JP2001033111A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a multi-room type air conditioner employing nonazeotrope refrigerant in which refrigerant passes through a capillary tube without generating any noise, gas phase and liquid phase are conducted while being mixed in good balance to each indoor unit and refrigerating capacity is not differentiated among indoor units. SOLUTION: A receiver tank 3 for storing nonazeotrope refrigerant in gas phase and liquid phase is provided on the outlet side of an outdoor heat exchanger 2. Gas phase refrigerant outlet and liquid phase refrigerant outlet of the receiver tank 3 are coupled, respectively, with first and second branch pipes 6, 7 having a plurality of outlets corresponding to a plurality of refrigerant circuits and the refrigerant delivered from the first and second branch pipes 6, 7 join the plurality of refrigerant circuits.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room air conditioner using a non-azeotropic mixed refrigerant, and more particularly, to a method for balancing the composition ratio of refrigerant flowing through a plurality of indoor heat exchangers. The present invention relates to a configuration of a refrigerant distribution circuit.

[0002]

2. Description of the Related Art There is a multi-room type air conditioner in which a plurality of indoor units are connected to one outdoor unit. FIG. 2 shows an example of the refrigeration cycle of this multi-chamber air conditioner. After the refrigerant discharged from the compressor 11 is passed through the outdoor heat exchanger 12, the throttling means 13 and a plurality of outlets are connected. Each of the pressure adjusting mechanisms 15a, 15b, 16c, through the branch pipe 14 provided, and a plurality of refrigerant circuits including the indoor heat exchangers 16a, 16b, 16c are circulated and connected to return to the compressor 11 by piping. As the refrigerant, a non-azeotropic mixed refrigerant (R407C) effective for preventing ozone layer destruction is used.

[0003] The non-azeotropic refrigerant (R407C) is R
A mixture of three refrigerants having different boiling points of R32a, R125a, and R134a.
Since the condensation pressure is lower than that of R125a, the refrigerant after passing through the outdoor heat exchanger (condenser) 12 is a refrigerant in which a gas phase and a liquid phase are mixed. However, when the refrigerant in which the gas phase and the liquid phase are mixed passes through the throttle means 13 such as a capillary tube, a loud refrigerant noise is generated. In addition, there is a problem in that refrigerant having a small or large liquid phase flows into the refrigerant diverted to each indoor heat exchanger, resulting in a difference in refrigeration capacity for each indoor unit.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not emit refrigerant noise when the refrigerant passes through a capillary tube, and causes each indoor unit to generate a gas phase and a liquid phase. And distributing them in a well-balanced manner, thereby providing an air conditioner in which there is no difference in refrigeration capacity for each indoor unit.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a plurality of outlets after a refrigerant discharged from a compressor is passed through an outdoor heat exchanger. A multi-chamber air conditioner configured to circulate through a pipe to a plurality of refrigerant circuits including throttling means and an indoor heat exchanger and return to the compressor, and using a non-azeotropic mixed refrigerant as the refrigerant. A receiver tank for storing the non-azeotropic mixed refrigerant in a gaseous phase and a liquid phase state between the outdoor heat exchanger and the branch pipe; and a gas phase refrigerant outlet and a liquid phase refrigerant outlet of the receiver tank. Connected to the first and second branch pipes each having a plurality of outlets respectively corresponding to the plurality of refrigerant circuits, and joining refrigerant discharged from the first and second branch pipes to the plurality of refrigerant circuits. The configuration is such that the

Further, the non-azeotropic mixed refrigerant may be R32, R
A mixed refrigerant R407 consisting of 125 and R134a
This is a configuration using c. Further, the first and second throttle means are configured by a capillary tube.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
It will be described based on. In the figure, 1 is a compressor, 2 is an outdoor heat exchanger, 3 is a receiver tank which divides refrigerant discharged from the outdoor heat exchanger 2 into a gaseous refrigerant 3a and a liquid refrigerant 3b, and 4 is a depressurized gas refrigerant 3a. A first throttle means (capillary tube), 5 a second throttle means (capillary tube) for decompressing the liquid-phase refrigerant 3b, 6 a first branch pipe for branching the gas-phase refrigerant 3a in a plurality of directions, 7 is a second branch pipe for dividing the liquid-phase refrigerant 3b in a plurality of directions, and 8a, 8b and 8c are first and second branch pipes.
Merging pipes for merging the gas-phase refrigerant 3a and the liquid-phase refrigerant 3b respectively discharged from the branch pipes 6 and 7; 9a, 9b and 9c are pressure adjusting mechanisms (electronic expansion valves) for adjusting the pressure balance between the indoor units; Ten
a, 10b, and 10c are indoor heat exchangers provided in a plurality of indoor units, respectively.

In the above refrigeration cycle, the refrigerant is a non-azeotropic mixed refrigerant (R407C) effective for preventing ozone layer destruction.
Is used. This non-azeotropic mixed refrigerant (R407C)
Is a mixture of three kinds of refrigerants having different boiling points. The gas-liquid mixed refrigerant that has passed through the outdoor heat exchanger 2 has a liquid-phase refrigerant 3b that is accumulated in the receiver tank 3 on the lower side in the direction of gravity, and the gaseous refrigerant on the upper side. The phase refrigerant 3a accumulates.

After the gaseous refrigerant 3a is decompressed by the first restrictor 4, it is divided by the first branch pipe 6, while the liquid refrigerant 3b is decompressed by the second restrictor 5. , And the refrigerant is further divided by the second branch pipe 7, and these refrigerants are further divided into respective indoor heat exchangers.
Refrigerants discharged from the outlets of the first and second branch pipes 6 and 7 are merged at merging pipes 9a, 9b, and 9c, respectively, so that the composition of the refrigerant flowing through 10a, 10b, and 10c is improved.
It is configured to flow through each indoor heat exchanger 10a, 10b, 10c. With the above configuration, when the refrigerant passes through the throttling means (capillary tube), the refrigerant does not emit a noise, the gas phase and the liquid phase are mixed and distributed to each indoor unit in a well-balanced manner, and the refrigeration capacity is set for each indoor unit. The air conditioner has no difference in the air conditioner.

[0010]

According to the multi-room air conditioner using a non-azeotropic mixed refrigerant as described above and provided with a refrigeration cycle, the refrigerant noise is generated when the refrigerant passes through the throttle means (capillary tube). And a gas phase and a liquid phase are mixed and distributed to each indoor unit in a well-balanced manner, so that there is no difference in refrigeration capacity among the indoor units.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of a multi-room air conditioner showing an embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram of a multi-room air conditioner showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Outdoor heat exchanger 3 Receiver tank 4 Throttling means 5 Throttling means 6 First branch pipe 7 Second branch pipe 8a, 8b, 8c Merging pipe 9a, 9b, 9c Pressure regulation mechanism 10a, 10b, 10c Indoor Heat exchanger

Claims (3)

[Claims] 1. A refrigerant circuit that circulates refrigerant discharged from a compressor to an outdoor heat exchanger, passes through a throttle means, and branches to a plurality of indoor heat exchangers via a branch pipe having a plurality of outlets. In a multi-room air conditioner configured to circulate and return to the compressor, and using a non-azeotropic mixed refrigerant as the refrigerant, the non-azeotropic mixed refrigerant is provided on the outlet side of the outdoor heat exchanger. A receiver tank for storing the gaseous phase and the liquid phase state is provided, and the vapor phase refrigerant outlet and the liquid phase refrigerant outlet of the receiver tank correspond to the plurality of refrigerant circuits via first and second throttle means, respectively. The first and second branch pipes having a plurality of outlets are connected to each other, and the refrigerant discharged from the first and second branch pipes is joined to the plurality of refrigerant circuits. Air conditioner. 2. The non-azeotropic refrigerant mixture of R32, R12
The air conditioner according to claim 1, wherein a three-type mixed refrigerant R407c composed of R5 and R134a is used. 3. The air conditioner according to claim 1, wherein said first and second throttle means comprise a capillary tube.