Watertight plug

Abstract

The utility model discloses a watertight plug. According to the embodiment of the invention, the supporting cylinder is arranged in the watertight plug, the supporting cylinder is arranged in the cylindrical shell and sleeves the cable, and the cable is fixed in the supporting cylinder, so that the watertight plug can adapt to a high-water-pressure environment, the cylindrical shell is prevented from being pressed to deform due to overlarge stress, the supporting cylinder can bear a high-strength load, and the watertight plug is convenient to use. The whole connector can bear open surface pressure, and is suitable for a full-sea-depth working environment with a harsh environment. Wherein the supporting cylinder comprises a first sub-cylinder body and a second sub-cylinder body, so that the supporting cylinder can be conveniently put into the cylindrical shell from one side of the cable connecting part and is arranged around the cable; the connection position of the cable fixing end of the first pin fixed on the plug connection assembly and the cable is located in the space defined by the first sub-cylinder and the second sub-cylinder, the supporting cylinder supports the connection position of the cable and the first pin more stably, and the sealing effect is improved.

Description

Technical Field

[0001] This application relates to the field of electrical connector technology, specifically to a watertight plug. Background Technology

[0002] Current watertight connectors have low pressure resistance, which, in addition to sealing issues, also stems from weak structural strength, failing to meet the high-pressure application requirements of full-ocean-depth circulation applications with peak pressures of 126.5 MPa. To improve the pressure resistance of watertight connectors and prevent the cable-pin connection from loosening due to vibration, a support cylinder is installed inside the connector housing to support the cable-pin connection. However, the existing support cylinder is a single cylindrical structure, which is inconvenient to assemble, and its curved walls hinder adhesive flow, resulting in uneven adhesive distribution within the cylinder. This leads to insufficient stability in the support cylinder's support of the cable-pin connection and poor sealing. Utility Model Content

[0003] This application provides a watertight plug that solves the technical problems of current watertight plugs where the internal support cylinder is an integral cylindrical structure, which is inconvenient to assemble, the support cylinder provides insufficient stability for the cable and pin connection, and the sealing performance is poor.

[0004] This application provides a watertight plug, the watertight plug comprising:

[0005] A cylindrical housing, including a plug-in portion and a cable connection portion disposed opposite to each other;

[0006] A cable extends from the cable connector into the cylindrical housing;

[0007] A support cylinder is disposed inside the cylindrical outer shell and sleeved on the outside of the cable;

[0008] A plug-in connection assembly is installed inside the plug-in portion;

[0009] A first pin is fixed to the plug-in connection assembly along the axial direction of the cylindrical housing. The first pin includes a cable fixing end, which is disposed facing the cable connection portion and is fixedly connected to the cable.

[0010] The support cylinder includes a first sub-cylinder and a second sub-cylinder, which are connected to each other. The connection point between the cable fixing end and the cable is located within the space enclosed by the first sub-cylinder and the second sub-cylinder.

[0011] Furthermore, the first sub-cylinder and the second sub-cylinder are the same size; and / or, the first sub-cylinder and the second sub-cylinder are both arc-shaped cylinders, and the first sub-cylinder and the second sub-cylinder are connected to form an annular cylinder.

[0012] Furthermore, the first sub-cylinder and the second sub-cylinder are interlocked, riveted, or welded together.

[0013] Furthermore, the watertight plug also includes a potting base, which is disposed within the cable connection portion and surrounds the cable; the support cylinder is located between the potting base and the plug-in connection assembly, and anti-rotation bosses are provided at both axial ends of the support cylinder. One end of the support cylinder is engaged with the plug-in connection assembly through the anti-rotation boss, and the other end of the support cylinder is engaged with the potting base through the anti-rotation boss.

[0014] Furthermore, the support cylinder is provided with at least one of a hollow hole and a strip groove. Adhesive is poured into the cylindrical shell from the cable connection part. The adhesive fills the gap between the outer wall of the support cylinder and the inner wall of the cylindrical shell, and passes through the hollow hole / strip groove to fill the gap between the inner wall of the support cylinder and the outer wall of the cable.

[0015] Furthermore, at least one end of the support cylinder is provided with a plurality of strip-shaped slots, and the distance between any two adjacent strip-shaped slots is equal.

[0016] Furthermore, the watertight plug also includes a vulcanized rubber sleeve, which is connected to the outside of the cable connection portion and is sealed to the cable. The outer surface of the cable connection portion is provided with multiple circumferential grooves, and the inner side of the vulcanized rubber sleeve is provided with multiple anti-slip rings, which are arranged one-to-one with the circumferential grooves.

[0017] Furthermore, the watertight plug also includes a locking nut and a thrust washer. The outer side of the plug portion is provided with an annular step. The locking nut is sleeved on the outer side of the plug portion. The locking nut has a threaded portion and a limiting portion. The inner diameter of the limiting portion is smaller than the inner diameter of the threaded portion. The limiting portion is engaged with the annular step. The thrust washer is provided between the limiting portion and the annular step. The outer side of the plug portion is also provided with a limiting ring. The limiting ring is located on the side of the limiting portion away from the annular step. The locking nut moves between the limiting ring and the annular step. The inner side of the threaded portion is provided with an internal thread. An installation chamber is formed between the threaded portion and the plug portion. The annular step serves as the bottom surface of the installation chamber.

[0018] Furthermore, the watertight plug also includes a watertight plug; the watertight plug includes a plug housing, a third end face sealing ring, and a third inner sealing ring. The plug housing is provided with a sealing connection end, and the outer side of the sealing connection end is provided with a third external thread. The third end face sealing ring is located on the outer end face of the sealing connection end, and the third inner sealing ring is located on the inner side of the plug housing. When the sealing connection end is inserted into the installation compartment, the third external thread is threadedly connected to the internal thread, and the insertion part seals against the third end face sealing ring and the third inner sealing ring.

[0019] The watertight connector provided in this application embodiment features a support cylinder housed within the cylindrical outer shell and fitted over the cable. The cable is secured within the support cylinder, enhancing its adaptability to high water pressure environments and preventing excessive stress and deformation of the cylindrical outer shell. The support cylinder can withstand high-intensity loads, achieving a tensile sealing function for the cable. The connector as a whole can withstand open-face pressure, making it suitable for harsh, full-ocean-depth working environments. The support cylinder comprises a first sub-cylinder and a second sub-cylinder, facilitating its insertion into the cylindrical outer shell from the cable connection side and its placement around the cable. The connection point between the cable-fixing end of the first pin fixed on the plug-in connector and the cable is located within the space enclosed by the first and second sub-cylinders. The support cylinder provides more stable support for the cable and the first pin connection, improving the sealing effect. Attached Figure Description

[0020] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the watertight plug provided in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the watertight plug provided in an embodiment of this application;

[0023] Figure 3 A partial structural schematic diagram of the watertight plug provided in an embodiment of this application;

[0024] Figure 4 A schematic cross-sectional view of a watertight plug provided in an embodiment of this application;

[0025] Figure 5 Provided for the embodiments of this application Figure 4 A magnified view of part I in the middle;

[0026] Figure 6 This is a schematic diagram of the structure of the potting base provided in the embodiments of this application;

[0027] Figure 7 This is a schematic cross-sectional view of the potting base provided in the embodiments of this application;

[0028] Figure 8 This is a schematic diagram of the structure of the support cylinder provided in an embodiment of this application;

[0029] Figure 9 This is an exploded structural diagram of the support cylinder provided in an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of the structure of the floating socket base provided in the embodiments of this application;

[0031] Figure 11 A schematic cross-sectional view of the plug-in connection assembly provided in the embodiments of this application;

[0032] Figure 12 Provided for the embodiments of this application Figure 11 A magnified view of a section II;

[0033] Figure 13 A schematic diagram of the structure of the watertight plug provided in the embodiment of this application with a watertight plug;

[0034] Figure 14 This is a schematic diagram of the cross-sectional structure of the watertight plug provided in an embodiment of this application.

[0035] The markings in the diagram are as follows:

[0036] 10. Watertight plug, 1. Cylindrical housing, 11. Plug-in part, 111. Annular step, 112. Limiting protrusion, 113. Sealing groove, 12. Cable connection part, 121. Circumferential groove, 14. Anti-detachment structure, 141. Buffer rubber pad, 142. Compression ring, 143. Limiting retaining ring, 15. Locking screw sleeve, 2. Threaded part, 211. Internal thread, 22. Limiting part, 3. Thrust washer, 4. Plug-in connection assembly, 41. Floating socket base, 411. Insert through hole, 412. Slot, 413. Double-ended socket assembly. 42, 421, 43, 44, 44, 5, 6, 6, 61, 62, 63, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 20 ... Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this application embodiment provides a watertight plug 10, which includes a cylindrical outer shell 1, a cable 5, a support cylinder 8, a plug-in connection assembly 4, and a first pin 44.

[0041] like Figure 2 , Figure 3 , Figure 8 , Figure 9As shown, the cylindrical outer shell 1 includes a plug-in portion 11 and a cable connection portion 12 disposed opposite to each other; the cable 5 extends into the cylindrical outer shell 1 from the cable connection portion 12; the support cylinder 8 is disposed inside the cylindrical outer shell 1 and sleeved on the outside of the cable 5; the plug-in connection assembly 4 is installed inside the plug-in portion 11; the first pin 44 is fixed on the plug-in connection assembly 4 along the axial direction of the cylindrical outer shell 1, the first pin 44 includes a cable fixing end 441, the cable fixing end 441 is disposed facing the cable connection portion 12, and the cable fixing end 441 is fixedly connected to the cable 5; the support cylinder 8 includes a first sub-cylinder 81 and a second sub-cylinder 82, the first sub-cylinder 81 and the second sub-cylinder 82 are connected to each other, and the connection point of the cable fixing end 441 and the cable 5 is located within the space enclosed by the first sub-cylinder 81 and the second sub-cylinder 82.

[0042] The support cylinder 8 can withstand high-intensity loads, achieving a tensile sealing function for the cable 5. The connector as a whole can withstand open-face pressure, making it suitable for harsh working environments at full ocean depth. The support cylinder 8 includes a first sub-cylinder 81 and a second sub-cylinder 82, facilitating its insertion into the cylindrical outer shell 1 from one side of the cable connection portion 12 and its surrounding arrangement around the cable 5. The support cylinder 8 provides more stable support at the connection point between the cable 5 and the first pin 44, improving the sealing effect.

[0043] like Figure 8 , Figure 9 As shown, the first sub-cylinder 81 and the second sub-cylinder 82 are the same size; and / or, the first sub-cylinder 81 and the second sub-cylinder 82 are both arc-shaped cylinders, and the first sub-cylinder 81 and the second sub-cylinder 82 are connected to form an annular cylinder. Preferably, the first sub-cylinder 81 and the second sub-cylinder 82 have the same radius, which facilitates the assembly of the first sub-cylinder 81 and the second sub-cylinder 82 into an annular cylinder-shaped support cylinder 8.

[0044] The first sub-cylinder 81 and the second sub-cylinder 82 are fastened, riveted, or welded together.

[0045] like Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, the watertight plug 10 also includes a potting base 6, which is disposed within the cable connection portion 12 and surrounds the cable 5. A support cylinder 8 is located between the potting base 6 and the plug-in connection assembly 4. The support cylinder 8 has anti-rotation protrusions 83 at both axial ends. One end of the support cylinder 8 is engaged with the plug-in connection assembly 4 via the anti-rotation protrusions 83, and the other end of the support cylinder 8 is engaged with the potting base 6 via the anti-rotation protrusions 83. The anti-rotation protrusions 83 serve an anti-rotation positioning function.

[0046] like Figure 2 , Figure 4 As shown, the watertight plug 10 also includes a locking sleeve 7, which surrounds the cable 5 and is threadedly connected to the cable connection portion 12. The locking sleeve 7 provides axial restraint to the potting base 6.

[0047] like Figure 6 , Figure 7 As shown, along the axial direction of the glue potting seat 6, the glue potting seat 6 has a first inner wall 63, a second inner wall 64, and a third inner wall 65. The inner diameter of the first inner wall 63 gradually decreases, while the inner diameter of the second inner wall 64 remains constant. The inner diameter of the second inner wall 64 is greater than the minimum inner diameter of the first inner wall 63 and less than the maximum inner diameter of the first inner wall 63. The inner diameter of the third inner wall 65 first gradually decreases, then remains constant, and finally gradually increases. The maximum inner diameter of the third inner wall 65 is less than the inner diameter of the second inner wall 64.

[0048] like Figure 8 , Figure 9 As shown, the support cylinder 8 has at least one of a perforated hole 84 and a strip groove 85. Adhesive is poured from the cable connection portion 12 into the cylindrical outer shell 1. The adhesive fills the gap between the outer wall of the support cylinder 8 and the inner wall of the cylindrical outer shell 1, and passes through the perforated hole 84 / strip groove 85 to fill the gap between the inner wall of the support cylinder 8 and the outer wall of the cable 5. After the adhesive fills the gap, it solidifies to form a potting body, making the potting body inside and outside the potting seat 6 a single unit. The outer wall of the potting body forms a frustum 51 that matches the shape of the first inner wall 63, the second inner wall 64, and the third inner wall 65, thereby enhancing the installation stability of the cable 5. The perforated hole 84 and the strip groove 85 reduce the weight of the parts and facilitate the flow and molding of the adhesive, filling the cavity and increasing the clamping force when the adhesive is piled up to form the potting body. This transmits the pressure to the support cylinder 8, preventing the plug-in connection component 4 from directly bearing pressure.

[0049] like Figure 8 , Figure 9As shown, at least one end of the support cylinder 8 is provided with a plurality of strip-shaped slots 85, and the distance between any two adjacent strip-shaped slots 85 is equal. The strip-shaped slots 85 can increase the bonding force with the potting compound and improve the bonding strength.

[0050] like Figure 2 , Figure 5 , Figure 6 As shown, the glue-filling base 6 has a glue channel 62 on its outer side. The glue channel 62 facilitates glue flow and venting, avoiding the defects of insufficient glue flow and poor stability after installation caused by insufficient glue volume on the outside of the glue-filling base 6. The glue-filling base 6 has glue inside and outside, and after the glue solidifies, the inner and outer glue bodies are integrated, forming a stable structure. The glue-filling gap is located on both sides of the glue-filling base 6. The glue-filling gap includes the gap between the inner side of the glue-filling base 6 and the frustum portion 51. After the glue fills the glue-filling gap, it solidifies to form a glue body, making the glue body inside and outside the glue-filling base 6 a single unit, thereby enhancing the installation stability of the cable 5.

[0051] The support cylinder 8 provides support, and the potting compound completely fills the space between the support cylinder 8 and the cylindrical outer shell 1, increasing its adaptability to high water pressure environments and preventing the cylindrical outer shell 1 from being deformed due to excessive force. The perforated holes 84 increase the connection between the potting compound and the support cylinder 8. The perforated holes 84 include a central circumferential hole and rectangular openings at both ends, reducing the weight of the part and facilitating the flow of adhesive into the molding cavity. This fills the cavity and increases the clamping force when the potting compound is formed, transferring pressure to the support cylinder 8 and preventing the plug-in connection component 4 from directly bearing pressure. It is understood that the potting compound is an integral structure, forming a stable structure. The potting compound completely fills the interior of the cable connection part 12, increasing its adaptability to high water pressure environments and preventing the cylindrical outer shell 1 from being deformed due to excessive force.

[0052] like Figure 1 , Figure 2 As shown, the watertight plug 10 also includes a vulcanized rubber sleeve 9, which is connected to the outside of the cable connection portion 12 and is sealed to the cable 5. The outer surface of the cable connection portion 12 has multiple circumferential grooves 121, and the inner surface of the vulcanized rubber sleeve 9 has multiple anti-slip rings 91, which are arranged in a one-to-one correspondence with the circumferential grooves 121. The vulcanized rubber sleeve 9 can seal the cable connection portion 12, providing a waterproof and dustproof effect.

[0053] like Figure 1 , Figure 2 , Figure 3As shown, the watertight plug 10 also includes a locking screw sleeve 2 and a thrust washer 3. An annular step 111 is provided on the outer side of the insertion portion 11. The locking screw sleeve 2 is sleeved on the outer side of the insertion portion 11. The locking screw sleeve 2 has a threaded portion 21 and a limiting portion 22. The inner diameter of the limiting portion 22 is smaller than the inner diameter of the threaded portion 21. The limiting portion 22 is engaged with the annular step 111. The thrust washer 3 is disposed between the limiting portion 22 and the annular step 111. A limiting ring 15 is also provided on the outer side of the connecting part 11. The limiting ring 15 is located on the side of the limiting part 22 opposite to the annular step 111. The limiting ring 15 is used to limit the range of motion of the locking sleeve 2. The locking sleeve 2 moves between the limiting ring 15 and the annular step 111. The inner side of the threaded part 21 is provided with an internal thread 211. An installation chamber is formed between the threaded part 21 and the insertion part 11. The annular step 111 serves as the bottom surface of the installation chamber. The thrust washer 3 serves two purposes: sealing and buffering the friction between the locking sleeve 2 and the annular step 111. It also prevents the rotation of the locking sleeve 2 from causing wear on the annular step 111, thus protecting the locking sleeve 2. The thrust washer 3 is made of engineering plastic, which can compensate for machining and assembly tolerances, provide locking and sealing, has a simple structure, is easy to operate, and reduces vibration and impact.

[0054] like Figure 2 , Figure 3 , Figure 10 , Figure 11 , Figure 12As shown, the plug-in connection assembly 4 includes a floating socket base 41, a double-ended socket assembly 42, a first fixed pin base 43, and a first pin 44. The floating socket base 41 has multiple insertion through holes 411. The double-ended socket assembly 42 is disposed within the insertion through holes 411. A limiting protrusion ring 112 is provided on the inner side of the middle part of the plug-in portion 11. An anti-disengagement structure 14 is provided at the end of the plug-in portion 11. The floating socket base 41 is disposed within the plug-in portion 11 and abuts against the limiting protrusion ring 112. The anti-disengagement structure 14 limits the floating socket base 41 to the plug-in portion 11. Inside part 11, the first fixed pin base 43 is provided with a plurality of first pins 44. The first pins 44 are arranged one-to-one with the plug-in through holes 411. The two ends of the first fixed pin base 43 abut against the support cylinder 8 and the limiting protrusion ring 112 respectively. The first pins 44 protrude from the first fixed pin base 43. The first pins 44 are inserted into the plug-in through holes 411 and electrically connected to the double-ended plug assembly 42. The end of the first pin 44 away from the double-ended plug assembly 42 is electrically connected to the wire harness in the cable 5. The anti-dislodgement structure 14 includes a buffer rubber pad 141, a clamping ring 142 and a limiting ring 143. The outer end of the floating plug base 41 is provided with a slot 412. The buffer rubber pad 141, the clamping ring 142 and the limiting ring 143 are arranged sequentially in the slot 412. The limiting ring 143 is connected to the inner side of the end of the plug-in part 11. The anti-disengagement structure 14 can limit the floating socket base 41 within the plug-in portion 11 and can also buffer stress when plugging and unplugging the watertight socket 30. The buffer rubber pad 141 can also reduce the impact of vibration environment on electrical signal transmission and avoid the risk of intermittent signal transmission of contact components due to seawater oscillation impact.

[0055] like Figure 11 , Figure 12 As shown, the dual-ended socket assembly 42 has a protrusion 421 in the middle, and the floating socket base 41 has a groove 413 corresponding to the protrusion 421. The length of the groove 413 along the extension direction of the first pin 44 is greater than the length of the protrusion 421. Preferably, the protrusion 421 is barbed. The protrusion 421 is limited to move within the groove 413, thereby reducing the insertion stress between the first pin 44 and the dual-ended socket assembly 42. The protrusion 421 can float and shift within the groove 413, which is suitable for deformation caused by transferring from a normal pressure environment to a deep-sea high-pressure environment, reducing changes in connection stress.

[0056] like Figure 13 , Figure 14As shown, the watertight plug 10 also includes a watertight plug 20; the watertight plug 20 includes a plug housing 201, a third end face sealing ring 202, and a third inner sealing ring 203. The plug housing 201 is provided with a sealing connection end 204. The outer side of the sealing connection end 204 is provided with a third external thread 205. The third end face sealing ring 202 is provided on the outer end face of the sealing connection end 204. The third inner sealing ring 203 is provided on the inner side of the plug housing 201. When the sealing connection end 204 is inserted into the installation compartment, the third external thread 205 is threadedly connected to the inner thread 211. The insertion part 11 is sealed and abuts against the third end face sealing ring 202 and the third inner sealing ring 203. In use, the watertight plug 20 seals the insertion portion 11 of the watertight plug 10, and the thrust washer 3, the third end face sealing ring 202, and the third inner sealing ring 203 form a sealing structure, achieving a waterproof and dustproof effect. When connecting the watertight plug 10 and the watertight socket 30, the watertight plug 20 is removed from the watertight plug 10, and then the watertight socket 30 is connected to the watertight plug 10.

[0057] The watertight connector provided in this application embodiment features a support cylinder housed within the cylindrical outer shell and fitted over the cable. The cable is secured within the support cylinder, enhancing its adaptability to high water pressure environments and preventing excessive stress and deformation of the cylindrical outer shell. The support cylinder can withstand high-intensity loads, achieving a tensile sealing function for the cable. The connector as a whole can withstand open-face pressure, making it suitable for harsh, full-ocean-depth working environments. The support cylinder comprises a first sub-cylinder and a second sub-cylinder, facilitating its insertion into the cylindrical outer shell from the cable connection side and its placement around the cable. The connection point between the cable-fixing end of the first pin fixed on the plug-in connector and the cable is located within the space enclosed by the first and second sub-cylinders. The support cylinder provides more stable support for the cable and the first pin connection, improving the sealing effect.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0059] The above provides a detailed description of a watertight plug provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A watertight plug, characterized in that The application relates to a watertight plug (10) comprising: a cylindrical shell (1) comprising oppositely arranged plug-in parts (11) and cable connecting parts (12); a cable (5) extending into the cylindrical shell (1) from the cable connecting parts (12); a supporting cylinder (8) arranged in the cylindrical shell (1) and sleeved on the outside of the cable (5); a plug-in connecting assembly (4) mounted in the plug-in parts (11); a first plug pin (44) fixed on the plug-in connecting assembly (4) along the axial direction of the cylindrical shell (1), wherein the first plug pin (44) comprises a cable fixing end (441) arranged towards the cable connecting parts (12) and fixedly connected with the cable (5); the supporting cylinder (8) comprises a first sub-cylinder (81) and a second sub-cylinder (82), the first sub-cylinder (81) and the second sub-cylinder (82) are connected with each other, and the connecting position of the cable fixing end (441) and the cable (5) is located in the space surrounded by the first sub-cylinder (81) and the second sub-cylinder (82).

2. The watertight plug of claim 1, wherein, the first sub-cylinder (81) and the second sub-cylinder (82) are of the same size; and / or the first sub-cylinder (81) and the second sub-cylinder (82) are both arc-shaped cylinders, and the first sub-cylinder (81) and the second sub-cylinder (82) form an annular cylinder after being connected.

3. The watertight plug of claim 1, wherein, the first sub-cylinder (81) and the second sub-cylinder (82) are connected with each other through buckling, riveting or welding.

4. The watertight plug of claim 1, wherein, the watertight plug (10) further comprises a glue filling seat (6) arranged in the cable connecting parts (12), wherein the glue filling seat (6) surrounds the cable (5); the supporting cylinder (8) is located between the glue filling seat (6) and the plug-in connecting assembly (4), the axial ends of the supporting cylinder (8) are provided with anti-rotation bosses (83), one end of the supporting cylinder (8) is clamped with the plug-in connecting assembly (4) through the anti-rotation boss (83), and the other end of the supporting cylinder (8) is clamped with the glue filling seat (6) through the anti-rotation boss (83).

5. The watertight plug of claim 1, wherein, at least one of a hollow hole (84) and a strip-shaped slot (85) is arranged on the supporting cylinder (8), glue is poured into the cylindrical shell (1) from the cable connecting parts (12), the glue fills the gap between the outer wall of the supporting cylinder (8) and the inner wall of the cylindrical shell (1), and passes through the hollow hole (84) / strip-shaped slot (85) to fill the gap between the inner wall of the supporting cylinder (8) and the outer wall of the cable (5).

6. The watertight plug of claim 5, wherein, at least one end of the supporting cylinder (8) is provided with a plurality of strip-shaped slots (85), and the distance between every two adjacent strip-shaped slots (85) is equal.

7. The watertight plug of claim 1, wherein, The watertight plug (10) further comprises a vulcanized rubber sleeve (9) connected outside the cable connecting part (12), the cable connecting part (12) is provided with a plurality of circumferential grooves (121) on the outer surface, and the inner side of the vulcanized rubber sleeve (9) is provided with a plurality of anti-skid rings (91) corresponding to the circumferential grooves (121).

8. The watertight plug of claim 1, wherein, The watertight plug (10) further comprises a locking nut (2) and a thrust washer (3), the outside of the plug-in part (11) is provided with an annular step (111), the locking nut (2) is sleeved outside the plug-in part (11), the locking nut (2) is provided with a threaded part (21) and a limiting part (22), the inner diameter of the limiting part (22) is smaller than the inner diameter of the threaded part (21), the limiting part (22) is limitedly connected with the annular step (111), the thrust washer (3) is arranged between the limiting part (22) and the annular step (111), the plug-in part (11) is further provided with a limiting snap ring (15), the limiting snap ring (15) is located on the side of the limiting part (22) away from the annular step (111), the locking nut (2) is movable between the limiting snap ring (15) and the annular step (111), the inner side of the threaded part (21) is provided with an internal thread (211), and the threaded part (21) and the plug-in part (11) form an installation cabin, and the annular step (111) serves as a cabin bottom surface of the installation cabin.

9. The watertight plug of claim 8, wherein, The watertight plug (10) further comprises a watertight plug (20); the watertight plug (20) comprises a plug shell (201), a third end face sealing ring (202) and a third inner sealing ring (203), the plug shell (201) is provided with a plugging connecting end (204), the outer side of the plugging connecting end (204) is provided with a third external thread (205), the third end face sealing ring (202) is arranged on the outer end face of the plugging connecting end (204), and the third inner sealing ring (203) is arranged on the inner side of the plug shell (201); when the plugging connecting end (204) is inserted into the installation cabin, the third external thread (205) is threadedly connected with the internal thread (211), and the plug-in part (11) is sealingly abutted with the third end face sealing ring (202) and the third inner sealing ring (203).

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