A pipe connector

Abstract

This utility model belongs to the technical field of pipe fittings. It discloses a pipe connector, including an upper collar and a lower collar for connecting to and interlocking with an external pipe. A snap-fit ​​structure is fitted onto the lower collar, and a pressure ring structure is fitted onto the lower collar and above the snap-fit ​​structure for adjusting the snap-fit ​​structure's contraction or extension under the constraint of the upper collar to facilitate connection and disassembly with the external pipe. This utility model has the advantages of enabling efficient and convenient connection and disassembly of flexible hoses and rigid plastic pipes, while also providing good stability and sealing of the pipe connection.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings technology, and more specifically, to a pipe connector. Background Technology

[0002] In household water supply and drainage systems, pipe connection is a crucial step. Depending on their purpose, some pipes require regular disassembly, cleaning, or replacement to ensure unobstructed flow, such as sink drain pipes, aquarium water supply and drainage pipes, and drinking water pipes. These pipes typically connect flexible hoses to rigid plastic pipes for water supply and drainage. Currently, to facilitate quick connection and disconnection of these hoses and pipes, quick-connect fittings have been designed, enabling efficient and convenient pipe connection operations.

[0003] However, existing quick-connect fittings typically involve pre-connecting one end of the quick-connect fitting to the corresponding hose, then fitting the other end of the quick-connect fitting with an external silicone ring and inserting it into the inner cavity of the corresponding rigid plastic pipe. This seals the hose and pipe together to meet pipe connection requirements. While this method satisfies certain needs, it has the following drawbacks: When using traditional quick-connect fittings with silicone rings to seal the hose and pipe, the connection relies on friction generated by the silicone ring. However, the limited frictional force of the silicone ring results in low pressure resistance. When backflow occurs in the rigid plastic pipe, the resulting pressure can easily push the quick-connect fitting, along with the silicone ring, out of the pipe's cavity, compromising the pipe connection's stability and seal. This can lead to backflow and overflow, affecting hygiene and causing incalculable damage, making it unsuitable for practical applications.

[0004] How to solve the above-mentioned technical difficulties has become an urgent technical problem to be solved. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a pipe connector that can achieve efficient and convenient pipe connection and disassembly of flexible hoses and rigid plastic pipes, and has good pipe connection stability and sealing.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pipe connector includes an upper collar and a lower collar for connecting to and interlocking with an external pipe; a snap-fit ​​structure is fitted on the lower collar, and a pressure ring structure is fitted on the lower collar and above the snap-fit ​​structure for adjusting the snap-fit ​​structure to contract or expand under the limitation of the upper collar to facilitate connection and disassembly with the external pipe.

[0008] Preferably, the upper collar includes an upper collar seat for positioning the pressure ring structure, a plurality of insertion blocks for engaging with the lower collar are provided at the bottom of the upper collar seat, an upper connecting ring is provided at the top of the upper collar seat, and a sleeve ring for securely connecting with an external hose and for threaded connection with the upper connecting ring.

[0009] Preferably, the lower collar includes a lower collar seat for insertion into an external rigid plastic tube and for defining the position of the buckle structure. A lower connecting ring is provided at the top of the lower collar seat for engaging with the buckle structure and the pressure ring structure. Several trapezoidal grooves are longitudinally formed on the outer wall of the lower connecting ring for engaging with the corresponding buckle blocks, and the bottom of the trapezoidal grooves gradually rises from front to back.

[0010] Preferably, the snap-fit ​​structure includes a toothed ring sleeved on the lower connecting ring for embedding into the inner wall of the rigid plastic tube to achieve snap-fit ​​connection and fixation, and a lower sealing ring sleeved on the lower connecting ring and located above and below the toothed ring for sealing and abutting with the inner wall of the rigid plastic tube.

[0011] Preferably, the pressure ring structure includes a lower pressure ring sleeved on the upper end of the lower connecting ring for compressing and adjusting the contraction or extension of the toothed ring and the lower sealing ring under the limitation of the lower ring seat to facilitate connection and disassembly with the rigid plastic tube. The top of the lower pressure ring is provided with a lower engagement portion formed by a plurality of unidirectional teeth arranged in a circumferential pattern. The inner wall of the lower engagement portion is also provided with a plurality of limiting protrusions arranged in a circumferential pattern for engaging with the outer edge of the corresponding trapezoidal groove to limit the movement position. The structure also includes an upper pressure ring sleeved on the lower connecting ring above the lower engagement portion for engaging with the lower engagement portion to control the movement of the lower pressure ring.

[0012] Preferably, the upper pressure ring includes a movable ring seat sleeved on the lower connecting ring and located above the lower engagement portion, and the movable ring seat is sleeved with the upper ring seat to limit its upward movement. At the bottom of the movable ring seat, there is an upper engagement portion formed by a plurality of unidirectional teeth arranged in a circumferential pattern, and the upper engagement portion engages with the lower engagement portion. A rotating handle for pushing the movable ring seat to move is also provided on both sides of the movable ring seat.

[0013] Preferably, an upper sealing ring is embedded in the sleeve ring to increase the sealing performance of the connection between the sleeve ring and the upper connecting ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] In this invention, when connecting an external flexible hose to a rigid plastic tube, the upper collar is first securely sealed to the hose. Then, the lower collar, along with the snap-fit ​​structure, is inserted into the cavity of the rigid plastic tube. Next, the pressure ring structure is rotated to allow its lower pressure member to move downwards and compress the snap-fit ​​structure. This causes the sealing member and the insertion member of the snap-fit ​​structure to elastically extend together, allowing the sealing member to tightly abut against the inner wall of the rigid plastic tube for a frictional seal. Simultaneously, the insertion member extends and embeds into the inner wall of the rigid plastic tube for a stable connection. With the snap-fit ​​structure and the rigid plastic tube connected, the lower collar can withstand greater reaction force. When the rigid plastic tube generates backflow pressure, the lower collar is less likely to be pushed out of the rigid plastic tube by the backflow pressure, thus preventing damage to the stability and sealing of the connection. This prevents backflow from the rigid plastic tube from overflowing into the room, affecting the sanitary environment, and causing incalculable losses. Furthermore, when it is necessary to disconnect the external hose from the rigid plastic tube, simply rotate the pressure ring structure in the opposite direction to move its lower pressure member upward to release the pressure on the snap-fit ​​structure. This allows the sealing member and the plug-in member of the snap-fit ​​structure to retract together to restore their original shape. At this time, neither the sealing member nor the plug-in member forms a stable connection with the inner wall of the rigid plastic tube, making it easier to remove the lower collar along with the snap-fit ​​structure from the cavity of the rigid plastic tube. Therefore, this invention has the advantages of enabling efficient and convenient connection and disconnection of hoses and rigid plastic tubes, with good stability and sealing of the connection. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a structural schematic diagram of a pipe connector according to the present invention;

[0018] Figure 2 This is an exploded view of a pipe connector according to the present invention.

[0019] Figure 3 This is a schematic diagram illustrating the connection between a pipe connector and an external flexible hose and rigid plastic pipe according to the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Upper collar, 11. Upper ring seat, 12. Insertion block, 13. Upper connecting ring, 14. Collar ring, 2. Lower collar, 21. Lower ring seat, 22. Lower connecting ring, 23. Trapezoidal groove, 3. Snap-fit ​​structure, 31. Toothed ring, 32. Lower sealing ring, 4. Pressure ring structure, 41. Lower pressure ring, 42. Lower engaging part, 43. Limiting protrusion, 44. Upper pressure ring, 100. Movable ring seat, 200. Upper engaging part, 300. Rotary handle, 5. Upper sealing ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] See Figures 1 to 3 As shown, this embodiment provides a pipe connector, including an upper collar 1 and a lower collar 2 for connecting to an external pipe and engaging with each other; a snap-fit ​​structure 3 is fitted on the lower collar 2, and a pressure ring structure 4 is fitted on the lower collar 2 and above the snap-fit ​​structure 3 for adjusting the snap-fit ​​structure 3 to contract or expand under the limitation of the upper collar 1 to facilitate connection and disassembly with the external pipe. During use, when it is necessary to connect the external flexible hose to the rigid plastic pipe, the upper collar 1 is first used to securely seal the connection with the hose. Then, the lower collar 2, together with the snap-fit ​​structure 3, is inserted into the cavity of the rigid plastic pipe. Next, the pressure ring structure 4 is rotated to move its lower pressure member downward to squeeze the snap-fit ​​structure 3, thereby causing the sealing member and the insertion member of the snap-fit ​​structure 3 to elastically extend together. This allows the sealing member to tightly abut against the inner wall of the rigid plastic pipe to achieve a frictional seal connection. At the same time, the insertion member extends and inserts into the inner wall of the rigid plastic pipe to achieve a stable connection. With the connection between the snap-fit ​​structure 3 and the rigid plastic pipe, the lower collar 2 can withstand a greater reaction force. When the rigid plastic pipe generates backflow pressure, the lower collar 2 is less likely to be pushed out of the rigid plastic pipe by the backflow pressure, thus preventing the connection from being damaged and the seal from being compromised. This prevents backflow from the rigid plastic pipe from overflowing into the room, affecting the sanitary environment and causing incalculable losses. In addition, when it is necessary to disconnect the connection between the external hose and the rigid plastic pipe, simply rotate the pressure ring structure 4 in the opposite direction to move its lower pressure member upward to release the pressure on the snap-fit ​​structure 3. This causes the sealing member and the plug-in member of the snap-fit ​​structure 3 to retract together to restore their original shape. At this time, neither the sealing member nor the plug-in member forms a stable connection with the inner wall of the rigid plastic pipe, making it easier to remove the lower collar 2 together with the snap-fit ​​structure 3 from the cavity of the rigid plastic pipe. This enables efficient and convenient pipe connection and disconnection between the hose and the rigid plastic pipe, with good stability and sealing of the pipe connection.

[0023] In this embodiment, the upper collar 1 includes an upper collar seat 11 for positioning the pressure ring structure 4. A plurality of insertion locking blocks 12 are provided around the bottom of the upper collar seat 11 for engaging with the lower collar 2. An upper connecting ring 13 is also provided at the top of the upper collar seat 11. Furthermore, a sleeve ring 14 is included for securely connecting to an external flexible hose, and this sleeve ring 14 is threadedly connected to the upper connecting ring 13. An upper sealing ring 5 is embedded within the sleeve ring 14 to enhance the sealing performance of the connection between the sleeve ring 14 and the upper connecting ring 13. The lower collar 2 includes a lower collar seat 21 for insertion into an external rigid plastic tube and for defining the position of the buckle structure 3. A lower connecting ring 22 is provided at the top of the lower collar seat 21 for engaging with the buckle structure 3 and the pressure ring structure 4. Several trapezoidal grooves 23 are longitudinally formed on the outer wall of the lower connecting ring 22 for engaging with the corresponding plug-in block 12, and the bottom of the trapezoidal grooves 23 gradually rises from front to back.During use, when it is necessary to connect the external flexible hose to the rigid plastic hose, the upper collar 1's connecting ring 14 is first securely and sealed to the corresponding connector of the hose. Under the sealing action of the upper sealing ring 5, the connecting ring 14 is threadedly connected to the upper connecting ring 13. Then, under the position limitation of the lower collar 2's lower ring seat 21, the snap-fit ​​structure 3 and the pressure ring structure 4 are sequentially fitted onto the lower connecting ring 22. Finally, the snap-fit ​​block 12 and the trapezoidal groove 23 are mutually sealed and snap-fitted together, thereby securely connecting the upper ring seat 11 and the lower connecting ring 22. Together, at this time, the top of the pressure ring structure 4 is fitted onto the upper ring seat 11 to limit its upward movement position. Then, the lower ring 2, together with the snap-fit ​​structure 3, is inserted into the cavity of the rigid plastic tube. Under the limiting action of the lower ring seat 21, the pressure ring structure 4 is rotated so that its lower pressing member moves downward by a predetermined displacement within the movement distance limited by the trapezoidal groove 23 to squeeze the snap-fit ​​structure 3. This causes the sealing member and the plugging member of the snap-fit ​​structure 3 to elastically extend together, thereby making the sealing member tightly abut against the inner wall of the rigid plastic tube to achieve a frictional sealing connection. When the connection is established, the insert component extends and embeds into the inner wall of the rigid plastic pipe to achieve a stable connection. The connection between the snap-fit ​​structure 3 and the rigid plastic pipe allows the lower collar 2 to withstand greater reaction force. When the rigid plastic pipe generates backflow pressure, the lower collar 2 is less likely to be pushed out of the rigid plastic pipe by the backflow pressure, thus preventing damage to the connection's stability and sealing. This prevents backflow from the rigid plastic pipe from overflowing into the room, affecting the sanitary environment, and causing incalculable losses. Furthermore, when it is necessary to disconnect the external hose from the rigid plastic pipe, simply rotate the pressure ring structure 4 in the opposite direction. The downward pressing component moves upward to a predetermined displacement within the limited movement distance of the trapezoidal groove 23 to release the compression on the snap-fit ​​structure 3, thereby causing the sealing component and the plug-in component of the snap-fit ​​structure 3 to retract together to restore their original shape. At this time, neither the sealing component nor the plug-in component forms a stable connection with the inner wall of the rigid plastic tube, which makes it easy to remove the lower collar 2 together with the snap-fit ​​structure 3 from the cavity of the rigid plastic tube. This enables efficient and convenient pipe connection and disconnection between the hose and the rigid plastic tube, and the pipe connection has good stability and sealing during the pipe connection.

[0024] In this embodiment, the snap-fit ​​structure 3 includes a toothed ring 31 sleeved on the lower connecting ring 22 for embedding into the inner wall of the rigid plastic tube to achieve snap-fit ​​connection and fixation, and a lower sealing ring 32 sleeved on the lower connecting ring 22 and located above and below the toothed ring 31 for sealing and abutting with the inner wall of the rigid plastic tube. The pressure ring structure 4 includes a lower pressure ring 41 sleeved on the upper end of the lower connecting ring 22 for squeezing and adjusting the toothed ring 31 and the lower sealing ring 32 under the limitation of the lower ring seat 21 to facilitate connection and disassembly with the rigid plastic tube. The top of the lower pressure ring 41 is provided with a lower engagement portion 42 formed by a plurality of unidirectional teeth arranged in a circular pattern. The inner wall of the lower engagement portion 42 is also provided with a plurality of limiting protrusions 43 arranged in a circular pattern for engaging with the outer edge of the corresponding trapezoidal groove 23 to limit the movement position. It also includes an upper pressure ring 44 sleeved on the lower connecting ring 22 above the lower engagement portion 42 for engaging with the lower engagement portion 42 to control the movement of the lower pressure ring 41. The upper pressure ring 44 includes a movable ring seat 100 sleeved on the lower connecting ring 22 and located above the lower engagement portion 42. The movable ring seat 100 is sleeved with the upper ring seat 11 to limit its upward movement. At the bottom of the movable ring seat 100, there is an upper engagement portion 200 formed by a plurality of unidirectional teeth arranged in a circular pattern. The upper engagement portion 200 engages with the lower engagement portion 42. A rotating handle 300 for pushing the movable ring seat 100 is also provided on both sides of the movable ring seat 100. During use, with the lower ring seat 21 of the lower collar 2 positioned, the first lower sealing ring 32, the toothed ring 31, and the second lower sealing ring 32 of the snap-fit ​​structure 3 are sequentially fitted onto the lower connecting ring 22. The lower pressure ring 41 and the lower engaging part 42 of the pressure ring structure 4, together with the limiting protrusion 43 and the upper pressure ring 44, are then fitted onto the lower connecting ring 22. The snap-fit ​​block 12 and the trapezoidal groove 23 are then mutually sealed and snap-fitted together, thereby securely connecting the upper ring seat 11 and the lower connecting ring 22 to form a pipe connector. At this time, the movable ring seat 100 of the upper pressure ring 44 is fitted onto the upper ring seat 11, with the upper ring seat 11 limiting the upward movement position of the movable ring seat 100. Next, the lower collar 2, together with the snap-fit ​​structure 3, is inserted into the cavity of the rigid plastic tube. Under the constraint of the lower collar seat 21, the rotating handle 300 is held to rotate the movable collar seat 100, causing the upper engagement part 200 to rotate in a predetermined direction. The engagement of the upper engagement part 200, which is composed of unidirectional teeth arranged in an inclined gradient, with the lower engagement part 42 pushes the lower engagement part 42 to drive the lower pressure ring 41, together with the limiting protrusion 43, to rotate downward. During this process, the corresponding limiting protrusion 43 moves from back to front along the bottom of the corresponding trapezoidal groove 23 to engage with the corresponding side of the trapezoidal groove 23 to lock the snap-fit ​​structure 3. At the same time, it can effectively limit the movement of the lower pressure ring 41 within a predetermined stroke.This causes the toothed ring 31 and the lower sealing ring 32 to be compressed downwards by the downward movement of the pressure ring 41, thereby causing the toothed ring 31 and the lower sealing ring 32 to elastically extend. At this time, the lower sealing ring 32 extends and tightly abuts against the inner wall of the rigid plastic tube to achieve a frictional seal connection. At the same time, the toothed ring 31 extends and inserts into the inner wall of the rigid plastic tube to achieve a stable connection. When the rigid plastic tube generates backwater pressure, the lower sleeve ring 2 located inside the rigid plastic tube can withstand a greater reaction force under the stable sealing connection between the snap-fit ​​structure 3 and the rigid plastic tube. This makes it less likely that the lower sleeve ring 2 will be pushed out of the rigid plastic tube by the backwater pressure, thereby destroying the stability and sealing of the connection. This prevents backwater from overflowing into the room, affecting the sanitary environment and causing incalculable losses. In addition, when it is necessary to disconnect the connection between the external hose and the rigid plastic tube, simply hold the handle 300 and rotate the movable ring seat 100 in the opposite direction to drive the upper engaging part 200 to rotate in a predetermined direction. The unidirectional teeth arranged in an inclined gradient form a... The engagement of the upper engagement portion 200 and the lower engagement portion 42 releases the pressure on the lower engagement portion 42. At this time, the corresponding limiting protrusion 43 moves from front to back along the bottom of the corresponding trapezoidal groove 23 to move the lower pressure ring 41 upward until the limiting protrusion 43 and the corresponding side of the trapezoidal groove 23 engage to unlock the snap-fit ​​structure 3. This allows the toothed ring 31 and the lower sealing ring 32 to naturally retract to return to their original state. At this time, neither the toothed ring 31 nor the lower sealing ring 32 forms a stable connection with the inner wall of the rigid plastic tube, which makes it easy to remove the lower sleeve ring 2 together with the snap-fit ​​structure 3, the pressure ring structure 4 and the upper sleeve ring 1 from the cavity of the rigid plastic tube. This achieves efficient and convenient pipe connection and disassembly between the hose and the rigid plastic tube. During the pipe connection, the frictional sealing connection between the lower sealing ring 32 and the inner wall of the rigid plastic tube, and the insertion and embedding of the toothed ring 31 into the inner wall of the rigid plastic tube, provide a stable connection and good stability and sealing of the pipe connection. ,

[0025] In specific use of this embodiment, firstly, when it is necessary to connect the external flexible hose to the rigid plastic hose, the connecting ring 14 of the upper collar 1 is pre-securely and sealed to the corresponding connector of the hose. Under the sealing action of the upper sealing ring 5, the connecting ring 14 is threadedly connected to the upper connecting ring 13. Secondly, under the position limitation of the lower ring seat 21 of the lower collar 2, the first lower sealing ring 32, the toothed ring 31, and the second lower sealing ring 32 of the snap-fit ​​structure 3 are sequentially fitted onto the lower connecting ring 22, and the lower pressure ring 41 and the lower engagement part 42 of the pressure ring structure 4, together with the limiting protrusion 43 and the upper... The pressure ring 44 is fitted onto the lower connecting ring 22, and then the insertion clip 12 and the trapezoidal groove 23 are sealed together, thereby firmly connecting the upper ring seat 11 and the lower connecting ring 22 to form a pipe connector. At this time, the movable ring seat 100 of the upper pressure ring 44 is fitted onto the upper ring seat 11 to limit the upward movement of the movable ring seat 100. Then, the lower sleeve 2 together with the insertion structure 3 is inserted into the cavity of the rigid plastic pipe. Then, under the limiting action of the lower ring seat 21, the movable ring seat 100 is rotated by holding the handle 300, which drives the upper engaging part 200 to move in a predetermined direction. The upper meshing part 200, composed of unidirectional teeth arranged at an inclined gradient, and the lower meshing part 42 engage to drive the lower meshing part 42, causing the lower pressure ring 41 and the limiting protrusion 43 to rotate downwards. During this process, the corresponding limiting protrusion 43 moves from back to front along the bottom of the corresponding trapezoidal groove 23 to engage with the corresponding side of the trapezoidal groove 23 to lock the snap-fit ​​structure 3. At the same time, it effectively limits the movement of the lower pressure ring 41 within a predetermined stroke. Thus, the downward movement of the lower pressure ring 41 compresses the toothed ring 31 and the lower sealing ring 32, thereby causing the toothed ring 31 and the lower sealing ring to... Each of the 32 elastically extends. At this time, the lower sealing ring 32 extends and tightly abuts against the inner wall of the rigid plastic tube to achieve a frictional sealing connection. At the same time, the toothed ring 31 extends and inserts into the inner wall of the rigid plastic tube to achieve a stable connection. When the rigid plastic tube generates backwater pressure, the lower sleeve ring 2 located inside the rigid plastic tube can withstand a greater reaction force under the stable sealing connection between the snap-fit ​​structure 3 and the rigid plastic tube. This makes it less likely that the lower sleeve ring 2 will be pushed out of the rigid plastic tube by the backwater pressure, thereby destroying the stability and sealing of the connection. This prevents backwater from overflowing into the room, affecting the sanitary environment and causing incalculable losses.Finally, when it is necessary to disconnect the connection between the external hose and the rigid plastic tube, simply hold the handle 300 and rotate the movable ring seat 100 in the opposite direction to drive the upper engagement part 200 to rotate in a predetermined direction. The engagement of the upper engagement part 200, composed of unidirectional teeth arranged in an inclined gradient, with the lower engagement part 42 releases the pressure on the lower engagement part 42. At this time, the corresponding limiting protrusion 43 moves from front to back along the bottom of the corresponding trapezoidal groove 23 to move the lower pressure ring 41 upwards until the limiting protrusion 43 engages with the corresponding side of the trapezoidal groove 23 to unlock the snap-fit ​​structure 3, thereby releasing the toothed ring 3. 1. The lower sealing ring 32 naturally retracts to return to its original shape. At this time, neither the toothed ring 31 nor the lower sealing ring 32 forms a stable connection with the inner wall of the rigid plastic tube. This facilitates the removal of the lower collar 2, along with the snap-fit ​​structure 3, the pressure ring structure 4, and the upper collar 1, from the cavity of the rigid plastic tube. This achieves efficient and convenient pipe connection and disconnection between the flexible hose and the rigid plastic tube. Furthermore, during pipe connection, the frictional sealing connection between the lower sealing ring 32 and the inner wall of the rigid plastic tube, and the insertion and embedding of the toothed ring 31 into the inner wall of the rigid plastic tube, provide a stable and secure connection for the pipe connection.

[0026] In summary, the present invention, with the above-described structure, has the advantages of enabling efficient and convenient pipe connection and disassembly between flexible hoses and rigid plastic pipes, and providing good stability and sealing of the pipe connection.

[0027] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A connection for pipes, comprising an upper collar (1) and a lower collar (2) for connection with external pipes and for interfitting connection cooperation; characterized in that: A snap-fit ​​structure (3) is fitted on the lower collar (2), and a pressure ring structure (4) is fitted on the lower collar (2) and above the snap-fit ​​structure (3) for adjusting the snap-fit ​​structure (3) to contract or expand under the limitation of the upper collar (1) so as to facilitate connection and disassembly with external pipes.

2. The pipe coupling according to claim 1, wherein: The upper collar (1) includes an upper collar seat (11) for positioning the pressure ring structure (4). A plurality of insertion blocks (12) for inserting and engaging with the lower collar (2) are provided at the bottom of the upper collar seat (11). An upper connecting ring (13) is also provided at the top of the upper collar seat (11). The upper collar seat (14) also includes a sleeve ring (14) for securely connecting with an external hose and for threaded connection with the upper connecting ring (13).

3. The pipe coupling according to claim 2, wherein: The lower collar (2) includes a lower collar seat (21) for inserting into an external rigid plastic tube and for defining the position of the buckle structure (3). The top of the lower collar seat (21) is provided with a lower connecting ring (22) for engaging with the buckle structure (3) and the pressure ring structure (4). The outer wall of the lower connecting ring (22) is provided with a plurality of trapezoidal grooves (23) for engaging with the corresponding plug-in block (12) and locking, and the bottom of the trapezoidal grooves (23) gradually rises from front to back.

4. The pipe coupling according to claim 3, wherein: The snap-fit ​​structure (3) includes a toothed ring (31) sleeved on the lower connecting ring (22) for embedding into the inner wall of the rigid plastic tube to achieve snap-fit ​​connection and fixation, and a lower sealing ring (32) sleeved on the lower connecting ring (22) and located above and below the toothed ring (31) for sealing and abutting with the inner wall of the rigid plastic tube.

5. The pipe coupling according to claim 4, wherein: The pressure ring structure (4) includes a lower pressure ring (41) sleeved on the upper end of the lower connecting ring (22) for squeezing and adjusting the toothed ring (31) and the lower sealing ring (32) under the limitation of the lower ring seat (21) to facilitate connection and disassembly with the rigid plastic tube. The top of the lower pressure ring (41) is provided with a lower engagement part (42) formed by a plurality of unidirectional teeth arranged in a circular pattern. The inner wall of the lower engagement part (42) is also provided with a plurality of limiting protrusions (43) arranged in a circular pattern for engaging with the outer edge of the corresponding trapezoidal groove (23) to limit the active position. It also includes an upper pressure ring (44) sleeved on the lower connecting ring (22) above the lower engagement part (42) for engaging with the lower engagement part (42) to control the movement of the lower pressure ring (41).

6. The pipe connector according to claim 5, characterized in that: The upper pressure ring (44) includes a movable ring seat (100) sleeved on the lower connecting ring (22) and located above the lower engagement part (42). The movable ring seat (100) is sleeved with the upper ring seat (11) to limit its upward movement. At the bottom of the movable ring seat (100), there is an upper engagement part (200) formed by a plurality of unidirectional teeth arranged in a circular pattern. The upper engagement part (200) engages with the lower engagement part (42). A rotating handle (300) is provided on both sides of the movable ring seat (100) for pushing the movable ring seat (100) to move.

7. The pipe connector according to any one of claims 2 to 6, characterized in that: An upper sealing ring (5) is embedded in the sleeve ring (14) to increase the sealing performance of the connection between the sleeve ring (14) and the upper connecting ring (13).

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