KR102460141B1 - pressure vessel - Google Patents

Abstract

In order to improve the sealing performance, the present invention provides a cylindrically shaped boss extension in which a through hole is formed through the center in the vertical direction, and a lower portion of the boss extension integrally extending radially outward along the circumferential direction and extending in the radial direction. a boss part including a boss flange part having the through-hole extending in the vertical direction on the inside; a liner part provided in a container shape, the upper part of which is insert-injected along the lower surface of the boss flange part to be hermetically coupled, the liner part having a receiving space communicating with the through hole to accommodate the fluid therein; and a plurality of coupling nuts that are hermetically coupled to a boundary region between a lower portion of the boss flange portion and an upper portion of the liner portion so as to block the outflow of the fluid accommodated in the accommodation space are provided along the vertical direction, and a tight seal is provided between each of the coupling nuts. It provides a pressure vessel including a multi-sealing portion is additionally interposed.

Description

pressure vessel

The present invention relates to a pressure vessel, and more particularly, to a pressure vessel having improved sealing performance.

In general, in order to store various types of gases such as hydrogen, nitrogen, natural gas, and the like, and to discharge the stored gas as necessary, a gas storage container is required. In particular, the gas needs to be stored at a high pressure because the storage density in the vessel is low, and a pressure vessel is essential for use in such a high pressure environment.

For example, in an alternative fuel gas vehicle including a fuel cell vehicle or a compressed natural gas vehicle, the structure of the storage system varies depending on the storage method of fuel gas, and currently, in consideration of the unit price, weight, and simplicity of the storage system, The storage method is popular. However, since gaseous fuel has a low energy storage density, it is necessary to increase the storage amount or increase the storage pressure to secure a longer driving distance. In particular, in the case of automobiles, there is a limit to increasing the size of the storage tank due to the limited space for mounting the gas storage system.

And, in the case of a composite tank among fuel gas storage tanks, the outer shell is reinforced with a fiber-reinforced composite material with high specific strength and specific stiffness to handle the internal pressure caused by compressed gas, and a liner that maintains gas tightness inside is inserted At this time, the fuel gas storage tank is divided into types according to the material of the liner, and a tank in which a liner made of a metal material such as aluminum is inserted is classified as type 3, and a tank in which a high-density polymer liner is inserted is classified as type 4.

In detail, in the case of Type 3, the stability is relatively high, but it is expensive and has poor fatigue resistance, whereas the Type 4 tank is cheaper than Type 3 and has excellent fatigue resistance, but hydrogen leakage and There is a problem of safety, such as a decrease in permeability resistance. In particular, since the metal nozzle applied for external valve mounting and the plastic material of the body are of different types, the airtight integrity of the boss extension is important.

That is, even when a pressure vessel was manufactured using a plastic liner, the nozzle boss had to use a metal or non-metal material different from the liner, and this resulted in a bonding force between the metallic or non-metallic nozzle boss and the plastic liner, which was not generated when using a metallic liner. There was a problem with lowering.

Here, in order to solve the above problems, conventionally, a plastic fastener for binding the plastic liner and the metallic nozzle boss was used, but this caused another problem in that it was difficult to install the fastener inside the plastic liner.

As another method, a groove was made in the nozzle boss and used as a method of insert molding the nozzle boss into a plastic liner, but this was also somewhat difficult to realize a perfect bonding state.

Therefore, there is an urgent need for research to improve the bonding force between the metallic or non-metallic nozzle boss and the plastic liner to prevent the non-ideal outflow of the fluid filled therein.

Korean Patent Registration No. 10-1434046

In order to solve the above problems, an object of the present invention is to provide a pressure vessel having improved sealing performance.

In order to solve the above problems, the present invention is provided in a cylindrical shape and is integrally extended outward in the radial direction along the circumferential direction at the bottom of the boss extension portion and the through-hole in the central portion in the vertical direction to penetrate, a boss part including a boss flange part having the through hole extending in the vertical direction inside the radial direction; a liner part provided in a container shape, the upper part of which is insert-injected along the lower surface of the boss flange part to be hermetically coupled, the liner part having a receiving space communicating with the through hole to accommodate the fluid therein; and a plurality of coupling nuts that are hermetically coupled to a boundary region between a lower portion of the boss flange portion and an upper portion of the liner portion so as to block the outflow of the fluid accommodated in the accommodation space are provided along the vertical direction, and a tight seal is provided between each of the coupling nuts. A multi-sealing part having an additional interposed therebetween, wherein a close contact groove which surrounds the radially outer side of the through hole and is spaced apart is formed in the lower part of the boss flange to be depressed upward along the circumferential direction, and the upper inner end of the liner part has the contact groove. A first bent end that is in close contact with the outer wall and integrally extends upwardly is bent, and at the upper end of the first bent end, a second bent end that is in close contact with the upper surface of the contact groove and integrally extends secondarily in the radial direction is formed. Provided is a pressure vessel characterized in that this is bent.

On the other hand, the present invention is provided in a cylindrical shape, and a boss extension in which a through hole is formed through the center in the vertical direction, and the lower portion of the boss extension integrally extended radially outward along the circumferential direction, and the through hole is formed inside the radial direction. a boss portion including a boss flange portion in which the hole extends in the vertical direction and is formed in a lower portion of the through hole in a radially outer portion of the through hole, the contact groove spaced apart from each other being depressed upward along the circumferential direction; It is provided in a container shape and the upper part is insert-injected along the lower surface of the boss flange part and sealed-coupled, and the first bent end which is in close contact with the outer wall of the close contact groove at the upper inner end is bent and integrally extends upward, At the upper end of the first bent end, a second bent end that is in close contact with the upper surface of the contact groove and integrally extended in the radial direction is bent, and a receiving space communicating with the through hole to accommodate the fluid therein. a liner unit formed; and a boundary region between the lower portion of the boss flange portion and the upper portion of the liner portion is hermetically coupled to block the outflow of the fluid contained in the accommodation space, and is provided in a ring shape so that the upper surface is closely pressed against the lower surface of the second bent end and at the same time the A first coupling nut that is closely coupled along the circumferential direction between the inner side of the first bent end and the inner wall of the close contact groove, and a first coupling nut that is spaced apart from the lower side of the first coupling nut and closely coupled to the inner wall of the close contact groove A plurality of coupling nuts including two coupling nuts are provided along the vertical direction, interposed between the lower portion of the first coupling nut and the upper portion of the second coupling nut, the inner side of the first bent end and the inside of the contact groove It provides a pressure vessel including a multi-sealing portion provided with a close-contact sealing portion that is pressed in surface contact along the circumferential direction between the side walls.

Through the above solution means, the present invention provides the following effects.

First, since the first bent end extending primarily upwardly to the upper inner end of the liner unit and the second bent end extending integrally secondarily in the radial direction are placed in close contact with the contact groove recessed upward in the boss flange portion, repeated contraction of the liner and Even during relaxation, the fastening force with the boss part is firmly maintained, so that airtightness can be remarkably improved.

Second, the sealing performance is improved as the first coupling nut is first pressed upwardly and tightly under the boundary area of the boss and the liner, which are provided as different materials, and the flow is fixed as the screw is fastened. Significantly improved and fluid leakage can be blocked.

Third, in a state in which the first coupling nut is fixed to the lower side of the boundary area between the outer surface of the sealing step and the inner end of the second bent end, the close contact sealing part under the first coupling nut is upwardly pressed and tightened by the second coupling nut. Sealing performance can be significantly improved through the sealing structure.

Fourth, the upper part of the liner part is insert-injected to the outside of the rotation prevention protrusion and the partition groove which are alternately formed along the circumferential direction at the radial outer end of the boss flange part, so that the circumferential rotation of the boss part is blocked and the sealing performance is significantly improved. can

1 is a partial cross-sectional view showing a pressure vessel according to an embodiment of the present invention.
2 is an enlarged view of part 'B' of FIG. 1 .
3 is a perspective view illustrating a coupling state between a boss portion and a liner portion in a pressure vessel according to an embodiment of the present invention;

Hereinafter, a pressure vessel according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial cross-sectional view showing a pressure vessel according to an embodiment of the present invention, FIG. 2 is an enlarged view of part 'B' of FIG. 1, and FIG. 3 is a boss portion and a pressure vessel according to an embodiment of the present invention. It is a perspective view showing the coupling state between the liner parts.

1 to 3 , the pressure vessel 200 according to an embodiment of the present invention includes a boss part 110 , a liner part 120 , and a multi-sealing part 130 .

Here, the pressure vessel 200 is a vessel used to store various fluids such as oxygen, natural gas, nitrogen, and hydrogen therein, and may be provided so that the fluid is selectively introduced and discharged repeatedly. In this case, the fluid may be stored in the pressure vessel 200 at a high pressure of 700 bar.

On the other hand, it is preferable that the boss part 110 includes a boss extension part 111 which is provided in a cylindrical shape and through which a through hole 112 is formed through the central part in the vertical direction. In addition, the boss part 110 is integrally extended radially outward along the circumferential direction at the lower part of the boss extension part 111, and the boss flange part in which the through hole 112 extends in the vertical direction in the radial direction. (113) is preferably included.

Here, the boss extension part 111 and the boss flange part 113 are integrally formed with each other, and the boss extension part 111 is formed on the upper side of the boss part 110 and the boss flange part 113 is formed. It is preferable to understand that it is formed on the lower side of the boss part 110 .

At this time, the outer surface of the boss extension part 111 may be recessed radially inward along the circumferential direction toward the boundary area with the boss flange part 113 from the upper end to be concave in a rounded shape.

In addition, the upper surface of the boss flange part 113 may be formed to extend radially outward along the circumferential direction toward the lower end from the boundary region with the upper boss extension part 111 .

Here, the boss part 110 including the boss extension part 111 and the boss flange part 113 may be manufactured by processing metallic steel or non-metallic aluminum, and the material is limited thereto. not.

In addition, the through hole 112 may be formed through the inside of the boss extension part 111 and the boss flange part 113 in the vertical direction, the upper end is open to the outside, and the lower end is the liner part 120 . It is preferable to communicate with the receiving space (120a) inside.

Furthermore, the through hole 112 is screwed with an external device (not shown) when the fluid is introduced into the pressure vessel 200 and the fluid is discharged to the outside of the pressure vessel 200 to prevent the fluid from flowing out. A thread may be formed on the inner circumferential surface.

On the other hand, the pressure vessel 200 may further include a composite cover part 140 provided so as to cover the outer surface of the boss extension part 111 and the upper surface of the boss flange part 113 in close contact with the upper part. can

In addition, it is preferable that the composite cover part 140 is provided such that an inner surface of the center side in the vertical direction extending downward from the upper part closely covering the boss part 110 surrounds the liner part 120 .

The composite cover part 140 is formed by impregnating a reinforcing fiber such as carbon fiber, glass fiber, or synthetic polyamide fiber in a resin such as an epoxy resin, and is formed on the outside of the boss part 110 and the liner part 120 . Filament can be wound or laminated to a set thickness.

Through this, as the composite cover part 140 is wound or laminated on the outside of the boss part 110 and the liner part 120, the pressure resistance of the receiving space 120a inside the liner part 120 is improved. can

On the other hand, the liner part 120 is provided in a container shape, the receiving space 120a communicating with the through hole 112 to accommodate the fluid therein is formed, and the upper part is the lower surface of the boss flange part 113 . It is preferable that the insert is injected and sealed together.

Here, the liner part 120 may be made of a synthetic resin material that is different from the boss part 110 . At this time, the boss part 110 is inserted between the upper mold (not shown) and the lower mold (not shown), and the boss part 110 is inserted between the upper mold (not shown) and the lower mold (not shown). A spaced space (not shown) communicating with the may be formed.

And, as the synthetic resin is injected into the separation space (not shown) and cured, the liner unit 120 may be manufactured by insert injection. In addition, the upper and lower portions of the liner unit 120 may be separately manufactured and coupled to each other through laser welding.

On the other hand, it is preferable that the boss flange portion 113 has a contact groove 113a at the lower portion that surrounds the radially outer side of the through hole 112 and is spaced apart and recessed upward along the circumferential direction.

Further, on the upper portion of the liner part 120 , a liner extension part 121 extending radially inward along the lower surface of the boss flange part 113 and having an upper surface in close contact with the lower surface of the boss flange part 113 is provided. It is preferable to form

Here, it is preferable that the first bent end 122 which is in close contact with the outer wall of the radially outer side of the contact groove 113a and which firstly extends upwardly is bent at the upper inner end of the liner unit 120 . In this case, it is preferable that the first bent end 122 is integrally bent upward from the radially inner end of the liner extension 121 .

In addition, it is preferable that the second bent end 123 that is in close contact with the upper surface of the contact groove 113a and that is integrally secondarily extended in the radial direction is integrally bent and extended at the upper end of the first bent end 122 . . Here, the first bent end 122 and the second bent end 123 may be formed in a shape corresponding to the shape of the mold during insert injection of the liner unit 120 , and may be post-processed in some cases. .

In addition, a sealing step 113b may be formed in a position facing the inner end of the second bent end 123 in the radial direction on the boss flange portion 113 to be stepped along the circumferential direction. At this time, the sealing step 113b may be formed to be stepped along the circumferential direction inside the upper end of the contact groove 113a.

Here, the radially outer surface of the sealing step 113b may be in surface contact with the radially inner end of the second bent end 123 . That is, the second bent end 123 may be in close contact with the inner end of the second bent end 123 in surface contact with the outer surface of the sealing step 113b and in close contact with the upper surface of the second bent end 123 in surface contact with the contact groove 113a. . In addition, the lower surface of the sealing step 113b may be in close contact with the radially inner upper surface of the first coupling nut 131a to be described later.

At this time, it is preferable that the first bent end 122 is in close contact with the outer wall of the radially outer side of the contact groove 113a and the second bent end 123 is disposed above the contact groove 113a. Accordingly, a space for arranging the multi-sealing part 130 is upwardly pressed may be formed inside the first bent end 122 in the radial direction.

Through this, the first bent end 122 extending primarily upwardly from the upper inner end of the liner unit 120 and the second bent end 123 extending integrally with the second in the radial direction are connected to the boss plan. It is disposed in close contact with the contact groove 113a recessed upward in the branch 113 . Therefore, even when the liner part 120 is repeatedly contracted and relaxed, the fastening force with the boss part 110 is maintained firmly, so that airtightness can be remarkably improved.

In addition, it is preferable that the multi-sealing part 130 is closely disposed below the boundary area between the radially outer surface of the sealing step 113b and the radially inner end of the second bent end 123 .

On the other hand, the multi-sealing part 130 is hermetically coupled to the boundary region between the lower part of the boss flange part 113 and the upper part of the liner part 120 to block the outflow of the fluid accommodated in the accommodation space 120a. desirable.

Here, it is preferable that the multi-sealing part 130 includes a plurality of coupling nuts 131 that are hermetically coupled to block the outflow of the fluid accommodated in the accommodating space 120a and are provided along the vertical direction. In addition, it is preferable that the multiple sealing part 130 includes a close contact sealing part 132 interposed between each of the coupling nuts 131 .

At this time, the coupling nut 131 preferably includes a first coupling nut (131a) and a second coupling nut (131b). in detail, The first coupling nut 131a is provided in a ring shape so that the radially outer upper surface is in close contact with the lower surface of the second bent end 123 and is pressed in close contact, and the radially inner upper surface is on the lower surface of the sealing step 113b. It is preferable that the surface is contacted and pressurized closely.

At this time, the height of the lower surface of the sealing step 113b and the lower surface of the second bent end 123 that can be contracted and relaxed during insert injection may be slightly different from each other to form a step difference. Each lower surface of the sealing step 113b and the second bent end 123 may be pressed in close contact with each other at the same time through the upward close pressing of the coupling nut 131a.

At the same time, the first coupling nut 131a is formed along the circumferential direction between the radially inner side of the first bent end 122 and the inner wall of the contact groove 113a on the lower side of the sealing step 113b. It is preferable to be tightly bonded.

At this time, it is preferable that the first coupling nut 131a is provided in a ring shape that is spaced apart from the through hole 112 and extends in a shape surrounding the radially outer side of the through hole 112 along the circumferential direction.

Here, a fastening screw thread may be formed at the inner end of the first coupling nut 131a in the vertical direction along the circumferential direction. In addition, the inner wall of the contact groove 113a on the lower side of the sealing step 113b opposite to the radially inner end of the first coupling nut 131a is fastened to the fastening screw thread of the first coupling nut 131a. A screw coupling portion may be formed so as to be possible.

Accordingly, the first coupling nut 131a may be screwed to the boss flange part 113 and press-fastened in an upward direction. In this case, the first coupling nut 131a may be made of metallic steel or non-metallic aluminum, which is the same material as that of the boss unit 110 .

Here, unlike the conventional method in which the elastic sealing means is in direct contact with the boundary area between the boss part and the liner part, the boundary area between the radially outer surface of the sealing step 113b and the radially inner end of the second bent end 123 is different from the prior art. The first coupling nut 131a is first screwed on the lower side. In addition, the sealing performance is remarkably improved as the close contact sealing part 132, which will be described later, is secondarily interposed on the lower surface of the first coupling nut 131a in a state where the flow is fixed as the first upward contact pressure is applied and the screw is fastened. Outflow can be blocked.

On the other hand, the close contact sealing portion 132 is preferably interposed between the lower portion of the first coupling nut (131a) and the upper portion of the second coupling nut (131b). At the same time, the close contact sealing portion 132 is in surface contact along the circumferential direction between the radially inner side of the first bent end 122 and the inner wall of the close contact groove 113a on the lower side of the sealing step 113b. Pressurized is preferred.

In detail, the close contact sealing part 132 has an upper surface in surface contact contact with the lower surface of the first coupling nut 131a, and the radially inner side of the first bent end 122 and the lower side of the sealing step 113b. It is preferable to include an elastic sealing portion (132a) that is pressed against the surface in the circumferential direction between the inner wall of the close contact groove (113a).

Here, it is preferable that the elastic sealing part 132a is made of an elastic material including ethylene propylene diene monomer (EPDM). Here, the ethylene propylene diene monomer has excellent ozone resistance, weather resistance, heat resistance, solvent resistance, etc., has a small specific gravity compared to other synthetic rubbers, and is highly economical because it can be highly filled with fillers and oils.

At this time, it is preferable that the elastic sealing part 132a is provided in a ring shape that is spaced apart from the through hole 112 and extends in a shape surrounding the radially outer side of the through hole 112 along the circumferential direction.

In addition, the close contact sealing part 132 has an upper surface in surface contact contact with the lower surface of the elastic sealing part 132a, and the radially inner side of the first bent end 122 and the lower side of the sealing step 113b are in close contact. It is preferable to include a washer (132b) that is pressed against the surface in the circumferential direction between the inner wall of the groove (113a). At this time, it is preferable that the washer (132b) has a lower surface in surface contact with the upper surface of the second coupling nut (131b).

Here, the washer 132b is preferably provided in a ring shape that is spaced apart from the through hole 112 and extends along the circumferential direction to surround the outer side of the through hole 112 in the radial direction.

In addition, the second coupling nut 131b is preferably disposed spaced apart from the lower side of the first coupling nut 131a and closely coupled to the inner wall of the contact groove 113a.

in detail, It is preferable that the second coupling nut 131b is provided in a ring shape so that the upper surface is in surface contact with the lower surface of the washer 132b and is pressed in close contact. At this time, it is preferable that the second coupling nut 131b is provided in a ring shape that is spaced apart from the through hole 112 and extends along the circumferential direction to surround the outer side of the through hole 112 in the radial direction. At the same time, it is preferable that the second coupling nut 131b is closely coupled to the inner wall of the contact groove 113a on the lower side of the sealing step 113b in the circumferential direction.

Here, a fastening screw thread may be formed at the radially inner end of the second coupling nut 131b in the vertical direction along the circumferential direction. In addition, the inner wall of the contact groove 113a on the lower side of the sealing step 113b opposite to the radially inner end of the second coupling nut 131b is fastened to the fastening screw thread of the second coupling nut 131b. A screw coupling portion may be formed so as to be possible.

Accordingly, the second coupling nut 131b may be screwed to the boss flange portion 113 and press-tightened in an upward direction. In this case, the first coupling nut 131a may be made of metallic steel or non-metallic aluminum, which is the same material as that of the boss unit 110 .

In addition, the second coupling nut 131b has a radially inner upper surface that is in surface contact with the lower surface of the washer 132b and is pressed in close contact, and the radially outer upper surface of the second coupling nut 131b is the liner extension part ( 121), it is preferable to be spaced apart from the lower surface of the inner end side in the radial direction. Through this, since the radially outer upper surface of the second coupling nut 131b is spaced apart from the lower surface of the radially inner end side of the liner extension part 121, the second coupling nut 131b closes the tight sealing part 132. A space for upwardly pressing can be stably secured.

Accordingly, the first coupling nut 131a is fixed to the lower side of the boundary region between the radially outer surface of the sealing step 113b and the radially inner end of the second bent end 123, the first coupling The sealing performance can be remarkably improved through the double sealing structure in which the tight sealing part 132 under the nut 131a is upwardly pressed and tightened by the second coupling nut 131b.

On the other hand, referring to FIG. 3 , a plurality of anti-rotation protrusions 113c protruding to be bent outwardly in a radial direction at a predetermined distance along the circumferential direction are integrally formed at the outer end of the boss flange 113 in the radial direction. It is preferable to form

In addition, it is preferable that a partition groove 113d is recessed in the radial direction between each of the rotation preventing protrusions 113c at the outer end of the boss flange 113 in the radial direction. At this time, it is preferable that the anti-rotation protrusion 113c and the partition groove 113d are alternately formed along the circumferential direction at the outer end of the boss flange 113 in the radial direction.

Here, the filling extension part 126 which is inserted and injected into each of the partition grooves 113d to be closely fitted to the outer edge of the partition groove 113d may be integrally formed on the upper portion of the liner part 120 .

Accordingly, the upper portion of the liner portion 120 is inserted outside the rotation preventing protrusion 113c and the partition groove 113d alternately formed along the circumferential direction at the outer end of the boss flange portion 113 in the radial direction. Since it is injected and closely molded, the circumferential rotation of the boss part 110 is blocked, so that the sealing performance can be remarkably improved.

And, referring to FIG. 1 , it is preferable that an insert guide groove 113e is continuously depressed in the radial direction along the circumferential direction at the upper radially outer end of the anti-rotation protrusion 113c. In this case, the radially inner end of the insert guide groove 113e may be formed to be stepped.

In addition, in the upper portion of the liner part 120, the outer shape fitting part 124 is inserted so as to be in close contact with the insert guide groove 113e so as to be inclined upward in the radial direction from the upper outer side of the liner part 120 in the circumferential direction. It is preferable to be ejected and extended.

Here, the outline fitting portion 124 may integrally extend from the radially outer side of the liner extension portion 121 to be inclined upwardly toward the radially inner side so as to cover the upper surface of the insert guide groove 113e. At this time, it is preferable that the outer shape fitting portion 124 is closely fitted to the insert guide groove 113e.

Accordingly, the outline-shaped part 124 of the liner part 120 is inserted into the insert guide groove 113e which is recessed radially inward along the circumferential direction at the upper radially outer end of the anti-rotation protrusion 113c. It is ejected and molded closely. Accordingly, the occurrence and deformation of the vertical gap between the boss part 110 and the liner part 120 is minimized, so that the fluid leakage can be minimized.

And, it is preferable that the boss flange part 113 has a filling communication hole 113f in which the upper end communicates with one side of the insert guide groove 113e and the lower end communicates with the lower surface of the boss flange part 113 through. .

At this time, the filling communication hole (113f) may be formed to be inclined inwardly in the radial direction toward the lower side. In addition, it is preferable that the filling communication hole 113f is spaced apart from the partition groove 113d in a circumferential direction.

In addition, it is preferable that the liner support part 125 for insert injection into the filling communication hole 113f is formed on the upper part of the liner part 120 . At this time, the liner support part 125 has an upper end integrally connected to the outer shape fitting part 124 and a lower end of the liner extension part 121 extending radially inward along the lower surface of the boss flange part 113 . It is preferable to be integrally connected to.

Here, the filling communication holes 113f are spaced apart from each other at a predetermined distance along the circumferential direction of the boss flange portion 113 and may be formed in a plurality of places. In addition, the liner support 125 may be formed in a plurality of places to correspond to the filling communication hole 113f, and to be spaced apart from each other at a distance corresponding to the interval between the filling communication holes 113f along the circumferential direction. can

Accordingly, the upper end of the boss flange portion 113 communicates with one side of the insert guide groove 113e and the lower end communicates with the lower surface of the boss flange portion 113, and the liner is inserted into the penetrating filling communication hole 113f. The liner support part 125 of the part 120 is insert-injected and closely molded. Through this, the occurrence and deformation of vertical gap between the boss part 110 and the liner part 120 is minimized, and at the same time, the circumferential rotation of the boss part 110 is prevented in advance, so that the sealing performance can be remarkably improved.

In this case, terms such as "comprises", "comprises" or "include" described above mean that the corresponding component may be inherent unless otherwise stated, so other components are excluded. Rather, it should be construed as being able to include other components further. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

As described above, the present invention is not limited to each of the above-described embodiments, and modifications can be implemented by those of ordinary skill in the art to which the present invention pertains without departing from the scope of the claims of the present invention. and such modifications are within the scope of the present invention.

110: boss part 111: boss extension part
112: through hole 113: boss flange part
113a: close contact groove 113c: anti-rotation projection
113d: compartment groove 113e: insert guide groove
113f: filling communication hole 120: liner part
121: liner extension 122: first bending end
123: second bending end 130: multiple sealing part
131: coupling nut 131a: first coupling nut
131b: second coupling nut 132: close sealing part
140: composite cover part 200: pressure vessel

Claims (11)

A boss extension part provided in a cylindrical shape and having a through hole penetrated in the vertical direction in the central part, and a lower portion of the boss extension part extending radially outwardly along the circumferential direction, the through hole inside the radial direction in the vertical direction a boss portion including an extended boss flange portion;
a liner part provided in a container shape, the upper part of which is insert-injected along the lower surface of the boss flange part to be hermetically coupled, the liner part having a receiving space communicating with the through hole to accommodate the fluid therein; and
A plurality of coupling nuts that are hermetically coupled to a boundary region between the lower portion of the boss flange portion and the upper portion of the liner portion to block the outflow of the fluid accommodated in the accommodation space are provided along the vertical direction, and a close sealing portion between each of the coupling nuts is provided. Including an intervening multi-sealing unit,
In the lower portion of the boss flange portion, a close contact groove that surrounds the radially outer side of the through hole and is spaced apart is formed to be depressed upwardly in the circumferential direction,
A first bent end that is in close contact with the outer wall of the contact groove and integrally extends upwardly is formed on the upper inner end of the liner part,
A pressure vessel, characterized in that the second bent end is formed in close contact with the upper surface of the contact groove at the upper end of the first bent end, the second bent end integrally extending in the radial direction is bent. delete The method of claim 1,
The coupling nut is
A first coupling nut provided in a ring shape, the upper surface of which is closely pressed against the lower surface of the second bent end, and closely coupled along the circumferential direction between the inner side of the first bent end and the inner wall of the contact groove;
and a second coupling nut that is spaced apart from the lower side of the first coupling nut and closely coupled to the inner wall of the close contact groove,
The close contact sealing portion is interposed between the lower portion of the first coupling nut and the upper portion of the second coupling nut, and is surface-contacted and pressed along the circumferential direction between the inner side of the first bent end and the inner wall of the close contact groove. pressure vessel. 4. The method of claim 3,
In the boss flange portion, a sealing step is formed to be stepped along the circumferential direction at a position facing the radially inner end of the second bent end,
The radially outer surface of the sealing step is in surface contact with the radially inner end of the second bent end,
The radially inner upper surface of the first coupling nut is surface-contacted with the lower surface of the sealing step, and the radially outer upper surface of the first coupling nut is surface-contacted with the lower surface of the second bent end. 5. The method of claim 4,
A fastening screw is formed at the inner end of the first coupling nut in the vertical direction along the circumferential direction,
A pressure vessel, characterized in that the screw coupling portion is formed to be fastened to the fastening screw thread of the first coupling nut on the inner wall of the contact groove on the lower side of the sealing step opposite to the inner end of the first coupling nut. 4. The method of claim 3,
The close sealing part
An elastic sealing part whose upper surface is in surface contact with the lower surface of the first coupling nut and is surface-contacted and pressed along the circumferential direction between the inner side of the first bent end and the inner wall of the close contact groove;
and a washer whose upper surface is in surface contact with the lower surface of the elastic sealing part and the lower surface is in surface contact with the upper surface of the second coupling nut. 7. The method of claim 6,
In the second coupling nut, the radially inner upper surface is in surface contact with the lower surface of the washer and is pressed in close contact,
The radially outer upper surface of the second coupling nut is spaced apart from the radially inner end surface of the liner extension extending in the radial inward direction along the lower surface of the boss flange. The method of claim 1,
A plurality of anti-rotation protrusions are integrally formed at the outer end of the boss flange portion at a predetermined interval along the circumferential direction to extend and protrude to be bent outward in the radial direction,
A partition groove is formed to be depressed in the radial direction between each of the anti-rotation protrusions, and the anti-rotation protrusion and the partition groove are alternately formed along the circumferential direction. 9. The method of claim 8,
In the upper outer end of the anti-rotation protrusion, an insert guide groove is formed to be recessed radially inward along the circumferential direction, and the inner end of the insert guide groove is formed to be stepped,
The pressure vessel, characterized in that the outer molded portion is inserted and extended to be inclined upwardly from the upper outer side of the liner portion in the circumferential direction to the inner side in the circumferential direction so as to be closely fitted to the insert guide groove on the upper portion of the liner portion. 10. The method of claim 9,
A filling communication hole through which the upper end communicates with one side of the insert guide groove and the lower end communicates with the lower surface of the boss flange portion is formed in the boss flange portion,
A liner support part for insert injection into the filling communication hole is formed on the upper part of the liner part, the upper end of the liner support part is integrally connected to the outer shape fitting part, and the lower end of the liner support part is radially inward along the lower surface of the boss flange part. A pressure vessel integrally connected to the extended liner extension. A boss extension part provided in a cylindrical shape and having a through hole penetrated in the vertical direction in the central part, and a lower portion of the boss extension part extending radially outwardly along the circumferential direction, the through hole inside the radial direction in the vertical direction a boss part including a boss flange part extending and enclosing a radially outer side of the through-hole at a lower portion and having a close contact groove spaced apart from each other in a circumferential direction;
It is provided in a container shape and the upper part is insert-injected along the lower surface of the boss flange part and sealed-coupled, and the first bent end which is in close contact with the outer wall of the close contact groove at the upper inner end is bent and integrally extends upward, At the upper end of the first bent end, a second bent end that is in close contact with the upper surface of the contact groove and integrally extended in the radial direction is bent, and a receiving space communicating with the through hole to accommodate the fluid therein. a liner unit formed; and
It is hermetically coupled to the boundary region between the lower part of the boss flange and the upper part of the liner part so as to block the outflow of the fluid accommodated in the accommodation space, and is provided in a ring shape so that the upper surface is closely pressed against the lower surface of the second bent end and at the same time, the first A first coupling nut closely coupled along the circumferential direction between the inner side of the first bent end and the inner wall of the close contact groove, and a second coupling nut that is spaced apart from the lower side of the first coupling nut and closely coupled to the inner wall of the close contact groove A plurality of coupling nuts including coupling nuts are provided along the vertical direction, interposed between the lower portion of the first coupling nut and the upper portion of the second coupling nut, the inner wall of the first bent end and the inner wall of the contact groove A pressure vessel including a multi-sealing unit provided with a close-contact sealing unit that is pressed by surface contact along the circumferential direction therebetween.

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