Supercritical extraction device with flow control structure

Abstract

The invention relates to a supercritical extraction device with a flow control structure applied to the related field of extraction, through the arrangement of a pressure relief pipe, when supercritical fluid is discharged after being vaporized, a pressure relief flow control unit in the pressure relief pipe can radially float along with the action of air pressure, and then the effect of consuming part of pressure is achieved; on the other hand, during pressure relief, due to floating of the pressure relief flow control unit, part of gas can directly enter the pre-reinforcing unit, thrust is generated on an inner variable bag in the pre-reinforcing unit, and the inner variable bag is compacted and hardened in the pre-reinforcing unit, so that the inner variable bag can be embedded into an embedded ring groove, and the pressure at the joint of the exhaust pipe, the joint pipe and the pressure relief pipe is effectively dispersed; the connecting positions of the pressure relief pipe, the exhaust pipe and the connector pipe are reinforced, then the stability is improved, the higher the air pressure is, the better the reinforcing effect is, compared with the prior art, the pipeline connector position is effectively protected, the situations of air leakage, falling and the like are reduced, and the supercritical extraction process is stably carried out.

Description

Technical Field

[0001] The present invention relates to a supercritical extraction device with a flow control structure, and in particular to a supercritical extraction device with a flow control structure applied in extraction-related fields. Background Art

[0002] Supercritical fluid is a state of matter between gas and liquid, neither gas nor liquid. This substance can only exist when its temperature and pressure exceed the critical point. Supercritical fluid has a high density, similar to that of liquid, while its viscosity is closer to that of gas. Therefore, supercritical fluid is an ideal extraction agent.

[0003] After extraction using carbon dioxide supercritical fluid, it is necessary to reduce pressure and increase temperature to restore the supercritical fluid to a gaseous state, and then separate it from the extract to complete the extraction. For example, Chinese Patent Specification No. CN116712751A discloses a pharmaceutical entrainment-controlled flow supercritical extraction device, and Chinese Patent Specification No. CN110743193B discloses a supercritical extraction process that simulates ultrasonic high-speed separation. However, in this process, when the supercritical fluid is restored to a gaseous state, the pressure fluctuates greatly, and the gas carries a large pressure, which will cause a large impact force on the interface between the separation tank and the exhaust pipe, causing the interface to be easily damaged, cracking and leaking before the expected service life. In severe cases, the pipe may even fall off, seriously affecting the stability of the supercritical extraction process. Summary of the Invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when the supercritical fluid vaporizes and separates from the extract, the pipeline interface will be subjected to a large pressure, which will shorten its life and make it easy to be damaged.

[0005] To solve the above problems, the present invention provides a supercritical extraction device with a flow control structure, comprising an extraction tank, a separation tank and a gas recovery tank, wherein a gas supply pipe is fixedly connected to the upper end of the extraction tank, a liquid guide pipe is fixedly connected between the extraction tank and the separation tank, a pressure relief pipe is provided at the upper end of the separation tank, an exhaust pipe is fixedly connected between the pressure relief pipe and the gas recovery tank, and a return gas pipe is fixedly connected between the upper outer end of the gas recovery tank and the outer end of the extraction tank;

[0006] An interface pipe is fixedly connected to the upper end of the separation tank, and the upper and lower ends of the pressure relief pipe are threadedly connected to the exhaust pipe and the interface pipe respectively, and the ends of the exhaust pipe and the interface pipe extend into the interior of the pressure relief pipe, and a flow control ring is fixedly connected to the middle of the pressure relief pipe. The top and bottom ends of the pressure relief pipe are fixedly connected to the pre-reinforcement unit, and the inside of the pressure relief pipe is also fixedly connected with two internal connecting linings corresponding to the interface pipe and the exhaust pipe ends respectively. The internal connecting lining includes an internal connecting spiral ring threadedly connected to the corresponding interface pipe or exhaust pipe and a connecting rod fixedly connected between the internal connecting spiral ring and the inner wall of the pressure relief pipe. A plurality of embedded ring grooves are cut out at the outer end between the exhaust pipe and the end of the pressure relief pipe and the two threaded connection points of the internal connecting spiral ring. A plurality of embedded ring grooves are also cut out at the outer end between the interface pipe and the end of the pressure relief pipe and the two threaded connection points of the internal connecting spiral ring. The plurality of embedded ring grooves correspond to the two pre-reinforcement units respectively.

[0007] In the above-mentioned supercritical extraction device with a flow control structure, the pressure relief pipe is set up so that when the supercritical fluid is discharged after vaporization, it can be subjected to a certain pressure relief effect in the pressure relief pipe before continuing to be discharged. At the same time, during pressure relief, the gas pressure can be used to reversely squeeze the pre-reinforcement unit, thereby strengthening the stability of the connection between the pressure relief pipe and the exhaust pipe, as well as the interface pipe. Compared with the existing technology, it effectively protects the pipeline interface, reduces leakage, falling off, etc., and ensures the stability of the supercritical extraction process.

[0008] As a further improvement of the present application, the pre-reinforcement unit includes an outer cover shell and an internal variable bag placed inside the outer cover shell. The lower end of the outer cover shell is fixedly connected to a plurality of air guide ports, and the plurality of air guide ports are all communicated with the interior of the outer cover shell. The interior of the internal variable bag is saturated with a non-Newtonian fluid, and the volume of the internal variable bag is not less than 90% of the internal space of the outer cover shell.

[0009] As a further improvement of the present application, the outer cover shell is a hollow shell structure, and the cross-section of the outer cover shell is C-shaped. The end of the inner variable bag crosses the C-shaped mouth of the outer cover shell and contacts the outer end of the pressure relief pipe.

[0010] As a further improvement of the present application, the flow control ring includes an outer fixed ring fixedly connected to the inner wall of the pressure relief pipe and a plurality of pressure relief flow control units respectively fixedly connected to the inner wall of the outer fixed ring.

[0011] As a further improvement of the present application, the pressure relief and flow control unit includes a ring petal and a pressure relief layer fixedly connected between the ring petal and the outer fixed ring. The pressure relief layer is made of elastic material. Multiple ring petals are assembled into a complete ring shape. The ring is coaxially arranged with the pressure relief pipe and the exhaust pipe, and the upper and lower ends of the ring are in contact with the end faces of the exhaust pipe and the interface pipe at the same time. The two adjacent pressure relief layers do not contact each other.

[0012] As another improvement of the present application, the pressure relief and flow control unit includes a plurality of arc-shaped pressure plates distributed in a ring array, a triangular pad fixedly connected between one end of the arc-shaped pressure plate close to the inner wall of the outer fixed ring and the outer fixed ring, and a limiting arc plate fixedly connected to the inner wall of the triangular pad, the triangular pad and the limiting arc plate are in contact with each other, and the ends of two adjacent arc-shaped pressure plates are in contact with each other.

[0013] As another improved supplement to the present application, the triangular pad is made of elastic material, the limiting arc piece is a hard arc surface structure, and when the triangular pad is compressed to be flush with the surface of the limiting arc piece, the arc-shaped pressing plate and the limiting arc piece fit and contact each other.

[0014] As another improvement of the present application, a self-resetting switch is installed on the surface of the limiting arc piece. The limiting arc piece is made of electromagnetic material, and the self-resetting switch is used to control the power on and off of the limiting arc piece. The arc pressure piece is made of magnetic material, and the limiting arc piece generates a magnetic repulsive force on the arc pressure piece after power is turned on.

[0015] In summary, by setting up the pressure relief pipe, when the supercritical fluid is discharged after vaporization, the pressure relief flow control unit in the pressure relief pipe will float radially with the action of the air pressure, thereby consuming part of the pressure, and effectively dispersing the pressure at the connection between the exhaust pipe and the interface pipe and the pressure relief pipe. On the other hand, during pressure relief, due to the floating of the pressure relief flow control unit, part of the gas can directly enter the pre-reinforcement unit, thereby generating a thrust on the internal variable bag inside it, making it dense in the pre-reinforcement unit and hardening at the same time, so that it can be embedded in the embedded annular groove, so that the connection between the pressure relief pipe and the exhaust pipe and the interface pipe is reinforced, thereby improving stability. The greater the air pressure, the better the reinforcement effect. Compared with the existing technology, it effectively protects the pipeline interface, reduces leakage, falling off, etc., and ensures the stability of the supercritical extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a left side perspective view of the first embodiment of the present application;

[0017] Figure 2 This is a right side perspective view of the first embodiment of the present application;

[0018] Figure 3 A top view of the first embodiment of the present application;

[0019] Figure 4 This is a cross-sectional view of the pressure relief pipe according to the first embodiment of the present application;

[0020] Figure 5 This is a cross-sectional view of the pre-reinforcement unit according to the first embodiment of the present application;

[0021] Figure 6 This is a cross-sectional view of the pre-reinforcement unit of the first embodiment of the present application during reinforcement;

[0022] Figure 7 This is a schematic diagram of the first embodiment of the present application when pressure is released in the pressure relief pipe;

[0023] Figure 8 This is a cross-sectional view of the pressure relief and flow control unit according to the first embodiment of the present application;

[0024] Figure 9 This is a schematic diagram of the pressure relief and flow control unit during pressure relief according to the first embodiment of the present application;

[0025] Figure 10 This is a schematic diagram of a pressure relief and flow control unit according to a second embodiment of the present application;

[0026] Figure 11 This is a schematic diagram of the pressure relief and flow control unit during pressure relief according to the second embodiment of the present application.

[0027] Description of the numbers in the figure:

[0028] 1 extraction tank, 2 separation tank, 3 gas recovery tank, 101 liquid guide tube, 102 exhaust pipe, 103 return air pipe, 4 pressure relief pipe, 401 internal connecting screw ring, 402 connecting rod, 403 embedded ring groove, 5 pre-reinforcement unit, 51 outer cover shell, 52 inner variable bag, 501 air guide port, 6 flow control ring, 61 outer fixed ring, 62 pressure relief layer, 63 ring petal, 601 arc pressure piece, 602 triangular pad, 603 limit arc piece. DETAILED DESCRIPTION

[0029] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0030] The first implementation method:

[0031] Figure 1-2 A supercritical extraction device with a flow control structure is shown, comprising an extraction tank 1, a separation tank 2 and a gas recovery tank 3. The upper end of the extraction tank 1 is fixedly connected to a gas supply pipe, a liquid guide pipe 101 is fixedly connected between the extraction tank 1 and the separation tank 2, a pressure relief pipe 4 is provided at the upper end of the separation tank 2, an exhaust pipe 102 is fixedly connected between the pressure relief pipe 4 and the gas recovery tank 3, and a return gas pipe 103 is fixedly connected between the upper outer end of the gas recovery tank 3 and the outer end of the extraction tank 1. Figure 3During extraction, first put the slices of the object to be extracted into the extraction tank 1 and introduce CO2, then control the temperature at 31.2-50℃ and the pressure at 7.39MP to make the CO2 in a fluid state, thereby extracting the slices, and then pass the CO2 fluid carrying the target extract into the separation tank 2 along the liquid guide tube 101, and then perform the operation of reducing pressure and raising temperature to make the CO2 fluid gradually vaporize into a gaseous state, and then automatically separate from the target extract, and the separated CO2 gas is passed into the gas recovery tank 3 along the exhaust pipe 102 for recovery, and then flows back to the extraction tank 1 along the return gas pipe 103 to replenish the CO2 gas.

[0032] like Figure 4 , the upper end of the separation tank 2 is fixedly connected with an interface pipe, and the upper and lower ends of the pressure relief pipe 4 are respectively threadedly connected with the exhaust pipe 102 and the interface pipe, wherein the inner diameter of the pressure relief pipe 4 is 3-5 times the inner diameter of the exhaust pipe 102 and the interface pipe, thereby making the overflowing gas enter the pressure relief pipe 4. The accommodating space becomes larger and can play a certain pressure relief role, and the ends of the exhaust pipe 102 and the interface pipe are extended to the inside of the pressure relief pipe 4, and the middle part of the pressure relief pipe 4 is fixedly connected with a flow control ring 6, and the top and bottom ends of the pressure relief pipe 4 are fixedly connected. The pre-reinforcement unit 5 is provided with the pressure relief pipe 4 so that when the supercritical fluid is discharged after vaporization, it can be subjected to a certain pressure relief effect in the pressure relief pipe 4 before it can continue to be discharged. At the same time, when the pressure is released, the gas pressure can be used to reversely squeeze the pre-reinforcement unit 5, thereby strengthening the stability of the connection between the pressure relief pipe 4 and the exhaust pipe 102 and the interface pipe. Compared with the existing technology, it effectively protects the pipeline interface, reduces leakage, falling off, etc., and ensures the stability of the supercritical extraction process. The exhaust pipe 102 and the pressure relief pipe are connected. A plurality of embedded annular grooves 403 are cut out at the outer end between the end of the pipe 4 and the two threaded connection points of the inner spiral ring 401. A plurality of embedded annular grooves 403 are also cut out at the outer end between the interface pipe and the end of the pressure relief pipe 4 and the two threaded connection points of the inner spiral ring 401. The plurality of embedded annular grooves 403 correspond to the two pre-reinforcement units 5 respectively, so that the contact relationship between the pre-reinforcement unit 5 and the embedded annular groove 403 can change between soft and hard before and after the force is applied. Under the action of gas pressure, hard contact can be presented, thereby achieving limited reinforcement. In order to achieve the effect, the pressure relief pipe 4 is further fixedly connected with two inner connecting lining plates corresponding to the end of the interface pipe and the exhaust pipe 102 respectively. The inner connecting lining plate includes an inner connecting screw ring 401 threadedly connected to the corresponding interface pipe or exhaust pipe 102 and a connecting rod 402 fixedly connected between the inner connecting screw ring 401 and the inner wall of the pressure relief pipe 4, wherein the inner connecting lining plate is used to increase the range of the threaded connection between the exhaust pipe 102 and the interface pipe and the pressure relief pipe 4, thereby further strengthening the connection between the two and the pressure relief pipe 4.

[0033] like Figure 5The pre-reinforcement unit 5 includes an outer cover shell 51 and an inner variable bag 52 placed inside the outer cover shell 51. The lower end of the outer cover shell 51 is fixedly connected to a plurality of air guide ports 501. The plurality of air guide ports 501 are all communicated with the interior of the outer cover shell 51. The interior of the inner variable bag 52 is saturated with a non-Newtonian fluid, and the volume of the inner variable bag 52 is not less than 90% of the internal space of the outer cover shell 51, effectively ensuring that it can fully contact the outer wall of the exhaust pipe 102 or the interface pipe when subjected to force, thereby improving the reinforcement effect. The outer cover shell 51 is a hollow shell structure, and the cross-section of the outer cover shell 51 is C-shaped. The end of the inner variable bag 52 crosses the C-shaped mouth of the outer cover shell 51 and contacts the outer end of the pressure relief pipe 4.

[0034] like Figure 8 The flow control ring 6 includes an outer fixed ring 61 fixedly connected to the inner wall of the pressure relief pipe 4 and a plurality of pressure relief flow control units fixedly connected to the inner wall of the outer fixed ring 61. The pressure relief flow control unit includes a ring petal 63 and a pressure relief layer 62 fixedly connected between the ring petal 63 and the outer fixed ring 61. The pressure relief layer 62 is made of elastic material. The plurality of ring petals 63 are assembled into a complete ring. The ring is coaxially arranged with the pressure relief pipe 4 and the exhaust pipe 102, and the upper and lower ends of the ring are in contact with the end faces of the exhaust pipe 102 and the interface pipe at the same time. The two adjacent pressure relief layers 62 do not contact each other.

[0035] like Figure 9 When the vaporized carbon dioxide gas enters the pressure relief pipe 4, it will produce a radial outward squeezing force on the flow control ring 6, thereby causing it to expand. Figure 7 , thereby separating the flow control ring 6 from the exhaust pipe 102 and the end face of the interface pipe, so that the inner and outer spaces of the ring petal 63 are connected, and thus part of the gas can directly cross the ring petal 63 and spread toward the two pre-reinforcement units 5, as shown in FIG. Figure 6 , so that it can enter the outer cover shell 51 along the air guide port 501, and this part of the gas can directly produce an extrusion pressure on the inner variable capsule 52, so that it is compacted, and the surface of the inner variable capsule 52 can fully stick to the exhaust pipe 102 and the inner wall of the embedded annular groove 403. At the same time, when subjected to force, the inner variable capsule 52 quickly hardens, thereby establishing a reinforcement layer between the inner variable capsule 52 and the exhaust pipe 102 again, so that the exhaust pipe 102 is limited by the embedded annular groove 403 and the hardened 502, making it difficult for the pressure relief pipe 4 to move relative to the interface pipe, and the exhaust pipe 102 to move relative to the pressure relief pipe 4, thereby effectively ensuring the stability of the place, effectively avoiding the situation where the pipeline falls off due to air pressure, and effectively ensuring the stable progress of the extraction process.

[0036] In summary, through the setting of the pressure relief pipe 4, when the supercritical fluid is discharged after vaporization, the pressure relief flow control unit in the pressure relief pipe 4 will float radially with the action of the air pressure, thereby consuming part of the pressure, and effectively dispersing the pressure at the connection between the exhaust pipe 102 and the interface pipe and the pressure relief pipe 4. On the other hand, during pressure relief, due to the floating of the pressure relief flow control unit, part of the gas can directly enter the pre-reinforcement unit 5, thereby generating a thrust on the internal variable bag 52 therein, making it dense in the pre-reinforcement unit 5 and hardening at the same time, so that it can be embedded in the embedded annular groove 403, so that the connection between the pressure relief pipe 4 and the exhaust pipe 102 and the interface pipe is reinforced, thereby improving stability. The greater the air pressure, the better the reinforcement effect. Compared with the existing technology, it effectively protects the pipeline interface, reduces leakage, falling off, etc., and ensures the stability of the supercritical extraction process.

[0037] The second implementation method:

[0038] This embodiment is based on the first embodiment, and changes the specific configuration of the pressure relief and flow control unit, while the rest remains consistent with the first embodiment.

[0039] like Figure 10 The pressure relief and flow control unit includes a plurality of arc-shaped pressing sheets 601 distributed in a ring array, a triangular pad 602 fixedly connected between one end of the arc-shaped pressing sheet 601 close to the inner wall of the outer fixed ring 61 and the outer fixed ring 61, and a limiting arc sheet 603 fixedly connected to the inner wall of the triangular pad 602. The triangular pad 602 and the limiting arc sheet 603 are in contact with each other, and the ends of two adjacent arc-shaped pressing sheets 601 are in contact with each other. The triangular pad 602 is made of elastic material, and the limiting arc sheet 603 is a hard arc surface structure. When the triangular pad 602 is compressed to be flush with the surface of the limiting arc sheet 603, the arc-shaped pressing sheet 601 and the limiting arc sheet 603 fit and contact each other.

[0040] When the vaporized CO2 gas enters the pressure relief pipe 4, under other effects, it can push multiple arc-shaped pressing plates 601, and then the arc-shaped pressing plates 601 rotate with the triangular pad 602 as the force point. At this time, the triangular pad 602 is compressed, causing the multiple arc-shaped pressing plates 601 to separate and expand from each other, which can also achieve the pressure relief effect. In this embodiment, the expansion method of the pressure relief flow control unit is similar to unscrewing, and rotational extrusion occurs at the force point. Compared with the radial vertical force of the first embodiment, it is easier to expand and the pressure relief effect is better.

[0041] The third implementation method:

[0042] This embodiment is further improved on the basis of the second embodiment, and the rest of the embodiment is consistent with the second embodiment.

[0043] A self-resetting switch is installed on the surface of the limiting arc piece 603. The limiting arc piece 603 is made of electromagnetic material, and the self-resetting switch is used to control the power on and off of the limiting arc piece 603. The arc pressing piece 601 is made of magnetic material, and the limiting arc piece 603 generates a magnetic repulsive force on the arc pressing piece 601 after power is turned on.

[0044] Under the action of air pressure, the arc-shaped pressing piece 601 continuously squeezes the triangular pad 602, which is compressed until the arc-shaped pressing piece 601 conflicts with the limiting arc piece 603. At this time, the self-resetting switch can be triggered to energize the limiting arc piece 603, thereby generating a reverse thrust on the arc-shaped pressing piece 601. On the one hand, the thrust is opposite to the direction of the air pressure force, which can offset part of it and improve the pressure relief effect. At the same time, it can also make the arc-shaped pressing piece 601 move away from the limiting arc piece 603. As the gas continues to act, the above process is constantly repeated, thereby making the arc-shaped pressing piece 601 in a floating state, thereby greatly improving the pressure relief effect on the gas, and further improving the stability at the exhaust port of the separation tank 2.

[0045] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A supercritical extraction device with a flow control structure, characterized in that: The invention comprises an extraction tank (1), a separation tank (2) and a gas recovery tank (3), wherein the upper end of the extraction tank (1) is fixedly connected to a gas supply pipe, a liquid guide pipe (101) is fixedly connected between the extraction tank (1) and the separation tank (2), a pressure relief pipe (4) is provided at the upper end of the separation tank (2), an exhaust pipe (102) is fixedly connected between the pressure relief pipe (4) and the gas recovery tank (3), and a gas return pipe (103) is fixedly connected between the upper outer end of the gas recovery tank (3) and the outer end of the extraction tank (1); The upper end of the separation tank (2) is fixedly connected to a mouthpiece, and the upper and lower ends of the pressure relief pipe (4) are respectively threadedly connected to the exhaust pipe (102) and the mouthpiece, and the ends of the exhaust pipe (102) and the mouthpiece extend into the interior of the pressure relief pipe (4). The middle of the pressure relief pipe (4) is fixedly connected to a flow control ring (6), and the top and bottom ends of the pressure relief pipe (4) are fixedly connected to a pre-reinforcement unit (5). The pressure relief pipe (4) is also fixedly connected to two inner connection lining discs corresponding to the mouthpiece and the ends of the exhaust pipe (102), and the inner connection lining discs include corresponding mouthpieces or exhaust pipes. An inner connecting screw ring (401) threadedly connected to the air pipe (102) and a connecting rod (402) fixedly connected between the inner connecting screw ring (401) and the inner wall of the pressure relief pipe (4); a plurality of inner ring grooves (403) are cut at the outer end between the exhaust pipe (102) and the end of the pressure relief pipe (4) and the two threaded connection points of the inner connecting screw ring (401); a plurality of inner ring grooves (403) are also cut at the outer end between the interface pipe and the end of the pressure relief pipe (4) and the two threaded connection points of the inner connecting screw ring (401); the plurality of inner ring grooves (403) respectively correspond to the two pre-reinforcement units (5).

2. The supercritical extraction device with a flow control structure according to claim 1, characterized in that: The pre-reinforcement unit (5) comprises an outer cover shell (51) and an inner variable capsule (52) placed inside the outer cover shell (51); a plurality of air guide ports (501) are fixedly connected to the lower end of the outer cover shell (51); the plurality of air guide ports (501) are all in communication with the interior of the outer cover shell (51); the interior of the inner variable capsule (52) is saturated with a non-Newtonian fluid, and the volume of the inner variable capsule (52) is not less than 90% of the internal space of the outer cover shell (51).

3. The supercritical extraction device with a flow control structure according to claim 2, characterized in that: The outer cover shell (51) is a hollow shell structure, and the cross section of the outer cover shell (51) is C-shaped. The end of the inner variable bag (52) crosses the C-shaped mouth of the outer cover shell (51) and contacts the outer end of the pressure relief pipe (4).

4. The supercritical extraction device with a flow control structure according to claim 1, characterized in that: The flow control ring (6) comprises an outer fixed ring (61) fixedly connected to the inner wall of the pressure relief pipe (4) and a plurality of pressure relief flow control units respectively fixedly connected to the inner wall of the outer fixed ring (61).

5. The supercritical extraction device with a flow control structure according to claim 4, characterized in that: The pressure relief flow control unit comprises a ring petal (63) and a pressure relief layer (62) fixedly connected between the ring petal (63) and the outer fixed ring (61); the pressure relief layer (62) is made of elastic material; a plurality of the ring petals (63) are assembled into a complete ring; the ring is coaxially arranged with the pressure relief pipe (4) and the exhaust pipe (102); and the upper and lower ends of the ring are in contact with the end faces of the exhaust pipe (102) and the interface pipe at the same time; and two adjacent pressure relief layers (62) do not contact each other.

6. The supercritical extraction device with a flow control structure according to claim 4, characterized in that: The pressure relief and flow control unit comprises a plurality of arc-shaped pressing sheets (601) distributed in a ring array, a triangular pad (602) fixedly connected between one end of the arc-shaped pressing sheet (601) close to the inner wall of the outer fixed ring (61) and the outer fixed ring (61), and a limiting arc sheet (603) fixedly connected to the inner wall of the triangular pad (602), wherein the triangular pad (602) and the limiting arc sheet (603) are in contact with each other, and the ends of two adjacent arc-shaped pressing sheets (601) are in contact with each other.

7. The supercritical extraction device with a flow control structure according to claim 6, characterized in that: The triangular pad (602) is made of elastic material, the limiting arc piece (603) is a hard arc surface structure, and when the triangular pad (602) is compressed to be flush with the surface of the limiting arc piece (603), the arc-shaped pressing piece (601) and the limiting arc piece (603) fit and contact each other.

8. The supercritical extraction device with a flow control structure according to claim 7, characterized in that: A self-resetting switch is mounted on the surface of the limiting arc piece (603). The limiting arc piece (603) is made of electromagnetic material, and the self-resetting switch is used to control the on and off of the limiting arc piece (603). The arc-shaped pressing piece (601) is made of magnetic material, and the limiting arc piece (603) generates a magnetic repulsive force on the arc-shaped pressing piece (601) when energized.

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