CN220963809U

CN220963809U - Terminal contact pin and photovoltaic inverter

Info

Publication number: CN220963809U
Application number: CN202322508046.1U
Authority: CN
Inventors: 姜国栋; 陈运启
Original assignee: Sungrow Power Supply Co Ltd
Current assignee: Sungrow Power Supply Co Ltd
Priority date: 2023-09-14
Filing date: 2023-09-14
Publication date: 2024-05-14
Anticipated expiration: 2033-09-14

Abstract

The utility model relates to the technical field of photovoltaic power generation and provides a terminal pin and a photovoltaic inverter. Therefore, the terminal pin is designed into an integrated structure, so that the processing technology of the terminal pin is simplified, and the manufacturing cost and the manufacturing failure risk are reduced; simultaneously, be convenient for pass through threaded fastener locking on the pad of PCB board for terminal contact pin and PCB board pass through the pad and connect and switch on, not only can improve the convenience of complete machine assembly greatly, can also save assembly man-hour, reduce the assembly risk, moreover, promoted the reliability of electric connection between terminal contact pin and the PCB board.

Description

Terminal contact pin and photovoltaic inverter

Technical Field

The utility model relates to the technical field of photovoltaic power generation, in particular to a terminal pin and a photovoltaic inverter.

Background

Currently, in photovoltaic inverters, electrical connection is typically made between the PV terminals and the PCB board using a connection structure consisting of OT terminals, wires and pins. The OT terminal is used for connecting an internal circuit, the contact pin is used for being inserted into the PV terminal to be connected with a user end, and the OT terminal and the contact pin are respectively connected at two ends of a wire in a crimping mode. The connecting structure has the advantages that the two crimping processes are needed in the production process of the connecting structure, so that the accumulated tolerance is large, the quality risk of poor crimping is increased, the whole size is difficult to control, the processing process is complex, and the material and working hour costs are high.

Disclosure of utility model

The utility model solves the problems that: how to reduce the processing difficulty and the manufacturing cost of the connection structure between the PV terminal and the PCB.

In order to solve the problems, the utility model provides a terminal pin which comprises a pin body, a threaded part and an inserting part, wherein the threaded part and the inserting part are respectively and integrally connected with two ends of the pin body, the threaded part is used for being connected with a PCB (printed circuit board) through a threaded fastener, and the inserting part is used for being inserted with a PV terminal.

Optionally, the contact pin body connect in the one end of screw thread portion is equipped with first limit structure, first limit structure is used for restricting the terminal contact pin is along its axial orientation is close to PCB board direction removes.

Optionally, be equipped with through-hole, first pad and second pad on the PCB board, first pad with the second pad is located respectively the both ends of through-hole, just the second pad is located the PCB board is towards one side of PV terminal, screw thread portion is used for passing in proper order the second pad the through-hole with first pad, and pass through screw thread fastener is fixed in on the first pad, first limit structure be used for with second pad butt.

Optionally, the first limit structure includes the supporting legs, the supporting legs has first end and second end, the first end of supporting legs connect in the contact pin body, the second end of supporting legs be used for with PCB board butt, just the supporting legs with distance between the axis of screw thread portion is followed the first end of supporting legs is to the second end direction increase gradually.

Optionally, the supporting legs are provided with a plurality of supporting legs, and the plurality of supporting legs are uniformly distributed along the circumference of the contact pin body.

Optionally, the contact pin body connect in the one end of grafting portion is equipped with second limit structure, second limit structure is used for restricting the terminal contact pin is along its axial towards being close to the PV terminal direction removes.

Optionally, the second limit structure includes spacing protruding, spacing protruding is followed the circumference of contact pin body is laid, and is used for with the PV terminal butt is spacing.

Optionally, the plug-in connection part is a male plug or a female socket.

Optionally, the sum of the dimension of the threaded fastener along its axial direction and a preset number of turns of the thread is equal to the dimension of the threaded portion along its axial direction, wherein the preset number of turns of the thread is between one and three turns.

In order to solve the above problems, the present utility model also provides a photovoltaic inverter including the terminal pin as described above.

Compared with the prior art, the utility model has the following beneficial effects:

According to the utility model, the pin body, the inserting part and the threaded part of the terminal pin are integrally connected, so that the terminal pin is integrally in an integral structure, the processing technology of the terminal pin is simplified to a great extent, and the manufacturing cost and the manufacturing process failure risk are reduced; meanwhile, the external threads are arranged on the threaded parts so that the threaded parts can be locked on the bonding pads of the PCB through threaded fasteners such as nuts, and the terminal pins are connected and conducted with the PCB through the bonding pads. In addition, the rigid connector such as the terminal pin is adopted to realize connection between the PV terminal and the PCB, so that the terminal pin is prevented from deforming in the assembly process, the insulating rubber is prevented from being used for wrapping the wire harness, and the lap joint risk between the connectors is reduced.

Drawings

Fig. 1 is a schematic structural view of a terminal pin in an embodiment of the present utility model when the plug-in portion is a male plug;

Fig. 2 is a schematic structural diagram of a terminal pin in the embodiment of the utility model when the plugging portion is a female socket;

Fig. 3 is an assembly schematic diagram of a terminal pin connecting a PCB board and a PV terminal according to an embodiment of the present utility model.

Reference numerals illustrate:

1. A pin body; 11. a first limit structure; 12. a second limit structure; 2. a plug-in part; 3. a threaded portion; 400. a PV terminal; 500. a PCB board; 510. a through hole; 520. a first bonding pad; 530. a second bonding pad; 600. a threaded fastener.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

The Z-axis in the drawing represents the vertical direction, i.e., the up-down position, and the forward direction of the Z-axis (i.e., the arrow of the Z-axis points) represents the up direction, and the reverse direction of the Z-axis represents the down direction. It should also be noted that the foregoing Z-axis is provided merely for convenience of description and to simplify the description and is not to be construed as indicating or implying that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

Referring to fig. 1 and 2, an embodiment of the present utility model provides a terminal pin, which includes a pin body 1, a plugging portion 2, and a threaded portion 3 provided with external threads, wherein the plugging portion 2 and the threaded portion 3 are integrally connected with two ends of the pin body 1, the plugging portion 2 is used for plugging with a PV terminal 400, and the threaded portion 3 is used for connecting with a PCB board 500 through a threaded fastener 600.

Specifically, the terminal pin is generally an integral metal structure, and is generally used in a vertical state, the plugging portion 2 is a portion of the terminal pin for plugging and mating with a terminal component such as the PV terminal 400, and is generally a lower end of the terminal pin (i.e., the terminal pin is located at an end opposite to the Z-axis in fig. 1), and the threaded portion 3 is a portion of the terminal pin provided with external threads, and is generally an upper end of the terminal pin (i.e., the terminal pin is located at an end opposite to the Z-axis in fig. 1). In use, the plugging portion 2 of the terminal pin can be inserted into the housing of the PV terminal 400, the PCB 500 is assembled, the threaded portion 3 of the terminal pin is exposed out of the through hole 510 (described later) on the PCB 500, and finally the terminal pin is connected to the PCB 500 via the pad by locking the threaded fastener 600 such as a nut on the pad of the PCB 500.

In the embodiment, the pin body 1, the plugging part 2 and the threaded part 3 of the terminal pin can be integrally connected, so that the whole terminal pin is of an integral structure, the processing technology of the terminal pin is simplified to a great extent, and the manufacturing cost and the manufacturing process failure risk are reduced; meanwhile, by arranging the external threads on the threaded portion 3 so as to lock the threaded portion 3 on, for example, a bonding pad of the PCB 500 through, for example, a nut and the like, the terminal pin is connected and conducted with the PCB 500 through the bonding pad, and compared with the prior art in a crimping manner, the convenience of assembly of the whole machine can be greatly improved, assembly time can be saved, assembly risk is reduced, and the reliability of electric connection between the terminal pin and the PCB 500 is improved. In addition, the connection between the PV terminal 400 and the PCB 500 is realized by using the rigid connector such as the terminal pin, so that the terminal pin is not deformed in the assembly process, and the insulating rubber is prevented from wrapping the wire harness, so that the lap joint risk between the connectors is reduced.

Optionally, as shown in fig. 1 and fig. 2, one end of the pin body 1 connected to the threaded portion 3 is provided with a first limiting structure 11, where the first limiting structure 11 is used to limit the movement of the terminal pin along the axial direction thereof toward the direction approaching the PCB 500.

In this embodiment, the axial direction of the terminal pin is parallel to the Z-axis direction in fig. 1 and 2, that is, parallel to the up-down direction, and the terminal pin generally passes through the PCB 500 and is locked on the pad of the PCB 500 by the nut, that is, the first limiting structure 11 is used to limit the terminal pin from moving along the axial direction thereof toward the direction approaching the PCB 500, which is to be understood as that the first limiting structure 11 is used to limit the terminal pin from moving upward. In this way, in the process of locking the threaded portion 3 using the threaded fastener 600, the terminal pins can be restricted from moving upward by the first limiting structure 11, so as to avoid the terminal pins from protruding excessively upward out of the PCB 500.

Optionally, as shown in fig. 3, the PCB 500 is provided with a through hole 510, a first bonding pad 520 and a second bonding pad 530, the first bonding pad 520 and the second bonding pad 530 are respectively located at two ends of the through hole 510, the second bonding pad 530 is located at one side of the PCB 500 facing the PV terminal 400, the threaded portion 3 is used for sequentially passing through the second bonding pad 530, the through hole 510 and the first bonding pad 520, and is fixed on the first bonding pad 520 through a threaded fastener, and the first limiting structure 11 is used for abutting against the second bonding pad 530.

In this embodiment, the PCB 500 is generally provided with a circular hole, i.e. a through hole 510, and pads are respectively embedded at the upper and lower ends of the through hole 510, wherein the pad at the upper end of the through hole 510 is a first pad 520, and the pad at the lower end of the through hole 510 is a second pad 530. In assembly, the plugging portion 2 of the terminal pin is typically inserted into the housing of the PV terminal 400 to electrically connect the terminal pin and the PV terminal 400, then the threaded portion 3 of the terminal pin is passed through the through hole 510 of the PCB 500, the first limiting structure 11 is abutted against the second bonding pad 530, and then the threaded fastener 600 such as a nut is screwed onto the threaded portion 3, so as to lock the terminal pin on the first bonding pad 520, so that the terminal pin is connected and conducted with the PCB 500 through the bonding pad. In this way, the connection between the terminal pins and the PV terminals 400 and the PCB 500 is realized, and the operation is simple and convenient.

Optionally, as shown in connection with fig. 1 and 2, the first limiting structure 11 includes a supporting leg, the supporting leg has a first end and a second end, the first end of the supporting leg is connected to the pin body 1, the second end of the supporting leg is used for being abutted to the PCB 500, and a distance between the supporting leg and an axis of the threaded portion 3 increases gradually along a direction from the first end to the second end of the supporting leg.

In this embodiment, the first end and the second end of the supporting leg are respectively a lower end and an upper end of the supporting leg, the lower end of the supporting leg is generally integrally connected with the pin body 1, and the upper end of the supporting leg is generally used for abutting against a bonding pad of the PCB 500. At the same time, the distance between the support leg and the axis of the screw part 3 increases gradually from the lower end to the upper end of the support leg, that is, the upper end of the support leg is inclined obliquely upward, or the support leg is disposed at an acute angle to the axis of the screw part 3. In this way, the supporting legs can prevent the terminal pins from excessively moving upwards, and can better provide supporting acting force for the PCB 500; moreover, the supporting legs are adopted as the first limiting structure 11 to realize limiting, so that the mechanical structure of the first limiting structure 11 can be simplified, and the processing and the manufacturing are facilitated.

Alternatively, as shown in fig. 1 and 2, a plurality of supporting legs are provided, and the plurality of supporting legs are uniformly distributed along the circumferential direction of the pin body 1. In this way, the first limit structure 11 formed by the plurality of supporting legs is made to be a substantially barb-like structure, thereby better preventing excessive upward movement of the terminal pins; moreover, a plurality of supporting legs are respectively abutted with the second bonding pads of the PCB 500 to provide support, so that the second bonding pads are uniformly stressed, the risk of loosening the second bonding pads is reduced, and the reliability of electric connection between the terminal pins and the PCB 500 is further ensured.

Optionally, as shown in fig. 1 and fig. 2, the end of the pin body 1 connected to the socket portion 2 is provided with a second limiting structure 12, where the second limiting structure 12 is used to limit the movement of the terminal pin along the axial direction thereof toward the direction approaching the PV terminal 400.

In this embodiment, the axial direction of the terminal pin is parallel to the Z-axis direction in fig. 1 and 2, i.e., parallel to the up-down direction, and the terminal pin is generally inserted downward into the housing of the PV terminal 400, that is, the second limiting structure 12 is used to limit the movement of the terminal pin in the direction approaching the PV terminal 400 along the axial direction thereof, which is to be understood as the second limiting structure 12 is used to limit the downward movement of the terminal pin. In this way, when the second limit structure 12 abuts against a limit structure such as a boss in the housing of the PV terminal 400 during the process of inserting the terminal pin into the housing of the PV terminal 400, it indicates that the terminal pin is already inserted in place, and at this time, the terminal pin cannot be inserted again, so as to achieve the plug-in fit between the two.

Optionally, as shown in connection with fig. 1 and 2, the second limiting structure 12 includes a limiting protrusion, where the limiting protrusion is disposed along the circumferential direction of the pin body 1 and is used to abut against the PV terminal 400 for limiting.

In this embodiment, the limiting protrusion may be an annular protrusion structure of a whole circle, or may be a structure of a circle surrounded by a plurality of small protrusions shown in fig. 1 and fig. 2 along the circumference of the pin body 1, in practical application, in order to reduce design difficulty and reduce consumable and weight, it is generally preferable that the limiting protrusion is a plurality of small protrusions, and the plurality of small protrusions are uniformly distributed along the circumference of the pin body 1. In the process of inserting the terminal pin into the PV terminal 400, when the limit protrusion abuts against, for example, a step structure in the PV terminal 400, the terminal pin cannot be inserted again, which means that the terminal pin is already inserted in place, so that the insertion fit between the two is realized, and the structure is simple, and the processing and the manufacturing are easy.

Alternatively, as shown in connection with fig. 1 and 2, the plug-in portion 2 is a male plug or a female socket. Like this for the terminal contact pin can adopt public mother to the mode of inserting to realize electric connection with the PV terminal, easy operation is convenient.

Alternatively, the dimension of the threaded portion 3 in its axial direction is equal to the sum of the dimension of the threaded fastener 600 in its axial direction and a preset number of turns, wherein the preset number of turns is between one and three turns.

In this embodiment, the number of preset screw turns is usually the screw allowance, that is, the number of screw turns exposed after the screw thread portion 3 is locked on the first pad 520 of the PCB 500 by the screw fastener 600, in practical application, it is generally preferable that the number of preset screw turns is two, that is, when the screw thread portion 3 of the terminal pin is locked on the first pad 520 of the PCB 500 by the screw fastener 600 and the first limiting structure 11 abuts on the second pad 530, one end of the screw thread portion 3 close to the PV terminal (that is, the lower end of the screw thread portion 3) is exposed only two turns of screw threads. That is, the dimension of the threaded portion 3 in the axial direction thereof is slightly larger than that of the threaded fastener 600 in the axial direction thereof, so that the processing length of the external thread on the terminal pin can be reduced, the production efficiency can be improved, and the threaded fastener 600 can be prevented from being screwed onto the pin body 1 without threads under the action of the first limit structure 11 of the barb-like structure, thereby ensuring the reliability of connection.

Further, the pin body 1, the insertion part 2 and the threaded part 3 are in a hollow cylindrical structure and are coaxially arranged. Therefore, the weight and the consumable of the terminal pin can be reduced, and the production cost is reduced.

Further, the outer diameter of the pin body 1 is equal to the outer diameter of the threaded portion 3.

In this embodiment, if the outer diameter of the pin body 1 is set smaller than the outer diameter of the threaded portion 3, the rigidity of the pin body 1 tends to be insufficient, and the processing difficulty is high; if the outer diameter of the pin body 1 is set larger than the outer diameter of the screw portion 3, an increase in weight and cost is likely to occur. Therefore, the outer diameter of the pin body 1 is designed to be equal to the outer diameter of the threaded portion 3, so that the terminal pin has the rigidity meeting the use requirement, light weight and certain economical efficiency, and is convenient to process and manufacture.

Another embodiment of the present utility model provides a photovoltaic inverter comprising the terminal pin described above.

In this embodiment, the photovoltaic inverter further includes a PV terminal 400 and a PCB 500, and the PCB 500 is generally provided with a circular hole, i.e. a through hole 510, and bonding pads are respectively embedded at the upper and lower ends of the through hole 510. In assembly, the plugging portion 2 of the terminal pin is usually inserted into the housing of the PV terminal 400 to electrically connect the terminal pin and the PV terminal 400, then the threaded portion 3 of the terminal pin is passed through the through hole 510 of the PCB 500, the first limiting structure 11 is abutted against the bonding pad located at the lower end of the through hole 510, and the threaded fastener 600 is screwed onto the threaded portion 3, so that the terminal pin is locked on the bonding pad located at the upper end of the through hole 510, and the terminal pin is connected and conducted with the PCB 500 through the bonding pad. In addition, the photovoltaic inverter in this embodiment has the same beneficial effects as the terminal pins described above with respect to the prior art, and will not be described here again.

Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.

Claims

1. The utility model provides a terminal contact pin, its characterized in that includes contact pin body (1), grafting portion (2) and is equipped with external screw thread portion (3), grafting portion (2) with screw thread portion (3) respectively with the both ends integral type of contact pin body (1), grafting portion (2) are used for pegging graft with PV terminal (400), screw thread portion (3) are used for being connected with PCB board (500) through threaded fastener (600).

2. The terminal pin according to claim 1, wherein a first limit structure (11) is provided at one end of the pin body (1) connected to the threaded portion (3), and the first limit structure (11) is used for limiting the terminal pin to move along an axial direction thereof toward a direction approaching the PCB board (500).

3. The terminal pin according to claim 2, wherein the PCB (500) is provided with a through hole (510), a first bonding pad (520) and a second bonding pad (530), the first bonding pad (520) and the second bonding pad (530) are located at two ends of the through hole (510), respectively, and the second bonding pad (530) is located at one side of the PCB (500) facing the PV terminal (400), and the threaded portion (3) is configured to sequentially pass through the second bonding pad (530), the through hole (510) and the first bonding pad (520), and be fixed on the first bonding pad (520) by the threaded fastener (600), and the first limiting structure (11) is configured to be abutted with the second bonding pad (530).

4. The terminal pin according to claim 2, characterized in that the first limit structure (11) comprises a supporting leg having a first end and a second end, the first end of the supporting leg being connected to the pin body (1), the second end of the supporting leg being adapted to abut against the PCB board (500), and the distance between the supporting leg and the axis of the threaded portion (3) increasing in the direction from the first end to the second end of the supporting leg.

5. Terminal pin according to claim 4, characterized in that the support legs are provided in plurality and the support legs are evenly distributed along the circumference of the pin body (1).

6. The terminal pin according to claim 1, wherein a second limiting structure (12) is provided at an end of the pin body (1) connected to the plugging portion (2), and the second limiting structure (12) is used for limiting the terminal pin to move along an axial direction thereof toward a direction approaching the PV terminal (400).

7. The terminal pin according to claim 6, characterized in that the second limit structure (12) comprises a limit projection arranged along the circumference of the pin body (1) and adapted to abut against the PV terminal (400).

8. Terminal pin according to claim 1, characterized in that the plug-in part (2) is a male plug or a female socket.

9. The terminal pin according to claim 1, characterized in that the dimension of the threaded portion (3) in its axial direction is equal to the sum of the dimension of the threaded fastener (600) in its axial direction and a preset number of turns, wherein the preset number of turns is comprised between one and three turns.

10. A photovoltaic inverter comprising the terminal pin of any one of claims 1-9.