Patent Publication Number: US-2018040974-A1

Title: Electrical connector

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This non-provisional application claims priority to and the benefit of, pursuant to 35 U.S.C. §119(a), Patent Application Serial No. CN201620829843.7 filed in P.R. China on Aug. 3, 2016, the entire content of which is hereby incorporated by reference. 
     FIELD OF THE INVENTION 
     The present invention relates to an electrical connector, and more particularly to an electrical connector with a waterproof function. 
     BACKGROUND OF THE INVENTION 
     The universal serial bus (USB for short) electrical connector is used widely by the public. With the development of electronic products, the transmission speed of the USB electrical connector is becoming higher and higher, while user requirement on the quality of this type of electrical connector is stricter. This type of electrical connector is generally used for mounting on an electronic device, which has an insertion hole for the insertion of an external plug. As a result, the electrical connector may easily contact water to cause short-circuiting, or may be damped and damaged by moisture. Furthermore, moisture can easily infiltrate into the electronic device via the slot to affect circuit boards or other electronic elements in the electronic device, thus reducing the performance of the electronic devices. Industry practitioners may mount a “waterproof plug” on the electrical connector, or mount a “waterproof washer” therein to prevent from the moisture. However, both the waterproof plug and the waterproof washer result in assembly difficulties and high cost. In order to solve these problems, those skilled in the art design a waterproof connector. The waterproof connector includes an insulating body, which is concavely provided with a groove. A first terminal group and a second terminal group are accommodated in the insulating body. The first terminal group is provided with a first soldering portion that passes through a bottom surface of the insulating body, and the second terminal group is provided with a second soldering portion that runs through the bottom surface of the insulating body. In order to prevent crosstalk, a large partitioning area is arranged between the second soldering portion and the first soldering portion. A metal shell wraps a periphery of the insulating body, and the metal shell is provided with multiple guide inlets corresponding to the groove. A first glue dispensing is carried out in the guide inlets, so that glue flows into the groove via the guide inlets to seal the gap between the insulating body and the metal shell. Then, a second glue dispensing is carried out on the bottom surface of the insulating body to seal the first soldering portion and the second soldering portion. 
     However, the metal shell is provided with the multiple guide inlets, and glue dispensing needs to be carried out for each of the guide inlets. As a result, the glue dispensing processes may be complex, and the usage of glue cannot be accurately controlled. If too much glue is dispensed, the glue can easily overflow to cause waste. If the glue is under-dispensed, sealing may be incomplete and thus resulting in poor sealing. Furthermore, since the partitioning area is arranged between the first soldering portion and the second soldering portion, the glue will flow to the partitioning area when glue is dispensed on the bottom surface of the insulating body. Thus, the glue is also filled in the partitioning area while sealing the first soldering portion and the second soldering portion. As a result, the usage of the glue is increased to cause waste, thereby increasing the manufacturing cost of the electrical connector. 
     Therefore, a heretofore unaddressed need to design an improved electrical connector exists in the art to address the aforementioned deficiencies and inadequacies. 
     SUMMARY OF THE INVENTION 
     In view of the above problems in the background, one aspect of the present invention is directed to an electrical connector, which is simple in the manufacturing process and saves cost. 
     To achieve the foregoing objective, one aspect of the invention provides an electrical connector, which includes an insulating body, concavely provided with a groove, a first filling groove communicating with the groove, and a second filling groove spaced from the first filling groove; a plurality of first terminals and a plurality of second terminals, accommodated in the insulating body, wherein each of the first terminals has a first connecting portion located partially in the first filling groove, and each of the second terminals has a second connecting portion located partially in the second filling groove; a metal shell, wrapping a periphery of the insulating body, wherein the groove is located between the insulating body and the metal shell; a first sealing member, filled in the first filling groove and extending to fill in the groove; and a second sealing member, filled in the second filling groove. 
     In certain embodiments, each of the first filling groove and the second filling groove is concavely formed on a bottom surface of the insulating body, a baffle wall protrudes from a bottom of the insulating body and located between the first filling groove and the second filling groove, and a bottom surface of the baffle wall is lower than a bottom surface of the first sealing member. 
     In one embodiment, the bottom surface of the first sealing member is lower than a bottom surface of the second sealing member. 
     In certain embodiments, each of the first terminals has a first soldering portion extending from the first connecting portion and passing through a bottom surface of the insulating body, each of the second terminals has a second soldering portion extending from the second connecting portion and passing through the bottom surface of the insulating body, and the plurality of first soldering portions and the plurality of second soldering portions are arranged respectively in a front row and a back row. 
     In certain embodiments, the insulating body includes an upper insulator, a lower insulator and a plastic block; the plurality of first terminals and the lower insulator are integrally formed; the plurality of second terminals and the upper insulator are integrally formed; the upper insulator and the lower insulator are assembled and then integrally formed with the plastic block by injection molding; and the first filling groove communicates with an assembly gap between the upper insulator and the lower insulator. 
     In one embodiment, the second filling groove is a gap between the upper insulator and the plastic block. 
     In certain embodiments, a shielding sheet is clamped between the upper insulator and the lower insulator; at least one side of the shielding sheet is provided with a first retaining portion and a second retaining portion spaced from each other; the first retaining portion is formed by bending upwards and extending from the at least one side of the shielding sheet to retain a top surface of the upper insulator; and the second retaining portion is formed by bending downwards and extending from the at least one side of the shielding sheet to retain a bottom surface of the lower insulator. 
     In certain embodiments, the groove is concavely formed inwards on an external surface of the insulating body, and the groove is annular; and the first sealing member comprises a first waterproof ring formed in the groove by glue dispensing and a waterproof board is formed in the first filling groove by glue dispensing. 
     In certain embodiments, the insulating body has a base and a docking portion extending forward from the base; the groove is connected to the base and the docking portion; the base is located outside the metal shell; a slot is formed between a front end of the base and a rear end of the metal shell; and the first sealing member further comprises a second waterproof ring located between the first waterproof ring and the waterproof board, and the second waterproof ring is formed in the slot by glue dispensing. 
     In certain embodiments, the front end of the base has a front end surface, each of two opposite sides of the base has a side surface respectively, a chamfer surface is formed between the side surfaces and the front end surface and surrounds the base, and the slot is located between the chamfer surface and the rear end of the metal shell. 
     In certain embodiments, the rear end of the metal shell has a back wall, a chamfer surface is formed between the back wall and side walls of the metal shell and surrounds a periphery of the back wall, and the slot is located between the chamfer surface and the front end of the base. 
     In certain embodiments, each of the first terminals further has a first contact portion extending forward from the first connecting portion and exposed on a bottom surface of the docking portion; each of the second terminals has a second contact portion extending forward from the second connecting portion and exposed on a top surface of the docking portion; each of the plurality of first contact portions corresponds one-to-one to one of the plurality of second contact portions; and the plurality of first connecting portions and the plurality of second connecting portions are arranged in two rows and are respectively fixed on the base. 
     Compared with the art, the electrical connector according to certain embodiments of the present invention has the following beneficial effects: the insulating body is provided with the first filling groove that communicates with the groove, each first connecting portion is located partially in the first filling groove, and the first sealing member is filled in the first filling groove and extends to fill the groove. Thus, as long as glue is dispensed only in the first filling groove, the first filling groove and the groove can be filled without adding other glue dispensing inlets to dispense glue in the groove, thereby simplifying the manufacturing process. Moreover, the insulating body is concavely provided with the second filling groove that is spaced from the first filling groove, and the second sealing member is filled in the second filling groove alone to seal the second connecting portions, thus reducing the usage of glue and preventing unnecessary waste, and thereby reducing the manufacturing cost of the electrical connector. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrate one or more embodiments of the invention and together with the written description, serve to explain the principles of the invention. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment. 
         FIG. 1  is a three-dimensional exploded view of an electrical connector according to one embodiment of the present invention. 
         FIG. 2  is a schematic view of a first sealing member, a second sealing member and an insulating body of the electrical connector being disassembled according to one embodiment of the present invention. 
         FIG. 3  is a schematic view of the first sealing member and second sealing member being formed on the insulating body of the electrical connector in  FIG. 2  by glue dispensing. 
         FIG. 4  is a schematic view of  FIG. 3  from another angle. 
         FIG. 5  is a bottom view of the electrical connector according to one embodiment of the present invention. 
         FIG. 6  is a bottom view of the first sealing member and second sealing member being formed on the insulating body of the electrical connector by glue dispensing according to one embodiment of the present invention. 
         FIG. 7  is a sectional view of the electrical connector in  FIG. 5  along a line A-A. 
         FIG. 8  is an enlarged view of part H in  FIG. 7 . 
         FIG. 9  is a schematic view of the electrical connector being assembled and not provided with the first sealing member and second sealing member according to one embodiment of the present invention. 
         FIG. 10  is a sectional view of the electrical connector according to a further embodiment of the present invention. 
         FIG. 11  is an enlarged view of part I in  FIG. 10 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Various embodiments of the invention are now described in detail. Referring to the drawings, like numbers indicate like components throughout the views. As used in the description herein and throughout the claims that follow, the meaning of “a”, “an”, and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise. Moreover, titles or subtitles may be used in the specification for the convenience of a reader, which shall have no influence on the scope of the present invention. 
     It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element&#39;s relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower”, can therefore, encompasses both an orientation of “lower” and “upper,” depending of the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The exemplary terms “below” or “beneath” can, therefore, encompass both an orientation of above and below. 
     It should be noted that some of the drawings are schematic views from different angles. For example,  FIG. 2  is a schematic view of a first sealing member, a second sealing member and an insulating body of the electrical connector being disassembled according to one embodiment of the present invention, in which the electrical connector is turned over in an upside-down position. Similarly,  FIG. 3  is a schematic view of the first sealing member and second sealing member being formed on the insulating body of the electrical connector by glue dispensing according to one embodiment of the present invention, in which the electrical connector is turned over in an upside-down position. In other words, for all the components as shown in  FIG. 2  and  FIG. 3 , a “lower side” refers to the side shown on the top of the drawings in  FIG. 2  and  FIG. 3 . 
     As used herein, “around”, “about” or “approximately” shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term “around”, “about” or “approximately” can be inferred if not expressly stated. 
     As used herein, the terms “comprising”, “including”, “carrying”, “having”, “containing”, “involving”, and the like are to be understood to be open-ended, i.e., to mean including but not limited to. 
     The description will be made as to the embodiments of the present invention in conjunction with the accompanying drawings in  FIGS. 1-8 . In accordance with the purposes of this invention, as embodied and broadly described herein, this invention, in one aspect, relates to an electrical connector. 
     As shown in  FIG. 1 ,  FIG. 2  and  FIG. 3 , an electrical connector includes an insulating body  1 , a plurality of first terminals  3  and a plurality of second terminals  4  accommodated in the insulating body  1 , a shielding sheet  2  installed on the insulating body  1 , a metal shell  5  wrapping a periphery of the insulating body  1 , and a first sealing member  6  and a second sealing member  7  formed on the insulating body  1  by glue dispensing to seal a rear end of the electrical connector. The front end of the electrical connector is configured for docking with a docking connector (not shown in the drawings), and the rear end of the electrical connector is configured to be soldered onto a circuit board (not shown in the drawings). 
     As shown in  FIG. 2 ,  FIG. 5  and  FIG. 7 , the insulating body  1  has a base  11  and a docking portion  12  extending forward from the base  11 . The docking portion  12  is located in the metal shell  5 , and the base  11  is located outside the metal shell  5 . The insulating body  1  is concavely provided with a groove  13 , which is concavely formed inwards on an external surface of the insulating body  1 , and the groove  13  is annular. That is, the groove  13  surrounds a periphery of the insulating body  1 . The groove  13  is connected to the base  11  and the docking portion  12 , and the groove  13  is located between the insulating body  1  and the metal shell  5 . The insulating body  1  is further provided with a first filling groove  111  that communicates with the groove  13 . That is, the first filling groove  111  is concavely formed on the insulating body  1  near the groove  13 . The insulating body  1  is further concavely provided with a second filling groove  112  that is spaced from the first filling groove  111 , and the second filling groove  112  is strip-shaped. Each of the first filling groove  111  and the second filling groove  112  is concavely formed on a bottom surface of the insulating body  1 . That is, the first filling groove  111  communicates with a lower side (i.e., the upper side as shown in  FIG. 2 ) of the groove  13 . A baffle wall  113  is provided to protrude from a bottom of the insulating body  1 , and is located between the first filling groove  111  and the second filling groove  112 . A bottom surface of the baffle wall  113  is lower than a bottom surface of the first sealing member  6 , and the baffle wall  113  partitions the first filling groove  111  from the second filling groove  112 , so that the first filling groove  111  and the second filling groove  112  do not communicate with each other. In the present embodiment, both the first filling groove  111  and the second filling groove  112  are located on the bottom surface (i.e., the surface facing upwards as shown in  FIG. 2 ) of the base  11 . As shown in  FIG. 9 , a slot  8  is arranged between the front end of the base  11  and the rear end of the metal shell  5 , the front end of the base  11  has a front end surface (not numbered), each of the two opposite sides of the base  11  has a side surface (not numbered) respectively, and a chamfer surface  114  is formed between the side surfaces and the front end surface. The chamfer surface  114  surrounds the base  11 , and is located outside the metal shell  5 . The slot  8  is located between the chamfer surface  114  and the rear end of the metal shell  5 . 
     As shown in  FIG. 1 ,  FIG. 5  and  FIG. 7 , the insulating body  1  includes an upper insulator A, a lower insulator B, and a plastic block C. The plurality of first terminals  3  and the lower insulator B are integrally formed, and the plurality of second terminals  4  and the upper insulator A are integrally formed. The upper insulator A and the lower insulator B are assembled and then integrally formed with the plastic block C by injection molding. The first filling groove  111  communicates with an assembly gap between the upper insulator A and the lower insulator B, and the second filling groove  112  is a gap between the upper insulator A and the plastic block C. 
     As shown in  FIG. 1 ,  FIG. 4  and  FIG. 7 , the shielding sheet  2  is clamped between the upper insulator A and the lower insulator B, and is integrally formed along with the upper insulator A, the lower insulator B and the plastic block C by injection molding. At least one side of the shielding sheet  2  is provided with a first retaining portion  21  and a second retaining portion  22  spaced from each other. In the present embodiment, both sides of the shielding sheet  2  are provided with the first retaining portions  21  and the second retaining portions  22 . In other embodiments, the first retaining portion  21  and the second retaining portion  22  may be arranged on only one side of the shielding sheet  2 . Both the first retaining portions  21  and the second retaining portions  22  are integrally formed by bending and extending from the shielding sheet  2 , and the extending directions are opposite. Specifically, each first retaining portion  21  is formed by bending upwards and extending from one side of the shielding sheet  2  to retain a top surface of the upper insulator A, thereby fixing the upper insulator A; and each second retaining portion  22  is formed by bending downwards and extending from one side of the shielding sheet  2  to retain a bottom surface of the lower insulator B, thereby fixing the lower insulator B. The upper insulator A and the lower insulator B are fixed firmly by the first retaining portions  21  and the second retaining portions  22 , thereby preventing the upper insulator A and the lower insulator B from sliding relatively to affect the formation of the plastic block C. 
     As shown in  FIG. 1 ,  FIG. 3  and  FIG. 5 , each first terminal  3  is provided with a first connecting portion  32 , which is fixed on the base  11  and located partially in the first filling groove  111 . The first connecting portions  32  are arranged in a row. Each second terminal  4  is provided with a second connecting portion  42 , which is fixed on the base  11  and located partially in the second filling groove  112 . The second connecting portions  42  are arranged in another row. Each first terminal  3  further has a first contact portion  31 , which extends forward from the first connecting portion  32  and is exposed on the bottom surface of the docking portion  12 . Each second terminal  4  further has a second contact portion  41 , which extends forward from the second connecting portion  42  and is exposed on the top surface of the docking portion  12 . There are twelve first terminals  3  and twelve second terminals  4  that are respectively distributed symmetrically along the center of the docking portion  12 . The first contact portions  31  and the second contact portions  41  are correspondingly arranged one-to-one vertically, thereby ensuring that the first contact portions  31  and the second contact portions  41  of the electrical connector can be electrically connected with correct alignments with the corresponding contact portions of the docking connector, regardless of whether the docking connector is inserted upside down or not. Each first terminal  3  further has a first soldering portion  33  that extends from the first connecting portion  32  and passes through the bottom surface of the insulating body  1 , and the first soldering portions  33  are arranged in a row. Each second terminal  4  further has a second soldering portion  43  that extends from the second connecting portion  42  and passes through the bottom surface of the insulating body  1 , and the second soldering portions  43  are arranged in a row. 
     As shown in  FIG. 1 ,  FIG. 2  and  FIG. 5 , the metal shell  5  is formed by a tube, so an external wall surface of the metal shell  5  does not have any gaps and holes, thereby providing good sealing. A front end of the metal shell  5  is provided with a front wall  51 , and a rear end of the metal shell  5  is provided with a back wall  52 . Each of the front wall  51  and the back wall  52  is provided with an opening (not numbered), and the metal shell  5  has an accommodating cavity  53  connected to the two openings. The accommodating cavity  53  is used to accommodate the docking portion  12 . The base  11  is located on the back side of the back wall  52 . The back wall  52  is flush with the rear end of the groove  13 . In the present embodiment, the base  11  is provided with the chamfer surface  114 . In another embodiment, as shown in  FIG. 10  and  FIG. 11 , the base  11  is not provided with the chamfer surface  114 , and the rear end of the metal shell  5  is provided with the chamfer surface  9 . That is, a chamfer surface  9  is formed between the back wall  52  and the side walls of the metal shell  5 , the chamfer surface  9  surrounds a periphery of the back wall  52 , and the slot  8  is located between the chamfer surface  9  and the front end of the base  11 . In other embodiments, both the base  11  and the back wall  52  of the metal shell  5  are provided with the chamfer surfaces  114  and  9 , as long as it is ensured that the slot  8  is formed between the front end of the base  11  and the rear end of the metal shell  5 . 
     As shown in  FIG. 2 ,  FIG. 4  and  FIG. 6 , the first sealing member  6  is filled in the first filling groove  111  by glue dispensing, and extends to fill in the groove  13 , thus sealing the gap between the insulating body  1  and the metal shell  5  as well as the first connecting portions  32 . The second sealing member  7  is filled in the second filling groove  112  by glue dispensing to seal the second connecting portions  42 . The first sealing member  6  and the second sealing member  7  can be made of a material with a high sealing and waterproof effect, such as glue or liquid rubber. Glue is used in the present embodiment. The first sealing member  6  and the second sealing member  7  can prevent liquid substances, such as water, from infiltrating therein from the rear end of the electrical connector. Since the first sealing member  6  is filled in the first filling groove  111  by glue dispensing and extends to fill in the groove  13 , glue may be dispensed only in the first filling groove  111  to fill both the first filling groove  111  and the groove  13  without adding other glue dispensing inlets to dispense glue in the groove  13 , thereby simplifying the manufacturing process. Moreover, the insulating body  1  is concavely provided with the second filling groove  112  that is spaced from the first filling groove  111 , and the second sealing member  7  is filled in the second filling groove  112  alone to seal the second connecting portions  42 , thus reducing the usage of glue and preventing unnecessary waste, and thereby reducing the manufacturing cost of the electrical connector. Since the first filling groove  111  communicates with the assembly gap between the upper insulator A and the lower insulator B, the first sealing member  6  is filled in the assembly gap between the upper insulator A and the lower insulator B while being filled in the first filling groove  111 . Thus, moisture cannot get in the space between the upper insulator A and the lower insulator B, thereby further protecting the first terminals  3  and the second terminals  4  from the moisture. The second filling groove  112  is a gap between the upper insulator A and the plastic block C. In other words, the second sealing member  7  seals the upper insulator A and the plastic block C when being filled in the second filling groove  112 , thus enhancing the waterproof effect of the electrical connector. 
     As shown in  FIG. 2 ,  FIG. 3  and  FIG. 7 , the first sealing member  6  includes a first waterproof ring  61  formed in the groove  13  by glue dispensing and a waterproof board  63  formed in the first filling groove  111  by glue dispensing. The first waterproof ring  61  is located in the groove  13  and partially protrudes out of the groove  13  to seal the gap between the insulating body  1  and the metal shell  5 , and the waterproof board  63  is located in the first filling groove  111  to seal a space around the first connecting portions  32 . The bottom surface of the baffle wall  113  is lower than the bottom surface of the waterproof board  63 . That is, the thickness of the waterproof board  63  is less than the thickness of the baffle wall  113 , thus reducing the usage of glue under the premise of ensuring the sealing of the first connecting portions  32 , and preventing from over-dispensing too much glue that may flow beyond the baffle wall  113  to get into the second filling groove  112 , thereby further saving glue. As shown in  FIG. 8 , the first sealing member  6  also includes a second waterproof ring  62  that is located between the first waterproof ring  61  and the waterproof board  63 . The second waterproof ring  62  is formed in the slot  8 , and the diameter of the second waterproof ring  62  is greater than the diameter of the first waterproof ring  61 . The second waterproof ring  62  is connected to the first waterproof ring  61  and the waterproof board  63 . The first waterproof ring  61  is located in the metal shell  5  to seal the gap between the internal wall surface of the metal shell  5  and the external surface of the insulating body  1 . That is, the first waterproof ring  61  seals the interior of the metal shell  5 . The second waterproof ring  62  is located outside the metal shell  5  to seal an opening of the external rear end of the metal shell  5 , thus preventing moisture outside the metal shell  5  from entering the metal shell  5 . That is, the second waterproof ring  62  seals the exterior of the metal shell  5 , thereby enhancing the sealing of the electrical connector. 
     As shown in  FIG. 2 ,  FIG. 6  and  FIG. 7 , the second sealing member  7  is formed in the second filling groove  112  by glue dispensing to seal a space around the second connecting portions  42 . Since the second filling groove  112  is strip-shaped and the second connecting portions  42  are arranged in a row, the second sealing member  7  is correspondingly strip-shaped. Moreover, the bottom surface of the second sealing member  7  is far higher than the bottom surface of the insulating body  1 . That is, the thickness of the second sealing member  7  is small, thus resulting in little usage of glue for forming the second sealing member  7 , and thereby reducing the cost. 
     As shown in  FIG. 1 ,  FIG. 6  and  FIG. 7 , during assembly, the plurality of first terminals  3  and the lower insulator B are first integrally formed, and the plurality of second terminals  4  and the upper insulator A are integrally formed. Then, the upper insulator A and the lower insulator B are assembled together along a vertical direction, and the shielding sheet  2  is clamped between the upper insulator A and the lower insulator B. The first retaining portions  21  retain the top surface of the upper insulator A, so that the upper insulator A is fixed, and the second retaining portions  22  retain the bottom surface of the lower insulator B, so that the lower insulator B is fixed. The plastic block C is then formed on the peripheries of the upper insulator A and the lower insulator B by injection molding, thus forming the insulating body  1 . Finally, the metal shell  5  sleeves the periphery of the insulating body  1  with the base  11  located outside the metal shell  5 . During glue dispensing, glue is first dispensed in the first filling groove  111  for the first time, so that the glue flows to the groove  13 , the slot  8  and the assembly gap between the upper insulator A and the plastic block C while filling in the first filling groove  111 , thus forming the first sealing member  6  after the glue is solidified. Glue is then dispensed for the second time, so that the glue fills in the second filling groove  112  to form the second sealing member  7  after the glue is solidified, thereby completing the work of glue dispensing. 
     To sum up, in certain embodiments, the electrical connector of the present invention has the following beneficial effects: 
     (1) The first sealing member  6  is filled in the first filling groove  111  by glue dispensing and extends to fill in the groove  13 , thus sealing the gap between the insulating body  1  and the metal shell  5  as well as the first connecting portions  32 . The second sealing member  7  is filled in the second filling groove  112  by glue dispensing to seal the second connecting portions  42 . Thus, glue may be dispensed only in the first filling groove  111  to fill both the first filling groove  111  and the groove  13  without adding other glue dispensing inlets to dispense glue in the groove  13 , thereby simplifying the manufacturing process. Moreover, the insulating body  1  is concavely provided with the second filling groove  112  that is spaced from the first filling groove  111 , and the second sealing member  7  is filled in the second filling groove  112  alone to seal the second connecting portions  42 , thus reducing the usage of glue and preventing unnecessary waste, and thereby reducing the manufacturing cost of the electrical connector. 
     (2) The first waterproof ring  61  is located in the groove  13  and partially protrudes out of the groove  13  to seal the gap between the insulating body  1  and the metal shell  5 , and the waterproof board  63  is located in the first filling groove  111  to seal a space around the first connecting portions  32 . The bottom surface of the baffle wall  113  is lower than the bottom surface of the waterproof board  63 . That is, the thickness of the waterproof board  63  is less than the thickness of the baffle wall  113 , thus reducing the usage of glue under the premise of ensuring the sealing of the first connecting portions  32 , and preventing from over-dispensing too much glue that may flow beyond the baffle wall  113  to get into the second filling groove  112 , thereby further saving glue. 
     (3) The second waterproof ring  62  is formed in the slot  8 , and the diameter of the second waterproof ring  62  is greater than the diameter of the first waterproof ring  61 . The second waterproof ring  62  is connected to the first waterproof ring  61  and the waterproof board  63 . The first waterproof ring  61  is located in the metal shell  5  to seal the gap between the internal wall surface of the metal shell  5  and the external surface of the insulating body  1 . That is, the first waterproof ring  61  seals the interior of the metal shell  5 . The second waterproof ring  62  is located outside the metal shell  5  to seal an opening of the external rear end of the metal shell  5 , thus preventing moisture outside the metal shell  5  from entering the metal shell  5 . That is, the second waterproof ring  62  seals the exterior of the metal shell  5 , thereby enhancing the sealing of the electrical connector. 
     (4) Since the second filling groove  112  is strip-shaped and the second connecting portions  42  are arranged in a row, the second sealing member  7  is correspondingly strip-shaped. Moreover, the bottom surface of the second sealing member  7  is far higher than the bottom surface of the insulating body  1 . That is, the thickness of the second sealing member  7  is small, thus resulting in little usage of glue for forming the second sealing member  7 , and thereby reducing the cost. 
     (5) Since the first filling groove  111  communicates with the assembly gap between the upper insulator A and the lower insulator B, the first sealing member  6  is filled in the assembly gap between the upper insulator A and the lower insulator B while being filled in the first filling groove  111 . Thus, moisture cannot get in the space between the upper insulator A and the lower insulator B, thereby further protecting the first terminals  3  and the second terminals  4  from the moisture. 
     (6) The second filling groove  112  is a gap between the upper insulator A and the plastic block C. In other words, the second sealing member  7  seals the upper insulator A and the plastic block C when being filled in the second filling groove  112 , thus enhancing the waterproof effect of the electrical connector. 
     (7) Each first retaining portion  21  is formed by bending upwards and extending from one side of the shielding sheet  2  to retain a top surface of the upper insulator A, thereby fixing the upper insulator A; and each second retaining portion  22  is formed by bending downwards and extending from one side of the shielding sheet  2  to retain a bottom surface of the lower insulator B, thereby fixing the lower insulator B. The upper insulator A and the lower insulator B are fixed firmly by the first retaining portions  21  and the second retaining portions  22 , thereby preventing the upper insulator A and the lower insulator B from sliding relatively to affect the formation of the plastic block C. 
     The foregoing description of the exemplary embodiments of the invention has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. 
     The embodiments are chosen and described in order to explain the principles of the invention and their practical application so as to activate others skilled in the art to utilize the invention and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present invention pertains without departing from its spirit and scope. Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing description and the exemplary embodiments described therein.