Oil and gas separation device and air conditioning unit

Abstract

The utility model provides a kind of oil-gas separation device and air conditioning unit, oil-gas separation device includes: shell, the upper portion of the shell is equipped with gas outlet and air inlet, bottom is equipped with oil return port;Spiral separation component is arranged in the shell, and the air inlet of shell is communicated, and the oil return air hole is equipped on the spiral separation component.The utility model is provided with spiral separation component inside oil separation device, forms rotating airflow under the guidance of helical structure, oil droplet with greater density is thrown to shell inner wall and converges under the action of centrifugal force, and finally backflows to bottom and is discharged by oil return air hole;Gas-phase refrigerant is discharged by oil return air hole and gas outlet, and the flow rate of refrigerant can be reduced while avoiding impacting frozen oil on the bottom of shell.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to an oil-gas separation device and an air conditioning unit. Background Technology

[0002] Currently, in air conditioning refrigeration systems, the refrigerant vapor discharged from the exhaust port of a screw compressor is often mixed with the compressor's refrigeration lubricating oil. When this refrigerant vapor, mixed with the compressor's refrigeration lubricating oil, enters the heat exchanger and undergoes heat exchange with the refrigerant, the heat exchange efficiency is significantly reduced due to the influence of the refrigeration lubricating oil. Therefore, an oil separator device needs to be installed between the compressor and the heat exchanger to separate the lubricating oil mixed with the refrigerant vapor, thereby improving the heat exchange efficiency of the refrigeration system. Common separator structures include external and internal types.

[0003] The external oil-gas separator utilizes centrifugal separation, gravity separation, filter adsorption separation, and collision separation. After separation, the refrigerant oil collects at the bottom of the container, hence the presence of a return oil pipe, level gauge, or oil level mirror at the bottom. If the gas velocity within the oil-gas separator is high or the flow field design is inadequate, the gaseous refrigerant will impact the refrigerant oil collected at the bottom of the container, causing level fluctuations, reducing the efficiency of the return oil pipe, and affecting the stable operation of the level gauge or oil level mirror.

[0004] Based on the above requirements, it is necessary to develop a high-efficiency oil-gas separation device to improve the separation efficiency of gaseous refrigerant and refrigeration oil, maintain a stable oil level at the bottom of the container under various operating conditions, ensure the unit's oil return efficiency, and ensure that the refrigeration system has sufficient heat exchange effect. Utility Model Content

[0005] In order to solve the technical problem that the high flow rate of the oil-gas separator in the prior art can easily impact the refrigeration oil collected at the bottom of the container, this utility model proposes an oil-gas separator and an air conditioning unit.

[0006] The technical solution adopted in this utility model is:

[0007] This utility model proposes an oil-gas separation device, comprising:

[0008] The housing has an air outlet and an air inlet at the top and an oil return port at the bottom.

[0009] A spiral separation assembly is disposed inside the housing and connected to the air inlet of the housing. The spiral separation assembly is provided with an oil-absorbing and breathable layer.

[0010] The spiral separation assembly includes:

[0011] A spiral tube is disposed inside the housing and extends spirally, with one end of the spiral tube located at the upper part connected to the air inlet of the housing.

[0012] Furthermore, the inner wall of the spiral tube of the spiral separation assembly is provided with an oil-absorbing and breathable layer.

[0013] Furthermore, the spiral separation assembly also includes:

[0014] An extruder moves along the inner wall of the spiral tube and squeezes the oil-absorbing and breathable layer to expel the refrigeration oil during the movement.

[0015] A driving component drives the extruder to move along the inner wall of the spiral tube.

[0016] Furthermore, the spiral tube is arranged vertically, and one end of the spiral tube at the lower part is connected to a return tube. The bottom of the return tube is U-shaped and extends vertically upward to connect to the pre-set opening at the top of the spiral tube. The extrusion member is spherical, and the driving member is an electromagnetic launcher. The extrusion member moves downward along the spiral tube to the bottom of the return tube under the action of gravity, and then is pushed back to the top of the spiral tube by the electromagnetic force of the electromagnetic launcher.

[0017] Furthermore, the preset opening is equipped with a one-way door that automatically opens when the extrusion component passes through.

[0018] Furthermore, the spiral tube has two layers of walls: an inner wall and an outer wall, and the spiral tube is divided into multiple spiral segments; each spiral segment has multiple oil return vent holes on its inner wall and an air outlet hole on the upper part of its outer wall.

[0019] Furthermore, the bottom of the inner wall of the spiral section is also provided with an oil return hole.

[0020] Furthermore, the bottom of the outer wall of the spiral tube protrudes downwards along its length to form an oil return groove.

[0021] This utility model also proposes an air conditioning unit, including the above-mentioned oil-gas separation device.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. A spiral separation component is installed inside the oil separation device, which allows the gas-oil mixture to rotate and flow along the spiral structure of the device. Under the action of centrifugal force, the frozen oil droplets are separated and collected on the inner wall of the device.

[0024] 2. The rotary separation assembly includes a compressible porous sponge and a magnetically driven rolling ball. The spiral separation device has an inner and outer layer structure. The magnetically driven rolling ball and the compressible oil-absorbing sponge are disposed in the inner layer of the spiral separation device. The magnetically driven rolling ball can roll in the inner layer of the device. During the rolling process, it squeezes the porous sponge, causing the adsorbed refrigeration oil to be separated again.

[0025] 3. The bottom of the return pipe forms a return oil pipeline. The refrigeration oil flows along the return pipe and returns to the bottom of the oil separator, thereby reducing oil level fluctuations and making the oil return stable and reliable. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front structural diagram of the oil separation device in an embodiment of this utility model;

[0028] Figure 2 yes Figure 1 BB cross-section diagram;

[0029] Figure 3 This is a cross-sectional schematic diagram of the spiral tube with holes in an embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the upper part of the oil separation device according to an embodiment of the present invention;

[0031] Figure 5 This is a top view of the oil separation device in an embodiment of this utility model;

[0032] 1. Air intake;

[0033] 2. Air outlet;

[0034] 3. Oil return port;

[0035] 4. Top cover plate;

[0036] 5. Shell;

[0037] 6. Spiral tube;

[0038] 61. Outer pipe wall; 62. Inner pipe wall; 63. Oil-absorbing and venting layer; 64. Extruded component; 65. One-way valve; 66. Oil return hole; 67. Vent hole; 68. Oil return vent hole;

[0039] 7. Lower cover plate;

[0040] 8. Drive components;

[0041] 9. Base;

[0042] 10. Return pipe. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0044] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0045] Existing oil-gas separators have high gas flow rates or poor flow field design, which can cause gaseous refrigerant to impact the refrigeration oil collected at the bottom of the container, leading to liquid level fluctuations. This reduces the oil return efficiency of the unit's return pipe and affects the stable operation of the level gauge or oil level mirror.

[0046] In this regard, such as Figure 1 As shown, this utility model proposes an oil-gas separation device. By setting a spiral separation component inside the shell 5 of the oil-gas separation device, the gas flow rate is reduced, and the gaseous refrigerant is prevented from directly impacting the refrigeration oil collected at the bottom of the container, thereby improving the oil return efficiency of the unit's oil return pipe.

[0047] like Figure 1 As shown, the oil-gas separation device specifically includes a housing 5 and a spiral separation assembly. Wherein:

[0048] The housing 5 is a sealed structure with an outlet 2 and an inlet 1 at its upper part to allow the discharge of gaseous refrigerant and the entry of oil-containing refrigerant, respectively. An oil return port 3 is located at the bottom of the housing 5 to collect and discharge the separated refrigerant oil. A spiral separator assembly is installed inside the housing 5 and directly connected to the inlet 1. This assembly employs a spiral structure design, allowing liquid oil to flow back to the bottom of the housing 5 under gravity. Simultaneously, the gas flows within the spiral channel under centrifugal force, promoting oil-gas separation. The connection between the spiral separator assembly and the inlet 1 ensures that oil-containing gas, after entering the housing 5, first enters the spiral structure, where centrifugal separation along the spiral path achieves efficient oil-gas separation. An oil-absorbing and permeable layer is incorporated within the spiral separator assembly to further promote oil-gas separation.

[0049] With the above structure, oil-containing gas enters the spiral separator through the inlet and forms a rotating airflow under the guidance of the spiral structure. Under the action of centrifugal force, the denser oil droplets are thrown towards the inner wall of the shell and converge, eventually flowing to the bottom and being discharged; the gaseous refrigerant is discharged through the outlet. This device utilizes the centrifugal separation of the spiral structure and the directional flow guidance function of the vent holes to achieve efficient oil-gas separation without additional power, while also being compact and easy to maintain.

[0050] Specifically, the spiral separation assembly includes a spiral tube 6, which adopts a longitudinal spiral structure, extending spirally along the central axis or inner wall of the housing 5, with its top port directly connected to the air inlet 1 of the housing 5. The cross-sectional shape of the spiral tube 6 can be designed as circular according to separation requirements, forming a continuous spiral gas channel inside. When oil-containing gas enters from the air inlet 1, it is guided along the inner wall of the spiral tube 6 to form a rotating airflow, causing the oil-gas mixture to produce a stratification effect under the action of centrifugal force—the denser oil droplets are thrown towards the inner wall of the spiral tube 6, while the gaseous refrigerant remains flowing in the central region. The longitudinal extension design of the spiral tube 6 ensures that the gas is continuously affected by centrifugal force in the spiral path, improving separation efficiency.

[0051] Furthermore, such as Figure 3 As shown, an oil-absorbing and venting layer 63 is provided on the inner wall of the spiral tube 6. The oil-absorbing and venting layer 63 is attached to the inner wall surface of the spiral tube 6 and continuously laid along the spiral direction of the tube. This layer is made of porous oil-absorbing material, which can absorb oil droplets and allow gas to pass through. The oil-absorbing and venting layer 63 cooperates with the oil return vents 68 on the surface of the spiral tube 6. The absorbed refrigerant oil can continue to flow downward along the spiral tube to the oil return vents provided on the spiral tube, and finally flow back to the oil return port 3 at the bottom of the shell 5. Gaseous refrigerant can flow out through the oil-absorbing and venting holes.

[0052] It enhances the interception capability of fine oil droplets, avoiding secondary oil droplet carryover caused by insufficient centrifugal force. No additional power assistance is required; through the synergistic effect of material properties and spiral airflow, the thoroughness and stability of oil-gas separation are improved.

[0053] In a further preferred embodiment, such as Figure 2 , 3 As shown, the spiral separation assembly includes a spiral tube 6, an extruder 64, and a drive member 8. The extruder 64 is a movable oil-scraping structure, such as a rolling ball or a scraper. The extruder 64 slides along the inner wall of the spiral tube 6, and its movement trajectory is consistent with the spiral direction of the spiral tube 6. The drive member 8 causes the extruder 64 to move periodically along the inner wall of the spiral tube 6.

[0054] When the extruder 64 moves under the drive, its protruding portion periodically squeezes the oil-absorbing and venting layer 63, forcibly squeezing out the refrigerant oil from the saturated adsorption area. The squeezed oil permeates through the return oil vent 68 and flows out, returning to the bottom of the housing 5 along the direction of gravity. This active extrusion design avoids the channel blockage problem caused by long-term adsorption of the oil-absorbing material, while ensuring efficient oil discharge and maintaining the continuous adsorption capacity of the oil-absorbing layer.

[0055] This extrusion-driven linkage structure enables active cleaning of the oil-absorbing and breathable layer 63, overcoming the drawback of decreased separation efficiency after material saturation in traditional passive adsorption separation. Through the synergistic effect of mechanical extrusion and spiral centrifugation, the stable separation performance of the device is further improved in high oil mist concentration environments.

[0056] Specifically, the spiral tube 6 is arranged vertically, with its bottom connected to the top via a return tube 10, forming a closed-loop circulation path. The lower end of the return tube 10 is designed with a U-shaped bend, forming a lowest point with a return oil hole (allowing the refrigerant oil flowing downwards along the inner wall of the spiral tube to eventually flow to the bottom of the shell through this return oil hole, while also preventing fluctuations in the liquid level of the return oil chamber at the bottom of the shell during oil return). It then extends vertically upwards and connects to a pre-set opening at the top of the spiral tube 6 (the top of the return tube 10 also has a bend guide structure to prevent the extruder from getting stuck), forming the return channel for the extruder 64. The extruder 64 has a spherical structure, with an outer diameter slightly smaller than the inner diameter of the spiral tube 6, ensuring free rolling within the gaps in the inner wall of the tube. When the extruder 64 contacts the oil-absorbing and breathable layer 63, it can effectively compress the fluid. The spherical material must be magnetically conductive to generate force with the electromagnetic drive component 8.

[0057] The electromagnetic drive unit 8 consists of a coil assembly and a controller, specifically located at the bottom of the housing 5, directly opposite the return tube 10. When the extruded ball rolls down the inner wall of the spiral tube 6 under gravity to the bottom of the return tube 10, the controller activates the electromagnetic coil (or can remain activated indefinitely), generating a directional electromagnetic force to push the ball upwards along the return tube 10 back to the top inlet of the spiral tube 6. The activation and deactivation of the electromagnetic force are triggered by a position sensor, achieving an automated cycle of the extruded ball's movement.

[0058] As the extrusion ball rolls downwards within the spiral tube 6, it continuously squeezes the oil-absorbing and breathable layer 63, forcibly squeezing out and returning the adsorbed refrigerant oil. Upon reaching the bottom of the return tube 10, electromagnetic force lifts it up and pushes it back to the top, completing one full cycle. This design, through the alternating action of gravity and electromagnetic force, allows the extrusion component 64 to achieve reciprocating motion without complex mechanical transmission, simplifying the device structure and reducing maintenance requirements. The ball rolling extrusion method features uniform contact surface and low motion resistance, while the U-shaped design of the return tube 10 ensures that excess oil can flow back to the bottom of the housing 5, preventing residue.

[0059] Furthermore, by controlling the amount of energy provided by the electromagnetic drive component 8, the magnetic rolling ball (extrusion component 64) can acquire different kinetic energies, further regulating the speed of the magnetic rolling ball within the spiral tube 6. When the speed of the magnetic rolling ball is different, the speed at which the sponge precipitates refrigeration oil will also be different. This further achieves the function of controlling the refrigeration oil separation efficiency of the oil separator.

[0060] In specific embodiments, such as Figure 4As shown, a one-way door 65 is preset to the opening, and its structure is a lightweight baffle that can be automatically opened and closed. One end of the door is hinged to the edge of the opening, and the other end is kept in a normally closed state by a spring or gravity reset mechanism. When the extrusion ball is pushed to the opening position by electromagnetic force along the return tube 10, the ball contacts the door and applies pressure, forcing the door to rotate around the hinge point and open, providing a channel for the extrusion ball to enter the top of the spiral tube 6. After the extrusion ball passes through, the door quickly springs back and closes under the action of the reset device to prevent gas backflow or leakage.

[0061] The one-way door 65 design achieves physical isolation between the extrusion component 64 and the gas inside the device: it briefly opens when the extrusion ball enters and remains sealed for the rest of the time, ensuring stable airflow pressure inside the spiral tube 6 and preventing purified gas from flowing back to the return tube 10 through the opening during the separation process. Its automated opening and closing process requires no additional power, relying entirely on the physical pushing of the extrusion ball and the elastic potential energy of the reset mechanism, further simplifying the device structure and reducing energy consumption.

[0062] In specific embodiments, such as Figure 3 As shown, the spiral tube 6 adopts a double-wall structure, consisting of an inner tube wall 62 and an outer tube wall 61 forming a concentric cylindrical interlayer. The inner tube wall 62 faces the spiral gas channel side (directly connected to the air inlet), while the outer tube wall 61 forms an external support structure. The spiral tube 6 is divided into multiple independent spiral segments along the longitudinal direction (these spiral segments are only a virtual division for ease of understanding; in reality, the spiral tube 6 is not structurally divided into segments, but only to facilitate the illustration of the placement of structures such as the oil return vent 68). Multiple oil return vents 68 are opened on the side of the inner tube wall 62 of each spiral segment (the oil return vents 68 are arranged circumferentially, specifically four per node, located on the side in cross-section). The oil return vents 68 are in direct contact with the adsorption surface of the oil absorption and venting layer 63. Under the pressure of the adsorption, the saturated refrigerant oil flows through the oil return vents 68 into the annular interlayer space between the outer tube wall 61 and the inner tube wall 62, and finally collects at the bottom of the shell 5. An outlet hole 67 is opened at the top of the outer tube wall 61 (which can be the top of the outer tube wall of each spiral segment) to form a flow channel for refrigerant gas to flow out of the spiral tube.

[0063] The oil-gas mixture undergoes a complete process of centrifugal separation, oil adsorption, and oil discharge in each segment of the spiral path, with multiple segments connected in series to further improve the overall separation efficiency. Specifically, the inner tube wall 62 is responsible for separation and oil discharge, while the outer tube wall 61 provides support and refrigerant discharge. The differentiated layout of the holes on the inner and outer walls ensures the directional flow paths of the oil and gas, avoiding cross-interference.

[0064] Specifically, in the inner structure, a porous sponge is provided on its wall surface as a breathable layer. This sponge can allow gas to pass through while filtering oil droplets in the mixed gas. Multiple oil return vent holes 68 are opened on the inner wall surface. The separated gas will enter the space formed by the outer wall and the inner wall through these oil return vent holes 68 on the inner wall surface. It will then return to the inside of the shell 5 through the vent hole 67 at the top of the outer wall surface and then return to the refrigeration system through the vent outlet 2 of the shell 5. The refrigerant oil separated and absorbed in the sponge will be partially squeezed out of the sponge as the magnetic rolling ball (i.e., the extruder 64) moves along the spiral structure of the inner wall surface. It will enter the space formed by the inner wall and the outer wall through the oil return vent holes 68 and fall into the oil return groove at the bottom of the outer wall surface under the action of gravity. It will then flow along the spiral structure of the pipe to the bottom of the return pipe 10 and enter the inside of the shell 5 through the oil return hole 66 at the bottom of the return pipe 10. Another portion of the refrigeration oil, when the sponge absorbs enough, will slowly precipitate out along the oil return hole 66 at the bottom of the inner wall due to gravity, fall into the space formed by the inner wall and the outer wall, and gather in the oil return groove at the bottom of the outer wall and flow into the bottom of the shell 5.

[0065] Specifically, an oil return hole 66 is added to the bottom of the inner tube wall 62 of each spiral section (which can be the lowest point of each spiral path or on the same cross-section as the oil return vent). The diameter of the bottom oil return hole 66 can be slightly larger than the oil return vent 68 on the inner tube wall 62 to accelerate the collection speed of the refrigerant oil that has penetrated the oil absorption layer into the interlayer space. This prevents the oil from accumulating on the surface of the inner tube wall 62 or flowing back to the next process section.

[0066] In a preferred embodiment, the bottom of the outer wall 61 of the spiral tube 6 is designed with a downwardly protruding oil return groove along the longitudinal extension direction. The groove is arranged in a continuous groove shape along the bottom of the outer wall 61. The cross-section of the oil return groove can be V-shaped or U-shaped, and the bottom surface of the groove is inclined outward to form a slope, ensuring that the liquid flows along the groove wall to the lowest point under the action of gravity.

[0067] The return oil trough is connected to the annular interlayer space between the inner and outer pipe walls 61, serving as a dedicated collection and diversion channel for the refrigeration oil, preventing oil residue or dripping onto other areas of the device.

[0068] In specific embodiments, such as Figure 1 , 5As shown, the housing 5 is cylindrical with openings at the top and bottom. An upper cover plate 4 is installed at the top, and a lower cover plate 7 is installed at the bottom to seal the top and bottom of the housing 5. A base 9 is also provided at the bottom, supporting the bottom of the lower cover plate 7. An air outlet 2 is provided in the middle of the upper cover plate 4 and connected to an air outlet pipe. An air inlet 1 is provided on the upper side of the housing 5 and connected to an air inlet pipe. The bottom area of ​​the housing 5 forms an oil return chamber and is provided with an oil return port 3, which is connected to an oil return pipe. The magnetic induction head of the electromagnetic drive 8 can be located at the bottom of the lower cover plate 7 and inside the base 9. The electromagnetic repulsion of the magnetic induction head is vertically upward and directly opposite the left side of the bottom of the return tube 10 (when the magnetic rolling ball rolls to the bottom of the return tube 10 and continues to roll upward to the left side of the bottom of the return tube 10, the electromagnetic repulsion can push the magnetic rolling ball upward to the top of the spiral tube 6), so that the magnetic rolling ball can return and circulate along the return tube 10.

[0069] This utility model also proposes an air conditioning unit, including the above-mentioned oil-gas separation device.

[0070] By installing a spiral separation component inside the shell of the oil-gas separator, the gas flow rate is reduced, and the gaseous refrigerant is prevented from directly impacting the refrigeration oil collected at the bottom of the container, thereby improving the oil return efficiency of the unit's oil return pipe.

[0071] It should be noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0072] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0073] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0074] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

Claims

1. An oil-gas separation device, characterized in that, include: The housing has an air outlet and an air inlet at the top and an oil return port at the bottom. A spiral separation assembly is disposed inside the housing and connected to the air inlet of the housing. The spiral separation assembly is provided with an oil-absorbing and breathable layer.

2. The oil-gas separation device as described in claim 1, characterized in that, The spiral separation assembly includes: A spiral tube is disposed inside the housing and extends spirally, with one end of the spiral tube located at the upper part connected to the air inlet of the housing.

3. The oil-gas separation device as described in claim 2, characterized in that, The spiral tube of the spiral separation assembly is provided with an oil-absorbing and breathable layer on its inner wall.

4. The oil-gas separation device as described in claim 3, characterized in that, The spiral separation assembly also includes: An extruder moves along the inner wall of the spiral tube and squeezes the oil-absorbing and breathable layer to expel the refrigeration oil during the movement. A driving component drives the extruder to move along the inner wall of the spiral tube.

5. The oil-gas separation device as described in claim 4, characterized in that, The spiral tube is vertically arranged, and a return tube is connected to the lower end of the spiral tube. The bottom of the return tube is U-shaped and extends vertically upward to connect to the pre-set opening at the top of the spiral tube. The extrusion member is spherical, and the driving member is an electromagnetic transmitter. The extrusion member moves downward along the spiral tube to the bottom of the return tube under the action of gravity, and then is pushed back to the top of the spiral tube by the electromagnetic force of the electromagnetic transmitter.

6. The oil-gas separation device as described in claim 5, characterized in that, The preset opening is equipped with a one-way door that automatically opens when the extrusion member passes through.

7. The oil-gas separation device as described in claim 2, characterized in that, The spiral tube has two layers: an inner tube wall and an outer tube wall, and the spiral tube is divided into multiple spiral segments. Each spiral segment has multiple oil return and vent holes on its inner tube wall, and an air outlet hole on the upper part of its outer tube wall.

8. The oil-gas separation device as described in claim 7, characterized in that, The bottom of the inner wall of the spiral section is also provided with an oil return hole.

9. The oil-gas separation device as described in claim 2, characterized in that, The bottom of the outer wall of the spiral tube protrudes downwards along its length to form an oil return groove.

10. An air conditioning unit, characterized in that, Includes the oil-gas separation device as described in any one of claims 1 to 9.

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