JP4396658B2 - Electrical component box - Google Patents

Description

  The present invention relates to an electrical component box.

An air conditioner generally includes an outdoor unit and an indoor unit. Then, an electrical component box 51 as shown in FIG. 7 is disposed in the outdoor unit, and a substrate 54 on which various electrical components 52... Are mounted is accommodated in the electrical component box 51. By the way, since the outdoor unit is installed outside, rainwater, mist, etc. enter the outdoor unit casing 53 through an opening provided in the outdoor unit casing 53, and the moisture drops on the substrate 54. Furthermore, there is a possibility that internal dew condensation water due to snow accumulation in the winter may drip onto the substrate 54. If moisture drops on the substrate 54, the electrical component is damaged, and conventionally, the upper opening of the electrical component box 51 is covered with a cover 55 (see, for example, Patent Document 1). .
Japanese Patent No. 3075099 (page 2-4, FIG. 1 and FIG. 2)

  However, as described above, various types of electrical components 52 are accommodated in the electrical component box 51, and some of the electrical components 52 also have heat generating components. Therefore, if the upper opening of the electrical component box 51 is covered with the cover 55, the interior of the electrical component box 51 becomes a so-called sealed body, and the heat generating component (electronic component) generates heat and the temperature gradually increases. For this reason, the electronic component may be damaged, or the original function as the electronic component may not be exhibited, and the air conditioner may not be driven normally.

  Therefore, conventionally, an opening is provided in the cover 55 in order to allow cooling air to flow into the electrical component box 51. However, if the cover 55 is provided with an opening, rainwater or the like enters the electrical component box 51 through the opening, and the use of the bar 55 has become meaningless.

  In addition, when dripping of moisture onto the substrate 54 occurs, the substrate 54 may be waterproof-coated to prevent the dripped moisture from adhering to the solder surface or the like of the substrate 54. However, if waterproof coating is applied, the cost is high.

  The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to prevent moisture from dripping onto the substrate and to provide an air passage for cooling electrical components (heat-generating components). The object is to provide an electrical component box that can be secured.

Accordingly, the electrical component box according to claim 1 is an electrical component box used for the outdoor unit 2 of the air conditioner, and includes a box body 11 that houses the substrate 10 on which the electrical component S is mounted. The upper peripheral opening 21 is covered with a double-structured cover member 12 composed of inner and outer covers 15, 16, and a suspended peripheral wall 21 of the inner cover 15 of the cover member 12 The hanging peripheral wall 18 of the outer cover 16 of the cover member 12 is disposed outside the rising peripheral wall 14 of the box body 11 while being disposed inside the wall 14 .

In the electrical component box according to the first aspect, since the cover member 12 has a double structure composed of the inner and outer covers 15 and 16, moisture is dripped onto the substrate 10 due to intrusion of rainwater or mist, or condensed water due to snow accumulation in winter. Can be effectively prevented from dripping onto the substrate 10. Accordingly, the electrical component S on the substrate 10 can be effectively protected, and a waterproof coating or the like performed so that moisture dropped on the substrate 10 does not penetrate the solder surface or the like can be omitted. Further, even if notches and the like are provided in the inner and outer covers 15 and 16 in order to introduce cooling air into the electrical component box, the notch positions can be made different between the inner and outer covers 15 and 16. Thereby, the function (drip-proof property) which prevents the dripping etc. of the water | moisture content on the board | substrate 10 by the rain water of the cover member 12 and the penetration | invasion of a mist is not impaired. Further, in the electrical component box, the hanging peripheral wall 21 of the inner cover 15 of the cover member 12 is disposed inside the rising peripheral wall 14 of the box body 11 and the hanging peripheral wall of the outer cover 16 of the cover member 12. 18 is disposed outside the rising peripheral wall 14 of the box body 11, so that the rising peripheral wall 14 of the box body 11 is sandwiched between the hanging peripheral walls 21 and 18 of the inner and outer covers 15 and 16. It becomes. For this reason, even if mist (liquid fine particles) enters from a gap between the hanging peripheral wall 18 of the outer cover 16 and the rising peripheral wall 14 of the box body 11, the mist enters between the inner and outer covers 15 and 16. Therefore, it is difficult to enter the box body 11.

  The electrical component box according to claim 2 is characterized in that the inner cover 15 of the cover member 12 is made of a transparent plastic.

  In the electrical component box according to the second aspect, since the inner cover 15 of the cover member 12 is transparent, if the outer cover 16 is removed, the electrical component S or the like on the substrate 10 can be observed with the inner cover 15 attached. Can do.

The electrical component box according to claim 3 is characterized in that a harness lead-out portion 30 is provided in the cover member 12.

In the electrical component box according to the third aspect , since the harness lead-out portion 30 is provided in the cover member 12, extreme bending and routing of the harness 27 can be avoided.

  In the electrical component box, an air entry port 25 is provided in the rising peripheral wall 14 of the box body 11, and an air passage 23 for cooling the electrical component S in the box body 11 is provided in the cover member 12. The air from the air entry port 25 may be configured to flow into the air passage 23.

    In the electrical component box, since the air that has entered the air intrusion port 25 of the rising peripheral wall 14 of the box body 11 flows into the air passage 23, the electrical component S inside the box body 11 is moved by the inflowed air. Can be cooled. For this reason, it is possible to prevent the electrical components from being damaged or malfunctioning, and this air conditioner can perform stable operation over a long period of time.

According to the electrical component box of claim 1, since the cover member has a double structure composed of the inner and outer covers, dripping water onto the substrate due to intrusion of rainwater or mist, or onto the substrate of condensed water due to snow accumulation in winter. Can be effectively prevented from dripping. As a result, the electrical components on the substrate can be prevented from being damaged, and the air conditioner in which the electrical component box is used can be stably operated over a long period of time. For this reason, it is possible to omit a waterproof coating or the like to prevent moisture dripped onto the substrate from penetrating the solder surface and the like, and to improve the assembly workability. Moreover, even if the cost is increased due to the use of the cover member having a double structure, the cost of the waterproof coating can be reduced, and this reduction can be offset. Further, even if notches and the like are provided in the inner and outer covers in order to introduce cooling air into the electrical component box, the notch positions can be made different between the inner and outer covers. Thereby, the function (drip-proof property) for preventing dripping of moisture onto the substrate due to rainwater or fog entering the cover member is not impaired. Therefore, protection of electrical components can be achieved effectively. In addition, according to the electrical component box, even if mist (liquid fine particles) enters from the gap between the hanging peripheral wall of the outer cover and the rising peripheral wall of the box body, the mist enters between the inner and outer covers. As a result, it is difficult to enter the inside of the box body. For this reason, an electrical component can be protected effectively.

  According to the electrical component box of the second aspect, since the inner cover of the cover member is transparent, the electrical component on the substrate can be observed with the inner cover attached when the outer cover is removed. For this reason, even if the cover member has a double structure, it is possible to observe the connection state of the harness (electric wire) (connector disconnection, etc.) and the display status of the failure indicator lamp, and maintenance can be easily performed. .

According to the electrical component box of the third aspect , since the harness lead portion is provided in the cover member, it is possible to avoid extreme bending and routing of the harness. For this reason, shortening of an electric wire (shortening of a harness) can be achieved, and noise generation can be prevented.

  Specific embodiments of the terminal board of the present invention will be described in detail with reference to the drawings. FIG. 1 is a simplified perspective view of an electrical component box. This electrical component box 1 is used for an outdoor unit 2 of an air conditioner. As shown in FIG. 6, the air conditioner includes the outdoor unit 2 and the indoor unit 3, and performs an air conditioning operation or the like.

  That is, the outdoor unit 2 includes a compressor 5, a four-way valve 6, an outdoor heat exchanger 7, an expansion valve 8, and the like, and these are housed in an outdoor unit casing 9 as shown in FIG. In FIG. 1, only the outdoor heat exchanger 7 is shown for the sake of simplification of the drawing. The indoor unit 3 includes an indoor heat exchanger 4 and the like. In this case, the indoor heat exchanger 4 and the like are housed in an indoor unit casing (not shown). For this reason, for example, in order to perform the cooling operation, the compressor 5 is driven by switching the four-way valve 6 to the state indicated by the solid line in FIG. 6. By driving the compressor 5, the refrigerant sequentially flows from the compressor 5 to the four-way valve 6, the outdoor heat exchanger 7, the expansion valve 8, the indoor heat exchanger 4, and the four-way valve 6 to the compressor 5. Return. As a result, the outdoor heat exchanger 7 functions as a condenser, and the indoor heat exchanger 4 functions as an evaporator, so that a cooling operation is performed. In order to perform the heating operation, the compressor 5 is driven by switching the four-way valve 6 to the state indicated by the broken line in FIG. By driving the compressor 5, the refrigerant sequentially flows from the compressor 5 to the four-way valve 6, the indoor heat exchanger 4, the expansion valve 8, the outdoor heat exchanger 7, and the four-way valve 6 to the compressor 5. Return. As a result, the indoor heat exchanger 4 functions as a condenser, and the outdoor heat exchanger 7 functions as an evaporator, so that a heating operation is performed.

  As shown in FIG. 1, the electrical component box 1 is disposed in an outdoor unit casing 9 and accommodates a substrate (printed substrate) 10 on which various electrical components S ·· are mounted. In this case, the electrical component box 1 includes a box body 11 in which the substrate 10 is accommodated, and the box body 11 is covered with a cover member 12. The box body 11 is composed of a box body having an upper opening shape having a bottom wall 13 and a rising peripheral wall 14 erected from the outer peripheral edge of the bottom wall 13, and the upper opening portion covers the cover. Covered with member 12.

  The cover member 12 is for drip-proofing preventing rain water and the like from entering the box body 11 and has a double structure of inner and outer covers 15 and 16. The outer cover 16 includes an upper wall 17 and a suspended peripheral wall 18 depending from the outer peripheral edge of the upper wall 17. When the outer cover 16 is attached to the box body 11 as shown in FIG. It is arranged outside the upright peripheral wall 14 of the box body 11. The inner cover 15 includes an upper wall 20 and a suspended peripheral wall 21 depending from the outer peripheral edge of the upper wall 20, and when the inner cover 15 is attached to the box body 11, the suspended peripheral wall 21 is a rising periphery of the box body 11. It is arranged inside the wall 14.

  As shown in FIG. 1, the hanging peripheral wall 21 of the inner cover 15 is provided with notches 22..., And the electrical components S inside the box body 11 are cooled by the notches 22. An air passage 23 is formed. That is, in the inner cover 15 shown in FIG. 1, two notches 22a and 22b are formed. For example, if one notch 22a is used as the inlet of the air passage 23, the other notch 22b is formed. Becomes the outlet of the air passage 23. And the notch parts 24 and 24 are provided also in the standing surrounding wall 14 of the box main body 11, and the one notch part 24 corresponding to said one notch part 22a comprises the air intrusion port 25, and said other side The other notch 24 corresponding to the notch 22b constitutes an air outlet 26.

  The inner cover 15 is made of a transparent plastic such as PVC (polyvinyl chloride). This PVC is excellent in water resistance, flame retardancy, weather resistance and the like. As described above, the inner cover 15 is made of transparent plastic, so that the outer cover 16 is removed and the board 10 of the box body 11 and the electrical components mounted (mounted) on the board 10 from the outside of the inner cover 15. S ·· can be observed. In addition, as the outer cover 16, various plastics and metals excellent in water resistance etc. can be used, and they may be transparent or opaque. Further, when the inner and outer covers 15 and 16 are attached to the box body 11, for example, locking means (not shown) for locking (for example, a locking claw and a locking claw with which the locking claw is detachably locked). It is preferable to be held in a state of being locked to the box body 11 by a convex portion or the like), but it may be simply fitted without providing such locking means.

  By the way, since the harness (electric wire) 27 (see FIG. 3) is wired (connected) to the connector of the substrate 10, the harness lead-out portion 30 is formed in the cover member 12. That is, as shown in FIG. 3, an L-shaped receiving piece 33 composed of a bottom 31 and an upright portion 32 is provided on a part of the inner surface of the rising peripheral wall 14 of the box body 11 and corresponds to this. An opening 34 is provided in the rising peripheral wall 14. That is, in the harness lead-out portion 30, the rising portion 32 of the receiving piece 33 faces the opening 34 of the rising peripheral wall 14. In this case, the harness 27 is inserted into the box body 11 from the opening 34 of the rising peripheral wall 14 and is temporarily received by the receiving piece 33, and the connector is connected to the connector on the substrate 10.

  According to the electrical component box, the hanging peripheral wall 21 of the inner cover 15 of the cover member 12 is arranged inside the rising peripheral wall 14 of the box body 11 and the hanging peripheral wall of the outer cover 16 of the cover member 12. 18 is disposed outside the rising peripheral wall 14 of the box body 11, so that the rising peripheral wall 14 of the box body 11 is sandwiched between the hanging peripheral walls 21 and 18 of the inner and outer covers 15 and 16. It becomes. For this reason, even if mist (liquid fine particles) enters from a gap between the hanging peripheral wall 18 of the outer cover 16 and the rising peripheral wall 14 of the box body 11, the mist enters between the inner and outer covers 15 and 16. Therefore, it is difficult to enter the inside of the box body 11, that is, the substrate 10 side. Further, since the inner cover 15 of the cover member 12 is transparent, if the outer cover 16 is removed, the electrical components on the substrate 10 can be observed while the inner cover 15 is attached. For this reason, even if the cover member 12 has a double structure, the connection state (connector disconnection, etc.) of the harness (electric wire) 27 and the display state of the failure indicator lamp 28 can be observed, and maintenance inspection is easily performed. be able to. The failure indicator lamp 28 is lit when an abnormal state such as an abnormal operation occurs. The failure indicator lamp 28 is provided on the substrate 10, and an abnormal state (failure state) is generated by the lighting of the failure indicator lamp 28. ) Can be detected. Moreover, in the said embodiment, since the inner cover 15 is comprised from PVC, it can set freely from hard to soft by adjustment of a plasticizer etc., Thereby, intensity | strength and rigidity can also be changed, and this cover The member 12 can be easily formed of an optimal material. Moreover, PVC is recyclable and is excellent in terms of resource saving.

  Furthermore, since the harness lead-out portion 30 is provided in the cover member 12, extreme bending and routing of the harness 27 can be avoided. Moreover, in this harness lead-out portion 30, the rising portion 32 of the receiving piece 33 faces the opening 34 of the rising peripheral wall 14, so that even if mist or the like enters the rising peripheral wall 14 from the opening 34. The mist and the like are received at the rising portion 32 and the bottom portion 31 and do not enter the box body 11. Furthermore, since the air that has entered the air intrusion port 25 of the rising peripheral wall 14 of the box body 11 flows into the air passage 23, the electrical component S inside the box body 11 can be cooled. As a result, the electrical component S (heat generating component) can be cooled, and the electrical component S can be prevented from being damaged or malfunctioning, and the air conditioner can perform stable operation over a long period of time. Moreover, since the cover member 12 has a double structure comprising the inner and outer covers 15 and 16, even if notches are provided in the inner and outer covers 15 and 16 in order to introduce cooling air into the electrical component box. The notch positions can be made different between the inner and outer covers 15 and 16. Accordingly, the function (dripproofness) of preventing dripping of moisture onto the substrate 10 due to rainwater or mist intrusion of the cover member 12 is not impaired.

  Next, FIGS. 4 and 5 show another embodiment. In this case, a plurality of slit-like through holes 35 are provided in a part of the rising peripheral wall 14 of the box body 11, and the through holes 35. The air entry port 25 is Correspondingly, a receding wall portion 36 that is receded to a part of the suspended peripheral wall 21 of the inner cover 15 is formed, and thereby an opening that opens in a direction substantially perpendicular to the opening direction of the through holes 35. A portion 37 is formed. A wind introduction guide portion 39 is provided at the upper opening edge of each through hole 35. In this wind introduction guide portion 39, wind is introduced from below into each through hole 35... As indicated by arrow A in FIG.

  The air from the air intrusion port 25 enters the space 38 formed by the receding wall portion 36 and the rising peripheral wall 14 of the box body 11, and then changes its direction to open the box body from the opening 37. 11 inside. That is, air from the air intrusion port 25 enters from below and once hits the receding wall portion 36 and then enters the inside of the box body 11, so that air does not directly enter the inside of the box body 11. Further, dripping of moisture onto the substrate 10 can be prevented. Also in this case, if the inner cover 15 is made of transparent plastic, the failure indicator lamp 28 on the substrate 10 can be observed through the inner cover 15.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the inner cover 15 can be made of various transparent plastics other than PVC (polyvinyl chloride), but preferably has excellent water resistance and can be recycled. Further, the notch shape, size, number, and the like of the notch portion 22 of the inner cover 15 for forming the air passage 23 can be arbitrarily changed. However, rainwater or the like can enter the box body 11 in the air passage 23. Therefore, it is necessary that the moisture does not drip onto the substrate 10.

It is a simplified perspective view which shows embodiment of the electrical component box of this invention. It is a principal part simplified sectional view of the said electrical component box. It is other principal part simplified sectional drawing of the said electrical component box. It is a principal part perspective view which shows other embodiment of the electrical component box of this invention. It is a principal part top view of the said electrical component box. It is a simplified diagram of an air conditioner using the electrical component box. It is a simplified perspective view of the conventional electrical component box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Outdoor unit 10 Board | substrate 11 Box body 12 Cover member 14 Standing peripheral wall 15 Inner cover 16 Outer cover 18 Hanging peripheral wall 21 Hanging peripheral wall 23 Air passage 25 Air intrusion port 30 Harness extraction part S Electric component

Claims (3)

An electrical component box used for an outdoor unit (2) of an air conditioner, comprising a box body (11) for storing a substrate (10) on which the electrical component (S) is mounted, and the box body (11) of the upper opening has a structure covering at inner and outer cover (15) (16) cover a double structure composed of (12), hanging wall (21 of the inner cover (15) of the cover member (12) ) Is disposed inside the rising peripheral wall (14) of the box body (11), and the hanging peripheral wall (18) of the outer cover (16) of the cover member (12) is connected to the box body (11). ) Is disposed outside the rising peripheral wall (14) . The electrical component box according to claim 1, wherein the inner cover (15) of the cover member (12) is made of transparent plastic. The electrical component box according to claim 1 or 2 , wherein a harness lead-out portion (30) is provided on the cover member (12).