JP2796093B2 - 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 cooling and heating device separated into a heat source side refrigerant cycle and a use side refrigerant cycle has been configured as shown in FIG. In FIG. 2, 1 is a compressor, 2 is a heat source side four-way valve, 3 is a heat source side heat exchanger, 4 is a decompression device for cooling, 5
Is a check valve for closing the depressurizing device for cooling 4 during heating, 7 is a check valve for closing the depressurizing device 5 for cooling during heating, and 8 is a first auxiliary heat exchanger. Are connected in a ring,
A heat source side refrigerant cycle is formed. 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 tank for adjusting the amount of refrigerant during cooling and during heating. 11 is a refrigerant transport device having reversible characteristics in which the outflow direction of the refrigerant is opposite during cooling and during heating,
These are 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 has connection pipes c,
It is connected to the heat source side unit a at c '. The second auxiliary heat exchanger 9, the refrigerant tank 10, the refrigerant conveying device 11, the use side heat exchanger 12, and the connection pipe are connected in a ring to form a use side refrigerant cycle. In addition, d and d 'are service valves (three-way valves) and serve as connection ports for connection pipes c and c'.
It is used as a pressure check for the use-side refrigerant cycle and as a refrigerant charging port.

The operation of the cooling / heating device configured as described above will be described.

During the cooling operation, the refrigerant cycle is a solid line in the figure. In the heat source-side refrigerant cycle, the high-temperature and high-pressure gas from the compressor 1 passes through the four-way valve 2 and radiates heat in the heat source-side heat exchanger 3 to condense and liquefy. Then, 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 and the first auxiliary heat exchanger 8 of the use-side refrigerant cycle exchange heat, and the gas refrigerant in the use-side refrigerant cycle is cooled and liquefied. It is sent to the transfer device 11 and is sent to the use side heat exchanger 12 through the connection pipe c by the refrigerant transfer device 11 to be cooled, absorbed and evaporated, gasified and passed through the connection pipe c 'to the second auxiliary heat. It will circulate to the exchanger 9.

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, heated and radiated and liquefied, sent to the refrigerant transfer device 11 through the connection pipe c, and circulated from the refrigerant tank 10 to the second auxiliary heat exchanger 9.

Problems to be Solved by the Invention However, in the configuration as described above, when the refrigerant is charged into the use-side refrigerant cycle, the heat source side unit and the use side unit are set to the cooling operation, and are filled from the service valves d and d ′. However, when the cooling / heating filling amount is small, the amount of heat exchange in the second auxiliary heat exchanger 9 is also small because the flow of gas refrigerant into the refrigerant conveying device 11 is large and the conveying capacity is not sufficiently obtained. The pressure in the use-side refrigerant cycle decreases only gradually. Therefore, there is a problem that it takes a long time to fill the refrigerant.

The present invention has been made in view of the above problems, and provides a cooling and heating device that can easily charge a refrigerant to a use-side refrigerant cycle with a simple configuration in a short time.

Means for Solving the Problems In order to solve the above problems, the cooling and heating device of the present invention,
A refrigerant coil provided in the refrigerant tank provided in the use-side refrigerant cycle to allow the low-temperature refrigerant in the heat source-side refrigerant cycle to flow is provided, and the refrigerant tank is provided with a refrigerant charging port.

Effect of the Invention According to the present invention, when a refrigerant is sealed in the use-side refrigerant cycle, the low-temperature refrigerant in the heat source-side refrigerant cycle flows through the cooling coil provided in the refrigerant tank, and the refrigerant sealed in the refrigerant tank is provided. Since the refrigerant is sealed from the inlet, the sealed refrigerant is immediately cooled, so that the pressure in the use-side refrigerant cycle can be reduced.

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 refrigerant cycle of a cooling and heating apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 13 denotes a cooling coil, which is provided in the refrigerant tank 10. Numeral 14 denotes an electromagnetic valve which controls the flow of low-temperature refrigerant in the heat source side refrigerant cycle to the cooling coil 13. Reference numeral 15 denotes a refrigerant charging port, which is provided in a shell of the refrigerant tank 10. Others are the same as those in FIG.

Also, the operation during normal cooling and heating operation is the same as before,
Here, the operation when the refrigerant is charged in the installation work and the service of a device different from the conventional one will be described. In the case of installation work, the heat source side unit a and the use side unit b are installed and connected by the connection pipes c and c ′, and the air in the use side refrigerant cycle is evacuated from the service valves d and d ′ or the refrigerant inlet 15. It is removed by a pump, and the refrigerant is charged through the refrigerant charging port 15. At this time, the refrigerant is charged to a certain extent (for example, 1/10 of the total charged amount), the refrigerant cycle of the heat source side refrigerant cycle is performed, and the first auxiliary heat exchanger 8 and the second auxiliary heat exchanger 9 are heat-exchanged to be in the usage side refrigerant cycle. Pressure to reduce the pressure of the heat source side refrigerant cycle through the cooling coil 13 provided in the refrigerant tank 10 to reduce the pressure in the refrigerant tank 10. It can be lowered even lower. Therefore, refrigerant inlet 15
Will be cooled quickly.

As described above, according to the present embodiment, when the refrigerant is sealed in the use-side refrigerant cycle, the heat-source-side refrigerant cycle is operated, and the low-temperature refrigerant in the heat-source-side refrigerant cycle is provided in the refrigerant tank of the use-side refrigerant cycle. Since the refrigerant is sealed from the refrigerant inlet provided in the refrigerant tank while flowing through the cooling coil, the enclosed refrigerant is immediately cooled, and the pressure in the use-side refrigerant cycle can be reduced. It can be done quickly and reliably. Further, when the charging of the refrigerant is considerably advanced (for example, 2/3 of the total charging amount), the refrigerant pump may be operated to further shorten the charging time of the refrigerant.

Effect of the Invention As described above, the present invention provides a cooling coil and a refrigerant charging port in the refrigerant tank so that the low-temperature refrigerant in the heat source-side refrigerant cycle flows through the refrigerant tank provided in the use-side refrigerant cycle. At the time of charging the refrigerant into the use-side refrigerant cycle, the heat-source-side refrigerant cycle is operated, and while the low-temperature refrigerant in the heat-source-side refrigerant cycle flows through the cooling coil provided in the refrigerant tank, the refrigerant is charged from the refrigerant charging port. So
Since the sealed refrigerant is cooled immediately and the pressure in the use-side refrigerant cycle can be reduced, there is an effect that the refrigerant can be charged quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a refrigerant cycle diagram of a cooling and heating device in one embodiment of the present invention, and FIG. 2 is a refrigerant cycle diagram of a conventional cooling and heating device. 3 ... heat source side heat exchanger, 8 ... first auxiliary heat exchanger, 9 ...
... second auxiliary heat exchanger, 10 ... refrigerant tank, 11 ... refrigerant transport device, 12 ... use side heat exchanger, 13 ... cooling coil, 14
… Solenoid valve, 15… Refrigerant charging port.

Claims (1)

(57) [Claims] 1. 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 a ring shape, and a heat exchange formed integrally with the first auxiliary heat exchanger. A second auxiliary heat exchanger and a use-side refrigerant cycle in which a refrigerant transfer device, a refrigerant tank, and a use-side heat exchanger are connected in a ring shape, and the low-temperature refrigerant in the heat-source-side refrigerant cycle flows through the refrigerant tank. A cooling and heating device provided with a cooling coil and a refrigerant charging port in the refrigerant tank.