JP3019995B2 - Refrigeration cycle - Google Patents

Description

[Detailed Description of the Invention] (Object of the Invention) (Industrial application field) The present invention relates to a refrigeration cycle which can select a cooling / heating capacity ratio according to a market load.

(Prior Art) Generally, as shown in FIG. 3, a heat pump type refrigeration cycle applied to an air conditioner has a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a decompression device 4, an indoor heat exchange. In the cooling operation, the refrigerant flows in the direction shown by the solid line, and blows the cold air heat exchanged by the indoor heat exchanger 5 into the room, During the heating operation, by switching the four-way valve 2, the refrigerant flows in the direction indicated by the dotted line, and the warm air that has been heat-exchanged by the indoor heat exchanger 5 is blown into the room.

(Problems to be Solved by the Invention) In the heat pump type refrigeration cycle, the heating operation and the cooling operation are switched by switching the four-way valve. However, under the climatic conditions in Japan, the heating capacity is about 1.8 with respect to the cooling capacity 1; If the capacity is set based on the heating operation, the on-off operation is repeated during the cooling operation due to excessive capacity, and an appropriate operation cannot be performed.

In addition, the operating condition during cooling is higher than the operating condition during heating, so the operating pressure of the refrigerant (R22) increases, the load on the compressor increases, and a large-capacity drive motor is required. As the size increases, the efficiency during heating decreases.

In view of this, there has been proposed a technical means for connecting the four-way valve and the indoor heat exchanger and the return side of the compressor with a bypass to eliminate the above-mentioned difficulties.In this case, however, the intermediate pressure and the discharge pressure of the compressor are reduced. Due to the pressure difference described above, chattering occurs in the valve provided in the bypass passage.

The present invention has been made in view of the above points, and an object of the present invention is to provide a refrigeration cycle capable of increasing operating efficiency and selecting a cooling / heating capacity ratio according to a market load.

[Configuration of the invention]

(Means for Solving the Problems) A refrigeration cycle according to the present invention comprises a compressor, a four-way valve, an indoor heat exchanger, a decompression device, and an outdoor heat exchanger which are sequentially connected by a refrigerant pipe, and a refrigerant having a smaller diameter than the refrigerant pipe. A bypass path composed of pipes is provided so as to branch from the refrigerant pipe between the discharge side of the compressor and the four-way valve and to be connected to the refrigerant pipe between the four-way valve and the indoor heat exchanger, during the heating operation and the cooling operation. A part of the refrigerant from the compressor is supplied to a refrigerant pipe between the four-way valve and the indoor heat exchanger, so that a difference in performance between a heating operation and a cooling operation is adjusted.

(Operation) In the refrigeration cycle of the present invention, during the heating operation,
Most of the refrigerant discharged from the compressor is sent to the indoor heat exchanger through the four-way valve, and part of the refrigerant is sent to the indoor heat exchanger through the bypass path, so that heat exchange efficiency hardly decreases, During the cooling operation, most of the refrigerant discharged from the compressor is sent to the outdoor heat exchanger through the four-way valve, and a part of the refrigerant is sent to the outlet side of the outdoor heat exchanger through the bypass path. , The amount of gas discharged from the compressor is reduced by the return amount. Therefore, by selecting the diameter of the bypass passage, the cooling / heating capacity ratio can be set according to the market load.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the same members as those in FIG. 3 are denoted by the same reference numerals.

In FIG. 1, reference numeral 10 denotes a bypass which is incorporated in a refrigeration cycle of the air conditioner. The diameter of a pipe constituting the bypass 10 is set smaller than the diameter of the refrigerant pipe 6. The pipe diameter of the bypass passage 10 is selected according to the diameter of the refrigerant pipe 6 in order to set the cooling / heating capacity ratio according to the market load. The above bypass 10
Is disposed so as to connect the discharge side 1a of the compressor 1, the indoor heat exchanger 5, and the space 11 between the four-way valves 2.

That is, as shown in FIG. 2, the bypass passage 10 is connected to a T-shaped processing portion 12 provided at a portion of the pipe 6 connected to the four-way valve 2 which is located on the discharge side 1a of the compressor 1 and the indoor heat exchange. It connects a T-shaped part 13 provided at a portion located between the vessel 5 and the four-way valve 2.

 Next, the operation will be described.

During the heating operation, most of the refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 5 through the four-way valve 2, and a part of the refrigerant passes through the bypass 10 and passes through the four-way valve 2. Since the heat is sent to the indoor heat exchanger 5, the heat exchange efficiency of the indoor heat exchanger 5 is hardly reduced.

During the cooling operation, most of the refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 3 via the four-way valve 2, and a part of the refrigerant passes through the bypass 10 and the indoor heat exchanger 5 Is sent to the compressor 1 via the four-way valve 2 and the amount of gas discharged from the compressor 1 is reduced by the return amount. Therefore, by selecting the diameter of the bypass passage 10, the market load is reduced. Is set in accordance with the cooling / heating capacity ratio.

In addition, by bypassing the gas discharged from the compressor 1, the effective capacity during the cooling operation is reduced, so that the amount of heat released from the outdoor heat exchanger 3 and the amount of heat absorbed from the indoor heat exchanger 5 are reduced, and The temperature difference between the outside air (35 ° C) and the indoor air (21 ° C) in winter is offset, the compression load in summer and winter is made uniform, and there is no need to use a large-capacity drive motor in summer.

In the above-described embodiment, an example in which the refrigeration cycle is applied to an air conditioner has been described. However, the refrigeration cycle can be used in other fields as long as the same effect can be obtained.

〔The invention's effect〕

As described above, according to the present invention, in a refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, an indoor heat exchanger, a decompression device, and an outdoor heat exchanger are sequentially connected by a refrigerant pipe, a refrigerant pipe having a smaller diameter than the refrigerant pipe is used. The bypass path that is configured branches off from the refrigerant pipe between the compressor discharge side and the four-way valve, and is connected to the refrigerant pipe between the four-way valve and the indoor heat exchanger, thereby simplifying the configuration and enabling the market The cooling / heating capacity ratio can be selected according to the load, and the size of the drive motor incorporated in the compressor can be reduced, so that the operating efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing a refrigeration cycle of the present invention, FIG. 2 is a view showing a four-way valve portion of the refrigeration cycle, and FIG. 3 is a view showing a conventional heat pump type refrigeration cycle. 1 Compressor, 1a Compressor 1 discharge side,
2 ... 4 way valve, 6 ... refrigerant pipe, 10 ... bypass path. 11
... Position of the refrigerant pipe between the indoor heat exchanger and the four-way valve.

Claims (1)

(57) [Claims] In a refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger are sequentially connected by refrigerant piping, the refrigerant branches off from the refrigerant piping between the compressor discharge side and the four-way valve. A bypass path connected to the refrigerant pipe between the valve and the indoor heat exchanger is provided. A refrigeration cycle characterized in that a part is supplied to a refrigerant pipe between the four-way valve and the indoor heat exchanger.