WO2014034564A1

WO2014034564A1 - Outdoor unit for air conditioner

Info

Publication number: WO2014034564A1
Application number: PCT/JP2013/072577
Authority: WO
Inventors: 克弥石井; 佐野　充邦; 勝美古結; 達弘横木; 加藤　裕二
Original assignee: 株式会社東芝; 東芝コンシューマエレクトロニクス・ホールディングス株式会社; 東芝ホームアプライアンス株式会社
Priority date: 2012-08-27
Filing date: 2013-08-23
Publication date: 2014-03-06
Also published as: JP2014044007A; CN104662372A; CN104662372B; KR20150033723A; KR101917915B1; KR20160145208A

Abstract

An outdoor unit for an air conditioner is provided with: a heat exchange chamber in which a blower and outdoor heat exchanger are provided; a machine chamber in which a compressor is provided; a divider plate that is provided vertically with respect to a bottom plate constituting a bottom part of the heat exchange chamber and machine chamber and divides the heat exchange chamber and machine chamber; an electrical component box that is on the upper part of the divider plate and is provided so as to straddle the machine chamber and heat exchange chamber; an inverter substrate that is inside the electrical component box, has a plurality of electrical components, has a first electrical component, out of the plurality of electrical components, that has a high temperature during air conditioning operation disposed on the heat exchange chamber side and a second electrical component for which the heat generation during air conditioning operation is small disposed on the machine chamber side; and a heat sink provided on the heat exchange chamber side between the first electrical component and the second electrical component.

Description

Air conditioner outdoor unit

Embodiment of this invention is related with the outdoor unit of an air conditioner.

The outdoor unit of the air conditioner has a heat exchange room and a machine room. The heat exchange chamber and the machine room are partitioned by a partition plate provided vertically from the bottom. A fan and an outdoor exchanger are provided in the heat exchange chamber. A compressor is provided in the machine room. The outdoor unit of an air conditioner includes an electrical component box. The electrical component box is provided at the upper end of the partition plate and straddles the heat exchange chamber and the machine chamber. An electric part for driving and controlling a compressor, a blower and the like is accommodated in the electric part box.

The inverter board is accommodated in the electrical component box. The inverter board is mounted with a switching element, which is an electrical component, an electrolytic capacitor, and the like, and a heat sink for heat dissipation is attached. The heat sink is attached so as to be exposed on the lower surface of the end portion closest to the heat exchange chamber so as to facilitate heat dissipation.

JP 2004-125260 A

Conventionally, for example, a step-up transformer or the like has been configured separately from an electric component box without being provided on the inverter board because it is a heavy object and generates significant heat accompanying air-conditioning operation. Therefore, the conventional configuration requires a space for mounting the step-up transformer separately from the electrical component box, which complicates the structure of the outdoor unit and invites an increase in the size of the housing.

Further, in the conventional configuration, among the electrical components provided in the electrical component box, for example, switching elements and the like, which become hot during the air conditioning operation, are collectively arranged on one side, and an electrolytic capacitor or the like that generates less heat is disposed on the other side. It is implemented collectively. However, by accommodating parts that are high in temperature and parts that generate little heat in one box, a rise in temperature in the box is inevitable.

For these reasons, the air conditioner has a structure in which it is difficult for the electrical components that generate heat and generate high temperatures due to air conditioning operation to hardly affect the electrical components that generate less heat while suppressing the increase in size of the electrical component box. An outdoor unit was desired.

The outdoor unit of the air conditioner in the present embodiment constitutes a heat exchange chamber provided with a blower and an outdoor heat exchanger, a machine room provided with a compressor, and a bottom part of the heat exchange chamber and the machine room. A partition plate provided upright with respect to the bottom plate and partitioning the heat exchange chamber and the machine chamber, and an electrical component provided above the partition plate and straddling the machine chamber and the heat exchange chamber A first electrical component that is at a high temperature during the air-conditioning operation among the plurality of electrical components, and is disposed in the heat exchange chamber side; An inverter board in which a second electric component with little heat generation is arranged on the machine room side, and a heat sink provided on the heat exchange chamber side between the first electric component and the second electric component.

The perspective view which decomposes | disassembles and shows the outdoor unit of the air conditioner by one Embodiment Cross-sectional plan view of outdoor unit explaining the flow of wind when the blower is driven (A) is a plan view of the electrical component box, (B) is a front view of the electrical component box An exploded perspective view showing the electrical component box in an inverted position The perspective view which shows the state inside the electrical component box which was the posture which turned the electrical component box upside down and removed the base storage box Sectional view from the front of the electrical component box explaining the temperature countermeasures in the electrical component box Front view with the front panel of the outdoor unit removed explaining the state of water splash when driving the blower The front view which expanded the principal part of FIG. 7 for demonstrating the positional relationship of an air blower and an electrical component box structure. Sectional view from the front of the electrical component box explaining noise countermeasures in the electrical component box

Hereinafter, an embodiment will be described with reference to the drawings.
The outdoor unit 1 shown in FIG. 1 has a bottom plate 1a, a front plate 1b, a top plate 1c, a side plate 1d, and a back plate. The bottom plate 1a, the front plate 1b, the top plate 1c, the side plate 1d, and the back plate 1e shown in FIG. 2 constitute a casing that serves as an outer shell of the outdoor unit 1. FIG. 1 shows the outdoor unit 1 with the front plate 1b and the top plate 1c removed. A partition plate 2 is provided on the bottom plate 1a. A fan guard 3 is fitted into the front plate 1b. The top plate 1c is formed in a flat plate shape and does not have an opening.

The inside of the casing of the outdoor unit 1 is divided by a partition plate 2 into a heat exchange chamber 6 on one side of the outdoor unit 1 and a machine room 10 on the other side. An outdoor heat exchanger 4 and a blower 5 are provided in the heat exchange chamber 6. The outdoor heat exchanger 4 is configured in a substantially L shape in plan view. The blower 5 is provided on the bottom plate 1 a and is opposed to the outdoor heat exchanger 4. In the machine room 10, a compressor 7 and a gas-liquid separator 8, and pipes 9 connected to the compressor 7 and the gas-liquid separator 8 are provided.

The outdoor unit 1 includes an electrical component box D. The electrical component box D is provided at the upper end of the partition plate 2. The electrical component box D is provided across the heat exchange chamber 6 and the machine room 10. That is, one side part of the electrical component box D projects to the heat exchange chamber 6 side, and the other side part projects to the machine room 10 side. The upper end portion of the partition plate 2 is recessed in a concave shape corresponding to the portion where the electric component box D is placed. In this case, in the state where the electric component box D is placed on the upper end portion of the partition plate 2, the height of the upper surface of the electric component box D substantially matches the height of the upper end of the outdoor heat exchanger 4.

A part of the electrical component box D is provided so as to protrude into the heat exchange chamber 6. Therefore, as shown in FIG. 2, a part of the blower 5 provided on the bottom plate 1a is hidden behind the electric component box D and cannot be seen. The back plate 1e and the left side plate 1d in FIGS. 1 and 2 are each configured in a frame shape. Therefore, the outdoor heat exchanger 4 is exposed to the outside.

When the blower 5 is driven, outside air is sucked into the heat exchange chamber 6 from the back and side surfaces of the outdoor heat exchanger 4. At this time, the outside air is heat-exchanged through the outdoor heat exchanger 4, and then is guided by the partition plate 2 and flows through the heat exchange chamber 6. Part of the air flowing in the heat exchange chamber 6 flows along the electric component box D, and cools the electric component box D from the outer surface side of the electric component box D. That is, a part of the air flowing in the heat exchange chamber 6 flows to the side surface portion and the lower surface portion in the portion protruding to the heat exchange chamber 6 side of the electric component box D, and then the fan of the front plate 1b shown in FIG. It blows out from the guard 3 to the outside.

As shown in FIG. 3, the electrical component box D has a substrate storage box cover 11 and a substrate storage box 12. The substrate storage box cover 11 and the substrate storage box 12 constitute an outer shell of the electrical component box D. The substrate storage box cover 11 has a lid shape and constitutes the upper part of the outer shell of the electrical component box D. The substrate storage box 12 constitutes the lower part of the outer shell of the electrical component box D. The substrate storage box 12 is made of a metal plate, has a box shape, and has an upper surface opened.

As shown in FIG. 3B and FIG. 4, the substrate storage box 12 has a recess 12a. The recessed portion 12a is located in a portion closer to one side from the central portion in the left-right direction of the substrate storage box 12, and is recessed in a concave shape.

The substrate storage box 12 is provided with a heat sink 13. The heat sink 13 is made of a metal material having excellent heat dissipation. The heat sink 13 integrally includes a plurality of fins 13a and a root portion 13b. The root portion 13b is configured in a plate shape. The plurality of fins 13a are provided upright in a direction substantially perpendicular to the root portion 13b. Note that the fin 13a does not need to be completely perpendicular to the root portion 13b, and may be perpendicular to an extent that allows an error in manufacturing. Furthermore, the fins 13a may be provided so as to be inclined with respect to the root portion 13b.

The fins 13a are provided with a predetermined gap therebetween. As shown in FIG. 4, a collar portion 13c protruding in the left-right direction is formed around the root portion 13b. The fin 13 a protrudes downward from the recess 12 a in a state where the heat sink 13 is provided in the substrate storage box 12. The root portion 13b faces the hollow portion 12a of the electrical component box D.

FIG. 4 is an exploded perspective view of the electric component box D turned upside down, and shows the upper and lower surfaces opposite to the actual arrangement incorporated in the outdoor unit 1. That is, after the electrical component box D is assembled in the posture shown in FIG. 4, the posture shown in FIG. 4 is reversed and placed on the upper end portion of the partition plate 2.

FIG. 4 shows the substrate storage box cover 11 at the lowest position. The substrate storage box cover 11 is made of a flat metal plate and has a side portion whose periphery is folded upward. An inverter board 15 formed of a printed wiring board is provided on the upper part of the board storage box cover 11. The inverter board 15 has a printed wiring 16. FIG. 4 schematically shows a part of the printed wiring 16. The inverter board 15 is provided with electrical components and a heat sink 13 on the upper surface in the posture shown in FIG.

The electrical component box D has a substrate support 17. The substrate support 17 is a resin molded product and is configured in a frame shape. The inverter board 15 is fitted into the board support 17 and fixed. The substrate support 17 has a fitting portion 17a. The fitting portion 17 a is provided at a position slightly leftward from the central portion in the left-right direction of the substrate support 17, and is provided at a position corresponding to the recessed portion 12 a of the substrate storage box 12.

In the heat sink 13, the shape of the root portion 13b including the flange portion 13c is larger than the shape of the hole of the recessed portion 12a. Therefore, the heat sink 13 does not pass through the hole of the recessed part 12a, but the collar part 13c part is latched by the recessed part 12a. When the inverter board 15 is fitted into the frame of the board support 17, the heat sink 13 is fitted into the recess 12 a from below in FIG. 4 while being provided on the inverter board 15. Thereby, it fixes so that the fin 13a may protrude from the hollow part 12a.

The substrate storage box 12 is fitted into the substrate support 17 to which the inverter substrate 15 is attached from above. In this case, in the substrate storage box 12 shown in FIG. 4, the height H1 of the upper surface of the left portion with respect to the recess 12a is lower than the height H2 of the upper surface of the right portion with respect to the recess 12a.

The inverter board 15 to which the heat sink 13 is attached is fitted and fixed to the board support 17. The board storage box 12 is fitted into the board support 17 to which the inverter board 15 is fixed. As a result, the fins 13 a of the heat sink 13 extend from the recess 12 a of the substrate storage box 12.

The substrate storage box 12 has a ventilation opening 19 and two insertion portions e. As shown in FIG. 4, the ventilation opening 19 is provided on the left side of the substrate storage box 12 and is configured by a large number of small holes. The insertion portion e is provided on the outer surface of the left side portion of the substrate storage box 12 and is provided on both sides in the front-rear direction with respect to the ventilation opening 19. The waterproof board 20 is attached to the insertion part e. The waterproof plate 20 is made of a metal plate, and is formed so that the central portion on the plate protrudes to the side opposite to the substrate storage box 12. As shown in FIG. 4, the waterproof plate 20 has an opening 20 a formed on one side in the front-rear direction so as to penetrate the waterproof plate 20 in, for example, a rectangular shape.

The waterproof plate 20 is inserted into the insertion portion e of the substrate storage box 12 and attached to the substrate storage box 12. The waterproof plate 20 covers the ventilation opening 19 and the periphery thereof when attached to the substrate storage box 12. In this case, the waterproof board 20 has the opening part 20a. Therefore, the substrate storage box 12 allows outside air to flow from the opening 20 a into the substrate storage box 12 through the ventilation opening 19.

As shown in FIG. 4, the substrate storage box 12 has a plate body that covers the entire surface on the side opposite to the substrate support 17 in the left portion of the recess 12 a. In addition, the substrate storage box 12 has a plate body that covers about a half in the left-right direction of the surface on the opposite side of the substrate support 17 in the right portion of the recess 12a. And the board | substrate storage box 12 is open about the remaining half of the right side part of the hollow part 12a.

After the inverter board 15 is fitted into the board support 17, the opening on the board support 17 side, in this case the lower surface side, in the board storage box 12 is fitted into the board support 17. The opening on the lower surface side of the substrate storage box 12 is covered with the substrate storage box cover 11 so as to be stored inside the substrate storage box cover 11 together with the substrate support 17. The substrate storage box 12 and the substrate storage box cover 11 are fixed by fitting the peripheral portion at the lower end of the substrate storage box 12 and the side portion that is folded back above the substrate storage box cover 11.

As described above, the substrate storage box 12 and the substrate storage box cover 11 constitute a casing that is an outer shell of the electrical component box D. And the inverter board | substrate 15 with which the electrical component was attached is accommodated in the inside of the electrical component box D. FIG.

A part of the inverter board 15 is exposed from the opening on the right side of the board storage box 12 shown in FIG. On the other hand, the remaining portion of the inverter board 15 is covered with the board support 17 and the board storage box 12. Further, the heat sink 13 is exposed from the recess 12a.

In the posture of FIG. 4, the heat sink 13 has the flange portion 13 c pressed against the fitting portion 17 a of the substrate support 17. Then, the peripheral edge of the recess 12 a of the substrate storage box 12 is placed on the substrate support 17. In this state, when the electric component box D is turned upside down so as to be attached to the upper end portion of the partition plate 2, the heat sink 13 is placed around the recessed portion 12 a of the substrate storage box 12 through the fitting portion 17 a of the substrate support 17. It will be supported by the edge.

Here, the inside of the electrical component box D on the left side from the heat sink 13 is referred to as “first storage chamber Da”, and the inside of the electrical component box D on the right side from the heat sink 13 is referred to as “second storage chamber Db”.
The electrical component box D includes a substrate storage box 12 made of a metal plate and a substrate storage box cover 11. Moreover, the heat sink 13 is comprised with the metal plate. Therefore, the first storage chamber Da is a space surrounded by a metal plate. Therefore, among the electrical components mounted on the inverter board 15, the electrical components located in the first storage chamber Da are arranged in a substantially sealed space surrounded by the metal plate. On the other hand, the upper half of the substrate storage box 12 is opened in the second storage chamber Db. Therefore, among the electrical components mounted on the inverter board 15, the electrical components located in the second storage chamber Db are arranged in a space in which a part thereof is opened.

FIG. 5 is a perspective view showing an internal state of the electrical component box D with the electrical component box D turned over and the substrate storage box 12 removed. In other words, FIG. 5 shows a state in which the inverter board 15 is housed and fitted in the board support 17. And the electrical component box D is completed by attaching the board | substrate storage box 12 and the board | substrate storage box cover 11 so that it may pinch | interpose from the up-down direction with respect to the state of FIG.

Hereinafter, electrical components mounted on the inverter board 15 will be described with reference to FIGS. 4 and 5.
The inverter board 15 has three inductances 22. The three inductances 22 are mounted in a line on the left side in FIGS. 4 and 5. The inductance 22 is also referred to as a boost choke coil. All of the three inductances 22 generate heat and become high temperature during the air conditioning operation. Moreover, since each inductance 22 is a high frequency switching part, it becomes a high noise generation source. In this case, the inductance 22 is the first electrical component that becomes high temperature during the air conditioning operation. The inductance 22 that is the first electric component is disposed in the first storage chamber Da.

As shown in FIG. 4, the inverter board 15 includes three switching elements 23 and three diodes 24. The switching element 23 is, for example, a PFC MOSFET or IGBT, that is, a field effect transistor, and is also referred to as a boosting power element. The three switching elements 23 and the three diodes 24 are arranged side by side on the left side of the inverter board 15 in the left-right direction, that is, on the right side of the inductance 22 and on the front side of the inverter board 15. Yes.

The inverter board 15 has a diode bridge 25 and an IPM (intelligent power module) 26. The IPM 26 is also referred to as a power supply module. The diode bridge 25 and the IPM 26 are provided behind the switching element 23 and the diode 24 and arranged side by side.

The switching element 23, the diode 24, the diode bridge 25, and the IPM 26 are first electrical components that are heated at the time of the air conditioning operation because they generate a large amount of heat during the air conditioning operation. The heat sink 13 is provided in contact with the switching element 23, the diode 24, the diode bridge 25, and the IPM 26 that are the first electrical components. Thereby, heat generated in the switching element 23, the diode 24, the diode bridge 25, and the IPM 26 is radiated through the heat sink 13.

The heat sink 13 is attached as follows. That is, the root portion 13 b is disposed on the switching element 23, the diode 24, the diode bridge 25, and the IPM 26. Thereafter, the fin 13 a is passed inside the fitting portion 17 a of the substrate support 17. Then, the flange portion 13 c is locked around the fitting portion 17 a of the substrate support 17 and supported by the peripheral portion of the recess portion 12 a of the substrate storage box 12. Thereby, the position of the heat sink 13 is fixed.

The inverter board 15 has a plurality of electrolytic capacitors 27, a plurality of noise filters 28, a plurality of large-scale integrated circuits, resistors, lead wire terminal connections, and the like. The electrolytic capacitor 27 generates a small amount of heat accompanying the air conditioning operation and maintains a relatively low temperature. In this case, the electrolytic capacitor 27, the noise filter 28, and the like are second electrical components that generate little heat during the air conditioning operation. These second electrical components are disposed in the second storage chamber Db.

Each electric component provided on the inverter board 15 constitutes an interleaved PFC (Power Factor Control) circuit having a plurality of booster circuits. The interleaved PFC circuit is used as a power factor correction circuit that improves the power factor on the input side. The booster circuit includes an inductance 22, a switching element 23, and a diode 24. The interleaved PFC circuit operates by making the conduction timings of the switching elements 23 of the booster circuits different from each other. As a result, the current load on each circuit is reduced, and as a result, the components can be downsized.

In the present embodiment, the inverter board 15 has three boosting choke coils that constitute the inductance 22, three switching elements 23 as boosting power elements, and three diodes 24. Three boosting chokes, three switching elements 23, and three diodes 24 constitute three boosting circuits. The compressor 7 and the blower 5 are driven and controlled by a DC voltage controlled by the three booster circuits of the inverter board 15.

As described above, the inverter board 15 has an interleaved PFC circuit. The inverter board 15 is accommodated in the electrical component box D. The inductance 22 is a first electrical component that becomes high temperature during the air conditioning operation, and is disposed in the first storage chamber Da. In this case, the inside of the first storage chamber Da becomes a high temperature portion having a relatively high temperature due to heat generated by the first electrical component. The first storage chamber Da is disposed on the heat exchange chamber 6 side. In addition, the second electrical component that generates less heat during the air conditioning operation, such as the electrolytic capacitor 27 and the noise filter 28, is disposed in the second storage chamber Db. In this case, the inside of the second storage chamber Db is a low-temperature part whose temperature is lower than that of the first storage chamber Da. The second storage chamber Db is disposed on the machine room 10 side.

The heat sink 13 is provided between the first storage chamber Da and the second storage chamber Db, that is, between the high temperature portion and the low temperature portion. As shown in FIG. 1, the heat sink 13 is provided on the heat exchange chamber 6 side with respect to the partition plate 2.

When the air conditioning operation is started, the blower 5 provided in the heat exchange chamber 6 is driven. Then, the outside air passes through the outdoor heat exchanger 4 and is sucked into the outdoor unit 1, and after heat exchange, is discharged to the outside of the outdoor unit 1. At that time, a part of the air introduced into the heat exchange chamber 6 passes through the ventilation opening 19 from the opening 20a of the waterproof plate 20 through the ventilation opening 19 as shown by solid line arrows in FIG. Flow into.

At this time, the inductance 22 that has become hot due to the air conditioning operation is efficiently cooled by the outside air flowing into the first storage chamber Da. The air that has cooled the inductance 22 collides with the heat sink 13, flows along the heat sink 13, and flows out of the electrical component box D. At this time, as indicated by broken line arrows in FIG. 6, the outside air that has flowed into the first storage chamber Da is inhibited by the heat sink 13, and thus hardly flows to the second storage chamber Db side.

In the second storage chamber Db, an electrolytic capacitor 27 and the like, which are second electrical components that generate little heat during the air conditioning operation, are stored. Therefore, active cooling in the second storage chamber Db is not necessary. Moreover, the second storage chamber Db is naturally radiated because about half of the substrate storage box 12 covering the second storage chamber Db is opened. Furthermore, since the heat sink 13 is provided between the first storage chamber Da and the second storage chamber Db, the air on the first storage chamber Da side that becomes high temperature flows into the second storage chamber Db side. Can be suppressed. Thereby, the temperature rise in the 2nd storage chamber Db can be suppressed.

The heat generating components such as the switching element 23, the diode 24, the diode bridge 25, and the IPM 26 that become high temperature during the air-conditioning operation are provided at a substantially central portion of the inverter board 15. The heat sink 13 is provided in contact with the heat generating component which is the first electric component. In addition, the inductance 22 that generates a large amount of heat among the first electrical components that are heat generating components is provided on the heat exchange chamber 6 side with respect to the heat sink 13. On the other hand, the inverter electrolytic capacitor 27 is provided on the opposite side of the inductance 22 via the heat sink 13 in order to avoid the influence of heat generation of the inductance 22.

The inverter board 15 on which the interleaved PFC circuit is mounted can be mounted with an inductance 22 that is lighter in weight than the reactor instead of the heavy reactor disposed outside the board in the conventional circuit. However, the inductance 22 generates a large amount of heat during air conditioning operation. Therefore, when the inverter electrolytic capacitor 27 is provided in the vicinity of the inductance 22, the inverter electrolytic capacitor 27 is easily affected by the heat of the inductance 22. The life of the inverter electrolytic capacitor 27 is related to the life of the interleaved PFC circuit. Therefore, if the inverter electrolytic capacitor 27 is provided in the vicinity of the inductance 22 and the inverter electrolytic capacitor 27 is greatly affected by the heat of the inductance 22, the reliability of the interleaved PFC circuit is lowered.

In the present embodiment, the inductance 22 serving as the first electrical component is provided in the first storage chamber Da on the heat exchange chamber 6 side. Therefore, the inductance 22 is cooled by the wind generated by the blower 5. The electrolytic capacitor 27 is provided in the second storage chamber Db on the opposite side of the inductance 22 with respect to the heat sink 13. Thereby, the temperature rise of the electrical component on the inverter board | substrate 15 can be suppressed with sufficient balance.

As shown in FIG. 7, when it rains, raindrops are sucked into the outdoor unit 1 together with the outside air. Raindrops sucked into the outdoor unit 1 adhere to the outdoor heat exchanger 4 and the blower 5 and are then discharged to the outside. At that time, some of the raindrops may be splashed around by the blower 5 and fall on the electrical component box D, the partition plate 2 or the like.

In the electrical component box D, since many electrical components are stored together with the inverter board 15, it is necessary to prevent raindrops from entering. Here, in this embodiment, what protrudes from the partition plate 2 toward the heat exchange chamber 6 is the first storage chamber Da and the heat sink 13, and the second storage chamber Db does not protrude. Therefore, the first storage chamber Da protruding from the partition plate 2 to the heat exchange chamber 6 side prevents raindrops from entering as follows.

In the electrical component box D, the first storage chamber Da is configured to be substantially hermetically covered with a metal plate. Therefore, raindrops from the outer peripheral surface are prevented from entering the first storage chamber Da. In this case, the ventilation opening 19 provided on the heat exchange chamber 6 side allows the outside air to enter the electrical component box D. However, since the ventilation opening 19 is covered with the waterproof plate 20, the intrusion of raindrops from the outside of the ventilation opening 19 is suppressed.

As shown also in FIG. 8, the fin 13a of the heat sink 13 is exposed from the hollow part 12a of the electrical component box D. As shown in FIG. In this case, there is no problem even if raindrops scattered from the blower 5 fall on the fins 13 a of the heat sink 13. On the contrary, the fins 13a are efficiently cooled, and the heat dissipation effect can be increased.

Since the root portion 13b of the heat sink 13 is in contact with electrical components such as the switching element 23, the diode 24, the diode bridge 25, and the IPM 26, it is necessary to prevent raindrops from falling on the root portion 13b. In this case, the heat sink 13 is located in the recess 12 a of the electrical component box D. Moreover, although the fin 13a is exposed from the hollow part 12a, the root part 13b is covered with the hollow part 12a. For this reason, even if raindrops are scattered from the blower 5, it is difficult to reach the inside of the recessed portion 12a of the electrical component box D, and therefore no major problem occurs.

The tips of the fins 13a of the heat sink 13 protrude downward from the lower surface of the first storage chamber Da. Therefore, the outside air led from the blower 5 and raindrops scattered from the blower 5 are likely to adhere to the fins 13a. As a result, the heat dissipation action of the heat sink 13 is promoted.

In the substrate storage box 12, the peripheral edge of the recess 12 a supports the flange 13 c of the heat sink 13. For this reason, a direct load by the heat sink 13 is not applied to the inverter board 15.

The inverter board 15 equipped with an interleaved PFC circuit has heavy parts such as an electrolytic capacitor 27 and an inductance 22. Therefore, when the electrical component box D is installed in the outdoor unit 1, a load is applied to the inverter board 15. In the present embodiment, the heat sink 13 is supported not by the inverter board 15 but by the constituent members of the electrical component box D. And the load by the weight of the heat sink 13 is reduced to the inverter board | substrate 15, As a result, the load concerning the inverter board | substrate 15 can be reduced significantly.

The inductance 22, the coil, the capacitor, and the like provided in the first storage chamber Da are high noise generation sources, that is, high noise portions in the high frequency switching portion. On the other hand, the electrolytic capacitor 27, the noise filter 28, and the like provided in the second storage chamber Db are bottom noise portions and need to be arranged at positions that are not affected by the high noise portion.

In this case, the first storage chamber Da is surrounded by a substrate storage box 12 and a substrate storage box cover 11 made of a metal plate, and a heat sink 13 made of a metal plate. That is, the high frequency switching component such as the inductance 22 provided in the first storage chamber Da is surrounded by a metal material except for the inverter board 15. Therefore, high-frequency noise generated from high-frequency switching components such as the inductance 22 is blocked by the surrounding metal material. As a result, the noise that propagates to the power supply terminal of the inverter board 15, which is so-called EMC noise (electromagnetic compatibility), can be reduced as much as possible so as to satisfy the regulations.

As mentioned above, although one embodiment was described, the above-mentioned embodiment is shown as an example and is not intending limiting the range of an embodiment. The novel embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Claims

A heat exchange chamber provided with a blower and an outdoor heat exchanger;
A machine room with a compressor;
A partition plate that is provided upright with respect to a bottom plate that constitutes a bottom of the heat exchange chamber and the machine room, and partitions the heat exchange chamber and the machine room;
An electrical component box provided above the partition plate and straddling the machine room and the heat exchange chamber;
Inside the electric parts box, it has a plurality of electrical parts, and among the plurality of electrical parts, the first electrical part that becomes high temperature during the air conditioning operation is arranged on the heat exchange chamber side, and generates heat during the air conditioning operation. An inverter board in which few second electrical components are arranged on the machine room side;
A heat sink provided between the first electrical component and the second electrical component on the heat exchange chamber side;
An air conditioner outdoor unit comprising:
The outdoor unit for an air conditioner according to claim 1, wherein the first electric component is an inductance that has a plurality of booster circuits and constitutes an interleaved PFC circuit provided on the inverter board.
The outdoor unit for an air conditioner according to claim 1, wherein the second electric component is a capacitor having a plurality of boosting circuits and constituting an interleaved PFC circuit provided on the inverter board.
The outdoor unit of an air conditioner according to claim 1, wherein the heat sink is in contact with the first electric component.
The first electric component side outside the electric component box has an opening for guiding a part of the wind generated by the action of the blower into the electric component box and prevents water from entering the electric component box. The outdoor unit for an air conditioner according to claim 1, further comprising a waterproof plate.
The electrical component box has a recess formed in a part of its lower surface,
The outdoor unit of an air conditioner according to claim 1, wherein the heat sink includes a root portion covered with the depression and a fin protruding downward from the depression.
The outdoor unit of an air conditioner according to claim 1, wherein the tip of the fin is positioned below the first electric component.
The outdoor unit of an air conditioner according to claim 1, wherein the electrical component box includes a substrate storage box that is configured of a metal plate and supports the root portion in a posture in which the fins of the heat sink protrude downward.
The outdoor unit of an air conditioner according to claim 8, wherein the substrate storage box and the heat sink surround a high noise component that performs high frequency switching during air conditioning operation among the electrical components.