JP2013133948A - Outdoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor unit of an air conditioner such that a ventilation path through which cooling air flowing in from a machine chamber side and cooling an electrical substrate can be smoothly discharged to a heat exchange chamber can be formed without requiring any extra space.SOLUTION: Cooling air flowing in from an opening part of a lower surface plate 20 and cooling many electrical components mounted on an electrical substrate 18 is discharged from a first air hole 20g to a side of a heat exchange chamber 10, and a ventilation passage 17s enclosed by an upper wall 17n and a lower wall 17m and extended up to a second air hole 20h facing a heat exchange chamber 10 side of the lower surface plate 20 from an inflow port 17g opened in an inner peripheral wall 17b is formed below a wiring groove 17f of a substrate holder 17.

Description

  The present invention relates to an outdoor unit of an air conditioner, and more particularly to a ventilation structure inside a substrate holder that supports an electrical substrate provided in an electrical unit.

  The outdoor unit of the air conditioner is divided into a machine room and a heat exchange chamber by a partition plate on the base constituting the bottom surface, and a compressor and an accumulator are arranged in the machine room, while an outdoor heat exchange is performed in the heat exchange room And a blower fan are disposed. Also, an electrical unit is disposed in the upper part of the machine room, and the electrical unit supports a control board on which electrical components are mounted and a heat sink by a substrate holder.

  In the outdoor unit of the air conditioner shown in Patent Document 1, the heat sink provided in the electrical unit forms a horizontal gap and a vertical gap between the bottom surface of the substrate holder that supports the heat sink, and these An air passage having an L-shaped cross section that also serves as a water shielding structure is formed by the gap in the horizontal direction and the gap in the vertical direction from the control board to the heat exchange chamber provided with the blower fan through the heat sink. The cooling air flowing on the control board is guided to the heat sink by the air passage having the L-shaped cross section, so that the cooling effect of the heat sink is improved and the cooling air can be blown to the entire control board of the electrical unit. .

JP-A-2004-125260 (5 pages, FIG. 4)

  Since a gap in the horizontal direction and a gap in the vertical direction are provided between the heat sink and the bottom surface of the substrate holder that supports it, and an air passage having an L-shaped cross section is formed, it is difficult to reduce the size of the electrical unit. There was a problem.

  In order to solve the above problems, the present invention provides a base that constitutes the bottom surface of the main body, an outer cylinder that is attached to the base and constitutes the front and left and right side portions of the main body, and a machine room in which a compressor is disposed in the main body A partition plate partitioned into a heat exchange chamber in which an outdoor heat exchanger and a blower fan are disposed, and an electrical unit fixed on the partition plate so as to straddle the machine room and the heat exchange chamber In the outdoor unit of an air conditioner configured, the electrical unit includes an electrical board, a substrate holder formed in a frame shape that holds the electrical board, side surfaces and a lower surface of the electrical board on the heat exchange chamber side, and A bottom plate having an opening on the machine chamber side, an inner peripheral wall on the substrate side at the periphery of the heat exchange chamber side of the substrate holder, an outer peripheral wall on the heat exchange chamber side, A bottom surface connecting the inner peripheral wall and the outer peripheral wall; A wiring passage that connects the inflow opening that opens to the inner peripheral wall and the ventilation hole that opens to the heat exchange chamber of the lower surface plate is formed below the wiring insertion groove. It has become the composition.

In order to solve the above problems, the present invention provides a base that constitutes the bottom surface of the main body, an outer cylinder that is attached to the base and constitutes the front and left and right side portions of the main body, and a machine room in which a compressor is disposed in the main body. A partition plate partitioned into a heat exchange chamber in which an outdoor heat exchanger and a blower fan are disposed, and an electrical unit fixed on the partition plate so as to straddle the machine room and the heat exchange chamber In the outdoor unit of an air conditioner configured, the electrical unit includes an electrical board, a substrate holder formed in a frame shape that holds the electrical board, side surfaces and a lower surface of the electrical board on the heat exchange chamber side, and A bottom plate having an opening on the machine chamber side, an inner peripheral wall on the substrate side at the periphery of the heat exchange chamber side of the substrate holder, an outer peripheral wall on the heat exchange chamber side, A bottom surface connecting the inner peripheral wall and the outer peripheral wall; A wiring passage that connects the inflow opening that opens to the inner peripheral wall and the ventilation hole that opens to the heat exchange chamber of the lower surface plate is formed below the wiring insertion groove. And
An air conditioner characterized in that a circulation port is provided between an inner peripheral wall of the substrate holder on the heat exchange chamber side and the electrical component substrate so that air on the upper surface side of the electrical component substrate flows through the ventilation passage. Outdoor unit.

  The outdoor unit according to claim 1, wherein a vent hole through which air flows from the lower surface side to the upper surface side of the electric circuit board is provided in the electric circuit board.

  According to the present invention, the ventilation path through which air can flow is formed in the lower part of the wiring insertion groove of the substrate holder, so that the entire electrical board can be cooled by the air flowing in from the machine room side, and the wiring insertion Space can be saved by making effective use of the dead space at the bottom of the groove.

It is an external appearance perspective view which shows the outdoor unit of the air conditioner by this invention. It is a perspective view which shows the internal structure of the outdoor unit of the air conditioner by this invention. It is a perspective view which shows the electrical equipment unit by this invention. It is a disassembled perspective view of an electrical equipment unit. It is a perspective view which shows the board | substrate holder provided in the electrical equipment unit. It is explanatory drawing which shows the flow of the cooling air in an electrical equipment unit. It is principal part explanatory drawing of the electrical equipment unit in other embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

The outdoor unit of the air conditioner according to the present invention includes a base 1 having a pair of left and right legs 1a and an outer trunk covering the base 1, as shown in an external perspective view of FIG. The outer body includes a front panel 2 provided on the front surface of the base 1, a left panel 26 provided on the left side of the base 1, a right panel 3 provided on the right side of the base 1, and the front panel 2 and the right panel 3. And the top plate 4 that covers the upper surface of the left panel 26. The right panel 3 has a handle 8 at the top, and a pipe cover 7 can be detachably attached. An air outlet 5 is formed in the front panel 2, and a fan guard 5 a is attached so as to cover the air outlet 5.

  Next, the internal configuration will be described. As shown in FIG. 2, the base 1 constituting the bottom surface is partitioned into a machine chamber 9 and a heat exchange chamber 10 by a partition plate 8. A compressor 11 and an accumulator 12 are disposed in the machine room 9, and an outdoor heat exchanger 13 and a blower fan 15 formed in an L shape are disposed in the heat exchange chamber 10. The outdoor heat exchanger 13 is composed of a large number of fins arranged in parallel and heat transfer tubes arranged so as to be orthogonal to the fins, and the blower fan 15 is attached to a support base 14 erected on the base 1. It is pivotally supported by a fan motor (not shown). An electrical unit 16 is disposed on the partition plate 8 so as to straddle the machine room 9 and the heat exchange chamber 10. The compressor 11 and the fan motor are driven by the electrical unit 16.

  Next, the electrical unit 16 will be described with reference to FIGS. The electrical unit 16 includes electrical components such as an electrical substrate 18, a substrate holder 17 that supports the electrical substrate 18, a shield plate 19 that covers the substrate holder 17 from above, and a plurality of large-capacitance capacitors mounted on the electrical substrate 18. It comprises a lower plate 20 that covers the lower surface so as to protect and a heat sink 21, and a terminal block holder 23 and a terminal block 24 supported by the terminal block holder 23 are provided at one side lower part of the electrical unit 16. Yes.

  The substrate holder 17 is made of a resin material and has a frame shape. The electrical component substrate 18 supported by the substrate holder 17 has a large number of electrical components mounted on the lower surface, and the upper surface is a pattern surface. The shield plate 19 is made of a thin sheet metal material, and includes a flange 19 a bent downward around the periphery, and includes a locking piece 19 b on the flange 19 a, and by locking the locking piece 19 b to the substrate holder 17. The shield plate 19 is attached to the substrate holder 17. The shield plate 19 prevents dust and water droplets from falling on the pattern surface of the electrical board 18 and prevents leakage of electromagnetic waves generated from the electrical board 18 to the outside of the outdoor unit.

  The heat sink 21 is made of aluminum having excellent heat conductivity, and includes a base body 21a formed in a rectangular shape and a plurality of heat radiation fins 21b erected on the base body 21a. An inverter circuit is provided on the heat exchange chamber 10 side on the lower surface of the electrical board 18, and other control circuits are provided on the machine chamber 9 side. The heat generated from the inverter circuit of the electrical board 18 is transferred to the heat sink 21 and radiated to the surroundings by the heat radiating fins 21b.

  The lower surface plate 20 is made of sheet metal, and is formed by a planar bottom surface portion 20a and an upper surface portion 20b, and a vertical intermediate portion 20c that connects the bottom surface portion 20a and the upper surface portion 20b. An end portion of the upper surface portion 20b is bent to form a rear plate 20d, and both sides of the upper surface portion 20b and the bottom surface portion 20a are bent to form a side plate 20e.

  A first ventilation hole 20g is formed in the intermediate portion 20c of the lower surface plate 20 by a plurality of cuts and raised, and a rectangular passage hole 20f through which the heat dissipating fins 21b of the heat sink 21 pass is formed in the upper surface portion 20b. A second vent hole 20h is formed between the rear plate 20d and the passage hole 20f.

  The terminal block holder 23 is made of sheet metal, and has a terminal block fixing portion 23a which is an inclined surface for fixing the terminal block 24, and a pair of mounting pieces 23b formed on both upper sides of the terminal block fixing portion 23a and having screw holes. It is made up of. Wiring from an indoor unit (not shown) is connected to the electrical board 18 via the terminal block 24.

  Next, the configuration of the substrate holder 17 will be described in detail. As shown in the perspective view of FIG. 5, the substrate holder 17 formed in a frame shape has a double wall structure with an outer peripheral wall 17a surrounding the outer peripheral side and an inner peripheral wall 17b surrounding the inner peripheral side. . A wiring insertion groove 17f through which the wiring 25 is inserted is formed between the outer peripheral wall 17a and the inner peripheral wall 17b on the heat exchange chamber 10 side. A wiring insertion groove 17p is formed between the outer peripheral wall 17a and the inner peripheral wall 17b on the front side of the main body. The wiring 25 disposed in the wiring insertion groove 17 f and the wiring insertion groove 17 p connects the electrical board 18 and a fan motor (not shown) that drives the blower fan 15.

  A pair of terminal block holder fixing portions 17j corresponding to the mounting pieces 23b of the terminal block holder 23 described above are formed on the machine chamber 9 side of the outer peripheral wall 17a, and the terminal block holder fixing portion 17j is shown in the figure. The terminal block holder 23 is fixed to the board holder 17 by inserting a screw into the screw insertion hole not to be screwed into the screw hole of the mounting piece 23b.

  A central beam 17e is installed at the center of the inner peripheral wall 17b, and a first opening 17c in which the electrical board 18 is disposed and a second opening in which the heat sink 21 is disposed inside the inner peripheral wall 17b by the central beam 17e. 17d. A locking piece 17k is formed on the inner peripheral wall 17b corresponding to the first opening 17c, and both side edges of the electrical board 18 are locked to the locking piece 17k, so that the electrical board 18 is mounted on the board holder 17. Has come to be supported. Further, the central beam 17e is provided with a substrate fixing portion 17h having a screw hole, so that the electrical board 18 is fixed to the substrate holder 17 by the substrate fixing portion 17h.

  A ventilation passage 17s, which will be described later, is formed below the wiring insertion groove 17f through which the wiring 25 is inserted from the inner peripheral wall 17b forming the second opening 17d to the outer peripheral wall 17a. The inner peripheral wall 17b has a bottom surface 20a side. A plurality of inflow ports 17g through which air flowing in from the air flows into the ventilation passage 17s are opened. Cooling air that has flowed into the ventilation passage 17s from the inflow port 17g is discharged to the heat exchange chamber 10 side from a second ventilation hole 20h of the lower surface plate 20 described later.

  Next, the heat sink 21 will be described. As shown in the sectional view of the electrical unit 16 in FIG. 6A, the electrical substrate 18 is fixed to the substrate holder 17, and the heat sink 21 is disposed so that the heat radiating fins 21b face downward in the second opening 17d. Is arranged so that the base 21 a is fixed to the substrate holder 17. Further, the lower surface plate 20 is attached to the lower surface of the substrate holder 17.

  Next, the flow of cooling air will be described. The cooling air that has flowed into the opening of the lower surface plate 20 from the machine room 9 cools a large number of electrical components mounted on the electrical board 18 as indicated by arrows in FIG. Part of the cooling air flows along the bottom surface portion 20a of the lower surface plate 20, and, as shown in detail in the portion A of FIG. 6B, from the first vent hole 20g formed in the intermediate portion 20c, the heat exchange chamber 10 To be released to the side.

  As shown in FIG. 6B, the ventilation path 17s of the substrate holder 17 includes an upper wall 17n that forms the bottom surface of the wiring insertion groove 17f, an inner peripheral wall 17b, and a rear plate 20d. The inner peripheral wall 17b is formed with a lower wall 17m extending along the upper wall 17n toward the outer peripheral wall 17a. The lower part of the upper wall 17n on the outer peripheral surface of the substrate holder 17 is open, but is covered with the rear plate 20d of the lower plate 20. The cooling air that has passed between the upper wall 17n and the lower wall 17m is deflected downward. Further, the cooling air whose flow is deflected downward is directed to the second vent hole 20h of the lower surface plate. As described above, since the ventilation passage 17s is formed, it is possible to prevent the entry of water droplets from the inflow port 17g to the electrical board 18 side even if water droplets flow backward from the second ventilation hole 20h.

  A part of the cooling air flowing into the first ventilation hole 20g of the lower surface plate 20 passes through the space formed between the electrical board 18 and the base 21a of the heat sink 21 as shown by the arrow in FIG. It flows into the ventilation passage 17s from 17g. The cooling air flowing in the horizontal direction flowing into the ventilation passage 17s collides with the rear plate 20d of the lower surface plate 20 that covers the outer peripheral side of the substrate holder 17 as described above, and the flow direction is deflected downward, so that the lower wall 17m and the rear wall It passes through the gap formed between the face plate 20d and is discharged from the second vent hole 20h of the bottom plate 20 to the heat exchange chamber 10 side.

  Cooling air is discharged to the heat exchange chamber 10 while cooling the heat dissipating fins 21b from the first vent hole 20g of the lower surface plate 20, and through the vent passage 17s formed in the lower part of the wiring insertion groove 17f of the substrate holder 17. The cooling fins 21b are discharged from the second vent holes 20h of the lower surface plate 20 to the heat exchange chamber 10 to prevent stagnation of the cooling air in the electrical unit 16, thereby preventing the electrical board 18 and the electrical equipment The electrical components mounted on the substrate 18 can be efficiently cooled.

  Further, a space opened by a predetermined length L is provided as a circulation port 26 between the substrate end 18b and the inner peripheral wall 17b. Thereby, the air on the upper surface side of the electrical board 18 merges with the air on the lower surface side of the electrical board 18 and flows into the ventilation passage 17s from the inlet 17g. Air on the upper surface side of the electrical board 18 can be circulated in the vicinity of the board end 18b and discharged from the ventilation passage 17s.

  As shown in FIG. 7A, no space is provided between the substrate end 18b and the inner peripheral wall 17b, and the substrate end 18b is located between the upper wall 17n and the lower wall 17m when viewed from the front side of the main body. It may be arranged. Thereby, the 1st distribution port 26a and the 2nd distribution port 26b can be provided between the upper wall 17n, the electrical equipment board | substrate 18, and the lower wall 17m and the electrical equipment board | substrate 18, respectively. Since the air from the first circulation port 26a and the air from the second circulation port 26b merge in the air passage 17s, the air on the lower surface side having a higher temperature than the air on the upper surface side of the electrical board 18 is Inflow to the upper surface side of the electrical board 18 can be prevented.

  Further, as shown in FIG. 7B, the substrate end 18b may be brought into contact with the inner peripheral wall 17b, and the circulation port 26 may be provided in the vicinity of the substrate end 18b of the electrical board 18.

  By providing the air hole 18a in the electric board 18, a space formed between the electric board 18 and the base 21a of the heat sink 21 from the bottom surface 20a side of the lower plate 20 as shown by an arrow in FIG. A part of the passing cooling air may flow into the upper part of the electrical board 18. The cooling air that has flowed into the upper part of the electrical board 18 passes through the flow port 26 as described above, merges with the cooling air that passes through the lower surface side of the electrical board 18, and flows into the ventilation passage 17s from the inlet 17g.

  With these configurations, the cooling air flowing through the space above the electrical board 18 smoothly flows to the ventilation passage 17s, and the cooling effect can be further enhanced.

  In addition, since the inflow port 17g is provided in the inner peripheral wall 17b at a position facing the cooling air flow direction, the cooling air flowing on the upper surface side or the lower surface side of the electrical board 18 flows smoothly into the ventilation passage 17s. It has become.

DESCRIPTION OF SYMBOLS 1 Base 1a Leg body 2 Front panel 3 Right side panel 4 Top plate 5 Outlet 5a Fan guard 6 Piping cover 7 Handle 8 Partition plate 9 Machine room 10 Heat exchange chamber 11 Compressor 12 Outdoor heat exchanger 14 Outdoor support 15 Air blower Fan 16 Electrical unit 17 Substrate holder 17a Outer peripheral wall 17b Inner peripheral wall 17c First opening 17d Second opening 17e Center beam 17f Wiring insertion groove 17g Inlet 17h Substrate fixing part 17j Terminal block holder fixing part 17k Locking piece 17n Upper wall 17 m Lower wall 17 s Ventilation passage 17 p Wiring insertion groove 18 Electrical board 18 a Ventilation hole 18 b Substrate end 19 Shield plate 19 a Flange 19 b Locking piece 20 Lower surface plate 20 a Bottom surface portion 20 b Upper surface portion 20 c Intermediate portion 20 d Rear surface plate 20 e Side plate 20 f Passing hole 20 g First vent 20h Second vent 21 Sink 21a base 21b radiation fins 23 Terminal block holder 23a terminal block fixing portion 23b attaching piece 24 terminal board 25 wiring 26 flow port 26a first flow port 26b second flow port

Claims (2)

A base that forms the bottom surface of the main body, an outer cylinder that is attached to the base and forms the front and left and right side surfaces of the main body, a machine room in which the compressor is arranged, an outdoor heat exchanger, and a blower fan are arranged In the outdoor unit of the air conditioner, comprising: a partition plate partitioned into a heat exchange chamber; and an electrical unit fixed on the partition plate so as to straddle the machine room and the heat exchange chamber. The electrical unit includes an electrical substrate, a substrate holder formed in a frame shape for holding the electrical substrate, and a side surface and a lower surface of the electrical substrate on the heat exchange chamber side, and includes an opening on the machine chamber side. A bottom plate for connecting the inner peripheral wall on the side of the substrate, the outer peripheral wall on the side of the heat exchange chamber, and the inner peripheral wall and the outer peripheral wall on the peripheral edge of the substrate holder on the heat exchange chamber side A wiring insertion groove consisting of The bottom of the groove, an inlet which opens in said peripheral wall, thereby forming a vent channel connecting the vent hole which is open facing the heat exchange chamber of the lower surface plate,
An air conditioner characterized in that a circulation port is provided between an inner peripheral wall of the substrate holder on the heat exchange chamber side and the electrical component substrate so that air on the upper surface side of the electrical component substrate flows through the ventilation passage. Outdoor unit. The outdoor unit according to claim 1, wherein a vent hole through which air flows from the lower surface side to the upper surface side of the electric circuit board is provided in the electric circuit board.

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