A petrochemical aromatics and saturated hydrocarbon separation device

Abstract

The invention discloses a petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device, which relates to the technical field of petrochemical industry. The device comprises an assembly pipe, wherein a driving component for driving oil to enter is provided at one end of the assembly pipe, and a control component for controlling the oil inlet rate is built in at the other end of the assembly pipe. A push rod drives a plug seat at the other end to move in the assembly pipe. When the plug seat is away from the oil inlet pipe, it attracts moving balls in multiple exhaust pipes. The moving seat cannot move due to the limitation of the filter plate, so that all the force acts on the sealing seats of the multiple limiting rollers, the pipe mouth of the oil inlet pipe is opened, and the oil enters the distillation tower for separation of aromatic hydrocarbons and saturated hydrocarbons. When the plug seat is driven by the driving component to approach the oil inlet pipe, the oil cannot be attracted to enter. The gas in the pipe can be discharged from the multiple exhaust holes by squeezing the moving balls, thereby realizing intermittent oil supply, giving the oil that has reached the distillation tower sufficient time for distillation and separation, and improving the subsequent chemical distillation and separation quality.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical industry, in particular to a petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device. Background Art

[0002] The petrochemical aromatics and saturated hydrocarbon separation device is a device used to separate aromatics and saturated hydrocarbons in crude oil or petrochemical products. In the petrochemical process, crude oil will produce different types of hydrocarbon compounds after the refining process, including aromatics and saturated hydrocarbons. Aromatic hydrocarbons are a class of compounds composed of benzene rings (a ring structure composed of six carbon atoms) and their derivatives, which have high molecular structure stability and combustion calorific value. Saturated hydrocarbons are hydrocarbon compounds composed of carbon-hydrogen bonds, such as alkanes, cycloalkanes, etc., whose molecular structure is relatively simple. The main function of the petrochemical aromatics and saturated hydrocarbon separation device is to effectively separate aromatics and saturated hydrocarbons in the mixture based on the differences in their physical properties. These devices usually use physical separation methods such as distillation, extraction, adsorption, etc., and use different boiling points, solubility, hydrophilicity and other characteristics to achieve separation;

[0003] Under the existing technology, aromatic hydrocarbons and saturated hydrocarbons are separated by distillation towers by utilizing the difference in boiling points at different temperatures. Vacuum distillation is suitable for the separation of high-boiling-point components. The original fraction is further distilled through multi-stage distillation towers to obtain purer aromatic hydrocarbon and saturated hydrocarbon products. However, in actual use, due to the problem of time rate and effect of petroleum distillation, and the petroleum feed is often carried out continuously, it is easy to cause the petroleum that has not been distilled and separated to be impacted by the later one, thereby reducing the distillation efficiency and increasing the distillation cost. It is necessary to improve the existing technology. To this end, we propose a petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] The present invention provides a petrochemical aromatic and saturated hydrocarbon separation device, comprising an assembly pipe, one end of which is provided with a drive component for driving oil to enter, the other end of which is built-in with a control component for controlling the oil inlet rate, the bottom of the assembly pipe is fixedly connected to a connecting pipe, the output end of the connecting pipe is fixedly connected to a distillation tower, the drive component comprises a fixed shell, the bottom of the inner cavity of the fixed shell is sleeved with a motor, the output end of the motor is fixedly connected to a drive roller, the surface of the drive roller is sleeved with an assembly disk, the inner ring wall at the top of the assembly disk is fixedly connected to a plurality of teeth, the top of the drive roller is fixedly connected to a drive gear, a connecting gear is provided between the drive gear and the assembly disk, and the two sides of the connecting gear are respectively meshed with the drive gear and the assembly disk.

[0007] Preferably, the motor is fixedly connected to the fixed shell, the plurality of teeth are evenly distributed around the axis of the assembly disk, the driving gear is placed on the top of the assembly disk and is slidingly connected to the assembly disk, the driving gear coincides with the axis of the assembly disk, the assembly disk is rotationally connected to the driving roller, the outer ring wall of the assembly disk is fixedly connected to the inner wall of the fixed shell, the top of the connecting gear is fixedly connected to a rotating rod, and a push rod is sleeved on the surface of the rotating rod.

[0008] Preferably, one end of the push rod is rotatably connected to the rotating rod, and the end of the push rod away from the rotating rod is fixedly connected to a ball seat, a plug seat is sleeved on the surface of the ball seat, and a circular groove matching it is opened at the end of the plug seat close to the ball seat, the ball seat is placed in the circular groove and slidably connected to it, and the plug seat is made of rubber.

[0009] Preferably, the plug seat is placed in the assembly tube, the plug seat is slidably connected to the inner wall of the assembly tube on all sides, the inner wall of the assembly tube is fixedly connected to a limit ring, a hole connected to the oil inlet pipe is opened at the bottom of the assembly tube, and the inlet end of the connecting pipe is arranged between the limit ring and the plug seat.

[0010] Preferably, the control assembly includes an oil inlet pipe, one end of which is fixedly connected to the assembly pipe, the axes of the oil inlet pipe and the assembly pipe coincide, and a rubber ring is fixedly connected to the inner wall of one end of the oil inlet pipe close to the assembly pipe.

[0011] Preferably, a plurality of limiting rollers are fixedly connected to the side of the rubber ring close to the plug seat, and the plurality of limiting rollers are distributed around the axis of the rubber ring. The end of the limiting roller away from the rubber ring is fixedly connected to the limiting ring, and a sealing seat is provided between the plurality of limiting rollers.

[0012] Preferably, a plurality of sliding grooves matching the limiting rollers are provided around the sealing seat, the limiting rollers are slidably connected to the sliding groove walls, the sealing seat is in contact with the rubber ring on the side close to the oil inlet pipe, the limiting roller is fixedly connected to the limiting ring on one end close to the assembly tube, and a plurality of exhaust pipes are fixedly connected around the assembly tube.

[0013] Preferably, the plurality of exhaust pipes are evenly distributed around the axis of the assembly pipe, one end of the exhaust pipe passes through the assembly pipe and extends to the outside, the exhaust pipe has a plurality of exhaust holes at one end outside the assembly pipe, the plurality of exhaust holes are evenly distributed around the axis of the exhaust pipe, and a connecting tube is fixedly connected to the bottom of the inner cavity of the exhaust pipe.

[0014] Preferably, a telescopic spring is fixedly connected to the bottom of the inner cavity of the connecting tube, and a motion ball is built into the exhaust pipe. The motion ball is slidably connected to the inner wall of the exhaust pipe. A connecting groove is provided on the side of the motion ball close to the connecting tube, and the end of the telescopic spring away from the connecting tube is in contact with the bottom of the connecting groove. Connecting ring grooves are provided around the motion ball.

[0015] Preferably, a rubber pad is built into the connecting ring groove, the outer ring wall of the rubber pad is slidably connected to the inner wall of the exhaust pipe, a filter plate is provided at the air inlet end of the exhaust pipe, the filter plate is fixedly connected to the inner wall of the exhaust pipe on all sides, and a plurality of connecting holes are opened on the surface of the filter plate.

[0016] Compared with the existing technology, one or more of the above technical solutions have the following beneficial effects:

[0017] The present invention is provided with a connecting gear that rotates around the axis of a driving roller. The pushing rod on the top of the connecting gear will continuously move back and forth with the movement of the connecting gear. The pushing rod will drive the plug seat at the other end to move in the assembly pipe. When the plug seat is away from the oil inlet pipe, it attracts the moving balls in the multiple exhaust pipes. The moving seat cannot move due to the limitation of the filter plate, so that all the force acts on the sealing seats of the multiple limiting rollers. When the sealing seat approaches the limiting ring, the pipe mouth of the oil inlet pipe is opened, and the oil enters and enters the distillation tower from the assembly pipe and the connecting pipe for separation of aromatic hydrocarbons and saturated hydrocarbons. When the plug seat is driven by the driving component to approach the oil inlet pipe, it cannot attract the oil to enter. The gas in the pipe can be discharged from the multiple exhaust holes by squeezing the moving balls. The design of the limiting roller and the sealing seat enables the pipe mouth of the oil inlet pipe to be opened or closed, thereby realizing the control of the oil flow rate, reciprocating back and forth, and realizing intermittent oil supply. The speed and flow of the oil entering can be better controlled, giving the oil that has reached the distillation tower time for sufficient distillation and separation, thereby improving the subsequent chemical distillation and separation quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2It is a schematic diagram of the assembly structure of the sports ball and the exhaust pipe of the present invention.

[0021] Figure 3 It is a schematic diagram of the internal structure of the assembly tube of the present invention.

[0022] Figure 4 It is a schematic diagram of the assembly structure of the limit ring and the sealing seat of the present invention.

[0023] Figure 5 It is a schematic diagram of the assembly structure of the drive assembly and the assembly pipe of the present invention.

[0024] Figure 6 It is a schematic diagram of the drive assembly structure of the present invention.

[0025] Figure 7 It is a schematic diagram of the internal structure of the control component of the present invention.

[0026] In the picture:

[0027] 1. Assembly pipe; 101. Connecting pipe; 102. Distillation tower; 2. Drive assembly; 201. Motor; 202. Drive roller; 203. Assembly disk; 204. Drive gear; 205. Teeth; 206. Connecting gear; 207. Rotating rod; 208. Push rod; 209. Ball seat; 210. Plug seat; 211. Circular groove; 212. Limiting ring; 213. Fixed shell; 3. Control assembly; 301. Oil inlet pipe; 302. Rubber ring; 303. Limiting roller; 304. Sealing seat; 305. Sliding groove; 306. Limiting ring; 307. Exhaust pipe; 308. Exhaust hole; 309. Connecting cylinder; 310. Telescopic spring; 311. Sports ball; 312. Connecting groove; 313. Connecting ring groove; 314. Rubber pad; 315. Filter plate; 316. Connecting hole. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] See also Figure 1-Figure 7The present invention provides a petrochemical aromatic and saturated hydrocarbon separation device, including an assembly pipe 1, a driving component 2 for driving oil to enter is provided at one end of the assembly pipe 1, a control component 3 for controlling the oil inlet rate is built into the other end of the assembly pipe 1, a connecting pipe 101 is fixedly connected to the bottom of the assembly pipe 1, and a distillation tower 102 is fixedly connected to the output end of the connecting pipe 101. Multiple components cooperate to realize intermittent oil supply, ensuring that subsequent oil distillation and separation are sufficient.

[0030] In order to realize intermittent oil extraction, a fixed shell 213 is provided in the driving component 2. The bottom of the inner cavity of the fixed shell 213 is sleeved with a motor 201. The motor 201 is fixedly connected to the fixed shell 213. The output end of the motor 201 is fixedly connected to the driving roller 202. The surface of the driving roller 202 is sleeved with an assembly disk 203. The assembly disk 203 is rotatably connected to the driving roller 202. The outer ring wall of the assembly disk 203 is fixedly connected to the inner wall of the fixed shell 213. The inner ring wall of the top of the assembly disk 203 is fixedly connected to a plurality of teeth 205. The plurality of teeth 205 are evenly distributed around the axis of the assembly disk 203. The top of the driving roller 202 is fixedly connected to a driving gear 204. , the driving gear 204 is placed on the top of the assembly disk 203 and is slidably connected to the assembly disk 203, the driving gear 204 and the assembly disk 203 axis coincide, a connecting gear 206 is provided between the driving gear 204 and the assembly disk 203, the two sides of the connecting gear 206 are respectively meshed with the driving gear 204 and the assembly disk 203, the top of the connecting gear 206 is fixedly connected to a rotating rod 207, the surface of the rotating rod 207 is sleeved with a push rod 208, one end of the push rod 208 is rotatably connected to the rotating rod 207, the end of the push rod 208 away from the rotating rod 207 is fixedly connected to a ball seat 209, the surface of the ball seat 209 is sleeved with a plug seat 210, the plug seat A circular groove 211 matching with the ball seat 209 is provided at one end of 210 close to the ball seat 209, and the ball seat 209 is placed in the circular groove 211 and slidably connected thereto. The plug seat 210 is made of rubber and is placed in the assembly tube 1. The plug seat 210 is slidably connected to the inner wall of the assembly tube 1 on all sides. A limiting ring 212 is fixedly connected to the inner wall of the assembly tube 1. A hole connecting to the oil inlet pipe 301 is provided at the bottom of the assembly tube 1. The inlet end of the connecting pipe 101 is arranged between the limiting ring 212 and the plug seat 210. The driving assembly 2 drives the driving roller 202 to rotate through the motor 201, thereby driving the gear 204 to rotate, and the driving gear 204 rotates to drive the connecting gear 2 06 rotates around the axis of the driving roller 202, and the push rod 208 on the top of the connecting gear 206 will continuously move back and forth with the movement of the connecting gear 206. At the same time, the push rod 208 will drive the plug seat 210 at the other end to move in the assembly pipe 1. The end of the plug seat 210 close to the ball seat 209 is provided with a circular groove 211 that matches it. The ball seat 209 is placed in the circular groove 211 and is slidably connected thereto to ensure the mobility of the plug seat 210. When the plug seat 210 is away from the oil inlet pipe 301, oil will be extracted. When it is close to the oil inlet pipe 301, the pipe mouth of the oil inlet pipe 301 will be closed under the control of the control component 3, and no oil will be extracted. It goes back and forth;

[0031] In order to cooperate with the driving component 2 to control the oil flow, an oil inlet pipe 301 is provided in the control component 3, one end of the oil inlet pipe 301 is fixedly connected to the assembly pipe 1, the axis of the oil inlet pipe 301 and the assembly pipe 1 coincide with each other, and a rubber ring 302 is fixedly connected to the inner wall of the end of the oil inlet pipe 301 close to the assembly pipe 1, and a plurality of limiting rollers 303 are fixedly connected to the side of the rubber ring 302 close to the plug seat 210, and the plurality of limiting rollers 303 are distributed around the axis of the rubber ring 302, and the end of the limiting roller 303 away from the rubber ring 302 is fixedly connected to the limiting ring 306, and a sealing seat 304 is provided between the plurality of limiting rollers 303, and a plurality of sliding grooves 305 matching the limiting rollers 303 are provided around the sealing seat 304, and the limiting rollers 303 are slidably connected to the groove wall of the sliding groove 305, The sealing seat 304 contacts the rubber ring 302 on one side close to the oil inlet pipe 301, and the limiting roller 303 is fixedly connected to the limiting ring 306 near one end of the assembly pipe 1. A plurality of exhaust pipes 307 are fixedly connected around the assembly pipe 1, and the plurality of exhaust pipes 307 are evenly distributed around the axis of the assembly pipe 1. One end of the exhaust pipe 307 passes through the assembly pipe 1 and extends to the outside. The exhaust pipe 307 has a plurality of exhaust holes 308 at one end outside the assembly pipe 1, and the plurality of exhaust holes 308 are evenly distributed around the axis of the exhaust pipe 307. A connecting tube 309 is fixedly connected to the bottom of the inner cavity of the exhaust pipe 307, and a telescopic spring 310 is fixedly connected to the bottom of the inner cavity of the connecting tube 309. A motion ball 311 is built into the exhaust pipe 307, and the motion ball 311 is slidably connected to the inner wall of the exhaust pipe 307. A connecting groove 312 is provided on one side close to the connecting cylinder 309, and the end of the telescopic spring 310 away from the connecting cylinder 309 contacts the bottom of the connecting groove 312, and a connecting ring groove 313 is provided around the moving ball 311, and a rubber pad 314 is built into the connecting ring groove 313. The outer ring wall of the rubber pad 314 is slidably connected to the inner wall of the exhaust pipe 307, and a filter plate 315 is provided at the air inlet end of the exhaust pipe 307. The filter plate 315 is fixedly connected to the inner wall of the exhaust pipe 307 on all sides, and a plurality of connecting holes 316 are provided on the surface of the filter plate 315. When the plug seat 210 is away from the oil inlet pipe 301, it attracts the moving balls 311 in the multiple exhaust pipes 307, and the moving seat cannot move under the limit of the filter plate 315, so that all the force acts on the multiple limiting rollers 303. On the sealing seat 304, the sealing seat 304 is close to the limiting ring 306, and the mouth of the oil inlet pipe 301 is opened, and the oil enters and enters the distillation tower 102 from the assembly pipe 1 and the connecting pipe 101 to separate the aromatic hydrocarbons and saturated hydrocarbons. When the plug seat 210 is driven by the driving component 2 to approach the oil inlet pipe 301, it is unable to attract the oil to enter. The design of the limiting roller 303 and the sealing seat 304 enables the mouth of the oil inlet pipe 301 to be opened or closed, thereby controlling the oil flow rate, and the gas in the pipe can be discharged from the multiple exhaust holes 308 by squeezing the motion ball 311. The design of the exhaust pipe 307 and the motion ball 311 can realize the discharge of the gas generated by the plug seat 210 when entering the assembly pipe 1, thereby avoiding excessive pressure affecting the normal operation of the device, and going back and forth.By realizing intermittent oil supply, the speed and flow of oil entering can be better controlled.

[0032] How it works

[0033] During actual use, the driving assembly 2 drives the driving roller 202 to rotate through the motor 201, so that the driving gear 204 rotates, and the driving gear 204 rotates to drive the connecting gear 206 to rotate around the axis of the driving roller 202. The push rod 208 on the top of the connecting gear 206 will continuously move back and forth with the movement of the connecting gear 206. At the same time, the push rod 208 will drive the plug seat 210 at the other end to move in the assembly pipe 1. The end of the plug seat 210 close to the ball seat 209 is provided with a matching circular groove 211. The ball seat 209 is placed in the circular groove 211 and is slidably connected thereto to ensure the mobility of the plug seat 210. When the plug seat 210 is away from the oil inlet pipe 301, oil will be extracted. When it is close to the oil inlet pipe 301, the pipe mouth of the oil inlet pipe 301 will be closed under the control of the control assembly 3, and no oil will be extracted. It reciprocates back and forth, and cooperates with the control assembly 3 to control the speed and flow of oil entering, so as to ensure that the subsequent oil distillation separation is sufficient. It is suitable for the separation process of aromatic hydrocarbons and saturated hydrocarbons in petrochemical industry.

[0034] When the plug seat 210 is away from the oil inlet pipe 301, it attracts the moving balls 311 in the multiple exhaust pipes 307. The moving seat cannot move due to the limit of the filter plate 315, so that all the force acts on the sealing seat 304 of the multiple limit rollers 303. The sealing seat 304 is close to the limit ring 306, and the pipe mouth of the oil inlet pipe 301 is opened. The oil enters and enters the distillation tower 102 from the assembly pipe 1 and the connecting pipe 101 to separate the aromatic hydrocarbons and saturated hydrocarbons. When the plug seat 210 is driven by the drive component 2 to approach the oil inlet pipe 301, it cannot attract the moving balls 311 in the exhaust pipes 307. The oil is introduced in, and the design of the limiting roller 303 and the sealing seat 304 enables the pipe mouth of the oil inlet pipe 301 to be opened or closed, thereby realizing the control of the oil flow, and the gas in the pipe can be discharged from the multiple exhaust holes 308 by squeezing the motion ball 311. The design of the exhaust pipe 307 and the motion ball 311 can realize the discharge of the gas generated by the plug seat 210 when entering the assembly pipe 1, avoiding excessive pressure affecting the normal operation of the device, and reciprocating back and forth to realize intermittent oil supply, which can better control the speed and flow of oil entering and improve the subsequent chemical distillation separation quality.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device, characterized by: It comprises an assembly pipe, one end of which is provided with a driving assembly for driving oil into the pipe, the other end of which is provided with a control assembly for controlling the oil inlet rate, a connecting pipe fixedly connected to the bottom of the assembly pipe, and a distillation tower fixedly connected to the output end of the connecting pipe; it is characterized in that: The drive assembly includes a fixed shell, a motor is sleeved on the bottom of the inner cavity of the fixed shell, a drive roller is fixedly connected to the output end of the motor, an assembly disk is sleeved on the surface of the drive roller, a plurality of teeth are fixedly connected to the inner ring wall at the top of the assembly disk, a drive gear is fixedly connected to the top of the drive roller, a connecting gear is provided between the drive gear and the assembly disk, and both sides of the connecting gear are meshed with the drive gear and the assembly disk respectively; The control component includes an oil inlet pipe, one end of the oil inlet pipe is fixedly connected to the assembly pipe, a rubber ring is fixedly connected to the inner wall of the end of the oil inlet pipe close to the assembly pipe, a plurality of limiting rollers are fixedly connected to the side of the rubber ring close to the plug seat, the plurality of limiting rollers are distributed around the axis of the rubber ring, the end of the limiting roller away from the rubber ring is fixedly connected to the limiting ring, a sealing seat is provided between the plurality of limiting rollers, a plurality of sliding grooves matching the limiting rollers are opened around the sealing seat, the limiting rollers are slidably connected to the sliding groove walls, and the side of the sealing seat close to the oil inlet pipe is in contact with the rubber ring; A plurality of exhaust pipes are fixedly connected around the assembly pipe, and the plurality of exhaust pipes are evenly distributed around the axis of the assembly pipe. One end of the exhaust pipe passes through the assembly pipe and extends to the outside. The exhaust pipe has a plurality of exhaust holes at one end outside the assembly pipe, and the plurality of exhaust holes are evenly distributed around the axis of the exhaust pipe. A connecting cylinder is fixedly connected to the bottom of the inner cavity of the exhaust pipe, and a telescopic spring is fixedly connected to the bottom of the inner cavity of the connecting cylinder. A motion ball is built into the exhaust pipe, and the motion ball is slidably connected to the inner wall of the exhaust pipe. A connecting groove is provided on the side of the motion ball close to the connecting cylinder, and an end of the telescopic spring away from the connecting cylinder contacts the bottom of the connecting groove. A connecting ring groove is provided around the motion ball, and a rubber pad is built into the connecting ring groove. The outer ring wall of the rubber pad is slidably connected to the inner wall of the exhaust pipe. A filter plate is provided at the air inlet end of the exhaust pipe, and the filter plate is fixedly connected to the inner wall of the exhaust pipe around it, and a plurality of connecting holes are provided on the surface of the filter plate; A rotating rod is fixedly connected to the top of the connecting gear, a push rod is sleeved on the surface of the rotating rod, one end of the push rod is rotatably connected to the rotating rod, an end of the push rod away from the rotating rod is fixedly connected to a ball seat, a plug seat is sleeved on the surface of the ball seat, and a circular groove matching the plug seat is opened at the end of the plug seat close to the ball seat, and the ball seat is placed in the circular groove and slidably connected to it.

2. The petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device according to claim 1, characterized in that: The motor is fixedly connected to the fixed shell, and the plurality of teeth are evenly distributed around the axis of the assembly tube. The driving gear is placed on the top of the assembly tube and is slidingly connected to the assembly disk. The driving gear coincides with the axis of the assembly disk. The assembly disk is rotationally connected to the driving roller, and the outer ring wall of the assembly disk is fixedly connected to the inner wall of the fixed shell.

3. The petrochemical aromatic hydrocarbon and saturated hydrocarbon separation device according to claim 1, characterized in that: The plug seat is made of rubber and is slidably connected to the inner wall of the assembly tube. The inner wall of the assembly tube is fixedly connected to a limiting ring, and the inlet end of the connecting tube is arranged between the limiting ring and the plug seat.

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