Oil separator and refrigerant circulation system

Abstract

The present invention discloses an oil separator and a refrigerant circulation system, wherein the oil separator comprises: a centrifugal core, the centrifugal core can rotate along its own axis, a separation chamber is formed inside the centrifugal core; along the direction from the first end to the second end of the centrifugal core, the separation chamber comprises a plurality of centrifugal sections arranged in sequence, and an oil outlet is arranged on the centrifugal core; a driving mechanism, the driving mechanism is connected to the centrifugal core and drives the centrifugal core to rotate; an inlet pipe, connected to the first end of the centrifugal core, the inlet pipe is communicated with the separation chamber; an outlet pipe, connected to the second end of the centrifugal core, the outlet pipe is communicated with the separation chamber. The oil separator and the refrigerant circulation system of the present invention effectively solve the problem that the oil separator in the prior art cannot be flexibly set and easily leads to a decrease in system performance.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to an oil separator and a refrigerant circulation system. Background Art

[0002] In the refrigerant circulation system (such as the air-to-water heater system), due to the working characteristics of the compressor, lubricating oil is an indispensable compressor protection accessory. During the operation of the system, the lubricating oil will inevitably mix with the refrigerant and pass through the entire system flow path. The current disadvantages of this configuration are: 1. Increased fluid resistance; 2. The effective refrigerant heat exchange volume per unit time with the air side is reduced; 3. It may cause serious consequences of compressor oil shortage. In short, the compressor lubricating oil running in the system with the refrigerant will affect the performance and reliability of the entire system.

[0003] In order to solve the above problems, the prior art system will be designed with an oil separator in the exhaust section to separate the oil and return it to the compressor. Figure 1 The working principle of the prior art oil separator is as follows: the oil and the refrigerant enter the container 102 via the inlet pipe 101, the oil enters the compressor via the oil return pipe 103 through the oil separation bottom layer, and the gaseous refrigerant enters the compressor via the outlet pipe 104, thereby achieving the separation of the lubricating oil and the gaseous refrigerant.

[0004] This type of oil separator in the prior art has two drawbacks: 1. Due to the limitation that it can only separate gaseous refrigerant and lubricating oil, installing it in the suction section cannot solve the above problems, so it can only be installed between the system exhaust and the heat exchanger, and cannot be flexibly set, which has great restrictions on structural design. 2. Since it can only be set in the exhaust section, the return oil in this section needs to be connected to the low-pressure chamber of the compressor. The pressure difference between the oil separator and the compressor is large, and the return oil speed is difficult to control, which is likely to cause the refrigerant circulation to cause performance degradation, which is difficult for system design.

[0005] In summary, the oil separator in the prior art cannot be flexibly positioned and is likely to cause system performance degradation. Summary of the invention

[0006] An oil separator and a refrigerant circulation system are provided in the embodiments of the present invention to solve the problem that the oil separator in the prior art cannot be flexibly arranged in a position and easily leads to a decrease in system performance.

[0007] To achieve the above-mentioned object, the present invention provides an oil separator, comprising: a centrifugal separation core, the centrifugal separation core can rotate along its own axis, a separation cavity is formed inside the centrifugal separation core; along the direction from the first end to the second end of the centrifugal separation core, the separation cavity comprises a plurality of centrifugal segments arranged in sequence, and an oil outlet hole is arranged on the centrifugal separation core;

[0008] A driving mechanism, the driving mechanism is connected to the centrifugal separation core and drives the centrifugal separation core to rotate;

[0009] An inlet pipe connected to the first end of the centrifugal separation core, the inlet pipe being in communication with the separation chamber;

[0010] An outlet pipe is connected to the second end of the centrifugal separation core, and the outlet pipe is communicated with the separation chamber.

[0011] Furthermore, along the flow direction of the refrigerant, the diameter of the side wall of the centrifugal section gradually increases.

[0012] Furthermore, there is a transition section between two adjacent centrifugal sections, and the side wall diameter of the transition section is a fixed value.

[0013] Furthermore, the separation chamber further comprises a liquid separation section, which is located downstream of the plurality of centrifugal sections in a direction from the first end to the second end of the centrifugal separation core, and the oil outlet hole is provided on a side wall of the liquid separation section.

[0014] Furthermore, there are a plurality of the oil outlet holes, and the plurality of the oil outlet holes are distributed along the circumferential direction of the centrifugal separation core.

[0015] Furthermore, the plurality of centrifugal segments include a first centrifugal segment and a second centrifugal segment, and the first centrifugal segment is located upstream of the second centrifugal segment along the flow direction of the refrigerant;

[0016] The side wall corresponding to the first centrifugal section is a first side wall, and the first side wall is a conical surface;

[0017] The side wall corresponding to the second centrifugal section is a second side wall, and the second side wall is a conical surface;

[0018] The taper of the first side wall is smaller than the taper of the second side wall.

[0019] Furthermore, the transition section is connected between the first centrifugal section and the second centrifugal section, and a connecting component is provided on the outer wall of the centrifugal separation core corresponding to the transition section, and the connecting component is drivingly connected to the driving mechanism.

[0020] Furthermore, the connecting component is a gear ring, the gear ring is fixedly connected to the outer wall of the centrifugal separation core, the driving mechanism includes a motor and a gear, and the motor is meshed with the gear ring through the gear.

[0021] Furthermore, the connecting component is a driving groove, the driving mechanism includes a motor and a pulley, and the motor is drivingly connected to the driving groove via the pulley.

[0022] Furthermore, it also includes a shell, the centrifugal separation core is installed inside the shell, the inlet pipe and the outlet pipe are connected to the shell, the driving mechanism is installed on the shell, and the shell is provided with an oil return port.

[0023] Further, the inlet pipe is fixedly connected to the housing, a bearing is provided between the inlet pipe and the centrifugal separation core, and the axis of the inlet pipe is colinear with the rotation axis of the centrifugal separation core;

[0024] The outlet pipe is fixedly connected to the shell, a bearing is arranged between the outlet pipe and the centrifugal separation core, and the axis of the outlet pipe is colinear with the rotation axis of the centrifugal separation core.

[0025] Furthermore, the separation chamber further comprises a liquid separation section, which is located downstream of the plurality of centrifugal sections in a direction from the first end to the second end of the centrifugal separation core, and an oil outlet hole is arranged on a side wall of the liquid separation section;

[0026] The oil return port is communicated with the interior of the housing, and the position of the oil return port is arranged corresponding to the position of the liquid separation section.

[0027] According to another aspect of the present invention, a refrigerant circulation system is provided, comprising the above-mentioned oil separator.

[0028] Further, the refrigerant circulation system includes a compressor, a condenser and an evaporator connected by a refrigerant pipeline;

[0029] The oil separator further comprises a housing, the centrifugal separation core is installed inside the housing, the inlet pipe and the outlet pipe are connected to the housing, the driving mechanism is installed on the housing, and an oil return port is provided on the housing;

[0030] The oil return port is communicated with the compressor, the inlet pipe is communicated with the condenser, and the outlet pipe is communicated with the evaporator.

[0031] After the gas-liquid mixture enters the centrifugal separation core through the inlet pipe, the centrifugal separation core will rotate under the action of the driving mechanism. The centrifugal force generated by the rotation will cause the gas-liquid mixture of different densities to be layered. The layers thus generated can be used for separation and extraction, wherein the lubricating oil with a higher density will be distributed in the outer layer of the centrifugal section, and the gas-liquid mixed refrigerant with a lower density will be distributed in the central layer of the centrifugal section. The outer lubricating oil after layering flows out through the oil outlet hole and returns to the compressor, and the gas-liquid mixed refrigerant enters the refrigerant circulation system through the outlet pipe and continues to flow along the system. The oil separator of the present invention can effectively perform liquid-liquid separation and separate the lubricating oil from the gas-liquid mixture through multiple centrifugal sections arranged in sequence. Since the device can completely layer the lubricating oil and the liquid refrigerant according to its centrifugal separation principle, it can be set at a position other than the exhaust section of the compressor, and the setting position and selection are more flexible. Moreover, since a position other than the exhaust section can be selected, the speed of the oil return can be adjusted by adjusting the size of the oil return port and the diameter of the oil return pipe, so the oil return speed can be effectively controlled, and the oil return can be early to prevent the compressor from lacking oil, thereby ensuring the continuous and stable performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an oil separator in the prior art;

[0033] Figure 2 is a schematic diagram of the internal structure of an oil separator according to an embodiment of the present invention;

[0034] Figure 3 yes Figure 2 A partial structural diagram of an oil separator;

[0035] Figure 4 2 is a schematic structural diagram of a centrifugal separation core of an oil separator according to an embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of the external structure of an oil separator according to an embodiment of the present invention;

[0037] Figure 6 is a schematic structural diagram of a housing of an oil separator according to an embodiment of the present invention;

[0038] Figure 7 is a schematic diagram of the structural decomposition of an oil separator according to an embodiment of the present invention;

[0039] Figure 8 Schematic diagram of system connection of a refrigerant circulation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0041] See also Figures 2 to 7 As shown, according to an embodiment of the present invention, an oil separator is provided, which includes a centrifugal core 10, a driving mechanism 20, an inlet pipe 30 and an outlet pipe 40. The centrifugal core 10 can rotate along its own axis, and a separation chamber 11 is formed inside the centrifugal core 10; along the direction from the first end to the second end of the centrifugal core 10, the separation chamber 11 includes a plurality of centrifugal sections 12 arranged in sequence, and an oil outlet hole 10a is provided on the centrifugal core 10; the driving mechanism 20 is drivingly connected to the centrifugal core 10 and drives the centrifugal core 10 to rotate; the inlet pipe 30 is connected to the first end of the centrifugal core 10, and the inlet pipe 30 is communicated with the separation chamber 11; the outlet pipe 40 is connected to the second end of the centrifugal core 10, and the outlet pipe 40 is communicated with the separation chamber 11.

[0042] After the gas-liquid mixture enters the centrifugal separation core through the inlet pipe, the centrifugal separation core will rotate under the action of the driving mechanism. The centrifugal force generated by the rotation will cause the gas-liquid mixture of different densities to be layered. The layers thus generated can be used for separation and extraction, wherein the lubricating oil with a higher density will be distributed in the outer layer of the centrifugal section, and the gas-liquid mixed refrigerant with a lower density will be distributed in the central layer of the centrifugal section. The outer lubricating oil after layering flows out through the oil outlet hole and returns to the compressor, and the gas-liquid mixed refrigerant enters the refrigerant circulation system through the outlet pipe and continues to flow along the system. The oil separator of the present invention can effectively perform liquid-liquid separation and separate the lubricating oil from the gas-liquid mixture through multiple centrifugal sections arranged in sequence. Since the device can completely layer the lubricating oil and the liquid refrigerant according to its centrifugal separation principle, it can be set at a position other than the exhaust section of the compressor, and the setting position and selection are more flexible. Moreover, since a position other than the exhaust section can be selected, the speed of the oil return can be adjusted by adjusting the size of the oil return port and the diameter of the oil return pipe, so the oil return speed can be effectively controlled, and the oil return can be early to prevent the compressor from lacking oil, thereby ensuring the continuous and stable performance of the system.

[0043] Preferably, along the flow direction of the refrigerant, the diameter of the side wall of the centrifugal section 12 gradually increases. The diameter of the side wall of the centrifugal section 12 gradually increases, which strengthens the centrifugal effect during the rotation process and increases the separation efficiency.

[0044] Furthermore, there is a transition section 13 between two adjacent centrifugal sections 12, and the sidewall diameter of the transition section 13 is a fixed value. The function of the transition section 13 is to make the liquid pass through a gentle transition, so that the passing liquid produces a better overall centrifugal motion, so that the subsequent centrifugal section can achieve better liquid-liquid separation.

[0045] Combination Figures 2 to 4As shown, the separation chamber 11 further includes a liquid separation section 14, which is located downstream of the plurality of centrifugal sections 12 in the direction from the first end to the second end of the centrifugal separation core 10, and the oil outlet hole 10a is provided on the side wall of the liquid separation section 14. The liquid separation section 14 is located downstream of the last centrifugal section along the refrigerant flow direction, that is, the liquid separation section is provided between the centrifugal section closest to the outlet pipe among all the centrifugal sections and the outlet pipe.

[0046] The function of the liquid separation section 14 is to efficiently collect the separated lubricating oil. After the refrigerant is separated by all the centrifugal sections, the lubricating oil adheres to the inner wall of the liquid separation section 14 and quickly flows out through the oil outlet 10a.

[0047] There are multiple oil outlet holes 10a, which are distributed along the circumferential direction of the centrifugal separation core 10. The oil outlet holes 10a are arranged along the circumference of the centrifugal separation core 10, so that the separated lubricating oil can be quickly discharged when the centrifugal separation core rotates.

[0048] In this embodiment, the plurality of centrifugal segments 12 include a first centrifugal segment 12a and a second centrifugal segment 12b, wherein the first centrifugal segment 12a is located upstream of the second centrifugal segment 12b along the flow direction of the refrigerant;

[0049] The side wall corresponding to the first centrifugal section 12a is the first side wall A1, and the first side wall A1 is a conical surface;

[0050] The side wall corresponding to the second centrifugal section 12b is the second side wall A2, and the second side wall A2 is a conical surface;

[0051] The taper of the first side wall A1 is smaller than the taper of the second side wall A2.

[0052] The first centrifugal section 12a plays a role in causing the mixed liquid to quickly produce centripetal motion, and a preliminary separation is performed in this section. The mixed liquid entering the second centrifugal section 12b will be separated more thoroughly under a stronger centrifugal action. Based on the above coordination, the taper of the first centrifugal section 12a is relatively small, so as to make a gentle transition, so that the liquid passing through can produce a better overall centrifugal motion, and then the mixed liquid can be better separated thoroughly through the second centrifugal section 12b. This embodiment balances the product volume and the separation effect. Under the condition of sufficient rotation speed, the two centrifugal sections can achieve a high-efficiency separation effect and reach the separation efficiency value of the oil separator.

[0053] See also Figure 4 The transition section 13 is connected between the first centrifugal section 12a and the second centrifugal section 12b. A connecting component 15 is provided on the outer wall of the centrifugal separation core 10 corresponding to the transition section 13. The connecting component 15 is drivingly connected to the driving mechanism 20.

[0054] The transition section 13 not only plays the role of separation transition, but also has a connecting component 15 set at its corresponding position as a driving structure. The transition section 13 is located in the middle of the centrifugal core, so the connecting component 15 at this position can make the centrifugal core rotate more smoothly and match a higher speed. The side wall diameter of the transition section 13 is a fixed value, the manufacturing process is simple, and the structural stress of the connecting component 15 can be averaged during the rotation drive process, and it can maintain stable operation for a long time. In summary, the structural function of the transition section 13 has achieved the effect of one thing for multiple uses.

[0055] In this embodiment, the connecting component 15 is a gear ring, which is fixedly connected to the outer wall of the centrifugal separation core 10. The driving mechanism 20 includes a motor and a gear, and the motor is meshed with the gear ring through the gear.

[0056] In other embodiments not shown in the figures, the connecting component 15 and the driving mechanism 20 may also be in other forms. In other embodiments, the connecting component 15 is a driving groove, and the driving mechanism 20 includes a motor and a pulley, and the motor is driven and connected to the driving groove through the pulley.

[0057] The oil separator further comprises a housing 50 , the centrifugal separation core 10 is mounted inside the housing 50 , the inlet pipe 30 and the outlet pipe 40 are connected to the housing 50 , the driving mechanism 20 is mounted on the housing 50 , and an oil return port 51 is provided on the housing 50 .

[0058] The housing 50 is used to match and install all the above structures. The structure has strong versatility and can be flexibly set in different pipeline sections.

[0059] Preferably, the inlet pipe 30 is fixedly connected to the housing 50, a bearing 60 is provided between the inlet pipe 30 and the centrifugal separation core 10, and the axis of the inlet pipe 30 is colinear with the rotation axis of the centrifugal separation core 10;

[0060] The outlet pipe 40 is fixedly connected to the housing 50 , a bearing 60 is disposed between the outlet pipe 40 and the centrifugal separation core 10 , and an axis of the outlet pipe 40 is colinear with a rotation axis of the centrifugal separation core 10 .

[0061] The centrifugal core 10 rotates relative to the inlet pipe and the outlet pipe, and the bearing 60 is used to reduce friction and achieve a supporting effect. Such a structural combination can reduce the rotational mass of the centrifugal core 10, increase the rotation speed, and is not affected by interference from other structures.

[0062] The separation chamber 11 further includes a liquid separation section 14, which is located downstream of the plurality of centrifugal sections 12 along the direction from the first end to the second end of the centrifugal separation core 10, and an oil outlet hole 10a is provided on the side wall of the liquid separation section 14;

[0063] The oil return port 51 is communicated with the interior of the housing 50 , and the position of the oil return port 51 is arranged corresponding to the position of the liquid separation section 14 .

[0064] The oil return port 51 is designed at the position of the liquid separation section to take the oil back to the compressor as soon as possible, and the oil return efficiency is higher.

[0065] The housing 50 is cylindrical in shape, with a motor platform designed on it for fixing the drive structure (generally a motor). The left and right end faces of the housing each have a hole for welding and fixing with the inlet pipe and the outlet pipe. The cylindrical liquid separation section is provided with an oil outlet hole, which is used to release the stratified lubricating oil into the housing and return it to the compressor through the oil return port 51.

[0066] The oil separator of this embodiment has the following advantages: 1. Timely oil return to reduce system resistance. 2. Early oil return to prevent compressor from lack of oil. 3. Flexible setting position, can choose the position outside the exhaust section of the compressor, and it can be installed after the condenser, such as before the expansion valve, it is located in the medium pressure area. If it is after the expansion valve, it is located in the low pressure area. Compared with the oil separator that can only be set in the high pressure area, the oil separator of this embodiment has the characteristics of better control. 4. It can meet different oil separation requirements, and has higher versatility and flexibility.

[0067] Combination Figure 8 As shown, the present invention provides an embodiment of a refrigerant circulation system, and the refrigerant circulation system includes the oil separator of the above embodiment.

[0068] Preferably, the refrigerant circulation system comprises a compressor B1, a condenser B2 and an evaporator B3 connected by a refrigerant pipeline, and an oil separator B4 is connected between the condenser B2 and the evaporator B3;

[0069] The oil separator further comprises a housing 50, the centrifugal separation core 10 is mounted inside the housing 50, the inlet pipe 30 and the outlet pipe 40 are connected to the housing 50, the driving mechanism 20 is mounted on the housing 50, and an oil return port 51 is provided on the housing 50;

[0070] The oil return port 51 is in communication with the compressor B1 , the inlet pipe 30 is in communication with the condenser B2 , and the outlet pipe 40 is in communication with the evaporator B3 .

[0071] The oil separator B4 separates and returns oil before the evaporator B3 to increase the refrigerant heat exchange volume per unit time and improve performance. At this time, the medium is a mixture of refrigerant and lubricating oil in a gas-liquid mixed state. After the medium is centrifugally layered and diverted through the oil separator B4, only the lubricating oil flows back to the compressor through the oil return port, and the refrigerant continues to run along the system and enters the evaporator B3, improving the heat exchange performance.

[0072] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0074] Of course, the above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. An oil separator, characterized in that: include: A centrifugal separation core (10), the centrifugal separation core (10) being rotatable along its own axis, a separation chamber (11) being formed inside the centrifugal separation core (10); along a direction from a first end to a second end of the centrifugal separation core (10), the separation chamber (11) comprises a plurality of centrifugal segments (12) arranged in sequence, and an oil outlet hole (10a) is provided on the centrifugal separation core (10); A driving mechanism (20), the driving mechanism (20) being drivingly connected to the centrifugal separation core (10) and driving the centrifugal separation core (10) to rotate; an inlet pipe (30) connected to the first end of the centrifugal separation core (10), the inlet pipe (30) being in communication with the separation chamber (11); an outlet pipe (40) connected to the second end of the centrifugal separation core (10), the outlet pipe (40) being in communication with the separation chamber (11); The plurality of centrifugal segments (12) include a first centrifugal segment (12a) and a second centrifugal segment (12b), wherein the first centrifugal segment (12a) is located upstream of the second centrifugal segment (12b) along the flow direction of the refrigerant; The side wall corresponding to the first centrifugal section (12a) is a first side wall (A1), and the first side wall (A1) is a conical surface; The side wall corresponding to the second centrifugal section (12b) is a second side wall (A2), and the second side wall (A2) is a conical surface; The taper of the first side wall (A1) is smaller than the taper of the second side wall (A2).

2. The oil separator according to claim 1, characterized in that: Along the flow direction of the refrigerant, the diameter of the side wall of the centrifugal section (12) gradually increases.

3. The oil separator according to claim 2, characterized in that: A transition section (13) is provided between two adjacent centrifugal sections (12), and the side wall diameter of the transition section (13) is a fixed value.

4. The oil separator according to claim 1, characterized in that: The separation chamber (11) further comprises a liquid separation section (14), the liquid separation section (14) being located downstream of the plurality of centrifugal sections (12) in a direction from the first end to the second end of the centrifugal separation core (10), and the oil outlet hole (10a) is provided on a side wall of the liquid separation section (14).

5. The oil separator according to claim 4, characterized in that: The number of the oil outlet holes (10a) is plural, and the plural oil outlet holes (10a) are distributed along the circumferential direction of the centrifugal separation core (10).

6. The oil separator according to claim 3, characterized in that: The transition section (13) is connected between the first centrifugal section (12a) and the second centrifugal section (12b); a connecting component (15) is provided on an outer wall of the centrifugal separation core (10) corresponding to the transition section (13); and the connecting component (15) is drivingly connected to the driving mechanism (20).

7. The oil separator according to claim 6, characterized in that: The connecting component (15) is a gear ring, the gear ring is fixedly connected to the outer wall of the centrifugal separation core (10), the driving mechanism (20) comprises a motor and a gear, and the motor is meshed with the gear ring via the gear.

8. The oil separator according to claim 6, characterized in that: The connecting component (15) is a driving groove, and the driving mechanism (20) comprises a motor and a pulley, and the motor is drivingly connected to the driving groove via the pulley.

9. The oil separator according to claim 1, characterized in that: It also comprises a housing (50), the centrifugal separation core (10) is mounted inside the housing (50), the inlet pipe (30) and the outlet pipe (40) are connected to the housing (50), the drive mechanism (20) is mounted on the housing (50), and an oil return port (51) is provided on the housing (50).

10. The oil separator according to claim 9, characterized in that The inlet pipe (30) is fixedly connected to the housing (50), a bearing (60) is provided between the inlet pipe (30) and the centrifugal separation core (10), and the axis of the inlet pipe (30) is colinear with the rotation axis of the centrifugal separation core (10); The outlet pipe (40) is fixedly connected to the housing (50), a bearing (60) is provided between the outlet pipe (40) and the centrifugal separation core (10), and the axis of the outlet pipe (40) is colinear with the rotation axis of the centrifugal separation core (10).

11. The oil separator according to claim 9, characterized in that: The separation chamber (11) further comprises a liquid separation section (14), the liquid separation section (14) being located downstream of the plurality of centrifugal sections (12) in a direction from the first end to the second end of the centrifugal separation core (10), and an oil outlet hole (10a) being provided on a side wall of the liquid separation section (14); The oil return port (51) is in communication with the interior of the housing (50), and the position of the oil return port (51) is arranged corresponding to the position of the liquid separation section (14).

12. A refrigerant circulation system, characterized in that: An oil separator comprising the oil separator according to any one of claims 1 to 11.

13. The refrigerant circulation system according to claim 12, characterized in that: The refrigerant circulation system comprises a compressor (B1), a condenser (B2) and an evaporator (B3) connected by a refrigerant pipeline; The oil separator further comprises a housing (50), the centrifugal separation core (10) is mounted inside the housing (50), the inlet pipe (30) and the outlet pipe (40) are connected to the housing (50), the drive mechanism (20) is mounted on the housing (50), and an oil return port (51) is provided on the housing (50); The oil return port (51) is in communication with the compressor (B1), the inlet pipe (30) is in communication with the condenser (B2), and the outlet pipe (40) is in communication with the evaporator (B3).

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