IV-type hydrogen storage bottle

Abstract

The utility model discloses an IV-type hydrogen storage bottle which comprises an inner container and a valve body arranged at the position of a bottle opening of the inner container, and further comprises a rigid fixing piece, the valve body is in threaded connection with the inner side face of the rigid fixing piece, the outer side of the rigid fixing piece is attached to the inner side face of the bottle opening of the inner container, and the rigid fixing piece comprises a vertical limiting portion and an arc face limiting portion. Vertical locking grooves and transverse locking grooves are formed in the sides, attached to the inner container, of the vertical limiting part and the cambered surface limiting part, and the inner container is connected with the vertical locking grooves and the transverse locking grooves in the outer surface of the rigid fixing piece in an embedded mode. The rigid fixing part is arranged on the inner side of the inner container, the sealing part of the inner container and the rigid fixing part is arranged on the outer side of the rigid fixing part, and compared with a traditional inner sealing mode that the rigid fixing part is arranged on the outer side of the inner container or in the inner container, the outer sealing structure is adopted, so that the blow molding process for rapid production is convenient to apply; and enough strength is provided for the inner container bottle opening, and the requirement for follow-up winding layer machining is met.

Description

Technical Field

[0001] The invention relates to a type IV hydrogen gas storage cylinder, belonging to the technical field of gas storage device processing. Background Art

[0002] Hydrogen storage technology is key to the development of new energy vehicles. The development and application of traditional metal-lined Type III gas cylinders is becoming increasingly mature in my country. However, these cylinders suffer from significant drawbacks such as hydrogen embrittlement and poor fatigue performance, posing significant obstacles to their use as on-board hydrogen storage cylinders. The recent development of plastic-lined Type IV gas cylinders offers a viable approach for improving the hydrogen density, fatigue resistance, and hydrogen barrier properties of on-board gas cylinders. To improve overall rigidity, Type IV gas cylinders typically utilize metal neck technology at both ends of the plastic liner to facilitate liner fixation during the subsequent winding process. Due to the significant material differences between the metal neck and the plastic liner, the quality of the interface connection between the two becomes crucial for determining the cylinder's airtightness. Furthermore, during the cylinder's filling and deflation process, the plastic neck undergoes slight deformation, creating a gap between it and the metal neck, which can easily lead to hydrogen leakage and other problems, posing a significant safety hazard.

[0003] The existing Chinese patent CN 115405849 B is a type IV hydrogen storage cylinder end sealing structure and its preparation method. The application discloses that an inner bottle mouth and an outer bottle mouth are set at the port of the gas tank, the inner bottle mouth is processed inside the inner liner by a rotational molding process, the outer bottle mouth and the inner bottle mouth are connected by threads, and the outer bottle mouth and the outer side of the inner liner are sealed by a sealing groove processed on the outer wall of the inner liner and the bottom surface of the outer bottle mouth. The application specification proposes that the molding process of the plastic liner is selected from any one of blow molding, injection molding, rotation molding, and 3D printing molding. However, in the actual production process, the air pressure value of the blow molding process is only 0.8MPa, which only supports the blow molding of the bottle body. In the connection between plastic and metal parts, especially metal parts with groove structures, the air pressure value generated by blowing is not enough to squeeze the molten plastic and the metal parts together, resulting in a gap and a high risk of loose fitting; there is also Chinese public application CN 114060707 A fully wrapped composite gas cylinder with a plastic liner and a composite layer winding method. The metal parts in this application are set on the outer surface of the liner through a rotational molding process. Due to the difference in metal and plastic materials, the bonding degree is affected. During use, the axial force generated by the valve body installed in the metal parts during installation and removal will affect the fit between the metal parts and the liner. At the same time, the rotational molding process requires complex motion simulation and cooling. The cycle time for producing a product is about 30 minutes, which is too time-consuming and costly.

[0004] Therefore, in view of the shortcomings of the existing technology, there is an urgent need for a gas cylinder with a fast production speed and in which the connection between the metal parts and the plastic liner is not affected by different materials. Summary of the Invention

[0005] Purpose of the invention: In view of the deficiencies in the prior art, the present invention provides a Type IV hydrogen storage cylinder, which can be used in the blow molding process to improve production efficiency by arranging a rigid fixing part on the inner side of the inner liner and sealing and limiting it through vertical and horizontal stop grooves.

[0006] Technical solution: A Type IV hydrogen storage cylinder includes an inner liner and a valve body installed at the inner liner bottle mouth, and also includes a rigid fixing member arranged on the inner side of the inner liner bottle mouth. The valve body is threadedly connected to the inner side of the rigid fixing member. The rigid fixing member is trumpet-shaped and the outer side of the rigid fixing member is in contact with the inner side of the inner liner bottle mouth. The rigid fixing member includes a vertical limiter that is in contact with the vertical portion of the inner liner bottle mouth, and a curved limiter that is in contact with the transition curved portion of the inner liner bottle body near the inner liner bottle mouth. The vertical limiter and the curved limiter are integrally formed.

[0007] The vertical limiting portion and the arc surface limiting portion are both provided with vertical stop grooves and horizontal stop grooves on the side where they are in contact with the inner liner. The inner liner is embedded in the vertical stop grooves and horizontal stop grooves on the outer surface of the rigid fixing member.

[0008] The utility model provides sufficient strength for the bottle mouth of the liner by arranging the rigid fixing part on the inner side of the liner and the sealing between the liner and the rigid fixing part on the outer side of the rigid fixing part, so as to meet the processing of the subsequent winding layer. Compared with the traditional inner sealing form in which the rigid fixing part is arranged on the outer side or inside the liner, the outer seal is more suitable for the blow molding process, and an arc limit portion that fits the transition arc part is provided at the connection with the bottle mouth of the liner. During the blow molding process, the molten plastic is squeezed into the vertical stop groove and the horizontal stop groove by extrusion when the mold is closed, forming a tightly fitting embedded connection. The inner sealing form cannot be completely filled with material by mold extrusion. Compared with rotational molding, injection molding and simple blow molding, it can avoid the tightness problem caused by the air pressure value or the cavity blocking the material filling during the material flow process. At the same time, the production speed of the blow molding process is much faster than rotational molding and injection molding. The blow molding time is only 1 / 10 of that of a single gas storage cylinder made by rotational molding and injection molding. The use of the outer sealing structure is convenient for application in the blow molding process of rapid production.

[0009] The vertical stop groove includes at least one vertical stop ring groove respectively arranged around the outer sides of the vertical limiting portion and the arc surface limiting portion, and the angle between the vertical stop ring groove and the vertical direction is greater than 0°.

[0010] By setting up a vertical stop ring groove, the rigid fixing parts after processing and installation have a vertical tensile resistance function. When pulling upward or pressing downward, the combination of the inner liner and the vertical stop ring groove can make the rigid fixing parts stably installed without displacement, and at the same time can achieve a sealing effect through the tightly filled plastic.

[0011] The transverse stopping groove includes at least one transverse stopping vertical groove longitudinally arranged outside the vertical limiting portion and the arc surface limiting portion respectively, and the angle between the transverse stopping vertical groove and the vertical stopping ring groove is greater than 0°.

[0012] By setting up a transverse stop groove, the rigid fixing parts after processing and installation have a transverse tensile resistance function. When rotating left and right, the combination of the inner liner and the transverse stop groove can make the rigid fixing parts stably installed without displacement, and at the same time can achieve a sealing effect through the tightly filled plastic.

[0013] The vertical stop ring groove is arranged horizontally, and the horizontal stop vertical groove is arranged vertically.

[0014] In order to improve the stopping effect of the vertical stop ring groove and the horizontal stop groove, and to facilitate processing, they are set horizontally and vertically respectively, which is more convenient in the grooving process of rigid fixing parts production. At the same time, the horizontal and vertical grooves have better stopping effect, and the probability of deviation is extremely small, so the sealing can be guaranteed.

[0015] The number of the vertical stop ring grooves arranged on the vertical limit portion is 2 to 4, the number of the vertical stop ring groove arranged on the arc surface limit portion is 1, and the horizontal stop vertical grooves are symmetrically arranged 2 to 4 along the circumferential direction of the rigid fixing part.

[0016] In order to improve the stopping effect and sealing, multiple vertical stop ring grooves are set. Due to limited space and to ensure that the thickness of the plastic filled in each vertical stop ring groove has sufficient strength, 2 to 4 vertical stop ring grooves with the same groove spacing are set to ensure the stopping effect and improve the sealing of the connection; since there is an arc-shaped contact surface between the arc limit part and the inner liner, its own structure has upward tensile strength, so in order to ensure airtightness, only one vertical stop ring groove is required, and the structure itself and the vertical stop ring groove can realize the combined functions of sealing and stopping; to prevent the single groove from having insufficient anti-rotation strength, multiple horizontal stop vertical grooves are set and combined for stopping, and the grooves are filled with plastic by extrusion molding to achieve sealing.

[0017] The middle part of the valve body is provided with a connection part which is threadedly connected to the inner side surface of the rigid fixing part. The edge of the valve body is provided with a sealing part extending toward the inner liner. The inner side surface of the sealing part is provided with at least one sealing groove. A rubber sealing ring is provided in the sealing groove. The outer side surface of the inner liner bottle mouth is provided with a smooth surface. After installation, the rubber sealing ring is interference fit with the outer side surface of the inner liner bottle mouth.

[0018] By polishing the outer side of the inner tank to a smoothness of 1.6 and then installing the valve port, the rubber sealing ring in the valve port is squeezed and fitted with the polished smooth surface. The rubber sealing ring is squeezed and deformed to provide auxiliary sealing.

[0019] Beneficial effect: The utility model arranges the rigid fixing part on the inner side of the inner liner, and arranges the seal between the inner liner and the rigid fixing part on the outside of the rigid fixing part. Compared with the traditional internal sealing form in which the rigid fixing part is arranged on the outside or inside of the inner liner, the external seal is more suitable for the blow molding process, and an arc limit portion that fits the transition arc part is provided at the connection with the bottle mouth of the inner liner. During the blow molding process, the molten plastic is squeezed into the vertical stop groove and the horizontal stop groove through the extrusion when the mold is closed, forming a tightly fitting embedded connection. The external sealing structure is convenient for application in the blow molding process of rapid production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 This is a cross-sectional view of the gas storage tank of the utility model.

[0022] Figure 2 This is a side view of the rigid fixing member of the utility model.

[0023] Figure 3 This is the axonometric drawing of the rigid fixing part of the utility model.

[0024] Figure 4 This is a structural diagram of the connection between the valve body and the inner tank of the utility model. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] like Figure 1 and 2 As shown, a Type IV hydrogen storage cylinder includes an inner liner 1 and a valve body 2 installed at the bottle mouth of the inner liner 1, and also includes a rigid fixing member 3 provided on the inner side of the bottle mouth of the inner liner 1. The valve body 2 is threadedly connected to the inner side of the rigid fixing member 3. The rigid fixing member 3 is trumpet-shaped and the outer side of the rigid fixing member 3 is in contact with the inner side of the bottle mouth of the inner liner 1. The rigid fixing member 3 includes a vertical limiting portion 31 that is in contact with the vertical portion of the bottle mouth of the inner liner 1, and a curved limiting portion 32 that is in contact with the transition curved portion of the inner liner 1 body near the bottle mouth of the inner liner 1. The vertical limiting portion 31 and the curved limiting portion 32 are integrally formed;

[0029] The vertical limiting portion 31 and the arc limiting portion 32 are both provided with vertical and horizontal stop grooves on the side in contact with the inner liner 1 , and the inner liner 1 is embedded in the vertical and horizontal stop grooves on the outer surface of the rigid fixing member 3 .

[0030] The utility model arranges the rigid fixing part 3 on the inner side of the inner liner 1, and the seal between the inner liner 1 and the rigid fixing part 3 is arranged on the outer side of the rigid fixing part 3, which provides sufficient strength for the bottle mouth of the inner liner 1 to meet the processing of the subsequent winding layer. Compared with the traditional internal sealing form in which the rigid fixing part 3 is arranged on the outer side or inside the inner liner 1, the external seal is more suitable for the blow molding process, and an arc limit portion 32 that fits the transition arc part is provided at the connection with the bottle mouth of the inner liner 1. During the blow molding process, the molten plastic is squeezed into the vertical stop groove and the horizontal stop groove by extrusion when the mold is closed, forming a tightly fitting embedded connection. The internal sealing form cannot be completely filled with material by mold extrusion. Compared with rotational molding, injection molding and simple blow molding, it can avoid the tightness problem caused by the air pressure value or the cavity blocking the material filling during the material flow process. At the same time, the production speed of the blow molding process is much faster than rotational molding and injection molding. The blow molding time is only 1 / 10 of that of a single gas storage cylinder made by rotational molding and injection molding. The use of an external sealing structure is convenient for application in the blow molding process of rapid production.

[0031] The vertical stop groove includes at least one vertical stop ring groove 33 respectively arranged around the outer side of the vertical limiting portion 31 and the arc surface limiting portion 32. The angle between the vertical stop ring groove 33 and the vertical direction is greater than 0°, and in this embodiment, it is selected to be 90°.

[0032] By providing a vertical stop ring groove 33, the rigid fixing part 3 after processing and installation has a vertical tensile resistance function. When pulling upward or pressing downward, the combination of the inner liner 1 and the vertical stop ring groove 33 can enable the rigid fixing part 3 to be stably installed without displacement, and at the same time, a sealing effect can be achieved through the tightly filled plastic.

[0033] The transverse stop groove includes at least one transverse stop vertical groove 34 longitudinally arranged on the outside of the vertical limit portion 31 and the arc limit portion 32, respectively. The angle between the transverse stop vertical groove 34 and the vertical stop ring groove 33 is greater than 0°, and is selected to be 90° in this embodiment.

[0034] By providing a transverse stop groove 34, the rigid fixing part 3 after processing and installation has a transverse tensile resistance function. When rotating left and right, the combination of the inner liner 1 and the transverse stop groove 34 can make the rigid fixing part 3 stably installed without displacement, and at the same time can achieve a sealing effect through the tightly filled plastic.

[0035] The vertical retaining ring groove 33 is arranged horizontally, and the transverse retaining vertical groove 34 is arranged vertically.

[0036] In order to improve the stopping effect of the vertical stop ring groove 33 and the horizontal stop vertical groove 34, and for the convenience of processing, they are set horizontally and vertically respectively, which is more convenient in the production and grooving process of the rigid fixing part 3. At the same time, the horizontal and vertical grooves have better stopping effect, and the probability of deviation is extremely small, so the sealing can be guaranteed.

[0037] like Figure 2 and 3 As shown, the number of the vertical stop ring grooves 33 arranged on the vertical limit portion 31 is 2 to 4, and is set to 4 in this embodiment. The number of the vertical stop ring grooves 33 arranged on the arc surface limit portion 32 is 1, and the horizontal stop vertical grooves 34 are symmetrically arranged 2 to 4 along the circumferential direction of the rigid fixing member 3, and is set to 4 in this embodiment.

[0038] In order to improve the stopping effect and sealing, a plurality of vertical stop ring grooves 33 are set. Due to limited space and to ensure that the thickness of the plastic filled in each vertical stop ring groove 33 has sufficient strength, 2 to 4 vertical stop ring grooves 33 with the same groove spacing are set to ensure the stopping effect and improve the sealing of the connection; since the arc surface limiting portion 32 has an arc-shaped contact surface with the inner liner 1, its own structure has the ability to resist upward tension, so in order to ensure airtightness, only one vertical stop ring groove 33 is required, and the structure itself and the vertical stop ring groove 33 can achieve the combined functions of sealing and stopping; to prevent the single groove from having insufficient anti-rotation strength, a plurality of horizontal stop vertical grooves 34 are set and combined for stopping, and the grooves are filled with plastic by extrusion molding to achieve sealing.

[0039] like Figure 4 As shown, a connecting portion 21 is provided in the middle of the valve body 2, which is threadedly connected to the inner side of the rigid fixing member 3. An air outlet is provided on the upper side of the valve body 2. A sealing portion 22 is provided on the edge of the valve body 2 extending toward the inner liner 1. At least one sealing groove 23 is provided on the inner side of the sealing portion 22. A rubber sealing ring 24 is provided in the sealing groove 23. The outer side surface of the bottle mouth of the inner liner 1 is set as a smooth surface. After installation, the rubber sealing ring 24 is interference fit with the outer side surface of the bottle mouth of the inner liner 1.

[0040] By polishing the outer side of the inner tank 1 to a smoothness of 1.6, and then installing the valve port, the rubber sealing ring 24 in the valve port is squeezed and fitted with the polished smooth surface, and the rubber sealing ring 24 is squeezed and deformed to perform auxiliary sealing.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0042] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A type IV hydrogen storage cylinder, comprising an inner liner (1) and a valve body (2) mounted at the mouth of the inner liner (1), characterized in that: The invention also includes a rigid fixing member (3) arranged on the inner side of the bottle mouth of the liner (1), the valve body (2) is threadedly connected to the inner side of the rigid fixing member (3), the rigid fixing member (3) is trumpet-shaped, and the outer side of the rigid fixing member (3) is in contact with the inner side of the bottle mouth of the liner (1), the rigid fixing member (3) includes a vertical limiting portion (31) in contact with the vertical portion of the bottle mouth of the liner (1), and an arc-shaped limiting portion (32) in contact with the transition arc-shaped portion of the bottle body of the liner (1) close to the bottle mouth of the liner (1), and the vertical limiting portion (31) and the arc-shaped limiting portion (32) are integrally formed; The vertical limiting portion (31) and the arc surface limiting portion (32) are both provided with a vertical stop groove and a horizontal stop groove on the side where they are in contact with the inner liner (1). The inner liner (1) is embedded in the vertical stop groove and the horizontal stop groove on the outer surface of the rigid fixing member (3).

2. The type IV hydrogen storage cylinder according to claim 1, characterized in that: The vertical stop groove comprises at least one vertical stop ring groove (33) respectively arranged around the outside of the vertical limiting portion (31) and the arc surface limiting portion (32), and the included angle between the vertical stop ring groove (33) and the vertical direction is greater than 0°.

3. The type IV hydrogen storage cylinder according to claim 2, characterized in that: The transverse stop groove comprises at least one transverse stop vertical groove (34) longitudinally arranged outside the vertical limit portion (31) and the arc surface limit portion (32), respectively. The included angle between the transverse stop vertical groove (34) and the vertical stop ring groove (33) is greater than 0°.

4. The type IV hydrogen storage cylinder according to claim 3, characterized in that: The vertical stop ring groove (33) is arranged horizontally, and the transverse stop vertical groove (34) is arranged vertically.

5. The type IV hydrogen storage cylinder according to claim 4, characterized in that: The number of the vertical stop ring grooves (33) provided on the vertical limiting portion (31) is 2 to 4, the number of the vertical stop ring groove (33) provided on the arc surface limiting portion (32) is 1, and the number of the horizontal stop vertical grooves (34) is symmetrically provided along the circumferential direction of the rigid fixing member (3).

6. The type IV hydrogen storage cylinder according to claim 1, characterized in that: A connecting portion (21) is provided in the middle of the valve body (2) and is threadedly connected to the inner side surface of the rigid fixing member (3). A sealing portion (22) is provided on the edge of the valve body (2) extending toward the inner liner (1). At least one sealing groove (23) is provided on the inner side surface of the sealing portion (22). A rubber sealing ring (24) is provided in the sealing groove (23). The outer side surface of the bottle mouth of the inner liner (1) is provided as a smooth surface. After installation, the rubber sealing ring (24) is interference-fitted with the outer side surface of the bottle mouth of the inner liner (1).

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