JPH03113242A - Air-conditioning device - Google Patents

Abstract

PURPOSE:To prevent a compressor from being interrupted in its operation upon starting heating operation by providing a heat source side refrigerant cycle and a utilization side refrigerant cycle, and further providing a control device for opening a solenoid valve disposed in parallel to a heating pressure reducing device by pressure detected by a pressure detector device in the heat source side refrigerant cycle. CONSTITUTION:Much gas refrigerant mixes into the inlet side of a refrigerant carrier device 11 upon heating operation to reduce the amount of heat exchange in a second auxiliary heat exchanger 9 is lowered and hence high pressure in a heat source side refrigeration cycle rises. Once the high pressure reaches predetermined pressure, a pressure detector device 14 is actuated to cause a control device 15 to open a solenoid valve 13. Accordingly, the amount of pressure reduction is lowered to acuse the amount of exchanged heat (amount of heat absorption) of a heat source side heat exchanger 3 to be lowered and hence the amount of exchanged heat (amount of heat dissipation) in a first auxiliary heat exchanger 8 to be reduced. Hereby, a compressor is prevented from being interrupted even though capability of the refrigerant carrier device is lowered upon the starting of heating operation.

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 and a user side refrigerant cycle was disclosed in Japanese Patent Application Laid-Open No. 62-2389.
It was disclosed in Japanese Patent No. 51 and was constructed as shown in Figure 2. In Fig. 2, 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 pressure reducing device for cooling, 6 is a pressure reducing device for heating, 6 is a check valve that closes the cooling pressure reducing device 4 during heating, and 7 is a valve that closes the heating pressure reducing device 5 during cooling. check valve consisting of 8
These are connected in an annular manner by a first auxiliary heat exchanger 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. 1o 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 outflow direction of the refrigerant is opposite during cooling and heating, and is housed in the heat source side unit a). 12
is a user-side heat exchanger, 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 shown by the solid line arrow in the figure is used.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 is prevented from returning. It passes through the valve 6, is depressurized by the cooling expansion valve 4, is evaporated in the first auxiliary heat exchanger 8, 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 refrigerant cycle on the user side
The first 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 C' to the second auxiliary heat exchanger 9.

On the other hand, during heating operation, the refrigerant cycle is indicated by the broken line arrow in the figure, and in the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 1 is transferred from the heat source side 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 in the heating pressure reducing device 6, undergoes endothermic evaporation in the heat source side heat exchanger 3, and circulates 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'. The refrigerant is sent to the user-side heat exchanger 12, heated, heat-radiated, liquefied, sent to the refrigerant conveyance device 11 through the connection pipe C, and 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, if the refrigerant conveyance device is operated at the same time as the compressor of the heat source side refrigerant cycle at the start of heating operation, part of the gas refrigerant of the user side refrigerant cycle will be transferred to the refrigerant. This will flow into the equipment and reduce the refrigerant transport capacity. Therefore, the heat exchange capacity of the second auxiliary heat exchanger decreases, the heat exchange capacity of the first auxiliary heat exchanger, that is, the heat dissipation and condensation capacity of the heat source side refrigerant cycle decreases, and the high pressure increases, causing the compressor to operate. There was a risk that it would stop.

In order to solve this problem, a method of controlling the capacity of the compressor has been considered, but this method has the drawbacks of requiring a complicated structure and increasing costs.

In view of the above-mentioned problems, the present invention provides an air-conditioning and heating system that has a simple configuration and that does not cause the compressor to stop operating even if the transport capacity of the refrigerant transport system decreases at the start of heating operation.

Means for Solving the Problems In order to solve the above problems, the air conditioning system of the present invention includes:
A heat source side refrigerant cycle, a user side refrigerant cycle, a solenoid valve provided in parallel with the heating pressure reducing device, a pressure detection device for detecting the pressure of the heat source side refrigerant cycle, and a pressure detected by the pressure detection device to It is equipped with a control device that opens the solenoid valve.

Effects With the above-described configuration, the present invention reduces the capacity of the heat source side refrigerant cycle during the predetermined start time of the heating operation, and the heat exchange heat (heat amount) in the first auxiliary heat exchanger decreases. This means that the pressure can also be lowered.

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. In FIG. 1, reference numeral 13 indicates a solenoid valve installed in parallel with the heating pressure reducing device 6, 14 indicates a pressure detection device for detecting the pressure of the refrigerant cycle on the heat source side, and 16 indicates the pressure detected by the pressure detection device 14. This is a control device that opens the valve. The other parts are the same as those of the conventional example, so the same reference numerals are used here and the explanation will be omitted. Also, the operation of this refrigerant cycle is the same as that of the conventional example described above, so the details are omitted, but during heating operation, a large amount of gas refrigerant mixes into the inlet side of the refrigerant conveying device 11.
Refrigerant transport amount decreases.

At this time, the heat exchange amount in the second auxiliary heat exchanger 9 decreases, and the high pressure of the heat source side refrigerant cycle increases to a predetermined pressure (for example, 23
ky/d), the pressure detection device is activated and the control device 16 opens the solenoid valve 13. Therefore, the amount of pressure reduction decreases, the heat exchanged heat amount (heat absorption amount) of the heat source side heat exchanger 3 decreases, and the heat exchanged heat amount (heat radiation amount) in the first auxiliary heat exchanger 8 decreases, so the high pressure also decreases. can do.

As described above, according to this embodiment, the heat source side refrigerant cycle, the usage side refrigerant cycle, the solenoid valve provided in parallel with the heating pressure reducing device, and the pressure detection device that detects the pressure of the heat source side refrigerant cycle, Since the controller includes a control device that opens the solenoid valve based on the pressure detected by the pressure detection device, even if the capacity of the refrigerant conveyance device decreases at the start of heating operation, the amount of heat exchanged by the heat exchanger on the heat source side ( Since the amount of heat exchanged in the first auxiliary heat exchanger (the amount of heat released) decreases, the high pressure can also be lowered.

Therefore, there is no possibility that the compressor will stop due to a rise in high pressure when starting the heating operation.

Effects of the Invention As described above, the present invention includes a heat source side refrigerant cycle, a usage side refrigerant cycle, a solenoid valve provided in parallel with a heating pressure reducing device, a pressure detection device that detects the pressure of the heat source side refrigerant cycle, The controller is equipped with a control device that opens the electromagnetic valve according to the pressure detected by the pressure detection device, and when heating operation is started, the amount of heat exchanged (the amount of heat absorbed) of the heat exchanger on the heat source side decreases, Since the amount of heat exchanged (heat radiation amount) in the first auxiliary heat exchanger is reduced, the high pressure can also be lowered. Therefore, even if the transfer capacity of the startup refrigerant transfer device decreases, there is no fear that the high pressure in the heat source side refrigerant cycle will increase and the compressor will stop, and stable operation can be achieved.

[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, 3a... Heat source side blower, 8... First auxiliary heat exchanger, 9...
... Second auxiliary heat exchanger, 11 ... Refrigerant conveyance device, 12 ... User side heat exchanger, 13 ...
・Solenoid valve, 14... Pressure detection device, 15...
···Control device.

Claims (1)

[Claims] A heat source side refrigerant cycle formed by connecting a compressor, a four-way valve, a heat source side heat exchanger, a pressure reducing device for cooling, a pressure reducing device for heating, and a first auxiliary heat exchanger in an annular manner, and integrated with this first auxiliary heat exchanger. a user-side refrigerant cycle in which a second auxiliary heat exchanger for heat exchange, a refrigerant transport device, and a user-side heat exchanger are connected in a ring, a solenoid valve provided in parallel with the heating pressure reducing device, and a heat source side. A heating and cooling system comprising: a pressure detection device that detects the pressure of a refrigerant cycle; and a control device that opens the electromagnetic valve based on the pressure detected by the pressure detection device.