Segmented groove type special-shaped sealing structure suitable for offshore platform explosion-proof tank

Abstract

The utility model discloses a segmented groove type special-shaped sealing structure suitable for an offshore platform explosion-proof box. The segmented groove type special-shaped sealing structure comprises a first-stage sealing structure, a second-stage sealing structure and a third-stage sealing structure which are sequentially arranged from the center to the periphery. The first-stage sealing structure comprises a lower annular groove formed in the top face of the anti-explosion box body, an upper annular groove formed in the bottom face of the anti-explosion box cover and a self-tightening gasket with the two ends arranged in the lower annular groove and the upper annular groove respectively. The second-stage sealing structure comprises a lower groove formed in the top surface of the explosion-proof box body and a sealing ring I arranged in the lower groove; the three-stage sealing structure comprises an upper groove formed in the bottom face of the anti-explosion box cover, a protruding ring formed on the top face of the anti-explosion box body and a second sealing ring arranged in the upper groove. According to the explosion-proof box, comprehensive adaptation to explosion-proof scenes is achieved through a multi-layer sealing structure, the air tightness of the explosion-proof box is fully guaranteed, the sealing performance and the environment adaptability are remarkably improved, and the service life of the explosion-proof box is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of explosion-proof equipment, specifically relating to a segmented groove-type irregular sealing structure suitable for explosion-proof boxes on offshore platforms. Background Technology

[0002] Existing explosion-proof boxes mostly use traditional rubber gaskets or metal sealing rings for single-layer sealing. While these provide basic airtightness and pressure resistance, long-term use in the harsh environment of offshore platforms presents the following problems: (1) Insufficient sealing layers. Especially under harsh environmental conditions, a single sealing layer cannot effectively cope with challenges such as high temperature, high humidity, and corrosive gases, posing a risk of sealing performance degradation. The sealing effect needs to be upgraded. (2) The contact surface between the box body and the box cover lacks effective positioning design. Although rubber gaskets can temporarily provide a certain sealing effect, the box cover is prone to displacement or deformation during frequent disassembly, transportation, or use, leading to sealing failure and affecting the airtightness and safety of the explosion-proof box. (3) The offshore platform environment is complex and harsh. Long-term exposure to high temperature, high humidity, corrosive gases, and marine salt spray conditions results in low tolerance of conventional sealing materials, which are prone to aging and damage, and cannot provide long-term stable sealing protection. Therefore, it is necessary to design a new type of explosion-proof box with multiple sealing structures suitable for offshore platforms. Utility Model Content

[0003] This utility model is proposed to overcome the problems of sealing failure and positioning misalignment that easily occur in the prior art for explosion-proof boxes. Its purpose is to provide a segmented groove-type irregular sealing structure suitable for explosion-proof boxes on offshore platforms.

[0004] This utility model is achieved through the following technical solution:

[0005] A segmented groove-type irregular sealing structure suitable for explosion-proof containers on offshore platforms includes a primary sealing structure, a secondary sealing structure, and a tertiary sealing structure arranged sequentially from the center to the periphery. The primary sealing structure includes a lower annular groove formed on the top surface of the explosion-proof container body, an upper annular groove formed on the bottom surface of the explosion-proof container cover, and self-tightening gaskets with their two ends respectively placed in the lower annular groove and the upper annular groove. The secondary sealing structure includes a lower groove formed on the top surface of the explosion-proof container body and a No. I sealing ring disposed in the lower groove. The tertiary sealing structure includes an upper groove formed on the bottom surface of the explosion-proof container cover, a convex ring formed on the top surface of the explosion-proof container body, and a No. II sealing ring disposed in the upper groove.

[0006] In the above technical solution, the cross-sections of the lower annular groove and the upper annular groove are both isosceles trapezoids that are wider on the inside and narrower on the outside, and the two are arranged in a mirror symmetrical manner.

[0007] In the above technical solution, the included angle between the wall and bottom of the lower and upper annular grooves is 113°.

[0008] In the above technical solution, a dynamic sealing layer is provided on the outer walls of the lower annular groove and the upper annular groove; the dynamic sealing layer is a reinforced graphite material.

[0009] In the above technical solution, the cross-section of the lower trench is rectangular;

[0010] In the above technical solution, the No. I sealing ring is a flexible and extensible sealing ring; the No. I sealing ring includes a sealing shell and a spring disposed inside the sealing shell, the sealing shell is a polymer composite material, and the spring is a fatigue-resistant metal spring.

[0011] In the above technical solution, the longitudinal section of the No. II sealing ring is U-shaped, and the opening faces the explosion-proof box. The convex ring is inserted into the U-shaped cavity of the No. II sealing ring.

[0012] The above technical solution also includes a four-level sealing structure, which includes a raised edge formed on the edge of the top surface of the explosion-proof enclosure and an anti-seepage sealant filled between the raised edge and the outer wall of the explosion-proof enclosure cover.

[0013] In the above technical solution, the explosion-proof enclosure and the explosion-proof cover are connected and fixed by precisely aligned fastening holes and high-strength bolts.

[0014] In the above technical solution, the explosion-proof box, which consists of the explosion-proof box body and the explosion-proof box cover, is filled with nitrogen.

[0015] The beneficial effects of this utility model are:

[0016] This utility model provides a segmented groove-type irregular sealing structure suitable for explosion-proof boxes on offshore platforms. Through the segmented groove-type irregular design and the application of innovative sealing rings, the sealing performance, airtightness and overall safety of the explosion-proof box are further enhanced. It can provide excellent airtightness and durability, thereby effectively overcoming the sealing failure and positioning misalignment problems that are prone to occur in the prior art. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] in:

[0019] 1. Explosion-proof enclosure; 11. Lower ring groove; 12. Raised edge; 13. Raised ring;

[0020] 2. Explosion-proof box cover; 21. Upper ring groove;

[0021] 3. Bolts;

[0022] 4. Self-tightening gasket;

[0023] 5. Expansion seal ring;

[0024] 6. U-shaped sealing ring;

[0025] 7. Sealant.

[0026] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, a segmented groove-type irregular sealing structure suitable for explosion-proof boxes on offshore platforms includes a primary sealing structure, a secondary sealing structure, a tertiary sealing structure, and a quaternary sealing structure arranged sequentially from the center to the periphery.

[0029] The primary sealing structure includes a lower annular groove 11 formed on the top surface of the explosion-proof enclosure 1, an upper annular groove 21 formed on the bottom surface of the explosion-proof enclosure cover 2, and a self-tightening gasket 4 with its two ends placed in the lower annular groove 11 and the upper annular groove 21 respectively.

[0030] The cross-sections of the lower annular groove 11 and the upper annular groove 21 are both isosceles trapezoids that are wider on the inside and narrower on the outside, and the two are arranged in a mirror symmetrical manner.

[0031] The included angle between the groove wall and the bottom of the lower annular groove 11 and the upper annular groove 21 is 113°; the angle design of the lower annular groove 11 and the upper annular groove 21 limits the maximum deformation range of the self-tightening gasket 4 in the radial direction, and avoids sealing failure due to excessive deformation.

[0032] The inner walls of the lower annular groove 11 and the upper annular groove 21 serve as supporting groove surfaces, while the outer walls undergo surface modification treatment and are composited with reinforced graphite material that has high temperature resistance and corrosion resistance, forming a dynamic sealing layer with self-lubricating properties. This achieves multi-dimensional isolation between the gas flow inside the box and the outside, enhances the sealing effect, and effectively blocks the gas flow between the box and the outside, serving as the first layer of sealing for the explosion-proof box.

[0033] The self-tightening gasket 4 has an adaptive compression function. When the explosion-proof cover 2 is sealed with the explosion-proof box body 1, the self-tightening gasket 4 generates elastic compression in the radial direction until it is tightly fitted with the upper and lower trapezoidal annular grooves. The height dimension of the self-tightening gasket 4 can provide sufficient self-tightening force, thereby ensuring a good sealing effect.

[0034] The secondary sealing structure includes a lower groove formed on the top surface of the explosion-proof enclosure 1 and a No. I sealing ring 5 disposed in the lower groove;

[0035] The cross-section of the lower trench is rectangular;

[0036] The No. 1 sealing ring 5 is a flexible and extensible sealing ring. The No. 1 sealing ring 5 includes a sealing shell and a spring disposed inside the sealing shell. The sealing shell is a high-molecular composite material, preferably surface-treated polytetrafluoroethylene (PTFE), which imparts high wear resistance and a low coefficient of friction in extreme environments, enhancing the reliability of the seal. The spring is a fatigue-resistant metal spring, preferably made of corrosion-resistant stainless steel, making it adaptable to various dynamic pressure environments. The structural design of the No. 1 sealing ring 5 improves the sealing ring's resistance to pressure, temperature, and chemical corrosion, significantly improving the long-term stability and adaptability of the sealing assembly in high-temperature, highly corrosive, and high-pressure marine environments. It avoids the performance degradation of traditional sealing rings due to pressure and chemical corrosion, effectively improving the airtightness and pressure resistance of the explosion-proof enclosure, ensuring stable sealing even under high pressure or high temperature environments, reducing the risk of gas leakage, and extending the service life of the explosion-proof enclosure. The secondary sealing structure provides a second layer of additional sealing performance and stability.

[0037] The three-stage sealing structure includes an upper groove formed on the bottom surface of the explosion-proof cover 2, a convex ring 13 formed on the top surface of the explosion-proof enclosure 1, and a No. II sealing ring 6 disposed in the upper groove. The No. II sealing ring 6 has a U-shaped longitudinal section with its opening facing the explosion-proof enclosure 1, and the convex ring 13 is inserted into the U-shaped cavity of the No. II sealing ring 6. When the explosion-proof cover 2 is closed, the convex ring 13 compresses the No. II sealing ring 6, which can ensure that the No. II sealing ring 6 and the upper groove are precisely fitted under pressure, preventing positioning displacement caused by vibration or external force, thereby maintaining long-term sealing stability and playing a radial fixing role. The sealing structure is more stable, achieving a more efficient seal and realizing a third layer of sealing.

[0038] The four-level sealing structure includes a raised edge 12 formed on the edge of the top surface of the explosion-proof enclosure 1 and an anti-seepage sealant 7 filled between the raised edge 12 and the outer wall of the explosion-proof enclosure cover 2; the anti-seepage sealant 7 further blocks the intrusion of external gas, water vapor and dust, while suppressing gas leakage inside the enclosure, thus achieving a fourth layer of sealing.

[0039] The explosion-proof enclosure 1 and explosion-proof cover 2 are connected and fixed by precisely aligned fastening holes and high-strength bolts 3, further improving the sealing tightness. The precisely aligned fastening holes and high-strength bolts 3, combined with the three-stage sealing structure, ensure the positional accuracy of the explosion-proof enclosure 1 and explosion-proof cover 2. The bolt tightening force ensures the position of the self-tightening gasket in the trapezoidal annular groove, preventing its displacement or deformation. The design of the bolts and self-tightening gaskets ensures precise positioning between the cover and the enclosure. The bolt tightening force is optimized to ensure the stability of the self-tightening sealing structure within the sealing groove while applying uniform pressure, preventing displacement or local deformation due to external forces or pressure changes. This structural design not only effectively improves the airtight connection performance between the cover and the enclosure but also avoids sealing failure caused by positional deviations or external vibrations during installation.

[0040] The explosion-proof enclosure is filled with nitrogen to maintain a suitable pressure level inside the enclosure and create a positive pressure environment. This can further prevent external gases, water vapor and dust from entering the enclosure and prevent gas from leaking out of the enclosure. At the same time, it creates an inert gas environment to inhibit oxidation reactions, thereby reducing the potential risk of explosion and ensuring the safe operation of the equipment in harsh environments.

[0041] This invention achieves comprehensive adaptability to explosion-proof scenarios through a multi-layered sealing structure, fully ensuring the airtightness of the explosion-proof box, significantly improving sealing performance and environmental adaptability, and extending the service life of the explosion-proof box.

[0042] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A segmented groove-type irregular sealing structure suitable for explosion-proof boxes on offshore platforms, characterized in that: It includes a primary sealing structure, a secondary sealing structure, and a tertiary sealing structure arranged sequentially from the center to the periphery; The primary sealing structure includes a lower annular groove (11) formed on the top surface of the explosion-proof enclosure (1), an upper annular groove (21) formed on the bottom surface of the explosion-proof enclosure cover (2), and self-tightening gaskets (4) with their two ends placed in the lower annular groove (11) and the upper annular groove (21) respectively. The secondary sealing structure includes a lower groove formed on the top surface of the explosion-proof enclosure (1) and a No. I sealing ring (5) disposed in the lower groove; The three-level sealing structure includes an upper groove formed on the bottom surface of the explosion-proof box cover (2), a raised ring (13) formed on the top surface of the explosion-proof box body (1), and a No. II sealing ring (6) disposed in the upper groove.

2. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The cross-sections of the lower annular groove (11) and the upper annular groove (21) are both isosceles trapezoids that are wider on the inside and narrower on the outside, and they are arranged in a mirror symmetrical manner.

3. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The angle between the wall and bottom of the lower annular groove (11) and the upper annular groove (21) is 113°.

4. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The outer walls of the lower annular groove (11) and the upper annular groove (21) are provided with dynamic sealing layers; the dynamic sealing layers are made of reinforced graphite material.

5. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The cross-section of the lower trench is rectangular.

6. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The No. I sealing ring (5) is a flexible and extensible sealing ring; the No. I sealing ring (5) includes a sealing shell and a spring disposed inside the sealing shell, the sealing shell is a polymer composite material, and the spring is a fatigue-resistant metal spring.

7. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The longitudinal section of the No. II sealing ring (6) is U-shaped, and the opening faces the explosion-proof box (1). The convex ring (13) is inserted into the U-shaped cavity of the No. II sealing ring (6).

8. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: It also includes a four-level sealing structure, which includes a raised edge (12) formed on the edge of the top surface of the explosion-proof enclosure (1) and an anti-seepage sealant (7) filled between the raised edge (12) and the outer wall of the explosion-proof enclosure cover (2).

9. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The explosion-proof enclosure (1) and the explosion-proof cover (2) are connected and fixed by precisely aligned fastening holes and high-strength bolts (3).

10. The segmented groove-type irregular sealing structure for explosion-proof boxes on offshore platforms according to claim 1, characterized in that: The explosion-proof enclosure (1) and the explosion-proof cover (2) are filled with nitrogen.

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