JPH03260527A - Airconditioning apparatus - Google Patents

Abstract

PURPOSE:To obtain an airconditioning apparatus which has a direction of circulating a refrigerant in a user's refrigerant cycle reversible simply with a unidirectional refrigerant conveying device by arranging a third valve in parallel with a second valve and a refrigerant conveying device and a fourth valve in parallel with a first valve and the refrigerant conveying device. CONSTITUTION:In the cooling operation, a first valve 13a and a second valve 13b are opened while a third valve 13c and a fourth valve 13d are closed and in the heating operating, the valves are opened and closed in an opposite sequence, which makes the direction of circulation reversible in a user's side refrigerant cycle even when a refrigerant conveying device is unidirectional. In such a manner, the direction of circulation in the user's side refrigerant cycle can be made reversible with the opening or closing of four inexpensive valves such as solenoid valves even when the refrigerant conveying device in the user's side refrigerant cycle is unidirectional, thereby achieving inexpensiveness with a simple construction of the refrigerant conveying device.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION 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 μ and a user side refrigerant cycle was disclosed in Japanese Patent Application Laid-Open No. 62-2720.
The button was shown in Publication No. 40 and was constructed as shown in Figure 2. In Fig. 2, 1 is a compressor, 2 is a four-way valve, 3 is a heat source side heat exchanger, 4 is a cooling pressure reducing device, 6 is a heating pressure reducing device, and 6 is a cooling pressure reducing device 4 that closes during heating. non-return valve,
Reference numeral 7 denotes a check valve that closes the pressure reducing device 5 for heating during cooling, and 8 denotes a first auxiliary heat exchanger, which 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 has a reversible characteristic such that the refrigerant flows in opposite directions during cooling and heating, and is housed in the heat source side unit 7)a. Reference numeral 12 denotes a heat exchanger on the user side, which is housed in the user side unit) b and is connected to the heat source side unit a through connecting pipes C and C'. The second auxiliary heat exchanger 9 and the refrigerant amount adjustment tank 10° refrigerant conveying device 11. The user-side heat exchanger 12 and the connecting pipe f are connected in an annular manner to form a user-side refrigerant cycle.

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 through the 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
The auxiliary heat exchanger 8 exchanges heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied, and is sent to the refrigerant transport device 11 through the refrigerant amount adjustment tank 10.
It is sent to the user side heat exchanger 12 through the connecting pipe C, where it is cooled, endothermically evaporated, gasified, and circulated through the connecting pipe ♂ to the second auxiliary heat exchanger 9.

When one valve is pressed during heating operation, the refrigerant cycle shown by the broken line in the figure is activated.In the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 1 is sent from the four-way valve 2 to the first auxiliary heat exchanger 8.
It radiates heat, condenses and liquefies, reduces the pressure through the check valve 7 with the heating pressure reducing device 6, absorbs heat and evaporates in the heat source side heat exchanger 3, and circulates through the 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'. Sent to the user side heat exchanger 12,
The refrigerant is heated, radiates heat, liquefies it, and passes through the connecting pipe C to the refrigerant transport device 1.
1 and circulated from the refrigerant amount adjustment tank 10 to the second auxiliary heat exchanger 9.

Problems to be Solved by the Invention However, in the above configuration, the refrigerant transport device of the user-side refrigerant cycle must have reversible characteristics, which leads to a problem that the refrigerant transport device becomes complicated in structure and becomes expensive. It had

Means for Solving the Problems In order to solve the above problems, the air conditioning system of the present invention includes:
A third valve is provided in parallel with the second valve and the refrigerant transfer device, and a fourth valve is provided in parallel with the second valve and the refrigerant transfer device.

Effect: With the above-described configuration, the present invention allows the refrigerant circulation direction of the user-side refrigerant cycle p to be easily reversible using the unidirectional refrigerant transport device.

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 a refrigerant cycle of a heating and cooling system according to an embodiment of the present invention.

Referring to FIG. 1, 13a is the first valve, 13b is the second valve, 1
3c is a third valve, 13d is a fourth valve, and the third valve 13a, the refrigerant conveying device 11, and the second valve 13b are connected in series, and the refrigerant conveying device 11 and the second valve 13b are connected in parallel. Third valve 1
3C is provided, and a refrigerant conveying device 11 and a third valve 13 are provided.
A fourth valve 13d is provided in parallel to a. In this embodiment, the first, second, third, and fourth valves are described as electromagnetic valves, but they may also be flow control valves or the like. The rest is the same as the conventional example, and the same reference numerals are used here to omit the explanation. The operation of the shunted refrigerant cycle is also the same as that of the conventional example, so the details are omitted, but during cooling operation, the
By opening the valve 13a and the second valve 13b and closing the third valve 13C9 and the fourth valve 13d, and conversely opening and closing each valve during interrupted heating operation, the refrigerant conveying device can be used even in one direction. The circulation direction of the side refrigerant cycle can be made reversible.

As described above, according to this embodiment, even if the refrigerant transport device that is buttoned to the user-side refrigerant cycle is unidirectional, the circulation direction of the user-side refrigerant cycle can be made reversible by opening and closing four inexpensive valves such as solenoid valves. Therefore, the structure of the refrigerant conveying device is simple and inexpensive.

Effects of the Invention As described above, the present invention provides a first valve and a third valve on the inlet side of the refrigerant conveying device of the user side refrigerant cycle, and a third valve on the outlet side.
Since the fourth valve is provided, even if the refrigerant transport device is unidirectional, the circulation direction of the user-side refrigerant cycle can be made reversible, which has the effect of simplifying the structure of the refrigerant transport device.

[Brief explanation of drawings]

FIG. 1 is a refrigerant cycle diagram of a heating and cooling system according to an embodiment of the present invention, and FIG. 2 is a diagram of a refrigerant cycle of a conventional heating and cooling system. 3...Heat source side heat exchanger, 8...First auxiliary heat exchanger, 9...Second auxiliary heat exchanger, 11.
... Refrigerant conveyance device, 12 ... User-side heat exchanger, 13a ... No.-th valve, 13b ...
Second valve, 13c...Third valve, 13d...
・Fourth valve.

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 first valve, a refrigerant conveying device, and a second auxiliary heat exchanger. A user-side refrigerant cycle in which a valve and a user-side heat exchanger are connected in an annular manner, a third valve is provided in parallel with the second valve and the refrigerant transfer device, and a fourth valve is provided in parallel with the first valve and the refrigerant transfer device. Air conditioning and heating equipment.