Metal thin-wall pipe connecting pipe fitting structure
By using threaded connections and multiple sealing designs between inner and outer ring double-sealed pipe fittings, the problem of insufficient sealing in existing technologies is solved, achieving reliable connections under high pressure and vibration environments. This makes the technology suitable for petrochemical and water supply and drainage applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU ZHONGRONG HUAYU TECHNOLOGY CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-04-17
AI Technical Summary
Existing thin-walled metal pipe connection fittings suffer from insufficient sealing performance due to their single-process design. They cannot effectively seal under high pressure or vibration environments, and have poor compatibility, high cost, and are difficult to adapt to complex working conditions.
The pipe fittings are connected by threads using inner and outer ring clamp double sealing fittings. The design combines O-rings and sealing rubber rings for multiple sealing. Mechanical locking and elastic sealing are achieved by thread engagement and external clamp pressure, which enhances tensile strength and sealing performance.
It significantly improves the reliability and applicability of the connection, effectively prevents media leakage in high-pressure and vibration environments, reduces operation and maintenance costs, and is suitable for harsh scenarios such as petrochemical and water supply and drainage.
Smart Images
Figure CN224135370U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe connection technology, and more specifically, to a metal thin-walled pipe connection pipe structure. Background Technology
[0002] Existing metal thin-walled pipe connection structures suffer from limited sealing performance due to the reliance on either ring compression or crimping processes. This prevents the optimization of sealing through process synergy. While ring compression provides uniform radial pressure, it demands high pipe precision and is prone to over-compression failure of the sealing ring due to localized stress concentration. Crimping, on the other hand, offers convenient installation but suffers from weak axial sealing, making the sealing ring susceptible to displacement and detachment under high pressure or vibration. Furthermore, the single-process design results in poor pipe compatibility, requiring the development of custom molds for different specifications, increasing costs, and making it difficult to adapt to complex operating conditions such as high temperatures and corrosive fluids. The stress state of the sealing ring cannot be adjusted through diverse processes, and sealing reliability is constrained by the fixed connection method. Therefore, innovative structures are urgently needed to achieve synergy between ring compression and crimping, improving sealing redundancy and pipe applicability to meet the diverse demands of modern industry for efficient and safe pipe connections. Thus, improvements and optimizations are necessary. Utility Model Content
[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a metal thin-walled pipe connection structure, which has the advantage of increasing sealing performance.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a metal thin-walled pipe connection structure, including an inner ring clamp double-seal pipe fitting, an outer ring clamp double-seal pipe fitting movably sleeved on the outer surface of the inner ring clamp double-seal pipe fitting, an external thread provided on the left side of the outer surface of the inner ring clamp double-seal pipe fitting, an internal thread provided on the inner wall of the outer ring clamp double-seal pipe fitting, and the inner ring clamp double-seal pipe fitting and the outer ring clamp double-seal pipe fitting are threadedly connected by the external thread and the internal thread, and an O-ring and a sealing rubber ring are movably sleeved between the inner ring clamp double-seal pipe fitting and the outer ring clamp double-seal pipe fitting.
[0005] As a preferred technical solution of this utility model, the inner wall of the outer ring double sealing pipe fitting is provided with a sealing ring groove and a sealing ring groove, the cross-section of the O-ring is O-shaped, the O-ring is located inside the sealing ring groove, and the sealing rubber ring is located inside the sealing ring groove.
[0006] As a preferred embodiment of this utility model, the O-ring is made of EPDM rubber and the sealing rubber ring is made of silicone rubber.
[0007] As a preferred embodiment of this utility model, the sealing rubber ring and the sealing ring groove are mutually adapted, and the O-ring seal and the sealing ring groove are mutually adapted.
[0008] As a preferred embodiment of this utility model, the inner ring clamp double-sealed pipe fitting is made of stainless steel, and the outer ring clamp double-sealed pipe fitting is made of stainless steel.
[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0010] This utility model, through its multi-layered sealing and reinforcement design, significantly improves the reliability and applicability of pipe connections. Operators rotate the inner ring clamp double-seal fitting to engage the external and internal threads, first enhancing tensile strength through mechanical engagement and forming a basic connection structure. Then, external calipers apply pressure to the sealing ring groove on the outer surface of the outer ring clamp double-seal fitting, driving the O-ring and sealing rubber ring to squeeze and fill the gap between the inner and outer ring clamp double-seal fittings. Elastic deformation eliminates microscopic voids and increases contact surface friction, achieving a dual effect of physical sealing and mechanical locking, forming multi-layered protection. This effectively resists the risk of media leakage under complex conditions such as high pressure and vibration. The entire connection method combines the high strength of threaded connections with the high reliability of elastic seals, requiring no additional sealant or complex tools. It is convenient to operate and allows for quick disassembly and maintenance, making it suitable for petrochemical and water supply and drainage applications with stringent requirements for sealing and tensile strength. This significantly reduces the risk of leakage and maintenance costs in pipeline systems. Attached Figure Description
[0011] Figure 1 This is a frontal three-dimensional appearance structural diagram of the present utility model;
[0012] Figure 2 This is a schematic diagram of the outer ring clamp double-sealed pipe fitting structure of this utility model;
[0013] Figure 3 This is a schematic diagram of the inner ring clamp double-sealed pipe fitting structure of this utility model;
[0014] Figure 4 This is a schematic diagram of the internal thread structure of this utility model;
[0015] Figure 5 This utility model Figure 4 Enlarged view of point A in the middle.
[0016] In the diagram: 1. Inner ring clamp double-seal pipe fitting; 2. Outer ring clamp double-seal pipe fitting; 3. O-ring seal; 4. Sealing rubber ring; 5. External thread; 6. Internal thread. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] like Figures 1 to 5 As shown, this utility model provides a metal thin-walled pipe connection fitting structure. An outer ring double-seal fitting 2 is movably sleeved on the outer surface of the inner ring double-seal fitting 1. An external thread 5 is provided on the left side of the outer surface of the inner ring double-seal fitting 1. An internal thread 6 is provided on the inner wall of the outer ring double-seal fitting 2. The inner ring double-seal fitting 1 and the outer ring double-seal fitting 2 are threadedly connected by the external thread 5 and the internal thread 6. An O-ring 3 and a sealing rubber ring 4 are movably sleeved between the inner ring double-seal fitting 1 and the outer ring double-seal fitting 2.
[0019] When workers need to connect the inner ring clamp double-seal fitting 1 and the outer ring clamp double-seal fitting 2, they first rotate the inner ring clamp double-seal fitting 1 by external force to connect the external thread 5 and the internal thread 6, which increases tensile strength and sealing performance. Then, using external calipers, they clamp the outer surface sealing ring groove of the outer ring clamp double-seal fitting 2. When the calipers apply pressure to the outer surface sealing ring groove of the outer ring clamp double-seal fitting 2, they will compress the O-ring seal 3, and the compression of the O-ring seal 3 will fill the inner ring clamp double-seal fitting. The gap between fitting 1 and outer ring clamp double-seal fitting 2 will increase the friction between inner ring clamp double-seal fitting 1 and outer ring clamp double-seal fitting 2, thereby increasing the sealing performance of the connection between inner ring clamp double-seal fitting 1 and outer ring clamp double-seal fitting 2. When the caliper applies pressure to the sealing ring groove on the outer surface of outer ring clamp double-seal fitting 2, the sealing rubber ring 4 will fit tightly against the inner wall of the sealing ring groove and the outer surface of inner ring clamp double-seal fitting 1. Through the joint cooperation of sealing rubber ring 4 and O-ring seal 3, the sealing performance of the connection between inner ring clamp double-seal fitting 1 and outer ring clamp double-seal fitting 2 will be increased.
[0020] This pipe connection device, through multiple sealing and reinforcement designs, significantly improves connection reliability and applicability. Operators rotate the inner ring clamp double-seal fitting 1 to engage the external thread 5 and internal thread 6. First, mechanical engagement enhances tensile strength, forming the basic connection structure. Then, external pipe wrenches apply pressure to the sealing ring groove on the outer surface of the outer ring clamp double-seal fitting 2, driving the O-ring seal 3 to squeeze and fill the gap between the inner and outer ring clamp double-seal fittings 1 and 2. Elastic deformation eliminates microscopic voids while increasing contact surface friction, achieving a dual effect of physical sealing and mechanical locking. The sealing rubber ring 4 further optimizes the sealing path, forming multi-layered protection, effectively resisting the risk of media leakage under complex conditions such as high pressure and vibration. The entire connection method combines the high strength of threaded connections with the high reliability of elastic seals, requiring no additional sealant or complex tools. It is convenient to operate and allows for quick disassembly and maintenance, suitable for petrochemical and water supply and drainage applications with stringent requirements for sealing and tensile strength, significantly reducing pipeline system leakage risks and maintenance costs.
[0021] The inner wall of the outer ring double-sealed pipe fitting 2 is provided with a sealing ring groove and a sealing ring groove. The cross-section of the O-ring 3 is O-shaped. The O-ring 3 is located inside the sealing ring groove. The sealing rubber ring 4 is located inside the sealing ring groove. The sealing rubber ring 4 and the sealing ring groove are mutually compatible. The O-ring 3 and the sealing ring groove are mutually compatible.
[0022] When the external caliper is clamped at the sealing ring groove on the outer surface of the outer ring double-seal fitting 2, and when the ring is pressed at the sealing ring groove on the outer surface of the outer ring double-seal fitting 2, under the squeezing action of the outer ring double-seal fitting 2, the O-ring 3 and the sealing rubber ring 4 fill the gap between the inner ring double-seal fitting 1 and the outer ring double-seal fitting 2 on both sides, thereby increasing the sealing performance.
[0023] Among them, the O-ring 3 is made of EPDM rubber, and the sealing rubber ring 4 is made of silicone rubber.
[0024] The O-ring 3 is made of EPDM rubber, and the sealing rubber ring 4 is made of silicone rubber. It is resistant to high and low temperatures, aging, has good sealing performance, and is environmentally friendly, making it suitable for a variety of scenarios.
[0025] The inner ring clamp double-sealed pipe fitting 1 is made of stainless steel, and the outer ring clamp double-sealed pipe fitting 2 is also made of stainless steel.
[0026] The inner ring clamp double-sealed pipe fitting 1 and the outer ring clamp double-sealed pipe fitting 2 are made of stainless steel, which gives them corrosion resistance, high strength and impact resistance, ensuring long-term stability and reliability of the connection structure and extending service life.
[0027] Working principle and usage process of this utility model:
[0028] When workers need to connect the inner ring clamp double-seal fitting 1 and the outer ring clamp double-seal fitting 2, they first rotate the inner ring clamp double-seal fitting 1 by external force to connect the external thread 5 and the internal thread 6, which increases tensile strength and sealing performance. Then, using external calipers, they clamp the outer surface sealing ring groove of the outer ring clamp double-seal fitting 2. When the calipers apply pressure to the outer surface sealing ring groove of the outer ring clamp double-seal fitting 2, they will compress the O-ring seal 3, and the compression of the O-ring seal 3 will fill the inner ring clamp double-seal fitting. The gap between fitting 1 and outer ring clamp double-seal fitting 2 will increase the friction between inner ring clamp double-seal fitting 1 and outer ring clamp double-seal fitting 2, thereby increasing the sealing performance of the connection between inner ring clamp double-seal fitting 1 and outer ring clamp double-seal fitting 2. When the caliper applies pressure to the sealing ring groove on the outer surface of outer ring clamp double-seal fitting 2, the sealing rubber ring 4 will fit tightly against the inner wall of the sealing ring groove and the outer surface of inner ring clamp double-seal fitting 1. Through the joint cooperation of sealing rubber ring 4 and O-ring seal 3, the sealing performance of the connection between inner ring clamp double-seal fitting 1 and outer ring clamp double-seal fitting 2 will be increased.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A thin-walled metal pipe connecting pipe fitting structure comprising an inner ring double seal pipe fitting (1), characterized in that: The outer surface of the inner ring double-seal pipe fitting (1) is movably sleeved with an outer ring double-seal pipe fitting (2). The outer left side of the outer surface of the inner ring double-seal pipe fitting (1) is provided with an external thread (5). The inner wall of the outer ring double-seal pipe fitting (2) is provided with an internal thread (6). The inner ring double-seal pipe fitting (1) and the outer ring double-seal pipe fitting (2) are threaded together by the external thread (5) and the internal thread (6). An O-ring (3) and a sealing rubber ring (4) are movably sleeved between the inner ring double-seal pipe fitting (1) and the outer ring double-seal pipe fitting (2).
2. A thin metal tube connecting member structure according to claim 1, characterized by: The inner wall of the outer ring double sealing pipe fitting (2) is provided with a sealing ring groove and a sealing ring groove. The cross section of the O-ring (3) is O-shaped. The O-ring (3) is located inside the sealing ring groove, and the sealing rubber ring (4) is located inside the sealing ring groove.
3. A thin metal tube connecting member structure according to claim 1, wherein: The O-ring (3) is made of EPDM rubber, and the sealing rubber ring (4) is made of silicone rubber.
4. A thin metal tube connecting member structure according to claim 1, wherein: The sealing rubber ring (4) is adapted to the sealing ring groove, and the O-ring (3) is adapted to the sealing ring groove.
5. A thin metal tube connecting member structure according to claim 1, wherein: The inner ring clamp double-sealed pipe fitting (1) is made of stainless steel, and the outer ring clamp double-sealed pipe fitting (2) is made of stainless steel.