Connecting joint for nitrogen purging of metal pipe

Abstract

The invention relates to the technical field of connecting structures, in particular to a metal pipe nitrogen purging connector which comprises an outer pipe, a clamping structure used for fixing a metal pipe is arranged at one end of the outer pipe, and the other end of the outer pipe is used for being connected with a gas source; a piston is arranged in the outer pipe in a sliding mode, and an air hole for air circulation is formed in the middle of the piston. Therefore, the air pressure can generate a direct and effective pushing effect on the piston, so that the piston moves in the outer pipe in a small range, the piston is more tightly attached to the end of the metal pipe, the sealing performance of connection between the connector and the metal pipe is improved, the connection mode is simple and rapid, a rapid assembly working mode can be achieved, and the service life of the connector is prolonged. And meanwhile, due to the fact that the air holes are directly in butt joint with the metal pipes, the diameters of the metal pipes are not limited, and rapid connection and nitrogen purging work can be conveniently achieved on the metal pipes of different models and specifications.

Description

Technical Field

[0001] The invention relates to the technical field of connection structures, in particular to a connection joint for nitrogen purging of a metal tube. Background Art

[0002] In the manufacturing and processing of metal pipes, nitrogen purging technology is widely used to remove impurities, oxides and residual gases in the pipeline to ensure the cleanliness and performance of the pipeline. Especially in the welding, heat treatment or surface treatment of metal pipes such as stainless steel, copper, and aluminum, nitrogen purging can effectively prevent oxidation and improve product quality.

[0003] In actual operation, achieving efficient nitrogen purging not only depends on the quality and pressure of nitrogen, but also requires suitable equipment and accessories to ensure the smooth progress of the entire process. Among them, the connection joint is one of the key components in the nitrogen purging system, and the rationality of its design directly affects the purging efficiency and the safety of operation.

[0004] When using traditional connecting joints, different types of connecting joints need to be used according to the outer diameter or inner diameter of different metal pipes. Therefore, the applicability of the traditional connecting joints is poor. When the joints are connected to the metal pipes, it is necessary to set a single-sided tapered or double-sided tapered sealing ring on the outer wall of the metal pipe, and then use the threaded tightening method to squeeze the tapered surface of the sealing ring along the axial direction of the metal pipe to achieve a sealed connection between the joint and the metal pipe. Since the nitrogen purge has a high pressure, leakage often occurs, resulting in a loss of nitrogen resources. In addition, the operation method is cumbersome and is not suitable for continuous disassembly and assembly and nitrogen purge of multiple metal pipes. Summary of the invention

[0005] The present invention provides a metal tube nitrogen purging connection joint, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A metal tube nitrogen purging connection joint comprises an outer tube, one end of the outer tube is provided with a clamping structure for fixing the metal tube, and the other end of the outer tube is used to connect with a gas source; A piston is slidably arranged inside the outer tube, a gas hole is provided in the middle of the piston for gas circulation, and a plurality of sealing rings for sealing are arranged on the circumferential outer wall of the piston. At least in a part of the stroke of the piston movement, the piston abuts against the end of the metal tube.

[0007] In some embodiments of the present invention, a cone is provided on the side wall of the piston along the gas flow direction in the outer tube.

[0008] In some embodiments of the present invention, a sealing sleeve having the same shape as the cone is provided on the outer wall of the cone.

[0009] In some embodiments of the present invention, a cavity consistent with the shape of the sealing sleeve is defined inside the sealing sleeve.

[0010] In some embodiments of the present invention, a spring is arranged inside the outer tube, and the spring is sleeved on the outside of the cone cylinder, one end of the spring contacts the side wall of the piston, and the other end of the spring is installed on the inner wall of the outer tube through a connecting ring and a retaining ring.

[0011] In some embodiments of the present invention, the spring is in surface contact with the side wall of the piston.

[0012] In some embodiments of the present invention, the outer tube includes a thick tube and a thin tube, the thick tube and the thin tube are integrally formed, the piston is located inside the thick tube, the clamping structure is installed on the thick tube, and the spring provides elastic thrust for the piston and makes the side wall of the piston fit on the stepped position between the thick tube and the thin tube.

[0013] In some embodiments of the present invention, the clamping structure includes a base ring and a plurality of movable arms slidably mounted on the base ring, a pressure plate for squeezing the metal tube is provided at the end of the movable arm, a power ring is rotatably arranged on the base ring, helical teeth are provided on the side wall of the power ring and the side wall of each movable arm, and the power ring is connected to each movable arm by helical gear meshing.

[0014] In some embodiments of the present invention, the linear direction of the movable arm is a direction inclined toward the direction of the capillary or a direction perpendicular to the axis of the base ring.

[0015] In some embodiments of the present invention, the straight line direction of the movable arm is perpendicular to the axis of the base ring, the pressure plate and the movable arm slide relative to each other, and the sliding direction of the pressure plate on the movable arm is inclined along the flow direction of the airflow in the outer tube, and the pressure plate and the movable arm are connected by a spring.

[0016] The technical solution of the present invention can achieve the following technical effects: By utilizing nitrogen gas pressure to generate a lateral thrust on the piston, the piston is closely fitted to the end of the metal tube, thereby effectively improving the sealing effect, and conveniently realizing the function that the stronger the gas pressure, the better the sealing effect. In addition, the sealing method is simple, and the disassembly and assembly are convenient and quick. It can be applied to the quick connection and nitrogen purging of different metal tubes. At the same time, since nitrogen purging can be achieved by simply connecting the air hole to the metal tube, the joint can be applied to metal tubes of different calibers or models, and its applicability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a schematic diagram of the inner structure of the outer tube in an embodiment of the present invention; Figure 3 is a schematic diagram of a sectional structure of a piston in an embodiment of the present invention; Figure 4 is a structural schematic diagram of a clamping structure in an embodiment of the present invention; Figure 5 yes Figure 4 A schematic diagram of the structure from another perspective; Figure 6 Schematic diagram of the structure of the movable arm in the embodiment of the present invention.

[0019] Reference numerals: 100, outer tube; 101, piston; 102, air hole; 103, sealing ring; 104, cone; 105, sealing sleeve; 106, pressure ring; 107, cavity; 108, spring; 109, connecting ring; 110, retaining ring; 111, thick tube; 112, thin tube; 200, clamping structure; 201, base ring; 202, movable arm; 203, pressure plate; 204, power ring; 205, handle; 206, spring piece. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figures 1 to 3 As shown, a metal tube nitrogen purging connection joint of the present invention comprises an outer tube 100, one end of the outer tube 100 is provided with a clamping structure 200 for fixing the metal tube, and the other end of the outer tube 100 is used to connect with a gas source; A piston 101 is slidably disposed inside the outer tube 100, a gas hole 102 for gas circulation is provided in the middle of the piston 101, and a plurality of sealing rings 103 for sealing are provided on the circumferential outer wall of the piston 101. At least in part of the movement of the piston 101, the piston 101 abuts against the end of the metal tube.

[0023] In the present invention, the clamping structure 200 provided at one end of the outer tube 100 can squeeze and fix the metal tube inserted into the outer tube 100, and the other end of the outer tube 100 needs to be connected to the gas source, so that the nitrogen provided by the gas source can be transported into the metal tube through the outer tube 100. The connection between the outer tube 100 and the gas source can be achieved by tightening the threaded pipe as the output end of the gas source and the thread provided on the inner wall of the outer tube 100, thereby realizing the connection work, or adding a flange, a sealing ring and other structures connected to the gas pipe at the end of the outer tube 100. Since the outer tube 100 and the gas source do not need to be frequently disassembled and assembled, only a conventional connection method is required; of course, in some embodiments, a quick-install form or structure can also be used to achieve the connection; the piston 101 in the outer tube 100 is allowed to move in the outer tube 100 along the axial direction of the outer tube 100, and the plurality of sealing rings 103 on the outer wall of the piston 101 are mainly used to improve the sealing effect between the piston 101 and the inner wall of the outer tube 100, so as to facilitate the sealed movement of the piston 101; When in use, the end of the metal tube passes through the clamping structure 200 and is inserted into the outer tube 100, the side wall of the piston 101 abuts against the end of the metal tube, and the air hole 102 is connected to the metal tube. The clamping structure 200 clamps and fixes the metal tube. When nitrogen purging is required, the gas source releases nitrogen and introduces nitrogen into the outer tube 100. The air pressure in the outer tube 100 increases, and the nitrogen inside is introduced into the metal tube through the air hole 102. Since there is a high air pressure in the outer tube 100, the contact area between the side wall of the piston 101 and the nitrogen is large, so the air pressure can be increased. The piston 101 is directly and effectively pushed, so that the piston 101 moves in a small range in the outer tube 100 and the piston 101 fits more closely with the end of the metal tube, thereby improving the sealing of the connection between the joint and the metal tube. In addition, this connection method is simple and fast, and can realize a quick installation working mode, so it can be suitable for the rapid purging of multiple metal tubes. At the same time, since the air hole 102 is directly connected to the metal tube, there is no restriction on the diameter of the metal tube, which is convenient for the rapid connection and nitrogen purging of metal tubes of different models and specifications. In some embodiments, in order to enhance the fitting effect between the piston 101 and the metal tube, auxiliary structures may be added, such as sealing gaskets, elastic structures that provide elastic thrust to the piston 101, etc.; and as for the caliber of the air hole 102, since air pressure is required to generate thrust on the piston 101, the diameter of the air hole 102 is at most half of the diameter of the piston 101.

[0024] Optimized to the above implementation, such as Figure 3 As shown, a cone 104 is provided on the side wall of the piston 101 along the gas flow direction in the outer tube 100 .

[0025] One side of the piston 101 faces the gas flow direction in the outer tube 100, and this side of the piston 101 is mainly used for gas pushing. A cone 104 is arranged at the other end of the piston 101, and the cone 104 is connected with the air hole 102. When it is necessary to connect with the metal tube, the end of the metal tube is sleeved on the conical surface of the cone 104, so that part of the cone 104 will be located on the inner side of the metal tube, and the remaining part of the cone 104 will be located on the outer side of the metal tube, thereby realizing the connection between the piston 101 and the metal tube. This method can prevent the metal tube and the piston 101 from sliding relative to each other and causing displacement deviation, and at the same time ensure that the air hole 102 can be connected with the metal tube, avoiding gas leakage caused by the misalignment of the air hole 102 and the metal tube. At the same time, when the gas pressure generates a driving force on the piston 101, the force exerted on the cone 104 will produce a tendency of expanding the end of the metal tube, thereby further improving the sealing of the joint and the metal tube; it should be pointed out that the cone 104 can also be applied to metal tubes of different diameters; In some embodiments, if the metal tube is a polygon or other special shape, the shape of the cone 104 also needs to be adjusted to correspond to the shape of the metal tube; the piston 101 and the cone 104 can be made in an integral molding manner or by welding.

[0026] Optimized to the above implementation, such as Figure 3 As shown, a sealing sleeve 105 having the same shape as the cone cylinder 104 is provided on the outer wall of the cone cylinder 104 .

[0027] In the present invention, the shape of the sealing sleeve 105 is consistent with that of the cone 104, and both are conical, so that the end of the metal tube is abutted against the outer wall of the sealing sleeve 105, so that it can achieve abutment and communication with the cone 104 or the piston 101. The setting of the sealing sleeve 105 can enhance the sealing effect of the joint and the metal tube; Since the sealing sleeve 105 is also conical, it can be directly sleeved on the cone cylinder 104 during installation, and a pressure ring 106 can be added to the end of the cone cylinder 104 to block the sealing sleeve 105 so that the sealing sleeve 105 is firmly installed on the cone cylinder 104; in order to improve the contact sealing between the sealing sleeve 105 and the end of the metal tube, a plurality of stepped structures can be provided on the outer wall of the sealing sleeve 105, and the end of the metal tube is directly sleeved on the steps, so that the sealing sleeve 105 can have a better contact sealing effect on the end face and inner wall of the metal tube.

[0028] Optimized to the above implementation, such as Figure 3As shown, a cavity 107 which is consistent with the appearance of the sealing sleeve 105 is defined inside the sealing sleeve 105 .

[0029] The cavity 107 can be filled with gas or fluid. When the end of the metal tube contacts a part of the outer wall of the sealing sleeve 105, the end face of the metal tube pushes the area of ​​the sealing sleeve 105 to be recessed into the cavity 107, and the sealing sleeve 105 is partially deformed. The space of the part of the cavity 107 corresponding to the recessed position of the sealing sleeve 105 becomes smaller, thereby squeezing the air or fluid to the left and right sides of the cavity 107. The left and right sides of the contact position of the sealing sleeve 105 and the metal tube will be deformed to bulge outwards, thereby facilitating the outer wall of the deformed part of the sealing sleeve 105 to contact the end face or inner wall of the metal tube, thereby improving the sealing performance of the metal tube; It should be pointed out that, since the outer wall of the sealing sleeve 105 only needs to contact the metal tube, the outer wall of the sealing sleeve 105 can be set to a smooth surface, so that when the end of the metal tube contacts the outer wall of the sealing sleeve 105 at any position, it can enhance the sealing effect on the metal tube. Even if the metal tube and the sealing sleeve 105 cannot be coaxial, and the assembly accuracy of the sealing sleeve 105 and the metal tube is low, this effect can also be achieved. Of course, in this case, the distance between the metal tube and the sealing sleeve 105 deviating from each other should not be too large, otherwise the connection effect cannot be achieved. During the actual processing of the sealing sleeve 105, a rubber layer can be formed on the surface of a long plate-shaped core material. When the long plate is pulled out, a flat long tube structure will be left. The two ends of the long tube are then melted and connected to form the shape of the sealing sleeve 105 used in this case.

[0030] Optimized to the above implementation, such as Figure 2 As shown, a spring 108 is arranged in the outer tube 100, and the spring 108 is sleeved on the outside of the cone 104, one end of the spring 108 contacts the side wall of the piston 101, and the other end of the spring 108 is installed on the inner wall of the outer tube 100 through a connecting ring 109 and a retaining ring 110.

[0031] In the present invention, one end of the spring 108 is connected to the side wall of the piston 101, and the other end of the spring 108 is connected to the connecting ring 109. The specific connection method can be any method such as welding, abutment, riveting, etc. The retaining spring 110 achieves a clamping and fixing effect on the connecting ring 109, thereby allowing the spring 108, the connecting ring 109 and the retaining spring 110 to be installed on the outer tube 100; when connecting the metal tube, the end of the metal tube can abut on the sealing sleeve 105, and the metal tube can be inserted more into the outer tube 100, so that the metal tube will generate a thrust on the piston 101, thereby causing the spring 108 to undergo elastic deformation, and the spring 108 generates a moving pulling force on the piston 101, so that there is a certain extrusion pressure between the piston 101 and the metal tube, which is convenient for preventing gas leakage in the initial state of gas supply.

[0032] Optimized in the above implementation, the spring 108 is in surface contact with the side wall of the piston 101 .

[0033] Since the spring 108 provides an elastic force for the piston 101, when the spring 108 and the piston 101 are in point contact, the force of the spring 108 on the piston 101 will cause the piston 101 to be subjected to uneven force, and part of the sealing ring 103 on one side of the piston 101 will be severely deformed, while part of the sealing ring 103 on the other side of the piston 101 will be less deformed, which will cause gas leakage, and the friction between the piston 101 and the inner wall of the outer tube 100 will increase, making it difficult for the piston 101 to move. By making the spring 108 and the piston 101 in a surface contact state, the above problems can be effectively avoided. It should be pointed out that the surface contact state can be achieved by adding a gasket or other supporting structure to the end of the spring 108, or by grinding the end of the spring 108 flat, or by tightening the ends of the spring 108 to form a flat supporting surface. As long as the effect of this case can be achieved, it is within the protection scope of this case.

[0034] Optimized to the above implementation, such as Figure 1 As shown, the outer tube 100 includes a thick tube 111 and a thin tube 112, the thick tube 111 and the thin tube 112 are integrally formed, the piston 101 is located in the thick tube 111, the clamping structure 200 is installed on the thick tube 111, and the spring 108 provides elastic thrust for the piston 101 and makes the side wall of the piston 101 fit on the stepped position between the thick tube 111 and the thin tube 112.

[0035] In the present invention, one end of the thin tube 112 is butted with the thick tube 111, and the other end of the thin tube 112 can be provided with a flange, an internal thread or other structures to achieve connection with the gas source. The clamping structure 200 can be installed on the thick tube 111 by bolts or clamping. The piston 101 and the structure thereon are installed in the thick tube 111, and a groove for installing the retaining spring 110 is provided on the inner wall of the thick tube 111. This structural form can facilitate the assembly of the joint and facilitate the processing of the joint; the stepped position between the thick tube 111 and the thin tube 112 can be used to block and position the piston 101, thereby preventing the piston 101 from moving randomly in the outer tube 100, and the spring 108 can provide a pre-tightening thrust for the piston 101; It should be noted that the thick tube 111 and the thin tube 112 can be integrally formed or processed by welding.

[0036] Optimized to the above implementation, such as Figures 4 to 5As shown, the clamping structure 200 includes a base ring 201 and a plurality of movable arms 202 slidably mounted on the base ring 201, a pressure plate 203 for extruding the metal tube is provided at the end of the movable arm 202, a power ring 204 is rotatably provided on the base ring 201, and helical teeth are provided on the side walls of the power ring 204 and the side walls of each movable arm 202, and the power ring 204 is connected to each movable arm 202 by helical gear meshing.

[0037] In the present invention, the base ring 201 can be installed on the thick tube 111 by means of bolts. The base ring 201 is coaxial with the thick tube 111. When the metal tube is connected, the metal tube passes through the base ring 201 and extends into the thick tube 111. By rotating the power ring 204, the helical teeth are used to make the multiple movable arms 202 approach each other synchronously. The multiple movable arms 202 push the multiple pressure plates 203 to move synchronously and squeeze and hold the metal tube, thereby achieving the fixing of the metal tube; the positions of the multiple movable arms 202 on the base ring 201 are relatively distributed, that is, the multiple pressure plates 203 allow The power ring 204 can be in contact with the metal pipe at the same time to realize the centering work of the metal pipe; the setting of the power ring 204 can realize the synchronous movement of multiple movable arms 202, and the operator only needs to control the power ring 204 to realize the control work of multiple movable arms 202 and multiple pressure plates 203, which is simpler to operate; the working surface of the pressure plate 203 can be an arc surface matched with the outer wall of the metal pipe, or a rubber pad can be set on the working surface of the pressure plate 203 to realize the surface contact effect between the pressure plate 203 and the metal pipe, and it is convenient to improve the friction force, and metal pipes with different radii can be used; In some embodiments, a handle 205 can be provided on the power ring 204 to facilitate operation. The handle 205 can also be used as a top screw structure and threadedly connected to the power ring 204. When the power ring 204 needs to be rotated, the worker only needs to push the handle 205 to move. When the metal pipe is clamped, it is only necessary to screw the handle 205 so that the handle 205 abuts against the outer wall of the base ring 201, thereby locking the position of the power ring 204.

[0038] Optimized in the above implementation, the linear direction of the movable arm 202 is a direction inclined toward the capillary 112 or a direction perpendicular to the axis of the base ring 201 .

[0039] In the present invention, the moving direction of the movable arm 202 is the direction of the straight line in which it is located. The movable arm 202 can be allowed to tilt or move along the radial direction of the base ring 201, so that the pressure plate 203 can be close to the axis of the base ring 201 or away from the axis of the base ring 201. For the tilting movement of the movable arm 202, it needs to be tilted in the direction of the capillary 112, so that the movable arm 202 and the nitrogen flow direction will have a conflicting effect, thereby improving the clamping effect; Figure 5For example, the movable arm 202 is along the radial direction of the base ring 201. This arrangement allows the multiple pressure plates 203 to move vertically toward the axial direction of the base ring 201. The helical teeth on the movable arm 202 and the power ring 204 can coincide with the vertical plane, making the helical tooth processing simpler and more convenient.

[0040] Optimized to the above implementation, such as Figure 5 to Figure 6 As shown, the straight line direction of the movable arm 202 is perpendicular to the axis of the base ring 201, the pressure plate 203 slides relative to the movable arm 202, and the sliding direction of the pressure plate 203 on the movable arm 202 is inclined along the flow direction of the airflow in the outer tube 100, and the pressure plate 203 and the movable arm 202 are connected by a spring 206.

[0041] In the present invention, the spring sheet 206 is mainly used to provide elastic thrust for the pressure plate 203. When the movable arm 202 moves toward the metal tube, the movable arm 202 will push the pressure plate 203 to move synchronously through the spring sheet 206, and the pressure plate 203 can clamp and fix the metal tube. Since the pressure plate 203 tilts and slides on the movable arm 202, the force of the movable arm 202 on the pressure plate 203 will cause the pressure plate 203 to move toward the direction of the capillary 112 on the metal tube, thereby improving the tightness of the connection between the metal tube and the piston 101, and when the piston 101 generates a force on the metal tube along the airflow direction due to the influence of air pressure, due to the friction between the pressure plate 203 and the metal tube, the squeezing force of the pressure plate 203 on the metal tube can be made stronger, thereby reversely utilizing air pressure to achieve a more effective clamping effect of the clamping structure 200 on the metal tube.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A metal tube nitrogen purging connection joint, characterized in that: It comprises an outer tube, one end of which is provided with a clamping structure for fixing the metal tube, and the other end of which is used to be connected to a gas source; A piston is slidably arranged inside the outer tube, a gas hole is provided in the middle of the piston for gas circulation, and a plurality of sealing rings for sealing are arranged on the circumferential outer wall of the piston. At least in a part of the stroke of the piston movement, the piston abuts against the end of the metal tube.

2. A metal tube nitrogen purging connection joint according to claim 1, characterized in that: A cone is provided on the side wall of the piston along the gas flow direction in the outer tube.

3. A metal tube nitrogen purging connection joint according to claim 2, characterized in that: A sealing sleeve having the same shape as the cone cylinder is arranged on the outer wall of the cone cylinder.

4. A metal tube nitrogen purging connection joint according to claim 3, characterized in that: The sealing sleeve has a cavity inside which is consistent with the shape of the sealing sleeve.

5. A metal tube nitrogen purging connection joint according to claim 4, characterized in that: A spring is arranged in the outer tube and sleeved on the outer side of the cone cylinder. One end of the spring contacts the side wall of the piston, and the other end of the spring is installed on the inner wall of the outer tube through a connecting ring and a retaining ring.

6. A metal tube nitrogen purging connection joint according to claim 5, characterized in that: The spring is in surface contact with the side wall of the piston.

7. A metal tube nitrogen purging connection joint according to claim 6, characterized in that: The outer tube includes a thick tube and a thin tube, the thick tube and the thin tube are integrally formed, the piston is located in the thick tube, the clamping structure is installed on the thick tube, and the spring provides elastic thrust for the piston and makes the side wall of the piston fit on the stepped position between the thick tube and the thin tube.

8. The metal tube nitrogen purging connection joint according to claim 1, characterized in that: The clamping structure includes a base ring and a plurality of movable arms slidably mounted on the base ring, a pressure plate for squeezing the metal tube is arranged at the end of the movable arm, a power ring is rotatably arranged on the base ring, helical teeth are arranged on the side wall of the power ring and the side wall of each movable arm, and the power ring is connected to each movable arm by helical gear meshing.

9. A metal tube nitrogen purging connection joint according to claim 8, characterized in that: The straight line direction of the movable arm is a direction inclined toward the direction of the capillary or a direction perpendicular to the axis of the base ring.

10. A metal tube nitrogen purging connection joint according to claim 8, characterized in that: The straight line direction of the movable arm is perpendicular to the base ring axis, the pressure plate slides relatively with the movable arm, and the sliding direction of the pressure plate on the movable arm is inclined along the flow direction of the airflow in the outer tube, and the pressure plate and the movable arm are connected by a spring sheet.

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