Device for sleeving, fixing and medium filling of double-layer pipe before bending

Abstract

The invention discloses a sleeving, fixing and medium filling device for a double-layer pipe before bending. The sleeving, fixing and medium filling device comprises a fixed sleeve A, a sealing ring A, a positioning seat, a sealing ring B and a fixed sleeve B, sealing between the device and the outer circle of the inner pipe and the outer circle of the outer pipe is achieved through a sealing ring structure, medium filling equipment is connected through a quick-release connector, and then the requirements for complete positioning and medium filling of a sleeve before the double-layer pipe is bent are met according to the respective assembling and matching relation of all unit assemblies. The inner pipe and the outer pipe of the sleeved double-layer pipe are coaxially fixed, and the gap between the inner pipe and the outer pipe of the double-layer pipe is rapidly and stably filled with process media. And the problems of non-concentricity, medium filling leakage, non-uniform and unstable filling and the like after the double-layer pipe is sleeved are solved. The device can be widely used for sleeve positioning and gap medium filling of similar double-layer pipes, the innovative design of the device not only solves the problems that after the double-layer pipes are sleeved, the double-layer pipes are not concentric, medium filling leaks, and filling is uneven and unstable, but also provides a solution for positioning of similar structures and medium filling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of auxiliary tool for aviation pipeline double-layer sleeve bending preparation, in particular to a device for pre-bending sleeve fixing and medium filling of double-layer pipe. BACKGROUND

[0002] The double-layer pipe comprises an inner pipe, an outer pipe and a supporting isolation material therebetween. The double-layer pipe is mainly used for conveying fuel, toxic and harmful medium, drinking water, sewage, etc. The outer pipe can serve as an insurance when the inner pipe leaks or fails.

[0003] Due to the structure of the double-layer pipe, the positioning and fixing of the inner and outer pipes are not good when the double-layer pipe is sleeved and processed, which can easily lead to uneven gap between the inner and outer pipes of the finished pipe, affecting the use effect. When the double-layer pipe is bent, the bending die can only clamp the outer pipe and support the inner pipe, which leads to the lack of effective internal support for the outer pipe and the lack of effective external clamping for the inner pipe during the bending of the double-layer pipe. The conventional method is to fill low-melting-point medium into the gap between the inner and outer pipes, but the conventional method is easy to produce cavities and bubbles when filling the medium, affecting the bending processing quality of the double-layer pipe. SUMMARY

[0004] The present application provides a device for pre-bending sleeve fixing and medium filling of double-layer pipe, comprising a fixed sleeve A, a sealing ring A, a positioning seat, a sealing ring B, a fixed sleeve B; the positioning seat is a reverse T-shaped hollow structure, one end of the horizontal direction and the axial direction is provided with a large-end locking claw, the other end is provided with a small-end locking claw, at least two axial split grooves are arranged on the locking claw, a guide slope is arranged on the inner side of the front end of the locking claw, threads are arranged on the outer side of the locking claw, the large-end locking claw is fixedly connected with the inner thread of the fixed sleeve A, the small-end locking claw is fixedly connected with the inner thread of the fixed sleeve B, a channel is arranged on the vertical direction of the positioning seat and is communicated with the horizontal direction inner cavity, the horizontal direction inner cavity of the positioning seat is a coaxial three-step column, the inner diameter decreases from the large-end locking claw to the small-end locking claw, the maximum inner diameter matches the outer diameter of the outer pipe, the minimum inner diameter matches the outer diameter of the inner pipe, the side surface of the root of the maximum inner diameter of the positioning seat inner cavity is a limiting end surface for limiting the outer pipe, the inner side of the positioning seat is provided with a ring groove one for placing the sealing ring A and sealingly connecting with the outer pipe, the inner side of the positioning seat is provided with a ring groove two for placing the sealing ring B and sealingly connecting with the inner pipe. Further, the angle a between the guide slope and the horizontal direction axis is less than or equal to 10°, which can prevent the pipe from being scratched when it is clamped as required, and the front end of the locking claw will not cause pressure injury to the clamped pipe when the locking claw is pressed.

[0005] Further, the outer side of the locking claw is provided with a buffer groove at the root of the axial split groove, which can reduce the torque required for clamping and loosening the locking claw.

[0006] Furthermore, the outer sides of the large and small end locking claws have claw conical surfaces that mate with the inner conical surfaces of the fixed sleeve A and fixed sleeve B, and conical threads are provided on the conical surfaces for locking the claws.

[0007] The positioning seat medium filling interface adopts a steel ball lock quick-change interface, which realizes quick connection or disconnection between the device and the medium filling equipment.

[0008] By utilizing the coaxial stepped hole of the positioning fixture and the locking structure of the pipe thread tightening claw, the freedom of each unit component after the inner and outer tubes are assembled is restricted. The sealing ring structure achieves the sealing between the device and the outer circle of the inner and outer tubes. The quick-release connector can be quickly connected to the medium filling equipment. Based on the assembly and matching relationship of each unit component, the device can achieve complete positioning of the double-layer tube before bending and efficient and stable medium filling.

[0009] The double-layered tubes are placed vertically and connected to the media filling equipment through the channel interface of the positioning seat. The media filling equipment injects a low-melting-point medium into the positioning seat in the direction of counter-gravity. Sealing ring A forms a sealing pair with the outer surface of the outer tube, and sealing ring B forms a sealing pair with the outer surface of the inner tube. The low-melting-point medium is injected into the gap between the inner and outer tubes in the direction of counter-gravity. At the same time as the medium is injected, air in the gap is expelled, reducing the generation of cavities and bubbles, until the gap between the inner and outer tubes is filled.

[0010] The beneficial effects of this invention are: This device not only achieves the positioning and fixation of the inner and outer double-layer tube sets, but also allows for quick connection with media filling equipment via quick-release couplings, ensuring high efficiency and stability in media filling. It can be widely used for the mounting, positioning, and fixing of inner and outer tubes in double-layer tube structures, as well as for filling gaps with media. Its innovative design not only solves the problems of misalignment after mounting double-layer tubes and leakage, uneven filling, and instability of media, but also provides a solution for the positioning and media filling of similar structures. Attached Figure Description

[0011] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0012] Figure 1 This is a schematic diagram of the structure of the device for fixing and filling a double-layer tube before bending, provided by the present invention, which is equipped with a double tube. Figure 2 A perspective view of the device for fixing and filling a double-layer tube before bending, provided by the present invention, showing the double tubes. Figure 3This is a schematic diagram of the positioning seat equipped with a double tube provided by the present invention; Figure 4 A schematic diagram of the positioning seat provided by the present invention; Figure 5 A perspective view of the positioning seat provided for the invention; Wherein: 1-Fixing sleeve A, 2-Sealing ring A, 3-Positioning seat, 4-Sealing ring B, 5-Fixing sleeve B, 301-Large end locking claw, 302-Axial groove, 303-Guide slope, 304-Buffer groove, 305-Channel, 306-Limiting end face, 307-Annular groove one, 308-Annular groove two, 309-Small end locking claw, α-Guide slope. Detailed Implementation

[0013] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the invention will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0014] Please see Figures 1-5 The figure shows a schematic diagram of the device for fixing and filling a double-layer pipe before bending, provided by the present invention. It includes a fixing sleeve A1, a sealing ring A2, a positioning seat 3, a sealing ring B4, and a fixing sleeve B5. The positioning seat 3 has an inverted T-shaped hollow structure. A large-end locking claw 301 is provided at one end of the horizontal axis, and a small-end locking claw 309 is provided at the other end. Both the large-end locking claw 301 and the small-end locking claw 309 have at least two axial grooves 302. Guide slopes 303 are provided on the inner sides of the front ends of both the large-end locking claw 301 and the small-end locking claw 309. The outer side of the large-end locking claw 301 is threaded to engage with the internal thread of the fixing sleeve A1 for a fixed connection. The outer side of the small-end locking claw 309 is threaded to engage with the fixing sleeve A1 for a fixed connection. The B5 internal thread provides a fixed connection. The positioning seat 3 has a vertical channel 305 that communicates with the horizontal inner cavity. The horizontal inner cavity of the positioning seat 3 is a coaxial three-step column shape, in which the inner diameter decreases sequentially from the large end locking claw 301 to the small end locking claw 309. The maximum inner diameter matches the outer diameter of the outer tube 7, and the minimum inner diameter matches the outer diameter of the inner tube 6. The side of the root of the maximum inner diameter of the positioning seat 3 is a limiting end face 306 to limit the outer tube 7. The inner side of the positioning seat 3 is provided with an annular groove 307 at the connection between the outer tube 7 and the inner side of the positioning seat 3 to place the sealing ring A 2 for sealing connection with the outer tube 7. The inner side of the positioning seat 3 is provided with an annular groove 308 at the connection between the inner side of the positioning seat 3 and the inner tube 6 to place the sealing ring B 4 for sealing connection with the inner tube 6.

[0015] The guide slope α of the guide slope 303 is less than or equal to 10°, so that the pipe to be clamped will not be scratched when it is inserted into the chuck, and the front end of the chuck will not cause crush damage to the clamped pipe when the chuck is pressed.

[0016] Both the large-end locking claw 301 and the small-end locking claw 309 have buffer grooves 304 located at the root of the axial groove 302 on their outer sides, which reduces the torque required for the claws to clamp and loosen.

[0017] Both the large-end locking claw 301 and the small-end locking claw 309 have claw conical surfaces on their outer sides that mate with the inner conical surfaces of the fixed sleeve A1 and the fixed sleeve B5, and conical threads are provided on the conical surfaces for locking the claws.

[0018] The channel 305 port of the positioning seat 3 adopts a steel ball lock quick-change interface, which realizes the quick connection or disconnection of the device and the media filling equipment.

[0019] When assembling the double-layer tubes, the inner tube 6 is passed through the fixed sleeve A1, positioning seat 3, and fixed sleeve B5 in sequence from the side of the fixed sleeve A1. The fixed sleeve B5 is then tightened with the corresponding outer conical thread of the positioning seat 3 through the pipe thread on the inner conical surface, thereby pushing the locking claw structure 309 at the small end of the positioning seat 3 to lock the inner tube 6. The outer tube 7 is then fitted onto the outside of the inner tube 6, passing through the fixed sleeve A1 and positioned at the inner limiting end face 306 of the positioning seat 3. The fixed sleeve A1 is then tightened with the corresponding outer conical thread of the positioning seat 3 through the pipe thread on the inner conical surface, thereby pushing the locking claw structure 301 at the large end of the positioning seat 3 to lock the outer tube 7. This achieves the positioning and fixing of the double-layer tube before bending. The assembled double-layer tube is rotated 90° and placed vertically. It is then connected to the medium filling equipment through the interface of the channel 305 of the positioning seat in the double-layer tube. The medium filling equipment injects a low-melting-point medium into the positioning seat 3 in the opposite direction of gravity. The sealing ring A2 forms a sealing pair with the outer surface of the outer tube 7, and the sealing ring B4 forms a sealing pair with the outer surface of the inner tube 6. The low melting point medium is injected into the gap between the inner and outer tubes along the anti-gravity direction. At the same time as the medium is injected, the air in the gap is pushed out, reducing the generation of cavities and bubbles, until the gap between the inner and outer tubes is filled.

[0020] The positioning fixture utilizes a coaxial stepped hole and a threaded clamping jaw to restrict the freedom of each unit component after the inner and outer tubes are assembled. The positioning seat tightens or loosens by engaging the pipe thread on the conical surface of the jaw with the pipe thread on the inner conical surface of the corresponding fixed sleeve, thus clamping and releasing the guide tube. A sealing ring structure ensures a seal between the device and the outer circumference of the inner and outer tubes. A quick-release connector allows for rapid connection to the media filling equipment. Based on the assembly and mating relationships of each unit component, the device achieves complete positioning before bending of the double-layer tubes and efficient and stable media filling. The positioning seat has a media filling interface in the middle, enabling it to both fix and lock the inner and outer guide tubes and perform media filling. The media filling interface uses a steel ball locking quick-change interface, allowing for quick connection or disconnection between the device and the media filling equipment.

[0021] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, are all covered within the scope of the claims of the present invention.

Claims

1. A device for pre-bending and fixing of double-layer tubes and for filling with a medium, characterized in that: The device includes a fixed sleeve A (1), a sealing ring A (2), a positioning seat (3), a sealing ring B (4), and a fixed sleeve B (5). The positioning seat (3) has an inverted T-shaped hollow structure. One end of the horizontally coaxial device is provided with a large-end locking claw (301), and the other end is provided with a small-end locking claw (309). Both the large-end locking claw (301) and the small-end locking claw (309) are provided with at least two axial grooves (302). The inner side of the front end of both the large-end locking claw (301) and the small-end locking claw (309) is provided with a guide slope (303). The outer side of the large-end locking claw (301) is provided with a thread that engages with the internal thread of the fixed sleeve A (1) for fixed connection. The outer side of the small-end locking claw (309) is provided with a thread that engages with the internal thread of the fixed sleeve B (5) for fixed connection. The positioning seat (3) has a vertical channel (305) that communicates with the horizontal inner cavity. The horizontal inner cavity of the positioning seat (3) is a coaxial three-step column. The inner diameter decreases sequentially from the large end locking claw (301) to the small end locking claw (309). The maximum inner diameter matches the outer diameter of the outer tube (7), and the minimum inner diameter matches the outer diameter of the inner tube (6). The side of the root of the maximum inner diameter of the positioning seat (3) is a limiting end face (306) that limits the outer tube (7). The inner side of the positioning seat (3) and the outer tube (7) are provided with an annular groove 1 (307) to place the sealing ring A (2) and seal it with the outer tube (7). The inner side of the positioning seat (3) and the inner tube (6) are provided with an annular groove 2 (308) to place the sealing ring B (4) and seal it with the inner tube (6).

2. The device for pre-bending fixing and medium filling of a double-layer tube according to claim 1, characterized in that: The guide slope (303) has a guide slope angle α less than or equal to 10°.

3. The device for pre-bending fixing and media filling of a double-layer tube according to claim 1, characterized in that: Both the large-end locking claw (301) and the small-end locking claw (309) have buffer grooves (304) located at the root of the axial groove (302) on their outer sides.

4. The device for pre-bending and fixing of double-layer tubes and for filling with media according to claim 1, characterized in that: Both the large-end locking claw (301) and the small-end locking claw (309) have claw conical surfaces on their outer sides that mate with the inner conical surfaces of the fixed sleeve A (1) and the fixed sleeve B (5), and conical threads are provided on the conical surfaces for locking the claws.

5. The device for pre-bending and fixing of double-layer tubes and for filling with media according to claim 1, characterized in that: The channel (305) port of the positioning seat (3) adopts a steel ball lock quick-change interface.

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