat passage 3 from the component storage chamber 3 side to the heat exchange chamber 2 side as described later.
It becomes the exit of 6,37. Both the notches 34,
A baffle member 36 having a U-shaped cross section is provided between 35. The air guide member 36 has an action of connecting the first vertical plane 12a and the third vertical plane 12c of the switch box 12 to strengthen the rigidity of both vertical planes 12a and 12c.

The space surrounded by the first, second and third vertical planes 12a, 12b and 13c and the notch 34 in the first vertical plane 12a guide the air that has cooled the control board 27 to the hood 15. A first exhaust heat passage 37 for forming the cooling air is formed, and the baffle member 36 forms a second exhaust heat passage for guiding the air that has cooled the reactor 31 to the hood 15.

Therefore, by operating the fan 6, the fan 6
Since the air pressure on the windward side becomes negative, the air W ₁ (see FIG. 2 and FIG. 5) that has cooled the control board 27 passes through the first heat exhaust passage 37, the notch 34, and the hood 15 and the heat exchange chamber 2
The air W ₂ (see FIGS. 2 and 5) that has been sucked into and cooled the reactor 31 is sucked into the heat exchange chamber 2 via the second exhaust heat passage (that is, the air guide member 36) and the hood 15. It will be. That is, the first and second
The exhaust heat passages 37 and 36 are provided as one discharge port for the hood 15.
It is to be communicated with the heat exchange chamber 2 side via the.

That is, the reactor 3 which is a high heat generating electric component.
1 and the control board 27, which is a low heat-generating electric component having poor heat resistance, are arranged in separate heat exhaust passages 37 and 36, and the cooling performance of the reactor 31 can be ensured.
The thermal influence on the control board 27 can be effectively prevented. The cutout 3 is formed so that the amount of heat exhausted from the first exhaust heat passage 37 is larger than the amount of exhaust heat from the second heat exhaust passage 36.
The cross-sectional area of the cutout portion 34 is larger than the cross-sectional areas of the airflow guide member 36 and the baffle member 36. Reference numeral 39 is an air intake port to the component storage chamber 3.

[0029]

According to the present invention, the switch box 12 mounted on the partition plate 11 for partitioning the inside of the casing 1 into the heat exchange chamber 2 and the component storage chamber 3 has a low heat generation amount which is low in heat generation and inferior in heat resistance. A first exhaust heat passage 37 for arranging the component 27 and a second exhaust heat passage 36 for arranging the high heat generating electric component 31 having a large heat generation amount and high heat resistance are provided.
Since the low-heat generating electric component 27 and the high-heat generating electric component 31 are separately cooled, it is possible to suppress the heat influence from the high-heat generating electric component 31 to the low-heat generating electric component 27 as much as possible, and the low-heat generating electric component There is an excellent effect that the reliability of 27 can be secured.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a casing top plate of an outdoor unit for an air conditioner according to an embodiment of the present invention is removed.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a plan view of a switch box in the outdoor unit for an air conditioner according to the embodiment of the present invention.

FIG. 5 is a front view of the switch box in the air conditioner outdoor unit according to the embodiment of the present invention.

[Explanation of symbols]

1 is a casing, 2 is a heat exchange chamber, 3 is a component storage chamber, 5 is a heat exchanger, 6 is a fan, 11 is a partition plate, 12 is a switch box, 12a is a first vertical plane, 12b is a second vertical plane,
12c is a third vertical surface, 12d is a fourth vertical surface, 12e is a flange portion, 15 is a discharge port (hood), 27 is a low heat generating electric component (control board), 31 is a high heat generating electric component (reactor), and 36 is The second exhaust heat passage (air guide member), 37 is the first exhaust heat passage.

Claims (4)

[Claims] 1. A partition plate (11) is provided in a casing (1).
The heat exchange chamber (2) and the component storage chamber (3) are defined by the above, and the switch box (1) is attached to the partition plate (11).
2) An outdoor unit for an air conditioner, in which the switch box (12) is provided with a low heat generation electric component (27) having a small heat generation amount and poor heat resistance. A second exhaust heat passage (3) in which a passage (37) and a high heat-generating electric component (31) having a large amount of heat generation and high heat resistance are arranged.
6) An outdoor unit for an air conditioner, which is provided with. 2. The first and second exhaust heat passages (37),
The outdoor unit for an air conditioner according to claim 1, wherein the (36) is communicated with the heat exchange chamber (2) through one outlet (15). 3. The exhaust heat amount from the first exhaust heat passage (37) is set to be larger than the exhaust heat amount from the second exhaust heat passage (36).
The outdoor unit for an air conditioner according to any one of 1. 4. The low heat generating electric component (27) is arranged in the switch box (12), while the high heat generating electric component (31) is provided on an outer surface of the switch box (12).
The outdoor unit for an air conditioner according to any one of claims 1 to 3, wherein: