Easily leak-detecting composite pipe connecting structure

Abstract

The utility model relates to the technical field of plastic composite pipe connection, in particular to a composite pipe connecting structure easy to leak, which comprises an adapting pipe, a composite connecting pipe hermetically connected with two ends of the adapting pipe and a leak detection device. The leak detection device is installed on the outer wall of the joint of the adapting pipe and the composite connecting pipe and wraps the outer wall of the joint, the leak detection device comprises an outer frame, a water absorption piece and a sliding piece, the sliding piece and the water absorption piece are both installed on the inner wall of the outer frame, the sliding piece is in sliding connection with the outer frame, the water absorption piece abuts against the sliding piece, and the water absorption piece abuts against the sliding piece. After absorbing water, the water absorbing piece can expand and extrude and push the sliding piece to extend out of the outer frame in a sliding manner. According to the utility model, when slight water leakage occurs at the joint of the composite pipe, the connecting structure can make an obvious prompt action, so that a worker can conveniently find the water leakage problem.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic composite pipe connection, and more specifically, to a composite pipe connection structure that is easy to detect leaks. Background Technology

[0002] Steel wire mesh reinforced plastic composite pipe is an improved new type of steel-reinforced plastic composite pipe, also known as SRTP pipe. This type of pipe currently uses a high-strength, over-plasticized steel wire mesh skeleton and thermoplastic polyethylene as raw materials. The steel wire mesh serves as the skeleton reinforcement of the polyethylene plastic pipe, with high-density polyethylene (HDPE) as the matrix. High-performance HDPE modified bonding resin is used to tightly connect the steel wire skeleton with the inner and outer layers of high-density polyethylene, giving it excellent composite properties. It possesses strength, rigidity, and impact resistance exceeding that of ordinary pure plastic pipes, making it suitable for long-distance buried water supply pipeline systems.

[0003] When a slight leak occurs at the connection point of the two pipes in the aforementioned composite pipe, or when the leak is located in a relatively hidden place, it is difficult for workers to detect the leak in time and replace or repair the pipe. Utility Model Content

[0004] The purpose of this invention is to overcome the difficulty for workers to detect minor leaks in existing composite pipes. It provides a plastic composite pipe connection structure that can provide a clear indication when a minor leak occurs at the connection point, making it easier for workers to detect the leak.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A leak-detectable composite pipe connection structure is provided, including a receiving pipe and a composite connecting pipe sealed to both ends of the receiving pipe, and a leak detection device. The leak detection device is installed on the outer wall of the joint between the receiving pipe and the composite connecting pipe and covers the outer wall of the joint. The leak detection device includes an outer frame, a water-absorbing component, and a sliding component. The sliding component and the water-absorbing component are both installed on the inner wall of the outer frame. The sliding component is slidably connected to the outer frame. The water-absorbing component abuts against the sliding component. After absorbing water, the water-absorbing component can expand and squeeze to push the sliding component to slide out to the outside of the outer frame.

[0007] In the above-described process, the leak detection device is first assembled. The absorber and sliding component are installed inside the inner wall of the outer frame, and it is confirmed that the sliding component can slide easily within the outer frame. After assembly, the entire leak detection device is fitted over the receiving pipe. Then, the receiving pipe and the composite connecting pipe are connected, and the connection joint is sealed. After connection, the position of the sliding component within the outer frame is adjusted so that the absorber can completely cover the connection joint between the receiving pipe and the composite connecting pipe. When a leak occurs at any point in the connection, the absorber will continuously absorb water and expand due to the continuous leakage. The expansion of the absorber will compress and push the sliding component, causing it to extend beyond the outer frame. When workers observe this obvious movement of the sliding component extending beyond the outer frame, it indicates that a leak has occurred at that connection and pipe maintenance is required. Even if there is a minor leak at the connection, or the leak is in a hidden location, the leak detection device can still provide a clear indication to workers that pipe leak repair is necessary.

[0008] Furthermore, the sliding component includes a sliding plate and a prompting rod. The prompting rod is fixedly connected to the side of the sliding plate. One end face of the water-absorbing component abuts against the sliding plate. The sliding plate is slidably connected to the outer frame. A sliding through hole is provided on the side of the outer frame. The prompting rod is inserted into the sliding through hole. After the water-absorbing component absorbs water and expands, the sliding plate slides, causing the prompting rod to extend out of the sliding through hole. The prompting rod is mainly for prompting purposes. When the water-absorbing component expands, the prompting rod on the sliding component slides out of the sliding through hole of the outer frame, while the side wall of the sliding plate abuts against the inner side wall of the outer frame to prevent the entire sliding component from sliding out of the outer frame.

[0009] Furthermore, it also includes a receiving device detachably connected to the receiving pipe and the composite connecting pipe. The receiving device includes receiving rings located at both ends along the axial direction of the outer frame. An elastic part is also provided on the side of the sliding plate away from the indicator rod. A support through hole is provided on the water-absorbing component. One end of the elastic part is fixedly connected to the end face of the sliding plate, and the other end passes through the support through hole and out of the outer frame and is fixedly connected to the receiving ring. The function of the elastic part is to control the entire sliding component. The elastic part is a kind of elastic pull rope. The sliding component has a certain sliding space in the outer frame and can slide freely in the outer frame along the axial direction of the receiving pipe. When the pipe does not leak, the indicator rod of the sliding component may accidentally slide out of the outer frame due to external force. The elastic part can apply elastic force to the sliding component to hold it in place when the pipe does not leak and the water-absorbing component does not absorb water and expand, thus preventing the indicator rod from sliding out of the outer frame.

[0010] Furthermore, it also includes positioning sleeves respectively installed on the outer walls of the composite connecting pipe and the receiving pipe and abutting against the two end side walls of the outer frame. Positioning protrusions are respectively provided on the outer walls of the composite connecting pipe and the receiving pipe, and positioning grooves are provided on the inner walls of the positioning sleeves. The positioning protrusions are inserted into the positioning grooves. The function of the positioning sleeves is to fix the outer frame axially, preventing the entire outer frame from moving axially. If the outer frame moves axially, the absorbent may not accurately cover the connection between the receiving pipe and the composite connecting pipe. When the positioning protrusion is inserted into the positioning groove, the position of the entire outer frame in the axial direction of the pipe can be fixed. The absorbent occupies most of the space inside the outer frame, thus covering the entire connection. The circumferential direction of the outer frame does not need to be fixed, because the circumferential rotation of the outer frame does not affect the normal operation of the internal absorbent and sliding components.

[0011] Furthermore, the positioning sleeve is semi-circular in shape and has a mating part. When the positioning sleeve is installed on the outer wall of the composite connecting pipe and the receiving pipe, the mating parts on the two positioning sleeves are fixedly connected. The positioning sleeve needs to be installed on the receiving pipe and the composite connecting pipe, but the outer wall of the receiving pipe and the composite connecting pipe has a positioning protrusion. The positioning sleeve cannot pass through the positioning protrusion. By setting the positioning sleeve to be semi-circular, during installation, the two semi-circular rings are respectively installed on the outer wall of the pipe and spliced ​​into a complete ring through the fixed connection of the mating part. The positioning protrusion can be smoothly inserted into the positioning groove. The installation method is reasonable and convenient.

[0012] Furthermore, the positioning sleeve includes a positioning outer part and a receiving part. A positioning post is provided on the inner wall of the positioning outer part, and a positioning through hole is provided on the outer wall of the receiving part. The outer wall of the receiving part is fitted and installed against the inner wall of the positioning outer part. The outer wall surface of the positioning post and the inner wall surface of the positioning through hole form the positioning groove. The positioning sleeve is divided into a positioning outer part and a receiving part. The function of the receiving part is to buffer the pressure between the positioning outer part and the receiving pipe or composite connecting pipe. After the positioning post is inserted into the positioning through hole, it can axially fix the receiving part.

[0013] Furthermore, the positioning protrusion is in the form of a circular cylindrical component. When the positioning protrusion is inserted into the positioning groove, the positioning post is inserted into the cylindrical body of the positioning protrusion. Both the positioning protrusion and the positioning post are solid protrusions. After the positioning post is inserted into the positioning through hole, there is a suitable gap between the outer wall surface of the positioning post and the inner wall surface of the positioning through hole to form a positioning groove. The positioning protrusion can then be inserted into the positioning groove, allowing the positioning protrusion, the positioning sleeve, and the receiving component to be properly connected.

[0014] Furthermore, the receiving device also includes a pull rod, and the receiving ring is provided with a sleeve joint. The pull rod passes through the sleeve joints on the two receiving rings and is connected to the sleeve joints. The pull rod passes through the sleeve joints to improve the connection strength at the connection between the receiving pipe and the composite connecting pipe and avoid damage from external forces.

[0015] Furthermore, the pull rod is threadedly connected to the sleeve joint, and the receiving pipe and the composite connecting pipe adopt an insertion connection installation. The receiving pipe and the composite connecting pipe generally have a large friction force. The pull rod rotates in the sleeve joint, which can drive the two receiving rings to move closer to each other, so that the receiving pipe and the composite connecting pipe can be smoothly inserted.

[0016] Furthermore, it also includes a sealing element, through which the receiving pipe and the composite connecting pipe are sealed together. The sealing element is a sealant or sealing ring that can seal the connection between the receiving pipe and the composite connecting pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The leak detection device is installed at the junction of the connector pipe and the composite connecting pipe. The device includes an outer frame, a water-absorbing component, and a sliding component. Both the sliding component and the water-absorbing component are installed on the inner wall of the outer frame. The sliding component is slidably connected to the outer frame, and the water-absorbing component abuts against the sliding component. After absorbing water, the water-absorbing component expands and pushes the sliding component to extend outside the outer frame. When workers observe this obvious movement of the sliding component extending outside the outer frame, it indicates a leak at that connection, requiring pipe maintenance. Even if there is a minor leak at the connection, or the leak is in a hidden location, the leak detection device can still provide a clear indication to workers that pipe leak repair is necessary.

[0019] 2. The receiving device also includes a tie rod, and the receiving ring is equipped with a sleeve joint. During installation, the tie rod and the sleeve joint are threaded together to improve the connection strength at the joint between the receiving pipe and the composite connecting pipe, and to prevent damage from external forces. At the same time, it can also drive the two receiving rings to move closer to each other, so that the receiving pipe and the composite connecting pipe can be smoothly inserted. Attached Figure Description

[0020] Figure 1 A three-dimensional diagram of a composite pipe connection structure that is easy to detect leaks;

[0021] Figure 2 A schematic diagram of a combined structure of a leak detection device and a receiving device for an easy-to-detect composite pipe connection structure;

[0022] Figure 3 This is a schematic diagram of the internal structure of a leak-detectable composite pipe connection structure.

[0023] Figure 4A schematic diagram of the positioning sleeve in the installation state of an easily leak-detectable composite pipe connection structure;

[0024] Figure 5 A composite pipe connection structure that is easy to detect leaks Figure 4 A magnified view of a section at point A in the middle;

[0025] Figure 6 A schematic diagram of a water-absorbing component with an easily leak-detectable composite pipe connection structure;

[0026] Figure 7 This is a schematic diagram of the positioning component of a composite pipe connection structure that is easy to detect leaks.

[0027] In the attached diagram: 100, receiving pipe; 200, composite connecting pipe; 300, leak detection device; 310, outer frame; 311, sliding through hole; 320, water absorption component; 321, support through hole; 330, sliding component; 331, sliding plate; 332, indicator rod; 333, elastic part; 400, receiving device; 410, receiving ring; 411, sleeve joint; 420, pull rod; 500, positioning sleeve; 510, positioning groove; 520, positioning outer part; 521, mating part; 522, positioning post; 530, receiving component; 531, positioning through hole; 600, positioning protrusion; 700, sealing component. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Example 1

[0031] This embodiment is the first embodiment of an easily leak-detectable composite pipe connection structure, such as... Figures 1 to 3As shown, the device includes a receiving pipe 100 and a composite connecting pipe 200 that is sealed to both ends of the receiving pipe 100. It also includes a leak detection device 300. The leak detection device 300 is installed on the outer wall of the joint between the receiving pipe 100 and the composite connecting pipe 200 and covers the outer wall of the joint. The leak detection device 300 includes an outer frame 310, a water-absorbing component 320 and a sliding component 330. The sliding component 330 and the water-absorbing component 320 are both installed on the inner wall of the outer frame 310. The sliding component 330 is slidably connected to the outer frame 310. The water-absorbing component 320 abuts against the sliding component 330. After absorbing water, the water-absorbing component 320 can expand and squeeze and push the sliding component 330 to slide out to the outside of the outer frame 310.

[0032] Specifically, the sliding member 330 includes a sliding plate 331 and a prompting rod 332. The prompting rod 332 is fixedly connected to the side of the sliding plate 331. One end face of the water-absorbing member 320 abuts against the sliding plate 331. The sliding plate 331 is slidably connected to the outer frame 310. The side of the outer frame 310 is provided with a sliding through hole 311. The prompting rod 332 is inserted into the sliding through hole 311. After the water-absorbing member 320 absorbs water and expands, the sliding plate 331 slides and drives the prompting rod 332 to extend out of the sliding through hole 311. The prompting rod 332 is mainly for prompting. When the water-absorbing member 320 expands, the prompting rod 332 on the sliding member 330 slides out of the sliding through hole 311 of the outer frame 310, while the side wall of the sliding plate 331 abuts against the inner side wall of the outer frame 310 to prevent the entire sliding member 330 from sliding out of the outer frame 310.

[0033] Specifically, it also includes a receiving device 400 detachably connected to the receiving pipe 100 and the composite connecting pipe 200. The receiving device 400 includes a receiving ring 410, which is located at both ends along the axis of the outer frame 310. An elastic part 333 is also provided on the side of the sliding plate 331 away from the indicator rod 332. A support through hole 321 is provided on the water-absorbing component 320. One end of the elastic part 333 is fixedly connected to the end face of the sliding plate 331, and the other end passes through the support through hole 321 and out of the outer frame 310 and is fixedly connected to the receiving ring 410. The function of the elastic part 333 is... The entire sliding member 330 is controlled by an elastic part 333, which is an elastic pull rope. The sliding member 330 has a certain sliding space within the outer frame 310 and can slide freely within the outer frame 310 along the axial direction of the receiving pipe 100. When the pipe is not leaking, the indicator rod 332 of the sliding member 330 may accidentally slide out of the outer frame 310 due to external force. The elastic part 333 can apply elastic force to the sliding member 330 to hold it in place when the pipe is not leaking and the water-absorbing member 320 has not absorbed water and expanded, thus preventing the indicator rod 332 from sliding out of the outer frame 310.

[0034] The working principle of this easily leak-detectable composite pipe connection structure in this embodiment is as follows:

[0035] The water-absorbing component 320 and the sliding component 330 are installed into the inner wall of the outer frame 310, and one end of the elastic part 333 is guided to pass through the support through hole 321 of the water-absorbing component 320 and out of the outer frame 310 to be fixedly connected with the receiving ring 410. After the assembly is completed, the entire leak detection device 300 is fitted onto the outside of the receiving pipe 100, and the receiving pipe 100 and the composite connecting pipe 200 are connected. The entire leak detection device 300 is moved axially so that the leak detection device 300 is located at the connection joint of the receiving pipe 100 and the composite connecting pipe 200. When the water-absorbing component 320 expands without absorbing water, the elastic part 333 can pull the sliding plate 331, preventing it from sliding inside the outer frame 310. When water leaks at any position at the connection, the water-absorbing component 320 will continuously absorb water and expand. The expansion of the water-absorbing component 320 pushes the sliding plate 331 to slide inside the outer frame 310. The sliding plate 331 drives the indicator rod 332 to extend out of the sliding through hole 311.

[0036] The beneficial effects of this embodiment are as follows: the water-absorbing component 320 abuts against the sliding plate 331 of the sliding component 330. After the water-absorbing component 320 absorbs water, it can expand and squeeze and push the sliding plate 331 to make the indicator rod 332 slide out to the outside of the outer frame 310. When the worker observes the obvious action of the indicator rod 332 extending to the outside of the outer frame 310, it proves that the connection has leaked and needs to be maintained. Even if there is a slight leak at the connection or the location of the leak is relatively hidden, the leak detection device 300 can also give an obvious action to remind the worker that the pipe leak needs to be repaired.

[0037] Example 2

[0038] This embodiment is a second embodiment of an easily leak-detectable composite pipe connection structure, such as... Figures 3 to 7 As shown, the difference from Embodiment 1 is as follows:

[0039] Specifically, it also includes positioning sleeves 500 installed on the outer walls of the composite connecting pipe 200 and the receiving pipe 100 respectively, and abutting against the two end side walls of the outer frame 310. Positioning protrusions 600 are respectively provided on the outer walls of the composite connecting pipe 200 and the receiving pipe 100, and positioning grooves 510 are provided on the inner wall of the positioning sleeves 500, with the positioning protrusions 600 inserted into the positioning grooves 510. The function of the positioning sleeves 500 is to axially fix the outer frame 310, preventing the entire outer frame 310 from moving axially. If the outer frame 310 moves axially... If the water-absorbing component 320 is not able to accurately cover the connection between the receiving pipe 100 and the composite connecting pipe 200, when the positioning protrusion 600 is inserted into the positioning groove 510, the position of the entire outer frame 310 in the axial direction of the pipe can be fixed. The water-absorbing component 320 occupies most of the space inside the outer frame 310, and the water-absorbing component 320 can cover the entire connection. The circumferential direction of the outer frame 310 does not need to be fixed, because the circumferential rotation of the outer frame 310 does not affect the normal operation of the internal water-absorbing component 320 and the sliding component 330.

[0040] Specifically, the positioning sleeve 500 is semi-circular in shape and has a mating part 521. When the positioning sleeve 500 is installed on the outer wall of the composite connecting pipe 200 and the receiving pipe 100, the mating parts 521 on the two positioning sleeves 500 are fixedly connected. The positioning sleeve 500 needs to be installed on the receiving pipe 100 and the composite connecting pipe 200. The outer wall of the receiving pipe 100 and the composite connecting pipe 200 has a positioning protrusion 600. The positioning sleeve 500 cannot pass through the positioning protrusion 600. By setting the positioning sleeve 500 to be semi-circular, during installation, the two semi-circular rings are respectively installed on the outer wall of the pipe and spliced ​​into a complete ring through the fixed connection of the mating part 521. The positioning protrusion 600 can be smoothly inserted into the positioning groove 510. The installation method is reasonable and convenient.

[0041] Specifically, the positioning sleeve 500 includes a positioning outer part 520 and a receiving part 530. A positioning post 522 is provided on the inner wall of the positioning outer part 520, and a positioning through hole 531 is provided on the outer wall of the receiving part 530. The outer wall of the receiving part 530 is fitted and installed in close contact with the inner wall of the positioning outer part 520. The outer wall surface of the positioning post 522 and the inner wall surface of the positioning through hole 531 form a positioning groove 510. The positioning sleeve 500 is divided into a positioning outer part 520 and a receiving part 530. The function of the receiving part 530 is to buffer the pressure between the positioning outer part 520 and the receiving pipe 100 or the composite connecting pipe 200. After the positioning post 522 is inserted into the positioning through hole 531, it can axially fix the receiving part 530.

[0042] Specifically, the positioning protrusion 600 is in the form of a circular cylindrical part. When the positioning protrusion 600 is inserted into the positioning groove 510, the positioning post 522 is inserted into the inside of the cylindrical part of the positioning protrusion 600. Both the positioning protrusion 600 and the positioning post 522 are protruding solids. After the positioning post 522 is inserted into the positioning through hole 531, there is a suitable gap between the outer wall surface of the positioning post 522 and the inner wall surface of the positioning through hole 531 to form the positioning groove 510. The positioning protrusion 600 can then be inserted into the positioning groove 510, so that the positioning protrusion 600, the positioning sleeve and the receiving part 530 can be connected normally.

[0043] The working principle of this easily leak-detectable composite pipe connection structure in this embodiment is as follows:

[0044] First, install the receiving part 530 on the positioning outer part 520 to form a positioning sleeve 500. Then, install the two positioning sleeves 500 on the outer wall of the receiving pipe 100 or the composite connecting pipe 200 so that the positioning protrusion 600 is inserted into the positioning groove 510. Finally, fix the mating part 521 on the two positioning sleeves 500 to form a complete ring.

[0045] The beneficial effects of this embodiment are: during installation, the two semicircular rings are respectively installed on the outer wall of the pipe and spliced ​​into a complete ring through the fixing connection of the docking part 521. The positioning protrusion 600 can be smoothly inserted into the positioning groove 510, and the installation method is reasonable and convenient.

[0046] Example 3

[0047] This embodiment is the third embodiment of an easily leak-detectable composite pipe connection structure, such as... Figure 2 and 3 As shown, the difference from Embodiment 1 is as follows:

[0048] Specifically, the receiving device 400 also includes a pull rod 420. The receiving ring 410 is provided with a sleeve joint 411. The pull rod 420 passes through the sleeve joint 411 on the two receiving rings 410 and is connected to the sleeve joint 411. The pull rod 420 passes through the sleeve joint 411 to improve the connection strength at the connection joint between the receiving pipe 100 and the composite connecting pipe 200 and avoid damage from external forces.

[0049] Specifically, the pull rod 420 is threadedly connected to the sleeve 411. The receiving pipe 100 and the composite connecting pipe 200 are connected by an insertion type. The receiving pipe 100 generally has a large friction between it and the composite connecting pipe 200. The pull rod 420 rotates inside the sleeve 411, which can drive the two receiving rings 410 to move closer to each other, so that the receiving pipe 100 and the composite connecting pipe 200 can be smoothly inserted.

[0050] Specifically, it also includes a seal 700. The receiving pipe 100 and the composite connecting pipe 200 are sealed together by the seal 700. The seal 700 is a sealant or sealing ring that can seal the connection between the receiving pipe 100 and the composite connecting pipe 200.

[0051] The working principle of this easily leak-detectable composite pipe connection structure in this embodiment is as follows:

[0052] The pull rod 420 passes through the socket 411 and rotates within the socket 411. The threaded connection causes the two receiving rings 410 to move closer to each other, so that the receiving pipe 100 and the composite connecting pipe 200 can be smoothly inserted.

[0053] The beneficial effects of this embodiment are: the threaded connection between the pull rod 420 and the sleeve 411 improves the connection strength at the joint between the receiving pipe 100 and the composite connecting pipe 200, avoids damage from external forces, and at the same time can drive the two receiving rings 410 to move closer to each other, so that the receiving pipe 100 and the composite connecting pipe 200 can be smoothly inserted.

[0054] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A leak-detectable composite pipe connection structure, comprising a receiving pipe (100) and a composite connecting pipe (200) sealed to both ends of the receiving pipe (100), characterized in that, It also includes a leak detection device (300), which is installed on the outer wall of the joint between the receiving pipe (100) and the composite connecting pipe (200) and covers the outer wall of the joint. The leak detection device (300) includes an outer frame (310), a water-absorbing component (320) and a sliding component (330). The sliding component (330) and the water-absorbing component (320) are both installed on the inner wall of the outer frame (310). The sliding component (330) is slidably connected to the outer frame (310). The water-absorbing component (320) abuts against the sliding component (330). After absorbing water, the water-absorbing component (320) can expand and squeeze to push the sliding component (330) to slide out to the outside of the outer frame (310).

2. The easily leak-detectable composite pipe connection structure according to claim 1, characterized in that, The sliding member (330) includes a sliding plate (331) and a prompting rod (332). The prompting rod (332) is fixedly connected to the side of the sliding plate (331). One end face of the water-absorbing member (320) abuts against the sliding plate (331). The sliding plate (331) is slidably connected to the outer frame (310). The side of the outer frame (310) is provided with a sliding through hole (311). The prompting rod (332) is inserted into the sliding through hole (311). After the water-absorbing member (320) absorbs water and expands, the sliding plate (331) slides and drives the prompting rod (332) to extend out of the sliding through hole (311).

3. The easily leak-detectable composite pipe connection structure according to claim 2, characterized in that, It also includes a receiving device (400) detachably connected to the receiving pipe (100) and the composite connecting pipe (200). The receiving device (400) includes a receiving ring (410) located at both ends of the outer frame (310) along its axis. An elastic part (333) is also provided on the side of the sliding plate (331) away from the indicator rod (332). A support through hole (321) is provided on the water-absorbing component (320). One end of the elastic part (333) is fixedly connected to the end face of the sliding plate (331), and the other end passes through the support through hole (321) and out of the outer frame (310) and is fixedly connected to the receiving ring (410).

4. The easily leak-detectable composite pipe connection structure according to claim 1, characterized in that, It also includes positioning sleeves (500) respectively installed on the outer walls of the composite connecting pipe (200) and the receiving pipe (100) and abutting against the two end side walls of the outer frame (310). Positioning protrusions (600) are respectively provided on the outer walls of the composite connecting pipe (200) and the receiving pipe (100), and positioning grooves (510) are provided on the inner wall of the positioning sleeve (500). The positioning protrusions (600) are inserted into the positioning grooves (510).

5. The easily leak-detectable composite pipe connection structure according to claim 4, characterized in that, The positioning sleeve (500) is semi-circular and has a docking part (521). When the positioning sleeve (500) is installed on the outer wall of the composite connecting pipe (200) and the receiving pipe (100), the docking parts (521) on the two positioning sleeves (500) are fixedly connected.

6. The easily leak-detectable composite pipe connection structure according to claim 4, characterized in that, The positioning sleeve (500) includes a positioning outer part (520) and a receiving part (530). A positioning post (522) is provided on the inner wall of the positioning outer part (520), and a positioning through hole (531) is provided on the outer wall of the receiving part (530). The outer wall of the receiving part (530) is fitted and installed against the inner wall of the positioning outer part (520). The outer wall surface of the positioning post (522) and the inner wall surface of the positioning through hole (531) form the positioning groove (510).

7. The easily leak-detectable composite pipe connection structure according to claim 6, characterized in that, The positioning protrusion (600) is in the shape of a circular cylindrical part. When the positioning protrusion (600) is inserted into the positioning groove (510), the positioning post (522) is inserted into the inside of the cylindrical part of the positioning protrusion (600).

8. The easily leak-detectable composite pipe connection structure according to claim 3, characterized in that, The receiving device (400) further includes a pull rod (420), and the receiving ring (410) is provided with a sleeve (411). The pull rod (420) passes through the sleeve (411) on the two receiving rings (410) and is connected to the sleeve (411).

9. The easily leak-detectable composite pipe connection structure according to claim 8, characterized in that, The pull rod (420) is threadedly connected to the sleeve (411).

10. A leak-detectable composite pipe connection structure according to any one of claims 1-9, characterized in that, It also includes a sealing element (700), through which the receiving pipe (100) and the composite connecting pipe (200) are sealed together.

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