CN211886137U - Can reduce collection device of chlorobenzene tank field volatile matter - Google Patents

Abstract

A collecting device capable of reducing volatile matters in a chlorobenzene tank area comprises a plurality of finished product storage tanks, branch exhaust pipes, a main exhaust pipe, a hydraulic jet pump, an alkali absorption tank, a circulating pump, a second cooler and a pneumatic tank, wherein an outlet of the main exhaust pipe is connected with a gas phase inlet of the hydraulic jet pump, a liquid phase outlet of the hydraulic jet pump is connected with an inlet of the alkali absorption tank, an outlet of the alkali absorption tank is connected with an inlet of the circulating pump, an outlet of the circulating pump is connected with a liquid phase inlet of the hydraulic jet pump, the second cooler comprises a cooling inlet, a cooling outlet and a waste discharge port, an outlet of the pneumatic tank is connected with a cooling inlet of the second cooler, a cooling outlet of the second cooler is respectively connected with inlets at the tops of the plurality of finished product storage tanks, in the utility model, extracted chlorobenzene enters the second cooler through the pneumatic tank, and chlorobenzene cooled by the second cooler enters the finished product storage tanks again, the pressure of chlorobenzene vapor in the finished product storage tank can be greatly reduced, so that chlorobenzene vapor discharged from the breather valve is reduced.

Description

Can reduce collection device of chlorobenzene tank field volatile matter

Technical Field

The utility model relates to a chlorobenzene production facility technical field, in particular to can reduce collection device of chlorobenzene tank field volatile matter.

Background

The finished chlorobenzene product is usually stored in a finished product storage tank, chlorobenzene extracted from a rectifying tower is maintained at about 50 ℃, and after high-temperature chlorobenzene enters the finished product storage tank, the pressure in the finished product storage tank is increased, so that chlorobenzene steam is intermittently emitted from a breather valve on the finished product storage tank, the smell in a tank area is heavy, the environment pollution is caused, and chlorobenzene loss is also caused.

Disclosure of Invention

In view of the above, there is a need for a collecting device capable of reducing volatile matters in a chlorobenzene tank area and preventing chlorobenzene vapor from emitting.

A collecting device capable of reducing volatile matters in a chlorobenzene tank area comprises a plurality of finished product storage tanks, branch exhaust pipes, a main exhaust pipe, a hydraulic jet pump, an alkali absorption tank, a circulating pump, a second cooler and a pneumatic tank, wherein each finished product storage tank comprises a finished product tank body and a breather valve, the breather valve is installed at the top of the finished product tank body, an inlet of the breather valve is connected with a gas phase outlet at the top of the finished product tank body, the number of the branch exhaust pipes corresponds to that of the finished product storage tanks, one end of each branch exhaust pipe is connected with the gas phase outlet at the top of the finished product storage tank, each main exhaust pipe comprises a plurality of inlets and an outlet, the other end of each branch exhaust pipe is connected with the inlet of the corresponding main exhaust pipe, the outlet of the corresponding main exhaust pipe is connected with the gas phase inlet of the corresponding hydraulic jet pump, the liquid phase outlet of the corresponding hydraulic jet pump is connected with the, the outlet of the circulating pump is connected with the liquid phase inlet of the hydraulic jet pump, the second cooler comprises a cooling inlet, a cooling outlet and a waste discharge port, the outlet of the pneumatic groove is connected with the cooling inlet of the second cooler, the cooling outlet of the second cooler is respectively connected with inlets at the tops of the plurality of finished product storage tanks, a first valve is installed on a pipeline between the second cooler and the pneumatic groove, and a second valve is installed on a pipeline between the second cooler and the finished product storage tanks.

Preferably, the inlet of the first valve is connected to the outlet of the second valve via a pipe, and a third valve is installed on the pipe between the inlet of the first valve and the outlet of the second valve.

Preferably, a fourth valve is installed on the pipeline between the first valve, the third valve and the pneumatic groove.

Preferably, a fifth valve is mounted on a pipeline between the fourth valve and the pneumatic groove, an outlet of the pneumatic groove is connected with an outlet of the fifth valve through a pipeline, a sixth valve and a seventh valve are connected in series on a pipeline between the outlet of the pneumatic groove and an outlet of the fifth valve, and a flowmeter is mounted on a pipeline between the sixth valve and the seventh valve.

Preferably, the waste discharge port of the second cooler is connected to the inlet of the vacuum recovery pack, and an eighth valve is installed on a pipe between the second cooler and the vacuum recovery pack.

Preferably, a second sight glass is installed on a pipe between the eighth valve and the second cooler.

Preferably, the finished product tank body further comprises a first cooler, an inlet of the first cooler is connected with a gas phase outlet at the top of the finished product tank body, and an outlet of the first cooler is connected with an inlet of the breather valve.

Preferably, the alkali absorption tank comprises a first sight glass, the liquid phase outlet of the hydraulic jet pump is connected with the inlet of the first sight glass, and the outlet of the first sight glass is connected with the inlet of the alkali absorption tank.

Preferably, the collecting device capable of reducing volatile matters in the chlorobenzene tank area further comprises a plurality of pressure stabilizing components, the number of the pressure stabilizing components corresponds to the number of the branch exhaust pipes, each pressure stabilizing component comprises an outer cylinder and an inner cylinder, two ends of each outer cylinder are sealed, a first outer air port is arranged at the geometric center of one end face of each outer cylinder, an exhaust port is arranged at the other end of each outer cylinder, a second outer air port is arranged on the annular wall of each outer cylinder and is close to one end of each outer cylinder provided with the exhaust port, two ends of each inner cylinder are sealed, a first inner air port is arranged at the geometric center of one end face of each inner cylinder, a second inner air port is arranged on the annular wall of each inner cylinder, the outer diameter of each inner cylinder is equal to the inner diameter of each outer cylinder, the height of each inner cylinder is smaller than that of each outer cylinder, each inner cylinder is nested into each outer cylinder, and, interior barrel removes the one end that sets up first outer gas port to outer barrel, gas port and the outer gas port intercommunication of second in the second, interior barrel removes the one end that is equipped with the gas vent to outer barrel, gas port and the outer gas port of second do not communicate in the second, the first outer gas port and the gaseous phase exit linkage at finished product jar body top of outer barrel, the one end of the relative main vent-pipe of branch blast pipe is connected with the outer gas port of second of outer barrel, the vertical setting of axis direction of outer barrel, interior barrel, the first outer gas port of outer barrel with the first inner gas port of interior barrel is all seted up downwards.

Preferably, the pressure stabilizing component further comprises a spring and a jackscrew, a guide hole is formed in the top wall of the outer cylinder body, the jackscrew is in threaded fit with the guide hole, the lower end of the jackscrew is connected with one end of the spring, and the other end of the spring is connected with the inner cylinder body.

The utility model discloses in, the chlorobenzene of extraction gets into the second cooler through atmospheric pressure groove, and the chlorobenzene after the cooling of second cooler gets into the finished product storage tank again, can the pressure of chlorobenzene steam in the greatly reduced finished product storage tank to the chlorobenzene steam from breather valve exhaust has been reduced.

The utility model discloses the water conservancy jet pump that well sets up is connected with finished product storage tank top, utilize the negative pressure that the water conservancy jet pump produced, the chlorobenzene vapor pressure that makes in the finished product storage tank is less than the exhaust pressure of breather valve, thereby it discharges from the breather valve to have stopped chlorobenzene vapor, chlorobenzene vapor gets into the alkali absorption jar through the water conservancy jet pump, alkali lye is equipped with in the alkali absorption jar, chlorobenzene specific gravity is less than the proportion of alkali lye, colorless transparent chlorobenzene layer deposit in alkali lye upper portion, be convenient for retrieve, it is heavier to have solved jar district smell, environmental pollution's problem.

Drawings

FIG. 1 is a schematic diagram of a collection device for reducing volatiles in a chlorobenzene tank field.

Fig. 2 is a schematic diagram of the voltage stabilization part in a connected state.

Fig. 3 is a schematic diagram of the voltage stabilizing part in an off state.

Fig. 4 is a schematic diagram of the internal structure of the alkali absorption tank.

In the figure: the device comprises a finished product storage tank 10, a finished product tank body 11, a breather valve 12, a first cooler 13, a branch exhaust pipe 20, a main exhaust pipe 30, a hydraulic jet pump 40, an alkali absorption tank 50, a first sight glass 51, a first partition plate 52, a second partition plate 53, a tapered through hole 531, a floating ball 54, a circulating pump 60, a pressure stabilizing component 70, an outer cylinder 71, a first outer air port 711, a second outer air port 712, an exhaust port 713, an inner cylinder 72, a first inner air port 721, a second inner air port 722, a spring 73, a top wire 74, a second cooler 80, a second sight glass 81, an air pressure groove 90 and a vacuum recovery package 100.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Referring to fig. 1 to 4, an embodiment of the present invention provides a collecting device capable of reducing volatile matters in a chlorobenzene tank area, including a plurality of finished product storage tanks 10, branch exhaust pipes 20, a main exhaust pipe 30, a hydraulic jet pump 40, an alkali absorption tank 50, a circulation pump 60, a secondary cooler 80, and an air pressure tank 90, where each finished product storage tank 10 includes a finished product tank 11 and a breather valve 12, the breather valve 12 is installed on the top of the finished product tank 11, an inlet of the breather valve 12 is connected to a gas phase outlet on the top of the finished product tank 11, the number of the branch exhaust pipes 20 corresponds to the number of the finished product storage tanks 10, one end of the branch exhaust pipe 20 is connected to the gas phase outlet on the top of the finished product storage tank 10, the main exhaust pipe 30 includes a plurality of inlets and one outlet, the other end of the branch exhaust pipe 20 is connected to an inlet of the main exhaust pipe 30, an outlet, the liquid phase outlet of the hydraulic jet pump 40 is connected with the inlet of the alkali absorption tank 50, the outlet of the alkali absorption tank 50 is connected with the inlet of the circulating pump 60, the outlet of the circulating pump 60 is connected with the liquid phase inlet of the hydraulic jet pump 40, the second cooler 80 comprises a cooling inlet, a cooling outlet and a waste discharge port, the outlet of the pneumatic groove 90 is connected with the cooling inlet of the second cooler 80, the cooling outlet of the second cooler 80 is respectively connected with the inlets at the tops of the plurality of finished product storage tanks 10, a first valve is installed on a pipeline between the second cooler 80 and the pneumatic groove 90, and a second valve is installed on a pipeline between the second cooler 80 and the finished product storage tanks 10.

The utility model discloses in, the chlorobenzene of extraction gets into second cooler 80 through atmospheric pressure groove 90, and chlorobenzene after the cooling of second cooler 80 gets into finished product storage tank 10 again, can the pressure of chlorobenzene steam in the greatly reduced finished product storage tank 10 to the chlorobenzene steam of follow breather valve 12 exhaust has been reduced.

The utility model discloses the water conservancy jet pump 40 that well set up is connected with finished product storage tank 10 top, utilize the negative pressure that water conservancy jet pump 40 produced, make the chlorobenzene vapor pressure in the finished product storage tank 10 be less than breather valve 12's exhaust pressure, thereby it discharges from breather valve 12 to have stopped chlorobenzene vapor, chlorobenzene vapor passes through water conservancy jet pump 40 and gets into absorption alkali jar 50, alkali lye is equipped with in the absorption alkali jar 50, chlorobenzene specific gravity is less than the specific gravity of alkali lye, colorless transparent chlorobenzene layer deposit in alkali lye upper portion, be convenient for retrieve, it is heavier to have solved jar district smell, environmental pollution's problem.

Referring to fig. 1 to 4, further, an inlet of the first valve is connected to an outlet of the second valve through a pipe, and a third valve is installed on the pipe between the inlet of the first valve and the outlet of the second valve.

Referring to fig. 1 to 4, further, a fourth valve is installed on the pipe between the first valve, the third valve and the pneumatic tank 90.

Referring to fig. 1 to 4, further, a fifth valve is installed on a pipeline between the fourth valve and the pneumatic tank 90, an outlet of the pneumatic tank 90 is connected with an outlet of the fifth valve through a pipeline, a sixth valve and a seventh valve are connected in series on a pipeline between the outlet of the pneumatic tank 90 and the outlet of the fifth valve, and a flow meter is installed on a pipeline between the sixth valve and the seventh valve.

Referring to fig. 1 to 4, further, a discharge port of the second cooler 80 is connected to an inlet of the vacuum recovery package 100, and an eighth valve is installed on a pipe between the second cooler 80 and the vacuum recovery package 100.

Referring to fig. 1 to 4, further, a second sight glass 81 is installed on a pipe between the eighth valve and the second cooler 80.

Referring to fig. 1 to 4, further, the finished tank 11 further comprises a first cooler 13, an inlet of the first cooler 13 is connected with a gas phase outlet at the top of the finished tank 11, and an outlet of the first cooler 13 is connected with an inlet of the breather valve 12.

Referring to fig. 1 to 4, further, the absorption alkali tank 50 includes a first sight glass 51, the liquid phase outlet of the hydraulic jet pump 40 is connected to the inlet of the first sight glass 51, and the outlet of the first sight glass 51 is connected to the inlet of the absorption alkali tank 50.

Referring to fig. 1 to 4, further, the collecting device for volatile matters in a reduced chlorobenzene tank area further includes a plurality of pressure stabilizing members 70, the number of the pressure stabilizing members 70 corresponds to the number of the branch exhaust pipes 20, each pressure stabilizing member 70 includes an outer cylinder 71 and an inner cylinder 72, both ends of the outer cylinder 71 are closed, a first outer air port 711 is provided at a geometric center of an end surface of the outer cylinder 71, an air outlet 713 is provided at the other end of the outer cylinder 71, a second outer air port 712 is provided at an annular wall of the outer cylinder 71, the second outer air port 712 is provided near an end of the outer cylinder 71 provided with the air outlet 713, both ends of the inner cylinder 72 are closed, a first inner air port 721 is provided at a geometric center of an end surface of the inner cylinder 72, a second inner air port 722 is provided at an annular wall of the inner cylinder 72, an outer diameter of the inner cylinder 72 is equal to an inner diameter of the outer cylinder 71, a height of the inner cylinder, the outer wall of the inner cylinder 72 is connected with the inner wall of the outer cylinder 71 in a sliding and sealing manner, the inner cylinder 72 moves to one end of the outer cylinder 71 provided with a first outer air port 711, a second inner air port 722 is communicated with a second outer air port 712, the inner cylinder 72 moves to one end of the outer cylinder 71 provided with an air outlet 713, the second inner air port 722 is not communicated with the second outer air port 712, the first outer air port 711 of the outer cylinder 71 is connected with a gas phase outlet at the top of the finished product tank body 11, one end of the branch exhaust pipe 20, opposite to the main exhaust pipe 30, is connected with the second outer air port 712 of the outer cylinder 71, the axial directions of the outer cylinder 71 and the inner cylinder 72 are vertically arranged, and the first outer air port 711 of the outer cylinder 71 and the first inner air port 721.

In this embodiment, the pressure stabilizing component 70 can control the pressure inside the finished product tank 11 within a certain range, when the pressure inside the finished product tank 11 is low, the pressure of the chlorobenzene vapor inside the finished product tank 11 on the inner cylinder 72 is smaller than the gravity thereof, the inner cylinder 72 descends to the end of the outer cylinder 71 provided with the first outer air port 711, the pressure stabilizing component 70 is in a closed state, the finished product tank 11 is not communicated with the hydraulic jet pump 40, so as to prevent the finished product tank 11 from being under-pressure, when the pressure inside the finished product tank 11 is high, the pressure of the chlorobenzene vapor inside the finished product tank 11 on the inner cylinder 72 is larger than the gravity thereof, the inner cylinder 72 ascends to the end of the outer cylinder 71 provided with the air outlet 713, the finished product tank 11 is communicated with the hydraulic jet pump 40, so as to prevent the finished product tank 11 from being over-pressurized, thereby preventing the chlorobenzene.

Referring to fig. 1 to 4, further, the pressure stabilizing member 70 further includes a spring 73 and a jack screw 74, a guide hole is formed in the top wall of the outer cylinder 71, the jack screw 74 is in threaded fit with the guide hole, the lower end of the jack screw 74 is connected with one end of the spring 73, and the other end of the spring 73 is connected with the inner cylinder 72.

In this embodiment, the elastic force of the spring 73 between the inner cylinder 72 and the outer cylinder 71 is adjusted by the jackscrew 74, so that the pressure range of the chlorobenzene vapor in the finished product tank 11 corresponding to the connection or disconnection between the finished product tank 11 and the hydraulic jet pump 40 can be adjusted.

In a specific embodiment, the outlet of the first sight glass 51 is connected to the inlet at the top of the absorption alkali tank 50, and the inlet of the circulation pump 60 is connected to the inlet at the bottom of the absorption alkali tank 50.

In a specific embodiment, a first partition plate 52 is disposed in the alkali absorption tank 50, the first partition plate 52 is disposed vertically, the first partition plate 52 is parallel to a side wall of the alkali absorption tank 50, end surfaces of two sides of the first partition plate 52 are in contact with two side walls of the alkali absorption tank 50, an end surface of a top of the first partition plate 52 is in contact with a top wall of the alkali absorption tank 50, an end surface of a bottom of the first partition plate 52 is not in contact with a bottom wall of the alkali absorption tank 50, an outlet of the first sight glass 51 is communicated with a space between a left side wall of the alkali absorption tank 50 and the first partition plate 52, and an inlet of the circulation pump 60 is communicated with a space between a right side wall of the alkali absorption tank 50 and the first partition.

In a specific embodiment, a second partition plate 53 is provided in the alkali absorption tank 50, the second partition plate 53 is parallel to the top wall of the alkali absorption tank 50, the left end face of the second partition plate 53, the front end face of the second partition plate 53, and the rear end face of the second partition plate 53 are in contact with the left side wall of the alkali absorption tank 50, the front side wall of the alkali absorption tank 50, and the rear side wall of the alkali absorption tank 50, respectively, the right end face of the second partition plate 53 is in contact with the first partition plate 52, the second partition plate 53 is provided with a conical through hole 531, the side of the conical through hole 531 with larger opening is provided with a top wall of the alkali absorption box 50, a floating ball 54 is arranged in a space between the second partition plate 53 and the top wall of the alkali absorption box 50, the density of the floating ball 54 is less than that of the chlorobenzene, the density of the floating ball 54 is greater than that of the alkali liquor, the diameter of the floating ball 54 is less than that of the end with the larger opening of the conical through hole 531, and the diameter of the floating ball 54 is greater than that of the end with the smaller opening of the conical through hole 531.

In this embodiment, as the volume of the chlorobenzene between the first partition plate 52 and the second partition plate 53 is increased, the floating ball 54 gradually approaches the second partition plate 53, and when the chlorobenzene is completely filled between the first partition plate 52 and the second partition plate 53, the floating ball 54 blocks the tapered through hole 531, so that the chlorobenzene can be prevented from being pumped out by the circulating pump 60.

In one embodiment, the float 54 is connected to the top wall of the soda suction box 50 by a flexible cord.

The embodiment of the utility model provides a module or unit in the device can merge, divide and delete according to actual need.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a can reduce collection device of chlorobenzene tank field volatile matter which characterized in that: the device comprises a plurality of finished product storage tanks, branch exhaust pipes, a main exhaust pipe, a hydraulic jet pump, an alkali absorption tank, a circulating pump, a second cooler and a pneumatic tank, wherein each finished product storage tank comprises a finished product tank body and a breather valve, the breather valve is installed at the top of the finished product tank body, the inlet of the breather valve is connected with the gas phase outlet at the top of the finished product tank body, the number of the branch exhaust pipes corresponds to that of the finished product storage tanks, one end of each branch exhaust pipe is connected with the gas phase outlet at the top of the finished product storage tank, the main exhaust pipe comprises a plurality of inlets and one outlet, the other end of each branch exhaust pipe is connected with the inlet of one main exhaust pipe, the outlet of each main exhaust pipe is connected with the gas phase inlet of the hydraulic jet pump, the liquid phase outlet of the hydraulic jet pump is connected with the inlet of the alkali absorption tank, the outlet of the alkali absorption tank is, the second cooler comprises a cooling inlet, a cooling outlet and a waste discharge port, the outlet of the air pressure tank is connected with the cooling inlet of the second cooler, the cooling outlet of the second cooler is respectively connected with inlets at the tops of the plurality of finished product storage tanks, a first valve is installed on a pipeline between the second cooler and the air pressure tank, and a second valve is installed on a pipeline between the second cooler and the finished product storage tanks.

2. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 1, wherein: the inlet of the first valve is connected with the outlet of the second valve through a pipeline, and a third valve is arranged on the pipeline between the inlet of the first valve and the outlet of the second valve.

3. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 2, wherein: and a fourth valve is arranged on the pipeline between the first valve, the third valve and the pneumatic groove.

4. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 3, wherein: a fifth valve is arranged on a pipeline between the fourth valve and the pneumatic groove, an outlet of the pneumatic groove is connected with an outlet of the fifth valve through a pipeline, a sixth valve and a seventh valve are connected in series on a pipeline between the outlet of the pneumatic groove and the outlet of the fifth valve, and a flowmeter is arranged on a pipeline between the sixth valve and the seventh valve.

5. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 4, wherein: the waste discharge port of the second cooler is connected with the inlet of the vacuum recovery bag, and an eighth valve is installed on a pipeline between the second cooler and the vacuum recovery bag.

6. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 5, wherein: and a second sight glass is arranged on a pipeline between the eighth valve and the second cooler.

7. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 1, wherein: the finished product tank body further comprises a first cooler, an inlet of the first cooler is connected with a gas phase outlet at the top of the finished product tank body, and an outlet of the first cooler is connected with an inlet of a breather valve.

8. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 1, wherein: the alkali absorption tank comprises a first sight glass, a liquid phase outlet of the hydraulic jet pump is connected with an inlet of the first sight glass, and an outlet of the first sight glass is connected with an inlet of the alkali absorption tank.

9. The apparatus for collecting volatile substances in a chlorobenzene tank farm which can be reduced according to claim 1, wherein: the collecting device capable of reducing volatile matters in the chlorobenzene tank area further comprises a plurality of pressure stabilizing components, the number of the pressure stabilizing components corresponds to the number of the branch exhaust pipes, each pressure stabilizing component comprises an outer cylinder and an inner cylinder, two ends of the outer cylinder are sealed, a first outer air port is arranged at the geometric center of one end face of the outer cylinder, an exhaust port is arranged at the other end of the outer cylinder, a second outer air port is arranged on the annular wall of the outer cylinder and is close to one end of the outer cylinder provided with the exhaust port, two ends of the inner cylinder are sealed, a first inner air port is arranged at the geometric center of one end face of the inner cylinder, a second inner air port is arranged on the annular wall of the inner cylinder, the outer diameter of the inner cylinder is equal to the inner diameter of the outer cylinder, the height of the inner cylinder is smaller than that of the outer cylinder, the inner cylinder is nested in the outer cylinder, interior barrel removes the one end that sets up first outer gas port to outer barrel, gas port and the outer gas port intercommunication of second in the second, interior barrel removes the one end that is equipped with the gas vent to outer barrel, gas port and the outer gas port of second do not communicate in the second, the first outer gas port and the gaseous phase exit linkage at finished product jar body top of outer barrel, the one end of the relative main vent-pipe of branch blast pipe is connected with the outer gas port of second of outer barrel, the vertical setting of axis direction of outer barrel, interior barrel, the first outer gas port of outer barrel with the first inner gas port of interior barrel is all seted up downwards.

10. The apparatus of claim 9, wherein the apparatus comprises: the pressure stabilizing component further comprises a spring and a jackscrew, a guide hole is formed in the top wall of the outer barrel, the jackscrew is in threaded fit with the guide hole, the lower end of the jackscrew is connected with one end of the spring, and the other end of the spring is connected with the inner barrel.

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