JPH04148133A - Cooling and heating device - Google Patents

Abstract

PURPOSE:To enable a proper amount of gaseous refrigerant to be mixed in a refrigerant transporting device by a method wherein a gas-liquid mixing device is disposed between a refrigerant suction side of the refrigerant transporting device and a four-way valve at its utilization side and the cooling and heating device is provided with a gas suction pipe of which one end is inserted into an upper part of the gas-liquid mixing device and the other end is inserted into an outlet pipe disposed at a lower part of the gas-liquid mixing device and with a gas suction control valve for use in adjusting a suction amount of gas at the gas suction pipe. CONSTITUTION:A gas-liquid mixing device 14 is connected between a refrigerant suction side of a refrigerant transporting device 11 and a four-way valve 13 at its utilization side. A gas suction pipe 18 having a gas suction control valve 19 is communicated at its one end with the gas-liquid mixing device 14 and at the other end with an outlet pipe 17. The refrigerant flowed from an inlet pipe 16 is operated such that the gaseous refrigerant is separated at an upper part within the gas-liquid mixing device 14 and the liquid refrigerant is separated at its lower part. When the liquid refrigerant is sucked from an outlet pipe 17 into the refrigerant transporting device 11, the gaseous refrigerant adjusted to a proper amount with the gas suction control valve 19 is sucked through the gas suction pipe 18 under a flow of the liquid refrigerant and then the gaseous refrigerant is mixed with the liquid refrigerant. With such an arrangement, it is always possible to suck a proper amount of gaseous refrigerant to the suction side of the refrigerant transporting device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigerant cycle for a heating and cooling system.

Conventional technology Conventionally, the refrigerant cycle of air-conditioning equipment separated into a heat source side refrigerant cycle and a user side refrigerant cycle was disclosed in Japanese Patent Application Laid-Open No. 62-238.
It was disclosed in Japanese Patent No. 962, and was constructed 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 exchanger on the heat source side, 4 is a pressure reducing device for cooling, 5 is a pressure reducing device for heating, and 6 is a device for closing the pressure reducing device 4 for cooling during heating. A check valve 7 closes the heating pressure reducing device 5 during cooling, and a first auxiliary heat exchanger 8 are connected in an annular manner to form a heat source side refrigerant cycle. A second auxiliary heat exchanger 9 is integrally formed to exchange heat with the first auxiliary heat exchanger 8. 10 is a refrigerant amount adjustment tank that adjusts the amount of refrigerant during cooling and heating.

Reference numeral 11 denotes a refrigerant conveying device, which is housed in the heat source side unit) a. 12 is the user side heat exchanger (user side unit) b
It is housed in the heat source unit a and is connected to the heat source unit a by connecting pipes C and C'. The second auxiliary heat exchanger 9, the refrigerant amount adjustment tank 10, the refrigerant transport device 11, the user-side heat exchanger 12, the user-side four-way valve 13, and the connecting pipes C and C' are connected in a ring to form a user-side refrigerant cycle. are doing.

The operation of the heating and cooling system configured as described above will be explained.

During cooling operation, the refrigerant cycle is indicated by the solid line in the figure. In the refrigerant cycle on the heat source side, high-temperature, high-pressure gas from the compressor 1 passes through the four-way valve 2, radiates heat in the heat exchanger 3 on the heat source side, condenses and liquefies, and closes the check valve 6. The air is depressurized by the cooling expansion valve 4, evaporated by 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 user side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, and the gas refrigerant of the user side refrigerant cycle is cooled and liquefied, and the refrigerant amount adjustment tank 10
．． The refrigerant is sent to the refrigerant conveying device 11 through the four-way valve 13 on the user side, and the four-way valve 13 . It is sent to the user-side heat exchanger 12 through the connecting pipe C, cooled, endothermically evaporated, gasified, and circulated to the second auxiliary heat exchanger 9 through the connecting pipe C'.

On the other hand, during 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 1 is sent from the heat source side four-way valve 2 to the first auxiliary heat exchanger 8, where it radiates heat. It is condensed and liquefied, the pressure is reduced through the check valve 7 by the heating pressure reducing device 5, it is endothermically evaporated in the heat source side heat exchanger 3, and is circulated through the heat source side four-way valve 2 to the compressor 1. At this time, the second auxiliary heat exchanger 9 of the user-side refrigerant cycle and the first auxiliary heat exchanger 8 exchange heat, and the liquid refrigerant in the user-side refrigerant cycle is heated and gasified, passing through the connecting pipe C'. User side heat exchanger 1
The refrigerant is sent to the refrigerant transfer device 11 after being heated and liquefied by heat dissipation, measured through the four-way valve 13 on the use side of the connecting pipe C2, and then circulated from the refrigerant amount adjustment tank 1o to the second auxiliary heat exchanger 9.

Problems to be Solved by the Invention However, with the above configuration, only liquid refrigerant is often sucked into the refrigerant conveying device 11 depending on the operating conditions. A portion of it evaporates, creating bubbles and causing abnormal expansion. This causes abnormal vibrations and abnormal sounds in the refrigerant conveying device 11, which damages the refrigerant conveying device 11 and makes the system operation unstable, resulting in insufficient heat exchange amount in the auxiliary heat exchanger 8.9 during heating. However, there was a problem in that the high pressure on the heat source side could rise and cause the operation to stop.

In addition, when the amount of gas intake is large, the amount of refrigerant conveyed decreases, resulting in insufficient capacity of the indoor unit, and at the same time, during heating, the amount of heat exchanged by the auxiliary heat exchangers 8 and 9 becomes insufficient, and the high pressure on the heat source side increases. The problem was that there was a risk that the system would stop operating.

In view of the above-mentioned problems, the present invention provides an air-conditioning device that mixes an appropriate amount of gas refrigerant into a refrigerant transport device according to operating conditions, and can always operate stably without damaging the refrigerant transport device.

Means for Solving the Problems In order to solve the above problems, the air conditioning system of the present invention is provided with a gas-liquid mixer between the refrigerant suction side of the refrigerant transport device and the four-way valve on the user side, and the gas-liquid mixer is a gas suction pipe, one end of which is inserted into the upper part of the gas-liquid mixer, and the other end of which is inserted into an outlet pipe provided at the bottom of the gas-liquid mixer in the flow direction of the refrigerant in the outlet pipe; and this gas suction pipe. It is equipped with a gas intake control valve that adjusts the amount of gas intake.

Effect of the present invention With the above-described configuration, gas-liquid mixed refrigerant mixed with an appropriate amount of gas refrigerant can be sucked into the refrigerant conveying device both during cooling and heating, and a part of the liquid refrigerant evaporates and bubbles are generated. In addition, it is possible to absorb abnormal expansion even in the case of a refrigerant, and also to adjust the amount of gas intake and control the amount of refrigerant conveyed.

EXAMPLE Hereinafter, a heating and cooling system according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a gas-liquid mixer for a heating and cooling system according to an embodiment of the present invention. In FIG. 1, 14 is a gas-liquid mixer, 15 is an outer wall of the gas-liquid mixer, and 16 is an inlet pipe provided at the upper part of the gas-liquid separator, which is connected to a four-way valve on the usage side. Reference numeral 17 denotes an outlet pipe provided at the bottom of the gas-liquid mixer, which is connected to the suction side of the refrigerant conveying device. A gas suction pipe 18 has one end inserted into the upper part of the gas-liquid mixer 14 and the other end inserted in the flow direction of the refrigerant in the air pipe 17 provided at the lower part of the gas-liquid mixer 14. Reference numeral 19 denotes a gas suction control valve provided in the gas suction pipe 18 to adjust the amount of gas suctioned. FIG. 2 shows a refrigerant cycle of a heating and cooling system according to an embodiment of the present invention. In FIG. 2, the gas-liquid mixer 14 is connected between the refrigerant suction side of the refrigerant conveying device 11 and the four-way valve 13 on the usage side. Gas suction pipe 18 with gas suction control valve 19
One end communicates with the gas-liquid mixer 14, and the other end communicates with the outlet pipe 17. The rest is the same as the conventional example, and the same reference numerals are used here to omit the explanation. The operation of this refrigerant cycle is also the same as that of the conventional example, and the details will be omitted, but the gas-liquid mixer 14, which is different from the conventional example, will be explained below.

The refrigerant flowing through the inlet pipe 16 is separated into the gas-liquid mixer 14, with the gas refrigerant in the upper part and the liquid refrigerant in the lower part. Outlet pipe 1
When the liquid refrigerant is sucked into the refrigerant conveying device 11 from 7, the flow of the liquid refrigerant causes the gas suction control valve 19 to be
The appropriate amount of gas refrigerant is sucked in and mixed with liquid refrigerant. Thereby, an appropriate amount of gas refrigerant can be drawn into the suction side of the refrigerant conveying device 11 at all times.

As described above, according to this embodiment, the gas-liquid mixed refrigerant mixed with an appropriate amount of gas refrigerant can be sucked into the refrigerant conveying device 11 in the user-side refrigerant cycle for both cooling and heating. can solve the following problems.

It goes without saying that by adjusting the intake amount by the gas suction control valve 19, the amount of refrigerant transported by the refrigerant transport device 11 can be controlled, which can also be used to control the capacity of the refrigerant transport device 11.

Effect of the invention As described above, the present invention includes a compressor and a four-way valve.

A heat source side refrigerant cycle formed by connecting a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger in a ring, and a second auxiliary heat exchanger that is formed integrally with the first auxiliary heat exchanger and exchanges heat. Side four-way valve, refrigerant conveyance device.

a user-side refrigerant cycle in which a user-side heat exchanger is connected in a ring; a gas-liquid mixer provided between the suction side of the refrigerant conveying device and the user-side four-way valve; and one end located above the gas-liquid mixer. a gas suction pipe, the other end of which is inserted into an outlet pipe provided at the lower part of the gas-liquid mixer in the flow direction of the refrigerant in the outlet pipe; and a gas suction pipe provided in the gas suction pipe to adjust the amount of gas suction. Since the gas suction control valve is provided, the gas-liquid mixed refrigerant mixed with an appropriate amount of gas refrigerant can be sucked into the refrigerant conveying device through the gas suction pipe during both cooling and heating.

Therefore, abnormal expansion caused by too little gas intake can be prevented, so there is no abnormal vibration or noise in the refrigerant conveyance device, no damage to the refrigerant conveyance device, system operation is not unstable, and the auxiliary heat exchanger is not used during heating. It is possible to prevent the possibility that the high pressure on the heat source side will rise due to insufficient heat exchange amount and the operation will stop.

In addition, there is a risk of a reduction in the amount of refrigerant conveyed due to an excessive amount of gas intake, insufficient capacity of the indoor unit, and a rise in high pressure on the heat source side due to insufficient heat exchange with the auxiliary heat exchanger during heating, causing the operation to stop. It can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a gas-liquid separation device installed in an air-conditioning system which is an embodiment of the present invention, Fig. 2 is a refrigerant cycle diagram of the air-conditioning system which is an embodiment of the invention, and Fig. 3 is a conventional FIG. 2 is a refrigerant cycle diagram of the heating and cooling device. 3...Heat source side heat exchanger, 8...First auxiliary heat exchanger, 9...Second auxiliary heat exchanger, 11.
...Refrigerant conveyance device, 12...Use side heat exchanger, 13...Use side four-way valve, 14...
- Gas-liquid mixer, 17...Outlet pipe, 18...
...Gas suction pipe, 19...Gas suction control valve. Name of agent: Patent attorney Akira Okaji and 2 others l4
・-・ t7 ・- t8 ・・- 19... Gas-liquid mixture each opening force ゛ Long suction (Good shoulder ψ; ≧F4−"

Claims (1)

[Claims] Compressor, four-way valve, heat source side heat exchanger, pressure reducing device and first
A heat source side refrigerant cycle formed by connecting auxiliary heat exchangers in a ring shape, a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat, a user side four-way valve, a refrigerant conveying device, and a user side. a user-side refrigerant cycle in which heat exchangers are connected in a ring, a gas-liquid mixer provided between the suction side of the refrigerant conveying device, and the user-side four-way valve; a gas suction pipe, the other end of which is inserted into an outlet pipe provided at the lower part of the gas-liquid mixer in the flow direction of the refrigerant in the outlet pipe; and a gas suction pipe provided in the gas suction pipe to adjust the amount of gas suction. A heating and cooling system equipped with a gas intake control valve.