JPS61237973A - 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 [Field of Application of the Invention] The present invention relates to a refrigeration cycle, and particularly to a cycle configuration that prevents liquid from returning to a compressor.

[Background of the invention]

As a method of preventing liquid refrigerant from returning to the compressor, for example, as shown in Japanese Patent Application Laid-Open No. 59-219678, the accumulated amount of liquid refrigerant is detected with a liquid level detector installed in the accumulator body, and the amount of liquid refrigerant is detected at the bottom. The liquid refrigerant is atomized by driving the built-in micro-vibration generator and sucked into the compressor, thereby preventing the liquid from returning to the compressor. This led to an increase in the price of installing the equipment (this point was not taken into consideration).

[Purpose of the invention]

An object of the present invention is to provide a refrigeration cycle that prevents liquid from returning from the accumulator to the compressor using a simple refrigeration cycle configuration.

[Summary of the invention]

In order to achieve this object, the present invention actively heats and evaporates the low-temperature, low-pressure liquid refrigerant accumulated in the accumulator by exchanging heat with the high-pressure liquid refrigerant discharged from the condenser, and the high-pressure liquid This increases the supercooling of the refrigerant to increase the refrigeration capacity of the refrigeration cycle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a diagram of a refrigeration cycle for a heat pump air conditioner equipped with an embodiment of the present invention. A compressor 1 has a four-way valve 2 at its discharge port, and an indoor heat exchanger 3 and an outdoor heat exchanger 4 are connected to the four-way valve 2, and each heat exchanger has check valves 5 and 6, respectively. and pressure reducing mechanisms 7 and 8 are connected in parallel and connected by a high-pressure liquid refrigerant pipe 9, and the high-pressure liquid refrigerant pipe 9 can exchange heat with an Akiem generator 10 provided between the four-way valve 2 and the compressor 1. It is arranged like this.

In the refrigeration cycle configured as described above, when the four-way valve 2 is set to the solid line position during heating operation, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 enters the indoor heat exchanger 3, releases latent heat of condensation, and circulates indoors. While heating, it becomes a high-pressure liquid refrigerant, passes through the check valve 5, exchanges heat with the Akiemulator in the high-pressure liquid refrigerant pipe 9, passes through the pressure reduction mechanism 8, becomes a low-temperature, low-pressure liquid refrigerant, and evaporates from the outside air by the outdoor heat exchanger 4. It absorbs latent heat and becomes a low-pressure gas refrigerant, which passes through the four-way valve 2 and the accumulator 10 and is sucked into the compressor 1. During cooling, by setting the four-way valve 2 to the position indicated by the broken line, the refrigerant is condensed in the outdoor heat exchanger 4,
The indoor heat exchanger 3 vaporizes the refrigerant to cool the room. In a refrigeration cycle that operates as described above, as shown in FIG.
When the high-pressure liquid refrigerant pipe 9 is brought into contact with the heat exchanger for heat exchange, if the low-temperature, low-pressure liquid refrigerant 11 accumulated in the accumulator due to fluctuations in the amount of refrigerant required due to changes in operating conditions, etc., the high-pressure liquid refrigerant pipe 9
The amount of accumulated refrigerant 11 can be reduced by heating and evaporating the accumulated refrigerant 11 with the refrigerant flowing inside the compressor 1 from the outlet pipe 12.
It is possible to prevent liquid from returning to the tank. Concomitantly, the high-pressure liquid refrigerant is cooled by the low-temperature, low-pressure accumulated liquid refrigerant in the accumulator 10, promoting supercooling and increasing the refrigerating capacity.

〔Effect of the invention〕

As is clear from the above embodiments, according to the present invention, by bringing the high pressure liquid refrigerant pipe 9 through which the condensed high pressure liquid refrigerant flows into thermal contact with the accumulator 10, the low temperature and low pressure accumulated in the accumulator 10 is The liquid refrigerant exchanges heat with the high-pressure liquid refrigerant, and the accumulated liquid refrigerant is heated and evaporated, reducing the accumulated amount and preventing the liquid from returning from the π accumulator to the compressor. This method has the advantage of promoting supercooling and increasing the refrigerating capacity through a simple refrigerating cycle configuration.

Although the embodiments of the present invention have been described with respect to the refrigeration cycle of a heat pump air conditioner, it goes without saying that similar effects can be obtained with other refrigeration cycles in which the direction of refrigerant flow is fixed.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle of a heat pump air conditioner equipped with an embodiment of the present invention, and FIG. 2 is a sectional view of an accumulator according to an embodiment of the present invention. 1... Compressor, 2... Four-way valve, 3... Indoor heat exchanger, 4... Outdoor heat exchanger, 5.6... Check valve,
7.8... Pressure reduction mechanism, 9... High pressure liquid refrigerant pipe, 10.
··accumulator. Figure 1 Figure Z

Claims (1)

[Claims] 1. The accumulator disposed between the evaporator and the compressor is in thermal contact with a high-pressure liquid refrigerant pipe connecting the condenser outlet and the pressure reduction mechanism. Refrigeration cycle. 2. The refrigeration cycle according to claim 1, wherein a high-pressure liquid refrigerant pipe is fixed to the lower part of the outer periphery of the accumulator.