Leakproof PVC pipe and fitting connection structure

Abstract

The utility model provides a kind of anti-leakage PVC tubular product pipe fitting connecting structure, including first pipe fitting, the outer side of one end of first pipe fitting is fixedly connected with connecting shell, the one end of connecting shell is inserted with second pipe fitting, the outer side of second pipe fitting is equipped with locking ring groove, the inner wall of connecting shell is evenly equipped with multiple cylindrical grooves, the inner wall of multiple cylindrical grooves is slidably connected with limiting clamping lever. Through set the cooperation structure of trapezoidal locking ring groove and limiting clamping lever, one-way limiting mechanism and conical sleeve shell driving assembly, realize the accurate pre-tightening and axial location of pipe fitting connection, effectively reduce the problem that insertion depth is inconsistent in traditional socket connection, sealing ring compression imbalance, resist axial displacement and external force impact generated by thermal expansion and cold shrink simultaneously, avoid pipe material to come out, give consideration to connection reliability and maintenance flexibility, improve the drawbacks that adhesive type structure cannot be disassembled and maintenance is wasted.

Description

Technical Field

[0001] This utility model relates to the field of pipe fitting connection technology, specifically to a leak-proof PVC pipe fitting connection structure. Background Technology

[0002] PVC pipes are widely used in water supply and drainage, chemical transportation, and other fields due to their advantages such as lightweight, corrosion resistance, and low cost. The reliability of their connection with fittings directly affects the stability of system operation. Currently, the mainstream connection method is the socket structure, which involves inserting the pipe into the fitting socket and using a sealing ring. In some scenarios, adhesive bonding is used for fixation. This structure is easy to process, has high assembly efficiency, and meets basic sealing requirements.

[0003] However, the existing structure has shortcomings: the socket connection lacks an effective axial limiting and pre-tightening mechanism, the insertion depth of the pipe is prone to inconsistency, resulting in an imbalance in the compression of the sealing ring, and the axial displacement caused by thermal expansion and contraction will damage the sealing surface, and external impact may also cause the pipe to come out; while the adhesive structure enhances the connection stability, it cannot be disassembled, and the entire pipe and fittings must be replaced during maintenance, which is not only cumbersome to operate, but also wastes materials, making it difficult to meet the actual needs of flexible maintenance, and the problems of leakage risk and usage cost are prominent. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a leak-proof PVC pipe and fitting connection structure to solve the problems mentioned in the background. This utility model features a novel structure. By incorporating a trapezoidal locking ring groove and a limiting rod, a one-way limiting mechanism, and a conical sleeve drive assembly, it achieves precise pre-tightening and axial limiting of the pipe fitting connection. This effectively reduces the problems of inconsistent insertion depth and unbalanced sealing ring compression in traditional socket connections. Simultaneously, it resists axial displacement and external impacts caused by thermal expansion and contraction, preventing pipe detachment. It balances connection reliability and maintenance flexibility, overcoming the drawbacks of adhesive structures that cannot be disassembled and result in wasted maintenance.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof PVC pipe fitting connection structure, comprising a first pipe fitting, a connecting shell fixedly connected to one end of the first pipe fitting, a second pipe fitting inserted into one end of the connecting shell, a locking ring groove formed on the outer side of the second pipe fitting, a plurality of cylindrical grooves evenly formed on the inner circumference of the connecting shell, a limit rod slidingly fitted on the inner wall of each of the plurality of cylindrical grooves, a first spring sleeved on the outer side of each of the plurality of limit rods, an installation ring fixedly connected to one end of the connecting shell, a plurality of cooperating arc-shaped spring pieces evenly fixedly connected to one side of the installation ring, a cooperating fan-shaped cone block fixedly connected to one end of each of the plurality of arc-shaped spring pieces, a connecting sleeve threadedly fitted to one end of the connecting shell, an annular rotating plate fixedly connected to one end of the connecting sleeve, a conical sleeve rotatably fitted to the other end of the connecting sleeve, an installation groove formed on one side of the annular rotating plate, and a limit mechanism provided inside the installation groove.

[0006] Furthermore, the two ends of the first spring abut against the inner wall of the cylindrical groove and the protrusion of the limiting rod, respectively, and the outer ends of the plurality of limiting rods extend to the outer side of the connecting shell.

[0007] Furthermore, the conical sleeve is slidably fitted on the outside of the connecting shell, and the inner wall of the conical sleeve is slidably abutting against the outer side of the plurality of fan-shaped cones, and the annular rotating plate rotates and is slidably fitted on the connecting shell.

[0008] Furthermore, the limiting mechanism includes a paddle plate that slides into the inner wall of the mounting groove, and the outer end of the paddle plate extends to the outer side of the annular rotating plate. A one-way locking block is fixedly connected to the lower side of the paddle plate, and a second spring is fixedly connected to the upper side of the paddle plate. Multiple locking slots are evenly formed on the outer circumference of one end of the connecting shell.

[0009] Furthermore, the lower end of the one-way locking block is slidably fitted onto the inner wall of the annular rotating plate, the upper end of the second spring is fixedly connected to the upper side of the inner wall of the mounting groove, and the lower end of the one-way locking block is engaged with multiple locking slots.

[0010] Furthermore, each of the multiple fan-shaped cones has its opposite side engaged with the outer end of a corresponding limiting lever.

[0011] Furthermore, a sealing ring is installed on the inner wall of the connecting shell, and a sealing groove that mates with the sealing ring is provided at the insertion end of the second pipe fitting.

[0012] The beneficial effects of this utility model are:

[0013] 1. This utility model achieves precise pre-tightening and axial limiting of pipe fittings by setting a cooperative structure of trapezoidal locking ring groove and limiting rod, unidirectional limiting mechanism and conical sleeve drive assembly. It effectively reduces the problems of inconsistent insertion depth and unbalanced compression of sealing ring in traditional socket connection, while resisting axial displacement and external impact caused by thermal expansion and contraction, preventing pipe from coming out, taking into account connection reliability and maintenance flexibility, and improving the disadvantages of adhesive structure that cannot be disassembled and wastes maintenance.

[0014] 2. This utility model provides a stable and continuous compressive force to the limiting rod by setting a combination of a deformable arc-shaped spring and a fan-shaped cone block, which makes the locking rod and the trapezoidal locking ring groove more tightly engaged, further improving the anti-loosening ability of the connection structure and ensuring long-term stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a leak-proof PVC pipe and fitting connection structure according to the present invention.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the rotating plate of the leak-proof PVC pipe fitting connection structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the limiting mechanism structure of a leak-proof PVC pipe fitting connection structure according to this utility model;

[0018] Figure 4 This is a schematic diagram of the connection shell structure of a leak-proof PVC pipe fitting connection structure according to this utility model;

[0019] Figure 5 This is a schematic diagram of the limiting clamp connection structure of a leak-proof PVC pipe fitting connection structure according to this utility model;

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of the connecting shell of a leak-proof PVC pipe fitting connection structure according to this utility model;

[0021] Figure 7 This is a schematic diagram of the second fitting separation structure of a leak-proof PVC pipe fitting connection structure according to the present invention.

[0022] In the diagram: 1. First fitting; 2. Connecting shell; 3. Second fitting; 4. Locking ring groove; 5. Cylindrical groove; 6. Limiting rod; 7. First spring; 8. Mounting ring; 9. Arc-shaped spring; 10. Fan-shaped cone block; 11. Connecting sleeve; 12. Annular rotating plate; 13. Conical sleeve; 14. Mounting groove; 15. Limiting mechanism; 151. Paddle plate; 152. One-way locking block; 153. Second spring; 154. Locking groove; 16. Sealing ring; 17. Sealing groove. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please refer to Figures 1 to 7 This utility model provides a technical solution: a leak-proof PVC pipe fitting connection structure, including a first pipe fitting 1, a connecting shell 2 fixedly connected to the outer side of one end of the first pipe fitting 1, a second pipe fitting 3 inserted into one end of the connecting shell 2, a locking ring groove 4 opened on the outer side of the second pipe fitting 3, a plurality of cylindrical grooves 5 evenly opened on the inner circumference of the inner wall of the connecting shell 2, a limit rod 6 slidably fitted on the inner wall of the plurality of cylindrical grooves 5, a first spring 7 sleeved on the outer side of the plurality of limit rods 6, an installation ring 8 fixedly connected to one end of the connecting shell 2, a plurality of matching arc-shaped spring pieces 9 evenly fixedly connected on one side of the installation ring 8, a matching fan-shaped cone block 10 fixedly connected to one end of the plurality of arc-shaped spring pieces 9, a connecting sleeve 11 threadedly fitted on the outer side of one end of the connecting shell 2, an annular rotating plate 12 fixedly connected to one end of the connecting sleeve 11, a conical sleeve 13 rotatably fitted to the other end of the connecting sleeve 11, an installation groove 14 opened on one side of the annular rotating plate 12, and a limit mechanism 15 provided inside the installation groove 14. The two ends of the first spring 7 abut against the inner wall of the cylindrical groove 5 and the protrusion of the limiting rod 6, respectively. The outer ends of the multiple limiting rods 6 extend to the outer side of the connecting shell 2. The conical sleeve 13 slides on the outer side of the connecting shell 2, and the inner wall of the conical sleeve 13 slides against the outer side of the multiple fan-shaped cones 10. The annular rotating plate 12 rotates and slides on the connecting shell 2. The second pipe 3 is inserted into the connecting shell 2. The locking ring groove 4 of its outer trapezoidal section corresponds to the position of the cylindrical groove 5. The first spring 7 generates an outward elastic force on the limiting rod 6, causing it to move away from the locking ring groove 4 in its initial state. The connecting sleeve 11 is threadedly engaged with the connecting shell 2. Rotating the annular rotating plate 12 can drive the connecting sleeve 11 to move, thereby pushing the conical sleeve 13 to slide along the outer side of the connecting shell 2, providing power for the subsequent pressing of the limiting rods 6 by the fan-shaped cones 10, ensuring accurate docking guidance, and paving the way for the locking action.

[0025] In this embodiment, the limiting mechanism 15 includes a paddle plate 151 that slides on the inner wall of the mounting groove 14, with the outer end of the paddle plate 151 extending to the outer side of the annular rotating plate 12. A one-way locking block 152 is fixedly connected to the lower side of the paddle plate 151, and a second spring 153 is fixedly connected to the upper side of the paddle plate 151. Multiple slots 154 are evenly formed on the outer circumference of one end of the connecting shell 2. The lower end of the one-way locking block 152 slides on the inner wall of the annular rotating plate 12, the upper end of the second spring 153 is fixedly connected to the upper side of the inner wall of the mounting groove 14, and the lower end of the one-way locking block 152 engages with the multiple slots 154. In the limiting mechanism 15, the paddle plate 151 slides along the inner wall of the mounting groove 14, and the second spring 153 provides a downward elastic force to the one-way locking block 152, so that its lower end engages with the locking groove 154 of the connecting shell 2. The one-way locking block 152 only allows the annular rotating plate 12 to drive the connecting sleeve 11 to rotate and move in the locking direction, effectively preventing reverse loosening after connection. When unlocking, pulling up the paddle plate 151 can compress the second spring 153, so that the one-way locking block 152 disengages from the locking groove 154, and the limiting is released for easy disassembly, taking into account both connection stability and ease of disassembly and assembly. When the conical sleeve 13 slides, its inner wall squeezes multiple fan-shaped cones 10, causing the arc-shaped spring 9 to deform. The fan-shaped cones 10 simultaneously squeeze the outer end of the limiting rod 6 on the opposite side, causing it to overcome the resistance of the first spring 7 and move inward, eventually engaging with the trapezoidal locking ring groove 4 of the second pipe 3. The trapezoidal cross-section design further enhances the clamping force and improves the connection stability as the limiting rod 6 squeezes.

[0026] In this embodiment, the opposite sides of the multiple fan-shaped cones 10 are engaged with the outer ends of the corresponding limiting rods 6. A sealing ring 16 is installed on the inner wall of the connecting shell 2, and a sealing groove 17 that mates with the sealing ring 16 is provided at the insertion end of the second pipe fitting 3. The sealing ring 16 on the inner wall of the connecting shell 2 and the sealing groove 17 of the second pipe fitting 3 fit precisely to form an effective seal, achieving the dual effects of preventing leakage and strengthening the connection.

[0027] When using the device, insert the second pipe 3 into the connecting shell 2. The sealing ring 16 is embedded in the sealing groove 17 for initial sealing. At this time, the limiting rod 6 moves away from the trapezoidal locking ring groove 4 under the action of the first spring 7. Rotate the annular rotating plate 12 to drive the connecting sleeve 11 to move along the thread of the connecting shell 2 in the locking direction. Push the conical sleeve 13 to squeeze the fan-shaped cone block 10. After the arc-shaped spring 9 is deformed, it drives the limiting rod 6 to overcome the spring resistance and enter the trapezoidal locking ring groove 4. The one-way locking block 152 and the locking groove 154 are engaged to prevent loosening.

[0028] When unlocking, pull up the lever plate 151 to disengage the one-way locking block 152 from the slot 154, rotate the annular rotating plate 12 in the opposite direction to drive the conical sleeve 13 to reset, and the limit locking rod 6 exits the locking ring groove 4 under the action of the first spring 7, so that the second pipe 3 can be pulled out. The whole process takes into account stability, leakage prevention and convenient disassembly and assembly.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A leak-proof PVC pipe fitting connection structure, comprising a first fitting (1), characterized in that: A connecting shell (2) is fixedly connected to one end of the first pipe fitting (1). A second pipe fitting (3) is inserted into one end of the connecting shell (2). A locking ring groove (4) is provided on the outer side of the second pipe fitting (3). A plurality of cylindrical grooves (5) are evenly provided on the inner circumference of the connecting shell (2). The inner walls of the plurality of cylindrical grooves (5) are slidably fitted with limit rods (6). A first spring (7) is sleeved on the outer side of the plurality of limit rods (6). An installation ring (8) is fixedly connected to one end of the connecting shell (2). One side of the installation ring (8) Multiple matching arc-shaped spring pieces (9) are uniformly fixedly connected around the circumference. One end of each of the multiple arc-shaped spring pieces (9) is fixedly connected to a matching fan-shaped cone block (10). A connecting sleeve (11) is threaded onto the outer side of one end of the connecting shell (2). An annular rotating plate (12) is fixedly connected to one end of the connecting sleeve (11). A conical sleeve (13) is rotatably connected to the other end of the connecting sleeve (11). An installation groove (14) is provided on one side of the annular rotating plate (12). A limit mechanism (15) is provided inside the installation groove (14).

2. The leak-proof PVC pipe fitting connection structure according to claim 1, characterized in that: The two ends of the first spring (7) abut against the inner wall of the cylindrical groove (5) and the protrusion of the limiting rod (6), respectively, and the outer ends of the multiple limiting rods (6) extend to the outside of the connecting shell (2).

3. The leak-proof PVC pipe fitting connection structure according to claim 1, characterized in that: The conical sleeve (13) is slidably fitted on the outside of the connecting shell (2), and the inner wall of the conical sleeve (13) is slidably abutting against the outside of the multiple fan-shaped cones (10). The annular rotating plate (12) rotates and is slidably fitted on the connecting shell (2).

4. The leak-proof PVC pipe fitting connection structure according to claim 1, characterized in that: The limiting mechanism (15) includes a paddle plate (151) that slides on the inner wall of the mounting groove (14), and the outer end of the paddle plate (151) extends to the outer side of the annular rotating plate (12). A one-way locking block (152) is fixedly connected to the lower side of the paddle plate (151), and a second spring (153) is fixedly connected to the upper side of the paddle plate (151). Multiple locking slots (154) are evenly opened on the outer circumference of one end of the connecting shell (2).

5. The leak-proof PVC pipe fitting connection structure according to claim 4, characterized in that: The lower end of the one-way block (152) is slidably fitted on the inner wall of the annular rotating plate (12), the upper end of the second spring (153) is fixedly connected to the upper side of the inner wall of the mounting groove (14), and the lower end of the one-way block (152) is engaged with multiple slots (154).

6. The anti-leakage PVC pipe fitting connection structure according to claim 1, characterized in that: Each of the multiple fan-shaped cones (10) has its opposite side engaged with the outer end of the corresponding limiting lever (6).

7. The leak-proof PVC pipe fitting connection structure according to claim 1, characterized in that: The inner wall of the connecting shell (2) is equipped with a sealing ring (16), and the insertion end of the second pipe (3) is provided with a sealing groove (17) that matches the sealing ring (16).

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