Electric connector

Abstract

The invention belongs to the technical field of electric connectors, and discloses an electric connector which comprises a connector body, a pipe fitting and a waterproof assembly which are sequentially arranged from front to back, the connector body comprises an insulating shell and an electric connection terminal inserted in an insertion cavity of the insulating shell, an outer clamping ring is coaxially arranged at the rear end of the insulating shell, and the outer clamping ring is coaxially arranged at the rear end of the insulating shell. A first clamping hook is arranged on the inner wall of the rear end of the outer clamping ring; an inner clamping ring inserted into the outer clamping ring is formed at the front end of the pipe fitting, a second clamping hook clamped with the first clamping hook is arranged on the outer wall of the inner clamping ring, and a third convex ring part located at the rear end of the inner clamping ring is arranged on the outer wall of the pipe fitting; the front end face of the third convex ring part abuts against the rear end face of the outer clamping ring.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connectors, and in particular to an electrical connector. Background Art

[0002] The electrical connector mainly comprises a connector body, a curved pipe connected to the rear end of the connector body, and a waterproof component. The connector body mainly comprises an insulating shell and an electrical connection terminal, wherein a plug-in cavity is arranged in the insulating shell, and the electrical connection terminal is arranged in the plug-in cavity along the plug-in direction.

[0003] A snap-fit ​​structure is usually used for quick connection between the connector body and the elbow. The 5015 military-standard connector with the publication number CN116565617A and the name of simplified structure discloses such a snap-fit ​​structure: (i) it includes a second connection part (inner snap ring) arranged outside the outer wall of the front end of the elbow, and a first connection part (outer snap ring) arranged at the rear end of the connector housing, and the outer snap ring is sleeved outside the inner snap ring and snapped with it; (ii) the front end face of the elbow is also provided with an axial groove, and the axial groove radially divides the front end wall of the elbow into a first baffle structure (inner ring wall) and a second baffle structure (outer ring wall); the front end face of the outer ring wall abuts against the rear end face of the insulating housing, and the forward protrusion length of the inner ring wall is greater than the protrusion length of the outer ring wall, so that it can extend into the rear end inner wall of the insulating housing; (iii) a elbow gasket is arranged in the axial groove to seal the connection between the front end face of the elbow and the rear end face of the insulating housing.

[0004] It can be seen that the connector is designed with more complex structures. In order to achieve the clamping and sealing between the front end of the bent pipe and the rear end of the insulating shell, more matching structures make the tolerance requirements of each component high, the product cost is high, and the quality risk is great: First, by adding an annular inner clamping ring to the outer wall of the front end of the bent pipe, the inner clamping ring is an additional structure added to the outside of the pipe wall. The separately set inner clamping ring increases the material cost and manufacturing cost, and leads to complex structure, great difficulty in molding, and high molding cost; the thickness of the inner clamping ring should not be too thin, otherwise it is easy to deform inwards under the action of external force and cause the outer clamping ring at the insulating shell to detach; secondly, there is no protective structure on the rear side of the inner clamping ring to further protect the clamping joint, which may be deformed by external force and ambient temperature during use. When the inner clamping ring is deformed due to the influence of the degree, the outer clamping ring is easy to separate from the inner clamping ring, which reduces the connection stability and easily exposes the electrical connection terminal and the wire connected to it to the outside, affecting the safety performance and electrical connection performance; finally, an axial groove is set on the elbow and the pipe wall, and the pipe wall of the elbow is divided into an inner ring wall and an outer ring wall to place the elbow gasket. The defect is that the thickness of the pipe wall itself is relatively thin. If the groove is opened again, the size of the axial groove cannot meet the requirements, and the radial size of the elbow gasket adapted thereto cannot meet the sealing requirements, and the sealing effect between the elbow and the insulating shell cannot be ensured; if the thickness of the pipe wall of the elbow is increased to make the axial groove and the elbow gasket meet the requirements, the manufacturing cost and material cost are increased.

[0005] In addition, some problems may occur during the plugging process of the butt electrical connection terminal (male terminal) and the electrical connection terminal (female terminal). Due to tolerance reasons in the manufacturing process, or the user's misalignment during plugging, the male terminal may not be smoothly inserted into the plugging space of the female terminal. When the elastic arm end faces of the male terminal and the female terminal produce mutual resistance, it may cause jamming during plugging. This jamming will not only affect the smooth plugging, but may also cause damage to the terminal structure. In severe cases, this resistance force may cause the terminal to deform, rupture or even fail, thereby affecting the performance and reliability of the entire electrical connection system.

[0006] Furthermore, in order to prevent the electrical connection terminal from moving forward and backward in the insulating housing along the plug-in direction, a limiting structure for limiting the movement of the electrical connection terminal along the plug-in direction is usually provided. The conventional limiting structure is mainly realized by the barbs provided on both sides of the electrical connection terminal. These barbs are designed to fit tightly with the inner wall of the plug-in cavity, thereby preventing the electrical connection terminal from moving forward and backward in the insulating housing along the plug-in direction. When the electrical connection terminal is inserted into the plug-in cavity of the insulating housing, the barbs will be in close contact with the inner wall of the plug-in cavity, forming a physical locking effect, ensuring the stability of the electrical connection terminal during use. Since the barbs need to fit tightly with the inner wall of the plug-in cavity, a certain amount of force needs to be applied during the assembly process to correctly insert the electrical connection terminal into place. This not only increases the difficulty of assembly, but may also cause unnecessary damage to the electrical connection terminal or the insulating housing. In addition, as the number of plug-ins and unplugs increases during use, the tight fit between the barbs and the inner wall of the plug-in cavity may gradually loosen. This loosening can cause the position of the electrical connection terminal in the insulating housing to be unstable, thereby affecting the reliability and stability of the electrical connection.

[0007] In addition, the waterproof component is located between the rear end face of the elbow and the connecting nut. Its main function is to prevent external water vapor from entering the interior of the elbow from the threaded connection at the rear end of the elbow, and then prevent water vapor from entering the connector body along the elbow. Traditional waterproof components usually block external water vapor by setting a waterproof ring between the rear end face of the elbow and the connecting nut. However, this waterproof component is relatively thin and easily affected by usage time and environmental factors (such as temperature, humidity, etc.). Over time, the waterproof ring may lose its original waterproof performance due to aging, deformation, displacement, etc., resulting in water vapor penetrating into the interior of the connector, posing a potential threat to the normal operation of the connector. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an electrical connector which improves the connection performance between the connector body and the pipe fitting, has a simpler and more effective structure, and has better sealing performance.

[0009] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide an electrical connector, including a connector body, a pipe fitting and a waterproof component arranged in sequence from front to back, the connector body including an insulating shell and an electrical connection terminal inserted in the plug-in cavity of the insulating shell, the rear end of the insulating shell is coaxially provided with an outer clamping ring, and the rear end inner wall of the outer clamping ring is provided with a first hook; the front end of the pipe fitting is formed with an inner clamping ring inserted in the outer clamping ring, the outer wall of the inner clamping ring is provided with a second hook engaged with the first hook, and the outer wall of the pipe fitting is provided with a third convex ring portion located at the rear end of the inner clamping ring, and the front end face of the third convex ring portion abuts against the rear end face of the outer clamping ring.

[0010] The electrical connector of the present invention has the following beneficial effects: a section of the tube wall located on the front side of the third convex ring portion on the pipe fitting is configured as an inner snap ring, the first hook is arranged at the front end outer wall of the inner snap ring, and the rear end face of the first hook forms a holding face. In this way, the front end wall of the pipe fitting is directly regarded as the inner snap ring, and only the first hook needs to be arranged at the front end outer wall to achieve snap connection with the outer snap ring of the insulating body. When manufacturing the pipe fitting, it is not necessary to design, open the mold, and make the inner snap ring separately, which greatly reduces the time cost, manufacturing cost, and material cost of each link. In addition, when the outer snap ring at the end of the insulating housing is snapped with the inner snap ring, the third convex ring portion can hold the rear end face of the outer snap ring, limit the axial relative position of the outer snap ring and the inner snap ring, and prevent the outer snap ring from being separated due to external force or other factors during subsequent use. During manufacturing, it is only necessary to adapt the diameter of the inner snap ring to the diameter of the rear end of the insulating housing, and to adapt the outer diameter of the third convex ring portion to the outer diameter of the outer snap ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0012] Figure 1 It is a schematic structural diagram of an embodiment of an electrical connector of the present invention.

[0013] Figure 2 yes Figure 1 Longitudinal section view of .

[0014] Figure 3 yes Figure 2 Enlarged view of part A in the figure.

[0015] Figure 4 yes Figure 2 A cross-sectional view of the connector body.

[0016] Figure 5 yes Figure 4 Enlarged view of part B in the middle.

[0017] Figure 6 It is a schematic structural diagram of an embodiment of an electrical connection terminal of the present invention.

[0018] Figure 7 yes Figure 6 Longitudinal section view of .

[0019] Figure 8 It is a schematic diagram of the assembly of the waterproof component and the rear end portion of the pipe of the electrical connector in one embodiment of the present invention.

[0020] Fig. 9yes Figure 8 Exploded diagram.

[0021] Fig.10 yes Figure 8 Exploded view from another angle.

[0022] Fig.11 yes Figure 8 Middle longitudinal section view.

[0023] Fig.12 yes Fig.11 Schematic diagram of the structure behind the waterproof diagram is hidden.

[0024] Fig.13 yes Fig.12 The schematic diagram of the structure behind the waterproof ring cap is hidden in the figure.

[0025] The meanings of the symbols in the accompanying drawings are:

[0026] Connector body 100; insulating housing 110; second external thread 1101; first insulating cylinder 111; insulating ring body 112; second step portion 1121; fourth step portion 1122; second insulating cylinder 113; third step portion 1131; fourth convex ring portion 114; plug-in cavity 11; first cavity 116; second cavity 117; rear stop step 1171; forward stop step 1172; external snap ring 130; first hook 131; inclined surface 131a; second internal thread 132; third assembly space 140; first sealing ring 141; third ring groove 142; external nut 150; plug-in groove 151; second sealing ring 152;

[0027] Electrical connection terminal 120; terminal body 12a; middle portion 121a; partition slit 1211; large outer diameter section 1212; first small outer diameter section 1213; second small outer diameter section 1214; matching portion 122a; second elastic arm 1221; contact convex portion 1221a; arch structure 1221b; plug-in space 1222; second window 1223; third slit 1224; fourth slit 1225; guide convex block 1226; wire holding portion 123a; back portion 1231; first holding arm 1232; second holding arm 1233; forward limiting structure 12b; limiting convex ring 121b; rear limiting structure 12c; first elastic arm 121c; first window 122c; first slit 123c; second slit 124c;

[0028] elbow 200; first nut 210; first internal thread 211; annular retaining edge 212; clamping plane 213; second convex rib 212b; enclosed space 212a; first tube wall 220; second tube wall 230; slot 232; first external thread 231; first assembly space 240; inner snap ring 250; second hook 251; third convex ring portion 260;

[0029] Waterproof assembly 300; waterproof ring 310; annular body 311; first convex ring portion 312; second convex ring portion 313; waterproof ring cap 320; first ring body 321; first step portion 321a; first convex rib 321b; second ring body 322; insert arm 323; second assembly space 330; first ring groove 331; second ring groove 332. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] See also Figure 1 , Figure 2 and Figure 3 The electrical connector of the embodiment of the present invention comprises a connector body 100, a pipe fitting and a waterproof assembly 300 arranged in sequence from front to back. The connector body 100 comprises an insulating housing 110 and an electrical connection terminal 120 inserted into a plug-in cavity 11 of the insulating housing 110. An outer snap ring 130 is coaxially arranged at the rear end of the insulating housing 110, and a first hook 131 is arranged on the inner wall of the rear end of the outer snap ring 130. The pipe fitting can be configured as a curved pipe 200 (hereinafter, the curved pipe 200 is used as an example for explanation). An inner snap ring 250 inserted into the outer snap ring 130 is formed at the front end of the curved pipe 200, and a second hook 251 engaged with the first hook 131 is arranged on the outer wall of the inner snap ring 250, and a third convex ring portion 260 located at the rear end of the inner snap ring 250 is arranged on the outer wall of the curved pipe 200, and the front end face of the third convex ring portion 260 abuts against the rear end face of the outer snap ring 130. The inner wall surface of the first hook 131 is configured as an inclined surface 131 a inclined inwardly and forwardly.

[0034] In this embodiment, a section of the tube wall on the elbow 200 located in front of the third convex ring portion 260 is configured as an inner snap ring 250, and the first hook 131 is provided at the front end outer wall of the inner snap ring 250, and the rear end face of the first hook 131 forms a holding face. In this way, the front end wall of the elbow 200 is directly regarded as the inner snap ring 250, and only the first hook 131 is provided at the front end outer wall to achieve snap connection with the outer snap ring 130 of the insulating body. When manufacturing the elbow 200, it is not necessary to design, open a mold, and make the inner snap ring 250 separately, which greatly reduces the time cost, manufacturing cost, and material cost of each link. In addition, when the outer snap ring 130 at the end of the insulating housing 110 is snapped with the inner snap ring 250, the third convex ring portion 260 can hold the rear end face of the outer snap ring 130, limit the axial relative position of the outer snap ring 130 and the inner snap ring 250, and prevent the outer snap ring 130 from being separated due to external force or other factors during subsequent use. During manufacturing, it is only necessary to adapt the diameter of the inner snap ring 250 to the diameter of the rear end portion of the insulating housing 110 , and to adapt the outer diameter of the third convex ring portion 260 to the outer diameter of the outer snap ring 130 .

[0035] The rear end outer wall of the insulating housing 110 is provided with a second outer thread 1101, the front end inner wall of the outer snap ring 130 is provided with a second inner thread 132 matched with the second outer thread 1101, and the second hook 251 is provided at the rear end inner wall of the outer snap ring 130. The length of the rear end of the outer snap ring 130 exceeding the insulating housing 110 can be adjusted according to the second outer thread 1101 and the second inner thread 132. When the outer snap ring 130 is screwed forward, the length of the rear end of the outer snap ring 130 exceeding the insulating housing 110 decreases, and when the outer snap ring 130 is screwed backward, the length of the rear end of the outer snap ring 130 exceeding the insulating housing 110 increases.

[0036] The axial length between the rear end face of the outer retaining ring 130 and the rear end of the second internal thread 132 is greater than the axial length of the inner retaining ring 250 , that is, greater than the axial length between the front end face of the inner retaining ring 250 and the front end face of the third convex ring portion 260 . In this way, when the second internal thread 132 is flush with the rear end face of the second external thread 1101 and the outer retaining ring 130 is engaged with the inner retaining ring 250, a third assembly space 140 (whose axial dimension is smaller than the axial dimension of the first sealing ring) is formed between the front end face of the inner retaining ring 250 and the rear end face of the insulating shell 110, and a first sealing ring 141 is assembled in the third assembly space 140, and the outer wall surface of the first sealing ring 141 is in contact with the inner wall surface of the outer retaining ring 130, and the front end face and rear end face of the first sealing ring 141 are respectively pressed by the rear end face of the insulating shell 110 and the front end face of the inner retaining ring 250; the outer retaining ring 130 is screwed into the rear end of the insulating shell 110, and when the outer retaining ring 130 is screwed forward, it drives the bent pipe 200 to squeeze the first sealing ring 141 forward to seal the joint between the insulating shell 110 and the bent pipe 200.

[0037] A third annular groove 142 is provided on the inner wall of the outer snap ring 130 at a position corresponding to the first sealing ring 141. The third annular groove 142 is provided at a position between the second internal thread 132 and the first hook 131, and the outer wall of the first sealing ring 141 is accommodated in the third annular groove 142. The insulating housing 110 can adjust the position of its rear end face through the second external thread 1101 and the second internal thread 132, so that the rear end face of the insulating housing 110 can be flush with the front groove wall of the third annular groove 142 or located behind the front groove wall. When the inner snap ring 250 is engaged with the outer snap ring 130, the front end face of the inner snap ring 250 protrudes to a position between the front groove wall and the rear groove wall of the third annular groove 142, so as to cooperate with the rear end face of the insulating housing 110 to press the first sealing ring 141. When the outer clamping ring 130 drives the curved pipe 200 to move forward, the front end of the inner clamping ring 250 at the front end of the curved pipe 200 and the rear end wall of the third annular groove 142 squeeze the first sealing ring 141 together.

[0038] In this embodiment, the second hook 251 is directly set at the front end outer wall of the elbow 200, thereby defining the front end of the elbow 200 to form an inner clamping ring 250. Since there is no need to set another circle of outer clamping ring 130 on the outside of the elbow 200, the front end diameter (including the outer diameter) of the elbow 200 can be consistent with the diameter of the insulating housing 110; when clamped, the front end of the elbow 200 and the rear end of the insulating housing 110 are abutted, and their diameters are adapted. In this way, the overall diameter of the outer clamping ring 130 can be made consistent, and it is not necessary to make it into a two-stage type with variable diameters, which reduces the complexity of the structure, reduces the complexity of assembly, and reduces the manufacturing cost.

[0039] See also Figure 4 and Figure 5 The insulating shell 110 includes a first insulating column 111, an insulating ring body 112 formed by extending backward from the rear end edge of the first insulating column 111, and a second insulating column 113 inserted into the insulating ring body 112; the outer clamping ring 130 is coaxially arranged on the insulating ring body 112.

[0040] The front inner wall of the insulating ring body 112 is provided with a second step portion 1121, and the front outer wall of the second insulating column 113 is provided with a third step portion 1131 that abuts against the second step portion 1121; the rear inner wall of the insulating ring body 112 is provided with a fourth step portion 1122, and the rear outer wall of the second insulating column 113 is provided with a fifth step portion 1132 that abuts against the fourth step portion 1122; the inner wall of the insulating ring body 112 is also provided with at least one guiding and positioning rib (not shown in the figure), and the outer wall of the second insulating column 113 is provided with at least one guiding and positioning groove (not shown in the figure). When assembling the second insulating column 113, its front end face is abutted against the rear end face of the first insulating column 111, and the third step portion 1131 abuts against the second step portion 1121, and the fifth step portion 1132 abuts against the fourth step portion 1122, so as to achieve the front and rear position limitation of the second insulating column 113. The guiding and positioning ribs are used for guiding and positioning when assembling the second insulating cylinder 113 , ensuring that the second insulating cylinder 113 and the first insulating cylinder 111 are aligned, and ensuring smooth assembly of the subsequent electrical connection terminal 120 .

[0041] A fourth convex ring portion 114 is formed between the outer wall of the first insulating column 111 and the outer wall of the insulating ring body 112; an external nut 150 is sleeved on the outer periphery of the first insulating column 111, and the rear end of the external nut 150 is clamped at the rear end of the fourth convex ring portion 114, and a plug-in groove 151 for a docking electrical connector to be plugged into is formed between the external nut 150 and the first insulating column 111, and the front end face of the fourth convex ring portion 114 forms the bottom surface of the plug-in groove 151, and a second sealing ring 152 is provided at the bottom surface of the groove.

[0042] The first insulating column 111 is provided with a first cavity 116 that passes through from front to back, and the second insulating column 113 is provided with a second cavity 117 that is coaxially connected to the first cavity 116. The first cavity 116 and the second cavity 117 are connected to form a plug-in cavity 11 for inserting the electrical connection terminal 120. The front end and the rear end of the electrical connection terminal 120 are both buried in the plug-in cavity 11, thereby improving the voltage resistance performance of the electrical connection terminal 120 and the wire connected thereto.

[0043] A rearward stop step 1171 is formed on the front inner wall of the second cavity 117, and the rearward stop step 1171 is used to limit the rearward movement of the electrical connection terminal 120. A forward stop step 1172 is also provided on the inner wall of the second cavity 117 at the rear side of the rearward stop step 1171, and the forward stop step 1172 is used to limit the forward movement of the electrical connection terminal 120. Specifically, a fifth convex ring portion is provided on the inner wall of the second cavity 117 at one end close to the first cavity 116, and the front end surface of the fifth convex ring portion forms the rearward stop step 1171, and the rear end surface forms the forward stop step 1172.

[0044] See also Figure 6 and Figure 7The electrical connection terminal 120 shown is used to be inserted into the insertion cavity 11 of the insulating shell 110 of the connector body 100. The front end of the electrical connection terminal 120 is plugged with the front end of the mating electrical connection terminal of the mating electrical connector, and the rear end of the electrical connection terminal 120 can be connected and fixed with a board, a wire, etc. The electrical connection terminal 120 includes a terminal body 12a, a forward limiting structure 12b arranged on the terminal body 12a along the length direction of the terminal body 12a and limited by the forward stop step 1172, and a rearward limiting structure 12c limited by the rearward stop step 1171. A plurality of second elastic arms 1221 are arranged at the front end of the terminal body, and the plurality of second elastic arms 1221 enclose a plug-in space 1222 distributed along the length direction of the terminal body 12a; a guide portion for guiding the mating electrical connection terminal is arranged at the plug-in space 1222. The forward limiting structure 12 b is used to limit the forward movement of the terminal body 12 a in the insulating housing 110 , and the backward limiting structure 12 c is used to limit the backward movement of the terminal body 12 a in the insulating housing 110 .

[0045] The terminal body 12a is a cylindrical structure, which is rolled from a metal sheet. Those skilled in the art can understand that the terminal body 12a can also adopt any known terminal structure, such as a sheet-type terminal structure, a columnar terminal structure, etc. The terminal body 12a can include a middle part 121a, a matching part 122a integrally connected to the front end of the middle part 121a, and a mounting part integrally connected to the rear end of the middle part 121a according to its structural features. Both the middle part 121a and the matching part 122a can be configured as a cylindrical (such as a cylindrical) structure, and the cylindrical structure is rolled from a sheet, so that the middle part 121a and the matching part 122a both have a partition slit 1211 that runs through the length direction thereof, and the partition slit 1211 can make the middle part 121a and the matching part 122a have elastic force in the radial direction, so that the terminal body 12a is easy to be assembled in the plug-in cavity 11 of the insulating housing 110, thereby improving the assembly efficiency. The mounting portion can be set according to the connection object. For example, in this embodiment, the connection object of the mounting portion is a wire, so the mounting portion is configured as a wire holding portion 123a for the wire to be connected thereto (such as riveted thereto). For example, in other embodiments, when the connection end of the mounting portion is like a circuit board, the mounting portion can be configured as a solder foot structure that is convenient for soldering on the circuit board.

[0046] The forward limiting structure 12b and the rearward limiting structure 12c are sequentially arranged from back to front along the length direction of the terminal body 12a. For example, the forward limiting structure 12b and the rearward limiting structure 12c are sequentially arranged from back to front on the outer peripheral wall of the middle part 121a.

[0047] The forward limiting structure 12b is configured to be provided with a limiting convex portion around the outer periphery of the terminal body 12a, and the limiting convex portion can be a plurality of limiting convex blocks arranged at intervals around the outer periphery of the terminal body 12a, or a limiting convex ring 121b (the solution adopted in this embodiment) arranged around the outer periphery of the terminal body 12a. The limiting convex ring 121b is integrally formed with the middle part 121a, for example, the cylindrical structure of the middle part 121a is configured as a large outer diameter section 1212 with a larger outer diameter, a first small outer diameter section 1213 coaxially formed at the front end of the large outer diameter section 1212, and a second small outer diameter section 1214 coaxially formed at the rear end of the large outer diameter section 1212. As a result, the large outer diameter section 1212 forms the limiting convex ring 121b protruding outward compared to the first small outer diameter section 1213 and the second small outer diameter section 1214. The limiting convex ring 121b can be a convex part protruding from the surface of the plate by punching down the corresponding area on the plate using a punching unit before the plate is rolled. After rolling into a cylindrical structure, the convex part naturally forms the limiting convex ring 121b with a larger outer diameter.

[0048] The rearward limiting structure 12c is configured as a plurality of first elastic arms 121c arranged around the periphery of the terminal body 12a, and the first elastic arms 121c are inclined backward and outward. A plurality of first windows 122c are provided on the peripheral wall of the terminal body 12a (i.e., the peripheral wall of the middle portion 121a described above), and the plurality of first windows 122c are spaced and distributed around the periphery of the terminal body 12a. The plurality of first elastic arms 121c are respectively arranged in the plurality of first windows 122c, the front end of the first elastic arm 121c is connected to the front side edge of the first window 122c, and the rear end of the first elastic arm 121c extends obliquely backward, forward and outward (outward in the radial direction). The width of the front end of the first elastic arm 121c is greater than the width of the rear end thereof. The front end with a larger width can increase the connection strength between the first elastic arm 121c and the front edge of the first window 122c, and the rear end with a smaller width can make the first elastic arm 121c more elastically deformable, making it easier for the terminal body 12a to be inserted into the plug-in cavity 11 of the insulating housing 110. A first slit 123c is formed between the two lateral sides of the first elastic arm 121c and the two lateral edges of the first window 122c, and a second slit 124c is formed between the rear end face of the first elastic arm 121c and the rear edge of the first window 122c. Thus, except for the front end face of the first elastic arm 121c being connected to the first window 122c, the rest of the first elastic arm 121c is an independent free part, which is easy to elastically deform with the extrusion of the inner wall of the plug-in cavity 11 during assembly, so that the first elastic arm 121c has a higher degree of fit with the plug-in cavity 11, making it easier to assemble. The first window 122c and the first elastic arm 121c can also be formed by stamping technology, that is, before the sheet is rolled, a stamping unit adapted to the shape of the first slit 123c and the second slit 124c is used to stamp downward the corresponding area on the sheet, thereby forming the first window 122c and the first elastic arm 121c connected to the front edge of the first window 122c.

[0049] The mating portion 122a is disposed at the front end of the terminal body 12a, and can be configured to be integrally formed on the terminal body 12a by a stamping process and located at the front end of the middle portion 121a. The mating portion 122a includes a plurality of second elastic arms 1221, and the plurality of second elastic arms 1221 enclose a plug-in space 1222 distributed along the length direction of the terminal body 12a. The guide portion includes a guide protrusion 1226 connected to the terminal body 122a and located at the front end of each second elastic arm 1221, the rear end of the guide protrusion 1226 is closer to the inside, and the front end of the second elastic arm 1221 is closer to the outside. Specifically, the front end peripheral wall of the terminal body 12a is provided with a plurality of second windows 1223, and the plurality of second windows 1223 are spaced around the front end peripheral wall. The plurality of second elastic arms 1221 are respectively arranged in the plurality of second windows 1223, the rear end of the second elastic arm 1221 is connected to the rear edge of the second window 1223, and the front end of the second elastic arm 1221 extends forward and inward (inward in the radial direction). The width of the rear end of the second elastic arm 1221 is greater than the width of the front end thereof. The rear end with a larger width can increase the connection strength between the second elastic arm 1221 and the front edge of the second window 1223, and the front end with a smaller width can make the elastic deformation ability of the second elastic arm 1221 stronger, making it easier for the mating portion 122a to be plugged and matched with the docking electrical connector. The inner side surface of the front end of the second elastic arm 1221 (the side surface facing inward in the radial direction) has a contact convex portion 1221a that is curved inward. Specifically, the front end of the second elastic arm 1221 is an arched structure 1221b that is arched inward, and the inner side surface of the arched structure 1221b forms the contact convex portion 1221a. A third slit 1224 is formed between two lateral sides of the second elastic arm 1221 and two lateral edges of the second window 1223 , and a fourth slit 1225 is formed between a front end surface of the second elastic arm 1221 and a front edge of the second window 1223 .

[0050] Preferably, the guide protrusion 1226 is arranged at a position where the front edge of the second window 1223 is directly opposite to the front end face of the second elastic arm 1221, and the guide protrusion 1226 is extended backward and inward along the length direction of the terminal body 12a, and a third slit 1224 is formed between the rear end face of the guide protrusion 1226 and the front end face of the second elastic arm 1221. The guide protrusion 1226 can prevent the front end face of the second elastic arm 1221 from protruding inwardly from the inner side of the guide protrusion 1226, thereby preventing the butt electrical connection terminal from being stuck by the front end of the second elastic arm 1221 during the insertion process of the plug-in space 1222, and preventing the structure of the second elastic arm 1221 from being damaged. The design of the guide protrusion 1226 can also achieve a guiding effect when the docking electrical connection terminal is inserted into the plug-in space 1222. The guide protrusion 1226 and the front end of the second elastic arm 1221 form an inwardly arched curved surface, which can tighten the plug-in space 1222 and improve the connection stability with the docking electrical connection terminal.

[0051] The wire holding portion 123a is disposed at the rear end of the terminal body 12a, and the wire holding portion 123a has a back portion 1231 with an arc-shaped cross section, and a first holding arm 1232 and a second holding arm 1233 formed on both lateral sides of the back portion 1231, and the first holding arm 1232 and the second holding arm 1233 are staggered along the length direction of the terminal body 12a. Preferably, the first holding arm 1232 is configured as a plurality of arms spaced apart at one lateral side of the back portion 1231 along the length direction of the terminal body 12a, and the second holding arm 1233 is configured as a plurality of arms spaced apart at the back portion 1231 along the length direction of the terminal body 12a. At least one first holding arm 1232 and at least one second holding arm 1233 are staggered in the length direction of the terminal body 12a.

[0052] Based on the above embodiment, the electrical connection terminal 120 shown in the present invention has the following beneficial effects: by setting a guide portion at the plug-in space 1222, the positioning and guiding of the docking electrical connection terminal when it is inserted into the plug-in space 1222 is achieved, which facilitates the electrical connection terminal 120 to be plugged in and out more efficiently and quickly; the guide portion is guided by a guide protrusion 1226 arranged on the front side of each second elastic arm 1221, and the guide protrusion 1226 is inclined toward and inward, and the rear end inner wall of the guide protrusion 1226 is closer to the inside than the front end inner wall of the second elastic arm 1221, so as to prevent the docking electrical connection terminal 120 from abutting against the front end surface of the second elastic arm 1221 when inserted into the plug-in space 1222, thereby protecting the structure of the electrical connection terminal 120 from damage and ensuring the stability and reliability of the electrical connection system. The terminal body 12a is provided with an independent forward limiting structure 12b and a rearward limiting structure 12c along its length direction. The forward limiting structure 12b is used to realize the forward stop of the terminal body 12a in the plug-in cavity 11 of the insulating shell 110, and the rearward limiting structure 12c is used to realize the rearward stop of the terminal body 12a in the plug-in cavity 11 of the insulating shell 110, thereby effectively preventing the terminal body 12a from moving forward and backward. The rearward limiting structure 12c is configured as a plurality of first elastic arms 121c inclined backward and outward, and the rearward limiting structure 12c is located at the front side of the forward limiting structure 12b. When the electrical connection terminal 120 is inserted into the plug-in cavity 11 from back to front, the first elastic arm 121c can be restricted by the inner wall of the plug-in cavity 11 along the plug-in direction and retracted inward. After moving into position, the rear end of the first elastic arm 121c is supported by the rearward stop step 1171 correspondingly arranged on the inner wall of the plug-in cavity 11 (i.e., the inner wall of the above-mentioned second cavity 117), so that the terminal body 12a is limited backward in the plug-in cavity 11. The forward limiting structure 12b adopts a limiting convex ring 121b that is stretched outward from the shell wall of the middle part 121a, and under the action of the micro-elastic force of the separating gap 1211, the limiting convex ring 121b is restricted by the inner wall of the plug-in cavity 11 and retracts inward during the process of inserting the terminal body 12a into the plug-in cavity 11, so that the limiting convex ring 121b can pass through the plug-in cavity 11 smoothly and quickly.In addition, the dividing seam 1211 formed by the rolled electrical connection terminal 120 helps to quickly insert it into the plug-in cavity 11. Since the mating end of the electrical connection terminal 120 is a female end (having a plug-in space 1222 for the docking electrical connection terminal to be inserted therein), during the insertion of the docking electrical connector into the plug-in space 1222, the inner cavity of the electrical connection terminal 120 (the inner cavity of the cylindrical structure) will be squeezed by the docking electrical connector and apply force outward, so that the forward limiting structure 12b and the rearward limiting structure 12c are more tightly pressed against the inner wall of the plug-in cavity 11. Even when the docking electrical connection terminal is pulled out, the inner cavity of the electrical connection terminal 120 only returns to its original position, and the position of the electrical connection terminal 120 in the plug-in cavity 11 will not be affected by the pulling out of the docking electrical connection terminal. Of course, the size of the rear end inner wall cavity section of the plug-in cavity 11 can also be enlarged so that the limiting protrusion ring 121b can move forward freely, and a forward stop step 1172 is provided at a corresponding position on the inner wall of the plug-in cavity 11 to limit the front end face of the limiting protrusion ring 121b, so that the electrical connection terminal 120 is limited forward in the plug-in cavity 11.

[0053] See also Figure 8 , Figure 8 It is a schematic diagram of the assembly of the waterproof component 300 and the rear end of the curved pipe 200. The rear end outer wall of the curved pipe 200 is screwed with a first nut 210, and the waterproof component 300 is used to prevent water vapor from entering the interior of the curved pipe 200 from the screw connection.

[0054] See also Figures 9 to 13 In the embodiment shown, the rear end of the elbow 200 has a first tube wall 220 with a larger outer diameter and a second tube wall 230 with a smaller outer diameter and located at the rear end of the first tube wall 220, and the outer wall of the second tube wall 230 is formed with a first external thread 231. The outer wall of the first nut 210 is provided with a plurality of clamping planes 213 distributed around the circumference thereof, and the inner wall of the first nut 210 is provided with a first internal thread 211 matched with the first external thread 231, and the first nut 210 is screwed to the first external thread 231 through its first internal thread 211. The inner wall of the rear end of the first nut 210 is formed with an annular retaining edge 212, which is formed by the inner wall of the rear end of the first nut 210 protruding inwardly along its radial direction. The inner diameter of the space 212a (i.e., the inner hollow part) enclosed by the annular retaining edge 212 is smaller than the inner diameter of the part of the first nut 210 located in front of the annular retaining edge 212. That is, the first nut 210 has two inner diameters of different sizes, wherein the inner diameter of the front part of the annular retaining edge 212 is adapted to the outer diameter of the second tube wall 230 , and the inner diameter of the space 212a enclosed by the annular retaining edge 212 is adapted to the inner diameter of the bent pipe 200 .

[0055] The axial length of the first nut 210 is greater than the axial length of the second tube wall 230 of the elbow 200. Therefore, when the first nut 210 is screwed on the second tube wall 230, a first assembly space 240 exists between the front end face of the annular retaining edge 212 and the rear end face of the elbow 200 (the rear end face of the second tube wall 230), and the axial size of the first assembly space 240 changes with the forward and backward movement of the first nut 210. That is, the front end face of the annular retaining edge 212, the rear end face of the elbow 200, and a section of the inner wall of the first nut 210 located therebetween form the first assembly space 240.

[0056] The waterproof component 300 includes a waterproof ring 310 and a waterproof ring cap 320 that is sleeved on the outside of the waterproof ring 310 and tightly fitted therewith. The front end portion of the waterproof ring cap 320 and the waterproof ring 310 are crimped in the first assembly space 240 from back to front, and the rear end portion of the waterproof ring cap 320 and the waterproof ring 310 are inserted into the space 212a enclosed by the annular retaining edge 212.

[0057] Specifically, the waterproof ring cap 320 includes a first ring body 321 whose outer diameter is matched with the outer diameter of the rear end of the elbow 200 (the outer diameter of the second tube wall 230) and the inner diameter of the first nut 210, a second ring body 322 formed at the rear end of the first ring body 321, and a plurality of insert arms 323 (for example, two symmetrically arranged in this embodiment) distributed at the front end of the first ring body 321 in a circumferentially spaced manner around the first ring body 321. The outer diameter of the second ring body 322 is matched with the inner diameter of the space 212a enclosed by the annular retaining edge 212. The plurality of insert arms 323 extend forward from the front end of the first ring body 321, and correspondingly, a plurality of slots 232 are arranged on the outer wall of the rear end of the elbow 200 (the outer wall of the second tube wall 230) at the positions of the plurality of insert arms 323, and the plurality of insert arms 323 are respectively inserted into the plurality of slots 232 along the axial direction of the elbow 200. The configuration of the multiple insert arms 323 and the slots 232 can enable the waterproof ring cap 320 to be stably positioned on the rear end face of the bent pipe 200 during the locking process of the first nut 210, thereby preventing the waterproof ring 310 from being assembled incorrectly due to eccentricity, ensuring that the waterproof ring cap 320 and the waterproof ring 310 therein always remain coaxial with the bent pipe 200 and the first nut 210, thereby improving the accuracy of position assembly and ensuring waterproof performance.

[0058] The first ring body 321 as the front end portion of the waterproof ring cap 320 is accommodated in (crimped to) the first assembly space 240, and the second ring body 322 as the rear end portion of the waterproof ring cap 320 is inserted into the enclosed space 212a.

[0059] A second assembly space 330 is formed between the inner wall of the first ring body 321 and the inner wall of the elbow 200, in which the front end portion of the waterproof ring 310 is assembled, and the front end portion of the waterproof ring 310 is tightly fitted in the second assembly space 330. The front end surface of the first ring body 321 abuts against the rear end surface of the elbow 200 (second tube wall 230), the outer wall of the first ring body 321 is matched with the inner wall of the first nut 210, and the rear end surface of the first ring body 321 forms a first step portion 321a, which abuts against the front end surface of the annular retaining edge 212. The first step portion 321a is provided with a plurality of first ribs 321b at intervals around the circumference thereof. The plurality of first ribs 321b are radially distributed with the center of the first step portion 321a as the center of the circle. The length of each first rib 321b is adapted to the radial dimension of the first step portion 321a, and the convex surface of each first rib 321b is an arc surface that bends backward. Correspondingly, the front end surface of the annular retaining edge 212 is provided with a plurality of second ribs 212b corresponding to the plurality of first ribs 321b. The length of each second rib 212b is adapted to the radial dimension of the annular retaining edge 212, and the convex surface of each second rib 212b is an arc surface that bends forward. When the first nut 210 is being screwed, the first rib 321b and the second rib 212b are continuously misaligned in the circumferential direction to generate sound, thereby improving the user experience. At the same time, the first rib 321b and the second rib 212b can increase the structural strength.

[0060] The second assembly space 330 can be formed by the following structure: a first annular groove 331 is formed on the inner wall of the first ring body 321, the first annular groove 331 penetrates the front end surface of the first ring body 321 in the forward direction, and the first annular groove 331 also penetrates the inner wall of the first ring body 321 in the radial direction inwardly. The annular side wall of the first annular groove 331 is inclined forward and outward, so that the angle between the annular side wall of the first annular groove 331 and the groove bottom wall of the first annular groove 331 is an obtuse angle greater than 90 degrees. Such a configuration can increase the radial size of the second assembly space 330, increase the volume and surface area of ​​the front end part of the waterproof ring 310 (the part pressed and assembled in the second assembly space 330), increase the contact area between the waterproof ring 310 and the second assembly space 330, and improve the waterproof sealing performance.

[0061] The rear end inner wall of the elbow 200 is formed with a second annular groove 332 which is directly opposite to the first annular groove 331. The second annular groove 332 penetrates the rear end surface of the elbow 200 in the rear direction and penetrates the rear end inner wall of the elbow 200 in the radial direction inwardly. The groove bottom wall of the first annular groove 331, the annular side wall of the first annular groove 331, the annular bottom wall of the second annular groove 332 and the annular side wall of the second annular groove 332 enclose a second assembly space 330 with an opening facing inward, and the front end portion of the waterproof ring 310 is crimped into the second assembly space 330. The annular side wall of the second annular groove 332 is inclined backward and outward, so that the angle between the annular side wall of the second annular groove 332 and the groove bottom wall of the second annular groove 332 is an obtuse angle greater than 90 degrees. Similarly, such a configuration can increase the radial dimension of the second assembly space 330, and two ring side walls facing different directions form two contact surfaces, both of which are inclined. The advantage is that the axial length of the first ring groove 331 and the second ring groove 332 is extended while the axial length of the first ring body 321 remains unchanged, thereby extending the axial length of the second assembly space 330, increasing the contact area between the waterproof ring 310 and the second assembly space 330, and improving the waterproof sealing performance.

[0062] The outer wall of the waterproof ring 310 is tightly matched with the inner wall of the waterproof ring cap 320. The waterproof ring 310 includes an annular body 311, a first convex ring portion 312 formed at the front end outer wall of the annular body 311 and having a shape adapted to the second assembly space 330, and a second convex ring portion 313 formed at the rear end outer wall of the annular body 311. The outer wall of the waterproof ring 310 except the first convex ring portion 312 is tightly matched with the inner wall of the waterproof ring cap 320 except the first annular groove 331. The first convex ring portion 312, as the front end portion of the waterproof ring 310, is tightly matched in the second assembly space 330, the outer surface shape of the first convex ring portion 312 is adapted to the second assembly space 330, and the front end surface of the first convex ring portion 312 is located in the same plane as the front end surface of the annular body 311. When the first convex ring portion 312 is pressed into the second assembly space 330, the front end faces of the first convex ring portion 312 and the annular body 311 are pressed against the bottom surface of the second annular groove 332, the outer peripheral surface of the first convex ring portion 312 is tightly fitted into the annular side walls of the first annular groove 331 and the second annular groove 332, and the rear end face of the first convex ring portion 312 is aligned with the bottom surface of the first annular groove 331.

[0063] Based on the above embodiment, when the waterproof component 300 is assembled to the rear end of the elbow 200, first, the waterproof ring cap 320 is pressed onto the outer periphery of the waterproof ring 310, the rear end face of the waterproof ring 310 is flush with the rear end face of the waterproof ring cap 320, the first convex ring of the waterproof ring 310 is located in the first annular groove 331, and the outer wall of the waterproof ring 310 is tightly matched with the inner wall of the waterproof ring cap 320; secondly, the insert arm 323 of the waterproof ring cap 320 is inserted into the slot 232 to coaxially position the waterproof ring cap 320 and the waterproof ring 310. The rear end face of the bent pipe 200; again, the first nut 210 is screwed to the outer wall of the rear end of the bent pipe 200. During this process, as the first nut 210 gradually moves forward, the rear end of the waterproof ring cap 320 passes through the annular retaining edge 212 and is flush with the rear end face of the first nut 210. The annular retaining edge 212 of the first nut 210 gradually presses the waterproof ring cap 320 and the waterproof ring 310 forward, thereby making the waterproof ring 310 axially pressed between the rear end face of the bent pipe 200 and the annular retaining edge 212 of the first nut 210 to achieve sealing.

[0064] Based on the above embodiments, the waterproof assembly 300 shown in the present invention has the following beneficial effects: the waterproof ring 310 is positioned by the waterproof ring cap 320, so as to prevent the waterproof ring 310 from deviating during the assembly process and causing the problem of loose sealing; compared with the traditional thin-sheet waterproof ring 310, the waterproof ring 310 has a larger axial dimension and is fixed and positioned by the waterproof ring cap 320, so that it is not easy to deform and shift, thereby solving the problems of poor waterproof performance and easy deformation of the traditional thin-sheet waterproof ring 310; the waterproof assembly 300 is arranged on the first nut 210 The rear end portion of the elbow 200 and the rear end face of the elbow 200 are compressed between them during the process of screwing the first nut 210, and the operation is extremely simple and quick, which reduces the complexity of assembly and improves the assembly efficiency; the screw locking method of the first nut 210 can effectively press the waterproof component 300 to the rear end of the elbow 200. Even if the waterproof ring 310 shrinks later, a surplus space can be set between the front end face of the first nut 210 and the first tube wall 220, so that the first nut 210 can be tightened again to compress the shrunk sealing ring, thereby improving the waterproof sealing efficiency.

[0065] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electrical connector, comprising a connector body, a pipe fitting and a waterproof assembly arranged in sequence from front to back, wherein the connector body comprises an insulating housing and an electrical connection terminal inserted into a plug-in cavity of the insulating housing, characterized in that: An outer clamping ring is coaxially arranged at the rear end of the insulating shell, and a first hook is arranged on the inner wall of the rear end of the outer clamping ring; an inner clamping ring inserted into the outer clamping ring is formed at the front end of the pipe fitting, and a second hook engaged with the first hook is arranged on the outer wall of the inner clamping ring; a third convex ring portion located at the rear end of the inner clamping ring is arranged on the outer wall of the pipe fitting, and the front end face of the third convex ring portion abuts against the rear end face of the outer clamping ring.

2. The electrical connector according to claim 1, wherein: The diameter of the inner retaining ring is matched with the diameter of the rear end portion of the insulating shell; when the inner retaining ring is engaged with the outer retaining ring, a third assembly space is formed between the front end face of the inner retaining ring and the rear end face of the insulating shell, and a first sealing ring is assembled in the third assembly space, the outer wall surface of the first sealing ring is in contact with the inner wall surface of the outer retaining ring, the front end face and the rear end face of the first sealing ring are respectively pressed by the rear end face of the insulating shell and the front end face of the inner retaining ring, and the outer retaining ring is screwed on the rear end of the insulating shell. When the outer retaining ring is screwed forward, it drives the pipe fitting to squeeze the first sealing ring forward to seal the joint between the insulating shell and the pipe fitting.

3. The electrical connector according to claim 2, wherein: A third annular groove is provided on the inner wall of the outer retaining ring at a position corresponding to the first sealing ring, and the outer wall of the first sealing ring is accommodated in the third annular groove; the rear end face of the insulating shell and the front side groove wall of the third annular groove are located in the same plane or the rear end face of the insulating shell is located behind the front side groove wall of the third annular groove; when the inner retaining ring is engaged with the outer retaining ring, the front end face of the inner retaining ring protrudes to the position between the front side groove wall and the rear side groove wall of the third annular groove, so as to cooperate with the rear end face of the insulating shell to press the first sealing ring.

4. The electrical connector according to claim 3, wherein: The rear end outer wall of the insulating shell is provided with a second external thread, the front end inner wall of the external retaining ring is provided with a second internal thread matching the second external thread, and the third annular groove is provided between the second internal thread and the first hook; the insulating shell can adjust the position of its rear end face through the second external thread and the second internal thread so that the rear end face of the insulating shell can be flush with the front side groove wall of the third annular groove or be located behind the front side groove wall.

5. The electrical connector according to claim 1, wherein: The insulating shell includes a first insulating column, an insulating ring formed by the rear end edge of the first insulating column extending backward, and a second insulating column inserted in the insulating ring; the outer clamping ring is coaxially arranged on the insulating ring.

6. The electrical connector according to claim 5, wherein: A second step portion is protruding from the inner wall of the front end of the insulating ring body, and a third step portion that abuts against the second step portion is provided at the outer wall of the front end of the second insulating column; a fourth step portion is provided at the inner wall of the rear end of the insulating ring body, and a fifth step portion that abuts against the fourth step portion is provided at the outer wall of the rear end of the second insulating column; at least one guiding and positioning rib is also provided on the inner wall of the insulating ring body, and at least one guiding and positioning groove is matchedly provided on the outer wall of the second insulating column.

7. The electrical connector according to claim 5, wherein: The first insulating column is provided with a first cavity that passes through from front to back, and the second insulating column is provided with a second cavity that is coaxially connected to the first cavity. The first cavity and the second cavity are connected to form a plug-in cavity for inserting the electrical connection terminal, and the front end and the rear end of the electrical connection terminal are both buried in the plug-in cavity.

8. The electrical connector according to claim 7, wherein: A rearward stop step is formed on the front inner wall of the second cavity, and the rearward stop step is used to limit the rearward movement of the electrical connection terminal. A forward stop step is also provided on the second cavity at the rear side of the rearward stop step, and the forward stop step is used to limit the forward movement of the electrical connection terminal. The electrical connection terminal includes a terminal body, a forward limit structure provided on the terminal body along the length direction of the terminal body and cooperates with the forward stop step, and a rearward limit structure cooperates with the rearward stop step.

9. The electrical connector according to claim 5, wherein: A fourth convex ring portion is formed between the outer wall of the first insulating column and the outer wall of the insulating ring body; an external nut is sleeved on the outer periphery of the first insulating column, and the rear end of the external nut is clamped at the rear end of the fourth convex ring portion. A plug-in groove for a docking electrical connector to be plugged into is formed between the external nut and the first insulating column, and the front end face of the fourth convex ring portion forms the bottom surface of the plug-in groove, and a second sealing ring is provided at the bottom surface of the groove.

10. The electrical connector according to any one of claims 1 to 9, characterized in that: A first nut is screwed onto the rear end outer wall of the pipe fitting, an annular retaining edge is formed on the rear end inner wall of the first nut, and a first assembly space is formed between the front end face of the annular retaining edge and the rear end face of the pipe fitting; the waterproof component includes a waterproof ring and a waterproof ring cap which is sleeved on the outside of the waterproof ring and tightly fitted with the waterproof ring, the waterproof ring cap and the front end part of the waterproof ring are crimped into the first assembly space from back to front, and the waterproof ring cap and the rear end part of the waterproof ring are inserted into the space enclosed by the annular retaining edge.

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