KR101866021B1 - Pressure container having the liner welding and the manufacture method for the same - Google Patents

Abstract

The present invention includes an insertion member inserted into a liner end of at least two divided liner members forming a pressure vessel, and a joining member extending from the insertion member and having a protruding portion projecting toward the liner member The present invention relates to a laser welded pressure vessel.

Description

Technical Field [0001] The present invention relates to a pressure vessel having a laser welded structure and a method of manufacturing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a pressure vessel storing a high-pressure gas, and more particularly, to a structure of a point where two divided liners are welded together to simplify the production of a composite pressure vessel for storing a high- will be.

In the high pressure hydrogen gas storage container, the liner material of the container is changing to plastic because of the durability to repeated charging in the conventional metal, the relatively low price of the container, and the like. The storage container of such a composite material is provided with a liner which maintains the airtightness of the gas therein. Further, the outer surface of the liner is reinforced with a fiber-reinforced composite material having high strength and non-rigidity in order to cope with the internal pressure due to the compressed gas.

The composite container having such a plastic liner is mainly manufactured by injection molding, blow molding, rotary molding or the like, and there are disadvantages and disadvantages in each manufacturing method. According to the injection molding method, it is necessary to prepare two half liner of different shapes which are formed into two or more parts in the process, and two half liners must be fused to form one body. However, the high-density polymer liner used in the plastic composite pressure vessel must be easily cooled to form a single body by infrared fusion or laser fusion, which is difficult to join with conventional heat fusion method and non-contact type which applies high heat in a short time.

In laser welding, it is important how much heat is transferred to the bonded portion. For this purpose, securing a large area of the bonded portion is more advantageous in terms of heat transfer since it can generate more heat.

Japanese Patent Laid-Open No. 2005-057089 (Mar. 02, 2005)

When irradiating the laser for fusing, press both sides of the two half liner with pressure to give a maximum adhesion force. However, if the pushing force is weak, the fusion can not be performed well, and if the force is excessive, the two products are out of alignment, and a step is generated.

Further, even if the material is fused with a proper force, there is a great possibility that different materials will be deformed depending on thermal deformation and other process characteristics when a liner of a different material is used. Thus, the dimensional stability of the locations where the two liners were fused was inferior and the two liners forming the pressure vessel had to be produced separately.

Due to these factors, it is very difficult to produce a fusion product with a certain quality. Accordingly, the present invention aims at improving the surface adhesion and at the same time, solving the inconvenience of using two different kinds of liner materials.

In order to accomplish the above object, in a preferred embodiment of the present invention, at least two divided liner forming the pressure vessel and an insertion part inserted into the liner end of one of the liner and extending from the insertion part And a welding member having a projecting portion projecting toward the liner side.

Further, the insertion portion of the joining member is inserted into the liner end portion, and one surface of the projecting portion of the joining member, one surface of the insertion portion, and one surface of the liner end are spliced to form a contact surface.

Further, the joining member includes a laser welded pressure vessel having an insertion portion symmetrical to the left and right about the projecting portion.

Further, the liner includes a laser welded pressure vessel having a cylindrical end portion and the joining member has a circular ring shape.

Further, the liner end portion has a shape corresponding to the shape of the projecting portion of the joining member.

Further, the present invention includes a laser welded pressure vessel characterized in that the projecting portion of the joining member is composed of a pair of inclined surfaces symmetrical.

In addition, the joining member can be fastened to the inside or outside of the divided liner in an interference fit manner.

The laser welded pressure vessel may further include a protrusion on the protruding portion of the bonding member, and the protrusion is formed in a latching structure having a latching protrusion.

The laser-welded pressure vessel is characterized in that the protrusion is formed in a circular shape.

Further, the liner includes a laser welded pressure vessel, wherein the liner comprises a transmissive layer through which the irradiated laser light is transmitted, and the bonding member comprises an absorbing layer that absorbs the laser.

The laser welding apparatus according to claim 1, further comprising an inner protrusion formed on an inner surface of the liner end portion and a groove formed in an insertion portion of the joining member corresponding to the inner protrusion, .

And a laser welded pressure vessel further comprising an outer projection formed on the liner at an outer portion of the joining member insertion portion.

The laser welded pressure vessel may further include a transparent outer jig which is provided on all or a part of the contact surface between the liner and the bonding member at the time of laser welding, and is removed after fusion is completed.

The laser welded pressure vessel further comprises a carbon fiber composite material layer outside the liner after the liner is fused.

(A) one split liner is placed on the base plate of the pressurizing device; (b) one end of the insertion portion of the joining member is inserted into the one divided liner end portion so that one surface of the projecting portion of the joining member and the liner end (C) another split liner end portion is inserted into the other end of the insertion portion of the joining member so that one surface of the liner end portion opposite to the other surface of the projecting portion of the joining member is seamed to form the shape of the pressure vessel as a whole; (d) pressing the two liners with the joining member centered on both sides in the axial direction of the outer liner of the pressure vessel by an external pressurizing device; (e) pressing the two liner ends, And a step of laser welding and bonding the liner ends and the joining member by fusing to form a laser welded pressure vessel The proposed method is presented.

The step (d) may further include the step of installing an outer jig on all or a part of the outer surface of the liner end and the surface of the joining member contacting portion, wherein after the step (e) Further comprising the step of separating the outer jig after the manufacture of the pressure vessel is completed.

First, by applying the structure using the joining member, it is possible to improve the surface contact force by the insertion portions of the two liner ends and the joining member, so that a pressure vessel of good quality can be manufactured.

Second, grooves may be formed in the joining member to match the protrusions of the liner to regulate the position of the liner upon fusion.

Third, when the protrusion is formed on the upper end of the protrusion of the joint member, it is possible to prevent the lifting phenomenon that the liner rises up on the protrusion of the joint member due to the pressing force pushed from both sides at the time of fusion by the protrusion, have.

Fourthly, because the welding is performed with respect to the area of the joining member, the welded area can be widened, so that the strength of the joining portion can be increased and the stability and durability of the gas storage container can be improved.

Fifth, in the conventional process, each end of the plurality of liners is different, and each of the liners must be injected from a separate mold at the time of welding. However, in the present invention, since a plurality of liner having the same shape of end portions are used, It is expected that the efficiency of the manufacturing process can be increased.

Further, when the transparent outer jig is fused to the outer surface of the contact surface of the liner and the joining member, the liner lifting phenomenon due to the pressure applied from both sides can be prevented by covering the outer surface of the fusion point. Further, since the outer jig can be freely separated after the fusion bonding is completed, the fusion bonding performance can be improved without affecting the subsequent outer carbon fiber binding process.

Fig. 1 is a perspective view of a pressure vessel formed by fusion between two two-parted liners and a joining member according to a preferred embodiment of the present invention,
FIG. 2 is a cross-sectional view showing the fusion structure between the liner end and the insertion portion and the protrusion of the joining member in another embodiment of the present invention,
3 shows another embodiment of the present invention in which a circular protrusion is formed on the upper end of a protrusion of a joining member,
4 shows another embodiment of the present invention in which an inner protrusion is formed at the liner end and a groove is formed on the insertion portion of the liner corresponding to the inner protrusion,
5 shows another embodiment of the present invention in which an outer projection is provided in a joining member insertion portion,
FIG. 6 is a perspective view showing a structure of an outer jig according to another embodiment of the present invention,
FIG. 7 illustrates a pressure vessel manufacturing method and a pressurizing apparatus according to a preferred embodiment of the present invention, as still another embodiment of the present invention.

The present invention relates to a pressure vessel for storing a high-pressure gas, and is an invention relating to a fusing structure of a pressure vessel and a method of manufacturing a laser-welded pressure vessel including a joining member for joining divided liner (11) and divided liner . In the present invention, the term 'laser welded pressure vessel' is used for the sake of convenience of description, but it is preferably a 'result obtained by splicing the liner by laser welding'. For durability and safety to high pressure internal gases, the finished product of the 'composite pressure vessel' may be accompanied by an additional process of winding the carbon fiber onto the outer layer of the liner bonded result. Therefore, it should be noted that the 'laser welded pressure vessel' referred to in the present invention may further comprise a carbon fiber composite material layer on the outside thereof.

Hereinafter, a fusing structure of a composite container liner according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, a plurality of divided liner (11) capable of forming one pressure vessel and an insertion part (14) inserted into a liner end (12) of any one of the liner Wherein the joining member is inserted into the liner end portion (12), and one surface of the projecting portion (13) of the joining member, one surface of the insertion portion (14) The laser welded pressure vessel may be provided such that one surface of the laser welded portion 12 is interlaced to form a contact surface.

Fig. 1 shows the appearance and welding position of a pressure vessel formed by fusion between two two-divided liner 11 and a joining member located inside two liner as a preferred embodiment of the present invention.

2 is a cross-sectional view internally showing a fusing structure between the liner end 11 and the insertion portion 14 and the projecting portion 13 of the joining member according to another embodiment of the present invention. The shape of the liner end 12 may be configured such that the outer side length and the inner side length are different from each other and the end has a gradient.

Preferably, as shown in FIG. 2, the length of the outer side of the liner end portion 12 is made longer when the joining member is located inside, so that a space is formed inside the liner when the two liner end portions 12 are in contact with each other . Further, when the joining member is located on the outer side, the length of the inner side of the liner end portion 12 may be made longer so that the space is formed outside the liner when the two liner end portions 12 abut one another. The projecting portion 13 of the joining member can be matched to the space formed. Further, the shape of the projecting portion 13 of the joining member and the shape of the liner end portion 12 can be matched to each other for complete close contact.

The shape of the joining member can be designed corresponding to the shape of the pressure vessel to be made. Preferably, the liner, i.e., the pressure vessel, is cylindrical, and the joining member may be formed in a ring shape. Further, the joining member may be located inside or outside the liner. However, when it is provided on the outside, the joining member may be formed to protrude from the liner surface, and may be located on the inside of the liner, which is not aesthetically inadequate.

More preferably, the joining position of the two liner and the joining member can form a central portion of the pressure vessel, and the two liner end portions 12 can be symmetrical and correspond to the projecting portion 13 of the joining member, The shape may also consist of a pair of symmetrical bevels. In another embodiment of the present invention, the shape of the projecting portion 13 of the joining member may be a wedge shape having a gradient. Further, the insertion portion 14 of the joining member may have a shape symmetrical to the left and right about the projecting portion 13.

Meanwhile, according to a preferred embodiment of the present invention, the joining member can be fastened to the inside or outside of the divided liner 11 in an interference fit manner. For this purpose, the circumferential length of the component located inside the liner and the joining member may be made slightly larger than the circumferential length of the externally located component. In order to facilitate interference fit, the insertion portion 14 of the joining member can be made thinner toward the end of the joining member. Furthermore, there is no limitation on the shape of the liner and the joining member as described above, and the formed pressure vessel can be designed to be suitable for the structure or position to be used later. It should be noted, however, that the shape of the insertion portion 14 of the joining member and the shape of the liner end portion 12 must match each other so that they can be fitted later.

Further, the projection 15 may be formed on the upper side of the joining member projecting portion 13. The protrusion 15 may have a concave shape in which the longest edge or diameter B of the projection has a larger diameter than the shortest length C of the projection, and a portion below the projection, that is, a point connecting the projection and the upper end of the projection. And a latching structure having a latching end to which the liner end can be caught can be formed in the groove recessed by the projection. In the latching structure, the liner can not withstand the external force due to the pressing force pushing the liner at both sides during laser welding, Or to prevent lifting along the cross section of the joint member from the outside. As a result, the liner and the joining member can be more closely contacted and an excellent fusion-bonding performance can be ensured. Fig. 3 is a view showing that the diameter B of the projecting end face is longer than the shortest length C of the end face of the projecting portion of the joining member, and the groove formed concavely with the engaging protrusion is formed. The shape of the protrusion 15 is not limited, but a circular protrusion may be formed as another embodiment of the present invention.

On the other hand, in the conventional laser welding method, the cross-section where the two liner are joined is arranged in a diagonal line rather than a right angle to widen the joint surface, and the two liners are made of different colors, i.e., transparent colors for transmitting the laser and opaque And a transparent layer and an absorbing layer are formed. The reason why the two materials are configured differently is that the laser beam must pass through the permeable layer to absorb the laser from the absorbing layer to generate heat, and the cross-section is formed in a diagonal line to have excellent heat transfer capability, Is required. However, according to the conventional method, since the cross section is arranged diagonally, the two liner can not have the same shape.

In a preferred embodiment of the present invention, the laser can be irradiated outside the pressure vessel along the fusing point of the liner and the joining member, that is, along the liner end 12. At this time, the liner may be constituted by a transmissive layer through which laser is transmitted, and the bonding member may be constituted by an absorbing layer which absorbs laser. Further, the liner (transparent layer) is transparent in color and the joining member (absorbing layer) is made different in opaque color so that when the laser is irradiated, it passes through the transparent layer and is absorbed in the absorbing layer to generate heat. The liner and the joining member can be welded to each other by the generated heat. With this configuration, the present invention can take advantage of the advantages of the prior art, while having the advantage that the shape of both liner ends 12 can be made the same as described above, and no liner is required to be produced separately.

4 shows another embodiment of the present invention in which the inner protrusion 16 can be formed on the inner surface of the liner end portion and the groove 17 can be formed on the insertion portion of the liner corresponding thereto Fig. When the inner protrusion 16 of the liner end portion and the groove 17 of the insertion member insertion portion are fastened together, the liner and the joining member can be integrated to prevent the liner and the joining member from acting separately when being pressed from the outside for fusion.

5 is a view showing an outer protrusion 18 formed on the liner of the outer portion of the joining member insertion portion according to another embodiment of the present invention. When the joining member is sandwiched between the outer projections 18, the liner and the joining member are forced to be integrated as in the case of Fig. Therefore, even if the pressing is performed at the time of fusion, the liner and the joining member can be fixed so as not to be able to behave individually, and the fusion performance can be improved.

4) formed on the liner end and the outer protrusion 18 (FIG. 5) formed on the liner of the outer portion of the joining member insertion portion are formed on the inner side or outer side of the liner And may be partially or selectively formed discontinuously along the side surface. In this case, it can be seen that FIG. 4 or FIG. 5 shows an irregular cross section of the inner projection and the outer projection.

As another embodiment of the present invention, an outer jig 19 may be further included as shown in FIG. The outer jig 19 may be provided on all or a part of the outer surface of the contact surface between the liner and the joining member during laser welding. Further, after the fusion is completed, the outer jig 19 may be removed. Preferably, the outer jig 19 may be made of a transparent material having excellent laser transmittance so as not to affect laser irradiation between the liner and the joining member. More preferably, if the liner is circular, it may be formed into an arc shape or an annular shape along the outer periphery. It is possible to prevent both liner from being lifted from the joining member in spite of the pressing force for pushing the liner at both sides when the outer jig fuses. In addition, since the outer jig can be detached or adhered to the pressure vessel, it can be installed at the time of laser welding, and can be removed after completion of fusion to separate the outer jig 19 separately. Therefore, subsequent processes such as external carbon fiber winding may not be affected.

Further, after the laser welding is completed, a carbon fiber composite material may be further formed outside the laser welded liner. Preferably, the filament winding operation forms a carbon fiber composite layer outside the liner and cures to finally form the composite pressure vessel. More preferably, the carbon fiber filaments are wound continuously while applying tension to the liner surface, and then cured through heating to produce a finished product, that is, a composite pressure vessel.

Hereinafter, as another embodiment of the present invention, a method of manufacturing a laser welded pressure vessel will be described with reference to FIG. According to a preferred embodiment of the present invention, a pressurizing device 21 is presented for the production of a pressure vessel, preferably a device for pressurization at both ends, a base plate 23 for placing the divided liner and joining member . More preferably, the base plate 23 has a roller and the liner or the pressure vessel can freely move on the plate by the rotation of the roller. Further, a single or plural laser irradiation devices 22 for laser irradiation may be configured.

One split liner 11 is positioned on the base plate 23 of the pressurizing device and one end of the insertion portion 14 of the joining member is inserted into the liner end portion 12 positioned so that the projecting portion 13 of the joining member is inserted, So that one side of the projecting portion 13 of the joining member, one side of the insert portion 14 and one side of the liner end 12 are adhered to each other to form a contact surface, .

The other divided liner end portion 12 can be inserted until the other surface of the end portion of the other liner is seamed to the other surface of the projecting portion 13 of the joining member at the other end of the joining member insertion portion 14. [ As a result, the two liners and the joining members can be fitted into the shape of the pressure vessel.

The center of the left side and the center of the right side of the outside of the liner which are placed on the base plate 23 by the external pressurizing device 21 (hereinafter, the direction of the line connecting the left center and the right side center is referred to as' So that the member presses the two liner fitted in the middle.

The laser is irradiated along the surface where the two liner ends and the insertion portion 14 of the joining member are seamed in a state in which the pressurization is maintained, and preferably the plurality of liner and the joining members The laser can be irradiated onto the entire outer surface of the cylindrical liner end portion and the insertion portion 14 of the joining member.

As a result, a laser may be irradiated along the surface where the two liner ends and the inserting portion of the joining member are seamed, so that the liner ends and the joining member can be joined by fusion. More preferably, after forming the pressure vessel by sandwiching the two liner end portions and the joining member insertion portion 14, the liner end portion 12 and the joining member insertion portion 14 are fused The outer jig 19 may be provided to prevent the seal liner from being lifted.

The outer jig 19 may be configured to be detachable or attachable as described above, so that the outer jig 19 may be separated after the manufacture of the pressure vessel is completed.

Further, the pressure vessel described as a preferred embodiment of the present invention is not limited to the drawings and examples, and a predetermined member may be inserted into the inside or outside of the fusion welding point when the divided liner is welded, Or improving the fusion bonding performance of the liner, and further improving the easiness of fusion bonding and shortening the process.

A: Location where the present fusion structure is formed in the pressure vessel
11: Split liner
12: split liner end
13: protrusion of the joining member
14: insertion portion of the joining member
15: projection on the projecting portion of the joining member
16: an inner projection formed on the inner side of the joint surface formed at the end of the divided liner
17: a groove formed in the joining member insertion portion corresponding to the inner projection
18: outer protrusion formed on the liner of the outer portion of the joint member insertion portion
19: Outer jig
21: Pressure device
22: laser irradiation device
23: base plate of pressurizing device
B: Diameter of projecting section
C: the shortest length of the cross-section of the joint member projection

Claims (16)

At least two split liners forming a pressure vessel;
An engaging member inserted into the liner end of any one of the liner and a protruding portion extending from the inserting portion and protruding to the liner side, the joining member being formed to correspond to the shape along the end of the liner outer circumference;
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Wherein the liner end portion is configured such that the outer side length and the inner side length are different from each other and the end portion has a gradient, and the projecting portion of the joining member is formed into a wedge shape having a gradient,
Wherein an inner protrusion is further formed on the inner surface of the liner end portion, a groove is further formed in the insertion portion of the joining member corresponding to the inner protrusion, and the inner protrusion and the groove are fastened together.
2. The laser-welded pressure vessel according to claim 1, wherein the insertion portion of the joining member is inserted into the liner end portion, and one surface of the projecting portion of the joining member, one surface of the insertion portion, . The laser-welded pressure vessel according to claim 1, wherein the liner end portion has a shape corresponding to the shape of the projecting portion of the joining member. The laser welded pressure vessel of claim 1, wherein the liner has a cylindrical end and the joining member is in the form of a circular ring. The laser-welded pressure vessel according to claim 1, wherein the projecting portion of the joining member is made of a symmetrical pair of inclined surfaces. The laser-welded pressure vessel according to claim 1, wherein the joining member has an insertion portion that is symmetrical about the projection. The laser-welded pressure vessel according to claim 1, wherein the joining member can be fastened to the inside or the outside of the liner in an interference fit manner. The connector according to claim 1, further comprising: projections on the joint member projection;
Wherein the projections are formed in a latching structure having a latching jaw. The laser-welded pressure vessel according to claim 8, wherein the projections are formed in a circular shape. The laser-welded pressure vessel according to claim 1, wherein the liner comprises a transmissive layer for transmitting the irradiated laser light and the bonding member comprises an absorbing layer for absorbing the laser. delete The connector according to claim 1, further comprising: an outer protrusion formed on the liner at an outer portion of the joint member insertion portion;
Further comprising a laser-welded pressure vessel. The transparent outer jig as set forth in claim 1, wherein the transparent outer jig is provided on all or a part of the contact surface between the liner and the joining member at the time of laser welding, and is removed after fusion is completed;
Wherein the laser-welded pressure vessel can further include a laser-welded pressure vessel. 2. The laser welded pressure vessel of claim 1, further comprising a carbon fiber composite material layer outside the liner after the liner is fused. (a) placing one divided liner over a base plate of a pressurizing device;
(b) one end of the insertion part of the joining member is inserted into the one end of the divided liner part so that one surface of the projecting part of the joining member, one surface of the insertion part and one surface of the liner end are spliced to form a contact surface, The side lengths are different from each other so that the end has a gradient, and the projecting portion of the joining member is formed into a wedge shape having a gradient to form a contact surface;
(c) another divided liner end portion is inserted into the other end of the insertion portion of the joining member so that one surface of the liner end portion opposite to the other surface of the projecting portion of the joining member is seamed to form the shape of the pressure vessel as a whole;
(d) pressing the two liners sandwiched between the joining members at both sides of the pressure vessel outer liner axis by an external pressurizing device;
(e) a laser is irradiated along the surface where the two liner ends and the insertion member of the joining member are seamed to bond the joining members with the liner ends by fusion;
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The joining member includes a protruding portion protruding to the liner side and is formed to correspond to a shape along the end surface of the liner outer surface,
In the step (b), an inner protrusion is further formed on the inner surface of the liner end, a groove is further formed in the insertion portion of the joining member corresponding to the inner protrusion, and the inner protrusion and the groove are fastened Wherein the laser-welded pressure vessel is made of a thermoplastic resin. 16. The method of claim 15, further comprising: prior to step (d), providing an outer jig to all or a portion of the outer surface of the liner end and the joining member insert;
Further comprising: after the step (e), separating the outer jig after completion of the production of the laser welded pressure vessel;
Further comprising the steps of: providing a laser-welded pressure vessel;

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