Hydrogen spherical tank and gas inlet and outlet device thereof

Abstract

According to the scheme, the hydrogen spherical tank comprises a flange cover arranged on a manhole in the top of a spherical tank shell, and at least one mounting through hole is formed in the flange cover; the outer periphery of the connecting convex ring is arranged on the inner periphery of the mounting through hole in a sealing manner; the at least one connecting pipe structure is arranged corresponding to the connecting convex ring, the interior of the connecting pipe structure is hollow, and the periphery of one axial end of the connecting pipe structure is connected to the inner periphery of the connecting convex ring, so that the connecting pipe structure is fixed on the flange cover through the connecting convex ring; the connecting pipe structures are placed on the flange cover of the manhole in a centralized mode, the interiors of the connecting pipe structures communicate with the inner cavity of the spherical tank shell through the flange cover, the flowing path of a medium in the spherical tank shell is optimized, holes and joints in the spherical tank shell are reduced, the service life of the spherical tank shell is prolonged, and the service life of the spherical tank shell is prolonged. The connecting stress of the connecting pipe structure and the flange cover is reduced, the safety and structural integrity of the spherical tank are improved, and the leakage risk is reduced.

Description

Technical Field

[0001] This application relates to the field of spherical tanks, and particularly to a hydrogen spherical tank and its air inlet and outlet device. Background Art

[0002] Spherical tanks are widely used for storing and transporting gases. In the existing design of hydrogen spherical tanks, the situation where high pressure and fatigue working conditions coexist often occurs. Therefore, quenched and tempered high-strength steel is often used as the main material for the pressure-bearing spherical tank shell. In a conventional spherical tank, the nozzles that can be used for inlet and outlet of the tank are generally dispersedly arranged in various parts of the spherical shell. However, if holes are dispersedly opened on the pressure-bearing shell of the spherical tank, it is not only unfavorable for the smooth flow of gas, thus reducing the gas flow efficiency, but also in order to ensure the material compatibility of the nozzle and the spherical tank shell during welding, the nozzle needs to be made of high-carbon steel with the same type of quenching and tempering as the spherical tank shell material, which increases the complexity of the welding process, and is also prone to stress concentration at multiple welds, resulting in sudden changes in the structural shape and increasing the risk of gas leakage. Summary of the Utility Model

[0003] In order to solve the above problems, this application provides a hydrogen spherical tank and its air inlet and outlet device that reduce the number of holes in the spherical tank shell, simplify the welding process, and reduce the sudden change in the structure of the spherical tank shell.

[0004] According to one aspect of the embodiments of this application, an air inlet and outlet device for a hydrogen spherical tank is disclosed. The air inlet and outlet device of the hydrogen spherical tank includes a flange cover, which is arranged on the manhole at the top of the spherical tank shell, and at least one installation through-hole is provided on the flange cover; a connecting convex ring, the outer periphery of the connecting convex ring is hermetically arranged on the inner periphery of the installation through-hole; at least one nozzle structure, which is correspondingly arranged with the connecting convex ring, the inside of the nozzle structure is through, and one axial end outer periphery of the nozzle structure is connected to the inner periphery of the connecting convex ring, so that the nozzle structure is fixed on the flange cover through the connecting convex ring; the other end of the nozzle structure extends upward out of the flange cover.

[0005] In an exemplary embodiment, the outer peripheral wall of the connecting convex ring protrudes outward circumferentially; the inner peripheral wall of the installation through-hole protrudes inward circumferentially, and the protruding part of the connecting convex ring is directly opposite to the protruding part on the installation through-hole; an annular welding gap is jointly formed between the outer peripheral wall of the connecting convex ring and the inner peripheral wall of the installation through-hole, and the connecting convex ring is welded to the inner peripheral wall of the installation through-hole along the welding gap.

[0006] In an exemplary embodiment, the outer peripheral wall of the connecting convex ring includes a first inner inclined surface, a first transition surface, and a first outer inclined surface that are successively connected axially upward; the inner peripheral wall of the mounting through hole includes a second inner inclined surface, a second transition surface, and a second outer inclined surface that are successively connected axially upward; the first inner inclined surface and the second inner inclined surface form a first included angle that faces the spherical tank shell; the first transition surface and the second transition surface are spaced opposite each other; the first outer inclined surface and the second outer inclined surface form a second included angle that faces away from the spherical tank shell.

[0007] In an exemplary embodiment, the distance between the first transition surface and the second transition surface is 1 mm to 3 mm; the angle of the first included angle is 50° to 55°; the angle of the second included angle is 45° to 50°.

[0008] In an exemplary embodiment, the axial dimension of the connecting convex ring matches the axial length of the mounting through hole; the lower side surface of the connecting convex ring in the axial direction and the lower port of the mounting through hole in the axial direction are flush with each other; the lower side surface of the connecting convex ring in the axial direction and the lower end surface of the connecting pipe structure in the axial direction are flush with each other.

[0009] In an exemplary embodiment, the upper side surface of the connecting convex ring facing away from the spherical tank shell is an inclined surface, so that the axial dimension of the connecting convex ring gradually increases in the radial direction toward the axis.

[0010] In an exemplary embodiment, the axial included angle between the inclined surface and the connecting pipe structure is 40° to 50°; and / or the upper end of the inclined surface is arc-shaped, and the arc-shaped part of the inclined surface is tangent to the outer peripheral wall of the connecting pipe structure.

[0011] In an exemplary embodiment, there are a plurality of mounting through holes, and the plurality of mounting through holes are circumferentially distributed at intervals around the center of the flange cover; there are a plurality of connecting pipe structures, and the connecting pipe structures are respectively arranged on the mounting through holes through the connecting convex rings one by one.

[0012] In an exemplary embodiment, the connecting pipe structure and the connecting convex ring are integrally formed; a connecting flange is circumferentially provided at one end of the connecting pipe structure away from the connecting convex ring.

[0013] In an exemplary embodiment, the flange cover includes a cylinder body and a cover body. One end of the cylinder body is open and sleeved on the manhole at the top of the spherical tank shell. The cover body is detachably connected to the bottom edge of the cylinder body. The cover body is configured to cover or open the other end opening of the cylinder body. The installation through hole is provided on the cover body. One side of the cover body is rotatably connected to the cylinder body, and the other side is connected to the cylinder body by bolts. A handle is provided on the cover body, and the installation through hole is located between the handle and the rotatable connection position of the cover body. A sealing ring is provided at the position where the cylinder body and the cover body are mutually covered.

[0014] The present application also discloses a hydrogen spherical tank, which includes the air inlet and outlet device of the hydrogen spherical tank as described above, and further includes: a spherical tank shell, a manhole is provided on the top of the spherical tank shell, and the flange cover is arranged on the manhole and can seal the manhole.

[0015] The technical solutions provided by the embodiments of the present application at least include the following beneficial effects:

[0016] In the present application, the nozzle structure is centrally placed on the flange cover on the manhole at the top of the spherical tank shell. The inside of the nozzle structure is communicated with the inner cavity of the spherical tank shell through the flange cover, which not only optimizes the flow path of the medium inside the spherical tank shell, but also reduces the number of openings and seams on the spherical tank shell. Among them, a connecting convex ring is provided on the outer periphery of the nozzle structure, and the outer peripheral wall of the connecting convex ring is correspondingly sealed on the inner peripheral wall of the installation through hole, so that the nozzle structure can be connected to the flange cover through the connecting convex ring, which can not only improve the installation strength of the nozzle structure, but also reduce the connection stress between the nozzle structure and the flange cover, significantly improving the safety and structural integrity of the spherical tank, reducing the overall leakage risk, improving the manufacturing efficiency and safety, and facilitating the connection and fixation of the nozzle structure and the flange cover, thereby improving the production efficiency.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0019] Figure 1 It is a schematic diagram of the composition of the spherical tank provided by an embodiment of the present application;

[0020] Figure 2 It is a partial cross-sectional view of the connection position between the nozzle structure, the connecting convex ring and the flange cover provided by an embodiment of the present application;

[0021] Figure 3 It is a partial enlarged view of the cross-sectional view of the flange cover along the installation through hole provided by an embodiment of the present application;

[0022] Figure 4 Half-sectional view of the connection between the connecting collar and the nozzle structure provided by an embodiment of the present application;

[0023] Figure 5 Sealed connection structure diagram between the connecting collar and the flange cover provided by an embodiment of the present application;

[0024] Figure 6 Distribution diagram of multiple nozzle structures on the flange cover provided by an embodiment of the present application.

[0025] Explanation of the reference numerals is as follows: 1 - spherical tank shell, 2 - flange cover, 21 - mounting through-hole, 211 - second inner inclined surface, 212 - second transition surface, 213 - second outer inclined surface, 22 - cylinder body, 23 - cover body, 24 - handle, 25 - sealing ring, 26 - welding seam, α - first included angle, β - second included angle, 3 - connecting collar, 31 - first inner inclined surface, 32 - first transition surface, 33 - first outer inclined surface, 34 - inclined surface, 4 - nozzle structure, 41 - connecting flange. Detailed implementation manners

[0026] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these exemplary embodiments are provided so that the description of the present application will be more complete and comprehensive, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art.

[0027] In the description of the present utility model, all the connection relationships mentioned do not simply refer to the direct connection of components, but rather refer to the possibility of forming a more optimal connection structure by adding or reducing connection accessories according to specific implementation situations. Each technical feature in the present utility model can be interactively combined on the premise of not conflicting with each other.

[0028] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", and "connected" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present utility model.

[0030] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, while understandings such as "above", "below", "within", etc. include the corresponding number.

[0031] The present application provides an air inlet and outlet device for a hydrogen balloon tank, which adopts a structure that the connecting pipe structures 4 are centrally arranged on the flange cover 2 installed on the manhole at the top of the tank shell 1, reducing the number of openings and seams on the tank shell 1 and improving the safety and structural integrity of the balloon tank.

[0032] Refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a structural diagram of the balloon tank of the present utility model, Figure 2 is a partial cross-sectional view of the connection position between the connecting pipe structure 4, the connecting convex ring 3 and the flange cover 2 of the present utility model, Figure 3 is a partial enlarged view of the cross-sectional view of the flange cover 2 along the installation through hole 21 of the present utility model. The hydrogen balloon tank of the present application includes a tank shell 1 and an air inlet and outlet device for the hydrogen balloon tank. Among them, the air inlet and outlet device for the hydrogen balloon tank includes a flange cover 2, a connecting convex ring 3 and at least one connecting pipe structure 4. A manhole is provided at the top of the tank shell 1, and the flange cover 2 is arranged on the manhole and can seal the manhole. At least one installation through hole 21 is provided on the flange cover 2. At least one connecting convex ring 3 is provided, and the connecting convex ring 3 is arranged in one-to-one correspondence with the installation through hole 21. The outer periphery of the connecting convex ring 3 is hermetically arranged on the inner periphery of the installation through hole 21. The connecting pipe structure 4 is arranged in one-to-one correspondence with the connecting convex ring 3, and the inside of the connecting pipe structure 4 is through. One axial end of the connecting pipe structure 4 is connected to the inner periphery of the connecting convex ring 3 on the outer periphery, so that the connecting pipe structure 4 is fixed on the flange cover 2 through the connecting convex ring 3; the other end of the connecting pipe structure 4 extends upward from the flange cover 2 in a direction away from the tank shell 1.

[0033] Specifically, the inner cavity of the spherical tank shell 1 is connected to the nozzle structure 4, thereby enabling the input, output, and discharge of the medium inside the spherical tank shell 1 or serving as a safety valve port. In the present utility model, the nozzle structure 4 is centrally placed on the flange cover 2 of the manhole, such that the inside of the nozzle structure 4 is connected to the inner cavity of the spherical tank shell 1 through the flange cover 2, and the input and output paths of the medium are restricted to the flange cover 2. This not only optimizes the flow path of the medium inside the spherical tank shell 1 but also reduces the number of openings and seams on the spherical tank shell 1. Among them, a connecting convex ring 3 is provided on the outer periphery of the nozzle structure 4, and the outer peripheral wall of the connecting convex ring 3 is correspondingly sealed on the inner peripheral wall of the mounting through-hole 21, so that the nozzle structure 4 can be connected to the flange cover 2 through the connecting convex ring 3. The connecting convex ring 3 can be regarded as thickening the structure of the nozzle structure 4 corresponding to the connecting flange cover 2. This not only improves the installation strength of the nozzle structure 4 but also reduces the connection stress between the nozzle structure 4 and the flange cover 2, significantly enhancing the safety and structural integrity of the spherical tank, overall reducing the leakage risk, improving the manufacturing efficiency and safety, reducing the stress concentration caused by structural mutations, and enabling the nozzle structure 4 to better adapt to the metal fatigue caused by multiple pressure cycles formed during the use of the spherical tank shell 1. Moreover, it facilitates the connection and fixation of the nozzle structure 4 and the flange cover 2, improving the production efficiency.

[0034] It should be noted that in this solution, the nozzle structure 4 is not directly welded to the spherical tank shell 1. There is no need to select the same type of quenched and tempered high-strength steel for both in order to improve the material compatibility between the nozzle structure 4 and the spherical tank shell 1 during welding, thus avoiding the decline in the ability of the nozzle structure 4 to adapt to the fatigue environment. In this application, the flange cover 2 and the nozzle structure 4 can be made of steel with stronger anti-fatigue ability. This not only ensures the integrity of the pressure-bearing shell of the spherical tank and avoids stress concentration caused by structural mutations but also enables the nozzle structure 4 to overcome the metal fatigue caused by multiple pressure cycles of the spherical tank shell 1.

[0035] The spherical tank of this application is used to store hydrogen, and the manhole is arranged at the top of the spherical tank shell 1 to facilitate the flow of hydrogen in the gaseous state. In addition, corresponding to the case where the spherical tank is used to store liquid media, the manhole can be arranged at the bottom of the spherical tank shell 1 to facilitate the collection and output of the liquid media. Considering that high pressure and fatigue conditions often coexist during the use of the spherical tank, specifically, the spherical tank shell 1 can be made of quenched and tempered high-strength steel with strong pressure-bearing capacity, and the materials of the nozzle structure 4 and the flange cover 2 can be 20MnMoD.

[0036] Furthermore, the mounting through-hole 21 on the flange cover 2 can be provided with one, two or more. In the case of multiple mounting through-holes 21, the mounting through-holes 21 are circumferentially distributed at intervals around the center of the flange cover 2 to facilitate the connection of the connecting convex ring 3. The number and positions of the nozzle structure 4, the connecting convex ring 3, and the mounting through-hole 21 are set in one-to-one correspondence.

[0037] Combination Figure 2 The inner peripheral wall of the mounting through hole 21 protrudes inward in the circumferential direction, and the outer peripheral wall of the connecting convex ring 3 protrudes outward in the circumferential direction; the protruding part of the connecting convex ring 3 faces the protruding part on the mounting through hole 21; an annular welding gap 26 is jointly formed between the outer peripheral wall of the connecting convex ring 3 and the inner peripheral wall of the mounting through hole 21, and the connecting convex ring 3 is welded to the inner peripheral wall of the mounting through hole 21 along the welding gap 26.

[0038] Specifically, the inner peripheral wall of the mounting through hole 21 is spaced from the connecting convex ring 3, and the circumferential protrusions on the inner peripheral wall of the mounting through hole 21 face the circumferential protrusions of the connecting convex ring 3, so that an annular welding gap 26 is formed between the inner peripheral wall of the mounting through hole 21 and the outer peripheral wall of the connecting convex ring 3. The welding gap 26 is narrowed corresponding to the protruding positions of the connecting convex ring 3 and the mounting through hole 21, facilitating the welding of the solder, so that the outer circumference of the connecting convex ring 3 can be welded to the inner peripheral wall of the mounting through hole 21. In the present application, a sealed connection is formed between the connecting convex ring 3 and the flange cover 2 by welding.

[0039] In the present application, the inner peripheral wall of the mounting through hole 21 protrudes in a circumferential direction along the middle slot of the axis towards the axis, and the outer peripheral wall of the connecting convex ring 3 protrudes in a circumferential direction along the middle of the axis away from the axis, so that the opening distance at both ends of the welding gap 26 is larger and the middle is narrowed, facilitating welding at the openings at both ends of the welding gap 26 and improving the welding effect. Moreover, the axial direction of the connecting convex ring 3, the axial direction of the mounting through hole 21, and the axial direction of the annular welding gap 26 coincide, so that the gap distance in the annular welding gap 26 is consistent. In fact, the axial directions of the connecting convex ring 3, the mounting through hole 21, and the welding gap 26 all pass through the inside of the spherical tank shell 1. In addition, the welding gap 26 formed between the outer peripheral wall of the connecting convex ring 3 and the inner peripheral wall of the mounting through hole 21 can also have a consistent spacing. The protruding positions of the outer peripheral wall of the connecting convex ring 3 and the inner peripheral wall of the mounting through hole 21 are both on the side close to the spherical tank shell 1 in the axial direction, that is, the lower end of the outer peripheral wall of the connecting convex ring 3 and the lower end of the inner peripheral wall of the mounting through hole 21, or both are on the side away from the spherical tank shell 1 in the axial direction, that is, the upper end of the outer peripheral wall of the connecting convex ring 3 and the upper end of the inner peripheral wall of the mounting through hole 21, so that the welding gap 26 forms a structure with one end narrowed in the axial direction.

[0040] Such as Figure 2As shown, the flange cover 2 includes a cylinder body 22 and a cover body 23. One end of the cylinder body 22 is open and sleeved on the manhole, and the cover body 23 is detachably connected to the bottom edge of the cylinder body 22. The cover body 23 is configured to cover or open the other end opening of the cylinder body 22, and an installation through-hole 21 is provided on the cover body 23. The inside of the cylinder body 22 is through, and the two axial ends inside the cylinder body 22 are respectively communicated with the through inside of the installation through-hole 21 and the inner cavity of the spherical tank shell 1, so that the installation through-hole 21 on the cover body 23 faces the space enclosed by the cylinder body 22, facilitating the medium to enter and exit the spherical tank shell 1 through the connecting pipe structure 4 on the installation through-hole 21.

[0041] Further, one side of the cover body 23 is rotatably connected to the cylinder body 22, and the other side is connected to the cylinder body 22 by bolts; a handle 24 is provided on the cover body 23, and the installation through-hole 21 is located between the handle 24 and the rotatable connection position of the cover body 23. The staff can flip the cover body 23 through the handle 24 to open or cover the cylinder body 22, which is convenient for operation. Moreover, a sealing ring 25 is provided at the position where the cylinder body 22 and the cover body 23 are mutually covered. The sealing performance between the cover body 23 and the cylinder body 22 is improved to avoid gas medium leakage. In some other embodiments, the cover body 23 can also be circumferentially connected to the cylinder body 22 by bolts, and the cover body 23 and the cylinder body 22 are opened or closed by removing or installing bolts.

[0042] Further, in combination with Figure 3 , the inner peripheral wall of the installation through-hole 21 includes a second inner inclined surface 211, a second transition surface 212, and a second outer inclined surface 213 that are sequentially connected along the axial direction and face away from the spherical tank shell 1 upward. In combination with Figure 4 , the outer peripheral wall of the connecting convex ring 3 includes a first inner inclined surface 31, a first transition surface 32, and a first outer inclined surface 33 that are sequentially connected along the axial direction and face away from the spherical tank shell 1 upward. In combination with Figure 5 , the first inner inclined surface 31 and the second inner inclined surface 211 form a first included angle α, and the first included angle α faces the spherical tank shell 1 upward; the first transition surface 32 and the second transition surface 212 are spaced opposite to each other; the first outer inclined surface 33 and the second outer inclined surface 213 form a second included angle β, and the second included angle β faces away from the spherical tank shell 1 downward.

[0043] Specifically, the first included angle α between the second inner inclined surface 211 and the first inner inclined surface 31 faces upward towards the spherical tank shell 1, and the second included angle β between the second outer inclined surface 213 and the second outer inclined surface 213 faces downward away from the spherical tank shell 1. Workers can perform welding at the positions of the welding seam 26 corresponding to the first included angle α and the second included angle β. The existence of the first included angle α and the second included angle β can optimize the welding process, ensure the quality and strength of the welding position, and make it easier for the solder to penetrate into the welding seam 26. In fact, the first included angle α is formed on the circumference at one axial end of the welding seam 26, and the second included angle β is formed on the circumference at the other axial end of the welding seam 26, ensuring that the connecting convex ring 3 can be circumferentially welded to the installation through-hole 21. In fact, the first inner inclined surface 31, the second inner inclined surface 211, the first transition surface 32, the second transition surface 212, the first outer inclined surface 33, and the second outer inclined surface 213 are all annular surface structures.

[0044] In this embodiment, the distance between the first transition surface 32 and the second transition surface 212 is 1 mm to 3 mm; the angle of the first included angle α is 50° to 55°; the angle of the second included angle β is 45° to 50°. Specifically, the first included angle α is set to be slightly larger than the second included angle β, so that the welding depth at the end of the welding seam 26 facing the inner cavity of the spherical tank shell 1 is deeper, ensuring the welding quality and improving the fixing effect between the connecting convex ring 3 and the flange cover 2. In addition, the distance between the first transition surface 32 and the second transition surface 212 is determined to be 1 mm to 3 mm ， To avoid false soldering.

[0045] The connecting convex ring 3 is formed on the circumferential side of the pipe connection structure 4 near one end of the spherical tank shell 1. In this embodiment, the connecting convex ring 3 and the pipe connection structure 4 are integrally formed, and can be specifically obtained through processes such as die forming and machine tool cutting and milling. This ensures the connection strength and sealing performance between the connecting convex ring 3 part and the pipe connection structure 4 part, reduces the stress mutation between the connecting convex ring 3 and the pipe connection structure 4. The connecting convex ring 3 can be regarded as thickening the structure of the pipe connection structure 4 corresponding to the connecting flange 41 cover 2, improving the installation strength of the pipe connection structure 4, and at the same time reducing the connection stress between the pipe connection structure 4 and the flange cover 2. In addition, the connecting convex ring 3 and the pipe connection structure 4 can also be connected and fixed by welding or other means.

[0046] Refer to Figure 5 , the axial dimension of the connecting convex ring 3 matches the axial length of the installation through-hole 21; the side surface of the connecting convex ring 3 axially close to the spherical tank shell 1 and the port of the installation through-hole 21 axially close to the spherical tank shell 1 are flush with each other. The bottom of this integral section pipe realizes the internal and external flush docking with the surface of the manhole flange cover 2, and through welding, it ensures the smooth transition of the welding joint in the welding seam 26, effectively reducing the fatigue damage and stress concentration caused by pressure fluctuations.

[0047] Moreover, the connecting convex ring 3 is flush with the side of the spherical tank shell 1 along the axial direction, and the end face of the connecting pipe structure 4 is flush with the spherical tank shell 1 along the axial direction. The connecting pipe structure 4 and the connecting convex ring 3 are flush with each other on the side facing the spherical tank shell 1, which is convenient for the flow of the medium. Moreover, it is also convenient for the integral molding of the connecting convex ring 3 and the connecting pipe structure 4.

[0048] In this embodiment, one side of the connecting convex ring 3 facing away from the spherical tank shell 1 is an inclined surface 34, so that the axial dimension of the connecting convex ring 3 gradually increases in the radial direction close to the axis. Specifically, the axial thickness of the connecting convex ring 3 gradually increases in the direction of approaching the central axis of the connecting convex ring 3 radially, which increases the connection area between the connecting convex ring 3 and the connecting pipe structure 4, further improves the strength of the connection position between the connecting convex ring 3 and the connecting pipe structure 4, reduces the generation of stress concentration and cracks, and improves the anti-fatigue ability of the connecting pipe structure 4. In addition, when stress concentration is ignored, the back of the connecting convex ring 3 facing away from the spherical tank shell 1 can also be perpendicular to the outer peripheral wall of the connecting pipe structure 4.

[0049] Furthermore, the axial included angle between the inclined surface 34 and the connecting pipe structure 4 is 40° to 50°. The strength of the connection position between the connecting convex ring 3 and the connecting pipe structure 4 is further improved.

[0050] In this embodiment, the position of the inclined surface 34 away from the spherical tank shell 1 is arc-shaped, and the arc-shaped part of the inclined surface 34 is tangent to the outer peripheral wall of the connecting pipe structure 4. The inclined surface 34 is connected to the outer peripheral wall of the connecting pipe structure 4 through an arc surface, so that the stress distribution is more uniform, further reducing the deformation and cracking phenomenon caused by stress concentration between the connecting convex ring 3 and the connecting pipe structure 4, and improving the strength of the connection position between the connecting convex ring 3 and the connecting pipe structure 4. In fact, the inclined surface 34 can be a plane, an arc surface, or a combined surface structure of a plane and an arc surface, as long as the connecting convex ring 3 is integrally formed into a shape with a smaller axial thickness on the outer periphery and a larger axial thickness in the direction close to the axis.

[0051] Combined Figure 6 , there are multiple mounting through holes 21, and the multiple mounting through holes 21 are circumferentially distributed at intervals around the center of the cover body 23. There are multiple connecting pipe structures 4, and the connecting pipe structures 4 are arranged on the mounting through holes 21 one by one through the connecting convex rings 3. In fact, the outer diameter of the connecting pipe structure 4 can be determined according to its use function, and the sizes of the corresponding mounting through holes 21 and the connecting convex rings 3 are increased or decreased accordingly.

[0052] A connecting flange 41 is provided at one end of the connecting pipe structure 4 away from the spherical tank shell 1, and connection can be realized through the connecting flange 41, which is convenient for connection.

[0053] Among them, the nozzle structure 4 can be selected as one of the input medium, output medium, relief, safety valve port, etc. When the nozzle structure 4 is not needed, the connection flange 41 on the nozzle structure 4 can be blocked by a flange cover.

[0054] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the appended claims.

Claims

1. An air inlet and outlet device for a hydrogen balloon tank, characterized in that, it includes: A flange cover is arranged on the manhole at the top of the spherical tank shell, and at least one installation through-hole is provided on the flange cover; A connecting convex ring, the outer periphery of the connecting convex ring is hermetically arranged on the inner periphery of the installation through-hole; At least one connecting pipe structure is correspondingly arranged with the connecting convex ring, the inside of the connecting pipe structure is through, and one axial end outer periphery of the connecting pipe structure is connected to the inner periphery of the connecting convex ring, so that the connecting pipe structure is fixed on the flange cover through the connecting convex ring; the other end of the connecting pipe structure protrudes upward out of the flange cover.

2. The air inlet and outlet device for a hydrogen balloon tank according to claim 1, characterized in that, The outer peripheral wall of the connecting convex ring protrudes outward circumferentially; The inner peripheral wall of the installation through-hole protrudes inward circumferentially, and the protruding part of the connecting convex ring and the protruding part on the installation through-hole face each other; An annular welding gap is jointly constructed between the outer peripheral wall of the connecting convex ring and the inner peripheral wall of the installation through-hole, and the connecting convex ring is welded on the inner peripheral wall of the installation through-hole along the welding gap.

3. The air inlet and outlet device for a hydrogen balloon tank according to claim 2, characterized in that, The outer peripheral wall of the connecting convex ring includes a first inner inclined surface, a first transition surface and a first outer inclined surface that are sequentially connected upward along the axis; The inner peripheral wall of the installation through-hole includes a second inner inclined surface, a second transition surface and a second outer inclined surface that are sequentially connected upward along the axis; The first inner inclined surface and the second inner inclined surface form a first included angle, and the first included angle faces the spherical tank shell; The first transition surface and the second transition surface are spaced relatively; The first outer inclined surface and the second outer inclined surface form a second included angle, and the second included angle faces away from the spherical tank shell.

4. The air inlet and outlet device for a hydrogen balloon tank according to claim 3, characterized in that, The distance between the first transition surface and the second transition surface is 1 mm to 3 mm; The angle of the first included angle is 50° to 55°; The angle of the second included angle is 45° to 50°.

5. The air inlet and outlet device for a hydrogen balloon tank according to claim 1, characterized in that, The axial dimension of the connecting convex ring matches the axial length of the installation through-hole; The lower side surface of the connecting convex ring along the axis and the lower port of the installation through-hole along the axis are flush with each other; The lower side surface of the connecting convex ring along the axis and the lower end surface of the connecting pipe structure along the axis are flush with each other.

6. The air inlet and outlet device for a hydrogen balloon tank according to claim 1, characterized in that, The upper side surface of the connecting convex ring facing away from the spherical tank shell is an inclined surface, so that the axial dimension of the connecting convex ring gradually increases in the radial direction close to the axis.

7. The air inlet and outlet device for a hydrogen balloon tank according to claim 6, characterized in that, The axial included angle between the inclined surface and the connecting pipe structure is 40° to 50°; and / or The upper end of the inclined surface is arc-shaped, and the arc-shaped part of the inclined surface is tangent to the outer peripheral wall of the connecting pipe structure.

8. The air inlet and outlet device for a hydrogen balloon tank according to claim 1, characterized in that, The installation through holes are provided in plurality, and the plurality of installation through holes are circumferentially distributed at intervals around the center of the flange cover. The pipe connection structures are provided in plurality, and the pipe connection structures are respectively arranged on the installation through holes one by one through the connecting rings.

9. The air inlet and outlet device of a hydrogen balloon tank according to claim 1, characterized in that the pipe connection structure and the connecting ring are integrally formed; a connecting flange is circumferentially provided at one end of the pipe connection structure away from the connecting ring.

10. The air inlet and outlet device of a hydrogen balloon tank according to claim 1, characterized in that the flange cover includes a cylinder body and a cover body. One end of the cylinder body is open and sleeved on the manhole at the top of the spherical tank shell. The cover body is detachably connected to the bottom edge of the cylinder body. The cover body is configured to be able to cover or open the other end opening of the cylinder body, and the installation through holes are arranged on the cover body; one side of the cover body is rotatably connected to the cylinder body, and the other side is connected to the cylinder body by bolts. A handle is provided on the cover body, and the installation through holes are located between the handle and the rotational connection position of the cover body; a sealing ring is provided at the position where the cylinder body and the cover body are mutually covered.

11. A hydrogen balloon tank, characterized in that it includes the air inlet and outlet device of a hydrogen balloon tank according to any one of claims 1 to 10, and further includes: a spherical tank shell, a manhole is provided on the top of the spherical tank shell, and the flange cover is arranged on the manhole and can close the manhole.

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