Water supply polyethylene pipe connection assembly

Abstract

This invention belongs to the field of water supply pipe connection technology, specifically disclosing a polyethylene pipe connection assembly for water supply, including a bend, with connecting straight pipes at both ends of the bend. Both ends of the outer wall of the bend are connected to one end of each of the two connecting straight pipes via locking mechanisms. An internal support mechanism is connected to each connecting straight pipe at the corresponding location on the bend, with one end of each internal support mechanism located inside the two connecting straight pipes. Each internal support mechanism includes a housing, and a slip ring is slidably connected to the inner wall of the bend below the housing. This invention can clamp the outer wall of the straight pipe by tightening the locking mechanism; rotating two take-up rollers respectively winds up a first take-up rope and a second take-up rope, causing the slip ring to move. The wedge-shaped action of the extrusion ring and extrusion block causes the expansion plate to open radially, thus clamping the inner wall of the straight pipe from the inside. This invention achieves double clamping from both inside and outside, centralized operation, suitability for confined spaces, and is detachable and reusable with reliable sealing.

Description

Technical Field

[0001] This invention belongs to the field of water supply pipe fittings connection, and specifically discloses a polyethylene pipe connection assembly for water supply. Background Technology

[0002] Polyethylene (PE) pipes for water supply are widely used in urban water supply, farmland irrigation, and landscaping projects due to their corrosion resistance, light weight, and good flexibility. In actual pipeline laying, it is often necessary to connect multiple straight pipe sections into a continuous pipeline or to change the direction of water flow using elbows. Common connection methods include heat fusion, electrofusion, and mechanical crimping. Among these, heat fusion and electrofusion require specialized heating equipment, are complex to operate, and are non-removable once connected, making maintenance and replacement difficult. Mechanical crimping, although detachable, is mostly used for butt joints between straight pipes or for connecting straight pipes to fittings. Its connection components are usually installed at the end of the straight pipe, and sealing and fastening are achieved through external crimping or threaded locking.

[0003] However, at points where pipelines need to bend, it is usually necessary to connect two straight pipes to separate elbows, meaning each connection uses a separate connector. This split structure of "elbow + two connectors" not only increases the number of parts and potential leakage points, but also the elbow itself occupies a certain turning radius, resulting in very limited clamping space at the bend (such as in valve wells, corners, and pipe trench bends). Construction workers find it difficult to operate two independent connecting components simultaneously in this confined space, leading to low installation efficiency and a high risk of leakage due to improper operation. Furthermore, pipelines are subject to impact loads such as water hammer and foundation settlement during long-term use. Traditional mechanical connections often rely solely on a single external clamp or internal support, which lacks sufficient impact resistance and tensile strength, making them prone to loosening or even detachment. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a polyethylene pipe connection assembly for water supply.

[0005] To achieve the above objectives, the present invention provides a polyethylene pipe connection assembly for water supply, including a bend, both ends of which are provided with connecting straight pipes, and both ends of the outer wall of the bend are respectively connected to one end of the two connecting straight pipes through a locking mechanism;

[0006] Each bend is connected to a straight pipe with an internal support mechanism, and one end of each of the two internal support mechanisms is located inside the two connecting straight pipes.

[0007] The internal support mechanism includes a housing, and a slip ring is slidably connected to the inner wall of the bent tube at the lower part of the housing. Both sides of the slip ring are inclined. A first winding rope is connected to one side of the slip ring, and a second winding rope is connected to the other side of the slip ring. Both sides of the lower end of the inner wall of the housing are connected to winding rollers, and the two winding rollers respectively wind up the first winding rope and the second winding rope.

[0008] With the help of the two winding ropes and winding rollers, the slip ring can be moved in both directions by remote control, so as to realize the active opening and active retraction of the inner support mechanism. The operation is flexible and adaptable to different installation and maintenance needs.

[0009] The slip ring is circumferentially connected to a plurality of push rods on the side adjacent to the connecting straight pipe. One end of each push rod is connected to a compression ring. A support plate is connected to the inner wall of the bend pipe corresponding to the outer wall of the compression ring. Each support plate is connected to a compression block corresponding to the outer wall of the compression ring. The compression block is inclined and its shape is adapted to the shape of the outer wall of the compression ring.

[0010] Preferably, both ends of the bend are connected to a first sealing gasket, and one side of each of the two first sealing gaskets contacts one end of each of the two connecting straight pipes. The first sealing gaskets form a first seal between the end faces of the bend and the straight pipes, preventing the medium inside the pipe from leaking out from the end face gap and improving the sealing reliability of the connection.

[0011] Preferably, the locking mechanism includes a connecting ring, the inner wall of which is connected to one side of the outer wall of the bend, a mounting ring connected to one side of the connecting ring, a fixing ring connected to the inner wall of the mounting ring, the fixing ring having a circular cross-section, the inner wall of the fixing ring contacting the corresponding outer wall of the connecting straight pipe, and a tightening plate connected to one side of the fixing ring. There are five tightening plates, all circumferentially distributed, and a connecting pad is connected to the corresponding outer wall of the connecting straight pipe at the tightening plate. The connecting pad is directly connected to the corresponding outer wall of the connecting straight pipe.

[0012] The connecting ring and fixing ring provide a stable installation base, and multiple circumferentially distributed tightening plates can evenly grip the outer wall of the straight pipe when compressed, avoiding local stress concentration. The connecting pad increases friction and protects the pipe wall.

[0013] Preferably, the outer wall of the mounting ring is threaded with an external threaded ring, the external threaded ring is threaded onto the outer wall of the mounting ring, a clamping ring is connected to one side of the inner wall of the external threaded ring, the clamping ring is sleeved onto the outer wall of the connecting straight pipe, one side of the clamping ring is inclined, one side of the clamping ring is in contact with one end of a plurality of tightening plates, and a second sealing gasket is connected to the inner wall of the clamping ring.

[0014] Preferably, the bend has winding holes at the locations of the first winding rope and the second winding rope, and sealing rings are embedded inside the two winding holes, with the first winding rope and the second winding rope located inside the two sealing rings respectively.

[0015] Preferably, a first stabilizing roller is rotatably connected to the inner wall of the bent tube at the locations corresponding to the first and second winding ropes. The two ends of the first stabilizing roller are connected to the inner wall of the bent tube through mounting blocks. A second stabilizing roller is rotatably connected to both sides of the inner wall of the housing at the locations corresponding to the first and second winding ropes. The two ends of the second stabilizing roller are rotatably connected to both sides of the inner wall of the housing.

[0016] The first and second stabilizing rollers guide and limit the winding rope, reducing friction and sway during movement, extending rope life, and ensuring smooth transmission.

[0017] Preferably, a rotating handle is connected to the middle of the upper end of the two winding rollers, and the upper ends of the two rotating handles extend through to the upper end of the housing. The outer wall of the rotating handle is fitted with an anti-slip sleeve.

[0018] Preferably, the outer wall of the extrusion ring is inclined, and the outer wall of the extrusion ring is circumferentially embedded with balls. There are six supporting plates, which are circumferentially distributed. One end of each supporting plate is inclined. Multiple balls are in rolling contact on one side of the extrusion block, and anti-slip pads are connected to the side of each supporting plate away from the extrusion ring.

[0019] The ball bearings convert the sliding friction between the extrusion ring and the extrusion block into rolling friction, significantly reducing operating resistance and making the opening action smoother; the six evenly distributed opening plates ensure uniform force on the inner wall of the straight pipe; the anti-slip pads increase the friction with the pipe wall and prevent axial sliding.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention uses a locking mechanism to externally clamp the connecting straight pipe, while simultaneously using an internal support mechanism to internally support the connecting straight pipe, forming a double fixation. The internal support mechanism employs a wedge-shaped fit structure of a slip ring, a winding rope, a compression ring, and a support plate, converting axial thrust into radial expansion force. The support plate is in close contact with the inner wall of the straight pipe, providing a certain degree of self-locking performance. Under water pressure fluctuations or external impacts, the clamping force is not easily loosened, and the pull-out resistance and impact resistance are improved compared to single external clamping or heat fusion connection.

[0022] All operations are performed outside the bend, eliminating the need for large wrench spaces at both ends of the bend. This makes it suitable for narrow working environments such as valve wells, corners, and pipe trench bends, helping to alleviate the inconvenience caused by the existing split connectors requiring multiple operating positions and insufficient space.

[0023] The external locking mechanism can be loosened by rotating the external threaded ring in the opposite direction, and the internal support mechanism can be retracted by rotating the other winding roller in the opposite direction. This allows for quick disassembly of the connecting straight pipe and reinstallation. Compared with traditional one-time heat fusion connection, this facilitates pipe maintenance, replacement and rerouting, and helps reduce long-term maintenance costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0025] Figure 2 This is a schematic diagram of the installation structure of the tightening plate and the clamping ring of the present invention;

[0026] Figure 3 This is a schematic diagram of the installation structure of the multiple tightening plates of the present invention;

[0027] Figure 4 This is an overall cross-sectional view of the device of the present invention;

[0028] Figure 5 This is a cross-sectional structural schematic diagram of the internal support mechanism of the present invention;

[0029] Figure 6 For the present invention Figure 5 A magnified structural diagram of A in the middle;

[0030] Figure 7 This is a schematic diagram of the installation structure of the multiple support plates of the present invention.

[0031] In the diagram: 1. Bend; 2. Connecting straight pipe; 3. First sealing gasket; 4. Connecting ring; 5. Mounting ring; 6. Fixing ring; 7. Tightening plate; 8. External threaded ring; 9. Pressing ring; 10. Second sealing gasket; 11. Housing; 12. Slip ring; 13. First winding rope; 14. Second winding rope; 15. Sealing ring; 16. First stabilizing roller; 17. Second stabilizing roller; 18. Winding roller; 19. Rotating handle; 20. Push rod; 21. Extrusion ring; 22. Ball bearing; 23. Spreading plate; 24. Extrusion block; 25. Anti-slip pad. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0034] like Figures 1-7The water supply polyethylene pipe connection assembly shown includes a bend 1, with connecting straight pipes 2 at both ends of the bend 1. Both ends of the outer wall of the bend 1 are connected to one end of the two connecting straight pipes 2 respectively through a locking mechanism.

[0035] Each bend 1 is connected to a straight pipe 2 with an internal support mechanism, and one end of each internal support mechanism is located inside the two connecting straight pipes 2.

[0036] The internal support mechanism includes a housing 11. A slip ring 12 is slidably connected to the inner wall of the bend 1 at the lower part of the housing 11. Both sides of the slip ring 12 are inclined. A first winding rope 13 is connected to one side of the slip ring 12, and a second winding rope 14 is connected to the other side of the slip ring 12. Both sides of the lower end of the inner wall of the housing 11 are connected to winding rollers 18. The two winding rollers 18 respectively wind up the first winding rope 13 and the second winding rope 14.

[0037] The first winding rope 13 and the second winding rope 14 are wound in opposite directions on their respective winding rollers, so that when the two winding rollers rotate in the same direction, one rope is wound up while the other rope is released.

[0038] The take-up roller 18 has a one-way roller clutch inside. The take-up roller 18 includes an inner ring fixedly connected to a rotating handle 19 and an outer ring fixedly connected to the outer shell of the take-up roller 18. Multiple wedge-shaped rollers are arranged between the inner and outer rings. A wedge-shaped groove is machined on the outer wall of the inner ring or the inner wall of the outer ring. The rollers are installed in the wedge-shaped grooves. A spring is provided on one side of each roller, pushing the roller towards the narrow end of the wedge-shaped groove. When the operator rotates the rotating handle 19 in the winding direction, the inner ring rotates relative to the outer ring, and the roller is pushed into the narrow end of the wedge-shaped groove under the action of the spring, thus wedging tightly between the inner and outer rings. Currently, it is locked in one direction. At this time, the take-up roller 18 can only take up and cannot unwind in the reverse direction, ensuring that the clamping force does not loosen. When it is necessary to unwind in the reverse direction, the operator rotates the rotating handle 19 in the reverse direction. The roller is pushed to the wide end of the wedge groove, the inner ring and the outer ring separate, and the take-up roller 18 can freely reverse to achieve unwinding. This one-way roller clutch is completely built into the take-up roller 18. No external lever or manual unlocking operation is required. The one-way locking and two-way free switching of the take-up roller can be achieved by simply rotating the handle in the forward and reverse directions. It has a compact structure and is easy to operate. It is especially suitable for quick installation and disassembly in narrow spaces at bends.

[0039] A slip ring 12 is circumferentially connected to a plurality of push rods 20 on the side near the adjacent connecting straight pipe 2. One end of the plurality of push rods 20 is connected to a compression ring 21. When the compression ring 21 moves axially, its inclined outer wall pushes the compression block 24, causing the plurality of spreading plates 23 to open radially outward and tighten the inner wall of the connecting straight pipe 2. The inner wall of the bend pipe 1 is connected to the spreading plate 23 at the position corresponding to the outer wall of the compression ring 21. Each of the plurality of spreading plates 23 is connected to the compression block 24 at the position corresponding to the outer wall of the compression ring 21. The compression block 24 is inclined and the shape of the compression block 24 is adapted to the shape of the outer wall of the compression ring 21.

[0040] The bend 1 is a 90° prefabricated polyethylene elbow, with its two ends connected to the connecting straight pipe 2. The locking mechanism clamps the connecting straight pipe 2 from the outside, and the internal support mechanism supports the connecting straight pipe 2 from the inside, forming a double fixation. When the internal support mechanism is working, the operator rotates the winding roller 18 to wind up the first winding rope 13 or the second winding rope 14, which drives the slip ring 12 to slide axially along the inner wall of the bend 1. The inclined surfaces on both sides of the slip ring 12 cooperate with the housing 11 to achieve smooth guidance. When the slip ring 12 moves, it pushes the extrusion ring 21 to move axially through the push rod 20. The outer inclined surface of the extrusion ring 21 interacts with the inclined surface of the extrusion block 24 on the expansion plate 23, converting the axial thrust into a radial expansion force, causing the multiple expansion plates 23 to open outward and tightly support the inner wall of the connecting straight pipe 2.

[0041] Both ends of the bend 1 are connected to a first sealing gasket 3, and one side of each of the two first sealing gaskets 3 contacts one end of each of the two connecting straight pipes 2.

[0042] At both ends of the bend 1, a first sealing gasket 3 is embedded or bonded. The sealing gasket is made of EPDM rubber or nitrile rubber. When the connecting straight pipe 2 is inserted into place, its end face is tightly fitted with the first sealing gasket 3. Under the action of the locking mechanism and the internal support mechanism, the end face of the connecting straight pipe 2 continuously presses the first sealing gasket 3 to form an end face seal.

[0043] like Figures 1-4 As shown: The locking mechanism includes a connecting ring 4. The inner wall of the connecting ring 4 is connected to one side of the outer wall of the bend 1. A mounting ring 5 is connected to one side of the connecting ring 4. A fixing ring 6 is connected to the inner wall of the mounting ring 5. The fixing ring 6 has a circular cross-section. The inner wall of the fixing ring 6 is in contact with the outer wall of the corresponding connecting straight pipe 2. A tightening plate 7 is connected to one side of the fixing ring 6. There are five tightening plates 7. The five tightening plates 7 are circumferentially distributed. A connecting pad is connected to the corresponding outer wall of the connecting straight pipe 2. The connecting pad is directly connected to the outer wall of the corresponding connecting straight pipe 2.

[0044] The locking mechanism is fixed to the outer wall of the bend 1 by the connecting ring 4. Five tightening plates 7 are evenly distributed around the circumference. One end is connected to the fixing ring 6, and the other end is a free end. A connecting pad is fixed on the inner side of each tightening plate 7. When the external threaded ring 8 is not tightened, the tightening plate 7 is in a naturally open state, allowing the straight pipe 2 to be easily inserted.

[0045] An external threaded ring 8 is threadedly connected to the outer wall of the mounting ring 5. The external threaded ring 8 is threadedly sleeved on the outer wall of the mounting ring 5. A clamping ring 9 is connected to one side of the inner wall of the external threaded ring 8. The clamping ring 9 is sleeved to the outer wall of the connecting straight pipe 2. One side of the clamping ring 9 is inclined. One side of the clamping ring 9 is in contact with one end of a plurality of tightening plates 7. A second sealing gasket 10 is connected to the inner wall of the clamping ring 9.

[0046] The external threaded ring 8 engages with the external thread of the mounting ring 5 and is fitted onto the outside of the connecting straight pipe 2. When the external threaded ring 8 is tightened, the internal clamping ring 9 moves toward the bend 1. One side of the clamping ring 9 is an inclined surface, which contacts the outer ends of the five tightening plates 7. As the clamping ring 9 moves forward, the inclined surface forces the five tightening plates 7 to contract radially inward, thereby gripping the outer wall of the connecting straight pipe 2. At the same time, the second sealing gasket 10 on the inner wall of the clamping ring 9 is compressed between the outer wall of the connecting straight pipe 2 and the clamping ring 9, forming a second external seal.

[0047] like Figures 5-7 As shown: The bend 1 has winding holes at the positions corresponding to the first winding rope 13 and the second winding rope 14. A sealing ring 15 is embedded inside the two winding holes. The first winding rope 13 and the second winding rope 14 are respectively located inside the two sealing rings 15.

[0048] The inner diameter of the sealing ring 15 is slightly smaller than the diameter of the winding rope. The first winding rope 13 and the second winding rope 14 pass through the center of the corresponding sealing ring 15 and can slide axially. When the pipe is filled with pressurized water, the water pressure will press the inner lip of the sealing ring 15 tightly against the winding rope, thereby preventing water from seeping out along the rope.

[0049] like Figures 5-6 As shown: A first stabilizing roller 16 is rotatably connected to the inner wall of the bend 1 at the positions corresponding to the first winding rope 13 and the second winding rope 14. The two ends of the first stabilizing roller 16 are connected to the inner wall of the bend 1 through mounting blocks. A second stabilizing roller 17 is rotatably connected to both sides of the inner wall of the housing 11 at the positions corresponding to the first winding rope 13 and the second winding rope 14. The two ends of the second stabilizing roller 17 are rotatably connected to both sides of the inner wall of the housing 11.

[0050] The first winding rope 13 and the second winding rope 14 are respectively connected to the slip ring 12 and the winding roller 18 after passing over the corresponding first stabilizing roller 16 and second stabilizing roller 17. The first stabilizing roller 16 and the second stabilizing roller 17 play the role of guiding and reducing friction, preventing the winding rope from being worn against the tube wall or shell edge during long-distance movement, while ensuring that the rope always moves along the designed path, thus improving transmission efficiency and operating feel.

[0051] Two take-up rollers 18 are connected to the middle of the upper end of a rotating handle 19. The upper ends of the two rotating handles 19 extend through to the upper end of the housing 11. The outer wall of the rotating handles 19 is fitted with an anti-slip sleeve.

[0052] A rotating handle 19 is fixedly connected to the upper center of each take-up roller 18. The rotating handle 19 passes through the through hole at the upper end of the housing 11 and extends to the outside of the housing. During on-site construction, the operator does not need to open the housing 11. He can drive the take-up roller 18 to rotate by hand or wrench, thereby winding or releasing the take-up rope.

[0053] The outer wall of the extrusion ring 21 is inclined, and the outer wall of the extrusion ring 21 is circumferentially embedded with balls 22. There are six supporting plates 23, which are circumferentially distributed. One end of the supporting plate 23 is inclined. Multiple balls 22 are located on one side of the extrusion block 24 and roll in contact. Anti-slip pads 25 are connected to the side of the multiple supporting plates 23 away from the extrusion ring 21.

[0054] The outer wall of the extrusion ring 21 is machined into a conical surface, and multiple freely rolling balls 22 are evenly embedded in the circumferential direction on the conical surface. The inner side of the extrusion block 24 is also an inclined surface, which matches the outer inclined surface of the extrusion ring 21. When the extrusion ring 21 moves axially, the balls 22 roll into contact with the inclined surface of the extrusion block 24, changing the sliding friction into rolling friction, which significantly reduces the pushing resistance. At the same time, the six expansion plates 23 open outward radially, and the anti-slip pads 25 fixed on their outer sides are in close contact with the inner wall of the connecting straight pipe 2, which increases the friction and prevents the straight pipe from axially sliding under the impact of high-pressure water flow.

[0055] The one-way roller clutches used inside the two take-up rollers 18 involved in this embodiment of the invention, as well as the specific structural details and connection methods such as threaded connections, sealing ring installation, fixing methods of the take-up rope and slip ring, ball bearing installation and rolling, and bearing installation of various rotating components (such as stabilizing rollers and take-up rollers), are all conventional technical means in the field and belong to the scope of prior art. Those skilled in the art can select appropriate standard parts or conventional processing techniques according to actual needs, and their specific working principles and installation methods will not be elaborated here.

[0056] Working principle: Insert the two straight connecting pipes 2 into the sockets at both ends of the bend 1 until the end face of the straight connecting pipe 2 is in close contact with the first sealing gasket 3 at the end of the bend 1. At this time, the outer wall of the straight connecting pipe 2 is in contact with the inner wall of the fixing ring 6 in the locking mechanism and the connecting pads on the inner sides of the five tightening plates 7, while the inner wall of the straight connecting pipe 2 is in contact with the anti-slip pad 25 on the outer side of the spreading plate 23 in the inner support mechanism.

[0057] Operating the locking mechanism: Tighten the two external threaded rings 8 respectively. The external threaded rings 8 move along the threads of the mounting ring 5 towards the bend 1, causing the clamping ring 9 to move synchronously. The inclined surface of the clamping ring 9 pushes the five tightening plates 7 to contract radially inward, causing the connecting gaskets on the inner side of the tightening plates 7 to grip the outer wall of the connecting straight pipe 2. At the same time, the second sealing gasket 10 on the inner wall of the clamping ring 9 is compressed between the outer wall of the connecting straight pipe 2 and the clamping ring 9, forming an external seal. At this time, the connecting straight pipe 2 is initially fixed by the external locking mechanism.

[0058] Operating the internal support mechanism: The operator rotates the handle 19 of the take-up roller 18 corresponding to the first take-up rope 13. The take-up roller 18 winds up the first take-up rope 13, and the first take-up rope 13 pulls the slip ring 12 to slide inward toward the bend 1. The one-way roller clutch inside the take-up roller 18 achieves one-way locking in this rotation direction. The inner ring rotates with the handle 19, and the rollers are pushed into the narrow end of the wedge groove under the action of the spring, wedged between the inner and outer rings, thereby preventing reverse rotation and ensuring that the clamping force does not loosen after winding. At the same time, the other take-up roller 18 corresponding to the second take-up rope 14 is in a free reverse rotation state. Its internal rollers are pushed to the wide end of the wedge groove, the inner and outer rings separate, and passive unwinding is allowed.

[0059] When the slip ring 12 moves, the push rod 20 connected to it pushes the extrusion ring 21 to move axially in sync. The outer inclined surface of the extrusion ring 21 interacts with the inclined surface of the extrusion block 24 on the expansion plate 23, converting the axial thrust into a radial expansion force, causing the six circumferentially distributed expansion plates 23 to open radially outward. The anti-slip pads 25 on the outer side of the expansion plates 23 press tightly against the inner wall of the connecting straight pipe 2. Since the outer wall of the extrusion ring 21 is embedded with ball bearings 22, the ball bearings 22 roll in contact with the extrusion block 24, which significantly reduces sliding friction and makes the opening action smoother.

[0060] Once the inner support mechanism is fully tightened, stop rotating the handle 19. The one-way roller clutch inside the take-up roller 18 remains locked, ensuring that the inner support force is maintained and will not loosen due to external force or vibration. At this time, the connecting straight pipe 2 is tightened from the outside and opened from the inside, achieving double fixation inside and outside. The first sealing gasket 3 and the second sealing gasket 10 form two seals on the end face and the outer wall, ensuring that there is no leakage at the connection.

[0061] When it is necessary to disassemble the connecting straight pipe 2, the operator first rotates the external threaded ring 8 in the opposite direction to make the clamping ring 9 retract. The tightening plate 7 opens radially under its own elasticity, loosening its grip on the outer wall of the connecting straight pipe 2.

[0062] Operating the internal support mechanism: Rotate the rotating handle 19 of the take-up roller 18 corresponding to the second take-up rope 14. The take-up roller 18 winds up the second take-up rope 14. The second take-up rope 14 pulls the slip ring 12 to slide outward of the bend 1, i.e. towards the port. The one-way roller clutch inside the take-up roller 18 achieves one-way locking in this rotation direction, maintaining the clamped state after winding. At the same time, the other take-up roller 18 corresponding to the first take-up rope 13 is in a free reverse state, allowing passive unwinding.

[0063] The slip ring 12 drives the compression ring 21 to move in the opposite direction through the push rod 20. The inclined surface of the compression ring 21 disengages from the compression block 24. The expansion plate 23 retracts radially inward under its own elasticity or the action of the return spring. The anti-slip pad 25 disengages from the inner wall of the connecting straight pipe 2. After the inner support mechanism is fully retracted, the connecting straight pipe 2 can be pulled out from both ends of the bend pipe 1 to achieve quick disassembly.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A polyethylene pipe connection assembly for water supply, comprising a bend (1), characterized in that, Both ends of the bend (1) are provided with connecting straight pipes (2), and both ends of the outer wall of the bend (1) are respectively connected to one end of the two connecting straight pipes (2) through locking mechanisms; The bend (1) is connected to the straight pipe (2) at the corresponding connection point, and one end of each of the two inner support mechanisms is located inside the two connecting straight pipes (2); The internal support mechanism includes a housing (11), and a slip ring (12) is slidably connected to the inner wall of the bent tube (1) at the lower part of the housing (11). The slip ring (12) is inclined on both sides. A first winding rope (13) is connected to one side of the slip ring (12), and a second winding rope (14) is connected to the other side of the slip ring (12). Winding rollers (18) are connected to both sides of the lower end of the inner wall of the housing (11). The two winding rollers (18) wind up the first winding rope (13) and the second winding rope (14) respectively. The slip ring (12) is circumferentially connected to a plurality of push rods (20) on the side near the adjacent connecting straight pipe (2). One end of the plurality of push rods (20) is connected to a compression ring (21). The inner wall of the bent pipe (1) is connected to a support plate (23) corresponding to the outer wall of the compression ring (21). Each of the plurality of support plates (23) is connected to a compression block (24) corresponding to the outer wall of the compression ring (21). The compression block (24) is inclined and the shape of the compression block (24) is adapted to the shape of the outer wall of the compression ring (21).

2. The polyethylene pipe connection assembly for water supply according to claim 1, characterized in that, Both ends of the bend (1) are connected to a first sealing gasket (3), and one side of each of the two first sealing gaskets (3) is in contact with one end of each of the two connecting straight pipes (2).

3. A polyethylene pipe connection assembly for water supply according to claim 1, characterized in that, The locking mechanism includes a connecting ring (4), the inner wall of the connecting ring (4) is connected to one side of the outer wall of the bend (1), a mounting ring (5) is connected to one side of the connecting ring (4), a fixing ring (6) is connected to the inner wall of the mounting ring (5), the cross-section of the fixing ring (6) is circular, the inner wall of the fixing ring (6) is in contact with the outer wall of the corresponding connecting straight pipe (2), a tightening plate (7) is connected to one side of the fixing ring (6), there are five tightening plates (7), the five tightening plates (7) are circumferentially distributed, a connecting pad is connected to the outer wall of the corresponding connecting straight pipe (2) of the tightening plate (7), and the connecting pad is directly connected to the outer wall of the corresponding connecting straight pipe (2).

4. A polyethylene pipe connection assembly for water supply according to claim 3, characterized in that, The outer wall of the mounting ring (5) is threaded with an external threaded ring (8), which is threaded onto the outer wall of the mounting ring (5). A clamping ring (9) is connected to one side of the inner wall of the external threaded ring (8). The clamping ring (9) is fitted onto the outer wall of the connecting straight pipe (2). One side of the clamping ring (9) is inclined. One side of the clamping ring (9) is in contact with one end of a plurality of tightening plates (7). A second sealing gasket (10) is connected to the inner wall of the clamping ring (9).

5. A polyethylene pipe connection assembly for water supply according to claim 1, characterized in that, The bend (1) has winding holes at the positions corresponding to the first winding rope (13) and the second winding rope (14), and sealing rings (15) are embedded inside the two winding holes. The first winding rope (13) and the second winding rope (14) are located inside the two sealing rings (15).

6. A polyethylene pipe connection assembly for water supply according to claim 1, characterized in that, The inner wall of the bent tube (1) is rotatably connected to the first winding rope (13) and the second winding rope (14). The two ends of the first stabilizing roller (16) are connected to the inner wall of the bent tube (1) through mounting blocks. The two sides of the inner wall of the housing (11) are rotatably connected to the first winding rope (13) and the second winding rope (14). The two ends of the second stabilizing roller (17) are rotatably connected to the two sides of the inner wall of the housing (11).

7. A polyethylene pipe connection assembly for water supply according to claim 1, characterized in that, Two take-up rollers (18) are connected to a rotating handle (19) at the middle of their upper ends. The upper ends of the two rotating handles (19) extend through to the upper end of the housing (11). The outer wall of the rotating handles (19) is fitted with an anti-slip sleeve.

8. A polyethylene pipe connection assembly for water supply according to claim 1, characterized in that, The outer wall of the extrusion ring (21) is inclined, and the outer wall of the extrusion ring (21) is circumferentially embedded with balls (22). There are six supporting plates (23), which are circumferentially distributed. One end of the supporting plate (23) is inclined. Multiple balls (22) are in rolling contact with the extrusion block (24) on one side. Anti-slip pads (25) are connected to the side of the multiple supporting plates (23) away from the extrusion ring (21).

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