A reduced pressure distillation device for the synthesis of a pesticide insecticide

Abstract

The present application relates to the technical field of pesticide production, and discloses a kind of pesticide insecticide synthesis reduced pressure distillation device, including the distillation cylinder, condenser, receiving cylinder, vacuum buffer tank and vacuum pump connected in sequence, and detection assembly for detecting distillation completion is arranged on the distillation cylinder, detection assembly includes the protective sleeve pipe installed on the distillation cylinder, bimetallic strip is arranged on the top wall of protective sleeve pipe, and inside is equipped with the lever assembly that is pushed by the bending deformation of bimetallic strip, and it further includes the vacuum release assembly arranged on the distillation cylinder, the air inlet is arranged on the top surface of distillation cylinder, and sealing seat is slidably arranged in the air inlet, when the force storage assembly moves downward, sealing seat is moved upward by linkage assembly. The present application can not only accurately judge the state of distillation completion, but also automatically perform vacuum relief operation after distillation completion, thereby improving the practicability of the device.

Description

Technical Field

[0001] This invention relates to the field of pesticide production technology, specifically to a vacuum distillation apparatus for synthesizing pesticides and insecticides. Background Technology

[0002] Phenoxycarb is an environmentally friendly insecticide that is highly effective, low in toxicity, and environmentally friendly. It is called an "environmentally friendly insecticide" because it is relatively safe for non-target organisms (such as mammals, birds, and bees) and does not easily leave persistent residues in the environment. It is usually used in liquid form.

[0003] In the production of phenoxycarb environmentally friendly insecticides, the reaction solvent often needs to be removed after the synthesis reaction. Vacuum distillation can efficiently accomplish this process. Vacuum distillation is a commonly used separation and purification technique in pesticide insecticide synthesis. Its principle is to lower the boiling point of the liquid by reducing the pressure within the system, thereby allowing distillation to take place at a lower temperature. It is particularly suitable for heat-sensitive compounds and is mainly used to extract and purify the active ingredients produced during the synthesis process and remove impurities, thus improving the purity of the pesticide insecticide.

[0004] In existing vacuum distillation equipment, the removal of reaction solvents after synthesis is usually judged by worker experience or by the distillation time. However, the above methods have certain limitations in judging whether the distillation is complete, which affects the accuracy of the judgment and thus reduces the quality requirements of the product. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned difficulties and provide a vacuum distillation apparatus for the synthesis of pesticides and insecticides.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vacuum distillation device for synthesizing pesticides and insecticides, comprising a distillation cylinder, a condenser, a receiving cylinder, a vacuum buffer tank, and a vacuum pump connected in sequence. The distillation cylinder is provided with a detection component for detecting the completion of distillation. The detection component includes a protective sleeve installed on the distillation cylinder and in contact with the liquid inside. A bimetallic strip is provided on the top wall of the protective sleeve, and a lever assembly is provided inside the sleeve, which is pushed by the bending deformation of the bimetallic strip. The protective sleeve also contains a power storage component and a positioning component for fixing the power storage component. When the lever assembly moves, it triggers the positioning component to release the fixing of the power storage component, and then the power storage component moves downward.

[0007] It also includes a vacuum release assembly mounted on the distillation cylinder. The vacuum release assembly includes an air inlet mounted on the top surface of the distillation cylinder, a sealing seat slidably disposed within the air inlet, and a linkage assembly between the sealing seat and the accumulator assembly. When the accumulator assembly moves downward, the linkage assembly drives the sealing seat to move upward, thus opening the air inlet.

[0008] As an improvement, the power storage component includes a bearing seat threadedly connected inside the protective sleeve, and a lifting rod with a rebound function is slidably provided inside the bearing seat, with a mounting seat provided on the top surface of the lifting rod;

[0009] The positioning component includes a support plate fixedly installed inside the protective sleeve, a positioning pin with a spring-back function slidably provided on the support plate, and a pin hole for the positioning pin to extend into on the mounting base.

[0010] The lever assembly swings up and down, causing the positioning pin to slide left and right and separate from or engage with the pin hole. The downward sliding of the lifting rod causes the sealing seat to move upward through the linkage assembly.

[0011] As an improvement, the lever assembly includes a swing seat hinged to the protective sleeve via a pivot. The top surface of the swing seat is provided with an abutment rod that contacts the deformed end of the bimetallic strip. An extension seat extends from the bottom surface of the swing seat away from the abutment rod. A cam is provided on the extension seat. A U-shaped frame is fixed on a positioning pin, and a roller adapted to the cam is rotatably mounted on the U-shaped frame.

[0012] A torsion spring is wound around the rotating shaft, and a fixing component is installed inside the protective sleeve to position the swing seat when it swings downward to its limit position. When the lifting rod slides up and down, it drives the fixing component to perform the release or positioning operation.

[0013] As an improvement, the fixing component includes an arc-shaped plate disposed on the bottom surface of the swing seat, the arc-shaped plate having a positioning groove, a connecting cylinder fixed on the inner wall of the protective sleeve, a sliding rod with automatic telescopic function disposed inside the connecting cylinder, a limiting plate extending into the positioning groove disposed on the sliding rod, a frame disposed inside the limiting plate and a wedge block disposed within the frame, and a mating block adapted to the wedge block disposed on the lifting rod.

[0014] As an improvement, a guide rod that slides with the sealing seat is fixedly provided on the air inlet. The linkage assembly includes support frames respectively set on the top and bottom surfaces of the distillation cylinder. Pulleys are rotatably provided on the two support frames respectively. A guide wheel is also rotatably provided on the bottom surface of the distillation cylinder. A pull rope that passes through the two pulleys and the guide wheel in sequence is fixed between the sealing seat and the lifting rod.

[0015] As an improvement, a limiting seat is provided on the top surface of the guide rod, and a spring is fixedly provided between the limiting seat and the sealing seat.

[0016] As an improvement, a control component for stopping the heating element and vacuum pump on the distillation cylinder is also included. The control component includes a self-locking push-button switch on the distillation cylinder and an adapter block on the lifting rod to actuate the push-button switch.

[0017] The advantages of this invention compared to the prior art are as follows:

[0018] 1. With the cooperation of the protective sleeve, bimetallic strip, lever assembly, accumulator assembly, linkage assembly, and vacuum release assembly, when the reaction solvent in the synthesis liquid is distilled, since the reaction solvent has been removed, the temperature of the liquid inside the distillation cylinder will rise when it continues to be heated. The increased temperature will be conducted to the bimetallic strip through the top wall of the protective sleeve, causing the bimetallic strip to bend and deform. When the bimetallic strip bends and deforms, it will push the lever assembly to move and release the positioning of the accumulator assembly. When the accumulator assembly moves downward, it will drive the vacuum release assembly through the linkage assembly. At this time, external air will enter the distillation cylinder to break the vacuum. This allows the concentrate in the distillation cylinder to be fed under normal pressure, thereby enabling accurate judgment of the distillation completion status and improving the quality requirements of the product.

[0019] 2. Under the action of the lifting rod with the rebound function, the potential energy of the lifting rod can be stored by compressing the spring during the positioning process. After the positioning of the lifting rod is released, the spring quickly extends and releases the potential energy stored in the lifting rod, thereby increasing the action force of the linkage component.

[0020] 3. With the cooperation of the rotating shaft, swing seat, abutment rod, extension seat, cam and roller, when the bimetallic strip is bent and deformed, one end of the swing seat can swing downward and the other end can swing upward and separate the cam and roller, thereby releasing the positioning of the lifting rod. The swing adjustment of the swing seat can amplify the force that releases the positioning of the lifting rod through the lever principle.

[0021] 4. Under the action of the linkage component, when the lifting rod slides down, the vacuum release component can be automatically adjusted to keep the air inlet open, thereby improving the ease of operation of this device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the distillation cylinder in this invention.

[0024] Figure 3 This is a schematic diagram of the internal structure of the distillation cylinder in this invention.

[0025] Figure 4This is the present invention. Figure 3 Enlarged view of point A in the middle.

[0026] Figure 5 This is a schematic diagram of the lever assembly in this invention. Figure 1 .

[0027] Figure 6 This is a schematic diagram of the lever assembly in this invention. Figure 2 .

[0028] Figure 7 This is a schematic diagram of the positioning component in this invention.

[0029] Figure 8 This is a schematic diagram of the structure of the fixing component in this invention.

[0030] Figure 9 This is a schematic diagram of the linkage component in this invention.

[0031] As shown in the figure: 1. Distillation cylinder; 111. Liquid inlet pipe; 112. Steam pipe; 113. Discharge pipe; 2. Detection assembly; 211. Protective sleeve; 212. Bimetallic strip; 3. Lever assembly; 311. Rotating shaft; 312. Swing seat; 313. Abutment rod; 314. Extension seat; 315. Cam; 316. Roller; 317. Torsion spring; 4. Energy storage assembly; 411. Bearing seat; 412. Lifting rod; 413. Mounting seat; 414. Cavity; 415. Pressure plate; 416. Energy storage spring; 5. Positioning assembly; 511. Support plate; 512. Positioning pin; 514. Limit seat; 513. Reset. 6. Spring; 7. Vacuum release assembly; 8. Air inlet; 9. Sealing seat; 10. Guide rod; 11. Blocking seat; 12. Spring; 13. Linkage assembly; 14. Support frame; 15. Pulley; 16. Guide wheel; 17. Pull rope; 18. Fixing assembly; 19. Arc plate; 10. Positioning groove; 10. Connecting cylinder; 11. Slide rod; 12. Limiting plate; 13. Frame; 14. Wedge block; 15. Mating block; 16. Control assembly; 17. Push button switch; 18. Adapter block; 19. Condenser; 10. Receiving cylinder; 11. Vacuum buffer tank; 12. Vacuum pump. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 4As shown, a vacuum distillation apparatus for synthesizing pesticides and insecticides includes a distillation cylinder 1, a condenser 10, a receiving cylinder 11, a vacuum buffer tank 12, and a vacuum pump 13 connected in sequence. The distillation cylinder 1 is provided with a liquid inlet pipe 111 that communicates with it, and an electric heating jacket is provided on its outer wall to heat the liquid inside. A discharge pipe 113 is also provided on its bottom surface. The top surface of the distillation cylinder 1 is connected to the gas outlet of the condenser 10 through a steam pipe 112. The liquid outlet of the condenser 10 is connected to the liquid inlet of the receiving cylinder 11, the receiving cylinder 11 is connected to the vacuum buffer tank 12, and the vacuum buffer tank 12 is connected to the vacuum pump 13 through pipelines. Through the above connections, the distillation cylinder 1 is kept in a vacuum state when the vacuum pump 13 is started during the entire distillation process. The above is the prior art.

[0034] The distillation cylinder 1 is equipped with a detection component 2 for detecting the completion of distillation. The detection component 2 includes a protective sleeve 211 installed on the distillation cylinder 1 and in contact with the liquid inside. The protective sleeve 211 is installed on the bottom wall of the distillation cylinder 1 by a threaded connection. To achieve a seal after connection, a sealing gasket is provided at the contact point between the two. The top wall of the protective sleeve 211 is made of a thermally conductive material. Since the pesticide brake agent has high corrosiveness after synthesis, in order to meet the requirements of the detection component 2 for use in highly corrosive environments, a bimetallic strip 212 is provided on the top wall of the protective sleeve 211 (the bimetallic strip is made of two materials with different coefficients of thermal expansion). It is made of metal sheets. When the temperature rises to a certain level, it bends towards the side with the lower coefficient of expansion; when the temperature drops, it bends in the opposite direction until it returns to its original shape after cooling (this is existing technology). Inside, there is a lever assembly 3 that is pushed by the bending deformation of the bimetallic sheet 212. The bimetallic sheet 212 has a butterfly structure, and the protective sleeve 211 contains a force storage assembly 4 and a positioning assembly 5 that fixes the force storage assembly 4. When the lever assembly 3 moves, it triggers the positioning assembly 5 to release the fixation of the force storage assembly 4, and then the force storage assembly 4 moves downward. The setting of the lever assembly 3 can amplify the thrust when the positioning assembly 5 moves.

[0035] It also includes a vacuum release assembly 6 installed on the distillation cylinder 1. The vacuum release assembly 6 includes an air inlet 611 installed on the top surface of the distillation cylinder 1. A sealing seat 612 is slidably installed inside the air inlet 611. A linkage assembly 7 is installed between the sealing seat 612 and the power storage assembly 4. When the power storage assembly 4 moves downward, the linkage assembly 7 drives the sealing seat 612 to move upward and opens the air inlet 611. The power storage assembly 4 can increase the force applied to the linkage assembly 7.

[0036] It also includes a control component 9 for stopping the heating element and vacuum pump 13 on the distillation cylinder 1. The control component 9 includes a self-locking push button switch 911 installed on the distillation cylinder 1. The power storage component 4 is provided with an adapter block 912 that pushes the push button switch 911 to operate. The heating element and vacuum pump 13 on the distillation cylinder 1 can be stopped by the cooperation of the push button switch 911, the time relay and the contactor. The electrical connection of the push button switch 911, the time relay and the contactor is the prior art.

[0037] With the above structure, the synthetic liquid is first injected into the distillation cylinder 1 through the inlet pipe 111. Then, the electric heating jacket and vacuum pump 13 are started to distill the reaction solvent in the synthetic liquid. During this process, the electric heating jacket conducts heat to the distillation cylinder 1 to heat the liquid, and the vacuum pump 13 maintains a vacuum state inside the distillation cylinder 1. After the reaction solvent in the synthetic liquid in the distillation cylinder 1 has been distilled, since the reaction solvent has been removed, when the distillation cylinder 1 continues to be heated, the temperature of the liquid inside will rise. The increased temperature will be conducted through the top wall of the protective sleeve 211 to the bimetallic strip 212, causing the bimetallic strip 212 to bend. The bending deformation then pushes the lever assembly 3 to move and releases the positioning of the accumulator assembly 4. When the accumulator assembly 4 moves downward, the adapter block 912 first pushes the button switch 911 to move, controlling the heating element and vacuum pump 13 to stop in sequence. Then, the linkage assembly 7 drives the vacuum release assembly 6 to move, moving the sealing seat 612 upward and separating it from the air inlet 611. At this time, external air will enter the distillation cylinder 1 from the air inlet 611 to break the vacuum. This allows the concentrate in the distillation cylinder 1 to be fed under normal pressure, thereby enabling accurate judgment of the distillation completion status and improving the quality requirements of the product.

[0038] Combined with appendix Figure 3 Appendix Figure 4 and attached Figure 7 As shown, the energy storage component 4 includes a support seat 411 threadedly connected to the protective sleeve 211. The threaded connection between the support seat 411 and the protective sleeve 211 makes them detachable, which facilitates the installation of components inside the protective sleeve 211. A lifting rod 412 with a rebound function is slidably inserted inside the support seat 411. A mounting seat 413 is provided on the top surface of the lifting rod 412. A cavity 414 is opened inside the support seat 411 for the lifting rod 412 to pass through. A pressure plate 415 is provided on the lifting rod 412. An energy storage spring 416 is sleeved on the lifting rod 412 between the pressure plate 415 and the cavity 414.

[0039] The positioning component 5 includes a support plate 511 fixedly installed inside the protective sleeve 211. A positioning pin 512 with a spring-loaded function is slidably provided on the support plate 511. A reset spring 513 is sleeved on the positioning pin 512. A limiting seat 514 is also provided. A pin hole is opened on the mounting seat 413 for the positioning pin 512 to extend into. The mounting seat 413 is positioned by the cooperation between the positioning pin 512 and the pin hole, and the lifting rod 412 is positioned at the same time.

[0040] The up-and-down swing of the lever assembly 3 causes the positioning pin 512 to slide left and right and separate or engage with the pin hole. The downward sliding of the lifting rod 412 drives the sealing seat 612 to move upward through the linkage assembly 7.

[0041] The working principle of the upward movement of the sealing seat 612 is as follows: When the lifting rod 412 is in the positioning state, the storage spring 416 and the return spring 513 are in a compressed state. The bimetallic strip 212 is deformed by heat, which drives the lever assembly 3 to swing downward, and then drives the positioning pin 512 to slide to the left and separate from the pin hole, releasing the positioning of the lifting rod 412. At this time, the storage spring 416 will quickly extend, and then drive the lifting rod 412 to slide downward forcefully. Then, through the linkage assembly 7, the sealing seat 612 will slide upward and separate from the air inlet 611, opening the air inlet 611. External air enters the distillation cylinder 1 through the air inlet 611, releasing the vacuum state inside the distillation cylinder 1. The vacuum breaking operation can restore the balance between the internal air pressure and the external atmospheric pressure of the distillation cylinder 1, thereby avoiding the violent influx of external airflow or material splashing due to pressure difference when the discharge port is opened in a vacuum state.

[0042] Combined with appendix Figure 4 Appendix Figure 5 and attached Figure 6 As shown, the lever assembly 3 includes a swing seat 312 hinged to the protective sleeve 211 via a pivot 311. The top surface of the swing seat 312 is provided with an abutment rod 313 that contacts the deformed end of the bimetallic strip 212. The pivot 311 is installed at a position away from the abutment rod 313. An extension seat 314 is also provided on the bottom surface of the swing seat 312 away from the abutment rod 313. A cam 315 is provided on the extension seat 314. A U-shaped frame is fixed on the positioning pin 512, and a roller 316 adapted to the cam 315 is rotatably provided on the U-shaped frame.

[0043] A torsion spring 317 is wound around the rotating shaft 311, and a fixing component 8 is provided inside the protective sleeve 211 to position the swing seat 312 when it swings downward to the limit position. When the swing seat 312 swings downward, the torsion spring 317 twists, and when the lifting rod 412 slides up and down, it drives the fixing component 8 to perform the release or positioning operation.

[0044] The working principle of the lifting rod 412 sliding downward is as follows: In the initial state, the bimetallic strip 212 is in an undeformed state, and the lifting rod 412 is in a positioning state. When the bimetallic strip 212 is heated and bent downward, it will push the abutment rod 313 to move downward, and then drive the swing seat 312 to slide downward. At the same time, it will drive the cam 315 to swing downward and separate from the roller 316. At this time, the roller 316 and the positioning pin 512 will slide to the left and separate from the pin hole under the reaction force of the return spring 513, and the positioning of the lifting rod 412 will be released. Then, the lifting rod 412 will slide downward quickly and powerfully under the action of the storage spring 416. During the downward sliding process of the lifting rod 412, not only will the linkage component 7 be driven to move, but the fixing component 8 will also be driven to move. The action of the fixing component 8 will position the swing seat 312 after it swings downward.

[0045] Combined with appendix Figure 4 Appendix Figure 5 and attached Figure 8 As shown, the fixing component 8 includes an arc-shaped plate 811 disposed on the bottom surface of the swing seat 312. A positioning groove 812 is provided in the arc-shaped plate 811. A connecting cylinder 813 is fixedly disposed on the inner wall of the protective sleeve 211. A sliding rod 814 with automatic telescopic function is provided in the connecting cylinder 813. A compression spring is fixed between the sliding rod 814 and the bottom wall of the connecting cylinder 813. A limiting plate 815 extending into the positioning groove 812 is provided on the sliding rod 814. A frame 816 is provided in the limiting plate 815, and a wedge block 817 is provided in the frame 816. A mating block 818 adapted to the wedge block 817 is provided on the lifting rod 412.

[0046] The working principle of the fixed component 8 is as follows: When the lifting rod 412 is in the positioning state, under the action of the mating block 818 and the wedge block 817, the slide rod 814 retracts into the connecting cylinder 813. At this time, the compression spring is in a compressed state. When the lifting rod 412 slides down, it drives the mating block 818 to slide down and separate from the wedge block 817. At this time, under the reaction force of the compression spring, it will drive the slide rod 814 to slide to the left and cause the limiting plate 815 to extend into the positioning groove 812, which performs the positioning operation of the swing seat 312 after swinging down, thus avoiding the upward swing operation of the swing seat 312 after the bimetallic strip 212 cools and resets.

[0047] Combined with appendix Figure 3 and attached Figure 9As shown, the air inlet 611 is fixedly provided with a guide rod 613 that slides with the sealing seat 612. There are three guide rods 613, which are evenly distributed along the circumference of the air inlet 611. The linkage assembly 7 includes a support frame 711 respectively set on the top and bottom surfaces of the distillation cylinder 1. The two support frames 711 are respectively provided with pulleys 712. A guide wheel 713 is also provided on the bottom surface of the distillation cylinder 1. A pull rope 714 is fixed between the sealing seat 612 and the lifting rod 412, which passes through the two pulleys 712 and the guide wheel 713 in sequence. Each guide rod 613 is provided with a blocking seat 614 on its top surface. A spring 615 is fixed between the blocking seat 614 and the sealing seat 612. The sealing seat 612 has a conical structure. A conical surface adapted to the conical structure is opened on the inner wall of the air inlet 611. When the sealing seat 612 slides down to seal the air inlet 611, the spring 615 is in a stretched state.

[0048] The working principle of the linkage component 7 is as follows: When the lifting rod 412 slides downward, it drives one end of the pull rope 714 connected to it to slide downward. Under the action of the guide wheel 713 and the two pulleys 712, it drives the other end of the pull rope 714 to slide upward, which in turn drives the sealing seat 612 to slide upward on the guide rod 613 and separate it from the air inlet 611, so that the air inlet 611 is in the open state. When the next distillation operation is performed, the operator presses the sealing seat 612 downward by hand to seal the air inlet 611. At this time, with the cooperation of the pull rope 714, the two pulleys 712 and the guide wheel 713, it will... The lifting rod 412 slides upward, while the mating block 818 slides downward to engage with the wedge block 817. Under the combined action of the two, the limiting plate 815 slides to the right and separates from the positioning groove 812, releasing the positioning of the swing seat 312. At this time, the reaction force of the torsion spring 317 causes the swing seat 312 to swing upward, while the cam 315 swings upward and engages with the roller 316, pushing the positioning pin 512 to slide to the right. The lifting rod 412 is positioned by the engagement of the positioning pin 512 and the pin hole, and the sealing seat 612 is positioned after moving downward.

[0049] In specific implementation of this invention, the synthetic liquid is first injected into the distillation cylinder 1 through the liquid inlet pipe 111 for distillation. After the reaction solvent of the synthetic liquid in the distillation cylinder 1 is distilled, the temperature of the liquid inside will rise. The increased temperature will be conducted to the bimetallic strip 212 through the top wall of the protective sleeve 211, causing the bimetallic strip 212 to bend and deform. Then, the lever assembly 3 is pushed to move and the positioning of the accumulator assembly 4 is released. When the accumulator assembly 4 moves downward, the linkage assembly 7 drives the sealing seat 612 to move upward and separate from the air inlet 611. At this time, the external air will enter the distillation cylinder 1 from the air inlet 611 to break the vacuum. This allows the concentrate in the distillation cylinder 1 to be fed under normal pressure, thereby enabling accurate judgment of the distillation completion status and improving the quality requirements of the product.

[0050] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A vacuum distillation apparatus for synthesizing pesticides and insecticides, comprising a distillation cylinder (1), a condenser (10), a receiving cylinder (11), a vacuum buffer tank (12), and a vacuum pump (13) connected in sequence, characterized in that: The distillation cylinder (1) is provided with a detection component (2) for detecting the completion of distillation. The detection component (2) includes a protective sleeve (211) installed on the distillation cylinder (1) and in contact with the liquid inside. The top wall of the protective sleeve (211) is provided with a bimetallic strip (212). Inside the sleeve is a lever component (3) that is pushed by the bending deformation of the bimetallic strip (212). The protective sleeve (211) is provided with a power storage component (4) and a positioning component (5) for fixing the power storage component (4). When the lever component (3) moves, the positioning component (5) is triggered to release the fixing of the power storage component (4), and then the power storage component (4) moves downward. It also includes a vacuum release assembly (6) installed on the distillation cylinder (1). The vacuum release assembly (6) includes an air inlet (611) installed on the top surface of the distillation cylinder (1). A sealing seat (612) is slidably provided inside the air inlet (611). A linkage assembly (7) is provided between the sealing seat (612) and the power storage assembly (4). When the power storage assembly (4) moves downward, the linkage assembly (7) drives the sealing seat (612) to move upward and puts the air inlet (611) in an open state. The power storage component (4) includes a support seat (411) threadedly connected to the protective sleeve (211), and a lifting rod (412) with a rebound function is slidably provided in the support seat (411). A mounting seat (413) is provided on the top surface of the lifting rod (412). The positioning component (5) includes a support plate (511) fixedly installed inside the protective sleeve (211), a positioning pin (512) with a spring-back function is slidably provided on the support plate (511), and a pin hole for the positioning pin (512) to be inserted is provided on the mounting base (413). The up-and-down swing of the lever assembly (3) causes the positioning pin (512) to slide left and right and to separate or engage with the pin hole. The downward sliding of the lifting rod (412) causes the sealing seat (612) to move upward through the linkage assembly (7). The lever assembly (3) includes a swing seat (312) hinged to the protective sleeve (211) via a pivot (311). The top surface of the swing seat (312) is provided with an abutment rod (313) that contacts the deformed end of the bimetallic strip (212). An extension seat (314) is provided on the bottom surface of the swing seat (312) away from the abutment rod (313). A cam (315) is provided on the extension seat (314). A U-shaped frame is fixed on the positioning pin (512), and a roller (316) adapted to the cam (315) is rotatably provided on the U-shaped frame. A torsion spring (317) is wound around the rotating shaft (311), and a fixing component (8) is provided inside the protective sleeve (211) to position the swing seat (312) when it swings down to the limit position. When the lifting rod (412) slides up and down, it drives the fixing component (8) to perform the release or positioning operation.

2. The vacuum distillation apparatus for synthesizing pesticides and insecticides according to claim 1, characterized in that: The fixing component (8) includes an arc plate (811) disposed on the bottom surface of the swing seat (312), a positioning groove (812) is provided in the arc plate (811), a connecting cylinder (813) is fixedly disposed on the inner wall of the protective sleeve (211), a sliding rod (814) with automatic telescopic function is provided in the connecting cylinder (813), a limiting plate (815) extending into the positioning groove (812) is provided on the sliding rod (814), a frame (816) is provided in the limiting plate (815), and a wedge block (817) is provided in the frame (816), and a mating block (818) adapted to the wedge block (817) is provided on the lifting rod (412).

3. The vacuum distillation apparatus for synthesizing pesticides and insecticides according to claim 1, characterized in that: The air inlet (611) is fixedly provided with a guide rod (613) that slides with the sealing seat (612). The linkage assembly (7) includes a support frame (711) respectively set on the top and bottom surfaces of the distillation cylinder (1). The two support frames (711) are respectively provided with pulleys (712). A guide wheel (713) is also provided on the bottom surface of the distillation cylinder (1). A pull rope (714) is fixedly provided between the sealing seat (612) and the lifting rod (412) and passes through the two pulleys (712) and the guide wheel (713) in sequence.

4. The vacuum distillation apparatus for synthesizing pesticides and insecticides according to claim 3, characterized in that: The guide rod (613) has a stop seat (614) on its top surface, and a spring (615) is fixed between the stop seat (614) and the sealing seat (612).

5. The vacuum distillation apparatus for synthesizing pesticides and insecticides according to claim 1, characterized in that: It also includes a control assembly (9) for stopping the heating element and vacuum pump (13) on the distillation cylinder (1). The control assembly (9) includes a self-locking push button switch (911) provided on the distillation cylinder (1) and an adapter block (912) on the lifting rod (412) for actuating the push button switch (911).

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