JP2005214613A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-air conditioner having improved air conditioning ability. <P>SOLUTION: The air conditioner comprises an outdoor unit 10 installed outdoor and having a compressor 11 and an outdoor heat exchanger 12 therein, indoor units 30a, 30b and 30c installed indoor and having indoor heat exchangers 31a, 31b and 31c therein, a distributor 20 which guides an inflow refrigerant from the outdoor unit into the indoor unit in accordance with operation conditions and guides the refrigerant having passed through the indoor unit to the outdoor unit again, and a supercooling device 100 which supercools the refrigerant subjected to the heat exchange process in the outdoor heat exchanger under isobaric conditions and then guides the supercooled refrigerant to the distributor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner with improved air conditioning capability.

  In general, an air conditioner is a device that cools or heats an indoor space such as a residential space, a cafeteria, a library, or an office room, and includes a compressor and a heat exchanger to flow a refrigerant in the room. Air conditioning.

  The air conditioner has led to the development of a multi-air conditioner that can perform cooling and heating at the same time in order to maintain a more comfortable indoor environment without being affected by the external temperature and environment. Can be cooled or heated in mode.

  In such a conventional multi-air conditioner, a plurality of indoor units are connected to one outdoor unit, each indoor unit is installed in each room, and all the rooms are either in the cooling or heating mode. Adjust indoor temperature while operating.

  However, when a conventional multi-air conditioner is applied to a place such as a high-rise building having a complicated structure and various room positions or uses, a pipe connected from the outdoor unit to the indoor unit is not suitable. There is a problem that the length of the multi-air conditioner is lowered due to the phenomenon that the pressure of the refrigerant flowing into the indoor unit decreases and the pressure decreases.

The present invention is for solving the above-described problems, and an object thereof is to provide an air conditioner having improved air conditioning capability.
Another object of the present invention is to minimize the pressure loss of the refrigerant flowing inside the refrigerant pipe caused by elongating the refrigerant pipe that guides the refrigerant, and to ensure a supercooled state of the refrigerant flowing into the expansion device. It is to provide an air conditioner to obtain.

  In order to achieve the above object, an air conditioner according to the present invention is installed outdoors, an outdoor unit having a compressor and an outdoor heat exchanger therein, an indoor unit, and indoor heat therein. An indoor unit having an exchanger, a distributor that guides refrigerant flowing from the outdoor unit to the indoor unit according to operating conditions, and again guides the refrigerant that has passed through the indoor unit to the outdoor unit, and the outdoor heat exchanger And a supercooling device that supercools the refrigerant that has undergone the heat exchange process under an isobaric condition and guides the supercooled refrigerant to the distributor.

  The subcooling device expands a part of the refrigerant that has undergone a heat exchange process in the outdoor heat exchanger, and exchanges heat between the expanded refrigerant and the remaining refrigerant that has not been expanded. To do.

  The supercooling device includes a supercooling heat exchanger in which the expanded part of the refrigerant and the remaining unexpanded refrigerant exchange heat with each other, and a part of the refrigerant that has undergone a heat exchange process in the outdoor heat exchanger. A first connecting pipe that guides the expanded refrigerant to the supercooling heat exchanger, and a second guide pipe that guides the unexpanded refrigerant to the supercooling heat exchanger. The supercooling heat exchanger is connected to a connecting pipe, a third connecting pipe for guiding the unexpanded refrigerant having passed through the supercooling heat exchanger to the distributor, and a refrigerant pipe connected to the suction end of the compressor. And a fourth connecting pipe for guiding the expanded refrigerant that has passed through.

  The supercooling heat exchanger has one end connected to the second connecting pipe, the other end connected to the third connecting pipe, the first flow pipe through which the unexpanded refrigerant flows, and one end connected to the first connecting pipe. The other end of the connecting pipe is connected to the fourth connecting pipe to exchange heat with the first flow pipe, and the second flow pipe through which the expanded refrigerant flows is configured. And

The supercooling heat exchanger has a double tube structure. More specifically, the second flow pipe is disposed in the longitudinal direction inside the first flow pipe.
Here, the refrigerant flowing along the second flow tube flows in a direction opposite to the flow direction of the refrigerant flowing along the first flow tube, or the flow direction of the refrigerant flowing along the first flow tube. It is characterized by flowing in the same direction.

The first flow tube is disposed in the longitudinal direction inside the second flow tube.
The supercooling heat exchanger configured as described above has a length of 1 m to 2.5 m.

The subcooling heat exchanger further includes a heat exchange part formed on a wall of the internal flow pipe to increase a heat exchange area.
The heat exchange part is formed to protrude inward from the inner wall of the internal flow pipe. More specifically, the heat exchange part is provided on the inner wall surface of the internal flow pipe in a circumferential direction.

The heat exchange part may be provided on the inner wall surface of the internal flow tube in the longitudinal direction, or may be provided on the inner wall surface of the internal flow tube in a spiral shape.
The expansion device is preferably composed of an electronic expansion valve.

  In addition to the above configuration, the multi-air conditioner further includes an accumulator that is provided in a refrigerant pipe connected to the suction end of the compressor and separates a gaseous refrigerant and a liquid refrigerant. It is characterized by being configured.

At this time, the fourth connecting pipe is connected to a refrigerant pipe connected to a predetermined position of the refrigerant inflow end of the accumulator.
The supercooling device is provided at a predetermined position inside the outdoor unit.

  The outdoor unit further includes a switch device that selectively switches the flow direction of the refrigerant discharged from the compressor to the outdoor heat exchanger or the distributor according to the operating conditions. To do.

  According to the present invention described above, it is possible to provide a multi-air conditioner in which some rooms can be operated in a cooling mode and other rooms can be operated in a heating mode depending on the environment of each room, and The multi air conditioner which can improve the freedom degree in installation and can maintain the supercooled state of a refrigerant | coolant can be provided.

The air conditioner of the present invention has the following effects.
First, in the air conditioner according to the present invention, even if the length of the first refrigerant pipe provided between the outdoor unit and the indoor unit becomes long, the supercooling device provides the supercooled refrigerant. Therefore, the refrigerant pressure drop is minimized, and the refrigeration capacity is improved.

  Second, since the supercooled high-pressure liquid refrigerant flows into the indoor unit of the air conditioner according to the present invention, it is possible to minimize noise generated when the refrigerant expands from the expansion unit of the indoor unit. it can.

  Third, since the pressure drop of the refrigerant flowing into the indoor unit of the air conditioner according to the present invention is minimized, the capacity of the compressor provided to the air conditioner can be minimized, and the air The unit price of the harmony machine can be saved and the volume can be minimized.

  In order to facilitate understanding of the present invention, the function of the air conditioner will be described first. The air conditioner functions to adjust air temperature, humidity, air flow, air cleanliness, and the like so that air in a specific area is adapted to the intended use. For example, it is a device that performs a function of cooling or heating indoor spaces such as residential spaces, offices, and dining rooms.

  Such an air conditioner cools the room by releasing heat to the outdoor air after the low-pressure refrigerant that has absorbed the heat in the room is compressed to a high pressure state by the compressor during the cooling operation, and The room is heated by the opposite process.

FIG. 1 is a configuration diagram showing a configuration of an air-conditioning simultaneous multi-type air conditioner according to a first embodiment of the present invention.
As shown in FIG. 1, the air-conditioning simultaneous multi-type air conditioner is mainly composed of an outdoor unit 10, a distributor 20, and a plurality of indoor units 30a, 30b, 30c installed in each room.

  The outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, an outdoor fan 13 installed on one side of the outdoor heat exchanger 12, and a refrigerant compressed by the compressor 11 according to an operation mode. A switch device 15 that selectively switches the flow direction to the outdoor heat exchanger 12 or the distributor 20 and a refrigerant pipe that is connected to the suction end of the compressor 11, and includes a gaseous refrigerant and a liquid state An accumulator 14 for separating the refrigerant is installed.

  The outdoor unit 10 of the simultaneous heating and cooling type multi-air conditioner having such a configuration allows the high-pressure refrigerant discharged from the compressor 11 to pass through the outdoor heat exchanger 12 by the switch device 15, and to distribute the distributor. A first refrigerant pipe 21 that guides the refrigerant 20, a second refrigerant pipe 22 that directly guides the refrigerant discharged from the compressor 11 to the distributor 20, and the distributor 20 and the suction end of the compressor 11. The distributor 20 is connected to the third refrigerant pipe 23 to be connected.

  The indoor units 30a, 30b, and 30c are expanded to expand the refrigerant that flows into the indoor heat exchangers 31a, 31b, and 31c and the indoor heat exchangers 31a, 31b, and 31c to a predetermined state in the cooling mode. Devices 32a, 32b, 32c are installed.

  Next, the distributor 20 directly guides the refrigerant flowing from the outdoor unit 10 to the expansion devices 32a, 32b, and 32c of the corresponding indoor unit in the case of an indoor unit that is operated in the cooling mode. In the case of an indoor unit that is operated in the mode, the indoor unit is configured to directly guide the indoor heat exchangers 27a, 27b, and 27c of the corresponding indoor unit.

  For this purpose, the distributor 20 branches from the first refrigerant pipe 21 by the same number as the indoor unit, and is connected to the expansion devices 32a, 32b, 32 of the indoor units. 21a, 21b, 21c, the second refrigerant branch pipes 22a, 22b, 22c branched from the second refrigerant pipe 22 and connected to the indoor heat exchangers 31a, 31b, 31c of the indoor units, Third refrigerant branch pipes 23a, 23b, and 23c branched from the third refrigerant pipe 23 and connected to the indoor heat exchangers 31a, 31b, and 31c of the indoor units are installed. The second refrigerant branch pipes 22a, 22b and 22c are provided with first electronic on-off valves 26a, 26b and 26c, respectively, and the third refrigerant branch pipes 22a, 22b and 22c are provided with respective first Two-electronic on-off valves 26a, 26b, and 26c are installed.

  With such a configuration, in the case of an indoor unit operated in the heating mode, the first electronic on-off valve installed in the second refrigerant branch pipe connected to the indoor unit side is opened, and the indoor unit The second electronic on-off valve installed in the third refrigerant branch pipe connected to the side is closed, and the refrigerant discharged from the compressor 11 is connected to the second refrigerant pipe 22 and the indoor unit. It passes through the refrigerant branch pipe and flows into the indoor heat exchanger of the indoor unit. In the case of an indoor unit operated in the cooling mode, the first electronic on-off valve installed in the second refrigerant branch pipe connected to the indoor unit operated in the cooling mode is closed, The second electronic on-off valve installed in the third refrigerant branch pipe connected to the indoor unit side is opened and flows into the expansion device of the indoor unit through the first refrigerant branch pipe connected to the indoor unit. The expanded refrigerant passes through the indoor heat exchanger of the indoor unit and the third refrigerant branch pipe connected to the indoor unit side, and flows into the third refrigerant pipe 23.

  The distributor 20 is provided with a bypass pipe 25 that connects the second refrigerant pipe 22 and the third refrigerant pipe 23, and the second refrigerant pipe 22 is connected to the bypass pipe 25. An electronic conversion valve 25a that converts the stagnating high-pressure refrigerant into a low-pressure refrigerant is installed to prevent the high-pressure gaseous refrigerant from being liquefied due to the stagnation when all the indoor units are operated in the cooling mode.

  On the other hand, the simultaneous heating and cooling type multi-air conditioner provided as the first embodiment of the air conditioner according to the present invention is an excess air conditioner installed in a first refrigerant pipe 21 connecting the outdoor heat exchanger 12 and the distributor 20. It further includes a cooling device 100.

  The supercooling device 100 is a device that supercools the refrigerant that has undergone the heat exchange process in the outdoor heat exchanger under an isobaric condition, and guides the supercooled refrigerant to the distributor 20. A part of the refrigerant discharged from the heat exchanger 12 is expanded, and the expanded refrigerant is discharged from the outdoor heat exchanger and flows along the first refrigerant pipe 21 to the distributor 20 side. Are exchanged with each other and then flowed into the third refrigerant pipe 23 connecting the distributor 20 and the suction end of the compressor 11. A detailed configuration of the supercooling device 100 will be described with reference to FIGS.

  In addition to the above configuration, it is desirable that the distributor 20 further includes an auxiliary supercooling device 24 having a double tube structure installed in the first refrigerant tube 21. The auxiliary supercooling device 24 functions to ensure the degree of supercooling of the refrigerant flowing into the indoor heat exchangers 31a, 31b, 31c by the heat exchange action between the refrigerants.

Next, an air conditioning selection type multi-air conditioner as another embodiment of the air conditioner according to the present invention will be described with reference to FIG.
FIG. 2 is a configuration diagram showing the configuration of this air conditioning selection type multi-air conditioner.

  The air-conditioning selection type multi-air conditioner is mainly composed of an outdoor unit 50, a distributor 60, and a plurality of indoor units 70a, 70b, 70c installed in each room, and the whole indoor unit is in a cooling mode. It is operated or the whole indoor unit is operated in the heating mode.

  The outdoor unit 50 includes a compressor 51, an outdoor heat exchanger 52, an outdoor fan 53 installed on one side of the outdoor heat exchanger 52, and refrigerant compressed by the compressor 51 according to an operation mode. A switch device 55 that selectively switches the flow direction to the outdoor heat exchanger or the distributor, a refrigerant pipe connected to the suction end of the compressor 51, and a gaseous refrigerant and a liquid refrigerant. A separate accumulator 54 is installed.

  The outdoor unit 50 of the air conditioning selection type multi-air conditioner having the above-described configuration is configured such that the high-pressure refrigerant discharged from the compressor 51 is supplied to the distributor by the switch device 55 via the outdoor heat exchanger 52. The first refrigerant pipe 61 guided to 60 and one end of the refrigerant pipe connected to the discharge end of the compressor 51 are connected directly to the distributor 60 for the refrigerant discharged from the compressor 51. The second refrigerant pipe 62 for guiding and the third refrigerant pipe 63 for connecting the distributor 60 and the suction end of the compressor 11 are connected to the distributor 20.

  Each indoor unit is provided with each indoor heat exchanger 71a, 71b, 71c and an expansion device 72a, 72b, 72c for expanding the refrigerant flowing into the indoor heat exchanger in a cooling mode to a predetermined state. The

  Next, the distributor 60 supplies the refrigerant flowing through the first connecting pipe 61 to the expansion devices of the indoor units when the entire indoor units 70a, 70b, 70c are operated in the cooling mode. When the entire indoor units 70a, 70b, and 70c are operated in the heating mode, the refrigerant flowing through the first connecting pipe 62 is supplied to the indoor units 70a, 72b, and 72c. The heat exchangers 71a, 71b, 71c are configured to be guided directly.

  For this purpose, the distributor 60 is branched from the first refrigerant pipe 61 by the number of the indoor units 70a, 70b, 70c and is connected to the expansion devices 72a, 72b, 72c of the indoor units. Refrigerant branch pipes 61a, 61b, 61c, second refrigerant branch pipes 62a, 62b, 62c branched from the second refrigerant pipe 62 and connected to the indoor heat exchangers 71a, 71b, 71c of the indoor units, An electronic opening / closing valve 64 provided at a predetermined position before the second refrigerant pipe 62 is branched into the second refrigerant branch pipes is installed. The third refrigerant pipe 63 is configured to be connected to the other end of the second refrigerant pipe 62.

  With the above configuration, when the entire indoor units 70a, 70b, and 70c are operated in the cooling mode, the electronic opening / closing valve 64 installed in the second refrigerant pipe 62 is closed, and the compressor 51 The refrigerant discharged from the passage passes through the first refrigerant pipe 61 and the first refrigerant branch pipes 61a, 61b, 61c connected to the indoor units 70a, 70b, 70c by the switch device 55. 72 a, 72 b, 72 c, expanded and then passed through the indoor heat exchangers 71 a, 71 b, 71 c, the second refrigerant branch pipes 62 a, 62 b, 62 c, and the third refrigerant pipe 63. And sucked into the compressor 51.

  When the entire indoor units 70a, 70b, and 70c are operated in the heating mode, the electronic opening / closing valve 64 installed in the second refrigerant pipe 62 is opened, and the refrigerant discharged from the compressor 51 However, each indoor heat exchanger 71a, through the second refrigerant pipe 62 and the second refrigerant branch pipes 62a, 62b, 62c connected to the indoor units 70a, 70b, 70c by the switch device 55. After the heat exchange by flowing into 71b, 71c, the compression passes through the expansion devices 72a, 72b, 72c, the first refrigerant branch pipes 61a, 61b, 61c, the first refrigerant pipe 61, etc. Inhaled by the machine 51.

  In addition, an air-conditioning selection type multi-air conditioner provided as another embodiment of the air conditioner according to the present invention is an excess installed in a first refrigerant pipe 21 that connects the outdoor heat exchanger 12 and the distributor 20. It further includes a cooling device 100.

  The supercooling device 100 is a device that supercools the refrigerant that has undergone the heat exchange process in the outdoor heat exchanger 52 under an isobaric condition, and guides the supercooled refrigerant to the distributor. A part of the refrigerant discharged from the outdoor heat exchanger 52 is expanded, and the expanded refrigerant and the remainder discharged from the outdoor heat exchanger 52 and flowing toward the distributor 60 along the first refrigerant pipe 61 are left. Then, the refrigerant is allowed to flow into a third refrigerant pipe 63 that connects the distributor 60 and the suction end of the compressor 51.

  The configuration of the supercooling device 100 that is commonly applied to the simultaneous heating / cooling type and selective multi-air conditioners will be described with reference to FIGS. 3 to 5. The exchanger 110, the expansion device 120, and each connecting pipe connected to the supercooling heat exchanger 110 are configured.

  More specifically, the supercooling device 100 includes a supercooling heat exchanger 110 that exchanges heat between the part of the expanded refrigerant and the remaining refrigerant that has not been expanded, and the outdoor heat exchanger 52. The expansion device 120 expands a part of the refrigerant that has undergone the heat exchange process, and is connected to the first refrigerant pipes 21 and 61 to guide the expanded refrigerant to the supercooling heat exchanger 110. The connection pipe 131, the second connection pipe 132 that guides the unexpanded refrigerant to the supercooling heat exchanger 110, and the expansion that has passed through the supercooling heat exchanger 110 and is supercooled by heat exchange. Heat exchange via the supercooling heat exchanger is performed on the third refrigerant pipe connected to the third connection pipe 133 that guides the refrigerant that has not been made to the distributors 20 and 60 and the suction end of the compressors 11 and 51. Done and said inflated Constructed and a fourth connecting pipe 134 for guiding the refrigerant.

  The supercooling heat exchanger 110 is formed with a flow path so that the refrigerant discharged from the outdoor heat exchangers 12 and 52 flows separately. For this purpose, the supercooling heat exchanger 110 has a first end connected to the second connecting pipe 132 and the other end connected to the third connecting pipe 133 so that the unexpanded high-temperature refrigerant flows. One flow pipe 111 is connected to the first connection pipe 131 at one end and to the fourth connection pipe 134 at the other end, and exchanges heat with the first flow pipe 111 so that the expanded low-temperature refrigerant is It is desirable to have a second flow pipe 112 that flows.

  Here, the supercooling heat exchanger 110 is formed of a double pipe structure including an internal flow pipe and an external flow pipe provided outside the internal flow pipe in order to improve the heat exchange efficiency of the refrigerant. It is desirable.

  In the present invention, it is preferable that the internal flow pipe is the second flow pipe 112 and the external flow pipe is the first flow pipe 111. This is because the expanded low-temperature refrigerant flows in the internal flow pipe 112 and the high-temperature refrigerant discharged from the outdoor heat exchangers 12 and 52 flows in the external flow pipe 111. This is because moisture is prevented from condensing on the surface of 110. Of course, the external flow pipe of the supercooling heat exchanger 110 may be connected to the first connection pipe 131, and the internal flow pipe may be connected to the second connection pipe 132. At this time, since the low-temperature refrigerant flows relatively to the external flow pipe 112, the humidity of the outdoor air may be condensed on the surface of the supercooling heat exchanger 110.

  The supercooling heat exchanger 110 can be changed to various forms as long as the two flow tubes 111 and 112 are in contact with each other. For example, the supercooling heat exchanger can be provided as a structure in which the first flow pipe is wound around the second flow pipe several times. The two flow pipes 111 and 112 are preferably formed of a material having high thermal conductivity.

  The fourth connecting pipe 134 is provided at a predetermined position of the third refrigerant pipes 23 and 63 connected to the inflow ends of the accumulators 14 and 54 in order to prevent the liquid refrigerant from flowing into the compressor. It is desirable to be connected to.

  Of course, the fourth connecting pipe 134 may be connected to a predetermined position of the third refrigerant pipe 23 between the compressors 11 and 51 and the accumulators 14 and 54. This is because such a refrigerant expands and is almost in a gaseous state, so that even if it flows into the compressors 11 and 51, the safety of the compressors 11 and 51 is not greatly impaired.

  Then, the first to fourth couplings are performed so that the high-temperature refrigerant flowing along the first flow pipe 111 flows in a direction opposite to the flow direction of the low-temperature expanded refrigerant flowing along the second flow pipe 112. It is desirable to connect the tubes 131, 132, 133, 134 to the supercooling heat exchanger 110. This is to increase the heat exchange efficiency by causing the refrigerant to flow in opposite directions. Of course, depending on the design conditions of the supercooling device 100, the high-temperature refrigerant flowing along the first flow pipe 111 flows in the same direction as the flow direction of the low-temperature expanded refrigerant flowing along the second flow pipe 112. As described above, the first to fourth connection pipes 131, 132, 133, and 134 may be connected to the supercooling heat exchanger 110.

It is desirable that the heat exchangers 113a and 113b that increase the heat exchange area be formed in the internal flow pipe of the supercooling heat exchanger having the double pipe structure configured as described above.
More specifically, each of the heat exchange portions 113a and 113b is formed to protrude inward from the inner wall of the internal flow pipe (in the present invention, the second flow pipe 112).

  This prevents an increase in flow resistance generated in the refrigerant flowing along the external flow pipe (the first flow pipe 111 in the present invention), and the refrigerant flowing along the second flow pipe 112. This is to improve the heat exchange area.

Of course, each of the heat exchanging parts 113a and 113b can be formed on all the inner and outer walls of the internal flow pipe, or can be formed on all the inner and outer walls of the internal flow pipe and the inner wall of the external flow pipe.
Each of the heat exchanging parts 113a and 113b is formed in a ring shape along the circumferential direction on the inner wall surface of the internal flow pipe, or as shown in FIG. It is formed in a spiral shape along the flow direction of the refrigerant. Moreover, as shown in FIG. 5, it can also be elongate along the flow direction of a refrigerant | coolant. Such a structure can reduce the flow resistance of the expanded refrigerant while increasing the heat exchange efficiency of the refrigerant.

The shape of each of the heat exchange units 113a and 113b is an exemplification as an embodiment, and it is obvious that the shape can be changed to various shapes.
The supercooling device 100 having the supercooling heat exchanger 110 configured as described above is preferably installed inside the outdoor units 10 and 50. More specifically, the lengths of the first refrigerant pipes 21 and 61 provided between the supercooling device 100 and the outdoor heat exchangers 12 and 52 are shortened, and the outdoor heat exchangers 12 and 61 are shortened. By exchanging heat from the refrigerant discharged from 52, a part of the refrigerant in the first refrigerant pipe 21 is prevented from expanding during the flow, and the supercooled liquid refrigerant is supplied to the distributor 20. The refrigerant pressure drop in the first refrigerant pipes 21 and 61 can be minimized.

  The supercooling heat exchanger 110 having the above configuration desirably has a length in the range of 1 to 2.5 m. This is because the refrigerant that has been expanded to a low temperature by the expansion device 120 installed in the first connecting pipe 131 and the refrigerant that has not been expanded flowing along the second connecting pipe have the subcooling heat exchanger 110. This is so that heat can be sufficiently exchanged in the interior of the interior.

  Since the operation of the supercooling device 100 provided in the heating / cooling simultaneous multi-type air conditioner and the cooling / heating selection-type multi-air conditioner according to the present invention configured as described above is almost the same, hereinafter, the cooling / heating simultaneous multi-type The case where the plurality of indoor units 30b and 30c of the air conditioner are operated in the cooling mode and the few indoor units 30a are operated in the heating mode will be described.

  First, when the simultaneous heating and cooling multi-air conditioner is operated, the refrigerant that is compressed and discharged to a high pressure state by the compressor 11 flows into the outdoor heat exchanger 12 by the switch device 15. At this time, the high-pressure refrigerant is condensed while exchanging heat with external air by the rotation of the outdoor fan 13 and then discharged to the first refrigerant pipe 21 connected to the supercooling device 100.

  Here, after a part of the refrigerant flowing into the supercooling device 100 along the first refrigerant pipe 21 is expanded into a low-temperature refrigerant by the expansion device 120 installed in the first connection pipe 131, The remainder of the refrigerant that flows along the second flow pipe 112 and flows into the supercooling device 100 along the first refrigerant pipe 21 flows into the first flow pipe 111 through the second connection pipe 132. As a result of mutual heat exchange, the refrigerant flowing along the first flow pipe 111 reaches supercooling in an isobaric state.

  Next, the refrigerant discharged from the first flow pipe 111 of the supercooling heat exchanger 110 is not expanded in the first refrigerant pipe 21 and is supplied to the distributor 20 via the third connection pipe 133. After flowing in, the air is guided to the corresponding indoor units 30b and 30c along the first refrigerant branch pipes 21b and 21c connected to the indoor unit operated in the cooling mode, and is subjected to an expansion process and a heat exchange process. After the room is cooled, it passes through the third refrigerant branch pipes 23b and 23c, the third refrigerant pipe 23, and the accumulator 14, and is sucked into the compressor 11.

  Then, the refrigerant discharged from the second flow pipe 112 of the supercooling heat exchanger 110 is guided by the fourth connecting pipe 134 and the third refrigerant pipe 23 and flows into the accumulator 14 to be a gaseous refrigerant. After being separated into a liquid refrigerant, it is sucked into the compressor 11.

On the other hand, a part of the refrigerant discharged from the compressor 11 directly enters the distributor 20 without passing through the outdoor heat exchanger 12, and is connected to the indoor unit 30a operated in the heating mode. The first refrigerant branch pipe 21a connected to the indoor unit operated in the heating mode after flowing into the corresponding indoor unit 30a through the second refrigerant branch pipe 22a and heating the room through the heat exchange process. The refrigerant flows along the first refrigerant pipe.
FIG. 6 is a Ph diagram showing the refrigeration cycle of the air conditioner according to the present invention.

It is the block diagram which showed 1st Embodiment of the air conditioner by this invention. It is the block diagram which showed other embodiment of the air conditioner by this invention. FIG. 3 is a configuration diagram illustrating an embodiment of a supercooling device provided in the air conditioner illustrated in FIGS. 1 and 2. FIG. 4 is a cross-sectional perspective view of a supercooling heat exchanger provided in the supercooling device illustrated in FIG. 3. FIG. 4 is a cross-sectional perspective view of another supercooling heat exchanger provided in the supercooling device illustrated in FIG. 3. 1 is a Ph diagram showing a refrigeration cycle of a multi-air conditioner according to the present invention.

Explanation of symbols

10, 50 Outdoor unit 11, 51 Compressor 12, 52 Outdoor heat exchanger 13, 53 Outdoor fan 14, 54 Accumulator 15, 55 Switch device 20, 60 Distributor 21, 61 First refrigerant tube 22, 62 Second refrigerant tube 23, 63 Third refrigerant pipes 30a, 30b, 30c indoor units 31a, 31b, 31c indoor heat exchangers 32a, 32b, 32c expansion devices

Claims (20)

An outdoor unit installed outside and having a compressor and an outdoor heat exchanger in its interior;
An indoor unit installed indoors and having an indoor heat exchanger inside;
A distributor that guides the refrigerant flowing from the outdoor unit into the indoor unit according to operating conditions, and again guides the refrigerant that has passed through the indoor unit to the outdoor unit;
A supercooling device that supercools the refrigerant that has undergone the heat exchange process in the outdoor heat exchanger under an isobaric condition and guides the supercooled refrigerant to the distributor. A featured air conditioner. The supercooling device is:
2. A part of the refrigerant that has undergone a heat exchange process is expanded in the outdoor heat exchanger, and the part of the expanded refrigerant and the remaining refrigerant that has not been expanded are mutually heat-exchanged. Air conditioner. The supercooling device is:
A supercooling heat exchanger for exchanging heat between the expanded part of the refrigerant and the remaining unexpanded refrigerant;
A first connecting pipe having an expansion device for expanding a part of the refrigerant that has undergone a heat exchange process in the outdoor heat exchanger, and guiding the expanded refrigerant to the supercooling heat exchanger;
A second connecting pipe for guiding the unexpanded refrigerant to the supercooling heat exchanger;
A third connecting pipe for guiding the unexpanded refrigerant that has passed through the supercooling heat exchanger to the distributor;
The refrigerant pipe connected to the suction end of the compressor has a fourth connecting pipe for guiding the expanded refrigerant that has passed through the supercooling heat exchanger. Air conditioner. The supercooling heat exchanger is
A first flow pipe having one end connected to the second connection pipe and the other end connected to the third connection pipe through which the unexpanded refrigerant flows;
One end is connected to the first connecting pipe, and the other end is connected to the fourth connecting pipe to exchange heat with the first flow pipe, and has a second flow pipe through which the expanded refrigerant flows. The air conditioner according to claim 3, wherein the air conditioner is used. The supercooling heat exchanger is
5. The air conditioner according to claim 4, wherein the air conditioner has a double tube structure. The second flow pipe is
The air conditioner according to claim 5, wherein the air conditioner is provided in the first flow pipe in a longitudinal direction.   The air conditioner according to claim 6, wherein the refrigerant flowing along the second flow pipe flows in a direction opposite to a flow direction of the refrigerant flowing along the first flow pipe.   The air conditioner according to claim 6, wherein the refrigerant flowing along the second flow pipe flows in the same direction as the flow direction of the refrigerant flowing along the first flow pipe. The first flow pipe is
The air conditioner according to claim 5, wherein the air conditioner is provided in the longitudinal direction inside the second flow pipe. The supercooling heat exchanger is
6. The air conditioner according to claim 5, wherein the air conditioner has a length of 1 m to 2.5 m. The supercooling heat exchanger is
The air conditioner according to claim 5, further comprising a heat exchange part formed on a wall of the internal flow pipe to increase a heat exchange area. The heat exchange part is
The air conditioner according to claim 11, wherein the air conditioner is protruded inward from an inner wall of the internal flow pipe. The heat exchange part is
The air conditioner according to claim 12, wherein the air conditioner is provided on an inner wall surface of the internal flow pipe in a circumferential direction. The heat exchange part is
The air conditioner according to claim 12, wherein the air conditioner is provided on an inner wall surface of the internal flow pipe along a flow direction of the refrigerant. The heat exchange part is
The air conditioner according to claim 12, wherein the air conditioner is spirally provided on an inner wall surface of the internal flow pipe. The expansion device is
4. An air conditioner according to claim 3, comprising an electronic expansion valve.   4. The air according to claim 3, further comprising an accumulator that is provided in a refrigerant pipe connected to the suction end of the compressor and separates a gaseous refrigerant and a liquid refrigerant. Harmony machine. The fourth connecting pipe is
The air conditioner according to claim 17, wherein the air conditioner is connected to a refrigerant pipe connected to a refrigerant inflow end of the accumulator. The supercooling device is:
The air conditioner according to claim 1, wherein the air conditioner is provided at a predetermined position in the outdoor unit. The outdoor unit is
The switch device according to claim 1, further comprising a switch device that selectively switches a flow direction of the refrigerant discharged from the compressor to the outdoor heat exchanger or the distributor according to the operation condition. Air conditioner.

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