JP2010169393A - Outdoor unit of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve waterproof property of electric components stored in the machine room of an outdoor unit. <P>SOLUTION: The outdoor unit of an air conditioner includes: a heat sink 10 for cooling an electric component C2 with large heating value, the heat sink 10 being projected from a side plate of an electric component box 9 installed in the 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, 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 provided in the side plate of the electric component box 9, leading the air in the electric component box 9 therein, and exhausting the air into the cooling duct 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention divides the inside of the casing up and down via a horizontal dividing plate, the upper part is a heat exchange chamber, the lower part is a machine room, and the outdoor part of an air conditioner equipped with an electrical part box that accommodates electrical parts etc. in the machine room It relates to a unit, and more particularly to a cooling structure in an electrical component box.

  As an outdoor unit in a medium-sized air conditioner for medium-sized buildings, the inside of the housing is partitioned up and down via a horizontal dividing plate, and the upper part is the secondary side of the heat exchanger, facing this heat exchanger. An example in which a heat exchange chamber in which a blower is disposed and a machine room in which a compressor or the like is disposed is provided in the lower part is disclosed (for example, see Patent Document 1).

  And it has become a general structure to provide the electrical component box which accommodates an electrical component etc. in this machine room. Examples of the electrical components include a circuit board on which a control electronic component that generates a relatively small amount of heat generation is mounted, a circuit board that generates a relatively large amount of heat such as an inverter circuit, and an electrical component that generates an extremely large amount of heat such as a reactor. There are a wide variety.

  In addition, other air conditioners are disclosed (for example, see Patent Documents 2 to 5).

JP 2001-201108 A JP 2003-214659 A Japanese Patent Laid-Open No. 07-248133 JP 2001-090996 A CD-ROM of actual application No. 04-032869 (No. 05-090223)

  In such an outdoor unit of an air conditioner, the machine room in particular has a substantially sealed structure so that the operating noise of the compressor does not leak as much as possible. Therefore, there is almost no air flow in the machine room, and the cooling amount for the machine room is insufficient. In particular, the electrical component generates heat in the electrical component box, and if it is left as it is, the temperature in the electrical component box is extremely increased, which may cause a thermal adverse effect on the electrical component.

  Therefore, various cooling structures for the electrical component box are employed. For example, there is a structure in which an opening for taking in outside air is provided on a side plate constituting a casing which is an outdoor unit main body, thereby reducing the temperature of the machine room. Alternatively, there is also a structure in which the electrical component box side plate is also used as the 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 in the electrical component box.

  However, by providing an opening in the case side plate as described above, or by providing an opening in the electrical component box side plate, each temperature drop can be obtained, but if outside air is taken in from these openings, rainwater, snow, etc. Water drops will also enter the interior.

  The compressor disposed in the machine room has a terminal for making an electrical connection with the cords. If this terminal gets wet with water droplets, there is a risk of a short circuit accident or the like. Naturally, if an electrical component in the electrical component box gets wet with water droplets, a similar accident may occur. Therefore, there is a need for an effective, safe and reliable cooling structure that can replace this.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to ensure the cooling efficiency for the interior of the electrical component box disposed in the machine room and the electrical component accommodated, and to prevent the ingress of water droplets. It is an object of the present invention to provide an outdoor unit of an air conditioner having an effective and safe cooling structure that reliably prevents the occurrence of a short circuit accident or the like.

  The outdoor unit of the air conditioner according to the present invention is to satisfy the above-mentioned purpose, and includes a horizontal division plate that divides the inside of the casing up and down, and a heat exchange chamber formed above the horizontal division plate. In order to cool an electrical component having a large calorific value that protrudes from the side plate of the electrical component box, comprising a machine room formed in the lower part and an electrical component box that is provided in the mechanical chamber and accommodates electrical components and the like The heat sink and the side plate of the electrical component box on which the heat sink protrudes are provided to cover the heat sink and have an opening in the horizontal partition plate and the case bottom plate. A cooling duct to be introduced from the opening of the horizontal partition plate after introducing outside air and exchanging heat with the heat sink; and a vent hole provided on a side plate of the electrical component box for conducting air in the electrical component box and exhausting it into the cooling duct The To Bei.

FIG. 1 is a schematic cross-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 and its peripheral portion according to Embodiment 2 of the present invention. FIG. 3 is an exploded perspective view of the electrical component box according to the third embodiment 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 the double structure member according to the third embodiment. FIG. 6 is a schematic cross-sectional view of the main electrical component box according to the fourth embodiment of the present invention. FIG. 7 is a perspective view of the assembled electrical component box according to the fourth embodiment.

Example 1
Hereinafter, Example 1 is demonstrated based on FIG. FIG. 1 is a schematic cross-sectional view of an outdoor unit constituting an air conditioner.

  The casing 1 constituting the unit 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 casing 1 is partitioned vertically by the horizontal partition plate 2. The inside of the upper casing of the horizontal partition plate 2 is called a heat exchange chamber 3 and the inside of the lower casing is called a machine room 4.

  An outdoor heat exchanger 5 is disposed facing at least a part of the side surface (here, the left and right side portions) of the heat exchange chamber 3, and an outdoor fan 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 led into the heat exchange chamber 3, a ventilation path that is discharged from the outdoor blower 6 to the outside is formed.

  In the machine room 4, a gas-liquid separator 7, a compressor 8, valves and piping (not shown), and the like are arranged. These compressors 8 and the like communicate with the outdoor heat exchanger 5 via a refrigerant pipe so as to constitute a refrigeration cycle, and the refrigerant pipe extends to an indoor heat exchanger constituting an indoor unit (not shown).

  An electrical component box 9 that houses the electrical component C and the like together with the compressor 8 is also arranged in the machine room 4. As the electrical component C housed in the electrical component box 9, for example, an electrical component (circuit board) C1 on which a control electronic component with a relatively small amount of heat generation is mounted is arranged on the upper side, and the heat generation amount such as an inverter circuit is large. In addition to the electrical component (circuit board) C2 disposed on the lower side, electrical components such as a reactor (not shown) that generate extremely large amounts of heat are accommodated.

  In the electrical component C2 that generates a large amount of heat, such as an inverter circuit, the heat sink 10 is integrally attached to the back side thereof and protrudes from the side plate 9a constituting the electrical component box 9. The heat sink 10 is a plurality of cooling fins made of a material having excellent heat dissipation characteristics, such as an aluminum material, and is provided in the vertical direction with a predetermined interval in the depth direction of the paper surface.

  An air introduction hole 11 is provided in the bottom plate 9b of the electrical component box 9, and an outside air intake hole (not shown) is provided in the housing bottom plate 1a portion intentionally shifted from the air introduction hole 11. It is done. Moreover, the cooling duct 12 is attached along the side plate 9a from which the heat sink 10 of the electrical component box 9 projects. The cooling duct 12 is formed in a U-shaped cross section in a plan view, the open side portion faces the electrical component box side plate 9a, and the flange portion provided along the edge is formed on the electrical component box side plate 9a. Installation fixed.

  The cooling duct 12 covers the heat sink 10 protruding from the electrical component box side plate 9a, and the upper and lower ends thereof are fitted into openings 12a and 12b provided in the horizontal division plate 2 and the housing bottom plate 1a, respectively. Therefore, the heat exchange chamber 3 communicates with the outside of the casing bottom plate 1a through the cooling duct 12.

  In the side plate 9 a of the electrical component box 9, a vent hole 13 is provided at a portion facing the upper portion of the cooling duct 12, and the interior of the electrical component box 9 and the interior of the cooling duct 12 are communicated with each other through the vent hole 13. A mouth body 14 that protrudes toward the cooling duct 12 is provided along the peripheral end portion of the vent hole 13, and the front end of the mouth body 14 is covered with a hood member 15 with a predetermined interval.

  Therefore, the air guided from the inside of the electrical component box 9 to the vent hole 13 is guided to the mouth body 14 provided along the peripheral end portion of the vent hole 13 and led out from the electrical component box 9. And it distribute | circulates through the clearance gap between the front-end | tip of the opening | mouth body 14, and the hood member 15, flows along the clearance gap between the hood member 15 and the electrical component box side plate 9a, and is finally guide | introduced in the cooling duct 12. FIG.

  This is an outdoor unit of an air conditioner configured as described above. When an operation command signal is input, the compressor 8 is driven and the indoor heat in the outdoor heat exchanger 5, valves, gas-liquid separator 7 and indoor unit is driven. The refrigerant is guided to the exchanger, and the refrigeration cycle operation 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 through the outdoor fan 6.

  The heat exchange chamber 3 becomes negative pressure due to the air blowing action of the outdoor blower 6, the influence reaches the cooling duct 12 communicating with the heat exchange chamber 3, and the inside of the cooling duct 12 also becomes negative pressure. Outside air outside the casing bottom plate 1 a is sucked from the casing bottom plate opening 12 b of the cooling duct 12, and is led to the heat exchange chamber 3 from the opening 12 a provided in the horizontal partition plate 2 through the cooling duct 12.

  While the outside air flows through the cooling duct 12, it contacts the heat sink 10 and exchanges heat with each other. The heat transmitted to the heat sink 10 from the electric component C2 having a large heat generation amount such as an inverter circuit is radiated to the outside air flowing through the cooling duct 12, and the electric component C2 is cooled together with the heat sink 10. The heat of the electrical component C2 is hardly released to the interior of the electrical component box 9 and the inside of the machine room 4, and the temperature rise is suppressed.

  Since the cooling duct 12 is attached along the side plate 9a of the electrical component box 9, the 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 (side plate 9a) facing the cooling duct 12 is cooled by the outside air.

  Further, when the outdoor blower 6 is driven and the inside of the cooling duct 12 becomes negative pressure, the inside of the electrical component box 9 communicating with the cooling duct 12 via the vent hole 13 also becomes negative pressure. As a result, the 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 9 b of the electrical component box 9. The air in the machine room 4 is outside air introduced through an outside air intake hole (not shown) provided in the housing bottom plate 1a. In fact, fresh and low temperature outside air is introduced into the electrical component box 9. Become.

  The outside air introduced into the electrical component box 9 from the air introduction hole 11 of the electrical component box bottom plate 9b comes into direct contact with the electrical components C2 and C1 accommodated in the electrical component box 9 and cools them. The outside air whose temperature has been increased by cooling is led out from a vent hole 13 provided in the upper part of the electrical component box 9, guided to 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 circulates in the cooling duct 12, and the air guided through the vent hole 13 merges. These combined air is guided to the heat exchange chamber 3 and further exhausted to the outside by the action of the outdoor blower 6.

  In this way, the heat sink 10 attached to the electrical component C2 having a large calorific value such as an inverter circuit protrudes into the cooling duct 12 and is cooled by the outside air flowing therethrough. The electrical component box side plate 9 a facing the cooling duct 12 is cooled by outside air flowing through the cooling duct 12. The electrical components C2 and C1 in the electrical component box 9 are directly cooled by cooling air introduced into the box 9 from the air introduction hole 11 of the electrical component box bottom plate 9b.

  The outside air after cooling the heat sink 10, the electrical component box side plate 9a, and the electrical components C2, C1 is exhausted to the outside through the heat exchange chamber 4, and the heat sink 10, the electrical component box side plate 9a, the electrical component C2, and the like. C1 always leads to fresh and low temperature outside air. Therefore, an increase in the internal temperature of the electrical component box 9 is reliably suppressed, effective cooling of the electrical components C2 and C1 is performed, and a significant improvement in cooling efficiency is obtained.

  Since the outside air outside the casing bottom plate 1a is introduced into the cooling duct 12, the cooling duct 12 has a gap between the casing bottom plate 1a and the casing installation surface G regardless of what heavy rain falls. There are few water droplets reaching the housing bottom plate opening 12b, and it is unlikely that there will be water droplets that enter the cooling duct 12 from here.

  Let us assume a case where water droplets such as rainwater are mixed into the outside air and enter the cooling duct 12. Most water droplets impinge on the heat sink 10 immediately after entering the cooling duct 12 and cannot enter the interior any more. Even if it passes through the heat sink 10, the water droplets are led out as they are from the cooling duct upper end opening 12 a provided in the horizontal partition plate 2 to the heat exchange chamber 3. The outdoor heat exchanger 5 disposed in the heat exchange chamber 3 has a configuration that does not interfere with rainwater itself, so that even if there are water droplets entering the heat exchange chamber 3 from the cooling duct 12, no matter what. There is no hindrance.

  Depending on the situation, a part of the water droplets that have passed through the heat sink 10 may enter the gap between the hood member 15 and the electrical component box side plate 9a in the upper part of the cooling duct 12. However, the water droplets that have entered the gap with the hood member 15 immediately collide with the mouth body 14 projecting along the peripheral end portion of the vent hole 13 to prevent further intrusion. The mouth body 14 has a function of a so-called baffle plate, and no water droplets reach the vent hole 13. Naturally, there are no water droplets entering the electrical component box 9 from the vent hole 13 under the negative pressure condition.

  Outside air is also guided from the air introduction hole 11 of the electrical component box bottom plate 9b. As described above, the air introduction hole 11 is provided at a distance from the outside air intake hole provided in the housing bottom plate 1a. It has been. In the unlikely event that a water droplet enters the inside of the housing from the outside air intake hole, there is no water droplet reaching the air introduction hole 11 from the outside air intake hole, and the electrical component box 9 from the air introduction hole 11. Since it does not enter, the short circuit accident of the electrical components C1 and C2 can be reliably prevented.

(Example 2)
Next, Example 2 will be described with reference to FIG. Since the overall configuration of the outdoor unit is basically the same as that described above with reference to FIG. 1, the same description is applied and a new description is omitted. FIG. 2 is an enlarged schematic cross-sectional view of the electrical component box 9 and its periphery.

  An electrical component box 9 that houses electrical components C1, C2 and the like is disposed in the machine room 4. The heat sink 10 protrudes integrally from the electrical component C2 that 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 electrical component box bottom plate 9b, and the cooling duct 12 is attached along the side plate 9a from which the heat sink 10 protrudes.

  The cooling duct 12 covers the heat sink 10, and the upper and lower end portions are fitted into the horizontal division plate 2 and the openings 12a and 12b of the housing bottom plate 1a. A vent hole 13 is provided in the upper part of the electrical component box side plate 9a, and a mouth body 14 is provided along the peripheral end of the vent hole 13. The front end of the mouth body 14 is covered with a hood member 15 with a gap. It has been broken. The above is exactly the same as the configuration described above with reference to FIG.

  Here, a partition plate 20 is provided for partitioning the side plate 9a of the electrical component box 9 in which the vent hole 13 is provided and the interior of the electrical component box 9, and the partition plate 20 includes the interior of the electrical component box 9, the vent hole 13, and the like. A plurality of guide holes 21 communicating with each other is 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 9 a with a narrow predetermined distance from the side plate 9 a in the electrical component box 9. The upper end portion 20a of the partition plate 20 is bent at an upper portion of the vent hole 13, and the bent end edge is fixed to the side plate 9a. The lower end portion 20b of the partition plate 20 is bent at the vicinity of the electrical component box bottom plate 9b, and the bent edge is fixed to the side plate 9a. Furthermore, the left and right side portions of the partition plate 20 are bent, and the bent end edges are fixed to the side plate 9a.

  Depending on the electrical components C1 and C2, it is directly attached to the partition plate 20 or attached through the partition plate 20. Therefore, the partition plate 20 forms a substantially sealed space D with respect to the side plate 9a.

  Through these guide holes 21, the interior of the electrical component box 9 and the substantially sealed space D formed between the partition plate 20 and the side plate 9 a are communicated. Further, since the substantially sealed space D and the inside of the cooling duct 12 are communicated with each other through the vent hole 13, the interior of the electrical component box 9 is communicated with the inside of the cooling duct 12 via the substantially sealed space D.

  In such a configuration, a substantially sealed space D formed by the partition plate 20 and the side plate 9 a is interposed as an air layer between the interior of the electrical component box 9 and the cooling duct 12, and the cooling duct is formed from the interior of the electrical component box 9. 12 is obtained.

  In the partition plate 20, since many guide holes 21 are provided 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 sealed space D and the vent hole 13, and the temperature rise inside the electrical component box 9 is reliably suppressed. .

(Example 3)
Next, Example 3 will be described with reference to FIGS. Since the overall configuration of the outdoor unit is basically the same as that described above with reference to FIG. 1, the same description is applied here and a new description is omitted. 3 is an exploded perspective view of the electrical component box 9, FIG. 4 is a schematic cross-sectional view of the double structure member 30 constituting a part thereof, and FIG. 5 is a perspective view of the double structure member 30.

  In FIG. 3, the electrical component box 9 is viewed from the front side, and the air holes 13 provided in the side plate 9a of the electrical component box 9 are illustrated, but the cooling duct 12 attached to the back side is omitted. . The configuration of the cooling duct 12 itself is the same as that described above with reference to FIG. 1, and the description thereof is omitted.

  The electrical component box 9 is composed of a main electrical component box 9M that accommodates an electrical component C1 that generates a small amount of heat and an electrical component C2 that generates a large amount of heat, and an auxiliary electrical component that accommodates only an electrical component C3 that generates a large amount of heat, such as a reactor. It is comprised from the box 9N.

  An opening 25, which will be described later, is provided on one side of the main electrical component box 9M, the electrical components C1 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 attached through 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 an upper surface plate 9e that is bent at the upper end of the main electrical component box 9M. A bottom plate 9 f is provided at the lower end, and a flange portion 9 h provided along the left and right side edges is attached to the double structural member 30.

  As described above, the auxiliary electrical component box 9N is a box that is mounted separately from the main electrical component box 9M, and has a substantially hermetically sealed structure. Therefore, heat radiation from the electrical component C3 housed inside is the main electrical component. The inside of the box 9M is not affected.

  The left and right side portions of the auxiliary electrical component box 9N have a so-called armor door structure, and ventilation to the inside is ensured. The heat released from the electrical component C3 accommodated in the interior does not flow into the auxiliary electrical component box 9N, and there is no possibility that the electrical component C3 itself has a thermal influence. Although it is unlikely that water droplets such as rainwater will be applied to the auxiliary electrical component box 9N, even if it gets wet, there is no possibility of entering the inside through the gap of the armor door.

  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 9 a and a predetermined gap in the first plate 31. And a second plate 32 that is overlapped. The first plate 31 closes the opening 25 provided in the main electrical component box 9M, and the second plate 32 is in a position protruding into the main electrical component box 9M. And the electrical component C1 similar to the electrical component C1 accommodated in the main electrical component box 9M is attached to the inner surface of the main electrical component box 9M of the second plate 32.

  An air layer is formed between the first plate body 31 and the second plate body 32, and there is a heat insulating effect. Therefore, even if the double structural member 30 receives heat radiated from the electrical component C3 that generates a great amount of heat, such as a reactor in the auxiliary electrical component box 9N, the air layer exhibits a heat insulation effect and enters the main electrical component box 9M. Heat transfer can be minimized, and there is almost no thermal influence on the electrical component C3 in the main electrical component box 9M.

  Furthermore, by disposing a relatively difficult component such as a reactor in the auxiliary electrical component box 9N, in addition to the problem of heat treatment, space saving of the main electrical component box 9M and the degree of freedom of component layout are improved.

Example 4
Next, a fourth 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 the configuration in which the partition plate 20 is provided with a predetermined distance from the electrical component box side plate 9a is the same as that shown in FIG. It is the same as that described in Example 2), and 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 is shown in FIGS. This is the same as that described in the third embodiment. Here, the respective drawings are applied and a new description is omitted.

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

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

  Therefore, a gap D formed between the first plate 31 and the second plate 32 is communicated with a gap (substantially sealed space) D between the side plate 9a and the partition plate 20. As described above, since the gap (substantially sealed space) D between the side plate 9a and the partition plate 20 communicates with the vent hole 13, the first plate 31 and the second plate constituting the double structural member 30 are used. The gap D between the bodies 32 communicates with the vent hole 13.

  With such a configuration, the double structural member 30 receives heat radiated from the electrical component C3 that generates a great amount of heat, such as a reactor in the auxiliary electrical component box 9N, and is blocked by the air layer formed in the gap D. Heat is generated and the air in the air layer rises in temperature. The air whose temperature has risen is led to the gap D between the side plate 9a and the partition plate 20, and further led to the cooling duct 12 through the vent hole 13 and exhausted to the outside.

  The air layer of the double structural member 30 is supplemented with a part of the outside air introduced into the main electrical component box 9M, and the temperature rise is suppressed extremely efficiently. The influence of heat radiation from the electrical component C3 where the amount of heat generated in the auxiliary electrical component box 9N is extremely large does not affect the main electrical component box 9M, and heat transfer is suppressed to a minimum.

(Modification)
Next, a modification is demonstrated based on FIGS.

  Basically, the overall configuration of the outdoor unit is the same as that described above with reference to FIG. 1, but in this modification, two inverter-driven compressors 8a and 8b that are individually controlled in the machine room 4 are provided. It is different in point to be arranged.

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

  Here, the respective drawings are applied and new description is omitted, and only the differences will be described.

  Two compressors 8a and 8b are disposed in the machine room, and these are driven by inverters C2a and C2b disposed at the position C2 of the main electrical component box 9, respectively. The inverters C2a and C2b are arranged side by side in a horizontal direction in a positional relationship corresponding to the compressors 8a and 8b that are driven by the inverters C2a and C2b, respectively, and the heat sinks 10 are integrally projected from the inverters C2a and C2b.

  Because of such a configuration, for example, the inverter C2a is disposed below and the inverter C2b is provided so as to protrude from the lower inverter C2a as compared with the case where the inverter C2b is disposed vertically. The heat generated from the heat sink 10 does not interfere with the heat sink 10 of the upper inverter 2 </ b> Cb, and both the heat sinks 10 are efficiently cooled by the duct 12. Further, since the inverters C2a and C2b are made to correspond to the positional relationship of the compressors 8a and 8b that drive the inverters C2a and C2b, respectively, excellent maintainability at the time of failure or the like is obtained.

  It should be noted that the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention.

  According to the present invention, the cooling efficiency for the electrical components in the electrical component box arranged in the machine room is ensured, the penetration of water droplets into the electrical component box is surely prevented, and there is no occurrence of a short circuit accident or the like. In addition, there is an effect that a safe cooling structure is obtained.

Claims (5)

The inside of the housing is divided into upper and lower parts via a horizontal division plate, the upper part is a heat exchange chamber in which a heat exchanger and a blower are arranged, and the lower part is a machine room in which a compressor and the like are arranged. In an outdoor unit of an air conditioner equipped with an electrical component box that accommodates
From the side plate constituting the electrical component box, a heat sink for cooling the electrical component having a large calorific value is projected,
Along with the side plate of the electrical component box on which the heat sink is projected, the heat sink is covered and an opening is provided in the horizontal partition plate and the case bottom plate. Is installed, and after having heat exchanged with the heat sink, a cooling duct that is led out from the opening of the horizontal section plate is provided,
An outdoor unit of an air conditioner, wherein a vent hole is provided in a side plate of the electrical component box to conduct air inside the electrical component box and guide the exhaust into the cooling duct. The inside of the housing is divided into upper and lower parts via a horizontal division plate, the upper part is a heat exchange chamber in which a heat exchanger and a blower are arranged, and the lower part is a machine room in which a compressor and the like are arranged. In an outdoor unit of an air conditioner equipped with an electrical component box that accommodates
From the side plate constituting the electrical component box, a heat sink for cooling the electrical component having a large calorific value is projected,
Along with the side plate of the electrical component box on which the heat sink is projected, the heat sink is covered and an opening is provided in the horizontal partition plate and the case bottom plate. A cooling duct for guiding the heat exchange chamber from the opening of the horizontal partition plate after conducting heat exchange with the outside air and the heat sink,
A vent hole is provided in the side plate of the electrical component box to conduct air in the electrical component box and guide the exhaust into the cooling duct.
Provided with a partition plate that partitions the side plate of the electrical component box provided with the vent and the interior of the electrical component box,
An outdoor unit of an air conditioner, characterized in that a guide hole that communicates the interior of the electrical component box and the vent hole is provided in the partition plate. The electrical component box is composed of a main electrical component box that houses the inverter circuit and other electrical components, and an auxiliary electrical component box that is attached to the main electrical component box and only accommodates electrical components that generate extremely large amounts of heat, such as reactors. And
2. The outdoor unit of an air conditioner according to claim 1, further comprising a double structure member having an air layer interposed at a main electrical component box mounting portion of the auxiliary electrical component box.   The outdoor unit of an air conditioner according to claim 3, wherein the air layer of the double structure member communicates with a vent hole provided in a side plate of the electrical component box. The inside of the housing is divided into upper and lower parts via a horizontal division plate, the upper part is a heat exchange chamber in which a heat exchanger and a blower are arranged, and the lower part is a machine room in which a compressor and the like are arranged. In an outdoor unit of an air conditioner equipped with an electrical component box that accommodates
A heat sink for cooling the electrical component having a large heat generation 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 is projected. An opening is provided in the horizontal partition plate and the housing bottom plate, and a cooling duct is introduced from the opening of the horizontal partition plate after introducing external air from the housing bottom plate opening in accordance with the operation of the blower and exchanging heat with the heat sink. Provided,
Two compressors are arranged in the machine room, and the electrical component having a large calorific value is two inverter devices that individually drive the two compressors, and these are arranged in parallel in the horizontal direction. An outdoor unit of an air conditioner characterized by that.

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