KR102432515B1 - Low-pressure gas storage tank with multiple pressurization structure - Google Patents

Abstract

Disclosed is a low-pressure gas storage tank with a multiple pressurization structure, wherein deterioration in sealing between a head part and a sleeve, which is caused by the undercut of the head part of a liner generated during cooling after the injection molding of the liner, is prevented, deterioration in sealing is prevented even after repeated use for a long period of time, and the separation of an interface between an insert and the head part can be prevented even if repeated torsion load is applied by the attachment and detachment of a valve. The low-pressure gas storage tank comprises: a liner formed by injection molding so that a head part capable of injecting low-pressure gas into a main body part from the outside can be provided in the main body part; an insert integrally combined with the liner during the injection molding of the liner in the shape of being enveloped by the head part to prevent undercut on the inner circumference surface of the head part during the cooling of the liner; a sleeve inserted into the insert to be combined with the insert by forcible fitting; and a pressurizing combination member screwed to the outer circumference surface of the head part and pressurizing and pushing in the sleeve toward the insert by being screwed to the outer circumference surface of the head part so that pressurizing adhesion between the inner circumference surface of the insert and the outer circumference surface of the sleeve can increase gradually.

Description

Low-pressure gas storage tank with multiple pressurization structure {LOW-PRESSURE GAS STORAGE TANK WITH MULTIPLE PRESSURIZATION STRUCTURE}

The present invention relates to a low-pressure gas storage tank, and more particularly, to a low-pressure gas storage tank having a multi-pressurization structure that can be repeatedly filled and used with a low-pressure gas such as liquefied petroleum gas.

In general, a low-pressure gas storage container, which is filled and stored with relatively low-pressure gas, such as a fuel storage container for a natural gas vehicle, is very light in weight and has excellent corrosion resistance. A liner is manufactured using a synthetic resin such as high-density polyethylene (HDPE), which is not manufactured in a way that manufactures the outer surface by taping carbon fiber or glass fiber impregnated with a curable polymer resin such as an epoxy resin on the outer surface of the liner. to be.

As such, a composite container using a plastic liner is lightweight, has corrosion resistance, is strong against repeated filling fatigue, and has a short gas filling time. For this reason, the development of various composite material containers using a plastic liner is being actively conducted.

In such a low-pressure gas storage container, a liner is injection-molded, a sleeve is inserted and coupled to the head of the injection-molded liner, and then the coupling fixing member is screwed to the liner head to provide a space between the head and the sleeve and the coupling fixing member. will be sealed

However, in the case of an injection-molded liner, due to the characteristic that the thickness of the head portion is thicker than the thickness of the body portion, when the liner is injection-molded and then cooled, the inner peripheral surface of the liner head portion is dug and an undercut phenomenon occurs.

Accordingly, when the sleeve made of a metal material is inserted and coupled to the head portion, a gap is generated between the inner circumferential surface of the head portion and the outer circumferential surface of the sleeve due to the undercut phenomenon occurring in the head portion, thereby reducing the sealing property between the head portion and the sleeve. As a result, there is a problem that gas leakage may occur at the interface between the head part and the sleeve.

Republic of Korea Patent Publication No. 10-0964607 (2010.06.10.)

It is an object of the present invention to provide a low-pressure gas storage tank having a nozzle boss having a multi-pressurization structure in which sealing between a head and a sleeve due to undercut of the liner head generated during cooling after injection molding of a liner is not deteriorated.

Another object of the present invention is to provide a low-pressure gas storage tank having a multi-pressurization structure that does not deteriorate even when used repeatedly for a long period of time.

Another object of the present invention is to provide a low-pressure gas storage tank having a multi-pressurization structure capable of preventing the phenomenon that the interface between the insert and the head portion is separated from each other even if repeated torsional load is applied due to valve attachment and detachment.

Other detailed objects of the present invention will be clearly grasped and understood by experts or researchers in this technical field through the specific contents described below.

In order to achieve the above object, the present invention provides a liner formed by injection molding so that a head capable of injecting a low-pressure gas into the body from the outside is provided in the body, and injection of the liner in a form wrapped by the head. An insert for preventing undercutting of the inner circumferential surface of the head when the liner is cooled by being integrally coupled to the liner during molding; a sleeve inserted into the insert and coupled to the insert in a press fit form; and the outer circumferential surface of the head A multi-pressing structure comprising a pressure coupling member that is screwed to the outer circumferential surface of the head and presses the sleeve toward the insert as it is screwed onto the outer circumferential surface of the head, thereby gradually increasing the pressure and adhesion between the inner circumferential surface of the insert and the outer circumferential surface of the sleeve A low-pressure gas storage tank is presented.

For example, the insert is coupled to the liner so as to be integrally formed with the liner during injection molding of the liner in a form in which the outer circumferential surface is wrapped by the head portion, thereby preventing the occurrence of undercut on the inner circumferential surface of the head portion when the liner is cooled. The sealing coupling part fastened in an interference fit form, and a part of the head part surrounding the outer circumferential surface of the sealing coupling part during injection molding of the liner is filled in the valley part, so that the sealing and coupling force with the head part can be improved. A close screw portion formed and a support groove formed on the inner circumferential surface of the hermetic coupling portion to support the sleeve when the sleeve is inserted into the hermetic coupling portion by a predetermined depth or more so that the sleeve is not inserted into the hermetic coupling portion by a predetermined depth or more. can

In addition, the insert may further include a plurality of anti-rotation grooves provided on the outer circumferential surface of the sealing coupling part at predetermined intervals to prevent rotation of the sealing coupling part by filling a part of the head part during injection molding of the liner.

Here, the sealing coupling portion is formed to be tapered so that a predetermined section of the inner circumferential surface gradually decreases in diameter from the support groove toward the liner body, so that the sleeve may be inserted and fastened in an interference fit manner.

For example, the sleeve may include a close coupling part inserted into the insert and coupled in an interference fit form, and when the tight coupling part is inserted into the insert to complete the interference fit, it is supported in a support groove of the insert. A support protrusion formed to protrude from the outer circumferential surface of the close-fitting portion so that the close-fitting portion is not inserted into the insert by a predetermined depth or more, and a plurality of support protrusions are formed on the outer circumferential surface of the close-fitting portion at a predetermined interval between the outer circumferential surface of the close-fitting portion and the inner circumferential surface of the insert It may include a sealing ring coupling groove to allow the sealing ring to be interposed.

Here, the tight coupling portion is formed to be tapered so that a predetermined section of the outer circumferential surface gradually decreases in diameter from the support protrusion toward the liner body, and as the insert is inserted and fastened, the adhesion strength with the inner circumferential surface of the insert is gradually increased. It can be inserted and fastened in the form of an interference fit.

For example, the pressure coupling member includes a pressure coupling body portion screwed to the outer circumferential surface of the head portion, and protruding from the inner circumferential surface of the pressure coupling body portion, so that the sleeve is inserted into the insert side as the pressure coupling body portion is screwed to the outer circumferential surface of the head portion. It may include a pressing protrusion for preventing separation by supporting the sleeve and the insert at the same time as pressing and pushing, and a sealing packing interposed between the sleeve and the insert and the pressing protrusion.

On the other hand, the inner circumferential surface of the pressing protrusion may be provided with a threaded portion to which a safety pin inserted and coupled into the sleeve through the pressing protrusion is screwed.

In addition, the pressure coupling member further includes a contact wing portion provided on the outer circumferential surface of the pressure coupling body portion so that the pressure coupling body portion is screwed to the outer circumferential surface of the head portion so as to be in pressure contact with the liner body portion located around the head portion. can do.

As described above, the low-pressure gas storage tank according to an embodiment of the present invention is coupled to the liner so that the insert made of a metal material itself is wrapped by the head in the double injection form during injection molding of the liner, thereby injecting the liner. Since it is possible to fundamentally prevent the occurrence of undercutting in the head during molding and cooling, it is possible to prevent gas leakage due to the deterioration of the sealing property between the head and the sleeve due to the undercut occurring in the head. there is

In addition, since the multiple sealing between the head and the insert and between the sleeve and the insert is effective in preventing the low-pressure gas stored in the main body from leaking to the outside.

In addition, even if a torsional load is applied to the pressure coupling member by an external force such as valve attachment and detachment, and the torsional load is transmitted to the insert, the insert is not twisted. There is an effect that can fundamentally prevent the leakage of the low-pressure gas stored in the unit to the outside.

Ultimately, the low-pressure gas storage tank of the multi-pressurization structure according to an embodiment of the present invention has a low surface energy of a liner manufactured using a synthetic resin such as high-density polyethylene and a metallic insert and a metallic insert even if a decrease in elasticity occurs due to repeated use for a long period of time. The fine separation of the interface between the synthetic resin liner joints does not occur, so that the external leakage of low-pressure gas can be completely prevented. There is an effect that can make it happen.

Other effects of the present invention will be clearly understood and understood by experts or researchers in the art through the specific details described below, or during the course of carrying out the present invention.

1 is a perspective view illustrating a low-pressure gas storage tank according to an embodiment of the present invention;
2 is a cross-sectional perspective view illustrating a low-pressure gas storage tank according to an embodiment of the present invention;
3 is a detailed view of 'A' of FIG. 2
4 is a detailed view of 'B' in FIG. 2
5 is an exploded view illustrating a low-pressure gas storage tank according to an embodiment of the present invention;
6 is a cross-sectional view of the insert;
7 is a side view of the sleeve;
8 is a perspective view of the pressure coupling member;

Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification is present, but one or more other features or It should be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof does not preclude the possibility of addition.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

With reference to the drawings below, preferred embodiments of the present invention will be described in more detail.

1 is a perspective view for explaining a low-pressure gas storage tank according to an embodiment of the present invention, Figure 2 is a cross-sectional perspective view for explaining a low-pressure gas storage tank according to an embodiment of the present invention, Figure 3 is Figure 2 of 'A', FIG. 4 is a detailed view of 'B' of FIG. 2, and FIG. 5 is an exploded view for explaining a low-pressure gas storage tank according to an embodiment of the present invention, FIG. 6 is a side view of the insert, FIG. 7 is a side view of the sleeve, and FIG. 8 is a perspective view of the pressure coupling member.

1 to 8 , the low-pressure gas storage tank 100 according to an embodiment of the present invention includes a liner 110 , a composite material layer 120 , an insert 130 , a sleeve 140 , and pressure bonding. A member 150 may be included.

The liner 110 includes a body part 111 in which a low-pressure gas such as liquefied petroleum gas is stored, and a head part provided in the body part 111 to inject the low-pressure gas into the body part 111 . (112).

Such a liner 110 is a high-density polyethylene ( It can be manufactured by injection molding synthetic resins such as HDPE).

The composite material layer 112 may be formed by taping carbon fibers or glass fibers impregnated with a curable polymer resin such as an epoxy resin on the outer surface of the liner 110 .

The insert 130 is coupled to the liner 110 integrally with the liner 110 during injection molding of the liner 110 in a form wrapped by the head part 112 , so that the head part 112 when the liner 110 is cooled. Prevent the occurrence of undercuts on the inner peripheral surface.

In more detail, when the liner 110 is injection molded, the thickness of the head part 112 is greater than that of the body part 111. When the liner 110 is cooled after injection molding, The undercut phenomenon in which the synthetic resin forming the liner 110 is dug into the inner circumferential surface of the head 112 and remains hollow like a groove occurs.

Therefore, when the low-pressure gas storage tank is manufactured according to the conventional method of inserting and coupling the sleeve 140 into the head portion 112 of the liner 110 after injection molding the liner 110, the head portion (112) A phenomenon in which a gap is generated between the outer circumferential surface of the sleeve 140 and the inner circumferential surface of the head 112 and the inner circumferential surface of the head 112 due to the undercut phenomenon occurring on the inner circumferential surface, resulting in a decrease in sealing properties between the head section 112 and the sleeve 140 This happens.

On the other hand, in the low-pressure gas storage tank 100 according to an embodiment of the present invention, the insert 130 is wrapped by the head part 112 and the liner 110 is inserted into the liner 110 during injection molding. The sealing property between the head part 112 and the sleeve 140 by fundamentally preventing the occurrence of undercut on the inner circumferential surface of the head part 112 when the liner 110 is cooled after injection molding of the liner 110 by being integrally combined. to be significantly improved.

For example, the insert 130 may include a sealing coupling part 131 , a sealing screw part 132 , and a support groove 133 .

The sealing coupling part 131 is coupled in a double injection shape so as to be integrated with the liner 110 during injection molding of the liner 110 in a form in which the outer circumferential surface is wrapped by the head part 112 to form the liner 110 . to fundamentally prevent the occurrence of undercuts on the inner circumferential surface of the head part 112 during cooling.

The sleeve 140 may be fastened to the inside of the sealing coupling part 131 in the form of an interference fit.

Here, the sealing coupling part 131 is tapered so that a predetermined section of the inner circumferential surface gradually decreases in diameter from the support groove 133 to the liner 110 body 111 side, so that the sleeve 140 is press-fitted. In order to be able to be inserted and fastened in the form.

When the liner 110 is injection molded, a part of the head part 112 surrounding the outer peripheral surface of the sealing coupling part 131 is filled in the valley part, thereby improving sealing and bonding strength with the head part 112 . It may be formed on the outer circumferential surface of the sealing coupling part 131 so as to be able to do so.

The support groove 133 supports the sleeve 140 when the sleeve 140 is inserted into the sealing coupling part 131 by a predetermined depth or more, so that the sleeve 140 is inserted into the sealing coupling part 131 by a predetermined depth. It may be formed on the inner circumferential surface of the sealing coupling part 131 to prevent abnormal insertion.

In addition, the insert 130 may further include a rotation preventing groove 134 .

The rotation preventing groove portion 134 is provided on the outer peripheral surface of the sealing coupling portion 131 at predetermined intervals and partially filling the head portion 112 during injection molding of the liner 110 so that the sealing coupling portion 131 is rotated. to prevent it from happening.

The sleeve 140 may be inserted into the insert 130 and coupled to the insert 130 in a form of interference fit.

For example, the sleeve 140 may include a close coupling portion 141 , a support protrusion portion 142 , and a sealing ring coupling groove portion 143 .

The close coupling portion 141 may be inserted into the insert 130 to be coupled in an interference fit form.

In more detail, the close coupling portion 141 is formed to be tapered so that a predetermined section of the outer circumferential surface gradually decreases in diameter from the support protrusion 142 toward the liner 110 body 111 side, so that the insert 130 ) may be inserted and coupled in the form of an interference fit in a form in which the adhesion strength with the inner circumferential surface of the insert 130 is gradually increased as it is inserted and fastened.

That is, a predetermined section of the inner circumferential surface of the sealing coupling portion 131 of the insert 130 is tapered so as to gradually decrease in diameter from the support groove 133 to the liner 110 body portion 111 side, and the sleeve 140 . ), a predetermined section of the outer peripheral surface of the close coupling portion 141 is tapered so that the diameter gradually decreases from the support protrusion 142 to the liner 110 body portion 111 side, whereby the close coupling portion 141 of the sleeve 140 is formed. ) to be inserted and fastened to the sealing coupling portion 131 of the insert 130 .

Here, when the tight coupling part 141 of the sleeve 140 is inserted into the sealing coupling part 131 of the insert 130, the close coupling part 141 of the sleeve 140 is tapered for a predetermined section. The starting diameter and the ending point diameter of the outer circumferential surface are formed to be larger than the starting diameter and the ending point diameter of the inner circumferential surface of the sealing coupling part 131 of the insert 130 tapered in a predetermined section by a predetermined length, so that the close coupling part 141 of the sleeve 140 is formed. ) is inserted into the sealing coupling portion 131 of the insert 130 in the form of an interference fit so that it can be coupled.

Therefore, when the close coupling portion 141 of the sleeve 140 is inserted into the tight coupling portion 131 of the insert 130 in the form of interference fit and coupled, the close coupling portion 141 of the sleeve 140 is By this, the sealing coupling portion 131 of the insert 130 is expanded and pressed toward the head portion 112 and in close contact with the insert 130 so that the sealing property between the close coupling portion 131 and the head portion 112 of the insert 130 can be further improved. do.

The support protrusion 142 is supported by the support groove 133 of the insert 130 when the tight coupling part 141 is inserted into the insert 130 and the interference fitting is completed, and the close coupling part 141 . The insert 130 may be formed to protrude from the outer peripheral surface of the close coupling portion 141 so as not to be inserted into the insert 130 by more than a predetermined depth.

Here, the support protrusion 141 and the support groove 133 are also provided with tapered portions 144 and 135 whose diameters gradually decrease toward the body portion 111 of the liner 110, respectively, so that the support groove 133 is provided. As the support protrusion 141 is inserted and seated, the support groove 133 is pressed toward the head 112 by the support protrusion 141, so that the sealing property between the support groove 133 and the support protrusion 141 is also increased. so that it can be significantly improved.

A pair of the sealing ring coupling groove portion 143 may be formed at a predetermined interval on both sides of the outer peripheral surface of the close coupling portion 141 .

Therefore, before inserting and coupling the sleeve 140 into the insert 130, the sealing ring 145 is coupled to the sealing ring coupling groove 143 of the sleeve 140, and then the sleeve 140 is inserted into the insert ( 130) by inserting it into the interior and interposing a pair of sealing rings 143 between the sleeve 140 and the insert 130 to further improve the sealing property between the sleeve 140 and the insert 130. .

The pressure coupling member 150 presses the sleeve 140 toward the insert 130 as it is screwed to the outer circumferential surface of the head part 112, thereby pushing in between the inner circumferential surface of the insert 130 and the outer circumferential surface of the sleeve 140. It may be screwed to the outer peripheral surface of the head part 112 so that the pressure adhesion can be gradually increased.

For example, the pressure coupling member 150 may include a pressure coupling body 151 , a pressure protrusion 152 , and a sealing packing 153 .

The pressure coupling body part 151 may be screwed to the outer peripheral surface of the head part 112 .

More specifically, the pressure coupling body portion 151 has a first screw portion 154 formed on one side of the inner circumferential surface and a second screw portion 155 is formed on the other side of the inner circumferential surface, and the first screw portion 154 is the head. A valve (not shown) capable of injecting a low-pressure gas into the body portion 111 of the liner 110 may be screwed to the second screw portion 155 .

The pressure protrusion 152 is formed to protrude from the inner circumferential surface of the pressure coupling body 151, and the sleeve 140 is inserted into the insert 130 as the pressure coupling body 151 is screwed to the outer circumferential surface of the head unit 112. The sleeve 140 and the insert 130 are supported at the same time to be pushed in by pressing to the side to prevent separation.

For example, the pressing protrusion 152 may be formed to protrude from the inner circumferential surface of the pressing coupling body 151 to be positioned between the first screw portion 154 and the second screw portion 155 .

Here, on the inner peripheral surface of the pressing protrusion 152 , a screw portion 156 to which a safety pin 160 inserted and coupled into the sleeve 140 through the pressing protrusion 152 is screwed may be provided.

Here, a plurality of sealing rings 161 may be interposed between the safety pin 160 and the sleeve 140 .

The sealing packing 153 is interposed between the sleeve 140 and the insert 130 and the pressing protrusion 152 to screw the pressure coupling body 151 to the outer circumferential surface of the head 112, so that the pressing protrusion By being pressed toward the sleeve 140 and the insert 130 by the 152 , the sealing property between the sleeve 140 and the insert 130 and the pressing protrusion 152 can be improved.

In addition, the pressure coupling member 150 may further include a close contact wing portion (157).

The close contact wing portion 157 is provided at the end of the outer circumferential surface of the pressure-coupled body portion 151, and as the pressure-coupled body portion 151 is screw-coupled to the outer circumferential surface of the head portion 112, the head portion 112 periphery. By allowing the liner 110 to be press-adhered to the body portion 111 , the sealing property between the head portion 112 and the pressure-coupled body portion 151 can be further improved.

For example, the close contact wing portion 157 may be formed to protrude from the outer circumferential surface of the pressure-coupled body portion so as to be integrated with the pressure-coupled body portion 151 .

For another example, the close contact wing portion 157 may be manufactured separately from the pressure-coupled body portion 151 to be detachably screwed to the outer circumferential surface of the pressure-coupled body portion 151 .

Again, the effect of the low-pressure gas storage tank according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 .

1 to 7 , in the low-pressure gas storage tank 100 according to an embodiment of the present invention, the outer peripheral surface of the insert 130 is surrounded by the head part 112 during injection molding of the liner 110 . Since the insert 130 is coupled to be integrated with the raw liner, adhesion between the head portion 112 of the liner 110 and the insert 130 may be improved.

On the other hand, the sealing coupling portion 131 of the insert 130 wrapped by the head portion 112 is formed with a close screw portion 132, the outer circumferential surface of the hermetic coupling portion 131 during injection molding of the liner 110 . By filling a portion of the head portion 112 surrounding the trough portion of the close contact screw portion 132 , the sealing and coupling force between the head portion 112 and the insert 130 can be further improved.

In addition, during the injection molding of the liner 110, the insert 130 made of a metal material itself is coupled to the liner so as to be integrated with the liner so as to be surrounded by the head part 112 in a double injection form, so that when the liner 110 is cooled. It is possible to fundamentally prevent the occurrence of an undercut phenomenon in which the inner circumferential surface of the head part 112 made of a synthetic resin material is dug and uneven.

Therefore, when the sleeve 140 is inserted into the insert 130 in an interference fit form and coupled, a gap is not generated between the insert 130 and the sleeve 140 , so that the insert 130 and the sleeve 140 . ) to greatly improve the adhesion between them.

More specifically, in the case of the liner 110 , the thickness of the head part 112 is typically manufactured to be thicker than the thickness of the body part 111 , so when the liner 110 is injection molded and cooled, In the head portion 112 of the liner 110, the inner circumferential surface is dug and an undercut phenomenon is generated. In the case of a general low-pressure gas storage container, only the sleeve 140 is simple inside the head portion 112 in which the undercut phenomenon has occurred. inserted and combined.

Therefore, due to the undercut phenomenon occurring in the head part 112 , a gap is generated between the inner peripheral surface of the head part 112 and the outer peripheral surface of the sleeve 140 , so that the sealing property between the head part 112 and the sleeve 140 . There is a problem that this is lowered.

On the other hand, in the low-pressure gas storage tank 100 according to an embodiment of the present invention, the insert 130 made of a metal material itself is wrapped by the head part 112 in a double injection form when the liner 110 is injection molded. It is coupled to the liner 110 so as to be integrally formed so that the undercut phenomenon in the head part 112 can be fundamentally prevented when the liner 110 is injection molded and cooled.

Therefore, the low-pressure gas storage tank 100 according to an embodiment of the present invention can maintain perfect sealing between the head part 112 and the insert 130, as well as the insert 130 processed very precisely with a metal material. ) The sealing property between the insert 130 and the sleeve 140 can also be significantly improved compared to the conventional low-pressure gas storage tank due to the characteristics of inserting and coupling the sleeve 140 in the form of an interference fit.

In addition, a plurality of anti-rotation grooves 134 are provided in the sealing coupling portion 131 of the insert 130 integrally coupled to the liner 110 in the form of being wrapped around the head portion 112 , thereby providing the liner 110 . ), the insert 130 is twisted even if a torsional load is applied to the pressure coupling member 150 by an external force such as valve attachment and detachment and transmitted to the insert 130 by filling a part of the head portion 112 during injection molding. Since this does not occur, even a phenomenon of mutual separation between the interface of the head portion 112 and the insert 130 may be prevented, and thus the sealing property between the insert 130 and the head portion 112 may be further improved.

On the other hand, a predetermined section of the inner circumferential surface of the sealing coupling portion 131 of the insert 130 is tapered so as to gradually decrease in diameter from the support groove 133 to the liner 110 body portion 111 side, and the sleeve 140 . ), a predetermined section of the outer peripheral surface of the close coupling portion 141 is tapered so that the diameter gradually decreases from the support protrusion 142 to the liner 110 body portion 111 side, whereby the close coupling portion 141 of the sleeve 140 is formed. ) to be inserted and fastened to the sealing coupling portion 131 of the insert 130 .

Here, when the close coupling part 141 of the sleeve 140 is inserted into the sealing coupling part 131 of the insert 130, the outer peripheral surface of the sleeve 140 close coupling part 141 tapered for a predetermined section is formed. The starting diameter and the ending point diameter are formed to be larger than the starting diameter and the ending point diameter of the inner circumferential surface of the sealing coupling part 131 of the insert 130 tapered in a predetermined section by a predetermined length, so that the close coupling portion 141 of the sleeve 140 is formed. It is inserted into the sealing coupling portion 131 of the insert 130 in the form of an interference fit so that it can be coupled.

Therefore, when the close coupling portion 141 of the sleeve 140 is inserted into the tight coupling portion 131 of the insert 130 in the form of interference fit and coupled, the close coupling portion 141 of the sleeve 140 is By this, the sealing coupling portion 131 of the insert 130 is extended and pressed toward the head portion 112 and is in close contact, thereby further improving the sealing property between the insert 130 and the sleeve 140 as well as the insert 130 of the insert 130 . Even the sealing properties between the close coupling portion 131 and the head portion 112 can be further improved.

In addition, in the support groove 133 of the insert 130 and the support protrusion 143 of the sleeve 140, respectively, the tapered portion 135, the diameter of which gradually decreases toward the body portion 111 of the liner 110 ( When the support protrusion 142 is inserted and seated in the support groove 133 by inserting and fastening the sleeve 140 inside the insert 130, the support groove 133 is formed as a head by the support protrusion 142. By making it pressurized toward the part 112 , even the sealing property between the support groove 133 and the support protrusion 142 can be significantly improved.

In addition, the sealing ring 145 is coupled to the sealing ring coupling groove 143 provided on the outer circumferential surface of the close coupling portion 141 of the sleeve 140 inserted into the insert 130 so that the sleeve 140 is inserted into the insert 130 . ) When inserted and coupled to the inside, a plurality of sealing rings 145 are interposed between the sleeve 140 and the insert 130 so that the sealing property between the sleeve 140 and the insert 130 can be further improved. .

When the sleeve 140 is inserted and fastened into the insert 130 as described above, and the pressure coupling member 150 is screwed to the head part 112, the pressure protrusion of the pressure coupling member 150 ( 152) to further improve the adhesion between the sleeve 140 and the insert 130 by allowing the sleeve 140 to be pressed into the insert 150 side, as well as the sleeve 140 and the sleeve 140 by the pressing protrusion 152. The insert 130 is supported to prevent separation of the sleeve 140 .

At this time, the sleeve 140 facing the pressing protrusion 152 and between the end of the insert 130 and the pressing protrusion 152 are pressed by the pressurizing protrusion 152, so that the sleeve 140 and the insert 130 are pressed. By interposing the sealing packing 153 pressurized to the end portion, the airtightness between the sleeve 140 and the insert 132 and the airtightness between the sleeve 140 and the insert 130 end and the pressure protrusion 152 are further improved. make it possible to improve

In addition to this, the pressure coupling member 150 further includes a close contact wing portion 157 provided at the end of the outer peripheral surface of the pressure coupling body 151 to screw the pressure coupling member 150 to the head portion 112 . When this is done, the close contact wing portion 157 is press-contacted to the body portion 111 of the liner 110 located around the head portion 112 , thereby greatly improving the sealing property between the head portion 112 and the pressure coupling body portion 151 . make it possible

As described above, in the low-pressure gas storage tank 100 according to an embodiment of the present invention, the insert 130 made of a metal material during injection molding of the liner 110 itself is a double injection type by the head part 112 . It is coupled to be integrated with the liner 110 so as to be wrapped so that it is possible to fundamentally prevent an undercut phenomenon from occurring in the head part 112 when the liner 110 is injection molded and cooled. It is possible to prevent a gas leakage phenomenon due to a decrease in airtightness between the head portion 112 and the sleeve 140 due to the undercut phenomenon.

In addition, the multiple sealing between the head part 112 and the insert 130 and between the sleeve 140 and the insert 130 prevents the low-pressure gas stored in the body part 111 from leaking to the outside. let it be

In addition, even if a torsional load is applied to the pressure coupling member 150 by an external force, such as a valve attachment/detachment, and the torsional load is transmitted to the insert 130, the insert 130 is not twisted because the insert 130 and By preventing even the interface of the head part 112 from being separated from each other, it is possible to fundamentally prevent the leakage of the low-pressure gas stored in the body part 111 to the outside.

Therefore, in the low-pressure gas storage tank 100 of the multi-pressurization structure according to an embodiment of the present invention, the low surface energy of the liner 110 manufactured using a synthetic resin such as high-density polyethylene and a decrease in elasticity due to repeated use for a long time occurs. Even if it is, the phenomenon of fine separation of the interface between the junction of the metallic insert 130 and the synthetic resin liner 110 does not occur, so that it is possible to completely prevent external leakage of low-pressure gas. , it has the advantage of significantly improving product reliability and customer satisfaction.

In the detailed description of the present invention described above, although it has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the art will have the spirit of the present invention described in the claims to be described later. And it will be understood that various modifications and variations of the present invention can be made without departing from the technical scope.

(110): liner (120): composite material layer
(130): insert (131): sealing joint
(132): sealing thread (133): support groove
(134): rotation prevention groove portion (135) (144): tapered portion
(140): sleeve (141): close coupling
(142): support protrusion (143): sealing ring coupling groove
(150): pressure coupling member (151): pressure coupling body portion
(152): pressure protrusion (153): sealing packing
(154): first threaded portion (155): second threaded portion
(156): threaded portion (157): sealing wing portion

Claims (9)

a liner formed by injection molding so that a head capable of injecting a low-pressure gas into the body from the outside is provided in the body;
an insert that is coupled to the liner so as to be integrally formed with the liner during injection molding of the liner in a form wrapped by the head portion to prevent undercutting of the inner circumferential surface of the head portion when the liner is cooled;
a sleeve inserted into the insert and coupled to the insert in a press fit form; and
It is screwed to the outer circumferential surface of the head part, and as it is screwed to the outer circumferential surface of the head part, the sleeve is pressed to the insert side, thereby gradually increasing the pressure and adhesion between the inner circumferential surface of the insert and the outer circumferential surface of the sleeve. ,
The insert is
The outer circumferential surface is wrapped by the head portion, and the liner is integrally coupled to the liner during injection molding to prevent undercut from occurring on the inner circumferential surface of the head portion when the liner is cooled, and the sleeve is tightened in the form of an interference fit. hermetic coupling;
When the liner is injection-molded, a portion of the head portion surrounding the outer circumferential surface of the hermetic coupling portion is filled in the valley portion, thereby forming a close contact screw portion formed on the outer circumferential surface of the hermetic coupling portion to improve sealing and coupling force with the head portion; and
When the sleeve is inserted into the hermetic coupling part by a predetermined depth or more, the low-pressure gas having a multi-pressurization structure including a support groove formed on the inner circumferential surface of the hermetic coupling part to support the sleeve so that the sleeve is not inserted into the hermetic coupling part by a predetermined depth or more storage tank. delete The method of claim 1,
The insert is
The low-pressure gas storage tank having a multi-pressurization structure further comprising a plurality of rotation preventing grooves provided on the outer peripheral surface of the hermetic coupling part at predetermined intervals to prevent the sealing coupling part from rotating by filling a part of the head part during injection molding of the liner. The method of claim 1,
The sealing coupling portion,
A low-pressure gas storage tank having a multi-pressurization structure, characterized in that a predetermined section of the inner circumferential surface from the support groove toward the liner body is tapered so that the diameter is gradually reduced, and the sleeve is inserted and fastened in an interference fit form. The method of claim 1,
The sleeve is
a close coupling part inserted into the insert and coupled in a press fit shape;
a support protrusion formed to protrude from the outer circumferential surface of the close-fitting portion so that the close-fitting portion is inserted into the insert and the interference fit is completed, supported by the support groove of the insert so that the close-fitting portion is not inserted into the insert by a predetermined depth or more; and
A low-pressure gas storage tank having a multi-pressurization structure including a sealing ring coupling groove portion formed at a predetermined interval on the outer circumferential surface of the close-fitting portion to allow a sealing ring to be interposed between the outer circumferential surface of the close-fitting portion and the inner circumferential surface of the insert. 6. The method of claim 5,
The close coupling portion,
A predetermined section of the outer circumferential surface from the support protrusion toward the liner body is tapered so that the diameter is gradually reduced. A low-pressure gas storage tank of a multi-pressurization structure, characterized in that it is fastened. The method of claim 1,
The pressure coupling member,
a pressure coupling body part screw-coupled to the outer circumferential surface of the head part;
a pressure protrusion formed to protrude on the inner circumferential surface of the pressure coupling body portion and to prevent separation by pressing the sleeve to the insert side and simultaneously supporting the sleeve and the insert as the pressure coupling body portion is screwed to the outer circumferential surface of the head portion; and
A low-pressure gas storage tank having a multi-pressurization structure including a sealing packing interposed between the sleeve and the insert and the pressing protrusion. 8. The method of claim 7,
A low-pressure gas storage tank having a multi-pressurization structure, characterized in that the inner circumferential surface of the pressurizing protrusion is provided with a screw portion to which a safety pin inserted and coupled into the sleeve through the pressurizing protrusion is screwed. 8. The method of claim 7,
The pressure coupling member,
As the pressure coupling body part is screwed to the outer circumferential surface of the head part, the low-pressure gas storage of a multi-pressurization structure further comprising a contact wing part provided on the outer circumferential surface of the pressure coupling body part so as to be press-fitted to the liner body part located around the head part Tank.

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