JPH0684828B2 - Multi room air conditioner - Google Patents

Description

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

Conventional technology Conventional refrigerant cycle of multi-chamber heat pump type cooling and heating system
It is constructed as shown in FIG. Reference numeral 1 is a compressor, 2 is a four-way valve, 3 is a heat source side heat exchanger, 4 is a heating decompression device, 5 is a check valve forming a passage bypassing the heating decompression device 4 and 6a and 6b are cooling. Pressure reducing device, 7a, 7b is a pressure reducing device for cooling during heating, a check valve forming a passage bypassing 6a, 6b, 8
a and 8b are heat exchangers on the use side, and 9 is an accumulator, which are provided in the outdoor unit a and the indoor units b and c, and are connected by connecting pipes d, d ′, e and e ′, and are known refrigerant cycles. Are configured.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, if the connection pipe between the outdoor unit and the indoor unit becomes long, the amount of the refrigerant filled in the refrigerant system increases and there is a risk of damage to the compressor due to liquid compression and the connection pipe. There is a problem that the capacity is greatly reduced by the pressure loss of. In addition, it is necessary to control the refrigerant with a solenoid valve to stop the operation of the indoor unit, and to control the capacity of the indoor unit, it is necessary to control the capacity of the compressor and the pressure reducing device, which is a complicated method. Had.

In addition, there is a problem that the installation work must be restricted because there is a large imbalance in capacity due to the length and height of the piping between the indoor units.

Means for Solving the Problems In order to solve the above problems, the multi-room cooling and heating apparatus of the present invention comprises a compressor, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger connected in an annular shape. A heat source side refrigerant cycle and a second auxiliary heat exchanger that is integrally formed with this first auxiliary heat exchanger to exchange heat, a refrigerant transfer device, and a usage side refrigerant cycle having a plurality of usage side heat exchangers Is.

Action The present invention, due to the above configuration, the configuration of the heat source side refrigerant cycle does not change, even if the length or height difference between the heat source side heat exchanger or the compressor and the use side heat exchanger is large, the characteristics of the compressor are degraded. Without doing so, the amount of refrigerant enclosed in the heat source side refrigerant cycle does not increase, so that damage to the compressor due to liquid compression or poor return of refrigerating machine oil can be prevented.

Further, there is no imbalance in the capacity due to the length of the pipes or the difference in height between the heat exchangers on the use side, and the capacity control of the indoor unit can be easily adjusted by the air volume of the indoor unit.

Embodiment An air conditioner according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a refrigerant cycle of a multi-room cooling and heating apparatus according to an embodiment of the present invention. First
In the figure, 11 is a compressor, 12 is a 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 check valve that closes the heating cooling decompression device 14. A valve, 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. 19 is the second auxiliary heat exchanger and the first auxiliary heat exchanger
It is integrally formed to exchange heat with 18. Reference numeral 20 is a refrigerant amount adjustment tank for adjusting the amount of refrigeration during heating during cooling. 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 outdoor unit f. i, i ', j, j', 22a, 22b are utilization side heat exchangers housed in the indoor units g, h and connected to the outdoor unit f by connecting pipes. The second auxiliary heat exchanger 19, the refrigerant amount adjusting tank 20, the refrigerant transfer device 21, the use side heat exchangers 22a, 22b and the connecting pipes i, i ', j, j'are annularly connected to form a use side refrigerant cycle. is doing.

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

During the cooling operation, the refrigerant cycle is shown by the solid line in the figure, and in the refrigerant cycle on the heat source side, the high-temperature high-pressure gas from the compressor 11 is a four-way valve.
The heat is radiated through the heat source side heat exchanger 13 to condense and liquefy, passes through the check valve 16 and is decompressed by the cooling expansion valve 14, evaporated through the first auxiliary heat exchanger 18, passes through the four-way valve 12, and passes through the compressor. Cycle to 12. At this time, the second auxiliary heat exchanger 19 and the first auxiliary heat exchanger 18 of the usage-side refrigerant cycle exchange heat, the gas refrigerant in the usage-side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjustment tank 20. To the use side heat exchangers 22a and 22b through the connection pipes i and j to endothermically evaporate and gasify to form the connection pipes i ′ and j ′. It will be circulated through the second auxiliary heat exchanger 19.

On the other hand, during the heating operation, the refrigerant cycle is indicated by the broken line in the figure, and in the heat source side refrigerant cycle, the high-temperature high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 18,
The heat is radiated to be condensed and liquefied, the pressure is reduced from the check valve 17 by the heating pressure reducing device 15, the heat is absorbed and evaporated by the heat source side heat exchanger 13, and the heat is circulated to the compressor 11 through the four-way valve 12. At this time, the second auxiliary heat exchanger 19 and the first auxiliary heat exchanger 18 of the usage-side refrigerant cycle exchange heat, the liquid refrigerant in the usage-side refrigerant cycle is heated and gasified, and the connecting pipes i ', j' Is sent to the heat exchanger 22 on the use side, is heated to radiate liquid and is sent to the refrigerant transfer device 21 through the connection pipes i and j, and is circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19. To do.

As described above, according to the present embodiment, the heat source side refrigerant cycle and the utilization side refrigerant cycle are separated, and the heat source side refrigerant cycle is housed in the outdoor unit and the piping path does not change, so that the same stable performance is always obtained. In addition, since the heat source side refrigerant cycle has a short piping path, pressure loss in the piping path is significantly reduced and high performance is obtained. In addition, since the amount of refrigerant enclosed is small and the amount of refrigerant stagnation in the compressor is small, there is no liquid compression, and the refrigeration oil discharged from the compressor does not stay in the refrigerant cycle and returns to the compressor quickly, so the reliability of the compressor is high. Greatly improved. Further, since the amount of refrigerant enclosed is small and constant, no accumulator is required. On the other hand, in the use side refrigerant cycle, since the refrigerant is circulated by the refrigerant carrier device, the connection pipe connecting the outdoor unit and the indoor unit becomes long, and the refrigerant circulation amount does not greatly decrease even if the height difference increases. Therefore, the restrictions can be greatly relaxed. Further, since the performance of the outdoor unit is separated and is not affected by this connection pipe and is always constant, the performance of the indoor unit can be stable and high performance can be obtained.

Further, since refrigerating machine oil is not required during the use side refrigerant cycle, an oil trap in the middle of the gas side connecting pipe is not required, and the connecting pipe construction is simplified. Further, even when a plurality of outdoor units 23 are installed as shown in FIG. 2, it is possible to connect two pipes to the indoor unit 24, which simplifies the construction and reduces the cost.

In the embodiment, the pressure reducing device for cooling the heat source side refrigerant cycle
Although 14 and the heating decompression device 17 are separately provided, a reversible decompression device such as an electric expansion valve may be used. Further, although the refrigerant transporting device 21 of the utilization side refrigerant cycle is reversible, two unidirectional refrigerant transporting devices may be used. Although the refrigerant transfer device 21 is provided in the liquid side pipe in the embodiment, it may be provided in the gas side pipe. Further, the refrigerant amount adjusting tank may be provided anywhere in the refrigerant cycle, or a plurality of refrigerant adjusting tanks may be provided.

EFFECTS OF THE INVENTION As described above, according to the present invention, a heat source side refrigerant cycle in which a compressor, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger are connected in an annular shape and the first auxiliary heat exchanger are integrated. Since the second auxiliary heat exchanger that forms and heat-exchanges with each other, and the use-side refrigerant cycle in which the refrigerant transfer device and the use-side heat exchanger are connected in an annular shape are separated from each other, the heat-source-side refrigerant cycle has a pipe path. Since it does not change, stable performance is always obtained, and since the heat source side refrigerant cycle has a short piping path, pressure loss in the piping path is greatly reduced and high performance is obtained. In addition, the amount of refrigerant enclosed is small, there is no liquid compression because the amount of refrigerant stagnation in the compressor is small, and the refrigerating machine oil discharged from the compressor does not stay in the refrigerant cycle and returns to the compressor quickly. Significantly improved. on the other hand,
In the usage-side refrigerant cycle, since the refrigerant is circulated by the refrigerant transfer device, the refrigerant circulation amount is large even if the distance between the second auxiliary heat exchanger and the usage-side heat exchanger is long or the height difference is large. Since it does not decrease, it has the effect of significantly relaxing the restrictions. Further, since the heat source side refrigerant cycle is separated, the performance is always constant, and therefore, the utilization side heat converter has the effect of obtaining stable and high performance.

[Brief description of drawings]

FIG. 1 is a refrigerant cycle diagram of an air conditioner according to an embodiment of the present invention, FIG. 2 is a connection diagram of indoor units according to another embodiment of the present invention, and FIG. 3 is a refrigerant cycle diagram of a conventional air conditioner. 13 ... Heat source side heat exchanger, 18 ... First auxiliary heat exchanger, 19 ...
… Second auxiliary heat exchanger, 21 …… Refrigerant carrier, 22 …… Use side heat exchanger.

Claims (4)

[Claims] 1. A heat source side refrigerant cycle comprising a compressor, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger connected in an annular shape, and a heat generating unit formed integrally with the first auxiliary heat exchanger. A multi-chamber cooling and heating device including a second auxiliary heat exchanger to be exchanged, a refrigerant transfer device, and a usage-side refrigerant cycle having a plurality of usage-side heat exchangers. 2. The multi-room cooling and heating apparatus according to claim 1, wherein a capacity control compressor is mounted on the compressor. 3. The multi-room cooling and heating apparatus according to claim 1, wherein the heat source side refrigerant cycle and the use side refrigerant cycle use different refrigerants. 4. The multi-room cooling and heating apparatus according to claim 1, wherein a laminated heat exchanger is used as the first auxiliary heat exchanger and the second auxiliary heat exchanger.