JP2730638B2 - Multi-room air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a multi-chamber air conditioner configured to separate a refrigerant cycle into a heat source side refrigerant cycle and a user side refrigerant cycle and to perform heat exchange with an auxiliary heat exchanger. It concerns the device.

2. Description of the Related Art Conventional multi-room air conditioners of this type are disclosed in
There is one disclosed in Japanese Patent Publication No. 238954.

Hereinafter, the conventional multi-room air conditioner will be described with reference to FIG.

In FIG. 2, 11 is a heat source side compressor, 12 is a heat source side four-way valve, 13 is a heat source side heat exchanger, 14 is a cooling decompression device, 15 is a heating decompression device, and 16 is a cooling decompression device 14 during heating. Is a check valve for closing the heating decompression device 15 during cooling, and 18 is a first auxiliary heat exchanger. Then, the heat source side compressor 11, the heat source side four-way valve 12, the heat source side heat exchanger 13, the cooling decompression device 14, the heating decompression device 15, the check valves 16, 17 and the first
The auxiliary heat exchanger 18 is connected in a ring shape to form a heat source side refrigerant cycle.

Reference numeral 19 denotes a second auxiliary heat exchanger, which is formed integrally with the first auxiliary heat exchanger 18 so as to exchange heat. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of the refrigerant at the time of refrigerant and at the time of heating. Reference numeral 21 denotes a refrigerant transport device having a reversible characteristic in which the refrigerant flows in opposite directions during cooling and heating. The second auxiliary heat exchanger 19, the refrigerant amount adjusting tank 20, and the refrigerant transport device 21 are housed in the outdoor unit f together with the components of the heat source side refrigerant cycle.

22a and 22b are use side heat exchangers housed in the indoor units g and h, and connected to the outdoor unit f by connection pipes i, i ', j and j'. Then, the second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 20, the refrigerant transfer position 21, the use side heat exchangers 22a and 22b, and the connection pipes i, i ', j, j' are connected in a ring shape, and the use side refrigerant is connected. Form a cycle.

The operation of the multi-room air-conditioning apparatus configured as described above will be described.

In the cooling operation, the refrigerant cycle is indicated by a solid arrow in the drawing.In the heat source-side refrigerant cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the heat source-side compressor 11 passes through the heat source-side four-way valve 12 and passes through the heat source-side heat exchanger. Heat is released at 13 and condensed and liquefied.
The pressure is reduced by the cooling decompression device 14 through the cooling device 16, the heat is absorbed in the first auxiliary heat exchanger 18 by heat exchange with the second auxiliary heat exchanger 19 to evaporate, and the second auxiliary heat exchanger 19 is cooled. Thereafter, the flow returns to the heat source side compressor 11 through the heat source side four-way valve 12.

At this time, in the use side refrigerant cycle, the first auxiliary heat exchanger
The gaseous refrigerant in the second auxiliary heat exchanger 19 is cooled and condensed and liquefied by heat exchange with the refrigerant 18, and then the refrigerant amount adjusting tank
The refrigerant flows into the refrigerant transport device 21 through 20. The liquid refrigerant flowing out of the refrigerant transfer device 21 passes through the connection pipes i and j, absorbs heat in the use side heat exchangers 22a and 22b to evaporate, cools the room, and then connects the connection pipes i ′ and j. ′ To the second auxiliary heat exchanger 19.

On the other hand, during the heating operation, the refrigerant cycle indicated by a broken line arrow in the drawing is performed, and in the heat source side refrigerant cycle, the heat source side compressor is operated.
The high-temperature and high-pressure gaseous refrigerant discharged from 11 passes through the heat source side four-way valve 12 and releases heat in the first auxiliary heat exchanger 18 by heat exchange with the second auxiliary heat exchanger 19 to condense and liquefy. (2) The auxiliary heat exchanger 19 is heated, and then depressurized by the heating depressurizing device 15 through the check valve 17, absorbs heat in the heat source side heat exchanger 13 to evaporate gas, and then switches the heat source side four-way valve 12 It returns to the heat source side compressor 11 through.

At this time, in the use side refrigerant cycle, the first auxiliary heat exchanger
The liquid refrigerant in the second auxiliary heat exchanger 19 is heated by the heat exchange with the evaporator 18 and evaporates into gas. The heat is radiated by the use-side heat exchangers 22a and 22b through the connecting pipes i 'and j' to condense and liquefy. To heat the room, and then, through the connection pipes i and j, the refrigerant transfer device 21
Flows into. The liquid refrigerant flowing out of the refrigerant conveying device 21 passes through a refrigerant amount adjusting tank 20 and passes through a second auxiliary heat exchanger 19.
Flows to

However, in the above configuration, the indoor units g and h can only perform the same operation as the operation of the outdoor unit f. For example, when the outdoor unit f is a cooling refrigerant cycle, the indoor units g and h can only perform cooling.

Therefore, due to the indoor load such as the intermediate period, when there is a mixture of the room that needs to perform the cooling operation and the room that needs to perform the heating operation, it is not possible to perform both operations at the same time, so another cooling and heating device will be installed. There was a problem that the device became complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a multi-room air-conditioning apparatus having a simple configuration in which one outdoor unit is used and each indoor unit can freely select a cooling operation or a heating operation.

Means for Solving the Problems In order to solve the above problems, a multi-room air-conditioning apparatus according to the present invention includes a third auxiliary heat exchanger provided in parallel with a use side heat exchanger and integrated with the third auxiliary heat exchanger. A fourth auxiliary heat exchanger, an auxiliary four-way valve, an auxiliary compressor, an auxiliary indoor heat exchanger, an auxiliary indoor side decompression device, and an auxiliary heat source side decompression device for forming and exchanging heat are provided. ,
The main indoor unit includes the use side heat exchanger, and the auxiliary heat source side unit includes the third auxiliary heat exchanger, the fourth auxiliary heat exchanger, the auxiliary four-way valve, the auxiliary compressor, and the auxiliary heat source side decompression device. The auxiliary indoor unit is provided with the auxiliary indoor heat exchanger and the auxiliary indoor side decompression device.

Operation In the multi-room air conditioner of the present invention having the above-described configuration, if both the outdoor unit and the auxiliary heat source side unit are operated in the cooling refrigerant cycle, cooling is performed in both the main indoor unit and the auxiliary indoor unit. In this case, since the cooling capacity obtained by heat exchange between the third auxiliary heat exchanger and the fourth auxiliary heat exchanger is added to the cooling capacity of the auxiliary heat source side unit, the cooling capacity of the auxiliary indoor unit can be increased.

Further, if both the outdoor unit and the auxiliary heat source side unit are operated in the heating refrigerant cycle, heating is performed in both the main indoor unit and the auxiliary indoor unit. In this case, since the heating capacity obtained by heat exchange between the third auxiliary heat exchanger and the fourth auxiliary heat exchanger is added to the heating capacity of the auxiliary heat source side unit, the heating capacity of the auxiliary indoor unit can be increased.

Also, if the outdoor unit is operated in a cooling refrigerant cycle and the auxiliary heat source side unit is operated in a heating refrigerant cycle,
Cooling is performed in the main indoor unit, and heating is performed in the auxiliary indoor unit. In this case, the refrigerant in the use-side refrigerant cycle is cooled in two places, the second auxiliary heat exchanger and the third auxiliary heat exchanger, and absorbs heat in the use-side heat exchanger, thereby increasing the cooling capacity of the main indoor unit. be able to.

Also, if the outdoor unit is operated in a heating refrigerant cycle and the auxiliary heat source side unit is operated in a cooling refrigerant cycle,
Heating is performed in the main indoor unit, and cooling is performed in the auxiliary indoor unit. In this case, the refrigerant in the use-side refrigerant cycle is heated in two places, the second auxiliary heat exchanger and the third auxiliary heat exchanger, and radiates heat in the use-side heat exchanger, thereby increasing the heating capacity of the main indoor unit. be able to.

The fourth auxiliary heat exchanger of the auxiliary heat source side unit is the third auxiliary heat exchanger.
Since heat exchange is performed with the auxiliary heat exchanger, the auxiliary heat source side unit does not need to be installed at a location where outside air flows, and there is no need to provide a blower that blows air to the fourth auxiliary heat exchanger. No equipment for water treatment or defrosting treatment is required.

Therefore, with a simple configuration, one outdoor unit,
Between the main indoor unit and the auxiliary indoor unit, both cooling operation, both heating operation, the main indoor unit is cooling, the auxiliary indoor unit is heating, the main indoor unit is heating, and the auxiliary indoor unit is cooling can be freely selected. Become.

Example Hereinafter, a multi-room air conditioner of one embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle of a multi-room cooling / heating apparatus according to one embodiment of the present invention.

In the figure, 11 is a heat source side compressor, 12 is a heat source side four-way valve,
13 is a heat source side heat exchanger, 14 is a cooling decompression device, 15 is a heating decompression device, 16 is a check valve that closes the cooling decompression device 14 during heating, and 17 is a heating decompression device 15 during cooling. The resulting check valve 18 is a first auxiliary heat exchanger. In the present embodiment, the heat source side pressure reducing device is constituted by the cooling pressure reducing device 14, the heating pressure reducing device 15, and the check valves 16 and 17. And the heat source side compressor 1
1, the heat source side four-way valve 12, the heat source side heat exchanger 13, the cooling decompression device 14, the heating decompression device 15, the check valves 16, 17 and the first auxiliary heat exchanger 18 are connected in a ring, and the heat source side refrigerant Form a cycle.

Reference numeral 19 denotes a second auxiliary heat exchanger, which is formed integrally with the first auxiliary heat exchanger 18 so as to exchange heat. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigerant during cooling and during heating. Reference numeral 21 denotes a refrigerant transport device having a reversible characteristic in which the refrigerant flows in opposite directions during cooling and heating. Then, the second auxiliary heat exchanger 19, the refrigerant amount adjusting tank 20 and the refrigerant transport device 21 are housed in the outdoor unit f together with the components of the heat source side refrigerant cycle.

A use-side heat exchanger 23 is housed in the main indoor unit 24 and is connected to the outdoor unit f by main connection pipes 25a and 25b.

26 is a third auxiliary heat exchanger provided in parallel with the use side heat exchanger 23, 27 is a fourth auxiliary heat exchanger formed integrally with the third auxiliary heat exchanger 26 and exchanging heat, 28 is auxiliary compression , 29 is an auxiliary four-way valve, 30 is an auxiliary heat source side pressure reducing device, and 31 is an auxiliary heat source side check valve provided in a passage bypassing the auxiliary heat source side pressure reducing device 30. The third auxiliary heat exchanger 26, the fourth auxiliary heat exchanger 27, the auxiliary compressor 28, the auxiliary four-way valve 29, the auxiliary heat source side pressure reducing device 30, and the auxiliary heat source side check valve 31
32, and the third auxiliary heat exchanger 26 is connected to the first auxiliary connection pipe.
It communicates with the main connection pipes 25a and 25b via 33a and 33b.

34 is an auxiliary indoor side heat exchanger, 35 is an auxiliary indoor side decompression device,
Reference numeral 36 denotes an auxiliary indoor side check valve provided in a passage that bypasses the auxiliary indoor side pressure reducing device 35. The auxiliary indoor heat exchanger 34, the auxiliary indoor pressure reducing device 35, and the auxiliary indoor check valve 36
Is stored in the auxiliary indoor unit 37 and the second auxiliary connection pipe 38
a, 38b connected to the auxiliary heat source side unit.

Then, the second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 20,
Refrigerant conveying device 21, use side heat exchanger 23, third auxiliary heat exchanger 26
The main connection pipes 25a, 25b and the first auxiliary connection pipes 33a, 33b are connected in a ring to form a use-side refrigerant cycle, and the fourth auxiliary heat exchanger 27, the auxiliary compressor 28, the auxiliary four-way valve 29, the auxiliary heat source side The depressurizing device 30, the auxiliary heat source side check valve 31, the auxiliary indoor side heat exchanger 34, the auxiliary indoor depressurizing device 35, the auxiliary indoor side check valve 36, and the second auxiliary connecting pipes 38a, 38b are connected in an annular manner to form an auxiliary refrigerant. Form a cycle.

The operation of the multi-room air-conditioning apparatus configured as described above will be described.

First, a case will be described in which both the operation of the outdoor unit f and the operation of the auxiliary heat source side unit 32 are a cooling refrigerant cycle.

During the cooling operation of the outdoor unit f, the refrigerant cycle is indicated by a solid arrow in the drawing, and in the heat source side refrigerant cycle, the heat source side compressor is used.
The high-temperature and high-pressure gaseous refrigerant discharged from 11 passes through the heat source side four-way valve 12, radiates heat in the heat source side heat exchanger 13 and condenses and liquefies, and then passes through the check valve 16 and the cooling pressure reducing device 14. At the first auxiliary heat exchanger 18 and the second auxiliary heat exchanger 19
The second auxiliary heat exchanger 19 is cooled by absorbing heat by exchanging heat with the heat, and then returns to the heat source side compressor 11 through the heat source side four-way valve 12.

On the other hand, in the auxiliary refrigerant cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the auxiliary compressor 28 passes through the auxiliary four-way valve 29 and exchanges heat with the third auxiliary heat exchanger 26 at the fourth auxiliary heat exchanger 27. The heat is condensed and liquefied, and the third auxiliary heat exchanger 26 is heated. Thereafter, the pressure is reduced by the auxiliary indoor side pressure reducing device 35 through the auxiliary heat source side check valve 31, through the second auxiliary connection pipe 38a, The heat is absorbed by the auxiliary indoor heat exchanger 34 to evaporate and evaporate, and the interior of the room where the auxiliary indoor unit 37 is installed is cooled, and then the auxiliary compressor 28 through the auxiliary four-way valve 29 through the second auxiliary connection pipe 38b. Return to

At this time, in the use side refrigerant cycle, the first auxiliary heat exchanger
The gaseous refrigerant in the second auxiliary heat exchanger 19 is cooled and condensed and liquefied by heat exchange with the refrigerant 18, and then the refrigerant amount adjusting tank
The refrigerant flows into the refrigerant transport device 21 through 20. A part of the liquid refrigerant flowing out of the refrigerant transfer device 21 passes through the main connection pipe 25b, absorbs part of the heat in the use side heat exchanger 23, evaporates and gasifies, and cools the room in which the main indoor unit 24 is installed, The remaining liquid refrigerant passes through the first auxiliary connection pipe 33b and passes through the third auxiliary heat exchanger 26.
In the above, the refrigerant is heated by the heat exchange with the fourth auxiliary heat exchanger 27 to evaporate and evaporate, passes through the first auxiliary connection pipe 33a, and passes through the main connection pipe 25a with the refrigerant having passed through the use side heat exchanger 23 and the third auxiliary heat. The refrigerant that has passed through the exchanger 26 joins the second auxiliary heat exchanger
Flows to 19.

In this case, since the cooling capacity obtained by heat exchange between the third auxiliary heat exchanger 26 and the fourth auxiliary heat exchanger 27 is added to the cooling capacity of the auxiliary heat source side unit 32, the cooling capacity of the auxiliary indoor unit 37 is increased. be able to.

Next, a case will be described in which both the operation of the outdoor unit f and the auxiliary heat source side unit 32 are a refrigerant cycle for heating.

During the heating operation of the outdoor unit f, the refrigerant cycle is indicated by a broken line arrow in the figure, and in the heat source side refrigerant cycle, the heat source side compressor is used.
The high-temperature and high-pressure gaseous refrigerant discharged from 11 passes through the heat source side four-way valve 12 and releases heat in the first auxiliary heat exchanger 18 by heat exchange with the second auxiliary heat exchanger 19 to condense and liquefy. (2) The auxiliary heat exchanger 19 is heated, and then depressurized by the heating depressurizing device 15 through the check valve 17, absorbs heat in the heat source side heat exchanger 13 to evaporate gas, and then switches the heat source side four-way valve 12 It returns to the heat source side compressor 11 through.

On the other hand, in the auxiliary refrigerant cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the auxiliary compressor 28 passes through the auxiliary four-way valve 29, the second auxiliary connection pipe 38b, and the auxiliary indoor heat exchanger 34.
And heats the room in which the auxiliary indoor unit 37 is installed, then passes through the auxiliary indoor side check valve 36, passes through the second auxiliary connection pipe 38a, and is depressurized by the auxiliary heat source side pressure reducing device 30 Then, the fourth auxiliary heat exchanger 27 absorbs heat by heat exchange with the third auxiliary heat exchanger 26 to evaporate and gasify, cools the third auxiliary heat exchanger 26, and then passes through the auxiliary four-way valve 29 to assist. Return to the compressor 28.

At this time, in the use side refrigerant cycle, the first auxiliary heat exchanger
The liquid refrigerant in the second auxiliary heat exchanger 19 is heated by the heat exchange with 18, and evaporates and gasified, and a part of the liquid refrigerant passes through the main connection pipe 25a and radiates heat in the use side heat exchanger 23 to be condensed and liquefied. The room in which the main indoor unit 24 is installed is heated, and the remaining gas refrigerant is cooled by heat exchange with the fourth auxiliary heat exchanger 27 in the third auxiliary heat exchanger 26 through the first auxiliary connection pipe 33a. Condensed and liquefied, passed through the first auxiliary connection pipe 33b,
The refrigerant and the third auxiliary heat exchanger pass through the use side heat exchanger 23 at 5b.
The refrigerant having passed through 26 merges and flows into the refrigerant transport device 21. The liquid refrigerant flowing out of the refrigerant conveying device 21 flows to the second auxiliary heat exchanger 19 through the refrigerant amount adjusting tank 20.

In this case, since the heating capacity obtained by heat exchange between the third auxiliary heat exchanger 26 and the fourth auxiliary heat exchanger 27 is added to the heating capacity of the auxiliary heat source side unit 32, the heating capacity of the auxiliary indoor unit 37 is increased. be able to.

Next, a case in which the outdoor unit f is operated in a cooling refrigerant cycle and the auxiliary heat source side unit 32 is operated in a heating refrigerant cycle will be described.

In the heat-source-side refrigerant cycle, the high-temperature, high-pressure gaseous refrigerant discharged from the heat-source-side compressor 11 passes through the heat-source-side four-way valve 12, radiates heat in the heat-source-side heat exchanger 13, and condenses and liquefies. The pressure is reduced by the cooling decompression device 14 through the valve 16, and the first auxiliary heat exchanger 18 absorbs heat by heat exchange with the second auxiliary heat exchanger 19 to evaporate and gasify, thereby cooling the second auxiliary heat exchanger 19. Thereafter, the flow returns to the heat source side compressor 11 through the heat source side four-way valve 12.

On the other hand, in the auxiliary refrigerant cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the auxiliary compressor 28 passes through the auxiliary four-way valve 29, the second auxiliary connection pipe 38b, and the auxiliary indoor heat exchanger 34.
And heats the room in which the auxiliary indoor unit 37 is installed, then passes through the auxiliary indoor side check valve 36, passes through the second auxiliary connection pipe 38a, and is depressurized by the auxiliary heat source side pressure reducing device 30 Then, the fourth auxiliary heat exchanger 27 absorbs heat by heat exchange with the third auxiliary heat exchanger 26 to evaporate and gasify, cools the third auxiliary heat exchanger 26, and then passes through the auxiliary four-way valve 29 to assist. Return to the compressor 28.

At this time, in the use side refrigerant cycle, the first auxiliary heat exchanger
The gaseous refrigerant in the second auxiliary heat exchanger 19 is cooled and condensed and liquefied by heat exchange with the refrigerant 18, and then the refrigerant amount adjusting tank
The refrigerant flows into the refrigerant transport device 21 through 20. A part of the liquid refrigerant flowing out of the refrigerant transfer device 21 passes through the main connection pipe 25b, absorbs part of the heat in the use side heat exchanger 23, evaporates and gasifies, and cools the room in which the main indoor unit 24 is installed, The remaining liquid refrigerant passes through the first auxiliary connection pipe 33b and passes through the third auxiliary heat exchanger 26.
In the above, the refrigerant cooled by the heat exchange with the fourth auxiliary heat exchanger 27 passes through the first auxiliary connection pipe 33a, passes through the use side heat exchanger 23 at the main connection pipe 25a, and is cooled by the third auxiliary heat exchanger 23. The liquid refrigerant cooled through the heat exchanger 26 joins and flows to the second auxiliary heat exchanger 19.

In this case, the refrigerant in the use-side refrigerant cycle is cooled in two places, the second auxiliary heat exchanger 19 and the third auxiliary heat exchanger 26, and absorbs heat in the use-side heat exchanger 23. The ability can be increased.

Next, a case will be described in which the outdoor unit f is operated in the refrigerant cycle for heating and the auxiliary heat source side unit 32 is operated in the refrigerant cycle for cooling.

In the heat-source-side refrigerant cycle, the high-temperature, high-pressure gaseous refrigerant discharged from the heat-source-side compressor 11 passes through the heat-source-side four-way valve 12, and heats up with the second auxiliary heat exchanger 19 in the first auxiliary heat exchanger 18. The heat is exchanged to condense and liquefy, and the second auxiliary heat exchanger 19
Is heated and then passed through a check valve 17 to provide a heating decompression device 15.
Then, the heat is absorbed by the heat source side heat exchanger 13 to evaporate and gasify, and then returns to the heat source side compressor 11 through the heat source side four-way valve 12.

On the other hand, in the auxiliary refrigerant cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the auxiliary compressor 28 passes through the auxiliary four-way valve 29 and exchanges heat with the third auxiliary heat exchanger 26 at the fourth auxiliary heat exchanger 27. The heat is condensed and liquefied, and the third auxiliary heat exchanger 26 is heated. Thereafter, the pressure is reduced by the auxiliary indoor side pressure reducing device 35 through the auxiliary heat source side check valve 31, through the second auxiliary connection pipe 38a, The heat is absorbed by the auxiliary indoor heat exchanger 34 to evaporate and evaporate, and the interior of the room where the auxiliary indoor unit 37 is installed is cooled, and then the auxiliary compressor 28 through the auxiliary four-way valve 29 through the second auxiliary connection pipe 38b. Return to

At this time, in the use side refrigerant cycle, the first auxiliary heat exchanger
The liquid refrigerant in the second auxiliary heat exchanger 19 is heated by the heat exchange with 18, and evaporates and gasified, and a part of the liquid refrigerant passes through the main connection pipe 25a and is radiated and condensed and liquefied in the use side heat exchanger 23, The room in which the main indoor unit 24 is installed is heated, and the remaining gas refrigerant is heated by heat exchange with the fourth auxiliary heat exchanger 27 in the third auxiliary heat exchanger 26 through the first auxiliary connection pipe 33a. ,
The refrigerant liquefied through the use side heat exchanger 23 at the main connection pipe 25b and the third auxiliary heat exchanger through the first auxiliary connection pipe 33b
The refrigerant heated through 26 merges with the refrigerant, and the refrigerant transport device 21
Flows into. The refrigerant flowing out of the refrigerant transport device 21 is
It flows to the second auxiliary heat exchanger 19 through the refrigerant amount adjustment tank 20.

In this case, the refrigerant in the use-side refrigerant cycle is heated in two places, the second auxiliary heat exchanger 19 and the third auxiliary heat exchanger 26, and radiates heat in the use-side heat exchanger 23. The ability can be increased.

As described above, in the present embodiment, the third auxiliary heat exchanger 26 is provided in parallel with the use-side heat exchanger 23, and the fourth auxiliary heat exchange is formed integrally with the third auxiliary heat exchanger 26 to perform heat exchange. vessel
27, an auxiliary four-way valve 29, an auxiliary compressor 28, an auxiliary indoor heat exchanger 34, an auxiliary indoor side pressure reducing device 35 and an auxiliary heat source side pressure reducing device 30 are provided with an auxiliary refrigerant cycle which is connected in an annular manner, and the main indoor unit 24 Equipped with a use side heat exchanger 23 and an auxiliary heat source side unit 32
Further comprising a third auxiliary heat exchanger 26, a fourth auxiliary heat exchanger 27, an auxiliary four-way valve 29, an auxiliary compressor 28, and an auxiliary heat source side pressure reducing device 30,
Since the auxiliary indoor unit 37 is provided with the auxiliary indoor heat exchanger 34 and the auxiliary indoor side decompression device 35, whether the outdoor unit f is a cooling refrigerant cycle (the main indoor unit 24 is cooling) or a heating refrigerant cycle (the main indoor unit 24). Regardless of whether the unit 24 is heating, if the auxiliary heat source side unit 32 (auxiliary refrigerant cycle) is operated in a cooling refrigerant cycle, the auxiliary indoor unit 37 can perform cooling, and the auxiliary heat source side unit 32 (auxiliary refrigerant cycle ) Is operated in the heating refrigerant cycle, the heating can be performed by the auxiliary indoor unit 37.

In addition, since the fourth auxiliary heat exchanger 27 of the auxiliary heat source side unit 32 exchanges heat with the third auxiliary heat exchanger 26, it is not necessary to install the auxiliary heat source side unit 32 in a location (outdoor) where outside air flows, It is not necessary to provide a blower for blowing air to the fourth auxiliary heat exchanger 27, and a device for treating condensed water and defrosting by exchanging heat with the outside air is unnecessary. The configuration is simpler than in the case of forming a refrigerant cycle in which the refrigerant cycle is performed.

Therefore, with a simple configuration, one outdoor unit f is provided, and the main indoor unit 24 and the auxiliary indoor unit 37 are
Both cooling operation, both heating operation, the main indoor unit 24 is cooled, the auxiliary indoor unit 37 is heated, the main indoor unit 24 is heated, and the auxiliary indoor unit 37 is cooled can be freely selected. This is effective in a case where a room in which cooling operation is required and a room in which heating operation is required coexist.

Heat is exchanged between the use-side refrigerant cycle and the auxiliary refrigerant cycle, and the cooling / heating capacity can be changed by switching the cooling / heating of the other cycle.

In addition, by providing the components of the auxiliary refrigerant cycle in two units, the auxiliary heat source side unit 32 and the auxiliary indoor unit 37, when the distance between the main indoor unit 24 and the auxiliary indoor unit 37 is large, It is possible to adjust the length of the second auxiliary connection pipes 38a, 38b without increasing the length of the first auxiliary connection pipes 33a, 33b of the use side refrigerant cycle. Does not need to be large, and the capacity of the refrigerant amount adjustment tank 20 can be reduced.

Further, by providing the auxiliary indoor unit 37 with the auxiliary indoor heat exchanger 34 and the auxiliary indoor side pressure reducing device 35,
A general-purpose indoor unit can be used, and a plurality of auxiliary indoor units 37 can be connected in parallel.

Also, the auxiliary heat source side unit 32 and the auxiliary indoor side unit 37
The restrictions on the installation conditions are alleviated by the separation, and the restrictions on the installation conditions are also alleviated by the fact that the size can be reduced as compared to before the separation.

In this embodiment, one main indoor unit and one auxiliary indoor unit are used. However, it goes without saying that any number of units may be used.

Effect of the Invention As described above, the multi-room air conditioner of the present invention is formed by connecting a heat source side compressor, a heat source side four-way valve, a heat source side heat exchanger, a heat source side pressure reducing device, and a first auxiliary heat exchanger in a ring shape. A heat-source-side refrigerant cycle, a use-side refrigerant cycle formed by integrally connecting the second auxiliary heat exchanger, the refrigerant transfer device, and the use-side heat exchanger that are formed integrally with the first auxiliary heat exchanger and exchange heat, A third auxiliary heat exchanger provided in parallel with the use-side heat exchanger;
A fourth auxiliary heat exchanger, an auxiliary four-way valve, an auxiliary compressor, an auxiliary indoor heat exchanger, an auxiliary indoor side decompression device, and an auxiliary heat source side decompression device, which are formed integrally with the third auxiliary heat exchanger and exchange heat, are annularly formed. An auxiliary refrigerant cycle that is connected, an outdoor unit including the heat source-side refrigerant cycle, the second auxiliary heat exchanger, and the refrigerant transfer device; a main indoor unit including the use-side heat exchanger; An auxiliary heat source side unit including a third auxiliary heat exchanger, the fourth auxiliary heat exchanger, the auxiliary four-way valve, the auxiliary compressor, and the auxiliary heat source side pressure reducing device; the auxiliary indoor heat exchanger; By having the auxiliary indoor unit provided with the indoor decompression device, whether the outdoor unit is a cooling refrigerant cycle (main indoor unit is cooling) or a heating refrigerant cycle (main indoor unit is heating), heat If the side unit (auxiliary refrigerant cycle) is operated in the cooling refrigerant cycle, cooling can be performed in the auxiliary indoor unit. If the auxiliary heat source side unit (auxiliary refrigerant cycle) is operated in the heating refrigerant cycle, the auxiliary indoor unit can be used. Can perform heating.

The fourth auxiliary heat exchanger of the auxiliary heat source side unit is the third auxiliary heat exchanger.
In order to exchange heat with the auxiliary heat exchanger, there is no need to install the auxiliary heat source side unit in a place where the outside air flows (outdoor), and it is not necessary to provide a blower that blows air to the fourth auxiliary heat exchanger.
Since a device for treating condensed water and defrosting by heat exchange with the outside air is not required, the configuration is simpler than when an outdoor unit is newly added and an independent refrigerant cycle is formed.

Therefore, with a simple configuration, one outdoor unit,
Both cooling operation and heating operation are performed between the main indoor unit and the auxiliary indoor unit. It is possible to freely select the main indoor unit for cooling and the auxiliary indoor unit for heating, the main indoor unit for heating and the auxiliary indoor unit for cooling. This is effective when there are rooms that need to be operated.

Heat is exchanged between the use-side refrigerant cycle and the auxiliary refrigerant cycle, and the cooling / heating capacity can be changed by switching the cooling / heating of the other cycle.

Also, by providing the components of the auxiliary refrigerant cycle separately in two units, the auxiliary heat source side unit and the auxiliary indoor side unit, when the distance between the main indoor unit and the auxiliary indoor unit is large, the auxiliary heat source side unit It can be adjusted by the length of the connection pipe connecting the unit and the auxiliary indoor unit.In this case, it is not necessary to increase the transfer capacity of the refrigerant transfer device. The capacity of the refrigerant amount adjusting tank for adjusting the amount of refrigerant can be reduced.

In addition, since the auxiliary indoor unit includes the auxiliary indoor heat exchanger and the auxiliary indoor side decompression device, a general-purpose indoor unit can be used, and a plurality of auxiliary indoor units can be connected in parallel. It is.

In addition, the separation of the auxiliary heat source side unit and the auxiliary indoor side unit eases the restrictions on each installation condition, and the separation of the units makes it possible to reduce the size compared to before the separation. Is alleviated.

[Brief description of the drawings]

FIG. 1 is a refrigerant cycle diagram of a multi-room air conditioner in one embodiment of the present invention, and FIG. 2 is a refrigerant cycle diagram of a conventional multi-room air conditioner. 11: Heat source side compressor, 12: Heat source side four-way valve, 13: Heat source side heat exchanger, 14: Cooling decompression device, 15: Heating decompression device, 18: First auxiliary heat exchanger , 19 ... second auxiliary heat exchanger, 21 ... refrigerant transfer device, 23 ... use side heat exchanger, 24 ...
… Main indoor unit, 26… 3rd auxiliary heat exchanger, 27… 4th auxiliary heat exchanger, 28 …… Auxiliary compressor, 29 …… Auxiliary four-way valve, 30 …… Auxiliary heat source side pressure reducing device, 32… ... Auxiliary heat source side unit, 34 ... Auxiliary indoor side heat exchanger, 35 ... Auxiliary indoor side decompression device, 37 ... Auxiliary indoor unit, f ... Outdoor unit.

Claims (1)

(57) [Claims] 1. A heat-source-side refrigerant cycle comprising a heat-source-side compressor, a heat-source-side four-way valve, a heat-source-side heat exchanger, a heat-source-side pressure reducing device, and a first auxiliary heat exchanger connected in a ring shape. A second auxiliary heat exchanger formed integrally with the exchanger and exchanging heat, a refrigerant cycle device, and a utilization side refrigerant cycle in which the utilization side heat exchanger is connected in an annular manner; and a utilization side heat exchanger is provided in parallel with the utilization side heat exchanger. A third auxiliary heat exchanger, a fourth auxiliary heat exchanger integrally formed with the third auxiliary heat exchanger and exchanging heat, an auxiliary four-way valve, an auxiliary compressor, an auxiliary indoor heat exchanger, an auxiliary indoor side pressure reducing device, and An auxiliary refrigerant cycle in which an auxiliary heat source side pressure reducing device is connected in a ring shape; an outdoor unit including the heat source side refrigerant cycle, the second auxiliary heat exchanger, and the refrigerant transport device; and the use side heat exchanger. A main indoor unit provided with the third auxiliary heat exchanger; A fourth auxiliary heat exchanger, the auxiliary four-way valve, an auxiliary compressor, and an auxiliary heat source-side unit including the auxiliary heat source-side depressurizing device; and an auxiliary indoor heat exchanger and the auxiliary indoor-side depressurizing device. And a supplementary indoor unit.