Screw compressor having oil separator and water chilling unit

1. A screw compressor having an oil separator, said screw compressor comprising:

a compressor housing with an inlet for a refrigerant gas flow to flow in;

an oil separator housing connected to the compressor housing in a fastened and sealed manner and having an outlet for the refrigerant gas flow to flow out;

a compressing assembly disposed within the compressor housing and close to the inlet for compressing the refrigerant gas flow;

an electric motor for driving the compressing assembly;

wherein the screw compressor further comprises an oil separator, the oil separator is disposed within the oil separator housing and comprises a first separator for first separation of a freezing oil and a second separator for second separation of the freezing oil, wherein the second separator is disposed close to the outlet, and the first separator is disposed between the compressing assembly and the second separator;

wherein the first separator comprises a cyclone separator configured to rotate a mixture of refrigerant and oil around a guide plate inside the oil separator housing;

wherein the second separator comprises a filter-type oil separator.

2. The screw compressor according to claim 1 , wherein an oil tank is provided at the bottom of the compressor housing, and the oil tank is disposed underneath the compressing assembly and the electric motor, and spaced apart from the compressing assembly and the electric motor.

3. The screw compressor according to claim 2 , wherein the oil tank is configured to extend to be underneath the first separator and the second separator, and is spaced apart from the first separator and the second separator.

4. The screw compressor according to claim 1 , wherein the second separator includes a filtration component made of a metal wire net or woven by glass fibers.

5. The screw compressor according to claim 1 , wherein the guide plate is trumpet-shaped.

6. The screw compressor according to claim 1 , wherein the inlet of the compressor housing and the outlet of the oil separator housing are on the same axis.

7. The screw compressor according to claim 2 , wherein a chamber between the first separator and the second separator leads to the oil tank.

8. The screw compressor according to claim 5 , wherein the guide plates of the first separator and the second separator are fixed to an inner sidewall of the oil separator housing by means of bolts or welding.

9. The screw compressor according to claim 5 , wherein a flaring structure is provided at an inlet of the guide plate of the first separator.

10. A screw compressor having an oil separator, said screw compressor comprising:

a compressor housing with an inlet for a refrigerant gas flow to flow in;

an oil separator housing connected to the compressor housing in a fastened and sealed manner and having an outlet for the refrigerant gas flow to flow out;

a compressing assembly disposed within the compressor housing and close to the inlet for compressing the refrigerant gas flow;

an electric motor for driving the compressing assembly;

wherein the screw compressor further comprises an oil separator, the oil separator is disposed within the oil separator housing and comprises a first separator for first separation of a freezing oil and a second separator for second separation of the freezing oil, wherein the second separator is disposed close to the outlet, and the first separator is disposed between the compressing assembly and the second separator;

wherein the inlet of the compressor housing and the outlet of the oil separator housing are on the same axis;

wherein the first separator is a cyclone separator configured to rotate a mixture of refrigerant and oil around a guide plate inside the oil separator housing by gas flow velocity at a discharge end of the compressing assembly;

wherein the second separator comprises a filter-type oil separator.