KR20230073426A - pressure vessel - Google Patents

Abstract

To improve a sealing performance, the present invention provides a pressure vessel which comprises: an upper liner unit having an upper side engaged with an outer side of a boss unit with a vertically extended penetrating hole by insert molding, and cylindrically extended downward from an upper side and opened on a lower center part to form a first storage space storing a fluid inside, and having a first coupling unit formed on a lower end edge to have a first overlapped engagement surface vertical from a laser irradiation direction to be vertically extended in a circumferential direction; a lower liner unit arranged on a lower side of the upper liner unit, and having a second coupling unit formed on an upper end edge to have a second overlapped engagement surface vertical from a laser irradiation direction to be vertically extended in a circumferential direction, and having a second storage space inside to communicate with the first storage space; and a ring bracket unit melted and engaged with the part between the first coupling unit and the second coupling unit by being extended in a ring shape in a circumferential direction and laser-welded, and having a first facing coupling surface formed on an upper side to come in surface-contact and coupled with the first overlapped engagement surface, and having a second facing coupling surface formed on a lower side to come in surface-contact and coupled with the second overlapped engagement surface.

Description

pressure vessel {pressure vessel}

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

In general, a gas storage container is required to store various types of gas such as hydrogen, nitrogen, and natural gas, and to discharge the stored gas as needed. In particular, since gas has a low storage density in a container, it needs to be stored at a high pressure, and a pressure container is essential to use in such a high-pressure environment.

For example, alternative fuel gas vehicles including fuel cell vehicles or compressed natural gas vehicles have different storage system structures depending on the fuel gas storage method. Storage methods are gaining popularity. However, gaseous fuel has a low energy storage density, so 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, so safely storing higher-pressure gas is the key to tank technology.

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 the compressed gas, and a liner is installed inside to maintain gas tightness. is inserted At this time, the fuel gas storage tank is divided into shapes according to the material of the liner, and a tank with a metal liner such as aluminum inserted is classified as a type 3 and a tank with a high-density polymer liner inserted as a type 4.

In detail, in the case of type 3, the stability is relatively high, but it is expensive and has poor fatigue resistance, while the type 4 tank is cheaper than type 3 and has excellent fatigue resistance, but hydrogen leakage and There are safety issues such as poor permeation resistance. In particular, since the metal nozzle used for mounting the external valve and the plastic material of the body are different, the airtight integrity of the boss extension is important.

Here, the upper liner constituting the upper part of the pressure vessel and the lower liner constituting the lower part of the liner made of a high-density polymer material are separately manufactured and fused to each other.

However, the conventional liner has a serious problem in that gas such as hydrogen stored in the pressure container leaks through a gap formed between the fusion-bonded upper liner and lower liner.

Therefore, there is an urgent need for research into improving bonding strength between liners to prevent non-ideal outflow of the fluid filled therein.

Korean Patent Registration No. 10-1806643

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 inserted and coupled to the outside of the boss portion in which the upper through hole extends in the vertical direction, and extends downward in a cylindrical shape from the upper portion to form a first accommodation space in which fluid is accommodated. an upper liner portion having a lower center opening, and a first overlapping coupling surface perpendicular to the laser irradiation direction at the lower rim extending in the vertical direction along the circumferential direction; It is disposed in the lower part of the upper liner portion, and a second overlapping coupling surface perpendicular to the laser irradiation direction is formed on the upper edge and extends in the vertical direction along the circumferential direction. a lower liner portion in which a second accommodating space is formed; And a first opposing mating surface that is extended in a ring shape along the circumferential direction between the first mating part and the second mating part and melt-bonded by laser welding, and is surface-contacted to the first overlapping mating surface at the upper part. It is formed, and provides a pressure container including a ring bracket portion in which a second opposing mating surface formed in a lower portion is formed in surface contact with the second overlapping mating surface.

On the other hand, in the present invention, the upper portion is coupled by insert injection to the outer edge of the boss portion in which the through hole extends vertically, extending downward in a cylindrical shape from the upper portion to form a first accommodation space for receiving fluid therein, and the lower center is open , An upper liner portion in which a first overlapping coupling surface perpendicular to the laser irradiation direction extends vertically along the circumferential direction on the lower edge, and a first matching portion formed in white so that the laser is transmitted; An upper rim is coupled to the lower rim of the upper liner portion, and a second overlapping coupling surface is formed extending vertically along the circumferential direction so that the upper rim overlaps in the radial direction from the first overlapping coupling surface and makes surface contact, and the laser is transmitted. a lower liner part in which a second matching part is formed, preferably in white, and a second accommodating space communicating with the first accommodating space is formed therein; And between the first matching portion and the second matching portion, it extends in a ring shape along the circumferential direction and is melt-bonded by laser welding, but is provided in black so that the laser is transmitted from the outside in the radial direction along the circumferential direction to reach the upper part and a coupling extension ring portion having first and second opposing coupling surfaces formed on a lower outer surface thereof, respectively, in surface contact with the first overlapping coupling surface and the second overlapping coupling surface and melt-bonded by laser irradiation, respectively. A protruding extension portion integrally extending from the center of the outer surface of the extension ring toward the outer side in the radial direction, and the ends of the first matching portion and the second matching portion being surface-contacted on the upper and lower surfaces, and bent from the outer end of the protruding extension portion Provided is a pressure container including a ring bracket portion including an extension extension portion that encloses the ends of the first and second matching portions and extends and protrudes integrally in a vertical direction.

In addition, the present invention is inserted and coupled to the outer edge of the boss portion in which the upper through hole extends in the vertical direction, and extends downward in a cylindrical shape from the upper portion to form a first accommodation space for receiving fluid therein, and the lower center is opened , The first overlapping coupling surface perpendicular to the laser irradiation direction is formed on the lower edge extending vertically along the circumferential direction, and the laser is transmitted from the outside in the radial direction along the circumferential direction. A first joint portion provided in black is formed. an upper liner portion; An upper rim is coupled to the lower rim of the upper liner portion, and a second overlapping coupling surface is formed extending vertically along the circumferential direction so that the upper rim overlaps in the radial direction from the first overlapping coupling surface and makes surface contact. a lower liner portion in which a second matching portion provided in black is formed so that the laser is transmitted from the outside in the radial direction and a second accommodating space communicating with the first accommodating space is formed therein; And it extends in a ring shape along the circumferential direction between the first matching portion and the second matching portion and is melt-bonded by laser welding, but provided in white color so that the laser is transmitted, and the first overlapping coupling surface on the upper and lower inner surfaces. And a coupling extension ring portion in which the first and second opposing coupling surfaces are formed in surface contact with the second overlapping coupling surface and melt-bonded by laser irradiation, and toward the inner side in the radial direction from the center of the inner surface of the coupling extension ring portion A protruding extension portion extending integrally and having ends of the first matching portion and the second matching portion being surface-contacted and molded to upper and lower surfaces, and the first matching portion and the second shape bending from the inner end of the protruding extension portion. Provided is a pressure vessel including an extension extension portion that surrounds an end portion of the joint portion and integrally bends and protrudes in an upward and downward direction.

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

First, if one of the matching parts and ring brackets provided with a color having a higher brightness than the other one disposed in the radial direction overlaps along the radial direction, each of the matching parts and ring brackets The laser, which has high brightness and has penetrated one of the outermost parts in the radial direction, is absorbed and heated by the surface contact area with the other one of the molded part and the ring bracket part, which has a low brightness and is arranged in the inner part in the radial direction. Since it is performed precisely, work convenience can be remarkably improved.

Second, the first overlapping coupling surface and the second overlapping coupling surface formed perpendicular to the laser irradiation direction at each end of the upper liner portion and the lower liner portion have the first and second opposing coupling surfaces of the ring bracket along the radial direction. Since the welding joint area is formed uniformly by overlapping and surface contact, the sealing performance can be remarkably improved.

Third, since the protruding extension part integrally extending from the center of the coupling extension ring part of the ring bracket part and the extension extension protruding in a curved manner from the end of the protruding extension part are matched to each end of the first and second matching parts, when welding The flow is minimized, the bonding area is formed uniformly, and the manufacturing precision can be remarkably improved.

Fourth, the first overlapping coupling surface and the first opposing coupling surface, and the second overlapping coupling surface and the second opposing coupling surface generate a reaction force by the pressure due to the expansion of the fluid stored inside the pressure container, and press in opposite directions. According to the close contact, the sealing force can be remarkably increased.

Fifth, the first overlapping coupling surface and the first opposing jointing surface, and the second overlapping coupling surface and the second opposing coupling surface are in surface contact with each other and are formed extending vertically along the circumferential direction and formed perpendicular to the laser irradiation direction, so welding Since an additional device for tilting the laser for bonding is not required, work convenience and productivity can be remarkably improved.

1 is a front view showing a pressure vessel according to an embodiment of the present invention;
2 is a cross-sectional view showing a pressure vessel according to an embodiment of the present invention.
3 and 4 are perspective views showing a ring bracket of a pressure vessel according to an embodiment of the present invention.
5 is a cross-sectional view showing a boundary area between an upper liner part, a ring bracket part, and a lower liner part in a pressure vessel according to an embodiment of the present invention.
6 is a perspective view showing a modified example of a ring bracket part of a pressure vessel according to an embodiment of the present invention.
7 is a cross-sectional view showing a modified example of a boundary region between an upper liner part, a ring bracket part, and a lower liner part 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 cross-sectional view showing a pressure vessel according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a boundary region between an upper liner part and a lower liner part in a pressure vessel according to an embodiment of the present invention.

As shown in FIGS. 1 and 2 , a pressure vessel 700 according to an embodiment of the present invention includes an upper liner part 710 , a lower liner part 720 and a ring bracket part 730 .

Here, the pressure container 700 is a container 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 700 at a high pressure of 700 bar.

On the other hand, it is preferable that the boss portion 10 includes a boss extension portion provided in a cylindrical shape and having through holes 12 penetrating the central portion along the vertical direction. In addition, the boss portion 10 includes a boss flange portion that integrally extends radially outward along the circumferential direction at the lower portion of the boss extension portion and extends the through hole 12 vertically in the radially inner side. desirable.

Here, it is preferable to understand that the boss extension part and the boss flange part are integrally formed with each other, the boss extension part is formed on the upper side of the boss part 10, and the boss flange part is formed on the lower side of the boss part 10. do. At this time, the outer surface of the boss extension part is depressed inward in the radial direction along the circumferential direction as it goes from the upper end to the boundary area with the lower boss flange part, and may be formed concave in a rounded shape.

In addition, the upper surface of the boss flange portion may be formed in a form extending outward in a radial direction along a circumferential direction toward a lower end from a boundary region with the boss extension portion at an upper portion. Here, the boss portion 10 including the boss extension portion and the boss flange portion may be manufactured by processing steel or aluminum, and the material is not limited thereto.

In addition, the through hole 12 may be formed through the inside of the boss extension part and the boss flange part along the vertical direction, and the upper end is opened to the outside and the lower end is the first inner part of the upper liner part 710. It is preferable to communicate with the receiving space 710a.

In addition, the through hole 12 is screwed with an external device (not shown) when the fluid is introduced into the pressure container 700 and the fluid is discharged to the outside of the pressure container 700, so that fluid leakage is prevented. A screw thread may be formed on the inner circumferential surface.

On the other hand, the upper liner portion 710 is preferably provided in the form of a container with an open bottom, so that the first accommodating space 710a communicating with the through hole 12 is formed so that the fluid can be accommodated therein. In addition, the upper liner part 710 is preferably insert-injected along the lower surface of the boss flange part to be hermetically coupled.

Also, the lower liner part 720 is preferably provided in the form of a container with an open top, so that a second accommodation space 720a communicating with the first accommodation space 710a is formed so that the fluid can be accommodated therein. In addition, the lower liner part 720 is preferably insert-injected along the upper surface of the boss tail part 210 to be hermetically coupled. In this case, the boss tail part 210 may be made of the same material as the boss part 10 and may be provided to seal the lower part of the pressure container 700 . Of course, the boss tail part 210 may be provided with substantially the same material as the boss part 10, but there may be a slight difference in additives between each material, and it is preferable to understand that this is included in the scope of the present invention. .

Here, the upper liner part 710 and the lower liner part 720 may be made of a synthetic resin material different from that of the boss part 10 and the boss tail part 210 . At this time, the manufacturing process of the upper liner part 710 will be described as an example. Here, it is preferable to understand that the manufacturing process of the lower liner part 720 is substantially the same as that of the upper liner part 710 . For example, the boss part 10 is inserted between an upper mold (not shown) and a lower mold (not shown), and the boss part 10 is inserted between the upper mold (not shown) and the lower mold (not shown). A separation space (not shown) communicating with may be formed. Subsequently, as synthetic resin is injected into the separation space (not shown) and cured, the upper liner part 710 may be manufactured by insert injection.

In addition, the upper liner part 710 and the lower liner part 720 may be individually manufactured and coupled to each other through laser welding through the link racket part 730 . At this time, the lower edge of the upper liner part 710 and the upper part of the link racket part 730 are fitted to each other, and the lower part of the link racket part 730 and the upper edge of the lower liner part 720 are mutually fitted. In a coupled and overlapping state, they may be melted and bonded to each other by a laser irradiated from the outside in the radial direction.

In detail, the upper part of the upper liner part 710 is preferably inserted and injected to the outside of the boss part 10 in which the through hole 12 extends in the vertical direction. The upper liner part 710 preferably extends downward in a cylindrical shape from an upper part coupled to the boss part 10 so as to form the first accommodating space 710a in which fluid is accommodated, and has an open lower center. do. At this time, the first accommodating space 710a is formed inside the upper liner part 710 in the radial direction.

In addition, the upper liner part 710 has a first shape fitting part 711 in which a first overlapping coupling surface 711a perpendicular to the laser irradiation direction k1 extends vertically along the circumferential direction is formed at the lower edge of the upper liner part 710. desirable.

At this time, the laser irradiation direction k1 is a radius along the circumferential direction on the outer surface of the boundary region between the lower end of the upper liner part 710, the ring bracket part 730 and the upper end of the lower liner part 720. Direction means the direction in which the laser is irradiated vertically from the outside.

On the other hand, the lower liner part 720 is disposed below the upper liner part 710, and the second overlapping coupling surface 721a perpendicular to the upper edge from the laser irradiation direction (k2) is vertically directed along the circumferential direction. It is preferable that the second matching portion 721 extended to be formed. At this time, the laser irradiation directions indicated by k1 and k2 in FIG. 5 are parallel to each other and are preferably understood as directions perpendicular to the first overlapping coupling surface 711a and the second overlapping coupling surface 721a.

At this time, the first matching portion 711 and the second matching portion 721 may be provided in a mutually symmetrical shape. In addition, the first overlapping coupling surface 711a and the second overlapping coupling surface 721a may be arranged parallel to each other along the circumferential direction.

In addition, it is preferable that the second accommodating space 720a communicating with the first accommodating space 710a is formed inside the lower liner part 720 . At this time, it is preferable that the first accommodating space 710a and the second accommodating space 720a communicate with the inner space in the radial direction of the ring-shaped ring bracket part 730 . In addition, it is preferable that the lower part of the lower liner part 720 is coupled to the outside of the boss tail part 210 by insert injection.

The upper liner part 710, the lower liner part 720, the ring bracket part 730, and the first matching part 711 and the second matching part 721 are provided with the same material as each other. It is desirable to be At this time, it is most preferable that the upper liner part 710, the lower liner part 720, and the ring bracket part 730 are made of a synthetic resin material including polyamide. In addition, the upper liner part 710, the lower liner part 720, and the ring bracket part 730 may be provided with substantially the same material as each other. Of course, it is preferable to understand that the upper liner part 710, the lower liner part 720, and the ring bracket part 730 may have subtle differences in additives between materials, which are included in the scope of the present invention.

On the other hand, the ring bracket part 730 extends in a ring shape along the circumferential direction between the first matching part 711 and the second matching part 712, so that the first matching part 711 and the second matching part 711 It is preferable to be provided so as to be melt-bonded as laser welding to the molded part 712 .

In addition, the ring bracket part 730 has a first opposing type mating surface 730a which is surface-contacted and mold-matched to the first overlapping coupling surface 711a at the upper part, and at the lower part to the second overlapping coupling surface 721a. It is preferable to form a second opposing mating surface 730b that is surface-contacted.

At this time, the first overlapping coupling surface 711a and the first opposing mating surface 730a may each extend along the vertical direction perpendicular to the laser irradiation direction k1 and come into surface contact with each other along the radial direction. In addition, the second overlapping coupling surface 721a and the second opposing mating surface 730b may each extend along the vertical direction perpendicular to the laser irradiation direction k2 and come into surface contact with each other along the radial direction.

Meanwhile, the first matching portion 711 and the ring bracket portion 730 are provided in colors having different brightness, and the second matching portion 721 and the ring bracket portion 730 are provided in colors having different brightness. , and the first matching portion 711 and the second matching portion 721 may be provided in colors having the same brightness. At this time, in the present invention, it is preferable to understand that the first matching portion 711 and the rest of the upper liner portion 710 excluding the first matching portion 711 are provided with the same material and color having the same brightness. . In addition, in the present invention, it is preferable to understand that the second matching portion 721 and the rest of the lower liner portion 720 excluding the second matching portion 721 are provided with the same material and color having the same brightness. .

In addition, each surface contact area between the first overlapping coupling surface 711a and the first opposing coupling surface 730a and the second overlapping coupling surface 721a and the second opposing coupling surface 730b has a circumferential direction. So that the laser is transmitted and reached from the outside in the radial direction along At the same time, one of the second matching part 721 and the ring bracket part 730 disposed on the outer side in the radial direction is provided in a color having a higher brightness than the other one disposed on the inner side in the radial direction. It is desirable to be

Hereinafter, with reference to FIG. 5, a pressure vessel according to an embodiment of the present invention will be described in detail.

In detail, in the pressure vessel according to an embodiment of the present invention, the first overlapping coupling surface 711a and the second overlapping coupling surface 721a are the first opposing mating surface 730a and the second opposing mating surface. Disposed radially outward from (730b), the first matching portion 711 and the second matching portion 721 may be provided with a color having a higher brightness than the ring bracket portion 730. At this time, preferably, the first matching portion 711 and the second matching portion 721 are provided in white, and the ring bracket portion 730 is preferably provided in black.

Here, it is most preferable that the entirety of the upper liner part 710 and the lower liner part 720 is provided with a color having higher brightness than the ring bracket part 730 . Of course, in some cases, only the first matching portion 711 and the second matching portion 721 may be partially provided with a color having higher brightness than the ring bracket portion 730 .

For example, the first matching part 711 and the second matching part 721 may have a white color so that the laser can pass through, and the outer surface of the ring bracket part 730 absorbs heat when the laser is irradiated therethrough. The color may be provided in black so that it is heated and melted. Alternatively, the first matching part 711 and the second matching part 721 may have a transparent color, while the ring bracket part 730 may have a black color.

Through this, the circumferential direction is applied to the first overlapping coupling surface 711a and the second overlapping coupling surface 721a which are in surface contact with the first and second opposing coupling surfaces 730a and 730b, respectively. When the laser penetrates and reaches from the outside in the radial direction, mutual welding may be performed.

Therefore, the first matching portion 711 and the second matching portion 721 provided in white or transparent color having a higher brightness than the ring bracket portion 730 provided in black but made of the same material, Each overlaps with the ring bracket part 730 along the radial direction. Accordingly, the laser transmitted through the first and second opposing cohesive surfaces 730a and 730b which are in surface contact with the first overlapping coupling surface 711a and the second overlapping coupling surface 721a, respectively. When is absorbed and heated, welding is precisely performed, so work convenience can be remarkably improved.

On the other hand, the ring bracket portion 730 extends in a ring shape along the circumferential direction, and is in surface contact with the first overlapping coupling surface 711a and the second overlapping coupling surface 721a on the upper and lower outer surfaces, so that the laser irradiation It is preferable to include a coupling extension ring part 731 in which a melt-bonded region including the first and second opposed-shaped mating surfaces 730a and 730b melt-bonded by

Here, in one embodiment of the present invention, the first opposing mating surface 730a is formed on the upper radially outer outer surface of the coupling extension ring portion 731, and the lower side radially outer side of the coupling extension ring portion 731 The second opposing mating surface 730b may be formed on the outer surface.

Further, the ring bracket part 730 integrally extends from the center of the outer surface of the coupling extension ring part 731 toward the outer side in the radial direction, and the first shape part 711 and the second shape part 721 are formed on the upper and lower surfaces. ) It is preferable that the end portion includes a protruding extension portion 732 that is molded into surface contact.

Here, the upper surface of the protruding extension part 732 is formed to be bent from the lower end of the first opposing molded mating surface 730a, and the lower surface of the protruding extension part 732 is the upper end of the second opposing molded mating surface 730b. It can be formed bent from.

At this time, the lower end of the first matching portion 711 is in surface contact with the upper surface of the protruding extension portion 732, and the upper end of the second matching portion 721 is in surface contact with the lower surface of the protruding extension portion 732. It can be.

In addition, the ring bracket part 730 surrounds the ends of the first mold part 711 and the second mold part 721 bent from the outer end of the protruding extension part 732 and is integrally formed in the vertical direction. It is preferable to include an extension extension 733 that protrudes in a curved manner.

At this time, the upper radially inner inner surface of the extension extension part 733 is formed to be bent from the upper surface of the protrusion extension part 732, and the inner inner surface of the lower side radial direction of the extension extension part 733 is formed to be bent from the protrusion extension part 733. It may be formed to be bent from the lower surface of the portion 732.

Here, each end of the first matching portion 711 and the second matching portion 721 is molded to the ring bracket portion 730 and has a contour corresponding to the contour of the ring bracket portion 730 so as to be in surface contact. It is preferable to be formed bent.

Accordingly, laser melting can be performed in a state where the respective ends of the first matching portion 711 and the second matching portion 721 come into mold surface contact with the ring bracket portion 730 and are fitted, thereby increasing work convenience. This is remarkably improved, and the contact surface between each end of the first matching portion 711 and the second matching portion 721 and the ring bracket portion 730 is formed to be bent multiple times, so that the inside of the pressure container 700 Leakage of the stored fluid can be minimized.

At this time, as in the prior art, if the bonding surface to be melted and bonded by the laser is not set perpendicular to the laser irradiation direction (k1, k2) and is formed to be inclined or tapered, the area to be fused is uneven according to the thickness of the bonding surface during the welding process There was a characteristic that was formed.

On the other hand, in the present invention, the first overlapping coupling surface 711a and the first opposing mating surface 730a, and the second overlapping coupling surface 721a and the second opposing mating surface 730b are radially It is overlapped and surface-contacted along the surface, and is formed perpendicular to the laser irradiation directions (k1, k2). Accordingly, melting between the first overlapping coupling surface 711a and the first opposing coupling surface 730a, and the second overlapping coupling surface 721a and the second opposing coupling surface 730b in surface contact with each other. Since the bonding area is uniformly formed along the vertical direction, sealing performance can be remarkably improved.

In addition, the first overlapping coupling surface 711a and the first opposing mating surface 730a, and the second overlapping coupling surface 721a and the second opposing mating surface 730b are in surface contact with each other and are in circumferential direction. It is formed extending vertically along the laser irradiation direction (k1, k2) and is formed perpendicularly. Therefore, since an additional device for tilting the laser for welding is not required, work convenience and productivity can be significantly improved.

In addition, the first overlapping coupling surface 711a and the first opposing coupling surface 730a, and the second overlapping coupling surface 721a and the second opposing coupling surface 730b are inside the pressure vessel 700. A reaction force is generated by the pressure caused by the expansion of the fluid stored therein, and the sealing force can be remarkably increased as the sealing force is pressurized and brought into close contact in opposite directions. That is, the ring bracket portion 730 is pressed outward in the radial direction by the expansion pressure of the fluid, and the first and second matching portions 711 and 721 are pressed radially inward by the reaction force. can

In addition, the vertical length d2 of the coupling extension ring portion 731 is the radial direction along the circumferential direction in the fusion bonding area including the first and second opposing joint surfaces 730a and 730b. Preferably, it is set to exceed the vertical length d1 of the expansion extension part 733 so that the laser is transmitted and reached from the outside via the first matching part 711 and the second matching part 712. .

In addition, the inside of the pressure vessel 700, that is, the inner surface of the coupling extension ring portion 731 disposed toward the first accommodating space 710a and the second accommodating space 720a, is the first molded part 711 And it is preferable to form a continuous contour on each inner surface of the second matching portion 721 .

In addition, the outer surface of the expansion extension part 733 disposed outside the pressure container 700 is formed in a continuous contour with the outer contours of the first matching part 711 and the second matching part 721. this is preferable

On the other hand, Figure 6 is a perspective view showing a modified example of the ring bracket portion of the pressure vessel according to an embodiment of the present invention, Figure 7 is an upper liner portion, a ring bracket portion and a lower liner portion in the pressure vessel according to an embodiment of the present invention It is a cross-sectional view showing a modified example of the boundary area between parts. In this modified example, other configurations except for the configurations of the first matching portion 1711, the second matching portion 1712, and the ring bracket portion 1730 are the same as those of the above-described embodiment, so a detailed description thereof will be omitted.

As shown in FIGS. 6 and 7 , a pressure vessel 1700 according to a modified example of an embodiment of the present invention includes an upper liner part 1710, a lower liner part 1720, and a ring bracket part 1730.

In detail, in the pressure vessel according to an embodiment of the present invention, the first opposing mating surface 1730a and the second opposing mating surface 1730b of the ring bracket part 1730 are the first of the upper liner part 1710. It is disposed radially outward from the first overlapping coupling surface 1711a formed on the mold matching portion 1711 and the second overlapping coupling surface 1721a formed on the second matching portion 1721 of the lower liner portion 1720, The ring bracket part 1730 may be provided with a color having higher brightness than the first matching part 1711 and the second matching part 1721 .

At this time, preferably, the first matching portion 1711 and the second matching portion 1721 are provided in black, and the ring bracket portion 1730 is preferably provided in white. Here, it is most preferable that the ring bracket part 1730 is provided with a color having higher brightness than the upper liner part 1710 and the lower liner 1720 .

For example, the ring bracket part 1730 may have a white color so that the laser can be transmitted, and the outer surfaces of the first matching part 1711 and the second matching part 1721 absorb heat when the laser is irradiated therethrough. The color may be provided in black so that it is heated and melted. Alternatively, the ring bracket part 1730 may have a transparent color, while the first matching part 1711 and the second matching part 1721 may have a black color.

Through this, the circumferential direction is applied to the first opposing mating surface 1730a and the second opposing mating surface 1730b which are in surface contact with the first overlapping coupling surface 1711a and the second overlapping coupling surface 1721a, respectively. When the laser penetrates and reaches from the outside in the radial direction, mutual welding may be performed.

Therefore, the ring bracket part 1730 provided with a white or transparent color having a higher brightness than the first matching part 1711 and the second matching part 1721 provided in black but made of the same material It overlaps the first matching portion 1711 and the second matching portion 1721 along the radial direction. Accordingly, the laser transmitted through the first overlapping coupling surface 1711a and the second overlapping coupling surface 1721a which are in surface contact with the first and second opposing coupling surfaces 1730a and 1730b, respectively. When is absorbed and heated, welding is precisely performed, so work convenience can be remarkably improved.

On the other hand, the ring bracket portion 1730 extends in a ring shape along the circumferential direction, and is in surface contact with the first overlapping coupling surface 1711a and the second overlapping coupling surface 1721a on the upper and lower outer surfaces, and is exposed to laser irradiation. It is preferable to include a coupling extension ring part 1731 in which a melt-bonding region including the first and second opposed-shaped mating surfaces 1730a and 1730b melt-bonded by

At this time, the first opposing molded surface 1730a is formed on the inner inner surface in the upper radial direction of the coupling extension ring part 1731, and the second opposing molded surface 1730a is formed on the inner inner surface in the lower radial direction of the coupling extension ring part 1731. A convergence surface 1730b may be formed.

In addition, the ring bracket part 1730 extends integrally from the center of the inner surface of the coupling extension ring part 1731 toward the inner side in the radial direction, and the first shape part 1711 and the second shape part 1721 are formed on the upper and lower surfaces. ) It is preferable that the end portion includes a protruding extension part 1732 that is molded into surface contact.

Here, the upper surface of the protruding extension part 1732 is formed to be bent from the lower end of the first opposing molded surface 1730a, and the lower surface of the protruding extension part 1732 is the upper end of the second opposing molded surface 1730b. It can be formed bent from.

At this time, the lower end of the first matching part 1711 is in surface contact with the upper surface of the protruding extension part 1732, and the upper end of the second matching part 1721 is in surface contact with the lower surface of the protruding extension part 1732. It can be.

In addition, the ring bracket part 1730 surrounds the ends of the first mold fitting part 1711 and the second mold fitting part 1721 bent from the inner end of the protruding extension part 1732 and is integrally formed in the vertical direction. It is preferable to include an extension extension 1733 that protrudes in a curved manner.

At this time, the outer surface of the upper radial direction of the extension extension part 1733 is formed to be bent from the upper surface of the protruding extension part 1732, and the outer surface of the lower radial direction of the extension extension part 1733 is formed to be bent from the upper surface of the protruding extension part 1732. It may be formed to be bent from the lower surface of the portion 1732.

Here, each end of the first matching portion 1711 and the second matching portion 1721 is molded to the ring bracket portion 1730 and has a contour corresponding to the contour of the ring bracket portion 1730 so as to make surface contact. It is preferable to be formed bent.

Accordingly, laser melting can be performed in a state where the respective ends of the first matching portion 1711 and the second matching portion 1721 come into mold surface contact with the ring bracket portion 1730 and are fitted, thereby increasing work convenience. This is remarkably improved, and the contact surface between each end of the first matching portion 1711 and the second matching portion 1721 and the ring bracket portion 1730 is formed to be bent multiple times, so that the inside of the pressure container 1700 Leakage of the stored fluid can be minimized.

At this time, as in the prior art, if the bonding surface to be melted and bonded by the laser is not set perpendicular to the laser irradiation direction (k1, k2) and is formed to be inclined or tapered, the area to be fused is uneven according to the thickness of the bonding surface during the welding process There was a characteristic that was formed.

On the other hand, in the present invention, the first overlapping coupling surface 1711a and the first opposing coupling surface 1730a, and the second overlapping coupling surface 1721a and the second opposing coupling surface 1730b are radially It is overlapped and surface-contacted along the surface, and is formed perpendicular to the laser irradiation directions (k1, k2). Accordingly, melting between the first overlapping coupling surface 1711a and the first opposing coupling surface 1730a, and the second overlapping coupling surface 1721a and the second opposing coupling surface 1730b, which are in surface contact with each other. Since the bonding area is uniformly formed along the vertical direction, sealing performance can be remarkably improved.

In addition, the first overlapping coupling surface 1711a and the first opposing mating surface 1730a, and the second overlapping coupling surface 1721a and the second opposing mating surface 1730b are in surface contact with each other and are in circumferential direction. It is formed extending vertically along the laser irradiation direction (k1, k2) and is formed perpendicularly. Therefore, since an additional device for tilting the laser for welding is not required, work convenience and productivity can be significantly improved.

In addition, the first overlapping coupling surface 1711a and the first opposing mating surface 1730a, and the second overlapping coupling surface 1721a and the second opposing mating surface 1730b are inside the pressure vessel 1700. A reaction force is generated by the pressure caused by the expansion of the fluid stored therein, and the sealing force can be remarkably increased as the sealing force is pressurized and brought into close contact in opposite directions. That is, the first matching portion 1711 and the second matching portion 1721 are pressed outward in the radial direction by the expansion pressure of the fluid, and the ring bracket portion 1730 is pressed inward in the radial direction by the reaction force. can Also, the length of the coupling extension ring 1731 in the vertical direction may be set to exceed the length of the extension extension 1733 in the vertical direction.

In addition, the inside of the pressure container 1700, that is, the inner surface of the extension extension part 1733 disposed toward the first accommodating space 1710a and the second accommodating space 1720a side is the first molded part 1711 And it is preferable to form a continuous contour on each inner surface of the second matching portion 1721.

In addition, the outer surface of the coupling extension ring part 1731 disposed outside the pressure vessel 1700 is formed in a continuous contour with the outer contours of the first and second matching parts 1711 and 1721 this is preferable

As described above, the present invention provides first and second matching parts 711 and 1711 and second matching parts 721 and 1721 provided with a color having a higher brightness than the other one disposed on the inner side in the radial direction. When the matching parts and the ring bracket parts 730 and 1730 overlap along the radial direction, the matching parts 711 , 721 , 1711 and 1721 and the ring bracket parts 730 and 1730 are provided in a color with high brightness and have a radius A laser transmitted through one disposed outside the direction is provided in a color with low brightness among the molded parts 711, 721, 1711, 1721 and the ring bracket parts 730, 1730, and is disposed on a surface with the other disposed inside in the radial direction. As the contact area is absorbed and heated, the welding connection is precisely performed, so work convenience can be remarkably improved.

In addition, first overlapping coupling surfaces 711a and 1711a formed perpendicularly to the laser irradiation directions k1 and k2 at each end of the upper liner portions 710 and 1710 and the lower liner portions 720 and 1720 and second overlapping coupling surfaces 711a and 1711a The first opposing mating surfaces 730a and 1730a and the second opposing mating surfaces 730b and 1730b of the ring bracket parts 730 and 1730 are overlapped on the surfaces 721a and 1721a along the radial direction and are in surface contact so as to form a weld joint area. Since it is uniformly formed, the sealing performance can be remarkably improved.

Further, the protruding extension parts 732 and 1732 integrally extending from the center of the coupling extension ring parts 731 and 1731 of the ring bracket parts 730 and 1730, and the protruding extension parts 732 and 1732 extending and protruding from the ends of the protruding extension parts 732 and 1732. Since the extension extensions 733 and 1733 are molded to each end of the first matching portion 711 and 1711 and the second matching portion 721 and 1721, flow is minimized during welding and coupling, so that the joint area is uniformly formed and manufactured. Precision can be significantly improved.

In addition, the first overlapping coupling surfaces 711a and 1711a and the first opposing coupling surfaces 730a and 1730a, and the second overlapping coupling surfaces 721a and 1721a and the second opposing coupling surfaces 730b and 1730b They are in surface contact with each other and are formed extending vertically along the circumferential direction to be perpendicular to the laser irradiation directions (k1, k2). Therefore, since an additional device for tilting the laser for welding is not required, work convenience and productivity can be significantly improved.

In addition, the first overlapping coupling surfaces 711a and 1711a and the first opposing coupling surfaces 730a and 1730a, and the second overlapping coupling surfaces 721a and 1721a and the second opposing coupling surfaces 730b and 1730b A reaction force is generated by the pressure caused by the expansion of the fluid stored in the pressure containers 700 and 1700, and as the pressure vessels 700 and 1700 press and adhere in opposite directions, the sealing force can be remarkably increased.

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

As described above, the present invention is not limited to the above-described embodiments, and it is possible to modify and implement the present invention by those skilled in the art without departing from the scope claimed in the claims of the present invention. And, such modifications fall within the scope of the present invention.

10: boss part 12: through hole
210: Bosse part 710, 1710: Upper liner part
710a: first accommodating space 711, 1711: first fitting part
711a, 1711a: first overlapping coupling surface 720, 1720: lower liner portion
720a: second accommodating space 721, 1721: second fitting part
721a, 1721a: second overlapping coupling surface 700, 1700: pressure vessel

Claims (13)

The upper part is insert-injected and coupled to the outside of the boss part in which the through hole extends in the vertical direction, and extends downward in a cylindrical shape from the upper part to form a first accommodation space in which fluid is accommodated inside, and the lower center is opened, and the lower edge has a laser an upper liner portion formed with a first shape fitting portion in which a first overlapping coupling surface perpendicular to the irradiation direction extends in the vertical direction along the circumferential direction;
It is disposed in the lower part of the upper liner portion, and a second overlapping coupling surface perpendicular to the laser irradiation direction is formed on the upper edge and extends in the vertical direction along the circumferential direction. a lower liner portion in which a second accommodating space is formed; and
The first mating part and the second mating part are extended in a ring shape along the circumferential direction and are melt-bonded by laser welding, and a first opposing mold mating surface which is surface-contact molded to the first overlapping mating surface is formed on the upper part. And a pressure vessel comprising a ring bracket portion in which a second opposing mating surface is formed at the bottom to be surface-contacted to the second overlapping mating surface. According to claim 1,
One of the first matching part and the ring bracket part disposed on the outer side in the radial direction is provided with a color having a higher brightness than the other one disposed on the inner side in the radial direction,
The pressure container, characterized in that one of the second matching part and the ring bracket part disposed on the outer side in the radial direction is provided with a color having a higher brightness than the other one disposed on the inner side in the radial direction. According to claim 2,
The first and second matching parts are provided in white, and the ring bracket is provided in black. According to claim 3,
The ring bracket part
Coupling extension rings extending in a ring shape along the circumferential direction and having fusion bonding regions formed on upper and lower outer surfaces in surface contact with the first overlapping coupling surface and the second overlapping coupling surface to be melted and bonded by laser irradiation;
A protruding extension portion extending integrally from the center of the outer surface of the coupling extension ring portion toward the outer side in the radial direction, and the ends of the first matching portion and the second matching portion are surface-contacted and molded to the upper and lower surfaces;
and an extension extension portion that extends and protrudes integrally in a vertical direction while surrounding the ends of the first shape-matching portion and the second shape-matching portion bent from an outer end of the protruding extension portion. According to claim 4,
The vertical length of the coupling extension ring portion is the vertical length of the extension extension portion so that the laser penetrates and reaches the fusion bonding area from the outer side in the radial direction along the circumferential direction via the first and second matching portions. Pressure vessel, characterized in that set to exceed. According to claim 4,
The inner surface of the coupling extension ring portion is formed in a continuous contour on the inner surface contours of the first and second matching portions,
The outer surface of the extension extension portion is formed in a continuous contour on the outer contours of the first and second matching portions. According to claim 2,
The first and second matching parts are provided in black, and the ring bracket is provided in white. According to claim 7,
The ring bracket part
Coupling extension rings extending in a ring shape along the circumferential direction and having fusion bonding regions formed on upper and lower inner surfaces in surface contact with the first overlapping coupling surface and the second overlapping coupling surface to be melted and bonded by laser irradiation;
A protruding extension portion extending integrally from the center of the inner surface of the coupling extension ring portion toward the inner side in the radial direction, and the ends of the first matching portion and the second matching portion are surface-contacted and molded to the upper and lower surfaces;
and an extension extension part that extends and protrudes integrally in a vertical direction while wrapping around ends of the first shape fitting part and the second shape fitting part bent from the inner end of the protruding extension part. According to claim 8,
The pressure vessel, characterized in that the vertical length of the coupling extension ring is set to exceed the vertical length of the extension extension portion. According to claim 8,
The outer surface of the coupling extension ring is formed in a continuous contour on the outer contours of the first and second matching parts,
The pressure container of claim 1, wherein the inner surface of the expansion extension portion is formed in a continuous contour with the inner surface contours of the first and second matching portions. According to claim 1,
The pressure vessel according to claim 1 , wherein the first fitting part, the second fitting part, and the ring bracket part are made of the same material, but made of a synthetic resin material including polyamide. The upper part is insert-injected and coupled to the outside of the boss part in which the through hole extends in the vertical direction, and extends downward in a cylindrical shape from the upper part to form a first accommodation space in which fluid is accommodated inside, and the lower center is opened, and the lower edge has a laser an upper liner portion in which a first overlapping coupling surface perpendicular to the irradiation direction extends vertically along the circumferential direction and is formed with a first shape portion provided in white so as to transmit laser light;
An upper rim is coupled to the lower rim of the upper liner portion, and a second overlapping coupling surface is formed extending vertically along the circumferential direction so that the upper rim overlaps in the radial direction from the first overlapping coupling surface and makes surface contact, and the laser is transmitted. a lower liner part in which a second matching part is formed, preferably in white, and a second accommodating space communicating with the first accommodating space is formed therein; and
It extends in a ring shape along the circumferential direction between the first matching portion and the second matching portion and is melt-bonded by laser welding, but is provided in black color so that the laser is transmitted from the outside in the radial direction along the circumferential direction, and the upper and Coupling extension ring parts in which first and second opposing coupling surfaces are respectively formed on the outer surface of the lower surface to be in surface contact with the first overlapping coupling surface and the second overlapping coupling surface and melt-bonded by laser irradiation, and the coupling extension A protruding extension part extending integrally from the center of the outer surface of the ring part toward the outer side in the radial direction, and the ends of the first and second matching parts are surface-contacted on the upper and lower surfaces, and the protruding extension part is bent from the outer end of the protruding extension part. A pressure vessel including a ring bracket portion including an extension extension portion that surrounds the ends of the first and second matching portions and protrudes and bends upward and downward integrally. The upper part is insert-injected and coupled to the outside of the boss part in which the through hole extends in the vertical direction, and extends downward in a cylindrical shape from the upper part to form a first accommodation space in which fluid is accommodated inside, and the lower center is opened, and the lower edge has a laser An upper liner portion in which a first overlapping coupling surface perpendicular to the irradiation direction extends vertically along the circumferential direction and is formed with a black first matching portion so that the laser is transmitted and reached from the outside in the radial direction along the circumferential direction;
An upper rim is coupled to the lower rim of the upper liner portion, and a second overlapping coupling surface is formed extending vertically along the circumferential direction so that the upper rim overlaps in the radial direction from the first overlapping coupling surface and makes surface contact. a lower liner portion in which a second matching portion provided in black is formed so that the laser is transmitted from the outside in the radial direction and a second accommodating space communicating with the first accommodating space is formed therein; and
It extends in a ring shape along the circumferential direction between the first matching portion and the second matching portion and is melt-bonded by laser welding, but is provided in white color so that the laser passes through, and the first overlapping coupling surface and A coupling extension ring portion in which first and second opposing coupling surfaces are formed in surface contact with the second overlapping coupling surface and melt-bonded by laser irradiation, and are integrated from the center of the inner surface of the coupling extension ring portion toward the inner side in the radial direction. a protruding extension portion extending to the upper and lower surfaces of which the ends of the first matching portion and the second matching portion are surface-contacted and molded, and the first matching portion and the second matching portion bent from the inner end of the protruding extension portion; A pressure vessel including an extension extension portion that wraps around an end of the and extends and protrudes integrally in a bent upward and downward direction.

Images