WO2003016788A1 - Outdoor unit of air conditioner - Google Patents

Abstract

An outdoor unit of an air conditioner, comprising a heat sink cover (11) covering the upper surface of a heat sink tank (10) so that cooling air flows from the upper side to the lower side of the heat sink (10) having heat emitting electrical parts (9a) installed thereon so that heat is conducted therethrough, disposed apart from the upper end (10t) of the heat sink so that an opening part (12) allowing cooling air to flow therein can be formed, and having a ventilating swelled part (13) provided on the opposite side of the opening part (12) and changing the direction of air flow formed thereon, and an waterproofing plate (15) disposed so that a ventilating path (16a) can be formed between the heat sink cover (11) and the upper end (10t) of the heat sink, installed apart from the upper end (10t) of the heat sink so that a ventilating clearance (16b) can be formed opposedly to the ventilating swelled part, and preventing the entry of rain water into the heat sink (10).

Description

 Outdoor unit of air conditioner

Technical field

 The present invention relates to an outdoor unit for an air conditioner, and particularly to improving the cooling air flow to a heat sink by devising a structure of a heat sink cover and a waterproof plate.

The present invention relates to an outdoor unit of an air conditioner in which the cooling effect of electric components is improved. Background art

 Conventionally, the structure of an outdoor unit of an air conditioner generally has a structure as shown in FIGS. 15 and 16 and accommodates a heat exchanger 32 and a blower 33 of an outdoor unit 31. A partition plate 36 separates the blower room 3 4 from the machine room 35, and an electrical component box 37 is installed at the upper part of the machine room 35. A heat sink 39 for cooling the electric component 38 is installed in the blower room 34 with the fin 39 a in the vertical direction with the partition plate 36 interposed therebetween. The heat sink 39 has a heat sink cover 40, which is a cooling duct, and takes in air from the machine room 35 from above the heat sink 39, and supplies air to the heat sink 39 from above to below. Has a flowing structure. In addition, a waterproof plate 42 is attached to the upper surface of the heat sink 39 so as to prevent rainwater or the like from entering from below the heat sink 39 and from above the housing 41 due to backflow of air without any gap.

However, in the conventional outdoor unit 31 of the air conditioner, the cooling air taken in from the upper part of the heat sink 39 is bent by 180 ° and is sucked by the differential pressure of the blower 33, so that the heat sink 39 Cooling air was difficult to reach the base side (electric parts side) of 9. In particular, since the waterproof plate 42 is provided without a gap between the upper surface of the heat sink 39 and the gap g0 near the upper side of the heat sink 39, there is a drawback that cooling air is difficult to enter and heat is easily released. Electrical components attached to heat sink 3 9 3 8 Since the temperature of the heat sink reaches 90 to 100 ° C., heat is absorbed by the air vortex generated above the heat sink 39, and the upper part of the fin 39a is not effectively used.

 The present invention has been made to solve the above problems.

 Therefore, according to the present invention, the cooling air flow to the heat sink is optimized, the cooling efficiency of the heat sink is improved, the size of the heat sink can be reduced, and the cooling effect of the electrical components on the electrical component substrate can be improved. It aims to provide an outdoor unit of an air conditioner that can be used. Disclosure of the invention

 In order to achieve the above object, according to one aspect of the present invention, an outdoor heat exchanger, a unit main body in which an outdoor blower and the like are stored, and a unit formed by partitioning the unit main body, the outdoor heat exchanger A blower room accommodating an outdoor blower, a mechanical room accommodating an electric component board on which electric components are mounted, and a relatively large heat generation accommodated in the blower room and electrically connected to the electric components. A heat sink in which electrical components with heat sinks are attached in a heat conductive manner, and a plurality of heat radiation fins formed in the vertical direction are provided, and cooling air flows from above to below the heat sink. The heat sink is provided so as to be spaced apart from the upper end of the heat sink so as to form an opening that covers the upper surface of the heat sink and into which the cooling air flows. Change A heatsink cover having a bulging portion formed therein, a ventilation passage formed between the heatsink force par and the upper end of the heatsink, and a ventilation gap formed opposite the ventilation bulging portion. An air conditioner outdoor unit is provided, which is provided with a waterproof plate provided at a distance from the upper end of the heat sink to prevent infiltration of rainwater or the like into the machine room. As a result, the cooling air flow to the heat sink is optimized, the cooling efficiency of the heat sink is improved, the size of the heat sink can be reduced, and the cooling effect of the electrical components on the electrical component substrate can be improved.

 In a preferred example, the lower end of the heat sink cover reaches the lower end of the heat sink. As a result, the cooling air flow can be reliably guided to the lower end of the heat sink, and the cooling efficiency of the heat sink can be increased.

In a preferred example, the heat sink cover has a lower surface portion of the ventilation bulging portion, At right angles or acute angles to the vertical. As a result, the cooling air flow can be directed toward the upper end of the heat sink, and the air flow can reach the gap formed between the waterproof plate and the upper end of the heat sink and the corner on the plane side of the heat sink. This improves the cooling efficiency of electrical components that generate heat.

 Further, in another preferred example, the heat sink cover has a lower surface portion of the ventilation bulging portion extending to a central position of an upper end of the heat sink, and a waterproof plate extending to a central position of an upper end of the heat sink, and And a vent formed between the waterproof plate and the waterproof plate. As a result, the airflow from the vent can be supplied to the base of the heat sink while maintaining the function of preventing rainwater or the like from entering the machine room where the electrical components are located due to headwinds, etc. The cooling efficiency of the accompanying electric parts is improved.

 In a preferred example, the waterproof plate is provided with a first flat plate provided to be spaced apart from the upper end of the heat sink and extending to a center position of the upper end of the heat sink, and a first flat plate which covers the entire heat sink and has a ventilation opening. It has two flat plates. This allows the airflow from the vent to be supplied to the base of the heat sink while maintaining the function of preventing water from entering the machine room where the electrical components are located due to headwinds, etc. The cooling effect of electrical components can be improved.

 Further, in a preferred example, the electric component board and the electric component that generates heat are arranged so as to be located substantially at the center with respect to the width direction of the heat sink, and are provided above the electric component board. An opening partition plate for partitioning the opening into right and left portions is provided. This effectively cools the electric components that generate heat, and adjusts the partitioning position of the opening partition plate back and forth to allow the airflow flowing on the surface of the electrical component board and the airflow flowing on the back surface Distribution can be adjusted, the required cooling air volume of the electrical component board can be adjusted, and the electrical components can be cooled under optimal conditions.

In a preferred example, the electrical component board is housed in the vicinity of a partition wall of a machine room, and is arranged in a substantially L-shape with a heat sink, and is substantially parallel to the first electrical component board. And a second electrical component board extending and arranged to a position facing the opening. This makes it possible to cool the electrical components mounted on both electrical component boards, and furthermore, it is possible to adjust the flow rate of the cooling air flowing on both electrical component boards by adjusting the distance between the two electrical component boards. Therefore, adjust the position of the second electrical component board. Only with the above, it is possible to optimally distribute the required cooling air based on the calorific value of the electric components.

 Further, in a preferred example, the lower end of the heat sink of the heat sink is notched, and the lower end of the heat sink cover facing the lower end of the heat sink is notched. As a result, the heat sink can be lowered without contacting the bell mouth in the blower room or the outdoor blower, and the area of the opening or ventilation gap provided in the upper part of the heat sink can be increased, and cooling can be achieved. Performance can be improved. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a plan view showing an outdoor unit of an air conditioner according to the present invention with a casing top plate removed.

 FIG. 2 is a front view of the outdoor unit of the air conditioner according to the present invention, in which a part of a front casing plate is removed.

 FIG. 3 is a side sectional view showing the vicinity of a heat sink of the outdoor unit of the air conditioner according to the present invention.

 FIG. 4 is a perspective view showing the vicinity of a heat sink of the outdoor unit of the air conditioner according to the present invention.

 FIG. 5 is a side sectional view of a first modification of the heat sink provided on the outdoor unit of the air conditioner according to the present invention.

 FIG. 6 is a side sectional view of a second modified example of the heat sink force par provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 7 is a side sectional view of a third modification of the heat sink force bar provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 8 is a side sectional view of a modified example of the waterproof plate provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 9 is a perspective view of a first modification of the electrical component substrate provided in the outdoor unit of the air conditioner according to the present invention.

FIG. 10 is a side sectional view of a first modification of the electrical component substrate provided in the outdoor unit of the air conditioner according to the present invention. FIG. 11 is a perspective view of a second modification of the electrical component substrate provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 12 is a sectional side view of a second modification of the electrical component substrate provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 13 is a plan view of a second modification of the electrical component substrate provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 14 is a sectional side view of a modified example of the heat sink and the heat sink cover provided in the outdoor unit of the air conditioner according to the present invention.

 FIG. 15 is a cross-sectional view near the heat sink of the outdoor unit of the conventional air conditioner. FIG. 16 is a perspective view near the heat sink of the outdoor unit of the conventional air conditioner. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, an embodiment of an outdoor unit of an air conditioner according to the present invention will be described with reference to the accompanying drawings.

 FIG. 1 is a plan view showing the outdoor unit of the air conditioner according to the present invention with the casing top removed, and FIG. 2 is a front view of the outdoor unit of the air conditioner according to the present invention before casing. It is a front view which removes and shows a part of board.

 As shown in FIGS. 1 and 2, the outdoor unit 1 of the air conditioner according to the present invention has a unit body 4 in which an outdoor heat exchanger 2, an outdoor blower 3 and the like are stored. . The unit body 4 has a blower room 5 in which the outdoor heat exchanger 2 and the outdoor blower 3 are stored, and a machine room defined on one side of the unit body 4 and in which the electrical component board 6 is stored. The blower room 5 and the machine room 7 are separated by a partition plate 8. Further, the machine room 7 accommodates electrical components 9 used for inverter control. The electrical components 9 are used as inverter control elements and generate relatively large heat. For example, a GTR (Giant Transistor) 9a and various operation control elements 9b electrically connected to the GTR 9a, such as capacitors.

The above-mentioned GTR9a generates relatively large heat during use, so it is preferable to dissipate heat. The heat can be dissipated.

 The heat sink 10 is made of a material having a high thermal conductivity, such as an aluminum material, and has a rectangular shape. On one surface side, a plurality of heat sinks extending from the heat sink upper end 10 t to the heat sink lower end 10 d are provided. The fin 10a of the strip is erected, and the other side forms a plane 10b. Further, the heat sink 10 is mounted on the partition plate 8, and the fin 10 a is located on the side of the blower room 5, whereas the flat surface 10 b is mounted on the mounting plate formed in the partition plate 8. The GTR 9a located in the machine room 7 is attached to the plane 10b exposed from the portion 8a to the machine room 7 side and exposed to the machine room 7 side as described above.

 As shown in FIGS. 3 and 4, a heat sink force bar 11 is provided above the heat sink 10. The cross section of the heat sink cover 11 is substantially reversed so that an opening 12 and a ventilation bulging portion 13 that changes the direction of the air flow are formed on the opposite side of the opening 12. The heat sink (fin) is disposed apart from the upper end 10 t of the heat sink (fin) so as to form the opening 12 so as to cover the upper surface of the heat sink 10. The lower surface 13a of the ventilation bulging portion 13 forms an obtuse angle with the vertical line, and the lower end 11a of the cover reaches the vicinity of the lower end 10d of the heat sink (fin). The opening 12 opens toward the ventilation path 14 formed above the machine room 7 so that cooling air flows from the machine room 7.

 Further, a waterproof plate 15 inserted into the opening 12 at a distance from the fin upper end 10 t is provided above the heat sink 10, and a small slope of the waterproof plate 15 is provided. The tip 15a which is inclined downwards is located in the downstream direction of the airflow from the position of the upper end corner 10a1 of the fin 10a, and the waterproof plate 15 A ventilation path 16a is formed between the heat sink cover 11 and the heat sink cover 11, and a ventilation gap 16b is formed between the waterproof plate 15 and the upper end 10t of the fin. The air flows through the air passage 16a, the air bulging portion 13 and the air gap 16b, and flows along the fins 10a from above the heat sink 10 to below.

In addition, when the waterproof plate 15 receives rainwater or the like through the heat sink cover 11 at the time of water injection or reverse wind, electric water such as the GTR 9a and various operation control elements 9b enters the machine room 7. To prevent wetting. The heat sink cover 11 has an opening 1 based on the positional relationship with the outdoor blower 3 and the bell mouth 17 provided on the outdoor blower 3. 2 and the distance between the heat sink 10 and the waterproof plate 15 can be freely determined. Further, since it is preferable that the various operation control elements 9b suppress the temperature rise, they are housed close to the partition wall of the machine room 7, for example, the rear wall 4a of the unit body, and are almost L-shaped with the heat sink 10. It is attached to the electrical component substrate 6 arranged in a shape, and is arranged in the airflow.

 Reference numeral 18 denotes an air inlet, 19 denotes an air outlet, 20 denotes a machine room air inlet, and the machine room air inlet 20 is provided on a side surface of the unit body 4 in the present embodiment. However, the present invention is not limited to this, and may be provided on the front surface or the rear surface of the unit body 4. Next, cooling and condensation of the refrigerant using the outdoor unit of the air conditioner as a condenser will be described.

The high-temperature refrigerant compressed by the compressor 22 housed in the machine room 7 flows into the outdoor heat exchanger 2 as shown in FIG. 1, and the air intake 18 is rotated by the rotation of the outdoor blower 3. And is cooled and condensed by the air blown out from the air outlet 18. Also, when the outdoor blower 3 rotates, the inverter control circuit operates, so that the electric component 9 generates heat. In particular, since the GTR 9a generates a large amount of heat, heat is required. On the other hand, when the outdoor blower 3 rotates, since the inside of the blower room 5 becomes a negative pressure as shown in FIG. 1, air is taken in from the machine room air inlet 20. Furthermore, as shown in FIG. 3, the air taken into the machine room 7 flows through the machine room 7 as a cooling air flow, and is stored in the machine room 7 and various operation control mounted on the electrical component substrate 6. Cool element 9b and cool GTR 9a. Furthermore, the airflow that has cooled the electric components 9 reaches the openings 12 through the ventilation passages 14 formed above the machine room 7. The airflow that has reached the opening 1 2 passes through the air passage 16 a formed between the waterproof plate 15 and the heat sink cover 11, reaches the air swelling portion 13, and passes through the air swelling portion 13. The direction is changed to reach the ventilation gap 16 b, and flows along the fins 10 a from above the heat sink 10 to below. In the course of the flow of the air flow, the air flow changed in direction at the ventilation bulging portion 13 is acted on by the waterproof plate 15, as shown in FIGS. The air flow reaches the air gap 16 b formed between 0 t and the corner g on the flat side of the air gap, and the fin 10 a can exert its full effect, improving the cooling efficiency of the GTR 9 a. Up. In addition, ventilation efficiency is improved by the tip 15 a having a slope below the waterproof plate 15. In addition, since the tip 15a is located in the downstream direction of the air flow from the position of the fin upper end corner 10a1 of the fin 10a, it is ensured that rainwater and the like enter the machine room 7. Can be prevented.

 In the process in which the cooling air flow flows from above to below the heat sink 10 along the fins 10a, the cooling air flow passes through the heat sink 10 having the fins 10a, and At 0b. The thermally conductive GTR 9a is effectively cooled.

 Therefore, even if the GTR 9a generates heat, it is sufficiently dissipated and cooled, so that performance degradation or trouble does not occur. In addition, since heat radiation in the vertical direction of the heat sink 10 can be made uniform, the heat sink 10 can be downsized.

 Next, a first modification of the heat sink cover provided in the outdoor unit of the air conditioner according to the first embodiment of the present invention will be described.

 In the first modification, the lower end of the force bar of the heat sink cover used in the above-described embodiment is located near the lower end of the heat sink, while the lower end of the power bar is extended to the lower end of the heat sink. is there.

 For example, as shown in FIG. 5, the heat sink cover 11A of the first modified example has a lower end 11Aa of the cover extending to a position of a lower end (fin lower end) 10d of the heat sink 1OA. It is provided. The other configuration is the same as the outdoor unit of the air conditioner shown in FIG. 3, and thus the same reference numerals are given and the description is omitted.

 Therefore, the cooling air flow can be reliably guided to the lower end 10Ad of the heat sink 1OA, and the cooling efficiency of the heat sink 1OA can be increased.

 Further, a second modification of the heat sink cover will be described.

 In the second modified example, the lower surface of the ventilation swelling portion of the heat sink force bar used in the above-described first embodiment forms an obtuse angle with respect to the vertical line, but forms a right angle or an acute angle. It is.

For example, as shown in FIG. 6, in the heat sink cover 11B of the second modification, the lower surface 13Ba of the ventilation bulging portion 13B forms a right angle or an acute angle with respect to a vertical line. I have. Therefore, the cooling air flow can be directed in the direction of the upper heat sink 10 Bt, and the ventilation gap 16 formed between the waterproof plate 15 and the upper heat sink (fin upper end) 10 Bt. The air flow can reach b and the plane side (fin base side) corner g, and the effect of the fin 10a can be fully exerted, thereby improving the cooling efficiency of the GTR 9a. Further, a third modification of the heat sink cover will be described.

 In the third modification, the lower surface of the ventilation swelling portion of the heat sink cover used in the above-described first embodiment forms an obtuse angle with respect to a vertical line, but is bent at a right angle. It extends at the center of the upper end of the fin.

 For example, as shown in FIG. 7, in the heat sink cover 11 C of the third modification, the lower surface 13 C a of the ventilation bulging portion 13 C forms a right angle with respect to the vertical line, and the fin ( (Heat sink) Extends to the center of the top 1 OCt. The waterproof plate 15 C is also provided to extend to the center position of the fin upper end 10 Ct. Near the center position of the fin upper end 10 Ct, the lower surface 13 C a and the waterproof plate 15 C are provided. The air vent 16 C is formed by the Further, a part 13 Cb of a fin force bar extending along the fin 10 Ca from the ventilation bulging part 13 C is provided.

 Therefore, while maintaining the function of preventing rainwater or the like from entering the machine room 7 in which the electrical components 9 are located due to a headwind or the like, the airflow from the ventilation port 16 C is supplied to the base side of the heat sink 10 C. Therefore, the cooling effect of the GTR 9a can be improved. Further, a modified example of the waterproof plate provided in the outdoor unit of the air conditioner according to the first embodiment of the present invention will be described.

 In a modified example of the present waterproof plate, the waterproof plate used in the above-described embodiment is formed of a single flat plate, and its tip portion reaches the upper end corner of the fin, but extends to the center position of the upper end of the fin. It has a first flat plate and a second flat plate which covers the entire fin and has a ventilation opening.

 For example, as shown in FIG. 8, the waterproof plate 15 D of the present modification is provided with a first flat plate 1 provided at a distance from the fin upper end l OD t and extended to the center position of the fin upper end 10 D t. 5D1 and a second flat plate 10D2 that covers the entire fin upper end 10Dt and is provided with a ventilation opening 16D.

Therefore, it is possible to prevent rainwater or the like from entering the machine room via the heat sink cover 11D during a headwind or the like. Furthermore, the airflow supplied from the opening 12D above the heatsink is separated from the airflow flowing along the ventilation bulge 13 of the heatsink cover 11D. The air flow passing through the ventilation opening 16D of the second flat plate 15D2 is divided into the airflow passing through the airflow opening 16D, and this split airflow is supplied from the upstream side of the heat sink 10D to the root of the heat sink 10D, thereby cooling efficiency. Can be increased.

 Further, a first modification of the electrical component substrate used in the embodiment according to the present invention will be described.

 In the first modified example of the electric component board, the electric component board used in the above-described embodiment is arranged substantially in an L-shape with the heat sink, whereas the electric component board used in the above-described embodiment is arranged in a substantially C-shape with respect to the heat sink. Things.

 For example, as shown in FIGS. 9 and 10, the electrical component substrate 6E of the first modification is disposed so as to be located at the center with respect to the width (lateral side) direction of the heat sink 10E. Further, the GTR 9a is similarly arranged so as to be located at the center of the heat sink 10E. In addition, an opening part 12E is partitioned at the upper part of the electrical component substrate 6E into left and right parts, and an opening parting plate 21 bent at the center part is provided.

 Therefore, since the GTRE 9a is located almost at the center of the heat sink 10E, the GTR 9a is effectively cooled, and by adjusting the partition position of the opening partition plate 21 back and forth, The distribution of the airflow flowing on the front side of the component board 6E and the airflow flowing on the backside can be adjusted, and the required cooling air flow of the electrical component board 6E can be adjusted. a and various operation control elements 9 b can be cooled.

 Further, a second modification of the electrical component substrate used in the embodiment according to the present invention will be described. -In the second modification of the electrical component board, the electrical component board used in the above-described embodiment is arranged substantially in an L-shape with the heat sink. It is arranged in parallel with the first electrical component substrate.

 For example, as shown in FIGS. 11 to 13, the electrical component substrate 6F of the second modified example is housed close to a unit body rear wall 4Fa as a partition wall of the machine room 7F. A first electrical component board 6F1 arranged in an approximately L-shape with the heat sink 10F, and extending to a position parallel to the first electrical component board 6F1 and facing the opening 12F. And the second electrical component board 6F2 provided and arranged.

Therefore, as shown in Fig. 11, it is taken from the machine room air intake of machine room 7F. The flowing air flows over the first electrical component substrate 6F1 and the second electrical component substrate 6F2. Thereby, the various operation control elements 9Fb mounted on the electrical component substrate 6F1 and the second electrical component substrate 6F2 can be cooled. Further, by adjusting the distance between the electrical component board 6F1 and the second electrical component board 6F2, the flow rate of cooling air flowing over the respective electrical component boards 6F1 and 6F2 can be adjusted. Only by adjusting the position of the second electrical component board 6F2, it is possible to optimally distribute necessary cooling air based on the amount of heat generated by the various operation control elements 9Fb.

 A description will be given of a modification in which the heat sink and the heat sink force bar used in the embodiment according to the present invention are simultaneously deformed.

 In a modification of the heat sink and the heat sink cover, the fin of the heat sink used in the above-described embodiment has a rectangular shape and the lower end of the heat sink cover extends to the lower end of the fin. Are notched.

 For example, as shown in FIG. 14, the heat sink 10 G of the present modification has a fin lower end 10 Gd that is notched, and furthermore, a heat sink cover that faces the fin lower end 10 G d. The end 11 Ga is also notched.

 Therefore, to increase the cooling air flow rate to the heat sink 10 G to improve the cooling performance, the opening 12 provided in the upper part of the heat sink 10 G or the ventilation gap 16 G b When it is necessary to increase the area, the heat sink 10G can be lowered without contacting the bell mouse and the outdoor blower in the blower room 5G. Industrial applicability

 According to the present invention, the cooling air flow to the heat sink is optimized, the cooling efficiency of the heat sink is improved, the size of the heat sink can be reduced, and the cooling effect of the electrical components on the electrical component substrate is also improved. An outdoor unit of an air conditioner that can be provided.

Claims

The scope of the claims 1. A unit body containing an outdoor heat exchanger, an outdoor blower, and the like, and a unit body formed by partitioning the unit body, and a blower room containing the outdoor heat exchanger, the outdoor blower, and electric components are attached. A machine room in which an electrical component substrate is housed, and an electric component which is housed in the blower room, and which is relatively connected to the electric component and generates relatively large heat, are heat conductively mounted, and A heat sink provided with a plurality of radiating fins formed in the direction, and an opening for covering the upper surface of the heat sink so that the cooling air flows downward from above the heat sink and into which the cooling air flows. A heat sink cover, which is disposed at a distance from the upper end of the heat sink and which is provided on the opposite side to the opening and has a ventilation bulging portion for changing the direction of air flow, An air passage is formed between the heat sink cover and the upper end of the heat sink, and is provided apart from the upper end of the heat sink so as to form a ventilation gap facing the air swelling portion. An outdoor unit for an air conditioner, characterized by having a waterproof plate for preventing water from entering the machine room. 2. The outdoor unit for an air conditioner according to claim 1, wherein a lower end of the heat sink cover reaches a lower end of the heat sink.  - 3. The outdoor unit of an air conditioner according to claim 1, wherein a part of the heat sink cover is bent at a right angle or an acute angle. 4. In the heat sink cover, the lower surface of the ventilation bulging portion extends to the center position of the upper end of the heat sink, and the waterproof plate extends to the center position of the upper end of the heat sink, and is provided between the lower surface portion and the waterproof plate. 2. The outdoor unit of the air conditioner according to claim 1, wherein a vent is formed. 5. The waterproof plate is provided separately from the upper end of the heat sink. 2. The outdoor unit of an air conditioner according to claim 1, comprising a first flat plate extending to a center position and a second flat plate covering the entire heat sink and having a ventilation opening formed therein. 6. The electrical component board and the heat-generating electrical component are arranged so as to be located substantially at the center with respect to the width direction of the heat sink, and the opening provided above the electrical component board is provided. 2. The outdoor unit of an air conditioner according to claim 1, wherein an opening partition plate is provided to partition right and left. 7. The electrical component board is a first electrical component board which is housed close to the partition wall of the machine room and is arranged substantially in an L-shape with the heat sink. The electrical component board is substantially parallel to the first electrical component board. 2. The outdoor unit of an air conditioner according to claim 1, further comprising: a second electrical component substrate extending to a position facing the opening. 8. The outdoor unit of an air conditioner according to claim 1, wherein the lower end of the heat sink is notched, and the lower end of the heat sink cover facing the lower end of the heat sink is notched.