JP2985758B2 - Control board fixing structure in 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 a control board fixing structure for 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, in the switch box,
A control board having various operation control elements is fixed,
This control board fixing structure prevents water from flowing from the heat exchange chamber side to the component storage chamber side (that is, the control board side) from the place where water is sucked into the heat exchange chamber side together with the air sucked by the fan. What you can do is required.

Conventionally, when the switch box itself is placed in a place where it is not exposed to water or where it is exposed to water, the switch box has a waterproof structure and a holding plate for fixing a control board is provided inside the switch box. Or was. In the former case, the location of the switch box is limited, and in the latter case, the structure of the switch box is complicated.

Therefore, in order to simplify the control board fixing structure, a structure in which the control board is fixed to the switch box via a fastener has conventionally been adopted.

[0006]

However, in this case,
Since it is necessary to form a hole for attaching a fastener in the switch box, there is a possibility that water may enter the control board through the hole, and it is necessary to take measures to prevent this. For example, if the control board is to be fixed by bolts, it is necessary to interpose a waterproof spacer between the control board and the switch box. If the control board is to be fixed via a snap-type support, the switch box side In order to prevent water intrusion from the hole for inserting the snap support formed in the, a waterproof cover covering the hole is required,
In both cases, the fixing structure of the control board becomes complicated, and the assembling workability also deteriorates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to enable a control board to be assembled to a switch box with a single touch and to effectively prevent water from entering the control board. It is intended for.

[0008]

According to the basic structure of the present invention, as a means for solving the above-mentioned problems, a casing 1 is provided in a partial storage chamber 3 formed separately from a heat exchange chamber 2. In a control board fixing structure in an outdoor unit for an air conditioner in which a control board 27 having various operation control elements is fixed to a switch box 12 via a fixing member 38, Control board 27
A support shaft 42 fixed to the switch shaft 12 and an engagement hole 40 formed in the switch box 12 at an end of the support shaft 42 are forcibly fitted from inside the switch box 12 and the engagement hole 40 Locking pawls 43, 43 engaged from the outside with the rims of the pair, and a pressure receiving pin located inside the locking claws 43, 43 and holding the rims of the engaging holes 40 together with the locking claws 43, 43. A surface 44 is provided so that the control board 27 can be mounted on the switch box 12 with one touch, and water can be prevented from entering the control board 27 side.

In the basic structure of the present invention, when the pressure receiving surface 44 is formed with ridges 47 for applying a high surface pressure to the edge of the engagement hole 40, the pressure reception surface 44 and the engagement hole This is preferable in that the pressure contact force with the edge of the forty becomes large, and water intrusion to the control board 27 side through the engagement hole 40 can be more effectively prevented.

When a seal member 48 is provided between the pressure receiving surface 44 and the edge of the engagement hole 40, the control board 2 is provided through the engagement hole 40 through the seal member 48.
This is preferable because the intrusion of water into the side 7 can be more effectively prevented.

[0011]

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 11 is attached to the partition plate 11 (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 perpendicular to the front surface 1a of the casing, and a lateral surface extending from the rear end of the first vertical surface 12a. Second vertical plane 12 extending at right angles
b, a third vertical surface 12c extending perpendicularly forward from a side end of the second vertical surface 12b, and a third vertical surface 1c.
4th extending perpendicularly to the side from the front end of 2c
The first vertical surface 12a.
A flange portion 12e extending laterally is integrally extended at a front end portion. Reference numeral 13 denotes the flange portion 12e.
A bottom plate 14 covers from the lower end of the second vertical surface 12b to the center of the lower end of the second vertical surface 12b. Reference numeral 14 denotes 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 are provided on the flange portion 12e and the second vertical surface 12b of the switch box 12. , 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 cutout edges 19a, 19b with the switch box 24 can be performed easily, and the mounting of the switch box 12 can be performed easily and smoothly. The bottom plate 13 of the switch box 12
A seal member 20 for securing water tightness with the lower edge of the notch 19 is attached to the lower surface (see FIGS. 2 and 5).

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) that 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 field 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 cut out 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.

[0030]

According to the present invention, a fixing member 38 for fixing the control board 27 to the switch box 12 includes a support shaft 42 fixed to the control board 27, and the support shaft 42.
At the end of the switch box 12, the engagement hole 40 formed in the switch box 12 is forcibly fitted from the inside of the switch box 12, and the engagement with the outside edge of the edge of the engagement hole 40 is performed. Claws 43, 43, and the engaging holes 40 inside the locking claws 43, 43 together with the locking claws 43, 43.
And the pressure receiving surface 44 for holding the rim of
The control board 27 can be attached to the switch box 12 with a single touch, and water can be prevented from entering the control board 27 side.
There is an excellent effect that a waterproof fixing structure of the control board 27 can be obtained by a simple configuration and an assembling operation.

[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 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.

FIG. 6 is an enlarged side view showing a control board fixing structure in the outdoor unit for an air conditioner according to the embodiment of the present invention.

FIG. 7 is an enlarged plan view showing a control board fixing structure in the outdoor unit for an air conditioner according to the embodiment of the present invention.

FIG. 8 is a front view of a fastener used for a control board fixing structure in the outdoor unit for an air conditioner according to the embodiment of the present invention.

[Explanation of symbols]

1 is a casing, 2 is a heat exchange room, 3 is a parts storage room, 12
Is a switch box, 12a is a first vertical plane, 12b is a second vertical plane, 12c is a third vertical plane, 12d is a fourth vertical plane,
12e is a flange portion, 38 is a fastening member, 40 is an engagement hole,
1 is an insertion hole, 42 is a support shaft, 43 is a locking claw, 44 is a pressure receiving surface, 46 is a flange, 47 is a ridge, and 48 is a seal member.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24F 5/00

Claims (3)

(57) [Claims] An operation control element is provided for a switch box (12) disposed in a partial storage chamber (3) formed in a casing (1) and separated from a heat exchange chamber (2). A control board fixing structure in an outdoor unit for an air conditioner, wherein the control board (27) is fixed via a fixing member (38), wherein the fixing element (38) is fixed to the control board (27). A support shaft (42) fixed to the support shaft (4);
At the end of 2), the switch box (12) is forcibly fitted into an engagement hole (40) formed in the switch box (12) from inside the switch box (12), and the engagement hole (40) is formed.
(43), (4)
3) and a pressure-receiving surface (44) inside the locking claws (43), (43) and holding the edge of the engaging hole (40) together with the locking claws (43), (43). A control board fixing structure in an outdoor unit for an air conditioner, characterized by comprising: 2. The pressure receiving surface (44) has a ridge (4) for applying a high surface pressure to an edge of the engagement hole (40).
The control board fixing structure for an outdoor unit for an air conditioner according to claim 1, wherein (7) and (47) are formed. 3. The pressure receiving surface (44) and the engagement hole (4).
The control board fixing structure in the outdoor unit for an air conditioner according to any one of claims 1 and 2, wherein a seal member (48) is interposed between the rim and the rim of (0). .