Pipeline connecting device

Abstract

The invention discloses a pipeline connecting device which comprises a connector body, at least one radial sealing piece and at least one pressing piece, the connector body comprises at least one pipe connecting part and at least one limiting part, each pipe connecting part is provided with a through hole used for being communicated with a pipeline to be connected, and each limiting part is arranged on the periphery of the corresponding pipe connecting part in a surrounding mode. A groove is formed between the inner wall of the limiting part and the periphery of the pipe connecting part and used for containing the corresponding radial sealing piece. When the pipeline connecting device is connected with at least one to-be-connected pipeline, the first end of the to-be-connected pipeline is arranged on the periphery of the corresponding pipe connecting part in a sleeving mode, the corresponding radial sealing piece is located between the inner wall of the limiting part and the periphery of the to-be-connected pipeline, and the corresponding pressing piece is locked to the end, facing the to-be-connected pipeline, of the limiting part. And the radial sealing piece is pressed in the axial direction of the to-be-connected pipeline, so that the inner wall of the radial sealing piece is in interference fit with the periphery of the to-be-connected pipeline for radial sealing. The mounting process is simple and convenient, and the to-be-connected pipeline can be quickly disassembled and assembled.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor manufacturing, and in particular to a pipeline connecting device. Background Art

[0002] In the field of microelectronics manufacturing, the etching process has always been considered the most critical step in microelectronics manufacturing. During the entire etching process, semiconductor wet equipment is required to perform multiple wet treatments on the wafer, such as wet etching and cleaning of the wafer.

[0003] In semiconductor wet process equipment, discharge pipelines are often configured for waste liquid collection to achieve classified discharge and treatment of waste chemical solutions. The discharge pipeline is often connected by multiple sections of smooth PFA (Polyfluoroalkoxy, soluble polytetrafluoroethylene) pipes through pipe connection devices. The pipe connection devices are required to be firmly connected, corrosion-resistant, well sealed, and space-saving.

[0004] However, in the connection of the discharge pipeline of the existing semiconductor wet process equipment, there are two commonly used connection schemes. One scheme is to connect the two adjacent PFA tubes to be connected by welding. Although it can meet the requirements of firm connection, corrosion resistance, good sealing and space saving, the installation process is complicated, the technical content is high, and it is not easy to maintain, which is not conducive to the rapid disassembly and assembly of the discharge pipeline. Another scheme is to connect one end of the PFA tube to be connected with the joint body of the pipeline connection device. The joint nut of the pipeline connection device is sleeved on the outer periphery of the PFA tube and is threadedly connected to the outer wall of the joint body, so as to connect the PFA tube to the pipeline connection device. Although it can meet the requirements of firm connection, corrosion resistance and good sealing, the installation process is complicated and takes up space, which is not conducive to the rapid disassembly and assembly of the discharge pipeline. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the pipeline to be connected cannot be quickly disassembled and assembled.

[0006] To solve the above problems, one embodiment of the present invention provides a pipeline connection device, including a joint body, at least one radial seal and at least one pressing member, the joint body including: at least one pipe connection part, each pipe connection part having a through hole for communicating with a pipeline to be connected so as to allow fluid to pass through; and at least one limiting part, the limiting parts correspond to the pipe connection parts one by one, each limiting part is arranged around the outer periphery of the corresponding pipe connection part, and a groove is provided between the inner wall of the limiting part and the outer periphery of the pipe connection part, and the groove is used to accommodate the corresponding radial seal; wherein, when the pipeline connection device is connected to at least one pipeline to be connected, the first end of at least one pipeline to be connected is sleeved on the outer periphery of the corresponding pipe connection part, the corresponding radial seal is located between the inner wall of the limiting part and the outer periphery of the pipeline to be connected, and the corresponding pressing member is locked at the end of the limiting part facing the pipeline to be connected, and presses the radial seal along the axial direction of the pipeline to be connected, so that the inner wall of the radial seal and the outer periphery of the pipeline to be connected are interference fit to perform radial sealing.

[0007] The pipeline connection device provided by the present invention includes a joint body, at least one radial seal and at least one compression piece. When a pipeline to be connected is connected to the corresponding pipe connection part of the joint body, one end of the pipeline to be connected is sleeved on the outer periphery of the corresponding pipe connection part, and the corresponding radial seal is compressed by the corresponding compression piece, so that the inner wall of the radial seal and the outer periphery of the pipeline to be connected are interference fit to perform radial sealing. When it is necessary to disassemble the pipeline to be connected, first remove the corresponding compression piece, then apply force to pull the pipeline to be connected outward, and the pipeline to be connected will bring out the corresponding radial seal together to complete the disassembly. Therefore, the pipeline connection device not only has a simple installation process, but also facilitates the rapid disassembly and assembly of the pipeline to be connected.

[0008] Other features and corresponding beneficial effects of the present invention are described in the latter part of the specification, and it should be understood that at least part of the beneficial effects become obvious from the description in the specification of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional schematic diagram of a pipeline connection device according to an embodiment of the present invention;

[0010] Figure 2 It is a cross-sectional exploded schematic diagram of a pipe connection device according to an embodiment of the present invention;

[0011] Figure 3 It is a cross-sectional schematic diagram of a pipeline connection device according to an embodiment of the present invention;

[0012] Figure 4 It is a three-dimensional schematic diagram of a joint body of a pipe connection device according to an embodiment of the present invention;

[0013] Figure 5a A cross-sectional schematic diagram of a pipeline connection device according to an embodiment of the present invention when two pipelines to be connected are assembled;

[0014] Figure 5b A cross-sectional schematic diagram of a pipe connection device according to an embodiment of the present invention, in which two pipes to be connected are assembled and a mounting end is provided;

[0015] Figure 5c A cross-sectional schematic diagram of a pipe connection device according to an embodiment of the present invention, in which three pipes to be connected are assembled and a mounting end is provided; and

[0016] Figure 5d It is a top view schematic diagram of a pipeline connection device according to an embodiment of the present invention when four pipelines to be connected are assembled. DETAILED DESCRIPTION

[0017] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0018] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1 and Figure 2 , Figure 1 It shows a three-dimensional schematic diagram of the pipeline to be connected being assembled on the pipeline connection device; Figure 2 The schematic diagram of the cross-section of the pipeline connection device is shown, and the cutting line is as follows Figure 1 As shown by the cutting line UU in . The pipeline connection device proposed by the present invention includes a joint body 100, at least one radial seal 200 and at least one pressing member 300. The joint body 100 includes at least one pipe connection part 110 and at least one limiting part 120, each pipe connection part 110 has a through hole 1101 for communicating with a pipe to be connected 400 to allow fluid to pass through. At least one limiting part 120 corresponds to at least one pipe connection part 110 one by one, and each limiting part 120 is arranged around the outer periphery of the corresponding pipe connection part 110. A groove 130 is provided between the inner wall of the limiting part 120 and the outer periphery of the pipe connection part 110, and the groove 130 is used to accommodate the corresponding radial seal 200, and the corresponding radial seal 200 is pressed by the corresponding pressing member 300, so that the corresponding radial seal 200 and the pipe to be connected 400 sleeved on the outer periphery of the corresponding pipe connection part 110 are interference fit.

[0024] In some embodiments, Figure 2 As shown, the pipe connection device is used to assemble a pipe 400 to be connected, and the pipe connection device includes a joint body 100, a radial seal 200 and a clamp 300. The joint body 100 includes a pipe connection portion 110, a limit portion 120 and a mounting end 140. The pipe connection portion 110, the limit portion 120 and the mounting end 140 are integrally formed, wherein the groove 130 is defined by the pipe connection portion 110, the limit portion 120 and the mounting end 140. The mounting end 140 can be provided with an NPT (National (American) Pipe Thread, American standard 60-degree tapered pipe thread) threaded hole or flange, etc., so that the pipe connection device can be installed to other interfaces according to actual needs.

[0025] Figure 3 The schematic cross-sectional view of the pipeline to be connected is shown when it is assembled in the pipeline connection device, and the cutting line is as follows Figure 1 As shown by the cutting line UU in . The pipe to be connected 400 for assembly on the pipe connecting device has a first end 401, a middle section 402 and a second end 403 away from the pipe connecting device. The first end 401 of the pipe to be connected 400 is used to be sleeved on the outer periphery of the pipe connecting portion 110, the second end 403 of the pipe to be connected 400 is used to be connected to the waste liquid treatment end, and the middle section 402 of the pipe to be connected 400 is located between the first end 401 and the second end 403. The material of the pipe to be connected 400 is, for example, PFA (Polyfluoroalkoxy, soluble polytetrafluoroethylene). It can be understood by those skilled in the art that the PFA tube itself is elastic and can be deformed. When the pipe to be connected 400 is in an unassembled state, the inner diameters of the first end 401, the middle section 402 and the second end 403 of the pipe to be connected 400 are equal and are all smaller than the outer diameter of the pipe connecting portion 110.

[0026] When the pipe to be connected 400 is connected to the pipe connection portion 110 of the joint body 100, the first end 401 of the pipe to be connected 400 is deformed and sleeved on the outer periphery of the pipe connection portion 110 and inserted into the groove 130 (refer to Figure 2 ) bottom. The radial seal 200 is located between the inner wall of the limiting portion 120 and the outer periphery of the pipe to be connected 400, and the pressing member 300 is locked at the end 101 of the limiting portion 120 facing the pipe to be connected 400, and pushes the radial seal 200 to the bottom of the groove 130 along the axial direction of the pipe to be connected 400 and presses it. The radial seal 200 is elastic. When the radial seal 200 is pressed, it will be compressed and deformed, so that the inner wall of the radial seal 200 and the outer periphery of the first end 401 of the pipe to be connected 400 are interference fit to achieve radial sealing. The material of the radial seal 200 and the joint body 100 is, for example, PFA or PTFE (Polytetrafluoroethylene).

[0027] Furthermore, in some embodiments, Figure 3As shown, the inner wall of the radial seal 200 is provided with a convex ring 210, and the cross section of the convex ring 210 is in a pointed shape. When the pipeline 400 to be connected to the pipe connection part 110, the first end 401 of the pipeline 400 to be connected is deformed, so that the inner diameter and outer diameter of the first end 401 are changed. The inner diameter of the first end 401 of the pipeline 400 to be connected is expanded to a first inner diameter, and the first inner diameter is larger than the outer diameter of the pipe connection part 110. The outer diameter of the first end 401 of the pipeline 400 to be connected is expanded to a first outer diameter, and the first outer diameter is larger than the inner diameter of the convex ring 210, so that when the pipeline 400 to be connected is pulled out, the first end 401 can bring the radial seal 200 out together through the convex ring 210. The middle section 402 and the second end 403 of the pipeline 400 to be connected are not deformed, and the convex ring 210 is located at the outer periphery of the middle section 402 of the pipeline 400 to be connected. In other words, when the pipe 400 to be connected is assembled in the pipe connection device, the first outer diameter of the first end 401 of the pipe 400 to be connected>the inner diameter of the protruding ring 210>the outer diameter of the middle section 402 of the pipe 400 to be connected.

[0028] In some embodiments, the pressing member 300 is engaged with the limiting portion 120 of the connector body 100 to facilitate disassembly. Figure 2 and Figure 3 The outer wall of the pressing member 300 is provided with a protrusion 311, and the inner wall of the limiting part 120 is provided with a slot 102, and the protrusion 311 is adapted to the slot 102. The pressing member 300 is inserted into or withdrawn from between the limiting part 120 and the pipe 400 to be connected through the protrusion 311 and the slot 102. When the pressing member 300 is inserted between the limiting part 120 and the pipe 400 to be connected, it is locked at the end 101 of the limiting part 120, and the radial seal 200 is pressed into the groove 130 of the joint body 100 along the axial direction of the pipe 400 to be connected, so that the radial seal 200 and the pipe 400 to be connected are interference-fitted for radial sealing, and the installation process is simple and the overall space occupied is small.

[0029] The present application does not limit the specific structure of the card slot 102. Figure 2 and Figure 4 In some embodiments, the slot 102 of the inner wall of the limiting portion 120 includes a first slot 121 and a second slot 122, the first slot 121 extends along the circumference of the limiting portion 120, and the second slot 122 extends from the limiting portion 120 toward the end 101 of the pipe 400 to be connected to the first slot 121 along the axial direction of the limiting portion 120. The outer wall of the pressing member 300 has one or more protrusions 311, and the number of the second slots 122 is the same as the number of the protrusions 311. When there are multiple protrusions 311, there are also multiple second slots 122. The multiple second slots 122 are spaced apart along the circumference of the limiting portion 120. In some embodiments, the multiple second slots 122 are spaced apart from each other at equal intervals. In other embodiments, the multiple second slots 122 may be spaced apart from each other at different intervals.

[0030] According to the above embodiment, during the assembly process of the clamping member 300 being locked in the end 101 of the limiting portion 120 toward the pipe 400 to be connected, the plurality of protrusions 311 of the clamping member 300 are first aligned with the plurality of second grooves 122 respectively, and slid from the plurality of second grooves 122 into the first groove 121, so that the plurality of protrusions 311 are engaged with the first groove 121. Then, the clamping member 300 is rotated, and the plurality of protrusions 311 rotate in the first groove 121 along the circumference of the limiting portion 120, so that the plurality of protrusions 311 are staggered with the plurality of second grooves 122 respectively, and the protrusions 311 in the first groove 121 are located at the positions of two adjacent second grooves 122, so as to achieve the purpose of locking the clamping member 300 in the end 101 of the limiting portion 120. When it is necessary to pull out the pipe 400 to be connected, first rotate the clamping member 300 so that the multiple protrusions 311 are aligned with the multiple second grooves 122 respectively, then pull out the clamping member 300, and finally pull out the pipe 400 to be connected, thereby realizing the rapid disassembly of the pipe 400 to be connected.

[0031] In some embodiments, in combination Figure 2 and Figure 3 The pressing member 300 includes a pressing portion 310 and an end face sealing portion 320. The outer diameter of the end face sealing portion 320 is larger than the outer diameter of the pressing portion 310. The cross-sections of the pressing portion 310 and the end face sealing portion 320 form an "L" shape. The pressing portion 310 is used to press the radial seal 200 along the axial direction of the pipe 400 to be connected. The pressing portion 310 is provided with the above-mentioned multiple protrusions 311. When the protrusion 311 enters the first groove 121 from the second groove 122, the end face sealing portion 320 is pressed against the end 101 of the limiting portion 120 facing the pipe 400 to be connected. The material of the pressing member 300 can be PFA or PTFE.

[0032] In some embodiments, the pipe connection device is used to assemble two pipes to be connected. Figure 5a As shown, the structures at both ends of the pipe connection device are symmetrical. Figure 5a The two ends of the joint body 100 of the pipeline connection device are respectively marked as end A and end B, and the end A and end B of the joint body 100 are respectively configured with a pipe connection part 110, a limiting part 120, a radial sealing member 200 and a pressing member 300 of the same structure.

[0033] The A end and the B end of the joint body 100 have a pipe connection part 110 and a limiting part 120 with the same structure. The pipe connection part 110 at the A end is used to connect the first pipe to be connected 410, and the pipe connection part 110 at the B end is used to connect the second pipe to be connected 420. The specific connection method is the same as the method of connecting the pipe to be connected 400 and the pipe connection part 110 described above, and will not be repeated here.

[0034] Furthermore, if Figure 5bAs shown, when the pipeline connection device connects two pipelines 410 and 420 to be connected, a mounting end 140 can also be provided. Figure 5b The three ends of the joint body 100 of the pipe connection device are respectively marked as end A, end B and end C. The end A and end B of the joint body 100 respectively have a pipe connection portion 110 and a stop portion 120 of the same structure. The end C of the joint body 100 is a mounting end 140, which is provided with an NPT threaded hole or a flange for mounting the pipe connection device to other interfaces. Figure 5b As shown, the C end is located in the middle of the connector body 100 and is open upward.

[0035] In other embodiments, Figure 5c As shown, the pipeline connection device can also be used to assemble three pipelines 410, 420, 430 to be connected. The pipeline connection device includes a joint body 100, three radial seals 200 and three compression members 300. The joint body 100 includes three pipe connection parts 110, three stopper parts 120 and a mounting end 140. Figure 5a In the figure, the four ends of the joint body 100 of the pipe connecting device are respectively marked as end A, end B, end C and end D. The A end, end B and end C of the joint body 100 are respectively configured with a pipe connecting part 110, a limiting part 120, a radial seal 200 and a clamping part 300 of the same structure. The D end is the installation end 140, which is provided with an NPT threaded hole or a flange for installing the pipe connecting device to other interfaces.

[0036] The A end, B end and C end of the joint body 100 respectively have a pipe connection part 110 and a limiting part 120 of the same structure. The pipe connection part 110 at the A end is used to connect the first pipeline 410 to be connected, the pipe connection part 110 at the B end is used to connect the second pipeline 420 to be connected, and the pipe connection part 110 at the C end is used to connect the third pipeline 430. The specific connection method is the same as the method of connecting the pipeline 400 to be connected and the pipe connection part 110 described above, and will not be repeated here.

[0037] In other embodiments, the pipeline connection device can also be used to assemble more than three pipelines to be connected. Figure 5d As shown, the pipe connection device connector body 100 can be connected to four pipes to be connected 410, 420, 430, 440. The structure of the pipe connection device and the assembly process with the pipes to be connected are the same as the structure of the pipe connection device and the assembly process with the pipes to be connected 400 described above, and will not be repeated here.

[0038] The following is an example of assembling a pipeline to be connected with a pipeline connection device. Figure 2 and Figure 3 , explaining the assembly process of the pipe connection device and a pipe to be connected:

[0039] Step S1: sequentially sleeve the pressing member 300 and the radial sealing member 200 on the outer circumference of the pipeline 400 to be connected.

[0040] Step S2: insert the first end 401 of the pipe 400 to be connected into the groove 130 of the joint body 100 , and sleeve it around the outer periphery of the pipe connection portion 110 of the joint body 100 after deformation.

[0041] Step S3: Align the protrusion 311 on the outer wall of the pressing member 300 with the second groove 122, press the pressing member 300, and push the pressing member 300 into the gap between the pipeline 400 to be connected and the limiting portion 120 until the protrusion 311 enters the first groove 121, the pressing member 300 is locked at the end 101 of the limiting portion 120, and the radial seal 200 is pressed along the axial direction of the pipeline 400 to be connected. At this time, the inner wall of the radial seal 200 is interference fit with the outer periphery of the deformed first end 401 of the pipeline 400 to be connected. Among them, the inner diameter of the protrusion 210 on the inner wall of the radial seal 200 is smaller than the outer diameter of the pipeline of the deformed first end 401 (i.e., the first outer diameter mentioned above).

[0042] Step S4 : rotating the pressing member 300 so that the protrusion 311 is offset from the second groove 122 .

[0043] Step S5: completing the assembly between the pipeline 400 to be connected and the pipeline connecting device.

[0044] Step S6: When it is necessary to remove the pipeline 400 to be connected from the pipeline connection device, the pressing member 300 is first rotated so that the protrusion 311 is aligned with the second groove 122 of the limiting portion 120 to pull out the pressing member 300.

[0045] Step S7: After pulling out the pressing member 300 , force is applied to pull out the pipe 400 to be connected. Due to the effect of the convex ring 210 , the pipe 400 to be connected can be pulled out together with the radial sealing member 200 .

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipeline connection device, characterized in that: The invention comprises a joint body, at least one radial seal and at least one pressing member, wherein the joint body comprises: at least one pipe connection portion, each of the pipe connection portions having a through hole for communicating with a pipe to be connected so as to allow fluid to pass through; and At least one limiting portion, each limiting portion corresponds to the pipe connection portion one by one, each limiting portion is arranged around the outer periphery of the corresponding pipe connection portion, and a groove is provided between the inner wall of the limiting portion and the outer periphery of the pipe connection portion, and the groove is used to accommodate the corresponding radial seal; Among them, when the pipeline connecting device is connected to at least one pipeline to be connected, the first end of the at least one pipeline to be connected is sleeved on the outer periphery of the corresponding pipe connecting part, the corresponding radial seal is located between the inner wall of the limiting part and the outer periphery of the pipeline to be connected, and the corresponding clamping part is locked at the end of the limiting part facing the pipeline to be connected, and the radial seal is pressed along the axial direction of the pipeline to be connected, so that the inner wall of the radial seal and the outer periphery of the pipeline to be connected are interference fit to perform radial sealing.

2. The pipe connection device according to claim 1, characterized in that: The at least one radial seal is elastic.

3. The pipe connection device according to claim 1, characterized in that: The inner wall of each radial seal is provided with a convex ring. When the first end of a pipe to be connected is sleeved on the outer periphery of the corresponding pipe connection part, the outer diameter of the first end of the pipe to be connected is expanded to a first outer diameter, which is larger than the inner diameter of the convex ring.

4. The pipeline connection device according to claim 3, characterized in that: Each of the pipelines to be connected includes the first end, a middle section and a second end away from the pipeline connecting device, wherein the middle section is located between the first end and the second end, and when the first end of a pipeline to be connected is sleeved on the outer periphery of the corresponding pipe connecting portion, the inner diameter of the convex ring is larger than the outer diameter of the middle section of the pipeline to be connected.

5. The pipeline connection device according to claim 1, characterized in that: The at least one pressing member is clamped with the corresponding limiting portion.

6. The pipeline connection device according to claim 5, characterized in that: The outer wall of each pressing member is provided with a protrusion, and the inner wall of the corresponding limiting portion is provided with a clamping groove, and the protrusion is adapted to the clamping groove.

7. The pipeline connection device according to claim 6, characterized in that: The clamping slot includes a first slot and a second slot, wherein the first slot extends along the circumferential direction of the limiting portion, and the second slot extends along the axial direction of the limiting portion from the limiting portion toward the end of the pipe to be connected to the first slot; In which, during the assembly process in which the corresponding clamping piece is locked in the limiting portion toward the end of the pipe to be connected, the protrusion of the clamping piece enters the first groove along the second groove and rotates in the first groove along the circumference of the limiting portion, so that the protrusion is engaged with the first groove and staggered with the second groove.

8. The pipeline connection device according to claim 1, characterized in that: Each clamping member includes a clamping portion and an end face sealing portion, the outer diameter of the end face sealing portion is larger than the outer diameter of the clamping portion, and the clamping member abuts against the corresponding limiting portion toward the end of the pipe to be connected through the end face sealing portion.

9. The pipeline connection device according to claim 1, characterized in that: The joint body also includes a mounting end, and the mounting end is provided with an NPT threaded hole or a flange for mounting the pipeline connecting device to other interfaces.

10. The pipeline connection device according to claim 1, characterized in that: The material of the pipeline connecting device is PFA or PTFE.

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