JP6844131B2 - Outdoor unit of air conditioner - Google Patents

Description

The present invention relates to an outdoor unit of an air conditioner.

Some outdoor units of air conditioners have a blower facing upward. This outdoor unit has a horizontally long rectangular parallelepiped housing, and the inside of the housing is divided into a machine room having a heat exchanger and a compressor and a blower room having a blower. The machine room is arranged at the lower part of the housing, the blower room is arranged at the upper part of the machine room, and the air outlet of the blower is provided on the upper surface of the housing.

When the housing is viewed from the front, the left half space of the machine room is the left machine room, the right half space is the right machine room, the left half space of the blower room is the left blower room, and the right half space of the blower room is the right. When the blower room is used, the first heat exchanger is arranged in the left machine room, the second heat exchanger is arranged in the right machine room, the first blower is arranged in the left blower room, and the right blower is arranged. A second blower is placed in the room.

Both the first heat exchanger and the second heat exchanger are formed in a U shape, and are arranged on the bottom plate of the housing so that their open ends face each other. Compressors are installed in each of the left machine room and the right machine room so as to be surrounded by the first heat exchanger and the second heat exchanger. Further, a suction port is provided on the side surface of the outdoor unit facing each of the first heat exchanger and the second heat exchanger.

On the upper surface of the housing, the air outlet of the first blower and the air outlet of the second blower are arranged symmetrically with respect to the center in the left-right direction of the housing, respectively. Further, the air outlet of the first blower is arranged in the center of the upper surface on the left blower chamber side, and the air outlet of the second blower chamber is arranged in the center of the upper surface on the right blower chamber side.

The left front pillar is located on the front side of the left machine room, and the right front pillar is located on the front side of the right machine room. Each front pillar is made by press-molding a steel plate and is formed in a vertically long rectangular shape. There is an opening between the left front pillar and the right front pillar for maintenance of the outdoor unit. A service panel is attached to this opening. An electrical component box is arranged on the back surface of this service panel. In this electrical component box, the surface facing the service panel is the front side, the surface opposite to the service panel is the back side, the side close to the first heat exchanger is the left side, and the side close to the second heat exchanger is the right side.

The electrical component box consists of a rectangular parallelepiped box whose front surface is approximately the same size as the service panel, and is screwed to each of the left front pillar and the right front pillar. In this electrical component box, there are an inverter board for the compressor that controls the compressor, an inverter board for the fan motor that controls the motor of the blower, a smoothing circuit board that smoothes the current rectified by the rectifier, and an outdoor unit and an indoor unit. It houses various electronic components such as a control board for control.

Of the electronic components housed in the electrical component box, the electronic components mounted on the compressor inverter board and fan motor inverter board generate a large amount of heat, so each electronic component is radiated and cooled by a heat sink. I had to do it. This heat sink protrudes from the back side of the electrical component box and is arranged in the internal space of the outdoor unit. A substrate on which electronic components that generate a large amount of heat, such as an inverter board for a compressor and an inverter board for a fan motor, are mounted is hereinafter referred to as a heat generating board. Further, a board on which an electronic component having a small amount of heat generation such as a smoothing circuit board is mounted is hereinafter referred to as a control board.

A heat sink is disclosed in which two electronic components that generate a large amount of heat are brought into contact with each other to dissipate heat. (Refer to Patent Document 1) By applying this technology, an inverter board for a compressor, which is a heat generating board, and an inverter board for a fan motor are combined, and an electronic component that generates a large amount of heat mounted on each inverter board is used as a heat sink. It is conceivable to bring it into contact with the inverter to cool it.

Japanese Unexamined Patent Publication No. 2005-106309

When one heat-generating board and one control board are provided in the electrical component box, the heat-generating board is arranged at one end of the left and right ends of the electrical component box, and is provided in the electrical component box toward the back side of the outdoor unit. A protruding heat sink is placed at the edge of the electrical component box. Further, since the outdoor unit has a suction port on the side surface and an air outlet on the upper surface, the air sucked into the outdoor unit flows diagonally upward from the suction port. Therefore, since the sucked air flows upward as it is after hitting the heat sink arranged at the end of the electrical component box, it does not flow to the back side of the heat sink, and there is a problem that the heat dissipation efficiency of the heat sink deteriorates. It was. In addition, the outdoor unit of the air conditioner may be provided with two compressors and two blowers. In this case, the electrical component box is provided with two inverter boards for the compressor and two inverter boards for the fan motor, which are heat generating boards. There is something that can be done. Further, two smoothing circuit boards, which are one of the control boards, are also provided in the same manner. Therefore, when the heat generating boards on which the electronic components with a large amount of heat are mounted and the control boards on which the electronic components with a small amount of heat are mounted are arranged alternately, the control boards arranged between the heat generating boards on both sides are the heat generating boards on both sides. There is a problem that the electronic components mounted on the control board are easily deteriorated or broken because they are easily affected by the heat generated in the control board. Further, when the exhaust port for exhausting air from the electrical component box is adjacent to the heat sink, there is a problem that the air exhausted from the exhaust port passes by the heat sink side to give heat to the heat sink and hinder heat dissipation.

Therefore, an object of the present invention is to provide an outdoor unit of an air conditioner in which a heat sink provided in an electrical component box can efficiently dissipate heat and the influence of heat between substrates arranged inside the electrical component box is reduced. And.

In order to solve the above-mentioned problems and achieve the purpose, a box-shaped housing having a front surface, a back surface, an upper surface surface, a right side surface, and a left side surface is provided with suction ports on at least one side surface and the back surface of the right side surface and the left side surface. An air outlet is provided on the upper surface of the housing, a heat exchanger is arranged in the housing at a position facing the suction port, and a blower fan is arranged below the air outlet. An electrical component box having a front surface and a back surface is housed, and the electrical component box is provided with an intake port for taking in air into the electrical component box at a position closer to one side of the housing in the lower part of the back surface of the electrical component box. , The electrical component box is provided with an exhaust port for discharging air from the electrical component box at a position closer to one side of the housing in the upper part of the back of the electrical component box, and the intake port and the exhaust port of the electrical component box are the electrical components. There are two on the back of the box, one of the two intake ports is located near one side of the housing on the back of the electrical equipment box, and the other is located near the other side of the housing on the back of the electrical equipment box. One of the two exhaust ports is located closer to one side of the housing on the back of the electrical component box, and the other is located closer to the other end of the housing on the back of the electrical component box. At least one control board on which electronic parts that generate a small amount of heat are mounted is provided inside, and at least one heat-generating board on which electronic parts that generate a large amount of heat are mounted is provided in the electrical component box to cool the heat-generating board. the heat sink is provided on the back of the electrical component box, air heatsink comprises a heat dissipating fins formed of a plurality of convex portions, and between the two intake ports, the Ru said radiation fins are arranged between the two exhaust ports In the outdoor unit of the harmonizer, the control board is arranged in the ventilation path connecting the intake port and the exhaust port, and the heat generating board is arranged at a position adjacent to the control board and away from one side of the housing from the control board. The heat sink is arranged so as to be in contact with the heat sink.

Further, the present invention is characterized in that the convex portions are parallel to each other and are formed from the upper part to the lower part of the back surface of the electrical component box.

Further, in the present invention, two blowers are provided, a first control board and a second control board are provided as control boards, a first heat generation board and a second heat generation board are provided as heat generation boards, and an intake port and an exhaust port are provided. The first control board, the first heat generating board, the second heat generating board, and the second control board are arranged in this order from one side surface side to the other side surface side of the housing in the ventilation path connecting the two.

In the outdoor unit of the air conditioner of the present invention as described above, the heat sink is arranged on the back surface of the electrical component box at a position away from the suction port located near one side of the outdoor unit, so that the heat sink is sucked into the outdoor unit. The air flows to the back side of the heat sink via the back surface of the electrical component box, and the heat generating board can be efficiently dissipated. At the same time, the control board arranged inside the electrical component box is not sandwiched between the heat generating boards, so that heat is generated. The influence of heat between the board and the control board is reduced.

It is a front side external perspective view of the outdoor unit of the air conditioner which concerns on embodiment of this invention. It is a rear side external perspective view of the outdoor unit of the above-mentioned air conditioner. It is sectional drawing of the line AA of FIG. It is a front side external perspective view of the state where the front pillar is attached to the base panel, the front pillar and the side panel. It is a front view which showed the inside of the electrical component box of the said air conditioner. It is a rear view of the rear side appearance of the electrical component box of the air conditioner.

Hereinafter, embodiments of the outdoor unit of the air conditioner according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. Further, the vertical direction, the horizontal direction, and the front-rear direction of the outdoor unit of the present embodiment will be described based on the coordinate axes shown in FIG.

As shown in FIGS. 1 to 4, the outdoor unit 1 of this air conditioner has a rectangular housing 2 that is horizontally long in the left-right direction (horizontal direction in FIG. 1), and the inside of the housing 2 exchanges heat. It is divided into a machine room MC having a vessel 3 and a compressor (not shown), and a blower room FC having a blower 4. In this embodiment, the machine room MC is arranged at the lower part in the housing 2, and the blower room FC is arranged above the machine room MC.

In FIG. 1, when the housing 2 is viewed from the front, the space on the left half of the machine room MC is the left machine room ML, the space on the right half is the right machine room MR, and the space on the left half of the blower room FC is the left blower room FL. The space on the right half of the blower room FC is used as the right blower room FR, the first heat exchanger 3L is arranged in the left machine room ML of the housing 2, and the second heat exchanger 3R is arranged in the right machine room MR. ing.

Further, the first blower 4L is arranged in the left blower room FL, the second blower 4R is arranged in the right blower room FR, and the first air of the first blower 4L is arranged on the upper surface of the housing 2. An outlet 11L and a second air outlet 11R of the second blower 4R are provided, respectively.

As a basic structure, the housing 2 has a rectangular base panel 20 installed on the installation surface, a left side panel 30L erected on the left end of the base panel 20, and a right end of the base panel 20. The right side panel 30R to be erected, the front beam 40F (see FIG. 4) horizontally laid between the front end of the left side panel 30L and the front end of the right side panel 30R, and the rear end of the left side panel 30L. It is equipped with a rear beam 40R (see FIG. 4) that is horizontally hung from the rear end of the right side panel 30R.

As shown in FIG. 4, the base panel 20 is formed by pressing or welding a steel plate, and is formed in a horizontally long rectangular shape. On the base panel 20, a locking portion (not shown) to which a panel or the like is screwed is erected on the peripheral edge thereof substantially vertically over the entire circumference.

The base panel 20 is formed with front legs 22 and rear legs 23 when the outdoor unit 1 is installed on a surface to be installed (not shown). The front leg 22 is bent at a substantially right angle from the front end side (front side in FIG. 4) of the base panel 20 toward the lower side, and is formed continuously over the left and right sides. The rear leg 23 is bent at a substantially right angle from the rear end side (back side in FIG. 4) of the base panel 20 toward the lower side, and is formed continuously at both the left and right ends.

Also referring to FIG. 3, the heat exchanger 3 includes two heat exchanger units, a first heat exchanger 3L and a second heat exchanger 3R. The first heat exchanger 3L includes a left front portion 31L arranged along the left front end of the base panel 20, a left side surface portion 32L arranged along the left end of the base panel 20, and a left rear end of the base panel 20. It has a left rear surface portion 33L arranged along the above surface, and is formed in a U shape in a top view (direction of the paper surface in FIG. 3).

The first heat exchanger 3L includes a first end plate 34L attached to the end of the left front surface portion 31L (hereinafter, also referred to as a front end portion 34L) and a second end plate attached to the end portion of the left rear surface portion 33L. It is fixed to the base panel 20 via an end plate 35L (hereinafter, also referred to as a rear end portion 35L).

The second heat exchanger 3R includes a right front portion 31R arranged along the right front end of the base panel 20, a right surface portion 32R arranged along the right end of the base panel 20, and a right rear end of the base panel 20. It has a right rear surface portion 33R arranged along the above surface, and is formed in a U shape in a top view (direction of the paper surface in FIG. 3).

The second heat exchanger 3R includes a third end plate 34R attached to the end of the right front surface portion 31R (hereinafter, also referred to as a front end portion 34R) and a fourth end plate attached to the end portion of the right rear surface portion 33R. It is fixed to the base panel 20 via an end plate 35R (hereinafter, also referred to as a rear end portion 35R).

With reference to FIGS. 1 to 4 again, the left side panel 30L and the right side panel 30R have the same basic shape and are arranged symmetrically. Therefore, in the following, the left side panel 30L The configuration of is described.

The left side panel 30L is made by press-molding a metal plate, and its width is substantially the same as the length of the left end of the base panel 20, and is formed in a vertically long rectangular shape from the lower end to the upper end of the housing 2. There is.

The left side panel 30L has a pair of support columns 31 and 32 that engage with the corners of the base panel 20, and a grill portion that protects the left side surface 32L of the first heat exchanger 3L between the support columns 31 and 32. 33 and a panel portion 34 that closes the left side surface of the blower chamber FC in FIG. 2 are formed. The lower ends of the support columns 31 and 32 protrude from the lower ends of the left side panel 30L in order to engage with the side surfaces of the front legs 22 and the rear legs 23 of the base panel 20.

The grill portion 33 has a portion extending from the lower end to the upper end of the first heat exchanger 3L opened in a grid pattern, and the first heat exchanger 3L is exposed to the outside through the grill portion 33. The panel portion 34 is a panel surface that closes the right side surface of the blower chamber FC.

With reference to FIG. 4, the front beam 40F is made of an angle steel material having an L-shaped cross section in this example, and is horizontally hung between the support column 31 of the left side panel 30L and the support column 31 of the right side panel 30R. Has been done. One end of the front beam 40F is screwed to the support column 31 on the front end side of the left side panel 30L, and the other end is screwed to the support column 31 on the front end side of the right side panel 30R.

The rear beam 40R is also made of an angle steel material having an L-shaped cross section, and is horizontally hung between the support column 32 of the side panel 30L and the support column 32 of the right side panel 30R. One end of the rear beam 40R is screwed to the support column 32 on the rear end side of the left side panel 30L, and the other end is screwed to the support column 32 on the rear end side of the right side panel 30R.

In this embodiment, the front beam 40F and the rear beam 40R are arranged along the boundary between the machine room MC and the blower room FC of the housing 2, and the front beam 40F and the rear beam 40R are parallel to each other on the same plane. Moreover, it is arranged so as to be parallel to the base panel 20.

The front beam 40F and the rear beam 40R are provided with a first motor bracket 41L for mounting the first blower 4L and a second motor bracket 41R for mounting the second blower 4R. In this embodiment, the first motor bracket 41L is arranged in the left blower chamber FL, and the second motor bracket 41R is arranged in the right blower chamber FR.

Since both the first motor bracket 41L and the second motor bracket 41R have the same configuration, one of the first motor brackets 41L will be described below. The first motor bracket 41L has a pair of beam members 411 and 411 that are laid in parallel between the front beam 40F and the rear beam 40R, and both ends of the beam members 411 and 411 are relative to the front beam 40F and the rear beam 40R. Each is fixed with screws.

The fan motor M of the blower 4L is mounted on the first motor bracket 41L, and a blower fan (not shown) is attached to the rotating shaft OL of the fan motor M. Similarly, the fan motor M of the blower 4R is mounted on the second motor bracket 41R, and a blower fan (not shown) is attached to the rotating shaft OR of the fan motor M.

A cylindrical bell mouth BM (BML, BMR) (see FIG. 5) is provided on the outer periphery of each blower fan 4 (4L, 4R). In this embodiment, the air outlets 11 (11L, 11R) correspond to the inner diameter of the bell mouth BM (φ1 in FIG. 5). In FIG. 5, the bell mouth BM represents the position of its outer line by a alternate long and short dash line.

In this embodiment, in the bell mouth BM, the opening diameter of the air outlet 11 gradually decreases from the lower end in the axial direction (lower end in FIG. 5 (b)) to the upper end (upper end in FIG. 5 (b)). Is formed in. According to this, when the blower 4 is driven, the air that has passed through the heat exchangers 3L and 3R from the outer surface of the housing 2 and has been heat-exchanged passes through the blower 4 from the air outlet 11 to the outside of the housing 2. Is discharged to.

By the way, when two blowers 4L and 4R are mounted on the front beam 40F and the rear beam 40R, the bending moment increases from both ends toward the center of the front beam 40F and the rear beam 40R, and the front beam 40F and the rear beam 40R are distorted. Bending may occur.

Therefore, in order to increase the mechanical strength of the front beam 40F and the rear beam 40R, the housing 2 is provided with the front pillar 50 and the rear pillar 60. The front pillar 50 includes a left front pillar 50L arranged on the front side of the left machine room ML and a right front pillar 50R arranged on the front side of the right machine room MR.

Next, the configurations of the front pillars 50L and 50R will be described. Since the basic configurations of the front pillars 50L and 50R are the same and have a symmetrical shape, one of the left front pillars 50L will be described.

The left front pillar 50L is made of, for example, one steel plate pressed and molded, and is formed in a vertically long rectangular shape. The left front pillar 50L includes a grill portion 51 that protects the left front portion 31L of the first heat exchanger 3L. In this embodiment, the grill portion 51 is formed in a grid pattern in which eight through holes cut out in a square shape are provided.

At the left end of the left front pillar 50L, a first flange portion 52 for screwing the left front pillar 50L to the support column portion 31 of the left side panel 30L is provided. At the right end of the left front pillar 50L, a second flange portion 53 to which the service panels 70A and 70B and the electrical component box 80, which will be described later, are attached is provided. A third flange portion 54 for screwing to the front beam 40F is further provided at the upper end of the left front pillar 50L.

The lower end side of the left front pillar 50L is screwed to the base panel 20, the upper end side is screwed to the front beam 40F via the third flange portion 54, and the first flange portion 52 is further screwed to the strut portion 31 of the left side panel 40L. It is screwed in a state of contact.

As shown in FIG. 2, the rear pillar 60 is made of, for example, a steel plate pressed and molded, and is formed in a vertically long rectangular shape in which the lower end is fixed to the base panel 20 and the upper end is fixed to the rear beam 40R.

The rear pillar 60 includes a panel main body 61 that closes the back opening 2B existing between the first heat exchanger 3L and the second heat exchanger 3R in the center. A first flange portion 62 screwed to the end plate 35L of the first heat exchanger 3L is formed at the left end of the rear pillar 60 in FIG. 2, and a second heat exchange is formed at the right end of the rear pillar 60 in FIG. A second flange portion 63 that is screwed to the end plate 35R of the vessel 3R is formed. The upper end of the rear pillar 60 is screwed to the rear beam 40R.

The lower end of the rear pillar 60 is screwed to the base panel 20, the upper end is screwed to the rear beam 40R, the first flange portion 62 is screwed to the end plate 35L of the first heat exchanger 3L, and the second flange portion 63 is screwed to the end plate 35R of the second heat exchanger 3R. As a result, as shown in FIG. 2, the rear opening 2B existing between the first heat exchanger 3L and the second heat exchanger 3R can be closed by the rear pillar 60.

According to this, the two front pillars 50L and 50R are screwed between the base panel 20 and the front beam 40F, and the rear pillar 60 is locked between the base panel 20 and the rear beam 40R. The mechanical strength is increased, and deformation and bending of the housing 2 can be prevented.

A protective grill (not shown) that protects the back portions 33L and 33R of the first heat exchanger and the second heat exchangers 3L and 3R is screwed between the rear pillar 60 and the left and right side panels 50L and 50R. Although it has been stopped, the description is omitted because no particular description is required in the present invention.

With reference to FIGS. 1 to 4 again, the front opening 2A (see FIG. 4) for maintenance is provided between the left front pillar 50L and the right front pillar 50R of the housing 2. Therefore, the service panel 70 is attached to the front opening 2A.

The service panel 70 is composed of two panel materials having an upper service panel 70A that closes the upper side of the front opening 2A and a lower service panel 70B that closes the lower side of the front opening 2A.

The upper service panel 70A and the lower service panel 70B are made of a substantially square metal panel. The left end (left end in FIG. 1) of the upper service panel 70A and the lower service panel 70B is screwed to the second flange portion 53 of the left front pillar 50L. The right ends (right ends in FIG. 1) of the upper service panel 70A and the lower service panel 70B are screwed to the second flange portion 53 of the right front pillar 50R.

In this embodiment, the lower left corner of the lower service panel 70B is cut in an L shape, and a conduit panel 74 for connecting a conduit pipe (not shown) is fitted in the notch 73.

As shown in FIG. 3, the electrical component box 80 is installed on the back surface of the upper service panel 70A (the surface facing the inside of the housing 2). The electrical component box 80 is formed of a rectangular parallelepiped box having substantially the same size as the upper service panel 70A, and is screwed to the second flange portions 53 and 53 of the left and right front pillars 50L and 50R.

The front panel 90F is arranged on the front side (front side in FIG. 1) of the blower room FC of the housing 2, and the rear panel 90R is arranged on the back side (front side in FIG. 2) of the blower room FC. ing. Both the front panel 90F and the rear panel 90R are horizontally long rectangular metal panels that cover the front side and the back side of the blower chamber FC, and are screwed to the side panels 30L and 30R, respectively.

A top panel 91 is attached to the upper surface of the blower chamber FC. The top panel 91 is composed of a horizontally long rectangular metal frame that covers the upper surface of the housing 2, and has a square first opening 92L that exposes the first air outlet 11L and a square second that exposes the second air outlet 11R. An opening 92R is formed. In this embodiment, a reinforcing beam portion 94 is formed between the openings 92L and 92R, and protective grilles 93L and 93R are screwed to the left and right openings 92L and 92R with the beam portion 94 interposed therebetween. It has been stopped.

A feature of the present invention is an outdoor unit of an air conditioner that improves the heat dissipation efficiency of the heat sink 81 installed in the electrical component box 80 and reduces the influence of heat between electronic components arranged inside the electrical component box 80. Is to provide.

The electrical component box 80 is arranged on the back surface of the upper service panel 70A, and the surface facing the upper service panel 70A is the front surface 80a and the opposite surface is the back surface 80b. The surface close to the left side panel 30L is the left side surface 80d, and the surface close to the right side panel 30R is the right side surface 80c. As shown in FIGS. 5 and 6, the electrical component box 80 is a rectangular parallelepiped box made of sheet metal. Intake ports 87a and 87b for taking in air are provided inside the box at positions near the right side surface 80c and the left side surface 80d below the back surface 80b of the electrical component box 80, and the back surface of the electrical component box 80 is provided. Exhaust ports 88a and 88b for discharging air from the inside of the box are provided at positions near the right side surface 80c and the left side surface 80d on the upper part of the 80b. A ventilation passage 89 connecting the intake ports 87a and 87b and the exhaust ports 88a and 88b is formed inside the electrical component box 80. Inside the electrical component box 80, there are inverter boards 82a and 82b for compressors that control a compressor (not shown), and inverter boards 83a and 83b for fan motors that control a fan motor M that drives a blower fan (not shown). A smoothing circuit boards 84a and 84b for smoothing the current obtained by rectifying an AC power supply, a communication board (not shown) for communicating with an indoor unit (not shown), and the like are housed. In the present embodiment, the outdoor unit 1 is provided with two fan motors M and two compressors (not shown). Therefore, two compressor boards 82a and 82b, two fan motor inverter boards 83a and 83b, and two smoothing circuit boards 84a and 84b are provided. In the present invention, a substrate on which electronic components that generate a large amount of heat, such as compressor inverter substrates 82a and 82b and fan motor inverter substrates 83a and 83b, are mounted is referred to as a heat generating substrate. Further, a substrate on which electronic components such as smoothing circuit boards 84a and 84b that generate less heat are mounted is referred to as a control substrate in the present invention. In this embodiment, a smoothing circuit board is used as the control board, but the present invention is not limited to this, and any board on which an electronic component having a small amount of heat generation such as a rectifier circuit board is mounted may be used.

FIG. 5 shows a state in which a lid (not shown) for covering the front side of the electrical component box 80 has been removed. Intake ports 87a and 87b for taking in air into the electrical component box 80 are provided at positions near the right side surface 80c and the left side surface 80d below the back surface 80b of the electrical component box 80. Exhaust ports 88a and 88b for discharging air from the electrical component box 80 are provided at positions near the upper right side surface 80c and the left side surface 80d of the back surface 80b of the electrical component box 80. Inside the electrical component box 80, a smoothing circuit board 84b is located between the intake port 87b and the exhaust port 88b on the right side surface 80c side of the electrical component box 80 and the intake port 87a and the exhaust port 88a on the left side surface 80d side. , 84a are arranged. Reactors 86a and 86b are arranged above the smoothing circuit boards 84a and 84b, respectively. Further, the compressor inverter boards 82a and 82b and the fan motor inverter boards 83a and 83b are arranged in the vertical direction, the compressor inverter boards 82a and 82b are on the upper side, and the fan motor inverter boards 83a and 83b are on the lower side. It is arranged. The compressor inverter boards 82a and 82b and the fan motor inverter boards 83a and 83b are set, and two sets are arranged between the smoothing circuit boards 84a and 84b. In this embodiment, the first smoothing circuit board 84a and the first compression are provided in the ventilation path connecting the intake ports 87a and 87b and the exhaust ports 88a and 88b from the left side surface 80d side to the right side surface 80c side of the electrical component box 80. The machine inverter board 82a, the first fan motor inverter board 83a, the second compressor inverter board 82b, the second fan motor inverter board 83b, and the second smoothing circuit board 84b are arranged in this order. The electrical component box 80 is provided with intake ports 87a and 87b for taking in air inside the electrical component box 80 below the smoothing circuit boards 84a and 84b, and the electrical component box 80 is provided above the smoothing circuit boards 84a and 84b. Since the exhaust ports 88a and 88b for discharging air from the inside of the electric component box 80 are provided, the air 89a flows into the inside of the electrical component box 80 from the intake ports 87a and 87b and rises toward the upper side of the electrical component box 80. , Outflow from the exhaust ports 88a and 88b to the outside of the electrical component box 80. Therefore, the heat generated in the compressor inverter boards 82a and 82b is discharged to the outside of the electrical component box 80 without being affected by the heat on the fan motor inverter boards 83a and 83b on the windward side. Since the amount of heat generated by the fan motor inverter boards 83a and 83b is smaller than that of the compressor inverter boards 82a and 82b, the influence of heat on the compressor inverter boards 82a and 82b on the leeward side is small. Further, the heat generated in the reactors 86a and 86b is discharged to the outside of the electrical component box 80 without affecting the smoothing circuit boards 84a and 84b on the windward side.

Further, as shown in FIG. 6, an opening 85 is formed in the central portion 80bc of the back surface 80b of the electrical component box 80. The opening 85 includes an inverter board 82a for the first compressor, an inverter board 83a for the first fan motor, and electronic components mounted on the inverter board 82b for the second compressor and the inverter board 83b for the second fan motor. A contact heat sink 81 is arranged. The heat sink 81 is made of aluminum, and the heat radiation fins 81a project from the upper part to the lower part of the back surface 80b of the electrical component box 80, and are arranged in the internal space of the outdoor unit 1. The heat radiation fins 81a are formed of a plurality of plate-shaped convex portions, each of which extends in the vertical direction and is arranged in parallel in the horizontal direction. Of the back surface 80b of the electrical component box 80, the left and right ends 80ba and 80bb on which the heat sink 81 is not arranged are flat surfaces. Intake ports 87a and 87b are provided at the lower portions of the left and right end portions 80ba and 80bb, respectively, and exhaust ports 88a and 88b are provided at the upper portions thereof, respectively. Further, inside the electrical component box 80, smoothing circuit boards 84a and 84b are provided at positions facing the flat surface. In the present embodiment, the heat sink 81 is arranged at the central portion 80bc of the back surface 80b of the electrical component box 80, so that the heat sinks are arranged at both ends 80ba and 80bb of the back surface 80b of the electrical component box 80 as in the conventional case. Compared with the case, as shown by the thick arrow in FIG. 3, the air 89a sucked from the through hole of the grill portion 51 on the front side of the outdoor unit 1 is more likely to flow to the back surface 80b of the electrical component box 80. Then, as shown in FIG. 6, the air sucked from the suction ports in the left-right direction of the electrical component box 80 and flowing above the heat sink 81 flows upward by the blower 4, and thus flows to the back side of the heat sink 81. , The heat dissipation efficiency of the heat sink 81 can be improved. Further, as shown in FIG. 6, on both sides of the heat radiating fins 81a of the heat sink 81, air going upward from the lower side of the electric component box 80 enters the electric component box 80 from the intake ports 87a and 87b at the lower part, so that the rear surface thereof. At the left and right ends 80ba of the 80b and in the center of the 80bb, only the air in the left-right direction toward the heat radiating fin 81a of the heat sink 81 is left and right, and does not collide with the air in different directions. Is easy to flow to the heat sink 81a. Further, since the inverter board 82a for the first compressor and the inverter board 83a for the first fan motor are adjacent to the inverter board 82b for the second compressor and the inverter board 83b for the second fan motor, one heat sink 81 is provided. By arranging the heat sink 81 in the center of the back surface 80b of the electrical component box 80, it becomes easy to balance the left and right weights of the electrical component box 80, and it becomes easy to install the electrical component box 80.

As described above, according to the present invention, the heat generating boards (compressor inverter boards 82a, 82b and fan motor inverter boards 83a, 83b) that generate a large amount of heat are arranged in the center inside the electrical component box 80. By arranging control boards (smoothing circuit boards 84a, 84b, etc.) having a small amount of heat generation at both ends, the control board is less likely to be affected by the heat generated by the heat generation board. Further, since the heat sink 81 is arranged in the center of the back surface 80b of the electrical component box 80, the air sucked from the grill portion 51 on the front side of the outdoor unit 1 can easily flow to the back side of the heat sink 81. Further, by combining the heat sinks for the two heat generating boards into one heat sink 81, it is possible to reduce the number of heat sink mounting portions and the like as compared with the case where the heat sinks are provided for each inverter board, so that the heat sink can be miniaturized.

1 Outdoor unit of air conditioner 2 Housing 3 Heat exchanger 4 Blower 50 Front pillar 51 Grill part 80 Electrical equipment box 81 Heat sink 82a, 82b Inverter board for compressor 83a, 83b Inverter board for fan motor 84a, 84b Smoothing circuit board

Claims (3)

A box-shaped housing with front, back, top, right and left sides, with suction ports on at least one side and back of the right and left sides.
An air outlet is provided on the upper surface of the housing, and inside the housing,
A heat exchanger is arranged at a position facing the suction port.
A blower fan is placed below the outlet.
An electrical component box having a front surface and a back surface is housed on the front side of the housing.
The electrical component box is provided with an intake port for taking in air into the electrical component box at a position closer to one side of the housing in the lower part of the back surface of the electrical component box.
The electrical component box is provided with an exhaust port for discharging air from the electrical component box at a position closer to one side of the housing in the upper part of the back surface of the electrical component box.
There are two intake ports and two exhaust ports of the electrical component box on the back surface of the electrical component box.
One of the two intake ports is arranged at a position closer to one side surface of the housing on the back surface of the electrical component box, and the other is arranged at a position closer to the other end surface of the housing on the back surface of the electrical component box.
One of the two exhaust ports is arranged at a position closer to one side surface of the housing on the back surface of the electrical component box, and the other is arranged at a position closer to the other end surface of the housing on the back surface of the electrical component box.
At least one control board on which electronic components that generate less heat are mounted is provided in the electrical component box.
At least one heat-generating substrate on which electronic components that generate a large amount of heat are mounted is provided in the electrical component box.
A heat sink for cooling the heat generating substrate is provided on the back surface of the electrical component box .
Comprising a radiation fin heat sink is formed of a plurality of convex portions, and between the two intake ports, in the outdoor unit of the two said radiation air conditioner fins Ru is disposed between the exhaust port,
The control board is arranged in a ventilation path connecting the intake port and the exhaust port.
The heat generating board is arranged at a position adjacent to the control board and away from one side surface of the housing with respect to the control board.
An outdoor unit of an air conditioner, wherein the heat sink is arranged so as to be in contact with the heat generating substrate. The outdoor unit of an air conditioner according to claim 1, wherein the convex portions are parallel to each other and are formed from the upper portion to the lower portion of the back surface of the electrical component box. Two of the blowers were installed
A first control board and a second control board are provided as the control board.
A first heat generating substrate and a second heat generating substrate are provided as the heat generating substrate, and the heat generating substrate is provided.
In the ventilation path connecting the intake port and the exhaust port, the first control board, the first heat generation board, the second heat generation board, and the second control board are provided from one side surface side to the other side surface side of the housing. The outdoor unit of the air conditioner according to any one of claims 1 and 2, wherein the air conditioners are arranged in order.

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