Oil and gas separation device and separation method for helium refrigerator

Abstract

The present invention relates to the technical field of oil-gas separation, and in particular to an oil-gas separation device and a separation method for a helium refrigerator, wherein the oil-gas separation device for a helium refrigerator comprises a separation cylinder, a primary collecting cylinder, a collecting membrane and an adjusting component, wherein the collecting membrane is arranged in a collecting chamber, and the gas containing oil flows in a spiral around the collecting chamber under the guidance of a spoiler, and when the gas containing oil flows in a spiral, the oil is subjected to centrifugal force, and the oil in the gas adheres to the collecting membrane, thereby preventing the oil impurities in the gas from directly contacting the inner wall of the separation cylinder, and when the gas containing oil flows in a spiral around the collecting chamber, the adjusting component can adjust the contour shape of the collecting membrane, and when the inner wall of the collecting membrane changes, the boundary effect is avoided when the gas flows in a spiral around the collecting chamber, thereby improving the separation efficiency of the oil in the gas.

Description

Technical Field

[0001] The invention relates to the technical field of oil-gas separation, and in particular to an oil-gas separation device and a separation method for a helium refrigerator. Background Art

[0002] During the operation of the helium refrigerator, the separation of the oil-gas mixture is a key link to ensure the stable operation of the equipment. Helium has unique physical properties in a low-temperature environment, but in the refrigeration cycle, lubricating oil will inevitably mix into the helium. In order to ensure the purity and refrigeration efficiency of helium, oil-gas separation equipment has become an indispensable component of the helium refrigeration system. Traditional oil-gas separation devices usually use cyclone separators to separate oil from helium through the rotation of the airflow. The separators of the prior art often have residual oil on the inner wall when they are shut down.

[0003] The residual oil on the inner wall of the separator may react with the gas that enters later, causing the helium in the refrigeration system to be contaminated, affecting the overall performance of the refrigerator. In addition, some types of lubricating oil may contain corrosive components, which will adhere to the inner wall of the separator for a long time, causing corrosion damage to the equipment and reducing the service life of the equipment. During the shutdown period, the residual oil on the inner wall of the separator may gradually accumulate and become viscous. Over time, the oil may block the flow channel of the separator, affecting the smoothness of the airflow during the next operation, resulting in reduced oil and gas separation efficiency. Summary of the invention

[0004] The invention provides an oil-gas separation device and a separation method for a helium refrigerator, so as to solve the problem that the existing separator reduces the oil-gas separation efficiency.

[0005] The oil-gas separation device and separation method for a helium refrigerator of the present invention adopt the following technical solutions:

[0006] An oil-gas separation device for a helium refrigerator comprises a separation cylinder, a primary collecting cylinder, a collecting membrane and a regulating component.

[0007] The separation cylinder has a separation chamber inside, the separation cylinder is vertically arranged, and an air inlet pipe, an air outlet and an oil drain port connecting the separation chamber and the external environment are arranged on the separation cylinder; the first-level collecting cylinder is coaxially fixedly arranged inside the separation cylinder, and the first-level collecting cylinder has a collecting chamber inside, the air inlet pipe is connected with the inside of the collecting chamber, and the upper end face of the first-level collecting cylinder is fixedly connected to the inner wall of the separation cylinder; an air guide duct is coaxially connected to the first-level collecting cylinder, and the air guide duct passes through the upper end face of the first-level collecting cylinder; a spoiler is arranged on the air guide duct, and the spoiler can disturb the gas entering the collecting chamber into a spiral flow; the collecting membrane is made of a flexible material, and the collecting membrane is arranged inside the first-level collecting cylinder, and the air inlet pipe passes through the collecting membrane, and the collecting membrane can prevent the oil in the gas from contacting the separation cylinder or the inner wall of the first-level collecting cylinder; the adjusting component is used to adjust the contour shape of the collecting membrane.

[0008] Furthermore, the regulating assembly includes a first regulating pump, a second regulating pump, a plurality of first spiral tubes and a plurality of second spiral tubes; a plurality of air guide holes are arranged on the side wall of the first-level collecting tube; a plurality of first spiral tubes are arranged between the outer wall of the first-level collecting tube and the inner wall of the separation tube, a plurality of second spiral tubes are arranged between the outer wall of the first-level collecting tube and the inner wall of the separation tube, each second spiral tube is arranged between two adjacent first spiral tubes, and the pitch of the first spiral tube and the second spiral tube is the same; the first regulating pump is used to supply gas to the plurality of first spiral tubes, and the second regulating pump is used to extract gas from the inside of the plurality of second spiral tubes, or the first regulating pump is used to extract gas from the inside of the plurality of first spiral tubes, and the second regulating pump is used to supply gas to the plurality of second spiral tubes.

[0009] Furthermore, both the first regulating pump and the second regulating pump are provided with a cooler, and the cooler is used to ensure that the first regulating pump and the second regulating pump blow out low-temperature gas.

[0010] Furthermore, the adjustment component also includes a winding roller and an unwinding roller, both of which are rotatably connected to the separation cylinder, and the side wall of the first-level collecting cylinder is provided with a first through groove and a second through groove, one end of the collecting film is wound around the winding roller through the first through groove, and the other end of the collecting film is wound around the unwinding roller through the second through groove; a power source for driving the winding roller and the unwinding roller to rotate is provided on the separation cylinder.

[0011] Furthermore, a new collecting film is wound on the unwinding roller. When the oil accumulated on the collecting film in the collecting chamber reaches a first preset level, the winding roller winds up the collecting film in the collecting chamber, and the unwinding roller releases the new collecting film into the collecting chamber.

[0012] Furthermore, a flow velocity detector is provided on the air duct, which is used to detect the speed of the spiral flow of gas in the collecting chamber; the adjustment component also includes a control board, which is used to receive data from the flow velocity detector; the control board can control the winding roller and the unwinding roller to simultaneously wind up the collecting film when the data from the flow velocity detector is less than a first preset value.

[0013] Furthermore, the spoiler is a spiral plate, and the spiral plate is spirally arranged around the outer wall of the air guide duct.

[0014] Furthermore, the collecting membrane is an elastic film, and the material of the collecting membrane is polytetrafluoroethylene with oleophobic properties.

[0015] Furthermore, it also includes a secondary collecting cylinder, which is installed at the air outlet, and the residual oil in the gas can be intercepted by the secondary collecting cylinder when it leaves the separation cylinder.

[0016] A method for separating oil and gas for a helium refrigerator, using the above-mentioned oil and gas separation device for a helium refrigerator, comprises the following steps:

[0017] S1, transporting the gas containing oil to the collecting chamber through the air inlet pipe;

[0018] S2, under the action of the spoiler, the gas flows spirally in the collecting chamber;

[0019] S3, adjusting the profile of the collecting membrane during the process of the oil adhering to the collecting membrane.

[0020] The beneficial effects of the present invention are as follows: an oil-gas separation device and a separation method for a helium refrigerator of the present invention, wherein the oil-gas separation device for a helium refrigerator comprises a separation cylinder, a primary collecting cylinder, a collecting membrane and an adjusting component. When the oil in the gas is centrally processed, the gas containing the oil is passed into the separation chamber through an air inlet pipe. By setting the position of the air inlet pipe, the gas containing the oil enters the inside of the cylindrical structure surrounded by the collecting membrane. The collecting membrane is arranged in the collecting chamber. The gas containing the oil flows in a spiral around the collecting chamber under the guidance of a spoiler. When the gas containing the oil flows in a spiral, the oil is subjected to centrifugal force, and the oil in the gas adheres to the collecting membrane, thereby avoiding direct contact between the oil impurities in the gas and the inner wall of the separation cylinder. Then the gas is discharged from the separation chamber through the air guide pipe, and then discharged from the separation cylinder through the air outlet. During the spiral flow of the gas containing the oil around the collecting chamber, the adjusting component can adjust the contour shape of the collecting membrane. When the inner wall of the collecting membrane changes, the boundary effect is avoided when the gas flows in a spiral around the collecting chamber, thereby improving the separation efficiency of the oil in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0022] Figure 1 A schematic structural diagram of an oil-gas separation device for a helium refrigerator provided in an embodiment of the present invention;

[0023] Figure 2 A side view of an oil-gas separation device for a helium refrigerator provided by an embodiment of the present invention;

[0024] Figure 3 for Figure 2 Sectional view in the AA direction;

[0025] Figure 4 for Figure 2 Cross-sectional view in the BB direction;

[0026] Figure 5A state diagram of a collecting membrane when data of a flow rate detector in an oil-gas separation device for a helium refrigerator provided by an embodiment of the present invention is less than a first preset value;

[0027] Figure 6 for Figure 3 A partial enlarged view of point C in the middle.

[0028] In the figure: 110, separation cylinder; 111, air inlet pipe; 112, air outlet; 113, oil drain port; 120, primary collecting cylinder; 130, collecting membrane; 140, air guide pipe; 210, first regulating pump; 220, second regulating pump; 230, first spiral tube; 240, second spiral tube; 250, air guide hole; 260, first air supply pipe; 270, second air supply pipe; 310, winding roller; 320, unwinding roller; 330, spiral plate; 340, secondary collecting cylinder. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] like Figures 1 to 6 As shown, an oil-gas separation device for a helium refrigerator provided in an embodiment of the present invention includes a separation cylinder 110, a primary collection cylinder 120, a collection membrane 130 and a regulating component.

[0033] The axis of the separation cylinder 110 is vertically arranged, and a bracket is arranged at the lower end of the separation cylinder 110. The separation cylinder 110 can be placed on the ground through the bracket. The separation cylinder 110 is hollow inside, and the hollow chamber inside the separation cylinder 110 is a separation chamber. The separation cylinder 110 is provided with an air inlet pipe 111 connecting the separation chamber with the external environment in the middle of the vertical direction. The air inlet pipe 111 runs through the side wall of the separation cylinder 110, and the gas containing oil can enter the separation chamber through the air inlet pipe 111. The upper end of the separation cylinder 110 is provided with an air outlet 112 connecting the separation chamber with the external environment, and the gas entering the separation chamber can leave the separation chamber through the air outlet 112. The lower end of the separation cylinder 110 is provided with an oil discharge port 113 connecting the separation chamber with the external environment, and the oil accumulated in the separation chamber can be discharged from the separation chamber through the oil discharge port 113. Furthermore, the oil discharge port 113 is in a blocked state during operation, and when there is no gas flow in the air inlet pipe 111 , the oil discharge port 113 can be in a conducting state.

[0034] The first-level collecting tube 120 is coaxially fixedly arranged inside the separation tube 110. The first-level collecting tube 120 is cylindrical. The upper end surface of the first-level collecting tube 120 is fixedly connected to the inner wall of the separation tube 110. The upper end surface of the first-level collecting tube 120 can separate the separation chamber into a relatively isolated first chamber and a second chamber, wherein the first chamber is above the second chamber. In the second chamber, there is a gap between the outer wall of the first-level collecting tube 120 and the inner wall of the separation chamber. The first-level collecting tube 120 has a collection chamber inside, and the air inlet pipe 111 is connected to the inside of the collection chamber. The gas entering the separation chamber through the air inlet pipe 111 can directly enter the collection chamber. The first-level collecting tube 120 is coaxially connected with an air guide pipe 140, which passes through the upper end surface of the first-level collecting tube 120, the lower end of the air guide pipe 140 is in the collection chamber, and the upper end of the air guide pipe 140 is in the first chamber of the separation chamber. A spoiler is provided on the air guide 140, which can disturb the gas entering the collecting chamber into a spiral flow. The gas entering the collecting chamber through the air inlet pipe 111 is converted into a spiral flow under the action of the spoiler. When the gas flows in a spiral, the oil in the gas is subjected to centrifugal force, thereby separating the gas from the oil.

[0035] The collecting membrane 130 is made of a flexible material and is disposed inside the primary collecting cylinder 120. The collecting membrane 130 can form a cylindrical structure that penetrates up and down in the collecting chamber. When the gas flows spirally in the collecting chamber, the oil in the gas can be driven onto the collecting membrane 130 under the action of centrifugal force. By setting the collecting membrane 130, the oil in the gas can be prevented from contacting the inner wall of the separation cylinder 110 or the primary collecting cylinder 120.

[0036] The regulating component is used to adjust the contour shape of the collecting membrane 130. When the oil contacts the collecting membrane 130, the inner wall of the collecting membrane 130 changes shape to avoid boundary effects when the gas spirals around the collecting chamber, thereby improving the separation efficiency of the oil in the gas.

[0037] In an oil-gas separation device for a helium refrigerator of the present invention, when the oil and liquid in the gas are centrally processed, the gas containing the oil and liquid is passed into the separation chamber through the air inlet pipe 111. By setting the position of the air inlet pipe 111, the gas containing the oil and liquid enters the cylindrical structure surrounded by the collecting membrane 130. The collecting membrane 130 is arranged in the collecting chamber. The gas containing the oil and liquid flows in a spiral around the collecting chamber under the guidance of the spoiler. When the gas containing the oil and liquid flows in a spiral, the oil and liquid are subjected to centrifugal force, and the oil and liquid in the gas adhere to the collecting membrane 130, so as to avoid direct contact between the oil and liquid impurities in the gas and the inner wall of the separation cylinder 110. Then, the gas is discharged from the separation chamber through the air guide pipe 140, and then discharged from the separation cylinder 110 through the air outlet 112. During the spiral flow of the gas containing the oil and liquid around the collecting chamber, the regulating component can adjust the contour shape of the collecting membrane 130. When the inner wall of the collecting membrane 130 changes, the boundary effect is avoided when the gas flows in a spiral around the collecting chamber, thereby improving the separation efficiency of the oil and liquid in the gas.

[0038] In one embodiment, the regulating assembly includes a first regulating pump 210, a second regulating pump 220, a plurality of first spiral tubes 230 and a plurality of second spiral tubes 240. A plurality of air guide holes 250 are provided on the side wall of the primary collecting cylinder 120. The plurality of first spiral tubes 230 are provided between the outer wall of the primary collecting cylinder 120 and the inner wall of the separation cylinder 110, and the plurality of second spiral tubes 240 are provided between the outer wall of the primary collecting cylinder 120 and the inner wall of the separation cylinder 110. Each second spiral tube 240 is provided between two adjacent first spiral tubes 230, and the first spiral tube 230 and the second spiral tube 240 have the same pitch, and a plurality of exhaust holes are provided on both the first spiral tube 230 and the second spiral tube 240. The first regulating pump 210 is used to supply gas to the multiple first spiral tubes 230, and the second regulating pump 220 is used to extract gas from the multiple second spiral tubes 240. Under the action of the first regulating pump 210 and the second regulating pump 220, the gas can pass through the gas guide hole 250 and act on the collection membrane 130, so that the shape of the collection membrane 130 changes. The first regulating pump 210 can also be used to extract gas from the multiple first spiral tubes 230, and the second regulating pump 220 can also be used to supply gas to the multiple second spiral tubes 240. In actual use, the first regulating pump 210 can be switched to pump or inhale air at a fixed time, and at the same time, the second regulating pump 220 can be switched to pump or inhale air at a fixed time. Under the joint action of the first regulating pump 210 and the second regulating pump 220, the shape of the collection membrane 130 changes continuously.

[0039] Further, in an adjacent first spiral tube 230 and a second spiral tube 240, the horizontal height of the lower end of the first spiral tube 230 is consistent with the horizontal height of the upper end of the second spiral tube 240. The outer wall of the separation cylinder 110 is provided with a first air supply pipe 260 and a second air supply pipe 270, the first air supply pipe 260 is connected to the plurality of first spiral tubes 230, the second air supply pipe 270 is connected to the plurality of second spiral tubes 240, the first regulating pump 210 is connected to the first air supply pipe 260, the second regulating pump 220 is connected to the second air supply pipe 270, and the first air supply pump and the second air supply pump work simultaneously.

[0040] In one embodiment, a cooler is provided on both the first regulating pump 210 and the second regulating pump 220, and the cooler is used to ensure that the first regulating pump 210 and the second regulating pump 220 blow out low-temperature gas. Specifically, both the first regulating pump 210 and the second regulating pump 220 are provided with a gas nozzle, and the cooler is installed on the gas nozzle. The cooler is a condenser. When the gas passes through the cooler, the temperature of the gas will decrease. When the low-temperature gas acts on the outer wall of the collection membrane 130 through the air guide hole 250, the overall temperature of the collection membrane 130 will decrease. At this time, when the oil contacts the collection membrane 130, the temperature of the oil can be quickly reduced. After the temperature of the oil is reduced, the viscosity of the oil increases, reducing the probability of the oil being carried away by the flowing gas again.

[0041] In one embodiment, the adjustment component also includes a winding roller 310 and an unwinding roller 320, and the winding roller 310 and the unwinding roller 320 are both rotatably connected to the separation cylinder 110, and the winding roller 310 and the unwinding roller 320 are both vertically arranged, and the winding roller 310 and the unwinding roller 320 are spaced apart. The side wall of the primary collecting cylinder 120 is provided with a first through groove and a second through groove, and the first through groove and the second through groove are spaced apart. One end of the collecting film 130 is wound around the winding roller 310 through the first through groove, and the other end of the collecting film 130 is wound around the unwinding roller 320 through the second through groove; a power source for driving the winding roller 310 and the unwinding roller 320 to rotate is provided on the separation cylinder 110. Specifically, the power source includes two drive motors, which are fixedly arranged on the separation cylinder 110. The power output shaft of one drive motor is fixedly connected to the winding roller 310, and the power output shaft of the other drive motor is fixedly connected to the unwinding roller 320. The two drive motors can drive the winding roller 310 and the unwinding roller 320 to rotate. The two drive motors can drive the winding roller 310 and the unwinding roller 320 to rotate in the same or opposite directions. When the rotation directions of the winding roller 310 and the unwinding roller 320 are the same, the size of the cylindrical structure that passes through the collection membrane 130 from top to bottom in the collection chamber changes.

[0042] In one embodiment, a new collection film 130 is wound on the unwinding roller 320. When the oil accumulated on the collection film 130 in the collection chamber reaches a first preset level, the winding roller 310 winds up the collection film 130 in the collection chamber, and the unwinding roller 320 releases the new collection film 130 into the collection chamber. Specifically, the first preset level is a parameter set manually. A visual sensor is provided in the collection chamber. The visual sensor is used to observe the amount of oil on the inner wall of the collection film 130. The visual sensor can obtain real-time image data of the inner wall of the collection film 130. The visual sensor can also obtain auxiliary image data of the inner wall of the collection film 130 when the oil accumulated on the collection film 130 reaches the first preset level. The visual sensor can compare the real-time image data with the auxiliary image data. When there is no difference between the two, the collection film 130 needs to be replaced. At this time, the winding roller 310 and the unwinding roller 320 rotate at the same time, and the unwinding roller 320 replaces the new collection film 130 into the collection chamber.

[0043] In one embodiment, a flow rate detector is provided on the air guide 140, and the flow rate detector is used to detect the speed of the spiral flow of the gas in the collection chamber. The speed of the spiral flow of the gas in the collection chamber affects the centrifugal force of the oil in the gas. The regulating component also includes a control board, and the control board is used to receive data from the flow rate detector; the control board can control the winding roller 310 and the unwinding roller 320 to simultaneously wind up the collection film 130 when the data of the flow rate detector is less than a first preset value. Furthermore, if the data of the flow rate detector is less than the first preset value, the oil in the gas may not contact the collecting membrane 130 due to its own centrifugal force. At this time, the control board controls the winding roller 310 and the unwinding roller 320 to rotate at the same time, and the winding roller 310 and the unwinding roller 320 simultaneously wind up the two ends of the collecting membrane 130. At this time, the cylindrical structure of the collecting membrane 130 that passes through the upper and lower parts in the collecting chamber is reduced. When the cylindrical structure of the gas formed by the collecting membrane 130 rotates, the space for the gas flow is reduced, and the speed of the spiral flow of the gas in the cylindrical structure formed by the collecting membrane 130 is relatively increased, thereby ensuring that the oil in the gas can be fully separated to the inner wall of the collecting membrane 130.

[0044] Furthermore, when the winding roller 310 and the unwinding roller 320 are simultaneously winding up the two ends of the collecting film 130, the first regulating pump 210 and the second regulating pump 220 are working simultaneously, the first regulating pump 210 supplies air to the multiple first spiral tubes 230 through the first air supply pipe 260, and the second regulating pump 220 supplies air to the multiple second spiral tubes 240 through the second air supply pipe 270, ensuring that when the winding roller 310 and the unwinding roller 320 are simultaneously winding up the collecting film 130, no negative pressure will occur between the outer wall of the collecting film 130 and the inner wall of the first-level collecting cylinder 120.

[0045] In one embodiment, the spoiler is a spiral plate 330, and the spiral plate 330 is spirally arranged around the outer wall of the air duct 140. Specifically, the upper end surface of the primary collecting tube 120 can separate the separation chamber into a relatively isolated first chamber and a second chamber, and the spiral plate 330 is arranged in the second chamber. The spiral plate 330 is fixedly arranged on the outer wall of the air duct 140. When the gas enters the collecting chamber through the air inlet pipe 111, the spiral plate 330 can guide the gas in a spiral manner, so that the gas flows in a spiral manner in the collecting chamber.

[0046] In one embodiment, the collecting membrane 130 is an elastic film, and the material of the collecting membrane 130 is polytetrafluoroethylene with oleophobic properties. By limiting the specific material of the collecting membrane 130, it is ensured that the collecting membrane 130 can be deformed when the first regulating pump 210 or the second regulating pump 220 is working. At the same time, when the oil contacts the collecting membrane 130, the oil can be quickly deposited downward. If part of the oil cannot be separated from the collecting membrane 130 in time, the oil accumulated on the collecting membrane 130 can be detected in time by the visual sensor.

[0047] In one embodiment, an oil-gas separation device for a helium refrigerator further includes a secondary collection tube 340, which is installed at the air outlet 112. The residual oil in the gas can be intercepted by the secondary collection tube 340 when it leaves the separation tube 110. The secondary collection tube 340 is a filter cotton. When the gas is discharged from the separation tube 110 through the air outlet 112, the gas needs to pass through the secondary collection tube 340 to ensure that the oil in the gas can be completely collected. By installing the secondary collection tube 340 at the air outlet 112, when the oil on the secondary collection tube 340 reaches a certain level, the staff can replace the secondary collection tube 340. Further, after the same batch of gas is processed, the staff replaces the secondary collection tube 340.

[0048] A method for separating oil and gas for a helium refrigerator, using an oil and gas separation device for a helium refrigerator, specifically comprises the following steps:

[0049] S1, the gas containing oil is transported to the collection chamber through the air inlet pipe 111. Specifically, during the operation of the helium refrigerator, helium has unique physical properties in a low temperature environment, but in the refrigeration cycle, lubricating oil will inevitably mix into the helium, and the mixture of helium and oil is transported to the collection chamber through the air inlet pipe 111.

[0050] S2, under the action of the spoiler, the gas spirally flows in the collection chamber. Specifically, the gas containing oil moves spirally around the circumference of the collection chamber under the action of the spoiler, and the oil is subjected to a certain centrifugal force. Under the action of the centrifugal force, the oil in the gas adheres to the collection membrane 130.

[0051] S3, adjusting the profile of the collecting membrane 130 during the process of the oil adhering to the collecting membrane 130. Specifically, when the inner wall of the collecting membrane 130 changes, the boundary effect generated when the gas spirally flows around the collecting cavity is avoided, thereby improving the separation efficiency of the oil in the gas.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-gas separation device for a helium refrigerator, characterized in that: include: A separation cylinder, wherein a separation chamber is provided inside the separation cylinder, the separation cylinder is arranged vertically, and an air inlet pipe, an air outlet and an oil discharge port are arranged on the separation cylinder to connect the separation chamber and the external environment; A first-stage collecting tube, the first-stage collecting tube is coaxially fixedly arranged inside the separation tube, the first-stage collecting tube has a collecting chamber inside, the air inlet pipe is connected to the inside of the collecting chamber, and the upper end surface of the first-stage collecting tube is fixedly connected to the inner side wall of the separation tube; the first-stage collecting tube is coaxially connected with an air guide pipe, and the air guide pipe runs through the upper end surface of the first-stage collecting tube; a spoiler is arranged on the air guide pipe, and the spoiler can disturb the gas entering the collecting chamber into a spiral flow; The collecting membrane is made of a flexible material and is arranged inside the first-stage collecting tube. The air inlet pipe runs through the collecting membrane. The collecting membrane can prevent the oil in the gas from contacting the separation tube or the inner wall of the first-stage collecting tube. An adjusting component, the adjusting component is used to adjust the contour shape of the collecting membrane; The regulating assembly includes a first regulating pump, a second regulating pump, a plurality of first spiral tubes and a plurality of second spiral tubes; a plurality of air guide holes are arranged on the side wall of the first-level collecting tube; a plurality of first spiral tubes are arranged between the outer wall of the first-level collecting tube and the inner wall of the separation tube, a plurality of second spiral tubes are arranged between the outer wall of the first-level collecting tube and the inner wall of the separation tube, each second spiral tube is arranged between two adjacent first spiral tubes, and the pitch of the first spiral tube and the second spiral tube is the same; the first regulating pump is used to supply gas to the plurality of first spiral tubes, and the second regulating pump is used to extract gas from the inside of the plurality of second spiral tubes, or the first regulating pump is used to extract gas from the inside of the plurality of first spiral tubes, and the second regulating pump is used to supply gas to the plurality of second spiral tubes.

2. The oil-gas separation device for a helium refrigerator according to claim 1, characterized in that: The first regulating pump and the second regulating pump are both provided with a cooler, and the cooler is used to ensure that the first regulating pump and the second regulating pump blow out low-temperature gas.

3. The oil-gas separation device for a helium refrigerator according to claim 1, characterized in that: The adjustment component also includes a winding roller and an unwinding roller, both of which are rotatably connected to the separation cylinder, and a first through groove and a second through groove are provided on the side wall of the first-level collecting cylinder. One end of the collecting film is wound on the winding roller through the first through groove, and the other end of the collecting film is wound on the unwinding roller through the second through groove; a power source for driving the winding roller and the unwinding roller to rotate is provided on the separation cylinder.

4. The oil-gas separation device for a helium refrigerator according to claim 3, characterized in that: A new collecting film is wound on the unwinding roller. When the oil accumulated on the collecting film in the collecting chamber reaches a first preset level, the winding roller winds up the collecting film in the collecting chamber, and the unwinding roller releases the new collecting film into the collecting chamber.

5. The oil-gas separation device for a helium refrigerator according to claim 3, characterized in that: A flow velocity detector is provided on the air duct, which is used to detect the speed of the spiral flow of gas in the collecting chamber; the adjustment component also includes a control board, which is used to receive data from the flow velocity detector; the control board can control the winding roller and the unwinding roller to simultaneously wind up the collecting film when the data from the flow velocity detector is less than a first preset value.

6. The oil-gas separation device for a helium refrigerator according to claim 1, characterized in that: The spoiler is a spiral plate, which is spirally arranged around the outer wall of the air guide pipe.

7. The oil-gas separation device for a helium refrigerator according to claim 1, characterized in that: The collecting membrane is an elastic film, and the material of the collecting membrane is polytetrafluoroethylene with oleophobic properties.

8. The oil-gas separation device for a helium refrigerator according to claim 1, characterized in that: It also includes a secondary collecting cylinder, which is installed at the air outlet. The residual oil in the gas can be intercepted by the secondary collecting cylinder when it leaves the separation cylinder.

9. A method for separating oil and gas for a helium refrigerator, using the oil and gas separation device for a helium refrigerator according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, transporting the gas containing oil to the collecting chamber through the air inlet pipe; S2, under the action of the spoiler, the gas flows spirally in the collecting chamber; S3, adjusting the profile of the collecting membrane during the process of the oil adhering to the collecting membrane.

Images