Gas-liquid separator, air-conditioning system and control method for preventing liquid return from compressor

Abstract

The invention discloses a gas-liquid separator. The gas-liquid separator comprises a body, an inlet pipe, an outlet pipe, a pressure difference detecting device and a control module, wherein both the pipe orifice of the inlet pipe and the pipe orifice of the outlet pipe are formed in the top of the body, so that after a gas-liquid mixture enters the gas-liquid separator through the inlet pipe, liquid falls at the bottom of the body, and gas is gathered at the top of the body so as to be sucked into a compressor through the outlet pipe; the pressure difference detecting device is used for detecting the pressure difference between the pressure of the liquid at the bottom of the body and the pressure of the gas at the top of the body; and the control module is used for calculating the liquid level in the body according to the pressure difference and judging whether the liquid level reaches a first preset liquid level or not, so that liquid returning of the compressor is prevented. The gas-liquid separator has a liquid level detecting function, and the liquid level in the gas-liquid separator is detected in a simple, effective and economical way, so that liquid returning of the compressor is prevented. The invention further discloses an air-conditioning system and a method for preventing liquid returning of the compressor. The method for preventing liquid returning of the compressor is used for the air-conditioning system.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a gas-liquid separator with a liquid level detection function, an air-conditioning system with the gas-liquid separator, and a control method for preventing compressor liquid return in the air-conditioning system. Background technique [0002] In commercial air conditioners or household air conditioners, in the cooling mode, the high-pressure and high-temperature gas from the compressor is condensed by the outdoor heat exchanger and becomes a high-pressure and normal-temperature liquid, and the high-pressure and normal-temperature liquid becomes a low-pressure and low-temperature gas-liquid mixture after being throttled by the expansion valve. The low-temperature gas-liquid mixture turns into a low-pressure and low-temperature gas after being absorbed by the indoor heat exchanger, and then passes through the gas-liquid separator before the compressor inlet for gas-liquid ...

AI Technical Summary

Problems solved by technology

Especially when the freezer is started and the liquid level in the gas-liquid separator before defrosting is relatively high, the probability of liquid entering the compressor will be higher at this time, which will cause the compressor to return liquid and damage the compressor

And this situation is more dangerous for the multi-connected system where the external unit is on the bottom and the internal unit is on the top.

[0004] At present, the gas-liquid separator basically does not have the function of liquid level detection, and because the liquid level of the gas-liquid separator fluctuates at any time, it is difficult to detect the liquid level simply and effectively by conventional means.

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