Plastic pipe coupling joint structure

Abstract

This invention relates to the field of pipe connection technology, specifically to a plastic pipe connection joint structure, including a connecting cylinder, a locking sleeve, a compression ring, a clamping arc plate, and auxiliary components. In this invention, the deformation sealing of the compression rings on both sides of the connecting cylinder, combined with the contact sealing of the plastic pipe by the internal clamping arc plate, forms a four-point seal between the two plastic pipes, improving sealing performance in terms of quantity. Secondly, the clamping arc plate, targeting the opening of the plastic pipe and pressing it against the inner wall of the mating groove, reduces the possibility of water entering between the plastic pipe and the inner wall of the mating groove, fundamentally reducing the probability of water pressure gradually affecting the overall sealing performance. Furthermore, the self-locking components form multiple rectangular self-locking frames between the two plastic pipes, further enhancing the overall sealing performance and stability, facilitating adaptation to long-term operating conditions.

Description

Technical Field

[0001] This invention relates to the field of pipe connection technology, specifically to a plastic pipe connection joint structure. Background Technology

[0002] During operation, due to factors such as pipe length, installation space and construction conditions, it is often necessary to use a connector to connect two plastic pipes, and to maintain the required sealing performance and strength of the connection area through the connector.

[0003] Currently, the aforementioned plastic pipes and the need to connect two plastic pipes are commonly seen in scenarios such as building construction, municipal water supply and drainage, and industrial production. Due to factors such as the installation and usage environment, these pipes are used continuously for a medium to long period after a single installation. Furthermore, under these usage conditions, a certain pressure is maintained inside the plastic pipe, so a certain sealing performance is required in the connection area of ​​the joint.

[0004] Currently, for plastic pipe connections in the above-mentioned situations, crimp connections and compression fittings are commonly used. These connection methods typically involve connecting two plastic pipes to a central connector and sealing them by pressing or fitting rubber rings at both ends. Therefore, there are two sealing positions at the connection between the two plastic pipes.

[0005] The above-mentioned operation process has the following problems: During long-term operation, water will gradually enter the area between the plastic pipe and the inner wall of the connector due to the pressure of water, and eventually affect the corresponding ring sealing area, thus affecting the overall connection sealing performance. Secondly, after long-term use, the rubber ring will age due to factors such as aging. Although white tape is usually wrapped around the connection, it is difficult to alleviate the impact of aging on the sealing performance. Summary of the Invention

[0006] Therefore, it is necessary to provide a plastic pipe connection joint structure to solve the problems of the prior art.

[0007] This application provides a plastic pipe connector structure, including: a connecting cylinder, which is composed of an integrated section in the middle and mating sections on both sides. The diameter of the integrated section is larger than the diameter of the mating sections. A mating groove is provided at the opening of the connecting cylinder. The plastic pipe is installed into the mating groove and the end of the plastic pipe is tightly attached to the side wall of the mating groove. A thread is provided on the outer axial surface of the mating section.

[0008] Locking sleeves are provided on both the left and right sides of the connecting cylinder. The locking sleeves are engaged with the threaded sections of the connecting cylinder. The corresponding openings of the locking sleeves and the connecting cylinder are provided with compression rings for locking the plastic tube and sealing the connecting cylinder.

[0009] The integrated section is provided with two left-right distributed internal locking components that cooperate with the plastic tube. The internal locking components include pressing arc plates. Two pressing arc plates are symmetrically distributed vertically and vertically within the integrated section. The pressing arc plates are located in the docking groove. An auxiliary component is provided between the two pressing arc plates and the inner wall of the docking groove. The auxiliary component makes the plastic tube fit tightly against the inner wall of the docking groove.

[0010] A self-locking assembly is provided between the integrated section and the locking sleeve. The self-locking assembly includes a transmission component and a rotating disk. The rotating disk is rotatably mounted on the end face of the locking sleeve facing the integrated section. The transmission component corresponding to the pressing arc plate is mounted on the rotating disk. When the locking sleeve is tightened, the locking transmission component is locked so that the pressing arc plate presses the plastic tube, thus forming a self-locking structure.

[0011] According to an advantageous embodiment, the compression ring is sleeved on the plastic tube and located between the locking sleeve and the mating section. The inner diameter of the compression ring is the same as the outer diameter of the plastic tube, and the minimum inner diameter of the locking sleeve is the same as the outer diameter of the plastic tube, while the maximum inner diameter is the same as the outer diameter of the mating section.

[0012] According to an advantageous embodiment, the inner side of the locking sleeve on the left side has a threaded groove and an arc-shaped surface with an inner diameter that decreases sequentially from right to left.

[0013] The two compression rings are symmetrical. The left compression ring consists of rubber section one, mating section and rubber section two from right to left. The mating section of the compression ring fits into the arc surface of the locking sleeve. The inner side of the opening of the mating section is chamfered. When the locking sleeve is tightened, the compression ring is pushed by its arc surface and the corresponding rubber sections one and two are squeezed.

[0014] According to an advantageous embodiment, the internal locking assembly further includes a sliding frame, and two sliding frames are symmetrically distributed vertically within the integrated section, with a pressing arc plate fixedly mounted on the sliding frame.

[0015] The two pressing arc plates that are opposite each other on the left and right are symmetrical. Taking the pressing arc plate on the upper left as an example, the transverse section of the pressing arc plate on the upper left is a straight section and an inclined section from right to left. The inclined section slopes downward from right to left.

[0016] According to an advantageous embodiment, the auxiliary component includes extrusion strips, and a plurality of extrusion strips distributed on the outer arc surface of the straight section of the pressing arc plate are fixedly disposed thereon, and an arc-shaped groove corresponding to the extrusion strips is opened on the inner wall of the mating groove.

[0017] According to an advantageous embodiment, the inner wall of the docking groove is fixedly provided with two symmetrical protrusions, and the protrusions are located between two corresponding pressing arc plates.

[0018] According to an advantageous embodiment, the self-locking assembly further includes receiving grooves, and two receiving grooves are provided in the integrated section, which are distributed vertically. A rod group corresponding to the sliding frame is slidably arranged in the integrated section, and the rod group includes two sliding rods distributed horizontally with vertical axes. The sliding rods pass through the connecting cylinder into the receiving grooves and are fixedly connected to the corresponding sliding frame.

[0019] The sliding rod has an inclined groove on one side near the center of the integrated section. The inclined groove on the left sliding rod slopes from top to bottom to the left. The transmission component has a through groove, and the sliding rod is located in the through groove. A wedge block that cooperates with the corresponding inclined groove is fixedly installed on the inner wall of the through groove.

[0020] According to an advantageous embodiment, the free end of the transmission member is a threaded rod, and a nut is threaded onto the transmission member.

[0021] In summary, the present invention has the following beneficial effects: The present invention achieves a four-point seal between the two plastic tubes by using the deformation sealing of the extrusion rings on both sides of the connecting cylinder in conjunction with the contact sealing of the internal pressing arc plate against the plastic tube, thereby improving the sealing performance in terms of quantity. Secondly, the pressing arc plate targets the opening of the plastic tube and presses it against the inner wall of the docking groove, reducing the possibility of water entering between the plastic tube and the inner wall of the docking groove, thus fundamentally reducing the probability of water pressure gradually affecting the overall sealing performance. Furthermore, the self-locking assembly forms multiple rectangular self-locking frames between the two plastic tubes, further enhancing the overall sealing performance and stability, making it easier to adapt to long-term operating conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A schematic diagram of a plastic pipe connection joint structure according to an embodiment of the present invention is shown;

[0024] Figure 2 This diagram shows a partial exploded cross-sectional view of a plastic pipe connector structure according to an embodiment of the present invention.

[0025] Figure 3 This diagram shows a partial cross-sectional front view of the structure between the plastic tube, the connecting cylinder, and the clamping arc plate according to an embodiment of the present invention.

[0026] Figure 4 A schematic diagram of the structure of the extrusion ring provided according to an embodiment of the present invention is shown;

[0027] Figure 5 A partial cross-sectional perspective view of the integrated segment and the docking segment provided according to an embodiment of the present invention is shown.

[0028] Figure 6 This diagram shows a partial cross-sectional side view of the structure between the connecting cylinder, the pressing arc plate, and the protruding strip according to an embodiment of the present invention.

[0029] Figure 7 A three-dimensional structural diagram of the space between the pressing arc plate and the extrusion strip according to an embodiment of the present invention is shown;

[0030] Figure 8 A partial cross-sectional front view of the oblique groove, wedge block and sliding rod provided according to an embodiment of the present invention is shown.

[0031] The above-mentioned attached drawings include the following reference numerals: 1. Connecting cylinder; 10. Integrated section; 11. Butt joint section; 12. Butt joint groove; 2. Locking sleeve; 3. Extrusion ring; 30. Rubber section one; 31. Fitting section; 32. Rubber section two; 4. Inner locking assembly; 40. Pressing arc plate; 41. Sliding frame; 5. Auxiliary assembly; 50. Extrusion strip; 51. Arc groove; 52. Protruding strip; 6. Self-locking assembly; 60. Rotating disk; 61. Transmission component; 62. Receiving groove; 63. Sliding rod; 64. Inclined groove; 65. Wedge block; 7. Plastic tube. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] like Figure 1 , Figure 3 and Figure 5 As shown, a plastic pipe connector structure includes: a connecting cylinder 1, which is composed of an integrated section 10 in the middle and mating sections 11 on both sides. The diameter of the integrated section 10 is larger than the diameter of the mating section 11. A mating groove 12 is provided at the opening of the connecting cylinder 1. A plastic pipe 7 is installed in the mating groove 12 and the end of the plastic pipe 7 is tightly attached to the side wall of the mating groove 12. A thread is provided on the outer axial surface of the mating section 11.

[0034] Locking sleeves 2 are provided on both the left and right sides of the connecting cylinder 1. The locking sleeves 2 are engaged with the threaded section of the connecting cylinder 1. The corresponding openings of the locking sleeves 2 and the connecting cylinder 1 are provided with compression rings 3 for locking the plastic tube 7 and sealing the connecting cylinder 1.

[0035] like Figure 2 , Figure 3 and Figure 5 As shown, two internal locking components 4 are provided in the integrated section 10, which are distributed left and right and cooperate with the plastic tube 7. The internal locking components 4 include pressing arc plates 40. Two pressing arc plates 40 are symmetrically distributed vertically and vertically in the integrated section 10. The pressing arc plates 40 are located in the docking groove 12. An auxiliary component 5 is provided between the two pressing arc plates 40 and the inner wall of the docking groove 12. The auxiliary component 5 makes the plastic tube 7 fit tightly against the inner wall of the docking groove 12.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a self-locking assembly 6 is provided between the integrated section 10 and the locking sleeve 2. The self-locking assembly 6 includes a transmission component 61 and a rotating disk 60. The rotating disk 60 is rotatably mounted on the end face of the locking sleeve 2 facing the integrated section 10. The transmission component 61 corresponding to the pressing arc plate 40 is sleeved on the rotating disk 60. After the locking sleeve 2 is tightened, the locking transmission component 61 is locked so that the pressing arc plate 40 presses the plastic tube 7, forming a self-locking structure.

[0037] When not installed, the two adjacent clamping arc plates 40 are close to each other. At this time, the operator first puts the extrusion ring 3 and the locking sleeve 2 onto the plastic tube 7 respectively (so that the extrusion ring 3 is located between the corresponding docking groove 12 and the locking sleeve 2). Then, the docking end of the plastic tube 7 is installed into the docking groove 12, and the clamping arc plate 40 is inserted into the plastic tube 7. After that, the operator gradually tightens the locking sleeve 2 onto the docking section 11. During the tightening process, the locking sleeve 2 pushes the extrusion ring 3 and causes the extrusion ring 3 to deform, increasing the friction and sealing between the opening of the connecting cylinder 1 and the plastic tube 7, thereby forming a lock on the corresponding position on the plastic tube 7. Secondly, during the process of locking the transmission component 61 and the locking sleeve 2 after the locking sleeve 2 is tightened, the corresponding two pressing arc plates 40 are moved away from each other. The pressing arc plates 40 press the plastic tube 7 against the inner wall of the docking groove 12. Finally, the self-locking component 6 locks the rotating disk 60, the transmission component 61 and the pressing arc plate 40, forming two rectangular self-locking frames on the left and right, which locks the locking sleeve 2 and the pressing arc plate 40, completing the installation process of the connecting joint. In summary, the outer two external extrusion locking and the middle internal pressing locking formed between the two plastic tubes 7 improve the stability after connection and the overall sealing strength.

[0038] It should be further explained that the areas and end faces of the plastic tube 7 that are to be joined are manually cleaned before the connection operation to ensure that the surface cleanliness meets the connection requirements. Secondly, the contact end faces of the plastic tube 7 and the inner wall of the docking groove 12 are flat to avoid uneven fit affecting the overall connection quality. The above-described features are known features of the plastic tube 7 and belong to the external existing technology, which will not be elaborated further.

[0039] like Figure 2 and Figure 3 As shown, the compression ring 3 is sleeved on the plastic tube 7 and located between the locking sleeve 2 and the docking section 11. The inner diameter of the compression ring 3 is the same as the outer diameter of the plastic tube 7. The minimum inner diameter of the locking sleeve 2 is the same as the outer diameter of the plastic tube 7, and the maximum inner diameter is the same as the outer diameter of the docking section 11.

[0040] like Figure 2 , Figure 3 and Figure 4 As shown, taking the left locking sleeve 2 as an example, the inner side of the left locking sleeve 2 has a threaded groove and an arc-shaped surface with an inner diameter that decreases from right to left.

[0041] The two compression rings 3 are symmetrical. Taking the left compression ring 3 as an example, the left compression ring 3 consists of rubber section 1 30, mating section 31 and rubber section 2 32 from right to left. The mating section 31 of the compression ring 3 fits with the arc surface of the locking sleeve 2. The inner side of the opening of the mating section 11 is chamfered. When the locking sleeve 2 is tightened, the compression ring 3 is pushed by its arc surface and the corresponding rubber section 1 30 and rubber section 2 32 are squeezed.

[0042] First, manually install the compression ring 3 and locking sleeve 2 onto the plastic tube 7, ensuring they are installed in the designated orientation. Then, manually insert the plastic tube 7 into the mating groove 12 in the connecting cylinder 1, ensuring the end face of the plastic tube 7 is flush with the inner wall of the mating groove 12. At this point, from right to left, the sequence is: locking sleeve 2, compression ring 3, connecting cylinder 1, compression ring 3, and locking sleeve 2. Manually move the compression ring 3 so that it initially enters the chamfered area of ​​the mating groove 12. Subsequently, manually rotate the locking sleeve 2, allowing the threaded groove on the locking sleeve 2 to engage with the threaded connection between the threaded groove and the outer side of the mating section 11. As the locking sleeve 2 gradually approaches along the axis of the connecting shaft, the arc-shaped surface of the locking sleeve 2 contacts the rubber segment 32 of the extrusion ring 3 and pushes the extrusion ring 3 to move synchronously. The rubber segment 30 on the extrusion ring 3 completely enters the chamfered area of ​​the mating groove 12. As the locking sleeve 2 gradually tightens, both the rubber segment 30 and the rubber segment 32 of the extrusion ring 3 deform. Finally, when the locking sleeve 2 can no longer rotate and tighten, sealing rings are formed on both the left and right sides of the extrusion ring 3 through the deformation of the rubber segment 30 and the rubber segment 32. The overall sealing performance is improved by sealing at two points on the same side.

[0043] like Figure 2 , Figure 3 and Figure 7 As shown, the inner locking component 4 also includes a sliding frame 41. Two sliding frames 41 are symmetrically distributed vertically within the integrated section 10, and the pressing arc plate 40 is fixedly mounted on the sliding frame 41.

[0044] The two pressing arc plates 40 are symmetrical and are located opposite each other. Taking the pressing arc plate 40 on the upper left as an example, the transverse section of the pressing arc plate 40 on the upper left is a straight section and an inclined section from right to left. The inclined section is inclined downward from right to left. The end face of the inclined section of the pressing arc plate 40 is chamfered.

[0045] like Figure 2 , Figure 3 and Figure 5 As shown, the auxiliary component 5 includes extrusion strips 50. Multiple extrusion strips 50 are fixedly arranged on the outer arc surface of the straight section of the pressing arc plate 40. The inner wall of the docking groove 12 is provided with an arc-shaped groove 51 corresponding to the extrusion strips 50.

[0046] like Figure 5 and Figure 6 As shown, two symmetrical protrusions 52 are fixedly provided on the inner wall of the docking groove 12, and the protrusions 52 are located between the corresponding two pressing arc plates 40.

[0047] In the initial state, the distance between the two opposing pressing arc plates 40 is the smallest. In this state, the area formed by the two pressing arc plates 40 is smaller than the vertical cross-section of the inner diameter of the plastic tube 7. In addition, the inclined section of the pressing arc plate 40 facilitates the manual installation of the plastic tube 7. After the installation is completed, the pressing arc plate 40 is located inside the plastic tube 7, and then the subsequent installation process can be carried out.

[0048] Before manually tightening the locking sleeve 2, the two pressing arc plates 40 are manually moved so that they are both tightly against the inner wall of the plastic tube 7. Subsequently, the self-locking component 6 causes the two opposing pressing arc plates 40 to gradually move away from each other. During the movement of the pressing arc plates 40, the plastic tube 7 is gradually pressed tightly against the inner wall of the docking groove 12. As the pressing arc plates 40 move gradually, the extrusion strips 50 on the pressing arc plates 40 extrude the plastic tube 7 and deform the contact area between the plastic tube 7 and the extrusion strips 50, and gradually extrude it into the corresponding arc groove 51. The protrusion strips 52 cause the area between the two pressing arc plates 40 on the plastic tube 7 to arch in this state, avoiding the problem of gaps between the plastic tube 7 and the inner wall of the docking groove 12 caused by the extrusion strips 50. Therefore, the above method not only improves the installation stability by increasing the frictional resistance between the plastic tube 7 and the inner wall of the docking groove 12, but also improves the sealing performance after the pressing arc plates 40 press the plastic tube 7.

[0049] like Figure 1 , Figure 3 and Figure 5 As shown, the self-locking component 6 also includes a receiving groove 62. Two receiving grooves 62 are provided in the integrated section 10, which are distributed vertically. A rod group corresponding to the sliding frame 41 is slidably arranged in the integrated section 10. The rod group includes two sliding rods 63 distributed horizontally and vertically. The sliding rods 63 pass through the connecting cylinder 1 into the receiving groove 62 and are fixedly connected to the corresponding sliding frame 41. A cover plate for covering and protecting the sliding rods 63 is snapped onto the outside of the receiving groove 62.

[0050] like Figure 3 and Figure 8 As shown, a slanted groove 64 is provided on the side of the sliding rod 63 near the center of the integrated section 10. Taking the slanted groove 64 on the left sliding rod 63 as an example, the slanted groove 64 on the left sliding rod 63 is inclined to the left from top to bottom. A through groove is provided on the transmission component 61. The sliding rod 63 is located in the through groove. A wedge block 65 that cooperates with the corresponding slanted groove 64 is fixedly provided on the inner wall of the through groove.

[0051] When assembling the clamping arc plate 40 and the transmission component 61, the transmission component 61 is first installed into the corresponding receiving groove 62, and the through groove on the transmission component 61 is positioned at the set position. Subsequently, the sliding rod 63 and the clamping arc plate 40 are manually installed, and the sliding rod 63 passes through the corresponding through groove. In addition, the area where the sliding rod 63 passes through the connecting cylinder 1 is sealed. Currently, a sealing sleeve fitted on the sliding rod 63 can be set in the receiving groove 62. Through the cooperation between the sealing sleeve and the transmission component 61, common sealing methods such as rubber rings can be used. Therefore, during the up and down movement of the sliding rod 63, the internal sealing performance will not be affected. This technical feature can be replaced by existing technologies that maintain sealing performance. In summary, it belongs to the external existing technical features, and will not be elaborated further. In addition, after completing all the installation and locking steps, the cover plate is manually installed into the set position by means of plug-in installation, etc., to protect the sliding rod 63 and prevent the sliding rod 63 from being affected by external factors and affecting the tight sealing effect of the clamping arc plate 40.

[0052] During operation, when installing the plastic tube 7, the operator controls the position of the clamping arc plate 40 by moving the corresponding sliding rod 63 to facilitate the insertion and installation of the plastic tube 7. After the plastic tube 7 is inserted, the operator moves the sliding rod 63 to drive the clamping arc plate 40 to move synchronously, so that the two corresponding clamping arc plates 40 move away from each other, that is, the clamping arc plate 40 initially clamps the plastic tube 7.

[0053] like Figure 3 As shown, the free end of the transmission component 61 is a threaded rod, and a nut is threaded onto the transmission component 61.

[0054] After the initial clamping of the clamping arc plate 40 and the installation of the locking sleeve 2 are completed, the locking sleeve 2 cannot be rotated manually by direct twisting. During the aforementioned process, the initial clamping of the clamping arc plate 40 is achieved by manually pulling the sliding rod 63. Therefore, the inclined groove 64 and the wedge block 65 are now facing each other. The nut is manually tightened onto the transmission component 61 and then tightened using a wrench or external tightening equipment. As the nut is gradually tightened, the transmission component 61 tends to move towards the nut. Therefore, the engaging block on the transmission component 61 gradually enters the inclined groove 64 and presses against the inner wall of the inclined groove 64, causing the sliding rod 63 to drive the corresponding clamping arc plate 40. The material continues to move, so the two clamping arc plates 40 continue to move away. Eventually, both clamping arc plates 40 press tightly against the plastic tube 7, forming an internal seal at the opening of the plastic tube 7. After the nut is tightened, not only are the clamping arc plates 40 locked, but the locking sleeve 2 is also locked a second time. Thus, the transmission component 61, the locking sleeve 2, and the integrated section 10 together form a rectangular self-locking frame, which avoids the problem of the locking sleeve 2 loosening due to long-term use and affecting the sealing performance at both ends of the connecting cylinder 1. In addition, in order to ensure the anti-loosening performance of the nut itself, an anti-loosening nut can be installed on the transmission component 61. This technical feature belongs to the external existing technical features and will not be described in detail.

[0055] It should be further explained that existing connection solutions typically employ compression fittings and compression sleeves. These methods use rubber rings as the primary sealing component, and deformation of the rubber rings through physical processes such as compression ensures overall sealing performance. However, current connection methods usually involve a single seal at the plastic tube 7, meaning there are two seals when two plastic tubes 7 are joined. Over time, issues such as aging of the rubber rings reduce the sealing performance at the joint of the plastic tubes 7. Currently, white tape is used to reinforce the seal, but these steps still affect the sealing performance after prolonged use. This technical solution adds a locking sleeve 2, a compression ring 3, a pressing arc plate 40, and a self-locking component 6. The two outer compression locking parts formed between the two plastic tubes 7 and the inner pressing locking part in the middle prevent water leakage at the joint between the plastic tubes 7 and the docking groove 12, which would affect the overall sealing performance. The self-locking component 6 maintains the overall frame locking stability, thus improving the stability of the two plastic tubes 7 after connection and the overall sealing strength, which is convenient for long-term operation. The above-mentioned added parts are all existing conventional mechanical parts, which can be used for a long time after a single installation. In summary, this technical solution is a specific improvement made entirely based on the defects of the existing technology and to solve the defects of the technology.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A plastic pipe connection joint structure, characterized in that, include: The connecting cylinder consists of an integrated section in the middle and docking sections on both sides. A docking groove is provided at the opening of the connecting cylinder. A plastic tube is installed into the docking groove and the end of the plastic tube is in close contact with the side wall of the docking groove. A thread is provided on the outer axial surface of the docking section. Locking sleeves are provided on both the left and right sides of the connecting cylinder. The locking sleeves are engaged with the threaded sections of the connecting cylinder. The corresponding openings of the locking sleeves and the connecting cylinder are provided with compression rings for locking the plastic tube and sealing the connecting cylinder. The integrated section is provided with two left-right distributed internal locking components. The internal locking components include pressing arc plates. The integrated section is provided with two pressing arc plates that are symmetrically distributed vertically. The pressing arc plates are located in the docking groove. Auxiliary components are provided between the two pressing arc plates and the inner wall of the docking groove. The auxiliary components make the plastic tube fit tightly against the inner wall of the docking groove. A self-locking assembly is provided between the integrated section and the locking sleeve. The self-locking assembly includes a transmission component and a rotating disk. The rotating disk is rotatably mounted on the end face of the locking sleeve facing the integrated section. The transmission component corresponding to the pressing arc plate is mounted on the rotating disk. After the locking sleeve is tightened, the locking transmission component is locked so that the pressing arc plate presses the plastic tube, thus forming a self-locking structure.

2. The plastic pipe connection joint structure according to claim 1, characterized in that: The compression ring is sleeved on the plastic tube and located between the locking sleeve and the docking section. The inner diameter of the compression ring is the same as the outer diameter of the plastic tube. The minimum inner diameter of the locking sleeve is the same as the outer diameter of the plastic tube, and the maximum inner diameter is the same as the outer diameter of the docking section.

3. The plastic pipe connection joint structure according to claim 1, characterized in that: The inner side of the locking sleeve on the left side has, from right to left, a threaded groove and an arc-shaped surface with an inner diameter that decreases from right to left; The two compression rings are symmetrical. The left compression ring consists of rubber section one, mating section and rubber section two from right to left. The mating section of the compression ring fits into the arc surface of the locking sleeve. The inner side of the opening of the mating section is chamfered. When the locking sleeve is tightened, the compression ring is pushed by its arc surface and the corresponding rubber sections one and two are squeezed.

4. The plastic pipe connection joint structure according to claim 1, characterized in that: The internal locking component also includes a sliding frame, and two sliding frames are symmetrically distributed vertically within the integrated section, with the pressing arc plate fixedly mounted on the sliding frame; The two pressing arc plates facing each other on the left and right are symmetrical. The transverse section of the pressing arc plate on the upper left side consists of a straight section and an inclined section from right to left, and the inclined section slopes downward from right to left.

5. The plastic pipe connection joint structure according to claim 1, characterized in that: The auxiliary component includes extrusion strips. Multiple extrusion strips are fixedly arranged on the outer arc surface of the straight section of the pressing arc plate, and an arc-shaped groove corresponding to the extrusion strips is opened on the inner wall of the docking groove.

6. The plastic pipe connection joint structure according to claim 1, characterized in that: The inner wall of the docking groove is fixedly provided with two symmetrical protrusions, and the protrusions are located between the corresponding two pressing arc plates.

7. The plastic pipe connection joint structure according to claim 1, characterized in that: The self-locking component also includes receiving slots. Two receiving slots are provided in the integrated section, and a rod group corresponding to the sliding frame is slidably arranged in the integrated section. The rod group includes two sliding rods distributed in the left and right with vertical axes. The sliding rods pass through the connecting cylinder into the receiving slots and are fixedly connected to the corresponding sliding frame. The sliding rod has an inclined groove on one side near the center of the integrated section. The inclined groove on the left sliding rod slopes from top to bottom to the left. The transmission component has a through groove, and the sliding rod is located in the through groove. A wedge block that cooperates with the corresponding inclined groove is fixedly installed on the inner wall of the through groove.

8. The plastic pipe connection joint structure according to claim 1, characterized in that: The free end of the transmission component is a threaded rod, and a nut is threaded onto the transmission component.

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