CN112025094A - Connecting piece for laser welding of liner of IV-type hydrogen storage bottle - Google Patents
Connecting piece for laser welding of liner of IV-type hydrogen storage bottle Download PDFInfo
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- CN112025094A CN112025094A CN202010922375.9A CN202010922375A CN112025094A CN 112025094 A CN112025094 A CN 112025094A CN 202010922375 A CN202010922375 A CN 202010922375A CN 112025094 A CN112025094 A CN 112025094A
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- storage bottle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/30—Organic material
- B23K2103/42—Plastics
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Abstract
The invention discloses a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle, which is made of a transparent material with high barrier property and is in a circular ring-shaped structure, wherein the maximum outer diameter of the circular ring-shaped structure is consistent with the outer diameter of the inner container to be welded, the minimum inner diameter is less than or equal to the inner diameter of the inner container to be welded, and the thickness of a welding seam is greater than or equal to the wall thickness of the inner container to be welded. The cross section of the circular ring-shaped structure is in a convex shape, an inverted trapezoid shape, a rectangular shape, an inverted triangle shape, an inverted convex shape or an I-shaped structure, the requirements of the barrier property and the laser butt welding uniformity of the high-barrier-property opaque high-polymer composite material are considered, and the barrier property of the welding line is not reduced while the quality uniformity of the laser butt welding line is improved. Meanwhile, the influence of material modification on the laser welding performance is also considered, the laser welding strength and the sealing performance of the hydrogen storage bottle opaque liner are improved by using the adhesive, modifying treatment, adding the absorbent and the like, the outer surface of the hydrogen storage bottle opaque liner after laser welding is flat, smooth and free of protrusions, and the later-stage liner fiber winding process treatment is facilitated.
Description
Technical Field
The invention relates to the field of high-pressure hydrogen storage and high polymer material laser welding forming, in particular to a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle.
Technical Field
The hydrogen becomes an important component of the new energy industry due to the advantages of high combustion cleanliness and high energy density, wherein the cylinder hydrogen storage technology is an important part for developing new hydrogen energy. The gas cylinder hydrogen storage (pressure hydrogen storage) technology is most widely applied to new energy automobiles, tube bundle hydrogen storage vehicles and the like. At present, the gas cylinder hydrogen storage technology is developing towards high-capacity high-pressure high-density hydrogen storage, and the most advanced hydrogen storage cylinder is an IV-type hydrogen storage cylinder. One of the most important components of type IV hydrogen storage bottles is a plastic liner. The existing IV-type hydrogen storage bottle plastic inner container forming method comprises blow molding, rotational molding, extrusion, injection molding and welding forming. Compared with the blow molding and rotational molding technologies, the extrusion, injection molding and welding molding have the advantages of high molding efficiency, high precision and easy molding of complex bottle mouth structures in the molding of the hydrogen storage plastic liner, and are widely researched. One of the difficulties of the comprehensive technology is the high-efficiency and high-precision automatic welding of the inner container. Currently, the most common welding technique for welding plastic liners for type iv hydrogen storage bottles is laser welding. Laser welding has the following advantages: (1) high efficiency, short period and suitability for mass production; (2) the welding quality is high, and the sealing performance is good; (3) automatic welding can be realized by using a computer; (4) reliable welding of dissimilar polymers is enabled.
The liner material of the IV-type hydrogen storage bottle is mostly an opaque material, such as a composite material mainly made of High Density Polyethylene (HDPE) or nylon (PA), and cannot be directly used for laser welding. Aiming at solving the technical problem that the opaque inner container material can not be directly welded while the barrier property and the strength of the material are ensured by laser welding, the connector for laser welding the inner container of the IV-type hydrogen storage bottle is urgently developed aiming at the requirement of a high-pressure high-capacity tube bundle hydrogen storage bottle with the pressure of more than 50 MPa.
Disclosure of Invention
The invention provides a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle, which can solve the problem that laser cannot uniformly and deeply weld an interface in the laser butt welding process of a high-barrier opaque material. Compared with the original structure and process for welding the plastic liner for the high-pressure hydrogen storage bottle by laser butt welding, the invention can provide a more reliable and uniform welding structure and mode for the high-performance welding of the plastic liner for the high-pressure hydrogen storage bottle.
The technical scheme of the invention is as follows: the connecting piece for laser welding the liner of the IV-type hydrogen storage bottle is made of transparent materials with high barrier property and is in a circular ring-shaped structure, the maximum outer diameter of the circular ring-shaped structure is consistent with the outer diameter of the liner to be welded, the minimum inner diameter is smaller than or equal to the inner diameter of the liner to be welded, and the thickness of the welding seam is larger than or equal to the wall thickness of the liner to be welded.
The connecting piece for laser welding the liner of the IV-type hydrogen storage bottle has the advantages that the circular structural section is preferably the section similar to the convex shape, namely the section similar to the convex shape, and the gas leakage path is prolonged, so that the barrier property is improved. The end surfaces of two sides of the upper end of the convex section are respectively in close contact with the end surface of the inner container, so that laser welding is facilitated; the lower end of the convex-shaped section is used for supporting and guiding and can prolong the length of the gas leakage path.
The invention relates to a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle, which adopts the following welding connection mode: the connecting piece is a transparent convex-shaped section connecting piece, the outer surfaces of two circular rings with smaller diameter sizes at the left end and the right end are matched with the inner surface of the opaque inner container of the hydrogen storage bottle, and the positioning effect of laser welding the opaque inner containers of the two sections of hydrogen storage bottles is achieved. The large ring with the larger middle diameter size has the two side end surfaces closely attached to the end surfaces of the opaque inner container of the hydrogen storage bottle, so that laser welding is facilitated, the diameter size of the outer surface of the large ring is the same as that of the opaque inner container of the hydrogen storage bottle, the outer surface of the opaque inner container of the hydrogen storage bottle after welding is flat, smooth and free of obvious bulges, and the inner container of the hydrogen storage bottle can be conveniently wound with fibers.
The forming process of the connecting piece for laser welding the liner of the IV-type hydrogen storage bottle adopts an axial variable-diameter extrusion or injection molding process.
The invention relates to a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle, which comprises the following specific connecting processes of a connecting piece structure and an inner container welding piece: and placing the two sections of formed to-be-welded inner containers on a welding operation table, and respectively clamping the two sections of to-be-welded inner containers by using a clamp. And moving the transparent connecting piece to the middle of the two inner containers to be welded through a manipulator. At the moment, the welding guide mechanism is operated to ensure that the end surfaces of the two sections of inner containers to be welded are gradually contacted with and tightly connected with the end surface of the transparent connecting piece. After the two inner containers are tightly contacted, the manipulator for clamping the transparent connecting piece is removed, the centering pressure of the two welding inner containers is continuously kept, and laser irradiation welding is respectively carried out on the contact surfaces of the two inner containers and the transparent connecting piece by using laser welding equipment.
As the structure is preferred, the large ring of the connecting piece with the convex-shaped cross section structure is changed into an inverted trapezoid with a narrow inner part and a wide outer part from a rectangle, the structure enlarges the laser welding area, and further reduces the difficulty of the angle deviation of the laser welding and prolongs the welding seam path. Before welding, the inner container to be welded needs to be machined, so that the end face of the inner container can be tightly attached to the inverted trapezoidal inclined end face of the connecting piece.
As a structural alternative, the structural section of the connecting piece does not adopt a convex section, but directly adopts a rectangular section; as an alternative preferred scheme, the cross section of the connecting piece structure adopts an inverted triangular cross section, the end face of the welded liner needs to be machined, so that the end face of the liner is smooth and flat, and is tightly attached to the end face of the connecting piece structure.
Preferably, the structure of the convex-section connecting piece is changed into an inverted convex-section structure. The connecting mode of the connecting piece and the inner container is as follows: the connecting piece structure is a transparent circular ring with an inverted-convex cross section structure, the middle diameter of the circular ring is smaller, and the end surfaces of the two sides of the circular ring are tightly attached to the end surface of the opaque inner container of the hydrogen storage bottle, so that the positioning effect of laser welding the opaque inner containers of the two sections of hydrogen storage bottles is achieved. The inner surfaces of the left and right circular rings with larger diameter are matched with the outer surface of the opaque inner container of the hydrogen storage bottle, thus being beneficial to laser welding. This circular ring connecting piece of shape of falling protruding font cross-section structure when reducing the laser welding angle skew degree of difficulty, has increased hydrogen storage bottle inner bag and connecting piece laser welding's area, when improving hydrogen storage bottle inner bag laser welding intensity, has effectively prolonged the route of hydrogen seepage. In order to ensure that the outer diameter of the inner container is kept unchanged after the inner container of the hydrogen storage bottle is subjected to laser welding, and the next step of winding and processing of the inner container of the hydrogen storage bottle by fibers is facilitated, the welding part of the inner container of the hydrogen storage bottle needs to be subjected to necking thermal forming process treatment. The basic process of necking and thermoforming the inner container is as follows: the inner container is clamped and fixed at a position which is a certain distance away from the end face of the inner container, the area to be reduced is heated for a certain time, the forming male die is pushed to a specified position along the axial direction of the inner container, the movable forming female die is spirally folded along the radial direction of the inner container, the diameter of the area to be reduced of the area of the reduced area of the inner container is gradually reduced until the diameter is completely attached to the outer surface of the forming male die, the pressure is maintained for a period of time under certain pressure, the inner container is waited to be completely cooled, the forming female die is withdrawn along the radial direction. In addition, when the connecting piece is changed into a circular ring with an inverted-convex cross-section structure, the welding position of the inner container of the hydrogen storage bottle can adopt a variable-diameter extrusion process besides a necking thermoforming treatment process, so that the complicated necking thermoforming treatment work of the inner container before laser welding can be reduced, and the internal stress caused during necking thermoforming can be avoided.
Preferably, the connecting piece with the inverted-convex-shaped cross section structure is changed into the connecting piece with the I-shaped cross section structure, and the inner surface of the outer ring of the connecting piece with the I-shaped cross section structure is matched with the outer surface of the opaque inner container of the hydrogen storage bottle and used for laser irradiation welding. The end surfaces of the two sides of the middle ring are tightly attached to the end surface of the opaque inner container of the hydrogen storage bottle, so that certain pressure can be applied to the two ends of the inner container conveniently. The outer surface of the inner ring is attached to the inner surface of the opaque inner container of the hydrogen storage bottle, and the inner ring and the middle ring play a role in positioning the opaque inner containers of the two hydrogen storage bottles by laser welding, so that the laser welding is facilitated. The diameter size of the outer circular ring is the same as that of the opaque inner container of the hydrogen storage bottle, the outer surface of the opaque inner container of the hydrogen storage bottle after welding is flat, smooth and free of obvious bulges, and the next step of winding and processing of the inner container of the hydrogen storage bottle by fibers is facilitated. The inner ring in the connecting piece with the I-shaped cross section structure can be regarded as a reinforcing rib arranged in the middle of the inner container, so that the rigidity of the inner container can be effectively improved when the inner container of the hydrogen storage bottle is wound with fibers, partial pressure of the fiber winding on the inner container is relieved and offset, stress of a welding interface of the inner container in the working process of part of the hydrogen storage bottle can be shared, and the impact strength of the inner container is enhanced.
As the preferred connection process, when the connecting piece for laser welding the liner of the IV-shaped hydrogen storage bottle has a convex or I-shaped cross section structure, an adhesive can be used between the outer surface of the small-size circular ring and the inner surface of the opaque liner of the hydrogen storage bottle, so that the outer surfaces of the small-size circular rings at the left end and the right end are bonded with the inner surface of the opaque liner of the hydrogen storage bottle, and the connection strength and the sealing property of the liner of the hydrogen storage bottle are improved.
As the preferred connection process, when the connecting piece for laser welding the liner of the IV-type hydrogen storage bottle and the opaque liner of the hydrogen storage bottle are subjected to laser welding, modification treatment such as graft modification, low-temperature plasma treatment and the like can be carried out on the opaque liner of the hydrogen storage bottle in order to increase the laser welding strength. For example, after plasma treatment, the surface wettability and surface free energy of the non-transparent inner container of the hydrogen storage bottle made of the high-density polyethylene material are improved, the adhesion among the materials is obviously improved, and the laser transmission welding performance of the high-density polyethylene material is improved. After plasma treatment, the surface of the opaque inner container of the hydrogen storage bottle generates a plurality of uniform concave-convex, grooves and micro-gaps, thereby increasing the surface roughness of the material and the specific surface area. The increase of the surface roughness of the polymer enables the upper layer material and the lower layer material to easily form mechanical micro riveting in a molten state in the welding process, increases the mutual contact reaction area between the upper layer material and the lower layer material, easily forms Van der Waals force, and improves the welding strength and the sealing property of the liner of the IV-type hydrogen storage bottle.
As the preferred connection process, when the connecting piece structure for laser welding the opaque liner of the IV-type hydrogen storage bottle is laser welded with the opaque liner of the hydrogen storage bottle, in order to increase the laser welding strength of the liner, an absorbent such as carbon black and the like can be added at the welding position of the opaque liner of the hydrogen storage bottle, so that the laser absorption capacity is enhanced, the temperature difference between the opaque liner of the hydrogen storage bottle and the connecting piece made of the transparent nylon material is improved, the laser welding performance is improved, and the utilization rate of laser energy is improved.
The connecting piece structure for laser welding the opaque liner of the IV-type hydrogen storage bottle fully considers the requirements of the high-barrier opaque polymer composite material on barrier property and laser butt welding uniformity, improves the quality uniformity of laser butt welding seams, and does not reduce the barrier property of the welding seams. Meanwhile, the influence of material modification on the laser welding performance is considered, the strength and the sealing performance of the hydrogen storage bottle opaque liner during laser welding are improved by using the adhesive, modifying treatment, adding the absorbent and the like, the outer surface of the hydrogen storage bottle opaque liner after laser welding is flat, smooth and free of protrusions, and the later-stage fiber winding process treatment of the liner is facilitated.
Drawings
FIG. 1 is a schematic view of a welding structure of a connecting piece and a liner for laser welding the liner of an IV-type hydrogen storage bottle;
FIG. 2 is a schematic view showing a structure of a connecting member having a convex cross section for laser welding an inner container of an IV type hydrogen storage bottle;
FIG. 3 is a schematic view of an inverted trapezoidal cross-section welding structure of a preferred embodiment of a connecting member for laser welding an inner container of a type IV hydrogen storage bottle;
FIG. 4 is a schematic view of an alternative welding configuration of a rectangular cross-section for laser welding the liner of a type IV hydrogen storage bottle;
FIG. 5 is a schematic view of an alternative preferred inverted triangular cross-section weld configuration for laser welding a connector for the liner of a type IV hydrogen storage bottle;
FIG. 6 is a schematic view of a welding structure with a reversed-convex-shaped cross section of a preferred embodiment of a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle;
FIG. 7 is a schematic diagram of a welding structure with three I-shaped cross sections of a preferred embodiment of a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle.
In the figure: 1-inner container of hydrogen storage bottle; 2-connecting piece with convex section structure; 3-connecting piece with inverted trapezoidal section structure; 4-a rectangular cross-section structural connector; 5-connecting piece with inverted triangular section structure; 6-connecting piece with inverted convex cross section structure; 7-a connector with an I-shaped section structure; 2-1-a large ring in the middle of the connecting piece with the convex-shaped cross section structure; two small circular rings on two sides of the connecting piece with the 2-2-convex cross-section structure; 6-1-a small middle ring of the connecting piece with the inverted convex cross-section structure; two large circular rings on two sides of the connecting piece with the 6-2-inverted convex cross-section structure; 7-1-I-shaped cross section structure connecting piece outer ring; 7-2-middle ring of the connecting piece with I-shaped section structure; 7-3-I-shaped cross section structure connecting piece inner ring.
Detailed Description
The invention relates to a connecting piece for laser welding an inner container of an IV-type hydrogen storage bottle, which is mainly characterized in that: the material is a high-barrier material, the ring structure and the finished piece are transparent. As shown in fig. 1, the outer diameter of the connecting piece 2 with the convex-shaped cross-section structure is consistent with the outer diameter of the inner container 1, the inner diameter of the connecting piece 2 with the convex-shaped cross-section structure is less than or equal to the inner diameter of the inner container 1, and the thickness of the welding seam is greater than or equal to the wall thickness of the inner container 1. As shown in fig. 2, the connector structure is preferably a connector 2 of a convex cross-sectional structure. As shown in figure 1, the end surfaces of two sides of a large ring 2-1 in the middle of the connecting piece 2 with the convex-shaped cross-section structure are respectively in close contact with the end surface of the inner container 1; the two small circular rings 2-2 on the left side and the right side of the connecting piece 2 with the convex-shaped cross section structure are used for supporting, guiding and prolonging the length of a gas leakage path.
The connecting mode of the connecting piece structure and the liner 1 is as follows: the connecting piece is a connecting piece 2 with a transparent convex-shaped cross section structure, the outer surfaces of two rings 2-2 with smaller diameter sizes at the left end and the right end are matched with the inner surface of the hydrogen storage bottle opaque liner 1, and the positioning effect of laser welding the two sections of hydrogen storage bottle opaque liners 1 is achieved. The end surfaces of two sides of the large ring 2-1 with larger diameter size in the middle are tightly attached to the end surface of the hydrogen storage bottle opaque liner 1, laser welding is facilitated, the diameter size of the outer surface of the large ring 2-1 is the same as that of the hydrogen storage bottle opaque liner 1, and the outer surface of the welded hydrogen storage bottle opaque liner 1 is flat, smooth and free of obvious bulges.
The forming process of the connecting piece for laser welding the liner of the IV-type hydrogen storage bottle adopts an axial variable-diameter extrusion or injection molding process.
The specific connection process of the connecting piece structure and the liner welding piece comprises the following steps: and placing the two sections of formed to-be-welded inner containers on a welding operation table, and respectively clamping the two sections of to-be-welded inner containers by using a clamp. And moving the transparent connecting piece to the middle of the two inner containers to be welded through a manipulator. At the moment, the welding guide mechanism is operated to ensure that the end surfaces of the two sections of inner containers to be welded are gradually contacted with and tightly connected with the end surface of the transparent connecting piece. After the two inner containers are tightly contacted, the manipulator for clamping the transparent connecting piece is removed, the centering pressure of the two welding inner containers is continuously kept, and laser irradiation welding is respectively carried out on the contact surfaces of the two inner containers and the transparent connecting piece by using laser welding equipment.
As shown in fig. 3, it is preferable to change the large ring 2-1 of the structural connection member 2 having a convex cross section from a rectangular shape to an inverted trapezoidal shape having a narrow inner portion and a wide outer portion. The inverted trapezoidal section structure connecting piece 3 enlarges the laser welding area, can effectively reduce the difficulty of the angle deviation of the laser welding and prolong the welding seam path. Before welding, the liner 1 to be welded needs to be machined so that the end face of the liner can be tightly attached to the inclined end face of the inverted trapezoidal section structure connecting piece 3.
As shown in fig. 4, as an alternative structure, the structural section of the connecting piece does not adopt a convex section, but directly adopts a rectangular section 4; as shown in fig. 5, as an alternative preferred scheme, the cross section of the connecting member structure adopts an inverted triangular cross section 5, and the end surface of the liner 1 to be welded needs to be machined, so that the end surface of the liner 1 is smooth and flat and is tightly attached to the end surface of the connecting member structure.
As shown in fig. 6, it is preferable that the connecting member 2 has a convex cross-sectional structure in which the cross-sectional structure is inverted. The connecting mode of the inverted-convex-shaped section structure connecting piece 6 and the liner 1 is as follows: the connecting piece 6 with the inverted-convex-shaped cross section structure is a transparent circular ring with the inverted-convex-shaped cross section structure, the middle diameter of the circular ring 6-1 is smaller, and the end surfaces of the two sides of the circular ring are tightly attached to the end surface of the hydrogen storage bottle opaque liner 1, so that the positioning effect of laser welding the two sections of the hydrogen storage bottle opaque liners 1 is achieved. The inner surfaces of two rings 6-2 with larger diameter sizes at the left and right sides are matched with the outer surface of the opaque inner container 1 of the hydrogen storage bottle, thus being beneficial to laser welding. This inverted-convex cross-sectional structure connecting piece 6 has increased the area of 1 laser welding of hydrogen storage bottle inner bag when reducing the laser welding angle skew degree of difficulty, when improving 1 laser welding intensity of hydrogen storage bottle inner bag, has effectively prolonged the route of hydrogen seepage. In order to ensure that the outer diameter of the inner container 1 is kept unchanged after the inner container of the hydrogen storage bottle is welded by laser and facilitate the next step of filament winding processing of the inner container 1 of the hydrogen storage bottle, the welding part of the inner container 1 of the hydrogen storage bottle needs to be subjected to necking thermal forming process treatment. The basic process of necking and thermoforming the inner container is as follows: the inner container is clamped and fixed at a position which is a certain distance away from the end face of the inner container, the area to be reduced is heated for a certain time, the forming male die is pushed to a specified position along the axial direction of the inner container, the movable forming female die is spirally folded along the radial direction of the inner container, the diameter of the area to be reduced of the area of the reduced area of the inner container is gradually reduced until the diameter is completely attached to the outer surface of the forming male die, the pressure is maintained for a period of time under certain pressure, the inner container is waited to be completely cooled, the forming female die is withdrawn along the radial direction. In addition, when the connecting piece is changed into a circular ring with an inverted-convex cross-section structure, the welding position of the inner container of the hydrogen storage bottle can adopt a variable-diameter extrusion process besides a necking thermoforming treatment process, so that the complicated necking thermoforming treatment work of the inner container before laser welding can be reduced, and the internal stress caused during necking thermoforming can be avoided.
As shown in fig. 7, preferably, the connecting piece 6 with the inverted-convex-shaped cross-section structure is changed into the connecting piece 7 with the i-shaped cross-section structure, and the inner surface of the outer ring 7-1 of the connecting piece 7 with the i-shaped cross-section structure is matched with the outer surface of the opaque inner container 1 of the hydrogen storage bottle for laser irradiation welding. The end surfaces of the two sides of the middle circular ring 7-2 are tightly attached to the end surface of the opaque inner container 1 of the hydrogen storage bottle, so that certain pressure can be conveniently applied to the two ends of the inner container 1. The outer surface of the inner ring 7-3 is attached to the inner surface of the hydrogen storage bottle opaque liner 1, and the inner ring 7-2 and the middle ring play a role in positioning the two sections of hydrogen storage bottle opaque liners 1 by laser welding, so that the laser welding is facilitated. The diameter size of the outer circular ring 7-1 is the same as that of the hydrogen storage bottle opaque liner 1, and the welded hydrogen storage bottle opaque liner 1 is flat, smooth and free of obvious bulges, so that the next step of winding and processing the hydrogen storage bottle liner 1 by fibers is facilitated. The inner ring 7-3 in the connecting piece 7 with the I-shaped cross section structure can be used as a reinforcing rib arranged in the middle of the liner, so that the rigidity of the liner 1 can be effectively improved when the liner of the hydrogen storage bottle is wound with fibers, partial pressure of the liner 1 caused by fiber winding can be relieved and offset, stress of a welding interface of the liner 1 in the working process of part of the hydrogen storage bottle can be shared, and the impact strength of the liner 1 is enhanced.
As the preferred connection process, when the structure of the connecting piece for laser welding the liner 1 of the IV-shaped hydrogen storage bottle is of a convex or I-shaped cross section structure, an adhesive can be used between the outer surface of the small-size circular ring (2-2 or 7-3) and the inner surface of the opaque liner 1 of the hydrogen storage bottle, so that the outer surfaces of the two small-size circular rings (2-2 or 7-3) at the left end and the right end are bonded with the inner surface of the opaque liner 1 of the hydrogen storage bottle, and the connection strength and the sealing property of the liner 1 of the hydrogen storage bottle are improved.
As the preferred connection process, when the connecting piece structure for laser welding the IV-type hydrogen storage bottle liner 1 and the hydrogen storage bottle opaque liner 1 are subjected to laser welding, modification treatment such as graft modification, low-temperature plasma treatment and the like can be carried out on the hydrogen storage bottle opaque liner 1 to increase the laser welding strength. For example, after plasma treatment, the surface wettability and surface free energy of the hydrogen storage bottle opaque inner container 1 of the high-density polyethylene material are improved, the adhesion among the materials is obviously improved, and the laser transmission welding performance of the high-density polyethylene material is improved. After plasma treatment, the surface of the opaque inner container 1 of the hydrogen storage bottle generates a plurality of uniform concave-convex, grooves and micro-gaps, thereby increasing the surface roughness of the material and the specific surface area. The increase of the surface roughness of the polymer enables the upper layer material and the lower layer material to easily form mechanical micro riveting in a molten state in the welding process, increases the mutual contact reaction area between the upper layer material and the lower layer material, easily forms Van der Waals force, and improves the welding strength and the sealing performance of the liner 1 of the IV-type hydrogen storage bottle.
As the preferred connection process, when the connecting piece structure for laser welding the opaque liner 1 of the IV-type hydrogen storage bottle is laser welded with the opaque liner 1 of the hydrogen storage bottle, in order to increase the laser welding strength of the liner 1, an absorbent such as carbon black and the like can be added at the welding part of the opaque liner 1 of the hydrogen storage bottle, so that the laser absorption capacity is enhanced, the temperature difference between the opaque liner 1 of the hydrogen storage bottle and the connecting piece of the transparent nylon material is improved, the laser welding performance is improved, and the utilization rate of laser energy is improved.
Claims (10)
1. A connecting piece for laser welding IV type hydrogen storage bottle inner bag, its characterized in that: the welding seam is made of transparent materials with high barrier property and is in a circular ring-shaped structure, the maximum outer diameter of the circular ring-shaped structure is consistent with the outer diameter of the welded liner, the minimum inner diameter is smaller than or equal to the inner diameter of the welded liner, and the thickness of the welding seam is larger than or equal to the wall thickness of the welded liner.
2. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: the section of the circular ring-shaped structure is in a convex section, and the end surfaces of two sides of the upper end of the convex section are respectively in close contact with the end surface of the liner, so that laser welding is facilitated; the lower end of the convex-shaped section is used for supporting and guiding and can prolong the length of the gas leakage path; the outer surfaces of two rings with smaller diameter sizes at the left end and the right end are matched with the inner surface of the opaque inner container of the hydrogen storage bottle to play a role in positioning the opaque inner container of the two hydrogen storage bottles by laser welding, and the end surfaces at the two sides of the large ring with larger diameter size at the middle are tightly attached to the end surface of the opaque inner container of the hydrogen storage bottle, so that the laser welding is facilitated; the diameter size of the outer surface of the large circular ring is the same as that of the opaque inner container of the hydrogen storage bottle, and the outer surface of the opaque inner container of the hydrogen storage bottle after welding is flat, smooth and free of obvious bulges.
3. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: the section of the circular ring-shaped structure is in an inverted trapezoid shape with a narrow inner part and a wide outer part, and the inner container to be welded is machined to enable the end face of the inner container to be tightly attached to the inverted trapezoid inclined end face of the connecting piece.
4. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: the section shape of the ring-shaped structure is a rectangular section or an inverted triangular section, and the end face of the welded liner needs to be machined, so that the end face of the liner is smooth and flat, and is tightly attached to the end face of the connecting piece structure.
5. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: the section of the circular ring structure is in an inverted convex section structure, the middle diameter of the circular ring is smaller, and the end surfaces of the two sides of the circular ring are tightly attached to the end surface of the opaque inner container of the hydrogen storage bottle; the inner surfaces of the left and right circular rings with larger diameter are matched with the outer surface of the opaque inner container of the hydrogen storage bottle.
6. A connector for laser welding a liner of a type IV hydrogen storage bottle according to claim 5, wherein: the method comprises the steps of carrying out necking hot forming process treatment on a welding part of an inner container of the hydrogen storage bottle, clamping and fixing the inner container at a position which is a certain distance away from the end surface of the inner container, heating a region to be subjected to necking for a certain time, pushing a forming convex die to a specified position along the axial direction of the inner container, spirally folding a movable forming concave die along the radial direction of the inner container, gradually reducing the diameter of the region of the necking of the inner container until the region is completely attached to the outer surface of the forming convex die, maintaining the pressure for a certain time under certain pressure, waiting for the complete cooling of the inner container, retreating the forming concave die along the radial direction of.
7. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: the section of the circular ring structure is I-shaped, the inner surface of the outer circular ring is matched with the outer surface of the opaque inner container of the hydrogen storage bottle, and the end surfaces of two sides of the middle circular ring are tightly attached to the end surface of the opaque inner container of the hydrogen storage bottle; the outer surface of the inner ring is attached to the inner surface of the opaque inner container of the hydrogen storage bottle, and the inner ring and the middle ring simultaneously play a role in positioning the opaque inner containers of the two hydrogen storage bottles by laser welding, so that the laser welding is facilitated; the diameter size of the outer circular ring is the same as that of the opaque inner container of the hydrogen storage bottle, the outer surface of the opaque inner container of the hydrogen storage bottle after welding is flat, smooth and free of obvious bulges, and the next step of winding and processing of the fibers of the inner container of the hydrogen storage bottle is facilitated; the inner ring in the connecting piece with the I-shaped cross section structure is used as a reinforcing rib arranged in the middle of the liner.
8. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: the outer surface of the small-size circular ring and the inner surface of the opaque inner container of the hydrogen storage bottle are bonded by using an adhesive, so that the outer surfaces of the small-size circular ring at the left end and the right end are bonded with the inner surface of the opaque inner container of the hydrogen storage bottle.
9. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: and carrying out graft modification or low-temperature plasma treatment on the liner.
10. A connector for laser welding an inner liner of a type iv hydrogen storage bottle according to claim 1, wherein: and adding an absorbent into the material at the welding position of the inner container.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010922375.9A CN112025094A (en) | 2020-09-04 | 2020-09-04 | Connecting piece for laser welding of liner of IV-type hydrogen storage bottle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010922375.9A CN112025094A (en) | 2020-09-04 | 2020-09-04 | Connecting piece for laser welding of liner of IV-type hydrogen storage bottle |
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| CN112025094A true CN112025094A (en) | 2020-12-04 |
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| CN202010922375.9A Pending CN112025094A (en) | 2020-09-04 | 2020-09-04 | Connecting piece for laser welding of liner of IV-type hydrogen storage bottle |
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Application publication date: 20201204 |