Technical realization elements of gas-liquid separation system

Technical realization elements:

4. In order to solve the above-mentioned problems in the prior art, the present invention provides a gas-liquid separation system with sufficient oil return, which can avoid liquid hammer and compressor burnout, and ensure the safety and reliability of compressor operation.

5. The present invention adopts the following technical solutions:

6. A gas-liquid separation system, including a compressor, a condenser, a first throttling device, an evaporator, and a gas-liquid separator;

7. The compressor, the condenser, the first throttling device, the evaporator and the gas-liquid separator are connected in sequence;

8. The gas-liquid separator includes a container body, a fluid inlet pipe for inputting gas-liquid mixed fluid into the container body, a gas outlet pipe for conveying gas from the container body and A fluid outlet pipe for conveying liquid outward in the container body; the fluid inlet pipe is connected to the evaporator, the gas outlet pipe is connected to the air return port of the compressor, and the fluid outlet pipe is connected to the air return port of the compressor , The fluid outlet pipe can be switched between being connected and closed, the fluid outlet pipe is also connected with a heating part, and the heating part can be switched between a heating state and a non-heating state;

9. At the initial startup, the fluid outlet pipe is switched to a closed state, and the heating part is in a non-heating state;

10. During the working process, the fluid outlet pipe is switched to a connected state, and the heating part is in a heating state or a non-heating state according to the degree of superheat in the container body.

11. As a further improvement of the technical solution of the present invention, the fluid inlet pipe is arranged at the upper end of the container body, the inlet of the fluid inlet pipe is arranged outside the container body; the outlet of the fluid inlet pipe extends to the Inside the container

12. The gas outlet pipe is arranged at the upper end of the container body, the outlet of the gas outlet pipe is arranged outside the container body, and the inlet of the gas outlet pipe extends into the container body;

13. The inlet of the fluid outlet pipe is arranged at the bottom of the container body and communicates with the container body, and the outlet of the fluid outlet pipe is located outside the container body.

14. As a further improvement of the technical solution of the present invention, the fluid inlet pipe is in an l-shape, and the outlet of the fluid inlet pipe is located at the lateral end of the l-shape.

15. As a further improvement of the technical solution of the present invention, the outlet of the fluid inlet pipe is away from the inlet of the gas outlet pipe.

16. As a further improvement of the technical solution of the present invention, the gas outlet tube is i-shaped, the longitudinal length of the gas outlet tube extending into the container body and the longitudinal length of the fluid inlet tube extending into the container body The length is equal or approximately equal.

17. As a further improvement of the technical solution of the present invention, the container body includes an upper cylinder and a lower cylinder that are sealed and spliced and fixed, the fluid inlet pipe and the gas outlet pipe are both arranged on the upper cylinder, so The fluid outlet pipe is arranged on the lower cylinder.

18. As a further improvement of the technical solution of the present invention, a first branch pipe and a second branch pipe are provided between the fluid outlet pipe and the air return port of the compressor;

19. Both ends of the first branch pipe are respectively connected to the fluid outlet pipe and the air return port of the compressor, and a first valve is provided on the first branch pipe;

20. Two ends of the second branch pipe are respectively connected to the fluid outlet pipe and the air return port of the compressor, and the second branch pipe is provided with a second valve and the heating part;

21. At the initial startup, the first valve and the second valve are closed, and the heating part is in a non-heating state;

22. During operation, when the degree of superheat in the container body is greater than 0, the first valve is opened, the second valve is closed, and the heating part is in a non-heating state; when the temperature in the container body is When the degree of superheat is less than 0, the first valve is closed, the second valve is opened, and the heating part is in a heating state.

23. As a further improvement of the technical solution of the present invention, the heating part is a heat regenerator, and the connecting pipeline between the condenser and the first throttling device passes through the heat regenerator.

24. As a further improvement of the technical solution of the present invention, the heating part is a regenerator, and a third branch pipe and a fourth branch pipe are provided between the condenser and the first throttling device;

25. The connecting pipe between the fluid outlet pipe and the air return port of the compressor passes through the regenerator, and a third valve is provided between the fluid outlet pipe and the regenerator;

26. Both ends of the third branch pipe are connected to the condenser and the first throttling device, and the third branch pipe is provided with a second throttling device;

27. Both ends of the fourth branch pipe are respectively connected to the condenser and the first throttling device and the fourth branch pipe passes through the regenerator, and the fourth branch pipe is in front of the regenerator Equipped with a third throttling device;

28. At the initial startup, the third valve is closed, the first throttling device and the second throttling device are opened, and the third throttling device is closed;

29. During operation, when the degree of superheat in the container body is greater than 0, the third valve opens, the first throttling device and the second throttling device are opened, and the third throttling device is closed; when the The degree of superheat in the container body is less than 0, the third valve is opened, the first throttling device and the third throttling device are opened, and the second throttling device is closed.

30. As a further improvement of the technical solution of the present invention, the opening degree of the first throttling device and/or the second throttling device and/or the third throttling device is adjustable.

31. Compared with the prior art, the beneficial effects of the present invention are:

32. In the gas-liquid separation system of the present invention, the gas-liquid separation is set into three ports, the fluid inlet pipe is used to input refrigerant (liquid and/or gas) and lubricating oil, and the fluid outlet pipe is used to discharge lubricating oil and liquid refrigeration. The gas outlet pipe is used to discharge gaseous refrigerant; because the fluid outlet pipe can be switched on and off, when the compressor is turned on and running, the compressor can be lubricated only by the oil inside the compressor, and the fluid outlet can be turned off at this time. Pipe, do not deliver lubricating oil to the compressor, and at the same time prevent the liquid refrigerant in the container body from entering the compressor to cause liquid shock, thereby protecting the compressor; during operation, when the internal superheat of the gas-liquid separator is greater than 0, the gas If there is no liquid refrigerant in the liquid separator, the fluid outlet pipe can be opened at this time, and the heating part

It is in a non{{0}}heating state and does not supply heat. The lubricant is delivered to the compressor through the fluid outlet pipe to ensure the oil return of the compressor; during operation, when the internal superheat of the gas-liquid separator is less than 0, the gas-liquid separation There is liquid refrigerant inside the device, the heating part is in heating state and the fluid outlet pipe is opened, so that the liquid refrigerant inside the gas-liquid separator evaporates into gaseous state through the heating part, preventing the compressor from returning liquid and ensuring the oil return. Since the fluid outlet pipe remains connected during operation, only the state of the heating part is changed, so that the fluid outlet pipe can continuously deliver lubricating oil to the compressor to ensure the oil return of the compressor. At the same time, according to the amount of superheat, With the help of the heating section, the liquid refrigerant discharged from the fluid outlet pipe can evaporate into a gaseous state and then enter the compressor to avoid liquid hammer. Due to the presence of the heating section, even if there is more liquid refrigerant accumulated in the container body It will not cause liquid shock to the compressor, thereby avoiding the compressor from burning and ensuring the safety and reliability of the compressor operation.

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