JP2986535B2 - Air conditioning - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerant cycle of a cooling and heating device.

2. Description of the Related Art Conventionally, a refrigerant cycle of a heating / cooling apparatus separated into a heat source-side refrigerant cycle and a use-side refrigerant cycle is disclosed in
The publication was configured as shown in FIG. In FIG. 3, 1 is a compressor, 2 is a four-way valve on the heat source side, 3
Is a heat source side heat exchanger, 4 is a cooling decompression device, 5 is a heating decompression device, 6 is a check valve that closes the cooling decompression device 4 during heating, and 7 is a reverse valve that closes the heating decompression device 5 during cooling. Stop valve,
Reference numeral 8 denotes a first auxiliary heat exchanger which connects these in a ring shape to form a heat source side refrigerant cycle. Reference numeral 9 denotes a second auxiliary heat exchanger which is integrally formed so as to exchange heat with the first auxiliary heat exchanger 8. Reference numeral 10 denotes a refrigerant amount adjusting tank for adjusting the amount of refrigerant during cooling and during heating. Reference numeral 11 denotes a refrigerant transport device, which is housed in the heat source side unit a. Reference numeral 12 denotes a use side heat exchanger which is housed in the use side unit b and is connected to the heat source unit a by connection pipes c and c '. Reference numeral 13 denotes a use-side four-way valve that changes the flow direction of the refrigerant between cooling and heating. Then, the second auxiliary heat exchanger 9, the refrigerant amount adjusting tank 10, the refrigerant transfer device 11, the use side heat exchanger 12, the use side four-way valve 13, and the connection pipes c and c 'are connected in a ring shape, and the use side refrigerant cycle is performed. Has formed.

The operation of the cooling / heating device 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 heat passes through the high-temperature, high-pressure gas four-way valve 2 from the compressor 1 and is radiated by the heat source-side heat exchanger 3 to condense and liquefy. The pressure is reduced by the cooling expansion valve 4, evaporated in the first auxiliary heat exchanger 8, and circulated to the compressor 1 through the heat source side four-way valve 2. At this time, the second auxiliary heat exchanger 9 of the use side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, and the gas refrigerant of the use side refrigerant cycle is cooled and liquefied, and the refrigerant amount adjusting tank 1
0, is sent to the refrigerant transfer device 11 through the use side four-way valve 13, the use side four-way valve 13, the connection pipe c
Is passed through to the use side heat exchanger 12 to be cooled, absorbed and evaporated, gasified and passed through the connecting pipe c 'to the second auxiliary heat exchanger 9
Will circulate.

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 1 is sent from the heat source side four-way valve 2 to the first auxiliary heat exchanger 8 to radiate heat. The heat is then condensed and liquefied, and the pressure is reduced from the check valve 7 by the heating decompression device 5, absorbed and evaporated by the heat source side heat exchanger 3, and circulated to the compressor 1 through the heat source side four-way valve 2. At this time, the second auxiliary heat exchanger 9 of the use side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, the liquid refrigerant in the use side refrigerant cycle is heated and gasified, and passes through the connection pipe c ′. User side heat exchanger
It is sent to 12 and is heated and radiated and liquefied. It is sent to the refrigerant transfer device 11 through the connection pipe c and the use side four-way valve 13, and circulates from the refrigerant amount adjustment tank 10 to the second auxiliary heat exchanger 9.

However, in the above configuration, only the liquid refrigerant may be sucked into the refrigerant transfer device 11 depending on the operating conditions. Partly evaporates, bubbles are generated and abnormal expansion occurs. For this reason, abnormal vibrations and abnormal noises occur in the refrigerant transport device 11, causing damage to the refrigerant transport device 11 and instable system operation, resulting in a shortage of heat exchange in the auxiliary heat exchangers 8, 9 during heating, There is a problem that the operation may be stopped due to an increase in the high pressure on the heat source side.

The present invention has been made in view of the above problems, and provides an air conditioner that mixes an appropriate amount of a gas refrigerant into a refrigerant transport device according to operating conditions and can always operate stably without damage to the refrigerant transport device.

Means for Solving the Problems In order to solve the above problems, a cooling and heating apparatus according to the present invention includes a heat source in which a compressor, a four-way valve, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger are connected in a ring shape. A side refrigerant cycle, a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and heat-exchanging, a utilization side four-way valve, a utilization side refrigerant cycle in which the refrigerant conveyance device and the utilization side heat exchanger are connected in a ring shape. A gas-liquid mixer provided between the suction side of the refrigerant transport device and the use-side four-way valve, one end of which is communicated with the upper portion of the gas-liquid mixer, and the other end of which is a suction pipe of the refrigerant transport device. A gas suction pipe communicated with a gas-liquid mixer, one end of which is communicated with a lower portion of the gas-liquid mixer;
The other end is provided with a liquid suction pipe that communicates with the suction pipe and allows a liquid refrigerant to flow into the refrigerant transport device, and a liquid suction control valve that adjusts a liquid suction amount of the liquid suction pipe.

Effect of the Invention According to the present invention, a gas-liquid mixed refrigerant mixed with an appropriate amount of a gas refrigerant can be sucked into a refrigerant transport device during cooling and heating by the above-described configuration, and a part of the liquid refrigerant evaporates and bubbles are generated. Abnormal expansion can also be absorbed, and the amount of liquid suction can be adjusted to control the amount of refrigerant transported.

Embodiment Hereinafter, a cooling and heating apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a gas-liquid mixer used in a cooling and heating apparatus according to one embodiment of the present invention. First
In the figure, 14 is a gas-liquid mixer, 15 is the outer wall of the gas-liquid mixer,
Reference numeral 16 denotes an inlet pipe provided at the upper part of the gas-liquid separator.
Is connected to the use-side four-way valve 13. Reference numeral 17 denotes a liquid suction pipe having one end communicating with the lower part of the gas-liquid mixer 14 and the other end communicating with a suction pipe 18 of the refrigerant transport device 11 to allow the liquid refrigerant to flow into the refrigerant transport device 11. One end 19 communicates with the upper part of the gas-liquid mixer 14, and the other end communicates with the suction pipe 18 of the refrigerant transport device 11,
This is a gas suction pipe through which gas refrigerant flows. Reference numeral 20 denotes a liquid suction control valve provided in the liquid suction pipe 17 to adjust the liquid suction amount. FIG. 2 shows a refrigerant cycle of the cooling / heating device in the embodiment of the present invention. In FIG. 2, reference numeral 14 denotes a gas-liquid mixer, which is connected between the refrigerant suction side of the refrigerant transfer device 11 and the use side four-way valve 13. The same components of the conventional example are denoted by the same reference numerals, and the description thereof is omitted. The operation of the refrigerant cycle is also the same as that of the conventional example, and the details are omitted. In the refrigerant flowing from the inlet pipe 16, the gas refrigerant is separated into the upper part and the liquid refrigerant is separated into the lower part in the gas-liquid mixer 14. The liquid refrigerant adjusted by the liquid suction control valve 20 is drawn into the suction pipe 18 of the refrigerant transfer device 11 from the liquid suction pipe 17. At this time, the gas refrigerant is sucked from the gas suction pipe 19 by the flow and pressure difference of the liquid refrigerant, and is mixed with the liquid refrigerant. Thereby, the refrigerant transport device
An appropriate amount of liquid refrigerant and gas refrigerant can always be sucked into the suction side 11.

As described above, according to the present embodiment, a gas-liquid mixed refrigerant mixed with an appropriate amount of gas refrigerant can be sucked into the refrigerant transfer device 11 in the use-side refrigerant cycle for both cooling and heating. Even if it evaporates and bubbles are generated, abnormal expansion can be absorbed. Therefore, abnormal vibration and abnormal sound of the refrigerant transfer device occur, which causes damage to the refrigerant transfer device and unstable system operation, and during heating, the amount of heat exchange in the auxiliary heat exchanger becomes insufficient. It is possible to solve the problem of the related art that there is a possibility that the operation may stop due to the rise.

By adjusting the liquid suction amount by the liquid suction control valve 20, the refrigerant transfer amount of the refrigerant transfer device 11 can be controlled, and it goes without saying that it can be used for controlling the capacity of the refrigerant transfer device 11.

Effect of the Invention As described above, in the present invention, the heat source side refrigerant cycle in which the compressor, the four-way valve, the heat source side heat exchanger, the pressure reducing device, and the first auxiliary heat exchanger are connected in a ring shape, A second auxiliary heat exchanger formed integrally with the heat exchanger and exchanging heat, a use side four-way valve, a refrigerant transfer device and a use side refrigerant cycle in which the use side heat exchanger is connected in an annular manner, and a suction side of the refrigerant transfer device A gas-liquid mixer provided between the use-side four-way valve, a gas suction pipe having one end communicating with the upper portion of the gas-liquid mixer, and the other end communicating with a suction pipe of the refrigerant transport device, A liquid suction pipe having one end communicating with the lower portion of the gas-liquid mixer and the other end communicating with the suction pipe for allowing a liquid refrigerant to flow into the refrigerant transport device; and a liquid suction for adjusting a liquid suction amount of the liquid suction pipe. With a control valve, a gas-liquid mixture containing an appropriate amount of gas refrigerant is used for cooling and heating. The combined refrigerant can be sucked into the transport device, for example. Therefore, even if a part of the liquid refrigerant evaporates and bubbles are generated, abnormal expansion can be absorbed, so that abnormal vibration and abnormal sound of the refrigerant transport device are generated, damage to the refrigerant transport device and system operation become unstable, and during heating, It is possible to solve the problem of the related art in which the amount of heat exchange in the auxiliary heat exchanger becomes insufficient, and the high pressure on the heat source side may increase to stop the operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gas-liquid separator used in a cooling and heating device according to one embodiment of the present invention, FIG. 2 is a refrigerant cycle diagram of the cooling and heating device according to one embodiment of the present invention, and FIG. It is a refrigerant cycle diagram of an apparatus. 1 ... compressor, 2 ... 4-way valve, 3 ... heat source side heat exchanger,
4,5 ... decompression device, 8 ... first auxiliary heat exchanger, 9 ... second auxiliary heat exchanger, 11 ... refrigerant transfer device, 12 ... use side heat exchanger, 13 ... use side four directions Valve, 14 ... gas-liquid mixer, 17 ...
... liquid suction pipe, 18 ... suction pipe, 19 ... gas suction pipe, 20 ...
Liquid suction control valve.

Claims (1)

(57) [Claims] 1. A heat source side refrigerant cycle in which a compressor, a four-way valve, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger are connected in a ring, and formed integrally with the first auxiliary heat exchanger. A second auxiliary heat exchanger for performing heat exchange, a use-side four-way valve, a use-side refrigerant cycle in which the refrigerant transfer device and the use-side heat exchanger are connected in an annular manner, and a suction side of the refrigerant transfer device and the use-side four-way valve. A gas-liquid mixer provided between the gas-liquid mixer, a gas suction pipe having one end communicating with the upper part of the gas-liquid mixer and the other end communicating with a suction pipe of the refrigerant transport device, and one end of the gas-liquid mixer. A cooling and heating device comprising: a liquid suction pipe that communicates with a lower portion, the other end of which is connected to the suction pipe, and flows into the liquid refrigerant transport device; and a liquid suction control valve that adjusts a liquid suction amount of the liquid suction pipe.