Valve pipeline connecting piece

Abstract

The invention provides a valve pipeline connecting piece, which belongs to the technical field of pipeline connecting pieces and comprises a connecting pipe, an air sleeve and an air bag, the air sleeve and the air bag are arranged on the connecting pipe, and symmetrical positioning grooves are formed in the inner walls of the two ends of the connecting pipe. According to the pipeline anti-skid device, the anti-skid pieces on the outer side of the air bag tightly abut against the outer wall of the pipeline during expansion, so that the friction force between the air bag and the pipeline is increased, and connection between the air bag and the pipeline is enhanced; an air channel is matched with a through hole and a mounting groove, so that air pressure in a positioning sleeve is increased while air is supplied to an air sleeve, the positioning sleeve is forced to stretch a first spring to slide, the positioning sleeve enters a hole in a flange ring, and the position of a pipeline is further fixed; the sealing assembly is matched with the multiple sealing blocks arranged at one end of the air bag to seal the openings in the two ends of the connecting pipe, the internal air bag is protected, the situation that the two ends of the air bag are directly exposed in air and damaged, and consequently air leakage influences the connecting strength is avoided, and the connecting strength between the connecting pipe and the pipeline is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline connectors, and in particular to a valve pipeline connector. Background Art

[0002] Valve pipe connectors are key components used to connect valves to pipeline systems. They ensure the continuity and controllability of fluid transmission. In traditional pipeline systems, valves and pipe connectors are usually two independent components that need to be installed and maintained separately. This separate structure not only increases installation costs and time, but also may cause installation difficulties in space-constrained environments. In addition, since the interface between the valve and the connector may become a leakage point, the sealing performance requirements are higher.

[0003] In the prior art, valves and pipelines are generally connected by fitting flange rings and fixing them with bolts, or by clamps and ferrules. However, the fixing methods of the above-mentioned connectors all require fixing with bolts. When disassembling the valve and pipeline, it takes a lot of time to disassemble and fix the bolts, which is time-consuming. At the same time, the bolt fixing parts are prone to rust in a humid environment for a long time, which makes it difficult to remove the bolts for disassembly, affecting the subsequent disassembly and assembly speed. How to invent a valve pipeline connector to solve these problems has become an urgent problem for technicians in this field. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a valve-pipe connector, which aims to solve the problem that fixing the valve and the pipeline with bolts is time-consuming, and the bolt fixing parts are prone to rust when placed in a humid environment for a long time, making it difficult to remove the bolts for disassembly.

[0005] The present invention is achieved in that:

[0006] The present invention provides a valve pipe connector, comprising a connecting pipe and an air sleeve and an air bag arranged on the connecting pipe, wherein symmetrical positioning grooves are provided on the inner walls at both ends of the connecting pipe, a fixing groove is provided on the inner side wall of the connecting pipe close to the positioning groove, a plurality of air passages are provided on the side wall of the connecting pipe, a through hole communicating at both ends is provided at one end of the air passage, an installation groove is provided on the inner wall of the through hole, a first spring and a positioning sleeve are installed at one end of the installation groove, pipes are installed on the inner walls at both ends of the connecting pipe, a flange ring is installed at one end of the pipe, and annular grooves are provided on the side walls at both ends of the pipe;

[0007] The gas sleeve is installed on the outer wall of the connecting pipe, the interior of the gas sleeve is connected to the airway, and the side wall of the gas sleeve is installed with a gas nozzle;

[0008] The airbag is installed on the inner wall of the fixing groove, a gas pipe connected to the inside of the air sleeve is installed on one side wall of the airbag, a plurality of positioning blocks are installed on the side walls at both ends of the airbag, and a plurality of sealing blocks are installed on one end of the airbag.

[0009] Preferably, the side walls at both ends of the first spring are fixedly connected to the inner wall of the installation groove and one end of the positioning sleeve respectively, and the outer wall of the positioning sleeve is slidably connected to the inner wall of the installation groove.

[0010] Preferably, one of the pipelines and the valve is integrated, the positioning hole and the mounting groove on the flange ring are located on the same axis, and the inner wall of the flange ring and the outer wall of the positioning sleeve are plugged into each other.

[0011] Preferably, the inner wall of the air sleeve is fixedly connected to the outer wall of the connecting pipe, the air nozzle is opened during inflation and deflation, and one end of the sealing block abuts against the side wall of the pipe when the airbag is inflated.

[0012] Preferably, the curved outer wall of the airbag is fixedly connected to the inner wall of the fixing groove, one end of a plurality of the positioning blocks abuts the inner wall of the annular groove, and the side wall of the airbag is provided with a plurality of anti-slip sheets abutting against the outer wall of the pipe.

[0013] By adopting the above technical scheme, when connecting the valve and the external pipeline, the two ends of the valve and the pipeline are respectively inserted into the two ends of the connecting pipe, and the inside of the air sleeve is inflated so that the anti-slip sheet on the outside of the airbag and the outer wall of the pipeline are tightly pressed together, thereby increasing the friction between the airbag and the pipeline and strengthening the connection between the airbag and the pipeline. The multiple positioning blocks on the side walls at both ends of the airbag extend into the annular grooves provided on the side walls at both ends of the pipeline to achieve the clamping connection between the positioning blocks and the annular grooves, limit the vertical direction of the pipeline, avoid the pipeline from loosening in the connecting pipe after installation, and improve the strength of the connection.

[0014] Preferably, the inner walls at both ends of the connecting pipe are provided with a plurality of axially symmetrical sliding grooves, and the side walls at both ends of the connecting pipe are installed with sealing assemblies, which are composed of an annular tube, a fixed tube, a limiting ring, a piston rod, a fan block, a connecting tube and a second spring.

[0015] Preferably, the outer wall of the fan block and the inner wall of the slide groove are slidably connected, a plurality of the fan blocks and the sealing block cooperate to seal both ends of the connecting pipe, and one end of the fan block is fixedly connected to one end of the piston rod.

[0016] Preferably, the interior of the annular tube is connected and fixed to a plurality of connecting tubes, one end of the connecting tube is connected and fixed to the inner wall of the air sleeve, a plurality of fixed tubes are connected and fixed to the inner wall of the annular tube, and the other end of the fixed tube is connected and fixed to the inner wall of the slide groove.

[0017] Preferably, the inner wall of the fixed tube is fixedly connected to the outer wall of the limiting ring, the two ends of the second spring are respectively fixedly connected to the limiting ring and one end of the piston rod, and the outer wall of the piston rod is piston-connected to the inner wall of the fixed tube.

[0018] By adopting the above technical scheme, while the air sleeve is inflated, multiple sealing blocks at one end of the airbag move from the fixed groove to the outside until they are against the inner wall of the connecting tube close to the fixed groove during the expansion process, and the other end of the airbag is against the outer wall of the pipeline. At the same time, the gas in the air sleeve enters the annular tube through multiple connecting tubes. The gas entering the annular tube squeezes the piston rod on the inner wall of the fixed tube, causing it to stretch the second spring to move toward one end of the slide groove. The second spring is set to quickly reset the position of the fan block when the pipeline is disassembled for subsequent exhaust. During the movement of the piston rod, the fan block at one end of the fan block located in the slide groove moves outward until one end of the fan block is against the outer wall of the pipeline. At this time, the multiple fan blocks and the sealing blocks are spaced apart to seal the openings at both ends of the connecting tube, so as to protect the internal airbag, avoid the two ends of the airbag being directly exposed to the air and being damaged, causing leakage, affecting the strength of the connection, and further improve the connection strength between the connecting tube and the pipeline.

[0019] The beneficial effects of the present invention are:

[0020] The anti-slip sheet on the outside of the airbag presses tightly against the outer wall of the pipe when it is inflated, thereby increasing the friction between the airbag and the pipe, strengthening the connection between the airbag and the pipe, and preventing the pipe from loosening after fixation. The positioning blocks installed on the side walls at both ends of the airbag cooperate with the annular grooves provided on the side walls at both ends of the pipe. When the airbag is inflated, the positioning blocks extend into the annular grooves to achieve the clamping connection between the positioning blocks and the annular grooves, and limit the vertical direction of the pipe to prevent the pipe from loosening in the connecting pipe after installation. At the same time, the pipe can be quickly connected through the connecting parts by inflation and deflation, thereby increasing the speed of disassembly and assembly.

[0021] The air passage matching through hole and the mounting groove provide air supply to the air sleeve, so that the air pressure inside the positioning sleeve is increased, forcing the positioning sleeve to stretch the first spring to slide, so that the positioning sleeve enters the hole in the flange ring, further fixing the position of the pipeline, and preventing the pipeline from rotating in the connecting pipe to affect the strength of the connection;

[0022] The sealing assembly cooperates with the multiple sealing blocks set at one end of the airbag to seal the openings at both ends of the connecting pipe after the pipeline and the connecting pipe are fixed, so as to protect the internal airbag, prevent the two ends of the airbag from being directly exposed to the air and being damaged, causing leakage and affecting the strength of the connection, and further improve the connection strength between the connecting pipe and the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the structure of a valve pipe connector provided by an embodiment of the present invention;

[0025] Figure 2 It is a partial structural cross-sectional view of a valve pipe connector provided by an embodiment of the present invention;

[0026] Figure 3 A valve pipe connector provided by an embodiment of the present invention Figure 2 A magnified view of the structure of the middle A area;

[0027] Figure 4 It is a half-section view of the overall structure of a valve pipe connector provided by an embodiment of the present invention;

[0028] Figure 5 A valve pipe connector provided by an embodiment of the present invention Figure 4 A magnified view of the structure of the middle B region;

[0029] Figure 6 A valve pipe connector provided by an embodiment of the present invention Figure 4 A magnified view of the structure of the middle C region;

[0030] Figure 7 It is a half-section diagram of the structure of a valve pipe connector provided by an embodiment of the present invention from another perspective;

[0031] Figure 8 A valve pipe connector provided by an embodiment of the present invention Figure 7 A magnified view of the structure in region D.

[0032] In the figure: 1. connecting pipe; 11. positioning groove; 12. fixing groove; 13. airway; 14. through hole; 15. mounting groove; 16. first spring; 17. positioning sleeve; 18. slide groove; 2. air sleeve; 21. air nozzle; 3. air bag; 31. positioning block; 32. anti-slip sheet; 33. sealing block; 34. air pipe; 4. pipeline; 41. ring groove; 42. flange ring; 5. sealing assembly; 51. ring pipe; 52. fixing pipe; 53. limiting ring; 54. piston rod; 55. fan block; 56. connecting pipe; 57. second spring. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example, see Figure 1-Figure 8 A valve pipe connector comprises a connecting pipe 1 and an air sleeve 2 and an air bag 3 arranged on the connecting pipe 1, symmetrical positioning grooves 11 are provided on the inner walls at both ends of the connecting pipe 1, a fixing groove 12 is provided on the inner wall of the connecting pipe 1 near the positioning groove 11, a plurality of air passages 13 are provided on the side wall of the connecting pipe 1, a through hole 14 communicating at both ends is provided at one end of the air passage 13, a mounting groove 15 is provided on the inner wall of the through hole 14, a first spring 16 and a positioning sleeve 17 are installed at one end of the mounting groove 15, pipes 4 are installed on the inner walls at both ends of the connecting pipe 1, a flange ring 42 is installed at one end of the pipe 4, and annular grooves 41 are provided on the side walls at both ends of the pipe 4;

[0035] The gas sleeve 2 is installed on the outer wall of the connecting pipe 1, the interior of the gas sleeve 2 is connected with the air passage 13, and the side wall of the gas sleeve 2 is installed with a gas nozzle 21;

[0036] The airbag 3 is installed on the inner wall of the fixing groove 12 , a gas pipe 34 communicating with the inside of the air sleeve 2 is installed on one side wall of the airbag 3 , a plurality of positioning blocks 31 are installed on both end side walls of the airbag 3 , and a plurality of sealing blocks 33 are installed on one end of the airbag 3 .

[0037] Furthermore, the side walls at both ends of the first spring 16 are fixedly connected to the inner walls of the mounting groove 15 and one end of the positioning sleeve 17, respectively, the outer wall of the positioning sleeve 17 is slidably connected to the inner wall of the mounting groove 15, one of the pipes 4 and the valve are integrated, the positioning hole on the flange ring 42 and the mounting groove 15 are located on the same axis, the inner wall of the flange ring 42 and the outer wall of the positioning sleeve 17 are plugged into, the inner wall of the air sleeve 2 and the outer wall of the connecting pipe 1 are fixedly connected, the air nozzle 21 is opened during inflation and deflation, and one end of the sealing block 33 abuts against the side wall of the pipe 4 when the airbag 3 is inflated, the outer side wall of the airbag 3 is fixedly connected to the inner wall of the fixed groove 12, one end of a plurality of positioning blocks 31 abuts against the inner wall of the annular groove 41, and the side wall of the airbag 3 is provided with a plurality of anti-slip sheets 32 abutting against the outer wall of the pipe 4.

[0038] It should be noted that: when connecting the valve and the external pipeline 4, the two ends of the valve and the pipeline 4 are respectively inserted into the two ends of the connecting pipe 1, and the flange ring 42 at one end of the pipeline 4 is pressed against one end of the positioning groove 11, and the hole on the flange ring 42 is aligned with the slide groove 18, and the air nozzle 21 on the side wall of the air sleeve 2 is connected to the external air source, and the interior of the air sleeve 2 is inflated. During the inflation process, the air bag 3 is inflated through the air pipe 34 to gradually expand, so that the anti-slip sheet 32 ​​on the outside of the air bag 3 and the outer wall of the pipeline 4 are tightly pressed together, thereby increasing the friction between the air bag 3 and the pipeline 4, strengthening the connection between the air bag 3 and the pipeline 4, and avoiding the pipeline 4 from loosening after fixation. At the same time, after the air bag 3 is fully inflated, the side walls of the air bag 3 at both ends are The multiple positioning blocks 31 extend into the annular grooves 41 provided on the side walls at both ends of the pipeline 4, so as to realize the clamping connection between the positioning blocks 31 and the annular grooves 41, and limit the vertical direction of the pipeline 4, so as to prevent the pipeline 4 from loosening in the connecting pipe 1 after installation, thereby improving the strength of the connection. At the same time, during the inflation process, the gas in the air sleeve 2 enters the through hole 14 through the air channel 13 and flows to the positioning sleeves 17 on both sides, so that the air pressure inside the positioning sleeve 17 is increased, forcing the positioning sleeve 17 to stretch the first spring 16 to slide, so that the positioning sleeve 17 enters the hole in the flange ring 42, and further fixes the position of the pipeline 4, so as to prevent the pipeline 4 from rotating in the connecting pipe 1 and affecting the strength of the connection. At the same time, the pipeline 4 can be quickly connected through the connecting piece by inflation and deflation, thereby improving the speed of disassembly and assembly.

[0039] Further, the inner side walls at both ends of the connecting pipe 1 are provided with a plurality of axially symmetrical slide grooves 18, and the side walls at both ends of the connecting pipe 1 are provided with sealing components 5, the sealing components 5 are composed of an annular tube 51, a fixed tube 52, a limit ring 53, a piston rod 54, a fan block 55, a connecting tube 56 and a second spring 57, the outer wall of the fan block 55 and the inner wall of the slide groove 18 are slidably connected, and the plurality of fan blocks 55 and the sealing block 33 cooperate to seal the two ends of the connecting pipe 1, and one end of the fan block 55 and one end of the piston rod 54 are fixed The interior of the annular tube 51 is fixedly connected with a plurality of connecting tubes 56, one end of the connecting tube 56 is fixedly connected with the inner wall of the gas sleeve 2, a plurality of fixed tubes 52 are fixedly connected with the inner wall of the annular tube 51, the other end of the fixed tube 52 is fixedly connected with the inner wall of the slide groove 18, the inner wall of the fixed tube 52 is fixedly connected with the outer wall of the limit ring 53, the two ends of the second spring 57 are fixedly connected with the limit ring 53 and one end of the piston rod 54 respectively, and the outer wall of the piston rod 54 is piston-connected with the inner wall of the fixed tube 52.

[0040] It should be noted that: while the air sleeve 2 is being inflated, the multiple sealing blocks 33 at one end of the airbag 3 move outward from the fixed groove 12 until they abut against the inner wall of the connecting pipe 1 close to the fixed groove 12, and the other end of the airbag 3 abuts against the outer wall of the pipe 4. At the same time, the gas in the air sleeve 2 enters the annular tube 51 through the multiple connecting tubes 56. The gas entering the annular tube 51 squeezes the piston rod 54 on the inner wall of the fixed tube 52, causing it to stretch the second spring 57 to move toward one end of the slide groove 18. The second spring 57 is set to the outer wall of the pipe 4 in the subsequent exhaust. When the pipe 4 is disassembled, the position of the fan block 55 can be quickly reset. During the movement of the piston rod 54, the fan block 55 with one end located in the slide groove 18 moves outward until one end of the fan block 55 rests against the outer wall of the pipe 4. At this time, multiple fan blocks 55 and the sealing blocks 33 are spaced apart to seal the openings at both ends of the connecting pipe 1, thereby protecting the internal airbag 3, preventing the two ends of the airbag 3 from being directly exposed to the air and being damaged, causing leakage and affecting the strength of the connection, and further improving the connection strength between the connecting pipe 1 and the pipe 4.

[0041] The working principle of this valve pipe connector:

[0042] When connecting the valve and the external pipeline 4, the two ends of the valve and the pipeline 4 are respectively inserted into the two ends of the connecting pipe 1, and one end of the flange ring 42 at one end of the pipeline 4 is pressed against the positioning groove 11, and the hole on the flange ring 42 is aligned with the slide groove 18, the air nozzle 21 on the side wall of the air sleeve 2 is connected to the external air source, and the interior of the air sleeve 2 is inflated. During the inflation process, the air bag 3 is inflated through the air delivery pipe 34 to gradually expand, so that the anti-slip sheet 32 ​​on the outside of the air bag 3 and the outer wall of the pipeline 4 are tightly pressed together. During the inflation process, the gas in the air sleeve 2 enters the through hole 14 through the air channel 13 and flows to the positioning sleeves 17 on both sides, so that the air pressure inside the positioning sleeve 17 is increased, forcing the positioning sleeve 17 to stretch the first spring 16 to slide, so that the positioning sleeve 17 enters the hole in the flange ring 42, and the position of the pipeline 4 is further fixed, so as to prevent the pipeline 4 from rotating in the connecting pipe 1 and affecting the strength of the connection. At the same time, during the inflation process, the air bag 3 is multi-functional at one end thereof. The sealing block 33 moves outward from the fixed groove 12 until it abuts against the inner wall of the connecting pipe 1 close to the fixed groove 12, and at the same time, its other end abuts against the outer wall of the pipeline 4. At the same time, the gas in the air sleeve 2 enters the annular tube 51 through multiple connecting tubes 56. The gas entering the annular tube 51 squeezes the piston rod 54 on the inner wall of the fixed tube 52, causing it to stretch the second spring 57 to move toward one end of the slide groove 18. The second spring 57 is set to quickly reset the position of the fan block 55 when the pipeline 4 is disassembled by subsequent exhaust. During the movement of the piston rod 54, the fan block 55 with one end located in the slide groove 18 moves outward until one end of the fan block 55 abuts against the outer wall of the pipeline 4. At this time, the multiple fan blocks 55 and the sealing block 33 are spaced apart to seal the openings at both ends of the connecting pipe 1, thereby protecting the internal airbag 3 to prevent the two ends of the airbag 3 from being directly exposed to the air and being damaged, causing leakage to affect the strength of the connection, and further improving the connection strength between the connecting pipe 1 and the pipeline 4.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A valve-pipe connector, comprising a connecting pipe (1) and an air sleeve (2) and an air bag (3) arranged on the connecting pipe (1), characterized in that: Symmetrical positioning grooves (11) are provided on the inner walls at both ends of the connecting pipe (1), a fixing groove (12) is provided on the inner wall of the connecting pipe (1) close to the positioning groove (11), a plurality of air passages (13) are provided on the side wall of the connecting pipe (1), a through hole (14) communicating at both ends is provided at one end of the air passage (13), a mounting groove (15) is provided on the inner wall of the through hole (14), a first spring (16) and a positioning sleeve (17) are installed at one end of the mounting groove (15), pipes (4) are installed on the inner walls at both ends of the connecting pipe (1), a flange ring (42) is installed at one end of the pipe (4), and annular grooves (41) are provided on the side walls at both ends of the pipe (4); The gas sleeve (2) is installed on the outer wall of the connecting pipe (1), the interior of the gas sleeve (2) is connected to the air passage (13), and a gas nozzle (21) is installed on the side wall of the gas sleeve (2); The airbag (3) is mounted on the inner wall of the fixing groove (12); a gas delivery pipe (34) communicating with the interior of the air sleeve (2) is mounted on one side wall of the airbag (3); a plurality of positioning blocks (31) are mounted on the side walls at both ends of the airbag (3); and a plurality of sealing blocks (33) are mounted on one end of the airbag (3).

2. A valve pipe connector according to claim 1, characterized in that: The side walls at both ends of the first spring (16) are respectively fixedly connected to the mounting groove (15) and the inner wall of one end of the positioning sleeve (17), and the outer wall of the positioning sleeve (17) is slidably connected to the inner wall of the mounting groove (15).

3. A valve pipe connector according to claim 2, characterized in that: One of the pipes (4) and the valve is integrated, the positioning hole and the mounting groove (15) on the flange ring (42) are located on the same axis, and the inner wall of the flange ring (42) and the outer wall of the positioning sleeve (17) are plugged into each other.

4. A valve pipe connector according to claim 3, characterized in that: The inner wall of the air sleeve (2) is fixedly connected to the outer wall of the connecting pipe (1); the air nozzle (21) is opened during inflation and deflation; and one end of the sealing block (33) abuts against the side wall of the pipe (4) when the air bag (3) is inflated.

5. A valve pipe connector according to claim 4, characterized in that: The airbag (3) has a curved outer wall fixedly connected to the inner wall of the fixed groove (12), one end of a plurality of positioning blocks (31) abuts against the inner wall of the annular groove (41), and the side wall of the airbag (3) is provided with a plurality of anti-slip sheets (32) abutting against the outer wall of the pipe (4).

6. A valve pipe connector according to claim 1, characterized in that: The inner side walls at both ends of the connecting pipe (1) are provided with a plurality of axisymmetric sliding grooves (18), and the side walls at both ends of the connecting pipe (1) are provided with sealing assemblies (5), and the sealing assemblies (5) are composed of an annular tube (51), a fixed tube (52), a limiting ring (53), a piston rod (54), a fan block (55), a connecting tube (56) and a second spring (57).

7. A valve pipe connector according to claim 6, characterized in that: The outer wall of the fan block (55) and the inner wall of the slide groove (18) are slidably connected, and the plurality of fan blocks (55) and the sealing block (33) cooperate to seal the two ends of the connecting pipe (1), and one end of the fan block (55) and one end of the piston rod (54) are fixedly connected.

8. A valve pipe connector according to claim 7, characterized in that: The interior of the annular tube (51) is connected and fixed to a plurality of connecting tubes (56), one end of the connecting tube (56) is connected and fixed to the inner wall of the air sleeve (2), a plurality of fixed tubes (52) are connected and fixed to the inner wall of the annular tube (51), and the other end of the fixed tube (52) is connected and fixed to the inner wall of the slide groove (18).

9. A valve pipe connector according to claim 8, characterized in that: The inner wall of the fixed tube (52) is fixedly connected to the outer wall of the limiting ring (53), the two ends of the second spring (57) are respectively fixedly connected to the limiting ring (53) and one end of the piston rod (54), and the outer wall of the piston rod (54) is piston-connected to the inner wall of the fixed tube (52).

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