KR101413931B1 - Outdoor unit of a airconditioning system, cooling method for the outdoor unit, and cooling apparatus for a box receiving elertric parts - Google Patents

Abstract

The inner space of the outdoor unit can be efficiently used, the power consumption is reduced, the manufacturing is facilitated, the price is lowered, the operation reliability is improved, the heat exchange efficiency is improved, and the cooling efficiency of the heat- An electric box connected to the door; A heat generating component placed on a substrate inside the electric field box; And an outdoor unit of an air conditioner using the heat dissipating unit and the heat dissipating unit of the electric component box, the heat dissipating unit being coupled to the case and including a heat sink exposed to the rear of the electric component box.

Inverter, cooling

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an outdoor unit of an air conditioner, a cooling method of the outdoor unit of an air conditioner, and a cooling apparatus of a cooling unit for a cooling system,

1 is a perspective view of an outdoor unit of an air conditioner according to the present embodiment.

2 is a rear perspective view of a front plate according to the present embodiment.

3 is a horizontal sectional view of the outdoor unit according to the embodiment.

4 is a vertical sectional view of the outdoor unit according to the embodiment.

5 is a block diagram illustrating a cooling method of an outdoor unit of an air conditioner according to the present embodiment.

The present invention relates to an air conditioner, and more particularly, to an outdoor unit of an air conditioner, a cooling method of an outdoor unit of an air conditioner, and a cooling device of an electric part box.

The air conditioner is a device that allows a user to enjoy a more comfortable life by allowing the air conditioning environment of the room to be forcibly controlled. The air conditioning apparatus is provided with an indoor unit that is placed in a room where an air conditioning environment is provided and an outdoor unit that is placed outdoors to perform an interaction with the indoor unit.

The outdoor unit includes a small outdoor unit used for cooling narrow rooms individually and a cooling tower type outdoor unit provided when a large building is to be air-conditioned. However, since the refrigerant in the outdoor unit of the cooling tower type is heat-exchanged by using water, there is a problem that the bacteria propagate in the cooling water, thereby deteriorating the health of the occupant. In view of such a problem, in recent years, an outdoor unit is provided in the form of a closed-type outdoor unit, in other words, a plurality of air-cooled large outdoor units that are not water-cooled.

In the air-cooled large outdoor unit, since a large amount of refrigerant is cooled by the outdoor unit, correspondingly various components must be installed.

Particularly, in order to compress the refrigerant in a large amount, a large compressor is mounted inside the outdoor unit, and an inverter device suitable for driving the large compressor is provided. On the other hand, since the inverter device performs a high-speed switching operation, a large amount of heat is generated, and when the heat can not be emitted, the device is not normally operated. Conventionally, in order to solve such a problem, a separate space in which the inverter is placed is provided inside the outdoor unit, and a cooling fan for cooling a heat-generating chip such as an inverter is further provided in the space.

However, according to this conventional structure, there is a need for a separate space for installation of the inverter, so that the indoor space of the outdoor unit is lost and the outdoor unit must be larger, and a separate power source for driving the cooling fan must be consumed . Of course, problems such as wire inconvenience, difficulty in manufacturing due to the complexity of the cooling structure, rise in fabrication cost, and the like also arise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an outdoor unit which can efficiently utilize an inner space of an outdoor unit, reduce power consumption, make it easy to manufacture, lower the cost, improve operation reliability, improve heat exchange efficiency, An outdoor unit of the air conditioner that is raised, a cooling method of the outdoor unit of the air conditioner, and a cooling device of the electric box.

An outdoor unit of an air conditioner according to the present invention includes: a case; A heat exchanger disposed along a side surface of the case; A compressor placed in an inner space of the case; An electric box disposed on a front surface of the case; A substrate placed inside the electric field box; A fan which is placed on the upper surface of the case and discharges the air inside the case; And a heat sink which is in contact with a heat generating component placed on the substrate and exposed to the back surface of the electric component box and cooled by air discharged by the fan.

A heat dissipating device of an electric component box according to the present invention includes: an electric component box fastened to a door; A heat generating component placed on a substrate inside the electric field box; And a heat sink fastened to the heat generating component and the case, respectively, and exposed to the rear of the electric component box.

A cooling method of an outdoor unit of an air conditioner according to the present invention includes: a step of exchanging heat with a heat exchanger when external air is sucked; Further cooling the exothermic component by the external air heat exchanged with the heat exchanger; And a step of discharging the air that has cooled the heat generating component to the outside.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be appreciated that this is also included in the scope of the present invention.

1 is a perspective view of an outdoor unit of an air conditioner according to the present embodiment, and an internal structure of an outdoor unit is schematically shown.

1, the outdoor unit 1 of the air conditioner includes a rectangular parallelepiped case 2 having a housing space formed therein and an opening formed on a side thereof, and a compressor 9 An outdoor heat exchanger 13 placed on the four sides of the case 2 along the three sides except for the front face thereof and a case 2 placed on the upper surface of the case 2 to cool the air in the inner space of the case 2, A blowing fan 7 for blowing the air through the upper surface of the casing 2 is provided.

The operation of the outdoor unit 1 having such a configuration will be briefly described. When the blowing fan 7 is rotated, the inner space of the case 2 is formed into a negative pressure atmosphere, and air is sucked from the outside of the case 2 by the negative pressure atmosphere. The position where the air flows into the case 2 becomes three sides on which the outdoor heat exchanger 13 is placed among the side faces of the case 2 and the other portions are closed, Thereby allowing most of the air to flow through the outdoor heat exchanger 13. At this time, it is natural that the refrigerant flowing in the refrigerant pipe provided in the heat exchanger 13 is heat-exchanged. In order to increase the efficiency of the heat exchange, it is desirable that the height of the heat exchanger is provided to the same degree as the height of the case 2. In other words, the vertical height of the heat exchanger 13 is substantially the same as the vertical height of the case 2, so that the actual height of the heat exchanger can be made substantially equal to the actual height of the case 2.

The air passed through the outdoor heat exchanger (13) is discharged to the outside through the blowing fan (7) on the upper surface of the heat exchanger (13).

The configuration and operation of the outdoor unit 1 centering on the flow of air have been described above. Hereinafter, the configuration and operation of the outdoor unit 1 centering on the flow of the refrigerant will be described.

The outdoor unit (1) is provided with a first indoor side duct (8) connected to the indoor unit and through which the refrigerant passed through the indoor unit flows into the outdoor unit side, a compressor (9) for compressing the refrigerant, Dividing devices 11 and 17 for dividing the refrigerant branched once through the dividing device 10 into individual refrigerant pipes of the heat exchanger 13, A heat exchanger 13 which is divided by the distributors 11 and 17 and exchanges the refrigerant supplied through each of the connection ducts 12 and a refrigerant heat exchanged by the heat exchanger 13 And a second indoor side duct 14 which is a duct.

The refrigerant introduced through the first indoor side pipeline 8 is compressed by the compressor 9, and it is general that a high-pressure gaseous refrigerant-a liquid refrigerant is included to some extent. The compressed refrigerant is introduced into the heat exchanger 13. The heat exchanger 13 has a large number of refrigerant tubes so that a large amount of heat can be exchanged. Respectively. In order to provide such a refrigerant distribution structure, a dividing device 10 is provided so that a large amount of refrigerant is branched, and a distributor 11 (17) is further provided on the downstream side of the dividing device 10, ) Are respectively introduced into the refrigerant pipes of the heat exchanger.

The refrigerant heat-exchanged with the air via the heat exchanger (13) is returned to the indoor unit through the second indoor side duct (14).

The outdoor unit 1 of the present embodiment has a large capacity and the capacity of the compressor 9 must have an output of a certain level or more in order to improve the reliability of the refrigerant flow and the efficiency of heat exchange as described, And the heat exchanger is provided with many stages of refrigerant pipes extending vertically.

Further, although not described in detail, a gas-liquid separator (not shown) may be further provided in the accommodation space inside the case 2 to enhance the stability of the heat exchange system.

The mechanical structure of the outdoor unit will be mainly described.

The case 2 is provided with a top plate 3 on which a blowing fan 7 is mounted as a rectangular parallelepiped and a side plate 5 and a back plate 4 and a bottom plate 7 which are placed on both sides. A front plate 6 is provided on the front surface of the case 2. The front panel 6 further includes an electric box 15 in which electrical components are accommodated and a heat sink 16 is provided behind the electric box 15 so that the electric box 15 and the front panel 6 ) - are provided in the form of being exposed to the back side of the vehicle. The heat sink 16 is exposed to the rear surface of the front plate 6 so that the heat sink 16 can be cooled by the air that has passed through the air-heat exchanger flowing in the inner space of the case 2 do.

The front plate 6 is rotatably mounted to one side edge of the case 2 by a hinge 18. [ Therefore, the user can conveniently use the outdoor unit 1 when repairing the interior of the outdoor unit 1 or performing other maintenance work by the operation of opening and closing the front plate 6. It is preferable that the electric component box 15 can be seen through the front of the front panel 6 in a convenient manner. Therefore, it is preferable that a door is provided at a position where the front plate 6 is aligned with the electric box 15 so that the door can be opened. Of course, it is also possible to easily open the other part of the electric box 15. However, it is more preferable that the front surface of the front plate 6 is opened so that the user does not need to open the front plate 6 will be.

Fig. 2 is a rear perspective view of the front plate according to the present embodiment, showing a state in which the heat sink is fastened.

Referring to FIG. 2, an electric box 15 is provided on the rear surface of the front plate 6, and a board 21 is mounted in the electric box 15. The board 21 is a place where electrical parts requiring operation of the outdoor unit 1 are installed. An electric wire may be drawn into the electric box 15. As described above, the front box 15 is provided with an open structure, so that the user can easily repair the substrate 21 and the like.

Also, on the substrate 21, heat generating chips 21 and 22, which can be exemplified by inverters, which generate a signal for driving the compressor 9, are disposed. The rear face of the front box 15 aligned with the heat generating chips 21 and 22 is opened to form the openings 23 and 25. The heat sink 16 is brought into contact with the upper surface of the chips 21 and 22 exposed through the openings 23 and 25. Here, the heat sink 16 absorbs heat generated from the chip and discharges the heat to the outside. In this embodiment, the cooling air of the heat sink 16 will be performed by the air that has passed through the heat exchanger 13.

The substrate 21 is fixed to the inside of the electric box 15 so that the reliability of contact between the chips 21 and 22 and the heat sink 16 is improved. The upper surface of the chip is drawn to a back surface of the electric box 15 by a predetermined length while the chip is placed on the substrate 21. When the heat sink 16 is fastened to the electric box 15 in this state, the chip and the heat sink are completely in contact with each other due to the elasticity of the substrate 21.

The heat sink 16 is fastened not only to the electric box 15 but also to the chips 21 and 22. The tightening with the electric box 15 is mainly performed to firmly support the weight of the heat sink 16. The tightening with the chip is made so that the contact between the chip and the heat sink is made firm have. To this end, the heat sink 16 is provided with a fastening hole 28, a case fixing hole 24 is provided in the electric box, and a chip fixing hole 26 is provided in the chips 21 and 22 . The case fixing hole 24 is provided at a position corresponding to the four corners of the quadrangular heat sink 16 for firmly fastening the outer edge of the heat sink 16, 26 are preferably provided at least two or more in order to improve reliability of contact with the heat sink 16.

A thermal compound 27 may be placed on the upper surface of the chip before the heat sink 16 is tightened to improve the reliability of the thermal contact between the chips 21 and 22 and the heat sink 16 . The thermal compound is a material for improving the thermal conductivity and acts on the contact surface of another article to improve the thermal contact coefficient.

On the other hand, the two chips are provided because the capacity of the compressor is increased, so that a single chip may be insufficient for operation of the compressor. In this case, the first chip 21 and the second chip 22, which are spaced apart from each other by a predetermined distance in the vertical direction below the first chip 21, are provided. In this case, the heat generated by the chips 21 and 22 is different from each other, and the amount of heat generated by the first chip 21 is lower than that generated by the second chip 22. In other words, the output of the first chip 21 is lower than that of the second chip 22.

The arrangement of the first chip 21 and the second chip 22 is such that both the first chip 21 and the second chip 22 have a structure of a semiconductor package, Temperature of the first chip 21 is relatively low and the heat load of the first chip 21 is small and the heat generated by the second chip 22 is high and the heat load is high. In other words, the higher the thermal load, the higher the cooling performance. Therefore, the second chip 22 is first cooled within a range as far as possible, and the air used for cooling the second chip 22 is cooled down to the first chip 21, In order to cool the liquid. In another case, it may be considered that the first chip 21 and the second chip 22 are separated from each other in the horizontal direction. However, considering the size and shape of the heat sink 16 and the flow state of the air, it is most preferable to be presented in the preferred embodiment.

In addition, the heat sink 16 is provided with a plurality of fins extending in the vertical direction - the vertical direction. This is for the purpose of improving the cooling efficiency of the fins provided to the heat sink by the flow of the air that flows into the case 2 because the air flows upward. In addition, although the heat sink 16 provided in the present embodiment should have a size larger than a predetermined size in consideration of the heat load of the chips 21 and 22 and the cooling load, the larger the size of the heat sink 16 There is a problem that the price becomes high and the handling becomes difficult. In view of such a problem, in this embodiment, the thickness of the fin extending in the up-and-down direction is made as thin as possible in the heat sink 16 so as to enlarge the area in contact with the air as much as possible. In the case where an impact is applied to the heat sink 16 In order to prevent breakage of the heat sink 16 that may occur, the fins provided on the outer periphery of the heat sink 16 are thicker than the thickness of the inner fins.

Hereinafter, the operation of the cooling unit of the electric box cooling the heat generated inside the electric box and the operation of the outdoor unit of the air conditioner to which such a method is applied are shown in horizontal and vertical sections Will be described in detail.

FIG. 3 is a horizontal sectional view of the outdoor unit according to the present embodiment, and FIG. 4 is a vertical sectional view of the outdoor unit according to the present embodiment.

3 and 4, outside air is introduced into the case 2 due to the negative pressure atmosphere provided by the blowing fan 7. The inflow of the outside air is made to be the side plates 5 and the back plate 4 facing each other and the air introduced through each of the plates 4 and 5 performs the heat exchange action with the heat exchanger 13 do. By this operation, the air undergoes a certain degree of temperature change so that it is generally warmer than the outside air, but it is a sufficient temperature to cool the heat sink 16. In the figure, arrows are shown in the flow direction of the air to cool the heat exchanger (13). The air used for cooling the heat exchanger 13 moves upward in the direction of the upward direction.

On the other hand, the air moving through the three sides of the case substantially collides with the center of the case 2 to form a turbulent flow. The heat sink 16 is mounted on a central portion of the case 2 in which the turbulence is formed. Therefore, the convection phenomenon of the heat sink 16 is further promoted by the turbulence, and the advantage that the cooling efficiency is improved can be expected. In addition, when the outdoor unit 1 is operated by the evaporator, condensed water may be generated in the heat exchanger 13. In this case, the condensed water may flow into the case 2 along with the air flow. In order to prevent the condensed water from reaching the heat sink 16 in such a case, the heat sink 16 and the electric box 15 further include a central portion of the front plate 6, that is, . The central portion of the case 2 is the farthest distance from the overall heat exchanger 13 so that the condensed water generated in the heat exchanger 13 flows into the inside of the electric box 15 via the heat sink 16. [ The possibility of influx is reduced.

On the other hand, the electric box 15 is shown as being located at the center when the front plate 6 is divided into third and fourth portions. This is because the lower portion of the front plate 6 has a problem that the cooling efficiency can not be secured because the flow rate of the air is small due to the no-slip condition of the fluid, so that sufficient cooling performance can not be secured. Since the upper portion of the front plate is provided with the blowing fan 7, not only is the installation space short, but also because the flow rate of the air passing through the space is small because it is the corner portion of the case, Because. The reason for this is that a portion of the electric box 15 in which a large amount of turbulence is generated is preferably proposed.

5 is a block diagram illustrating a cooling method of the outdoor unit of the air conditioner according to the present embodiment.

5, when a blowing fan is rotated by an external power source (S1), air is introduced into the case 2 through the side plate 5 and the rear plate 4 by a negative pressure atmosphere formed inside the case 2 (S2).

The air introduced through the case is primarily subjected to heat exchange with the heat exchanger 13 to undergo a temperature change to some extent (S3). After the heat exchange, the heat sink 16 is cooled (S4) together with a large number of parts placed inside the case after being introduced into the inner space of the case 2.

Here, although the air that has passed through the heat exchanger 13 may be a certain high temperature atmosphere, it is still air at a sufficient temperature to cool the heat sink 16. Since the approximate heat-resistant temperature of the chips 21 and 22 is 100 degrees Celsius, the air passing through the heat exchanger 13 will not reach this temperature. In addition, since the position and the installation structure of the electrical component box 15 are optimized, the cooling efficiency of the heat sink 16 by the air passing through the heat exchanger 13 is further enhanced. Therefore, the chip 21 22 is not a problem at all.

After cooling the heat sink 16, the heat sink 16 is directed upward toward the blowing fan 7 and then discharged to the outside through the top plate.

The preferred embodiments of the present invention have been described in detail above. However, the spirit of the present invention may further encompass a plurality of different embodiments in addition to the above-described preferred embodiments, which will be described in further detail below.

In order to expose the chip to the outside of the electric box, the opening provided in the electric box is processed for each chip. However, the present invention is not limited to this, and all chips may be exposed to the outside It is also possible to consider that it is provided in the size of a certain degree. However, in this case, there is a problem that the possibility of water flowing into the electric box through the space between the heat sink and the case is increased, and the strength of the electric box is lowered. Therefore, it is more preferable to be provided in the preferred embodiment.

In addition, although the heat exchanger is illustrated as being installed on three sides, it may be provided on the front surface of the case, that is, a position where the front plate should be placed. For example, the front plate may be placed on a part of the case rather than the entire surface, and the heat exchanger may be placed on a portion where the front plate is missing. Accordingly, it is easy to predict that the installation area of the heat exchanger increases accordingly and the heat exchange efficiency can be increased. However, in this case, since the heat exchanger must be bent all over again, the manufacturing process of the heat exchanger becomes complicated and difficult. Therefore, it is more preferable to produce it as shown in the preferred embodiment. Further, in order to maximize the convenience of manufacturing, it is possible to install only the heat exchanger on two sides. In this case, the heat exchanging efficiency will be somewhat lowered, but the manufacturing convenience of the heat exchanger is naturally enhanced.

According to the present invention, it is possible to efficiently use the inner space of the outdoor unit, to reduce the power consumption, to make it easier to manufacture, to lower the cost, to improve the operation reliability, to improve the heat exchange efficiency, There is an advantage that the cooling efficiency is increased.

Claims (13)

case; A heat exchanger installed on both inner and outer sides of the case; A compressor located in an inner space of the case and connected to the heat exchanger; An electric box provided on a front surface of the case; A board provided inside the electric box; A fan which is placed on the upper surface of the case and flows air from the lower part of the substrate to the upper part and discharges the air to the outside; And And a heat sink which is in contact with a plurality of heat generating parts provided on the board and is exposed to the rear surface of the electric component box and cooled by air flowing by the fan, Wherein a plurality of the heat generating components are installed on the upper and lower sides of the substrate and the lower heat generating component is higher in heat generation amount than the upper heat generating component. delete delete delete delete delete delete delete delete delete delete delete delete

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