Watertight plug

Abstract

The utility model discloses a watertight plug. According to the embodiment of the invention, the glue filling body and the glue filling seat are arranged in the cylindrical shell of the watertight plug, the outer wall of the glue filling seat is provided with at least one glue passing groove, and the glue passing groove can avoid the defects that glue liquid outside the glue filling seat flows without a channel, the glue amount is small, and the stability is poor after the glue filling seat is installed. The gaps among the glue passing groove, the outer wall of the glue filling base and the inner wall of the cylindrical shell and the gaps among the inner wall of the glue filling base and the outer surface of the cable are filled with the glue filling bodies, and the glue filling bodies are of an integral structure, so that glue liquid is arranged inside and outside the glue filling base, the glue filling bodies are integrated after the glue liquid is cured, and the glue filling effect is good. A stable structure is formed, the glue passing groove can achieve the purpose that glue liquid is filled in an internal gap of the watertight plug, and therefore the high-pressure resistance is improved, the adaptability to a high-water-pressure environment can be improved, the cylindrical shell is prevented from being pressed to deform due to too large stress, and the sealing effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical connectors, in particular to a watertight plug. BACKGROUND

[0002] Due to the harsh and complex full-sea-depth environment and repeated impact of sea water laminar flow, not only does the underwater electrical connector require stable connection of large current and electrical signals during plug-in butt joint, but also the vulcanization part of the connector cable needs to have a reliable sealing function to prevent seawater from leaking into the product interior and to avoid damage to the electrical contact and the transmission of electrical signals. There is a space gap in the current underwater electrical connector, which causes deformation and damage of the high-pressure extruded underwater electrical connector shell, resulting in leakage, and the sealing performance is poor, which cannot meet the requirements of the full-sea-depth cyclic water pressure application environment with a peak value of 126.5Mpa. Therefore, how to reasonably fill the internal gap of the watertight plug to improve the high-pressure resistance performance has become a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0003] The embodiment of the present application provides a watertight plug, which can solve the technical problem of how to reasonably fill the internal gap of the watertight plug to improve the high-pressure resistance performance.

[0004] The embodiment of the present application provides a watertight plug, which can solve the technical problem of how to reasonably fill the internal gap of the watertight plug to improve the high-pressure resistance performance.

[0005] The cylindrical shell is provided with opposite plug-in parts and cable connection parts, the plug-in part is provided with the plug-in connection assembly on the inner side, the cable extends into the cylindrical shell from the cable connection part and is electrically connected with the plug-in connection assembly, the glue pouring seat is arranged in the cable connection part, the glue pouring seat is arranged outside the cable, at least one glue pouring groove is formed on the outer wall of the glue pouring seat, the glue liquid is poured into the cylindrical shell, the glue liquid fills the gap between the glue pouring groove, the outer wall of the glue pouring seat and the inner wall of the cylindrical shell and the gap between the inner wall of the glue pouring seat and the outer wall of the cable, and the glue liquid solidifies to form the glue pouring body, and the glue pouring body on the outer wall of the glue pouring seat and the glue pouring body on the inner wall of the glue pouring seat form an integral structure.

[0006] Further, the glue pouring groove is arranged in the axial direction of the glue pouring seat.

[0007] Further, the glue pouring groove is arranged in the axial direction of the glue pouring seat.

[0008] Further, one end of at least one glue pouring groove penetrates the wall surface of the glue pouring seat in the radial direction of the glue pouring seat to form an anti-rotation groove; a supporting cylinder is further arranged between the glue pouring seat and the plug-in connection assembly, the supporting cylinder is sleeved on the cable and is clamped with the anti-rotation groove.

[0009] Furthermore, along the axial direction of the glue potting seat, the glue potting seat has a first inner wall, a second inner wall, and a third inner wall. The inner diameter of the first inner wall gradually decreases, the inner diameter of the second inner wall remains unchanged, the inner diameter of the second inner wall is greater than the minimum inner diameter of the first inner wall and less than the maximum inner diameter of the first inner wall, the inner diameter of the third inner wall first gradually decreases, then remains unchanged, and finally gradually increases, the maximum inner diameter of the third inner wall is less than the inner diameter of the second inner wall.

[0010] Furthermore, the watertight plug also includes a locking sleeve, which surrounds the cable and is threadedly connected to the cable connection portion, and the locking sleeve provides axial restraint to the potting seat.

[0011] Furthermore, the plug-in connection assembly includes a floating socket base, a dual-ended socket assembly, a first fixed pin base, and first pins. The floating socket base has multiple insertion through holes. The dual-ended socket assembly is disposed within the insertion through holes. A limiting protrusion ring is provided on the inner side of the middle of the plug-in portion. An anti-disengagement structure is provided at the end of the plug-in portion. The floating socket base is disposed within the plug-in portion and abuts against the limiting protrusion ring. The anti-disengagement structure limits the floating socket base within the plug-in portion. The first fixed pin base has multiple first pins. Each first pin corresponds to one of the insertion through holes. One end of the first fixed pin base facing the floating socket base abuts against the limiting protrusion ring. The first pin protrudes beyond the first fixed pin base. The first pin is inserted into the insertion through hole and electrically connected to the dual-ended socket assembly. The end of the first pin away from the dual-ended socket assembly is electrically connected to the wire harness in the cable.

[0012] Furthermore, the dual-ended socket assembly has a protrusion in the middle, and the first fixed pin base has a groove corresponding to the protrusion. The length of the groove along the extension direction of the first pin is greater than the length of the protrusion.

[0013] Furthermore, the watertight plug also includes an inner sealing O-ring, and the inner side of the plug portion is provided with a sealing groove corresponding to the first fixed pin base. The inner sealing O-ring is disposed in the sealing groove and surrounds the first fixed pin base.

[0014] The watertight plug provided in this application embodiment has a potting body and a potting seat inside the cylindrical shell of the watertight plug. The outer wall of the potting seat has at least one glue channel. The glue channel can avoid the defects of no channel for the flow of glue outside the potting seat, insufficient glue volume, and poor stability after installation. The glue channel, the gap between the outer wall of the potting seat and the inner wall of the cylindrical shell, and the gap between the inner wall of the potting seat and the outer surface of the cable are all filled with the potting body. The potting body is an integral structure, so that there is glue inside and outside the potting seat. After the glue cures, the potting body is a single piece, forming a stable structure. The glue channel can realize the filling of the internal gap of the watertight plug with glue, thereby improving the high pressure resistance, increasing the adaptability to high water pressure environment, preventing the cylindrical shell from being deformed by excessive pressure, and improving the sealing effect. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of the watertight plug provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the watertight plug provided in an embodiment of this application;

[0018] Figure 3 A partial structural schematic diagram of the watertight plug provided in an embodiment of this application;

[0019] Figure 4 A schematic cross-sectional view of a watertight plug provided in an embodiment of this application;

[0020] Figure 5 Provided for the embodiments of this application Figure 4 A magnified view of part I in the middle;

[0021] Figure 6 This is a schematic diagram of the structure of the potting base provided in the embodiments of this application;

[0022] Figure 7 This is a schematic cross-sectional view of the potting base provided in the embodiments of this application;

[0023] Figure 8 This is a schematic diagram of the structure of the support cylinder provided in an embodiment of this application;

[0024] Figure 9 This is an exploded structural diagram of the support cylinder provided in an embodiment of this application;

[0025] Figure 10 This is a schematic diagram of the structure of the floating socket base provided in the embodiments of this application;

[0026] Figure 11 A schematic cross-sectional view of the plug-in connection assembly provided in the embodiments of this application;

[0027] Figure 12 Provided for the embodiments of this application Figure 11 A magnified view of a section II;

[0028] Figure 13 A schematic diagram of the structure of the watertight plug provided in the embodiment of this application with a watertight plug;

[0029] Figure 14 This is a schematic diagram of the cross-sectional structure of the watertight plug provided in an embodiment of this application.

[0030] The markings in the diagram are as follows:

[0031] 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. Inner sealing O-ring, 16. Locking screw sleeve, 21. Threaded part, 211. Internal thread, 22. Limiting part, 3. Thrust washer, 4. Plug-in connection assembly, 41. Floating socket base, 411. Plug-in through hole, 412. Slot, 413. Double-ended socket assembly, 42. , 421, first fixed pin base 43, first pin 44, cable 5, glue potting base 6, anti-rotation groove 61, glue passage groove 62, first inner wall 63, second inner wall 64, third inner wall 65, locking sleeve 7, support cylinder 8, first arc-shaped cylinder 81, second arc-shaped cylinder 82, anti-rotation boss 83, hollow hole 84, strip groove 85, vulcanized rubber sleeve 9, anti-slip ring 91, watertight plug 20, plug shell 201, third end face sealing ring 202, third inner sealing ring 203, sealing connection end 204, third external thread 205. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] like Figure 1 , Figure 2 , Figure 3 As shown, this application embodiment provides a watertight plug 10, which includes a cylindrical outer shell 1, a plug-in connection component 4, a cable 5, a potting body, and a potting base 6.

[0036] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the cylindrical outer shell 1 is provided with a corresponding plug-in portion 11 and a cable connection portion 12. The plug-in connection component 4 is provided inside the plug-in portion 11. The cable 5 extends into the cylindrical outer shell 1 from the cable connection portion 12 and is electrically connected to the plug-in connection component 4. The glue potting seat 6 is provided inside the cable end connection portion 12. The glue potting seat 6 is sleeved on the outside of the cable 5. At least one glue channel 62 is provided on the outer wall of the glue potting seat 6. Glue is injected into the cylindrical outer shell 1, filling the glue channel 62, the gap between the outer wall of the glue potting seat 6 and the inner wall of the cylindrical outer shell 1, and the gap between the inner wall of the glue potting seat 6 and the outer wall of the cable 5, respectively. After the glue solidifies, it forms the glue potting body. The glue potting body on the outer wall of the glue potting seat 6 and the glue potting body on the inner wall of the glue potting seat 6 are an integral structure.

[0037] The glue channel 62 avoids the defects of insufficient glue flow and poor stability of the glue base 6 after installation, which are caused by the lack of channels for glue flow and the small amount of glue. The glue channel 62, the gap between the outer wall of the glue base 6 and the inner wall of the cylindrical shell 1, and the gap between the inner wall of the glue base 6 and the outer surface of the cable 5 are all filled with the glue body. The glue body is an integral structure, so that the glue base 6 is filled with glue both inside and out. After the glue cures, the glue body is a single unit, forming a stable structure. The glue channel 62 can fill the internal gap of the watertight plug 10 with glue, thereby improving the high pressure resistance, increasing adaptability to high water pressure environments, preventing the cylindrical shell from being deformed by excessive force, and improving the sealing effect.

[0038] Furthermore, the potting compound is formed by the curing of an adhesive liquid. The adhesive liquid can fill the internal gaps of the watertight plug 10, thereby improving its high-pressure resistance, increasing its adaptability to high water pressure environments, and enhancing the pressure resistance of the watertight plug 10.

[0039] like Figure 6 As shown, the glue channel 62 extends along the axial direction of the glue dispensing base 6, so that there is glue inside and outside the glue dispensing base 6.

[0040] like Figure 6 As shown, there are at least two glue-passing grooves 62, and the distance between each pair of adjacent glue-passing grooves 62 is equal.

[0041] like Figure 6 As shown, at least one end of the glue channel 62 penetrates the wall of the glue pot 6 radially to form an anti-rotation groove 61; a support cylinder 8 is also provided between the glue pot 6 and the plug-in connection assembly 4, the support cylinder 8 is sleeved on the cable 5 and snapped into the anti-rotation groove 61. The support cylinder 8 can withstand high-strength loads, realize the tensile sealing function of the watertight cable, and the connector as a whole can withstand the opening pressure, making it suitable for harsh full-ocean-depth working environments.

[0042] 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.

[0043] like Figure 6 , Figure 7As shown, along the axial direction of the glue potting base 6, the glue potting base 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. The outer wall of the glue potting body forms a frustum-shaped portion 51 that matches the shape of the first inner wall 63, the second inner wall 64, and the third inner wall 65.

[0044] 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 also 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 compound, making the potting compound inside and outside the potting seat 6 a single unit, thereby enhancing the installation stability of the cable 5. The perforated hole 84 and 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 compound. This transmits the pressure to the support cylinder 8, preventing the plug-in connection component 4 from directly bearing pressure.

[0045] like Figure 8 , Figure 9 As 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.

[0046] The potting compound completely fills the space between the support cylinder 8 and the cylindrical outer shell 1, which can increase its adaptability to high water pressure environment and prevent the cylindrical outer shell 1 from being deformed due to excessive force. The strip groove 85 can increase the connection force between the potting compound and the support cylinder 8.

[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the watertight plug 10 also includes a locking screw sleeve 2 and a thrust washer 3. The locking screw sleeve 2 is sleeved on the outside of the plug-in portion 11. The locking screw sleeve 2 has a screw connection portion 21 and a limiting portion 22. The inner diameter of the limiting portion 22 is smaller than the inner diameter of the screw connection portion 21. The limiting portion 22 is engaged with the annular step 111. The thrust washer 3 is provided between the limiting portion 22 and the annular step 111. A limiting retaining ring 15 is also provided on the outside of the plug-in portion 11. The limiting retaining ring 15 is located on the side of the limiting portion 22 away from the annular step 111. The limiting retaining ring 15 is used to limit the range of motion of the locking screw sleeve 2. The locking screw sleeve 2 moves between the limiting retaining ring 15 and the annular step 111. The screw connection portion 21 has an internal thread 211 on its inner side. An installation chamber is formed between the screw connection portion 21 and the plug-in portion 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 wear on the annular step 111 caused by the rotation of the locking sleeve 2, thus protecting the locking sleeve 2. The thrust washer 3 is made of engineering plastic, which can compensate for machining and assembly tolerances, provides a tight seal, has a simple structure, is easy to operate, and mitigates vibration and impact.

[0048] like Figure 2 , Figure 3 , Figure 10 , Figure 11 , Figure 12 As 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 within the plug-in portion. Within 11, the first fixed pin base 43 is provided with a plurality of first pins 44, and the first pins 44 are arranged one-to-one with the plug-in through holes 411. One end of the first fixed pin base 43 facing the floating socket base 41 abuts against the limiting protrusion ring 112. The first pins 44 protrude outside 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 socket assembly 42. The end of the first pins 44 away from the double-ended socket assembly 42 is electrically connected to the wire harness in the cable 5.

[0049] like Figure 2 , Figure 3As shown, the anti-disengagement structure 14 includes a buffer rubber pad 141, a clamping ring 142, and a limiting ring 143. A groove 412 is provided at the outer end of the floating socket base 41. The buffer rubber pad 141, the clamping ring 142, and the limiting ring 143 are sequentially arranged within the groove 412. The limiting ring 143 is connected to the inner side of the end of the insertion part 11. The anti-disengagement structure 14 can limit the floating socket base 41 within the insertion part 11 and can buffer stress when inserting or removing the watertight socket 30. The buffer rubber pad 141 can also reduce the impact of vibration on electrical signal transmission and avoid the risk of intermittent signal transmission from seawater oscillations.

[0050] like Figure 10 , 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 when transferring from a normal pressure environment to a high-pressure environment in the deep sea, reducing changes in connection stress. The watertight plug 10 also includes an inner sealing O-ring 16. The inner side of the plug portion 11 has a sealing groove 113 corresponding to the first fixed pin base 43. The inner sealing O-ring 16 is disposed within the sealing groove 113 and surrounds the first fixed pin base 43. The inner sealing O-ring 16 can prevent the first fixed pin base 43 from shaking within the insertion part 11.

[0051] like Figure 2 , Figure 3 As shown, the watertight plug 10 also includes an inner sealing O-ring 16. A sealing groove 113 is provided on the inner side of the plug portion 11 corresponding to the first fixed pin base 43. The inner sealing O-ring 16 is disposed within the sealing groove 113 and surrounds the first fixed pin base 43. The inner sealing O-ring 16 prevents the first fixed pin base 43 from shaking within the plug portion 11.

[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 vulcanized rubber sleeve 9 can seal the cable connection portion 12, providing a waterproof and dustproof effect.

[0053] like Figure 2As shown, the outer surface of the cable connection part 12 is provided with a plurality of circumferential grooves 121, and the inner side of the vulcanized rubber sleeve 9 is provided with a plurality of anti-slip rings 91, and the anti-slip rings 91 are arranged in a one-to-one correspondence with the circumferential grooves 121.

[0054] like Figure 4 , Figure 5 , Figure 13 , Figure 14 As 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.

[0055] The watertight plug provided in this application embodiment has a potting body and a potting seat inside the cylindrical shell of the watertight plug. The outer wall of the potting seat has at least one glue channel. The glue channel can avoid the defects of no channel for the flow of glue outside the potting seat, insufficient glue volume, and poor stability after installation. The glue channel, the gap between the outer wall of the potting seat and the inner wall of the cylindrical shell, and the gap between the inner wall of the potting seat and the outer surface of the cable are all filled with the potting body. The potting body is an integral structure, so that there is glue inside and outside the potting seat. After the glue cures, the potting body is a single piece, forming a stable structure. The glue channel can realize the filling of the internal gap of the watertight plug with glue, thereby improving the high pressure resistance, increasing the adaptability to high water pressure environment, preventing the cylindrical shell from being deformed by excessive pressure, and improving the sealing effect.

[0056] 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.

[0057] 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 watertight plug (10) comprises a cylindrical shell (1), a plug-in connection assembly (4), a cable (5), a glue filling body and a glue filling seat (6); The cylindrical shell (1) is provided with opposite plug-in parts (11) and cable connection parts (12), the plug-in connection assembly (4) is arranged in the plug-in parts (11), the cable (5) extends into the cylindrical shell (1) from the cable connection parts (12) and is electrically connected with the plug-in connection assembly (4), the glue filling seat (6) is arranged on the cable connection parts (12), the glue filling seat (6) is arranged outside the cable (5), at least one glue filling groove (62) is arranged on the outer wall of the glue filling seat (6), glue liquid is injected into the cylindrical shell (1) to fill the glue filling groove (62), the gap between the outer wall of the glue filling seat (6) and the inner wall of the cylindrical shell (1) and the gap between the inner wall of the glue filling seat (6) and the outer wall of the cable (5), and the glue liquid is solidified to form the glue filling body, the glue filling body on the outer wall of the glue filling seat (6) and the glue filling body on the inner wall of the glue filling seat (6) form an integral structure.

2. The watertight plug of claim 1, wherein, The glue filling groove (62) extends along the axial direction of the glue filling seat (6).

3. The watertight plug of claim 1, wherein, The glue filling groove (62) is provided with at least two, and the distance between every two adjacent glue filling grooves (62) is equal.

4. The watertight plug of claim 1, wherein, One end of at least one glue filling groove (62) penetrates the wall of the glue filling seat (6) along the radial direction of the glue filling seat (6) to form an anti-rotation groove (61); a supporting cylinder (8) is further arranged between the glue filling seat (6) and the plug-in connection assembly (4), the supporting cylinder (8) is arranged on the cable (5) and is clamped with the anti-rotation groove (61).

5. The watertight plug of claim 1, wherein, In the axial direction of the glue filling seat (6), the glue filling 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, the inner diameter of the second inner wall (64) remains unchanged, the inner diameter of the second inner wall (64) is greater than the minimum inner diameter of the first inner wall (63) and smaller than the maximum inner diameter of the first inner wall (63), and the inner diameter of the third inner wall (65) gradually decreases first, remains unchanged secondly and gradually increases finally, and the maximum inner diameter of the third inner wall (65) is smaller than the inner diameter of the second inner wall (64).

6. The watertight plug of claim 1, wherein, The watertight plug (10) further comprises a locking sleeve (7), the locking sleeve (7) surrounds the cable (5) and is threadedly connected with the cable connection parts (12), and the locking sleeve (7) axially limits the glue filling seat (6).

7. The watertight plug of claim 1, wherein, The plug-in connection assembly (4) comprises a floating jack base (41), a double-head jack assembly (42), a first fixed pin base (43) and a first pin (44), the floating jack base (41) is provided with a plurality of plug-in through holes (411), the double-head jack assembly (42) is arranged in the plug-in through hole (411), the middle inner side of the plug-in part (11) is provided with a limiting convex ring (112), the end of the plug-in part (11) is provided with an anti-dropping structure (14), the floating jack base (41) is arranged in the plug-in part (11) and abuts against the limiting convex ring (112), the anti-dropping structure (14) limits the floating jack base (41) in the plug-in part (11), the first fixed pin base (43) is provided with a plurality of first pins (44), the first pin (44) is arranged one by one with the plug-in through hole (411), one end of the first fixed pin base (43) facing the floating jack base (41) abuts against the limiting convex ring (112), the first pin (44) protrudes out of the first fixed pin base (43), the first pin (44) is inserted into the plug-in through hole (411) and electrically connected with the double-head jack assembly (42), the end of the first pin (44) away from the double-head jack assembly (42) is electrically connected with the wire harness in the cable (5).

8. The watertight plug of claim 7, wherein, The middle part of the double-head jack assembly (42) is provided with a protrusion (421), the first fixed pin base (43) is provided with a sliding groove (413) corresponding to the protrusion (421), the length of the sliding groove (413) in the extension direction of the first pin (44) is greater than the length of the protrusion (421).

9. The watertight plug of claim 7, wherein, The watertight plug (10) further comprises an inner sealing O-ring (16), the inner side of the plug-in part (11) is provided with a sealing groove (113) corresponding to the first fixed pin base (43), the inner sealing O-ring (16) is arranged in the sealing groove (113) and surrounds the first fixed pin base (43).

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