Sealing structure of valve for ultralow-temperature working condition

Abstract

The utility model discloses a sealing structure of a valve for an ultralow-temperature working condition, and relates to the technical field of sealing. The sealing structure of the valve for the ultralow-temperature working condition comprises an annular clamping sleeve, a sealing groove is formed in at least one end face of the clamping sleeve, a supporting ring and two elastic sealing rings are embedded in the sealing groove, and the two sealing rings are correspondingly attached to the inner walls of the two sides of the sealing groove correspondingly. The groove walls of the sealing grooves and the corresponding sealing rings form sealing modules, and the supporting ring is embedded between the two sealing modules and correspondingly abuts against the two first cavity walls. According to the sealing structure, when the jacket and the sealing ring of the sealing structure generate cold contraction under the ultralow-temperature working condition, namely, the sealing modules generate cold contraction, the supporting ring can make the two sealing modules continuously abut against the two first cavity walls by means of the thickness of the supporting ring, so that the groove wall of the sealing groove can still be attached to the first cavity walls, and the sealing effect is improved. And the sealing effect of the sealing structure on the valve under the ultralow-temperature working condition is ensured.

Description

Technical Field

[0001] The present application relates to the field of sealing technology, and in particular to a sealing structure of a valve for ultra-low temperature working conditions. Background Art

[0002] At present, for valves used in ultra-low temperature conditions, a universal seal is usually used to achieve its sealing. Universal seals, also known as spring energy storage seals, lip seals, etc., are high-performance seals with special springs installed in U-shaped jackets. When the universal seal is installed in the valve, its built-in energy storage spring is compressed, and the spring force causes the sealing lip of the jacket and the sealing surface on the inside of the valve to generate a certain contact stress to form a seal. As the system pressure increases, the system pressure causes the jacket to gradually expand, the sealing force increases, and a more effective seal can be formed between the jacket and the sealing surface.

[0003] However, under ultra-low temperature conditions (temperature < -162°C), the jacket and the spring inside it will shrink, resulting in the sealing lip being unable to fully fit the sealing surface, seriously affecting the sealing effect of the valve. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the present application provides a sealing structure for a valve for ultra-low temperature working conditions.

[0005] A sealing structure provided in this application adopts the following technical solution:

[0006] A sealing structure for a valve for ultra-low temperature working conditions, the valve comprising a valve body and a valve cover sleeved on the valve body, an annular valve cavity formed between the valve cover and the valve body, the valve cavity having two oppositely arranged first cavity walls, the two first cavity walls being arranged along the radial direction of the valve body, the sealing structure comprising an annular jacket embedded in the valve cavity, a sealing groove being provided on at least one end surface of the jacket, the outer walls on both sides of the sealing groove respectively correspondingly fitting with the two first cavity walls, a supporting ring and two elastic sealing rings being embedded in the sealing groove, the two sealing rings respectively correspondingly fitting with the inner walls on both sides of the sealing groove, the groove wall of the sealing groove and the corresponding sealing rings forming a sealing module, the supporting ring being embedded between the two sealing modules and pressing the two sealing modules respectively and correspondingly against the two first cavity walls.

[0007] By adopting the above technical solution, when the jacket and the sealing ring shrink under ultra-low temperature conditions, that is, when the sealing module shrinks, the support ring can continue to press the two sealing modules against the two first cavity walls by virtue of its own thickness, so that the groove wall of the sealing groove can still fit with the first cavity wall, thereby ensuring the sealing effect of the sealing structure on the valve under ultra-low temperature conditions.

[0008] In a specific implementation scheme, the jacket includes a sleeve body, and two annular sealing lips are provided on at least one end surface of the sleeve body. The two sealing lips are respectively located on both sides of the sealing groove, and the two sealing rings are respectively fitted with the inner walls of the two sealing lips.

[0009] By adopting the above technical solution, the annular sealing lip can better contact with the first cavity wall, effectively improving its sealing effect on the valve.

[0010] In a specific possible implementation manner, the axial cross-section of the sealing lip is arc-shaped and an interference fit is formed between the outer wall of the sealing lip and the first cavity wall, and the inner wall of the sealing lip matches the outer contour of the sealing ring.

[0011] By adopting the above technical solution, under ultra-low temperature conditions, when the shrinkage of the sealing lip is small and less than its interference, the sealing lip can still fit with the first cavity wall, effectively ensuring the sealing effect of the sealing lip on the valve.

[0012] In a specific possible implementation manner, the sealing structure further comprises a sealing protrusion provided on at least one radial side of the jacket, the sealing protrusion is annular and located between the sleeve body and the sealing lip, and the sealing protrusion is in contact with the first cavity wall.

[0013] By adopting the above technical solution, under ultra-low temperature conditions, when the shrinkage of the sealing lip is large and exceeds its interference fit, the sealing protrusion can continue to contact the first cavity wall after the sealing lip shrinks to maintain the seal on the valve, thereby ensuring the sealing effect of the sealing structure on the valve.

[0014] In a specific possible implementation manner, the axial cross-section of the sealing protrusion is triangular, and the top angle of the triangular cross-section conflicts with the first cavity wall to form an interference fit therebetween.

[0015] By adopting the above technical solution, the sealing protrusion can have a certain interference fit, further improving its sealing effect on the valve.

[0016] In a specific implementation manner, the triangular cross section has waist edges on both sides of the vertex angle, and an angle α is formed between the waist edge on one side of the triangular cross section close to the sealing lip and the first cavity wall, and the range of α is 25° to 35°.

[0017] By adopting the above technical solution, the smaller angle enables the waist edge of the triangular cross-section close to the sealing lip to fit as closely as possible to the first cavity wall, thereby increasing the contact area between the sealing protrusion and the first cavity wall and effectively improving the sealing effect on the valve.

[0018] In a specific implementation manner, an angle β is formed between a waist edge of the triangular cross section away from the sealing lip and the first cavity wall, and the range of β is 30°-40°.

[0019] By adopting the above technical solution, a larger angle can increase the space between the sleeve and the first cavity wall, increase the pressure in the space and squeeze the sealing protrusion, so that the waist edge of the triangular cross-section close to the sealing lip is further fitted to the first cavity wall, further improving its sealing effect on the valve.

[0020] In a specific feasible implementation scheme, the sealing groove includes a first sealing groove opened at the end of the sleeve body and a second sealing groove formed between the two sealing lips, the first sealing groove and the second sealing groove are connected to each other, the support ring includes a first ring body embedded in the first sealing groove and a second ring body arranged in the second sealing groove, the radial width of the first ring body is greater than the radial width of the second ring body, and bearing grooves are respectively formed between the support ring and the two sealing lips, and the two sealing rings are respectively accommodated in the two bearing grooves.

[0021] By adopting the above technical solution, the sealing ring can be accommodated in the bearing groove, and the sealing lip, the first ring body and the second ring body can all resist the sealing ring, which can prevent the sealing ring from falling off during the sealing process, thereby improving the sealing effect of the sealing structure on the valve.

[0022] In a specific possible implementation scheme, the valve cavity further has two oppositely disposed second cavity walls, and the two second cavity walls are arranged along the axial direction of the valve body. The sealing structure also includes a front stop ring provided at at least one end of the jacket, and one axial end of the front stop ring is pressed against the two sealing rings, and the other axial end of the front stop ring is in conflict with the second cavity wall.

[0023] By adopting the above technical solution, the second cavity wall can resist the front baffle ring, so that the front baffle ring applies pressure to the sealing ring along the axial direction of the jacket. The pressurized sealing ring can expand outward along the radial direction of the jacket and further squeeze the sealing lip, effectively increasing the sealing stress of the sealing lip on the first cavity wall and improving the sealing effect of the sealing lip on the valve.

[0024] In a specific possible implementation mode, the front stop ring includes a ring body and two front stop protrusions provided on one end surface of the ring body. The two front stop protrusions are annular and respectively press against the two sealing rings.

[0025] By adopting the above technical solution, the two front block protrusions can respectively press against the two sealing rings, thereby improving the squeezing effect of the front block ring on the sealing ring.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] The sealing structure of the present application, when its jacket and sealing ring shrink under ultra-low temperature conditions, that is, when the sealing module shrinks, the support ring can continue to press the two sealing modules against the two first cavity walls by virtue of its own thickness, so that the groove wall of the sealing groove can still fit with the first cavity wall, thereby ensuring the sealing effect of the sealing structure on the valve under ultra-low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the installation structure of the sealing structure and the valve of the embodiment of the present application.

[0029] Figure 2 yes Figure 1 A partial schematic diagram of .

[0030] Figure 3 yes Figure 2 Enlarged schematic diagram at point A in the middle.

[0031] Description of reference numerals:

[0032] 1. Jacket; 11. Jacket body; 12. Sealing lip; 2. Sealing groove; 21. First sealing groove; 22. Second sealing groove; 3. Support ring; 31. First ring body; 32. Second ring body; 33. Bearing groove; 4. Sealing ring; 5. Sealing protrusion; 6. Front stop ring; 61. Ring body; 62. Front stop protrusion;

[0033] 100, valve body; 101, valve cover; 102, valve cavity; 1021, first cavity wall; 1022, second cavity wall. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings.

[0035] See also Figure 1-3 , which shows a sealing structure of a valve for ultra-low temperature working conditions. The valve includes a valve body 100, a valve cover 101 sleeved on the valve body 100, an annular valve cavity 102 is formed between the valve cover 101 and the valve body 100, and the valve cavity 102 has two first cavity walls 1021 arranged opposite to each other, and the two first cavity walls 1021 are arranged along the radial direction of the valve body 100.

[0036] The sealing structure includes an annular jacket 1 embedded in the valve cavity 102, and the jacket 1 is coaxially arranged with the valve body 100. Sealing grooves 2 are respectively provided on the two axial end faces of the jacket 1, and the outer walls of the two sides of the sealing groove 2 are respectively corresponding to the two first cavity walls 1021. A support ring 3 and two elastic sealing rings 4 are embedded in each sealing groove 2, and the support ring 3 and the sealing ring 4 are coaxially arranged with the valve body 100. The two sealing rings 4 are respectively corresponding to the inner walls of the two sides of the sealing groove 2. The groove wall of the sealing groove 2 and the corresponding sealing ring 4 form a sealing module, and the support ring 3 is embedded between the two sealing modules and presses the two sealing modules against the two first cavity walls 1021 respectively. Among them, the sealing ring 4 is an annular energy storage spring.

[0037] Through the above-mentioned arrangement, when the jacket 1 and the sealing ring 4 shrink under ultra-low temperature conditions, that is, when the sealing module shrinks, the support ring 3 can continue to press the two sealing modules against the two first cavity walls 1021 by virtue of its own thickness, so that the groove wall of the sealing groove 2 can still fit with the first cavity wall 1021, thereby ensuring the sealing effect of the sealing structure on the valve under ultra-low temperature conditions; at the same time, through the arrangement of the two sealing grooves 2, the support rings 3 and the sealing modules in the two sealing grooves 2 can respectively seal the two axial ends of the valve cavity 102, thereby further improving the sealing effect.

[0038] In this embodiment, combined with Figure 2 As shown, the jacket 1 includes a sleeve body 11, and each axial end face of the sleeve body 11 is respectively provided with two annular sealing lips 12, the two sealing lips 12 are concentrically arranged and respectively located on both sides of the sealing groove 2, and the two sealing rings 4 are respectively fitted with the inner walls of the two sealing lips 12; wherein, the axial cross-section of the sealing lip 12 is arc-shaped and an interference fit is formed between its outer wall and the first cavity wall 1021, and the inner wall of the sealing lip 12 matches the outer contour of the sealing ring 4.

[0039] The annular sealing lip 12 can better contact with the first cavity wall 1021, effectively improving its sealing effect on the valve; at the same time, under ultra-low temperature conditions, when the cold shrinkage of the sealing lip 12 is small and less than its interference fit, the sealing lip 12 can still fit with the first cavity wall 1021, effectively ensuring the sealing effect of the sealing lip 12 on the valve.

[0040] In this embodiment, if Figure 2-3 As shown, the sealing structure further includes sealing protrusions 5 respectively arranged on both sides of the jacket 1 in the radial direction, the sealing protrusions 5 are annular and located between the sleeve body 11 and the sealing lip 12, and the sealing protrusions 5 are in contact with the first cavity wall 1021. Under ultra-low temperature conditions, when the shrinkage of the sealing lip 12 is large and exceeds its interference, the sealing protrusions 5 can continue to be in contact with the first cavity wall 1021 after the sealing lip 12 shrinks, so as to maintain the sealing of the valve, thereby ensuring the sealing effect of the sealing structure on the valve.

[0041] Specifically, when the sealing structure is installed in the valve cavity 102 at room temperature, because there is an interference between the sealing structure and the valve cavity 102, the first cavity wall 1021 will squeeze the sealing lip 12, so that the sealing surface of the sealing lip 12 is deformed into a plane that fits the first cavity wall 1021, and the outer diameter of the sealing lip 12 is the same as the outer diameter of the valve cavity 102; when entering the ultra-low temperature working condition, the sealing structure will shrink due to the low temperature, so that the outer diameter of the sealing lip 12 is smaller than the outer diameter of the valve cavity 102. At this time, the sealing lip 12 cannot be completely fitted with the first cavity wall 1021, which may cause gas leakage. Based on this, the present application adds a sealing protrusion 5 to the jacket. Among them, under ultra-low temperature working conditions, the outer diameter shrinkage rates of the two sealing lips 12 are 0.5% and 0.4% respectively, and the outer diameter shrinkage rate of the portion between the sealing lip 12 and the sleeve body 11 is 0.2%. Therefore, the sealing protrusion 5 is set at the portion between the sealing lip 12 and the sleeve body 11, which can better avoid the problem of low temperature shrinkage.

[0042] Further, combined with Figure 3 As shown, the axial cross section of the sealing protrusion 5 is triangular, the vertex of the triangular cross section is in conflict with the first cavity wall 1021 and an interference fit is formed between the two; the two sides of the vertex of the triangular cross section have waist edges, and the waist edge of the triangular cross section close to the sealing lip 12 has an angle α with the first cavity wall 1021, and the range of α is 25°~35°; the waist edge of the triangular cross section away from the sealing lip 12 has an angle β with the first cavity wall 1021, and the range of β is 30°~40°. Among them, the interference of the sealing protrusion 5 is 0.4%, so that the sealing protrusion 5 will not be over-compressed at room temperature, and can provide excellent sealing performance under ultra-low temperature conditions.

[0043] Through the above-mentioned arrangement, the sealing protrusion 5 can have a certain interference fit, thereby further improving its sealing effect on the valve; at the same time, the smaller angle enables the waist edge of the triangular cross-section close to the sealing lip 12 to fit as closely as possible to the first cavity wall 1021, thereby improving the contact area between the sealing protrusion 5 and the first cavity wall 1021, and effectively improving its sealing effect on the valve; the larger angle can increase the space between the sleeve 11 and the first cavity wall 1021, thereby increasing the pressure in the space and squeezing the sealing protrusion 5, thereby making the waist edge of the triangular cross-section close to the sealing lip 12 further fit to the first cavity wall 1021, thereby further improving its sealing effect on the valve.

[0044] In this embodiment, the sealing groove 2 includes a first sealing groove 21 opened at the end of the sleeve 11 and a second sealing groove 22 formed between the two sealing lips 12. The first sealing groove 21 and the second sealing groove 22 are connected to each other. The support ring 3 includes a first ring body 31 embedded in the first sealing groove 21 and a second ring body 32 arranged in the second sealing groove 22. The radial width of the first ring body 31 is greater than the radial width of the second ring body 32. Bearing grooves 33 are respectively formed between the support ring 3 and the two sealing lips 12, and the two sealing rings 4 are respectively accommodated in the two bearing grooves 33.

[0045] In this way, the sealing ring 4 can be accommodated in the bearing groove 33, and the sealing lip 12, the first ring body 31 and the second ring body 32 can all resist the sealing ring 4, thereby preventing the sealing ring 4 from falling off during the sealing process, thereby improving the sealing effect of the sealing structure on the valve.

[0046] In this embodiment, if Figure 1-2 As shown, the valve cavity 102 also has two second cavity walls 1022 arranged opposite to each other, and the two second cavity walls 1022 are arranged along the axial direction of the valve body 100. The sealing structure also includes a front baffle ring 6 arranged at at least one end of the jacket 1, and the front baffle ring 6 includes a ring body 61 and two front baffle protrusions 62 arranged on one axial end face of the ring body 61. The two front baffle protrusions 62 are annular and respectively press against the two sealing rings 4. The other axial end face of the front baffle ring 6 conflicts with the second cavity wall 1022. The front baffle ring 6 is made of material No. 316 or some materials with a low expansion coefficient under low temperature conditions.

[0047] The second cavity wall 1022 can resist the front blocking ring 6, so that the front blocking ring 6 applies pressure to the sealing ring 4 along the axial direction of the jacket 1. The two front blocking protrusions 62 can respectively press the two sealing rings 4. The pressurized sealing rings 4 can expand outward along the radial direction of the jacket 1 and further squeeze the sealing lip 12, effectively increasing the sealing stress of the sealing lip 12 on the first cavity wall 1021, and improving the sealing effect of the sealing lip 12 on the valve.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing structure of a valve for ultra-low temperature working conditions, the valve comprising a valve body (100), a valve cover (101) sleeved on the valve body (100), an annular valve cavity (102) formed between the valve cover (101) and the valve body (100), the valve cavity (102) having two first cavity walls (1021) arranged opposite to each other, the two first cavity walls (1021) being arranged along the radial direction of the valve body (100), characterized in that: The sealing structure comprises an annular jacket (1) embedded in the valve cavity (102), a sealing groove (2) is provided on at least one end face of the jacket (1), the outer walls on both sides of the sealing groove (2) respectively correspond to and fit with the two first cavity walls (1021), a support ring (3) and two elastic sealing rings (4) are embedded in the sealing groove (2), the two sealing rings (4) respectively correspond to and fit with the inner walls on both sides of the sealing groove (2), the groove wall of the sealing groove (2) and the corresponding sealing rings (4) form a sealing module, the support ring (3) is embedded between the two sealing modules and presses the two sealing modules respectively and correspondingly against the two first cavity walls (1021).

2. The sealing structure of the valve for ultra-low temperature working conditions according to claim 1 is characterized in that: The jacket (1) comprises a jacket body (11), at least one end surface of which is provided with two annular sealing lips (12), the two sealing lips (12) being respectively located on two sides of the sealing groove (2), and the two sealing rings (4) respectively correspondingly fitting with the inner walls of the two sealing lips (12).

3. The sealing structure of the valve for ultra-low temperature working conditions according to claim 2 is characterized in that: The axial cross-section of the sealing lip (12) is arc-shaped and an interference fit is formed between its outer wall and the first cavity wall (1021); the inner wall of the sealing lip (12) matches the outer contour of the sealing ring (4).

4. The sealing structure of the valve for ultra-low temperature working conditions according to claim 2 or 3, characterized in that: The sealing structure further comprises a sealing protrusion (5) provided on at least one radial side of the jacket (1); the sealing protrusion (5) is annular and is located between the jacket body (11) and the sealing lip (12); the sealing protrusion (5) is in contact with the first cavity wall (1021).

5. The sealing structure of the valve for ultra-low temperature working conditions according to claim 4 is characterized in that: The axial cross-section of the sealing protrusion (5) is triangular, and the top angle of the triangular cross-section abuts against the first cavity wall (1021), forming an interference fit between the two.

6. The sealing structure of the valve for ultra-low temperature working conditions according to claim 5 is characterized in that: The triangular cross section has waist edges on both sides of the vertex angle, and an angle α is formed between the waist edge on one side of the triangular cross section close to the sealing lip (12) and the first cavity wall (1021), and the range of α is 25° to 35°.

7. The sealing structure of the valve for ultra-low temperature working conditions according to claim 6 is characterized in that: An included angle β is formed between a waist edge of the triangular cross section that is away from the sealing lip (12) and the first cavity wall (1021), and the range of β is 30° to 40°.

8. The sealing structure of the valve for ultra-low temperature working conditions according to claim 2 or 3, characterized in that: The sealing groove (2) comprises a first sealing groove (21) opened at the end of the sleeve (11) and a second sealing groove (22) formed between the two sealing lips (12); the first sealing groove (21) and the second sealing groove (22) are connected to each other; the support ring (3) comprises a first ring body (31) embedded in the first sealing groove (21) and a second ring body (32) arranged in the second sealing groove (22); the radial width of the first ring body (31) is greater than the radial width of the second ring body (32); bearing grooves (33) are respectively formed between the support ring (3) and the two sealing lips (12); the two sealing rings (4) are respectively accommodated in the two bearing grooves (33).

9. The sealing structure of the valve for ultra-low temperature working conditions according to claim 8, characterized in that: The valve cavity (102) further comprises two second cavity walls (1022) which are arranged opposite to each other, and the two second cavity walls (1022) are arranged along the axial direction of the valve body (100). The sealing structure further comprises a front retaining ring (6) which is arranged at least at one end of the jacket (1), and one axial end of the front retaining ring (6) is pressed against the two sealing rings (4), and the other axial end of the front retaining ring (6) is in contact with the second cavity wall (1022).

10. The sealing structure of the valve for ultra-low temperature working conditions according to claim 9, characterized in that: The front stop ring (6) comprises a ring body (61) and two front stop protrusions (62) arranged on one end surface of the ring body (61); the two front stop protrusions (62) are annular and respectively press against the two sealing rings (4).

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