CN204289872U - Electric connector - Google Patents

Abstract

An electrical connector includes an outer shielding shell, a fixing element, a composite module and an insulating shell; the fixing element includes a top plate and at least one grounding fixing foot, and the at least one grounding fixing foot protrudes outward from the An insulating shell; the top plate of the fixing element is fixed together with the outer shielding shell, and the outer shielding shell and the fixing element are insert-molded in the insulating shell; the composite module includes a composite insulating body and is arranged on the composite insulating body A group of upper-row terminals, a group of lower-row terminals, and an intermediate shielding sheet between the upper-row terminals and the lower-row terminals, wherein a plurality of first groove; the rear of the composite insulating body is coated with a layer of sealant, and the sealant penetrates forward along these first grooves between the composite insulating body and the insulating shell, which can effectively prevent external water droplets from penetrating the electrical connector Internal gaps leak back into the interior of the electronics.

Description

electrical connector

technical field

The utility model relates to an electric connector, in particular to a waterproof sealing structure of the electric connector.

Background technique

Chinese patent CN201220625812.1 discloses an electrical connector, which includes an insulating body, conductive terminals fixed on the insulating body, and a shielding shell covering the insulating body. The bottom wall opposite to the wall and the two side walls connecting the top wall and the bottom wall. The electrical connector also includes an auxiliary shell covering the outside of the shielding shell. The auxiliary shell is provided with a The top plate of the top wall of the body, the two side plates extending downward from both sides of the top plate and attached to the two side walls of the shielding housing, and the mounting feet respectively extending downward from the lower ends of the two side plates: the electrical connector also includes A waterproof casing covering the periphery of the shielding casing, the auxiliary casing is embedded in the waterproof casing, and the mounting feet protrude downward from the waterproof casing. The insulating body is provided with a base, and the shielding shell is provided with a sealing portion that covers the periphery of the base in a ring shape, and a recessed groove is formed around the base in contact with the sealing portion, and the electrical connection A device is provided with a sealing unit disposed in the groove to seal a contact portion between the closing portion and the base. This sealing unit can only seal the gap between the shielding case and the base of the insulating body, but outside water droplets can also pass through the fitting gap between the shielding case and the auxiliary case or from the joint on the top wall of the shielding case. The seam flows backward into the interior of the electronic device, and the waterproof sealing effect is still not ideal.

Utility model content

The technical problem to be solved by the utility model is mainly to overcome the shortcomings of the above-mentioned prior art, thereby proposing an electrical connector, which can effectively prevent external water droplets from penetrating backward into the electronic equipment through the gap inside the electrical connector . ``

The utility model proposes an electrical connector aiming at the above-mentioned technical problems, which includes an outer shielding shell formed with a cavity extending back and forth, a fixing element fixed on the outside of the outer shielding shell, and a composite mold inserted in the cavity. group and an insulating shell surrounding the outer shielding shell and the outer periphery of the composite module; the fixing element includes a top plate and at least one grounding fixing foot extending from the top plate, and the at least one grounding fixing foot protrudes outward from the Insulating shell; the top plate of the fixing element is fixed together with the outer shielding shell, the outer shielding shell and the fixing element are embedded in the insulating shell, and the composite module is inserted from the rear of the insulating shell to the front In the cavity of the outer shielding shell; the composite module includes a composite insulating body and a set of upper row terminals, a group of lower row terminals and a set of terminals located between the upper row terminals and the lower row terminals arranged on the composite insulating body An intermediate shielding sheet, wherein at least one first groove is formed between the rear end of the composite insulating body and the insulating shell; a layer of sealant is arranged at the rear of the composite insulating body, and the sealant is arranged along the at least one first groove. The groove penetrates forward between the composite insulating body and the insulating shell, and fully seals the rear of the composite insulating body.

In some embodiments, a step is formed on the rear of the insulating shell, a flange is formed on the rear of the composite insulating body, and the at least one first groove is recessed and formed on the rear of the step. the outer peripheral surface of the flange.

In some embodiments, the at least one first groove extends along the front-to-back direction, and extends forward to the step.

In some embodiments, the front surface of the composite insulation body on both sides of the flange is recessed backward to form a positioning groove; the two sides of the outer shielding shell respectively extend a positioning foot backward, and the two positioning feet Insert them backwards into the two positioning slots.

In some embodiments, the insulating shell encloses a receiving groove at the rear end of the composite insulating body, and the sealant is filled in the receiving groove.

In some embodiments, the outer shielding shell includes a bottom wall, two side walls extending upwards from both sides of the bottom wall, and the top ends of the two side walls are bent and then extended toward each other. A top wall, the top wall has a pair of joints, the cavity is surrounded by the bottom wall, two side walls and the top wall; the top plate of the fixing element is welded and fixed on the top wall seams on both sides.

In some embodiments, the intermediate shielding sheet includes a base plate and at least one first soldering leg extending backward from the base plate out of the composite insulating body; Two welding feet, wherein the first welding feet and the second welding feet are distributed on the same welding plane and aligned laterally.

In some embodiments, the electrical connector further includes an inner shielding shell installed on the outer periphery of the composite insulating body and inside the outer shielding shell, and the inner shielding shell is composed of two shielding shells respectively located on the upper and lower sides of the composite insulating body. A combination of shielding pieces, each side of each shielding piece vertically extends a fixed tab; both sides of the composite insulating body are formed with a fastening hole that penetrates up and down and is closed around, and the two shielding pieces have The fixing tabs are correspondingly snapped into the two fastening holes.

In some embodiments, the composite insulating body is composed of an upper insulator and a lower insulator, the set of upper-row terminals is embedded in the upper insulator, the set of lower-row terminals is embedded in the lower insulator, the upper insulator and the The lower insulator respectively extends forward with a first tongue portion and a second tongue portion, and the intermediate shielding sheet is interposed between the first tongue portion of the upper insulator and the second tongue portion of the lower insulator; There are a plurality of at least one first groove, which are respectively formed on the outer peripheral edges of the rear part of the upper insulator and the lower insulator; at least one second groove is also formed between the upper insulator and the lower insulator, and the sealant is also Infiltrating forward along the at least one second groove between the upper insulator and the lower insulator.

In some embodiments, the composite insulating body is composed of a main insulator, an upper insulator and a lower insulator, the set of upper-row terminals is embedded in the upper insulator, and the set of lower-row terminals is embedded in the lower insulator; An integral tongue plate extends forward from the main insulator, and the intermediate shielding piece is embedded in the tongue plate of the main insulator, and the group of upper row terminals and the group of lower row terminals are respectively exposed on the upper and lower sides of the tongue plate; There are a plurality of at least one first groove, respectively formed on the outer periphery of the upper insulator, the lower insulator, and the rear part of the main insulator; at least one second groove is also formed between the upper insulator and the lower insulator, the The sealant also penetrates forwardly along the at least one second groove between the upper insulator and the lower insulator.

Compared with the prior art, the electrical connector of the present utility model inserts the fixing element and the outer shielding shell into the insulating shell, and then inserts the composite module into the cavity of the outer shielding shell from back to front, And a plurality of first grooves are formed between the rear end of the composite insulating body and the insulating shell, and then the sealant is arranged on the rear end of the composite insulating body, and the sealant can penetrate forward through these first grooves, Form a sealing unit that fully closes the rear portion of the composite insulating body, and can be firmly bonded to the insulating shell, thereby effectively preventing external water droplets from penetrating backward into the electronic device through the gap inside the electrical connector; in addition, The intermediate shielding sheet can effectively reduce the crosstalk between the upper-row terminals and the lower-row terminals during high-frequency transmission, so as to facilitate the application of the electrical connector to the transmission of high-frequency information.

Description of drawings

Figure 1 and Figure 2 are perspective views of a preferred embodiment of the utility model electrical connector;

Fig. 3 is a front view of the electrical connector shown in Fig. 1;

Fig. 4 is a sectional view taken along the section line A-A in Fig. 3;

Fig. 5 is a three-dimensional exploded view of the electrical connector shown in Fig. 1;

6 and 7 are further exploded perspective views of the electrical connector shown in FIG. 5;

Fig. 8 is a perspective exploded view of further disassembly of the electrical connector shown in Fig. 7;

Fig. 9 is a perspective exploded view of a further decomposition of the electrical connector shown in Fig. 8;

Fig. 10 is a further exploded perspective view of the electrical connector shown in Fig. 9;

Fig. 11 is a front view of another preferred embodiment of the electrical connector of the present invention;

Fig. 12 is a sectional view taken along the B-B section line in Fig. 11;

Fig. 13 is an exploded perspective view of the electrical connector shown in Fig. 11;

14 and 15 are further exploded perspective views of the electrical connector shown in FIG. 13;

FIG. 16 is a further exploded perspective view of the electrical connector shown in FIG. 14 .

Wherein, the reference signs are explained as follows:

10 electrical connectors

1 outer shielding shell

11 Bottom wall 12 Side wall 13 Top wall 14 Positioning foot 19 Cavity 131 Butt seam

2 Fixing elements

21 Top plate 22 Extension 23 Grounding anchor 29 Welding point

3 insulating shell

38 steps 39 hollows

4 composite modules

41 Upper terminal module 42 Lower terminal module 43 Intermediate shield 44 Composite insulating body

411 Upper insulator 412 Upper terminal 413 First groove 414 Second groove

4113 First tongue plate

416 Positioning groove 417 Fastening hole 421 Lower insulator 422 Lower row of terminals

4213 Second lingual plate

423 First Groove 424 Second Groove 426 Positioning Groove 427 Fastening Hole 429 Protrusion

431 Substrate 432 Soldering feet 4222 Soldering feet

441 Flange 442 Base 443 Tongue

444 Second groove 446 Positioning groove 447 Fastening hole

5 Inner shield shell 51 Shield sheet 517 Fixing tab

6 sealant

61 base 63 first extension 64 second extension

7 storage tanks

10a electrical connector

4a composite module

41a upper terminal module 411a upper insulator 412a upper terminal

42a lower terminal module 421a lower insulator 422a lower terminal

44a Composite insulating body

46a Intermediate module 461a Main insulator 467a Fastening hole 43a Intermediate shield

4611a base 4612a tongue plate 4613a receiving space 4614a terminal receiving groove

4615a First Groove

6a Sealants.

Detailed ways

Although the present invention may be readily manifested in different forms of embodiments, only some of them are shown in the drawings and described in detail in this specification, and it should be understood that this specification should be considered as This is an exemplary illustration of the principles of the utility model, and is not intended to limit the utility model to what is described here.

Therefore, a feature indicated in this specification will be used to describe one of the features of an embodiment of the present invention, rather than implying that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly described. Thus, the illustrated combinations are not intended to be limiting unless otherwise stated.

In the embodiments shown in the drawings, directional indications (such as up, down, left, right, front and back) are used to explain that the structure and movement of various elements of the present invention are not absolute but relative. These descriptions are applicable when the elements are in the positions shown in the drawings. If the indications of the positions of these elements are changed, the indications of these directions are changed accordingly.

Below in conjunction with the accompanying drawings of this specification, the preferred embodiments of the utility model are further elaborated.

Referring to FIG. 1 to FIG. 10 , it is a preferred embodiment of the electrical connector of the present invention. Specifically, this embodiment is a USB3.0 Type-C connector with a sealed waterproof structure. The electrical connector 10 includes an outer shielding shell 1 with a cavity 19 extending back and forth, a fixing element 2 fixed on the outside of the outer shielding shell 1, and an outer periphery of the outer shielding shell 1 and the fixing element 2 overmolded. An insulating shell 3, a composite module 4 inserted in the cavity 19 from back to front, an inner shielding shell 5 mounted on the composite module 4, and an inner shielding shell 5 for fully sealing the composite module 4 rear end A layer of sealant 6.

Referring to Fig. 9 and Fig. 10, the outer shielding shell 1 is integrally formed by bending a metal plate, and it includes a bottom wall 11, two side walls 12 bent upwards from both sides of the bottom wall 11 and extending from the bottom wall 11. A top wall 13 is formed by bending the top ends of the two side walls 12 and extending towards each other. The top wall 13 has a pair of seams 131 . A positioning foot 14 extends rearwardly from each of the two side walls 12 . The bottom wall 11 , the two side walls 12 and the top wall 13 enclose the aforementioned cavity 19 .

Referring to FIG. 8 and FIG. 9 , the fixing element 2 is integrally bent from a metal plate, and includes a top plate 21 and two grounding fixing feet 23 bent downwards from both sides of the top plate 21 . The top plate 21 is fixed on both sides of the butt joint 131 of the top wall 13 of the outer shielding case 1 by laser welding. Four laser welding spots 29 are shown in FIG. 9 . This structure can strengthen the overall strength of the outer shielding shell 1 to prevent force deformation and cracking at the butt seam 131 , thereby ensuring reliable butt joint between the electrical connector 10 and another butt connector (not shown).

Referring to FIG. 7 to FIG. 10 in conjunction, the insulating housing 3 is formed by integral injection molding of insulating materials. Wherein the outer shielding shell 1 and the fixing element 2 are insert-molded in the insulating shell 3 together. The outer shielding shell 1 and the top plate 21 of the fixing element 2 are completely buried in the insulating shell 3 . This structure can completely eliminate the possible fit gap between the outer shielding shell 1 and the insulating shell 3, which is beneficial to waterproofing. A hollow cavity 39 is formed inside the insulating housing 3 . A ring-shaped step 38 is formed at the rear of the hollow cavity 39 of the insulating shell 3 , so that the rear opening of the hollow cavity 39 has a larger size than the front opening.

4 and 6, from the perspective of the overall structure, the composite module 4 includes a composite insulating body 44 and a group of upper row terminals 412, a group of lower row terminals 422 and a group of upper row terminals 422 arranged on the composite insulating body 44. An intermediate shielding sheet 43 between the terminal 412 and the lower row of terminals 422 . The composite insulating body 44 generally includes a base 442 , a tongue 443 extending forward from the base 442 , and a flange 441 located behind the base 442 and protruding annularly outward. A plurality of first grooves 413, 423 are formed between the rear end of the composite insulating body 44 and the insulating shell 3; a layer of sealant 6 is applied to the rear of the composite insulating body 44, and the sealant 6 is arranged along these first grooves. A groove 413 , 423 penetrates forward between the composite insulating body 44 and the insulating shell 3 , and fully seals the rear of the composite insulating body 44 .

Referring to FIG. 9 and FIG. 10 , the compound module 4 specific to this preferred embodiment is composed of an upper row of terminal modules 41 , a lower row of terminal modules 42 and an intermediate shielding sheet 43 . The upper-row terminal module 41 includes an upper insulator 411 and an upper-row terminal 412 insert-molded in the upper insulator 411 . A first tongue portion 4113 extends forward from the upper insulator 411 , and a plurality of first grooves 413 extending along the front-to-back direction are formed on the top surface and two side surfaces of the rear portion of the upper insulator 411 . It is worth mentioning that, in some embodiments, the first groove (not shown in the figure) can also be formed on the inner surface of the insulating shell 3 and the flange 441. In addition, in some embodiments, These first grooves (not shown in the figure) may also extend along the front-back direction in a wave shape. A plurality of second trenches 414 are formed on the bottom surface of the upper insulator 411 . The upper insulator 411 defines a forward-opening positioning slot 416 on both sides of the front surface of the flange 441 . Both sides of the middle portion of the upper insulator 411 are respectively formed with a fastening hole 417 penetrating up and down and closed around.

Similarly, the lower row terminal module 42 includes a lower insulator 421 matched with the upper insulator 411 and a lower row of terminals 422 insert-molded in the lower insulator 421 . A second tongue portion 4213 extends forward from the lower insulator 421 , and a plurality of first grooves 423 are formed on the bottom surface and two side surfaces of the rear portion of the lower insulator 421 . A plurality of second trenches 424 are formed on the top surface of the lower insulator 421 . The lower insulator 421 is formed with a positioning slot 426 opening forward on both sides of the front surface of the flange 441 . Two sides of the middle portion of the lower insulator 421 are respectively formed with a fastening hole 427 penetrating up and down and closed around.

Referring to FIG. 6 and FIG. 8 , the upper insulator 411 and the lower insulator 421 are combined to form the composite insulating body 44 . Wherein, the second groove 414 of the upper insulator 411 corresponds to the second groove 424 of the lower insulator 421 to form a complete second groove 444 . The fastening hole 427 of the lower insulator 421 is corresponding to the fastening hole 417 of the upper insulator 411 to form a fastening hole 447 penetrating up and down and closed around. The positioning groove 426 of the lower insulator 421 is matched with the positioning groove 416 of the upper insulator 411 to form a complete positioning groove 446 .

Referring to Fig. 9, the lower insulator 421 forms a plurality of protrusions 429 on the surface matched with the upper insulator 411, and these protrusions 429 will melt when the upper insulator 411 and the lower insulator 421 are ultrasonically welded to make the upper insulator 421 The insulator 411 is fixedly combined with the lower insulator 421 .

Referring to FIG. 4 , FIG. 6 and FIG. 10 , each bottom row of terminals 422 has a welding foot 4222 bent backwards and extending out of the composite insulating body 44 . The welding feet 4222 can be fixed to a circuit board (not shown) by surface welding.

Referring to FIG. 9 and FIG. 10 , the intermediate shielding sheet 43 is sandwiched between the first tongue portion 4113 of the upper insulator 411 and the second tongue portion 4213 of the lower insulator 421 . The middle shielding sheet 43 includes a base plate 431 and two welding feet 432 bent backward from two sides of the base plate 431 and extending from two second tongue portions 4113 , 4213 . The middle shielding sheet 43 is located between the upper row of terminals 412 and the lower row of terminals 422 , which can effectively reduce the crosstalk between the upper row of terminals 412 and the lower row of terminals 422 during high frequency transmission. The soldering legs 432 and the soldering legs 4222 of the lower row of terminals 422 are distributed on the same soldering plane and aligned laterally. This structure is beneficial to make the electrical connector 10 have a more compact structure.

Referring to FIG. 6 and FIG. 8 , the rear portion of the composite insulating body 44 is formed with a flange 441 fitted behind the step 38 on the insulating shell 3 . The first grooves 413 , 423 are concavely formed on the outer peripheral surface of the flange 441 . In this embodiment, the first grooves 413 , 423 extend along the front-to-back direction, and extend forward to the step 38 , so that the sealant 6 can penetrate to the step 38 to obtain a better sealing effect. The rear end of the insulating shell 3 extends backward compared to the rear end of the composite insulating body 44 , so that the rear portion of the insulating shell 3 and the rear end of the composite insulating body 44 enclose a receiving groove 7 . The composite module 4 is inserted into the cavity 19 from back to front until the front end face of the flange 441 abuts against the vertical face of the step 38 and is installed in place. This structure can improve waterproofing. sealing effect.

Referring to FIG. 6 and FIG. 8 , the inner shielding shell 5 is preferably composed of two shielding sheets 51 respectively located on the upper and lower sides of the composite insulating body 44 . Two sides of each shielding piece 51 are vertically bent to extend a fixing tab 517 , and the two fixing tabs 517 are correspondingly snapped into the two fastening holes 447 of the composite insulating body 44 . This clamping structure is convenient for assembly, and can securely install the two shielding pieces 51 on the composite insulating body 44 . In addition, the inner shielding shell 5 and the outer shielding shell 1 can be fixedly combined by laser welding, thereby improving the grounding effect of the inner shielding shell 5 .

Referring to FIG. 4 to FIG. 9 , the sealant 6 is disposed at the rear end of the composite insulating body 44 . The sealant 6 is specifically applied on the receiving groove 7 and solidified to form an integral sealing unit. The sealant 6 includes a base portion 61 fully enclosed in the rear end of the composite insulating body 44, located in the receiving groove 7, and a first extension portion 63 extending forward from the base plate 61 into the first grooves 413, 423 and formed by The base portion 61 extends forward into the second extension portion 64 of the second groove 444 . It is worth mentioning that, depending on the structure of the composite module 4 itself and the cooperation between the composite module 4 and the insulating casing 3, the sealant 6 may also include other extensions extending forward from the base 61, For example: the portion extending into the gap between the outer peripheral edge of the composite insulating body 44 and the inner edge of the insulating shell 3 , and for example: the portion extending into the gap between the bottom surface of the upper insulator 411 and the top surface of the lower insulator 421 .

The assembly process of the electrical connector 10 of the present utility model generally includes: welding the outer shielding shell 1 and the fixing element 2 together; injecting molten plastic on the outer periphery of the outer shielding shell 1 and the fixing element 2 to overmold the insulating shell 3 ; The intermediate shielding sheet 43 is sandwiched between the upper row of terminal modules 41 and the lower row of terminal modules 42; the upper row of terminal modules 41 and the lower row of terminal modules 42 are fixed together by ultrasonic welding, thereby Obtain the composite module 4; install two shielding sheets 51 on the upper and lower sides of the composite module 4 to form an inner shielding shell 5; then install the composite module 4 with the inner shielding shell 5 from the rear Insert it into the cavity 19 forward, so that the two positioning feet 14 of the outer shielding shell 1 are correspondingly inserted into the positioning slot 416; finally, a layer of sealant 6 is provided at the receiving slot 7, so as to seal the insulating shell 3 as a whole rear opening.

Compared with the prior art, the utility model inserts the fixing element 2 and the outer shielding shell 1 into the insulating shell 3, and then inserts the composite module 4 into the cavity of the outer shielding shell 1 from back to front 19, and a plurality of first grooves 413, 423 are formed between the rear end of the composite insulating body 44 and the insulating shell 3, and then the sealant 6 is arranged on the rear end of the composite insulating body 44, and the sealant 6 can be Through these first grooves 413, 423, it penetrates forward between the composite insulating body 44 and the insulating casing 3, so that the sealant 6 can be firmly bonded to the insulating casing 3, and fully seal the rear of the composite module 4 gap, thereby effectively preventing external water droplets from penetrating backward into the electronic device through the gap inside the electrical connector 10 .

Referring to FIG. 11 to FIG. 16 , it is an electrical connector 10 a of another preferred embodiment of the electrical connector of the present invention. The electrical connector 10a of this embodiment is substantially the same as the electrical connector 10 in the previous embodiments. The difference between the electrical connector 10a of this embodiment and the electrical connector 10 in the preceding embodiments is mainly reflected in that the composite module 4a is specifically composed of an upper row terminal module 41a, a lower row terminal module 42a and an intermediate module. Group 46a is combined. The upper row of terminal modules 41a and the lower row of terminal modules 42a are installed on the upper and lower sides of the middle module 46a respectively. The upper-row terminal module 41a includes an upper insulator 411a and a set of upper-row terminals 412a embedded in the upper insulator 411a. Similarly, the lower-row terminal module 42a includes a lower insulator 421a and a set of lower-row terminals 422a embedded in the lower insulator 421a. The intermediate module 46a includes a main insulator 461a and an intermediate shield 43a buried on the main insulator 461a. Wherein, the composite insulating body 44a is composed of the main insulator 461a, the upper insulator 411a and the lower insulator 421a.

Specifically, the main insulator 461a includes a base 4611a and a tongue 4612a extending forward from the base 4611a. A positioning groove 467a is formed on both sides of the front surface of the base portion 4611a. The outer peripheral edge of the base portion 4611a is also formed with a first groove 4615a. A receiving space 4613a is provided behind the base 4611a. The upper insulator 411a and the lower insulator 421a are correspondingly received in the receiving space 4613a. The intermediate shielding sheet 43a is buried on the main insulator 461a and extends to the tongue plate 4612a. Both upper and lower sides of the tongue plate 4612a are provided with terminal receiving grooves 4614a for correspondingly receiving the upper row of terminals 412a and the lower row of terminals 422a. The tongue plate 4612a is an integral structure with an intermediate shielding sheet 43a embedded therein, and its strength is better and less likely to be damaged. The rear end of the composite module 4a is also coated with sealant 6a, which penetrates forward into the first groove 4615a and fully seals the gap at the rear of the composite module 4a.

The above content is only a preferred embodiment of the utility model, and is not intended to limit the implementation of the utility model. Those skilled in the art can easily make corresponding modifications or modifications according to the main idea and spirit of the utility model. Therefore, the protection scope of the present utility model should be based on the protection scope required by the claims.

Claims (10)

1. An electrical connector, comprising an outer shielding shell formed with a cavity extending back and forth, a fixing element fixed on the outside of the outer shielding shell, a composite module inserted in the cavity and surrounded by the outer shielding shell Shielding shell and an insulating shell on the outer periphery of the composite module; the fixing element includes a top plate and at least one grounding fixing foot extending from the top plate, and the at least one grounding fixing foot protrudes outward from the insulating shell; it is characterized in that The top plate of the fixing element is fixed together with the outer shielding shell, the outer shielding shell and the fixing element are insert-molded in the insulating shell, and the composite module is inserted into the outer shell from the rear of the insulating shell In the cavity of the shielding case; the composite module includes a composite insulating body and a set of upper row terminals, a group of lower row terminals and a middle row between the upper row terminals and the lower row terminals arranged on the composite insulating body A shielding sheet, wherein at least one first groove is formed between the rear end of the composite insulating body and the insulating shell; a layer of sealant is arranged on the rear of the composite insulating body, and the sealant is arranged along the at least one first groove It penetrates forward between the composite insulating body and the insulating shell, and fully seals the rear part of the composite insulating body. 2. The electrical connector according to claim 1, wherein a step is formed on the rear portion of the insulating shell, and a flange is formed on the rear portion of the composite insulating body to fit behind the step, the At least one first groove is recessed and formed on the outer peripheral surface of the flange. 3. The electrical connector according to claim 2, wherein the at least one first groove extends along the front-rear direction and extends forward to the step. 4. The electrical connector according to claim 2, characterized in that, the front surfaces of the composite insulating body on both sides of the flange are recessed backward to form a positioning groove; the two sides of the outer shielding shell are respectively backward A positioning pin is extended, and the two positioning pins are correspondingly inserted into the two positioning slots backward. 5. The electrical connector according to claim 1, wherein the insulating shell encloses a receiving groove at the rear end of the composite insulating body, and the sealant is filled in the receiving groove. 6. The electrical connector according to claim 1, wherein the outer shielding shell comprises a bottom wall, two side walls respectively bent and extended upwards from both sides of the bottom wall, and the two side walls A top wall formed by bending the top end and then extending towards each other, the top wall has a pair of seams, the cavity is surrounded by the bottom wall, two side walls and the top wall; the fixing element The top plate is welded and fixed on both sides of the butt joint of the top wall. 7. The electrical connector according to claim 1, wherein the intermediate shielding piece comprises a base plate and at least one first welding leg extending backward from the base plate out of the composite insulating body; each lower row of terminals has A second welding leg of the composite insulating body extends backward, wherein the first welding legs and the second welding legs are distributed on the same welding plane and aligned laterally. 8. The electrical connector according to claim 1, wherein the electrical connector further comprises an inner shielding shell arranged on the outer periphery of the composite insulating body and inside the outer shielding shell, the inner shielding shell is composed of Two shielding sheets located on the upper and lower sides of the composite insulating body are combined, and a fixed tab extends vertically from both sides of each shielding sheet; each side of the composite insulating body is formed with a vertically penetrating and closed The fastening holes of the two shielding sheets are correspondingly fastened into the two fastening holes. 9. The electrical connector according to any one of claims 1 to 8, wherein the composite insulating body is composed of an upper insulator and a lower insulator, the group of upper terminals is embedded in the upper insulator, the A set of lower row terminals is buried in the lower insulator, the upper insulator and the lower insulator respectively extend forward with a first tongue part and a second tongue part, and the middle shielding piece is sandwiched by the first tongue part of the upper insulator. between the tongue part and the second tongue part of the lower insulator; the at least one first groove has a plurality of grooves, which are respectively formed on the outer peripheral edges of the rear part of the upper insulator and the lower insulator; the upper insulator and the lower insulator At least one second groove is also formed therebetween, and the sealant also penetrates forwardly along the at least one second groove between the upper insulator and the lower insulator. 10. The electrical connector according to any one of claims 1 to 8, wherein the composite insulating body is composed of a main insulator, an upper insulator and a lower insulator, and the group of upper terminals is embedded in the upper insulator. In the insulator, the group of lower row terminals is buried in the lower insulator; the main insulator extends forward with an integral tongue plate, the middle shielding piece is embedded in the tongue plate of the main insulator, the group of upper row terminals and the The lower row of terminals are respectively exposed on the upper and lower sides of the tongue plate; there are multiple at least one first grooves, which are respectively formed on the outer peripheral edge of the upper insulator, the lower insulator and the rear part of the main insulator; the upper insulator and the At least one second groove is formed between the lower insulators, and the sealant penetrates forwardly along the at least one second groove between the upper insulator and the lower insulator.