Metal sealing ring and metal sealing structure

Abstract

The utility model provides a metal sealing ring, and belongs to the technical field of sealing. The metal sealing ring comprises an annular body which can be elastically deformed; the guide supporting part is of an annular structure, and the annular inner surface of the guide supporting part is connected with the annular outer surface of the annular body; one side of the annular sealing part is connected with the annular outer surface of the annular body, and the other side of the annular sealing part is of an arc-shaped protruding structure relative to the annular outer surface of the annular body; the guide supporting part is located in the middle of the outer ring surface of the annular body, and the annular sealing parts are arranged on the two sides of the guide supporting part respectively. The outer guide supporting part is used for balancing the deformation direction of the annular body and balancing the contact condition of the annular sealing parts on the two sides and a to-be-sealed piece, it is guaranteed that the deformation state of the annular body is in the designed dynamic deformation state, and it is guaranteed that the annular body deforms in the guide direction of the guide supporting part all the time.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing, and specifically relates to a metal sealing ring and a metal sealing structure. Background Art

[0002] With the continuous development of my country's petroleum, natural gas, and coal chemical industries, it is extremely important to maintain zero leakage and long-term safety for the connection of process pipeline flanges or valve bodies and bonnets of devices used for high-temperature and high-pressure alternating devices. However, the existing structures such as graphite spiral wound gaskets, octagonal metal rings, and pan-seal rings (PTFE+metal support rings) are used for the connection strength seals between pressure-bearing parts (flanges or valves). During use, the spiral wound gaskets and octagonal rings are deformed and compressed, and cannot make up for the original design compression, especially under alternating pressure. The pan-seal ring uses PTFE non-metallic seals and cannot be used in high-temperature conditions, resulting in seal leakage. The above three structures are difficult to meet alternating conditions, sealing, life, etc.

[0003] Under the condition of high temperature and high pressure alternation, metal spiral wound gaskets and metal octagonal ring structures are usually used between pressure-bearing parts. However, when the pressure exceeds 42Mpa and the temperature exceeds 538℃, local leakage of the product will occur. Utility Model Content

[0004] The purpose of the utility model is to provide a metal sealing ring and a metal sealing structure, the purpose of which is to overcome the sealing performance of the connection between pressure-bearing parts under the condition of high temperature and high pressure alternation, especially the reliable sealing of the connection between flanges on high temperature, high pressure, toxic and harmful gas pipelines or the shell connection between the valve body and the valve cover of the valve, so as to supplement the products that are urgently needed in the market and can adapt to the process conditions and have excellent sealing performance to prevent leakage under high temperature and high pressure alternating conditions.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A metal sealing ring, comprising:

[0007] For an annular body capable of elastic deformation;

[0008] A guide support portion, wherein the guide support portion is an annular structure, and an inner surface of the guide support portion is connected to an outer surface of the annular body;

[0009] An annular sealing portion, one side of which is connected to the outer surface of the annular body, and the other side of which is an arc-shaped convex structure relative to the outer surface of the annular body;

[0010] The guide support portion is located in the middle of the outer surface of the annular body, and the annular sealing portions are respectively arranged on both sides of the guide support portion.

[0011] The thickness of the annular body gradually decreases from the guide support portion to the annular sealing portion.

[0012] When the inner surface of the annular body is under pressure, the deformation amount of the middle part of the annular body is greater than that of the two sides of the annular body.

[0013] The arc-shaped protrusion structure of the annular sealing part is used for rolling contact connection with the sealed part. When the inner surface of the annular body is deformed under pressure, the arc-shaped protrusion structure of the annular sealing part rolls in contact with the contact surface of the sealed part.

[0014] The two side surfaces of the guide support portion are parallel;

[0015] The metal sealing ring also includes a guide groove for being arranged on the component to be sealed, and the guide support portion is slidably connected to the guide groove.

[0016] At least one of the annular body, the guide support portion, and the annular sealing portion is made of a material capable of elastic rebound.

[0017] The annular body, the guide support portion and the annular sealing portion are an integrated structure.

[0018] The metal sealing ring is specially gold-plated as a whole, and the thickness of the gold plating is 0.075 mm.

[0019] The annular sealing portion is an arc-shaped convex structure.

[0020] The top of the guide support portion has a chamfer.

[0021] Compared with the prior art, the utility model adopts a metal sealing ring composed of an annular body, a guide support portion and an annular sealing portion. By arranging the annular sealing portion on the outer surface of the annular body, when sealing, the annular sealing portion is connected to the part to be sealed in a rolling contact manner, and the inner surface of the annular body bears the pressure inside the part to be sealed. The pressure inside the part to be sealed makes the contact surface between the annular sealing portion and the part to be sealed tighter. When the pressure and temperature inside the part to be sealed increase, although the annular body is deformed as a whole, due to the arc-shaped convex structure design of the annular sealing part, as the annular body deforms differently, the arc-shaped convex structure of the annular sealing part is always in contact with the part to be sealed in a rolling contact manner, and as the pressure and temperature increase, the contact between the annular sealing part and the part to be sealed becomes tighter, and the sealing performance changes accordingly with the deformation of the annular body. When the temperature increases or the pressure increases, the sealing performance of the annular sealing part and the part to be sealed is greatly increased. In addition, the guide support part is used to balance the deformation direction of the annular body and balance the contact between the annular sealing parts on both sides and the part to be sealed, ensuring that the deformation state of the annular body is in the designed dynamic deformation state, ensuring that the annular body always deforms in the guide direction of the guide support part, and increasing the service life of the metal sealing ring.

[0022] The utility model also provides a metal sealing structure, including the above-mentioned metal sealing ring, a first part to be sealed and a second part to be sealed, the first part to be sealed is sealed and connected to the second part to be sealed through the metal sealing ring, and the annular sealing part of the metal sealing ring and the first part to be sealed and the second part to be sealed are respectively provided with prestress by the annular body.

[0023] Compared with the prior art, the beneficial effects of the metal sealing structure provided by the utility model are the same as the beneficial effects of the metal sealing ring described in the above technical solution, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of the metal sealing ring of the utility model;

[0025] Figure 2 This is a schematic diagram of the assembly of the metal sealing ring and the sealed component of the utility model;

[0026] Figure 3 It is a schematic diagram of the overall structure of the metal sealing structure of the utility model.

[0027] Figure numerals: 1. annular body; 2. annular sealing portion; 3. guide support portion; 4. first part to be sealed; 5. second part to be sealed; 6. first reserved space; 7. second reserved space; 8. guide groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Glossary:

[0030] The annular body is annular and can be a perfect circular ring, an elliptical ring, a square ring or other annular structures that match the seal. The inner surface of the annular body is the inner surface of the annular inner cavity, and the outer surface of the annular body is the outermost outer surface along the circumference of the annular body. The relationship between the outer surface and the inner surface is a large circular surface and a small circular surface inside the large circular surface.

[0031] The guide support portion includes at least one guide structure, which guides the deformation direction of the annular body when the annular body is deformed. Figure 2 The guide groove plus slider combination structure, Figure 2 The slide block is an annular slide block, and the guide groove is also an annular guide groove. In specific implementation, the slide block and the guide groove can also be columnar.

[0032] The annular sealing part is annular, and its shape matches the annular body. The annular sealing part mainly plays a sealing role to isolate the inside and outside of the sealed component.

[0033] The present invention will be further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0034] Please refer to Figure 1 and Figure 2 The metal sealing ring of the utility model comprises an annular body 1, a guide support portion 3 and an annular sealing portion 2.

[0035] The annular body 1 is a pressure-bearing body of the metal sealing ring, and the annular body 1 can be elastically deformed. In order to ensure that the guide support portion 3 and the annular sealing portion 2 provided thereon can function, the material of the annular body 1 needs to be made of a metal material that can be elastically deformed, for example, the material is a high-temperature resistant alloy or austenitic stainless steel. The thickness of the annular body 1 along the radial direction needs to be determined according to the pressure inside the seal. Its thickness must ensure that the annular body 1 can produce the required deformation when under pressure, and also ensure that the annular body 1 does not exceed the elastic limit of its own material when deformed under pressure.

[0036] The guide support part 3 is an annular structure, and the inner surface of the guide support part 3 is connected to the outer surface of the annular body 1. Figure 2As shown, in one embodiment, the metal sealing ring also includes a guide groove 8 for being set on the sealed part, the guide support part 3 is slidably connected with the guide groove 8, the two side surfaces of the guide support part 3 are parallel, and the two side surfaces of the guide support part 3 are slidably connected with the two side surfaces of the guide groove 8. After the inner surface of the ring of the annular body 1 is compressed, the annular body 1 is deformed. During the deformation, the guide support part 3 and the guide groove 8 are slidably matched to guide the annular body 1 to deform along the guide direction of the guide support part 3 and the guide groove 8. Since the guide support part 3 has a guiding function, its material has no requirements on whether it rebounds or not, and it can be subjected to a separate quenching and hardening treatment to increase its wear resistance. The top of the guide support part has a chamfer.

[0037] One side of the annular sealing portion 2 is connected to the outer surface of the annular body 1, and the other side of the annular sealing portion 2 is an arc-shaped convex structure relative to the outer surface of the annular body 1. The arc-shaped convex structure of the annular sealing portion 2 is used for rolling contact connection with the sealed member. When the inner surface of the annular body 1 is deformed under pressure, Figure 2 As shown, the arc-shaped protrusion of the annular sealing part 2 rolls in contact with the contact surface of the sealed part driven by the annular body 1. The annular sealing part 2 is an arc-shaped protrusion, an elliptical protrusion or a corresponding arc-shaped protrusion designed according to the contact surface of the sealed part.

[0038] When using the existing sealing ring, the pressure and temperature of the fluid inside the sealed part will change, and the existing sealing ring will expand and contract and deform under pressure. The existing sealing ring will have relative friction with the contact surface of the sealed part. Over time, the existing sealing ring and the sealed part will wear out, causing the sealed part to leak frequently.

[0039] Compared with the existing seals, the annular sealing part 2 is connected to the part to be sealed by rolling contact. When dealing with the fluid of different pressures and temperatures that are constantly changing inside the part to be sealed, the annular body 1 is compressed or deformed by temperature difference. After deformation, the annular sealing part 2 rotates back and forth with the deformation. The arc-shaped protrusion structure is connected to the part to be sealed by rolling contact, which greatly reduces the relative friction between the annular sealing part 2 and the part to be sealed, and is more durable when used. The annular sealing part 2 can also be made of a metal material that can be elastically deformed, for example, the material is a high-temperature resistant alloy or austenitic stainless steel. The interaction force between the annular sealing part 2 and the part to be sealed can also cause the annular sealing part 2 to deform. Without exceeding the elastic limit of the material of the annular sealing part 2 itself, the direct contact area between the deformed annular sealing part 2 and the part to be sealed increases, and its sealing performance is improved under this characteristic.

[0040] like Figure 2As shown, the guide support portion 3 is located in the middle of the outer surface of the annular body 1, and an annular sealing portion 2 is provided on both sides of the guide support portion 3. When the inner surface of the annular body 1 is compressed, the deformation amount of the middle part of the annular body 1 is greater than that of the two sides of the annular body 1. Under this setting, the annular sealing portions 2 on both sides are in close contact with the sealed member, and after the inner surface of the annular body 1 is compressed, the compression deformation amount of the middle part of the annular body 1 is the largest.

[0041] In one embodiment, the thickness of the annular body 1 gradually decreases from the guide support portion 3 to the annular sealing portion 2. In this structure, the cross section of the annular metal sealing ring composed of the annular body 1, the guide support portion 3 and the annular sealing portion 2 is similar to a herringbone structure, and adopts a herringbone mechanical stable structure form, has a unique position after installation, achieves stable characteristics, effectively maintains the accurate design position of the parts, and achieves precise sealing characteristics. The metal sealing ring adopts a herringbone structure, which is more convenient for on-site installation and assembly. It relies on the outer side of the sealing ring for positioning, and is not easy to be disassembled and assembled in disorder, which greatly improves the installation accuracy and achieves precise assembly. The metal sealing ring adopts a herringbone stable principle structural design. During installation, a metal sealing ring slightly larger than the inner diameter of the sealed part is selected. After successful installation, a corresponding prestress will be generated to supplement the compression amount, ensuring that the metal sealing ring works effectively for a long time, and always has a compressible specific pressure, thereby ensuring the external sealing, safety and stability of the valve.

[0042] In one embodiment, the annular body 1, the guide support part 3 and the annular sealing part 2 are an integrated structure. The three are made of the same material for easy production. Of course, the annular body 1, the guide support part 3 and the annular sealing part 2 can also be produced with different materials according to their own characteristics. At least one of the annular body 1, the guide support part 3 and the annular sealing part 2 is made of a material that can elastically rebound. Among them, the annular body 1 must be made of a material that can elastically rebound. In order to ensure the corrosion resistance of the annular sealing part 2 and increase the sealing performance, the metal sealing ring is specially gold-plated as a whole, and the thickness of the gold plating is 0.075mm. The surface finish of the annular sealing part 2 is maintained above 0.4μm. The body of the seal to be sealed is maintained above 0.4μm.

[0043] like Figure 2As shown, when installing the metal sealing ring, the outer diameter of the selected metal sealing ring needs to be slightly larger than the inner diameter of the sealed part. After successful installation, a certain prestress will be generated between the annular sealing part 2 and the sealed part. The prestress can increase the sealing performance of the metal sealing ring. Compared with similar surface contacts in the past, which are prone to slight deformation of parts, the metal sealing ring disclosed in the utility model is easier to achieve sealing performance, reduce the pre-tightening force of the bolts, and then reduce the number of bolts and the thickness of the flange connection, saving costs. The prestress enables the annular sealing part 2 to effectively produce pre-tightening deformation, thereby achieving self-sealing. Compared with previous metal sealing pads, metal spiral wound gaskets and the like, it is easier to achieve sealing under pressure alternation.

[0044] In summary, the utility model adopts a metal sealing ring composed of an annular body, a guide support portion and an annular sealing portion. The annular sealing portion is arranged on the outer surface of the annular body. When sealing, the annular sealing portion is connected to the part to be sealed in a rolling contact manner, and the inner surface of the annular body bears the pressure inside the part to be sealed. The pressure inside the part to be sealed makes the contact surface between the annular sealing portion and the part to be sealed tighter. When the pressure and temperature inside the part to be sealed increase, although the annular body is deformed as a whole, due to the arc-shaped convex structure design of the annular sealing part, as the annular body deforms differently, the arc-shaped convex structure of the annular sealing part is always in contact with the part to be sealed in a rolling contact manner, and as the pressure and temperature increase, the contact between the annular sealing part and the part to be sealed becomes tighter, and the sealing performance changes accordingly with the deformation of the annular body. When the temperature increases or the pressure increases, the sealing performance of the annular sealing part and the part to be sealed is greatly increased. In addition, the guide support part is used to balance the deformation direction of the annular body and balance the contact between the annular sealing parts on both sides and the part to be sealed, ensuring that the deformation state of the annular body is in the designed dynamic deformation state, ensuring that the annular body always deforms in the guide direction of the guide support part, and increasing the service life of the metal sealing ring.

[0045] The utility model also discloses a metal sealing structure, comprising the above-mentioned metal sealing ring, a first part to be sealed 4 and a second part to be sealed 5, wherein the first part to be sealed 4 is sealedly connected to the second part to be sealed 5 through the metal sealing ring, and the annular sealing portion 2 of the metal sealing ring is provided with prestress by the annular body between the first part to be sealed 4 and the second part to be sealed 5. The outer diameter of the adopted metal sealing ring needs to be slightly larger than the inner diameter of the part to be sealed, and after successful installation, the elasticity of the annular body provides a certain prestress between the annular sealing portion 2 and the first part to be sealed 4 and the second part to be sealed 5, respectively, and the prestress can increase the sealing performance of the metal sealing ring.

[0046] Figure 2In the figure, the guide support part 3 is located between the first part to be sealed 4 and the second part to be sealed 5, and the two sides of the guide support part 3 are slidingly connected with the first part to be sealed 4 and the second part to be sealed 5 respectively. A first reserved space 6 is provided between the first part to be sealed 4 and the outer surface of the annular body 1 between the guide support part 3 and the annular sealing part 2, so that the annular body 1 can be freely deformed. A second reserved space 7 is provided between the second part to be sealed 5 and the outer surface of the annular body 1 between the guide support part 3 and the annular sealing part 2, so that the annular body 1 can be freely deformed. Both the first reserved space 6 and the second reserved space 7 are annular structures.

[0047] Compared with the prior art, the beneficial effects of the metal sealing structure provided by the utility model are the same as the beneficial effects of the metal sealing ring described in the above technical solution, which will not be described in detail here.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0050] In the description of the present utility model, 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A metal sealing ring, characterized in that: include: For an annular body capable of elastic deformation; A guide support portion, wherein the guide support portion is an annular structure, and an inner surface of the guide support portion is connected to an outer surface of the annular body; An annular sealing portion, one side of which is connected to the outer surface of the annular body, and the other side of which is an arc-shaped convex structure relative to the outer surface of the annular body; The guide support portion is located in the middle of the outer surface of the annular body, and the annular sealing portions are respectively arranged on both sides of the guide support portion.

2. The metal sealing ring according to claim 1, characterized in that: The thickness of the annular body gradually decreases from the guide support portion to the annular sealing portion.

3. The metal sealing ring according to claim 1, characterized in that: When the inner surface of the annular body is under pressure, the deformation amount of the middle part of the annular body is greater than that of the two sides of the annular body.

4. The metal sealing ring according to claim 1, characterized in that: The arc-shaped protrusion structure of the annular sealing part is used for rolling contact connection with the sealed part. When the inner surface of the annular body is deformed under pressure, the arc-shaped protrusion structure of the annular sealing part rolls in contact with the contact surface of the sealed part.

5. The metal sealing ring according to claim 1, characterized in that: The two side surfaces of the guide support portion are parallel; The metal sealing ring also includes a guide groove for being arranged on the component to be sealed, and the guide support portion is slidably connected to the guide groove.

6. The metal sealing ring according to claim 1, characterized in that: At least one of the annular body, the guide support portion, and the annular sealing portion is made of a material capable of elastic rebound.

7. The metal sealing ring according to claim 1, characterized in that: The annular body, the guide support portion and the annular sealing portion are an integrated structure.

8. The metal sealing ring according to claim 7, characterized in that: The metal sealing ring is specially gold-plated as a whole, and the thickness of the gold plating is 0.075mm; The annular sealing portion is an arc-shaped convex structure; The top of the guide support portion has a chamfer.

9. A metal sealing structure, comprising the metal sealing ring according to any one of claims 1 to 8, a first part to be sealed and a second part to be sealed, the first part to be sealed being sealedly connected to the second part to be sealed through the metal sealing ring, and the annular sealing part of the metal sealing ring and the first part to be sealed and the second part to be sealed are respectively provided with prestress by the annular body.

10. The metal sealing structure according to claim 9, characterized in that: The guide support portion is located between the first member to be sealed and the second member to be sealed, and the two sides of the guide support portion are slidingly connected to the first member to be sealed and the second member to be sealed respectively, and a first reserved space is provided between the first member to be sealed between the guide support portion and the annular sealing portion and the outer surface of the annular body for providing the annular body with free deformation, and a second reserved space is provided between the second member to be sealed between the guide support portion and the annular sealing portion and the outer surface of the annular body for providing the annular body with free deformation, and both the first reserved space and the second reserved space are annular structures.

Images