CN215109471U - Single-screw pump and integrated mechanical sealing device used for same - Google Patents

Abstract

The utility model belongs to the technical field of the screw pump, specifically disclose a single-screw pump and be used for its collection dress formula mechanical seal device, aim at improving the assembly efficiency of above-mentioned collection dress formula mechanical seal device when using on single-screw pump. According to the integrated mechanical sealing device, the working length positioning groove is formed in the shaft sleeve, the detachable limiting piece is arranged in the working length positioning groove, the spring seat, the spring, the movable ring assembly and the static ring assembly are arranged between the shaft shoulder and the limiting piece, the spring is in a pre-tightening state, and then the static ring assembly and the limiting piece are detachably connected for pre-fixing, so that the pre-assembled integrated mechanical sealing device is ensured to be in a better working length; the fixed ring assembly is applied to the single-screw pump, the fixed ring assembly is directly fixed between the medium end shell and the air end shell, the limiting part is unscrewed or detached, the working length of the integrated mechanical sealing device can be guaranteed to be in a good state, the assembly is very convenient, the debugging time is not needed to be spent, and the assembly efficiency is greatly improved.

Description

Single-screw pump and integrated mechanical sealing device used for same

Technical Field

The utility model belongs to the technical field of the screw pump, concretely relates to single-screw pump and be used for its collection dress formula mechanical seal device.

Background

The single screw pump belongs to a rotor type displacement pump, and is characterized by that the screw and lining are mutually meshed to produce volume change in suction cavity and discharge cavity to transfer liquid. Because the motion of the rotor of the single-screw pump is a planetary track, the rotor needs to do swinging motion, the swinging of the transmission shaft close to the mechanical seal is often overlarge, the sealing requirement of the mechanical seal exceeds the sealing capability of the mechanical seal, and the mechanical seal leaks, so that the requirements on corrosion resistance, strength, rigidity and the like of the transmission shaft are higher, the types of raw materials used for manufacturing the transmission shaft are more, the production period from material preparation to machining and forming is long, and the cost is higher. In addition, the mechanical seal for the existing single screw pump is mostly of a split type structure, when the split type mechanical seal is assembled, due to the fact that the skill level of workers is different, assembly measurement errors and the like, the working length of the installed mechanical seal is often improper, a large amount of time is spent for debugging, the assembly efficiency is very low, and the mechanical seal is very inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model provides a collection dress formula mechanical seal device for single-screw pump aims at improving its assembly efficiency when using on single-screw pump.

The utility model provides a technical scheme that its technical problem adopted is: the integrated mechanical sealing device for the single-screw pump comprises a rubber sheath and a shaft sleeve, wherein a shaft shoulder and a locking structure are respectively arranged at the front end and the rear end of the shaft sleeve, and the rear end of the rubber sheath is hermetically sealed and connected on the shaft shoulder; the device also comprises a spring seat, a spring, a movable ring component, a static ring component and a limiting component;

the shaft sleeve is provided with a working length positioning groove, the working length positioning groove is positioned between the shaft shoulder and the locking structure, and the limiting part is detachably arranged in the working length positioning groove;

the spring seat, the spring, the movable ring assembly and the static ring assembly are sequentially sleeved on the shaft sleeve from front to back and are located between the shaft shoulder and the limiting part, and the static ring assembly and the limiting part are detachably connected together to enable the spring to be in a pre-tightening state.

Furthermore, the rear end of the rubber sheath is fastened and fixed on the shaft shoulder through a first cable tie.

Further, locking structure includes that at least two establish the first locking screw on the lateral wall of axle sleeve rear end, threaded connection has retaining member subassembly in the first locking screw.

Furthermore, all the first locking screw holes are uniformly distributed along the circumferential direction of the shaft sleeve.

Further, the locking member assembly includes a first set screw threadedly mounted in the locking screw bore, and a locking ring threadedly coupled to the exposed end of the first set screw.

Further, a seat ring table is arranged on the spring seat, at least two second locking screw holes are formed in the seat ring table, and second set screws are connected to the second locking screw holes in a threaded mode; the front end of the spring is sleeved on the spring seat and is abutted against the rear end face of the seat ring platform.

Further, the movable ring assembly comprises a movable ring seat and a movable ring; the front end and the rear end of the movable ring seat are respectively provided with an outer ring table and an inner ring table, the movable ring seat is sleeved on the shaft sleeve, and the rear end of the spring is sleeved on the front end of the movable ring seat and is abutted against the outer ring table; the movable ring is sleeved on the shaft sleeve, and the front end of the movable ring is matched and connected with the rear end of the movable ring seat.

Furthermore, an annular groove is formed in the inner wall of the movable ring seat, and a first sealing ring is arranged in the annular groove.

Further, the static ring assembly comprises a static ring seat, a static ring and a static ring gland; the static ring seat is provided with a static ring groove, and the front end of the static ring groove is provided with a groove ring platform; the front end and the rear end of the static ring are respectively sleeved with a second sealing ring and a third sealing ring, and the static ring is embedded in the static ring groove and is abutted against the groove ring platform through the second sealing ring; the stationary ring gland is installed on the rear end of the stationary ring seat through a first connecting piece and is detachably connected with the limiting piece through a second connecting piece, and the compressing front end of the stationary ring gland extends into the stationary ring groove and is compressed on the third sealing ring.

The utility model also provides a single screw pump with better sealing performance and convenient assembly, which comprises a medium end shell and an air end shell which are connected together, a connector arranged in the medium end shell and a transmission shaft arranged in the air end shell, wherein the front end of the transmission shaft extends into the medium end shell and is coaxially connected with the connector; the device also comprises a cartridge type mechanical sealing device; the integrated mechanical sealing device comprises a rubber sheath, a shaft sleeve, a spring seat, a spring, a movable ring assembly and a static ring assembly;

the front end and the rear end of the shaft sleeve are respectively provided with a shaft shoulder and a locking structure, the shaft sleeve is also provided with a working length positioning groove, and the working length positioning groove is positioned between the shaft shoulder and the locking structure;

the shaft sleeve is sleeved on the transmission shaft and fixed with the transmission shaft through the locking structure, the front end of the shaft sleeve is arranged close to the connector, the rubber sheath is sleeved at a gap between the shaft sleeve and the connector, the front end of the rubber sheath is hermetically sleeved on the rear end of the connector and is fastened and fixed through a second binding belt, and the rear end of the rubber sheath is hermetically sleeved on a shaft shoulder and is fastened and fixed through a first binding belt;

the spring seat, the spring, the movable ring assembly and the static ring assembly are sequentially sleeved on the shaft sleeve from front to back and are positioned between the shaft shoulder and the working length positioning groove; the static ring component is arranged close to the working length positioning groove and fixed between the medium end shell and the air end shell, and the spring is in a pre-tightening state.

The utility model has the advantages that: according to the integrated mechanical sealing device, the working length positioning groove is formed in the shaft sleeve, the detachable limiting piece is arranged in the working length positioning groove, the spring seat, the spring, the movable ring assembly and the static ring assembly are arranged between the shaft shoulder and the limiting piece, the spring is in a pre-tightening state, and then the static ring assembly and the limiting piece are detachably connected for pre-fixing, so that the pre-assembled integrated mechanical sealing device is ensured to be in a better working length; the single-screw pump sealing device is applied to a single-screw pump, the shaft sleeve is sleeved on a transmission shaft, the rubber sheath is sleeved at the gap between the shaft sleeve and a connector, the static ring assembly is directly fixed between a medium end shell and an air end shell of the single-screw pump, the limiting part is unscrewed or detached, the working length of the integrated mechanical sealing device can be guaranteed to be in a good state, the assembly is very convenient, the time for debugging the working length of the mechanical seal is not needed, and the assembly efficiency is greatly improved. The single-screw pump provided with the integrated mechanical sealing device is convenient to assemble, the rubber sheath can effectively separate the medium in the medium end shell from the transmission shaft, the transmission shaft is buffered through the spring, the movable ring assembly and the stationary ring assembly are always tightly attached, the sealing effectiveness is ensured, the transmission shaft is basically prevented from being influenced by the medium, the transmission shaft is made of common alloy steel meeting the requirements of strength and rigidity, raw materials for manufacturing the transmission shaft are reduced, the manufacturing difficulty of the transmission shaft is reduced, batch material preparation production is facilitated, the production period is shortened, and the cost is saved.

Drawings

Fig. 1 is a schematic view of an implementation structure of a center-loading type mechanical sealing device of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of an embodiment of a single-screw pump according to the present invention;

labeled as: the rubber sleeve comprises a rubber sheath 10, a first cable tie 11, a second cable tie 12, a shaft sleeve 20, a shaft shoulder 21, a first locking screw hole 22, a first locking screw 23, a locking ring 24, a working length positioning groove 25, a spring seat 30, a second locking screw hole 31, a second locking screw 32, a spring 40, a movable ring seat 51, a movable ring 52, a first sealing ring 53, a stationary ring seat 61, a stationary ring 62, a stationary ring gland 63, a second sealing ring 64, a third sealing ring 65, a first connecting piece 66, a second connecting piece 67, a limiting piece 70, a connecting head 80 and a transmission shaft 90.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1 and 2, the integrated mechanical sealing device for a single-screw pump includes a rubber sheath 10 and a shaft sleeve 20, wherein a shaft shoulder 21 and a locking structure are respectively disposed at the front end and the rear end of the shaft sleeve 20, and the rear end of the rubber sheath 10 is hermetically sealed on the shaft shoulder 21; the device also comprises a spring seat 30, a spring 40, a movable ring component, a static ring component and a limiting component 70;

the shaft sleeve 20 is provided with a working length positioning groove 25, the working length positioning groove 25 is positioned between the shaft shoulder 21 and the locking structure, and the limiting member 70 is detachably arranged in the working length positioning groove 25;

the spring seat 30, the spring 40, the moving ring assembly and the static ring assembly are sequentially sleeved on the shaft sleeve 20 from front to back and are located between the shaft shoulder 21 and the limiting piece 70, and the static ring assembly and the limiting piece 70 are detachably connected together, so that the spring 40 is in a pre-tightening state.

Above-mentioned collection dress formula mechanical seal device is split type mechanical seal, it is through seting up working length constant head tank 25 on axle sleeve 20, and set up detachable locating part 70 in working length constant head tank 25, simultaneously with spring holder 30, spring 40, rotating ring subassembly and quiet ring subassembly dress between shaft shoulder 21 and locating part 70, make spring 40 be in the pretension state, again can dismantle the link together with locating part 70 and carry out the pre-fixing, therefore guarantee that the collection dress formula mechanical seal device of pre-installation is in preferred working length, thereby be convenient for use its assembly at single screw pump, the time of debugging machine seal working length has been saved, assembly efficiency has been improved.

The end of the sleeve 20 which needs to extend into the medium end shell of the single-screw pump is taken as a front end, and the front end of the sleeve 20 faces to the front side direction, for example: the left direction in fig. 1 means the front direction; the direction opposite to the front direction is the rear direction, and for example, the right direction in fig. 1 indicates the rear direction.

The rubber sheath 10 is a protective part which is used for being sleeved at a gap between the shaft sleeve 20 and the connector 80 so as to prevent a medium from leaking from the gap and corroding the transmission shaft 90, and annular protrusions are generally arranged at the front end and the rear end of the inner wall of the rubber sheath 10 respectively and are used for being nested and connected with annular grooves formed in the connector 80 or the shaft shoulder 21; the rear end of the rubber sheath 10 is sleeved on the shaft shoulder 21 and forms a seal with the shaft shoulder 21 by utilizing the elastic contraction effect of the rubber sheath, in order to ensure a good sealing sleeving effect, as shown in fig. 1, the rear end of the rubber sheath 10 is tightly bound and fixed on the shaft shoulder 21 through a first binding belt 11, and the first binding belt 11 is generally bound at least one circle around the sleeving part of the rubber sheath 10 and the shaft shoulder 21 to form a fixing structure.

The sleeve 20 is a member for sealing and protecting the front end of the transmission shaft 90, which is generally disposed adjacent to the joint head 80, and the sleeve 20 is generally spaced from the joint head 80 by a distance not exceeding 5 mm; in the case of a single screw pump, the sleeve 20 is typically secured to the drive shaft 90 by a locking arrangement; the locking structure can be various, for example: a screw locking structure, a pin locking structure, a key connection structure, a flange connection structure and the like; to facilitate the locking of the sleeve 20 to the drive shaft 90, as shown in fig. 1, the locking structure includes at least two first locking screw holes 22 formed in the rear end side wall of the sleeve 20, and locking member assemblies are threadedly coupled to the first locking screw holes 22.

In addition to the above, in order to improve the locking and fixing effect on the sleeve 20, it is preferable that the first locking screw holes 22 are uniformly distributed along the circumferential direction of the sleeve 20. The retaining member assembly can be of various types, for example: set screws, bolts, etc. Specifically, the locker assembly includes a first set screw 23 threadedly mounted in the locking screw hole 22, and a locking ring 24 threadedly coupled to an exposed end of the first set screw 23. This retaining member subassembly simple structure, simple to operate, locking ring 24 can carry out the interlocking with axle sleeve 20, has improved the fixed effect of locking greatly.

Spring seat 30 is an annular member for fitting spring 40; the spring 40 is mainly used for buffering the vibration of the transmission shaft 90 and ensuring that the movable ring assembly and the static ring assembly are always abutted to form good sealing. In order to facilitate installation of the spring 40 and avoid distortion and reduction of service life of the spring 40 in the use process, as shown in fig. 1, a seat ring table is arranged on the spring seat 30, at least two second locking screw holes 31 are arranged on the seat ring table, and second set screws 32 are connected in the second locking screw holes 31 through threads; the front end of the spring 40 is sleeved on the spring seat 30 and is abutted against the rear end face of the seat ring platform. In order to improve the locking and fixing effect of the spring seat 30, it is preferable that the second locking screw holes 31 be uniformly distributed along the circumferential direction of the spring seat 30.

The rotating ring assembly can move along the axial direction of the shaft sleeve 20, the static ring assembly is fixedly mounted on the single-screw pump, and the rotating ring assembly and the static ring assembly are always attached to ensure the sealing effectiveness of the integrated mechanical sealing device.

Specifically, as shown in fig. 1 again, the rotating ring assembly includes a rotating ring seat 51 and a rotating ring 52; the front end and the rear end of the movable ring seat 51 are respectively provided with an outer ring platform and an inner ring platform, the movable ring seat 51 is sleeved on the shaft sleeve 20, and the rear end of the spring 40 is sleeved on the front end of the movable ring seat 51 and is abutted against the outer ring platform; the movable ring 52 is sleeved on the shaft sleeve 20, and the front end of the movable ring 52 is matched and connected with the rear end of the movable ring seat 51. The movable ring seat 51 is used for installing the spring 40 and the movable ring 52, the movable ring seat 51 has good strength and rigidity, and the movable ring 52 can be effectively fixed by arranging an inner ring platform at the rear end of the movable ring seat 51 and matching and connecting the front end of the movable ring 52 with the rear end of the movable ring seat 51; the rotating ring 52 is the component that contacts the stationary ring assembly to form a seal, and the rotating ring 52 is typically made of a wear resistant material.

In order to ensure the sealing between the moving ring seat 51 and the sleeve 20, an annular groove is generally provided on the inner wall of the moving ring seat 51, and a first sealing ring 53 is provided in the annular groove.

In order to facilitate the fixed installation of the integrated mechanical sealing device and the single-screw pump together and ensure the sealing performance of the static ring assembly and the shaft sleeve 20 at the installation position, as shown in fig. 1, the static ring assembly comprises a static ring seat 61, a static ring 62 and a static ring gland 63; a static ring groove is formed in the static ring seat 61, and a groove ring platform is arranged at the front end of the static ring groove; the front end and the rear end of the static ring 62 are respectively sleeved with a second sealing ring 64 and a third sealing ring 65, and the static ring 62 is embedded in the static ring groove and is abutted against the groove ring platform through the second sealing ring 64; the stationary ring gland 63 is installed on the rear end of the stationary ring seat 61 through a first connecting piece 66 and detachably connected with a limiting piece 70 through a second connecting piece 67, and the compressing front end of the stationary ring gland 63 extends into the stationary ring groove and is compressed on the third sealing ring 65. The first connector 66 and the second connector 67 may be various, for example: screws, bolts, threaded rods, etc.

The limiting member 70 is a temporary limiting fixing member, and is generally fixed on the stationary ring gland 63 through the second connecting member 67 during assembly, and the second connecting member 67 is not screwed at the moment; then, the spring seat 30, the spring 40, the movable ring assembly and the stationary ring assembly are sequentially sleeved on the shaft sleeve 20 from front to back, the stationary ring assembly is further pressed to pre-tighten the spring 40, and the position of the limiting piece 70 is enabled to be in positive correspondence with the working length positioning groove 25; finally, the limiting member 70 is rotated into the working length positioning groove 25, and the second connecting member 67 is screwed down, so that the pre-installation of the cartridge mechanical seal device can be completed, and the working length of the cartridge mechanical seal device can be ensured. When the integrated mechanical sealing device is applied to a single-screw pump, after other components are assembled, the limiting piece 70 is rotated out of the working length positioning groove 25, or the limiting piece 70 is disassembled, so that the working length of the integrated mechanical sealing device can be ensured to be in a good state.

As shown in fig. 3, the single-screw pump includes a medium-end housing and an air-end housing connected together, and a coupling head 80 disposed in the medium-end housing and a transmission shaft 90 disposed in the air-end housing, the front end of the transmission shaft 90 extending into the medium-end housing and coaxially connected together with the coupling head 80; the device also comprises a cartridge type mechanical sealing device; the integrated mechanical sealing device comprises a rubber sheath 10, a shaft sleeve 20, a spring seat 30, a spring 40, a movable ring assembly and a static ring assembly;

a shaft shoulder 21 and a locking structure are respectively arranged at the front end and the rear end of the shaft sleeve 20, a working length positioning groove 25 is also arranged on the shaft sleeve 20, and the working length positioning groove 25 is positioned between the shaft shoulder 21 and the locking structure;

the shaft sleeve 20 is sleeved on the transmission shaft 90 and fixed with the transmission shaft 90 through a locking structure, the front end of the shaft sleeve 20 is arranged close to the connector 80, the rubber sheath 10 is sleeved at a gap between the shaft sleeve 20 and the connector 80, the front end of the rubber sheath 10 is hermetically sleeved on the rear end of the connector 80 and is fastened and fixed through a second binding belt 12, and the rear end of the rubber sheath 10 is hermetically sleeved on the shaft shoulder 21 and is fastened and fixed through a first binding belt 11;

the spring seat 30, the spring 40, the movable ring assembly and the static ring assembly are sequentially sleeved on the shaft sleeve 20 from front to back and are positioned between the shaft shoulder 21 and the working length positioning groove 25; the stationary ring assembly is disposed adjacent to the working length positioning slot 25 and fixed between the medium end housing and the air end housing, and the spring 40 is in a pre-tightening state.

The single-screw pump is provided with the integrated mechanical sealing device provided by the utility model, because the integrated mechanical sealing device is an integrated component with a better working length, the integrated mechanical sealing device is sleeved on the transmission shaft 90 through the shaft sleeve 20, and is sleeved at the gap between the shaft sleeve 20 and the connector 80 through the rubber sheath 10, the static ring component is directly fixed between the medium end shell and the air end shell of the single-screw pump, and the working length of the integrated mechanical sealing device can be ensured to be in a good state by unscrewing or removing the limiting part 70; moreover, the rubber sheath 10 can effectively separate the medium in the medium end shell from the transmission shaft 90, and the vibration of the transmission shaft 90 is buffered through the spring 40, meanwhile, the movable ring component and the static ring component are always tightly attached, the sealing effectiveness is ensured, the transmission shaft 90 is basically prevented from being influenced by the medium, the transmission shaft 90 is made of common alloy steel meeting the requirements of strength and rigidity, the production period is favorably shortened, and the production cost is saved.

Claims (10)

1. The integrated mechanical sealing device for the single-screw pump comprises a rubber sheath (10) and a shaft sleeve (20), wherein a shaft shoulder (21) and a locking structure are respectively arranged at the front end and the rear end of the shaft sleeve (20), and the rear end of the rubber sheath (10) is hermetically sealed and connected on the shaft shoulder (21); the method is characterized in that: the device also comprises a spring seat (30), a spring (40), a movable ring component, a fixed ring component and a limiting piece (70);

the shaft sleeve (20) is provided with a working length positioning groove (25), the working length positioning groove (25) is positioned between the shaft shoulder (21) and the locking structure, and the limiting piece (70) is detachably arranged in the working length positioning groove (25);

the spring seat (30), the spring (40), the movable ring assembly and the static ring assembly are sequentially sleeved on the shaft sleeve (20) from front to back and are located between the shaft shoulder (21) and the limiting piece (70), the static ring assembly and the limiting piece (70) are detachably connected together, and the spring (40) is in a pre-tightening state.

2. The integrated mechanical seal device for a mono-screw pump according to claim 1, wherein: the rear end of the rubber sheath (10) is fastened and fixed on the shaft shoulder (21) through a first cable tie (11).

3. The integrated mechanical seal device for a mono-screw pump according to claim 1, wherein: the locking structure comprises at least two first locking screw holes (22) formed in the side wall of the rear end of the shaft sleeve (20), and locking piece components are connected in the first locking screw holes (22) in a threaded mode.

4. The integrated mechanical seal device for a mono-screw pump according to claim 3, wherein: the first locking screw holes (22) are uniformly distributed along the circumferential direction of the shaft sleeve (20).

5. The integrated mechanical seal device for a mono-screw pump according to claim 3, wherein: the locking member assembly includes a first set screw (23) threadedly mounted in the locking screw hole (22), and a locking ring (24) threadedly coupled to an exposed end of the first set screw (23).

6. The integrated mechanical seal device for a mono-screw pump according to claim 1, wherein: a seat ring table is arranged on the spring seat (30), at least two second locking screw holes (31) are formed in the seat ring table, and second set screws (32) are connected in the second locking screw holes (31) in a threaded mode; the front end of the spring (40) is sleeved on the spring seat (30) and is abutted against the rear end face of the seat ring platform.

7. The integrated mechanical seal device for a mono-screw pump according to any one of claims 1 to 6, wherein: the movable ring assembly comprises a movable ring seat (51) and a movable ring (52); the front end and the rear end of the movable ring seat (51) are respectively provided with an outer ring platform and an inner ring platform, the movable ring seat (51) is sleeved on the shaft sleeve (20), and the rear end of the spring (40) is sleeved on the front end of the movable ring seat (51) and is abutted against the outer ring platform; the movable ring (52) is sleeved on the shaft sleeve (20), and the front end of the movable ring is matched and connected with the rear end of the movable ring seat (51).

8. The integrated mechanical seal device for a mono-screw pump according to claim 7, wherein: an annular groove is formed in the inner wall of the movable ring seat (51), and a first sealing ring (53) is arranged in the annular groove.

9. The integrated mechanical seal device for a mono-screw pump according to claim 7, wherein: the static ring assembly comprises a static ring seat (61), a static ring (62) and a static ring gland (63); a static ring groove is formed in the static ring seat (61), and a groove ring platform is arranged at the front end of the static ring groove; the front end and the rear end of the static ring (62) are respectively sleeved with a second sealing ring (64) and a third sealing ring (65), and the static ring (62) is embedded in the static ring groove and is abutted against the groove ring platform through the second sealing ring (64); the stationary ring gland (63) is installed on the rear end of the stationary ring seat (61) through the first connecting piece (66) and is detachably connected with the limiting piece (70) through the second connecting piece (67), and the compressing front end of the stationary ring gland (63) extends into the stationary ring groove and is compressed on the third sealing ring (65).

10. The single-screw pump comprises a medium end shell and an air end shell which are connected together, a connector (80) arranged in the medium end shell and a transmission shaft (90) arranged in the air end shell, wherein the front end of the transmission shaft (90) extends into the medium end shell and is coaxially connected with the connector (80); the method is characterized in that: the device also comprises a cartridge type mechanical sealing device; the cartridge mechanical sealing device comprises a rubber sheath (10), a shaft sleeve (20), a spring seat (30), a spring (40), a movable ring assembly and a static ring assembly;

a shaft shoulder (21) and a locking structure are respectively arranged at the front end and the rear end of the shaft sleeve (20), a working length positioning groove (25) is further arranged on the shaft sleeve (20), and the working length positioning groove (25) is positioned between the shaft shoulder (21) and the locking structure;

the novel electric wrench is characterized in that the shaft sleeve (20) is sleeved on the transmission shaft (90) and fixed with the transmission shaft (90) through a locking structure, the front end of the shaft sleeve (20) is close to the connector (80), the rubber sheath (10) is sleeved at a gap between the shaft sleeve (20) and the connector (80), the front end of the rubber sheath (10) is hermetically sealed and connected to the rear end of the connector (80) and is fastened and fixed through a second binding belt (12), and the rear end of the rubber sheath (10) is hermetically sealed and connected to the shaft shoulder (21) and is fastened and fixed through a first binding belt (11);

the spring seat (30), the spring (40), the movable ring assembly and the static ring assembly are sequentially sleeved on the shaft sleeve (20) from front to back and are positioned between the shaft shoulder (21) and the working length positioning groove (25); the static ring component is arranged close to the working length positioning groove (25) and fixed between the medium end shell and the air end shell, and the spring (40) is in a pre-tightening state.

Images