Pyrethrum extraction device

Abstract

The invention relates to the technical field of extraction devices, and discloses a pyrethrum extraction device which comprises a funnel-shaped structure arranged at the bottom end of an extraction cavity, a gas nozzle, a gas heating type flowing structure and an elastic gas pressure driving structure. According to the pyrethrum extraction device, the gas above the extraction liquid raw material can be sucked to pass through the high-temperature area, so that the flowing gas is subjected to high-temperature heating work, and then the heated gas is discharged to the bottom of the extraction liquid raw material; the high-temperature gas flows in the extraction liquid raw material from bottom to top in the form of bubbles under the action of buoyancy, and the flowing bubbles can transfer heat to the middle area of the extraction liquid raw material, so that the heating efficiency of the extraction liquid raw material is improved, meanwhile, the flowing bubbles can turbulence pyrethrum solid particles located in the extraction liquid, and the pyrethrum solid particles are separated from the extraction liquid. The flowing capacity of pyrethrum solid particles in the extraction liquid is accelerated, so that the extraction efficiency of the extraction solvent on the pyrethrum is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of extraction devices, in particular to a pyrethrum extraction device. Background Art

[0002] In the prior art, the extraction of pyrethrum plants is carried out in an intermittent manner, that is, the extraction is carried out in a single tank. The extraction device includes an extraction tank, an inlet pipe is installed above the tank, a liquid outlet pipe is installed below the tank, and stop valves are installed on the inlet pipe and the liquid outlet pipe. When performing the extraction work, the raw material is first loaded into the extraction tank, and then the extraction solvent is added. After the raw material is soaked in the solvent for a certain period of time, an extract is formed. The extract is put in through the liquid outlet pipe and transported to the concentration process for concentration, and the solvent is recycled; after the raw material is soaked and extracted once, it is put into a new solvent for a second soaking, and the extract of the second soaking is put in through the liquid outlet pipe and transported to the concentration process for concentration, and the solvent is recycled; the raw material after the second extraction is also put into a new solvent for a third soaking, and the extract of the third soaking is put in through the liquid outlet pipe and transported to the concentration process for concentration, and the solvent is recycled. After the raw material is soaked three times, it is discharged as residue. In the prior art, multiple extraction tanks are often used in parallel for production to increase product output.

[0003] In order to reduce the number of solvent concentration and recovery and shorten the production cycle, the Chinese utility model patent with the publication number "CN 201823338 U" announced "a device for circulating extraction of pyrethrum plants", whose main structure includes four extraction tanks, namely tank A, tank B, tank C and tank D, each of which is equipped with a liquid inlet pipe and a liquid outlet pipe, and a stop valve is installed on the liquid inlet pipe and the liquid outlet pipe. The liquid inlet pipe on the extraction tank is connected to the solvent inlet pipe, and the liquid outlet pipe on the extraction tank is connected to the solvent outlet pipe. There are stop valves on the solvent inlet pipe and the solvent outlet pipe. There is also a solvent circulation pipe between the solvent inlet pipe and the solvent outlet pipe, and there is a stop valve and a high-pressure pump on the solvent circulation pipe. The above-mentioned device for circulating extraction of pyrethrum plants can realize the circulation of the extraction solvent between the four extraction tanks by controlling the working state of the stop valve and the high-pressure pump. By controlling the circulating flow program of the solvent, the continuous cycle of the extraction work can be realized, the amount of solvent used can be reduced, the production cycle can be shortened, and the product quality can be improved.

[0004] From the above description, it can be known that the above-mentioned device for cyclic extraction of pyrethrum plants realizes a continuous cycle of extraction work through a circulating flow program between four extraction tanks. It does not have any improvement over a single extraction tank, and the factors affecting the pyrethrum extraction efficiency include the structural characteristics of the extraction tank. Therefore, it still has the disadvantage of low extraction. Summary of the invention

[0005] (I) Technical problems solved In view of the deficiencies in the prior art, the present invention provides a pyrethrum extraction device, which improves the structure of the extraction tank and utilizes a built-in elastic air pressure drive structure to perform a cyclic guiding function on the high-pressure gas inside the extraction cavity, so that the gas located above the extraction liquid raw material can be sucked through the high-temperature area, thereby performing high-temperature heating on the flowing gas, and then the heated gas is discharged to the bottom of the extraction liquid raw material. Under the action of buoyancy, the high-temperature gas flows in the extraction liquid raw material from bottom to top in the form of bubbles. The flowing bubbles can transfer heat to the middle area of ​​the extraction liquid raw material, thereby accelerating the heating efficiency of the extraction liquid raw material. At the same time, the flowing bubbles can also cause turbulence to the pyrethrum solid particles located inside the extraction liquid, thereby accelerating the flow ability of the pyrethrum solid particles in the extraction liquid, thereby further accelerating the extraction efficiency of the extraction solvent on pyrethrum, thereby solving the above-mentioned technical problems.

[0006] (II) Technical solution In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a pyrethrum extraction device, comprising a longitudinal extraction tank with supporting legs installed at the bottom of the circumferential surface, an extraction cavity arranged inside the longitudinal extraction tank, an annular heating cavity arranged on the periphery of the circumferential surface of the extraction cavity and not connected to each other, a gas limiting cavity arranged at the top of the extraction cavity, a raw material delivery channel arranged at the top of the longitudinal extraction tank and used for delivering extraction raw materials into the gas limiting cavity, a finished product discharge channel arranged at the bottom of the longitudinal extraction tank and used for finished product discharge, an upper valve body and a lower valve body respectively installed in the raw material delivery channel and the finished product discharge channel and used for controlling the flow of the medium, a high-temperature steam inlet channel and a steam discharge channel arranged on the side of the longitudinal extraction tank and connected to the annular heating cavity, and a gas connection arranged at the top of the longitudinal extraction tank and used for an external air pump to inject gas into the extraction cavity. A channel, a thermometer installed inside the longitudinal extraction tank and used to monitor the temperature inside the extraction cavity, and a pressure gauge installed inside the longitudinal extraction tank and used to monitor the pressure inside the extraction cavity, and also includes a funnel-shaped structure arranged at the bottom end of the extraction cavity, and the interior of the funnel-shaped structure is equipped with a plurality of annular array-type gas nozzles for gas to enter the extraction cavity in the form of a jet from the annular heating cavity; a gas heating flow structure, in which an annular partition is arranged to divide the annular heating cavity into an upper half and a lower half, and a longitudinal copper tube and a transverse copper tube for gas to flow from the gas limiting cavity to the bottom of the extraction cavity; and an elastic gas pressure driving structure, in which an annular elastic gas film is arranged to divide the bottom area of ​​the annular heating cavity into an upper half and a lower half, and a limiting telescopic rod that passes through the bottom structure of the longitudinal extraction tank and can drive the annular elastic gas film to deform.

[0007] Preferably, the high-temperature steam inlet channel and the steam exhaust channel are symmetrically arranged at the locations of the two farthest points in the annular heating chamber.

[0008] Preferably, the gas-heating flow structure includes an annular partition clamped inside the annular heating chamber, the inner and outer annular surfaces of the annular partition are embedded with annular sealing rings to prevent gas from flowing along the installation gap, the annular plate body of the annular partition is fixedly installed with a plurality of longitudinal copper tubes, and a transverse copper tube is installed at the top of each longitudinal copper tube, which passes through the longitudinal extraction tank and has one end extending to the inside of the gas limiting chamber, and the interiors of the longitudinal copper tubes and the transverse copper tubes are provided with a gas flow channel for gas to flow from the gas limiting chamber to the bottom of the extraction cavity, and the longitudinal copper tube is installed with a gas one-way valve at the bottom port of the gas flow channel.

[0009] Preferably, the level of the annular partition is lower than the level of the steam exhaust channel and higher than the level of the gas nozzle.

[0010] Preferably, the gas one-way valve has its air inlet direction toward the transverse copper tube, and its exhaust port toward the lower space of the gas flow channel.

[0011] Preferably, the elastic pneumatic driving structure comprises an inner annular body embedded in the inner ring of the annular heating chamber and an outer annular body embedded in the outer ring of the annular heating chamber, a middle annular body is placed in the central area of ​​the inner annular body and the outer annular body, annular elastic air films are correspondingly embedded between the outer annular surface of the inner annular body and the inner annular surface of the middle annular body and between the inner annular surface of the outer annular body and the outer annular surface of the middle annular body, a plurality of limiting telescopic rods penetrating the bottom structure of the longitudinal extraction tank are fixedly installed at the bottom end of the middle annular body, the bottom end of the limiting telescopic rod is fixedly installed on the upper end surface of a bottom annular body, and a transverse connecting plate structure is provided on one side of the bottom annular body.

[0012] Preferably, the annular elastic air membrane is an annular structure made of a material that can undergo elastic deformation and is resistant to high temperatures.

[0013] Preferably, the level of the annular elastic air film is lower than the level of the gas nozzle and higher than the level of the bottom end of the annular heating chamber.

[0014] Preferably, it also includes a hydraulic telescopic structure that can drive the longitudinal height of the transverse connecting plate structure, the hydraulic telescopic structure includes a longitudinal column fixedly installed on the transverse part of the supporting leg, the interior of the longitudinal column is provided with a longitudinal active cavity, the top of the longitudinal active cavity is provided with a liquid limiting flow cavity, the interior of the longitudinal column is provided with a hydraulic oil inlet channel for injecting hydraulic oil into the liquid limiting flow cavity and a hydraulic oil discharge channel for discharging liquid from the liquid limiting flow cavity to the outside, a piston body that can move longitudinally is placed inside the longitudinal active cavity, a telescopic rod that passes through the bottom end structure of the longitudinal column is installed at the bottom end of the piston body, a coil spring that drives the piston body to reset is installed at the periphery of the longitudinal active cavity, and a fixing plate fixed to the upper surface of the transverse connecting plate structure is installed at the bottom end of the telescopic rod.

[0015] Preferably, the movable range of the piston body is consistent with the movable range of the annular elastic air film inside the annular heating chamber.

[0016] Compared with the prior art, the present invention provides a pyrethrum extraction device, which has the following beneficial effects: The pyrethrum extraction device improves the structure of the extraction tank and utilizes a built-in elastic air pressure driving structure to perform a cyclic guiding function on the high-pressure gas inside the extraction cavity, so that the gas located above the extraction liquid raw material can be sucked through the high-temperature area, thereby performing high-temperature heating on the flowing gas, and then the heated gas is discharged to the bottom of the extraction liquid raw material. The high-temperature gas flows from bottom to top in the extraction liquid raw material in the form of bubbles under the action of buoyancy. The flowing bubbles can transfer heat to the middle area of ​​the extraction liquid raw material, thereby accelerating the heating efficiency of the extraction liquid raw material. At the same time, the flowing bubbles can also cause turbulence to the pyrethrum solid particles located inside the extraction liquid, thereby accelerating the flow ability of the pyrethrum solid particles in the extraction liquid, thereby further accelerating the extraction efficiency of the extraction solvent on pyrethrum. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the full cross-section structure of the present invention; Figure 2 A three-dimensional diagram of a gas-heating flow structure in the present invention; Figure 3 It is a three-dimensional cross-sectional view of the gas heating flow structure of the present invention; Figure 4 It is a three-dimensional diagram of the elastic gas pressure driving structure of the present invention; Figure 5 It is a three-dimensional diagram of the hydraulic telescopic structure of the present invention; Figure 6 It is a three-dimensional cross-sectional view of the hydraulic telescopic structure of the present invention.

[0018] Among them: 1. Longitudinal extraction tank; 2. Support legs; 3. Extraction cavity; 4. Annular heating cavity; 5. Gas limiting cavity; 6. Raw material delivery channel; 7. Upper valve body; 8. Finished product discharge channel; 9. Lower valve body; 10. Funnel-shaped structure; 11. High-temperature steam inlet channel; 12. Steam discharge channel; 13. Thermometer; 14. Pressure gauge; 15. Gas heating flow structure; 151. Annular partition; 152. Annular sealing ring; 153. Longitudinal copper tube; 154. Horizontal copper tube; 155. Gas flow channel; 156. Gas one-way valve; 16. Elastic gas pressure Driving structure; 161, inner annular body; 162, outer annular body; 163, middle annular body; 164, annular elastic air film; 165, limiting telescopic rod; 166, bottom annular body; 167, horizontal connecting plate structure; 17, hydraulic telescopic structure; 171, longitudinal column; 172, liquid limiting flow cavity; 173, hydraulic oil inlet channel; 174, hydraulic oil discharge channel; 175, piston body; 176, telescopic rod; 177, coil spring; 178, fixed plate; 179, longitudinal movable cavity; 18, gas nozzle; 19, gas docking channel. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figure 1A pyrethrum extraction device comprises a longitudinal extraction tank 1 with a support leg 2 installed at the bottom of the circumference, an extraction cavity 3 arranged inside the longitudinal extraction tank 1, an annular heating cavity 4 arranged outside the circumference of the extraction cavity 3 and not connected to each other, a gas limiting cavity 5 arranged at the top of the extraction cavity 3, a raw material introduction channel 6 arranged at the top of the longitudinal extraction tank 1 and used for introducing extraction raw materials into the gas limiting cavity 5, a finished product discharge channel 8 arranged at the bottom of the longitudinal extraction tank 1 and used for finished product discharge, an upper valve body 7 and a lower valve body 9 respectively installed on the raw material introduction channel 6 and the finished product discharge channel 8 and used for controlling the flow of the medium, a high-temperature steam inlet channel 11 and a steam discharge channel 12 arranged on the side of the longitudinal extraction tank 1 and connected to the annular heating cavity 4, and a gas docking channel 19 arranged on the top of the longitudinal extraction tank 1 and used for an external air pump to inject gas into the extraction cavity 3. In order to enable the high-temperature steam to heat the flowing gas to the maximum extent, it is necessary to make the high-temperature steam inlet channel 11 and the steam discharge channel 12 symmetrically arranged at the positions where the two farthest points in the annular heating cavity 4 are located, and to install the high-temperature steam inlet channel 11 and the steam discharge channel 12. The thermometer 13 installed inside the longitudinal extraction tank 1 and used to monitor the temperature inside the extraction cavity 3 and the pressure gauge 14 installed inside the longitudinal extraction tank 1 and used to monitor the pressure inside the extraction cavity 3, first put the raw material into the extraction cavity 3, then put the extraction solvent in, and then the gas docking channel 19 needs to be connected with an air pump that can control the pressure value of the exhaust gas, and the air pump is used to inject air pressure into the extraction cavity 3, so as to change the pressure inside the extraction cavity 3, and the clear internal pressure can be obtained by observing the pressure gauge 14, and the high-temperature steam inlet channel 11 and the steam discharge channel 12 need to be docked with the pipeline hole of the steam engine that discharges high-temperature steam from the outside, and the steam engine has the function of controlling the temperature of the exhaust steam, and by discharging the high-temperature steam into the annular heating chamber 4, the pyrethrum raw material and the extraction solvent located inside the extraction cavity 3 can be heated, and the exact temperature value can be obtained by observing the thermometer 13, during the extraction process, the upper valve body 7 and the lower valve body 9 need to be in a closed state, and after the work is completed, the lower valve body 9 can be opened to realize the discharge of the raw material.

[0021] To allow the gas to be discharged at a certain pressure and thus prevent hydraulic tank backflow, please refer to Figure 1 , a funnel-shaped structure 10 is required to be arranged at the bottom end of the extraction cavity 3, and a plurality of gas nozzles 18 in an annular array are installed inside the funnel-shaped structure 10 for injecting gas from the annular heating cavity 4 into the extraction cavity 3. Due to the presence of the gas nozzle 18, it is possible to effectively prevent the hydraulic pressure from flowing back along the installation position to the inside of the annular heating cavity 4, and when the gas pressure reaches the discharge pressure of the gas nozzle 18, it will be discharged to the extraction cavity 3 through the gas nozzle 18, thereby realizing the directional discharge of the gas.

[0022] In order to realize the circulation of gas and the heating function during the flow process, please refer to Figure 1 , Figure 2 and Figure 3 , it is necessary to set up a gas heating flow structure 15, which is provided with an annular partition 151 that divides the annular heating chamber 4 into an upper half and a lower half, and a longitudinal copper tube 153 and a transverse copper tube 154 for gas to flow from the gas limiting chamber 5 to the bottom of the extraction chamber 3. In order to maximize the heating function of the high-temperature steam, it is necessary to make the horizontal height of the annular partition 151 lower than the horizontal height of the steam discharge channel 12 and higher than the horizontal height of the gas nozzle 18. When the high-pressure gas is injected into the upper area of ​​the extraction cavity 3, the gas can flow downward along the transverse copper tube 154 and the longitudinal copper tube 153 under the driving action, and the longitudinal copper tube 153 is inside the annular heating chamber 4. Therefore, the gas passing through the longitudinal copper tube 153 will be heated by the high-temperature steam, and the heated gas will be discharged to the bottom of the extraction liquid raw material through the gas nozzle 18. The high-temperature gas flows in the extraction liquid raw material from bottom to top in the form of bubbles under the action of buoyancy, and the flowing bubbles can transfer heat to the middle area of ​​the extraction liquid raw material, thereby accelerating the heating efficiency of the extraction liquid raw material.

[0023] For the specific structure of the gas heating flow structure 15, please refer to Figure 2 and Figure 3 , including an annular partition 151 clamped inside the annular heating chamber 4, the inner and outer annular surfaces of the annular partition 151 are embedded with an annular sealing ring 152 to prevent the gas from flowing along the installation gap, the annular plate body of the annular partition 151 is fixedly installed with a plurality of longitudinal copper tubes 153, and the top of each longitudinal copper tube 153 is installed with a transverse copper tube 154 that penetrates the longitudinal extraction tank 1 and extends to the inside of the gas limiting chamber 5 at one end, and the interior of the longitudinal copper tube 153 and the transverse copper tube 154 is provided with a gas flow channel 155 for the gas to flow from the gas limiting chamber 5 to the bottom of the extraction cavity 3, and the longitudinal copper tube 153 is installed with a gas one-way valve 156 at the bottom port of the gas flow channel 155. In order to prevent the backflow of gas during the air pressure extrusion process, it is necessary to make the air intake direction of the gas one-way valve 156 toward the transverse copper tube 154 and the exhaust port toward the space below the gas flow channel 155.

[0024] To achieve the gas suction and extrusion discharge function, please refer to Figure 1 and Figure 4, an elastic gas pressure driving structure 16 is required, in which an annular elastic gas film 164 is provided to divide the bottom area of ​​the annular heating chamber 4 into an upper half and a lower half, and a limiting telescopic rod 165 that penetrates the bottom structure of the longitudinal extraction tank 1 and can drive the annular elastic gas film 164 to deform. When the limiting telescopic rod 165 moves downward, the annular elastic gas film 164 will be deformed in a concave manner. At this time, the closed area between the annular elastic gas film 164 and the annular partition 151, hereinafter referred to as area a, increases in volume and reduces in pressure, and gas can pass through The longitudinal copper tube 153 is sucked into the a region to achieve gas suction, and when the limiting telescopic rod 165 moves upward, the annular elastic air film 164 will undergo a convex deformation. At this time, the volume of the a region is reduced and the internal air pressure is increased, which will cause the gas located in the a region to be discharged into the extraction liquid raw material through the gas nozzle 18. The flowing bubbles can also cause turbulence to the pyrethrum solid particles located inside the extraction liquid, thereby accelerating the flow ability of the pyrethrum solid particles in the extraction liquid, thereby further accelerating the extraction efficiency of the extraction solvent for pyrethrum.

[0025] For the specific structure of the elastic air pressure driving structure 16, please refer to Figure 4 , including an inner annular body 161 embedded in the inner ring of the annular heating chamber 4 and an outer annular body 162 embedded in the outer ring of the annular heating chamber 4, a middle annular body 163 is placed in the central area of ​​the inner annular body 161 and the outer annular body 162, an annular elastic air film 164 is correspondingly embedded between the outer annular surface of the inner annular body 161 and the inner annular surface of the middle annular body 163 and between the inner annular surface of the outer annular body 162 and the outer annular surface of the middle annular body 163. In order to have a clear working area, it is necessary to make the horizontal height of the annular elastic air film 164 lower than the horizontal height of the gas nozzle 18 and higher than the horizontal height of the bottom end of the annular heating chamber 4, A plurality of limiting telescopic rods 165 penetrating the bottom structure of the longitudinal extraction tank 1 are fixedly installed at the bottom end of the middle annular body 163, and the bottom ends of the limiting telescopic rods 165 are fixedly installed on the upper end surface of a bottom annular body 166. A transverse connecting plate structure 167 is provided on one side of the bottom annular body 166. Since the annular elastic air membrane 164 is an annular structure made of elastically deformable and high-temperature resistant material, when the gas is compressed, the gas can be squeezed and discharged in a buffered form, thereby preventing the degree of instantaneous change in the internal pressure of the extraction cavity 3 caused by rigid squeezing, so as to reduce the negative impact of small pressure on the extraction.

[0026] In order to realize the directional driving function of the annular elastic air membrane 164, please refer to Figure 1 , Figure 5 and Figure 6It is necessary to set a hydraulic telescopic structure 17 that can drive the transverse connecting plate structure 167 in the longitudinal direction. For the specific structure of the hydraulic telescopic structure 17, please refer to Figure 5 and Figure 6 , including a longitudinal column 171 fixedly installed at the lateral part of the supporting leg 2, a longitudinal active cavity 179 is arranged inside the longitudinal column 171, a liquid limiting flow cavity 172 is arranged at the top of the longitudinal active cavity 179, a hydraulic oil inlet channel 173 for injecting hydraulic oil into the liquid limiting flow cavity 172 and a hydraulic oil discharge channel 174 for discharging the liquid from the liquid limiting flow cavity 172 are arranged inside the longitudinal column 171, a piston body 175 movable in the longitudinal direction is arranged inside the longitudinal active cavity 179, in order to have a stable working process, it is necessary to make the movable range of the piston body 175 consistent with the movable range of the annular elastic air film 164 inside the annular heating cavity 4, and the bottom end of the piston body 175 is provided with a through longitudinal The telescopic rod 176 at the bottom end structure of the column 171 has a coil spring 177 installed on the periphery of the longitudinal active cavity 179 to drive the piston body 175 to reset. The bottom end of the telescopic rod 176 is installed with a fixed plate 178 fixed to the upper surface of the transverse connecting plate structure 167. During operation, the hydraulic oil inlet channel 173 and the hydraulic oil discharge channel 174 need to be connected to the discharge port and the inlet port of a hydraulic circulation pump respectively. After starting the hydraulic circulation pump, the liquid enters through the hydraulic oil inlet channel 173 and drives the piston body 175 downward, thereby driving the transverse connecting plate structure 167 to move downward. After the downward movement is completed, the coil spring 177 in a compressed state is released, so that the components and the liquid are reset.

[0027] When in use, the above-mentioned docking work is performed on the parts that need to be docked with external equipment, and then various external equipment, such as high-temperature steam engines, air pumps and hydraulic circulation pumps, are started. Before the above-mentioned equipment is driven, the raw materials need to be loaded into the extraction cavity 3 first, and then the extraction solvent is put in, and then the upper valve body 7 and the lower valve body 9 are closed. After the work is completed, the lower valve body 9 can be opened to realize the discharge of the raw materials.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pyrethrum extraction device, comprising a longitudinal extraction tank (1) having a support leg (2) installed at the bottom of the circumferential surface, an extraction cavity (3) arranged inside the longitudinal extraction tank (1), an annular heating cavity (4) arranged outside the circumferential surface of the extraction cavity (3) and not connected to each other, a gas limiting cavity (5) arranged at the top of the extraction cavity (3), a raw material delivery channel (6) arranged at the top of the longitudinal extraction tank (1) and used for delivering extraction raw materials into the gas limiting cavity (5), a finished product discharge channel (8) arranged at the bottom of the longitudinal extraction tank (1) and used for discharging finished products, and gas limiting cavity (5) arranged at the top of the extraction cavity (3) and used for delivering extraction raw materials into the gas limiting cavity (5), The invention comprises an upper valve body (7) and a lower valve body (9) which are provided on the side of the longitudinal extraction tank (1) and are used to control the flow of the medium, a high-temperature steam inlet channel (11) and a steam discharge channel (12) which are provided on the side of the longitudinal extraction tank (1) and are connected to the annular heating chamber (4), a gas connection channel (19) which is provided on the top of the longitudinal extraction tank (1) and is used for an external air pump to inject gas into the extraction cavity (3), a thermometer (13) which is installed inside the longitudinal extraction tank (1) and is used to monitor the internal temperature of the extraction cavity (3), and a pressure gauge (14) which is installed inside the longitudinal extraction tank (1) and is used to monitor the internal pressure of the extraction cavity (3), characterized in that: Also includes A funnel-shaped structure (10) is arranged at the bottom end of the extraction cavity (3), and a plurality of gas nozzles (18) in an annular array are installed inside the funnel-shaped structure (10) and are used to inject gas from the annular heating cavity (4) into the extraction cavity (3); A gas-heating flow structure (15), wherein an annular partition (151) is provided inside the annular heating chamber (4) for dividing the annular heating chamber (4) into an upper half and a lower half, and a longitudinal copper tube (153) and a transverse copper tube (154) for gas to flow from the gas limiting chamber (5) to the bottom of the extraction chamber (3); and an elastic gas pressure driving structure (16), inside which are arranged an annular elastic gas membrane (164) that divides the bottom area of ​​the annular heating chamber (4) into an upper half and a lower half, and a limiting telescopic rod (165) that penetrates the bottom structure of the longitudinal extraction tank (1) and can drive the annular elastic gas membrane (164) to deform.

2. The pyrethrum extraction device according to claim 1, characterized in that: The high-temperature steam inlet channel (11) and the steam exhaust channel (12) are symmetrically arranged at the locations of the two farthest points in the annular heating chamber (4).

3. The pyrethrum extraction device according to claim 1, characterized in that: The gas-heating flow structure (15) comprises an annular baffle (151) clamped inside the annular heating chamber (4); the inner and outer annular surfaces of the annular baffle (151) are both embedded with an annular sealing ring (152) for preventing gas from flowing along the installation gap; the annular plate body of the annular baffle (151) is fixedly mounted with a plurality of longitudinal copper tubes (153); the top of each longitudinal copper tube (153) is mounted with a transverse copper tube (154) that passes through the longitudinal extraction tank (1) and has one end extending to the inside of the gas limiting chamber (5); the interiors of the longitudinal copper tubes (153) and the transverse copper tubes (154) are provided with a gas flow channel (155) for gas to flow from the gas limiting chamber (5) to the bottom of the extraction chamber (3); the longitudinal copper tube (153) is mounted with a gas one-way valve (156) at the bottom port of the gas flow channel (155).

4. The pyrethrum extraction device according to claim 3, characterized in that: The level of the annular partition (151) is lower than the level of the steam exhaust channel (12) and higher than the level of the gas nozzle (18).

5. The pyrethrum extraction device according to claim 3, characterized in that: The gas one-way valve (156) has an air inlet direction toward the transverse copper tube (154), and an exhaust port toward the space below the gas flow channel (155).

6. The pyrethrum extraction device according to claim 1, characterized in that: The elastic air pressure driving structure (16) comprises an inner annular body (161) embedded in the inner ring of the annular heating chamber (4) and an outer annular body (162) embedded in the outer ring of the annular heating chamber (4); a middle annular body (163) is placed in the central area of ​​the inner annular body (161) and the outer annular body (162); an annular elastic air membrane (164) is correspondingly embedded between the outer annular surface of the inner annular body (161) and the inner annular surface of the middle annular body (163) and between the inner annular surface of the outer annular body (162) and the outer annular surface of the middle annular body (163); a plurality of limiting telescopic rods (165) penetrating the bottom structure of the longitudinal extraction tank (1) are fixedly mounted at the bottom end of the middle annular body (163); the bottom ends of the limiting telescopic rods (165) are fixedly mounted on the upper end surface of a bottom annular body (166); and a transverse connecting plate structure (167) is provided on one side of the bottom annular body (166).

7. The pyrethrum extraction device according to claim 6, characterized in that: The annular elastic air membrane (164) is an annular structure made of a material that can undergo elastic deformation and is resistant to high temperatures.

8. The pyrethrum extraction device according to claim 6, characterized in that: The level of the annular elastic air film (164) is lower than the level of the gas nozzle (18) and higher than the level of the bottom end of the annular heating chamber (4).

9. The pyrethrum extraction device according to claim 6, characterized in that: The invention also comprises a hydraulic telescopic structure (17) capable of driving the transverse connecting plate structure (167) in a longitudinal direction, the hydraulic telescopic structure (17) comprising a longitudinal column (171) fixedly mounted on a transverse portion of the supporting leg (2), the longitudinal column (171) being provided with a longitudinal active cavity (179) inside, the top of the longitudinal active cavity (179) being provided with a liquid position limiting flow cavity (172), the longitudinal column (171) being provided with a hydraulic oil inlet channel (173) for injecting hydraulic oil into the liquid position limiting flow cavity (172) and a hydraulic oil inlet channel (173) for injecting hydraulic oil into the liquid position limiting flow cavity (172) and a hydraulic oil inlet channel (173) for injecting hydraulic oil into the liquid position limiting flow cavity (172). A hydraulic oil discharge passage (174) is provided for discharging hydraulic oil from the longitudinal flow chamber (172) to the outside. A piston body (175) is placed inside the longitudinal movable chamber (179) and is movable in its longitudinal direction. A telescopic rod (176) penetrating the bottom structure of the longitudinal column (171) is installed at the bottom end of the piston body (175). A coil spring (177) for driving the piston body (175) to return to its original position is installed at the periphery of the longitudinal movable chamber (179). A fixing plate (178) fixed to the upper surface of the transverse connecting plate structure (167) is installed at the bottom end of the telescopic rod (176).

10. The pyrethrum extraction device according to claim 9, characterized in that: The movable range of the piston body (175) is consistent with the movable range of the annular elastic air membrane (164) inside the annular heating chamber (4).

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