Sealed cable waterproof joint

Abstract

The application discloses a sealed cable waterproof joint and relates to the technical field of cable connection. The sealed cable waterproof joint comprises a first threaded sleeve fixed on a casing, a first threaded pipe, a second threaded pipe and a second threaded sleeve. The first threaded pipe penetrates through the first threaded sleeve and is in threaded connection with the first threaded sleeve. The second threaded pipe is fixedly connected with the first threaded pipe at one end outside the casing. The second threaded pipe is provided with a notch. The second threaded sleeve is in threaded connection with the second threaded pipe outside. The second threaded sleeve is provided with a flexible boss at one end far away from the casing inside. The notch on the second threaded pipe, the flexible boss inside the second threaded sleeve, a pressing piece and a flexible lining piece are used. Only one operation of screwing the second threaded sleeve is needed. The notch is synchronously driven to contract and clamp the cable in the radial direction. Axial pressure is transmitted by the pressing piece to make the sealing part expand in the radial direction. The sealing and clamping functions are integrated and linked. The installation steps are simplified. The assembly efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, specifically to a sealed waterproof cable connector. Background Technology

[0002] A waterproof cable connector is a sealed connection device used to protect cables from liquid ingress when they pass through a housing. It is widely used in industrial control boxes, outdoor power distribution equipment, and various electrical instruments. Common waterproof cable connectors typically consist of a threaded sleeve fixed to the housing and a lock nut, which clamps and waterproofs the cable by pressing a rubber seal.

[0003] Chinese invention patent application CN221328593U discloses a waterproof cable connector. After the cable is assembled, the air chamber is inflated through an inflation valve. The inflated air chamber expands and fills the gaps in the cable, securing the cable while effectively preventing water, mud, insects, rodents, harmful gases and other substances from entering the connector tube, and has a certain degree of shock resistance.

[0004] However, while the inflatable waterproof connector disclosed in prior art CN221328593U is convenient for maintenance, it relies on external inflation equipment and processes to expand and seal the air chamber. This limits its ease of installation and maintenance, as well as its adaptability to the working environment. Specifically, inflation is required for each installation or adjustment, which not only increases the installation steps and time but is also difficult to implement in situations where inflation tools or air sources are lacking. This affects the connector's immediate usability and wide applicability. In contrast, the traditional connection method of threaded sleeve and lock nut relies on axial compression to generate the clamping force of the seal on the cable. Furthermore, the seal performs both sealing and fastening functions simultaneously, which can easily lead to seal failure due to long-term use. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a sealed waterproof cable connector, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sealed waterproof cable connector, comprising a first threaded sleeve fixed to the housing, and further comprising: The first threaded tube passes through the first threaded sleeve and is threadedly connected to the first threaded sleeve. A second threaded tube is fixedly connected to one end of the tube located on the outside of the housing. The second threaded tube has a groove and the second threaded sleeve is threadedly connected to the outside of the second threaded tube. A flexible boss is provided on the inner side of the second threaded sleeve away from the housing. The flexible inner liner is located inside the second threaded pipe and consists of two parts: a sealing part and a fastening part. The extruded parts are arranged at equal intervals along the circumference within the fastening part, and the flexible inner liner is injection molded, covering part of the extruded parts during injection molding; The second threaded sleeve acts on the outside of the second threaded tube to tighten the groove so that the fastening part is squeezed by the extruder, and the flexible boss inside the second threaded sleeve squeezes the sealing part by the extruder so that the flexible inner liner is tightly fitted to the second threaded tube.

[0007] Furthermore, it also includes: A sealing gasket is fitted onto the outside of the first threaded pipe; The lock nut is threaded onto the first threaded tube. The sealing gasket is located between the first threaded sleeve and the locking nut, and the locking nut has a first anti-slip plate on the side facing the sealing gasket.

[0008] Furthermore, a partition is provided at the connection between the second threaded tube and the first threaded tube, and a rubber pad is provided on the outside of the second threaded tube; The second threaded sleeve has a second anti-slip plate for squeezing the rubber pad at one end facing the housing.

[0009] Furthermore, both sides of the partition are provided with anti-slip textures, and both sides of the partition are in contact with and pressed against the locking nut and the rubber pad, respectively.

[0010] Furthermore, the inner diameter of the second threaded tube at the sealing part is larger than its inner diameter at the fastening part, so that the inner wall of the second threaded tube forms a stepped structure.

[0011] Furthermore, the length of the slot is 2 / 3 of the length of the second threaded pipe, and the slot is located on the outside of the stepped structure.

[0012] Furthermore, a hexagonal nut seat is provided on the outer side of the second threaded sleeve, and a sealing ring is installed at the contact point between the second threaded sleeve and the cable.

[0013] Furthermore, the inner wall of the second threaded tube is provided with a receiving groove adapted to the extrusion, the receiving groove being located between two adjacent slots.

[0014] Furthermore, the extrusion member includes a first elongated plate disposed inside the fastening part and arranged along its axial direction. The first elongated plate has a horseshoe-shaped cross-section and is provided with supports at equal intervals that are adapted to the receiving groove. One end of the first elongated plate extends into the sealing part and is provided with a first push plate, and the other end of the first elongated plate passes through the fastening part and abuts against the flexible boss.

[0015] Furthermore, the extrusion member includes a second elongated plate disposed inside the fastening part and arranged along its axial direction. The cross-section of the second elongated plate is an inverted "V" shape, and a support plate adapted to the receiving groove is fixed on the second elongated plate. One end of the second elongated plate extends into the sealing part and is provided with a second push plate, and the other end of the second elongated plate passes through the fastening part and abuts against the flexible boss.

[0016] The present invention has the following beneficial effects: (1) The sealed cable waterproof connector, through the groove on the second threaded tube, the flexible boss inside the second threaded sleeve, the extrusion part and the flexible inner liner, allows the groove to shrink and radially clamp the cable in a single operation of tightening the second threaded sleeve, and the sealing part to expand radially by transmitting axial pressure through the extrusion part, thus realizing the integrated linkage of sealing and clamping functions, simplifying the installation steps and improving the assembly efficiency.

[0017] (2) This sealed cable waterproof joint, by setting the flexible inner liner as the sealing part and the fastening part, and using the extrusion part to perform the respective functions, realizes the physical separation and synergistic effect of the sealing function and the cable clamping and fixing function, avoids the stress relaxation or premature failure caused by a single elastic body being subjected to axial compression and radial clamping for a long time, thereby improving the sealing reliability and clamping stability of the joint for long-term use.

[0018] (3) The sealed cable waterproof joint is provided with a partition with anti-slip texture at the connection between the second threaded pipe and the first threaded pipe, and a rubber pad is provided on the outside of the second threaded pipe to cooperate with the second anti-slip plate on the second threaded sleeve. During the tightening process, the rubber pad is axially compressed and stored elastic potential energy. This elastic potential energy continues to act on the threaded pair, producing an anti-loosening effect, effectively resisting the loosening of the threaded connection caused by vibration or cable stress, and enhancing the holding force and overall stability of the joint under dynamic working conditions.

[0019] (4) The sealed cable waterproof connector optimizes the structural layout inside the second threaded tube by forming a stepped structure on the inner wall of the second threaded tube. The stepped structure provides ample space for the radial expansion of the sealing part and forms an axial limit, extending the sealing path. The groove of a specific length ensures that the fastening part area has sufficient elastic deformation capacity to generate effective clamping force, while avoiding the groove extending to the sealing area and affecting its continuity.

[0020] (5) This sealed cable waterproof connector provides two different cross-sectional extrusion parts: horseshoe and inverted "V". The horseshoe cross-section extrusion part is conducive to generating uniform radial clamping force and is suitable for occasions with high requirements for sealing uniformity; while the inverted "V" cross-section extrusion part can generate more concentrated radial force and is suitable for occasions with higher requirements for cable pull-out clamping force, which enhances the applicability and flexibility of the product and can meet the usage requirements under different working conditions.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention; Figure 3 In this invention Figure 2 The main view; Figure 4 This is an exploded view of Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the installation structure of the second threaded sleeve in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the installation structure of the flexible inner liner in Embodiment 1 of the present invention; Figure 7 This is a diagram showing the positional relationship between the second threaded tube and the extrusion component in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the extrusion component in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the installation structure of the second threaded pipe and the flexible inner liner in Embodiment 2 of the present invention; Figure 10 In this invention Figure 9 Side view; Figure 11 This is a schematic diagram of the installation structure of the extrusion component in Embodiment 2 of the present invention; Figure 12 This is a schematic diagram of the extrusion component in Embodiment 2 of the present invention.

[0023] In the diagram, 1. Housing; 2. First threaded sleeve; 3. First threaded tube; 4. Locking nut; 5. Second threaded sleeve; 6. Cable; 7. Sealing gasket; 8. Rubber gasket; 9. Second threaded tube; 10. Flexible inner liner; 1001. Sealing part; 1002. Fastening part; 11. Extrusion part; 1101. First push plate; 1102. First long strip plate; 1103. Support column; 1104. Second push plate; 1105. Second long strip plate; 1106. Support plate; 12. Sealing ring; 13. Groove; 14. Receiving groove. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0026] The following is based on Figure 1 - Figure 12 This invention describes a sealed waterproof cable connector provided in an embodiment of the invention.

[0027] Example 1 Please refer to Figure 1 - Figure 8 The present invention provides a technical solution: a sealed waterproof cable connector, including a first threaded sleeve 2 fixed on a housing 1. The housing 1 is a common power distribution cabinet, power distribution box, chassis and other equipment. The first threaded sleeve 2 is fixed at the opening of the housing 1 so that the first threaded sleeve 2 can provide a channel for the cable 6 to pass through and serve as the installation base of the entire connector.

[0028] The sealed waterproof cable connector provided in this embodiment also includes a first threaded tube 3, a flexible inner liner 10, and an extrusion component 11. The flexible inner liner 10 is injection molded, and during injection molding, it partially covers the extrusion component 11. That is, the extrusion component 11 is fixed within the flexible inner liner 10 during injection molding, forming a pre-assembled assembly. During installation, the assembly can be simply placed into the second threaded tube 9, eliminating the need to place circumferentially spaced extrusion components individually at the assembly site. This reduces assembly difficulty and the risk of parts scattering or being missed. The first threaded tube 3 passes through and is threadedly connected to the first threaded sleeve 2. One end of the first threaded tube 3 located on the outside of the housing 1 is fixedly connected to... A second threaded tube 9 is attached. The first threaded tube 3 and the second threaded tube 9 can be fixed together by welding or other methods. To facilitate the operation of the first threaded tube 3, a hexagonal nut seat can be provided at one end of the first threaded tube 3 to allow the first threaded tube 3 to rotate. It should be noted that the maximum outer diameter of the hexagonal nut seat is smaller than the outer diameter of the first threaded tube 3 to allow the first threaded tube 3 to pass through the first threaded sleeve 2. The second threaded tube 9 is provided with a groove 13. The groove 13 gives this section of the second threaded tube 9 a contractile elastic deformation capability, providing a structural basis for subsequent clamping actions. Specifically, when the second threaded sleeve 5 is tightened, a radial contraction force is generated through the threaded inclined surface. This causes the slot to close, thereby pushing the extruder 11 to apply uniform radial pressure to the flexible inner liner 10. The outer side of the second threaded tube 9 is threadedly connected to a second threaded sleeve 5. A flexible boss, made of elastic material, is provided at the inner end of the second threaded sleeve 5 away from the housing 1. During the tightening of the second threaded sleeve 5, the flexible boss applies axial pressure to the end of the extruder 11. The flexible inner liner 10 is located inside the second threaded tube 9 and can be made of elastic materials such as rubber or silicone, possessing good deformation recovery and sealing performance. It consists of a sealing part 1001 and a fastening part 1002. The sealing part 1001, located near the housing 1, mainly bears the load on the cable. 6. Sealing function of the outer wall; The fastening part 1002 is located near the cable 6 inlet end and mainly undertakes the function of clamping and fixing the cable 6. The extrusion members 11 are arranged at equal intervals in the fastening part 1002 in the circumferential direction. They can be made of metal or hard plastic to ensure effective force transmission. The second threaded sleeve 5 acts on the outside of the second threaded tube 9 to tighten the groove 13 so that the fastening part 1002 is squeezed by the extrusion members 11 to clamp the cable 6 in the circumferential direction. The flexible boss inside the second threaded sleeve 5 is squeezed by the extrusion members 11 to make the sealing part 1001 expand radially, so that the flexible inner liner 10 fits tightly with the second threaded tube 9 to achieve reliable sealing and clamping and fixing of the cable 6.

[0029] It should be noted that the sealing part 1001 and the fastening part 1002 in the flexible inner liner 10 are integrally injection molded. During injection molding, part of the extrusion part 11 is covered, so that part of the extrusion part 11 contacts the inner wall of the second threaded tube 9. This facilitates the transmission of pressure generated when the groove 13 on the second threaded tube 9 contracts. In addition, the elastic covering force of the flexible inner liner 10 itself also forms an additional circumferential constraint on the extrusion part 11, forming a dual positioning with the receiving groove 14, which can further prevent the extrusion part from deflecting during tightening. This integral molding The design eliminates the risk of delamination between the sealing part 1001 and the fastening part 1002. When the radial pressure generated by the shrinkage of the groove 13 is transmitted to the fastening part 1002 through the extruder 11, the force can be continuously and losslessly transmitted to the sealing part 1001. The two functional areas respond synchronously, making the linkage between sealing and clamping actions smoother. After injection molding, the extruder 11 forms a continuous transition interface with the flexible inner liner 10, resulting in a more uniform load distribution and extending the service life of the flexible inner liner 10.

[0030] like Figure 1 - Figure 3 As shown, the first threaded tube 3 provided in this embodiment is fitted with a sealing gasket 7 on its outer side, and a locking nut 4 is also threaded onto the first threaded tube 3. The sealing gasket 7 is located between the first threaded sleeve 2 and the locking nut 4. When the locking nut 4 is screwed into the first threaded tube 3, the first anti-slip plate on the side of the locking nut 4 facing the sealing gasket 7 will press the sealing gasket 7, so that a reliable seal is formed between the sealing gasket 7 and the end face of the first threaded sleeve 2. On the one hand, this improves the airtightness of the connection between the housing 1 and the first threaded tube 3, and on the other hand, it improves the stability of the threaded connection between the first threaded sleeve 2, the locking nut 4 and the first threaded tube 3.

[0031] The sealing gasket 7 provided in this embodiment can be made of oil-resistant and aging-resistant materials such as nitrile rubber or fluororubber. Its cross-section can be O-shaped, rectangular or irregular to improve the filling and sealing durability under pressure. The surface of the first anti-slip plate can be provided with teeth or knurling to increase the static friction with the sealing gasket 7 and prevent the locking nut 4 from retracting under vibration.

[0032] like Figure 2 , Figure 3 and Figure 5 As shown, a partition is provided at the connection between the second threaded tube 9 and the first threaded tube 3, and a rubber pad 8 is sleeved on the outside of the second threaded tube 9. A second anti-slip plate is provided at one end of the second threaded sleeve 5 facing the housing 1. This anti-slip plate is used to squeeze the rubber pad 8 when the second threaded sleeve 5 is tightened, so that the rubber pad 8 is axially compressed between the partition and the second anti-slip plate, thereby possessing elastic potential energy. This elastic potential energy is used to push the second threaded sleeve 5, thereby further improving the threaded connection strength between the second threaded sleeve 5 and the second threaded tube 9, so as to prevent the threaded connection from loosening.

[0033] Among them, the rubber pad 8 can be made of silicone or EPDM rubber with excellent elasticity. Its thickness and hardness can be adjusted according to the required pre-tightening force. The second anti-slip plate can be integrally formed or welded to the second threaded sleeve 5. Its pressing surface can be designed as an arc or a cone to adapt to the deformation of the rubber pad 8 and form a continuous and stable axial pressing force.

[0034] like Figure 2 , Figure 3 and Figure 5 As shown, the partition provided in this embodiment has anti-slip textures on both sides. The anti-slip textures can be mesh, stripes or dotted protrusions. By increasing the roughness of the contact surface, the anti-slip ability is improved, thereby increasing the friction with adjacent parts. The two sides of the partition are in contact and pressed against the locking nut 4 and the rubber pad 8 respectively, thereby improving the threaded connection effect of the locking nut 4 and the second threaded sleeve 5 and minimizing loosening.

[0035] like Figure 2 , Figure 3 and Figure 6 As shown, in order to improve the sealing effect of the sealing part 1001, the inner diameter of the second threaded tube 9 located at the sealing part 1001 is larger than its inner diameter located at the fastening part 1002, so that the inner wall of the second threaded tube 9 forms a stepped structure. It should be noted that the sealing part 1001 expands radially after being compressed, thereby filling the large-diameter area inside the entire second threaded tube 9. On the one hand, this is beneficial for positioning the flexible inner liner 10 in the axial direction and preventing it from moving towards the housing 1. On the other hand, it extends the sealing path and improves the sealing effect, thereby improving the waterproof effect.

[0036] like Figure 3 , Figure 6 and Figure 7 As shown, in order to improve the cable clamping effect and prevent axial movement, the length of the slot 13 provided in this embodiment is 2 / 3 of the length of the second threaded tube 9, and the slot 13 is located on the outside of the stepped structure. That is, the slot 13 is mainly distributed in the corresponding position area of ​​the fastening part 1002 to prevent the slot 13 from affecting the sealing effect. In this embodiment, the setting of the slot 13 enables this section of the second threaded tube 9 to have a shrinkable elastic deformation capability, providing a structural basis for the clamping action.

[0037] like Figure 1 - Figure 4 As shown, in order to facilitate the rotation of the second threaded sleeve 5 during tool operation, a hexagonal nut seat is provided on the outside of the second threaded sleeve 5 in this embodiment, which is convenient to tighten with tools such as wrenches. In order to further improve the waterproof effect after the cable 6 is connected, a sealing ring 12 is installed at the contact part between the second threaded sleeve 5 and the cable 6 provided in this embodiment to prevent liquid from seeping in along the gap between the cable 6 and the inlet of the second threaded sleeve 5.

[0038] like Figure 6 and Figure 7 As shown, in order to prevent the flexible inner liner 10 and the extrusion member 11 from circumferentially deflecting during the tightening process, the inner wall of the second threaded tube 9 provided in this embodiment is provided with a receiving groove 14 adapted to the extrusion member 11. The receiving groove 14 is located between two adjacent slots 13 and is used to circumferentially position the extrusion member 11 to prevent the extrusion member 11 from circumferentially deflecting during the tightening process.

[0039] like Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, in this embodiment, the extrusion member 11 includes a first elongated plate 1102 disposed inside the fastening part 1002 and arranged along its axial direction. The cross-section of the first elongated plate 1102 is horseshoe-shaped. This cross-sectional shape allows the first elongated plate 1102 to effectively push the inner wall of the fastening part 1002 and apply a uniform clamping force to the cable 6. Furthermore, the first elongated plate 1102 is provided with equally spaced supports 1103 adapted to the receiving groove 14 to achieve circumferential fixation between the extrusion member 11 and the inner wall of the second threaded tube 9. It should be noted that one end of the support 1103 embedded in the receiving groove 14 is a spherical structure, one end of the first elongated plate 1102 extends into the sealing part 1001 and is provided with a first push plate 1101, and the other end of the first elongated plate 1102 penetrates through... The fastening part 1002 abuts against the flexible boss, so that the axial force of the flexible boss can be effectively transmitted to the extrusion part 11, and then converted into a radial clamping force on the flexible inner liner 10. It should be noted that the first push plate 1101 provided in this embodiment supports the sealing part 1001, which improves the overall structural stability of the sealing part 1001 on the one hand, and facilitates the mechanical extrusion of the sealing part 1001 on the other hand, so that the sealing part 1001 expands radially. When the second threaded sleeve 5 is tightened, the flexible boss pushes the first long strip plate 1102 to move axially, thereby driving the first push plate 1101 to press the sealing part 1001, so that the sealing part 1001 is tightly attached to the outer wall of the cable 6 and the inner wall of the second threaded tube 9, thereby achieving a waterproof effect.

[0040] During operation, tighten the locking nut 4 to the partition plate and install the first threaded tube 3 into the first threaded sleeve 2, so that the sealing gasket 7 is compressed. At this time, the cable 6 is passed through the second threaded sleeve 5, the sealing ring 12, and the flexible inner liner 10, and then enters the housing 1 through the first threaded tube 3 to complete the wiring. Then, the second threaded sleeve 5 is screwed in along the second threaded tube 9. The inner wall of the second threaded sleeve 5 presses the second threaded tube 9 to tighten the groove 13. At the same time, the flexible boss in the second threaded sleeve 5 pushes the extrusion member 11 towards the housing 1, so that the extrusion member 11 applies axial pressure to the sealing part 1001 and radial clamping force to the fastening part 1002, thereby achieving the sealing and fixing of the cable 6.

[0041] At the same time, the second anti-slip plate on the second threaded sleeve 5 is in close contact with the rubber pad 8, which gives the rubber pad 8 a certain elastic potential energy, thereby improving the stability of the second threaded sleeve 5 after installation.

[0042] Example 2 Please refer to Figure 9 - Figure 12 This invention provides a technical solution: a sealed waterproof cable connector, which differs from Embodiment 1 in that: In this embodiment, the extrusion member 11 includes a second elongated plate 1105 disposed inside the fastening part 1002 and arranged along its axial direction. The cross-section of the second elongated plate 1105 is an inverted "V" shape. This cross-sectional shape can generate a component force that expands to both sides when subjected to radial pressure, thereby forming a more concentrated clamping effect on the cable 6. It is suitable for occasions where the clamping force requirement is high. Furthermore, a support plate 1106 adapted to the receiving groove 14 is fixed on the second elongated plate 1105. The support plate 1106 is embedded in the receiving groove 14 and cooperates with the receiving groove 14. To achieve circumferential positioning of the extruded part 11, compared with the support column 1103 in Embodiment 1, the support plate 1106 has a larger contact area, more stable positioning, and more uniform force distribution. It should be noted that the side of the support plate 1106 that cooperates with the receiving groove 14 is provided with a chamfer. One end of the second long strip plate 1105 extends into the sealing part 1001 and is provided with a second push plate 1104 to press the sealing part 1001 when the extruded part 11 moves axially. The other end of the second long strip plate 1105 passes through the fastening part 1002 and abuts against the flexible boss.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sealed waterproof cable connector, comprising a first threaded sleeve (2) fixed to a housing (1), characterized in that, Also includes: The first threaded tube (3) passes through the first threaded sleeve (2) and is threadedly connected to the first threaded sleeve (2). The second threaded tube (9) is fixedly connected to one end of the tube located outside the housing (1). The second threaded tube (9) has a slot (13) and the second threaded sleeve (5) is threadedly connected to the outside of the second threaded tube (9). The second threaded sleeve (5) has a flexible boss on one end of the inner side of the second threaded sleeve (5) away from the housing (1). The flexible inner liner (10) is located inside the second threaded tube (9) and consists of two parts: a sealing part (1001) and a fastening part (1002). The extrusion (11) is arranged at equal intervals along the circumference in the fastening part (1002), and the flexible inner liner (10) is injection molded, covering part of the extrusion (11) during injection molding. The second threaded sleeve (5) acts on the outside of the second threaded tube (9) to tighten the groove (13) so that the fastening part (1002) is squeezed by the extruder (11), and the flexible boss inside the second threaded sleeve (5) squeezes the sealing part (1001) by the extruder (11), so that the flexible inner liner (10) is tightly fitted with the second threaded tube (9).

2. The sealed waterproof cable joint according to claim 1, characterized in that, Also includes: A sealing gasket (7) is fitted onto the outside of the first threaded tube (3); Locking nut (4) is threaded onto the first threaded tube (3); The sealing gasket (7) is located between the first threaded sleeve (2) and the locking nut (4), and the locking nut (4) has a first anti-slip plate on the side facing the sealing gasket (7).

3. The sealed waterproof cable joint according to claim 2, characterized in that, A partition is provided at the connection between the second threaded tube (9) and the first threaded tube (3), and a rubber pad (8) is provided on the outside of the second threaded tube (9). The second threaded sleeve (5) is provided with a second anti-slip plate for squeezing the rubber pad (8) at one end facing the housing (1).

4. The sealed waterproof cable joint according to claim 3, characterized in that, The partition has anti-slip textures on both sides, and the two sides of the partition are in contact with the locking nut (4) and the rubber pad (8) respectively.

5. The sealed waterproof cable joint according to claim 4, characterized in that, The inner diameter of the second threaded tube (9) at the sealing part (1001) is larger than its inner diameter at the fastening part (1002) so that the inner wall of the second threaded tube (9) forms a stepped structure.

6. The sealed waterproof cable joint according to claim 5, characterized in that, The length of the slot (13) is 2 / 3 of the length of the second threaded pipe (9), and the slot (13) is located on the outside of the stepped structure.

7. The sealed waterproof cable joint according to claim 6, characterized in that, The second threaded sleeve (5) is provided with a hexagonal nut seat on the outside, and a sealing ring (12) is installed at the contact part between the second threaded sleeve (5) and the cable (6).

8. The sealed waterproof cable joint according to any one of claims 1-7, characterized in that, The inner wall of the second threaded tube (9) is provided with a receiving groove (14) adapted to the extrusion (11), and the receiving groove (14) is located between two adjacent slots (13).

9. The sealed waterproof cable joint according to claim 8, characterized in that, The extrusion member (11) includes a first long strip (1102) disposed inside the fastening part (1002) and arranged along its axial direction. The first long strip (1102) has a horseshoe-shaped cross section and is provided with support columns (1103) at equal intervals on the first long strip (1102) that are adapted to the receiving groove (14). One end of the first long strip (1102) extends into the sealing part (1001) and is provided with a first push plate (1101). The other end of the first long strip (1102) passes through the fastening part (1002) and abuts against the flexible boss.

10. The sealed waterproof cable joint according to claim 8, characterized in that, The extrusion member (11) includes a second long strip (1105) disposed inside the fastening part (1002) and arranged along its axial direction. The cross-section of the second long strip (1105) is an inverted "V" shape, and a support plate (1106) adapted to the receiving groove (14) is fixed on the second long strip (1105). One end of the second long strip (1105) extends into the sealing part (1001) and is provided with a second push plate (1104), and the other end of the second long strip (1105) passes through the fastening part (1002) and abuts against the flexible boss.

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