Oil-gas-free efficient sealing structure

Abstract

The utility model relates to an oil-gas-free efficient sealing structure which comprises a mechanical seal and a liquid filling seal which are arranged between a floating roof and a tank wall. The mechanical seal comprises a metal elastic plate, a barrier film and a supporting plate which are sequentially stacked. The right ends of the metal elastic plate, the barrier film and the supporting plate are fixedly arranged at the mounting point on the side part of the floating roof, and the left ends are tightly attached to the tank wall by virtue of the elasticity of the metal elastic plate; the liquid filling seal comprises an annular hanging belt which is installed on the side portion of the floating roof and located between the floating roof and the supporting plate, a liquid filling pipe body is arranged in an annular space between the hanging belt and the floating roof, and a liquid filling pipe is arranged on the liquid filling pipe body. The lower end of the liquid filling pipe extends into the liquid filling pipe body, the middle part is connected with the floating roof, and the upper end is provided with a liquid filling valve. The sealing device is simple in structure, convenient to operate, high in efficiency, good in sealing effect, small in oil gas loss and good in safety.

Description

Technical Field

[0001] This utility model relates to an oil-free, high-efficiency sealing structure, belonging to the field of oil tank sealing technology. Background Technology

[0002] When designing and constructing external floating roof tanks, in order to ensure that the floating roof can move up and down flexibly, a certain annular gap needs to be maintained between the outer edge of the floating roof and the tank wall plate. This annular gap is the necessary space for the floating roof to move up and down. This annular space is connected to the exposed oil surface inside the tank and is the main channel for the release of oil and gas. It is usually sealed with a sealing device to reduce the evaporation loss of oil and gas.

[0003] Due to manufacturing processes, storage tanks generally exhibit deformations such as elliptic shapes, especially large tanks which experience even greater deformation. Therefore, sealing devices must be able to withstand oil and gas leaks even under these deformed conditions. Furthermore, protrusions, depressions, and weld seams on the tank wall surface can also create points of leakage. To address these issues, the industry employs mechanical seal structures using metal elastic plates. These plates utilize their elasticity to adhere tightly to the tank wall, achieving a near-zero gap and thus ensuring a complete oil and gas seal.

[0004] However, while existing mechanical seals can adapt to the elliptical deformation of storage tanks and provide good sealing, the large annular space between the metal elastic plate and the floating roof easily accumulates a large amount of volatile oil and gas, resulting in high oil and gas evaporation losses and significant safety hazards, thus affecting the operational safety of the storage tank. Therefore, there is an urgent need for an oil-free, high-efficiency sealing structure that is simple in structure, easy to operate, has good sealing performance, low oil and gas loss, and high safety. Summary of the Invention

[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide an oil-free, high-efficiency sealing structure that is simple in structure, easy to operate, has a good sealing effect, low oil and gas loss, and good safety.

[0006] The purpose of this utility model is achieved as follows:

[0007] An oil-free, high-efficiency sealing structure includes a mechanical seal disposed between the floating roof and the tank wall, wherein the mechanical seal comprises a metal elastic plate, a barrier membrane, and a support plate stacked sequentially.

[0008] The right ends of the metal elastic plate, the barrier membrane, and the support plate are fixed together at the mounting point on the side of the floating roof, while the left end relies on the elasticity of the metal elastic plate to fit tightly against the tank wall. An annular liquid-filled bladder is set in the annular space between the mechanical seal and the floating roof. The liquid-filled bladder is filled with brine, and the expansion force generated by the liquid-filled bladder itself makes it in close contact with the support plate on the left and the side of the floating roof on the right, respectively, to achieve the isolation of oil and gas.

[0009] Furthermore, the installation point is provided with an L-shaped installation block, which is fixed to the side of the floating roof by bolts; the common right end of the metal elastic plate, barrier membrane and support plate of the mechanical seal is fixed to the L-shaped installation block by a pressure plate and bolts.

[0010] Furthermore, the outer surface of the fluid-filled bladder is provided with a serrated structure to improve its wear resistance and sealing performance with the support plate and floating roof.

[0011] Furthermore, the saline solution volume ratio inside the fluid-filled bladder is 60%~70%.

[0012] Furthermore, the concentration of the saline solution is 10% to 15%.

[0013] Furthermore, both the liquid-filled bladder and the barrier membrane are made of polymer materials.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention features a liquid-filled bladder seal within the annular space between the mechanical seal and the floating roof, significantly reducing the space available for oil and gas volatilization. Furthermore, the mechanical seal and the liquid-filled bladder seal form a double-seal structure, preventing oil and gas from evaporating into the annular space. This design offers excellent sealing performance, strong oil and gas barrier properties, minimal oil and gas evaporation, a simple overall structure, easy and efficient installation and operation, good sealing effect, low oil and gas loss, and high safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the oil-free, high-efficiency sealing structure of this utility model.

[0017] Figure 2 This is a partially enlarged schematic diagram of the mechanical seal of the oil-free, high-efficiency sealing structure of this utility model.

[0018] in:

[0019] Floating roof 1, tank wall 2, liquid filling bladder 3, metal elastic plate 4, barrier membrane 5, support plate 6, L-shaped mounting block 7, pressure plate 8. Detailed Implementation

[0020] See Figures 1-2This utility model relates to an oil-free, high-efficiency sealing structure, comprising a mechanical seal disposed between a floating roof 1 and a tank wall 2. The mechanical seal comprises a metal elastic plate 4, a barrier membrane 5, and a support plate 6 stacked sequentially. The right ends of the metal elastic plate 4, the barrier membrane 5, and the support plate 6 are jointly fixed to an installation point on the side of the floating roof 1, while the left end relies on the elasticity of the metal elastic plate 4 to tightly adhere to the tank wall 2. The installation point is provided with an L-shaped mounting block 7, which is fixed to the side of the floating roof 1 by bolts. The common right ends of the metal elastic plate 4, the barrier membrane 5, and the support plate 6 of the mechanical seal are stacked sequentially on the horizontal section of the L-shaped mounting block 7 and fixed by a pressure plate 8 and bolts. The metal elastic plate 4 is preferably made of stainless steel, utilizing its own elasticity to maintain close contact with the tank wall 2 at all times, which can meet the sealing requirements of the tank wall 2 for large elliptical deformation, surface protrusions, depressions, and weld seams. The barrier membrane 5 is a polymer material, preferably fluororubber, nitrile rubber, EPDM rubber, etc., to block oil and gas.

[0021] An annular liquid-filled bladder 3 is installed in the annular space between the mechanical seal and the floating roof 1. The bottom of the liquid-filled bladder 3 is immersed in the oil in the storage tank, and it is supported upward by the buoyancy of the oil. The two sides are in close contact with the support plate 6 and the floating roof 1 respectively to form a seal. A curved part is provided at the lower end of the metal elastic plate 4, which can prevent the liquid-filled bladder 3 from falling downward when the oil level is lower than the lower end of the metal elastic plate 4. A serrated structure is provided on the outer surface of the liquid-filled bladder 3 to improve its wear resistance and sealing performance with the support plate 6 and the floating roof 1. The liquid-filled bladder 3 is made of polymer material, preferably fluororubber, nitrile rubber, EPDM rubber, etc.

[0022] The liquid-filled bladder 3 is filled with 60% to 70% saline solution by volume, and the saline solution concentration is 10% to 15%. Utilizing the expansion force generated by the liquid-filled bladder 3 itself, it makes close contact with the side of the support plate 6 on the left and the floating roof 1 on the right, thereby achieving the isolation of oil and gas.

[0023] The mechanical seal of this invention utilizes the tight fit between the metal elastic plate 4 and the tank wall, approaching zero gaps, resulting in good sealing performance and strong oil and gas barrier capability. In the annular gap space between the mechanical seal and the floating roof 1, a liquid-filled bladder is used to seal and fill the gap, significantly reducing the space where oil and gas can accumulate, reducing oil and gas loss, and forming a two-layer sealing structure to further improve sealing performance. The overall structure is simple, easy to operate, efficient, has a good sealing effect, low oil and gas loss, and good safety.

[0024] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. An oil-free, high-efficiency sealing structure, comprising a mechanical seal disposed between the floating roof (1) and the tank wall (2), characterized in that: The mechanical seal comprises a metal elastic plate (4), a barrier membrane (5), and a support plate (6) stacked in sequence. The right ends of the metal elastic plate (4), the barrier membrane (5) and the support plate (6) are fixed together at the mounting point on the side of the floating roof (1), and the left end relies on the elasticity of the metal elastic plate (4) to tightly adhere to the tank wall (2); an annular liquid-filled bladder (3) is set in the annular space between the mechanical seal and the floating roof (1); the liquid-filled bladder (3) is filled with brine, and the expansion force formed by the liquid-filled bladder (3) itself is used to make it closely contact the support plate (6) on the left and the side of the floating roof (1) on the right, so as to achieve the isolation of oil and gas.

2. The oil-free, high-efficiency sealing structure according to claim 1, characterized in that: The installation point is provided with an L-shaped installation block (7), which is fixed to the side of the floating roof (1) by bolts; the common right end of the mechanical seal's metal elastic plate (4), barrier membrane (5) and support plate (6) is fixed to the L-shaped installation block (7) by a pressure plate (8) and bolts.

3. The oil-free, high-efficiency sealing structure according to claim 1, characterized in that: The outer surface of the liquid-filled bladder (3) is provided with a serrated structure to improve its wear resistance and sealing with the support plate (6) and the floating roof (1).

4. The oil-free, high-efficiency sealing structure according to claim 1, characterized in that: The saline solution volume ratio inside the fluid-filled bladder (3) is 60%~70%.

5. The oil-free, high-efficiency sealing structure according to claim 1, characterized in that: The concentration of the brine is 10% to 15%.

6. The oil-free, high-efficiency sealing structure according to claim 1, characterized in that: Both the liquid-filled capsule (3) and the barrier membrane (5) are made of polymer materials.

Images