阅读说明：本技术 充电用电连接器 (Electric connector for charging ) 是由 李儒平 于 2021-08-30 设计创作，主要内容包括：本发明关于一种充电用电连接器,主要是在一连接器基座内同轴地设有一第一导电端子和一第二导电端子,该第一导电端子、第二导电端子间设有一绝缘座,该绝缘座表面同轴形成有一起伏构造,该起伏构造包含一个以上的沟槽和一个以上的台阶,利用该凹入于绝缘座表面的沟槽或高于绝缘座表面的台阶,以大幅地增加该第一导电端子沿绝缘座表面到第二导电端子的绝缘表面,从而延长了第一导电端子到第二导电端子沿着该绝缘表面所形成的爬电距离,同时亦扩大了散热面积。(The invention relates to an electric connector for charging, which is mainly characterized in that a first conductive terminal and a second conductive terminal are coaxially arranged in a connector base, an insulating seat is arranged between the first conductive terminal and the second conductive terminal, a corrugated structure is coaxially formed on the surface of the insulating seat, the corrugated structure comprises more than one groove and more than one step, and the groove recessed in the surface of the insulating seat or the step higher than the surface of the insulating seat is utilized to greatly increase the creepage distance from the first conductive terminal to the second conductive terminal along the surface of the insulating seat, thereby simultaneously enlarging the heat dissipation area.)

1. A charging electric connector is characterized in that a first conductive terminal and a second conductive terminal are coaxially arranged in a connector base, and an insulating seat is arranged between the first conductive terminal and the second conductive terminal; wherein:

one end of the first conductive terminal is arranged in the connector base, and the other end of the first conductive terminal is exposed out of the connector base; the first conductive terminal is hollow and cylindrical, and an upper slot chamber and a lower slot chamber are arranged in the first conductive terminal;

the insulating seat is arranged in the lower groove chamber of the first conductive terminal in a shape matching manner; the surface of the insulating seat is coaxially formed with a relief structure, and the relief structure comprises more than one annular groove lower than the surface of the insulating seat and more than one annular step higher than the surface of the insulating seat;

the second conductive terminal is arranged at the center of the insulating seat and is coaxially and electrically isolated in the first conductive terminal, one end of the second conductive terminal is positioned in the upper groove chamber of the first conductive terminal, and the other end of the second conductive terminal penetrates out of the bottom of the insulating seat.

2. The electrical charging connector of claim 1, wherein the undulated groove is located at a periphery of the step.

3. The electrical charging connector of claim 1, wherein the depth of the groove of the relief structure is greater than one-half the thickness of the insulating base.

4. The electrical connector for charging of claim 1, wherein the step of the undulation structure protrudes above the surface of the insulating base and is higher than the bottom of the upper chamber of the first conductive terminal.

5. The electrical charging connector according to claim 1, wherein the undulation has a step outer diameter equal to an inner diameter of the groove, and an outer diameter wall of the step is formed by extending upward an inner groove wall of the groove.

6. The electrical charging connector of claim 2, wherein the relief structure comprises a second groove, the second groove being located inside the step.

7. The electrical connector as claimed in claim 1, wherein the second conductive terminal is in the shape of a long and narrow hollow tube, and has an upper hole and a lower hole connected to each other, and the hole diameter of the upper hole is larger than that of the lower hole;

the second conductive terminal is provided with an elastic contact element and a contact spring in an upper pore passage, the contact spring is positioned at the lower end of the upper pore passage, and the elastic contact element is positioned at the upper end of the upper pore passage and above the contact spring;

the elastic contact element is in a crown spring form and comprises an upper ring, a lower ring and a plurality of contact reeds, two ends of each contact reed are respectively connected with the upper ring and the lower ring, each contact reed extends towards the axial center direction of the upper ring and the lower ring to respectively form a contact point, and the distance between the contact point of each contact reed and the lower ring is greater than the distance between the contact point and the upper ring.

8. The electrical charging connector according to claim 7, wherein the contact spring has a constricted portion at an upper end thereof, the constricted portion having an outer diameter smaller than an inner diameter of a lower ring of the elastic contact piece and larger than an inner diameter of the elastic contact piece at a contact point thereof, the constricted portion being located below the contact point of the elastic contact piece;

the lower hole channel of the second conductive terminal is a screw hole;

the lower end of the contact spring is provided with a dense turn part with dense turns, the lower end of the dense turn part of the contact spring is penetrated with a stud, and the stud is screwed in a lower pore passage of the second conductive terminal.

9. The electric connector for charging according to any one of claims 1 to 6, wherein the bottom of the connector base is provided with a first electric contact piece and a second electric contact piece, respectively, and one end of the first electric contact piece and one end of the second electric contact piece are fixed to the bottom of the first conductive terminal and the bottom of the second conductive terminal respectively and form an electric connection; the other ends of the first electric connecting piece and the second electric connecting piece extend out of the bottom of the connector base along the vertical direction and are respectively positioned at two opposite sides of the bottom of the connector base;

the bottom of the connector base is provided with a partition wall protruding out of the bottom surface of the connector base, and the partition wall is transversely arranged between the first electric connecting piece and the second electric connecting piece.

10. The electrical connector for charging as claimed in claim 9, wherein the partition wall has a width greater than the widths of the first and second electrical contacts.

Technical Field

The present invention relates to an electrical connector, and more particularly, to an electrical connector for charging, which has an insulation seat with a raised structure higher or lower than the surface thereof to increase a creepage distance.

Background

In recent years, electric vehicles have been one of the most popular industries in view of environmental protection and alternative energy, and because electric vehicles rely on charging to maintain endurance, in the case of electric motorcycles, the battery is usually replaced to obtain endurance, and the battery and the vehicle end are connected by a connector in a pluggable manner, and because the connector is used as a power transmission interface, the electrical specification of the electric vehicles must meet the requirements of specific standards.

According to the Chinese national standard GB 24155-:

the creepage distance d1 between the power storage battery connection terminals is calculated according to the following formula (1) and has a unit of mm:

d1≥0.25U+5 (1)

the creepage distance d2 between the charging member and the level block is calculated in mm by the following equation (2):

d2≥0.125U+5 (2)

u in the above formulas (1) and (2) is the maximum operating voltage between the two output terminals of the power storage battery, and the unit is volt.

The electrical gap between the conductive parts should be no less than 2.5 mm.

Referring to fig. 7, the method for measuring the electrical gap and the creepage distance is disclosed, in which two connection terminals 71 and 72 on a carrier 70 are disclosed, the two connection terminals 71 and 72 respectively have a conductive surface 710 and 720, the distance between the conductive surfaces 710 and 720 is the electrical gap G, and the distance between the two connection terminals 71 and 72 along the surface of the carrier 70 is the creepage distance D.

As mentioned above, China has the above requirements for creepage distance and electric clearance for the charging interface of electric vehicles. As shown in fig. 8 and 9, a conventional electrical connector for charging is disclosed, wherein a negative conductive terminal 81 is disposed in a connector housing 80, a positive conductive terminal 82 is disposed in the negative conductive terminal 81 coaxially and electrically isolated from the negative conductive terminal, the negative conductive terminal 81 is hollow and cylindrical, and has an upper chamber 811 and a lower chamber 812 communicating with each other, wherein the inner diameter of the upper chamber 811 is larger than that of the lower chamber 812, a crown spring 813 is disposed in the upper chamber 811, the crown spring 813 is electrically connected to the negative conductive terminal 81, and the crown spring 813 has a plurality of contact springs, each contact spring extends in an axial direction to form a contact point, and when the connector is engaged with a corresponding connector, the crown spring 813 is a main conductive medium of a negative power supply, and the contact point is a conductive surface of the negative conductive terminal 81.

In order to realize that the cathode conductive terminal 81 is coaxially and electrically isolated from the anode conductive terminal 82 in the interior thereof, an insulating seat 83 is arranged in the lower groove chamber 812 in a shape matching manner, the anode conductive terminal 82 is arranged at the center of the insulating seat 83, and an insulating surface is provided between the anode conductive terminal 82 and the cathode conductive terminal 81 through the arrangement of the insulating seat 83, so that the anode conductive terminal 82 and the cathode conductive terminal 81 form electrical isolation. According to the requirements of the above-mentioned national standard, the working voltage of this type of connector is 50.4 volts, and the creepage distance must be greater than or equal to 17.6mm (0.25x50.4+5) and the electrical clearance must be greater than 2.5mm as calculated according to the above formula (1).

Corresponding to the above connector, it means that the creepage distance from the negative conductive terminal 81 to the positive conductive terminal 82 along the surface of the insulating seat 83 must be greater than 17.6mm, and the contact point of the crown spring 813 serves as the conductive surface of the negative conductive terminal 81, and the electrical clearance between the contact point and the positive conductive terminal 82 must be greater than 2.5 mm. As shown in fig. 10, the actual measurement result shows that the electrical gap G1 between the contact point of the crown spring 813 and the positive conductive terminal 82 of the negative conductive terminal 81 is 6.02mm, which is constantly greater than 2.5mm of the standard requirement, so that it meets the safety requirement. But the creepage distance from the negative conductive terminal 81 to the positive conductive terminal 82 along the surface of the insulating seat 83Is only 7.33mm and is far below the 17.6mm required by the standard and does not meet the specification.

In the aspect of external connection, the connector also faces the problem that the creepage distance does not meet the safety requirement, as shown in fig. 9, the negative conductive terminal 81 and the positive conductive terminal 82 are respectively connected with an electrical connection sheet 84, 85, one end of the two electrical connection sheets 84, 85 is respectively electrically connected with the bottom of the negative conductive terminal 81 and the bottom of the positive conductive terminal 82, the other end is bent and extended beyond the bottom of the connector base 80, and the other end extending out of the connector base 80 is bent and substantially parallel to the bottom surface of the connector base 80 to form an electrical connection portion 840, 850 for external electrical connection.

Referring to fig. 9 and 11, the other ends of the two electrical connection sheets 84 and 85 exposed outside the connector base 80 are located at two opposite positions of the bottom of the connector base 80, and under the limitation of the structure of the connector base 80, the distance between the two electrical connection sheets 84 and 85 is lengthened as much as possible, and according to the requirement that the distance D1 between the two electrical connection sheets 84 and 85 is measured to be 17.15mm, which is much larger than the requirement that the electrical gap must be greater than or equal to 2.5mm, the creepage distance is still lower than the requirement of at least 17.6 mm.

As described above, the conventional charging connector cannot meet the safety requirement in terms of creepage distance, and therefore, further discussion is needed and a feasible solution is sought.

Disclosure of Invention

Accordingly, the present invention is directed to an electrical connector for charging, which has a special undulation structure formed on an insulating base between terminals to increase a creepage distance and a heat dissipation area, thereby meeting safety requirements.

The main technical means adopted for achieving the purpose is that the electric connector for charging comprises a connector base, a first conductive terminal and a second conductive terminal are coaxially arranged in the connector base, and an insulating seat is arranged between the first conductive terminal and the second conductive terminal; wherein:

one end of the first conductive terminal is arranged in the connector base, and the other end of the first conductive terminal is exposed out of the connector base; the first conductive terminal is hollow and cylindrical, and an upper slot chamber and a lower slot chamber are arranged in the first conductive terminal;

the insulating seat is arranged in the lower groove chamber of the first conductive terminal in a shape matching manner; the surface of the insulating seat is coaxially formed with a relief structure, and the relief structure comprises more than one groove lower than the surface of the insulating seat and more than one step higher than the surface of the insulating seat;

the second conductive terminal is arranged at the center of the insulating seat and is coaxially and electrically isolated in the first conductive terminal, one end of the second conductive terminal is positioned in the upper groove chamber of the first conductive terminal, and the other end of the second conductive terminal penetrates out of the bottom of the insulating seat.

The surface of the insulating seat of the connector is coaxially formed with an annular undulation structure, and the undulation structure is used for protruding and recessing on the surface of the insulating seat, so that the creepage distance from the first conductive terminal to the second conductive terminal along the surface of the insulating seat can be greatly prolonged, the heat dissipation area can be expanded, and the safety requirement can be fully met.

Drawings

Fig. 1 is a perspective sectional view of a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of a preferred embodiment of the present invention.

FIG. 3 is an enlarged partial cross-sectional view of a preferred embodiment of the present invention.

Fig. 4 is a bottom perspective view of a preferred embodiment of the present invention.

FIG. 5 is a further enlarged partial cross-sectional view of a preferred embodiment of the present invention.

Fig. 6 is a bottom perspective view of a preferred embodiment of the present invention.

Fig. 7 is a schematic diagram illustrating calculation of the creepage distance.

Fig. 8 is a perspective view of a conventional charging electrical connector.

Fig. 9 is a sectional view of a conventional charging electrical connector.

Fig. 10 is a partially enlarged sectional view of a conventional charging electrical connector.

Fig. 11 is a bottom view of a conventional charging electrical connector.

Detailed Description

The technical means adopted by the invention to achieve the predetermined object of the invention are further described below with reference to the drawings and the preferred embodiments of the invention.

Referring to fig. 1 and 2, a first conductive terminal 20 is disposed in a connector base 10, and a second conductive terminal 30 is disposed in the first conductive terminal 20 coaxially and electrically isolated from the first conductive terminal 20; in practical application, the first conductive terminal 20 can be used as a negative terminal, and the second conductive terminal 30 can be used as a positive terminal, but not limited thereto, and the polarities of the two connected power supplies can be interchanged according to practical requirements; wherein

The connector base 10 is hollow, and mainly forms a ring-shaped plateau 11 extending in the vertical direction coaxially on a circular base, and the plateau 11 is combined with one end of the first conductive terminal 20 in a shape matching manner.

The first conductive terminal 20 is hollow and cylindrical, and one end thereof is located in the plateau 11 of the connector base 10, and the other end thereof penetrates out of the plateau 11. The first conductive terminal 20 is formed with an upper chamber 21 and a lower chamber 22 communicating with each other, the inner diameter of the upper chamber 21 is larger than that of the lower chamber 22, the lower chamber 22 is further formed with an inner contracting wall 220, mainly the lower chamber 22 is contracted by the wall to relatively expand the inner diameter of the lower chamber 22.

An insulating base 40 is disposed in the lower slot chamber 22 of the first conductive terminal 20 in a shape-matching manner, the insulating base 40 is made of an insulating material and has a surface exposed at the bottom of the upper slot chamber 21, and the surface of the insulating base 40 is coaxially formed with a relief structure, which includes at least one annular groove 41 lower than the surface of the insulating base 40 and at least one annular step 42 higher than the surface of the insulating base 40.

In the present embodiment, the trench 41 is located at the periphery of the step 42, that is, the inner diameter of the trench 41 is greater than or equal to the outer diameter of the step 42 and is close to the first conductive terminal 20, and the step 42 is close to the second conductive terminal 30; moreover, the depth of the trench 41 is constantly greater than one-half of the thickness of the insulating base 40, and more specifically, the depth of the trench 41 is deepened as much as possible on the premise of meeting the strength and specification. The step 42 is higher than the bottom of the upper chamber 21 of the first conductive terminal 20 except the surface protruding from the insulating base 40. in this embodiment, the outer diameter of the step 42 is equal to the inner diameter of the groove 41, so that the outer diameter wall of the step 42 is directly formed by extending the inner wall of the groove 41 upward.

In view of the above, in a preferred embodiment of the present invention, an undulation structure is coaxially formed on the surface of the insulating base 40 between the first conductive terminal 20 and the second conductive terminal 30, the undulation structure includes a groove 41 and a step 42, and the surface of the insulating base 40 is made to be in an undulated state by the groove 41 and the step 42, so that the insulating surface of the insulating base 40 between the first conductive terminal 20 and the second conductive terminal 30 is greatly increased, thereby the creepage distance between the first conductive terminal 20 and the second conductive terminal 30 is extended and meets the requirement of the specific standard.

Furthermore, the present invention makes the lower slot chamber 22 of the first conductive terminal 20 form the inner slot wall 220 to enlarge the inner diameter and enlarge the outer diameter of the insulating base 40 relatively, so as to extend the creepage distance between the first conductive terminal 20 and the second conductive terminal 30 in the horizontal direction, and further means that the undulation structure of the surface of the insulating member 40 can form more grooves or steps, as shown in fig. 3, the undulation structure of the surface of the insulating base 40 further includes a second groove 43, the second groove 43 is located inside the step 42, the second groove 43 is lower than the surface of the insulating base 40 but higher than the groove 41, thereby, the creepage distance from the first conductive terminal 20 to the second conductive terminal 30 along the surface of the insulating base 40 is equal toThe creepage distance can reach 18.06mm through specific actual measurement, and the safety requirement of being larger than 17.6mm is met.

The upper slot chamber 21 of the first conductive terminal 20 is electrically connected with a crown spring 23, the crown spring 23 has a plurality of contact reeds, each contact reed extends towards an axial center direction of the first conductive terminal 20 to form a contact point 230, and an electrical gap between the first conductive terminal 20 and the second conductive terminal 30 is a distance between the contact point 230 of the crown spring 23 and the second conductive terminal 30, which is constantly larger than 2.5mm of the safety requirement specification.

Referring to fig. 1 and 2, a first electric connecting piece 200 and a second electric connecting piece 300 are respectively disposed at the bottom of the connector base 10, one end of the first electric connecting piece 200 is fixed at the bottom of the first conductive terminal 20 to form an electric connection, the other end of the first electric connecting piece 200 extends out of the bottom of the connector base 10 along the vertical direction and is bent towards the horizontal direction to form a first electric connecting portion 201, one end of the second electric connecting piece 300 is fixed at the bottom of the second conductive terminal 30 to form an electric connection, the other end of the second electric connecting piece 300 also extends out of the bottom of the connector base 10 along the vertical direction and is bent towards the horizontal direction to form a second electric connecting portion 301, the first electric connecting piece 200 and the second electric connecting piece 300 are respectively located at two opposite sides of the bottom of the connector base 10, i.e. two ends of the diameter distance of the connector base 10, in order to ensure that the creepage distance between the first electric connecting piece 200 and the second electric connecting piece 300 along the bottom of the connector base 10 meets the safety requirement, the bottom of the connector base 10 is provided with a partition wall 12 protruding from the bottom surface, the partition wall 12 is transversely arranged between the first electric connecting piece 200 and the second electric connecting piece 300, and more specifically, the width of the partition wall 12 is constantly larger than the widths of the first electric connecting piece 200 and the second electric connecting piece 300.

In the aforementioned situation, as shown in FIG. 5, the creepage distance from the first electric contact 200 to the second electric contact 300 along the bottom surface of the connector housing 10 is significantly extended by the presence of the partition wall 12.

Referring to fig. 3, the second conductive terminal 30 is in a shape of a long and narrow hollow tube, and an upper hole 31 and a lower hole 32 are formed inside the second conductive terminal 30 and are connected to each other, wherein the hole diameter of the upper hole 31 is larger than that of the lower hole 32, and the lower hole 32 is a screw hole. The second conductive terminal 30 has an elastic contact member 33 and a contact spring 34 disposed in the upper hole 31, the contact spring 34 is located at the lower end of the upper hole 31, the elastic contact member 33 is in the form of a crown spring and is located at the upper end of the upper hole 31 and above the contact spring 34.

Referring to fig. 6, the elastic contact 33 includes an upper ring 331, a lower ring 332, and a plurality of contact springs 333 having two ends respectively connected to the upper ring 331 and the lower ring 332, each contact spring 333 extends toward an axial center of the upper ring 331 and the lower ring 332 to form a contact point, in this embodiment, a distance between the contact point of each contact spring 333 and the lower ring 332 is greater than a distance between the contact point and the upper ring 331, and compared with a conventional crown spring, the length (arm) of the contact spring 333 is increased by the elastic contact 33, so as to prolong the service life of the elastic contact 33.

The upper end of the contact spring 34 has a constricted portion 341, and the outer diameter of the constricted portion 341 is smaller than the inner diameter of the lower ring 332 of the elastic contact 33 and larger than the inner diameter of the elastic contact 33 at the contact point thereof, so that the constricted portion 341 is located below the contact point of the elastic contact 33. As shown in fig. 3, the contact spring 34 has a dense-turn portion 342 with dense turns at a lower end thereof, and the contact spring 34 is provided with a stud 35 at the lower end of the dense-turn portion 342, and the stud 35 is screwed into the lower hole 32 of the second conductive terminal 30, thereby fixing the contact spring 34 in the upper hole 31 of the second conductive terminal 30.

In summary, the present invention is mainly to provide an insulating base between a first conductive terminal and a second conductive terminal in a connector base, wherein a relief structure is coaxially formed on a surface of the insulating base, the relief structure includes at least one groove recessed into the surface of the insulating base and at least one step higher than the surface of the insulating base, so that the first conductive terminal can be extended to the insulating surface of the second conductive terminal along the surface of the insulating base, thereby extending a creepage distance formed by the first conductive terminal to the second conductive terminal along the insulating surface, and simultaneously expanding a heat dissipation area to meet a safety requirement. Moreover, the first conductive terminal and the second conductive terminal are respectively connected with the first electric connecting sheet and the second electric connecting sheet which penetrate out of the bottom of the connector base, a partition wall protruding out of the bottom surface of the connector base is arranged at the bottom of the connector base, the partition wall is utilized to prolong the creepage distance from the first electric connecting sheet to the second electric connecting sheet along the bottom surface of the connector base, and the creepage distance between the first electric connecting sheet and the second electric connecting sheet can also meet the safety requirement of a specific standard.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.