KR20170130649A - Pressure vessel - Google Patents

Abstract

A pressure vessel according to the present invention comprises: a nozzle boss having a neck portion formed in a hollow shape, a flange portion extending outward from the neck portion, and a protrusion extending in a hollow shape from one end of the neck portion; a liner coupled to the flange portion of the nozzle boss and providing a fluid filling space therein; and a sealing portion, a pressing portion, an elastic member, and a pressure building portion which are sequentially inserted along an outer circumferential surface of the protrusion. The sealing portion prevents a fluid from flowing out through a boundary between the flange portion and the liner by preventing the fluid from coming in direct contact with the boundary. The pressing portion presses the sealing portion upward in an axial direction. The pressure building portion is engaged with the protrusion to provide and maintain a pressing force to the pressing portion. The elastic member is provided between the pressing portion and the pressing building portion. According to the pressure vessel of the present invention, since the elastic member is provided between the pressing portion and the pressing building portion, it is possible to delay a decrease in a fixing force for maintaining a coupling force between the nozzle boss and the liner to a maximum extent as well as to maintain an airtight structure by the sealing portion with constant elasticity.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pressure vessel, and more particularly, to a pressure vessel having a structure for firmly holding a clamping force / coupling force between a nozzle boss and a liner.

BACKGROUND ART A pressure vessel is a vessel used for storing various fluids such as oxygen, natural gas, nitrogen, hydrogen, and the like. Conventionally, a nozzle boss and a liner are made of a metallic material, and carbon fiber or glass fiber is applied to the outside of the nozzle boss and liner Or laminated. However, the conventional pressure vessel made of a metallic liner has a problem that the weight of the pressure vessel is heavy due to the nature of the metal, is extremely weak in corrosion, and the manufacturing cost is high.

In order to solve this problem, plastic liner made of synthetic resin was manufactured. Due to the nature of plastic, it was possible to lighten weight and improve corrosion resistance compared with metal material.

However, even in the case of manufacturing a pressure vessel using a plastic liner, the nozzle boss had to be made of a metal material other than the liner, or a nonmetallic material, thereby deteriorating the bonding strength between the metallic or nonmetallic nozzle boss and the plastic liner A new problem has arisen.

That is, in the case of using a conventional metallic liner, there was no great difficulty in firmly bonding the liner and the nozzle boss. However, in the case of using the plastic liner, due to the manufacturing process and the characteristics of the material, There is a problem in implementing the state.

In order to solve the above problems, a plastic fastener for binding a plastic liner and a metallic nozzle boss has been used. However, this poses another problem that it is difficult to install a fastener in a plastic liner.

Alternatively, the nozzle boss may be formed into a groove by inserting the nozzle boss into a plastic liner. However, it is also somewhat difficult to realize a perfect bonding state.

The present invention provides a pressure vessel capable of preventing the outflow of abnormal fluid by maintaining the fixing force for maintaining the coupling structure between the liner and the nozzle boss at the maximum in repetitive filling and discharging of the fluid.

A pressure vessel according to the present invention includes a nozzle boss having a neck portion formed in a hollow shape, a flange portion extending outwardly from the neck portion, and a protrusion extending in a hollow form from one end of the neck portion; A liner that engages a flange portion of the nozzle boss and provides a fluid filling space therein; And a sealing portion, a pressing portion, an elastic member, and a pressure increasing portion that are sequentially extrapolated along the outer circumferential surface of the projection. Wherein the sealing portion prevents direct contact of the fluid with a boundary between the flange portion and the liner to prevent fluid outflow through the boundary, the pressing portion urges the sealing portion upwardly in the axial direction, The enhancing portion is engaged with the protruding portion to provide the pressing portion with a pressing force, and the elastic member is provided between the pressing portion and the pressing enhancing portion.

The elastic member may be formed in a ring shape and extrapolated to the protrusion.

Further, the elastic member may be formed in a ring shape inclined in either the downward direction or the upward direction in the outward direction from the central axis.

The plurality of elastic members may be provided and may be extrapolated to the protrusions in a stacked state.

The elastic member may be formed in a wave shape along the circumferential direction.

The sealing portion may be formed of a silicon material.

Further, the sealing portion may be formed with an upwardly bent bent portion so as to be in close contact with a boundary region between the flange portion and the liner.

The pressing portion may be formed with at least one pressing hole so that the space formed inside the bending portion of the sealing portion and the inner space of the liner communicate with each other.

Further, the pressure enhancing portion may be fastened to the protruding portion by a screw fastening method.

According to the pressure vessel of the present invention, by providing the elastic member between the pressure increasing portion and the pressing portion, it is possible to delay the decrease of the fixing force for maintaining the bonding force between the components, that is, the bonding force between the nozzle boss and the liner, The airtight structure of the sealing portion can be maintained with a certain elasticity.

In addition, it is possible to prevent contact between the boundary between the nozzle boss and the liner and the fluid, and prevent the non-ideal outflow path of the fluid from occurring.

Further, even when the internal pressure is low, the adhesion between the nozzle boss and the liner can be enhanced.

1 is a schematic partial cutaway perspective view showing a pressure vessel according to an embodiment of the present invention.
2 is a schematic partial sectional view showing a pressure vessel according to an embodiment of the present invention.
3 is an enlarged view schematically showing a portion A in Fig.
Fig. 4 is a schematic enlarged view showing an enlarged part of Fig. 3. Fig.
5 is a schematic exploded perspective view (composite is omitted) showing a pressure vessel according to an embodiment of the present invention.
6 is a perspective view schematically showing an elastic member according to an embodiment.
7 is a longitudinal sectional view showing a state of the elastic member according to FIG.
Fig. 8 is a longitudinal sectional view showing a state in which a plurality of elastic members of Fig. 6 are used. Fig.
9 is a perspective view schematically showing an elastic member according to another embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the absence of special definitions or references, the terms used in this description are based on the conditions indicated in the drawings. The same reference numerals denote the same members throughout the embodiments. For the sake of convenience, the thicknesses and dimensions of the structures shown in the drawings may be exaggerated, and they do not mean that the dimensions and the proportions of the structures should be actually set.

1 to 5, a pressure vessel according to an embodiment of the present invention will be described. FIG. 1 is a schematic partial cutaway perspective view showing a pressure vessel according to an embodiment of the present invention, FIG. 2 is a schematic partial cross-sectional view showing a pressure vessel according to an embodiment of the present invention, FIG. 3 is a cross- Fig. Fig. 4 is an enlarged schematic enlarged view of part of Fig. 3, and Fig. 5 is a schematic exploded perspective view (composite is omitted) showing a pressure vessel according to an embodiment of the present invention.

Hereinafter, terms for direction are defined as follows for convenience of explanation. The outer or inner direction in the radial direction may mean a direction (X) from the center C of the neck portion 110 toward the outer circumferential surface or vice versa as viewed in FIG. 2, and the upper or lower axial direction May mean a direction from the lower surface of the neck portion 110 toward the upper surface (Y) or vice versa.

The pressure vessel 10 according to an embodiment of the present invention is a vessel used for storing various kinds of fluids such as oxygen, natural gas, nitrogen, hydrogen, etc., and is provided so as to be capable of repeatedly filling and discharging the fluid . 1, the pressure vessel 10 includes a nozzle boss 100 serving as a passage for filling and discharging fluid, a liner 200 coupled to the nozzle boss 100 to provide a fluid filling space therein, And a separation preventing part 300 for preventing separation between the nozzle boss 100 and the liner 200.

In order to improve the pressure resistance after the nozzle boss 100 and the liner 200 are coupled to each other, the outer surface of the nozzle boss 100 and the liner 200 are pressed by the composite material 400 to a predetermined thickness It may be rolled up. This will be described later.

The nozzle boss 100 may have a hollow portion 110 having a hollow interior and a flange portion 120 extending radially outwardly from a substantially lower end of the neck portion 110 have.

1 to 3, a thread is formed on the upper inner circumferential surface of the neck portion 110. When the fluid is filled in the pressure vessel 10 by using a screw thread formed on the inner circumferential surface of the neck portion 110 or when the fluid is discharged from the pressure vessel 10 to the outside, .

1 to 4, the flange portion 120 extends radially outward from a substantially lower end of the neck portion 110. [ The flange portion 120 may be integrally formed with the neck portion 110 as a constituent portion of the nozzle boss 100 described above, or may be formed by mechanical coupling. The flange portion 120 is combined with the liner 200 to be described later to form a hermetic structure.

The nozzle boss 100 may be fabricated by processing steel, aluminum, plastic, or the like. The nozzle boss 110 may be formed by molding the upper mold 22 and the lower mold 22, The synthetic resin P is introduced into the injection mold 20 after being inserted into the internal space S3 of the injection mold 20 constituted by the mold 24 to form the liner 200 to be coupled with the nozzle boss 100 can do. That is, the liner 200 can be manufactured by the nozzle boss 100 and insert injection, and can be made of plastic.

As shown in FIGS. 1 and 2, the liner 200 is a kind of plastic cylinder having a predetermined internal space, and both ends are hemispherical, and the central portion may have a hollow pipe shape.

However, instead of integrally manufacturing the liner 200, the hemispherical portion and the central cylindrical portion may be separately manufactured and joined together by a process such as heat fusion. In this case, since the sealing portion 500, the pressing portion 600, and the pressure enhancing portion 700 to be described later are located inside the liner 200, the assembly can be facilitated.

2 to 4, the pressure vessel 10 according to the present invention is provided with a detachment preventing portion (not shown) surrounded by the liner 200 to prevent separation between the nozzle boss 100 and the liner 200 300). The detachment preventing portion 300 may be disposed in a space provided by the boundary between the nozzle boss 100 and the liner 200.

Specifically, the flange portion 120 of the nozzle boss 100 includes a fixing portion 130, which is formed by being embedded in the radially inward direction so that the liner 200 is disposed and fixes the liner 200 to the flange portion 120 . The fixing portion 130 is a kind of coupling space for the liner 200 to be coupled to the flange portion 120. [ The fixing portion 130 can be formed in various structures other than the coupling structure and the coupling shape according to the present embodiment.

That is, the fixing portion 130 may be a coupling structure provided near the boundary between the nozzle boss 100 and the liner 200, preferably a space for coupling. A synthetic resin or the like is injected onto the periphery of the fixing portion 130 and the fixing portion 130, that is, the main surface of the flange portion 120 to form the liner 200.

Here, the fixing portion 130 may be continuously formed along the circumferential direction, and the engagement space in which the liner 200 is coupled toward the radially inward direction may be increased. In other words, the fixing portion 130 may have a shape in which the width in the axial direction increases toward the radially inward direction, and is classified according to the width in the axial direction or the relative size to the engaging space in which the liner 200 is engaged And a second fixing part 134 formed to be larger than the first fixing part 132 and the first fixing part 132.

The second fixing portion 134 may be formed radially inward of the first fixing portion 132 and the axial cross section of the fixing portion 130 may be formed so as to satisfy the binding force between the liner 200 and the flange portion 120 It may be shaped like a cross to increase it.

The liner 200 may have a fixed corresponding portion 210 corresponding to the shape of the fixing portion 130 by insert injection. The liner 200 and the nozzle boss 100 can be stably coupled by the fixing part 130 and the fixing part 210. [

Here, in a general pressure vessel, when the fluid is pressurized and charged, the internal temperature rises to about 80, and when the fluid is rapidly discharged, it is lowered to about -40. Therefore, when repeating charging and discharging, The liner formed of the material may be separated from the boundary due to the difference in thermal expansion coefficient or the liner may be folded. When the inside of the pressure vessel is at a high pressure, the boundary between the liner and the nozzle boss can be closely adhered to maintain the airtightness. However, if the pressure is low, there is a possibility that unexpected fluid outflow may occur.

However, the pressure vessel 10 according to the present invention can minimize the possibility of separation between the nozzle boss 100 and the liner 200 due to the fixing part 130 and the fixing part 210 described above. That is, when the inside of the pressure vessel 10 is pressurized and expanded or discharged and contracted, the shape of the fixing portion 130 is formed radially inward to increase the engagement space in which the liner 200 is coupled, The separation of the liner 200 from the nozzle boss 100 can be minimized.

The cross section in the axial direction of the fixing portion 130 is not limited to the above-mentioned cross shape and may be circular, elliptical or various shapes as long as the liner 200 can minimize the separation from the nozzle boss 100. [ Or may be formed in a polygonal shape.

The neck portion 110 of the nozzle boss 100 may have a protruding portion 140 projecting downward in the axial direction and a lower portion of the protruding portion 140 may be provided with a screw A thread may be formed for fastening.

Specifically, the sealing portion 300, the pressing portion 500, the elastic member 410, and the pressure enhancing portion 600 can be inserted and fixed to the protruding portion 140 in a downward direction in the axial direction. The sealing part 300, the pressing part 500 and the elastic members 410 can be stably inserted and fixed to the protruding part 140 by screwing the pressure increasing part 600 and the protruding part 140. [

The seal part 500 is a component for preventing a non-ideal outflow of fluid through the boundary between the nozzle boss 100 and the liner 200, Thereby preventing direct contact of the user.

4 and 5, the sealing portion 300 may be formed as a ring-shaped plate that circumferentially extends in a circumferential direction, and a bent portion (not shown) 310 may be formed. The bent portion 310 may be formed along at least a portion of the sealing portion 300 along the central portion of the ring-shaped plate shape or in the circumferential direction. The bending part 310 directly contacts the boundary between the liner 200 and the flange part 120 to prevent the fluid from directly contacting the liner 200 and the flange part 120, And presses the boundary portion of the liner 200 to prevent the liner 200 from separating from the flange portion 120 to increase the coupling force between the liner 200 and the flange portion 120.

The sealing portion 500 is formed of a silicone material so that even when the pressure vessel 10 is expanded and then contracted, the sealing portion 500 can be securely fixed to the flange portion 120 of the nozzle boss 100 by the internal pressure of the pressure vessel 10 The separation between the liner 200 and the nozzle boss 100 can be prevented in advance. That is, even if the sealing portion 300 blocks the flow of the fluid through the boundary between the liner 200 and the nozzle boss 100, that is, the path of the fluid outflow, the internal pressure of the pressure vessel 10 is low, Thereby continuing to pressurize the sealing portion 300 to prevent leakage of non-ideal fluid.

On the other hand, the fixing force of the sealing part 300 to the protrusion 140 can be realized by the pressing part 500 that presses the sealing part 300 upward in the axial direction. The pressing portion 500 may be formed in a circular ring shape and presses the sealing portion 300 from the lower end of the sealing portion 300 so that the sealing portion 300 receives and transmits the upward pressing force.

The continuous pressing force by the internal pressure to the sealing part 300, that is, the transmission of the fluid pressure to the sealing part 300 is transmitted to the at least one pressing hole 510 formed in the pressing part 500 despite the pressing part 500 . ≪ / RTI > The pressurizing hole 510 may be formed so that the inner space formed by the liner 200 and the space formed by the bent portion 310 described above are communicated with each other. The pressure in the pressure vessel 10 can be transmitted to the bending part 310 through the pressurizing hole 510. The width of the pressing portion 500 in the radial direction is preferably equal to or larger than the width of the sealing portion 300 in the radial direction.

The bottom surface of the sealing portion 300 may include a protrusion 320 protruding toward the pressing portion 500 to improve the adhesion with the pressing portion 500. The protrusion 520 may protrude in the circumferential direction And may be formed continuously in at least one row. Here, the protrusion 320 can be elastically deformed by the pressing force of the pressing portion 500 and can be compressed. The adhesion between the sealing part 300 and the pressing part 500 can be further improved due to the protrusion part 320. [

An elastic member 410 is provided at the lower end of the pressing portion 500. The elastic member 410 according to the present embodiment is formed in a ring shape and has elasticity against axial force. The pressing member 600 is provided at the lower end of the elastic member 410. The pressurization enhancer 600 is engaged with the protrusion 140 in a screw-tight manner.

The pressing force is transmitted to the fixing part 500 and the sealing part 300 through the elastic member 410 when the pressure increasing part 600 is upwardly pressed by the screw fastening method. At this time, the resilient force of the resilient member 410 is increased by changing the shape of the resilient member 600 as the pressurizing unit 600 is pressed, and even after the pressurizing unit 600 is fixed, .

Assuming that there is no elastic member 410, the pressure enhancer 600 pressurizes the pressurizing unit 500 with a certain force in the initial stage of the manufacturing process. However, as the use time of the pressure vessel 10 continues, The coupling force between the protrusion part 600 and the protrusion part 140 can be loosened. In this case, since the overall pressing force is reduced, the pressing force by which the pressing portion 500 presses the sealing portion 300 can also be reduced, which may cause a problem in the overall airtight structure.

However, by providing the elastic member 410 according to the present embodiment, if the distance between the pressure directing portion 600 and the pressing portion 500 is not more than a predetermined distance, the elastic force of the elastic member 410 The pressing force for pressing the sealing part 300 can be maintained by pushing the part 500 upward. That is, the elastic member 410 functions to maintain a maximum pressing force capable of maintaining the airtight structure of the sealing part 300.

The pressure increasing part 600 and the protruding part 140 according to the present embodiment are implemented in a screw tightening structure. However, there is no limitation on the method of combining the pressure increasing part 600 and the protruding part 140, This is possible.

The pressure vessel 10 according to the present invention may further include a composite material 400 for enhancing pressure resistance by surrounding the liner 200. The composite material 400 may be made of carbon fiber, Reinforced fibers such as fibers may be impregnated with a resin such as an epoxy resin, and the resin may be filament wound or laminated to form a predetermined thickness on the outer side of the liner 200. [ At this time, the composite material 400 may be wound or laminated from the outer surface of the neck portion 110 of the nozzle boss 100.

6 to 9, an elastic member according to an embodiment of the present invention will be described. FIG. 6 is a perspective view schematically showing an elastic member according to an embodiment, and FIG. 7 is a longitudinal sectional view showing a state of the elastic member according to FIG. FIG. 8 is a longitudinal sectional view showing a state where a plurality of elastic members of FIG. 6 are used, and FIG. 9 is a perspective view schematically showing an elastic member according to another embodiment.

As shown in Figs. 6 and 7, the elastic member 410 according to the present embodiment may be provided as a ring-shaped or dish-shaped leaf spring. The elastic member 410 may be formed of a ring spring steel or the like which is formed to be inclined downward toward the outside. The elastic member 410 according to the present embodiment deforms in a shape that is flattened by a force in the vertical direction and the elastic force is increased in accordance with the deformation of the elastic member 410. [ Thereafter, the elastic member 410 provides an elastic force to the outside in the direction of restoring the circular shape.

Meanwhile, the elastic member 410 according to the present embodiment can be used in a manner that a plurality of elastic members 410 are provided in a plurality of vertical directions as shown in FIG. That is, a plurality of elastic members 410 may be used together by providing a pair of elastic members 410 and by mutually abutting the bottom surfaces of the elastic members 410 with reference to FIG.

For example, as shown in FIG. 8A, the elastic members 410 (a) may be used in a state in which the longer radius sides thereof are arranged to be in contact with each other. On the contrary, Members 410 (b) may be used. 8, the elastic modulus of the elastic member 410 is reduced, but the length of the cover capable of being covered by the elastic member 410, i.e., the distance capable of providing a constant pressing force is increased even though the pressing enhancer is loosened The effect can be obtained.

On the other hand, as shown in Fig. 9, a ring-shaped leaf spring 410a formed in a wave shape in the circumferential direction can also be used. In the case of such a wave leaf spring 410a, when the pressure increasing portion is pressed, the shape is deformed into a flat ring shape, thereby increasing the elastic force. The leaf spring 410a according to this embodiment is provided between the pressurization enhancing portion and the pressurizing portion in the same manner as the elastic member shown in FIG. 6 described above, and constantly maintains the elasticity of the sealing portion.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. have.

10: Pressure vessel
100: nozzle boss
110: neck portion
120: flange portion
130:
200: Liner
210:
220: Fixed counterpart
300: sealing part
400: composite
410: elastic member
500:
600:

Claims (9)

A nozzle boss having a neck portion formed in a hollow shape, a flange portion extending outwardly from the neck portion, and a protrusion extending in a hollow form from one end of the neck portion;
A liner that engages a flange portion of the nozzle boss and provides a fluid filling space therein; And
A sealing portion, a pressing portion, an elastic member, and a pressure enhancing portion that are sequentially extrapolated along the outer peripheral surface of the projection,
Wherein the sealing portion blocks direct contact of the fluid with respect to a boundary between the flange portion and the liner to prevent leakage of the fluid through the boundary,
The pressing portion presses the sealing portion upward in the axial direction,
Wherein the pressure enhancing portion is engaged with the protruding portion to apply and maintain the pressing force to the pressing portion,
Wherein the elastic member is provided between the pressing portion and the pressure improving portion. The method according to claim 1,
Wherein the elastic member is formed in a ring shape and is extrapolated to the projection. 3. The method of claim 2,
Wherein the elastic member is a dish-shaped leaf spring formed in a ring shape inclined downward or upward in an outward direction from a central axis. The method of claim 3,
Wherein the plurality of elastic members are extruded into the projections in a state that the elastic members are vertically stacked. 3. The method of claim 2,
Wherein the elastic member is a wave-ring type leaf spring formed in a wave shape along the circumferential direction. The method according to claim 1,
Wherein the sealing portion is made of a silicone material. The method according to claim 1,
Wherein the bending portion is bent upward so that the sealing portion is in close contact with a boundary region between the flange portion and the liner. 8. The method of claim 7,
Wherein the pressing portion has at least one pressurizing hole formed therein so that a space formed inside the bending portion of the sealing portion and an inner space of the liner communicate with each other. The method according to claim 1,
Wherein the pressure enhancing portion is fastened to the protruding portion by a screw fastening method.

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