Sealing structure and high-pressure high-purity helium storage tank

Abstract

The utility model relates to the technical field of high-pressure storage tanks, in particular to a sealing structure and a high-pressure high-purity helium storage tank, and the sealing structure comprises two sealing grooves which are respectively arranged on a manhole flange and a manhole cover, and the positions of the two sealing grooves are correspondingly arranged; the metal ring gasket is arranged between the two sealing grooves; the two auxiliary sealing rings are arranged in the two sealing grooves respectively, each auxiliary sealing ring comprises two ring arms, and during sealing, the two ring arms are located between the metal ring gasket and the sealing grooves and extruded by the metal ring gasket. In the utility model, the metal ring gasket bears the strength of high-pressure helium in the storage tank, the auxiliary sealing ring is arranged between the metal ring gasket and the sealing groove, and the two ring arms of the auxiliary sealing ring are extruded by the metal ring gasket, so that a soft seal is added on the basis of the original hard seal, and the helium can be prevented from generating chronic leakage through a sealing surface; and economic loss caused by chronic leakage of helium stored in the high-pressure storage tank for a long time is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure storage tanks, in particular to a sealing structure and a high-pressure high-purity helium storage tank. Background Art

[0002] Helium is a rare inert gas with very little reserves on the earth and is expensive. The content of helium in the atmosphere is only about one in five hundred thousand, and it is not worth extracting from the atmosphere. Helium mainly exists in natural gas fields, but the helium content in the proven natural gas fields in China is small, and the production is far from meeting the usage requirements, so a large amount needs to be imported every year.

[0003] Helium has a wide range of uses and is mainly applied in fields such as scientific research, medical treatment, nuclear power, military, and aviation. In some usage occasions such as scientific research and nuclear power, high-pressure helium is required, so helium needs to be pressurized and stored in a high-pressure helium storage tank.

[0004] In order to ensure the strength, the manhole seal of the existing high-pressure helium storage tank can only adopt a metal ring gasket sealing structure. The sealing part is in contact with metal to metal, and the metal ring gasket is pressed in the sealing groove by fastening bolts to play a sealing role. This sealing structure belongs to hard sealing. Helium is a strongly permeable gas. For example, the helium leak detection method uses the strong permeation characteristics of helium to detect equipment with high sealing requirements. Helium is a monoatomic gas with a very small atomic diameter, and it is very easy to continuously leak out from between the pressed metal contact surfaces, resulting in chronic leakage. In a high-pressure helium storage tank, due to the high pressure of helium, the amount of chronic leakage is considerable, and the helium stored in the high-pressure storage tank for a long time will continuously leak out, causing economic losses.

[0005] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present utility model, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those skilled in the art. Summary of the Utility Model

[0006] The utility model provides a sealing structure and a high-pressure high-purity helium storage tank, thereby effectively solving the problems in the background art.

[0007] In order to achieve the above object, the technical solution adopted by the utility model is: a sealing structure, comprising:

[0008] Two sealing grooves, the two sealing grooves are respectively arranged on the manhole flange and the manhole cover, and the positions of the two sealing grooves are correspondingly arranged;

[0009] A metal ring gasket, the metal ring gasket is arranged between the two sealing grooves;

[0010] Two auxiliary sealing rings, the two auxiliary sealing rings are respectively arranged in the two sealing grooves, the auxiliary sealing ring includes two ring arms, when sealed, the two ring arms are located between the metal ring gasket and the sealing groove, and are extruded by the metal ring gasket.

[0011] Further, one end of the two ring arms close to the metal ring gasket forms an arc surface.

[0012] Further, both ends of the metal ring gasket are correspondingly arranged in an arc shape with respect to the two ring arms.

[0013] Further, one end of the two ring arms far from the metal ring gasket forms a trapezoidal surface, and is smaller at the end far from the metal ring gasket than at the end close to the metal ring gasket.

[0014] Further, a protrusion is arranged at one end of the auxiliary sealing ring far from the metal ring gasket, the shape of the sealing groove corresponds to the end in contact with the auxiliary sealing ring, and the sealing groove and the auxiliary sealing ring are mutually attached.

[0015] Further, the cross-sectional shape of the protrusion includes any one of a rectangle, a trapezoid, and an arc.

[0016] The present invention further includes a high-pressure high-purity helium storage tank, including:

[0017] A cylinder body, the cylinder body includes a storage cavity for storing helium, and an air inlet and an air outlet are arranged on the cylinder body;

[0018] A spherical head, the spherical head is arranged at one end of the cylinder body in the length direction;

[0019] A manhole flange and a manhole cover, the manhole flange and the manhole cover are arranged at the other end of the cylinder body in the length direction, and a sealing structure as described above is arranged between the manhole flange and the manhole cover.

[0020] Further, the inner wall material of the helium storage tank is set as stainless steel, and the outer wall material is set as carbon steel.

[0021] Further, a plurality of supports are arranged at the bottom of the cylinder body.

[0022] The beneficial effects of the present utility model are as follows: In the present utility model, the metal ring gasket bears the strength of the high-pressure helium gas in the storage tank. Since there is an auxiliary sealing ring between the metal ring gasket and the sealing groove, and the two ring arms of the auxiliary sealing ring are extruded by the metal ring gasket, a soft seal is added on the basis of the original hard seal, so as to prevent helium from slowly leaking through the sealing surface and avoid the economic loss caused by the slow leakage of helium stored in the high-pressure storage tank for a long time. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the sealing structure;

[0025] Figure 2 For Figure 1 Structural schematic diagram of the separation of the sealing structure in

[0026] Figure 3 Structural schematic diagram of the auxiliary sealing ring;

[0027] Figure 4 And Figure 5 Structural schematic diagrams of different forms of the auxiliary sealing ring;

[0028] Figure 6 Structural schematic diagram of the helium storage tank;

[0029] Figure 7 Structural schematic diagram of the manhole flange and the manhole cover. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] As shown in Figures 1 to 5 the following: A sealing structure includes:

[0034] Two sealing grooves 11 are respectively arranged on the manhole flange 41 and the manhole cover 42, and the positions of the two sealing grooves 11 are correspondingly arranged;

[0035] A metal ring gasket 12 is arranged between the two sealing grooves 11;

[0036] Two auxiliary sealing rings 13 are respectively arranged in the two sealing grooves 11. The auxiliary sealing ring 13 includes two ring arms 131. When sealed, the two ring arms 131 are located between the metal ring gasket 12 and the sealing groove 11 and are extruded by the metal ring gasket 12.

[0037] By arranging the sealing groove 11, the metal ring gasket 12 and the two auxiliary sealing rings 13, in the sealing structure 1, the metal ring gasket 12 is designed as the main sealing element and is arranged between the corresponding sealing grooves 11 of the manhole flange 41 and the manhole cover 42. The auxiliary sealing ring 13 is located in the sealing groove 11. When the manhole flange 41 and the manhole cover 42 are fixed by fastening bolts, the metal ring gasket 12 is pressed tightly. The metal ring gasket 12 bears the strength of the high-pressure helium gas in the storage tank. And because there is an auxiliary sealing ring 13 between the metal ring gasket 12 and the sealing groove 11, and the material of the two auxiliary sealing rings 13 is rubber, and its cross-sectional area is slightly larger than the size of the placement space at the bottom of the sealing groove. When the two ring arms 131 of the auxiliary sealing ring 13 are extruded by the metal ring gasket 12, they produce compression deformation to become a soft sealing structure. Therefore, an additional soft sealing is added on the basis of the original hard sealing, so as to prevent helium gas from leaking out through the sealing surface and avoid chronic leakage of helium gas stored in the high-pressure storage tank for a long time, resulting in economic losses.

[0038] In this embodiment, one end of the two ring arms 131 close to the metal ring gasket 12 forms an arc surface. Moreover, the two ends of the metal ring gasket 12 are correspondingly arranged as arcs with respect to the two ring arms 131.

[0039] The arc surface design enables the ring arms 131 to distribute pressure more evenly when being pressed, increasing the contact area, thereby further enhancing the sealing effect. The two ends of the metal ring gasket 12 are designed as arcs and are correspondingly arranged with the arc surface ring arms 131 of the auxiliary sealing ring 13, making the contact between the metal ring gasket 12 and the auxiliary sealing ring 13 closer, improving the sealing effect. The design of the arc-shaped metal ring gasket 12 and the arc surface ring arms 131 cooperate with each other, making the contact surface more uniform, further enhancing the sealing effect and preventing chronic leakage of helium gas.

[0040] Wherein, one end of the two ring arms 131 far from the metal ring gasket 12 forms a trapezoidal surface, and is smaller at the end far from the metal ring gasket 12 than at the end close to the metal ring gasket 12.

[0041] By forming a trapezoidal surface at the end of the two ring arms 131 away from the metal ring gasket 12, and making the end away from the metal ring gasket 12 smaller than the end close to the metal ring gasket 12, it is convenient to place the auxiliary sealing ring 13 into the sealing groove 11, and it is convenient for replacing and installing the auxiliary sealing ring 13, etc.

[0042] As an optimization of the above embodiment, a protrusion 132 is provided at the end of the auxiliary sealing ring 13 away from the metal ring gasket 12. The shape of the sealing groove 11 is correspondingly arranged at the end in contact with the auxiliary sealing ring 13, and the sealing groove 11 and the auxiliary sealing ring 13 are mutually fitted.

[0043] The protrusion 132 of the auxiliary sealing ring 13 is correspondingly arranged with the sealing groove 11, which can ensure a tighter fit, increase the contact area of the sealing surface, further enhance the sealing effect, prevent the chronic leakage of helium, enable the auxiliary sealing ring 13 to automatically align with the sealing groove 11 during the installation process, ensure the tight combination of the sealing ring and the groove, and improve the stability and reliability of the seal.

[0044] Among them, the cross-sectional shape of the protrusion 132 includes any one of a rectangle, a trapezoid, and an arc.

[0045] The rectangular cross-section has a simple structure and is easy to manufacture, can provide a large contact area, and enhance the sealing effect; the trapezoidal cross-section can better distribute the pressure, reduce stress concentration, can maintain a stable shape when compressed, and improve the sealing reliability; the arc cross-section can better adapt to the shapes of the metal ring gasket 12 and the sealing groove 11, provide uniform contact pressure, further reduce micro voids, and improve the sealing effect, and is particularly suitable for high-pressure environments.

[0046] As Figure 6 and Figure 7 shown, this embodiment also includes a high-pressure high-purity helium storage tank, including:

[0047] A cylinder body 2, the cylinder body 2 includes a storage cavity for storing helium, and an air inlet 21 and an air outlet 22 are provided on the cylinder body 2;

[0048] A spherical head 3, the spherical head 3 is arranged at one end of the cylinder body 2 in the length direction;

[0049] A manhole flange 41 and a manhole cover 42, the manhole flange 41 and the manhole cover 42 are arranged at the other end of the cylinder body 2 in the length direction, and a sealing structure 1 as described above is provided between the manhole flange 41 and the manhole cover 42.

[0050] Through the optimized sealing structure 1, the helium tightness under high-pressure environment is ensured, the leakage of helium is reduced, which can effectively meet the storage requirements of high-pressure and high-purity helium, reduce the helium leakage, improve the safety and reliability of the storage tank, and is applicable to fields such as scientific research, medical treatment, nuclear power, military and aviation that require high-purity helium.

[0051] In this embodiment, the inner wall material of the helium storage tank is set as stainless steel, and the outer wall material is set as carbon steel.

[0052] Some applications of helium have very high requirements for the purity of helium. Especially for nuclear power, high-purity helium must be used. Therefore, when manufacturing a helium storage tank, composite steel plates are used, with the inner wall being stainless steel and the outer wall being carbon steel. After manufacturing, the inner wall is then subjected to a cleaning treatment, so that the helium storage tank can provide excellent corrosion resistance and high-pressure resistance while ensuring the storage requirements of high-purity helium.

[0053] As a preference of the above embodiment, a plurality of supports 23 are provided at the bottom of the cylinder body 2. The plurality of supports 23 support the helium storage tank so that it can be placed on the working plane.

[0054] Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure, characterized in that: include: Two sealing grooves, the two sealing grooves are respectively arranged on the manhole flange and the manhole cover, and the two sealing grooves are arranged at corresponding positions; A metal ring gasket, the metal ring gasket is arranged between the two sealing grooves; Two auxiliary sealing rings are respectively arranged in the two sealing grooves, and the auxiliary sealing rings include two ring arms. When sealing, the two ring arms are located between the metal ring gasket and the sealing groove and are squeezed by the metal ring gasket.

2. The sealing structure according to claim 1, characterized in that: The two ring arms form an arc surface at one end close to the metal ring pad.

3. The sealing structure according to claim 2, characterized in that: The two ends of the metal ring gasket are arranged in arc shape corresponding to the two ring arms.

4. The sealing structure according to claim 2, characterized in that: The two ring arms form a trapezoidal surface at one end away from the metal ring pad, and the end away from the metal ring pad is smaller than the end close to the metal ring pad.

5. The sealing structure according to claim 1, characterized in that: The auxiliary sealing ring is provided with a protrusion at one end away from the metal ring gasket, and the sealing groove is provided corresponding to the end in contact with the auxiliary sealing ring, and the sealing groove and the auxiliary sealing ring are fitted with each other.

6. The sealing structure according to claim 5, characterized in that: The cross-sectional shape of the protrusion includes any one of a rectangle, a trapezoid, and an arc.

7. A high-pressure and high-purity helium storage tank, characterized in that: include: A cylinder, wherein the cylinder includes a storage chamber for storing helium, and the cylinder is provided with an air inlet and an air outlet; A spherical sealing head, which is arranged at one end of the cylinder in the length direction; A manhole flange and a manhole cover, wherein the manhole flange and the manhole cover are arranged at the other end of the cylinder in the length direction, and a sealing structure as described in any one of claims 1 to 6 is arranged between the manhole flange and the manhole cover.

8. The high-pressure and high-purity helium storage tank according to claim 7, characterized in that: The inner wall material of the helium storage tank is set to stainless steel, and the outer wall material is set to carbon steel.

9. The high-pressure and high-purity helium storage tank according to claim 7, characterized in that: A plurality of supports are arranged at the bottom of the cylinder.

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