JPS5843363A - Refrigerating cycle of air conditioner - 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 The invention relates to a multi-acting compression refrigeration cycle in an air conditioner.

Generally, in a cold leakage cycle called a choyo cycle, the refrigerant at the outlet of the condenser is expanded to an intermediate pressure point, and the gas refrigerant generated at that time is injected into the compressor cylinder during the compression stroke, thereby reducing the refrigeration effect of the refrigeration cycle. Efforts are being made to increase the amount of power required for the compressor and to reduce the power required for the compressor.

FIG. 2 is a system diagram of a conventional refrigeration cycle. During heating operation, refrigerant is compressed by a compressor 1, passes through a four-way valve 2, and is condensed in an indoor heat exchanger 3. Then, the gas refrigerant is partially expanded through the first throttle 4a, and the gas refrigerant generated at this time is separated from the liquid refrigerant in the gas-liquid separator 6.

The liquid refrigerant then flows through the second throttle fi 4b and the check valve 6 to the outdoor heat exchanger 8, where the refrigerant evaporates and is sent to the compressor 1 through the on-off valve 1o and inside the cylinder during the compression stroke. It is squirted.

Also, during cooling operation, as shown by the solid line arrow in the same figure, the small mesh 4!11 #4-way valve 2. The refrigerant passes through the outdoor heat exchanger A (9), the first throttle shift, and the check valve 8, but since the on-off valve 10 is closed during cooling, the refrigerant does not flow into the compression a1.
Passing through check valve 8, indoor heat exchanger 3. Four-way valve 2. Unki, -
It passes through the mulleter 11 and returns to compression-1, and the cycle is repeated.

In such conventional refrigeration cycles, efficiency can be improved by injecting a heating operating medium into the compressor, but changes in indoor and outdoor temperatures may increase the amount of refrigerant circulating during the refrigeration cycle, or cause the compressor to stop or operate. In such a transient state, a situation occurs in which the refrigerant cannot be separated into a gas component and a liquid component in the gas-liquid tea utensil. In this case, when the liquid that cannot improve the efficiency is injected into the compressor 1, the pressure inside the compressor cylinder becomes abnormally high and overcompressed, and when the compressor 1 is in cooling operation again. When the outdoor temperature is low or during the initial stage of operation, liquid refrigerant accumulates in the gas-liquid separator 6, causing the refrigeration cycle to
The misfire IEI solves the above 9 drawbacks of the conventional system, and its purpose is to heat the gas-liquid separator.
The purpose of this system is to increase the gas content of the refrigerant in 11, completely gasify the refrigerant injected into the compressor, and prevent damage to the compressor.

Furthermore, during cooling operation, by heating the gas-liquid separator, the refrigerant in the gas-liquid separator is gasified and gas-liquid separation occurs even when the outside temperature is low or during transient conditions at the beginning of operation. The purpose is to prevent liquid accumulation inside the container, prevent one refrigeration cycle from running out of refrigerant, and allow sufficient cooling capacity to be exhibited.

』ノ、１・°１本发明6、其-'Jりl+j例6、ノJζ'7′ Addi、j1　1　1　ν1 I
Ru. (-5 items are given the same number and the explanation is omitted.

In the figure, compressor 1. Four-way valve 2. Indoor heat exchanger 3.
Pressure reducing device 4a, +b, y, gas-liquid separator 6° check valve 6, 8
．． Outdoor heat exchanger9. Opening/closing valve 10° child key meter 11. The heat pump type freezing cycle consisting of the discharge piping 12 is the same as the second meat, and the discharge piping 1. The two differ only in rotation.

By enclosing the discharge pipe W12 in the gas-liquid separator 6, the refrigerant in the spiracle atmosphere 5 is heated and gasified.

During cooling, the refrigerant discharged from the 1st pressure girder 1 is separated into gas and liquid by passing through the outlet of the discharge pipe enclosed in the gas-liquid separator 6, as shown by the solid arrow. After heating the refrigerant in the container S, the four-way valve 2. Outdoor heat exchanger9. Throttle device 7:, check valve 8. Indoor heat exchanger 3, four-way valve 2. It flows into the compressor 1 through the achievator 11. At this time, the inside of the gas-liquid separator 6 is rr, 1', - cold ν,
1.1. III: Ill ;j Jl /I-+t
'+111111 +l'li If (1)? ;r
1l14IIt(,I-r 7111 pfi!
\J1/, :/rme, t(17 Bay conversion, \J'+, t
There is no f (t), and as a result, the amount of refrigerant circulating in the refrigeration cycle (Jl'l) is always maintained at an appropriate level.

During heating operation, the refrigerant discharged from the compressor 1 by switching the four-way valve 2 passes through the discharge pipe 12 enclosed in the gas-liquid separator 6 as shown by the broken line arrow. As a result, after heating the refrigerant in the gas-liquid separator 6, the four-way valve 2. Indoor heat exchanger 3. It flows into the gas-liquid separator 6 through the first throttle 4a, where the gas-liquid is separated i, the liquid component is collected 4b, and the check valve 6. Outdoor heat exchanger9. Four-way valve 2. Acyu! , rater
11 and returns to compressor 1. R, the gas component is injected into the cylinder during the gas-liquid compression stroke.

At this time, the refrigerant in the gas-liquid separator is heated by the discharged refrigerant, so the gas component of the refrigerant in the gas-liquid separator 5 increases, and the amount of refrigerant circulating in the refrigeration cycle increases due to changes in indoor and outdoor temperatures, etc. , or even in a transient state such as when the compressor 1 is stopped or running, gas-liquid separation is completely performed, and the liquid component is not directly injected into the compressor cylinder.
It has the effect of preventing destruction.

As is clear from the above embodiments, the refrigeration cycle structure of the air conditioner according to the invention includes a gas-liquid separator provided in the in-sequence N path of the refrigeration cycle, and a refrigerant in the gas-liquid separator heated. The heating in the gas-liquid separator increases the gas content of the refrigerant in the gas-liquid separator, resulting in temperature changes. It has various advantages such as the ability to reliably maintain gas-liquid separation power even when the amount of refrigerant circulating increases or in transient conditions such as when the compressor is stopped or running, and the compressor can prevent damage due to liquid compression. It is something to do.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle system diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a refrigeration cycle system diagram of an air conditioner showing a conventional example. 1... Compression rock, 2... Four-way valve, 3...
...Indoor heat exchanger, 4a, 4b, 7...
Pressure reducer, 6... gas-liquid separator, 9... outdoor heat exchanger. Name of agent: Patent attorney Toshio Nakao and one other person...
1. ′、′・：、・、、. Figure 2 311

Claims (1)

[Claims] and an indoor heat exchanger are successively connected to constitute a heat pump type refrigeration cycle, further a gas-liquid separator is provided between the outdoor heat exchanger and the pressure reducing device, and a heating means for heating the gas-liquid separator. Refrigeration cycle of an air conditioner equipped with