JP6380137B2 - Air conditioner electrical component box - Google Patents

Description

  The present invention relates to an electrical component box of an air conditioner on which a control circuit for controlling the air conditioner is mounted.

  In an air conditioner, an electrical unit box including a power supply circuit unit and a control circuit unit for controlling the operation of the air conditioner is provided in the indoor unit.

  The power supply circuit unit takes in commercial power and performs AC / DC conversion to generate an internal DC power supply. The control circuit unit controls the air conditioner according to a remote control signal transmitted from the remote controller or detection signals from various sensors provided in the air conditioner. Each of these power supply circuit units and control circuit units is composed of a large number of electronic components (for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-230568

  However, in general, the electrical component box is not subjected to forced heat removal by a dedicated heat-dissipating fan, etc., so that heat easily accumulates in the upper part of the electrical component box housing, and the upper part has an electronic component with a low heat-resistant temperature, for example, smoothness. If an electronic component such as a capacitor is arranged, the life of the electronic component may be shortened.

  An object of the present invention is to provide an electrical component box in which the life of an electronic component is not shortened by heat trapped inside the electrical component box.

In order to achieve the above object, according to a first aspect of the present invention, there is provided an electrical component box vertically mounted on an outer surface of a side plate of an indoor unit of an air conditioner, and disposed in a vertical posture inside the electrical component box. A power supply circuit unit including power supply circuit components; a control circuit unit disposed side by side with the power supply circuit unit in a vertical posture inside the electrical component box; and the control circuit unit in a vertical posture within the electrical component box and the terminal block fitting disposed side by side and the power supply circuit unit downward, and a power supply terminal block connected to the mounting et been pre Symbol power supply circuit to the terminal block fitting, attached to the terminal block fitting An electronic component having a high heat resistant temperature among the electronic components mounted on the power supply circuit portion and the control circuit portion, and having a low heat resistant temperature. is disposed below, prior Symbol end Kodai before Characterized in that it is located below the terminal block.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the lifetime of an electronic component with a low heat-resistant temperature becomes short with the heat which remains inside an electrical component box.

It is a perspective view of the indoor unit of an air conditioner. It is a front view of the main body of the electrical component box of this invention. It is a bottom view of the main body of the electrical component box of this invention. It is a right view of the main body of the electrical component box of this invention. It is a schematic wiring diagram inside the electrical component box of this invention.

  FIG. 1 shows an indoor unit of an air conditioner. This indoor unit includes an indoor unit main body 100 and an electrical component box 200. The indoor unit main body 100 includes an air inlet 101 that sucks in indoor air, an air outlet 102 that exchanges heat with the refrigerant and blows it into the room, and an interior that connects the inlet 101 and the outlet 102. The fan apparatus (not shown) arrange | positioned in the air flow path of this and the heat exchanger 103 are provided. And the electrical component box 200 is attached to the outer surface of the right side plate 104 on the right side as viewed from the air outlet 102 side of the indoor unit main body 100 in a vertical posture.

  The electrical component box 200 includes a casing 210 including a sheet metal casing main body 211 and a sheet metal lid 212 that closes the front of the casing main body 211.

  As shown in FIG. 1, the lid 212 is formed by folding a front plate 212A, an upper plate 212B formed by bending the upper portion of the front plate 212A, and a lower portion of the front plate 212A to the same side as the upper plate 212B. It is comprised with the lower surface board 212C. That is, the lid 212 is substantially U-shaped in the vertical direction by the front plate 212A, the upper surface plate 212B, and the lower surface plate 212C.

  As shown in FIG. 2, the housing main body 211 has a bottom plate 211A that is in a vertical position when the electrical component box 200 is attached to the outer surface of the right side plate 104 of the indoor unit main body 100, and a left side of the bottom plate 211A. The left side plate 211B is formed, and the right side plate 211C is formed by bending the right side of the bottom plate 211A to the same side as the left side plate 211B. That is, the housing body 211 is substantially U-shaped in the lateral direction by the bottom plate 211A, the left side plate 211B, and the right side plate 211C. An upper mounting piece 211A1 for attaching to the right side plate 104 of the indoor unit main body 100 with a screw is formed on the top of the bottom plate 211A, and a similar lower mounting piece 211A2 is formed on the bottom of the bottom plate 211A. Yes.

  As shown in FIG. 2, a terminal block fixture 220 is attached to the bottom plate 211A of the housing body 211 in the lower right corner surrounded by the right side plate 211C and the lower attachment piece 211A2 in parallel with the bottom plate 211A. . A filter substrate 230 parallel to the bottom plate 211A is attached to the left side of the terminal block fixture 220. Further, the smoothing capacitor 240 is attached to the bottom face plate 211A in the lower left corner surrounded by the left side face plate 211B and the lower attachment piece 211A2. A thermistor 250 having a positive temperature coefficient is attached to the bottom plate 211A adjacent to the upper left side of the filter substrate 230. A diode bridge 260 is attached to the bottom plate 211A adjacent to the thermistor 250. Further, the reactor 270 is attached to the bottom face plate 211A in the upper left corner surrounded by the left side face plate 211B and the upper mounting piece 211A1. A power supply substrate 280 is attached in parallel to the bottom plate 211A on the right side of the thermistor 250, the diode bridge 260, and the reactor 270. In addition, an operation board 290 is attached to the upper right corner surrounded by the upper attachment piece 211A1 and the right side plate 211C in parallel to the bottom plate 211A. Further, the control board 300 is attached to the bottom plate 211A between the operation board 290 and the terminal block attachment 220. As shown in FIGS. 1 and 4, a wiring insertion plate 310 is attached to a portion of the right side plate 211 </ b> C adjacent to the terminal block fixture 220.

  As shown in FIG. 5, the filter substrate 230, the smoothing capacitor 240, the thermistor 250, the diode bridge 260, the reactor 270, and the power supply substrate 280 constitute a power supply circuit unit 200A. Further, the operation board 290 and the control board 300 constitute a control circuit unit 200B, and operate by receiving power supply from the power supply circuit unit 200A.

  In FIG. 2, the power supply terminal block 221 is mounted on the lower side, the control terminal block 222 on the upper side, and the fuse holder 223 on the left side. The control terminal block 222 is disposed adjacent to the control board 300. A power cable (not shown in FIG. 2) connected to the power terminal block 221 and drawn to the outside is drawn from the insertion hole 311 of the wiring insertion plate 310 of the right side plate 211C shown in FIG. Further, a control cable (not shown in FIG. 2) connected to the control terminal block 222 and drawn to the outside is drawn out from the insertion hole 312 of the wiring insertion plate 310 shown in FIG.

  A coil 231 is mounted on the filter substrate 230 and cooperates with the thermistor 250 to suppress surge current absorption, external noise absorption, and inrush current suppression to the smoothing capacitor 240 at startup. Smoothing capacitor 240 and diode bridge 260 constitute a circuit that rectifies and smoothes commercial AC power. The reactor 270 is incorporated in a switching power supply circuit mounted on the power supply substrate 280 and is used for boosting or stepping down.

  A plurality of operation switches 291 that are manually operated by a person are attached to the operation board 290, and parameter settings, address settings, and the like for controlling the air conditioner are performed by operating the switches. The control board 300 is equipped with a control communication circuit that controls the air conditioner according to a remote control signal received from the remote control or detection signals of various sensors attached to the indoor unit or the outdoor unit of the air conditioner.

  As described above, in this embodiment, an electronic component having a low heat-resistant temperature such as the smoothing capacitor 240, the thermistor 250, the diode bridge 260, or the like, or a filter substrate 230 on which an electronic component having a low heat-resistant temperature is similarly mounted, It arrange | positions below from the center of the up-down direction of the face plate 211A. Further, an electronic component having a high heat resistant temperature such as the reactor 270 or a substrate mounted with an electronic component having a high heat resistant temperature such as the power supply board 280, the operation board 290, the control board 300, etc. is placed in the center in the vertical direction of the bottom plate 211A. From above. Note that electronic components such as a capacitor having a low heat resistance included in the control board 20 are arranged on the side close to the control terminal block 222. As a result, even if heat is accumulated inside the casing 210 of the electrical component box 200, the electronic component having a low heat-resistant temperature is not exposed to the accumulated heat, so that the lifetime can be prevented from being shortened. .

  Further, the wiring (a plurality of bundles) connected to the terminal block fixture 220, the filter substrate 230, the smoothing capacitor 240, the thermistor 250, the diode bridge 260, the reactor 270, the power supply substrate 280, the operation substrate 290, and the control substrate 300 are This is performed as shown in FIG.

  401 is a wiring connecting the power supply terminal block 211 and the filter substrate 230, 402 is a wiring connecting the filter substrate 230 and the control substrate 300, 403 is a wiring connecting the filter substrate 230 and the thermistor 250, and 404 is a filter substrate 230 and the reactor 270. 405 is a wiring connecting the filter substrate 230 and the diode bridge 260, 406 is a wiring connecting the smoothing capacitor 240 and the power supply substrate 280, 407 is a wiring connecting the smoothing capacitor 240 and the diode bridge 260, and 408 is a diode. Wiring for connecting the bridge 260 and the reactor 270, 409 for connecting the power supply board 280 and the control board 300, 410 for connecting the control terminal block 222 and the control board 300, 411 for connecting the control board 300 and the operation board 290 Wiring toIn the above, the wirings 401 to 409 are for power supply, and the wirings 410 and 411 are for control communication.

  Thus, in the power supply circuit unit 200A, for example, the power supply wirings 405 to 407 are wired so as to cross each other. However, in the control circuit unit 200B, the wiring for control communication such as the wiring 410 for connecting the control terminal block 222 and the control board 300 and the wiring 411 for connecting the operation board 290 and the control board 300 are the power supply circuit. The power supply lines 401 to 409 of the portion 200A are not adjacent to each other and do not intersect at all. As a result, it is possible to prevent the power supply noise generated in the wiring of the power supply circuit unit 200A from being induced in the wirings 410 and 411 and adversely affect the control communication signal.

100: indoor unit, 101: air inlet, 102: air outlet, 103: heat exchanger, 104: right side plate 200: electrical component box 210: housing, 211: housing body, 211A: bottom plate, 211A1: Upper mounting piece, 211A2: lower mounting piece, 211B: left side plate, 211C: right side plate,
220: terminal block fixture, 221: power supply terminal block, 222: control terminal block, 223: fuse holder 230: filter substrate, 231: coil 240: smoothing capacitor 250: thermistor 260: diode bridge 270: reactor 280: power supply substrate 290: Operation board, 291: Operation switch 300: Control board 310: Wiring insertion plate, 311 and 312: Wiring insertion holes 401 to 411: Wiring

Claims (2)

In the electrical component box mounted vertically on the outer surface of the side plate of the air conditioner indoor unit,
A power supply circuit unit including power circuit components disposed in a vertical posture inside the electrical component box; a control circuit unit disposed side by side with the power circuit unit in a vertical posture inside the electrical component box; is connected to the mounting et been pre Symbol power supply circuit unit and the terminal block fitting in a vertical orientation are arranged side by side and the power supply circuit portion under said control circuit unit, to the terminal base fixture in the interior of the electrical component box A power terminal block, and a control terminal block attached to the terminal block fixture and connected to the control circuit unit;
Among the electronic components mounted on the power supply circuit unit and the control circuit unit, the electronic component having a high heat resistant temperature is disposed above, and the electronic component having a low heat resistant temperature is disposed below,
Electrical component box before Symbol end Kodai, characterized in that it is disposed below the terminal block.
In the electrical component box according to claim 1,
The electrical component box, wherein the control wiring connecting the control terminal block and the control circuit section is wired so as not to intersect the power wiring of the power circuit section.

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