KR20170138755A - pressure vessel for industrial process - Google Patents

Abstract

The present invention relates to pressure vessels for industrial processes, which have a hollow part formed therein to improve durability to stably maintain and store high pressure gas and an integral liner made of a synthetic material and having an injection part formed at one side thereof outwardly and to be opened. The pressure vessels comprise: an insert socket unit inserted into and coupled to the inner circumferential surface of the injection part to be fused and fixed, made of a synthetic resin material, and having a stepped penetrated part formed at the central portion thereof to gradually narrow in the inner direction of the integral liner; a nozzle boss unit made of a metal material and coupled to surround the outside of the injection part; an adapter unit made of a metal material, connected to the injection part, and having a stepped insertion part that gradually narrows toward an end thereof so that the outer circumferential surface which is in close contact with the stepped inner circumferential surface of the stepped penetrated part can be formed at an end of a fastening part extending to one side of a head part corresponding to an end surface of the nozzle boss unit; and a sealing unit fastened to a sealing space between the stepped inner circumferential surface of the stepped penetrated part and the outer circumferential surface of the stepped insertion part in a multistage manner.

Description

[0001] The present invention relates to a pressure vessel for industrial process,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure vessel for an industrial process, and more particularly, to a pressure vessel for an industrial process having improved durability for stably holding and maintaining an ultra-high pressure gas used in an industrial process.

Generally, pressure vessels are used to transport liquid or gaseous materials used throughout the industry.

At this time, the pressure vessel is provided with a cylindrical cylinder having a constant radius and a pair of dome parts coupled to both ends of the cylinder, and at one side of the dome part, an opening for gas inflow and outflow, An adapter is provided.

The gas is pressurized in the axial direction and the radial direction from the inside of the pressure vessel as it is provided at a high pressure for increasing the filling amount for one container.

Conventionally, a pressure vessel having a thick outer wall is manufactured on the basis of steel having excellent corrosion resistance so as to minimize damage due to high pressure while preventing corrosion caused by toxic gas.

However, the conventional pressure vessel has a problem that the cost for transporting the gas filled container and the material cost for manufacturing the container itself increase as the weight of the conventional pressure vessel increases due to the thickness of the outer wall.

Further, since the surface roughness of the inner wall surface contacting with the gas in the pressure vessel is high, foreign matter is easily adhered to the inner wall surface during manufacture and use of the pressure vessel, and the purity of the filled gas is lowered due to the adhered foreign matter.

A method for manufacturing the pressure vessel by separating the dome portion and the cylinder so as to facilitate the processing of the inner wall surface has been disclosed.

However, when the dome portion and the cylinder are separated as described above, the inner wall surface can be easily machined, but the durability of the gas filled in the inner portion in the state where the dome portion and the cylinder are integrally fixed is deteriorated there was.

Especially, CNG or CNG When the hydrogen gas is filled, the welded portion is damaged and a serious accident occurs. Therefore, in order to store and transport the gas at ultra-high pressure and stably, the liner of the pressure vessel must be integrally formed.

Thus, the liner was manufactured by a rotary molding process so that the liner of the pressure vessel was integrally formed with no weld portion or joint portion.

However, in the case of rotational molding, since the thickness of the inner wall portion and the thickness of the opening portion are substantially uniform, it is difficult to integrally form a precise sealing structure capable of withstanding ultrahigh pressure on the opening portion side.

Meanwhile, the adapter is fastened to the opening, and multi-stage sealing means is provided to prevent the gas from leaking between the adapter and the opening. At this time, the sealing means includes an O-ring of elastic material which substantially blocks the gas leakage and a backup ring interposed in front of the O-ring so as to prevent the O-ring of the elastic material from being pressed or broken by the pressure of the gas.

The backup ring is formed of a substantially inelastic material so as to withstand the pressure of the gas. In order to firmly adhere the inner circumferential surface or the outer circumferential surface of the backup ring firmly between the opening and the adapter, . That is, the inner circumferential surface or the outer circumferential surface of the backup ring is wrapped so as to be in close contact with the opening portion or the opposite surface of the adapter, and the cut portions at both ends are overlapped with each other.

However, since the cutting portion is formed, it is difficult to prevent the high-pressure gas from leaking into the gap between the cut portions even if the tightening operation of the backup ring is easy, so that the compression or breakage of the O-ring can not be substantially prevented .

However, when the backup ring is integrally formed into a ring shape and fastened, there is a problem that it is inconvenient for fastening because the inner peripheral surface or the outer peripheral surface of the backup ring substantially corresponds to the inner peripheral surface of the opening and the outer peripheral surface diameter of the adapter. That is, as the position where the backup ring is fastened is away from the opening portion or the end portion of the adapter, the fastening interval of the backup ring is increased. Accordingly, when the backup ring is fastened, the inner circumferential surface or the outer circumferential surface may be worn or damaged.

As a result, the backup ring does not substantially protect the O-ring, and thus the pressure resistance of the pressure vessel is significantly reduced.

Furthermore, in the past, sealing grooves have been separately formed in the openings or adapters in order for the sealing means to intervene. As a result, the molding process becomes complicated. Further, in the case of an O-ring made of an elastic material, the sealing groove is easy to be elastically fastened. However, there is a problem that the cut portion is necessarily required to fasten a backup ring made of an inelastic material.

Korean Patent Publication No. 10-2016-0041211

DISCLOSURE OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a pressure vessel for industrial process with improved durability so as to stably maintain and maintain super high pressure gas used in an industrial process.

In order to solve the above problems, the present invention provides an industrial process pressure vessel including an integral liner made of a synthetic resin material having a hollow portion filled with a gas at a high pressure therein and having an injection portion protruding outward at one side thereof, A synthetic resin insert socket portion having a stepped through portion formed in an inner peripheral surface of the portion to be fused and fixed, the central portion of the insert socket having a stepped narrowed portion formed in a stepped manner toward an inner side of the integral liner; A nozzle boss part made of a metal material and coupled to surround the outside of the injection part; The nozzle boss portion may be provided with a stepped end portion of the stepped penetration portion and an outer circumferential surface portion overlapping with a predetermined width at an end portion of the fastening portion extending to one side of the head portion corresponding to the end surface of the nozzle boss portion, A metal adapter portion having a stepped insertion portion to be narrowed; And a sealing part which is fastened in multiple stages to a sealing space formed between the stepped inner peripheral part of the stepped penetrating part and the outer peripheral part of the stepped insertion part.

Here, the insert socket portion is formed of the same synthetic resin material as the integral liner, and is fixed integrally by ultrasonic welding or heat fusion to the mutually facing opposing surfaces. The insert socket portion is integrally fixed to the end surface of the injection portion, It is preferable that the extending restraint portion along the rim is struck in the radial direction.

In addition, the sealing space may be formed in a multi-tiered manner with different inner and outer diameters along a direction in which the stepped penetration portion and the stepwise insertion portion are narrowed, and the sealing portion is formed in a circumferential direction It is preferable that an integral backup ring and an O-ring of an elastic material sequentially disposed on the back side of the backup ring are included.

Preferably, the sealing space is formed such that the inner circumferential surface portions of the stepped penetration portion and the outer circumferential surface portions of the stepped insertion portion are overlapped with each other by a predetermined width and are closely contacted with each other, and the stepped surfaces facing each other at a plurality of steps are spaced apart from each other by a predetermined width.

It is preferable that an insert slope portion having a diameter gradually increasing toward the inner surface side of the extended restricting portion is formed on the outer circumferential surface of the insert socket portion.

Through the above-mentioned solution, Industrial process pressure vessels provide the following benefits.

First, even if the injection molded portion of the integrally molded liner is formed to have a constant thickness, if the insert socket portion is manufactured separately and then fused to the inner surface of the injection portion, a precise stepped inner surface structure for ultra- May be provided as a formed liner. Therefore, stable supporting strength and sealing force can be ensured even when a gas requiring high safety such as CNG or hydrogen gas is filled at an ultra-high pressure of 200 bar or more.

Secondly, each of the inner circumferential surface portions and the outer circumferential surface portions facing each other of the stepped penetration portion and the stepwise insertion portion is formed to be precisely multi-stepped so as to correspond to the inner circumference and the outer circumferential shape of the integrated backup ring. Accordingly, since the fastening interval for moving the backup ring in close contact is minimized, the wear and tightness of the fastening position are minimized, so that precise fastening is possible without a separate cutout, thereby further improving the sealing performance in an ultra high pressure environment.

1 is a perspective view of a pressure vessel for an industrial process according to an embodiment of the present invention;
Fig. 2 is an exploded perspective view showing part A of Fig. 1; Fig.
3 is an exploded sectional view showing part A of Fig.
4 is a cross-sectional view showing a state in which the portion A in Fig. 1 is engaged;

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

Fig. 1 is a perspective view showing a pressure vessel for industrial process according to an embodiment of the present invention, Fig. 2 is an exploded perspective view showing part A of Fig. 1, Fig. 3 is an exploded sectional view showing part A of Fig. 4 is a cross-sectional view showing a state in which the portion A in Fig. 1 is engaged.

1 to 4, the pressure vessel 100 for industrial process according to the present invention is formed of a synthetic resin material having a hollow portion filled with gas at high pressure therein and having an injection portion 11 protruding outward at one side And an integrated liner 10.

Here, the pressure vessel 100 for industrial process is filled with a gas flow used in an industrial process, and a connector for piping connection is provided at one side. At this time, the connector may be provided at one side of the pressure vessel 100 or at both sides thereof.

For example, when the connector is provided on one side of the pressure vessel 100, the connector may be provided as a bidirectional valve. Alternatively, when the connector is provided on both sides, a valve for gas filling may be provided at one side and a safety valve may be provided at the other side for discharging gas.

Particularly, in order to ensure a stable supporting strength even when a gas requiring high safety such as CNG or hydrogen gas is filled at an ultra-high pressure of 200 bar or more, the pressure vessel 100 is formed integrally with the cylinder and a pair of dome parts .

For this purpose, the integral liner 10 may be provided by rotational molding. In detail, the above rotational molding process is also referred to as lot molding, in which a hollow mold having a hollow interior is continuously rotated in the x-axis direction and the y-direction axis by a method of molding a hollow product by using a powdery raw material. When heat is applied to the mold, the hollow powdery material is melt-adhered to the inner wall to produce a hollow molded product.

The rotational molding process is such that the thickness of the molded article is uniformly formed on the inner wall of the mold and the residual stress is not substantially present in the molded article because the pressing process of the material is omitted in the molding process. Accordingly, breakage of the pressure vessel 100 for industrial process due to external force is prevented and durability is improved, safety is improved, and service life is remarkably prolonged.

In addition, although not shown in the drawing, the integral liner 10 may further include an internal pressure strengthening portion. In detail, the pressure-resistant reinforcing portion may be formed by heating and curing the synthetic resin along the outer peripheral surface of the integral liner 10 at a plurality of times so that the carbon fibers impregnated with the synthetic resin are crossed and overlapped. Accordingly, since the pressure resistance in the axial direction and the radial direction can be maximized from the inside of the pressure vessel 100 for industrial process, the storage and transportation efficiency of the product can be remarkably improved.

On the other hand, in the integrated liner 10, since the dome portion and the cylinder are integrally formed, the supporting strength against the gas pressure is improved, but the injection portion 11 side is simply formed with a uniform thickness, May be deteriorated. Accordingly, the present invention provides a structure in which the sealing force against ultrahigh pressure can be improved although the thickness of the injection part 11 of the integrally formed liner 10 integrally formed by lot molding is constant.

In detail, it is preferable that the integral liner 10 has a structure in which the connector can be fastened to the injection part 11 so that the gas can be selectively filled or discharged. The injection unit 11 may be provided with an insert socket unit 20, a nozzle boss unit 30, an adapter unit 40, and a sealing unit 50.

Here, the insert socket unit 20 is preferably fitted and fixed to the inner circumferential surface 11b of the injection unit 11. At this time, the central portion 20b of the insert socket 20 is preferably formed with a penetration portion having a stepped inner surface structure for ultra-high pressure sealing.

Specifically, the outer circumferential surface 20a of the insert socket portion 20 is formed to have a diameter corresponding to the inner circumferential surface 11b of the injection portion 11. The stepped penetration portion 21 is formed in the central portion 20b penetrating in the longitudinal direction so that the stepped penetration portion 21 is gradually narrowed toward the inner side of the integral liner 10.

The stepped through portion 21 has a first socket stepped portion 23a narrowed from the end of the first inner circumferential portion 22a formed in a predetermined length toward the center of the insert socket portion 20, . The second inner circumferential surface portion 22b extends from the inner end of the first socket stepped surface portion 23a to a predetermined length. The second inner circumferential surface portion 22b extends from the end of the second inner circumferential surface portion 22b, The surface portion 23b may be formed substantially orthogonal.

Accordingly, the stepped through portion 21 may have a stepped shape in which the second inner circumferential surface portion 22b is formed to have a diameter smaller than that of the first inner circumferential surface portion 22a. Accordingly, when the insert socket portion 20 is inserted into the injection portion 11, the stepped penetration portion 21 can be narrowed so as to be stepped in the inner direction of the integral liner 10. In this case, although the socket stepped surface portion 23 is shown as being formed in two places in the drawing, the socket stepped surface portion 23 may be formed in two or more places as the case may be.

The insert socket 20 may be made of the same synthetic resin as the integrated liner 10. For example, the integral liner 10 and the insert socket 20 may be formed of polyamide (PA) resin. An outer circumferential surface 20a of the insert socket portion 20 formed of the same resin material as the integral liner 10 is inserted into the inner circumferential surface 11b of the injection portion 11 so as to be in close contact therewith, Ultrasonic fusion bonding or heat fusion bonding and can be integrally fixed.

In detail, the ultrasonic welding is a process in which electric energy is converted into mechanical vibration energy through a vibrator at a power input of 60 Hz, and fusing is performed when instantaneous friction heat is generated on the joint surface when a pressing force is applied to the work through the horn. At this time, since the bonding surfaces are integrally formed by strong molecular bonding in which the bonding surfaces are fusion-bonded, deformation and alteration of the product surface can be minimized. In addition, it is instantaneously adhered, which saves processing time and solves the difficulties in mold production.

That is, although the integral liner 10 is processed by lot molding to produce the inner wall surface and the thickness of the injection part 11 uniformly, the insert socket part 20 is manufactured separately and then subjected to ultrasonic welding or heat fusion It is possible to provide a structure in which the stepped through portion 21 is formed integrally with the inner peripheral surface of the injection portion 11 so as to be narrowed stepwise in the inward direction so that the productivity can be remarkably improved.

Further, even if the injection part 11 is subjected to lot molding with a uniform thickness with other parts of the integral liner 10, the thickness of the injection part 11 is substantially reinforced as the insert socket part 20 is fused and fixed . Thus, the support strength and durability against the pressure of the gas can be remarkably improved. In addition, even if a screw tapping process for screwing the nozzle boss portion 30 is performed, the strength is maintained, so that breakage in the machining process can be prevented. In addition, as the injection part 11 and the insert socket part 20 are fused and integrated, gas leakage between mutually opposing surfaces is substantially prevented, so that safety can be remarkably improved.

At this time, the extended restricting portion 24 is radially protruded along the outer end edge of the insert socket portion 20 so that the insertion socket portion 20 is in tight contact with the end face 11c of the injection portion 11, desirable. That is, when the insert socket portion 20 is inserted into the injection portion 11, when the lower surface of the extension restricting portion 24 is brought into close contact with the end surface 11c of the injection portion 11, (20) can be restrained in the correct position and aligned and fixed.

Accordingly, it is possible to prevent the insert socket portion 20 from falling into the hollow portion of the integral liner 10 or being fastened at an incorrect position.

The adapter portion 40 is fastened to the insert socket portion 20 at the correct position and then engaged with the insert portion 20 only by the extension restricting portion 24 being in close contact with the end face 11c of the injection portion 11, , The valve, the connector, and the like are correctly fastened to prevent leakage of the gas.

At this time, an insert slope 25 may be formed on the outer circumferential surface 20a of the insert socket 20 so that the diameter gradually increases toward the lower side of the extended restricting portion 24. [ Since the insert slope part 25 can be pressed against the inner circumferential surface of the injection part 11 so that the insert socket part 20 is inserted into the injection part 11, It is also possible to prevent it from being arbitrarily separated.

Of course, depending on the case, a fitting protrusion protruding in multiple steps along the circumferential direction may be formed on the outer circumferential surface 20a of the insert socket portion 20. [ That is, since the insert socket portion 20 is firmly inserted into the injection portion 11 through the projecting structure in the radial direction like the insertion slant portion 25 to the insert projection portion, workability can be remarkably improved .

Meanwhile, the nozzle boss unit 30 may be provided to surround the outside of the injection unit 11. The nozzle boss unit 30 may be provided to surround the outer circumferential surface 11a of the injection unit 11 and the outer side 10a of the connection part 11 between the injection unit 11 and the integral liner 10. [ have. Accordingly, the injection unit 11 can be supported so as not to be inflated or damaged by the pressure of the gas while mediating the connection between the injection unit 11 and the adapter unit 40.

At this time, it is preferable that the nozzle boss unit 30 is formed with a thread along the inner circumferential surface 31 passing through the center part. One side 31a of the inner circumferential surface of the nozzle boss unit 30 and the outer circumferential surface 11a of the injection unit 11 may be screwed together and fixed.

In addition, a fastening surface portion 32 may be formed on the outer circumferential surface of the nozzle boss portion 30 so that operation for screw fastening is facilitated. At this time, the fastening surface portion 32 may have a hexagonal cross-section as shown in the drawing, or may be formed as a D-cut portion according to circumstances. That is, the fastening surface portion 32 may be formed in various shapes as long as the fastening surface can be easily rotated so that the nozzle boss portion 30 is screwed.

Here, the nozzle boss unit 30 may be formed of a metal material. Even if the gas filled in the inner space of the integral liner 10 is discharged to the outside through the injecting part 11 having a small diameter, the nozzle boss part 30 is formed in the inner part of the injection part 11 The outer side can be firmly covered and the breakage due to the high pressure can be prevented.

The adapter 40 may include a through hole 40a communicating with the injection unit 11 and may be screwed to the nozzle boss 30.

It is preferable that a head portion 41 having an inner surface 41a corresponding to the end surface 30a of the nozzle boss portion 30 is provided at one end of the adapter portion 40. [ The fastening portion 42 is extended from the inner surface 41a of the head portion 41 in one direction and the outer peripheral surface 42a of the fastening portion 42 is provided on the other side of the inner peripheral surface of the nozzle boss portion 30 31b can be formed.

A coupling portion 47 can be formed on the inner circumferential surface of the through hole 40a on the side of the head portion 41 so that a valve or a connector can be selectively engaged. A fastening cut portion 45 for fastening can be formed.

At this time, the fastening cut portion 45 may be formed as a D-cut portion as shown in the drawing, or may have a hexagonal shape according to the case. That is, the fastening cut portion 45 may be formed in various shapes as long as the fastening cut portion 45 has a shape that can be rotated easily so as to be screwed with the nozzle boss portion 30.

That is, the injector 11 of the integral liner 10 is fastened to one side of the nozzle boss unit 30, and the adapter unit 40 is connected to the other side of the nozzle boss unit 30, so that the gas can be moved.

A stepped insertion portion 43 is formed at the end of the fastening portion 42 so as to be stepped toward the end so as to form an outer circumferential surface portion 44 which is in close contact with the stepped inner circumferential surface portion 22 of the stepped penetrating portion 21. [ Is formed.

The nozzle boss portion 30 is fastened to the outer side of the injection portion 11 while the insert socket portion 20 is fused and fixed to the inner peripheral surface 11b of the injection portion 11, 40 are continuously fastened, the stepped insertion portion 43 is inserted into the stepped insertion portion 21.

The stepped insertion portion 43 extends from an end portion of the first outer circumferential surface portion 44a, which has a diameter corresponding to the first inner circumferential surface portion 22a of the stepped through hole 21 and extends to a predetermined length, A first adapter stepped surface portion 45a is formed. A second outer peripheral surface portion 44b is formed at a predetermined length from the inner end of the first adapter step surface portion 45a and a second adapter stepped portion 44b narrowed from the end portion of the second outer peripheral surface portion 44b toward the center, The surface portion 45b can be formed.

That is, since the second outer circumferential surface portion 44 is formed to have a diameter smaller than that of the first outer circumferential surface portion 44, the stepped penetrating portion 21 can be narrowed in a stepwise manner toward the inner direction of the integral liner 10 have. In this case, although the adapter stepped surface portion 45 is shown as being formed at two locations, the adapter stepped surface portions 45 may be formed at two or more locations.

A predetermined sealing space s is formed between the stepped inner circumferential surface portion 22 of the stepped penetration portion 21 and the stepped outer circumferential surface portion 44 of the stepped insertion portion 43, s in a multi-stage manner.

At this time, the extended length of the first inner circumferential surface portion 22a may be longer than the extended length of the first outer circumferential surface portion 44a. When the end face 42b of the fastening part 42 is fastened to the end face 11c of the injection part 11 to which the insert socket part 20 is welded and fixed, 23) and each of the adapter stepped surface portions 45 may be spaced apart from each other by a predetermined distance.

Furthermore, the lengths of the second inner circumferential surface portion 22b and the second outer circumferential surface portion 42b may be different from each other. That is, the lengths of the inner circumferential surface portions 22 and the outer circumferential surface portions 44 are partially overlapped with each other when the stepped insertion portion 43 is inserted into the stepped penetration portion 21, The surface portion 23 and the adapter step portion 45 of the adapter.

It is preferable that the sealing space s be formed in a multi-stage shape with different inner and outer diameters along the direction in which the stepped penetration portion 21 and the stepped insertion portion 43 are stepped narrow. The sealing portion 50 is preferably formed by stacking a backup ring 51 made of a non-elastic material and an O-ring 52 made of an elastic material sequentially in the sealing space s.

That is, even if the sealing groove is not separately formed, the adapter portion 40 can be inserted into the outer peripheral surface portion 44 of the stepped insertion portion 43 while sequentially fitting the backup ring 51 and the O- The sealing portion 50 can be interposed in the sealing space s formed naturally by fastening the nozzle boss portion 30 to the nozzle boss portion 30.

At this time, each inner circumferential surface portion 22 of the stepped penetration portion 21 substantially corresponds to the outer circumferential shape of the backup ring 51, and each outer circumferential surface portion 44 of the stepwise insertion portion 43 is connected to the backup ring 51, It is preferable to process the inner circumferential shape of the outer circumferential surface 51 substantially correspondingly.

In detail, the backup ring 51 is disposed on the inner side of the integral liner 10 in each of the sealing spaces s and is integrally formed in a columnar shape. The outer peripheral diameters d3 and d7 of the integral backup ring 51 correspond to the diameters d1 and d2 of the stepped inner circumferential surface portions 22 of the stepped through portion 21 and the inner diameter d4 and d8 Is preferably associated with the diameter (d5, d6) of the stepped outer circumferential surface portion 44 of the stepped insertion portion (43). Accordingly, since the inner circumference or the outer circumference of the integral backup ring 51 can be stably and precisely fastened in a detached state, the sealing force at an ultra-high pressure can be remarkably improved.

Although the sealing portions 50 are provided along the longitudinal direction of the injection portion 11 so that the sealing force against the extra-high pressure is improved, the stepped insertion portions 21 and the stepped insertion portions 43 are stepped The fastening interval of the integral backup ring 51 fastened to the respective sealing spaces s can be minimized. Accordingly, even if the separate backup ring 51 is not provided with a separate cut portion, it can be brought into close contact with the inner circumferential surface portions 22 of the stepped penetrating portion 21 and the outer circumferential surface portions 44 of the stepped insertion portion 43, Position. As a result, the integrated backup ring 51 can buffer the pressure of the gas that can be transferred to the O-ring 52, so that the sealing force against the high pressure can be remarkably improved.

Furthermore, each sealing space s is stepped between mutually opposing stepped sections of the stepped penetration portion 21 and the stepped insertion portion 43. Accordingly, the gas pressure applied to the injection part 11 side is prevented from being directly transmitted to the sealing part 50, so that the sealing force can be further improved. Here, the step section is preferably understood to be the area of the stepped inner circumferential surface portion 22 and the outer circumferential surface portion 44 about the socket step surface portion 23 and the adapter step surface portion 45, respectively.

That is, as the integral backup ring 51 is linearly disposed in the sealing space s adjacent to the inner space of the integral liner 10, the pressure of the gas is directly applied to the O-ring 52 made of elastic material Can be prevented from being transmitted. Further, since the integral backup ring 51 is formed in a ring shape integrally formed along the circumferential direction, it is possible to prevent the problem that the gas leaks through the gap of the cut portion formed in the conventional backup ring.

At this time, the integral backup ring 51 may be made of engineering plastics. Specifically, the engineering plastic material may be selected from any one of polyether ether ketone (PEEK), polytetrafluoroethylene (PTFE), polyimide, and polyamide-imide. . Here, the engineering plastic material described above is a polymer material and has characteristics of excellent strength, impact resistance, abrasion resistance, heat resistance, chemical resistance and electrical insulation.

Accordingly, even if gas filled in the pressure vessel 100 at a high pressure leaks between the inner circumferential surface portion 22 of the stepped penetration portion 21 and the outer circumferential surface portion 44 of the stepped insertion portion 43, It is possible to prevent deformation and breakage of the O-rings 52 arranged sequentially as well as deformation of the O-rings 51 themselves. Accordingly, even if the gas is filled in the pressure vessel 100 at a high pressure of a certain level or higher, safety is stably sealed in the sealing part 50, so that safety can be remarkably improved.

In addition, since the sealing space s is divided into multiple stages, the integral backup ring 51 is integrally formed in a ring shape in the circumferential direction. Even if the integral backup ring 51 is made inelastic, the engagement interval for insertion can be minimized. Accordingly, since the inner circumferential surface or the outer circumferential surface of each integral backup ring 51 is prevented from being worn or unstable, the assemblability and post-assembly stability can be remarkably improved.

In addition, since the sealing space s is formed in a stepwise manner, even if the gas filled in the hollow portion leaks, the sealing force can be further improved since it is restrained by the stepped surface portions 23 and 45.

Accordingly, although the pressure vessel for industrial process 100 according to the present invention is formed by the lot-molding to support the pressure of the gas, the thickness of the injection part 11 of the integrally formed liner is uniform, the insert socket part 20 Is formed separately and then fused to the inner surface of the injection part 11, a precise stepped inner surface structure for ultra-high pressure sealing can be provided as a substantially integrally formed liner. Accordingly, stable supporting strength and sealing force can be ensured even when a gas requiring high safety such as CNG or hydrogen gas is filled at an ultra-high pressure of 200 bar or more.

The inner circumferential surface portion 22 and the outer circumferential surface portion 44 of the stepped penetration portion 21 and the stepped insertion portion 43 are opposed to each other so as to correspond to the inner circumference and the outer circumferential shape of the integrated backup ring 51, So as to be stepped in multiple stages. As a result, the tightening interval at which the integral backup ring 51 is moved in close contact with each other is minimized, thereby minimizing the wear and defective position. Therefore, it is possible to precisely tighten without any separate cut portion, thereby further improving sealing performance in an ultra-high pressure environment .

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And these modifications fall within the scope of the present invention.

10: integral liner 11: injection part
20: insert socket portion 21: stepped through portion
24: extension restricting portion 30: nozzle boss portion
40: Adapter part 41: Head part
42: fastening part 43: stepped insertion part
50: sealing part 51: integral backup ring
52: O-rings 100: Industrial process pressure vessel

Claims (5)

1. An industrial process pressure vessel comprising an integral liner made of a synthetic resin material having a hollow portion filled with gas at a high pressure therein and having an injection portion protruding outwardly on one side,
A synthetic resin insert socket portion having a stepped through portion formed at an intermediate portion of the insert liner to be inserted into the inner circumferential surface of the injection portion and narrowed in a stepwise manner toward an inner side of the integral liner;
A nozzle boss part made of a metal material and coupled to surround the outside of the injection part;
The nozzle boss portion may be provided with a stepped end portion of the stepped penetration portion and an outer circumferential surface portion overlapping with a predetermined width at an end portion of the fastening portion extending to one side of the head portion corresponding to the end surface of the nozzle boss portion, A metal adapter portion having a stepped insertion portion to be narrowed; And
And a sealing part which is fastened to the sealing space formed between the stepped inner circumferential surface of the stepped penetration part and the outer circumferential surface of the stepped insertion part in multiple stages. The method according to claim 1,
Wherein the insert socket portion is formed of the same synthetic resin material as the integral liner and is fixed integrally by ultrasonic welding or heat welding to the mutually close opposing surfaces,
And an elongate restricting portion is protruded in a radial direction along an outer end edge so as to be in contact with the end face of the injection portion so as to be constrained in a fitting position. The method according to claim 1,
Wherein the sealing space is formed in a multi-tiered manner with different inner and outer diameters along a direction in which the stepped penetration portion and the stepwise insertion portion are narrowed stepwise,
Wherein the sealing portion includes a circumferentially integral backup ring disposed on an inner side of the integral liner and an elastic O-ring sequentially disposed on the back side of the backup ring. The method of claim 3,
Wherein the sealing space is formed in such a manner that the inner circumferential surface portions of the stepped penetration portion and the outer circumferential surfaces of the stepped insertion portion overlap each other with a predetermined width and are spaced apart from each other by a predetermined width, Pressure vessel. The method according to claim 1,
Wherein an insert slope portion is formed on an outer circumferential surface of the insert socket portion so that the diameter gradually increases toward the inner surface side of the extended restricting portion.

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