Annular bonding type pipeline connecting structure

Abstract

The utility model discloses a ring bonding type pipeline connecting structure which comprises a pipe fitting head, the pipe fitting head is provided with at least two bellmouths used for being connected with pipes, the inner diameter of each bellmouth is larger than that of the pipe fitting head, and each bellmouth is sequentially divided into a sealing section and a threaded section from inside to outside. The wide-belt hollow-out sealing ring is of an annular structure, a plurality of hollow-out areas which are evenly distributed in the circumferential direction are arranged on the annular face of the wide-belt hollow-out sealing ring, and the wide-belt hollow-out sealing ring is used for being arranged between a connecting port of a pipe and a bellmouth of a pipe fitting head in a sleeved mode to form sealing. Compared with a traditional clamping and pressing type and annular pressing type connecting mode, the sealing device is simpler in structure, low in cost, better in sealing effect and suitable for application scenes such as water supply and drainage, fire fighting, heating and ventilation, medical treatment and ships of industrial and civil buildings, and has the double-sealing advantage of the sealing ring and the anaerobic adhesive.

Description

Technical Field

[0001] This utility model relates to the field of pipe connectors, and in particular to a ring-bonded pipe connection structure. Background Technology

[0002] In recent years, stainless steel pipes connected by cold extrusion have been increasingly used in the field of pipe connection technology due to their characteristics such as no threading, no welding, and convenient and quick installation. Currently, the publicly available and mature cold extrusion connection methods for steel pipes are mainly crimping and ring pressing, but both of these cold extrusion connection methods have certain drawbacks.

[0003] A press-fit connection is a method of connecting pipes using fittings with special O-rings (sealing rings) and sealing and securing the pipe ends by pressing them together with a special tool. It involves using external force to compress the fittings and pipe into a hexagonal shape, creating a square recess. The rigidity of the metal increases the frictional resistance between the pipe and fitting at the six corners of the hexagon, achieving a lock-in effect. The O-rings in the fitting socket provide the seal. While this structure offers some tensile strength and sealing performance, because it's a linear seal, the product itself and the six corners are not subjected to sufficient compressive force during the pressing process, thus affecting its sealing performance, tensile strength, and pressure resistance. Specifically... Figures 1A-1C As shown.

[0004] A compression fitting is a mechanical pipe connection method that uses a special tool to press a pipe fitting, along with a cylindrical rubber sealing ring, into a stainless steel pipe circumferentially. The biggest advantage of this connection is that it replaces the O-ring used in a press-fit connection with a cylindrical rubber sealing ring, changing from a linear seal to a wide-band seal. The compression locking method uses a circumferential inward pressing motion, resulting in a more stable locking structure than a press-fit connection. However, this connection is still significantly limited by the strength of the product itself, and the sealing ring can be squeezed out of the compression port when the pressure inside the pipe increases, leading to seal failure. This limits the pipe's pressure resistance and applicable diameter. Specifically... Figures 2A-2C As shown. Summary of the Invention

[0005] To address the aforementioned issues, this utility model provides a ring-adhesive pipe connection structure. Compared to press-fit and ring-press connection methods, the structure is simpler and less expensive. It also features a dual sealing advantage of a sealing ring and anaerobic adhesive, resulting in better sealing performance. This structure is suitable for applications in industrial and civil buildings, including water supply and drainage, fire protection, HVAC, medical, and marine applications.

[0006] The technical solution of this utility model is as follows:

[0007] A ring-bonded pipe connection structure, comprising:

[0008] A pipe fitting having at least two sockets for connecting pipes, the inner diameter of the sockets being larger than the inner diameter of the pipe fitting, the sockets being divided into a sealing section and a threaded section from the inside out;

[0009] A wide-band perforated sealing ring has a ring-shaped structure with several perforated areas evenly distributed circumferentially on its surface. These perforated areas are used to fill anaerobic adhesive. The perforated areas are located on the side of the wide-band perforated sealing ring that results in a wide segment at one end and a narrow segment at the other. The wide-band perforated sealing ring is used to fit between the connection port of the pipe and the socket of the fitting to form a seal.

[0010] The working principle of the above technical solution is as follows:

[0011] This invention features a wide-band perforated sealing ring at the end of the pipe. Anaerobic adhesive is applied to the perforated area of ​​the annular wide-band perforated sealing ring. After insertion into the pipe fitting socket, a crimping tool is used to press the wide-band perforated sealing ring, anaerobic adhesive, and pipe together circumferentially. The wide-band perforated sealing ring adopts a design that is wide at the bottom, narrow at the top, and hollow in the middle. After installation, the wide section of the wide-band perforated sealing ring faces the pipe fitting, effectively filling the gap between the pipe and the pipe fitting socket. When the pipe is inserted into the gap of the pipe fitting socket, the pipe will first tightly adhere to the sealing section of the pipe fitting socket and the wide surface of the bottom of the wide-band perforated sealing ring, forming a circumferential sealing structure. When positive pressure occurs inside the pipe, the pressure will compress the wide-band perforated sealing ring. Under pressure, the wide-band perforated sealing ring will become increasingly tight due to its special structure, resulting in a better sealing effect. Meanwhile, because the wide-band perforated sealing ring has a wide-band perforated structure, anaerobic adhesive can be filled in the perforated area. Due to its special structure and installation position, the anaerobic adhesive in the perforated area will not overflow into the pipe after installation and compression, thus avoiding the risk of anaerobic adhesive overflowing and clogging the pipe.

[0012] During installation, a wide-band perforated sealing ring is first installed at the pipe connection end, and a layer of anaerobic adhesive is applied to the perforated area of ​​the wide-band perforated sealing ring. Then, the pipe is inserted into the socket of the fitting. Because the anaerobic adhesive only adheres to the gap formed between the outer wall of the pipe, the inner wall of the threaded section of the fitting, and the perforated area of ​​the wide-band perforated sealing ring, the presence of the bottom of the wide-band perforated sealing ring effectively prevents the anaerobic adhesive from overflowing into the pipe. The width of the anaerobic adhesive filling is consistent with the width of the perforated area of ​​the wide-band perforated sealing ring, which effectively eliminates adhesive waste and saves material resources. Because the anaerobic adhesive is in a narrow gap and uses circumferential pressing technology, it effectively isolates the oxygen environment, allowing the anaerobic adhesive to solidify quickly, thereby playing a role in secondary sealing and enhancing pull-out force (after solidification, the anaerobic adhesive has excellent adhesion and torque resistance).

[0013] Next, a crimping tool (with a limiting step at one end of its inner cavity, positioned by the end face of the pipe fitting, forming a circumferential sealing structure with two or more sealing rings after shrinkage crimping) is used for crimping. For pipes ≤DN100 in diameter, a two-sealing-ring configuration is used; for pipes >DN100 in diameter, a multi-sealing-ring structure is selected. Alternatively, a single-sealing-ring crimping method can be used. To ensure effective solidification of the anaerobic adhesive, the core of the crimping tool can be a circumferential plane, a spiral, or other forms.

[0014] In a further technical solution, the wall thickness of the pipe fitting head and its socket is consistent with the wall thickness of the pipe material, so as to ensure that the pipe fitting head has sufficient circumferential strength during crimping and prevent the pipe wall from collapsing during crimping, thus preventing sealing failure.

[0015] In a further technical solution, the inner wall of the threaded section of the socket is tapped or knurled to ensure that the fitting head has a stronger pull-out force after being connected to the pipe, thereby increasing the pressure-bearing capacity of the pipeline. In addition, in low-pressure pipeline connection systems, the threaded section may not be provided.

[0016] In a further technical solution, the pipe fitting head can be a pipe cap, a straight pipe fitting head, an elbow pipe fitting head, a tee pipe fitting head, a cross pipe fitting head, a reducing straight pipe fitting head, a reducing elbow pipe fitting head, a reducing tee pipe fitting head, or a reducing cross pipe fitting head. For pipe caps, tees, crosses, and reducing pipes, they can be formed by welding. For straight pipes and elbows, they can be formed in one step by machining or by welding.

[0017] In a further technical solution, for convenient and quick installation, the wide-band hollow sealing ring can be made of self-lubricating silicone rubber or EPDM rubber.

[0018] In a further technical solution, for pipeline connections used in the gas field, the wide-band perforated sealing ring can also be made of self-lubricating fluororubber or nitrile rubber.

[0019] In a further technical solution, the wide-band hollow sealing ring is made of mild steel or copper.

[0020] The beneficial effects of this utility model are:

[0021] This utility model is a further improvement on the original ring-pressure connection. Its pipe fitting structure is simpler than that of the ring-pressure connection pipe fitting. The pipe fitting head only retains a socket section, which is simple in structure, low in cost, and very easy to manufacture. In contrast, the socket of the existing ring-pressure pipe fitting consists of two sections, a sealing section and a socket section, and a wide annular sealing ring is used to seal the sealing section. When there is positive pressure inside the pipe, the sealing ring is easily squeezed out from the sealing section, resulting in sealing failure. Moreover, this connection relies entirely on a single ring-pressure locking, which limits its tensile strength and pressure resistance. This invention employs a weld-free mechanical connection method where anaerobic adhesive is applied to the hollowed-out area of ​​a wide-band hollowed-out sealing ring at the end of the pipe. After insertion into the pipe fitting socket, a special tool is used to press the wide-band hollowed-out sealing ring, anaerobic adhesive, and pipe together in the circumferential direction. The anaerobic adhesive effectively increases the pull-out resistance of the pipe connection and prevents the sealing ring from being squeezed out under positive pressure, providing a dual sealing advantage of sealing ring + anaerobic adhesive. Furthermore, the connection structure uses a crimping tool to sequentially press and lock the socket twice, further enhancing the pull-out resistance of the pipe connection. Secondly, the ring-bonded connection, as a wide-band circumferential sealing method, effectively prevents the anaerobic adhesive from overflowing into the pipe, significantly improving the sealing reliability of the pipe connection and reducing maintenance costs while avoiding the risk of pipe blockage. Attached Figure Description

[0022] Figure 1A This is a schematic diagram of the existing technology of using a compression connection between pipes before compression.

[0023] Figure 1B This is a schematic diagram of the compression connection between pipes in the existing technology.

[0024] Figure 1C This is a schematic diagram of a cross-section of a pipe using a press-fit connection in the prior art;

[0025] Figure 2A This is a schematic diagram of the existing technology of using a ring-pressure connection between pipes before ring pressure is applied;

[0026] Figure 2B This is a schematic diagram of the ring-pressure connection between pipes in the existing technology after ring pressure.

[0027] Figure 2C This is a schematic diagram of the socket of a ring-pressure pipe fitting in the prior art;

[0028] Figure 3 This is a schematic diagram of the split structure of the ring-bonded pipe connection structure described in Embodiment 1 of this utility model;

[0029] Figure 4 This is a schematic diagram of the assembly structure of the ring-bonded pipe connection structure described in Embodiment 1 of this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the wide-band hollow sealing ring described in Embodiment 1 of this utility model;

[0031] Figure 6 This is an effect diagram of the sealing ring formed by two pressing cycles as described in Embodiment 2 of this utility model;

[0032] Figure 7 This is an effect diagram of the sealing ring formed by one pressing as described in Embodiment 3 of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] Figures 2A-2C Explanation of the reference numerals in the attached diagrams: 1. Sealing ring; 2. Pipe; 3. Pipe fitting; 4. Ring compression area;

[0035] Figures 3-7 The following are the annotations in the attached drawings: 1. Pipe fitting head; 2. Sealing section; 3. Threaded section; 4. Wide-band perforated sealing ring; 5. Anaerobic adhesive; 6. Pipe; 7. Crimping tool; 8. Perforated area. Detailed Implementation

[0036] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Example

[0037] A ring-bonded pipe connection structure, such as Figures 3-5 As shown, it includes:

[0038] Pipe fitting 1, which has at least two sockets for connecting pipe 6, the inner diameter of the sockets being larger than the inner diameter of the pipe fitting 1, and the sockets being divided into a sealing section 2 and a threaded section 3 from the inside out;

[0039] A wide-band perforated sealing ring 4 has an annular structure with several perforated areas 8 evenly distributed circumferentially on its surface. The perforated areas 8 are filled with anaerobic adhesive 5. The perforated areas 8 are located on the side of the wide-band perforated sealing ring 4, so that the two ends of the wide-band perforated sealing ring 4 have a wide section and a narrow section structure. The wide-band perforated sealing ring 4 is used to fit between the connection port of the pipe 6 and the socket of the fitting head 1 to form a seal.

[0040] This invention features a wide-band perforated sealing ring 4 at the end of the pipe 6. Anaerobic adhesive 5 is applied to the perforated area 8 of the annular wide-band perforated sealing ring 4. After insertion into the socket of the pipe fitting 1, a crimping tool 7 is used to press the wide-band perforated sealing ring 4, anaerobic adhesive 5, and pipe 6 together in the circumferential direction. The wide-band perforated sealing ring 4 adopts a design that is wide at the bottom, narrow at the top, and perforated in the middle. After installation, the wide section of the wide-band perforated sealing ring 4 faces the pipe fitting 1, effectively filling the gap between the pipe 6 and the socket of the pipe fitting 1. When the pipe 6 is inserted into the gap of the socket of the pipe fitting 1, the pipe 6 will first tightly adhere to the sealing section 2 of the socket of the pipe fitting 1 and the wide-band surface at the bottom of the wide-band perforated sealing ring 4, forming a circumferential sealing structure. When positive pressure occurs inside the pipe, the pressure will compress the wide-band perforated sealing ring 4. Under pressure, the wide-band perforated sealing ring 4 will become increasingly tight due to its special structure, resulting in a better sealing effect. Meanwhile, because the wide-band hollow sealing ring 4 has a wide-band hollow structure, anaerobic adhesive 5 can be filled in the hollow area 8. Due to its special structure and installation position, the anaerobic adhesive 5 in the hollow area 8 will not overflow into the pipe after installation and compression, thus avoiding the risk of anaerobic adhesive 5 overflowing and blocking the pipe.

[0041] During installation, a wide-band perforated sealing ring 4 is first installed at the connection end of the pipe 6, and a layer of anaerobic adhesive 5 is applied to the perforated area 8 of the wide-band perforated sealing ring 4. Then, the pipe 6 is inserted into the socket of the fitting head 1. Because the anaerobic adhesive 5 only adheres to the gap formed by the outer wall of the pipe 6, the inner wall of the threaded section 3 of the fitting head 1, and the perforated area 8 of the wide-band perforated sealing ring 4, the presence of the bottom of the wide-band perforated sealing ring 4 can effectively prevent the anaerobic adhesive 5 from overflowing into the pipe. The filling width of the anaerobic adhesive 5 is consistent with the width of the perforated area 8 of the wide-band perforated sealing ring 4, which can effectively prevent adhesive waste and save material resources. Because the anaerobic adhesive 5 is in a narrow gap and adopts circumferential pressing technology, it effectively isolates the oxygen environment and can solidify quickly, thereby playing a role in secondary sealing and enhancing pull-out force (the anaerobic adhesive 5 has excellent adhesion and torque resistance after solidification).

[0042] Next, the pipe fitting is formed using a crimping tool 7 (which has a limiting step at one end of its inner cavity, positioned by the end face of the fitting head 1, forming a circumferential sealing structure with two or more sealing rings after shrink crimping). For pipes with a diameter ≤DN100, a two-sealing-ring configuration is used; for pipes with a diameter >DN100, a multi-sealing-ring structure is used. Alternatively, a single-sealing-ring crimping method can be used. To ensure effective solidification of the anaerobic adhesive 5, the core of the crimping tool 7 can be a circumferential plane, a spiral, or other forms.

[0043] In another embodiment, the wall thickness of the fitting head 1 and its socket is consistent with the wall thickness of the pipe 6, so as to ensure that the fitting head 1 has sufficient circumferential strength during crimping and prevent the pipe wall from collapsing during crimping, thus preventing sealing failure.

[0044] In another embodiment, the inner wall of the threaded section 3 of the socket is tapped or knurled to ensure that the fitting head 1 has a stronger pull-out force after being connected to the pipe 6, thereby increasing the pressure-bearing capacity of the pipeline. In addition, in low-pressure pipeline connection systems, the threaded section 3 may not be provided.

[0045] In another embodiment, the pipe fitting head 1 can be a pipe cap, a straight pipe fitting head 1, an elbow pipe fitting head 1, a tee pipe fitting head 1, a cross pipe fitting head 1, a reducing straight pipe fitting head 1, a reducing elbow pipe fitting head 1, a reducing tee pipe fitting head 1, or a reducing cross pipe fitting head 1. For pipe caps, tees, crosses, and reducing pipes, they can be formed by welding. For straight pipes and elbows, they can be formed in one step by machining or by welding.

[0046] In another embodiment, for ease and quick installation, the wide-band perforated sealing ring 4 can be made of self-lubricating silicone rubber or EPDM rubber.

[0047] In another embodiment, for pipeline connections used in the gas field, the wide-band perforated sealing ring 4 can also be made of self-lubricating fluororubber or nitrile rubber.

[0048] In another embodiment, the wide-band hollow sealing ring 4 is made of mild steel or copper. Example

[0049] A method for ring-bonded pipe connection suitable for piping systems with a pressure rating >1.0MPa includes the following steps:

[0050] 1. Select pipes with burr-free cross-sections, beveled cuts, non-roundness, and wall thickness that meet national standards;

[0051] 2. Place the self-lubricating wide-band perforated sealing ring onto the connection end of the pipe, and then apply anaerobic adhesive to the perforated area of ​​the wide-band perforated sealing ring.

[0052] 3. Insert the pipe with the wide-band perforated sealing ring and the anaerobic adhesive into the pipe fitting socket until it is inserted to the bottom of the socket. To visually check whether the pipe is fully inserted into the bottom of the pipe fitting socket, you can mark the length of the gap between the pipe fittings before inserting the pipe.

[0053] 4. After the pipe is inserted into the bottom of the socket, the pipe fitting or the pipe can be rotated appropriately to make the anaerobic adhesive more evenly distributed. If the on-site construction conditions do not allow for this, rotation is not necessary.

[0054] 5. Finally, use a crimping tool to crimp the pipe fitting. During crimping, ensure the end of the fitting's socket is placed on the limiting step at one end of the crimping tool's die before applying pressure, creating a double-crimped sealing ring. The effect of double crimping is shown in the diagram below. Figure 6 As shown, after the crimping is completed, wipe away the trace amount of anaerobic adhesive squeezed out from the outer surface of the pipe with a cloth. Example

[0055] A method for ring-bonded pipe connection suitable for piping systems with a pressure rating ≤1.0MPa includes the following steps:

[0056] 1. Select pipes with burr-free cross-sections, beveled cuts, non-roundness, and wall thickness that meet national standards;

[0057] 2. Place the self-lubricating wide-band perforated sealing ring on the pipe, and then push the pipe together with the wide-band perforated sealing ring into the fitting head socket until it is inserted to the bottom of the socket. To visually feel whether the pipe is fully inserted into the bottom of the fitting head socket, you can mark it according to the length of the fitting head socket before inserting the pipe.

[0058] 3. Finally, use a crimping tool to crimp the fittings. During crimping, ensure the outer end of the fitting shell is placed on the limiting step at one end of the fitting's inner cavity before applying pressure, creating a sealing ring effect after one crimp. The effect of one crimp is shown in the diagram. Figure 7 As shown.

[0059] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A ring-bonded pipe connection structure, characterized in that, include: A pipe fitting having at least two sockets for connecting pipes, the inner diameter of the sockets being larger than the inner diameter of the pipe fitting, the sockets being divided into a sealing section and a threaded section from the inside out; A wide-band perforated sealing ring, which has a ring structure and several perforated areas evenly distributed along the circumference on its ring surface, is used to form a seal between the connection port of the pipe and the socket of the fitting.

2. The ring-bonded pipe connection structure according to claim 1, characterized in that, The hollow area of ​​the wide-band hollow sealing ring is filled with anaerobic adhesive, and the hollow area is close to one side of the wide-band hollow sealing ring, so that the two ends of the wide-band hollow sealing ring have a wide segment and a narrow segment structure.

3. The ring-bonded pipe connection structure according to claim 1, characterized in that, The wall thickness of the pipe fitting head and its socket is the same as the wall thickness of the pipe.

4. The ring-bonded pipe connection structure according to claim 1, characterized in that, The inner wall of the threaded section of the socket is tapped or knurled.

5. The ring-bonded pipe connection structure according to claim 1, characterized in that, The pipe fittings are pipe caps, straight pipe fittings, elbow pipe fittings, tee pipe fittings, cross pipe fittings, reducing straight pipe fittings, reducing elbow pipe fittings, reducing tee pipe fittings, or reducing cross pipe fittings.

6. The ring-bonded pipe connection structure according to claim 1, characterized in that, The wide-band hollow sealing ring is made of self-lubricating silicone rubber or EPDM rubber.

7. The ring-bonded pipe connection structure according to claim 1, characterized in that, The wide-band perforated sealing ring is made of self-lubricating fluororubber or nitrile rubber.

8. The ring-bonded pipe connection structure according to claim 1, characterized in that, The wide-band hollow sealing ring is made of mild steel or copper.

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