JP2009257674A - Electronic control device for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein even though in conventional electronic control devices for an air conditioner, for protecting electrical components from small animals, insects, dust, and moisture, coating of an insulating coating material or covering by a protective film has been performed, protection has not been sufficient due to the variations caused by working conditions in coating and part leads. <P>SOLUTION: This electronic control device has a detachable resin cover 2, covering a soldered part 3 of a printed wiring board 5, thereby obtaining a structure capable of stably protecting a charging part from foreign matter and moisture simply and positively over a long period of time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic control device mounted on an air conditioner.

Conventionally, in order to prevent electrical insulation and intrusion of moisture and foreign matter, there are those that protect the solder side charging portion by applying an insulating coating material or the like to the solder joint surface or covering with a protective film (for example, Patent Document 1).
Japanese Utility Model Publication No. 06-13176

  Among electronic control devices for air conditioners, especially those mounted on the outside of a separate type, the arrangement may be stored with the solder joint surface facing upward, and the heat generated by the mounted components may be reduced. In order to suppress it, there are cases where it cannot be stored in a sealed body. In such a case, insects, small animals, dust, etc. entering from the outside can easily fly and accumulate on the solder joint surface of the control device. The charging part on the control device was broken short-circuited, resulting in the worst fire.

In addition, as a countermeasure, there is a method to avoid the above problem by applying an insulating coating material to the solder joint surface. Can not be protected, especially the lead end part of the solder side of the part is often not completely coated, man-hours are required for the work and the material cost is high, it is not possible to move to the next process until the insulating coating material is dried, When an insulating coating material is applied, parts cannot be replaced when a failure occurs in some parts on the electronic control unit, so the entire electronic control unit must be replaced, which is uneconomical. There are also problems. Even in the method of covering with a protective film, there are similar problems such as damage to the film due to the component lead and inability to completely re-cover after replacement of the component.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and aims to solve a number of problems in applying the insulating coating material and covering with a protective film, and to reliably protect a charged part at low cost. .

  In order to solve the above-mentioned conventional problems, an electronic controller for an air conditioner according to the present invention is provided with a resin cover that can be attached to and detached from a solder joint surface.

  The electronic control device for an air conditioner according to the present invention eliminates a number of problems in applying the insulating coating material by providing a removable resin cover on the solder joint surface of the electronic control device, and is inexpensive and reliable. The live part can be protected.

  In the first invention, by providing a removable resin cover on the solder joint surface of the electronic control device, it is possible to prevent short-circuit destruction of the charging unit on the control device due to accumulation of foreign matter such as insects and small animals and dust. It becomes possible.

In the second invention, the resin cover described in the first invention is adhered to the surface of the printed circuit board, and the periphery is structured without a gap, thereby preventing not only foreign matter but also moisture and moisture from entering. Therefore, it is possible to prevent problems such as tracking destruction.

  The third invention is more reliable by attaching a sealing material such as an EPT sealer (sponge-like dustproof or waterproof sealing material) to the joint between the resin cover described in the second invention and the printed circuit board surface. It is possible to prevent moisture and moisture from entering.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view for explaining a first embodiment of the present invention. Various electronic and electrical components 1 are mounted on a printed circuit board 5 on which a circuit pattern made of copper foil is formed. After the electronic control device is configured by being connected to each other, it is housed in a separate air conditioner with the solder joint surface facing up.

  A resin cover 2 is disposed on the solder surface side of the printed circuit board 5, and is fixed to the printed circuit board 5 with a structure that can be attached and detached by the integrally formed latching claws 4.

  With the above configuration, the electronic control device for an air conditioner according to the present invention prevents accumulation of foreign matters such as insects and small animals and dust flying from the upper side with respect to the solder surface side of the printed circuit board 5 by the resin cover 2. Therefore, it is possible to prevent the charging unit on the electronic control device from being short-circuited.

(Embodiment 2)
FIG. 2 is a plan view for explaining a second embodiment of the present invention, in which ribs are provided from the peripheral end face of the resin cover 2 explained in the first embodiment to the solder surface side surface of the printed circuit board 5 without a gap. Therefore, in addition to the effects described in the first embodiment, it is possible to prevent moisture and moisture from entering from the side surface side, so that it is possible to prevent dielectric degradation breakdown of the charged part due to tracking or the like.

(Embodiment 3)
FIG. 3 is a plan view for explaining the third embodiment of the present invention. By attaching a sealing material 6 such as an EPT sealer to the joint between the resin cover and the printed circuit board surface explained in the second embodiment. By completely sealing without a gap, it becomes possible to more reliably prevent intrusion of moisture, moisture and the like.

  As described above, the electronic control device for an air conditioner according to the present invention is provided with a removable resin cover on the solder joint surface of the electronic control device. It is possible to provide an electronic control device that enables protection.

Side view of the electronic control unit according to Embodiment 1 of the present invention. Side view of the electronic control unit according to Embodiment 2 of the present invention. Side view of the electronic control unit according to Embodiment 3 of the present invention. Side view of a conventional electronic control unit coated with an insulating coating material

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Various electronic and electrical parts 2 Resin cover 3 Soldering part 4 Hanging nail 5 Printed wiring board 6 Sealing material 7 Insulating coating

Claims (3)

Various electronic and electrical components housed in an air conditioner are mounted on a printed wiring board that constitutes a circuit using copper foil or the like, and the various electronic and electrical components are electrically connected using electrical joining means such as solder. An electronic controller for an air conditioner, wherein the joint surface of solder or the like is covered with a removable resin cover. An electronic control device for an air conditioner, characterized in that the resin cover according to claim 1 is in close contact with the surface of the printed circuit board and has no gap around the periphery. An electronic control device for an air conditioner, wherein a sealing material such as an EPT sealer (sponge-like dustproof, waterproof sealing material) or the like is attached to a joint between the resin cover and the printed circuit board surface according to claim 2.

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