JP3079989B2 - Outdoor unit for air conditioner - Google Patents

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, and more particularly to a cooling structure for a switch box in an outdoor unit for an air conditioner.

[0002]

2. Description of the Related Art In general, the interior of a casing of an outdoor unit for an air conditioner is provided with a heat exchanger and a heat exchange chamber in which a fan is disposed without being affected by water. And a component storage chamber in which the components are disposed via a partition member extending in the front-rear direction of the casing (see, for example, Japanese Utility Model Laid-Open No. 1-116331). The storage was arranged.

[0003]

By the way, various electric parts are arranged in the switch box. These electric parts have high heat generation but high heat resistance and high heat generation electric parts (for example, reactors, etc.). ) And low heat-generating electrical components (for example, a control board or the like) that generate a small amount of heat but are inferior in heat resistance. When these components are arranged in a mixed manner, heat effects (for example, convection heat, Influence of radiant heat, etc.)
Is received by an electric component having poor heat resistance, and the reliability may be impaired.

It is conceivable to dispose the high heat-generating electric parts away from other electric parts. However, in this case, the structure becomes complicated and the lead wire becomes long, thereby increasing noise, surge, and cost. This leads to the problem that

[0005] 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, it is possible to change from a high heat generating electrical component to a low heat generating electrical component. The purpose of the present invention is to make it possible to suppress as much as possible the thermal effect of the above.

[0006]

According to the basic structure of the present invention, as a means for solving the above-mentioned problems, a heat exchange chamber 2 and a parts storage chamber 3 are defined in a casing 1 by a partition plate 11. In the air conditioner outdoor unit having the switch plate 12 attached to the partition plate 11,
The switch box 12 faces the heat exchange chamber 2 and
First lead perpendicular to the front surface 1a of the casing 1
Face 12a and the front side from the rear end of the first vertical face 12a.
A second extending at a right angle toward the side of the storage compartment 3;
A vertical surface 12b and a front end from a side end of the second vertical surface 12b.
And a third vertical surface 12c extending at right angles toward
And the upper end of the first vertical surface 12a and the third lead
When the upper end of the face 12c is connected with the wind guide member 36
The first, second and third vertical surfaces 12a, 12
b, and the enclosed space to 12c, while arranging the low heat generation electric component 27 calorific value is inferior to the small and heat resistance, the
Outside the third vertical surface 12c, a large amount of heat is generated and heat is applied.
A high-heat generating electric component 31 having high reliability is provided,
Surrounded by second and third vertical planes 12a, 12b, 12c
The space is cooled by the air for cooling the low heat generating electric component 27.
While the first exhaust heat passage 37 leading to the heat exchange chamber 2 is used ,
The air guide member 36 is separated from the high heat generating electric component 31 by cooling.
And a second exhaust heat passage 36 for guiding air to the heat exchange chamber 2,
The low heat generating electric component 27 and the high heat generating electric component 31 are separately cooled , and the high heat generating electric component 31 is changed to the low heat generating electric component 27.
To minimize the effect of thermal radiation . In addition, the air guide member 36 allows the switch box 12
The upper end of the first vertical surface 12a and the upper end of the third vertical surface 12c
Are connected, the rigidity of both vertical surfaces 12a, 12c
So that it can be enhanced.

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

When the amount of heat exhausted from the first heat exhaust passage 37 is set to be larger than the amount of heat exhausted from the second heat exhaust passage 36, the cooling of the low heat generating electric component 27 having poor heat resistance can be effectively performed. This is preferable in that reliability can be improved.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

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

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

The partition member 4 partitions the casing 1 from the front surface 1a to the rear surface 1b. In the present embodiment, the partition member 4 is attached to the partition plate 11 (to 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 first vertical surface 12a orthogonal to the front surface 1a of the casing, and a lateral surface extending from a rear end of the first vertical surface 12a. A second vertical surface 12b extending at a right angle toward the front surface, a third vertical surface 12c extending at a right angle forward from a side end of the second vertical surface 12b, and a third vertical surface 12c. A fourth vertical surface 12d extending at a right angle from the front end to the side, and the first vertical surface 1d.
2a, a flange portion 12e extending laterally
Are integrally extended. Reference numeral 13 denotes the flange 1
A bottom plate 14 covers from the lower end of 2e to the center of the lower end of the second vertical surface 12b, and 14 is a horizontal flange extending forward from the lower end of the fourth vertical surface 12d.

The heat exchange chamber 2 of the first vertical surface 12a
On the side, there is provided a hood 15 having a rectangular cross section which is located at the upper end and serves as a discharge port for exhausting heat, and a number of horizontal cooling fins 16 are provided immediately below the hood 15. ing.

The hood 15 has a U-shaped cross section open at the top and bottom, and has a rib 17 protruding from the first vertical surface 12a and an anti-first vertical at its middle part and lower end in the vertical direction. Ribs 18 protruding from the surface side to the position overlapping with the ribs 17 are formed. 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 component storage chamber 3 from below the hood 15. is there.

The cooling fins 16, 16,... Are fixed to the first vertical surface 12a by screws or the like, and are arranged in the vertical direction of the first vertical surface 12a. The reason for 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 disposed in the component storage chamber 3, and has a central portion recessed toward the heat exchange chamber 2 so as to avoid interference with the compressor 7. The switch box 12 is provided substantially at the center thereof.
A notch hole 19 for attaching a hole is formed.
reference).

On the other hand, guide rails 21, 22, and 23 for engaging the front and rear edges 19a, 19b of the notch 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,
24, the guide rails 21 and 23 on the component storage chamber 3 side.
Extend over the entire vertical length of the flange portion 12e and the second vertical surface 12b, and extend along 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 notch hole edges 19a, 19b are sandwiched between the guide rails 21, 22, 23, and 24, and from the heat exchange chamber 2 side to the component storage chamber 3 via the engaging portions of both. Water does not enter, and the waterproof effect is improved. Further, the guide rails 22 on the heat exchange chamber 2 side,
24 is shorter than the guide rails 21 and 23 on the component storage chamber 3 side, so that the switch box 12
When installing the switch box 1
2 is slightly inclined to the heat exchange chamber 2 side, and the guide rails 21 and 23
The guide rails 21, 22 and 23, 23
The engagement of the notch edges 19a, 19b with the notch 24 can be performed easily, so that the switch box 12 can be mounted easily and smoothly. Note that a seal member 20 for securing water tightness with the lower edge of the notch 19 is attached to the lower surface of the bottom plate 13 of the switch box 12 (FIGS. 2 and 5).
reference).

Then, the upper end of the partition plate 11, the portion of the flange 12e at the upper end of the guide rails 21 and 22 closer to the heat exchange chamber 2, the upper end of the first vertical surface 12a except for the mounting portion of the hood 15, and the upper end of the hood 15. And a portion of the upper end of the second vertical surface 12b closer to the heat exchange chamber 2 than the guide rails 23 and 24 is continuous at the same height, and constitutes the partition member 4 which is in contact with the top plate 1c of the casing 1. Has become. Accordingly, 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 box 5. That is, the casing top plate 1c doubles as the lid of the switch box 12. Reference numeral 25 denotes a seal member for ensuring watertightness with the casing top plate 1c and preventing dew condensation on the casing top plate 1c.

By the way, an inverter control element (for example, a power transistor) which generates heat at a high temperature when activated at a position corresponding to the cooling fins 16, 16,. , Diodes, etc.) 26 are 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 mounted on the inverter element 26. The control board 27 is perpendicular to the front surface 1a of the casing 1 and in a vertical posture. Switch box 1
2 are attached to the first vertical surface 12a at appropriate locations via fasteners 38, 38,. By doing so, the inverter control element 26 and the control board 2
7 are arranged in the switch box 12 with the widthwise dimension kept as small as possible, so that the cooling performance of the inverter control element 26 is ensured, and the size, weight and cost of the switch box 12 are reduced. This is extremely advantageous for downing. The control board 27 is provided with various operation control elements. Among them, the elements having a high service frequency (for example, the light emitting diode 28, the connectors 29
) Are concentrated on the front side. If you do this,
Since a service lid (not shown) is provided on the front surface 1a of the casing 1 (specifically, the front surface of the component storage chamber 3), the control board 27 is arranged orthogonal to the front surface 1a of the casing 1. Even so, serviceability will not be impaired.

An electric capacitor 30 is mounted on the front surface of the second vertical surface 12b of the switch box 12, and a reactor 31 is provided on the side surface of the third vertical surface 12c.
And a noise filter 32, and a terminal block 33 for power supply connection is mounted on the front surface of the fourth vertical surface 12d. Reactor 31 which is a high heat generating electric component which is high in temperature (for example, 170 ° C.) during operation and has high heat resistance.
Is a control board 27 which is a low heat generation electric component that generates a small amount of heat during operation and has low heat resistance (for example, 60 to 80 ° C.).
In this way, 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, a part surrounded by the hood 15) and a part of the upper end of the third vertical surface 12c of the switch box 12 are notched portions 34 lower than the upper end of the hood 15. , 35.
Here, the notch 34 surrounded by the hood 15 is provided with a heat exhaust passage 3 from the component storage chamber 3 side to the heat exchange chamber 2 side as described later.
It is the exit for 6,37. The two notches 34,
A baffle member 36 having a U-shaped cross section is provided between the members 35. The air guide member 36 has an effect of connecting the first vertical surface 12a and the third vertical surface 12c of the switch box 12 to enhance the rigidity of the vertical surfaces 12a and 12c.

The space surrounded by the first, second, and third vertical surfaces 12a, 12b, and 13c and the cutout portion 34 of the first vertical surface 12a guide the air that has cooled the control board 27 to the hood 15. And the wind guide member 36 constitutes a second heat exhaust passage for guiding the air that has cooled the reactor 31 to the hood 15.

Therefore, the operation of the fan 6
The air W ₁ (see FIGS. 2 and 5) that has cooled the control board 27 is supplied to the heat exchange chamber 2 through the first exhaust heat passage 37, the notch 34, and the hood 15.
The air W ₂ (see FIGS. 2 and 5) which has been sucked into the reactor 31 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 becomes. That is, the first and second
The exhaust heat passages 37 and 36 are provided in the hood 15 as one exhaust port.
And is communicated to 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 inferior heat resistance, are disposed in separate heat exhaust passages 37 and 36, so that the cooling performance of the reactor 31 can be secured.
This can effectively prevent the thermal influence on the control board 27. The notch 3 is formed so that the amount of heat exhausted from the first heat exhaust passage 37 is larger than the amount of heat exhausted from the second heat exhaust passage 36.
The cross-sectional area of the notch 34 is larger than the cross-sectional areas of the notch 5 and the air guide member 36. Reference numeral 39 denotes an air intake to the component storage chamber 3.

[0028]

According to the present invention, the inside of the casing 1 is heated.
Attached to the partition plate 11 that separates the exchange room 2 and the parts storage room 3
Switch box 12To the heat exchange chamber 2
And a second one orthogonal to the front surface 1a of the casing 1
1 vertical surface 12a and the back side end of the first vertical surface 12a
Extending toward the side of the component storage room 3 at a right angle.
From the second vertical surface 12b and a side end of the second vertical surface 12b
The third vertical plane 12c extending at right angles to the front
An upper end of the first vertical surface 12a and the second vertical surface 12a.
3 The upper end of the vertical surface 12c is connected with the wind guide member 36.
And the first, second and third vertical surfaces 12a, 1
In the space surrounded by 2b and 12cHas a small calorific value and
The low heat generation electric parts 27 which are inferior in heat resistanceMeanwhile, before
Outside the third vertical surface 12c, a large amount of heat is generated and
By disposing a high heat-generating electric component 31 having high heat resistance,
Surrounded by the second and third vertical planes 12a, 12b, 12c
The space for cooling the low heat generating electric components 27 is
Guide to heat exchange room 2A first exhaust heat passage 37;On the other hand, before
The air guide member 36 cooled the high heat generating electric component 31.
A second exhaust heat passage 36 for guiding air to the heat exchange chamber 2
And separate the low heat generating electric component 27 and the high heat generating electric component 31 from each other.
CoolingAnd low heat generation electric component 2 from high heat generation electric component 31
7 can minimize the effect of heat radiationDid
Therefore, the high heat generating electric component 31
Thermal effects can be suppressed as much as possible, and low heat generation electrical parts
There is an effect that the reliability of the product 27 can be ensured.

Moreover, the switch box is formed by the air guide member 36.
12 and the upper end of the first vertical plane 12a and the third vertical plane 12
c, so that both vertical surfaces 12a, 12
There is also an effect that the rigidity of c can be enhanced.

[Brief description of the 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 the 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 a switch box in the outdoor unit for an air conditioner according to the embodiment of the present invention.

[Explanation of symbols]

1 is a casing, 1a is a front surface, 2 is a heat exchange room, 3 is a parts storage room, 5 is a heat exchanger, 6 is a fan, 11 is a partition plate, 1
2 is a switch box, 12a is a first vertical surface, 12b is a second vertical surface, 12c is a third vertical surface, 12d is a fourth vertical surface, 12e is a flange portion, 15 is a discharge port (hood), 2
7 is a low heat-generating electric component (control board), 31 is a high heat-generating electric component (reactor), 36 is a second heat-dissipating passage (wind guide member),
37 is a first exhaust heat passage.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 5/00

Claims (3)

(57) [Claims] 1. A partition plate (11) in a casing (1).
A heat exchange chamber (2) and a component storage chamber (3) are formed by partitioning the switch box (1) on the partition plate (11).
2) An outdoor unit for an air conditioner to which the switch box (12) is attached, wherein the switch box (12) is attached to the heat exchange chamber (2).
Facing and against the front surface (1a) of the casing (1)
A first vertical surface (12a) orthogonal to the first vertical surface (12a);
a) from the rear end to the side of the component storage chamber (3).
The second vertical surface (12b) extending at a right angle,
2 At right angles to the front from the side edge of the vertical plane (12b)
And an extended third vertical surface (12c).
The upper end of the first vertical plane (12a) and the third vertical plane (1
2c) is connected to the upper end by a wind guide member (36).
In addition, the first, second and third vertical planes (12a),
In the space surrounded by (12b) and (12c), a low heat generation electric component (27) having a small heat generation and inferior in heat resistance is arranged, while a low heat generation electric component (27) is provided outside the third vertical plane (12c). , Departure
High heat generation electrical parts with large heat and high heat resistance (31)
And the first, second and third vertical planes (12
a), (12b), the space surrounded by (12c)
The air for cooling the low heat generating electric component (27) is supplied to the heat exchange chamber.
(2) a first exhaust heat passage (37) ,
The air guide member (36) cools the high heat generating electrical component (31).
Second exhaust heat passage for guiding the rejected air to the heat exchange chamber (2)
(36) An outdoor unit for an air conditioner, characterized in that: 2. The first and second heat exhaust passages (37),
The outdoor unit for an air conditioner according to claim 1, wherein (36) communicates with the heat exchange chamber (2) through one discharge port (15). 3. The heat exhaust amount from the first heat exhaust passage (37) is set to be larger than the heat exhaust amount from the second heat exhaust passage (36).
The outdoor unit for an air conditioner according to any one of the above.