A quick connect fitting for a natural gas delivery pipe
Patent Information
- Application Number
- CN202522639841.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-12-11
AI Technical Summary
[0003]在当前天然气输送管道快速连接接头的设计中，为提升管道连接后的稳定性，多数产品会配套设置夹持机构，通过对连接后的管道施加夹持力，起到辅助固定的作用，避免管道在天然气输送过程中因振动、压力波动出现松动或偏移，但现有夹持机构普遍存在设计缺陷：其与接头本体多为一体化固定结构(如焊接、不可拆卸式卡扣连接)，无法单独拆分，当夹持机构因长期受力出现部件磨损、变形，或防滑层老化失效需要更换时，由于无法将损坏的夹持机构单独卸下，工作人员只能将整个快速连接接头一同更换，这种“整体更换”的方式不仅会造成接头本体的浪费(多数情况下本体仍具备正常使用功能)，还需额外采购全新接头，同时延长了管道停运检修时间，最终导致设备维护成本显著增加，难以适配高效、经济的管网运维需求
[0014]与现有技术相比，本实用新型提供了一种天然气输送管道快速连接接头，具备以下有益效果：
Smart Images
Figure CN224872085U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil and gas engineering construction technology, specifically a quick-connect coupling for natural gas transmission pipelines. Background Technology
[0002] As is well known, a quick-connect fitting for natural gas pipelines is a detachable connector used in natural gas (including domestic, industrial, and municipal pipeline systems) transmission pipeline systems to quickly achieve sealed connections between pipelines and between pipelines and equipment (such as valves, pressure gauges, and gas meters).
[0003] In the current design of quick-connect fittings for natural gas transmission pipelines, most products are equipped with clamping mechanisms to improve the stability of the pipeline after connection. These mechanisms apply clamping force to the connected pipeline, providing auxiliary fixation and preventing loosening or displacement of the pipeline due to vibration or pressure fluctuations during natural gas transmission. However, existing clamping mechanisms generally have design flaws: they are mostly integrated with the fitting body (such as welded or non-removable snap-fit connections) and cannot be separated. When the clamping mechanism suffers wear and deformation due to long-term stress, or when the anti-slip layer ages and fails, requiring replacement, the damaged clamping mechanism cannot be removed separately. Workers must replace the entire quick-connect fitting together. This "whole replacement" method not only wastes the fitting body (which in most cases still has normal functionality) but also requires the purchase of a brand new fitting, while extending pipeline downtime for maintenance. Ultimately, this leads to a significant increase in equipment maintenance costs, making it difficult to meet the needs of efficient and economical pipeline network operation and maintenance. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this utility model provides a quick-connect fitting for natural gas transmission pipelines.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: a quick-connect coupling for natural gas transmission pipelines, comprising a body, a clamping mechanism, and a limiting mechanism. The clamping mechanism has two sets, each including a ring, a connecting plate, a threaded rod, a bearing, a clamping plate, and a limiting rod. The ring is fitted onto the outer wall of the body. One end of the limiting rod is connected to the ring, and the other end passes through the body. One end of the connecting plate is connected to the ring, and the threaded rod is threadedly connected to the connecting plate. The clamping plate is connected to the threaded rod via the bearing. The limiting mechanism includes a first limiting plate, a second limiting plate, a long block, and a bolt. The inner walls of the first and second limiting plates extend into the body. One end of the long block is connected to the second limiting plate, and the other end extends into the first limiting plate. The first limiting plate has a groove matching the long block. The bolt threadedly connects the first limiting plate and the long block. The limiting mechanism has two sets.
[0008] To improve the corrosion resistance, the present invention is improved by providing an anti-corrosion layer on the outer wall of the main body, and the anti-corrosion layer is fixedly connected to the outer wall of the main body.
[0009] To improve stability, this utility model is improved by symmetrically arranging the two sets of clamping mechanisms and the two sets of limiting mechanisms.
[0010] To improve the anti-slip effect, the present invention is improved by providing an anti-slip layer on the inner wall of the clamping plate, and the anti-slip layer is provided with a number of anti-slip patterns.
[0011] To improve the anti-slip effect, the present invention is improved by using a rubber material for the anti-slip layer.
[0012] To improve the strength of the bolt and the threaded rod, this utility model is improved by making both the bolt and the threaded rod stainless steel.
[0013] (III) Beneficial Effects
[0014] Compared with the prior art, this utility model provides a quick connection joint for natural gas transmission pipelines, which has the following advantages:
[0015] This quick-connect fitting for natural gas pipelines features two symmetrically arranged clamping mechanisms and two limiting mechanisms. These mechanisms apply clamping force and constraint evenly from both sides of the pipeline, preventing loosening or misalignment caused by unilateral force. The anti-slip layer and textured surface of the inner wall of the clamping plate allow for elastic deformation to conform to the pipeline and increase friction, effectively preventing pipeline vibration and slippage, further enhancing connection stability. The corrosion-resistant layer fixed to the outer wall of the fitting body blocks erosion from humid and corrosive environments, extending the fitting's service life. The stainless steel bolts and threaded rods combine high strength and corrosion resistance, preventing deformation or rust failure under stress and ensuring long-term stable operation. Crucially, the clamping mechanism and the fitting body are detachably connected via the limiting mechanisms. When the clamping mechanism is damaged, the entire fitting does not need to be replaced; only the limiting mechanisms need to be disassembled for individual replacement, significantly reducing material waste and maintenance costs, thus meeting the needs of efficient and economical natural gas pipeline operation and maintenance. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 This utility model Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;
[0018] Figure 3 This is a schematic diagram of the axial structure of this utility model;
[0019] Figure 4 This utility model Figure 1 The front view;
[0020] In the diagram: 1. Body; 2. Clamping mechanism; 3. Ring; 4. Connecting plate; 5. Threaded rod; 6. Bearing; 7. Clamping plate; 8. Limiting mechanism; 9. First limiting plate; 10. Second limiting plate; 11. Long block; 12. Bolt; 13. Limiting rod. Detailed Implementation
[0021] 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.
[0022] Please see Figure 1-4A quick-connect coupling for a natural gas pipeline includes a body 1, a clamping mechanism 2, and a limiting mechanism 8. The clamping mechanism 2 has two sets and includes a ring 3, a connecting plate 4, a threaded rod 5, a bearing 6, a clamping plate 7, and a limiting rod 13. The ring 3 is fitted onto the outer wall of the body 1. One end of the limiting rod 13 is connected to the ring 3, and the other end passes through the body 1. One end of the connecting plate 4 is connected to the ring 3, and the threaded rod 5 is threadedly connected to the connecting plate 4. The clamping plate 7 is connected via the... The bearing 6 is connected to the threaded rod 5. The limiting mechanism 8 includes a first limiting plate 9, a second limiting plate 10, a long block 11, and a bolt 12. The inner walls of the first limiting plate 9 and the second limiting plate 10 extend into the body 1, respectively. One end of the long block 11 is connected to the second limiting plate 10, and the other end of the long block 11 extends into the first limiting plate 9. The first limiting plate 9 has a groove that matches the long block 11. The bolt 12 is threadedly connected to the first limiting plate 9 and the long block 11. The limiting mechanism 8 has two sets.
[0023] Working principle
[0024] The body 1 of this connector is a conventional quick-connect connector for natural gas transmission pipelines on the market. Its internal sealing structure, medium flow channel and other core components and basic connection principle are well known to those skilled in the art, and will not be described in detail here.
[0025] When this connector is needed to connect pipes, the operating procedure is as follows: The operator should first refer to... Figure 1 The external pipe to be connected is initially connected to the main body 1 via threads to ensure a precise fit between the pipe and the main body 1 interface. To further improve the connection stability and prevent the pipe from loosening due to vibration during natural gas transportation, the clamping mechanism 2 is activated for auxiliary fixation. The staff holds the clamping plate 7, which matches the specifications of the external pipe, and then turns the threaded rod 5, which is threaded to the connecting plate 4, clockwise. The threaded rod 5 pushes the bearing 6 under the action of the threads, thereby driving the clamping plate 7 to move towards the pipe until the inner wall of the clamping plate 7 tightly abuts against the outer wall of the pipe, firmly locking the pipe and completing the auxiliary fixation, which significantly improves the connection reliability between the pipe and the main body 1.
[0026] When the clamping mechanism 2 suffers from wear, breakage, or other damage after long-term use and needs to be replaced separately, the disassembly steps are as follows: First, the operator uses an external screwdriver to unscrew the bolts 12 of the limiting mechanism 8 counterclockwise to release the fixed constraint between the first limiting plate 9 and the long block 11; then, pull the first limiting plate 9 and the second limiting plate 10 to both sides to completely disengage the long block 11 from the groove of the first limiting plate 9, and at the same time, separate the parts of both extending into the body 1 from the body 1 to disassemble the limiting mechanism 8; finally, grasp the ring 3 and pull it outward to slide the ring 3 along the outer wall of the body 1, simultaneously pulling the limiting rod 13 out of the body 1, thus completely separating the entire clamping mechanism 2 from the body 1. When replacing, simply purchase a new clamping mechanism 2 of the same specifications and reverse the above steps to complete the installation. Subsequent installation details are routine operations for those skilled in the art and will not be described in detail here.
[0027] To further enhance the durability of the quick-connect joint for natural gas pipelines in complex environments and prevent structural damage or sealing failure of the main body 1 due to external corrosion, this embodiment adds an anti-corrosion layer to the outer wall of the main body 1 and adopts a fixed connection method to ensure that the anti-corrosion layer is tightly fitted to the outer wall of the main body 1 without gaps. Natural gas pipeline joints are often exposed to outdoor humid environments, underground soil corrosion environments, or corrosive gas environments in industrial areas. The anti-corrosion layer can effectively block the contact between moisture, soil electrolytes, corrosive gases and the metal surface of the main body 1, preventing problems such as rust and oxidation of the main body 1. At the same time, the fixed connection design can prevent the anti-corrosion layer from falling off due to vibration and friction during long-term use, ensuring the long-lasting and stable anti-corrosion effect, extending the overall service life of the joint, ensuring the structural safety and sealing of the natural gas transmission process, and adapting to various harsh application scenarios such as outdoor and underground environments.
[0028] To further improve the overall connection stability and force balance of the quick-connect joint for natural gas transmission pipelines, and to avoid displacement or loosening due to unilateral force during pipeline connection or disassembly of the clamping mechanism 2, this embodiment symmetrically arranges two sets of clamping mechanisms 2 and two sets of limiting mechanisms 8 along the center line of the main body 1. When the symmetrically arranged clamping mechanism 2 assists in fixing the external pipeline, it can apply clamping force from both sides of the pipeline simultaneously, ensuring uniform force on the pipeline and avoiding deformation caused by excessive clamping on one side or vibration and displacement caused by excessive looseness. The symmetrically distributed limiting mechanisms 8 can form balanced constraints from both sides of the main body 1 when fixing the clamping mechanism 2, preventing the clamping mechanism 2 from tilting due to unilateral limiting failure. At the same time, simultaneous unlocking on both sides during disassembly makes operation easier, ensuring a smooth disassembly and assembly process for the clamping mechanism 2, and providing dual support for stable connection and convenient maintenance of the joint.
[0029] To further enhance the stable clamping effect of the clamping plate 7 on the external pipeline and prevent the pipeline from sliding due to vibration during natural gas transportation, thus affecting the sealing performance of the joint, this embodiment adds an anti-slip layer to the inner wall of the clamping plate 7 and processes several anti-slip patterns on the surface of the anti-slip layer. When the clamping plate 7 is driven by the threaded rod 5 to press against the outer wall of the pipeline, the anti-slip layer can fit tightly against the pipeline surface, and its own material friction characteristics can initially increase the contact friction. The anti-slip patterns further enhance the anti-slip effect by increasing the roughness of the contact surface, effectively dispersing the lateral force generated by pipeline vibration and preventing relative sliding between the pipeline and the clamping plate 7. This dual design of "anti-slip layer + anti-slip patterns" can ensure that the clamping plate 7 can stably clamp pipelines of different diameters and different surface conditions, providing a guarantee for the overall reliability of the joint connection.
[0030] To further enhance the anti-slip clamping effect of the clamping plate 7 and ensure the stability of the external pipeline during natural gas transportation, thus preventing the joint sealing from being affected by pipeline slippage, this embodiment specifically uses rubber material to make the anti-slip layer on the inner wall of the clamping plate 7. Rubber material has excellent elasticity and friction characteristics. When the clamping plate 7 is pressed against the outer wall of the pipeline, the rubber anti-slip layer will undergo slight deformation due to compression, closely adhering to the pipeline surface. Even if there are minor bumps or defects on the outer wall of the pipeline, the deformation can fill the gaps and increase the contact area. At the same time, the high coefficient of friction of the rubber material itself can effectively prevent relative sliding between the pipeline and the clamping plate 7. Especially when dealing with pipeline vibration or minor external impact, it can further reduce the risk of slippage through its own elastic buffering force, providing a reliable guarantee for the stable connection between the pipeline and the joint.
[0031] To further ensure the structural strength and durability of bolt 12 and threaded rod 5 during long-term use of the joint, and to prevent deformation or corrosion failure from affecting the stability of clamping mechanism 2 and limiting mechanism 8, both bolt 12 and threaded rod 5 are made of stainless steel in this embodiment. Bolt 12 needs to withstand the fixing constraint force of limiting mechanism 8, while threaded rod 5 needs to drive clamping plate 7 to generate clamping force during tightening. Both need to have sufficient tensile and shear strength, and the mechanical properties of stainless steel can meet this requirement, effectively resisting deformation or fracture caused by long-term stress. At the same time, natural gas transmission joints are often exposed to humid and corrosive environments. The corrosion resistance of stainless steel can prevent bolt 12 and threaded rod 5 from rusting, avoiding jamming, disassembly difficulties, or strength reduction caused by rust, ensuring that both maintain stable connection and adjustment functions for a long time, and providing support for the safe use and convenient maintenance of the joint.
[0032] 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 quick-connect fitting for a natural gas transmission pipeline, comprising a body (1), a clamping mechanism (2), and a limiting mechanism (8), characterized in that: The clamping mechanism (2) has two sets. The clamping mechanism (2) includes a ring (3), a connecting plate (4), a threaded rod (5), a bearing (6), a clamping plate (7), and a limiting rod (13). The ring (3) is fitted onto the outer wall of the body (1). One end of the limiting rod (13) is connected to the ring (3), and the other end of the limiting rod (13) passes through the body (1). One end of the connecting plate (4) is connected to the ring (3). The threaded rod (5) is threadedly connected to the connecting plate (4). The clamping plate (7) is connected to the threaded rod (5) through the bearing (6). The limiting mechanism (8) includes a first limiting plate (9), a second limiting plate (10), a long block (11), and a bolt (12). The inner walls of the first limiting plate (9) and the second limiting plate (10) extend into the body (1), respectively. One end of the long block (11) is connected to the second limiting plate (10), and the other end of the long block (11) extends into the first limiting plate (9). The first limiting plate (9) has a groove that matches the long block (11). The bolt (12) is threadedly connected to the first limiting plate (9) and the long block (11). The limiting mechanism (8) has two sets.
2. The quick-connect fitting for a natural gas transmission pipeline according to claim 1, characterized in that: The outer wall of the body (1) is provided with an anti-corrosion layer, which is fixedly connected to the outer wall of the body (1).
3. A quick-connect fitting for a natural gas transmission pipeline according to claim 2, characterized in that: The two sets of clamping mechanisms (2) are symmetrically arranged, and the two sets of limiting mechanisms (8) are symmetrically arranged.
4. A quick-connect fitting for a natural gas transmission pipeline according to claim 3, characterized in that: The inner wall of the clamping plate (7) is provided with an anti-slip layer, and the anti-slip layer is provided with several anti-slip patterns.
5. A quick-connect fitting for a natural gas transmission pipeline according to claim 4, characterized in that: The anti-slip layer is made of rubber.
6. A quick-connect fitting for a natural gas transmission pipeline according to claim 5, characterized in that: Both the bolt (12) and the threaded rod (5) are made of stainless steel.