Sealing structure suitable for ultrahigh pressure container

Abstract

The invention discloses a sealing structure suitable for an ultrahigh pressure container. A sealing area A is arranged at a pressure loading end between the inner wall of a cylinder and a sealing head, and a sealing area B is arranged in the direction far away from the pressure loading direction; in the sealing area A, the pressure loading end of the sealing head is provided with a circle of concave table, the end, away from the pressure loading direction, of the concave table is an inclined face a, an included angle a is formed between the inclined face a and the inner wall of the barrel, the pressure loading end of the sealing head is detachably connected with a gland, and a first sealing assembly or a second sealing assembly is installed in the concave table in a replaceable mode. The first sealing assembly comprises a metal triangular pad and a rubber sealing ring a. The second sealing assembly comprises a check ring and an elastic energy storage ring. In the sealing area B, a section of outer inclined plane is arranged on the outer side of the sealing head, a section of inner inclined plane is arranged on the inner wall of the cylinder, an included angle b is formed between the outer inclined plane and the inner inclined plane, and the threaded pressing ring, the pressing ring, the metal elastic ring and the rubber sealing ring b are sequentially arranged close to one another in the pressure loading direction. The structure can ensure the sealing reliability under various working conditions and is convenient to disassemble and assemble.

Description

Technical Field

[0001] The present invention relates to a pressure vessel, and in particular to a sealing structure suitable for an ultra-high pressure vessel. Background Art

[0002] Whether a pressure vessel can operate normally depends largely on the reliability of its sealing structure. For ultra-high pressure vessels, when they are large in size, have multiple working conditions (high temperature and ultra-high pressure, high pressure pulse, ultra-high pressure long-term pressure maintenance), and need to be opened frequently, their sealing structure must not only ensure sufficient sealing diameter, but also ensure reliability under various working conditions (especially reliability under ultra-high pressure conditions), and be easy to disassemble and assemble.

[0003] However, the current sealing structure of ultra-high pressure containers is often only designed for ultra-high pressure working conditions and is inconvenient to disassemble and assemble. Summary of the Invention

[0004] The object of the present invention is to provide a sealing structure suitable for an ultra-high pressure container, which can ensure sealing reliability under various working conditions and is easy to assemble and disassemble.

[0005] The technical solution adopted in the present invention is: A sealing structure suitable for ultra-high pressure containers, wherein a sealing area A and a sealing area B are provided between the inner wall of the cylinder and the sealing head, the sealing area A is at the pressure loading end, and the sealing area B is away from the pressure loading direction; in the sealing area A, a circle of concave platforms are provided at the pressure loading end of the sealing head, the end of the concave platform away from the pressure loading direction is an inclined surface a, and the inclined surface a forms an included angle a with the inner wall of the cylinder, the pressure loading end of the sealing head is detachably connected to the pressure cover, and a sealing component 1 or a sealing component 2 is replaceably installed in the concave platform; the sealing component 1 includes a metal triangular gasket and a rubber sealing ring a, the end of the metal triangular gasket away from the pressure loading direction is a wedge-shaped sealing angle, and the end close to the pressure loading direction is a pressure-bearing surface a, when installed, the wedge-shaped sealing angle extends into the included angle a and the two sides are sealed with the included angle a, the pressure cover presses the rubber sealing ring a against the pressure-bearing surface a, the rubber sealing ring a is stuck between the side of the concave platform and the inner wall of the cylinder, and there is a gap between the pressure cover and the inner wall of the cylinder; the sealing The second sealing component includes a retaining ring and an elastic energy storage ring. The end of the retaining ring away from the pressure loading direction is matched with the angle a, and the end close to the pressure loading direction is the limiting surface. The opening of the elastic energy storage ring faces the pressure loading direction. During installation, the retaining ring extends into the angle a and matches the angle a. The elastic energy storage ring is interference-fitted between the side of the concave platform and the inner wall of the cylinder and is axially limited by the limiting surface. There is a gap between the pressure cover and the elastic energy storage ring and the inner wall of the cylinder; in the sealing area B, an outer bevel is provided on the outside of the sealing head, and an inner bevel is provided on the inner wall of the cylinder. The outer bevel and the inner bevel form an angle b. The threaded pressure ring, the clamping ring, the metal elastic ring and the rubber sealing ring b are arranged in sequence close to the pressure loading direction. The metal elastic ring extends into the angle b and is in contact and sealed with the angle b on both sides. The threaded pressure ring is threadedly installed at the end of the cylinder and the metal elastic ring is clamped by the clamping ring. The rubber sealing ring b is installed in the ring groove on the side of the sealing head and is pressed on the inner wall of the cylinder. Preferably, there is a notch at the tip of the metal triangular pad, and there is a gap between the notch and the tip of the angle a.

[0006] Preferably, the gland is mounted on the pressure-loading end of the sealing head by bolts.

[0007] Preferably, the end of the pressure ring away from the pressure loading direction is the pressure-bearing surface b, the end close to the pressure loading direction is the pressure-transmitting surface one, and the inward side is the guide surface one. The threaded pressure ring is fitted and pressed on the pressure-bearing surface b, and the guide surface one is fitted with the side of the sealing head. The end of the metal elastic ring away from the pressure loading direction is the pressure-transmitting surface two, the end close to the pressure loading direction is a sharp angle, the inward side is the guide surface two and the sealing surface, and the outward side is the wire embedded surface. The pressure-transmitting surface one is fitted and pressed on the pressure-transmitting surface two. The pressure-transmitting surface one and the pressure-transmitting surface two are inclined and can transmit the downward pressure and the outward direction to the metal elastic ring. The sharp angle extends into the included angle b. The guide surface two is away from the pressure loading direction relative to the sealing surface. The guide surface two is fitted with the side of the sealing head. The guide surface one and the guide surface two both play a role of axial guidance. The sealing surface is inclined and pressed and contacted on the outer inclined surface. The wire embedded surface is inclined and inlaid with a full circle of copper wire, and the copper wire is pressed and contacted on the inner inclined surface.

[0008] Preferably, there is a gap between the sharp angle and the tip of the angle b; there is an angle difference between the sealing surface and the outer bevel, and the inclination angle of the sealing surface is smaller than the inclination angle of the outer bevel; there is an angle difference between the wire embedded surface and the inner bevel, and the inclination angle of the wire embedded surface is smaller than the inclination angle of the inner bevel.

[0009] Preferably, the wire embedding surface is inlaid with two circles of copper wire, the copper wire is close to the sharp corner, and the diameter of the copper wire is 2 mm.

[0010] Preferably, during operation, for sealing area A, sealing component one or sealing component two is selected according to the working conditions. Sealing component one is selected under working conditions where temperature and pressure fluctuate, and sealing component two is selected under working conditions where temperature and pressure do not fluctuate.

[0011] Preferably, when assembling the sealing assembly, first put the metal triangular gasket on the concave platform and let the inner side of the wedge-shaped sealing angle stick to the inclined surface a, then put the rubber sealing ring a on the concave platform and let the rubber sealing ring a stick to the pressure surface a, then install the pressure cover on the pressure loading end of the sealing head, so that the pressure cover presses the rubber sealing ring a against the pressure surface a, providing pre-tightening force for the metal triangular gasket, and then install the sealing head on the cylinder so that the two sides of the wedge-shaped sealing angle fit the angle a for sealing, and the rubber sealing ring a is stuck between the side of the concave platform and the inner wall of the cylinder.

[0012] Preferably, when assembling the sealing component 2, first put the retaining ring on the concave platform and let the inner side of the retaining ring stick to the inclined surface a, then put the elastic energy storage ring on the concave platform and axially limit the elastic energy storage ring through the limiting surface, clamp the elastic energy storage ring on the sealing head, then install the pressure cover on the pressure loading end of the sealing head, and then install the sealing head on the cylinder so that the elastic energy storage ring is interference-fitted between the side of the concave platform and the inner wall of the cylinder.

[0013] Preferably, when assembling the components at the sealing area B, first install the rubber sealing ring b in the side ring groove of the sealing head, put the metal elastic ring on the sealing head and let the inner side of the metal elastic ring contact the outer inclined surface, put the clamping ring on the sealing head and let the end of the clamping ring close to the pressure loading direction contact the end of the metal elastic ring away from the pressure loading direction, then install the sealing head on the cylinder body so that the rubber sealing ring b is pressed against the inner wall of the cylinder, and then thread the threaded compression ring on the end of the cylinder body so that the threaded compression ring presses the metal elastic ring through the compression ring, and both sides of the metal elastic ring are in contact with the angle b for sealing.

[0014] The beneficial effects of the present invention are: This structure improves the pressure loading end of the sealing head, and the design of the concave platform and the pressure cover allows the sealing component 1 or the sealing component 2 to be smoothly replaced with each other. The sealing component 1 adopts the structure of metal triangular pad + rubber sealing ring a. The metal triangular pad is an axial self-tightening seal, and the rubber sealing ring a provides the metal triangular pad with the initial sealing pre-tightening force. When the internal medium pressure increases, the rubber sealing ring a tends to move toward the metal triangular pad, thereby pressing the metal triangular pad. The higher the internal pressure, the greater the sealing force. It will not be affected by temperature and pressure fluctuations and is suitable for temperature and pressure fluctuations. In working conditions where there are fluctuations in force, the sealing component 2 adopts the structure of elastic energy storage ring + retaining ring. The elastic energy storage ring is a radial self-tightening seal. The retaining ring is used to fill the wedge-shaped part of the recess and provide axial limit for the elastic energy storage ring. Its function is to increase the interchangeability of sealing component 1 and sealing component 2. The elastic energy storage ring uses interference design to achieve initial preload. When the internal medium pressure increases, its sealing lip will fit more closely, and the higher the internal pressure, the greater the sealing force. It is suitable for working conditions where there are no fluctuations in temperature and pressure. Therefore, this structure can ensure sealing reliability under various working conditions.

[0015] After improving the pressure loading end of the sealing head, this structure sequentially places the components of sealing assembly 1 or sealing assembly 2, and then installs the pressure cover to complete the assembly of sealing area A. In sealing area B, this structure sequentially places the rubber sealing ring b, the metal elastic ring and the compression ring, and finally threads the threaded compression ring to complete the assembly of sealing area B, which is convenient for assembly and disassembly.

[0016] The structure sets sealing area A and sealing area B at the pressure loading end and away from the pressure loading direction respectively. On the whole, the near pressure end adopts metal triangular pad or elastic energy storage ring to achieve self-tightening sealing, the middle adopts rubber sealing ring b to achieve sealing ring sealing, and the far pressure end adopts metal elastic ring to achieve self-tightening sealing. The metal triangular pad or elastic energy storage ring bears most of the main pressure and temperature (tests have shown that the elastic energy storage ring can be used in high temperature and ultra-high pressure test environments of 250°C and 200MPa, while the metal triangular pad can be used in test environments with higher temperature and pressure), and the rubber sealing ring b and the metal elastic ring bear the pressure that may leak. It has three sealing layers, which increases the sealing redundancy. In addition, the clamping force provided by the threaded pressure ring at the far pressure end can also adjust the sealing effect of the metal triangular pad or elastic energy storage ring at the near pressure end, avoiding the disadvantage that the near pressure end cannot be actively regulated.

[0017] The structure is provided with a metal triangular pad or an elastic energy storage ring at the pressure loading end, and the metal triangular pad or the elastic energy storage ring bears most of the main pressure and temperature. Since there is redundancy between the metal triangular pad and the rubber sealing ring a, the metal triangular pad is small in size and mostly made of soft metal material, so the metal triangular pad is easy to disassemble and assemble, and the contact surface will not be damaged even if it is disassembled and assembled multiple times in time. The elastic energy storage ring has an elastic structure and there is no problem of damaging the contact surface. Whether it is a metal triangular pad seal or an elastic energy storage ring seal, it can be reused many times. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 Schematic diagram of a sealing structure suitable for an ultra-high pressure container in Embodiment 1 of the present invention.

[0020] Figure 2 for Figure 1 A larger picture of the hair at center A.

[0021] Figure 3 for Figure 2 Schematic diagram of the splitting.

[0022] Figure 4 for Figure 1 A larger picture of the hair at B in the middle.

[0023] Figure 5 for Figure 4 Schematic diagram of the splitting.

[0024] Figure 6This is a partial schematic diagram of a sealing structure applicable to an ultra-high pressure container in the second embodiment of the present invention, in which the sealing component 1 is replaced by the sealing component 2.

[0025] Figure 7 for Figure 6 Schematic diagram of the splitting.

[0026] In the figure: 1-cylinder; 101-inner bevel; 2-sealing head; 201-concave platform; 202-bevel a; 203-outer bevel; 204-ring groove; 3-threaded pressure ring; 4-pressure cover; 5-bolt; 6-metal triangular gasket; 601-wedge-shaped sealing angle; 602-pressure surface a; 7-rubber sealing ring a; 8-metal elastic ring; 801-pressure transmission surface 2; 802-pointed corner; 803-guide surface 2; 804-sealing surface; 805-threaded surface; 9-pressure ring; 901-pressure transmission surface b; 902-pressure transmission surface 1; 903-guide surface 1; 10-copper wire; 11-rubber sealing ring b; 12-elastic energy storage ring; 13-retaining ring; 1301-limiting surface. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "sealing area A", "sealing area B", "inclined surface a", "angle a", "angle b", "rubber sealing ring a", "rubber sealing ring b", "pressure surface a", "pressure surface b", "pressure transmission surface one", "pressure transmission surface two", "guide surface one", "guide surface two", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0031] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0033] Example 1 This application discloses a sealing structure suitable for ultra-high pressure containers, such as Figure 1 As shown, a sealing area A and a sealing area B are provided between the inner wall of the cylinder 1 and the sealing head 2. The sealing area A is at the pressure loading end, and the sealing area B is away from the pressure loading direction; and: In the sealing area A, if Figures 1 to 3 As shown, the pressure-loading end of the sealing head 2 is provided with a circle of concave platforms 201. The end of the concave platforms 201 away from the pressure-loading direction is an inclined surface a202. The inclined surface a202 forms an angle a with the inner wall of the cylinder 1. The pressure-loading end of the sealing head 2 is detachably connected to the gland 4. The sealing assembly 1 or the sealing assembly 2 is replaceably installed in the concave platforms 201. In this embodiment, a sealing component 1 is installed in the recess 201, such as Figure 2 and Figure 3 As shown, sealing assembly 1 includes a metal triangular gasket 6 and a rubber sealing ring a7. The end of the metal triangular gasket 6 away from the pressure loading direction is a wedge-shaped sealing angle 601, and the end close to the pressure loading direction is a pressure-bearing surface a602. During installation, the wedge-shaped sealing angle 601 extends into the angle a and both sides are sealed with the angle a. The gland 4 presses the rubber sealing ring a7 against the pressure-bearing surface a602. The rubber sealing ring a602 is stuck between the side of the concave platform 201 and the inner wall of the cylinder 1, and a gap exists between the gland 4 and the inner wall of the cylinder 1. In the sealing area B, if Figure 1 、 Figure 4 and Figure 5 As shown, the outer side of the sealing head 2 is provided with an outer bevel 203, and the inner wall of the cylinder 1 is provided with an inner bevel 101. The outer bevel 203 and the inner bevel 101 form an angle b. The threaded pressure ring 3, the clamping ring 9, the metal elastic ring 8 and the rubber sealing ring b11 are arranged in sequence in the direction of pressure loading. The metal elastic ring 8 extends into the angle b and contacts and seals with the angle b on both sides. The threaded pressure ring 3 is threadedly installed at the end of the cylinder 1 and the metal elastic ring 8 is compressed by the clamping ring 9. The rubber sealing ring b11 is installed in the annular groove 204 on the side of the sealing head 2 and is compressed on the inner wall of the cylinder 1.

[0034] Regarding the sealing area A, preferably: In order to avoid damage during disassembly and assembly and to reserve space for extrusion and deformation, in this embodiment, Figure 2 and Figure 3 As shown, there is a notch at the tip 601 of the metal triangular pad 6 , and there is a gap between the notch and the tip of the angle a.

[0035] like Figure 2 As shown, the gland 4 can be mounted on the pressure-loading end of the sealing head 2 by means of bolts 5 .

[0036] When assembling the sealing assembly, first put the metal triangular gasket 6 on the concave platform 201 and let the inner side of the wedge-shaped sealing angle 601 stick to the inclined surface a202, then put the rubber sealing ring a7 on the concave platform 201 and let the rubber sealing ring a7 stick to the pressure surface a602, then install the pressure cover 4 on the pressure loading end of the sealing head 2, so that the pressure cover 2 presses the rubber sealing ring a7 on the pressure surface a602 to provide pre-tightening force for the metal triangular gasket 6, and then install the sealing head 2 on the cylinder 1, so that the two sides of the wedge-shaped sealing angle 601 fit the angle a for sealing, and the rubber sealing ring a7 is stuck between the side of the concave platform 201 and the inner wall of the cylinder 1.

[0037] Regarding the sealing area B, preferably: like Figure 4 and Figure 5As shown, the end of the compression ring 9 away from the pressure loading direction is the pressure surface b901, the end close to the pressure loading direction is the pressure transmission surface 1 902, and the inward side is the guide surface 1 903. The threaded compression ring 3 fits and presses on the pressure surface b901, and the guide surface 1 903 fits on the side of the sealing head 2. The end of the metal elastic ring 8 away from the pressure loading direction is the pressure transmission surface 2 801, the end close to the pressure loading direction is the sharp corner 802, the inward side is the guide surface 2 803 and the sealing surface 804, and the outward side is the wire embedding surface 805. The pressure transmission surface 1 902 fits and presses on the transmission surface On the second pressure surface 801, the first and second pressure transmission surfaces 902 and 802 are inclined and can transmit downward and outward pressure to the metal elastic ring 8. The sharp corner 802 extends into the angle b. The second guide surface 803 is away from the pressure loading direction relative to the sealing surface 804. The second guide surface 803 is in contact with the side of the sealing head 2. Both the first and second guide surfaces 903 and 803 serve as axial guides. The sealing surface 804 is inclined and presses against the outer inclined surface 203. The wire-inserting surface 805 is inclined and inlaid with a full coil of copper wire 10, which presses against the inner inclined surface 101. The sealing surfaces 804 and wire-inserting surfaces 805 on both sides of the metal elastic ring 8 are both squeezed and contact sealed. The copper wire 10 embedded in the wire-inserting surface 805 deforms first to achieve an initial seal. By wearing out the copper wire 10, the overall service life of the metal elastic ring 8 is extended. When the copper wire 10 fails, it can be replaced.

[0038] like Figure 4 and Figure 5 As shown, there is a gap between the sharp corner 802 and the tip of angle b; there is an angular difference between the sealing surface 804 and the outer bevel 203, with the inclination angle of the sealing surface 804 being smaller than that of the outer bevel 203; there is an angular difference between the thread-embedded surface 805 and the inner bevel 101, with the inclination angle of the thread-embedded surface 805 being smaller than that of the inner bevel 101. This arrangement not only facilitates the assembly and disassembly of the metal elastic ring 8, but also prevents collisions caused by the sharp corner 802 and leaves room for extrusion deformation.

[0039] like Figure 4 and Figure 5 As shown, the wire embedding surface 805 is embedded with two circles of copper wire 10 , the copper wire 10 is close to the sharp corner 802 , and the diameter of the copper wire 10 is about 2 mm.

[0040] When assembling the components at the sealing area B, first install the rubber sealing ring b11 in the side ring groove 204 of the sealing head 2, put the metal elastic ring 8 on the sealing head 2 and let the inner side of the metal elastic ring 8 contact the outer inclined surface 203, put the clamping ring 9 on the sealing head 2 and let the clamping ring 9 close to the pressure loading end contact the metal elastic ring 8 away from the pressure loading direction, then install the sealing head 2 on the cylinder 1, so that the rubber sealing ring b11 is pressed against the inner wall of the cylinder 1, and then threadedly install the threaded pressure ring 3 on the end of the cylinder 1, so that the threaded pressure ring 3 presses the metal elastic ring 8 through the clamping ring 9, and the two sides of the metal elastic ring 8 are in contact with the angle b for sealing.

[0041] Example 2 This embodiment discloses another sealing structure suitable for ultra-high pressure containers. The difference between this embodiment and the first embodiment is that in this embodiment, a sealing component 2 is installed in the recess 201. Figure 6 and Figure 7 As shown, the second sealing component includes a retaining ring 13 and an elastic energy storage ring 12. The end of the retaining ring 13 away from the pressure loading direction matches the angle a, and the end close to the pressure loading direction is a limiting surface 1301. The opening of the elastic energy storage ring 12 faces the pressure loading direction. During installation, the retaining ring 13 extends into the angle a and matches the angle a. The elastic energy storage ring 12 is interference-fitted between the side of the concave platform 201 and the inner wall of the cylinder 1 and is axially limited by the limiting surface 1301. There is a gap between the gland 4 and the elastic energy storage ring 12 and the inner wall of the cylinder 1. When assembling the second sealing component, first put the retaining ring 13 on the concave platform 201 and let the inner side of the retaining ring 13 stick to the inclined surface a202, then put the elastic energy storage ring 12 on the concave platform 201 and axially limit the elastic energy storage ring 12 through the limiting surface 1301, clamp the elastic energy storage ring 12 on the sealing head 2, then install the pressure cover 4 on the pressure loading end of the sealing head 2, and then install the sealing head 2 on the cylinder 1, so that the elastic energy storage ring 12 is interference fitted between the side of the concave platform 201 and the inner wall of the cylinder 1.

[0042] Combining the first and second embodiments, the structure improves the pressure loading end of the sealing head 2, and the design of the recessed platform 201 and the pressure cover 4 allows the sealing component 1 or the sealing component 2 to be smoothly replaced with each other. During operation, for the sealing area A, the sealing component 1 or the sealing component 2 can be selected according to the working conditions. The sealing component 1 is preferred under the working conditions where the temperature and pressure fluctuate, and the sealing component 2 is preferred under the working conditions where the temperature and pressure do not fluctuate. Among them: the sealing component 1 adopts the structure of metal triangular gasket 6 + rubber sealing ring a7, the metal triangular gasket 6 is an axial self-tightening seal, and the rubber sealing ring a7 provides the metal triangular gasket 6 with an initial sealing pre-tightening force. When the internal medium pressure increases, the rubber sealing ring a7 has a tendency to tighten toward the metal triangular gasket 6. The triangular gasket 6 tends to move, thereby pressing the metal triangular gasket 6. The higher the internal pressure, the greater the sealing force. It will not be affected by temperature and pressure fluctuations and is suitable for working conditions with temperature and pressure fluctuations. The second sealing component adopts the structure of elastic energy storage ring 12 + retaining ring 13. The elastic energy storage ring 12 is a radial self-tightening seal. The retaining ring 13 is used to fill the wedge-shaped part of the concave platform 201 and provide axial limit for the elastic energy storage ring 12. Its function is to increase the interchangeability of the first and second sealing components. The elastic energy storage ring 12 uses an interference design to achieve the initial preload. When the internal medium pressure increases, its sealing lip will fit more closely. The higher the internal pressure, the greater the sealing force. It is suitable for working conditions without temperature and pressure fluctuations. Therefore, this structure can ensure the sealing reliability under various working conditions.

[0043] After improving the pressure loading end of the sealing head 2, this structure sequentially places the components of the sealing assembly 1 or the sealing assembly 2, and then installs the pressure cover 4 to complete the assembly at the sealing area A. In the sealing area B, this structure sequentially places the rubber sealing ring b11, the metal elastic ring 8 and the clamping ring 9, and finally threads the threaded pressure ring 3 to complete the assembly at the sealing area B, which is convenient for assembly and disassembly.

[0044] The structure is respectively provided with sealing area A and sealing area B at the pressure loading end and away from the pressure loading direction. On the whole, the metal triangular pad 6 or the elastic energy storage ring 12 is used for self-tightening sealing at the near pressure end, the rubber sealing ring b11 is used for sealing ring sealing in the middle, and the metal elastic ring 8 is used for self-tightening sealing at the far pressure end. The metal triangular pad 6 or the elastic energy storage ring 12 bears most of the main pressures and temperatures (experiments have shown that the elastic energy storage ring 12 can be applied to high-temperature and ultra-high-pressure test environments of 250°C and 200MPa, while the metal triangular pad 6 can be applied to test environments with higher temperature and pressure), and the rubber sealing ring b11 and the metal elastic ring 8 bear the pressure that may leak. It has three sealing layers, which increases the sealing redundancy. In addition, the clamping force provided by the threaded pressure ring 3 at the far pressure end can also adjust the sealing effect of the metal triangular pad 6 or the elastic energy storage ring 12 at the near pressure end, avoiding the disadvantage that the near pressure end cannot be actively regulated.

[0045] The structure is provided with a metal triangular pad 6 or an elastic energy storage ring 12 at the pressure loading end, and the metal triangular pad 6 or the elastic energy storage ring 12 bears most of the main pressure and temperature. Since there is redundancy between the metal triangular pad 6 and the rubber sealing ring a7, the metal triangular pad 6 is small in size and mostly made of soft metal material. Therefore, the metal triangular pad 6 is easy to disassemble and assemble, and the contact surface will not be damaged even if it is disassembled and assembled multiple times in time. The elastic energy storage ring 12 has an elastic structure and there is no problem of damaging the contact surface. Whether the metal triangular pad 6 is sealed or the elastic energy storage ring 12 is sealed, it can be reused many times.

[0046] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A sealing structure suitable for an ultra-high pressure container, characterized by: A sealing area A and a sealing area B are provided between the inner wall of the cylinder and the sealing head, the sealing area A is at the pressure loading end, and the sealing area B is away from the pressure loading direction; in the sealing area A, a circle of concave platforms are provided at the pressure loading end of the sealing head, and the end of the concave platform away from the pressure loading direction is an inclined surface a, and the inclined surface a forms an included angle a with the inner wall of the cylinder, the pressure loading end of the sealing head is detachably connected to the pressure cover, and the sealing component 1 or the sealing component 2 is replaceably installed in the concave platform; the sealing component 1 includes a metal triangular gasket and a rubber sealing ring a, the end of the metal triangular gasket away from the pressure loading direction is a wedge-shaped sealing angle, and the end close to the pressure loading direction is a pressure surface a, when installed, the wedge-shaped sealing angle extends into the included angle a and the two sides are sealed with the included angle a, the pressure cover presses the rubber sealing ring a against the pressure surface a, the rubber sealing ring a is stuck between the side of the concave platform and the inner wall of the cylinder, and there is a gap between the pressure cover and the inner wall of the cylinder; the sealing component 2 includes a retaining ring And the elastic energy storage ring, the end of the retaining ring away from the pressure loading direction matches the angle a, and the end close to the pressure loading direction is the limiting surface. The opening of the elastic energy storage ring faces the pressure loading direction. During installation, the retaining ring extends into the angle a and cooperates with the angle a. The elastic energy storage ring is interference-installed between the side of the concave platform and the inner wall of the cylinder and is axially limited by the limiting surface. There is a gap between the pressure cover and the elastic energy storage ring and the inner wall of the cylinder; in the sealing area B, an outer bevel is provided on the outside of the sealing head, and an inner bevel is provided on the inner wall of the cylinder. The outer bevel and the inner bevel form an angle b. The threaded pressure ring, the clamping ring, the metal elastic ring and the rubber sealing ring b are arranged in sequence close to the pressure loading direction. The metal elastic ring extends into the angle b and is in contact and sealed with the angle b on both sides. The threaded pressure ring is threadedly installed at the end of the cylinder and the metal elastic ring is clamped by the clamping ring. The rubber sealing ring b is installed in the ring groove on the side of the sealing head and is pressed on the inner wall of the cylinder.

2. The sealing structure for an ultra-high pressure container according to claim 1, wherein: There is a notch at the tip of the metal triangular pad, and there is a gap between the notch and the tip of the angle a.

3. The sealing structure for an ultra-high pressure container according to claim 1, wherein: The gland is installed on the pressure-loading end of the sealing head by bolts.

4. The sealing structure for an ultra-high pressure container according to claim 1, wherein: The end of the compression ring away from the pressure loading direction is the pressure surface b, the end close to the pressure loading direction is the pressure transmission surface one, and the inward side is the guide surface one. The threaded compression ring is fitted and pressed on the pressure surface b, and the guide surface one is fitted with the side of the sealing head. The end of the metal elastic ring away from the pressure loading direction is the pressure transmission surface two, the end close to the pressure loading direction is a sharp angle, the inward side is the guide surface two and the sealing surface, and the outward side is the wire embedded surface. The pressure transmission surface one is fitted and pressed on the pressure transmission surface two. The pressure transmission surface one and the pressure transmission surface two are inclined and can transmit the downward pressure and the outward direction to the metal elastic ring. The sharp angle extends into the angle b. The guide surface two is away from the pressure loading direction relative to the sealing surface. The guide surface two is fitted with the side of the sealing head. The guide surface one and the guide surface two both play a role of axial guidance. The sealing surface is inclined and pressed and contacted on the outer inclined surface. The wire embedded surface is inclined and inlaid with a full circle of copper wire, and the copper wire is pressed and contacted on the inner inclined surface.

5. The sealing structure for an ultra-high pressure container according to claim 4, wherein: There is a gap between the sharp angle and the tip of the angle b; there is an angle difference between the sealing surface and the outer bevel, and the inclination angle of the sealing surface is smaller than the inclination angle of the outer bevel; There is an angle difference between the wire embedding surface and the inner bevel surface, and the inclination angle of the wire embedding surface is smaller than the inclination angle of the inner bevel surface.

6. The sealing structure for an ultra-high pressure container according to claim 4, wherein: The inlaid wire surface is inlaid with two circles of copper wire, the copper wire is close to the sharp corner, and the diameter of the copper wire is 2mm.

7. The sealing structure for an ultra-high pressure container according to claim 1, wherein: During operation, for sealing area A, sealing component 1 or sealing component 2 is selected according to the working conditions. Sealing component 1 is selected under working conditions where temperature and pressure fluctuate, and sealing component 2 is selected under working conditions where temperature and pressure do not fluctuate.

8. The sealing structure for an ultra-high pressure container according to claim 1 or 7, wherein: When assembling the sealing assembly, first put the metal triangular gasket on the concave platform and let the inner side of the wedge-shaped sealing angle stick to the inclined surface a, then put the rubber sealing ring a on the concave platform and let the rubber sealing ring a stick to the pressure surface a, then install the pressure cover on the pressure loading end of the sealing head, so that the pressure cover presses the rubber sealing ring a against the pressure surface a, providing pre-tightening force for the metal triangular gasket, and then install the sealing head on the cylinder so that the two sides of the wedge-shaped sealing angle fit the angle a for sealing, and the rubber sealing ring a is stuck between the side of the concave platform and the inner wall of the cylinder.

9. The sealing structure for an ultra-high pressure container according to claim 1 or 7, wherein: When assembling the second sealing component, first put the retaining ring on the concave platform and let the inner side of the retaining ring stick to the inclined surface a, then put the elastic energy storage ring on the concave platform and limit the elastic energy storage ring axially through the limiting surface, clamp the elastic energy storage ring on the sealing head, then install the pressure cover on the pressure loading end of the sealing head, and then install the sealing head on the cylinder so that the elastic energy storage ring is interference fitted between the side of the concave platform and the inner wall of the cylinder.

10. The sealing structure for an ultra-high pressure container according to claim 1, wherein: When assembling the components at the sealing area B, first install the rubber sealing ring b in the side ring groove of the sealing head, put the metal elastic ring on the sealing head and let the inner side of the metal elastic ring contact the outer inclined surface, put the clamping ring on the sealing head and let the end of the clamping ring close to the pressure loading direction contact the end of the metal elastic ring away from the pressure loading direction, then install the sealing head on the cylinder so that the rubber sealing ring b is pressed against the inner wall of the cylinder, and then install the threaded compression ring on the end of the cylinder so that the threaded compression ring presses the metal elastic ring through the compression ring, and both sides of the metal elastic ring are in contact with the angle b for sealing.

Images