JPH0379964A - Air conditioning apparatus - Google Patents

Abstract

PURPOSE:To permit a multistage control of the capacity of a unit on the service side and prevent the lowering of the capacity due to the occurrence of bypassed refrigerant stream in a refrigerant supply device in cessation by a method wherein a plurality of refrigerant supply devices are provided parallel to each other in a refrigerant cycle on the service side and each refrigerant supply device is provided with a reverse flow check valve in series therewith. CONSTITUTION:Refrigerant supply devices 12a and 12b are provided parallel to each other and reverse flow check valves 14a and 14b are provided in series therewith, respectively. By controlling the number of the refrigerant supply devices 12a and 12b according to the load on a unit (b) on the service side, refrigerant supply capacity is regulated and by controlling the amount of the refrigerant under circulation in a refrigerant cycle on the service side, heat exchange capacity between a second auxiliary heat exchanger 9 and a heat exchange 13 on the service side is regulated, thereby controlling the capacity of the refrigerant cycle on the service side. A multistage control can be made of the amount of the circulating refrigerant in the refrigerant cycle on the the service side and, in the case of fewer operating units, the unit in cessation can by bypassed to prevent the lowering of the capacity.

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. 52 and was constructed as shown in FIG. In Fig. 2, 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 cooling pressure reducing device, 6 is a heating pressure reducing device, and 6 is a cooling pressure reducing device 4 that is closed during heating. 7 is a check valve that closes the pressure reducing device 6 for heating during cooling;
Reference numeral 8 denotes a first auxiliary heat exchanger, which is 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. 1o is a refrigerant amount adjustment tank that adjusts the amount of refrigerant during cooling and heating.

Reference numeral 11 is a four-way valve, and reference numeral 12 is a refrigerant conveying device so that the flow direction of the refrigerant is the same in the four-way valve 11 during cooling and heating.These are stored in the heat source side unit a. . Reference numeral 13 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 1
o, the refrigerant conveying device 12, the user-side heat exchanger 13, and the connecting pipes c and a' 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 arrow in the figure is used.In the heat source side refrigerant cycle, high temperature, high pressure gas from the compressor 1 passes through the four-way valve 2, radiates heat in the heat source side heat exchanger 3, condenses and liquefies, and reverses the cycle. It passes through the stop 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 conveying device 12 through the refrigerant amount adjustment tank 1o and the four-way valve 11. The refrigerant is sent by the refrigerant conveying device 12 to the user-side heat exchanger 13 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. Become.

On the other hand, during heating operation >h, the refrigerant cycle shown by the dashed arrow in the figure is activated, 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 with the heating pressure reducing device 6, absorbs heat and evaporates 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, and is used through the connecting pipe c15. It is sent to the side heat exchanger 13, heated and liquefied, and passes through the connecting pipe 0 to the four-way valve 11. The refrigerant is sent to the refrigerant transport device 12 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 capacity of the refrigerant transport device of the user-side refrigerant cycle is constant, and even if the load on the user-side unit changes, the capacity of the user-side unit does not change. ,
Eventually, the shutdown of one unit on the heat source side would be reversed. Therefore, the temperature fluctuation in the air-conditioned room increases, which is uncomfortable, and the efficiency decreases.

In order to solve this problem, it may be possible to make the compressor or refrigerant conveying device of a capacity control type, but this has the problem of increasing costs.

In view of the above-mentioned problems, the present invention provides an air-conditioning and heating system in which the capacity of a user unit can be controlled in multiple stages using a simple method, and a decrease in capacity due to the generation of a bypass refrigerant flow in a stopped refrigerant conveying device can be prevented. be.

Means for Solving the Problems In order to solve the above-mentioned problems, the air conditioning system of the present invention includes a plurality of refrigerant transport devices arranged in parallel in the user-side refrigerant cycle, and a backflow prevention valve connected in series to each of the four refrigerant transport devices. It was established.

Effect of the Invention With the above-described configuration, the present invention can control the refrigerant circulation amount of the user-side refrigerant cycle in multiple stages by controlling the number of a plurality of refrigerant conveying devices. /(You can prevent your ability from deteriorating due to misunderstandings.

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 numerals 12a and 12b are refrigerant conveying devices, which are installed in parallel. Further, 14a and 14b are check valves, which are provided in series with each refrigerant conveying device. 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 refrigerant cycle of the housing is also the same as that of the conventional example, and although the details are omitted, the refrigerant conveying devices 12a, 12
The transfer capacity is controlled by controlling the number of units b, and the heat exchange capacity of the second auxiliary heat exchanger 9 and the use side heat exchanger 13 is controlled by controlling the refrigerant circulation amount of the use side refrigerant cycle. This controls the capacity of the side refrigerant cycle. For example, if the capacity (cylinder volume) of the refrigerant conveyance device is
CC/rev, 8 CC/rev = 5
During independent operation of CC/rev, a backflow prevention valve is provided in series with the 8CC/rev refrigerant conveyance device, and there is no backflow bypass, so a capacity of 5 CC/r eV is obtained.

BC! :, 8 CC/ in the same way when /r@V is operated alone.
rev ability is obtained.

Therefore, the combination of capacities is 5 cC/rev,
8CC/rev, 13CL/rev, 3 stages of capacity control.

In addition, the capacity of the heat source side refrigerant cycle is balanced with the capacity of the user side refrigerant cycle because the heat exchange capacity of the first auxiliary heat exchanger 8 is controlled by the heat exchange capacity of the second auxiliary heat exchanger 9. Become.

As described above, according to this embodiment, backflow bypass can be prevented by installing refrigerant conveying devices having serially connected refrigerant valves in parallel and controlling the number of units. Since it can be the ability,
The temperature of the air-conditioned room is stabilized and comfort is improved, and the number of shutdowns of the heat source unit is reduced, which increases efficiency and contributes to energy savings.

In addition, even if the number of units in operation is small and the pressure load is high due to long piping, no backflow bypass will occur in the stopped unit.
This will prevent you from becoming incompetent.

Effects of the Invention As described above, the present invention provides a plurality of refrigerant transfer devices in parallel with each other, each having a check valve in series in the user refrigerant cycle, and controls the number of units. Since the capacity of the user-side refrigerant cycle (refrigerant circulation amount) can be adjusted to match the load, the temperature of the air-conditioned room is stabilized and comfort is improved, and the number of shutdowns of the heat source unit is reduced. This has the effect of improving efficiency.

In addition, even if the number of units in operation is small and the pressure loss is large due to long piping, etc., and the pressure load on the refrigerant conveying device becomes large, bypass does not occur and the necessary capacity can be obtained.

[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, 1a,
1b... Refrigerant conveying device with different capacity, 1...
... Utilization side heat exchanger, 14a, 14b... Backflow prevention valve.

Claims (1)

[Claims] A heat source side refrigerant cycle formed by connecting a compressor, a heat source side four-way valve, a heat source side heat exchanger, a source pressure device, and a first auxiliary heat exchanger in an annular manner, and the first auxiliary heat exchanger are integrally formed, It consists of a second auxiliary heat exchanger for heat exchange, a plurality of refrigerant transport devices, and a user-side refrigerant cycle in which a plurality of refrigerant transport devices and a user-side heat exchanger are connected in a ring, and the plurality of refrigerant transport devices are connected in parallel and each A heating and cooling device characterized in that a backflow prevention valve is provided in series with a refrigerant conveyance device.