JP4715531B2 - Power box for air conditioner and air conditioner - Google Patents

Description

  The present invention relates to an electrical component of an air conditioner.

  In a conventional air conditioner, an electrolytic capacitor is arranged in the vicinity of the AC lead wire through-hole, and the AC lead wire through-hole is used as an air intake into the power supply box to promote cooling in the power supply box. In addition, the electrolytic capacitor is directly cooled by the outside air by disposing the electrolytic capacitor in the vicinity of the AC lead wire through hole. FIG. 6 shows a conventional air conditioner. The electrolytic capacitor 101 is disposed in the power supply box 102 in the vicinity of the AC lead wire through hole 103, and the AC lead wire through hole 103 is shared as an intake hole for taking air into the power supply box 102 from the outside air.

In the above configuration, when a fan (not shown) rotates, an air flow 105 is generated from the AC lead wire through hole 103 to the exhaust hole 104 inside the power supply box 102. At this time, since the electrolytic capacitor 101 is at the most upwind side in the wind flow 105, the electrolytic capacitor 101 is directly cooled by the outside air.
JP 2003-106560 A

  However, the above-described conventional technology has the following problems.

  That is, the largest heating element among electrical components is often a power module and a diode bridge, and in order to reduce the amount of heat generation, it is necessary to increase the capacity, which is very expensive in terms of cost. Therefore, efficient cooling of the power module and the diode bridge has been demanded.

  In addition, due to the configuration of the air conditioner outdoor unit, when installing a power supply box including a printed wiring board in the vertical direction, rainwater, etc., is exposed from the opening for exposing the heat sink to the blower circuit side to the electrical component storage unit side. There was a risk of intrusion, and rainwater waterproofing or safe drainage of invaded water was required.

In order to solve the above-mentioned conventional problems and obtain efficient cooling of electrical components, a power supply box for an air conditioner of the present invention includes a diode bridge that rectifies an AC power supply, an electrolytic capacitor that smoothes the rectified current, and an electrolytic A power module that drives the compressor with a DC voltage smoothed by a capacitor, an AC lead wire that supplies an AC current to the diode bridge, a diode bridge, a power module, an electrolytic capacitor, and a printed wiring to which the AC lead wire is attached. Board, diode bridge, heat sink attached to the power module, and power supply box that stores and arranges the printed wiring board in a vertical direction so that the heat sink is exposed to the ventilation circuit side, of the four sides of the printed wiring board the three sides of the upper side and both sides side edges joining without a portion facing and spacing of the power supply box, outside the left side Attached at a distance from the power supply box so as to form an opening with respect to, shew outlet to the surface of the ventilation circuit side opposite to the gap, facing the extended further outlet three sides of the exhaust port faces By providing a wall, a hexahedron is formed, and the surface of the exhaust port and the other surface adjacent to the surface of the exhaust port are opened .

  In the present invention, when the heat sink is housed in the power supply box, ribs are provided in parallel to the fins provided on the heat sink on both sides of the opening provided to expose the heat sink to the ventilation circuit side. It is.

  Further, the present invention has two ribs on the surface that is not on the side of the ventilation circuit, below the opening provided to expose the heat radiation plate on the side of the ventilation circuit when the heat radiation plate is housed in the power supply box. The two ribs are provided so that the gap is wider than the width of the opening and the gap becomes narrower as it goes downward.

Of the four sides of the printed wiring board, the upper side and the three sides on both sides are joined to the opposite parts of the power supply box without any gap, and the remaining one side is spaced from the power supply box so as to form an opening to the outside air. By providing an exhaust port on the surface on the side of the ventilation circuit facing the intake port, the exhaust port side becomes negative pressure when the outdoor fan rotates, so that the outside air is directly supplied from the intake port to the power supply box. The diode bridge and power module, which are main heating elements, can be directly cooled by this outside air.

  In addition, a hexahedron is formed by extending the three sides of the exhaust port and providing a wall on the surface facing the exhaust port, and the surface of the exhaust port and the other surface adjacent to the surface of the exhaust port are opened. Thus, by forming the cover of the exhaust port, it is possible to reduce the intrusion of rainwater from the exhaust port to the electrical component storage side.

  Further, when the heat radiating plate is housed in a power supply box, ribs are provided on both side surfaces of an opening provided to expose the heat radiating plate on the ventilation circuit side in parallel with fins provided on the heat radiating plate. By this, the boundary between the opening provided to expose the heat sink of the power supply box and the heat sink can be shielded from the rainwater entrance line, and the intrusion of rainwater into the electrical component storage side Can be reduced.

  Further, when the heat sink is housed in the power supply box, two ribs are provided on the surface of the power supply box on the electrical component storage side below the opening provided to expose the heat sink on the ventilation circuit side. The heat sink of the power supply box is exposed by providing the two ribs so that the gap between the upper part is wider than the width dimension of the opening and the gap becomes narrower as it goes downward. When rainwater that has entered from the boundary between the opening provided for this purpose and the heat sink flows downward, the rainwater can be received by the rib and guided to an appropriate position.

A first invention is a diode bridge for rectifying an AC power source, an electrolytic capacitor for smoothing the rectified current, a power module for driving a compressor by a DC voltage smoothed by the electrolytic capacitor, and an AC current in the diode bridge. An AC lead wire, the diode bridge, the power module, the electrolytic capacitor, a printed wiring board to which the AC lead wire is attached, the diode bridge, and a heat sink attached to the power module, Regarding the power supply box in which the printed wiring board is arranged in a vertical direction so that a heat radiating plate is exposed to the ventilation circuit side, the upper side and the three sides on both sides of the four sides of the printed wiring board are connected to the power supply box. It joined without a portion facing the gap, to form an opening to remain one side against the outside air The mounting from the power supply box with a spacing, offering an exhaust port on the surface of the air circuit side facing the gap, providing a wall surface facing the extended further outlet three sides of the exhaust port as Thus, a hexahedron is formed, and the surface of the exhaust port and the other surface adjacent to the surface of the exhaust port are opened .

In a second aspect of the invention , when the heat radiating plate is housed in a power supply box, parallel to the fins provided on the heat radiating plate on both side surfaces of the opening provided to expose the heat radiating plate to the ventilation circuit side. Ribs are provided.

According to a third aspect of the present invention , when the radiator plate is housed in a power supply box, two ribs are provided on a surface not on the ventilation circuit side below an opening provided for exposing the radiator plate to the ventilation circuit side. And the two ribs are provided so that the distance between the upper portions is wider than the width of the opening and the distance decreases toward the bottom.

4th invention mounts the said power supply box in an air conditioner.

(Embodiment 1)
FIG. 1 is a longitudinal side view of a power box for an air conditioner according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of a main part of the power box for an air conditioner according to Embodiment 1 of the present invention. 1 and 2, a diode bridge 1 that rectifies an AC power source, an electrolytic capacitor 2 that smoothes the rectified current, a power module 3 that drives a compressor with a DC voltage smoothed by the electrolytic capacitor 2, and a diode The bridge 1, the power module 3, the printed wiring board 4 to which the electrolytic capacitor 2 is attached, the diode bridge 1, and the heat sink 5 attached to the power module 3 are connected to the power supply box 6 and the heat sink 5 to the ventilation circuit 8 side. It is arranged so as to be exposed. Of the four sides of the printed wiring board 4, three sides are joined to the opposite parts of the power supply box without any gaps, and the remaining one side is attached with a gap from the power supply box 6 to form the outside air inlet port 7, while the outside air An exhaust port 9 is provided on the surface on the side of the ventilation circuit 8 facing the suction port 7.

  When the fan 10 rotates in this configuration, the upstream side 11 of the fan 10 becomes negative pressure, so that an air flow 12 from the outside air intake port 7 through the printed wiring board 4 and the power supply box 6 to the exhaust port 9 is generated. . At this time, the diode bridge 1 and the power module 3 disposed in the space between the printed wiring board 4 and the power supply box 6 are directly cooled by the outside air. Although the heat sink 5 is attached to the diode bridge 1 and the power module 3, the heat sink 5 is exposed to the ventilation circuit 8, and the air flowing through the ventilation circuit 8 has passed through the heat exchanger 19 (FIG. 5). Later, it receives heat from the heat exchanger and becomes hot compared to the outside air. Therefore, by applying the external air directly to the diode bridge 1 and the power module 3 in this configuration, more efficient cooling becomes possible, the capacity of the diode bridge 1 and the power module 3 is suppressed, cost reduction, and component reliability are achieved. Improvement can be achieved.

  FIG. 3 is a perspective view of a main part of the power box for the air conditioner according to Embodiment 1 of the present invention. 1 and 3, a hexahedron 13 is formed by extending three sides of the exhaust port 9 and providing a wall on the surface facing the exhaust port 9, and the surface of the exhaust port 9 of the hexahedron 13 and the exhaust port The other surface 14 adjacent to the surface 9 is open so as to cover the exhaust port 9. Thereby, the intrusion of rainwater from the exhaust port 9 to the electrical component storage side can be reduced, and the destruction of the electric circuit and the ignition due to the short-circuiting of the electric circuit due to the intrusion of the rainwater can be avoided.

  FIG. 4 is a perspective view of a main part of the air conditioner power supply box according to Embodiment 1 of the present invention.

  1, 3, and 4, when the heat radiating plate 5 is housed in the power supply box 6, the heat radiating plate 5 is attached to both sides of the opening 15 provided to expose the heat radiating plate 5 to the ventilation circuit 8 side. A set of first ribs 17 is provided in parallel to the provided fins 16. As a result, the boundary between the heat sink 5 and the opening 15 provided to expose the heat sink 5 of the power supply box 6 can be shielded from the rainwater entry line, and rainwater enters the electrical component storage side. The electric circuit can be prevented from being broken or ignited due to a short circuit caused by the intrusion of rainwater.

Further, when the heat sink 5 is housed in the power supply box 6, two are provided on the surface of the power supply box 6 on the electrical component storage side below the opening 15 provided to expose the heat sink 5 to the ventilation circuit 8 side. Two second ribs 18 are provided so that the distance between the upper portions of the ribs 18 is wider than the width dimension of the opening 15 and the distance between the ribs 18 decreases toward the bottom. As a result, when rainwater that has entered from the boundary between the opening 15 provided to expose the heat sink 5 of the power supply box 6 and the heat sink 5 flows downward, between the two second ribs 18. You can catch rainwater and guide it to an appropriate position.

  FIG. 5 is an exploded perspective view of the air conditioner according to Embodiment 1 of the present invention.

  As described above, the power supply box for an air conditioner and the air conditioner according to the present invention can efficiently cool the power module and the diode bridge, and include a printed wiring board due to the configuration of the air conditioner outdoor unit. When installing the power supply box in the vertical direction, rainwater etc. is prevented from entering the electrical equipment storage section from the opening for exposing the heat sink to the blower circuit side, and rainwater is waterproof or safe Since it can be discharged, it can be applied not only to air conditioners but also to refrigeration cycle applied equipment, that is, dehumidifiers and dryers.

1 is a longitudinal side view of a power supply box for an air conditioner according to Embodiment 1 of the present invention. The principal part perspective view of the power supply box for air conditioners in Embodiment 1 of this invention The principal part perspective view of the power supply box for air conditioners in Embodiment 1 of this invention The principal part perspective view of the power supply box for air conditioners in Embodiment 1 of this invention 1 is an exploded perspective view of an air conditioner according to Embodiment 1 of the present invention. Cross section of the main part of a conventional air conditioner

DESCRIPTION OF SYMBOLS 1 Diode bridge 2 Electrolytic capacitor 3 Power module 4 Printed wiring board 5 Heat sink 6 Power supply box 7 Outside air intake port 9 Exhaust port 10 Fan 12 Airflow 17 First rib 18 Second rib 19 Heat exchanger

Claims (4)

An outdoor heat exchanger, a diode bridge for rectifying an AC power source, and an electrolytic capacitor for smoothing the rectified current, provided to an outdoor unit of an air conditioner including a ventilation circuit that ventilates the outdoor heat exchanger by a fan; A power module that drives a compressor with a DC voltage smoothed by the electrolytic capacitor, an AC lead wire that supplies an AC current to the diode bridge, the diode bridge, the power module, the electrolytic capacitor, and the AC A printed wiring board to which lead wires are attached, the diode bridge, a heat radiating board attached to the power module, and the printed wiring board is arranged vertically and stored so that the heat radiating board is exposed to the ventilation circuit side. It relates to a power supply box to the upper side and both sides of the four sides of the printed circuit board The three sides of the sides are joined without a portion facing the gap of the power supply box, mounted at a distance from the power supply box so as to form an opening to remain one side against the outside air, facing the distance the air A hexahedron is formed by providing an exhaust port on the surface on the circuit side, and extending the three sides of the exhaust port, and further providing a wall on the surface facing the exhaust port, the exhaust port surface, and the exhaust port surface Air conditioner power supply box with the other side open . When the heat sink is housed in a power supply box, ribs are provided on both side surfaces of an opening provided to expose the heat sink on the ventilation circuit side in parallel with fins provided on the heat sink. Item 2. A power supply box for an air conditioner according to Item 1. When the heat sink is housed in a power supply box, it has two ribs on the surface that is not on the side of the ventilation circuit, below the opening provided to expose the heat dissipation plate on the side of the ventilation circuit. The power supply box for an air conditioner according to claim 1, wherein the two ribs are provided so that the interval is wider than the width dimension of the opening and the interval becomes narrower as it goes downward. An air conditioner equipped with the air conditioner power supply box according to claim 1.

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