JPH08178446A - Multi-room type cooler/heater - Google Patents

Abstract

PURPOSE: To improve the performance by reducing the pressure loss at a tube route. CONSTITUTION: The multi-room type cooler/heater comprises a heat source side refrigerant cycle in which a compressor 11, a heat source side heat exchanger 13, pressure reducing units 14, 15 and a first auxiliary heat exchanger 18 are annularly connected, a second auxiliary heat exchanger 19 for heat exchanging with the exchanger 18, a refrigerant conveyor 21, and a user side refrigerant cycle having a plurality of user side heat exchangers 22a, 22b, wherein as the refrigerant of the user side cycle uses refrigerant in which the state is changed between liquid and gas states.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a refrigerant cycle of a multi-room cooling and heating system.

[0002]

2. Description of the Related Art A refrigerant cycle of a conventional multi-chamber heat pump type cooling and heating apparatus 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 that forms a passage bypassing the heating decompression device 4 during cooling, and 6a and 6b are cooling. Decompression device, 7
a and 7b are check valves that form passages that bypass the decompressors 6a and 6b for cooling during heating, 8a and 8b are heat exchangers on the use side, and 9 is an accumulator, which are an outdoor unit a, an indoor unit b, c, and the connection pipe d,
They are connected by d ', e, e', and constitute a known refrigerant cycle.

[0003]

However, in the above configuration, if the connecting pipe between the outdoor unit and the indoor unit becomes long, the amount of refrigerant enclosed in the refrigerant system increases, which may cause damage to the compressor due to liquid compression and the connection. There is a problem that the capacity is greatly reduced due to the pressure loss of the piping. 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.

It is an object of the present invention to provide a multi-room cooling / heating device which can reduce pressure loss in a piping path and improve its performance.

[0005]

In order to solve the above problems, a multi-room cooling and heating system 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, a second auxiliary heat exchanger for exchanging heat with the first auxiliary heat exchanger, a utilization side refrigerant cycle having a refrigerant transfer device and a plurality of utilization side heat exchangers,
A refrigerant that changes its state between a liquid state and a gas state is used as the refrigerant of the utilization side refrigerant cycle.

As a result, the pressure loss in the piping path is reduced and the performance is improved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A multi-chamber cooling and heating system of the present invention comprises 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.
A second auxiliary heat exchanger for exchanging heat with the auxiliary heat exchanger, a refrigerant carrier device, and a usage-side refrigerant cycle having a plurality of usage-side heat exchangers are provided, and are in a liquid state and a gas state as a refrigerant of the usage-side refrigerant cycle. By using a refrigerant that changes state, the structure of the heat source side refrigerant cycle does not change, so even if the length and height difference between the heat source side heat exchanger or compressor and the use side heat exchanger increase, the characteristics of the compressor Since the amount does not decrease and the amount of refrigerant enclosed in the heat source side refrigerant cycle does not increase, damage to the compressor due to liquid compression or poor return of refrigeration 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.

An air conditioner according to an embodiment of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
2 shows a refrigerant cycle of the multi-room cooling and heating device in the embodiment. In FIG. 1, 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 heating decompression device for cooling. A stop valve, 17 is a check valve that closes 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.

A second auxiliary heat exchanger 19 is formed integrally with the first auxiliary heat exchanger 18 so as to exchange heat therewith. 20
Uses a refrigerant amount adjustment tank to adjust the amount of refrigeration during cooling and heating. Reference numeral 21 denotes a refrigerant transporting device having a reversible characteristic in which the refrigerant flows out in the opposite directions during cooling and heating, and these are housed in the outdoor unit f. 22a and 22b are utilization side heat exchangers housed in the indoor units g and h and connected to the outdoor unit f by connection piping. The second auxiliary heat exchanger 19, the refrigerant amount adjustment tank 20, the refrigerant transfer device 21, the use side heat exchangers 22a and 22b, and the connection pipes i, i ',
An annular connection of j and j'forms a use side refrigerant cycle.

The operation of the multi-room cooling and heating apparatus configured as described above will be described. During the cooling operation, the refrigerant cycle is shown by the solid line in the figure. In the heat source side refrigerant cycle, the high-temperature 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 be condensed and liquefied. It is decompressed by the expansion valve 14 for cooling, evaporated by the first auxiliary heat exchanger 18, passed through the four-way valve 12, and circulated to the compressor 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. And is sent to the refrigerant transfer device 21 and
Through the connection pipes i, j by the use side heat exchanger 22
It is sent to a and 22b, endothermicly evaporated, gasified and circulated to the second auxiliary heat exchanger 19 through the connecting pipes i'and j '.

On the other hand, during the heating operation, the refrigerant cycle is shown by the broken line in the figure, and in the refrigerant cycle on the heat source side, 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 to radiate heat. Then, it is condensed and liquefied, decompressed from the check valve 17 by the heating decompression device 15, absorbed and evaporated by the heat source side heat exchanger 13, and circulated to the compressor 11 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 exchanges heat, the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and is sent to the use side heat exchanger 22 through the connecting pipes i ′ and j ′ for heating. And liquefies the heat to liquefy the heat and pass through the connection pipes i and j to convey the refrigerant 2
1, and is circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

As described above, according to the present embodiment, the heat source side refrigerant cycle is separated from the utilization side refrigerant cycle, and the heat source side refrigerant cycle is housed in the outdoor unit and the piping path does not change, so that it is always stable. The same performance can be obtained, and since the piping path of the heat source side refrigerant cycle is short, the pressure loss in the piping path is significantly reduced and high performance can be 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 refrigerant machine oil discharged from the compressor does not stay in the refrigerant cycle and quickly returns to the compressor, so the reliability of the compressor is improved. 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 transfer device, the connection pipe connecting the outdoor unit and the indoor unit becomes long, and the refrigerant circulation amount does not significantly decrease even if the height difference increases. Therefore, the restrictions can be greatly relaxed. In addition, 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 is also stable and high.

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.

(Second Embodiment) Further, even when a plurality of outdoor units 23 are installed as shown in FIG. 2, the connection piping to the indoor unit 24 can be two, which simplifies the construction and reduces the cost. Become cheap.

In the present embodiment, the cooling pressure reducing device 14 and the heating pressure reducing device 17 of the heat source side refrigerant cycle are separately provided, but a reversible pressure reducing 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 in plural.

[0018]

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 exchange. A second auxiliary heat exchanger for exchanging heat with the container, a refrigerant transfer device, and a usage-side refrigerant cycle having a plurality of usage-side heat exchangers, and the status of the usage-side refrigerant cycle changes between a liquid state and a gas state. Since a refrigerant is used, the piping path of the heat source side refrigerant cycle does not change, so the same performance can always be obtained, and since the piping path of the heat source side refrigerant cycle is short, the pressure loss in the piping path is greatly reduced. High performance will be obtained. In addition, the amount of refrigerant filled is also small, so there is no liquid compression because the amount of refrigerant stagnation in the compressor is small, and the refrigeration 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 use side refrigerant cycle, since the refrigerant is circulated by the refrigerant transfer device, even if the distance between the second auxiliary heat exchanger and the use side heat exchanger becomes long or the height difference becomes large. Since the refrigerant circulation amount does not significantly decrease, there is an effect that the restriction can be significantly relaxed. 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 piping diagram of a multi-room air conditioner according to a first embodiment of the present invention.

FIG. 2 is a refrigerant piping diagram of an indoor unit of a multi-room air conditioner according to a second embodiment of the present invention.

FIG. 3 is a refrigerant piping diagram of a conventional multi-room air conditioner

[Explanation of symbols]

 13 Heat Source Side Heat Exchanger 18 First Auxiliary Heat Exchanger 19 Second Auxiliary Heat Exchanger 21 Refrigerant Transfer Device 22 Utilization Side Heat Exchanger

Claims (2)

[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 second auxiliary for exchanging heat with the first auxiliary heat exchanger. A multi-chamber cooling / heating system that includes a heat exchanger, a refrigerant transfer device, and a use-side refrigerant cycle having a plurality of use-side heat exchangers, and uses a refrigerant that changes state between a liquid state and a gas state as a refrigerant in the use-side refrigerant cycle. apparatus. 2. The multi-room cooling and heating apparatus according to claim 1, wherein a refrigerant amount adjusting tank is provided at a position on the upstream side of the second auxiliary heat exchanger during cooling and on the downstream side during heating.