Detachable and replaceable structure of direct current charging gun power terminal

Abstract

A detachable and replaceable structure of a power terminal of a direct current charging gun relates to a DC + power terminal and a DC-power terminal which are installed in the direct current charging gun, the DC + power terminal and the DC-power terminal are respectively composed of a plug part and a tail seat part, and the tail seat part is connected with the plug part through a thread structure. And a conical contact surface for electric conduction is arranged between the tail seat part and the plug part. During installation, the tailstock part is fixed in the charging gun, and the plug part is in threaded connection with the head end of the tailstock part through threads. When the charging gun is replaced, the ablation phenomenon occurs on the plug part, only the ablated plug part needs to be screwed off, then a new plug part is screwed on, and the charging gun does not need to be disassembled in the whole process. The conical contact surface is arranged between the tail seat part and the plug part, so that the conductive area between the tail seat part and the plug part can be greatly increased, the contact resistance is reduced, and the conductivity of the whole power terminal is improved. In addition, the power terminal is also provided with heat dissipation holes on the plug part, and the heat dissipation holes are beneficial for dissipating heat generated by the plug part, thereby reducing the temperature of the power terminal.

Description

Technical Field

[0001] The present invention relates to the field of new energy electric vehicles, and in particular to a detachable structure of a power terminal of a direct current charging gun. Background Art

[0002] With the rapid development of new energy electric vehicles, the demand for charging piles is increasing. For charging piles, charging guns and cables are consumable parts. Considering safety factors, the warranty period is usually only one year. Charging guns and cables that have exceeded the warranty period must be replaced. After dissecting and analyzing scrapped charging guns and cables, it was found that most of the problems occurred on the power terminals of the charging guns, while the gun body and cables rarely had problems.

[0003] As attached Figure 1-2 As shown, two power terminals, DC+ terminal 3 and DC- terminal 4, are installed in the charging gun 2, and both DC+ terminal 3 and DC- terminal 4 are of an integrated structure. There are two most common problems with the power terminal. First, when high voltage and high current are instantly connected, arc discharge occurs between the power terminal and the vehicle-end charging socket, which will cause surface ablation of the power terminal. Second, after long-term use, the power terminal wears out at the contact part with the vehicle-end charging socket, causing the power terminal to heat up seriously due to increased contact resistance, and then the power terminal and the vehicle-end charging socket are adhered due to local overheating.

[0004] The current market price of a set of 250A natural heat dissipation DC charging gun plus a five-meter-long cable is about 1,800 yuan. If the entire set of charging guns is scrapped due to power terminal problems, the economic losses will be huge for charging pile manufacturers and charging pile operators. Summary of the invention

[0005] In order to overcome the shortcomings of the background technology, the present invention discloses a detachable structure of a power terminal of a DC charging gun, which adopts the following technical solution: A detachable structure of a DC charging gun power terminal involves a DC+ power terminal and a DC- power terminal installed in the DC charging gun, wherein the DC+ power terminal and the DC- power terminal are both composed of a plug portion and a tail seat portion, and the tail seat portion and the plug portion are connected by a threaded structure; a conical contact surface for conduction is provided between the tail seat portion and the plug portion.

[0006] After implementing the above technical solution, the beneficial effects are: 1. The DC+ power terminal and DC- power terminal are composed of a plug part and a tail seat part. When installing, the tail seat part is fixed in the charging gun, and the plug part is screwed to the head end of the tail seat part through a threaded structure. The ablation phenomenon occurs on the plug part. When replacing the plug part, you only need to unscrew the ablated plug part and then screw on the new plug part. There is no need to disassemble the charging gun.

[0007] 2. Since the power terminal is a split connection structure, it will affect the conductivity. A conical contact surface for conductivity is set between the tailstock and the plug. The conical contact surface can greatly increase the conductive area between the tailstock and the plug, reduce the contact resistance, and increase the conductivity of the entire power terminal.

[0008] To further improve the technical solution, a cutting surface for disassembly and assembly is provided at the head end of the plug part.

[0009] After implementing the above technical solution, the beneficial effect is that the plug part is a cylinder, lacks a force point for applying torque, and is difficult to screw off directly. After a cut surface is set at the head end of the plug part, it is convenient to use a wrench or other tools to screw off the plug part.

[0010] To further improve the technical solution, there are at least two docking planes, and the docking planes are evenly distributed along the circumference of the plug part.

[0011] To further improve the technical solution, the plug part is provided with a stud, the tail seat part is provided with a threaded hole corresponding to the stud, and the tail seat part and the plug part are connected through a threaded structure.

[0012] To further improve the technical solution, the plug part is provided with a threaded hole, the tail seat part is provided with a stud corresponding to the threaded hole, and the tail seat part and the plug part are connected by a threaded structure.

[0013] After the above technical solution is implemented, the beneficial effect is that the threaded connection structure between the tailstock part and the plug part has two implementation methods. According to design requirements, the stud can be set on the plug part or on the tailstock part.

[0014] To further improve the technical solution, a back-off groove is provided between the conical contact surface and the stud.

[0015] After the above technical solution is implemented, the beneficial effect is that the backing groove is provided, and when the power terminal is tightened, the conical contact surface on the plug part and the conical contact surface on the tailstock part can be closely fitted, thereby reducing the contact resistance.

[0016] To further improve the technical solution, the area of ​​the tapered contact surface is larger than the cross-sectional area of ​​the plug portion.

[0017] After the above technical solution is implemented, the beneficial effect produced is: the conductive surface between the tailstock part and the plug part can be greatly increased, and the contact resistance can be reduced.

[0018] To further improve the technical solution, a plurality of rows of radial heat dissipation holes are arranged in an array on the plug portion.

[0019] After the above technical solution is implemented, the beneficial effect produced is: the radial heat dissipation holes are provided, which is conducive to dissipating the heat generated by the plug part and reducing the temperature of the plug part.

[0020] To further improve the technical solution, an axial heat dissipation hole is provided at the center of the plug part, and each radial heat dissipation hole is connected to the axial heat dissipation hole.

[0021] After implementing the above technical solution, the beneficial effect is that after the axial heat dissipation holes are set, all radial heat dissipation holes can be connected to form a heat dissipation channel, which is beneficial to dissipate the heat generated by the plug part and reduce the temperature of the plug part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1-2 The figure shows a schematic diagram of the installation structure of the existing terminal in the charging gun.

[0023] Attached Figure 3 What is shown is a schematic diagram of the structure of the power terminal in Embodiment 1.

[0024] Attached Figure 4 What is shown is the structural schematic diagram of the tailstock part in Example 1.

[0025] Attached Figure 5 What is shown is a schematic structural diagram of the plug part in Embodiment 1.

[0026] Attached Figure 6 The figure shows a schematic diagram of the installation structure of the power terminal in the charging gun in Embodiment 1.

[0027] Attached Figure 7 What is shown is a schematic diagram of the structure of the power terminal in Example 2.

[0028] Attached Figure 8 What is shown is a schematic diagram of the structure of the power terminal in Example 3. Attached photos

[0029] 1. Power terminal; 11. Tailstock; 111, wiring hole; 112, shaft shoulder; 113, tapered contact surface; 114, threaded hole; 12. Plug part; 121, conical contact surface; 122, disassembly section; 123, stud; 124, back cut; 125, insulation cap; 126, radial heat dissipation hole; 127, axial heat dissipation hole; 2. Charging gun; 3. DC+ terminal; 4. DC-terminal. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Embodiment 1:

[0031] Refer to the attached Figure 3 A detachable structure of a DC charging gun power terminal involves two power terminals 1, DC+ and DC-, installed in a DC charging gun 2. Both the DC+ and DC- power terminals 1 are composed of a plug portion 12 and a tail portion 11. The structure and function thereof are described in detail below.

[0032] Refer to the attached Figure 4 The tailstock 11 is in the shape of a circular shaft, and an inner conical surface and a threaded hole 114 are provided on the left end surface of the tailstock 11, wherein the inner conical surface is a conical contact surface 113. A wiring hole 111 is provided on the right end surface of the tailstock 11, and the wiring hole 111 is used to connect the charging wire in the charging cable.

[0033] A shaft shoulder 112 is also provided on the tailstock portion 11 , and an annular groove for mounting a sealing ring is provided on the shaft shoulder 112 .

[0034] Refer to the attached Figure 5 The plug part 12 is also in the shape of a circular shaft, with an insulating cap 125 sleeved on the left end of the plug part 12, and an outer cone and a stud 123 provided on the right end of the plug part 12. The outer cone is a cone contact surface 121, the area of ​​which is larger than the cross-sectional area of ​​the tailstock part 11, and a backing groove 124 is provided between the cone contact surface 121 and the stud 123.

[0035] A disassembly cut surface 122 is provided at the head end of the plug portion 12. Figure 5It can be seen that the cross-sectional shape of the disassembly cut surface 122 is a missing circle. The purpose of providing the disassembly cut surface 122 is to facilitate the disassembly and assembly of the plug part 12 using tools such as a wrench.

[0036] Refer to the attached Figure 6 . During installation, the tail seat part 11 is tightly inserted into the mounting hole of the charging gun 2. Due to the limitation of the shaft shoulder 112, the tail seat part 11 cannot be pulled out from the mounting hole. The sealing ring is installed between the ring groove and the mounting hole to seal the gap. The plug part 12 is connected to the head end of the tail seat part 11 by screwing the stud 123 and the threaded hole 114. When the plug part 12 and the tail seat part 11 are tightened, the conical contact surface 121 on the plug part 12 fits tightly with the conical contact surface 113 on the tail seat part 11. Since the area of ​​the conical contact surface 121 is larger than the cross-sectional area of ​​the tail seat part 11, the conductive area between the tail seat part 11 and the plug part 12 can be greatly increased, the contact resistance can be reduced, and the conductivity of the entire power terminal can be increased. In addition, the screwing of the stud 123 and the threaded hole 114 also increases the contact surface between the tail seat part 11 and the plug part 12, thereby improving the conductivity of the power terminal.

[0037] The ablation phenomenon occurs on the plug part 12. When replacing, it is only necessary to unscrew the ablated plug part 12 and then screw on a new plug part 12. Obviously, such a design does not require the charging gun 2 to be disassembled when replacing the power terminal 1.

[0038] In addition, there is a small annular gap at the position where the plug part 12 and the tail seat part 11 are connected, and the presence of the annular gap reduces the contact area between the power terminal and the charging seat. Therefore, the annular gap can be set as close to the mounting hole as possible. Embodiment 2:

[0039] Refer to the attached Figure 7 The difference between this embodiment and the first embodiment is that a countersunk hole is provided on the left end surface of the tailstock portion 11, and a stud and a conical contact surface are provided in the countersunk hole. The threaded hole and another conical contact surface are provided on the plug portion 12. Obviously, this screw connection structure can also realize the replacement of the plug portion 12.

[0040] In embodiment 1, there is an annular seam at the position where the plug part 12 and the tail seat part 11 are connected. In this embodiment, the connecting seam is located in the countersunk hole of the tail seat part 11, and the power terminal does not expose the annular seam, thereby increasing the effective conductive area of ​​the power terminal and the charging seat. Embodiment 3:

[0041] Refer to the attached Figure 8 The present embodiment is different from the first embodiment in that four rows of radial heat dissipation holes 126 are evenly distributed on the plug portion 12 . An axial heat dissipation hole 127 is provided at the center of the plug portion 12 , and each radial heat dissipation hole 126 is connected to the axial heat dissipation hole 127 .

[0042] After the radial heat dissipation holes 126 are provided, it is beneficial to dissipate the heat generated by the plug part 12 and reduce the temperature of the plug part 12. After the axial heat dissipation holes 127 are provided, all radial heat dissipation holes 126 can be connected to form a heat dissipation channel, which is beneficial to further dissipate the heat generated by the plug part 12.

[0043] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A detachable structure of a DC charging gun power terminal, involving a DC+ power terminal and a DC- power terminal installed in a DC charging gun, characterized in that: The DC+ power terminal and the DC- power terminal are both composed of a plug part and a tail seat part, and the tail seat part and the plug part are connected by a threaded structure; a conical contact surface for conduction is arranged between the tail seat part and the plug part.

2. The detachable structure of the power terminal of a DC charging gun according to claim 1, characterized in that: A cutting surface for disassembly and assembly is arranged at the head end of the plug part.

3. The detachable structure of the power terminal of a DC charging gun according to claim 1, characterized in that: The plug part is provided with a stud, the tail seat part is provided with a threaded hole corresponding to the stud, and the tail seat part and the plug part are connected through a threaded structure.

4. The detachable structure of the power terminal of a DC charging gun according to claim 1, characterized in that: The plug part is provided with a threaded hole, the tail seat part is provided with a stud corresponding to the threaded hole, and the tail seat part and the plug part are connected through structural threads.

5. A detachable structure of a DC charging gun power terminal as claimed in claim 3 or 4, characterized in that: A relief groove is arranged between the conical contact surface and the stud.

6. The detachable structure of the power terminal of a DC charging gun according to claim 1, characterized in that: The area of ​​the tapered contact surface is larger than the cross-sectional area of ​​the plug portion.

7. The detachable structure of the power terminal of a DC charging gun according to claim 1, characterized in that: A plurality of rows of radial heat dissipation holes are arranged in an array on the plug portion.

8. The detachable structure of the power terminal of a DC charging gun according to claim 7, characterized in that: An axial heat dissipation hole is arranged at the center of the plug part, and each radial heat dissipation hole is connected with the axial heat dissipation hole.

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