Quick-opening blind plate sealing ring

Abstract

The utility model discloses a quick-opening blind plate sealing ring which comprises a body with a saddle-shaped section, a first warped foot, a second warped foot and a third warped foot, the first warped foot, the second warped foot and the third warped foot are connected to the outer wall face of the body, the first warped foot and the second warped foot are oppositely arranged on the lower side of the body to form a first pressed inner cavity, and the third warped foot is arranged on the upper side of the body to form a second pressed inner cavity. An opening of the second pressure-bearing inner cavity faces the high-pressure raw material gas side, and the first pressure-bearing inner cavity is communicated with the second pressure-bearing inner cavity through a flat pressing hole; the first pressed inner cavity and the second pressed inner cavity which are communicated with each other are formed in the upper side and the lower side of the body with the saddle-shaped section, so that the first warping foot and the third warping foot generate upward horizontal pressure and outward horizontal pressure respectively, the body is attached to the sealing face of the quick-opening blind plate more tightly, and the quick-opening blind plate can be quickly opened along with continuous increase of the pressure. The first pressed inner cavity floats upwards to a certain degree, the gap between the blind plate cover and the lock ring can be compensated, and the phenomenon that the blind plate loses efficacy in the using process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, and particularly relates to a quick-opening blind flange sealing ring. Background Art

[0002] The quick-opening blind flange structure is a mechanical device installed at the end of a pressure vessel or a pressure pipeline to achieve quick opening and closing, and is widely used in industrial fields such as oil and gas, chemical industry, aerospace, and electric power energy. Compared with the bolt flange structure, the quick-opening blind flange structure is faster in opening and closing the door cover and is suitable for industrial application occasions where the door cover needs to be frequently installed and disassembled.

[0003] Existing quick-opening blind flange sealing ring structures include O-shaped sealing rings, C-shaped sealing rings, saddle-shaped sealing rings, etc. Due to having a certain floating property, which is beneficial to the disassembly of the door cover, the saddle-shaped sealing ring is a relatively good choice; however, various defects in the design and manufacturing process and the use process often lead to the phenomenon of blind flange seal failure during use. For example, under high pressure, the saddle-shaped sealing ring is prone to extrusion, which will cause damage to the saddle-shaped sealing ring.

[0004] Therefore, in order to improve the sealing reliability of the quick-opening blind flange sealing ring, it is necessary to develop a sealing ring with high reliability. Summary of the Utility Model

[0005] To solve the phenomenon of seal failure during the use of the blind flange, the utility model provides a quick-opening blind flange sealing ring. By arranging a first pressure-receiving inner cavity and a second pressure-receiving inner cavity which are connected and communicated on the upper and lower sides of the body with a saddle-shaped cross-section, horizontal pressures are respectively generated upward and outward on the first upturned foot and the third upturned foot, so that the body fits more closely with the sealing surface of the quick-opening blind flange. As the pressure continuously increases, the first pressure-receiving inner cavity has a certain upward float, and the gap between the blind flange cover and the lock ring can also be compensated, avoiding the phenomenon of seal failure during the use of the blind flange.

[0006] To achieve the above technical purpose, the utility model is realized through the following technical solutions:

[0007] A quick-opening blind flange sealing ring includes a body with a saddle-shaped cross-section and a first upturned foot, a second upturned foot, and a third upturned foot connected to the outer wall surface of the body;

[0008] Wherein, the first upturned foot and the second upturned foot are oppositely arranged on the lower side of the body to form a first pressure-receiving inner cavity, the third upturned foot is arranged on the upper side of the body to form a second pressure-receiving inner cavity, the opening of the second pressure-receiving inner cavity faces the high-pressure raw gas side, and the first pressure-receiving inner cavity is communicated with the second pressure-receiving inner cavity through a flat pressure hole.

[0009] In this solution, when there is no medium pressure inside the pressure vessel, the first and third lifting feet are in close contact with the sealing surface of the blind flange cover to achieve initial sealing. The pre-tightening force is generated by the interference amount of the first and third lifting feet after the quick-opening blind flange is installed in place. When high-pressure raw material gas enters the pressure vessel, the raw material gas pressure acts on the walls of the first and second pressure-receiving cavities. The upward component force generated by the first pressure-receiving cavity makes the first and third lifting feet fit more closely with the sealing surface of the quick-opening blind flange, and it increases as the pressure inside the pressure vessel increases. At the same time, the second pressure-receiving cavity generates a horizontal pressure acting on the third lifting foot towards the outside, strengthening the fit of the third lifting foot with the sealing surface of the quick-opening blind flange. Under the linkage of the two, the sealing effect of the sealing ring is enhanced. When the pressure continues to increase, the first pressure-receiving cavity floats upward to a certain extent, and it can also compensate for the gap between the blind flange cover and the locking ring, further avoiding the problem of sealing failure during the use of the blind flange.

[0010] As a further technical solution of the quick-opening blind flange sealing ring, a first easily extruded part and a second easily extruded part are arranged at the same-side end of the body as the third lifting foot. The first easily extruded part and the second easily extruded part are connected in sequence to form a stepped shape. When the blind flange cover is closed, the flange on the blind flange cover that matches the stepped groove can be well embedded, effectively reducing the extrusion of the sealing ring.

[0011] As a further technical solution of the quick-opening blind flange sealing ring, the included angle between the first easily extruded part and the second easily extruded part is 120° - 150°, further reducing the extrusion of the sealing ring by obliquely matching the stepped groove and the flange.

[0012] As a further technical solution of the quick-opening blind flange sealing ring, a chamfer is arranged at the outer end of the bottom wall of the second easily extruded part, and the lower part of the second easily extruded part is in a chamfer shape, which can further reduce extrusion and optimize the stress distribution of the sealing ring.

[0013] As a further technical solution of the quick-opening blind flange sealing ring, a metal ring is bonded to the stepped groove at the second easily extruded part. The metal ring can better prevent the extrusion of the rubber material and improve the stress and deformation distribution in the local area.

[0014] As a further technical solution of the quick-opening blind flange sealing ring, the metal ring is a component made of stainless steel material, improving the reliability of the sealing ring.

[0015] As a further technical solution of the quick-opening blind flange sealing ring, the cross-sectional length and width of the metal ring are both larger than the cross-sectional length and width of the second easily extruded part, further reducing the extrusion of the rubber material.

[0016] As a further technical solution of the quick-opening blind flange sealing ring, the second pressure-receiving cavity is inclined, and the included angle α between the bottom wall surface of the second pressure-receiving cavity and the horizontal plane is between 0° and 20°, so that the second pressure-receiving cavity has sufficient pressure-receiving volume.

[0017] As a further technical solution of the quick-opening blind flange sealing ring, the distance L1 from the end of the first easily extruded part to the top of the third warping foot is less than the distance L2 from the end of the first easily extruded part to the center of the flat pressure hole, so as to avoid the flat pressure hole being blocked by the third warping foot due to excessive floating of the sealing ring.

[0018] As a further technical solution of the quick-opening blind flange sealing ring, a filter element is embedded in the flat pressure hole to prevent impurities from entering the first pressure-receiving cavity.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] 1. The utility model provides a quick-opening blind flange sealing ring. By arranging a first pressure-receiving cavity and a second pressure-receiving cavity which are connected and communicated on the upper and lower sides of the saddle-shaped cross-section body, the first warping foot and the third warping foot respectively generate upward and outward horizontal pressures, so that the body fits more closely with the sealing surface of the quick-opening blind flange. As the pressure continuously increases, the first pressure-receiving cavity floats upward to a certain extent, and the gap between the blind flange cover and the lock ring can also be compensated, avoiding the phenomenon of sealing failure during the use of the blind flange.

[0021] 2. The utility model is provided with a first easily extruded part and a second easily extruded part at the same side end of the body and the third warping foot, and the first easily extruded part and the second easily extruded part are connected in sequence to form a stepped shape. At the same time, a metal ring is bonded to the stepped groove at the second easily extruded part, and the metal ring can effectively prevent the rubber material from being extruded and improve the stress and deformation distribution in the local area. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the embodiments of the utility model, form a part of this application, and do not constitute a limitation to the embodiments of the utility model. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of the quick-opening blind flange sealing ring provided in Embodiment 1 of the utility model;

[0024] Figure 2 It is a schematic structural diagram of the quick-opening blind flange sealing ring provided in Embodiment 2 of the utility model;

[0025] Figure 3 It is a schematic installation state diagram of the utility model.

[0026] Marks in the drawings and corresponding component names:

[0027] 1 - Body, 2 - First upturned foot, 3 - Second upturned foot, 4 - First pressure - receiving inner cavity, 5 - Equalizing hole, 6 - Third upturned foot, 7 - Second pressure - receiving inner cavity, 8 - First easily extrudable part, 9 - Second easily extrudable part, 10 - Chamfer, 11 - Metal ring, 12 - Head, 13 - Sealing groove, 14 - Blind plate cover. Specific embodiments

[0028] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments of the present utility model and their descriptions are only used to explain the present utility model and shall not be construed as limiting the present utility model.

[0029] Embodiment 1

[0030] Embodiment 1 of the present invention provides a quick - opening blind - plate sealing ring, as Figure 1 shown, including a body 1 with a saddle - shaped cross - section and a first upturned foot 2, a second upturned foot 3 and a third upturned foot 6 connected to the outer wall surface of the body 1. The first upturned foot 2 and the second upturned foot 3 are oppositely arranged on the lower side of the body 1 to form a first pressure - receiving inner cavity 4. The third upturned foot 6 is inclinedly arranged on the upper side of the body 1 to form a second pressure - receiving inner cavity 7. The opening of the second pressure - receiving inner cavity 7 faces the high - pressure raw gas side, and the first pressure - receiving inner cavity 4 and the second pressure - receiving inner cavity 7 are communicated through an equalizing hole 5.

[0031] Among them, a first easily extrudable part 8 and a second easily extrudable part 9 are arranged at the same - side end of the body 1 as the third upturned foot 6. The first easily extrudable part 8 and the second easily extrudable part 6 are connected in sequence to form a stepped shape. When the blind plate cover 14 is closed, the flange on the blind plate cover 14 that matches the stepped groove can be well embedded, effectively reducing the extrusion of the sealing ring.

[0032] In some other embodiments, the included angle between the first easily extrudable part 8 and the second easily extrudable part 9 is 120° - 150°. By inclining to match the stepped groove and the flange, the extrusion of the sealing ring is further reduced. At the same time, a chamfer 10 is provided at the outer end of the bottom wall of the second easily extrudable part 9, making the lower part of the second easily extrudable part 9 chamfered, which can further reduce extrusion and optimize the stress distribution of the sealing ring.

[0033] In this embodiment, in order to better optimize the stress distribution of the sealing ring, the above - mentioned second pressure - receiving inner cavity 7 is inclinedly arranged, and the included angle α between the bottom wall surface of the second pressure - receiving inner cavity 7 and the horizontal plane is 20°, so that the second pressure - receiving inner cavity 7 has sufficient pressure - receiving volume.

[0034] In addition, in order to prevent the equalizing hole 5 from being possibly blocked by the third upturned foot 6, the distance L1 from the end of the first easily extrudable part 8 to the top of the third upturned foot 6 is less than the distance L2 from the end of the first easily extrudable part 8 to the center of the equalizing hole 5.

[0035] In some possible embodiments, to prevent impurities from entering the first pressure chamber 4, a filter element is also embedded in the equalizing hole 5.

[0036] Embodiment 2

[0037] Embodiment 2 provides a quick-opening blind flange seal ring. As shown in Figure 2 and Figure 3 , the seal ring is disposed in the seal groove 13 of the head 12 and forms a sealing surface with the blind flange cover 14. It includes a body 1 with a saddle-shaped cross-section and a first upturned foot 2, a second upturned foot 3, and a third upturned foot 6 connected to the outer wall surface of the body 1. The first upturned foot 2 and the second upturned foot 3 are oppositely arranged on the lower side of the body 1 to form a first pressure chamber 4, and the third upturned foot 6 is inclinedly arranged on the upper side of the body 1 to form a second pressure chamber 7. The opening of the second pressure chamber 7 faces the high-pressure raw gas side, and the first pressure chamber 4 communicates with the second pressure chamber 7 through the equalizing hole 5.

[0038] Wherein, on the same side end of the body 1 as the third upturned foot 6, a first easily extrudable portion 8 and a second easily extrudable portion 9 are provided. The first easily extrudable portion 8 and the second easily extrudable portion 6 are connected in sequence to form a stepped shape, and a metal ring 11 is bonded in the stepped groove at the second easily extrudable portion 6. The cross-sectional length and width of the metal ring 11 are both greater than the cross-sectional length and width of the second easily extrudable portion 9, to prevent the seal ring from being deformed due to shear force, which may cause the quick-opening blind flange seal to fail.

[0039] In this embodiment, to better optimize the stress distribution of the seal ring, the above-mentioned second pressure chamber 7 is inclinedly arranged, and the included angle α between the bottom wall surface of the second pressure chamber 7 and the horizontal plane is 10°, so that the second pressure chamber 7 has sufficient pressure-bearing volume.

[0040] In addition, to prevent the equalizing hole 5 from being possibly blocked by the third upturned foot 6, the distance L1 from the end of the first easily extrudable portion 8 to the top of the third upturned foot 6 is less than the distance L2 from the end of the first easily extrudable portion 8 to the center of the equalizing hole 5.

[0041] In this embodiment, to improve the reliability of the seal ring, the metal ring 11 is a component made of stainless steel, and the body 1 is a component made of rubber. For example, the metal ring 11 uses stainless steel S30408, and the body 1 uses nitrile rubber material.

[0042] In some possible embodiments, to prevent impurities from entering the first pressure chamber 4, a filter element is also embedded in the equalizing hole 5.

[0043] ​​​​The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above description is only the specific embodiments of the present utility model and is not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A quick-opening blind flange sealing ring, characterized in that It includes a body (1) with a saddle-shaped cross-section, as well as a first upturned foot (2), a second upturned foot (3), and a third upturned foot (6) connected to the outer wall surface of the body (1). Among them, the first upturned foot (2) and the second upturned foot (3) are oppositely arranged on the lower side of the body (1) to form a first pressure-receiving inner cavity (4), the third upturned foot (6) is arranged on the upper side of the body (1) to form a second pressure-receiving inner cavity (7), the opening of the second pressure-receiving inner cavity (7) faces the high-pressure raw gas side, and the first pressure-receiving inner cavity (4) is communicated with the second pressure-receiving inner cavity (7) through a flat pressure hole (5).

2. The quick-opening blind flange sealing ring according to claim 1, characterized in that, On the same side end of the body (1) as the third upturned foot (6), a first easily extruded part (8) and a second easily extruded part (9) are provided, and the first easily extruded part (8) and the second easily extruded part (9) are sequentially connected to form a stepped shape.

3. The quick-opening blind flange sealing ring according to claim 2, wherein, And the included angle between the first easily extruded part (8) and the second easily extruded part (9) is 120° to 150°.

4. The quick-opening blind flange sealing ring according to claim 2, wherein, A chamfer (10) is provided at the outer end of the bottom wall of the second easily extruded part (9).

5. The quick-opening blind flange sealing ring according to claim 2, characterized in that A metal ring (11) is bonded to the stepped groove at the second easily extruded part (9).

6. The quick-opening blind flange sealing ring according to claim 5, characterized in that, The metal ring (11) is a component made of stainless steel.

7. The quick-opening blind flange sealing ring according to claim 5, characterized in that, The cross-sectional length and width of the metal ring (11) are both larger than the cross-sectional length and width of the second easily extruded part (9).

8. A quick-opening blind flange sealing ring according to any one of claims 2 or 5 - 7, characterized in that, The second pressure-receiving inner cavity (7) is inclined, and the included angle α between the bottom wall surface of the second pressure-receiving inner cavity (7) and the horizontal plane is between 0° and 20°.

9. The quick-opening blind flange sealing ring according to claim 8, wherein, The distance L1 from the end of the first easily extruded part (8) to the top of the third upturned foot (6) is less than the distance L2 from the end of the first easily extruded part (8) to the center of the flat pressure hole (5).

10. A quick-opening blind flange sealing ring according to claim 8, characterized in that, A filter element is embedded in the flat pressure hole (5).

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