Quick welding structure of PTFE (Polytetrafluoroethylene) pipeline

Abstract

The utility model discloses a quick welding structure of a PTFE (Polytetrafluoroethylene) pipeline, which comprises a quick welding joint, the welding end of the PTFE pipeline is connected through the quick welding joint, the quick welding joint is matched with the welding end of the PTFE pipeline, the quick welding joint comprises a PFA (Polyfluoroalkoxy) block arranged along the periphery of the welding end of the PTFE pipeline, and an electromagnetic induction metal block is embedded in the PFA block. The quick welding joint comprises a first joint and a second joint, the first joint is arranged at one welding end of one PTFE pipeline, and the second joint is arranged at the welding end of the other PTFE pipeline; the first connector can be divided into a first assembling part and a second assembling part along the PTFE pipeline, at least one of the first assembling part and the second assembling part is inwards provided with a sliding block in the radial direction of the PTFE pipeline, and a sliding groove matched with the sliding block is formed in the outer side of the PTFE pipeline. The two connectors are positioned through the sliding grooves, melting of PFA is achieved in an electromagnetic induction heating mode, and therefore rapid welding of the PTFE pipeline is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, in particular to a quick welding structure of an electronic-grade polytetrafluoroethylene tube. Background Art

[0002] The pipe connection methods commonly used in the chemical industry and other industries are mainly flange connection and threaded connection. These traditional connection methods have good sealing performance. However, when facing pipes made of specific materials (such as polytetrafluoroethylene (PTFE)), the chemical inertness and low thermal conductivity of the PTFE material itself make it difficult to effectively weld them using traditional welding methods.

[0003] To overcome this problem, the industry typically uses mechanical processing to achieve a tight fit at the interface. However, this method is not only time-consuming and labor-intensive, but its reliability in special environments remains questionable. A second method involves using special adhesives such as PFA (a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene) for fixed welding. However, this method requires significant labor and cannot avoid uneven welding. For PVC pipes, a melting machine can also be used to melt the joints of the two pipes and fit them together through a mold, assembling them and cooling them to fuse. However, this method has several drawbacks: it reduces pipe length, requires sufficient operating space, and is not suitable for thick-walled pipes. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a connection structure between a high-purity chemical storage tank and a pipeline, thereby solving the problems of leakage and contamination at the connection between the storage tank and the pipeline.

[0005] In order to achieve the above objectives, the technical solution provided by the present invention is:

[0006] A quick welding structure for PTFE pipes includes a quick welding joint, with the welding ends of the PTFE pipes connected via the quick welding joint. The quick welding joint is adapted to fit the welding ends of the PTFE pipes. The quick welding joint also includes a PFA block disposed along the outer periphery of the PTFE pipe welding end. The PFA block is inlaid with an electromagnetic induction metal block, preferably a conductive metal ring. The electromagnetic induction metal block is heated by an electromagnetic induction heater, melting the PFA, and achieving a non-contact welding effect on the PTFE pipe.

[0007] In order to facilitate the installation of the quick welding structure, the technical solution adopted by the present invention includes: the quick welding joint includes a first joint and a second joint, the first joint is arranged at one welding end of the PTFE pipe, and the second joint is arranged at the welding end of the other PTFE pipe.

[0008] At least one of the first joint and the second joint is divided into a first assembly part and a second assembly part, which can be assembled along the radial direction of the pipeline without having to be inserted from one end of the pipeline. In this case, an electromagnetic induction metal block and a PFA block are preferred.

[0009] Furthermore: the first assembly part and the second assembly part are assembled by snap fastening.

[0010] Furthermore, the second joint is divided into a first assembly part and a second assembly part. The purpose of setting at least one of the two joints, preferably both joints, as a split assembly structure is to facilitate the rapid disassembly of the welded joint so as to recycle the conductive metal ring.

[0011] To enhance ease of use, improve the stability of the welded structure, and facilitate pressure application to the PFA block during welding, the present invention also provides a technical solution in which either the first or second joint extends with internal threads, while the other joint is provided with a bolt portion adapted to the internal threads. The two joints, through the bolt structure, move toward each other, applying pressure to the molten PFA block, compressing the space within the PFA block and forcing the PFA to flow into the welded end of the PTFE pipe.

[0012] Furthermore, the first joint or the second joint extends an internal thread, and the other joint is provided with a bolt portion adapted to the internal thread. The two joints move toward each other through the bolt structure, thereby applying pressure to the PFA block.

[0013] Furthermore, a guide post extends from the outer ring of the first or second joint, and a guide hole is provided in the other joint. The guide hole can also function as a threaded bolt structure, but welding requires continuous force application. The advantage is that it is easier to assemble and disassemble than a threaded bolt structure.

[0014] Furthermore: the cross section of the PFA block is rhombus-shaped.

[0015] Furthermore: the welding end of the PTFE pipe is provided with a chamfer to improve the stability of the welding structure.

[0016] In order to prevent the PTFE pipe and the quick welding joint from moving, the technical solution provided by the utility model further includes: a sliding groove is provided inside the quick welding joint.

[0017] Furthermore: the PTFE pipe is provided with a slider adapted to the slide groove, but the length of the slide groove should allow the quick welding joint to achieve the movement of the aforementioned guide column or internal thread and other settings.

[0018] The chute can also be used in conjunction with round pipe fasteners, such as clamps, to achieve the function instead of using a slider setting.

[0019] Furthermore: Without involving the slide block structure, marking lines with a marker on site can also prevent the PTFE pipe and the quick welding joint from moving.

[0020] Furthermore: the PTFE pipe is provided with a slide groove, and the joint is provided with a slider to achieve the above purpose. The subtractive processing is easier to achieve, but it will affect the pipe wall thickness.

[0021] In order to facilitate installation, a flat surface is provided on the outer side of the quick welding joint for convenient clamping with pipe clamps or the like, so that the internal thread and the bolt portion can be tightened more easily.

[0022] Furthermore, a rotating handle is provided on the outer side of the quick welding joint, so that the first joint and the second joint can be tightened even when there is no professional equipment such as pipe clamps.

[0023] The technical effects of the utility model are as follows:

[0024] 1. Provides a fast welding structure for PTFE pipes, which heats the conductive metal through electromagnetic induction to quickly melt the PFA block, greatly reducing the manual labor intensity of PTFE pipe welding.

[0025] 2. The PTFE pipe is tightly combined by PFA welding, which significantly enhances the connection strength and achieves efficient welding without destroying the surface integrity of the PTFE material;

[0026] 3. This welding structure can significantly improve the pressure bearing and anti-leakage capabilities of the interface, extending the service life of the PTFE pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the first embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view along AA after the first embodiment of the present invention is assembled with the PTFE pipe;

[0029] Figure 3 This is a schematic cross-sectional view of the utility model after being assembled with a PTFE pipe according to the second or third embodiment;

[0030] Figure 4 This is a schematic cross-sectional view of the electromagnetic induction metal block of the present invention.

[0031] Reference numerals:

[0032] 1-quick welding joint, 2-PTFE pipe, 3-PFA block, 4-electromagnetic induction metal block, 5-first joint, 6-second joint, 7-first assembly part, 8-second assembly part, 9-slider, 10-slide groove, 11-clip, 12-internal thread, 13-bolt part, 14-chamfer, 15-plane, 16-rotation handle, 20-guide column, 21 guide hole, 22-coil. DETAILED DESCRIPTION

[0033] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1~Figure 2 A quick welding structure for a PTFE pipe includes a quick welding joint 1. The welding end of a PTFE pipe 2 is connected through the quick welding joint 1. The quick welding joint 1 is adapted to the welding end of the PTFE pipe 2. The quick welding joint 1 includes a PFA block 3 arranged along the outer periphery of the welding end of the PTFE pipe 2. The PFA block 3 is inlaid with an electromagnetic induction metal block 4. Preferably, the electromagnetic induction metal block 4 can be a conductive metal ring, but the conductive metal ring is preferably split into blocks. Please refer to Figure 4 This embodiment also provides a conductive metal ring with an inlaid structure, into which the welding end of the PTFE tube 2 is inserted. The shape of the conductive metal ring and the electromagnetic induction heating method enable the PFA block 3 to melt within the quick weld joint, bonding with the PTFE tube from the inside, facilitating a more uniform weld. Electromagnetic induction heating is not only safer, but also faster and more environmentally friendly.

[0036] The quick welding joint 1 includes a first joint 5 and a second joint 6. The first joint 5 is arranged at one welding end of the PTFE pipe 2, and the second joint 6 is arranged at the welding end of the other PTFE pipe. The first joint 5 is divided into a first assembly part 7 and a second assembly part 8 along the axis of the PTFE pipe. The first assembly part 7 is provided with a slider 9 radially inward along the PTFE pipe 2, and a slide 10 adapted to the slider 9 is provided on the outside of the PTFE pipe 2. When the first joint 5 is assembled, the slider 9 is installed in the slide 10 so that the first joint 5 moves axially along the PTFE pipe 2 in the slide 10. The setting of the slider 9 and the slide 10 can play a limiting role for the first joint 5. At this time, the second joint 6 can but does not have to have the same setting. It should also be noted that the slide 10 can be an annular groove, and the slider 9 slides along the width direction of the annular groove. In order to match the annular groove, the slider 9 can also be annular. Dividing the first joint 5 into the first assembly part 7 and the second assembly part 8 can, on the one hand, avoid the slider 9 from being unable to be installed on the PTFE pipe 2, and on the other hand, it is also conducive to the disassembly of the quick welding joint 1. The electromagnetic induction metal block 4 is as Figure 4 The setting is beneficial to form a loop with it, and the circumference of the ring can also be shortened, thereby pressing the PFA block. At the same time, the diamond setting is also convenient for disassembly to avoid damaging the weld.

[0037] The first assembly portion 7 and the second assembly portion 8 are assembled by means of a snap 11. The second joint 6 is also divided into the first assembly portion 7 and the second assembly portion 8 along the axis of the PTFE tube 2. The second joint 6 is also configured as a split assembly structure to facilitate the rapid disassembly of the welded joint to facilitate the recovery of the electromagnetic induction metal block 4.

[0038] The second joint 6 extends with an internal thread 12, and the first joint 5 is provided with a bolt portion 13 adapted to fit within the internal thread 12. The two joints move toward each other through relative rotation of the bolt structure, thereby applying pressure to the PFA block 3. In this embodiment, the relative rotation of the bolt structure generates a compressive force between the first joint 5 and the second joint 6, forcing the molten PFA block to be more tightly welded.

[0039] The cross-section of the PFA block 3 is a diamond shape, with one base of the diamond shape fitting over the PTFE tube 2. The welded end of the PTFE tube 2 is provided with a chamfer 14. The diamond shape of the PFA block 3 facilitates the technical effect of squeezing the molten PFA toward the weld site from both sides of the first and second joints 5, 6. Alternatively, a semicircular shape, such as one capable of receiving force and downward pressure from both sides, may be employed.

[0040] A flat surface 15 is provided on the outside of the PTFE pipe 2 for convenient clamping operations such as pipe pliers, so that the internal thread 12 and the bolt portion 13 can be tightened more easily; a rotating handle 16 is provided on the outside of the PTFE pipe 2 to facilitate tightening the first joint 5 and the second joint 6 when professional equipment such as pipe pliers is lacking.

[0041] In addition, it should be noted that, except for the electromagnetic induction metal block 4, the materials of the remaining parts should not affect the electromagnetic induction heating process. Preferably, they are temperature-resistant materials such as alumina ceramics, which have the poorest thermal conductivity. A cavity insulation can be formed inside the quick-connect joint to avoid affecting the pipeline structure, and an insulation layer can be provided on the cylindrical surface in contact with the pipeline.

[0042] Implementation steps:

[0043] S1: Prepare PTFE pipe 2 of corresponding size and matching quick welding joint 1;

[0044] S2: Fit the first assembly part 7 and the second assembly part 8 of the first joint 5 and the second joint 6 to the PTFE pipe 2 respectively and lock them with the buckle 11. At the same time, make sure that the slider 9 is inserted into the slide groove 10.

[0045] S3: The bolt structures of the first joint 5 and the second joint 6 are rotated relative to each other, and the PFA block 3 is pressed to the welding position.

[0046] S4: Confirm that the PFA block 3 is aligned with the welding part;

[0047] S5: Start the electromagnetic induction heater (preferably the coil 22, more preferably a detachable type) to perform local heating (i.e., the peripheral position of the internal thread 12) until the PFA block 3 softens and melts, and tighten the bolt structure again before the PFA cools and solidifies, thereby compressing the space where the PFA is located and forcing it to flow into the weld;

[0048] S6: Wait for cooling and solidification to be completed, and then remove the quick welding joint 1 and the electromagnetic induction metal block 4.

[0049] Example 2

[0050] See also Figure 3 , which is different from the first embodiment, the threaded bolt structure is replaced with a guide column 20 and a guide hole 21, which is easier to disassemble and assemble than the first embodiment.

[0051] The positions of the chute 10 and the slider 9 are interchanged to reduce unnecessary loss of the wall thickness of the PTFE pipe.

[0052] Example 3

[0053] See also Figure 3 , which is different from the second embodiment, there is no slider 10. The slide groove 10 is an annular groove. The slider 10 is installed at the position of the slider by using a circular fastener with a quick clamp structure, or by using a marker pen to mark the line on site. Specifically, mark lines are made on the PTFE pipes at both ends of the quick welding joint 1 to mark the joint length, especially the length from the welding position to the end of the joint. Just pay attention to the offset position when using it.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A rapid welding structure for PTFE pipes, characterized by: The quick welding joint is adapted to the welding end of the PTFE pipe. The quick welding joint comprises a PFA block arranged along the outer periphery of the welding end of the PTFE pipe, and the PFA block is inlaid with an electromagnetic induction metal block.

2. The rapid welding structure of PTFE pipe according to claim 1, characterized in that: The electromagnetic induction metal block is a conductive metal ring.

3. The rapid welding structure of PTFE pipe according to claim 1, characterized in that: The quick welding joint comprises a first joint and a second joint, at least one of the two joints comprises a first assembling part and a second assembling part, and the first assembling part and the second assembling part enable at least one joint to have a split assembly structure.

4. The rapid welding structure of PTFE pipe according to claim 3, characterized in that: The first assembling part and the second assembling part are assembled by snap fastening.

5. The rapid welding structure of PTFE pipe according to claim 3, characterized in that: At least one of the first joint and the second joint is divided into a first assembling portion and a second assembling portion.

6. The rapid welding structure of PTFE pipe according to claim 3, characterized in that: An internal thread extends from the first joint or the second joint, and the other joint is provided with a bolt portion adapted to the internal thread, and the two joints achieve relative movement by rotating the bolt.

7. The rapid welding structure of PTFE pipe according to claim 1, characterized in that: A guide post extends from the first joint or the second joint, and the other joint is provided with a guide hole adapted for the guide post. The two joints move toward each other through the guide post and the guide hole, compressing the cavity created by the molten PFA block, so that the molten PFA is pressurized and flows into the welding end portion of the PTFE pipe.

8. The rapid welding structure of PTFE pipe according to claim 1, characterized in that: A slide groove is provided inside the quick welding joint.

9. The rapid welding structure of PTFE pipe according to claim 8, characterized in that: A sliding block adapted to the sliding groove is provided on the outer side of the PTFE pipe, and the sliding groove and the sliding block enable the two joints to move toward each other.

10. The rapid welding structure of PTFE pipe according to claim 1, characterized in that: At least one of a rotating handle and a plane is provided on the outer side of the quick welding joint.

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