KR100699318B1 - Complex sealing unit for a ultra high pressure vessel - Google Patents

Abstract

The present invention relates to a complex sealing device for blocking the leakage of the high-pressure gas sealed inside the pressure vessel to the outside, more specifically, to increase the sealing effect by allowing the O-ring or spherical ring to be pressurized at a uniform pressure. It relates to a composite sealing device that can be.

The present invention, the wedge ring having a wedge-shaped cross section for insertion is installed in the annular groove formed between the pressure vessel and the pressure vessel lid, an upper backup ring for being installed below the wedge ring, the upper backup ring An o-ring to be installed at a lower portion of the lower ring, a lower backup ring to be installed at a lower portion of the o-ring, a spherical ring to be installed at a lower portion of the lower backup ring, an equal pressure ring to be installed at a lower portion of the spherical ring, In the composite sealing device comprising an equal pressure bearing ring to be fixed to the pressure vessel lid to press the equal pressure ring, at least one groove in the circumferential direction is formed on the surface facing the lower backup ring of the equal pressure bearing ring. And a plurality of through holes formed in communication with the groove from an opposite surface on which the groove is formed.

Pressure vessel, wedge ring, o-ring, backup ring, groove

Description

Compound sealing device for ultra high pressure container {COMPLEX SEALING UNIT FOR A ULTRA HIGH PRESSURE VESSEL}

1 is a perspective view of one embodiment of a composite sealing device for ultra-high pressure container according to the present invention

2 is a cross-sectional view showing a state in which the composite sealing device of the embodiment of FIG.

3 is a cross-sectional view of a portion corresponding to FIG. 2 of another embodiment of the present invention;

Figure 4 is a cross-sectional view of a conventional composite sealing device installed

<Short description of drawing symbols>

10 Pressing ring 11 Lower back-up ring

12 O-ring 13 Wedge Ring

14 Volt 15 Pressure Vessel Body

16 Pressure vessel lid 20 Equal pressure support ring

21 Evenly Pressurized Ring 22 Spherical Ring

23 Upper backup ring 24 Through hole

25 round groove 26 spherical ring sealing contact

27 O-ring sealing contact 28 Wedge ring sealing contact

The present invention relates to a composite sealing device for blocking the leakage of the high-pressure gas sealed inside the pressure vessel to the outside, and more specifically, it is possible to press the O-ring or spherical ring at a uniform pressure to increase the sealing effect It relates to a composite sealing device that can be.

Conventional ultrahigh pressure vessel composite sealing device, as shown in Figure 4, the wedge ring having a wedge-shaped cross section for insertion into an annular groove formed between the pressure vessel body 15 and the pressure vessel lid 16 ( 13), an o-ring 12 to be installed below the wedge ring 13, a lower backup ring 11 to be installed below the o-ring 12, and a pressure vessel to pressurize the lower backup ring. Consists of a pressure support ring 10 for being fixed to the lid 16. The wedge ring 13 is made of brass, the lower backing ring 11 and the pressure support ring 10 is made of metal, the O-ring 12 is made of synthetic resin such as PTFE. Conventional composite sealing device having the configuration as described above is the O-ring 12 and the wedge ring by fastening the pressure support ring 10 to the pressure vessel lid 16 with the bolt 14 to press the lower backup ring (11). Provide an initial seal compressive force to (13). After the high pressure gas is filled in the container, the gas pressure inside the pressure vessel is applied directly to the O-ring 12, the O-ring 12 is elastically deformed. The radial component of the elastic deformation reaction force causing the elastic deformation of the O-ring 12 blocks the gas leakage along the sealing gap between the pressure vessel body 15 and the pressure vessel lid 16, The axial component of the power blocks the outflow of gas along the sealing gap between the pressure vessel body 15 and the pressure vessel lid 16 by pressing the wedge ring 13 evenly upward.

However, the conventional composite sealing device as described above blocks the outflow of the low and low pressure gas at the beginning or the end of the sealing action by the sealing compression force initially set by the O-ring 12 and the added elastic deformation reaction force, When the O-ring 12 is exposed directly because the O-ring 12 is out of the elastic limit by the high-pressure gas, the O-ring 12 is damaged due to uneven compression behavior and repeated O-ring extrusion, thereby lowering the sealing force against the high-pressure gas. There is a problem. Particularly, in the conventional composite sealing device, when the high pressure or the ultra high pressure gas is filled, the pressure of the high pressure gas acting on the lower backup ring 11 causes the O-ring 12 to be unevenly pressed in the axial direction. Therefore, a local stress concentration phenomenon occurs along the frictional contact surface where the O-ring and the wedge ring contact each other, which greatly shortens the fatigue life of the O-ring, in particular, the point where the O-ring 12, the wedge ring 13, and the sealing gap meet each other. Accordingly, when the extrusion occurs due to the local elastic compression repulsion, the excessively applied compressive stress on the O-ring 12 greatly reduces the elastic deformation of the O-ring, and the O-ring is broken, thereby increasing the risk of the pressure vessel system due to gas leakage. In addition, as the frequency of opening and closing of the pressure vessel lid increases, the nonuniform compressive stress and extrusion phenomenon locally increased in the O-ring (12) material drastically degrades the durability of the parts, so that the sealing device is frequently used to secure safety due to material fatigue. There is a problem that needs to be exchanged.

In addition, the initial compression ratio applied to the O-ring and the wedge ring during the assembly process depends on the compressive force of the pressure bearing ring and the elastic deformation rebound behavior of the O-ring, which effectively blocks the leakage pressure of the high pressure gas at the beginning or the end to seal against low or medium pressure. Even though the properties of the pressure vessel are maintained, the gas pressure of the pressure vessel always flows asymmetrically through the compound sealing device, so that the elastic deformation behavior pattern of the O-ring becomes unstable, and thus the sealing force behavior of the compressed wedge ring is uneven, resulting in instability. It is highly likely to maintain a sealability. Therefore, as the working time of opening and closing the pressure vessel lid increases, the elastic restoring force of the O-ring naturally decreases, and thus the sealing compression force decreases, causing fatigue phenomenon caused by the fluctuating gas pressure in the pressure vessel, and especially excessively applied gas. In order to take charge of pressure, a local extrusion phenomenon occurs along the sealing gap, and the O-ring is damaged, which may develop into a high-pressure gas leakage problem that threatens the safety of the pressure vessel system by external leakage of high-pressure gas.

As a result, in the conventional composite sealing device, if the role-sharing between the O-ring for low pressure and the wedge ring for high or ultra high pressure works smoothly, the problem of shortening the life of the O-ring due to fatigue cannot occur for a while, but the O-ring is unevenly It is always unstable because it is directly exposed to the gas inside the pressure vessel supplied. This causes the elastic deformation reaction behavior to be non-uniformly, the fatigue of the O-ring itself accumulates, the transmission force applied to the wedge ring is excessively unstable and the contact sealing action is not smooth. The worst-case scenario of gas leakage due to premature failure should always be monitored.

The present invention is to solve the above problems, an object of the present invention is to provide a complex sealing device including a pressure bearing ring that can pressurize the O-ring uniformly when the high-pressure or ultra-high pressure gas is filled in the container. In addition, an object of the present invention is to provide a compound sealing device that can increase the durability of the O-ring by preventing the O-ring is not directly exposed to high pressure gas.

In other words, uniformly distributes the compressive stress applied to the O-ring, and prevents the O-ring from being directly exposed to high-pressure gas, thereby increasing the safety of the sealing structure and sealing gas leakage due to elastic deformation repulsion behavior, preventing extrusion and uniformly It is an object of the present invention to provide a composite sealing device that ensures deformation behavior to effectively prevent leakage of low and medium pressures, and allows the O-ring to pressurize the wedge ring evenly, thereby increasing the sealing effect against high and ultra high pressures. .

The composite sealing device according to the present invention includes a wedge ring having a wedge-shaped cross section for insertion and insertion into an annular groove formed between the pressure vessel and the pressure vessel lid, and an upper backup ring for being installed below the wedge ring; And an o-ring to be installed below the upper backup ring, a lower backup ring to be installed below the o-ring, a spherical ring to be installed below the lower backup ring, and to be installed below the spherical ring. A compound sealing device comprising an equal pressure ring and an equal pressure bearing ring for being fixedly installed on a lid of a pressure vessel so as to pressurize the equal pressure ring, wherein the surface facing the lower backup ring of the equal pressure bearing ring is circumferentially at least in a circumferential direction. One groove is formed, and a plurality of through holes are formed so as to communicate with the groove from the rear surface of the surface on which the groove is formed. And a gong.

The composite sealing device of the present invention is provided with an equally pressurized bearing ring formed with a through hole and a groove for supplying gas pressure, and the lower back-up ring presses the O-ring uniformly by the supplied high-pressure gas to provide uniform elastic deformation of the O-ring. It ensures a uniform sealing compression force in the radial direction to increase the sealing effect.

In addition, the composite sealing device according to the present invention, the upper backup ring for being installed between the wedge ring and the O-ring, the spherical ring installed under the lower backup ring, and the equal pressure ring installed between the spherical ring and the pressure receiving ring. Further comprising, the spherical ring is characterized in that it is made of an elastic material having a larger width than the lower backup ring and the equal pressure ring. In the composite sealing device according to the present invention, the wedge ring is made of brass, the upper backing ring, the lower backing ring, an equal pressure ring is characterized in that made of aluminum or high-strength polymer material.

The equal pressure bearing ring for supplying the initial compressive force to the ultra-high pressure compound sealing unit according to the present invention is provided with a plurality of through holes and a plurality of circular grooves for uniformly supplying the gas pressure supplied in the circumferential direction to equal pressure ring. Is applied to the spherical ring made of polymer and the sealing compression force is applied, and the radial elastic deformation reaction force primarily blocks the gas pressure flowing from the pressure vessel, and the elastic deformation reaction force in the axial direction is the lower backing ring. Evenly in the axial direction, the lower back-up ring blocks the extruded deformation of the spherical ring to ensure the durability of the spherical ring, and the axial behavior of the delivered lower back-up ring and the leaking gas pressure from the spherical ring sealing contact The elastic deformation reaction force generated by compressing the O-ring, while the radial component is in contact with the spherical ring seal Secondary blockage of leakage gas passing through the surface, the axial behavior component blocks the extrusion deformation of the O-ring by the upper backup ring to strengthen the durability of the O-ring, and simultaneously pushes the upper backup ring upward to seal the wedge ring. The contact surface is pressed to perfect compression to ensure the sealing of high or ultra high pressure gas from the O-ring. Here, three sealing parts of the spherical ring, O-ring and wedge ring are combined sealing units that combine the sealing action by the spherical ring, the sealing action by the O-ring and the sealing action by the wedge ring. It is characterized by improving the sealing properties and durability.

The high pressure side wedge ring and O-ring made of metal are connected with the upper backup ring in between, and the O-ring and spherical ring are connected with the lower backup ring in between.The upper and lower backup rings are connected to the wedge ring, O-ring and spherical ring. It distributes the compressive stress uniformly, adjusts the elastic deformation reaction force to operate within the elastic limit to enhance sealing pressure and durability, and increases the elastic deformation reaction force transmitted to the wedge ring to seal the high pressure or ultra high pressure of the wedge ring. It also greatly improves durability while securing power. In particular, the compressive stress uniformly distributed by the spherical ring and the O-ring and the increased elastic deformation reaction force ensure the sealing barrier of leakage gas in two places, improving the reliability, and the increased elastic restoring force is effectively transmitted to the wedge ring. To ensure high or ultra high pressure sealing properties.

The composite sealing unit according to the present invention has an equal pressure bearing ring for assembling each component and providing an initial compression force to the composite sealing unit to block the gas leakage by the high-pressure gas stored in the pressure vessel, the compression uniformity and sealing thereon There is an evenly pressurized ring to ensure the properties, a spherical ring on top of it to block low and medium pressure leakage gas, on top of it there is a uniform backing ring to block uniform elastic deformation behavior and extrusion deformation, There is an O-ring for blocking the low pressure leak gas, there is a uniform elastic deformation behavior and the upper back-up ring for blocking the extrusion strain, there is a wedge ring for blocking the high pressure or ultra high pressure leak gas, respectively. This composite sealing unit bolts the disk-shaped pressure bearing ring to the pressure vessel lid structure for easy assembly and separation between the pressure vessel body and the pressure vessel lid.

According to the present invention, the upper and lower back-up ring is installed to uniformly distribute and reduce the compressive stress applied to the spherical ring and the O-ring, and increase the radial sealing pressure in the elastic deformation reaction force generated by the spherical ring and the O-ring to release the gas. It effectively blocks and increases the axial repulsion behavior uniformly to further enhance the sealing compression force of the high pressure gas by the upper wedge ring. In particular, the lower spherical ring prevents extrusion deformation from occurring by the lower backing ring to secure durability and sealing power, thereby extending the life of the compound sealing unit, as well as blocking the leakage gas flowing into the O-ring to seal the O-ring. Increase performance and durability together.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a perspective view of one embodiment of a composite sealing device for an ultrahigh pressure container according to the present invention, Figure 2 is a cross-sectional view showing a state in which the composite sealing device of the embodiment of Figure 1 is installed, Figure 3 is a view of another embodiment of the present invention It is sectional drawing of the part corresponding to 2.

1 and 2, the composite sealing unit of the present embodiment is equally pressurized bearing ring 20, equal pressure ring 21, spherical ring 22, lower backup ring 11, O-ring 12, upper The backup ring 23 and the wedge ring 13 are assembled in a line along the axial direction in the installation space between the pressure vessel body 15 and the pressure vessel lid 16. In the present embodiment, the wedge ring 13 has a triangular shape represented by various inclinations, the spherical ring 22 has a rectangular shape, the O-ring 12 has a round shape and a wave shape, the backup ring has a rectangular shape, and the equal pressure ring 21. The silver rectangular shape, the equal pressure receiving ring 20 is a structure having a plurality of circumferential through holes 24 and a plurality of circular grooves 25 processed in the circumferential direction are produced at equal intervals.

In FIG. 2, most of the high-pressure gas supplied from inside the pressure vessel flows out through the plurality of through holes 24 and the circular groove 25 processed in the equal pressure bearing ring 20 for supplying the initial compression force. The ring 21 is lifted up to apply a uniform gas pressure to the spherical ring 22 by means of gas pressure, but some of the leaking gas may enter the space of the o-ring 12 along the spherical ring sealing contact surface 26. . The compression force by the gas pressure transmitted from the equal pressure ring 21 is the compression ring deformed spherical ring 22 is already compressed in the initial dotted line in the process of assembling the composite sealing unit, the elastic deformation reaction force occurs while some of the spherical ring sealing While the contact surface 26 is further compressed to increase the sealability, some of it lifts the lower back-up ring 11 to compress the O-ring 12 while some of the elastically deformed reaction forces generated in the O-ring 12 are radially. Promotes further compression to act as a sealing force to block the leakage of gas passing through the O-ring sealing contact surface 27, and the rest pushes the upper backup ring 23 upward to push the wedge ring 13 into the wedge ring sealing contact surface 28. ) To further compress to block the ultra-high pressure gas leakage through the wedge ring sealing contact surface 28 to ensure sealing. The lower backup ring 11 and the upper backup ring 23 uniformly distribute and relax the local compressive stresses applied to the spherical ring 22 and the O-ring 12, and at the same time increase the sealing force acting in the radial direction, The pressing seal of the wedge ring 13 is increased to increase the high or ultra high pressure seal. In particular, by installing the lower spherical ring 22 and the upper O-ring 12, the compressive stress applied to them is uniformly distributed and reduced, but the radial compressive sealability increases to two points and the radial compressive compressive force is increased. Since it is stably dispersed, durability is greatly increased, and the upper wedge ring 13 is further compressed in a radial direction to pressurize the pressure vessel body 15 and the wedge ring 13, and the wedge ring 13 and the pressure vessel lid 16. By sealing the sealing gap completely, the structure behavior is improved evenly and the durability is greatly improved while keeping the compressive stress low.

According to the present invention described above, the composite sealing unit provided with the wedge ring, the upper backup ring, the O-ring, the lower backup ring, the spherical ring, the equal pressure ring, and the equal pressure bearing ring further strengthens the initial sealing compression force by the spherical ring and the O-ring. It effectively seals the low and medium pressure, and at the same time, the backup ring and the equal pressure ring are installed to prevent the uniform compressive stress distribution and the extrusion deformation, so the durability by the fatigue of the spherical ring made of polymer and O-ring is improved, and the elastic deformation While the reaction force works smoothly, the compressive force transmitted to the metal wedge ring is more balanced, which greatly improves the ultrahigh pressure sealability of the wedge ring. In addition, the compression stress applied to the spherical ring and the O-ring is greatly alleviated, and its own compressive force expands in the radial direction so that the sealing pressure for leaking gas such as low pressure or medium pressure is handled at two sealing contact surfaces, which is larger than the conventional sealing device. safe.

In particular, the equal pressure ring installed under the spherical ring and the equal pressure bearing ring for applying the initial compression force are spherical by the equal pressure ring through the plurality of through holes and the circular groove of the pressure bearing ring. The ring acts to increase the uniform sealing pressure in the radial direction, and at the same time the uniform pressure of the gas is applied to the backup ring and the O-ring, so as to secure the metal contact ultra high pressure sealing action of the wedge ring as much as possible by the elastic deformation reaction force. Sealing units, from low to ultra high pressure, provide a complete seal and greatly improve component durability.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (3)

A wedge ring having a wedge-shaped cross section for insertion and insertion into an annular groove formed between the pressure vessel and the pressure vessel lid, an o-ring for installation in the lower portion of the wedge ring, and a lower back-up for installation in the lower portion of the o-ring In the composite sealing device comprising a ring and an equal pressure bearing ring for being fixed to the pressure vessel lid to press the lower backup ring, At least one groove is formed in a circumferential direction on a surface facing the lower backup ring of the equal pressure bearing ring, and a plurality of through holes are formed to communicate with the groove from the rear surface of the surface on which the groove is formed. Device. The method of claim 1, An upper backup ring for being installed between the wedge ring and the o-ring, A spherical ring installed under the lower backup ring; Further comprising an equal pressure ring installed between the spherical ring and the equal pressure bearing ring, The spherical ring is a composite sealing device, characterized in that made of an elastic material having a larger width than the lower backup ring and the equal pressure ring. The method of claim 2, The wedge ring is made of a nonferrous metal such as brass, The upper backup ring, the lower backup ring, the equal pressure ring is a composite sealing device, characterized in that made of aluminum or high-strength polymer material.

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