An adjustable expansion sealing ring

Abstract

This utility model relates to the field of pipeline sealing technology, and in particular to an adjustable expansion sealing ring, aiming to solve the technical problem that existing sealing rings are prone to excessive expansion or deformation in unnecessary areas, leading to a decrease in sealing reliability. Specifically, it includes an inner ring and an outer ring arranged coaxially, with the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring fixedly connected. The inner ring has an annular support groove inside, and an annular support member is installed inside the support groove. The outer ring has multiple expansion chambers arranged equidistantly along the circumference of the outer ring, and each expansion chamber contains a water-swellable filler. This utility model, by providing multiple independent expansion chambers and corresponding water inlets within the outer ring, ensures that when local leakage occurs in the pipeline, only the filler near the leakage point expands through the water inlet, avoiding unnecessary deformation caused by traditional integral expansion structures and improving sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of pipeline sealing technology, and in particular to an adjustable expansion sealing ring. Background Technology

[0002] In the field of pipeline sealing technology, traditional sealing rings typically use fixed-size rubber rings or elastomer materials, relying on pre-compression deformation to achieve a sealing effect. However, such sealing structures are prone to stress relaxation or incomplete sealing during long-term use or when the pipeline undergoes local deformation, leading to an increased risk of leakage.

[0003] To address these issues, some improved solutions employ water-swellable materials (such as expandable rubber) as the sealing body, utilizing their volume increase upon contact with water to achieve self-sealing. However, existing expandable seal structures are mostly monolithic designs, expanding entirely upon contact with water, failing to provide localized responses to specific leak points. This can lead to over-expansion or unnecessary deformation, ultimately affecting seal reliability. Utility Model Content

[0004] The technical problem to be solved by this invention is to provide an adjustable expansion sealing ring that can respond locally to specific leakage points, addressing the shortcomings of existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An adjustable expansion sealing ring, characterized by:

[0007] The device includes an inner ring and an outer ring, which are coaxially arranged. The outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring are fixedly connected. The inner ring has an annular support groove inside, and an annular support member is installed inside the support groove. The outer ring has multiple expansion cavities inside, which are equidistantly arranged along the circumference of the outer ring. Each expansion cavity is filled with a water-swellable filler. Multiple water inlet holes are opened inward on the outer circumferential surface of the outer ring. The inner end of each water inlet hole is connected to a corresponding expansion cavity. The outer end of each water inlet hole is detachably equipped with an end cap, which is configured to form an interference fit with the water inlet hole.

[0008] The technical problem to be solved by this utility model can be further achieved through the following steps: the cross-section of the support groove is rectangular, and the support member is specifically two annular iron wires arranged side by side inside the support groove.

[0009] The technical problem to be solved by this utility model can be further achieved through the following steps: 15-20 expansion cavities are arranged along the circumference of the outer ring body, and the degree of the central angle corresponding to each expansion cavity is 18-24°.

[0010] The technical problem to be solved by this utility model can be further achieved through the following steps: the cross-section of the expansion cavity is rectangular, and the filling body is specifically an expansion rubber block adapted to the interior of the expansion cavity.

[0011] The technical problem to be solved by this utility model can be further achieved through the following steps: the end cap is a solid structure and can block the water inlet hole.

[0012] The technical problem to be solved by this utility model can be further achieved through the following steps: a through hole is coaxially provided in the center of the end cap, a filter is fixedly provided at the inner end of the through hole, and a plug is detachably provided at the outer end of the through hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting multiple independent expansion chambers and corresponding water inlet holes in the outer ring body, when the pipeline has local leakage, only the filler near the leakage point expands through the water inlet hole, realizing a "point-to-point" sealing response, avoiding unnecessary deformation caused by the traditional overall expansion structure, and improving sealing reliability; the opening and closing of the water inlet hole can be controlled by the detachable end cap, and the expansion area to be activated can be manually selected, improving the flexibility of use; the support groove of the inner ring body is set with double ring iron wires, so that the rubber ring still maintains the overall roundness when it expands locally, improving the overall stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a top sectional view of the present invention;

[0016] Figure 3 for Figure 2 Sectional view along direction A;

[0017] Figure 4 A schematic diagram of an end cap with a through hole;

[0018] Figure 1-3 The end caps are solid.

[0019] In the diagram: Inner ring 1, Outer ring 2, Support groove 3, Annular iron wire 4, Expansion chamber 5, Expansion rubber block 6, Water inlet hole 7, End cap 8, Through hole 9, Filter plate 10, Plug 11. Detailed Implementation

[0020] The specific technical solutions of this utility model are further described below to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on the utility model.

[0022] Please refer to Figure 1-3 An adjustable expansion sealing ring includes an inner ring body 1 and an outer ring body 2 coaxially arranged, with the outer circumferential surface of the inner ring body 1 and the inner circumferential surface of the outer ring body 2 fixedly connected; the inner ring body 1 has an annular support groove 3 inside, and an annular support member is provided inside the support groove 3; the outer ring body 2 has multiple expansion cavities 5 inside, which are equidistantly arranged along the circumference of the outer ring body 2, and each expansion cavity 5 is provided with a water-swellable filler inside; multiple water inlet holes 7 are opened inward on the outer circumferential surface of the outer ring body 2, and the inner end of each water inlet hole 7 is connected to a corresponding expansion cavity 5; each water inlet hole 7 has a detachable end cap 8 at its outer end, and the end cap 8 is configured to form an interference fit with the water inlet hole 7.

[0023] Specifically, the inner ring 1 is made of nitrile rubber with a Shore A hardness of 70-90; the outer ring 2 is made of ethylene propylene diene monomer (EPDM) rubber with a Shore A hardness of 40-60. In this way, the inner ring 1 provides stable structural support, ensuring the positioning stability of the sealing ring within the pipe, while the softer outer ring 2 better adapts to the uneven surface of the pipe wall, improving the sealing effect. The difference in hardness between the two materials also ensures that when the outer ring 2 is deformed under pressure, the inner ring 1 maintains its shape, preventing overall instability.

[0024] Furthermore, the cross-section of the support groove 3 is rectangular, and the support component specifically consists of two annular iron wires 4 arranged side by side inside the support groove 3. In this way, the double-wire structure forms a stable support frame, ensuring radial support strength while retaining appropriate axial flexibility, allowing the sealing ring to bend and deform appropriately during pipe installation, facilitating construction and installation.

[0025] Specifically, 15-20 expansion cavities 5 are arranged along the circumference of the outer ring body 2, and the central angle of each expansion cavity 5 is 18-24°. Figure 2 The α angle in the diagram ensures sufficient rubber separation between adjacent expansion cavities 5. This guarantees accurate local expansion while preventing a decrease in the structural strength of the outer ring 2 due to an excessive number of expansion cavities 5.

[0026] Specifically, the expansion cavity 5 has a rectangular cross-section, and the filler is an expansion rubber block 6 that fits inside the expansion cavity 5. The rectangular cross-section design allows the filler to generate a uniform outward expansion force during expansion, avoiding stress concentration problems that may occur with a circular cross-section.

[0027] Specifically, the end cap 8 is a solid structure, capable of sealing the water inlet 7. Thus, by selectively installing the end cap 8 at the water inlet 7, the corresponding expansion cavity 5 can be sealed. Alternatively, please refer to [the following text is missing from the original extract]. Figure 4 The end cap 8 has a through hole 9 at its center. A filter element 10 is fixedly installed at the inner end of the through hole 9, and a plug 11 is detachably installed at the outer end of the through hole 9. The filter element 10 is bonded to the end cap 8, and the plug 11 can form an interference fit with the through hole 9 to seal the through hole 9. In this way, the plug 11 can realize the control of water flow interruption, and the filter element 10 can effectively intercept solid particles in the pipeline medium, ensuring the stable expansion performance of the filler.

[0028] [Working Principle] (The following explanation uses a solid end cap 8) When using this invention, firstly, depending on the location where a leak may occur in the pipeline, selectively remove the end cap 8 on the corresponding water inlet 7 to activate the corresponding expansion chamber 5. When a leak occurs in the pipeline, fluid seeps between the outer ring and the pipeline, and then enters the expansion chamber 5 through the opened water inlet 7. Upon contact with the filler, it causes the filler to expand in volume. The expanding filler pushes the outer ring 2 to expand locally outward, forming a tight fit with the inner wall of the pipeline, thereby achieving a precise seal. The expansion chamber 5 corresponding to the unopened water inlet 7 remains unchanged, ensuring normal flow in non-leakage areas.

[0029] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. An adjustable expansion sealing ring, characterized in that: The device includes an inner ring and an outer ring, which are coaxially arranged. The outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring are fixedly connected. The inner ring has an annular support groove inside, and an annular support member is installed inside the support groove. The outer ring has multiple expansion cavities inside, which are equidistantly arranged along the circumference of the outer ring. Each expansion cavity is filled with a water-swellable filler. Multiple water inlet holes are opened inward on the outer circumferential surface of the outer ring. The inner end of each water inlet hole is connected to a corresponding expansion cavity. The outer end of each water inlet hole is detachably equipped with an end cap, which is configured to form an interference fit with the water inlet hole.

2. The adjustable inflation o-ring of claim 1, wherein: The cross-section of the support groove is rectangular, and the support member is specifically two annular iron wires arranged side by side inside the support groove.

3. The adjustable expansion sealing ring according to claim 1, characterized in that: The expansion cavities are arranged in 15-20 circumferential directions along the outer ring body, and the central angle of each expansion cavity is 18-24°.

4. The adjustable expansion sealing ring according to claim 1, characterized in that: The expansion cavity has a rectangular cross-section, and the filler is specifically an expansion rubber block adapted to the interior of the expansion cavity.

5. The adjustable expansion sealing ring according to claim 1, characterized in that: The end cap is a solid structure and can seal the water inlet hole.

6. The adjustable expansion sealing ring according to claim 1, characterized in that: The end cap has a through hole coaxially formed at its center. A filter is fixedly installed at the inner end of the through hole, and a plug is detachably installed at the outer end of the through hole.

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