WO2005031219A1 - Outdoor unit of air conditioner - Google Patents

Abstract

An outdoor unit of an air conditioner, comprising a heat sink (10) for cooling an electrical part (C2) with large heating value projected from the side plate of an electric part box (9) installed in a machine room (4) in a casing (1), a cooling duct (12) installed along the side plate to cover the heat sink (10), having opening parts (12a) and (12b) in a horizontal partitioning plate (2) and a casing bottom plate, leading outside air from the opening part (12b) in the casing bottom plate therein according to the operation of a blower (6) to heat-exchange the outside air with the heat sink (10), and then leading the heat-exchanged air from the opening (12a) in the horizontal partitioning plate to the outside thereof, and a vent hole (13) formed in the side plate of the electric part box (9), leading the air in the electric part box (9) therein, and exhausting the air into the cooling duct (12).

Description

 Specification

 Outdoor unit of air conditioner

 Technical field

 [0001] The present invention provides an air conditioner that divides the inside of a housing into upper and lower sections through a horizontal partition plate, an upper part is a heat exchange chamber, a lower part is a machine room, and the machine room includes an electrical component box for housing electrical components and the like. The present invention relates to an outdoor unit of a machine, and particularly to a cooling structure in an electrical component box. Background art

 [0002] For example, Japanese Patent Application Laid-Open No. 2001-201108 discloses an outdoor unit of a medium-sized air conditioner for a medium-sized building, in which the inside of a housing is vertically divided via a horizontal partition plate, and the upper part is heated. An example is disclosed in which a heat exchange chamber is provided on the secondary side of the heat exchanger, in which a blower is arranged so as to face the heat exchanger, and a machine room in which a compressor and the like are arranged below is provided.

 [0003] It is a general configuration that the machine room is provided with an electrical component box for housing electrical components and the like. The electrical components include, for example, a circuit board on which control electronic components having a relatively small heat value are mounted, a circuit board having a relatively large heat value such as an inverter circuit, and an electric component having an extremely large heat value such as a reactor. And so on. Disclosure of the invention

 [0004] In such an outdoor unit of an air conditioner, particularly, the machine room has a substantially hermetic structure so that the operating noise of the compressor does not leak to the outside as much as possible. As a result, there is not enough cooling in the machine room, where the air flow is very low. In particular, the electrical components generate heat in the electrical component box, and the temperature in the electrical component box rises extremely as it is, which may adversely affect the electrical components.

 [0005] Therefore, various cooling structures for the inside of the electrical component box have been adopted. For example, there is a structure in which an opening for taking in outside air is provided on a side plate constituting a housing which is an outdoor unit main body to reduce the temperature of a machine room. Alternatively, the electrical component box side plate is also used as a side plate of the housing, and an opening for taking in outside air is provided in the electrical component box side plate to reduce the temperature inside the electrical component box.

[0006] However, an opening is provided in the above-described housing side plate, or an opening is formed in the electrical component box side plate. Although the temperature can be reduced by providing each of them, if outside air is taken in through these openings, water droplets such as rainwater and snow enter the inside together with the outside air.

 [0007] The compressor arranged in the machine room is provided with a terminal for making an electrical connection to cords, and if this terminal gets wet with water droplets, there is a risk of occurrence of a short circuit accident or the like. Of course, if the electrical components in the electrical component box get wet with water droplets, there is a possibility that a similar accident may occur. Therefore, there is a need for an effective, safe and reliable cooling structure! /

 [0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to secure cooling efficiency for the inside of the electrical component box arranged in the machine room and for the electrical components housed therein, and The aim is to provide an outdoor unit of an air conditioner equipped with an effective and safe cooling structure that reliably prevents infiltration and prevents short circuit accidents and the like.

 [0009] The outdoor unit of the air conditioner of the present invention satisfies the above-mentioned object, and comprises a horizontal partition plate for partitioning the inside of the housing up and down, and a heat exchanger formed on an upper portion of the horizontal partition plate. A switching room, a machine room formed in the lower part, and an electrical component box provided in the machine room for housing electrical components and the like, and a side plate force of the electrical component box. A heat sink for cooling the heat sink, and the heat sink is provided along the side plate of the electrical component box where the heat sink protrudes, covers the heat sink, and has openings in the horizontal partition plate and the housing bottom plate. Cooling duct for introducing the outside air from the opening of the body bottom plate and exchanging heat with the heat sink and then deriving the opening force of the horizontal dividing plate, and the air inside the electrical component box provided on the side plate of the electrical component box to conduct air into the cooling duct Through exhaust You and a hole.

 Brief Description of Drawings

 [FIG. 1] FIG. 1 is a schematic sectional view of an outdoor unit of an air conditioner according to Embodiment 1 of the present invention.

 FIG. 2 is a schematic cross-sectional view of an electrical component box according to Embodiment 2 of the present invention and a peripheral portion thereof.

 FIG. 3 is an exploded perspective view of an electrical component box according to Embodiment 3 of the present invention.

 FIG. 4 is a partial cross-sectional view of the auxiliary electrical component box according to the third embodiment.

FIG. 5 is a perspective view of a double structural member according to the third embodiment. FIG. 6 is a schematic sectional view of a main electrical component box according to Embodiment 4 of the present invention.

 FIG. 7 is a perspective view of an assembled electrical component box according to Embodiment 4.

 BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1)

 Hereinafter, Example 1 will be described with reference to FIG. FIG. 1 is a schematic sectional view of an outdoor unit constituting an air conditioner.

 The housing 1 constituting the unit main body of the outdoor unit is provided with a horizontal partition plate 2 at a substantially middle portion in the vertical direction, and the interior of the housing 1 is vertically partitioned by the horizontal partition plate 2. The inside of the upper housing of the horizontal partition 2 is called the heat exchange room 3, and the inside of the lower housing is called the machine room 4.

 [0013] An outdoor heat exchanger 5 is disposed facing at least a part of the side surface of the heat exchange chamber 3 (here, both right and left sides), and an outdoor blower 6 is disposed at the uppermost center of the heat exchange chamber 3. . By the operation of the outdoor blower 6, after the outside air flows through the outdoor heat exchanger 5 and is guided into the heat exchange chamber 3, a ventilation path to be discharged from the outdoor blower 6 to the outside is formed. .

 [0014] In the machine room 4, a gas-liquid separator 7, a compressor 8, and valves and pipes (not shown) are arranged. The compressor 8 and the like are communicated with the outdoor heat exchanger 5 via a refrigerant pipe so as to form a refrigeration cycle, and the refrigerant pipe is extended to an indoor heat exchanger that forms an unillustrated indoor unit.

 [0015] In the machine room 4, an electrical component box 9 accommodating the electrical components C and the like is also arranged along with the compressor 8. As the electrical component C accommodated in the electrical component box 9, for example, an electrical component (circuit board) C1 on which a control electronic component having a relatively small amount of heat is mounted is disposed on the upper side, and the amount of heat generated by the inverter circuit is small. A large electrical component (circuit board) C2 is arranged on the lower side, and an electrical component having an extremely large amount of heat, such as a reactor (not shown), is accommodated here.

In the electrical component C2 such as an inverter circuit, which generates a large amount of heat, a heat sink 10 is attached to the back side of the electrical component C2, and protrudes from the side plate 9a constituting the electrical component box 9. The heat sink 10 is, for example, a plurality of cooling fins having excellent heat radiation properties such as aluminum-yum material and has a predetermined distance in the depth direction of the paper and is provided vertically. The bottom plate 9b of the electrical component box 9 is provided with a hole 11 for introducing air, and a portion la of the housing bottom plate which is intentionally shifted from the hole 11 for introducing outside air (not shown). A hole is provided. A cooling duct 12 is attached along a side plate 9a of the electrical component box 9 from which the heat sink 10 projects. The cooling duct 12 is formed in a U-shaped cross section in plan view, and has an open side opposed to the electrical component box side plate 9a, and a flange provided along an edge thereof has an electrical component box side plate. Mounted and fixed to 9a.

 [0018] The cooling duct 12 covers the heat sink 10 protruding from the electrical component box side plate 9a, and has openings 12a, 12b whose upper and lower ends are respectively provided in the horizontal partition plate 2 and the housing bottom plate la. Fit into. Therefore, the heat exchange chamber 3 communicates with the outside of the housing bottom plate la via the cooling duct 12.

 [0019] On the side plate 9a of the electrical component box 9, a vent hole 13 is provided at a portion facing the upper part of the cooling duct 12, and the inside of the electrical component box 9 and the inside of the cooling duct 12 are connected through the vent hole 13. Passed through. An opening 14 projecting toward the cooling duct 12 is provided along the peripheral end of the ventilation hole 13, and the tip of the opening 14 is covered with a hood member 15 at a predetermined interval.

 Therefore, the air guided from the inside of the electrical component box 9 to the ventilation hole 13 is guided to the mouth 14 provided along the peripheral end of the ventilation hole 13 and is derived from the electrical component box 9. Then, it flows through the gap between the tip of the mouth 14 and the hood member 15, flows along the gap between the hood member 15 and the side panel 9a of the electrical component box, and is finally guided into the cooling duct 12. .

 [0021] An outdoor unit of the air conditioner configured as described above. When an operation command signal is input, the compressor 8 is driven to drive the outdoor heat exchanger 5, the valves, the gas-liquid separator 7, and the indoor unit. The refrigerant is guided to the indoor heat exchanger, and the refrigeration cycle is performed. At the same time, the outdoor blower 6 is driven to suck outside air into the heat exchange chamber 3. The outside air flows through the outdoor heat exchanger 5 to exchange heat, and is further exhausted to the outside via the outdoor blower 6.

 [0022] Due to the air blowing action of the outdoor blower 6, the heat exchange chamber 3 becomes a negative pressure, the influence of which is exerted on the cooling duct 12 communicating with the heat exchange chamber 3, and the inside of the cooling duct 12 also becomes a negative pressure. Outside air outside the housing bottom plate la is sucked in from the housing bottom plate opening 12b of the cooling duct 12 and flows through the cooling duct 12 to the heat exchange chamber 3 through the opening 12a provided in the horizontal partition plate 2.

The outside air contacts the heat sink 10 while flowing through the cooling duct 12 and exchanges heat with each other. . Heat transmitted from the electrical component C2, which generates a large amount of heat, such as an inverter circuit, to the heat sink 10 is radiated to the outside air flowing through the cooling duct 12, and the electrical component C2 is cooled together with the heat sink 10. The release of the heat of the electrical component C2 into the electrical component box 9 and the machine room 4 suppresses these temperature rises almost infrequently.

 [0024] Since the cooling duct 12 is attached along the side plate 9a of the electrical component box 9, outside air flowing through the cooling duct 12 is guided along the electrical component box side plate 9a. Therefore, a part of the electrical component box 9 (the side plate 9a) facing the cooling duct 12 is cooled by the outside air.

 Further, when the outdoor blower 6 is driven and the pressure inside the cooling duct 12 becomes negative, the inside of the electrical component box 9 communicating with the cooling duct 12 via the ventilation hole 13 also becomes negative. Due to the influence, air in the machine room 4 is introduced into the electrical component box 9 from the air introduction hole 11 provided in the bottom plate 9b of the electrical component box 9. The air inside the machine room 4 is the outside air guided through an outside air intake hole (not shown) provided on the bottom plate la of the housing.In practice, fresh and low-temperature outside air is introduced into the electrical component box 9. become.

 [0026] The outside air introduced into the electrical component box 9 from the air introduction hole 11 of the electrical component box bottom plate 9b directly contacts the electrical components C2 and C1 housed in the electrical component box 9, and cools them. I do. The outside air whose temperature has been increased by cooling is led out of a ventilation hole 13 provided at the upper part of the electrical component box 9, guided by the mouth 14 and the hood member 15 and guided into the cooling duct 12.

 As described above, the air after cooling the heat sink 10 flows through the cooling duct 12, and the air guided through the ventilation holes 13 joins. The combined air is guided to the heat exchange chamber 3 and further exhausted to the outside by the action of the outdoor blower 6.

 [0028] In this manner, the heat sink 10 attached to the electrical component C2, such as the inverter circuit, generates a large amount of heat. The electrical component box side plate 9a facing the cooling duct 12 is cooled by the outside air flowing through the cooling duct 12. The electrical components C2 and C1 in the electrical component box 9 are directly cooled by the cooling air guided into the box 9 from the air introduction holes 11 in the electrical component box bottom plate 9b.

After cooling the heat sink 10, the electrical component box side plate 9 a, and the electrical components C 2, C 1, the outside air is exhausted outside through the heat exchange chamber 4, and the heat sink 10, the electrical component box side plate 9 a, and the electrical component Fresh and cool outside air is always led to the parts C2 and C1. But Thus, the rise in the internal temperature of the electrical component box 9 is reliably suppressed, effective cooling of the electrical components C2 and C1 is achieved, and the cooling efficiency is greatly improved.

 [0030] Further, since outside air outside the housing bottom plate la is introduced into the cooling duct 12, the gap force between the housing bottom plate la and the housing installation surface G is also cooled regardless of any heavy rain. The amount of water droplets reaching the housing bottom plate opening 12b of the duct 12 is small, and it is difficult to imagine that this force also causes water droplets to enter the cooling duct 12.

 [0031] Suppose a case where water droplets such as rainwater enter the cooling duct 12 by being mixed into the outside air. Most of the water droplets strike the heat sink 10 immediately after entering the cooling duct 12 and cannot enter any further. Even if the water passes through the heat sink 10, the water droplets are led out to the heat exchange chamber 3 from the upper opening 12 a of the cooling duct provided in the horizontal partition plate 2. Since the outdoor heat exchange 5 disposed in the heat exchange chamber 3 has a configuration that does not hinder the rainwater itself, even if there is any water droplet entering the heat exchange chamber 3 from the cooling duct 12. There is no hindrance.

 Depending on the situation, it is conceivable that a partial force of water droplets passing through the heat sink 10 penetrates into the gap between the hood member 15 and the electrical component box side plate 9a above the cooling duct 12. However, the water droplets that have entered the gap with the hood member 15 immediately collide with the mouth 14 projecting along the peripheral end of the ventilation hole 13, and further intrusion is prevented. The mouth 14 has a function of a so-called baffle plate, and no water droplet reaches the vent hole 13. Naturally, no water droplets enter the electrical component box 9 from the ventilation holes 13 under negative pressure conditions.

 [0033] Outside air is also guided from the air introduction hole 11 of the electrical component box bottom plate 9b. However, as described above, the air introduction hole 11 is spaced apart from the outside air intake hole provided in the housing bottom plate la. Position. In the unlikely event that water droplets enter the housing through the outside air intake hole, no water droplets reach the air introduction hole 11 from the outside air intake hole, and the electrical component box 9 passes through the air introduction hole 11. Since it does not penetrate into the interior, short circuit accidents of the electrical components CI and C2 can be reliably prevented.

 (Example 2)

Next, a second embodiment will be described with reference to FIG. Basically, the overall configuration of the outdoor unit is the same as that described above with reference to Fig. 1, so new description is omitted by applying this figure. To do. FIG. 2 is an enlarged schematic cross-sectional view of the electrical component box 9 and its peripheral portion.

An electrical component box 9 for housing electrical components CI, C2 and the like is arranged in the machine room 4. A heat sink 10 protrudes from the electrical component C2, which generates a large amount of heat, and projects from the electrical component box side plate 9a. An air introduction hole 11 is provided in the electric component box bottom plate 9b, and a cooling duct 12 is attached along the side plate 9a from which the heat sink 10 projects.

[0036] The cooling duct 12 covers the heat sink 10, and upper and lower ends are fitted into the openings 12a and 12b of the horizontal partition plate 2 and the housing bottom plate 1a. A ventilation hole 13 is provided in the upper part of the side panel 9a of the electrical component box, and a mouth 14 is provided along a peripheral end of the ventilation hole 13, and a tip of the mouth 14 is covered by a hood member 15 with a gap. Has been done. The above is exactly the same as the configuration described above with reference to FIG.

 Here, a side plate 9 a of the electrical component box 9 provided with the ventilation holes 13 and a partition plate 20 for partitioning the inside of the electrical component box 9 are provided, and the partition plate 20 communicates with the inside of the electrical component box 9. It is characterized in that a plurality of guide holes 21 communicating with the pores 13 are provided. Many guide holes 21 are provided in the vicinity of the electrical component C2 that generates a large amount of heat, such as an inverter circuit.

 The partition plate 20 is provided substantially parallel to the side plate 9a within the electrical component box 9 at a predetermined narrow distance from the side plate 9a. The upper end 20a of the partition plate 20 is bent at a position above the ventilation hole 13, and the bent edge is fixed to the side plate 9a. The lower end portion 20b of the partition plate 20 is bent at a position near the electric component box bottom plate 9b, and the bent edge is fixed to the side plate 9a. Further, the left and right sides of the partition plate 20 are bent, respectively, and the bent edges are fixed to the side plate 9a.

 [0038] Some electrical components CI and C2 are directly attached to the partition plate 20, or are attached through the partition plate 20. Therefore, the partition plate 20 forms a substantially closed space D with respect to the side plate 9a.

 The interior of the electrical component box 9 and the substantially closed space D formed between the partition plate 20 and the side plate 9a are communicated through the guide holes 21. Further, since the substantially closed space D and the inside of the cooling duct 12 are communicated through the ventilation holes 13, the inside of the electrical component box 9 is communicated with the inside of the cooling duct 12 through the substantially closed space D. .

In such a configuration, between the inside of the electrical component box 9 and the cooling duct 12, the partition plate 20 and the side The substantially closed space D formed by the plate 9a is interposed as an air layer, and a heat shielding effect on the cooling duct 12 can be obtained from inside the electrical component box 9.

 [0041] Since many guide holes 21 are provided in the partition plate 20 in the vicinity of the electrical component C2 that generates a large amount of heat, the cooling efficiency for the electrical component C2 can be improved. On the other hand, the air in the electrical component box 9 is smoothly guided to the cooling duct 12 through the guide hole 21, the substantially enclosed space D and the ventilation hole 13, and the temperature rise inside the electrical component box 9 is reliably suppressed. You.

 (Example 3)

 Next, a third embodiment will be described with reference to FIGS. Basically, the overall configuration of the outdoor unit is the same as that described above with reference to FIG. 1, and therefore, a new description will be omitted here by applying the same figure. 3 is an exploded perspective view of the electrical component box 9, FIG. 4 is a schematic sectional view of a double structural member 30 constituting a part thereof, and FIG. 5 is a perspective view of the double structural member 30.

 In FIG. 3, the electrical component box 9 is viewed from the front side, and the ventilation holes 13 provided in the side plate 9a of the electrical component box 9 are illustrated. In other words, they are omitted. As the configuration of the cooling duct 12 itself, the configuration described above with reference to FIG. 1 is applied as it is, and all the description is omitted.

 The electrical component box 9 includes only a main electrical component box 9M that accommodates the electrical component C1 having a small calorific value or the electrical component C2 having a large calorific value, and the electrical component C3 having an extremely large calorific value such as a reactor. It consists of an auxiliary electrical component box 9N to be accommodated.

 An opening 25 described later is provided on one side of the main electrical component box 9M, the electrical components CI and C2 are accommodated in the remaining space, and a vent hole 13 is provided in a predetermined portion. The opening 25 provided in the main electrical component box 9M is closed by a double structural member 30, and the auxiliary electrical component box 9N is mounted via the double structural member 30.

 The auxiliary electrical component box 9N is formed in a substantially U-shaped cross section in plan view, and the upper end opening is closed by a top plate 9e that is bent at the upper end of the main electrical component box 9M. The lower end is provided with a bottom plate 9f, and flange portions 9h provided along the left and right side edges are attached to the double structural member 30.

[0047] As described above, the auxiliary electrical component box 9N is a box attached separately from the main electrical component box 9M, and has a substantially hermetic structure. Will not affect the interior of the main electrical components box 9M.

 [0048] The left and right sides of the auxiliary electrical component box 9N have a so-called armor structure, so that ventilation to the inside is ensured. There is no risk that the electric component C3 itself, which does not allow the heat radiated from the electric component C3 housed therein to flow into the auxiliary electric component box 9N, has a thermal effect on the electric component C3 itself. It is unlikely that raindrops or other water droplets will be applied to the auxiliary electrical component box 9N. Force Even if it gets wet, there is no danger of it penetrating into the inside of the door through the gap.

 As shown in FIGS. 3 to 5, the double structural member 30 includes a first plate 31 directly attached to the main electrical component box side plate 9a, and a predetermined gap between the first plate 31 and the first plate 31. And a second plate body 32 that is superimposed on the other. The first plate 31 closes an opening 25 provided in the main electrical component box 9M, and the second plate 32 is located at a position protruding into the main electrical component box 9M. An electrical component C1 similar to the electrical component C1 housed in the main electrical component box 9M is mounted on the inner surface of the main electrical component box 9M of the second plate 32.

 [0050] An air layer is formed between the first plate 31 and the second plate 32, which has a heat insulating effect. Therefore, even if the double structural member 30 receives heat from the electrical component C3, which generates extremely large amounts of heat, such as the reactor inside the auxiliary electrical component box 9N, the air layer exhibits the heat insulating effect and enters the main electrical component box 9M. Heat transfer to the electrical component C3 in the main electrical component box 9M has almost no thermal effect.

 [0051] Furthermore, by arranging parts such as the reactor that are relatively unlikely to fail in the auxiliary electrical component box 9N, in addition to the heat treatment problem, the main electrical component box 9M can be reduced in space and the degree of freedom in component layout can be improved. Is improved.

 (Example 4)

 Next, a fourth embodiment will be described with reference to FIGS. Basically, the entire configuration of the outdoor unit is the same as that described above with reference to FIG. 1, and the configuration in which the partition plate 20 is provided at a predetermined interval from the electrical component box side plate 9a is first described in FIG. It is the same as that described in Example 2), and the fact that the electrical component box 9 is composed of the main electrical component box 9M and the auxiliary electrical component box 9N provided with the double structural member 30 has already been described in FIGS. This is the same as that described in (Embodiment 3). Here, the same drawings are applied, and the new description is omitted.

FIG. 6 is a perspective view of the assembled electrical component box 9, and FIG. 7 is a cross-sectional view of the main electrical component box 9 M. FIG. FIG. 6 is a sectional view of the main electrical component box 9M, and FIG. 7 is a perspective view of the assembled electrical component box 9.

 A first plate 31 constituting the double structural member 30 is provided on the same surface as the side plate 9a of the main electrical component box 9M, and a second plate 32 is provided on the same surface as the partition plate 20. The distance between the side plate 9a and the partition plate 20 is the same as the distance between the first plate 31 and the second plate 32, and the other end of the side plate 9a and the first plate 31 The edges are closely connected to each other, and the edges of the partition plate 20 and the second plate 32 are closely connected to each other.

 [0055] Therefore, the gap D formed between the first plate 31 and the second plate 32 is communicated with the gap D (substantially closed space) between the side plate 9a and the partition plate 20. As described above, the gap D (substantially closed space) between the side plate 9a and the partition plate 20 is communicated with the ventilation hole 13, so that the first plate 31 and the second plate 31 constituting the double structural member 30 are formed. The gap D between the plate members 32 is communicated with the ventilation hole 13.

 [0056] With such a configuration, the double structural member 30 receives heat radiation from the electrical component C3, which generates an extremely large amount of heat, such as the reactor in the auxiliary electrical component box 9N, and the air formed in these gaps D The layer forms a heat shield, and the air in the air layer increases in temperature. Then, the air whose temperature has risen is guided to the gap D between the side plate 9a and the partition plate 20, and further guided to the cooling dart 12 through the ventilation hole 13 to be exhausted to the outside.

 [0057] The air layer of the double structural member 30 is partially filled with the outside air guided into the main electrical component box 9M, and the temperature rise is suppressed very efficiently. Auxiliary electrical component box 9N accommodated in electrical component that generates a very large amount of heat The heat radiation from C3 does not affect the interior of the main electrical component box 9M, and heat transfer is minimized. .

 (Modification)

 Next, a modified example will be described with reference to FIGS.

 [0059] Basically, the overall configuration of the outdoor unit is the same as that described above with reference to Fig. 1. In this modification, two inverter-driven compressors 8a individually operated and controlled in the machine room 4 , 8b are arranged.

 The configuration in which the partition plate 20 is provided at a predetermined interval from the electrical component box side plate 9a has been described with reference to FIG.

This is the same as that described in (Embodiment 2), and the electrical component box 9 has a double structure with the main electrical component box 9M. The configuration including the auxiliary electrical component box 9N including the structural member 30 is the same as that described above with reference to FIGS. 3 to 5 (Embodiment 3). The gap D formed between the first plate 31 and the second plate 32 is communicated with the gap D (substantially closed space) between the side plate 9a and the partition plate 20 as shown in FIGS. This is the same as that described in FIG. 7 (Embodiment 4).

[0061] Here, the same drawings are applied, new description is omitted, and only different points will be described.

[0062] In the machine room, two compressors 8a, 8b are arranged, and these are driven by inverters C2a, C2b arranged at the position C2 of the main electrical component box 9, respectively. The inverters C2a and C2b are horizontally arranged side by side in a positional relationship corresponding to the compressors 8a and 8b respectively driven, and the heat sinks 10 are integrally provided on the inverters C2a and C2b, respectively.

 [0063] With such a configuration, for example, the lower inverter C2a is arranged in comparison with the case where the inverter C2a is arranged vertically and the inverter C2b is arranged vertically above the inverter C2a. The heat generated from the heat sink 10 protruding from the heat sink 10 does not interfere with the heat sink 10 of the upper inverter 2Cb, and both heat sinks 10 are efficiently cooled by the duct 12. Also, since the inverters C2a and C2b are made to correspond to the positional relationship of the compressors 8a and 8b respectively driving them, it is excellent in maintainability in the event of a failure or the like.

 The present invention is not limited to the embodiments described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

 Industrial applicability

[0065] According to the present invention, the cooling efficiency for the electrical components in the electrical component box disposed in the machine room is ensured, and the intrusion of water droplets into the electrical component box is reliably prevented to cause a short circuit accident or the like. In addition, there is an effect that an effective and safe cooling structure can be obtained.

Claims

The scope of the claims  [1] The inside of the housing is divided into upper and lower parts through a horizontal partition plate, the upper part is a heat exchange room where a heat exchanger and a blower are arranged, and the lower part is a machine room where a compressor etc. are arranged. In an outdoor unit of an air conditioner equipped with an electrical component box for housing electrical components, etc.,  A heat sink for cooling electrical components generating a large amount of heat is projected from the side plate constituting the electrical component box,  Along the side plate of the electrical component box on which the heat sink protrudes, the heat sink is covered, and the horizontal partition plate and the housing bottom plate are provided with openings, and the housing bottom plate opening is provided with the operation of the blower. A cooling duct is introduced that introduces outside air from the  An outdoor unit for an air conditioner, characterized in that a side plate of the electrical component box is provided with a ventilation hole for conducting air inside the electrical component box and guiding exhaust air into the cooling duct.  [2] The inside of the housing is divided into upper and lower parts through a horizontal partition plate, the upper part is a heat exchange room where a heat exchanger and a blower are arranged, and the lower part is a machine room where a compressor etc. are arranged. In an outdoor unit of an air conditioner equipped with an electrical component box for housing electrical components, etc.,  A heat sink for cooling electrical components generating a large amount of heat is projected from the side plate constituting the electrical component box,  Along the side plate of the electrical component box on which the heat sink protrudes, the heat sink is covered, and the horizontal partition plate and the housing bottom plate are provided with openings, and the housing bottom plate opening is provided with the operation of the blower. A cooling duct is provided to conduct the outside air, exchange heat between the outside air and the heat sink, and then guide the heat from the horizontal partition plate opening to the heat exchange chamber.  On the side panel of the electrical component box, a ventilation hole is provided for conducting air in the electrical component box and guiding the air into the cooling duct,  A side plate of the electrical component box provided with the ventilation holes and a partition plate for separating the inside of the electrical component box are provided,  An outdoor unit for an air conditioner, wherein a guide hole communicating the inside of the electrical component box with the vent hole is provided in the partition plate. [3] The electrical component box includes a main electrical component box for housing electrical components such as an inverter circuit, It consists of an auxiliary electrical component box that is attached to this main electrical component box and contains only electrical components such as reactors that generate extremely large amounts of heat.  2. The outdoor unit of an air conditioner according to claim 1, wherein a double structural member having an air layer interposed is provided at a position where the main electric component box is attached to the auxiliary electric component box. 4. The outdoor unit for an air conditioner according to claim 3, wherein the air layer of the double structural member communicates with a vent provided in a side plate of the electrical component box. [5] The inside of the housing is divided into upper and lower parts through a horizontal partition plate, the upper part is a heat exchange room where a heat exchanger and a blower are arranged, and the lower part is a machine room where a compressor etc. are arranged. In an outdoor unit of an air conditioner equipped with an electrical component box for housing electrical components, etc.,  A heat sink for cooling electrical components generating a large amount of heat is projected from the side plate constituting the electrical component box, and the heat sink is covered along the side plate of the electrical component box on which the heat sink protrudes. At the same time, the horizontal partition plate and the housing bottom plate are provided with openings, and when the blower is operated, outside air is introduced from the housing bottom plate opening and heat exchange is performed with the heat sink, and then the horizontal partition plate opening force is derived. Provide a cooling duct,  Two compressors are arranged in the machine room, and the electrical components generating a large amount of heat are two inverter devices that individually drive the two compressors, which are arranged in parallel in the horizontal direction. An outdoor unit of an air conditioner, characterized in that: