Metal sealing ring structure containing series-stacked disc spring elastic system

Abstract

The present application relates to the technical field of engineering sealing, and in particular to a metal sealing ring structure containing a series-stacked disc spring elastic system. The metal sealing ring structure comprises a structural body, a series-stacked disc spring elastic system and a sealing body, wherein the structural body is provided with a first support portion, a second support portion and a connecting portion, a first clearance through hole being provided in the connecting portion, the first support portion and the second support portion being each connected to the connecting portion, a first support face being arranged on the first support portion, and a second support face being arranged below the second support portion; the series-stacked disc spring elastic system is arranged between the first support portion and the second support portion and configured to enable the first support portion and the second support portion to have a tendency to move away from each other; and the sealing body comprises a first sealing body and a second sealing body, wherein the first sealing body is located on the first support face, and the second sealing body is located on the second support face. The present application can provide stable and reliable sealing effects, and is applicable to all-metal sealing requirements of pipe flanges of DN65 or below, e.g., nuclear energy and hydrogen energy.

Description

A metal sealing ring structure including a disc spring elastic system Technical Field

[0001] The present application relates to the field of engineering sealing technology, and in particular to a metal sealing ring structure including a disc spring elastic system. Background Art

[0002] During the development of the neutron flux monitoring system for the International Thermonuclear Experimental Reactor (ITER), all-metal sealing rings were typically used to seal flanges on pipelines for hydrogen and its isotopes. Similar to C-rings, these rings consist of a tightly packed coil spring bent into a full circle, welded at both ends. This sealing ring structure is generally suitable for pipelines larger than DN65. For pipelines smaller than DN65, using C-rings requires reducing the spring's bending radius. This results in a significant difference in the pitch between the inner and outer arcs of the spring, significantly altering its mechanical properties and making it difficult to guarantee sealing performance. Furthermore, C-rings are expensive to manufacture. Therefore, there is an urgent need to design a new sealing structure that can accommodate pipelines smaller than DN65 while also reducing manufacturing costs. Summary of the Invention

[0003] In response to the problems faced in the background technology, this application provides a metal sealing ring structure including a disc spring elastic system. The elastic system is formed by combining multiple components. The elastic potential energy stored in the elastic system under pressure is converted into elastic force, so that the sealing body forms an effective seal with the upstream and downstream components, meeting the full metal sealing requirements of pipeline flanges below DN65.

[0004] This application is implemented through the following technical solutions:

[0005] A metal sealing ring structure including a disc spring elastic system, comprising:

[0006] A structure comprising a first supporting portion, a second supporting portion, and a connecting portion, wherein the connecting portion is provided with a first avoidance through-hole, the first supporting portion and the second supporting portion are respectively connected to the connecting portion and symmetrically located at both ends of an extension direction of the first avoidance through-hole, the first supporting portion is provided with a first supporting surface, and the second supporting portion is provided with a second supporting surface;

[0007] A disc spring mate elastic system, the disc spring mate elastic system comprising a first disc spring and a second disc spring, the first disc spring and the second disc spring being mate-coupled and sleeved outside the outer cylindrical surface of the connecting portion; the first supporting portion being in contact with the inner side of the first disc spring, the second supporting portion being in contact with the inner side of the second disc spring, the first disc spring and the second disc spring being located between the first supporting portion and the second supporting portion; when the distance between the first supporting portion and the second supporting portion in the extension direction of the first avoidance through-hole decreases, the first disc spring and the second disc spring simultaneously undergo equal elastic deformation so that the first supporting portion and the second supporting portion have a movement tendency to move away from each other;

[0008] The sealing body includes a first sealing body and a second sealing body. The first sealing body is located on the first supporting surface to contact the upstream component. The second sealing body is located below the second supporting surface to contact the downstream component.

[0009] In some optional embodiments, the sealing body is configured as a soft metal body.

[0010] In some optional embodiments, the hardness of the sealing body is 18 to 35 HV.

[0011] In some optional embodiments, the sealing body is configured as a silver body.

[0012] In some optional embodiments, the yield strength of the structure at 20° C. is 55 MPa to 220 MPa.

[0013] In some optional embodiments, the structural body and the sealing body are an integral structure, wherein the sealing body is configured as a silver-plated layer.

[0014] In some optional embodiments, the ratio of the inner cone height to thickness of the first disc spring and the second disc spring is configured to be 0.3 to 0.7.

[0015] In some optional embodiments, the ratio of the inner cone height to thickness of the first disc spring and the second disc spring is configured to be 0.4.

[0016] In some optional embodiments, the ratio of the outer diameter to the inner diameter of the first disc spring and the second disc spring is configured to be 1.25 to 1.77.

[0017] Compared with the prior art, this application has the following advantages and beneficial effects:

[0018] The present application provides a metal sealing ring structure including a disc spring matching elastic system. The setting of the structure can provide stable support for the entire sealing ring structure, so that when cooperating with the upstream component and the downstream component, the upstream component and the downstream component can respectively form contact pressure between the first supporting part and the second supporting part, and then the first sealing body on the first supporting part and the second sealing body under the second supporting part can form a sealed contact with the upstream component and the downstream component; when the sealing ring structure is compressed, the disc spring matching elastic system between the first supporting part and the second supporting part stores elastic potential energy so that the first supporting part and the second supporting part have a movement tendency away from each other, so that when the structure vibrates or the temperature changes so that the sealing body detaches from the upstream component / downstream component, the first supporting part and the second supporting part can generate continuous contact pressure with the upstream component and the downstream component under the action of the disc spring matching elastic system, that is, the first sealing body and the second sealing body can always be tightly connected with the upstream component and the downstream component, thereby achieving stable sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary 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 illustrate 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.

[0020] FIG1 is a schematic diagram of the structure of a metal sealing ring including a disc spring elastic system provided in an embodiment of the present application;

[0021] FIG2 is a schematic diagram of the structure of the structure provided in an embodiment of the present application;

[0022] FIG3 is a schematic diagram of the sealing structure provided in an embodiment of the present application.

[0023] Markings and corresponding component names in the accompanying drawings: 1-first disc spring, 2-second disc spring, 3-structure, 31-first supporting portion, 32-second supporting portion, 33-connecting portion, 4-sealing body, 41-first sealing body, 42-second sealing body. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of this application more clear, the present application is further described in detail below in conjunction with examples and drawings. The schematic implementation methods of this application and their descriptions are only used to explain this application and are not intended to limit this application.

[0025] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that these specific details are not necessarily required to practice the present application. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present application.

[0026] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present application. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification do not necessarily refer to the same embodiment or example. Furthermore, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] In the description of this application, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. 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. Therefore, they should not be understood as limiting the scope of protection of this application.

[0028] As shown in Figures 1 to 3, an embodiment of the present application provides a metal sealing ring structure including a disc spring elastic system, which includes a structural body 3, a disc spring elastic system and a sealing body 4.

[0029] The structure 3 comprises a first support portion 31, a second support portion 32, and a connecting portion 33. The first support portion 31 and the second support portion 32 are respectively connected to the connecting portion 33. In actual implementation, the first support portion 31, the second support portion 32, and the connecting portion 33 can be constructed as an integrally formed structure to ensure the structural strength of the structure 3. The connecting portion 33 is provided with a first bypass hole, which is a circular hole for the flow of materials. The first support portion 31 and the second support portion 32 are respectively located at opposite ends of the first bypass hole. The first support portion 31 is provided with a first supporting surface on the top, and the second support portion 32 is provided with a second supporting surface below.

[0030] The disc spring matching elastic system may include a first disc spring 1 and a second disc spring 2. The first disc spring 1 and the second disc spring 2 are matched and sleeved outside the outer cylindrical surface of the connecting portion 33; and the first supporting portion 31 is connected to the inner side of the first disc spring 1, and the second supporting portion 32 is connected to the inner side of the second disc spring 2. The first disc spring 1 and the second disc spring 2 are located between the first supporting portion 31 and the second supporting portion 32; when the distance between the first supporting portion 31 and the second supporting portion 32 in the extension direction of the first avoidance through hole is reduced, the first disc spring 1 and the second disc spring 2 simultaneously undergo equal elastic deformation to make the first supporting portion 31 and the second The supporting parts 32 have a tendency to move away from each other; wherein, the structure 3 can be a tubular component before processing. First, the first supporting part 31 is formed by stamping or spinning one end of the structure 3, and the other end of the structure 3 is inserted into the inner circle of the first disc spring 1 and the second disc spring 2. Then, the second supporting part 32 is formed by stamping or spinning at the other end of the structure 3, so that the inner side of the first disc spring 1 can form a close contact with the first supporting part 31, and the inner side of the second disc spring 2 can form a close contact with the second supporting part 32. In this way, the first disc spring 1 and the second disc spring 2 can respond sensitively to the force and deform.

[0031] The sealing body 4 includes a first sealing body 41 and a second sealing body 42 . The first sealing body 41 is located on the first supporting surface to contact the upstream component, and the second sealing body 42 is located below the second supporting surface to contact the downstream component.

[0032] During use, the upstream and downstream components are typically pipe fittings, which are connected via their respective flanges. A sealing ring structure is placed between the upstream and downstream components and connected via a first relief hole in the sealing ring structure. The flanges of the upstream and downstream components are fastened together by bolts. During the connection process, the two flanges squeeze the sealing ring structure, so that the first sealing body 41 and the second sealing body 42 on the sealing ring structure can closely contact the flange surfaces of the upstream and downstream components. At this time, the first relief hole is in a relatively sealed environment, and substances will not leak when flowing through the first relief hole. At the same time, the disc spring elastic system between the first support portion 31 and the second support portion 32 undergoes elastic deformation to store elastic potential energy. When the connection structure is subjected to vibration or temperature changes, the distance between the two flanges will vary slightly. At this time, the disc spring elastic system supports the first support portion 31 and the second support portion 32, so that the first sealing body 41 and the second sealing body 42 can always be in close contact with the two flange surfaces, thereby providing a continuous and stable sealing effect.

[0033] When the sealing ring structure is compressed, the elastic deformation of the disc spring juxtaposition elastic system is based on the change in the distance between the first support portion 31 and the second support portion 32, that is, the deformation of the structure 3. If the rigidity of the structure 3 is too large, the disc spring juxtaposition elastic system is not easily elastically deformed. Therefore, in some optional embodiments, the first support portion 31, the second support portion 32, and the connecting portion 33 in the structure 3 are all thin-walled structures. The connecting portion 33 and the first support portion 31 can be machined from a seamless tube, and the material of the second support portion 32 is reserved at the bottom of the connecting portion 33, and the juxtaposition of the first disc spring 1 and the second disc spring 2 is inserted. The second support portion 32 is then formed by stamping or spinning. Of course, the first support portion 31 can also be formed by stamping or spinning. Since the structure 3 is a thin-walled structure, when the sealing ring structure is compressed, the first disc spring 1 and the second disc spring 2 will become flat, the inner diameter will be reduced, and the connecting portion 33 will bulge toward the center. The disc spring juxtaposition elastic system can effectively store elastic potential energy. More specifically, the yield strength of the structure 3 at 20° C. is 55 MPa to 220 MPa. For example, the structure 3 may be made of austenitic stainless steel with a yield strength of 172 MPa, or copper with a lower yield strength for ease of manufacturing.

[0034] In the embodiment of the present application, alignment refers to a stacking method in which the outer edges of the first disc spring 1 and the second disc spring 2 are in contact. By stacking the first disc spring 1 and the second disc spring 2 to form an elastic system, the inner ring ridges of the first disc spring 1 and the second disc spring 2 can fully contact the first support portion 31 and the second support portion 32 in the circumferential direction, that is, the first disc spring 1 and the second disc spring 2 can provide the first support portion 31 and the second support portion 32 with a continuous and uniform elastic force in the circumferential direction, thereby ensuring that the first sealing body 41 and the second sealing body 42 are in full contact with the upstream component and the downstream component, thereby ensuring a good sealing effect.

[0035] When the disc spring elastic system is stacked and inserted into the connecting part 33 through the first disc spring 1 and the second disc spring 2, the connecting part 33 can make the first disc spring 1 and the second disc spring 2 coaxial; the connection configuration of the first support part 31 and the second support part 32 and the connecting part 33 can be configured as: the first support part 31 and the second support part 32 are respectively attached to the convex surfaces of the first disc spring 1 and the second disc spring 2, so that the first support part 31 and the second support part 32 can play an axial limiting role on the first disc spring 1 and the second disc spring 2.

[0036] Normally, the deformation load curve of a disc spring is non-linear. When the sealing ring structure is compressed, causing the disc spring's elastic system to undergo elastic deformation, the stored elastic potential energy changes unevenly. When the structure vibrates or the temperature changes, it may cause the seal to fail. In actual operation, we prefer the deformation load curve of the disc spring to be a straight line. Therefore, in some optional embodiments, the ratio of the inner cone height to thickness of the first disc spring 1 and the second disc spring 2 is configured to be 0.3 to 0.7. In this way, after the first disc spring 1 and the second disc spring 2 produce a certain amount of deformation, their load changes are relatively stable, which is conducive to ensuring a good sealing effect when the structure vibrates or the temperature changes. In actual implementation, the ratio of the inner cone height to thickness of the first disc spring 1 and the second disc spring 2 is configured to be 0.4. When the ratio of the inner cone height to thickness is 0.4, the deformation load curves of the first disc spring 1 and the second disc spring 2 are approximately a straight line. Furthermore, the ratio of the outer diameter to the inner diameter of the first disc spring 1 and the second disc spring 2 is configured to be 1.25~1.77. When the ratio of the inner cone height to the thickness of the first disc spring 1 and the second disc spring 2 is 0.4, the ratio of the outer diameter to the inner diameter of the first disc spring 1 and the second disc spring 2 is configured to be 1.25~1.77, which can ensure that the elastic potential energy per unit volume of material is sufficient and the first disc spring 1 and the second disc spring 2 are easy to process and manufacture.

[0037] In some optional embodiments, the sealing body 4 can be configured as a soft metal body. The soft metal body has good ductility and is easy to undergo plastic deformation, and can fill the small depressions on the upstream and downstream flange sealing surfaces, thereby achieving sealing. In specific implementations, the hardness of the sealing body 4 is configured to be 18 to 35 HV.

[0038] Furthermore, the sealing body 4 can be configured as a silver body. Silver material has good ductility and can fit tightly against the flange surface when compressed, thereby providing a good sealing effect for a long time. When the sealing body 4 is configured as a silver body, its hardness is configured to be 25HV.

[0039] The sealing body 4 can be provided on the structural body by encapsulating the structural body. That is, the first sealing body 41 and the second sealing body 42 are configured as a whole. The sealing body 4 encapsulates the structural body from the inner side of the connecting portion 33 (i.e., the first avoidance through-hole). In this way, when the first supporting portion 31 and the second supporting portion 32 press the sealing body 4, the upper and lower parts of the sealing body 4 can restrict each other's position, thereby preventing the sealing body 4 from moving.

[0040] In some optional embodiments, the sealing body 4 and the structural body 3 may be an integral structure, wherein the sealing body 4 is configured as a silver-plated layer, such as silver-plated stainless steel or silver-plated copper.

[0041] In summary, this application configures the structure 3 as austenitic stainless steel with a yield strength of 172 MPa, configures the sealing body 4 as a silver body with a hardness of 25HV, and adopts two disc springs with an inner cone height to thickness ratio of 0.4 and an outer diameter to inner diameter ratio of 1.25 to 1.77, so that the sealing ring as a whole can have a good sealing effect in the pipeline sealing environment below DN65, and can provide a stable and effective sealing effect when the structure vibrates or the temperature changes.

[0042] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of this application. It should be understood that the above description is only the specific implementation methods of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A metal sealing ring structure comprising a disc spring pair elastic system, characterized in that Comprising: A structure (3), the structure (3) having a first supporting portion (31), a second supporting portion (32) and a connecting portion (33), a first avoiding through-hole being provided on the connecting portion (33), the first supporting portion (31) and the second supporting portion (32) being respectively connected to the connecting portion (33) and symmetrically located at both ends in the extending direction of the first avoiding through-hole, a first supporting surface being configured on the first supporting portion (31), and a second supporting surface being configured under the second supporting portion (32); A disc spring pair elastic system, the disc spring pair elastic system including a first disc spring (1) and a second disc spring (2), the first disc spring (1) and the second disc spring (2) being sleeved outside the outer cylindrical surface of the connecting portion (33) after being opposed; and, the first supporting portion (31) being connected to the inner side of the first disc spring (1), the second supporting portion (32) being connected to the inner side of the second disc spring (2), the first disc spring (1) and the second disc spring (2) being located between the first supporting portion (31) and the second supporting portion (32); when the distance between the first supporting portion (31) and the second supporting portion (32) decreases in the extending direction of the first avoiding through-hole, the first disc spring (1) and the second disc spring (2) simultaneously undergo equal elastic deformation so that the first supporting portion (31) and the second supporting portion (32) have a tendency to move away from each other; A sealing body (4), the sealing body (4) including a first sealing body (41) and a second sealing body (42), the first sealing body (41) being located on the first supporting surface to contact an upstream component, and the second sealing body (42) being located under the second supporting surface to contact a downstream component.

2. The metal seal ring structure comprising a conjoined disc spring elastic system according to claim 1, characterized in that, The sealing body (4) is configured as a soft metal body.

3. The metal seal ring structure comprising a convolute elastic system of disc springs according to claim 2, characterized in that, The hardness of the sealing body (4) is 18 - 35 HV.

4. The metal seal ring structure comprising a disc spring pair elastic system according to claim 3, characterized in that, The sealing body (4) is configured as a silver body.

5. The metal sealing ring structure comprising a conical spring pair elastic system according to claim 1, characterized in that, The yield strength of the structure (3) at 20 °C is 55 MPa - 220 MPa.

6. The metal sealing ring structure comprising a convoluted disc spring elastic system according to claim 1, characterized in that, The structure (3) and the sealing body (4) are of an integral structure, wherein the sealing body (4) is configured as a silver-plated layer.

7. The metal seal ring structure comprising a conjoined disc spring elastic system according to claim 1, characterized in that, The ratio of the inner cone height to the thickness of the first disc spring (1) and the second disc spring (2) is configured to be 0.3 - 0.

7.

8. The metal sealing ring structure comprising a conical spring pair elastic system according to claim 7, characterized in that, The ratio of the inner cone height to the thickness of the first disc spring (1) and the second disc spring (2) is configured to be 0.

4.

9. The metal sealing ring structure comprising a conjoined disc spring elastic system according to claim 1, wherein The ratio of the outer diameter to the inner diameter of the first disc spring (1) and the second disc spring (2) is configured to be 1.25 - 1.77.

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