JP2010270944A - Outdoor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outdoor unit capable of sufficiently cooling an electric component unit in an electric component box. <P>SOLUTION: The electric component box 40 has a body section 41 disposed in a machine chamber R2, and a projecting section 42 formed in a state of projecting from the machine chamber R2 to a heat exchange chamber R1 side, first electric component boards 51A, 51B are disposed at a front side of the machine chamber R2 of the body section 41, a second electric component board 52 and a heat sink 60 of the second electric component board 52 are disposed on the projecting section 42, and the cooling air from an intake 63 formed on a back face of the machine chamber R2 is branched so that the cooling air of one side cools electric components of front faces of the first electric component boards 51A, 51B, and then joined to the other cooling air for cooling the heat sink 60 of the second electric component board 52, to cool the heat sink 60 and to be introduced to a negative pressure side of an air blower 22 of the heat exchange chamber R1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention divides the inside of the unit case vertically with a partition plate and divides it into a heat exchange chamber and a machine room. The heat exchange chamber contains a heat exchanger and a blower, and the machine room contains a compressor and an electrical box. It relates to the housed outdoor unit.

Generally, in an outdoor unit of an air conditioner, the inside of a unit case is partitioned vertically by a partition plate and divided into a heat exchange chamber and a machine room, and a heat exchanger and a blower are accommodated in the heat exchange chamber. Some contain compressors and electrical boxes.
In this type of electrical box, a part of the electrical box is formed by projecting from the machine room to the heat exchange chamber side, and the heat sink of the electrical unit is disposed on the projecting part, and the negative pressure of the blower causes the machine room to be exposed to the machine room from the back. There has been proposed one having a configuration in which the introduced outside air is guided to a heat sink of an electrical unit, and the heat sink is cooled and then blown out to a heat exchange chamber (for example, see Patent Document 1).
JP 2009-30884 A

  By the way, in this type of electrical equipment box, maintenance work is performed by removing the front panel of the outdoor unit. For this reason, for example, when the electrical box includes a plate member that extends substantially straight in the width direction of the machine room, and the electrical unit separate from the electrical unit is disposed on the front surface of the plate member, the electrical unit from the front side. Various operations are easy. However, in this case, the cooling air introduced into the machine room from the back of the machine room is unlikely to pass through the front side of the plate member, and there is a situation where the cooling of the electrical unit disposed on the front side of the plate member is not sufficient. There is a fear.

  This invention is made | formed in view of the situation mentioned above, and it is providing the outdoor unit which can fully cool the electrical equipment unit in an electrical equipment box.

  In order to solve the above-described problems, the present invention divides the inside of a unit case vertically into a heat exchange chamber and a machine room with a partition plate, the heat exchange chamber contains a heat exchanger and a blower, and the machine room is compressed. In the outdoor unit containing the machine and the electrical box, the electrical box includes a main body portion disposed in the machine room, and an overhang part formed to project from the machine room to the heat exchange chamber side. The first electrical unit is disposed on the front side of the machine room of the section, the heat sink of the second electrical unit is disposed on the overhanging part, and the cooling air from the back of the machine room is branched, After cooling the electronic components on the front surface of the first electrical unit, it merges with the other cooling air that cools the heat sink of the second electrical unit, cools the heat sink, and It characterized in that is introduced into the suction side of the serial blower.

  According to this configuration, since the cooling air from the back of the machine room is branched and one cooling air is supplied to the front side of the first electrical unit, the electronic components on the front surface of the first electrical unit are sufficiently cooled. can do. Further, after this one cooling air cools the electronic component on the front surface of the first electrical unit, it merges with the other cooling air that cools the heat sink of the second electrical unit, so that a sufficient amount of cooling air is generated by the second electrical device. Since it flows to the heat sink of the unit, this heat sink can be sufficiently cooled. Furthermore, since the combined cooling air is cooled and introduced into the negative pressure side of the fan in the heat exchange chamber, the cooling air can flow smoothly into the heat exchange chamber, and is sufficiently cooled in the machine room and the electrical box. Wind can flow.

  In the above configuration, the electrical box cools the cooling air from the back of the machine room, one cooling air that cools the electronic components on the front surface of the first electrical unit, and the heat sink of the second electrical unit. It is good also as a structure provided with the branch plate branched to the other cooling air. According to this configuration, the cooling air from the back of the machine room can be easily branched into one cooling air and the other cooling air with a simple structure such as providing a branch plate. It can be cooled sufficiently.

The main body includes a first electrical unit support plate that extends in the width direction of the machine room and supports the first electrical unit on the front side, and the overhanging part includes the second electrical unit on the front side. The unit is arranged along a second electrical unit support plate for supporting the heat sink on the back side, and substantially along the second electrical unit support plate, and cooling the heat sink in cooperation with the second electrical unit support plate. It is good also as a structure which provided the guide plate which forms a wind path of a wind, and provided the said branch plate between this guide plate and the said 1st electrical equipment unit support plate.
According to this configuration, by providing the branch plate between the guide plate and the first electrical unit support plate, the other cooling air flows from the rear surface of the machine room toward the heat sink of the second electrical unit. Resistance. For this reason, the air volume of the other cooling air decreases, and accordingly, the air volume of one cooling air flowing from the rear surface of the machine room toward the first electrical equipment unit increases, so that the electrons on the front surface of the first electrical equipment unit are increased. Parts can be efficiently cooled.

  According to the present invention, since the cooling air from the back of the machine room is branched and one cooling air is supplied to the front side of the first electrical unit, the electronic components on the front surface of the first electrical unit are sufficiently cooled. can do. Further, after this one cooling air cools the electronic component on the front surface of the first electrical unit, it merges with the other cooling air that cools the heat sink of the second electrical unit, so that a sufficient amount of cooling air is generated by the second electrical device. Since it flows to the heat sink of the unit, this heat sink can be sufficiently cooled. Furthermore, since the combined cooling air is cooled and introduced into the negative pressure side of the fan in the heat exchange chamber, the cooling air can flow smoothly into the heat exchange chamber, and is sufficiently cooled in the machine room and the electrical box. Wind can flow.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The air conditioner according to this embodiment includes an outdoor unit 10 and an indoor unit (not shown), and performs a cooling operation and a heating operation by flowing a refrigerant through a refrigerant circuit connected by a refrigerant pipe. The outdoor unit 10 is installed outside and exchanges heat with outdoor air to condense the refrigerant during cooling operation and release heat to the outside air, and evaporate the refrigerant during heating operation and take in heat from the outside air. In addition, the directions such as up and down and left and right described below indicate directions when the outdoor unit 10 is viewed from the front side in a state where the outdoor unit 10 is installed.

  FIG. 1 is a perspective view showing an internal configuration of the outdoor unit 10, and FIG. 2 is a view of the outdoor unit 10 as viewed from above. The outdoor unit 10 includes a unit case (housing) 11 having a substantially rectangular parallelepiped box shape. The unit case 11 includes a bottom plate 12, a top plate (not shown), a front panel 13 (FIG. 2), and an outer plate 14 (FIG. 2), the inside of the unit case 11 is vertically partitioned by a partition plate 15 extending vertically from the bottom plate 12, and is divided into a heat exchange chamber R1 and a machine chamber R2. In the example of FIG. 1, the top plate, the front panel, and the outer plate of the unit case 11 are indicated by broken lines. As shown in FIG. 2, the front panel 13 is composed of a first front panel 13A and a second front panel 13B that are divided into left and right sides with a partition plate 15 as a boundary. By removing the front panels 13A and 13B, The operator can perform maintenance work on the components in the heat exchange chamber R1 and the machine room R2 from the front side.

  As shown in FIG. 2, the heat exchange chamber R <b> 1 contains a heat exchanger 21 on the back side and a blower 22 on the front side. More specifically, the heat exchanger 21 is formed by being bent into a substantially L shape when viewed from above, and is disposed along the back surface from the left side surface of the heat exchange chamber R1, and the exposed surface from the left side surface to the back surface. The whole is covered with a finger (not shown) made of a net or the like that can prevent a human body or the like from contacting the heat exchanger 21 while securing a ventilation path (suction port). In this configuration, the outer plate 14 is formed by being bent in a substantially L shape when viewed from above, and constitutes the back surface portion 14 </ b> A and the right side surface portion 14 </ b> B of the unit case 11 connected to the heat exchanger 21.

As shown in FIG. 1, the blower 22 includes a fan motor 26 fixed to a pair of left and right support posts 24 </ b> L and 24 </ b> R in the heat exchange chamber R <b> 1 via a pedestal 25, and a propeller fan attached to the shaft of the fan motor 26. (Axial fan) 27, and this propeller fan 27 is disposed close to the front side of the heat exchange chamber R1. Further, as shown in FIG. 2, the front portion of the propeller fan 27 enters a round flange-shaped fan cover portion 28 provided in the first front panel 13A of the heat exchange chamber R1, and this fan cover portion 28 The opening functions as a ventilation path (air outlet), and the opening is covered with a fan guard 29 that prevents the propeller fan 27 from contacting a human body or the like.
When the propeller fan 27 is rotationally driven by the fan motor 26, outside air is sucked into the heat exchange chamber R1 from the periphery of the outdoor unit 10, more specifically from the back side and the left side of the heat exchanger 21, and heat is generated. After passing through the substantially front surface of the exchanger 21, it is discharged outside through the fan cover portion 28 on the front surface of the heat exchange chamber R1. That is, the outdoor unit 10 is configured as a front blowing type that blows out air after heat exchange from the front.

In addition, a compressor circuit, an accumulator 32, and refrigerant circuit components such as a valve body such as a four-way valve 33 and expansion valves 34A and 34B constituting a part of the refrigerant circuit are connected to the machine room R2 by piping. It is accommodated in a substantially lower space. In this configuration, the accumulator 32 (FIG. 2) is provided above the compressor 31. One end side of the piping of these refrigerant circuit components is connected to the indoor unit via the heat exchanger 21, and the other end side of the piping of the refrigerant circuit components is connected to the indoor unit. A circulating refrigerant circuit is configured.
An electrical box 40 in which various electrical units such as a control board for controlling the air conditioner are disposed is disposed in the upper space of the machine room R2.

Next, the electrical box 40 will be described in detail.
FIG. 3 is a perspective view of the electrical box 40 as viewed from the substantially front side of the outdoor unit 10 together with its peripheral configuration, and FIG. 4 is a perspective view of the electrical box 40 viewed from the substantially back side of the outdoor unit 10.
As shown in FIGS. 1 and 3, the electrical box 40 is fixed on the partition plate 15, and is formed to protrude from the machine room R <b> 2 to the heat exchange room R <b> 1 side with the main body 41 arranged in the machine room R <b> 2. And an overhang portion 42.
The main body 41 is fixed to the first electrical unit support plate 43 extending in the width direction of the machine room R2 on the front side of the machine room R2, and to the right side end side of the first electrical unit support plate 43. A terminal support plate 44 provided along the right side surface portion 14B of the plate 14, and each of the first electrical unit support plate 43 and the terminal support plate 44 performs sheet metal processing such as bending on a single metal plate. Formed.
As shown in FIGS. 3 and 4, the terminal support plate 44 is integrally formed with three plate portions 44A, 44B and 44C which are bent and divided into upper and lower portions, and an upper plate portion 44A and an intermediate plate portion 44B. Are arranged with a wiring connection component 57 such as a terminal base, and a ground wire connection portion 58 for connecting a substrate ground wire and a terminal ground wire. Further, as shown in FIG. 1, the lower plate portion 44 </ b> C is fixed to the service valve support plate 16 disposed on the right side surface portion 14 </ b> B of the outer plate 14.

  As shown in FIG. 3, the first electrical unit support plate 43 is formed to have substantially the same width as the width direction of the machine room R <b> 2. One electrical board (first electrical unit) 51A, 51B is arranged. Thus, by removing the second front panel 13B, the operator can easily access the first electrical boards 51A and 51B, and the maintenance for the first electrical boards 51A and 51B can be easily performed. In this configuration, the lower end portion 43A and the right end portion 43B of the first electrical unit support plate 43 are each bent forward, and a notch 43C is formed below the right end portion 43B. This notch 43C forms a cooling air passage that flows through the machine room R2 and cools the first electrical boards 51A and 51B.

On the other hand, as shown in FIGS. 3 and 4, the overhanging portion 42 includes a second electrical unit support plate 45 that extends obliquely forward from the partition plate 15 toward the heat exchange chamber R <b> 1, and the second electrical unit support plate 45. A second electrical board (second electrical unit) 52 is arranged on the front side.
The second electrical component substrate 52 is a substrate on which various electrical units for performing operation and operation control of each part of the air conditioner are mounted. For example, a substrate on which an electrical component having a relatively large amount of heat generation such as an inverter circuit is mounted. It is. That is, the second electrical board 52 is a board that generates more heat than the first electrical boards 51A and 51B. For this reason, on the back side of the second electrical unit support plate 45, a heat sink 60 is provided that is disposed in close contact with the back side of the second electrical unit support plate 45. The heat sink 60 has a configuration in which metal plate members constituting a plurality of fins are arranged at intervals in the vertical direction, and is fixed from the front side of the second electrical unit support plate 45 with screws or the like.

The overhanging portion 42 surrounds the second electrical unit support plate 45, the second electrical unit substrate 52, and the heat sink 60 and cooperates with the second electrical unit support plate 45 to form a cooling air passage 59 for the heat sink 60. 46. The guide plate 46 is formed by performing sheet metal processing such as bending on a single metal plate, and includes a front plate portion 46A, a first inclined portion 46B, a second inclined portion 46C, a third inclined portion 46D, and a back plate portion. 46E and a tongue piece portion 46F, the front plate portion 46A is fixed to the partition plate 15, and the tongue piece portion 46F is fixed to the tube plate of the heat exchanger 21.
In this configuration, the second inclined portion 46C of the guide plate 46 is disposed substantially parallel to the second electrical unit support plate 45, and the first inclined portion 46B connected to the second inclined portion 46C is the air path 59 of the heat sink 60. It is arranged on the exit side. The first inclined portion 46B and the second inclined portion 46C are respectively provided with vent holes 61 and 62 (FIG. 3) through which the cooling air that has passed through the heat sink 60 is blown into the heat exchange chamber R1. The ventilation openings 61 and 62 are formed by cutting and raising the first inclined portion 46B and the second inclined portion 46C, and the cooling air that has passed through the heat sink 60 is blown out from the ventilation openings 61 and 62 to the negative pressure side of the blower 22. It is like that. In the overhanging portion 42, a bottom plate 47 is attached to the lower part of the guide plate 46, and the inside of the overhanging portion 42 and the heat exchange chamber R1 are separated by the bottom plate 47. Thereby, invasion of dust and raindrops from the heat exchange chamber R1 into the overhanging portion 42 is prevented.
Further, on the partition plate 15, a connecting plate portion 48 that connects the first electrical unit support plate 43 and the second electrical unit support plate 45 is provided. The connecting plate portion 48 includes the first electrical board 51 </ b> A, An opening 48A for guiding the cooling air that has passed through the front surface of 51B to the inlet of the heat sink 60 is formed. Further, the connecting plate portion 48 and the second electrical unit support plate 45 are fixed by a fixing piece 49.

As described above, the vent holes 61 and 62 formed in the projecting portion 42 are blown out to the negative pressure side of the blower 22 in the heat exchange chamber R1. For this reason, when the blower 22 is operated, outside air is sucked into the machine room R2 through the intake port 63 (FIG. 4) formed in the back surface of the machine room R2, and this outside air is sent to each of the electrical boards 51A, 51B, 52 and the heat sink 60. Is cooled and flows into the heat exchange chamber R1.
In this configuration, the electrical box 40 cools the cooling air from the back of the machine room R2 with one cooling air that cools the electronic components on the front surface of the first electrical boards 51A and 51B and the heat sink 60 of the second electrical board 52. A branch plate 70 that branches into the other cooling air is provided. Specifically, as shown in FIG. 3, the branch plate 70 is disposed so as to connect the back plate portion 46 </ b> E of the guide plate 46 and the first electrical unit support plate 43. A cutout 70 </ b> A that forms a gap with the upper surface of the accumulator 32 is provided at the lower edge portion.

By providing a branch plate 70 between the back plate portion 46E of the guide plate 46 and the first electrical unit support plate 43, the branch plate 70 is cooled on the other side from the intake port 63 to the inlet portion 60A of the heat sink 60. It functions as a draft resistance that suppresses the flow of wind.
Therefore, a part of the outside air sucked from the intake port 63 flows to the inlet 60A of the heat sink 60 through the notch 70A as shown by a solid arrow A in FIG. 5, but the branch plate 70 becomes a resistance. Therefore, as shown by a solid arrow B in FIG. 5, the remaining outside air passes through the front surface of the first electrical unit support plate 43 and the opening 48A (FIG. 3) of the connecting plate portion 48 to the inlet portion 60A of the heat sink 60. By flowing, the outside air is branched by the branch plate 70.
In this configuration, since the branch plate 70 becomes a resistance, the amount of the other cooling air flowing to the inlet 60A of the heat sink 60 through the notch 70A is reduced, and accordingly, the first electrical board 51A, By increasing the amount of one cooling air flowing toward 51B, the electronic components on the front surface of the first electrical boards 51A and 51B can be efficiently cooled.

  One cooling air that has cooled the electronic components on the front surface of the first electrical boards 51A and 51B merges with the other cooling air through the notch 70A at the entrance 60A of the heat sink 60. For this reason, the combined cooling air flows with a sufficient amount of airflow to the heat sink 60 of the second electrical board 52, so that the heat sink 60 is sufficiently cooled. The cooling air flowing through the heat sink 60 flows to the negative pressure side of the blower 22 in the heat exchange chamber R1 through the ventilation openings 61 and 62 of the guide plate 46, and is discharged outside through the opening of the fan cover 28. The Thereby, various components in the machine room R2 can be cooled.

As described above, according to the present embodiment, the electrical box 40 includes the main body portion 41 disposed in the machine room R2, and the overhanging portion 42 formed to project from the machine room R2 to the heat exchange chamber R1. The first electrical boards 51A and 51B are disposed on the front side of the machine room R2 of the main body 41, and the second electrical board 52 and the heat sink 60 of the second electrical board 52 are disposed on the overhanging part 42, and the machine room Since the cooling air from the intake port 63 formed on the rear surface of R2 is branched and one cooling air is supplied to the first electric boards 51A and 51B, the electronic components on the front surface of the first electric boards 51A and 51B are sufficiently provided. Can be cooled to.
In addition, after this one cooling air cools the electronic components on the front surface of the first electrical boards 51A and 51B, it merges with the other cooling air that cools the heat sink of the second electrical equipment unit. Since it flows to the heat sink 60 of the second electrical component substrate 52, the heat sink 60 can be sufficiently cooled. Furthermore, since the combined cooling air cooled the heat sink 60 and was introduced to the negative pressure side of the blower 22 in the heat exchange chamber R1, the cooling air can be smoothly flowed into the heat exchange chamber R1, and the machine room R2 and the electrical equipment Sufficient cooling air can flow through the box 40.

  In addition, according to the present embodiment, the main body 41 includes the first electrical unit support plate 43 that extends in the width direction of the machine room R2 and supports the first electrical boards 51A and 51B on the front surface side. 42 is disposed substantially along the second electrical unit support plate 45 that supports the second electrical component substrate 52 on the front side and the heat sink 60 on the rear side, and the second electrical unit support plate 45. A guide plate 46 having a second inclined portion 46C that forms a cooling air flow path 59 of the heat sink 60 in cooperation with the unit support plate 45. The back plate portion 46E of the guide plate 46 and the first electrical unit support Since the branch plate 70 is provided between the plate 43 and the plate 43, the branch plate 70 becomes a resistance against the other cooling air flowing toward the heat sink 60 from the air inlet 63 formed on the back surface of the machine room R2. For this reason, the air volume of the other cooling air is reduced, and accordingly, the air volume of the one cooling air flowing from the rear surface of the machine room R2 toward the first electrical boards 51A and 51B is increased. The electronic components on the front surfaces of 51A and 51B can be efficiently cooled.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change implementation is possible. For example, the first electrical boards 51A and 51B and the second electrical board 52 arranged in the electrical box 40 are not limited to the electrical units described above, and can be changed as appropriate. In addition, the space on the back side of the first electrical unit support plate 43 of the electrical box 40 may be used as an arrangement space for other electrical equipment units or an arrangement space for refrigerant circuit components such as piping. The layout of various components may be changed as appropriate. Moreover, it is applicable not only to the outdoor unit in which one fan 22 is arranged, but also to an outdoor unit in which a plurality of fans 22 are arranged.

It is a perspective view which shows the internal structure of the outdoor unit which concerns on this embodiment. It is the figure which looked at the outdoor unit from the upper part. It is the perspective view which looked at the electrical equipment box from the substantially front side of the outdoor unit together with its peripheral configuration. It is the perspective view which looked at the electrical equipment box from the substantially back side of the outdoor unit. It is a top view explaining the flow of the cooling air in an electrical equipment box.

DESCRIPTION OF SYMBOLS 10 Outdoor unit 15 Partition plate 21 Heat exchanger 22 Blower 31 Compressor 32 Accumulator 40 Electrical box 41 Main body part 42 Overhang part 43 1st electrical unit support plate 44 Terminal support plate 45 2nd electrical unit support plate 46 Guide plate 46A Front plate Part 46B First inclined part 46C Second inclined part 46D Third inclined part 46E Back plate part 46F Tongue piece part 47 Bottom plate 48 Connection plate part 48A Opening part 51A, 51B First electrical component board (first electrical component unit)
52 Second electrical component board (second electrical component unit)
59 Air path 60 Heat sink 60A Inlet 61, 62 Ventilation port 63 Air intake port 70 Branch plate 70A Notch A Solid line arrow B Solid line arrow R1 Heat exchange chamber R2 Machine room

Claims (3)

In the outdoor unit in which the inside of the unit case is partitioned vertically with a partition plate into a heat exchange chamber and a machine room, a heat exchanger and a blower are accommodated in the heat exchange chamber, and a compressor and an electrical box are accommodated in the machine room.
The electrical box includes a main body disposed in the machine room, and an overhang formed by projecting from the machine room to the heat exchange chamber, and a first electrical device is provided on the front side of the machine room of the main body. In addition to arranging the unit, the heat sink of the second electrical component unit is disposed in the overhanging portion, and the cooling air from the back of the machine room is branched, and one cooling air is used for the electronic component on the front surface of the first electrical component unit. After cooling, the outdoor unit is combined with the other cooling air that cools the heat sink of the second electrical unit, and the heat sink is cooled and introduced to the negative pressure side of the blower of the heat exchange chamber .   The electrical box has cooling air from the back of the machine room, one cooling air that cools the electronic components on the front surface of the first electrical unit, and the other cooling air that cools the heat sink of the second electrical unit. The outdoor unit according to claim 1, further comprising a branching plate that branches into the two.   The main body includes a first electrical unit support plate that extends in the width direction of the machine room and supports the first electrical unit on the front side, and the projecting portion includes the second electrical unit on the front side. A second electrical unit support plate for supporting the heat sink on the back side, and the second electrical unit support plate disposed substantially along the second electrical unit support plate, in cooperation with the second electrical unit support plate, The outdoor unit according to claim 2, further comprising a guide plate that forms an air passage, and the branch plate is provided between the guide plate and the first electrical unit support plate.

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