JPH03211364A - refrigeration cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a refrigeration cycle using a mixed refrigerant.

[Conventional technology]

FIG. 3 is a known technique described in Japanese Unexamined Patent Publication No. 62-237252.

The above-mentioned known technology heats the mixed refrigerant discharged from the compressor 20 and enters the separator 35 with the heater 32 in order to store the low-boiling point refrigerant in the reservoir 31 in the refrigeration cycle. The generated low boiling point refrigerant is cooled and liquefied, and stored in the reservoir 3.
1, a part of the mixed refrigerant discharged from the indoor heat exchanger 22 or the outdoor heat exchanger 23 is transferred to the expansion valve 24 or .

This is a refrigeration cycle in which the pressure is lowered at 26 and cooled at a cooler 25.

[Problem to be solved by the invention]

The above conventional technology stores a low boiling point refrigerant in a reservoir within a refrigeration cycle.

An object of the present invention is to provide a refrigeration cycle in which a high boiling point refrigerant is stored in a storage section of a separation device within the refrigeration cycle.

[Means to solve the problem]

In order to achieve the above object, in one aspect of the present invention, the storage section of the separator is heated with a mixed refrigerant from the condenser outlet.

Furthermore, the low boiling point refrigerant generated in the separator was returned to the low pressure side of the refrigeration cycle.

[Effect]

With this configuration, the low boiling point refrigerant can be stored in the storage section of the separator, and the composition of the mixed refrigerant in the main circuit can be changed according to the purpose of use.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 and 2. 6 The separation of the mixed refrigerant shown in FIG. 1 will be explained.

The mixed refrigerant made high temperature and high pressure by the compressor 1 passes through the four-way valve 2 and is transferred to the outdoor heat exchanger 5. Alternatively, it is condensed into a liquid in the indoor heat exchanger 4, passes through the rectifier 6, and branches into two directions. One side adjusts the flow rate with the capillary tube 8 and enters the upper part of the separation device 17.

The other branched from the rectifier 6 passes through a two-way valve 9 and a heater 16, and becomes low pressure at the expansion valve 12.The separator 17 has a mixed refrigerant flowing down from the upper part, whose flow rate is adjusted by a capillary tube 8, and On the other hand, the mixed refrigerant accumulated in the storage section at the lower part of the separator 17 is heated by the heater 16 to evaporate the low boiling point refrigerant. Then, by bringing the flowing down mixed refrigerant and the rising low boiling point refrigerant into contact with each other via the filling 18, heat and substances are transferred and the mixed refrigerant is separated.

At this time, the overflow of the liquid level in the separator 17 and the storage section is returned to the low pressure side through the pipe 15 to adjust the liquid level. Also,
Since oil may also accumulate together with the high boiling point refrigerant in the lower reservoir of the separation device 17, the oil is circulated by passing through the capillary tube 14 and returning to the low pressure side.

The low boiling point gas refrigerant discharged from the upper part of the separator 17 is composed of an overflow portion of the storage section of the separator 17 which passes through the capillary tube 10 and comes out from the plumber 5, and a high boiling point refrigerant containing oil which comes out from the capillary tube 14. , passes through two-way valve 13, and continues.

It passes through the expansion valve 12, joins with the low-pressure mixed refrigerant, passes through the rectifier 6, and enters the indoor heat exchanger 4. Or, it is evaporated in the outdoor heat exchanger 5, passes through the four-way valve 2 and the accumulator 3,
It constitutes a refrigeration cycle that is sucked into the compressor.

Next, the time of mixing the mixed refrigerant will be explained.

The operation of the main circuit is the same as that of the refrigeration cycle, so only the differences will be explained.

The condensed high-pressure mixed refrigerant passes through the rectifier 6 and is branched into two directions, one of which closes the two-way valve 9 and flows only into the other direction. At this time, open the two-way valve 7 that bypasses the capillary tube. Enters the separation device 17, exits from the bottom,
It passes through the check valve 11, becomes low pressure at the expansion valve 12, and enters the rectifier. At this time, the two-way valve 13 is closed to form a refrigeration cycle that prevents the fluid from flowing to the lower pressure side from the separator 17.

The main circuit of the refrigeration cycle shown in FIG. 2 is the same as the refrigeration cycle shown in FIG. 1, so only the differences will be explained.

First, the separation of the mixed refrigerant will be explained.

The high-pressure mixed refrigerant coming out of the rectifier 6 branches into three directions, but one of them closes the two-way valve 9, so it flows only in two directions.

One side passes through the two-way valve 7, the flow rate is adjusted with a capillary tube 8, and enters the separation device 17.
At 2, the pressure is low.

The low boiling point refrigerant coming out from the upper part of the separation device 17 passes through the capillary tube 10 and comes out from the piping 15 to the separation device 17.
The overflow of the reservoir and the capillary tube 1
It joins with the high boiling point refrigerant containing oil coming out from check valve 1.
9, further passes through the expansion valve 12, joins with the low-pressure mixed refrigerant, and enters the rectifier 6, forming a refrigeration cycle.Next, the mixing of the mixed refrigerant will be described.

The high-pressure refrigerant gas that comes out of the rectifier 6 branches into three directions, but since the two-way valves 7 and 11 are closed, only one direction flows 6. The flow direction is through the two-way valve 9 and the reservoir, and then to the expansion valve. 12
The pressure becomes low and enters the rectifier 6. At this time, the separation device 17
A refrigeration cycle is constructed in which no flow occurs because the flow is via the check valve 19.

The rectifier 6 will be explained.

The rectifying device 6 shown in FIGS. 1 and 2 is a combination of four check valves. When the high-pressure mixed refrigerant flows from the indoor heat exchanger 4, only one direction is determined and it flows into the separation device 17. The mixed refrigerant that has become low pressure at the expansion valve 12 is transferred to the rectifier 6.
It enters and flows. There are two directions, but since one is at high pressure, only one flow direction is determined, and it flows into the outdoor heat exchanger 5.

When a high-pressure mixed refrigerant flows from the outdoor heat exchanger 5, the same operation as described above is performed, the direction in which the mixed refrigerant flows is determined, and it can always flow into the separation device 17 from the same direction.

〔Effect of the invention〕

According to the present invention, the start-up during the winter heating start-up movement is quick, and the oil return to the compressor is reliably performed.

[Brief explanation of drawings]

1 and 2 are system diagrams of an embodiment of the refrigeration cycle of the present invention, and FIG. 3 is a system diagram of a conventional example. 1. Compressor, 4. Indoor heat exchanger, 5. Outdoor heat exchanger, 6. Rectifier, 12. Expansion valve, 16. Heater. Figure g, IO, Atsushi 1 latch yuf

Claims (1)

[Claims] 1. A main circuit connecting each element of a compressor, a condenser, a throttle device, and an evaporator is filled with a plurality of refrigerants, and a refrigerant separation device is provided for changing the composition of the refrigerants. A refrigeration cycle, characterized in that a flow direction of the refrigerant to the refrigerant separator becomes constant by using a rectifier to connect the main circuit and the refrigerant separator.