Oil-gas separation device and air conditioning unit

Abstract

The invention provides an oil-gas separation device and an air conditioning unit, the oil-gas separation device comprises: a housing, the upper part of which is provided with a gas outlet and a gas inlet, and the bottom of which is provided with an oil return port; the spiral separation assembly is arranged in the shell and communicated with the air inlet of the shell, and an oil return air hole is formed in the spiral separation assembly. According to the oil separation device, the spiral separation assembly is arranged in the oil separation device, rotary airflow is formed under the guidance of a spiral structure, oil-gas mixtures enable oil drops with large density to be thrown to the inner wall of the shell and converged under the action of centrifugal force, and finally the oil drops flow back to the bottom through the oil return air holes to be discharged; the gas-phase refrigerant is discharged through the oil return air hole and the air outlet, so that the flow speed of the refrigerant can be reduced, and refrigerant oil at the bottom of the shell is prevented from being impacted.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an oil-gas separation device and an air conditioning unit. Background Art

[0002] In current air conditioning and refrigeration systems, the refrigerant vapor discharged from the exhaust port of a screw refrigeration compressor often mixes with the compressor's refrigerant lubricant. When the refrigerant vapor, mixed with the compressor's refrigerant lubricant, enters the heat exchanger and exchanges heat with the refrigerant, it is affected by the refrigerant lubricant, significantly reducing the heat exchange efficiency between the refrigerant and the refrigerant. Therefore, an oil separator is required between the compressor and the heat exchanger to separate the lubricant from the refrigerant vapor and improve the heat exchange efficiency of the refrigeration system. Common separation structures include external and internal ones.

[0003] The external oil-gas separation device uses a variety of separation mechanisms, including centrifugal separation, gravity separation, filter adsorption separation, and collision separation. After separation, the refrigerant oil collects at the bottom of the container, so an oil return pipe, liquid level gauge, or oil level mirror is installed at the bottom. If the gas flow rate within the oil-gas separation device is high or the flow field design is improper, the gaseous refrigerant will impact the refrigerant oil collected at the bottom of the container, causing liquid level fluctuations, reducing the oil return efficiency of the unit's return pipe, and affecting the stable operation of the liquid level gauge or oil level mirror.

[0004] Based on the above requirements, it is necessary to develop an efficient oil-gas separation device to improve the separation efficiency of gaseous refrigerant and refrigeration oil, maintain the stability of the oil level at the bottom of the container under various operating conditions, ensure the oil return efficiency of the unit, and ensure that the refrigeration system has sufficient heat exchange effect. Summary of the Invention

[0005] In order to solve the technical problem in the prior art that the flow rate of the oil-gas separation device is too high and easily impacts the refrigeration oil collected at the bottom of the container, the present invention proposes an oil-gas separation device and an air conditioning unit.

[0006] The technical solution adopted in the present invention is:

[0007] The present invention provides an oil-gas separation device, comprising:

[0008] A housing, wherein an air outlet and an air inlet are provided at the top of the housing, and an oil return port is provided at the bottom;

[0009] The spiral separation component is arranged in the shell and is connected to the air inlet of the shell. An oil-absorbing and air-permeable layer is provided in the spiral separation component.

[0010] The spiral separation assembly includes:

[0011] The spiral tube is arranged in the shell and extends spirally, and one end of the spiral tube located at the upper part is connected to the air inlet of the shell.

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

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

[0014] An extrusion member moves along the inner wall of the spiral tube and squeezes the oil-absorbing and breathable layer to squeeze out the refrigeration oil during the movement;

[0015] The driving member drives the extruding member 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 preset opening at the top of the spiral tube. The extrusion piece is spherical, and the driving piece is an electromagnetic launch piece. After the extrusion piece moves downward along the spiral tube to the bottom of the return tube under the action of gravity, it is pushed back to the top of the spiral tube along the return tube by the electromagnetic force of the electromagnetic launch piece.

[0017] Furthermore, the preset opening is provided with a one-way door which automatically opens when the extrusion member passes through.

[0018] Furthermore, the spiral tube wall includes two layers, an inner tube wall and an outer tube wall, and the spiral tube is divided into multiple spiral segments; the inner tube wall of each spiral segment is provided with multiple oil return air holes, and the upper part of the outer tube wall is provided with an air outlet.

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

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

[0021] The present invention also provides an air-conditioning unit, comprising 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 set inside the oil separation device, which can make the gas-oil mixture flow along the spiral structure of the device. Under the action of centrifugal force, the frozen oil droplets separate and converge on the inner wall of the device.

[0024] 2. The rotary separation assembly includes a compressible porous sponge and a magnetic rolling ball. The spiral separation device has an inner and outer layer structure. The magnetic rolling ball and the compressible oil-absorbing sponge are placed in the inner layer of the spiral separation device. The magnetic rolling ball can roll within the inner layer of the device, squeezing the porous sponge during rolling, allowing the adsorbed refrigerant oil to be separated again.

[0025] 3. An oil return line is formed at the bottom of the return pipe. The refrigerant 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 2 is a front structural diagram of an oil separation device according to an embodiment of the present invention;

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

[0029] Figure 3 2. It is a schematic cross-sectional view of a spiral tube with holes in an embodiment of the present invention;

[0030] Figure 4 2. It is a schematic structural diagram of the upper portion of the oil separation device according to an embodiment of the present invention;

[0031] Figure 5 1 is a top view schematic diagram of an oil separation device according to an embodiment of the present invention;

[0032] 1. Air intake;

[0033] 2. Air outlet;

[0034] 3. Oil return port;

[0035] 4. Upper cover;

[0036] 5. Shell;

[0037] 6. Spiral tube;

[0038] 61. Outer tube wall; 62. Inner tube wall; 63. Oil-absorbing and breathable layer; 64. Extrusion piece; 65. One-way door; 66. Oil return hole; 67. Air outlet hole; 68. Oil return and breathable hole;

[0039] 7. Lower cover;

[0040] 8. Driving parts;

[0041] 9. Base;

[0042] 10. Return pipe. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0045] The gas flow rate in the existing oil-gas separation device is high or the flow field design is unreasonable. The gaseous refrigerant easily impacts the refrigeration oil collected at the bottom of the container, causing liquid level fluctuations, thereby reducing the oil return efficiency of the unit's return oil pipe and affecting the stable operation of the liquid level gauge or oil level mirror.

[0046] In this regard, Figure 1 As shown, the present invention proposes an oil-gas separation device, which reduces the gas flow rate by arranging a spiral separation component in the shell 5 of the oil-gas separation device, while preventing the gas-phase refrigerant 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 component.

[0048] The shell 5 is a closed structure, with an air outlet 2 and an air inlet 1 provided on its upper part for respectively discharging gaseous refrigerant and entering oil-containing refrigerant; an oil return port 3 is provided at the bottom of the shell 5 for collecting and discharging the separated refrigeration oil; the spiral separation component is installed in the inner cavity of the shell 5 and is directly connected to the air inlet 1 of the shell 5. The component adopts a spiral structure design, which allows the liquid oil to flow back to the bottom of the shell 5 by gravity. At the same time, the gas is subjected to centrifugal force when flowing in the spiral channel, which promotes the separation of oil and gas. The connection design between the spiral separation component and the air inlet 1 allows the oil-containing gas to first enter the interior of the spiral structure after entering the shell 5, and achieve efficient separation of oil and gas through centrifugal separation of the spiral path. An oil-absorbing and breathable layer is provided in the spiral separation component to further promote the separation of oil and gas.

[0049] Through this structure, oil-containing gas enters the spiral separation assembly through the air inlet, where it is guided by the spiral structure to form a rotating airflow. Centrifugal force propels the denser oil droplets of the oil-gas mixture toward the inner wall of the shell, where they converge and eventually flow to the bottom for discharge. The gaseous refrigerant is then discharged through the air outlet. This device utilizes the centrifugal separation of the spiral structure and the directional flow guidance of the air holes to achieve efficient oil-gas separation without the need for additional power, while also being compact and easy to maintain.

[0050] Specifically, the spiral separation component includes: a spiral tube 6, which adopts a longitudinal spiral structure and extends spirally along the central axis or inner wall of the shell 5, and its top port is directly connected to the air inlet 1 of the shell 5. The cross-sectional shape of the spiral tube 6 can be designed to be circular according to the separation requirements, and a continuous spiral gas channel is formed inside. When the 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, so that the oil-gas mixture produces a stratification effect under the action of centrifugal force - the denser oil droplets are thrown to the inner wall of the spiral tube 6, while the gaseous refrigerant maintains the flow in the center area. The longitudinal extension design of the spiral tube 6 ensures that the gas is continuously affected by the centrifugal force in the spiral path, thereby improving the separation efficiency.

[0051] Further, such as Figure 3 As shown, an oil-absorbing, breathable layer 63 is provided on the inner wall of the spiral tube 6. This layer is adhered to the inner surface of the spiral tube 6 and laid continuously along the spiral path of the tube. This layer is made of a porous, oil-absorbing material that absorbs oil droplets while allowing gas to pass through. The oil-absorbing, breathable layer 63 cooperates with the oil return holes 68 on the surface of the spiral tube 6. Adsorbed refrigerant oil continues to flow down the spiral tube to the oil return holes provided therein, ultimately returning to the oil return port 3 at the bottom of the shell 5. The gaseous refrigerant can then flow out through the oil-absorbing, breathable holes.

[0052] The ability to intercept fine oil droplets is enhanced, preventing secondary oil droplet carryover caused by insufficient centrifugal force. Without the need for additional power assistance, the synergistic effect of material properties and spiral airflow improves the thoroughness and stability of oil and gas separation.

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

[0054] As the extrusion element 64 is driven to move, its raised portion periodically squeezes the oil-absorbing, breathable layer 63, forcibly expelling the refrigerant oil from the saturated areas. The squeezed oil then seeps through the oil return holes 68, flows out, and, driven by gravity, flows back to the bottom of the housing 5. This active extrusion design prevents blockage of the oil-absorbing material due to prolonged adsorption, while ensuring efficient oil removal and maintaining the continuous adsorption capacity of the oil-absorbing layer.

[0055] This extrusion-driven linkage structure actively cleans the oil-absorbing, breathable layer 63, resolving the drawback of traditional passive adsorption separation, where separation efficiency decreases after material saturation. The synergistic effect of mechanical extrusion and spiral centrifugation further enhances the device's stable separation performance in environments with high oil mist concentrations.

[0056] Specifically, the spiral tube 6 is arranged vertically, and its bottom forms a closed-loop circulation path with the top through a return tube 10. The lower end of the return tube 10 is designed as a U-shaped bending structure, with the bottom forming the lowest point and provided with an oil return hole (so that the refrigerant oil flowing downward along the inner wall of the spiral tube can eventually flow to the bottom of the shell through the oil return hole, and at the same time, it can also prevent the liquid level in the oil return chamber at the bottom of the shell from fluctuating during oil return). Then it extends vertically upward and connects with the preset opening at the top of the spiral tube 6 (the top of the return tube 10 also has a bending guide structure to prevent the extrusion member from getting stuck), forming a return channel for the extrusion member 64. The extrusion member 64 adopts a spherical structure, and its outer diameter is slightly smaller than the inner diameter of the spiral tube 6 to ensure that it can roll freely in the gap between the inner walls of the tube. When the extrusion member 64 contacts the oil-absorbing and breathable layer 63, effective extrusion can be formed. The material of the sphere must have magnetic conductivity in order to generate a force with the electromagnetic drive member 8.

[0057] The electromagnetic drive element 8, consisting of a coil assembly and a controller, is located at the bottom of the housing 5, directly opposite the return tube 10. When the squeeze ball rolls down the inner wall of the spiral tube 6 under the influence of gravity to the bottom of the return tube 10, the controller activates the electromagnetic coil (or can remain activated), generating a directional electromagnetic force that pushes the ball upward along the return tube 10 and back to the top entrance of the spiral tube 6. The electromagnetic force is activated and deactivated by a position sensor, achieving an automated cycle of the squeeze ball's movement.

[0058] As the extrusion ball rolls downward within the spiral tube 6, it continuously squeezes the oil-absorbing, breathable layer 63, forcing the adsorbed refrigerant oil out and back into the air. Upon reaching the bottom of the return tube 10, electromagnetic force lifts it and pushes it back to the top, completing a complete cycle. This design, through the alternating action of gravity and electromagnetic force, enables reciprocating motion of the extrusion element 64 without the need for complex mechanical transmission, simplifying the device structure and reducing maintenance requirements. The ball rolling extrusion method features a uniform contact surface and low motion resistance. The U-shaped design of the return tube 10 also ensures that excess oil can flow back to the bottom of the housing 5, preventing any residue.

[0059] Furthermore, by controlling the energy provided by the electromagnetic driver 8, the magnetic rolling ball (extrusion element 64) can be given different kinetic energies, further adjusting the speed of the magnetic rolling ball within the spiral tube 6. When the magnetic rolling ball moves at different speeds, the speed at which the sponge releases refrigerant oil also varies, further controlling the refrigerant oil separation efficiency of the oil separator.

[0060] In a specific embodiment, Figure 4As shown, a one-way door 65 is provided at the pre-set opening. This door is a lightweight, automatically opening and closing barrier. One end of the door is hinged to the edge of the opening, while the other end is maintained in a normally closed position by a spring or gravity-reset mechanism. When the squeezing ball is pushed along the return tube 10 by electromagnetic force to the opening, the ball contacts the door and exerts pressure, forcing the door to rotate open around the hinge point, allowing the squeezing ball to enter the top of the spiral tube 6. After the squeezing ball passes through, the door quickly rebounds closed by the reset mechanism, preventing gas backflow or leakage.

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

[0062] In a specific embodiment, Figure 3 As shown, the spiral tube 6 adopts a double-layer tube wall structure, with 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), and 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 (the spiral segments are only virtual divisions for the convenience of understanding. In fact, the spiral tube 6 has no direct structural segmentation, but is only for the convenience of explaining the location of the return oil vent 68 and other structures). A plurality of return oil vents 68 are provided on the side of the inner tube wall 62 of each spiral segment (the return oil vents 68 are arranged along the circumference, and specifically 4 can be set at each node, and are located on the side when viewed from the cross section). The return oil vents 68 are in direct contact with the adsorption surface of the oil absorption and permeability layer 63. Under the action of extrusion, the adsorption-saturated refrigerant oil flows through the return oil vents 68 into the annular interlayer space between the outer tube wall 61 and the inner tube wall 62, and finally converges to the bottom of the shell 5. An air outlet 67 is provided at the top of the outer tube wall 61 (which may be the top of the outer tube wall of each spiral segment) to form a flow channel for the refrigerant gas to flow out of the spiral tube.

[0063] Each section of the spiral path allows the oil-gas mixture to undergo a complete process of centrifugal separation, oil absorption, and oil discharge. Multiple sections in series further enhance overall separation efficiency. 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 a directional flow path for the oil and gas, preventing cross-interference.

[0064] Specifically, within the inner structure, a porous sponge is provided on its wall surface. This sponge allows gas to pass through while filtering oil droplets from the mixed gas. The inner wall body is provided with multiple oil return holes 68. The separated gas flows through these oil return holes 68 into the space formed by the outer and inner walls. It then returns to the interior of the housing 5 through the outlet hole 67 at the top of the outer wall and then to the refrigeration system through the outlet 2 of the housing 5. As the magnetic rolling ball (i.e., the extrusion element 64) moves along the spiral structure of the inner wall, a portion of the refrigerant oil separated and absorbed in the sponge is squeezed out of the sponge by the rolling motion of the magnetic rolling ball. It then enters the space formed by the inner and outer walls through the oil return holes 68 and, under the influence of gravity, falls into the oil return groove at the bottom of the outer wall. It then flows along the spiral structure of the pipe to the bottom of the return pipe 10 and enters the interior of the housing 5 through the oil return hole 66 at the bottom of the return pipe 10. When the sponge absorbs enough of the other part of the refrigerant oil, it will slowly precipitate out along the oil return hole 66 at the bottom of the inner wall due to the influence of gravity, fall into the space formed by the inner wall and the outer wall, and converge into the oil return groove at the bottom of the outer wall to flow into the bottom of the shell 5.

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

[0066] In a preferred embodiment, the outer wall 61 of the spiral tube 6 is provided with a downwardly projecting oil return groove along its longitudinal extension. This groove is arranged as a continuous groove along the bottom of the outer wall 61. The cross-section of the oil return groove can be V-shaped or U-shaped, with the bottom surface of the groove tilted 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 oil return groove is connected to the annular interlayer space between the inner and outer tube walls 61, serving as a dedicated collection and diversion channel for the refrigeration oil to prevent the oil from remaining on the outer surface of the tube wall or dripping into other areas of the device.

[0068] In a specific embodiment, Figure 1 、 5As shown, the shell 5 is in the shape of a circular tube with openings at the top and bottom. An upper cover plate 4 is installed on the top, and a lower cover plate 7 is installed on the bottom to close the top and bottom of the shell 5. At the same time, a base 9 is also provided at the bottom to support the bottom of the lower cover plate 7; and an air outlet 2 is provided in the middle of the upper cover plate 4 and is connected to the air outlet pipe, an air inlet 1 is provided at the upper side position of the shell 5 and is connected to the air inlet pipe, an oil return chamber is formed in the bottom area of ​​the shell 5, and an oil return port 3 is provided, and the oil return port 3 is connected to the oil return pipe. The magnetic induction head of the electromagnetic drive component 8 can be specifically located at the bottom of the lower cover plate 7 and inside the base 9. The electromagnetic repulsive force direction of the magnetic induction head is vertically upward and directly facing the left side of the bottom of the return pipe 10 (after the magnetic rolling ball rolls to the bottom of the return pipe 10, it continues to roll upward when rolling to the left side of the bottom of the return pipe 10. At this time, the electromagnetic repulsive force can push the magnetic rolling ball to be launched upward to the force of the top of the spiral tube 6), so that the magnetic rolling ball can return along the return pipe 10.

[0069] The present invention also provides an air-conditioning unit, comprising the above-mentioned oil-gas separation device.

[0070] By setting a spiral separation component in the shell of the oil-gas separation device, the gas flow rate is reduced, and at the same time, the gas phase 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 terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" 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 of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0073] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

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

Claims

1. An oil-gas separation device, characterized in that: include: A housing, wherein an air outlet and an air inlet are provided at the top of the housing, and an oil return port is provided at the bottom; The spiral separation component is arranged in the shell and is connected to the air inlet of the shell. An oil-absorbing and air-permeable layer is provided in the spiral separation component.

2. The oil-gas separation device according to claim 1, characterized in that: The spiral separation assembly comprises: The spiral tube is arranged in the shell and extends spirally, and one end of the spiral tube located at the upper part is connected to the air inlet of the shell.

3. The oil-gas separation device according to claim 2, characterized in that: The inner wall of the spiral tube of the spiral separation component is provided with an oil-absorbing and breathable layer.

4. The oil-gas separation device according to claim 3, characterized in that: The spiral separation assembly further comprises: An extrusion member moves along the inner wall of the spiral tube and squeezes the oil-absorbing and breathable layer to squeeze out the refrigeration oil during the movement; The driving member drives the extruding member to move along the inner wall of the spiral tube.

5. The oil-gas separation device according to claim 4, characterized in that: The spiral tube is arranged vertically, and one end of the spiral tube at the bottom is connected to a return tube. The bottom of the return tube is U-shaped and extends vertically upward to connect to the preset opening at the top of the spiral tube. The extrusion piece is spherical, and the driving piece is an electromagnetic launch piece. After the extrusion piece moves downward along the spiral tube to the bottom of the return tube under the action of gravity, it is pushed back to the top of the spiral tube along the return tube by the electromagnetic force of the electromagnetic launch piece.

6. The oil-gas separation device according to claim 5, characterized in that: The preset opening is provided with a one-way door which opens automatically when the extrusion piece passes through.

7. The oil-gas separation device according to claim 2, characterized in that: The spiral tube comprises an inner tube wall and an outer tube wall, and the spiral tube is divided into a plurality of spiral sections; a plurality of oil return air holes are provided on the inner tube wall of each spiral section, and an air outlet is provided on the upper portion of the outer tube wall.

8. The oil-gas separation device according to claim 7, characterized in that: An oil return hole is also provided at the bottom of the inner tube wall of the spiral section.

9. The oil-gas separation device according to claim 2, characterized in that: The bottom of the outer tube wall of the spiral tube protrudes downward along the length direction thereof to form an oil return groove.

10. An air conditioning unit, characterized in that: It comprises the oil-gas separation device according to any one of claims 1 to 9.

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