What is the role of the vapor liquid separator in the air conditioning and refrigeration system

If the refrigerant (refrigerant) is not fully vaporized in the evaporator, if there is no gas-liquid separator, the liquid refrigerant will enter the compressor directly, causing the compressor to be damaged. (The compressor frequency is high, the pressure difference is large, and it can only press gaseous substances).

Generally, vapor-liquid separators are used in systems with large cooling capacity.

The gas-liquid separator is installed at the inlet end of the compressor, and the main functions are:

Prevent the low-pressure cryogenic vapor returning to the compressor from carrying excessive droplets, prevent the liquid refrigerant from entering the compressor cylinder, and prevent liquid shock to the compressor.

Prevents dilution of compressor oil by excessive refrigerant.

The separator also has the functions of filtration, oil return, liquid storage and so on. Filtering the refrigerant ensures that the gas entering the compressor is clean; The return oil can ensure that the compressor oil is fully lubricated; Liquid storage refers to the part of the refrigerant that is not used in the system, in addition to preventing liquid shock, it can also ensure that there is sufficient refrigerant circulation in the system.

Your question is wrong. The refrigerant of the air conditioner first enters the gas-liquid separator and then enters the compressor.

In the air-conditioning and refrigeration system, the function of the vapor-liquid separator is: during the cooling or pressurization process of saturated gas, a part of the condensable gas components will form small droplets, which flow with the gas. The function of the vapor-liquid separator is to treat the gas containing a small amount of condensate to achieve condensate** or gas phase purification.

Its structure is generally a pressure vessel, and there are related air inlet components and droplet trapping components inside.

The gas-liquid separator cannot be installed at the outlet of the compressor, and the refrigerant must first enter the gas-liquid separator and then enter the compressor.

1. The installation position is different

Gas-liquid separator, installed at the compressor inlet; The reservoir is installed between the condenser outlet and the filter drier.

2. Different roles:

Gas-liquid separator: Prevent the compressor from being damaged by liquid shock caused by liquid refrigerant sucked into the compressor inlet. The basic role of a gas-liquid separator in a heat pump or refrigeration system is to separate and preserve the liquid in the return air duct to prevent compressor liquid shock.

As a result, it can temporarily store excess refrigerant liquid, and it also prevents the oil from diluting the excess refrigerant from flowing into the compressor crankcase.

Because the refrigerated oil is also separated and stored at the bottom during the separation process, there will be an oil hole in the outlet pipe and bottom of the gas-liquid separator to ensure that the refrigerated oil can be returned to compression, thus avoiding the lack of oil in the compressor.

It is mainly divided into vertical, horizontal and with recuperation device, and in some small systems such as refrigerators, some copper pipes will be used to make a simple gas-liquid separator, as shown in the lower right corner of the figure. The working principle of the gas-liquid separator is that when the liquid refrigerant enters the gas-liquid separator, the liquid is separated or hit on a baffle due to the decrease in expansion rate, so as to separate the liquid.

Liquid reservoir: The refrigerant is stored and provided to the evaporator without interruption, so that the refrigerant that has not been completely cooled can be cooled again to reach a liquid state. Many refrigeration equipment is also equipped with an "oil separator" on the outlet of the compressor.

The gas-liquid separator is next to the compressor. His position is located halfway from the evaporator to the compressor. Its role is to preserve excess liquid refrigerant and prevent residual liquid refrigerant from the evaporator from entering the compressor.

The reservoir is of the high-pressure type and is located at the outlet of the condenser. Its function is to allow the refrigerant that has not been completely cooled to cool again to a fully liquid state. And it is generally only used in freezers and compressors for large commercial refrigerators.

The same thing, just put it in a different place, the name has changed.

Generally next to the compressor, on the low-pressure line.

The main function of the gas-liquid separator is to store part of the refrigerant in the system and prevent the compressor from diluting the compressor oil due to excessive liquid shock and refrigerant. The gas-liquid separator should also be able to send enough refrigerant and oil back to the compressor to maintain the operating efficiency of the system and the oil level in the crankcase. When the heat pump is operating in a heated state, the gas-liquid separator should be able to prevent excessive liquid from entering the compressor during and after defrosting and when the ambient temperature leaves the control value of the temperature controller.

When the ambient temperature drops, the gas-liquid separator actually stores some of the liquid refrigerant in the system. Separation of refrigeration oil, liquid refrigerant and gaseous refrigerant in the system. so as not to cause injury to the compressor.

Generally next to the compressor, on the low-pressure pipeline, the function is to separate the refrigeration oil, liquid refrigerant and gaseous refrigerant in the system. so as not to cause injury to the compressor, which is liquid shock.

The gas-liquid separator in the refrigerator refrigeration system is a cylindrical copper tube with a diameter of 6 cm and a length of about 10 cm. It is generally installed behind the evaporator of the refrigerator refrigeration system and in front of the return pipe.

The purpose of setting up the gas-liquid separator in the refrigerator refrigeration system is: if the compressor suction temperature is too low, so that the refrigerant contains a large amount of wet vapor, in order to avoid the compressor inhaling a large amount of wet vapor to produce a "liquid shock" failure, a "gas-liquid separator" should be set between the evaporator and the return pipe of the refrigerator refrigeration system.

The working principle of the gas-liquid separator is: the inertia of the object is used (the gas inertia is small, and it can be bent from the evaporator outlet into the return pipe; The inertia of the liquid is large, so it rushes from the outlet of the evaporator to the lower part of the gas-liquid separator and is stored), separating the gas and liquid of the refrigerant wet vapor flowing out of the evaporator, and does not let the liquid directly enter the return pipe. The separated liquid refrigerant is slowly flowed through the small hole throttle into the return air duct and back to the compressor.

This avoids the occurrence of "liquid shock" due to the large amount of wet steam returning to the compressor in the refrigeration system.

1. Evaporator: evaporate the throttled low-pressure refrigerant in the evaporator. The evaporation process is endothermic.

2. Condenser: The high-temperature and high-pressure liquid discharged by the compressor is condensed in the condenser, and the heat is dissipated to the outdoors at the same time.

When the refrigeration system is in operation, some air and other non-condensable gases accumulate in the condenser and high-pressure reservoir. These gas mixtures not only hinder the heat transfer efficiency of the condenser, but also increase the energy consumption of the compressor. The air separator is to condense the ammonia in the mixed gas into ammonia liquid through cooling, and separate the air from the non-condensable gas.

There are two types of air separators commonly used in cold storage, namely casing air separators and vertical air separators.

If there is no gas-liquid separator, the refrigerant will be brought to the evaporator and pipeline, affecting the heat exchange, and under some conditions, the four-way valve and electronic expansion valve may be blocked.

Therefore, the gas-liquid separator mainly allows the gaseous refrigerant to continue to circulate in the system, so that the excess liquid refrigerator and refrigeration oil are stored in it.

Hope it helps.

The air-liquid separator of the air conditioner is installed in the steamer.