Waveform sealing ring based on hydrogen environment

Abstract

The utility model discloses a wave-shaped sealing ring based on hydrogen environment, which comprises an upper sealing ring, a wave-shaped sealing ring and a lower sealing ring which are overlapped from top to bottom for use, a convex ring A is arranged on the upper sealing ring, a wave-shaped convex ring is arranged on the wave-shaped sealing ring, and a convex ring B is arranged on the lower sealing ring. The hydrogen sealing ring is used for solving the problem that hydrogen sealing performance is reduced due to micro cracks generated by stress concentration, thermal expansion and other factors when an existing metal sealing ring works at high temperature and high pressure, the three sealing rings which are used in an overlapped mode and are detachable are adopted, the elastic protruding ring is introduced to each sealing ring so as to provide a certain deformation and buffering effect, and therefore the sealing performance of hydrogen is improved. The stress concentration and fatigue influence are reduced, the generation probability of microcracks is reduced, the better sealing effect is achieved, and the service life of the sealing ring is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing rings, in particular to a corrugated sealing ring in a hydrogen environment. Background Art

[0002] Metal sealing ring is one of the important modern sealing structures. It is widely used in chemical, pharmaceutical, petroleum, extremely low temperature and high pressure and high temperature industries, playing the role of anti-leakage and anti-corrosion. Mechanical sealing device is a shaft sealing device that relies on one or more pairs of end faces perpendicular to the shaft and sliding relative to each other to maintain contact and assist in sealing under the action of fluid pressure and the elastic force of the compensation mechanism to achieve leakage prevention.

[0003] Hydrogen has extremely strong permeability and can pass through the tiny pores and defects of metal structures, causing leakage. Metal sealing rings work under high temperature and high pressure, which may cause micro cracks due to factors such as stress concentration and thermal expansion. These micro cracks will expand with the in and out of hydrogen, eventually leading to leakage and rupture.

[0004] Solving the problem of fine cracks and fatigue caused by metal sealing rings when sealing hydrogen requires comprehensive consideration of factors such as material selection, process design and use conditions. By optimizing the geometry, size and connection method of the sealing ring, the possibility of stress concentration and fatigue damage can be reduced. Therefore, designing a sealing structure that reduces stress and fatigue and is suitable for hydrogen has become a technical problem that needs to be solved urgently in the relevant technical field. Utility Model Content

[0005] The purpose of the utility model is to provide a corrugated sealing ring based on a hydrogen environment, introducing an elastic convex ring to provide a certain deformation and buffering effect, reduce the stress concentration and fatigue effects, reduce the probability of fine cracks, and extend its service life.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A corrugated sealing ring for use in a hydrogen environment comprises an upper sealing ring, a corrugated sealing ring and a lower sealing ring which are stacked from top to bottom, wherein a convex ring A is arranged on the upper sealing ring, a corrugated convex ring is arranged on the corrugated sealing ring, and a convex ring B is arranged on the lower sealing ring.

[0008] Further, the convex ring A includes a first annular convex ring, a second annular convex ring, and a wave crest convex ring A located between the first annular convex ring and the second annular convex ring, and the wave crest convex ring A protrudes from the first annular convex ring and the second annular convex ring.

[0009] Furthermore, the ratio of the width of the first annular convex ring and the second annular convex ring to the ring width of the upper sealing ring is 1:0.2-0.4.

[0010] Furthermore, the wave-shaped convex ring includes more than two wave crest convex rings B, a wave valley is formed between two adjacent wave crest convex rings B, and the cross-section of the wave crest or wave valley of the wave crest convex ring B along the radial direction is U-shaped or V-shaped.

[0011] Furthermore, the ratio of the wave crest height of the wave crest convex ring B to the ring width of the wave sealing ring is 1:0.2-0.4.

[0012] Furthermore, a secondary convex ring is provided in each wave valley, and the cross section of the wave crest of the secondary convex ring (213) along the radial direction is U-shaped or V-shaped, and the wave crest height of the secondary convex ring is less than the wave crest height of the wave crest convex ring B.

[0013] Furthermore, the convex ring B includes two wave crest convex rings C, and the ratio of the wave crest height of the wave crest convex ring B to the ring width of the lower sealing ring is 1:0.2-0.4.

[0014] Furthermore, the upper sealing ring, the corrugated sealing ring and the lower sealing ring are made of 304 stainless steel or 316 stainless steel.

[0015] Furthermore, the upper sealing ring, the corrugated sealing ring and the lower sealing ring are all plated with an alloy layer, and the alloy layer is a nickel alloy layer of Inconel 625 or Inconel 718.

[0016] Furthermore, the thickness of the alloy layers of the upper sealing ring, the corrugated sealing ring and the lower sealing ring is respectively 0.08 to 0.25 times of the ring width of the corresponding sealing ring.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model adopts three sealing rings which are superimposed and detachable, and introduces an elastic convex ring on each sealing ring. On the one hand, it provides a certain deformation and buffering effect, which is beneficial to reduce the stress on the sealing ring, realizes the effect of stress dispersion and fatigue reduction, and thus improves the service life of the sealing ring. On the other hand, it can better adapt to the uneven surface between the sealing ring and the sealed object, form a certain sliding on the contact surface, reduce friction and wear, and achieve a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the connection of the sealing rings of the utility model.

[0020] Figure 2 It is a structural cross-sectional view of the upper sealing ring.

[0021] Figure 3 It is a structural cross-sectional view of a first embodiment of a corrugated sealing ring.

[0022] Figure 4 It is a structural cross-sectional view of a second embodiment of a corrugated sealing ring.

[0023] Figure 5 3 is a cross-sectional view of the structure of the lower sealing ring.

[0024] The names corresponding to the reference numerals are:

[0025] 1-upper sealing ring, 2-wave-shaped sealing ring, 3-lower sealing ring, 11-first annular convex ring, 112-second annular convex ring, 13-peak convex ring A, 21-peak convex ring B, 22-trough, 23-secondary convex ring, 31-peak convex ring C. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore they cannot be understood as limitations on the present utility model. In addition, the terms "first", "second", "A", "B", "C", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] like Figure 1 As shown, the utility model provides a corrugated sealing ring for use in a hydrogen environment, comprising an upper sealing ring 1, a corrugated sealing ring 2 and a lower sealing ring 3 which are stacked from top to bottom, wherein a convex ring A is provided on the upper sealing ring 1, a corrugated convex ring is provided on the corrugated sealing ring 2, and a convex ring B is provided on the lower sealing ring 3. The utility model adopts three sealing rings which are stacked and detachable, and introduces an elastic convex ring on each sealing ring, which, on the one hand, provides a certain deformation and buffering effect, is conducive to reducing the stress on the sealing ring, realizes the effect of stress dispersion and fatigue reduction, and thus improves the service life of the sealing ring; on the other hand, it can better adapt to the uneven surface between the sealing ring and the sealed object, forms a certain sliding on the contact surface, reduces friction and wear, and achieves a better sealing effect.

[0029] In some embodiments, Figure 2As shown, the convex ring A includes a first annular convex ring 11, a second annular convex ring 12, and a peak convex ring A13 located between the first annular convex ring 11 and the second annular convex ring 12, and the peak convex ring A13 protrudes from the first annular convex ring 11 and the second annular convex ring 12. The first annular convex ring 11 and the second annular convex ring 12 are located at the upper part and the lower part respectively, and the peak convex ring A13 is located between the first annular convex ring 11 and the second annular convex ring 12. The first annular convex ring 11 and the second annular convex ring 12 are used to expand the sealing surface so that it can better contact with the sealed object. The cross-section of the peak convex ring A13 is a convex peak shape, and the peak convex ring 113 protrudes from the first annular convex ring 11 and the second annular convex ring 12. Compared with the traditional rigid seal, the first annular convex ring 11 and the second annular convex ring 12 are contacted and squeezed by the sealed object to promote the elastic deformation of the peak convex ring A13, thereby reducing the sealing pressure loss and improving the sealing performance. Preferably, the ratio of the width of the first annular convex ring 11 and the second annular convex ring 12 to the ring width of the upper sealing ring 1 is 1:0.2-0.4.

[0030] In some embodiments, the corrugated convex ring includes more than two crest convex rings B21, and a trough 22 is formed between two adjacent crest convex rings B21, and the cross section of the crest or trough 22 of the crest convex ring B21 along the radial direction is U-shaped or V-shaped. Compared with the traditional planar sealing structure, the corrugated sealing ring 2 with a corrugated convex ring has better elastic sealing, and the sealing contact can achieve extrusion deformation through the crest and trough, which plays a role of buffering and energy dissipation, effectively absorbs the energy brought by vibration and impact, reduces the impact on sealing, and improves the life and reliability of the seal. At the same time, it can also be used to relieve the stress caused by thermal expansion and reduce the risk of leakage. Preferably, the ratio of the crest height of the crest convex ring B21 to the ring width of the corrugated sealing ring 2 is 1:0.2~0.4. Preferably, a secondary convex ring 23 is provided in each trough 22, and the crest of the secondary convex ring 23 has a U-shaped or V-shaped cross section along the radial direction, and the crest height of the secondary convex ring 23 is less than the crest height of the crest convex ring B21. Since the wave crest convex ring B21 will be worn or consumed during long-term use, the convex ring 23 can play a replacement role in the later use process to extend its service life.

[0031] The two specific implementation structures of the corrugated sealing ring 2 are respectively as follows: Figure 3 and Figure 4 shown. Figure 3 In the embodiment, the cross section of the wave crest or wave trough 22 of the wave crest convex ring B21 of the wave convex ring along the radial direction is U-shaped, and the cross section of the wave crest of the secondary convex ring 23 along the radial direction is also U-shaped. Figure 4In the embodiment, the cross section of the crest or trough 22 of the crest convex ring B21 of the wave convex ring along the radial direction is V-shaped, and the cross section of the crest of the secondary convex ring 23 along the radial direction is also V-shaped. The crest or trough of the crest convex ring B21 and the crest cross section of the secondary convex ring 23 can be arbitrarily matched between U-shape and V-shape, and are not limited to the above two implementation structures.

[0032] In some embodiments, Figure 4 As shown, the convex ring B includes two wave crest convex rings C31, and the wave crest convex ring C can achieve extrusion deformation in sealing contact to enhance the sealing effect. Preferably, the ratio of the wave crest height of the wave crest convex ring B21 to the ring width of the lower sealing ring 3 is 1:0.2-0.4.

[0033] In some embodiments, the upper sealing ring 1, the corrugated sealing ring 2 and the lower sealing ring 3 are made of 304 stainless steel or 316 stainless steel. 304 stainless steel and 316 stainless steel have good corrosion resistance, can withstand high loads and wear, and can also be used in the food industry, expanding the scope of use.

[0034] In some embodiments, the upper sealing ring 1, the corrugated sealing ring 2 and the lower sealing ring 3 are all plated with an alloy layer, and the alloy layer is a nickel alloy layer of Inconel 625 or Inconel 718. Both Inconel 625 and Inconel 718 are high-temperature alloys with good corrosion resistance and high-temperature strength, which can improve service life and environmental tolerance. Preferably, the thickness of the alloy layer of the upper sealing ring 1, the corrugated sealing ring 2 and the lower sealing ring 3 is 0.08 to 0.25 times the ring width of the corresponding sealing ring.

[0035] In order to achieve effective sealing, it is also necessary to process the sealing surfaces of the upper sealing ring 1, the corrugated sealing ring 2 and the lower sealing ring 3. The sealing surfaces can be processed by grinding, polishing, coating with lubricating film, etc. to improve the fit between the sealing surfaces and reduce friction and wear.

[0036] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, rather than limiting it, and certainly not limiting the patent scope of the present invention; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; that is to say, any changes or embellishments made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention; in addition, the direct or indirect application of the technical solution of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A corrugated sealing ring in a hydrogen environment, characterized in that: The invention comprises an upper sealing ring (1), a corrugated sealing ring (2) and a lower sealing ring (3) which are stacked from top to bottom. The upper sealing ring (1) is provided with a convex ring A, the corrugated sealing ring (2) is provided with a corrugated convex ring, and the lower sealing ring (3) is provided with a convex ring B.

2. A corrugated sealing ring in a hydrogen environment according to claim 1, characterized in that: The convex ring A comprises a first annular convex ring (11), a second annular convex ring (12), and a wave crest convex ring A (13) located between the first annular convex ring (11) and the second annular convex ring (12), wherein the wave crest convex ring A (13) protrudes from the first annular convex ring (11) and the second annular convex ring (12).

3. The corrugated sealing ring in a hydrogen environment according to claim 2, characterized in that: The ratio of the width of the first annular convex ring (11) and the second annular convex ring (12) to the ring width of the upper sealing ring (1) is 1:0.2-0.

4.

4. The corrugated sealing ring in a hydrogen environment according to claim 1, characterized in that: The wave convex ring comprises more than two wave crest convex rings B (21), a wave valley (22) is formed between two adjacent wave crest convex rings B (21), and the cross section of the wave crest or wave valley (22) of the wave crest convex ring B (21) along the radial direction is U-shaped or V-shaped.

5. The corrugated sealing ring in a hydrogen environment according to claim 4, characterized in that: The ratio of the wave crest height of the wave crest convex ring B (21) to the ring width of the wave-shaped sealing ring (2) is 1:0.2-0.

4.

6. The corrugated sealing ring in a hydrogen environment according to claim 4, characterized in that: A secondary convex ring (23) is provided in each wave valley (22), the wave crest of the secondary convex ring (23) has a U-shaped or V-shaped cross section along the radial direction, and the wave crest height of the secondary convex ring (23) is less than the wave crest height of the wave crest convex ring B (21).

7. The corrugated sealing ring in a hydrogen environment according to claim 1, characterized in that: The convex ring B comprises two wave crest convex rings C (31), and the ratio of the wave crest height of the wave crest convex ring B (21) to the ring width of the lower sealing ring (3) is 1:0.2-0.

4.

8. The corrugated sealing ring in a hydrogen environment according to claim 1, characterized in that: The upper sealing ring (1), the corrugated sealing ring (2) and the lower sealing ring (3) are made of 304 stainless steel or 316 stainless steel.

9. The corrugated sealing ring in a hydrogen environment according to claim 1, characterized in that: The upper sealing ring (1), the corrugated sealing ring (2) and the lower sealing ring (3) are all plated with an alloy layer, and the alloy layer is a nickel alloy layer of Inconel 625 or Inconel 718.

10. The corrugated sealing ring in a hydrogen environment according to claim 9, characterized in that: The thickness of the alloy layers of the upper sealing ring (1), the corrugated sealing ring (2) and the lower sealing ring (3) is respectively 0.08 to 0.25 times the ring width of the corresponding sealing ring.

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