Clamping and pressing type leakage-proof pipeline connecting structure

Abstract

The utility model discloses a clamping and pressing type leakproof pipeline connecting structure, which belongs to the technical field of pipeline sealing and is characterized by comprising a clamping and pressing pipe, a connecting pipe and a sealing ring, at least one end of the clamping and pressing pipe is provided with a bell mouth, the inner wall of the bell mouth is provided with a U-shaped groove, a bulge is formed on the outer wall of the clamping and pressing pipe, and the sealing ring is elastic and is arranged in the U-shaped groove. The connecting pipe is inserted into the bell mouth; the sealing ring is provided with a long arc section and a short arc section which are connected into a ring, the short arc section is provided with a first fulcrum, a second fulcrum and an arc-shaped groove, the first fulcrum and the second fulcrum can abut against the outer wall of the connecting pipe, a first ventilation gap is formed between the arc-shaped groove and the connecting pipe, the bulge deforms after being clamped and pressed, and the U-shaped groove extrudes the sealing ring. The inner side surfaces of the long arc section and the short arc section are tightly attached to the outer wall of the connecting pipe, and sealing is achieved. Before the clamping and pressing pipe is clamped and pressed, the leakage condition at the position of the sealing ring can be known through pressure test detection, and the sealing quality between the clamping and pressing pipe and the connecting pipe can be guaranteed after clamping and pressing.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline sealing, and in particular relates to a compression-type leak-proof pipeline connection structure. Background Art

[0002] Compression fittings work by inserting a thin-walled metal connecting pipe into the end of a compression tube. A compression tool then secures the connecting pipe to the compression tube, ensuring a secure connection. A sealing ring seals the connecting pipe and compression tube, making them leak-proof, pull-out-resistant, vibration-resistant, and resistant to high pressure. Compression fittings not only simplify the complexity of traditional pipe connections but also improve connection efficiency and durability. They are primarily used in water, oil, and gas pipeline systems.

[0003] For example, Chinese patent publication number CN2753939Y discloses a compression-type pipe fitting comprising a pipe body and an O-ring. The pipe body has at least one socket at its end, with an outwardly protruding, annular, trapezoidal groove circumferentially defined at the outer end of the socket. The O-ring fits within the groove. During installation, the connecting pipe is inserted into the socket, and a specialized clamp is used to simultaneously compress the trapezoidal groove and the outer portion of the pipe body. This causes the groove to shrink and compress the ring against the outer wall of the connecting pipe. This simultaneously compresses the groove and the pipe body, deforming the groove and the fitting body to secure the pipe in place.

[0004] Regarding specialized clamps, Chinese patent publication number CN106151707A discloses a method and specialized clamp for connecting pipes. The clamp comprises a handle section and a jaw section, each with a trapezoidal notch in its cross-section. When clamped, the jaw section axially clamps the annular groove, permanently deforming it and forcing the sealing ring to press against the outer wall of the first pipe. This seals the gap between the first and second pipes, effectively clamping the first and second pipes together.

[0005] After the pipe body and the connecting pipe of the above-mentioned compression-type pipe fitting are plugged in, the gap between the pipe body and the connecting pipe is directly sealed by the O-ring. In large-scale pipeline projects, the number of pipe fittings that need to be compressed and connected is large, the workload is large, and the appearance of the pipe body before and after compression is small. Workers are prone to miss the compression operation of some pipe bodies and connecting pipes. Due to the presence of the O-ring, even if there is no compression operation, there is a certain degree of sealing, and there will be no water leakage in the short term. During the pressure test operation, the missed compression position cannot be discovered in time and remedied, but it will leak during later use, causing significant economic losses. In addition, substandard compression operation will also reduce the airtightness of the connection between the pipe body and the connecting pipe. During the pressure test, it is also difficult to accurately find the unqualified pipeline connection position. The existing sealing ring is difficult to find the leakage position during the pressure test. Utility Model Content

[0006] The purpose of the present invention is to solve the above problems in the prior art and to propose a compression-type leak-proof pipe connection structure. The technical problem to be solved by the present invention is: how to determine whether the compression pipe and the connecting pipe are completely sealed during the pressure test operation.

[0007] The above technical objectives of the present invention can be achieved through the following technical solutions:

[0008] The cam is provided with a U-shaped groove, and the cam is provided with a sealing ring, wherein the sealing ring has elasticity and is arranged in the U-shaped groove, and the connecting pipe is inserted into the socket; wherein the sealing ring has a long arc segment and a short arc segment connected to form a ring, and the long arc segment and the short arc segment are each provided with at least one, and a fulcrum 1 and a fulcrum 2 are formed at both ends of the short arc segment, and the inner surface of the short arc segment has an arc groove, the fulcrum 1 and the fulcrum 2 can abut against the outer wall of the connecting pipe, and a ventilation gap 1 is formed between the arc groove and the connecting pipe, the bulge is deformed after being pressed, and the U-shaped groove squeezes the sealing ring, so that the inner surfaces of the long arc segment and the short arc segment are both close to the outer wall of the connecting pipe, thereby sealing the gap between the connecting pipe and the compression pipe.

[0009] Through the above technical solution, the U-shaped groove limits the sealing ring, and after the connecting pipe is inserted into the socket, the first and second fulcrums abut against the outer wall of the connecting pipe. After the clamp is used to clamp the clamp, the outer wall and bulge of the clamp are permanently deformed, and the sealing ring is squeezed and deformed by the U-shaped groove. The ventilation gap disappears, so that the inner sides of the long arc segment and the short arc segment are both tightly attached to the outer wall of the connecting pipe. Before the clamp is clamped, the ventilation gap between the arc groove and the connecting pipe is maintained, that is, the arc groove of the short arc segment does not abut against the outer wall of the connecting pipe. At this time, the sealing ring does not completely seal the gap between the connecting pipe and the clamp. When the clamp or connecting pipe is pressurized or tested with water, if a leak occurs in the ventilation gap, it can be determined whether the clamp has been clamped and whether the clamp and connecting pipe are completely sealed. Before the pipeline is put into use, the leaking location can be repaired and remedial repairs can be performed to eliminate hidden dangers.

[0010] In the aforementioned compression-type leak-proof pipe connection structure, the radius of the long arc segment is R1, and the radius of the short arc segment is R2, where R1>R2. The radius of the long arc segment is greater than the radius of the short arc segment, that is, the curvature of the long arc segment is less than that of the short arc segment, making the transition between the long and short arc segments smoother and ensuring the appearance of the arc groove.

[0011] In the aforementioned compression-type leak-proof pipe connection structure, the outer side of the short arc segment has an outwardly convex protrusion, which abuts against the U-shaped groove, creating a gap between the outer wall of the long arc segment and the U-shaped groove. The protrusion abuts against the groove wall of the U-shaped groove, creating a gap between the outer wall of the long arc segment and the U-shaped groove. This gap provides deformation space for the sealing ring, allowing the sealing ring to maintain its elastic deformation properties.

[0012] In the aforementioned compression-type leak-proof pipe connection structure, both fulcrums 1 and 2 are located near the inner side of the short arc segment. They are symmetrically arranged, with fulcrum 1 having a first rounded corner and fulcrum 2 having a second rounded corner. Fulcrum 1 abuts against the connecting pipe via the first rounded corner, while fulcrum 2 abuts against the connecting pipe via the second rounded corner. This reduces the contact area between fulcrums 1 and 2 and the outer wall of the connecting pipe, thereby reducing the sliding friction between the sealing ring and the outer wall of the connecting pipe during deformation, ensuring that the long and short arc segments can easily deform and adhere closely to the connecting pipe.

[0013] In the aforementioned compression-type leak-proof pipe connection structure, the first and second fulcrums abut against the outer wall of the connecting pipe, and a second ventilation gap is maintained between the long arc segment and the connecting pipe. The combination of the first and second ventilation gaps ensures sufficient clearance for test gas or fluid to pass through when the compression pipe is not being compressed, thereby improving the accuracy of the pressure test.

[0014] In the aforementioned compression-type leak-proof pipe connection structure, the long and short arc segments both have circular cross-sections and are integrally formed with the short arc segments. The long and short arc segments are integrally formed to form an annular sealing ring, and the transition between the long and short arc segments is smooth.

[0015] In the aforementioned compression-type leak-proof pipe connection structure, at least three long arc segments and at least three short arc segments are provided, and the long arc segments and short arc segments are spaced apart. The provision of multiple short arc segments and long arc segments increases the number of ventilation gaps, further improving the pressure test performance of the sealing ring. Furthermore, the deformation amplitude of the sealing ring is more uniform across the entire area, thereby improving the sealing performance of the sealing ring.

[0016] In the above-mentioned compression-type leak-proof pipe connection structure, the long arc segment and the short arc segment have the same thickness. The upper end face and the lower end face of the sealing ring are at the same level, and the overall deformation of the sealing ring will not affect the sealing performance of the sealing ring.

[0017] In the aforementioned compression-type leak-proof pipe connection structure, the socket is provided with latching teeth positioned adjacent to the U-shaped groove. When the compression tube is compressed, the latching teeth deform, causing them to grip the outer wall of the connecting tube. Once the compression tube is clamped, the clamping tube causes the latching teeth to permanently deform, causing them to grip the outer wall of the connecting tube, improving the connection quality between the compression tube and the connecting tube.

[0018] In the aforementioned compression-type leak-proof pipe connection structure, a groove is provided on the outer wall of the connecting pipe, adjacent to the U-shaped groove. When the sealing ring deforms, the inner surfaces of the long and short arc segments are compressed within the groove. The contact between the sealing ring and the connecting pipe via the groove further increases the contact area between the sealing ring and the connecting pipe, thereby enhancing the sealing effect.

[0019] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0020] After the connecting pipe is inserted into the socket, the arc groove and the surface of the long arc segment do not fit the outer wall of the connecting pipe, and the ventilation gap 1 and ventilation gap 2 are both maintained. At this time, the sealing ring does not seal the gap between the connecting pipe and the compression pipe. When the compression pipe or the connecting pipe is pressurized or water-tested, leakage occurs at the ventilation gap 1 and ventilation gap 2, which can be used to determine whether the compression pipe has been clamped by the clamp and whether the compression pipe and the connecting pipe are completely sealed by the sealing ring. Before the pipeline is put into use, the location of the leak can be repaired and remedial repairs can be performed to eliminate hidden dangers. The utility model has the advantages of accurate and convenient detection during installation and reliable construction quality. Moreover, after the compression pipe is clamped by the clamp, the outer wall and bulge of the compression pipe are permanently deformed, and the sealing ring is squeezed and deformed by the U-shaped groove, so that the inner surface of the long arc segment and the short arc segment are both in contact with the outer wall of the connecting pipe, and the ventilation gap 1 and ventilation gap 2 disappear. At this time, the sealing ring completely seals the gap between the connecting pipe and the compression pipe. The sealing ring can detect leakage at the sealing ring through pressure test before the compression tube is compressed, and can also ensure the sealing quality between the compression tube and the connecting pipe after compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the explosion structure of the embodiment;

[0022] Figure 2 for Figure 1 A cross-sectional schematic diagram;

[0023] Figure 3 Schematic diagram of the structure of the sealing ring;

[0024] Figure 4 for Figure 3 One of the cross-sectional diagrams;

[0025] Figure 5 for Figure 3 The second cross-sectional diagram;

[0026] Figure 6 for Figure 1 Schematic diagram of the assembly structure;

[0027] Figure 7 is another cross-sectional schematic diagram of an embodiment;

[0028] Figure 8 Schematic diagram of the assembly structure of the embodiment;

[0029] Figure 9 Schematic diagram of the structure of the connecting pipe;

[0030] Figure 10 Schematic diagram of the assembly structure of the embodiment;

[0031] Figure 11 Schematic diagram of the external structure of the embodiment;

[0032] Figure 12 for Figure 11 Schematic cross-sectional view of .

[0033] Reference numerals: 100, compression tube; 110, socket; 111, U-shaped groove; 112, latching teeth; 120, bulge; 130, joint;

[0034] 200, connecting pipe; 210, card slot;

[0035] 300, sealing ring; 310, long arc segment; 320, short arc segment; 321, fulcrum 1; 3211, fillet 1; 322, fulcrum 2; 3221, fillet 2; 323, arc groove; 324, ridge;

[0036] 400, ventilation gap one; 500, ventilation gap two; 600, gap. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0038] A compression-type leak-proof pipe connection structure, such as Figures 1 to 12As shown, it includes a compression tube 100, a connecting tube 200, and a sealing ring 300. The compression tube 100 has a socket 110 at at least one end, and the inner wall of the socket 110 has a U-shaped groove 111. The outer wall of the compression tube 100 is formed with a bulge 120 near the U-shaped groove 111. The sealing ring 300 is elastic and is arranged in the U-shaped groove 111. The connecting tube 200 is inserted into the socket 110; wherein the sealing ring 300 has a long arc segment 310 and a short arc segment 320 connected in a ring shape, and each of the long arc segment 310 and the short arc segment 320 is provided with at least one, and the two ends of the short arc segment 320 A fulcrum 1 321 and a fulcrum 2 322 are formed at the end, and the inner surface of the middle part of the short arc segment 320 has an arc groove 323. The fulcrum 1 321 and the fulcrum 2 322 can abut against the outer wall of the connecting tube 200, and a ventilation gap 1 400 is formed between the arc groove 323 and the connecting tube 200. The bulge 120 is permanently deformed after being clamped by the clamp, and the U-shaped groove 111 will squeeze the sealing ring 300, so that the inner surfaces of the long arc segment 310 and the short arc segment 320 are both close to the outer wall of the connecting tube 200, thereby sealing the gap between the connecting tube 200 and the clamping tube 100.

[0039] like Figures 1 to 8 As shown, the cross-sectional shapes of the long arc segment 310 and the short arc segment 320 are both circular, and the thickness of the long arc segment 310 and the short arc segment 320 are the same. In other words, the upper surfaces of the long arc segment 310 and the short arc segment 320 are at the same horizontal height, and the lower surfaces of the long arc segment 310 and the short arc segment 320 are also at the same horizontal height.

[0040] The radius of the long arc segment 310 is R1, and the radius of the short arc segment 320 is R2, where R1>R2. According to the principle that smaller circles have greater curvature, and larger circles have less curvature, in this embodiment, the curvature of the arc length of the long arc segment 310 is smaller than that of the arc length of the short arc segment 320. This allows the arc groove 323 to be naturally formed between the first fulcrum 321 and the second fulcrum 322. Furthermore, the arc groove 323 is smoother, and the connection between the long arc segment 310 and the short arc segment 320 is smoother, thus preventing the arc groove 323 from being misaligned with the outer wall of the connecting tube 200.

[0041] The outer side of the short arc segment 320 has an outwardly protruding protrusion 324, which is used to abut against the side wall of the U-shaped groove 111, so that a gap 600 is formed between the outer wall of the long arc segment 310 and the U-shaped groove 111, and the gap 600 provides deformation space for the sealing ring 300.

[0042] like Figures 3 to 5As shown, fulcrum 1 321 and fulcrum 2 322 are both close to the inner side of the short arc segment 320, and fulcrum 1 321 and fulcrum 2 322 are symmetrically arranged, and fulcrum 1 321 has rounded corner 1 3211, and fulcrum 2 322 has rounded corner 2 3221; fulcrum 1 321 abuts against the outer wall of the connecting tube 200 through rounded corner 1 3211, and fulcrum 2 322 abuts against the outer wall of the connecting tube 200 through rounded corner 2 3221.

[0043] The first fulcrum 321 and the second fulcrum 322 abut against the outer wall of the connecting tube 200, so that a ventilation gap 500 is maintained between the long arc segment 310 and the connecting tube 200. The first ventilation gap 400 and the second ventilation gap 500 can allow the test air or water to pass through, thereby improving the detection accuracy.

[0044] At least three long arc segments 310 and short arc segments 320 are provided, and the long arc segments 310 and short arc segments 320 are spaced apart. In at least one embodiment, four long arc segments 310 and four short arc segments 320 are provided. The long arc segments 310 and the short arc segments 320 are integrally formed, so that the sealing ring 300 has elastic deformation properties. The long arc segments 310 and the short arc segments 320 are made of one or more of polytetrafluoroethylene, nitrile rubber, and silicone rubber.

[0045] like Figure 2 、 Figure 8 As shown, a latch 112 is provided in the socket 110 , and the latch 112 is close to the U-shaped groove 111 . When the clamping tube 100 is deformed after being clamped by the clamp, the latch 112 will be clamped on the outer wall of the connecting tube 200 to prevent the connecting tube 200 from falling off from the socket 110 .

[0046] like Figures 9 to 12 As shown, as another solution, the outer wall of the connecting tube 200 is provided with a clamping groove 210. The clamping groove 210 is annular and close to the U-shaped groove 111. After the sealing ring 300 is deformed, the inner surfaces of the long arc segment 310 and the short arc segment 320 are pressed tightly into the clamping groove 210, thereby increasing the contact area between the sealing ring 300 and the outer wall of the connecting tube 200. Multiple clamping grooves 210 can be provided at intervals. In some embodiments, the clamping groove 210 can also be replaced with a threaded groove.

[0047] A connector 130 is provided at one end of the compression pipe 100 away from the socket 110 . The connector 130 can be used to connect to other pipes.

[0048] The working principle of this utility model is as follows:

[0049] like Figure 6 、 Figure 7 、 Figure 10As shown, before the compression tube 100 and the connecting tube 200 are connected, the sealing ring 300 is first installed in the U-shaped groove 111 so that the U-shaped groove 111 limits the sealing ring 300. After the connecting tube 200 is inserted into the socket 110, the fulcrum 1 321 and the fulcrum 2 322 of each short arc segment 320 abut against the outer wall of the connecting tube 200. If the compression tube 100 is not compressed using a clamp (or caliper), the inner surfaces of the long arc segment 310 and the arc segment 310 do not fit the outer wall of the connecting tube 200, and the ventilation gap 1 400 and the ventilation gap 2 500 are maintained. At this time, the sealing ring 300 does not seal the gap between the connecting tube 200 and the compression tube 100. As long as the compression tube 100 or the connecting tube 200 is pressurized or water-supplied, leakage will occur at the ventilation gap 1 400 or the ventilation gap 2 500. This can determine whether the compression tube 100 has been processed by the clamp compression process, and whether the compression tube 100 and the connecting tube 200 are completely sealed by the sealing ring 300. Before the pipeline is put into use, the leaking location can be repaired and the hidden danger can be eliminated.

[0050] like Figure 8 、 Figure 12 As shown, after the clamping process is performed on the compression tube 100 using the clamp, the outer wall and bulge 120 of the compression tube 100 are permanently deformed toward the central axis of the compression tube 100. The sealing ring 300 is then squeezed and deformed by the U-shaped groove 111. The U-shaped groove 111 is filled with the sealing ring 300, and the ventilation gap 1 400 and ventilation gap 2 500 disappear. The inner surfaces of the long arc segment 310 and the short arc segment 320 are both in close contact with the outer wall of the connecting tube 200, and the outer surfaces of the long arc segment 310 and the short arc segment 320 are in close contact with the side walls of the U-shaped groove 111. At this time, the sealing ring 300 completely seals the gap between the connecting tube 200 and the compression tube 100. At the same time, the latch teeth 112 are engaged with the outer wall of the connecting tube 200, and the connecting tube 200 cannot be pulled out of the socket 110. The connection between the compression tube 100 and the connecting tube 200 is completed.

[0051] The specific embodiments described in this article are merely examples of the spirit of the present invention; technicians in the technical field of the present invention may make various modifications or additions to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A compression-type leak-proof pipe connection structure, characterized in that: The invention comprises a compression tube (100), a connecting tube (200), and a sealing ring (300); the compression tube (100) has a socket (110) at at least one end; the inner wall of the socket (110) has a U-shaped groove (111) and a bulge (120) is formed on the outer wall of the compression tube (100); the sealing ring (300) is elastic and is arranged in the U-shaped groove (111); the connecting tube (200) is inserted into the socket (110); The sealing ring (300) has a long arc segment (310) and a short arc segment (320) connected in a ring shape, and each of the long arc segment (310) and the short arc segment (320) is provided with at least one, and a fulcrum 1 (321) and a fulcrum 2 (322) are formed at both ends of the short arc segment (320), and an arc groove (323) is provided on the inner surface of the short arc segment (320), and the fulcrum 1 (321) and the fulcrum 2 (322) can abut against the connecting pipe (20 0), and a ventilation gap (400) is formed between the arc groove (323) and the connecting tube (200), the bulge (120) is deformed after being pressed, and the U-shaped groove (111) squeezes the sealing ring (300), so that the inner surfaces of the long arc segment (310) and the short arc segment (320) are both in close contact with the outer wall of the connecting tube (200), thereby sealing the gap between the connecting tube (200) and the pressing tube (100).

2. The compression-type leak-proof pipe connection structure according to claim 1, characterized in that: The radius of the long arc segment (310) is R1, and the radius of the short arc segment (320) is R2, where R1>R2.

3. The compression-type leak-proof pipe connection structure according to claim 1, characterized in that: The outer side of the short arc segment (320) has an outwardly convex protrusion (324), and the protrusion (324) abuts against the U-shaped groove (111), so that a gap (600) is formed between the outer wall of the long arc segment (310) and the U-shaped groove (111).

4. The compression-type leak-proof pipe connection structure according to claim 1, characterized in that: The fulcrum one (321) and the fulcrum two (322) are both close to the inner side of the short arc segment (320), and the fulcrum one (321) and the fulcrum two (322) are symmetrically arranged, and the fulcrum one (321) has a rounded corner one (3211), and the fulcrum two (322) has a rounded corner two (3221).

5. The compression-type leak-proof pipe connection structure according to claim 4, characterized in that: The first fulcrum (321) and the second fulcrum (322) abut against the outer wall of the connecting pipe (200), and a second ventilation gap (500) is maintained between the long arc segment (310) and the connecting pipe (200).

6. The compression-type leak-proof pipe connection structure according to any one of claims 1 to 5, characterized in that: The cross-sectional shapes of the long arc segment (310) and the short arc segment (320) are both circular, and the long arc segment (310) and the short arc segment (320) are integrally formed.

7. The compression-type leak-proof pipe connection structure according to claim 6, characterized in that: At least three of the long arc segments (310) and the short arc segments (320) are provided, and the long arc segments (310) and the short arc segments (320) are distributed at intervals.

8. The compression-type leak-proof pipe connection structure according to claim 6, characterized in that: The long arc segment (310) and the short arc segment (320) have the same thickness.

9. The compression-type leak-proof pipe connection structure according to any one of claims 1 to 5, characterized in that: A latching tooth (112) is provided in the socket (110), and the latching tooth (112) is close to the U-shaped groove (111). The clamping tube (100) is deformed after being clamped, so that the latching tooth (112) clamps the outer wall of the connecting tube (200).

10. The compression-type leak-proof pipe connection structure according to any one of claims 1 to 5, characterized in that: The outer wall of the connecting pipe (200) is provided with a clamping groove (210), and the clamping groove (210) is close to the U-shaped groove (111). After the sealing ring (300) is deformed, the inner surfaces of the long arc segment (310) and the short arc segment (320) are both pressed tightly into the clamping groove (210).

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