JP2003106560A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner with small and inexpensive electrical equipment mounted on it. SOLUTION: An electrolytic capacitor 2 is arranged near a through-hole 8 for an AC lead wire, and the AC lead wire through-hole 8 is commonly used as an air intake port to an electric power source box 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric component of an air conditioner.

While many electric components for air conditioners are equipped with many heat-generating components for the purpose of driving compressors, fans, etc., the electric components are miniaturized to take up a large area of the heat exchanger. In addition, there is a need for airtightness to improve environmental resistance, and there are conflicting contents in terms of thermal design, and difficult thermal design is required.

[0003]

2. Description of the Related Art A conventional air conditioner includes a diode bridge 1 for rectifying an AC power source, as shown in FIGS.
An electrolytic capacitor 2 that smoothes the rectified current, a power transistor 3 that drives the compressor by the DC voltage smoothed by the electrolytic capacitor 2, an AC lead wire 4 that supplies an AC current to the diode bridge 1, and a diode bridge 1. Electrolytic capacitor 2, power transistor 3 and A
A printed wiring board 5 to which the C lead wire 4 is attached, a radiator plate 6 attached to the diode bridge 1 and the power transistor 3, a power supply box 13 for accommodating the printed wiring board 5 so that the radiator plate 6 is exposed to the outside, and an AC Lead wire 4
In order to draw out the heat from the power supply box 13, the AC lead wire through hole 14 provided in the power supply box 13, the heat exchanger 10, and the fan 11 that ventilates the heat exchanger 10 are configured.

The diode bridge 1, the power transistor 3, and the heat dissipation plate 6 are arranged on the fan 11 side in the power supply box 13, and the exhaust hole 9 is provided near the heat dissipation plate 6 of the power supply box 13.
An air intake hole 15 is provided on the lower surface of the power supply box 13 so that the wind flow 1
6, the inside of the power supply box 13 was cooled.

When outside air enters the power supply box through the AC lead wire through hole 14, moisture and dust adversely affect the electric circuit in the vicinity of the AC lead wire through hole 14 of the power supply box 13. The through-hole 14 is hermetically sealed so that outside air does not enter the power supply box 13.

[0006]

However, in the prior art, the intake of the air into the power supply box 13 is done by the intake hole 15.
As shown in the inside of the product, the heat exchanger 10
Considering the high temperature and the heat generation of the compressor, sufficient cold air could not be taken into the power supply box 13.

Among the electrical components, the electrolytic capacitor 2 is
When the temperature rises, the life is shortened. Therefore, it has been necessary to take measures such as increasing the capacity to suppress heat generation and arranging the electrolytic capacitors 2 apart from each other, which hinders downsizing of electrical components.

Further, increasing the capacity of the electrolytic capacitor 2 is expensive and wasteful.

When the printed wiring board 5 is housed in the power supply box 13 so that the parts face downward as shown in FIG. 4, the electrolytic capacitor 2 which is a heavy part is located near the center of the printed wiring board 5. When the product is dropped, the stress on the printed wiring board 5 becomes large, and the support 17 is required inside the power supply box 13, which is an obstacle to the miniaturization of electrical components.

[0010]

In order to solve the above problems, in the present invention, an electrolytic capacitor is arranged in the vicinity of a through hole for an AC lead wire, and the through hole for an AC lead wire serves as an air intake port into the power supply box. The above problem is solved by sharing.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention promotes cooling in a power supply box by using the AC lead wire through-hole as an air intake port into the power supply box, and the electrolytic capacitor is
By arranging in the vicinity of the C lead wire through hole, the influence of moisture and dust from the outside air on the electric circuit can be eliminated, and
It becomes possible to directly cool the electrolytic capacitor by the outside air. (Embodiment 1) Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in FIGS. 3 and 4 showing the conventional air conditioner are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows an air conditioner of the present invention. The same components as those of the conventional air conditioner are given the same numbers as in the conventional example, and the description thereof will be omitted. The electrolytic capacitor 2 is disposed in the vicinity of the AC lead wire through hole 8 in the power supply box 7, and the AC lead wire through hole 8 is also used as an intake hole for taking in air from the outside air into the power supply box 7.

In the above structure, when the fan 11 rotates, the AC lead wire through hole 8 through the exhaust hole 9 are provided inside the power supply box 7.
A wind flow 12 is produced. At this time, the electrolytic capacitor 2
Is on the most windward side in the wind flow 12, so the electrolytic capacitor 2 is directly cooled by the outside air.

Further, when the outside air is taken into the power supply box 7, the influence of moisture and dust is great in the vicinity of the intake port, but since the outer shell of the electrolytic capacitor 2 is covered with vinyl or the like, there is no influence from moisture and dust.

When the printed wiring board 5 is housed in the power supply box 7 with the parts facing downward as shown in FIG. 1, the electrolytic capacitor 2 which is a heavy component is arranged at the end of the printed wiring board 5. Therefore, if the product falls, the printed wiring board 5
The stress applied to the power supply box 7 is reduced, and it is not necessary to add a support at the center of the power supply box 7.

[0016]

As is apparent from the above embodiments, according to the present invention, the AC lead wire through-hole is shared as an air intake port into the power supply box, thereby promoting cooling of the power supply box, and By arranging the electrolytic capacitor in the vicinity of the through hole for passing the AC lead wire, it is possible to eliminate the influence of moisture and dust due to the outside air on the electric circuit and to cool the electrolytic capacitor directly by the outside air.

When the printed wiring board is housed in the power supply box with the parts facing downward, the electrolytic capacitor, which is a heavy component, is arranged at the end of the printed wiring board.
There is little stress on the printed wiring board when the product falls, etc., and no support is required for the power supply box. As a result, an air conditioner equipped with a small and inexpensive electric component can be realized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same main part.

FIG. 3 is an exploded perspective view of a conventional air conditioner

FIG. 4 is a sectional view of the same main part.

[Explanation of symbols]

1 diode bridge 2 Electrolytic capacitor 3 power transistors 4 AC lead wire 5 printed wiring board 6 heat sink 7 power supply box 8 Through hole for AC lead wire 9 exhaust holes 10 heat exchanger 11 fans

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hirofumi Noma             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Mitsuhisa Nakai             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Keito Uejima             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3L051 BG07 BH01 BJ10                 5E322 BA01 BB03 EA11

Claims (2)

[Claims] 1. A diode bridge for rectifying an AC power source, an electrolytic capacitor for smoothing the rectified current, a power transistor for driving a compressor by a DC voltage smoothed by the electrolytic capacitor, and an AC current for the diode bridge. An AC lead wire to be supplied, a printed wiring board to which the diode bridge, the power transistor, the electrolytic capacitor, and the AC lead wire are attached, a radiator plate attached to the power transistor and the diode bridge, and the radiator plate is external. A power supply box for accommodating the printed wiring board so as to be exposed to the outside, an AC lead wire through hole provided in the power supply box for drawing the AC lead wire outside the power supply box, a heat exchanger, and It is equipped with a fan that ventilates the heat exchanger, In the air conditioner in which the diode bridge and the heat dissipation plate are arranged on the fan side in the power supply box, and an exhaust hole is provided near the heat dissipation plate of the power supply box, the electrolytic capacitor is provided in the power supply box. The A
An air conditioner, which is arranged in the vicinity of a C lead wire through hole, wherein the AC lead wire through hole is also used as an intake hole for taking in outside air into the power supply box. 2. A heat exchanger, a fan for ventilating the heat exchanger, a power supply box accommodating electrical components including a printed wiring board to which an AC lead wire is attached and an electrolytic capacitor, and a power supply thereof. In the box, an AC lead wire through hole for pulling out the AC lead wire to the outside of the power supply box,
The exhaust hole is formed, and the air sucked into the power supply box from the through hole for the AC lead wire is sucked out from the exhaust hole by the negative pressure action generated by the rotation of the fan. The capacitor is the AC
An air conditioner placed near the through hole for the lead wire.