JP2010261622A - Air conditioning unit use side unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool electric components at low costs, and to improve reliability in the cooling. <P>SOLUTION: This use-side unit 20 of the air conditioning device is equipped with: a casing 200 in which a use-side heat exchanger 260 is disposed; an inlet 202 formed on the casing 200 for sucking the indoor air; an outlet 201 formed on the casing 200 for supplying the conditioned air; a main ventilation flow channel 290 formed in the casing 200 from the inlet 202 toward the outlet 201 and having the use-side heat exchanger 260 between the inlet 202 and the outlet 201; a fan 270 disposed in the casing 200 and forming the air flow in the main ventilation flow channel 290 from the inlet 202 toward the outlet 201; and an electric component box 280 disposed in the casing 200 and receiving the electric components. At least a part (282) of the electric component box 280 is positioned in the main ventilation flow channel 290. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooling technique for electrical components provided in a use side unit of an air conditioner.

  In order to reduce the size of the air conditioner, the components of the air conditioner are often arranged densely inside the casing of the air conditioner. In particular, an electrical component box that houses electrical components such as a power module for driving a control microcomputer of an air conditioner and an inverter motor of a compressor is inevitably disposed according to the positional relationship between the air outlet and the air inlet. Unlike a fan or a heat exchanger in which the distance is determined, there are few restrictions on the arrangement position, so that it is pushed into the surplus space inside the casing.

  For example, the air conditioner for windows disclosed in Patent Document 1 has an interior of the air conditioner divided into an indoor ventilation circuit and an outdoor ventilation circuit by a partition plate. An electrical component box (described as an electrical box in Patent Document 1) is provided with a fan, and is pushed into a space between the partition plate and the indoor ventilation circuit together with a compressor. .

  Since the electrical components such as the control microcomputer and the power module stored in the electrical component box are heat generating components, the waste heat of the electrical component is transferred to the outside of the electrical component box in order to prevent malfunction and failure of the air conditioner. It is necessary to dissipate heat. In the window air conditioner disclosed in Patent Literature 1, the electrical component box is connected to the interior side of the air conditioner main body and the electrical component box, and the electrical component box and the chamber. An opening passage B communicating with the inner ventilation circuit is formed. In this air conditioner, indoor air flows into the electrical component box from the opening passage A, passes through the electrical component box, and flows out from the opening passage B to the indoor ventilation circuit. The electrical components inside the electrical component box are cooled.

JP-A-60-226640

  However, since the airflow flowing from the opening passage A to the opening passage B is generated by the suction force of the fan located in the indoor side ventilation circuit away from the opening passage A and the opening passage B, the airflow The air volume is smaller than the air volume of the airflow flowing through the indoor ventilation circuit. For this reason, there is a case where a sufficient air volume is not ensured to dissipate the waste heat. Further, since other components are densely packed around the electrical component box, the airflow that passes through the electrical component box cannot be secured as in the air conditioner disclosed in Patent Document 1, the waste Heat dissipation becomes more difficult.

  For this reason, for example, a fan may be attached to the electrical component box to cool the electrical component, but the life of the fan is that the life of the air conditioner is more than ten years. Often as short as several years. For this reason, in this cooling method, the time and money costs for replacing the fan are increased, and the reliability of the air conditioner is reduced due to the cooling of the electrical components because the fan is stopped. There is a risk of

  The present invention has been made to solve such a problem, and is capable of cooling an electrical component at low cost and efficiently, and uses an air conditioner that can ensure the reliability of the cooling. The purpose is to provide a side unit.

  A utilization side unit of an air conditioner according to claim 1 of the present invention includes a casing in which a utilization side heat exchanger is disposed, an intake opening that is opened in the casing and into which indoor air is sucked, and is opened and harmonized in the casing. An air outlet from which air is blown out, a main ventilation flow which is provided in the casing and faces from the inlet to the outlet and the use side heat exchanger is located between the inlet and the outlet. A passage, a fan provided in the casing and forming an air flow in the main ventilation flow path from the inlet to the outlet, and an electric component provided in the casing and accommodating an electric component And at least a part of the electrical component box is provided in the main ventilation channel.

  According to the first aspect of the present invention, since at least a part of the electrical component box is provided in the main ventilation channel, the electrical component disposed in the part of the electrical component box Is cooled by the air flow in the main ventilation channel from the inlet to the outlet. Therefore, it is possible to efficiently cool the electrical component disposed in the part of the electrical component box without using a cooling mechanism such as a fan having poor reliability. Therefore, it becomes possible to cool the electric component efficiently at low cost, and furthermore, since the reliability of the cooling can be ensured, the reliability of the air conditioner can be improved.

  The use side unit of the air conditioner according to claim 2 of the present invention is the use side unit of the air conditioner according to claim 1, wherein the one of the electrical component boxes provided in the main ventilation channel is provided. The part is located between the suction port and the use side heat exchanger.

  The use side unit of the air conditioner according to claim 3 of the present invention is the use side unit of the air conditioner according to claim 2, wherein the part of the electrical component box is orthogonal to the opening surface of the suction port. It is provided in the suction port so as to be visible when viewed from the front.

  According to the invention which concerns on Claim 2 or 3, the said electrical component arrange | positioned by the said one part of the said electrical component box provided in the said main ventilation flow path is the inside of the said utilization side heat exchanger. Cooled by indoor air before heat exchange with flowing refrigerant. Therefore, in both the cooling operation and the heating operation, the electrical component disposed in the part of the electrical component box can be efficiently cooled.

  The utilization side unit of the air conditioning apparatus according to claim 4 of the present invention is provided in the utilization side unit of the air conditioning apparatus according to any one of claims 1 to 3, being located in the main ventilation channel. At least the power module of the compressor is located in the part of the electrical component box.

  According to the invention which concerns on Claim 4, the power module of the compressor with much calorific value especially among the said electrical equipment parts which are heat generating parts can be located in a site | part with high cooling efficiency in an electrical component box.

  The utilization side unit of the air conditioning apparatus according to claim 5 of the present invention is the utilization side unit of the air conditioning apparatus according to claim 4, further comprising a partition plate that divides the inside of the casing into an upper space and a lower space. The suction port is opened to the casing at a position where the outside of the casing communicates with the upper space, and the outlet is opened to the casing at a position where the outside of the casing communicates with the upper space; The main ventilation channel is formed in the upper space.

  According to the invention which concerns on Claim 5, a compressor etc. can be arrange | positioned in the said lower space, and most of the said upper space can be ensured as the said main ventilation flow path. Therefore, the ventilation resistance in the main ventilation channel can be reduced, and the efficiency of the air flow in the main ventilation channel can be increased. Therefore, the efficiency of air conditioning can be improved.

  The use side unit of the air conditioner according to claim 6 of the present invention is the use side unit of the air conditioner according to claim 5, wherein the electrical component box is provided through the partition plate, and the electrical component box The part is located in the upper space and in the main ventilation channel.

  According to the invention according to claim 6, among the electrical components, the power module of the compressor having a particularly large calorific value is located in the main ventilation channel in the upper space, while the other electrical components are Located in the lower space. Therefore, it is possible to achieve both cooling of the power module of the compressor, which is an electrical component with a large amount of heat generation, and improving the efficiency of air conditioning by reducing the ventilation resistance in the main ventilation channel. Can do.

  The use side unit of the air conditioner according to claim 7 of the present invention is the use side unit of the air conditioner according to claim 6, wherein the opening is opened at the casing position for communicating the outside of the casing and the lower space. A lower opening opened in a portion located on the lower space side in the electrical component box, an upper opening opened in an upper portion of the portion located in the upper space in the electrical component box, and the electrical component In the box, the sub-ventilation flow path from the lower opening to the upper opening, and the indoor air sucked from the opening flows into the electrical component box from the lower opening and flows out from the upper opening. And comprising.

  According to the invention of claim 7, the indoor air sucked from the opening flows into the electrical component box from the lower opening and flows out from the upper opening. That is, since the room air passes through the interior of the electrical component box, the electrical component in the electrical component box can be cooled more effectively.

  The utilization side unit of the air conditioning apparatus according to claim 8 of the present invention is the utilization side unit of the air conditioning apparatus according to any one of claims 5 to 7, wherein the casing has a rectangular parallelepiped, and the suction port is Opened on one side of the rectangular parallelepiped, the outlet is opened on the top surface of the rectangular parallelepiped.

  According to the invention which concerns on Claim 8, the dead space around a utilization side unit can be reduced by making the said casing into a rectangular parallelepiped.

  According to the present invention, it is possible to efficiently cool the electrical component arranged in the part of the electrical component box without using a cooling mechanism such as a fan having poor reliability. Therefore, it becomes possible to cool the electric component efficiently at low cost, and furthermore, since the reliability of the cooling can be ensured, the reliability of the air conditioner can be improved.

It is a schematic block diagram of an air conditioning apparatus provided with the utilization side unit which concerns on one Embodiment of this invention. It is a perspective view which shows the external appearance of the utilization side unit which concerns on one Embodiment of this invention. (A) shows the appearance on the front side, and (B) shows the appearance on the back side. It is a perspective view which shows the state which removed all the panels of the front side of a use side unit, and exposed the inside of a casing. It is the side view which illustrated the inside of a casing from the IV direction of FIG. It is a perspective view which shows the penetration state of the electrical component box with respect to a partition plate. It is a perspective view which shows the external appearance of a partition plate. It is a perspective view which shows the external appearance of the back side of the part located in the upper space of an electrical component box. It is a side view which shows the state with which the refrigerant regulator provided in a heat-source side unit was joined with the piping assembly. It is a front view of the refrigerant regulator seen from the IX direction of FIG. It is a top view of the refrigerant regulator seen from the X direction of FIG.

  Hereinafter, the use side unit 20 of the air-conditioning apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. First, based on FIG. 1, the outline of the air conditioning apparatus 1 provided with the utilization side unit 20 is demonstrated. FIG. 1 is a schematic configuration diagram showing a refrigerant circuit 10 in the air conditioning apparatus 1.

  The air conditioner 1 is a cooling-only air conditioner that is used, for example, to cool an IT device in a computer room. The air conditioner 1 includes a use side unit 20 as an indoor unit installed in a computer room and a heat source side unit 30 as an outdoor unit installed outside. The use side unit 20 and the heat source side unit 30 are connected to each other by the refrigerant pipe 100 to constitute the refrigerant circuit 10. The air conditioner 1 is a so-called remote condenser system in which a compressor 210 and a heat source side heat exchanger 320 functioning as a condenser are provided dispersedly in a use side unit 20 and a heat source side unit 30. By providing the compressor 210, which is a noise source, in the use-side unit 20 that is normally installed in a computer room that is unattended, noise countermeasures for the outdoor environment are provided.

  The usage side unit 20 includes a compressor 210, an electronic expansion valve 250, a usage side heat exchanger 260, and a fan 270.

  The compressor 210 is, for example, an inverter-controlled scroll compressor that is driven so that its capacity can be adjusted by changing the drive frequency. The compressor 210 compresses the low-pressure gas refrigerant until it reaches a critical pressure or higher.

  A discharge pipe temperature sensor 214 and a high pressure sensor 211 are provided on the discharge side pipe of the compressor 210. The discharge pipe temperature sensor 214 detects the temperature of the high-pressure gas refrigerant after being compressed by the compressor 210. The high pressure sensor 211 detects the pressure of the high pressure gas refrigerant after being compressed by the compressor 210. A suction pipe temperature sensor 215 and a low pressure sensor 212 are provided on the suction side piping of the compressor 210. The suction pipe temperature sensor 215 detects the temperature of the low-pressure gas refrigerant sucked into the compressor 210. The low pressure sensor 212 detects the pressure of the low pressure gas refrigerant sucked into the compressor 210. Based on the measured values of these sensors, a control microcomputer provided in the electrical component box 280 described later controls the rotational speed of the compressor 210 and the rotational speeds of the fan 270 and the fan 320 described later. Is cooled to the set temperature.

  In addition, the discharge side piping of the compressor 210 is provided with a high pressure switch 213 in addition to the above sensor. The high-pressure pressure switch 213 is a switch that opens its electrical contact when the pressure of the high-pressure gas refrigerant discharged from the compressor 210 becomes abnormally high (high-pressure abnormality). When the contact is opened, the compressor 210 stops and refrigerant circulation in the refrigerant circuit 10 stops.

  The electronic expansion valve 250 is an electrically operated valve with an adjustable opening degree provided on the upstream side of the use side heat exchanger 260. The electronic expansion valve 250 squeezes and expands the high-pressure liquid refrigerant condensed in the heat source side heat exchanger 320 described later, and flows into the use side heat exchanger 260.

  The use side heat exchanger 260 is, for example, a cross fin type fin-and-tube heat exchanger, and functions as an evaporator in the air conditioning apparatus 1 dedicated to cooling. A flow divider 26 is provided on the upstream side of the use side heat exchanger 260. The flow divider 26 distributes the refrigerant in the gas-liquid mixed state, which has been throttled and expanded by the electronic expansion valve 250, to a plurality of paths (three in this embodiment) of the use side heat exchanger.

  The fan 270 sucks the air in the computer room into the use side unit 20, exchanges heat between the refrigerant flowing in the use side heat exchanger 260 and the room air, and converts the room air after the heat exchange into conditioned air. To blow out the unit. In this embodiment, two fans 270 are provided and are driven to rotate by a common fan motor 271.

  Furthermore, the use side unit 20 is provided with a closing valve 28 at the connection port with the local piping 102 serving as the gas side piping and a closing valve 29 at the connection port with the local piping 103 serving as the liquid side piping. A filter 27 is disposed at a key point of the refrigerant pipe 100 in the use side unit 20 for the purpose of protecting the electronic expansion valve 250 and the like.

  The heat source side unit 30 includes a heat source side heat exchanger 320, an electronic expansion valve 330, a refrigerant regulator 340, and a fan 350.

  The heat source side heat exchanger 320 is, for example, a cross fin type fin-and-tube heat exchanger similar to the use side heat exchanger 260, and functions as a condenser in the air conditioning apparatus 1 dedicated to cooling. The high-temperature and high-pressure gas refrigerant compressed by the compressor 210 is condensed by exchanging heat with outdoor air in the heat source side heat exchanger 320 to become a low-temperature and high-pressure liquid refrigerant.

  The electronic expansion valve 330 is a motor-operated valve that is provided on the downstream side of the heat source side heat exchanger 320 and whose opening degree is adjustable. By increasing or decreasing the opening degree of the electronic expansion valve 330, the amount of the gas refrigerant flowing into the use side heat exchanger 320 is adjusted.

  The fan 350 sucks outdoor air into the heat source side unit 30, exchanges heat between the refrigerant flowing through the heat source side heat exchanger 320 and the outdoor air, and then transfers the heat-exchanged air from the heat source side unit 30. Drain outside. The fan 350 is rotationally driven by a fan motor 351.

  Similar to the use side unit 20, the heat source side unit 30 has a closing valve 38 at the connection port with the local piping 102 serving as the gas side piping, and a closing valve 39 at the connection port with the local piping 103 serving as the liquid side piping. , Each provided. Further, the filter 37 is disposed at the main part of the refrigerant pipe 100 in the heat source side unit 30 for the purpose of protecting the electronic expansion valve 330 and the like, similarly to the usage side unit 20.

  Note that a check valve 35 and a pressure adjustment valve 36 are provided in parallel in the refrigerant pipe positioned between the closing valve 39 and the refrigerant regulator 340. The pressure regulating valve 36 is a valve provided to protect the local piping 103 and is opened at a pressure exceeding a predetermined reference pressure value. That is, when the air conditioner 1 is stopped, when the liquid refrigerant sealed in the local pipe 103 serving as the liquid side pipe expands due to the temperature rise and the pressure exceeds the reference pressure value, the pressure regulating valve 36 is opened. As a result, the liquid refrigerant escapes to the refrigerant regulator 340, so that the local pipe 103 is protected from high pressure.

  The refrigerant regulator 340 is a cylindrical tank that stores high-pressure liquid refrigerant condensed through the heat source side heat exchanger 320 (see FIGS. 8 to 10). Refrigerant flowing through the use-side heat exchanger 260 and the use-side heat exchanger 320 due to changes in the room temperature of the computer room in which the use-side unit 20 is installed and changes in the temperature outside the room in which the heat-source-side unit 30 is installed. The temperature of the refrigerant also varies, and the amount of circulation of the refrigerant in the refrigerant circuit 10 also varies. The refrigerant regulator 340 stores the high-pressure liquid refrigerant so as to absorb the fluctuation in the circulation amount and adjust the refrigerant amount circulating in the refrigerant circuit 10.

  In addition, the capacity | capacitance of the refrigerant | coolant regulator 340 is set as the capacity | capacitance which can collect | recover most of the refrigerant | coolants which circulate through the air conditioning apparatus 1. FIG. When the air conditioner 1 is installed or updated, the refrigerant charged into the air conditioner 1 and the refrigerant recovered from the air conditioner 1 are stored in the refrigerant regulator 340 and then charged or recovered. .

  Next, the structure of the use side unit 20 will be described below. 2 is a perspective view showing the appearance of the usage-side unit 20, FIG. 2A shows the appearance of the usage-side unit 20 on the front side, and FIG. 2B shows the appearance of the usage-side unit 20 on the back side. , Respectively. FIG. 3 is a perspective view showing a state in which all the panels on the front side of the use side unit 20 are removed and the inside of the casing 200 is exposed. FIG. 4 is a side view illustrating the inside of the casing 200 from the IV direction of FIG. 3. 2 to 4, illustration of refrigerant piping such as refrigerant piping connecting the compressor 210 and the use side heat exchanger 260 is omitted.

  The usage-side unit 20 includes a compressor 210, a usage-side heat exchanger 260, a fan 270, and an electrical component box in a casing 200 that has a substantially rectangular parallelepiped shape whose height direction is the longest in the installed state and whose width direction is longer than the depth. This is a floor-standing indoor unit configured to accommodate H.280. The casing 200 has an air outlet 201, an inlet 202, and openings 203 to 205. By setting the casing 200 to the above-described shape, the dead space around the usage-side unit 20 can be reduced.

  The inside of the casing 200 is partitioned into an upper space S1 and a lower space S2 by a partition plate 206. In the upper space S1, a use side heat exchanger 260 and a fan 270 are accommodated, and a main ventilation channel 290 is provided. The compressor 210 is accommodated in the lower space S2. The electrical component box 280 passes through the partition plate 206 and is accommodated across both the upper space S1 and the lower space S2. In other words, the electrical component box 280 includes a first electrical component box 281 and a second electrical component box 282. The first electrical component box 281 is accommodated in the lower space S2, and the second electrical component box 282 includes the first electrical component box 282. It is provided by being stacked on the upper part of the product box 281, penetrates the partition plate 206 and is accommodated across both the upper space S <b> 1 and the lower space S <b> 2, and most of it is accommodated on the upper space S <b> 1 side.

  In addition, in order to maintain each component apparatus accommodated in the use side unit 20, the front side of the use side unit 20 is made into three removable panels arranged in the height direction. The three panels are removed in order from the lower panel, and the panel P1 that allows access to the compressor 210 and the first electrical component box 281 provided in the lower space S2 by being removed from the lower panel, and the almost entire surface of the suction panel 202 is the inlet 202. The panel P2 that allows access to the second electrical component box 282 provided in the upper space S1 by being removed and the fan 270 provided in the upper space S1 can be accessed by being removed. It is comprised from the panel P3.

  The suction port 202 is located on the front surface of the casing 200 directly above the partition plate 206, that is, in the center of the front surface of the casing 200, and is opened by forming a grill on almost the entire surface of the panel P2. That is, the panel P2 functions as a removable suction grill. This opening position is a position where the outside of the casing 200 communicates with the upper space S1. In this embodiment, the opening area of the suction port 202 is approximately one third of the area of the front surface of the casing 200.

  Two air outlets 201 are opened on the top surface of the casing 200 and are located at both ends in the width direction of the top surface of the casing 200. This opening position is a position where the outside of the casing 200 communicates with the upper space S1 in the same manner as the suction port 202. In the present embodiment, the opening area of one air outlet 201 is approximately one third of the area of the top surface of the casing 200.

  The main ventilation flow path 290 is a flow path of an air flow from the suction port 202 to the blower outlet 201. A use side heat exchanger 260 is provided between the inlet 202 as an inlet of the main ventilation channel 290 and the outlet 201 as an outlet. The indoor air sucked from the suction port 202 exchanges heat with the refrigerant flowing through the use side heat exchanger 260 to become conditioned air, and the conditioned air is blown out from the outlet 201. In order to increase the heat exchange area, in the side view of the casing 200, the use side heat exchanger 260 extends from the front side to the back side from directly above the suction port 202 on the front surface of the casing 200 to just above the opening 205 on the back surface of the casing 200. It arrange | positions so that it may descend | fall and incline.

  The fan 270 is, for example, a sirocco fan provided in the upper part of the upper space S1, and is arranged so that the opening on the blowout side of the casing faces the blower outlet 201. That is, in this embodiment, the fan 270 is provided in each of the two blower outlets 201. The fan 270 is rotationally driven by a common fan motor 271 and forms an air flow in the main ventilation flow path 290 from the suction port 202 toward the blower outlet 201.

  The openings 204 are opened on both side surfaces of the casing 200 so as to be located immediately above the partition plate 206 and directly below the use side heat exchanger 260. The opening 205 is opened on the back surface of the casing 200 so as to be located immediately above the partition plate 206 and directly below the use side heat exchanger 260. In addition to the suction port 202, the opening 204 and the opening 205 are provided so that the indoor air flows from the side surface and the back surface of the casing 200 toward the use side heat exchanger 260. The frictional resistance between the flowing suction air and the inner wall surface of the casing 200 can be reduced. Therefore, the air volume of the conditioned air can be secured while reducing the power of the fan 270.

  The electrical component box 280 includes the first electrical component box 281 and the second electrical component box 282 as described above. The first electrical component box 281 is a large sheet metal casing having a substantially rectangular parallelepiped shape, and constitutes most of the volume of the electrical component box 280. The electrical component box 280 occupies approximately a half volume of the right side of the lower space S2 in the front view of the usage-side unit 20 (see FIG. 3) and accommodates most of the electrical components.

  The second electrical component box 282 is a small metal plate casing having a substantially rectangular parallelepiped shape, and accommodates at least the power module of the compressor 210. The second electrical component box 282 is provided to be stacked on the upper portion of the first electrical component box 281, penetrates the partition plate 206 and is located across both the upper space S1 and the lower space S2, and most of the second electrical component box 282 is provided. Located on the upper space S1 side. In the upper space S <b> 1, the second electrical component box 282 is located in the main ventilation channel 290 and between the suction port 202 and the use side heat exchanger 260 in the main ventilation channel 290. The arrangement position of the second electrical component box 282 is a position where the second electrical component box 282 can be visually recognized in the suction port 202 in a front view from a direction orthogonal to the opening surface of the suction port 202.

  By arranging the second electrical component box 282 at the above position, the air flow in the main ventilation flow path 290 from the suction port 202 to the blowout port 201 can be achieved without using a cooling mechanism such as a fan that is inferior in reliability. The second electrical component box 282 can be efficiently cooled. Therefore, it is possible to efficiently cool the power module of the compressor that generates a large amount of heat among the electrical components that are heat generating components.

  In addition, by accommodating most electrical components in the first electrical component box 281 located in the lower space, the volume of the electrical component box 280 exposed in the main ventilation channel 290 can be minimized. Therefore, while efficiently cooling the power module of the compressor that generates a large amount of heat, most of the upper space S1 is secured as the main ventilation channel 290, and the air flow efficiency in the main ventilation channel 290 is improved to improve the air flow. The efficiency of harmony can be improved.

  In addition, since the air conditioning apparatus 1 according to the present embodiment is dedicated to cooling, the second electrical component box 282 is provided between the outlet 201 and the use-side heat exchanger 260 in the main ventilation flow path 290, and indoor air It is possible to cool the second electrical component box 282 with the low-temperature conditioned air cooled. However, when this configuration is applied to a cooling / heating type air conditioner, high-temperature conditioned air heated from the indoor air is blown to the second electrical component box 282. Therefore, in the cooling / heating type air conditioner, Similarly to this embodiment, it is preferable to provide the second electrical component box 282 between the suction port 202 and the use side heat exchanger 260 in the main ventilation flow path 290.

  An opening 203 is opened at the lower part of the side surface of the casing 200 on the side where the first electrical component box 281 is located. This opening position is a position where the outside of the casing 200 communicates with the lower space S2.

  In the housing of the first electrical component box 281, the surface facing the opening 203 is a side plate 2811 from which a front half can be removed. A portion where the side plate 2811 and the casing body overlap forms a slit 281s (lower opening).

  In addition, opposed openings (not shown) are provided on the top surface of the first electrical component box 281 and the bottom surface of the second electrical component box 282, respectively, and the internal space of the first electrical component box 281 and the second electrical component box The internal space of the box 282 is an integral space. A waste heat port 2822 (upper opening) is opened at the upper back of the second electrical component box 282 (see FIG. 7).

  The internal space of the first electrical component box 281 and the internal space of the second electrical component box 282 are integrated into one space, and the opening 203, the slit 281s, and the waste heat port 2822 are formed at the above positions, respectively. In the electrical component box 280, the indoor air that is directed from the slit 281s to the waste heat port 2822 and sucked from the opening 203 flows into the electrical component box 280 through the slit 281s and flows out from the waste heat port 2822. A wind passage is formed. Therefore, the electrical components in the electrical component box 280 can be effectively cooled by the indoor air passing through the electrical component box 280.

  Since the usage-side unit 20 is an indoor unit, rainwater enters from the opening 203, and there is no risk that the rainwater enters the first electrical component box 281 provided in the lower space S2. For this reason, the cooling method using the sub-ventilation channel is reasonable.

  Needless to say, the inside of the second electrical component box 282 in which the power module of the compressor having a large amount of heat generation is accommodated is more preferably cooled. For this reason, in the present embodiment, by providing an opening 2821 located immediately above the partition plate 206 in the lower front part of the second electrical component box 282 (see FIG. 5), the room air passing through the auxiliary ventilation channel In addition, the interior of the second electrical component box 282 is also cooled by indoor air that flows in from the opening 2821 and flows out of the waste heat port 2822.

  Next, the positional relationship between the second electrical component box 282 and the partition plate 206 will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view showing a penetration state of the second electrical component box 282 with respect to the partition plate 206. FIG. 6 is a perspective view showing the appearance of the partition plate 206.

  The partition plate 206 has a notch 2061 on the right side (above the electrical component box 280) and the front side when viewed from the front in the state of being arranged in the casing 200. The shape of the notch 2061 is a shape corresponding to the cross-sectional shape of the second electrical component box 282 in plan view, and the second electrical component box 282 is partitioned by fitting the second electrical component box 282 into the notch 2061. The plate 206 will be penetrated. Note that the two openings 2062 open on the left side of the partition plate allow passage of refrigerant piping connecting the compressor 210 disposed in the lower space S2 and the use side heat exchanger 260 disposed in the upper space S1. belongs to.

  The partition plate 206 also functions as a drain pan that receives drain water that is generated by condensation of water vapor contained in room air on the surface of the use-side heat exchanger 260 and drops downward from the surface of the use-side heat exchanger 260. On the side of the partition plate 206 located on the back side of the casing 200, a drainage groove 2063 is provided over the entire width. Since the partition plate 206 is disposed so as to be slightly lowered and inclined from the front side to the back side of the casing 200, the drain water flows down on the partition plate 206 toward the drain groove 2063. become. The drain groove 2063 is inclined in a front view of the casing 200, and the drain water that has flowed into the drain groove 2063 further flows to one end of the drain groove 2063. At the one end, a drain outlet connected to a drain pipe (not shown) is provided, and the drain water is discharged through the drain pipe.

  Sealing is applied to the gap between the peripheral edge of the notch portion 2061 and the second electrical component box 282, and the drain water enters the first electrical component box 281 and the electrical components in the first electrical component box 281 are damaged. Is prevented. That is, since the drain water is surely collected by the partition plate 206 which is a drain pan by this sealing, the drain water is prevented from entering the lower space S2 and flowing to the floor surface of the computer room. The reason for such a strict measure against water leakage is that a computer room in which the use-side unit 20 is installed has an IT device that is strictly prohibited from getting wet.

  By the way, the drain water is dripped mainly from the part of the use side heat exchanger 260 located near the back surface in the depth direction of the casing 200. This is because the drain water descends through the fins arranged side by side in the vertical direction of the use side heat exchanger 260 and is blown away by the air flow of the intake air, so that the drain water moves closer to the back surface of the casing 200. This is because the surface of the use side heat exchanger 260 is moved.

  FIG. 7 is a perspective view showing the appearance of the back side of the second electrical component box 282. On the upper portion of the waste heat port 2822, a water droplet prevention cover 2823 is extended from the top surface of the second electrical component box 282. The water droplet prevention cover 2823 prevents the drain water from entering the second electrical component box 282 from the waste heat port 2822.

  Furthermore, the back surface of the second electrical component box 282 is opened, and a heat sink 2824 that is bonded to the back surface of the power module substrate of the compressor 210 protrudes from the opening. The heat sink 2824 is formed by, for example, a plurality of metal plates made of, for example, aluminum or copper, excellent in heat dissipation, suspended from the second electrical component box 282 at predetermined intervals. Since the power module substrate is mounted such that a plurality of metal plates constituting the heat sink 2824 are arranged in the vertical direction, even if the drain water adheres to the heat sink 2824, the drain water flows down to the partition plate 206. Furthermore, sealing is applied to the gap between the opening peripheral edge of the back surface of the second electrical component box 282 and the heat sink 2824 to prevent the drain water from entering the second electrical component box 282 and damaging the power module substrate. ing.

  In addition, by setting the position of the heat sink 2824 to the back side of the second electrical component box 282, it becomes easy for a service person to access the power module on the power module board during maintenance.

  The indoor air sucked from the suction port 202 flows from the front to the back of the second electrical component box 282 and flows to the heat sink 2824, whereby the power module is cooled. As described above, since the power module is also cooled by the airflow flowing inside the second electrical component box 282, a large amount of waste heat released by the power module, which is a powerful heating element, is sufficiently dissipated. .

  FIG. 8 is a side view showing a state in which the refrigerant regulator 340 is joined to the pipe assembly 101. The pipe connected to the refrigerant regulator 340 includes an introduction pipe through which the refrigerant is introduced into the refrigerant regulator 340 and a refrigerant regulator 340 in order to make the brazing operation of the pipe to the refrigerant regulator 340 efficient. The outlet pipe from which the stored liquid refrigerant is led out is a pipe assembly 101 assembled in advance.

  FIG. 9 is a front view of the refrigerant regulator 340 viewed from the IX direction of FIG. FIG. 10 is a plan view of the refrigerant regulator 340 viewed from the X direction of FIG. A support fitting 341, an outlet pipe 342, an inlet pipe 343, and a service port charge hose joint 344 are connected to the refrigerant regulator 340.

  The outlet pipe 342 is connected to the outlet pipe. That is, one end of the outlet pipe 342 located outside the refrigerant regulator 340 is flared and connected to the outlet pipe by brazing. The other end of the outlet pipe 342 located inside the refrigerant regulator 340 is opened directly above the bottom of the refrigerant regulator 340 so that the liquid refrigerant stored in the refrigerant regulator 340 can be led to the outlet pipe. ing.

  The inlet pipe 343 is connected to the outlet pipe. That is, one end of the inlet pipe 343 located outside the refrigerant regulator 340 is flared and connected to the introduction pipe by brazing. The other end of the inlet pipe 343 located inside the refrigerant regulator 340 is above the liquid level of the liquid refrigerant so that the liquid refrigerant stored in the refrigerant regulator 340 does not flow back to the introduction pipe. Is open at the position.

  The service port charge hose coupling 344 has a service port 344j on the free end side. When the air conditioner 1 is installed or updated, a charge hose is connected to the service port 344j so that the refrigerant is charged into the air conditioner 1 and the refrigerant is recovered from the air conditioner 1. In addition, the melt plug 345 is inserted into the refrigerant regulator 340 via a valve seat joint 345b welded to the refrigerant regulator 340 main body.

  The support metal fitting 341 is a substantially L-shaped metal member, and the refrigerant regulator is in a state where the L-shape is visible in a plan view shown in FIG. 340 is welded to the side. The support fitting 341 supports a part of the pipe constituting the pipe assembly 101 on the inner side (the side opposite to the side welded to the refrigerant regulator 340).

  The refrigerant regulator 340 is a heavy metal tank. A leg 346 is welded to the bottom of the refrigerant regulator 340, and the leg 346 is fixed to the casing of the heat source side unit 30 with a bolt. That is, for example, unlike the casing outer plate or the like of the removable heat source side unit 30, the refrigerant regulator 340 is a member that is firmly fixed and has weight and strength, and therefore supports the piping assembly 101 that is a heavy object. It is suitable as a mounting position for the support fitting 341.

  During the brazing operation, one end of the outlet pipe is inserted into the flare portion of the outlet pipe 342 and one end of the introduction pipe is inserted into the flare portion of the inlet pipe 343 so that the pipe assembly 101 is upright. I do. Since the pipe assembly 101 is a heavy object in which metal pipes are coupled, if the brazed part is deformed by heat during the brazing operation, the brazed part cannot support the weight of the pipe assembly 101 and the pipe assembly 101 is not supported. The piping assembly 101 may be tilted and fixed at a position different from the original arrangement position.

  In the present embodiment, a part of the pipe constituting the pipe assembly 101 is supported inside the support fitting 341. Therefore, it is possible to prevent the piping assembly 101 from being inclined during the brazing operation and being fixed at a position different from the original arrangement position.

  In the present embodiment, the pipe supported by the support fitting 341 is the outlet pipe. A portion where the filter 37 (a filter located between the check valve 35 and the refrigerant regulator 340 in FIG. 1) is inserted in the outlet pipe and the pipe diameter is increased comes into contact with the inside of the support fitting 341. An elastic member 341 s is attached to the entire inner surface of the support fitting 341 that serves as a contact surface with the pipe. Thereby, it is possible to prevent the pipe assembly 101 from being in direct contact with the metal support fitting 341 and being damaged when the heat source unit 30 is transported. Further, unlike the compressor or the like, the refrigerant regulator 340 is not a vibration generation source, and the elastic member 341s has a vibration isolating function. Therefore, chatter is generated when the refrigerant flows through the pipe assembly 101 during the operation of the air conditioner 1. Vibration is suppressed.

  According to the use side unit 20 of the air conditioner according to the embodiment of the present invention described above, the electrical components such as the power module can be efficiently cooled. In addition, since a cooling mechanism such as a fan that is inferior in reliability is not used, the reliability of cooling can be ensured. Therefore, the reliability of the air conditioner is improved.

  The use side unit 20 of the air conditioner according to the embodiment of the present invention has been described above. However, the present invention is not limited to this, and for example, the following modified embodiment can be taken.

  (1) In the above embodiment, the electrical component box 280 is configured by stacking the first electrical component box 281 and the second electrical component box 282, but the configuration of the electrical component box is not limited to this. Absent. The part in which the power module of the compressor is disposed in the electrical component box only needs to be located in the main ventilation flow path, and the electrical component box may be integrated, or may be composed of three or more electrical component boxes. Also good.

  (2) In the above embodiment, the suction port 202 is opened on the front surface of the casing 200, but the suction port may be opened on the back surface.

S1 Upper space S2 Lower space 1 Air conditioner 10 Refrigerant circuit 20 Usage side unit 30 Heat source side unit 100 Refrigerant piping 200 Casing 201 Outlet 202 Inlet 203 Opening 206 Partition plate 210 Compressor 260 Usage side heat exchanger 270 Fan 280 Electrical equipment Product box 281s Slit (lower opening)
2822 Waste heat outlet (upper opening)
290 Main ventilation channel

Claims (8)

A casing (200) in which the use side heat exchanger (260) is disposed;
An inlet (202) that is opened in the casing (200) and into which room air is sucked;
An air outlet (201) that is opened in the casing (200) and blows out conditioned air;
The use-side heat exchanger provided in the casing (200) is directed from the suction port (202) to the blower outlet (201) and between the suction port (202) and the blower outlet (201). A main ventilation channel (290) in which (260) is located;
A fan (270) provided in the casing (200) and forming an air flow in the main ventilation channel (290) from the suction port (202) toward the blowout port (201);
An electrical component box (280) provided in the casing (200) and storing electrical components;
At least a part (282) of the electrical component box (280) is a use-side unit of an air conditioner provided to be located in the main ventilation channel (290).   The part (282) of the electrical component box (280) provided in the main ventilation channel (290) is located between the inlet (202) and the use side heat exchanger (260). The utilization side unit of the air conditioning apparatus of Claim 1 located in 1.   The part (282) of the electrical component box (280) is provided so as to be visible in the suction port (202) in a front view from a direction orthogonal to the opening surface of the suction port (202). The use side unit of the air conditioning apparatus of Claim 2.   The power module of at least a compressor is located in the said part (282) of the said electrical component box (280) provided in the said main ventilation flow path (290) at least. The use side unit of the air conditioning apparatus described in 1. A partition plate (206) for partitioning the inside of the casing (200) into an upper space (S1) and a lower space (S2);
The suction port (202) is opened to the casing (200) at a position where the outside of the casing (200) communicates with the upper space (S1).
The outlet is opened to the casing (200) at a position where the outside of the casing (200) communicates with the upper space (S1).
The use side unit of the air conditioner according to claim 4, wherein the main ventilation channel (290) is formed in the upper space (S1).   The electrical component box (280) is provided so as to penetrate the partition plate (206), and the part (282) of the electrical component box (280) is the upper space (S1), which is the main passage. The utilization side unit of the air conditioning apparatus according to claim 5, which is located in the wind flow path (290). An opening (203) opened to the casing (200) position for communicating the outside of the casing (200) and the lower space (S2);
A lower opening (281s) opened in a portion located on the lower space (S2) side in the electrical component box (280);
An upper opening (2822) opened at an upper portion of the portion located in the upper space (S1) in the electrical component box (280);
Inside the electrical component box (280), the room air drawn from the opening (203) from the lower opening (281s) toward the upper opening (2822) is sucked from the lower opening (281s). A use side unit of an air conditioner according to claim 6, further comprising: a sub ventilation channel that flows into the electrical component box (280) and flows out of the upper opening (2822). The casing (200) has a rectangular parallelepiped shape,
The suction port (202) is opened at one side of the rectangular parallelepiped,
The utilization side unit of the air conditioning apparatus of any one of Claims 5-7 with which the said blower outlet (201) is opened by the top | upper surface of the said rectangular parallelepiped.

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