Manufacturing method and manufacturing device of metal airtight hose

Abstract

The present application provides a method and device for manufacturing a metal airtight hose. The metal airtight hose comprises a metal hose and an airtight shell, the radial cross-sectional shape of the metal hose is non-circular, the minimum inner diameter of the metal hose is smaller than the maximum outer diameter of the airtight shell, and the diameter of a circle corresponding to the inner circumferential length of the metal hose as the circumference is larger than the maximum outer diameter of the airtight shell; the manufacturing method comprises: applying pressure to the tube wall of the metal hose to cause elastic deformation of the tube wall of the metal hose until the minimum inner diameter of the metal hose is larger than the maximum outer diameter of the airtight shell; sleeve the airtight shell on the inner side of the metal hose; releasing the pressure to cause the metal hose to rebound, after the metal hose rebounds, at least two contact lines are formed between the metal hose and the airtight shell in the full length direction of the axis, and an air sandwich is formed in the area other than the contact lines between the metal hose and the airtight shell, that is, the interference fit assembly between the metal hose and the airtight shell is completed.

Description

Technical Field

[0001] The present application relates to the field of metal airtight hoses, and in particular to a method and device for manufacturing a metal airtight hose. Background Art

[0002] Metal airtight hoses are usually required in the exhaust system of automobiles. However, during the driving process, due to the impact of road bumps, engines, turbochargers or auxiliary devices, the exhaust system of the automobile often vibrates, which can easily lead to hidden dangers such as metal airtight hose breakage or leakage. In addition, since the temperature of the metal airtight hose inside the car can reach hundreds of degrees Celsius when the engine is running, it may cause high temperature effects on vehicle parts around the metal airtight hose, such as oil pipes, wires, plastic parts, etc. Summary of the invention

[0003] In view of the shortcomings of the related art, the present application proposes a method for manufacturing a metal airtight hose and a device for manufacturing a metal airtight hose, so as to solve the problems in the related art that the metal airtight hose is easily broken due to the vibration of the internal system of the automobile, and the high temperature of the metal airtight hose leads to high ambient temperature.

[0004] The present application provides a method for manufacturing a metal airtight hose, the metal airtight hose comprising a metal hose and an airtight shell as described above, the radial cross-section of the metal hose being non-circular, the minimum inner diameter of the metal hose being smaller than the maximum outer diameter of the airtight shell, and the diameter of a circle corresponding to the inner circumferential length of the metal hose being larger than the maximum outer diameter of the airtight shell; the manufacturing method comprising:

[0005] Applying pressure to the tube wall of the metal hose to cause elastic deformation of the tube wall of the metal hose until the minimum inner diameter of the metal hose is larger than the maximum outer diameter of the airtight shell;

[0006] The airtight shell is arranged inside the metal hose;

[0007] The pressure is released to make the metal hose rebound. After the metal hose rebounds, at least two contact lines are formed between the metal hose and the airtight shell in the full length direction of the axis, and an air sandwich is formed between the metal hose and the airtight shell except for the contact lines, that is, the interference fit assembly between the metal hose and the airtight shell is completed;

[0008] Wherein, the method for manufacturing the airtight shell comprises:

[0009] The special-shaped metal strip is subjected to a spiral coil welding process so that the special-shaped metal strip forms a multi-turn corrugated structure arranged in sequence and connected to each other along the axial direction of the airtight shell; the shape of the corrugated structure is a U-shaped groove with an opening away from the central axis of the airtight shell, the U-shaped groove includes a groove body and two extensions respectively connected to the two ends of the opening end of the groove body, there is a gap between the groove bodies of two adjacent U-shaped grooves, and the extensions of the two adjacent U-shaped grooves are connected to each other; the groove body includes a first groove wall and a second groove wall that are arranged oppositely and connected to each other, the extension part includes a first extension part and a second extension part that are arranged oppositely, one end of the first groove wall extending along the opening end is connected to the first extension part, and one end of the second groove wall extending along the opening end is connected to the second extension part; the first extension part includes a first extension body and a first folding part that is bent and connected to the first extension body, the second extension part includes a second extension body and a second folding part that is bent and connected to the second extension body, and the spacing between the first extension body and the second extension body is greater than the spacing between the first groove wall and the second groove wall.

[0010] In some embodiments, the spiral coiling and welding process of the shaped metal strip includes: spirally rolling the shaped metal strip to spirally coil the shaped metal strip to form a multi-turn corrugated structure, and welding and fixing two adjacent corrugated structures.

[0011] In some embodiments, before the spiral coiling and welding of the shaped metal strip, the process further comprises:

[0012] The metal strip is subjected to pressure forming treatment to form a trough body and the first extension part and the second extension part respectively connected to the two ends of the opening end of the trough body, the first trough wall is connected to the first extension part at one end extending along the opening end, and the second trough wall is connected to the second extension part at one end extending along the opening end; the spacing between the first extension part and the second extension part is greater than the spacing between the first trough wall and the second trough wall; the first extension part is folded to form the first extension body and the first folded part, and the second extension part is folded to form the second extension body and the second folded part, so as to form the special-shaped metal strip.

[0013] In some embodiments, after welding and fixing the two adjacent corrugated structures, the method further includes:

[0014] The two ends of the multi-turn corrugated structure are subjected to relative compression processing to shorten the axial length of the partial corrugated structure at the two ends of the multi-turn corrugated structure.

[0015] In some embodiments, applying pressure to the wall of the metal hose to elastically deform the wall of the metal hose until the minimum inner diameter of the metal hose is greater than the maximum outer diameter of the airtight shell comprises:

[0016] A plurality of radially balanced forces are applied to at least one radial cross-sectional profile surface of the metal hose, so that the radial spacing distance between the two points with the largest spacing on the radial cross-sectional profile of the metal hose is reduced, and the radial spacing distance between the two points with the smallest spacing on the radial cross-sectional profile of the metal hose is increased, until the radial cross-sectional profile of the metal hose becomes circular.

[0017] In some embodiments, the radial cross-sectional profile of the metal hose may be in the shape of an ellipse, a triangle, a rectangle or other polygons.

[0018] In some embodiments, before the metal hose and the airtight shell are assembled by interference fit, the process further includes making the metal hose, which specifically includes:

[0019] The special-shaped metal belt is subjected to a spiral multi-layer winding and buckling process, so that the special-shaped metal belt forms a multi-turn interlocking structure which is sequentially arranged and interconnected along the axial direction of the metal hose.

[0020] In some embodiments, the spiral multi-layer winding and buckling process of the special-shaped metal belt includes:

[0021] The special-shaped metal strip is spirally coiled and fastened around a mandrel, wherein the radial cross-section of the mandrel is non-circular. During the coiling and fastening process:

[0022] Controlling the rotation speed of the mandrel to remain constant, and controlling the feeding speed of the shaped metal strip to change with the circumferential length of the shaped metal strip covering the circumference of the mandrel per unit time;

[0023] Alternatively, the feeding speed of the shaped metal strip is controlled to remain unchanged, and the rotation speed of the mandrel is controlled to change with the circumferential length of the shaped metal strip covering the circumferential surface of the mandrel per unit time.

[0024] In some embodiments, the multi-turn interlocking structure includes adjacent first and second interlocking structures and a transition portion located between the first and second interlocking structures, the first and second interlocking structures respectively include a first buckle portion and a second buckle portion that are buckled with each other, the second buckle portion of the first interlocking structure is connected to the first buckle portion of the second interlocking structure through the transition portion, the second buckle portion of the first interlocking structure, the transition portion and the first buckle portion of the second interlocking structure are integrally formed to form the special-shaped metal belt; the first buckle The first part includes a first buckling wall, a first bending wall and a first limiting wall connected in sequence, and the first buckling wall, the first bending wall and the first limiting wall at least partially enclose a first buckling space; the second buckling part includes a second buckling wall, a second bending wall and a second limiting wall connected in sequence, and the second buckling wall, the second bending wall and the second limiting wall at least partially enclose a second buckling space; at least a part of the first buckling wall extends into the second buckling space and can move along the axial direction of the metal hose, and at least a part of the second buckling wall extends into the first buckling space and can move along the axial direction of the metal hose.

[0025] In some embodiments, before the spiral multi-layer winding and fastening process of the shaped metal strip, the process includes: folding the metal strip to form a first flattened portion, a turning portion, and a second flattened portion that are sequentially connected along the width direction of the metal strip; the extension direction of the first flattened portion is opposite to the extension direction of the second flattened portion; folding the first flattened portion to form the second fastening portion of the first interlocking structure, and folding the second flattened portion to form the first fastening portion of the second interlocking structure, so as to form the shaped metal strip.

[0026] In some embodiments, the first end of the metal hose and the first end of the airtight shell are located on the same side, the end surface of the first end of the metal hose and the end surface of the first end of the airtight shell are flush, and after the metal hose and the airtight shell are assembled by interference fit, the outer ring and the joint are welded, specifically including:

[0027] The circumferential length of the outer ring is designed according to the circumferential length of the metal hose, and the outer ring is sleeved on the outer side of the first end portion of the metal hose, wherein the outer ring has a first end face and a second end face which are arranged opposite to each other in the axial direction, and the first end face is closer to the end face of the end portion than the second end face, so that a certain distance is maintained between the first end face of the outer ring and the end face of the first end portion of the metal hose along the axial direction of the metal hose;

[0028] Attaching a joint to an end surface of the first end of the airtight shell, with a gap between the outer ring and the joint to form an annular welding area, the gap exposing at least a portion of the first end of the metal hose and at least a portion of the first end of the airtight shell;

[0029] Solder is applied to the annular welding area and the metal hose, the airtight shell, the outer ring and the joint are welded and fixed.

[0030] In some embodiments, after the metal hose, the airtight shell, the outer ring and the joint are welded and fixed, the method further comprises:

[0031] The guide ring is sleeved in the joint, and the guide ring and the joint are welded and fixed.

[0032] In some embodiments, the outer ring includes a first outer ring portion and a second outer ring portion connected in sequence along the axial direction of the outer ring, the circumferential length of the first outer ring portion is slightly larger than the outer diameter of the metal hose, the circumferential length of the second outer ring portion gradually increases along the direction from close to the first outer ring portion to away from the first outer ring portion, and the first outer ring portion is closer to the end face of the first end portion of the metal hose than the second outer ring portion.

[0033] In some embodiments, the joint is annular, and includes a first joint portion extending axially and a second joint portion connected to the first joint portion and extending radially, and the second joint portion is used for fixed connection with the end face of the first end of the airtight shell.

[0034] In some embodiments, after welding the outer ring and the joint, the method further comprises:

[0035] A heat insulation layer is coated on the outside of the metal hose, and two ends of the heat insulation layer are fixedly connected to the joints at the two ends of the metal hose respectively.

[0036] The present application also provides a device for manufacturing a metal airtight hose, which is applied to the method for manufacturing a metal airtight hose as described above, and includes a clamping structure, which can apply pressure in at least two directions to the tube wall of the hose to cause the tube wall of the hose to undergo elastic deformation and can release the pressure applied to the hose to restore the metal hose to its original state.

[0037] In some embodiments, the clamping structure includes a plurality of clamps arranged in a ring shape, and the directions in which the forces applied by the plurality of clamps are all located in the same plane and the magnitudes of the forces applied are balanced with each other.

[0038] In some embodiments, the plurality of clamps include a first clamp and a second clamp that are arranged opposite to each other, the first clamp and the second clamp can apply forces in opposite directions, and the first clamp and the second clamp are connected to form a hollow cylindrical clamp.

[0039] The beneficial effects of this application include:

[0040] In this embodiment, since there are intervals between the multiple U-shaped grooves, the airtight shell plays a buffering role under vibration conditions, avoiding the extrusion between the multi-turn corrugated structures between the airtight shells to cause stress concentration, thereby damaging the airtight shell, helping to extend the service life of the airtight shell and increase the bending flexibility of the airtight shell. In addition, the extended main body and the folded portion of the airtight shell are bent and connected. When the airtight shell is used to form the inner tube of the metal airtight hose and the metal hose is sleeved on the outside of the airtight shell, the contact area of ​​the end face of one side of the U-shaped groove that contacts the wall of the metal hose is increased, so the effective contact is more reliable and durable, and a reliable and effective continuous damping effect can be provided to avoid the mechanical resonance of the metal airtight hose causing excessive vibration of the metal airtight hose. It is beneficial to improve the use effect, avoid the rupture of the metal airtight hose, and extend the service life of the metal airtight hose.

[0041] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] Figure 1 Shown is a structural schematic diagram of a method for manufacturing an airtight shell provided by an exemplary embodiment of the present application;

[0044] Figure 2 Shown Figure 1 The structure shown is a cross-sectional view along the BB section line;

[0045] Figure 3 Shown Figure 2 The structure shown is a magnified view at C1;

[0046] Figure 4 Shown Figure 1 The structure at B1 shown is a schematic diagram of a step in preparing an airtight shell;

[0047] Figure 5 It is a structural schematic diagram of a step in preparing an airtight shell in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0048] Figure 6 The figure shows a schematic diagram of the position relationship of a metal airtight hose provided by an exemplary embodiment of the present application;

[0049] Figure 7 Shown is a structural schematic diagram of each step of a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0050] Figure 8 Shown is a structural schematic diagram of a step in preparing a metal hose in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0051] Fig. 9 Shown Figure 8 The structure shown corresponds to a side view;

[0052] Fig.10 Shown Figure 8 The structure shown is a cross-sectional view along the AA section line;

[0053] Fig.11 Shown Fig.10 The structure shown is an enlarged view at A1;

[0054] Fig.12 Shown is a structural schematic diagram of a step in preparing a metal hose in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0055] Fig.13 Shown is a structural schematic diagram of a step in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0056] Fig.14 Shown is a schematic structural diagram of an outer ring provided by an exemplary embodiment of the present application;

[0057] Fig.15 Shown is a structural schematic diagram of a step in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0058] Fig.16 Shown Fig.15 a front view of the structure shown;

[0059] Fig.17 Shown is a schematic structural diagram of a joint provided by an exemplary embodiment of the present application;

[0060] Fig.18 Shown is a structural schematic diagram of a step in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0061] Fig.19 Shown Fig.18 a front view of the structure shown;

[0062] Fig. 20 Shown is a structural schematic diagram of a step in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0063] Fig.21 Shown Fig. 20 a front view of the structure shown;

[0064] Fig. 22 Shown Fig.21 The structure shown is a cross-sectional view along the CC section line;

[0065] Fig.23 Shown Fig. 22 The structure shown is a magnified view at D1;

[0066] Fig.24 The figure shows a schematic structural diagram of a guide ring provided by an exemplary embodiment of the present application;

[0067] Fig.25 Shown is a structural schematic diagram of a step in a method for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application;

[0068] Fig.26 Shown Fig.25 The structure shown is a cross-sectional view along the DD section line;

[0069] Fig. 27 Shown Fig.26 The structure shown is a magnified view at E1;

[0070] Fig.28 and Fig.29 Shown is a schematic structural diagram of a device for manufacturing a metal airtight hose provided by an exemplary embodiment of the present application.

[0071] In the figure: 1-metal hose; 1a-first end of the metal hose; 2-airtight shell; 2a-first end of the airtight shell; 10a-buffer space; 3-outer ring; 31-first outer ring portion; 32-second outer ring portion; 301-first end face; 302-second end face; 4-joint; 41-first joint portion; 42-second joint portion; 20a-annular welding area; 5-solder; 6-guiding ring; 61-first guide portion; 62-second guide portion ; 10-interlocking structure; 11-first interlocking structure; 12-second interlocking structure; 13-turning part; 111 (121)-first buckle part; 111a-first buckling wall; 111b-first bending wall; 111c-first limiting wall; 112 (122)-second buckle part; 112a-second buckling wall; 112b-second bending wall; 112c-second limiting wall; 101-first flattened part; 102-second flattened part. 20-corrugated structure (U-shaped groove); 21-groove body; 211-first groove wall; 212-second groove wall; 22-extension part; 221-first extension part; 221a-first extension body; 221b-first folding part; 222-second extension part; 222a-second extension body; 222b-second folding part; 100 / 200-special-shaped metal strip; 100' / 200'-metal strip. 300-clamping structure; 310-first clamp; 320-second clamp; 7 (8)-mandrel; 9-circular electrode wheel. DETAILED DESCRIPTION

[0072] The following is a detailed description of the method and device for manufacturing a metal airtight hose in the embodiments of the present application in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments can complement or be combined with each other.

[0073] The present application provides a method for manufacturing an airtight shell, comprising: spirally coiling and welding a shaped metal strip 200 to form a multi-turn corrugated structure 20 that is sequentially arranged and interconnected along the axis direction of the airtight shell 2; Figure 1 , Figure 2 and Figure 3As shown, the shape of the corrugated structure 20 is a U-shaped groove 20 with an opening facing away from the central axis of the airtight shell 2. The U-shaped groove 20 includes a groove body 21 and two extensions 22 respectively connected to the two ends of the opening of the groove body 21. There is a gap x1 between the groove bodies 21 of two adjacent U-shaped grooves 20, and the extensions 22 of the two adjacent U-shaped grooves 20 are connected to each other; the groove body 21 includes a first groove wall 211 and a second groove wall 212 that are oppositely arranged and connected to each other, and the extension 22 includes a first extension 221 and a second extension 222 that are oppositely arranged. The first groove wall 211 extends along the opening end. One end is connected to the first extension part 221, and one end of the second groove wall 212 extending along the open end is connected to the second extension part 222; the first extension part 221 includes a first extension body 221a and a first folding part 221b bent and connected to the first extension body 221a, the second extension part 222 includes a second extension body 222a and a second folding part 222b bent and connected to the second extension body 222a, and the distance x2 between the first extension body 221a and the second extension body 222a is greater than the distance x3 between the first groove wall 211 and the second groove wall 212.

[0074] In this embodiment, since there are intervals between the multiple U-shaped grooves 20, the airtight shell 2 plays a buffering role under vibration conditions, avoiding the extrusion between the multiple turns of the corrugated structure 20 between the airtight shell 2, resulting in stress concentration, thereby damaging the airtight shell 2, which helps to extend the service life of the airtight shell 2 and increase the bending flexibility of the airtight shell 2. In addition, the extended body and the folded part of the airtight shell 2 are bent and connected, so the contact area of ​​the end face of one side of the U-shaped groove 20 that contacts the wall of the metal hose 1 is increased, so the effective contact is more reliable and durable, and a reliable and effective continuous damping effect can be provided to avoid the mechanical resonance of the metal airtight hose causing excessive vibration of the metal airtight hose. It is beneficial to improve the use effect, avoid the rupture of the metal airtight hose, and extend the service life of the metal airtight hose.

[0075] In some embodiments, when the radial cross-section of the airtight shell 2 is circular, Figure 1 As shown, the multi-turn corrugated structure 20 can be formed by spirally winding the airtight shell 2 around a core shaft 8 having a circular radial cross section.

[0076] In some embodiments, the spiral coiling welding process of the shaped metal strip 200 includes:

[0077] The special-shaped metal strip 200 is subjected to a spiral rolling forming process so that the special-shaped metal strip 200 is spirally wound to form a multi-turn corrugated structure 20, and two adjacent corrugated structures 20 are welded and fixed.

[0078] In some embodiments, the adjacent corrugated structures 20 may be fixed by continuous resistance seam welding so that the multi-turn corrugated structures 20 form an integrated structure to achieve air sealing. Figure 4 As shown, the multi-turn corrugated structure 20 can be resistance-welded between two circular electrode wheels 9 .

[0079] In some embodiments, the folded portions of the two adjacent corrugated structures 20 that are in contact with each other can be rolled welded to achieve a fixed connection between the two adjacent spirally arranged corrugated structures. For example, the first corrugated structure is adjacent to the second corrugated structure, and the first folded portion of the first corrugated structure and the second folded portion of the second corrugated structure are in contact with each other. The first folded portion of the first corrugated structure and the second folded portion of the second corrugated structure can be rolled welded to be fixedly connected. In this way, the airtight shell can be sealed with good airtightness to avoid gas leakage.

[0080] In some embodiments, Figure 5 As shown, before the spiral coiling welding process of the special-shaped metal strip 200 is performed, the following steps are also included:

[0081] like Figure 5 Middle (a) to Figure 5 As shown in (b), the metal strip 200' is subjected to pressure forming to form a groove body 21 and a first extension part 221 and a second extension part 222 respectively connected to both ends of the opening end of the groove body 21, an end of the first groove wall 211 extending along the opening end is connected to the first extension part 221, and an end of the second groove wall 212 extending along the opening end is connected to the second extension part 222; the distance between the first extension part 221 and the second extension part 222 is greater than the distance between the first groove wall 211 and the second groove wall 212. Figure 5 Middle (b) to Figure 5 As shown in (c), the first extending portion 221 is folded to form a first extending body 221 a and a first folded portion 221 b, and the second extending portion 222 is folded to form a second extending body 222 a and a second folded portion 222 b, so as to form the special-shaped metal strip 200 .

[0082] In some embodiments, a cleaning process is further included after the spiral coiling and welding process is performed on the shaped metal strip 200. In one example, the cleaning process includes draining and drying.

[0083] In some embodiments, after welding and fixing the two adjacent corrugated structures 20, the process further includes: performing relative compression on the two ends of the multi-turn corrugated structure 20 to shorten the axial length of the two ends of the multi-turn corrugated structure 20, that is, shortening the width of the adjacent U-shaped grooves at the two ends. In this way, a larger contact area can be provided for the subsequent end face welding joint of the metal airtight hose, which is conducive to the reliable implementation of the subsequent welding process.

[0084] Considering that if there is a gap between the mutually nested metal hose 1 and the airtight shell 2, the tube wall between the metal hose 1 and the airtight shell 2 may be relatively displaced, which may easily lead to discontinuous collision between the metal hose and the airtight shell when the car vibrates, which may cause the destruction of mechanical resonance in the metal airtight hose, resulting in excessive vibration of the metal airtight hose and its connectors, which may accelerate fatigue, aggravate wear, and cause the hose to rupture or leak. However, if the mutually nested metal hose 1 and the airtight shell 2 are completely fitted and fixed to each other, since there is no gap between the metal hose 1 and the airtight shell 2, the heat insulation effect is likely to deteriorate, and the temperature of the metal airtight hose can be as high as several hundred degrees Celsius when the engine is running, which is easy to damage the non-high temperature resistant parts around the metal airtight hose. If an irregularly shaped metal hose 1 and an airtight shell 2 are designed, when the metal hose 1 and the airtight shell 2 are installed, it is necessary to fix the metal hose and the airtight shell tube wall along the entire length direction of the axis by welding or bonding to avoid resonance damage. At this time, the welding or bonding process needs to be carried out in the internal space of the tube wall of one of the metal hose and the airtight shell, which is not easy to achieve in actual operation and the fixing effect is not good.

[0085] Therefore, the present application also provides a method for manufacturing a metal airtight hose, such as Figure 6 As shown, the metal airtight hose comprises a metal hose 1 and an airtight shell 2, Figure 7 As shown, the radial cross-section of the metal hose 1 is non-circular. Figure 7 Taking the elliptical radial cross-sectional shape of the metal hose as an example, the minimum inner diameter d1 of the metal hose 1 is smaller than the maximum outer diameter d2 of the airtight shell 2, and the diameter of the circle corresponding to the inner circumferential length of the metal hose 1 is larger than the maximum outer diameter d2 of the airtight shell; the manufacturing method comprises the following steps:

[0086] Step 100: Figure 7 Middle (a) to Figure 7 As shown in (b), pressure is applied to the wall of the metal hose 1 to cause the wall of the metal hose 1 to undergo elastic deformation until the minimum inner diameter of the metal hose 1 is larger than the maximum outer diameter d2 of the airtight shell; that is, the minimum inner diameter of the metal hose 1 is Figure 7 The d1 shown in (a) becomes Figure 7 d1' shown in (b);

[0087] Step 200: Figure 7 As shown in (c), the minimum inner diameter of the metal hose 1 is kept at d1', and the airtight shell 2 is sleeved on the inner side of the metal hose 1;

[0088] Step 300: Figure 7As shown in (d), the pressure is released to make the metal hose 1 rebound. After the metal hose 1 rebounds, at least two contact lines (L1, L2) are formed between the metal hose 1 and the airtight shell 2 in the full length direction of the axis. An air layer 10a is formed in the area other than the contact lines (L1, L2) between the metal hose 1 and the airtight shell 2, thus completing the interference fit assembly between the metal hose 1 and the airtight shell 2.

[0089] In this embodiment, by utilizing the elasticity of the metal hose 1 and elastically deforming the metal hose 1, the metal hose 1 and the airtight shell 2, which are originally incompatible with each other, can be made to achieve interference fit. The manufacturing method is simple and the manufacturing cost is low. In the metal airtight hose prepared by the manufacturing method, the metal hose 1 and the airtight shell 2 form an interference fit area with at least two contact lines (L1, L2) in the full length direction of the axis. When the metal airtight hose vibrates, the contact friction between the metal hose 1 and the airtight shell 2 can generate continuous damping in the full length direction of the axis, which can avoid the resonance destruction of the metal airtight hose, and further avoid the safety hazards such as the breakage of the metal airtight hose or the leakage of the metal airtight hose caused by the excessive vibration of the metal hose 1 and the airtight shell 2. In addition, since the prepared metal hose 1 and the airtight shell 2 form an air interlayer 10a in the area other than the contact line (L1, L2), the air interlayer 10a can be used as an insulating space, which reduces the transfer and dissipation of heat generated by the metal airtight hose, and avoids the high temperature effect on the vehicle parts around the metal airtight hose, such as oil pipes, wires, plastic parts, etc. Furthermore, the air interlayer maintains a certain temperature in the exhaust pipe, improves the thermal efficiency of post-processing, and can also reduce noise and environmental noise pollution. The metal airtight hose prepared by the manufacturing method has high reliability.

[0090] In some embodiments, step 100 specifically includes the following steps:

[0091] A plurality of radially balanced forces are applied to at least one radial cross-sectional profile surface of the metal hose 1, so that the radial spacing distance between the two points with the largest spacing on the radial cross-sectional profile of the metal hose 1 is reduced, and the radial spacing distance between the two points with the smallest spacing on the radial cross-sectional profile of the metal hose 1 is increased, until the radial cross-sectional profile of the metal hose is circular.

[0092] Since the circle has the largest area, in this embodiment, when the radial cross-section of the metal hose 1 is elastically deformed into a circle, the airtight shell 2 with the largest cross-sectional area can be accommodated. At this time, the maximum distance between two points on the radial cross-sectional profile of the airtight shell 2 is smaller than the minimum distance between two points on the radial cross-sectional profile of the metal hose 1. The airtight shell 2 can be directly sleeved in the metal hose 1, and then the metal hose 1 rebounds and forms an interference fit with the airtight shell 2.

[0093] In some embodiments, the radial cross-sectional profile of the metal hose 1 includes an ellipse, a triangle, a rectangle or other polygons.

[0094] like Figure 7 As shown, in some embodiments, the airtight shell is circular. In other embodiments, the airtight shell may also be elliptical, triangular, rectangular or other polygonal (not shown in the drawings).

[0095] In some embodiments, before the metal hose 1 and the airtight shell 2 are assembled by interference fit, the metal hose 1 is also made. Figure 8 As shown, specifically including:

[0096] The shaped metal belt 100 is subjected to a spiral multi-layer winding and buckling process, so that the shaped metal belt 100 forms a multi-turn interlocking structure 10 which is sequentially arranged and interconnected along the axial direction of the metal hose 1 .

[0097] In some embodiments, Fig. 9 As shown, the spiral multi-layer winding and buckling process of the shaped metal belt 100 specifically includes: spirally winding and buckling the shaped metal belt 100 around the core shaft 7, the radial cross-section of the core shaft 7 is non-circular, and in this embodiment, the radial cross-section of the core shaft 7 is an elliptical shape. In the process of winding and buckling:

[0098] The rotation speed v1 of the mandrel 7 is controlled to remain unchanged, and the feeding speed v2 of the shaped metal strip 100 is controlled to change with the circumferential length of the shaped metal strip around the circumference of the mandrel per unit time.

[0099] In some embodiments, when the rotation speed v1 of the mandrel 7 is controlled to remain unchanged, the feeding speed v2 of the shaped metal strip 100 is in the range of 40-50 m / min.

[0100] In other embodiments, during the coiling and fastening process, the feeding speed v2 of the shaped metal strip 100 can be kept constant, while the rotation speed v1 of the core shaft can be controlled to change with the circumferential length of the shaped metal strip 100 around the circumference of the covering core shaft 7 per unit time.

[0101] In some embodiments, Fig.10 and Fig.11As shown, the multi-turn interlocking structure 10 includes adjacent first interlocking structures 11 and second interlocking structures 12 and a transition portion 13 located between the first interlocking structure 11 and the second interlocking structure 12, the first interlocking structure 11 and the second interlocking structure 12 respectively include a first buckle portion and a second buckle portion that buckle with each other, the second buckle portion 112 of the first interlocking structure 11 and the first buckle portion 121 of the second interlocking structure 12 are connected through the transition portion 13, and the second buckle portion 112 of the first interlocking structure 11, the transition portion 13 and the first buckle portion 121 of the second interlocking structure 12 are integrally formed to form a special-shaped metal strip 100; the first buckle portion 111 includes first buckling walls 112 that are sequentially connected. 11a, a first bending wall 111b and a first limiting wall 111c, the first buckling wall 111a, the first bending wall 111b and the first limiting wall 111c at least partially enclose a first buckling space; the second buckling portion 112 includes a second buckling wall 112a, a second bending wall 112b and a second limiting wall 112c connected in sequence, the second buckling wall 112a, the second bending wall 112b and the second limiting wall 112c at least partially enclose a second buckling space; at least part of the first buckling wall 111a extends into the second buckling space and can move along the axial direction of the metal hose 1, and at least part of the second buckling wall 112a extends into the first buckling space and can move along the axial direction of the metal hose 1.

[0102] In this embodiment, a plurality of interlocking structures 10 are sequentially connected to form a metal hose 1, and the metal hose 1 is fixed and formed by the buckle portion of the interlocking structure 10, so that the formed metal hose 1 has high structural strength and is stable. In addition, two adjacent interlocking structures 10 in the metal hose 1 can move relative to each other within a certain range, so the length of the metal hose 1 can be flexibly changed, and the length of the metal hose 1 can be flexibly set according to the specific structural requirements of the exhaust system. And when the metal airtight hose is subjected to adverse working conditions such as vibration, the flexible expansion and contraction of the metal hose 1 can provide a buffering effect to avoid the metal airtight hose from being broken due to concentrated force.

[0103] In some embodiments, the material of the special-shaped metal strip 100 can be stainless steel, copper alloy or other metals.

[0104] In some embodiments, Fig.12 As shown, before the spiral multi-layer coiling and buckling process of the special-shaped metal strip 100 is performed, the following steps are included:

[0105] like Fig.12 Middle (a) to Fig.12 As shown in (b), the metal strip 100' is folded to form a first flattened portion 101, a turning portion 13 and a second flattened portion 102 which are sequentially connected along the width direction of the metal strip 100'; the extension direction of the first flattened portion 101 is opposite to the extension direction of the second flattened portion 102; Fig.12 Middle (b) to Fig.12 As shown in (c), the first flattened portion 101 is folded to form the second buckle portion 112 of the first interlocking structure 11, and the second flattened portion 102 is folded to form the first buckle portion 121 of the second interlocking structure 12, so as to form a special-shaped metal strip.

[0106] It should be noted that, in the present application, the folding or bending of the metal strip 100 ′ can be achieved by performing pressure forming on the metal strip 100 ′ using a mold.

[0107] In some embodiments, after the metal strip 100' is subjected to pressure forming by a die to form the shaped metal strip 100, the process further includes: coating an emulsion on the surface of the shaped metal strip 100. In this embodiment, the emulsion can be used to lubricate and clean the metal strip 100', thereby reducing the friction between the shaped metal strip 100 and the manufacturing equipment in the subsequent process and protecting the shaped metal strip 100 from damage.

[0108] In some embodiments, the emulsion coating may be achieved by immersing the shaped metal strip 100 in an emulsion tank.

[0109] In some embodiments, Fig.13 As shown, the first end 1a of the metal hose 1 and the first end 2a of the airtight shell 2 are located on the same side, and the end surface of the first end 1a of the metal hose 1 is flush with the end surface of the first end 2a of the airtight shell 2. After the metal hose 1 and the airtight shell 2 are assembled by interference fit, the outer ring and the joint are welded, which specifically include:

[0110] like Fig.14 As shown, the circumferential length of the outer ring 3 is designed according to the circumferential length of the metal hose 1; Fig.15 As shown, the outer ring 3 is sleeved on the outer side of the first end portion 1a of the metal hose 1, and the outer ring 3 has a first end face 301 and a second end face 302 which are arranged opposite to each other in the axial direction; Fig.15 and Fig.16 As shown, the first end face 301 is closer to the end face of the first end portion 1a than the second end face 302, so that a certain distance x4 is maintained between the first end face 301 of the outer ring 3 and the end face of the first end portion 1a of the metal hose 1 along the axial direction of the metal hose 1;

[0111] like Fig.17 , Fig.18 and Fig.19 As shown, the joint 4 is attached to the end surface of the first end 2a of the airtight shell 2, and there is a gap between the outer ring 3 and the joint 4 to form an annular welding area 20a, and the gap exposes at least a portion of the first end 1a of the metal hose 1 and at least a portion of the first end 2a of the airtight shell 2;

[0112] like Fig. 20 , Fig.21 , Fig. 22 and Fig.23 As shown, solder 5 is applied to the annular welding area 20 a and the metal hose 1 , the airtight shell 2 , the outer ring 3 and the joint 4 are welded and fixed.

[0113] In this embodiment, after the metal hose 1 is sleeved on the outside of the airtight shell 2, the position of the metal hose 1 is first fixed by the outer ring 3, and then the joint 4 is attached to the end face of the first end 2a of the airtight shell 2. The outer ring 3 and the joint 4 can jointly form a bearing surface for the solder 5, exposing the metal hose 1 and the airtight shell 2. By filling the solder 5 in the annular welding area 20a, the metal hose 1, the airtight shell 2, the outer ring 3 and the joint 4 can be welded and fixed, thereby avoiding the metal airtight hose from rupture or even leakage due to loose welding between the outer ring 3 and the joint 4, and improving the reliability and airtightness of the assembly welding fixation.

[0114] It should be noted that, as in the aforementioned embodiment, the two ends of the airtight shell 2 are subjected to relative compression treatment, and its beneficial effect is also reflected in the fact that when welding the outer ring and the joint in this embodiment, the contact area between the first end of the airtight shell 2 and the solder 5 can be increased through relative compression treatment, thereby improving the firmness of the welding.

[0115] In some embodiments, spot welding may be used to initially fix the relative positions of the metal hose 1 , the airtight shell 2 , the outer ring 3 and the joint 4 , and then ring welding may be performed to firmly weld and fix the metal hose 1 , the airtight shell 2 , the outer ring 3 and the joint 4 .

[0116] In some embodiments, the welding method includes fusion welding, pressure welding and brazing. In some embodiments, fusion welding may specifically include MIG welding (Melt Inert-Gas Welding), MAG welding (Metal Active-Gas Welding), TIG welding (Tungsten Inert Gas Welding) and laser welding.

[0117] In some embodiments, Fig.15 or Fig.16 As shown, the spacing x4 between the first end face 301 of the outer ring 3 and the end face of the first end portion 1a of the metal hose 1 along the axial direction of the metal hose 1 is 1-10 mm. In some embodiments, the spacing may be 1 mm, 2 mm, 4 mm, 6 mm, 8 mm and 10 mm.

[0118] In some embodiments, Fig.24 , Fig.25 , Fig.26 and Fig. 27As shown, after the metal hose 1 , the airtight shell 2 , the outer ring 3 and the joint 4 are welded and fixed, the following steps further include: sleeve the guide ring 6 inside the joint 4 , and weld and fix the guide ring 6 and the joint 4 .

[0119] In some embodiments, the guide ring 6 may be welded to the inner wall surface of the joint 4 using a spot welding process. In one example, the guide ring 6 may be welded to the inner wall surface of the joint 4 using three points evenly spaced at 120°.

[0120] In some embodiments, Fig.14 As shown, the outer ring 3 includes a first outer ring portion 31 and a second outer ring portion 32 which are connected in sequence along the axial direction of the outer ring 3. The circumferential length of the first outer ring portion 31 is slightly larger than the outer diameter of the metal hose 1. The circumferential length of the second outer ring portion 32 gradually increases from close to the first outer ring portion 31 to away from the first outer ring portion 31. The first outer ring portion 31 is closer to the end face of the first end portion 1a of the metal hose 1 than the second outer ring portion 32.

[0121] There is a gap between the second outer ring portion 32 of the outer ring 3 used in this embodiment and the metal hose 1. Therefore, when the outer ring 3 is sleeved on the outside of the metal hose 1, the second outer ring portion 32 provides a certain tolerance space to make it easier for the outer ring 3 to be sleeved on the outside of the metal hose 1.

[0122] In some embodiments, Fig.24 As shown, the joint 4 is annular and includes a first joint portion 41 extending axially and a second joint portion 42 connected to the first joint portion 41 and extending radially. The second joint portion 42 is used for fixed connection with the end surface of the first end portion 2a of the airtight shell 2.

[0123] In some embodiments, Fig.16 As shown, the guide ring 6 includes a first guide portion 61 and a second guide portion 62 which are connected in sequence along the axial direction of the guide ring 6. The circumferential length of the first guide portion 61 is slightly smaller than the inner diameter of the first joint portion 41 and is sleeved on the inner side of the first joint portion 41. The circumferential length of the second guide portion 62 gradually decreases in the direction from close to the first guide portion 61 to away from the first guide portion 61.

[0124] In some embodiments, after welding the outer ring 3 and the joint 4, the method further includes: coating the outer side of the metal hose 1 with a heat insulation layer (not shown in the figure), and fixing the two ends of the heat insulation layer to the joints at the two ends of the metal hose.

[0125] Based on the same inventive concept, the present application also provides a manufacturing device for a metal airtight hose, which is applied to the manufacturing method in the aforementioned embodiment, such as Fig.28As shown, the manufacturing device includes a clamping structure 300, which can apply pressure in at least two directions to the wall of the metal hose 1 to elastically deform the wall of the metal hose 1 and release the pressure applied to the metal hose 1 to restore the metal hose to its original state.

[0126] In some embodiments, the clamping structure 300 includes a plurality of clamps arranged in a ring shape, and the directions in which the forces applied by the plurality of clamps are located in the same plane and the magnitudes of the forces applied are balanced with each other.

[0127] In some embodiments, the number of clamps can be 2, 3, 4, 5, 6, 7, 8 or other positive integers.

[0128] In some embodiments, Fig.28 and Fig.29 As shown, the plurality of clamps include a first clamp 310 and a second clamp 320 that are arranged opposite to each other. The first clamp 310 and the second clamp 320 can apply forces in opposite directions. The first clamp 310 and the second clamp 320 are connected to form a hollow cylindrical clamp.

[0129] It should be pointed out that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0130] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

Claims

1. A method for manufacturing a metal airtight hose, characterized in that: The metal airtight hose comprises a metal hose and an airtight shell, the radial cross-section of the metal hose is non-circular, the minimum inner diameter of the metal hose is smaller than the maximum outer diameter of the airtight shell, and the diameter of a circle corresponding to the inner circumferential length of the metal hose as the circumference is larger than the maximum outer diameter of the airtight shell; the manufacturing method comprises: Applying pressure to the tube wall of the metal hose to cause elastic deformation of the tube wall of the metal hose until the minimum inner diameter of the metal hose is larger than the maximum outer diameter of the airtight shell; The airtight shell is arranged inside the metal hose; The pressure is released to make the metal hose rebound. After the metal hose rebounds, at least two contact lines are formed between the metal hose and the airtight shell in the full length direction of the axis, and an air sandwich is formed between the metal hose and the airtight shell except for the contact lines, that is, the interference fit assembly between the metal hose and the airtight shell is completed; Wherein, the method for manufacturing the airtight shell comprises: The special-shaped metal strip is subjected to a spiral coil welding process so that the special-shaped metal strip forms a multi-turn corrugated structure arranged in sequence and connected to each other along the axial direction of the airtight shell; the shape of the corrugated structure is a U-shaped groove with an opening away from the central axis of the airtight shell, the U-shaped groove includes a groove body and two extensions respectively connected to the two ends of the opening end of the groove body, there is a gap between the groove bodies of two adjacent U-shaped grooves, and the extensions of the two adjacent U-shaped grooves are connected to each other; the groove body includes a first groove wall and a second groove wall that are arranged oppositely and connected to each other, the extension part includes a first extension part and a second extension part that are arranged oppositely, one end of the first groove wall extending along the opening end is connected to the first extension part, and one end of the second groove wall extending along the opening end is connected to the second extension part; the first extension part includes a first extension body and a first folding part that is bent and connected to the first extension body, the second extension part includes a second extension body and a second folding part that is bent and connected to the second extension body, and the spacing between the first extension body and the second extension body is greater than the spacing between the first groove wall and the second groove wall.

2. The method for manufacturing a metal airtight hose according to claim 1, characterized in that: In the method for manufacturing the airtight shell, the spiral coiling and welding process of the special-shaped metal strip includes: spirally rolling the special-shaped metal strip to spirally coil the special-shaped metal strip to form a multi-turn corrugated structure, and welding and fixing two adjacent corrugated structures.

3. The method for manufacturing a metal airtight hose according to claim 1, characterized in that: Before the spiral coiling welding process is performed on the special-shaped metal strip, the process also includes: performing pressure forming process on the metal strip to form a trough body and the first extension part and the second extension part respectively connected to the two ends of the opening end of the trough body, the end of the first trough wall extending along the opening end is connected to the first extension part, and the end of the second trough wall extending along the opening end is connected to the second extension part; the spacing between the first extension part and the second extension part is greater than the spacing between the first trough wall and the second trough wall; folding the first extension part to form the first extension body and the first folded part, and folding the second extension part to form the second extension body and the second folded part, so as to form the special-shaped metal strip.

4. The method for manufacturing a metal airtight hose according to claim 2, characterized in that: After the two adjacent corrugated structures are welded and fixed, the method further includes: performing relative compression processing on the two ends of the multi-turn corrugated structure to shorten the axial length of the partial corrugated structure at the two ends of the multi-turn corrugated structure.

5. The method for manufacturing a metal airtight hose according to claim 1, characterized in that: The step of applying pressure to the tube wall of the metal hose to elastically deform the tube wall of the metal hose until the minimum inner diameter of the metal hose is larger than the maximum outer diameter of the airtight shell comprises: A plurality of radially balanced forces are applied to at least one radial cross-sectional profile surface of the metal hose, so that the radial spacing distance between the two points with the largest spacing on the radial cross-sectional profile of the metal hose is reduced, and the radial spacing distance between the two points with the smallest spacing on the radial cross-sectional profile of the metal hose is increased, until the radial cross-sectional profile of the metal hose becomes circular.

6. The method for manufacturing a metal airtight hose according to claim 1, characterized in that: The radial cross-sectional profile of the metal hose may be in the shape of an ellipse, a triangle, a rectangle or other polygons.

7. The method for manufacturing a metal airtight hose according to claim 1, characterized in that: Before the metal hose and the airtight shell are assembled by interference fit, the metal hose is also manufactured, which specifically includes: The special-shaped metal belt is subjected to a spiral multi-layer winding and buckling process, so that the special-shaped metal belt forms a multi-turn interlocking structure which is sequentially arranged and interconnected along the axial direction of the metal hose.

8. The method for manufacturing a metal airtight hose according to claim 7, characterized in that: The spiral multi-layer winding and buckling process of the special-shaped metal belt comprises: The special-shaped metal strip is spirally coiled and fastened around a mandrel, wherein the radial cross-section of the mandrel is non-circular. During the coiling and fastening process: Controlling the rotation speed of the mandrel to remain constant, and controlling the feeding speed of the shaped metal strip to change with the circumferential length of the shaped metal strip covering the circumference of the mandrel per unit time; Alternatively, the feeding speed of the shaped metal strip is controlled to remain unchanged, and the rotation speed of the mandrel is controlled to change with the circumferential length of the shaped metal strip covering the circumferential surface of the mandrel per unit time.

9. The method for manufacturing a metal airtight hose according to claim 7, characterized in that: The multi-turn interlocking structure includes adjacent first and second interlocking structures and a transition portion located between the first and second interlocking structures, the first and second interlocking structures each include a first buckle portion and a second buckle portion that buckle with each other, the second buckle portion of the first interlocking structure is connected to the first buckle portion of the second interlocking structure through the transition portion, and the second buckle portion of the first interlocking structure, the transition portion and the first buckle portion of the second interlocking structure are integrally formed to form the special-shaped metal belt; the first buckle portion includes a first buckling wall, a first bending wall and a first limiting wall connected in sequence, the first buckling wall, the first bending wall and the first limiting wall at least partially enclose a first buckling space; the second buckle portion includes a second buckling wall, a second bending wall and a second limiting wall connected in sequence, the second buckling wall, the second bending wall and the second limiting wall at least partially enclose a second buckling space; At least a portion of the first buckling wall extends into the second buckling space and can move along the axial direction of the metal hose, and at least a portion of the second buckling wall extends into the first buckling space and can move along the axial direction of the metal hose.

10. The method for manufacturing a metal airtight hose according to claim 9, characterized in that: The spiral multi-layer winding and buckling process of the special-shaped metal belt includes: The metal strip is folded to form a first flattened portion, a turning portion, and a second flattened portion which are sequentially connected along the width direction of the metal strip; the extension direction of the first flattened portion is opposite to the extension direction of the second flattened portion; the first flattened portion is folded to form the second buckle portion of the first interlocking structure, and the second flattened portion is folded to form the first buckle portion of the second interlocking structure, so as to form the special-shaped metal strip.

11. The method for manufacturing a metal airtight hose according to claim 1, characterized in that: The first end of the metal hose and the first end of the airtight shell are located on the same side, the end surface of the first end of the metal hose and the end surface of the first end of the airtight shell are flush, and after the metal hose and the airtight shell are assembled by interference fit, a welding outer ring and a joint are also included, specifically including: The circumferential length of the outer ring is designed according to the circumferential length of the metal hose, and the outer ring is sleeved on the outer side of the first end portion of the metal hose, wherein the outer ring has a first end face and a second end face which are arranged opposite to each other in the axial direction, and the first end face is closer to the end face of the end portion than the second end face, so that a certain distance is maintained between the first end face of the outer ring and the end face of the first end portion of the metal hose along the axial direction of the metal hose; Attaching a joint to an end surface of the first end of the airtight shell, with a gap between the outer ring and the joint to form an annular welding area, the gap exposing at least a portion of the first end of the metal hose and at least a portion of the first end of the airtight shell; Solder is applied to the annular welding area and the metal hose, the airtight shell, the outer ring and the joint are welded and fixed.

12. The method for manufacturing a metal airtight hose according to claim 11, characterized in that: After the metal hose, the airtight shell, the outer ring and the joint are welded and fixed, the following steps are further included: The guide ring is sleeved in the joint, and the guide ring and the joint are welded and fixed.

13. The method for manufacturing a metal airtight hose according to claim 12, characterized in that: The outer ring includes a first outer ring portion and a second outer ring portion which are connected in sequence along the axial direction of the outer ring, the circumferential length of the first outer ring portion is slightly larger than the outer diameter of the metal hose, the circumferential length of the second outer ring portion gradually increases along the direction from close to the first outer ring portion to away from the first outer ring portion, and the first outer ring portion is closer to the end face of the first end portion of the metal hose than the second outer ring portion.

14. The method for manufacturing a metal airtight hose according to claim 11, characterized in that: The joint is annular and includes a first joint portion extending in the axial direction and a second joint portion connected to the first joint portion and extending in the radial direction, wherein the second joint portion is used for fixed connection with the end surface of the first end portion of the airtight shell.

15. The method for manufacturing a metal airtight hose according to claim 11, characterized in that: After welding the outer ring and the joint, the following steps are further included: A heat insulation layer is coated on the outside of the metal hose, and two ends of the heat insulation layer are fixedly connected to the joints at the two ends of the metal hose respectively.

16. A manufacturing device for a metal airtight hose, applied to the manufacturing method for a metal airtight hose according to any one of claims 1 to 15, characterized in that: The clamping structure comprises a clamping structure, which can apply pressure in at least two directions to the tube wall of the metal hose to make the tube wall of the metal hose elastically deformed, and can release the pressure applied to the metal hose to restore the metal hose to its original state.

17. The manufacturing device of the metal airtight hose according to claim 16, characterized in that: The clamping structure comprises a plurality of clamps arranged in a ring shape, the directions in which the forces applied by the plurality of clamps are all located in the same plane and the magnitudes of the forces applied are balanced with each other.

18. The manufacturing device of the metal airtight hose according to claim 17, characterized in that: The plurality of clamps include a first clamp and a second clamp that are arranged opposite to each other. The first clamp and the second clamp can apply forces in opposite directions. The first clamp and the second clamp are connected to form a hollow cylindrical clamp.

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