JP2685269B2 - Multi-room air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerant cycle of a multi-room air conditioner.

2. Description of the Related Art A conventional refrigerant cycle of a multi-room cooling / heating apparatus in which a heat source side refrigerant cycle and a user side refrigerant cycle are separated and heat exchange is performed by an auxiliary heat exchanger is disclosed in JP-A-62-238954. It looks like Figure 2. In the figure, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a pressure reducing device for cooling, 15 is a pressure reducing device for heating, and 16 is a pressure reducing device for cooling during heating.
14 is a check valve for closing, 17 is a check valve for closing the pressure reducing device 15 for heating during cooling, and 18 is a first auxiliary heat exchanger that connects them in an annular shape to form a heat source side refrigerant cycle. There is. 19 is the second
The auxiliary heat exchanger is integrally formed so as to exchange heat with the first auxiliary heat exchanger 18. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigeration during cooling and during heating. Reference numeral 21 denotes a refrigerant transfer device having a reversible characteristic that the refrigerant outflow directions are opposite during cooling and heating, and these are housed in the indoor unit f. Reference numerals 22a and 22b denote user-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'. The second auxiliary heat exchanger 19 and the refrigerant amount adjusting tank 2
0, the refrigerant transfer device 21, the use side heat exchangers 22a and 22b, and the connection pipes i, i ', j, j' are connected in a ring to form a use side refrigerant cycle.

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

During the cooling operation, the refrigerant cycle is as indicated by the solid line in the figure.In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 11 passes through the four-way valve 12 and radiates heat in the heat source-side heat exchanger 13 to condense and liquefy. The pressure is reduced by the cooling expansion valve 14, evaporated in the first auxiliary heat exchanger 18, and circulated to the compressor 12 through the four-way valve 12.
At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjusting tank 20. Is sent to the refrigerant transfer device 21 and is sent to the use side heat exchangers 22a and 22b through the connection pipes i and j by the refrigerant transfer device 21 to absorb heat and evaporate, gasify and connect the connection pipes i ′ and j ′. And circulates to the second auxiliary heat exchanger 19.

On the other hand, during the heating operation, the refrigerant cycle is indicated by a broken line in the drawing, and in the heat source side refrigerant cycle, the high-temperature and high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18 where heat is released and condensed. Liquefaction, decompression device for heating from check valve 17
The pressure is reduced at 15, the heat is absorbed and evaporated at the heat source side heat exchanger 13, and the four-way valve 12
And circulates through the compressor 11. At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and the connection pipes i ′, j ′ To the use-side heat exchanger 22, and is heated and radiated and liquefied. I do.

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 for cooling, 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, the multi-chamber cooling / heating apparatus of the present invention separates the heat source side refrigerant cycle and the use side refrigerant cycle, and the heat source side refrigerant cycle and the use side refrigerant cycle 2 An outdoor unit provided with an auxiliary heat exchanger and a refrigerant transfer device, a main indoor unit provided with a use side heat exchanger and operating in the same manner as the heat source side refrigerant cycle, and a first unit provided in parallel with the use side heat exchanger 3 auxiliary heat exchangers, 4th auxiliary heat exchanger which is integrally formed with this 3rd auxiliary heat exchanger and exchanges heat, auxiliary compressor, auxiliary indoor heat exchanger, auxiliary decompression device, auxiliary four-way valve is connected in a ring And an auxiliary indoor unit that includes the third auxiliary heat exchanger and an auxiliary refrigerant cycle and that can perform the same operation as or a different operation from the heat source side unit.

Operation In the present invention, each of the indoor units can select the cooling / heating operation with respect to one outdoor unit by the configuration described above.

Embodiment Hereinafter, a multi-room cooling / heating device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a refrigerant cycle of a multi-room cooling / heating device according to an embodiment of the present invention. In the figure, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a decompression device for cooling, 15 is a decompression device for heating,
16 is a check valve for closing the heating-time cooling decompression device 14, 17 is a check valve for closing the cooling-time heating decompression device 15, and 18 is a first auxiliary heat exchanger that connects these in a ring shape, A heat source side refrigerant cycle is formed. Reference numeral 19 denotes a second auxiliary heat exchanger which is integrally formed so as to exchange heat with the first auxiliary heat exchanger 18. Reference numeral 20 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigeration during cooling and during heating. Reference numeral 21 denotes a refrigerant transport device having reversible characteristics in which the refrigerant flows in opposite directions during cooling and during heating, and these are housed in the outdoor unit f. A use side heat exchanger 23 is housed in the main indoor unit 24 and is connected to the outdoor unit f through main connection pipes 25a and 25b.

26 is a third auxiliary heat exchanger communicating with the main connecting pipes 25a, 25b, 27 is a fourth auxiliary heat exchanger formed integrally with the third auxiliary heat exchanger for heat exchange, 28 is an auxiliary compressor, 29 Is an auxiliary four-way valve, 30 is an auxiliary pressure reducing device, 31 is an auxiliary indoor heat exchanger that can be used for cooling and heating by the auxiliary compressor 28, and these are housed in the auxiliary indoor unit 32 and are connected to the main connection by the auxiliary connecting pipes 33a, 33b. It communicates with the pipes 25a and 25b.

The second auxiliary heat exchanger 19, the refrigerant amount adjusting tank 20, the refrigerant transfer device 21, the use side heat exchanger, the third auxiliary heat exchanger and the main connecting pipes 25a, 25b, and the auxiliary connecting pipes 33a, 33b are connected in an annular shape. Forming a user side refrigerant cycle, and the fourth auxiliary heat exchanger
27, the auxiliary compressor 28, the auxiliary four-way valve 29, the auxiliary decompressor 30, and the auxiliary indoor heat exchanger 31 are connected in an annular shape to form an auxiliary refrigerant cycle.

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

During the cooling operation, the refrigerant cycle is as indicated by the solid line in the figure.In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 11 passes through the four-way valve 12 and radiates heat in the heat source-side heat exchanger 13 to condense and liquefy. The pressure is reduced by the cooling expansion valve 14, evaporated in the first auxiliary heat exchanger 18, and circulated to the compressor 12 through the four-way valve 12.
At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the use side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjusting tank 20. To the use side heat exchanger 23 through the main connection pipe 25b, and is absorbed and evaporated by the refrigerant transfer apparatus 21, and gasified to pass through the main connection pipe 23a. It will circulate to the exchanger 19.

In addition, the third auxiliary heat exchanger 26 passes through the auxiliary connection pipe 33b.
The liquid refrigerant also circulates from the refrigerant transfer device 21, exchanges heat with the fourth auxiliary heat exchanger 27, and passes through the auxiliary connecting pipe 33a to the main connecting pipe 2
It will be distributed to 5a.

At this time, when the auxiliary indoor unit 32 is in the cooling operation, in the auxiliary refrigerant cycle, the high-temperature high-pressure gas from the auxiliary compressor 28 passes through the auxiliary four-way valve 29 and radiates heat in the fourth auxiliary heat exchanger 27, It is condensed and liquefied, decompressed by the auxiliary decompression device 30, absorbed and evaporated by the auxiliary indoor heat exchanger 31, cooled, and circulated through the auxiliary four-way valve 29 to the auxiliary compressor 28. When the auxiliary indoor unit 32 is in the heating operation, the high-temperature and high-pressure gas from the auxiliary compressor 28 is sent to the auxiliary indoor heat exchanger 31 through the auxiliary four-way valve 29 to be radiated and liquefied for heating. The pressure is reduced in the device 30, absorbed and evaporated in the fourth auxiliary heat exchanger 27, and circulated to the auxiliary compressor 28 through the auxiliary four-way valve 29.

On the other hand, during the heating operation, the refrigerant cycle is indicated by a broken line in the drawing, and in the heat source side refrigerant cycle, the high-temperature and high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18 where heat is released and condensed. Liquefaction, decompression device for heating from check valve 17
The pressure is reduced at 15, the heat is absorbed and evaporated at the heat source side heat exchanger 13, and the four-way valve 12
And circulates through the compressor 11. At this time, the second auxiliary heat exchanger 19 of the use side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and is used through the connection pipe 25a. The refrigerant is sent to the side heat exchanger 23, heated and liquefied to be radiated, sent to the refrigerant transfer device 21 through the connection pipe 25b, and circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

The gas refrigerant from the refrigerant transfer device 21 also flows to the third auxiliary heat exchanger 26 through the auxiliary connection pipe 33a, exchanges heat with the fourth auxiliary heat exchanger 27, and passes through the auxiliary connection pipe 33b to the main connection pipe. It will be distributed to 25b.

At this time, when the auxiliary indoor unit 32 is performing the cooling operation, in the auxiliary refrigerant cycle, the high-temperature and high-pressure gas from the auxiliary compressor 28 passes through the auxiliary four-way valve 29 and releases heat in the fourth auxiliary heat exchanger 27 to condense and liquefy. Then, the pressure is reduced by the auxiliary pressure reducing device 30, absorbed and evaporated by the auxiliary indoor heat exchanger 31, cooled, and circulated to the auxiliary compressor 28 through the auxiliary four-way valve 29.

As described above, according to this embodiment, the heat source side refrigerant cycle and the utilization side refrigerant cycle are separated, and the main indoor unit having the utilization side heat exchanger in the utilization side refrigerant cycle, and the utilization side heat exchanger in parallel. A third auxiliary heat exchanger is provided, and a fourth auxiliary heat exchanger that is formed integrally with the third auxiliary heat exchanger and exchanges heat is provided, and the fourth auxiliary heat exchanger, the auxiliary compressor,
Since the auxiliary refrigerant cycle in which the auxiliary indoor heat exchanger, the auxiliary four-way valve, and the auxiliary pressure reducing device are connected in a ring shape is provided, the auxiliary refrigerant cycle operates in cooling or heating regardless of the operation of the heat source side refrigerant cycle and the use side refrigerant cycle. Will be able to do.

Therefore, there is one outdoor unit, and each indoor unit can freely select a cooling operation or a heating operation.

In the 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.

As described above, the present invention separates the heat source side refrigerant cycle and the use side refrigerant cycle, and the main indoor unit having the use side heat exchanger in the use side refrigerant cycle, and the use side heat exchanger in parallel. A third auxiliary heat exchanger is installed in the
A fourth auxiliary heat exchanger that is integrally formed with the auxiliary heat exchanger to exchange heat is provided, and the fourth auxiliary heat exchanger, auxiliary compressor, auxiliary indoor heat exchanger, auxiliary four-way valve, and auxiliary decompression device are connected in an annular shape. Since the auxiliary refrigerant cycle is provided, the auxiliary refrigerant cycle can perform cooling or heating operation regardless of the operation of the heat source side refrigerant cycle and the use side refrigerant cycle.

Therefore, there is only one outdoor unit, and each indoor unit can freely select between the cooling operation and the heating operation, and the room that needs to perform the cooling operation due to the indoor load such as the middle period and the room that needs to perform the heating operation Are mixed, there is an effect that one outdoor unit can be operated simultaneously with a simple configuration.

[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, 13 ...... Heat source side heat exchanger, 18 ...... First auxiliary heat exchanger, 19 ...... Second auxiliary heat exchanger, 21 ...... Refrigerant transfer device, 23 ...... Use side heat Exchanger, 24 ... Main indoor unit, 26 ... Third auxiliary heat exchanger, 27 ... Fourth auxiliary heat exchanger, 28 ... Auxiliary compressor, 29 ... Auxiliary four-way valve, 30 ... Auxiliary decompressor , 31 …… Auxiliary indoor heat exchanger, 32 …… 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 an annular shape, and the first auxiliary heat. A second auxiliary heat exchanger, which is formed integrally with the exchanger, for exchanging heat, a refrigerant transfer device, and a usage-side heat exchanger, which are annularly connected; a heat-source-side refrigerant cycle and a usage-side refrigerant cycle; An outdoor unit provided with a second auxiliary heat exchanger and a refrigerant transfer device, a main indoor unit provided with a use side heat exchanger and operating in the same operation as the heat source side refrigerant cycle, and provided in parallel with the use side heat exchanger The third auxiliary heat exchanger and the fourth auxiliary heat exchanger integrally formed with the third auxiliary heat exchanger and exchanging heat with each other, the auxiliary compressor, the auxiliary indoor heat exchanger, the auxiliary decompression device, and the auxiliary four-way valve in an annular shape. Auxiliary refrigerant cycle connected to each other and the third auxiliary Multi-chamber air conditioner provided with a possible and the auxiliary indoor unit the heat-source side refrigerant cycle and the same operation and different operation with the exchanger and the auxiliary refrigerant cycle.