Self-sealing pin and connection terminal
By incorporating a stop and a buffer chamber within the pin, the problem of molten plastic overflow is solved, ensuring the pin's conductivity, preventing the formation of an insulating layer, and achieving a self-sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TUERKE (TIANJIN) CHUANGAN CO LTD
- Filing Date
- 2025-04-18
- Publication Date
- 2026-06-05
AI Technical Summary
During the high-pressure injection molding process, molten plastic tends to overflow from the joint seam and process hole, causing an insulating layer to form on the outer surface of the pin tip, affecting conductivity and resulting in poor conductivity defects in the connection terminal.
The design incorporates a self-sealing needle with two baffles and a buffer chamber inside the needle body. These baffles and buffer chambers provide multiple physical barriers to prevent molten plastic from overflowing onto the outer surface of the needle tip, thus ensuring conductivity.
It effectively prevents molten plastic from overflowing from the pin, avoids the formation of an insulating layer, ensures the conductivity of the connection terminal, and solves the problem of poor conductivity.
Smart Images
Figure CN224328945U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical connectors, and in particular to a self-sealing pin and a connecting terminal. Background Technology
[0002] A connector is an electrical connector between a wire and a connected device. A connector mainly consists of two parts: a pin and a terminal body. The terminal body is fixed to one end of the pin by a rubber coating (injection molding). The wire is inserted into the connected device through the pin on the connector to achieve a conductive connection between the wire and the connected device.
[0003] Currently, most pins use a hollow structure instead of the traditional solid structure. Hollow pins are processed by sheet metal stamping and bending, which reduces production costs in terms of materials and processing compared to the turning process of solid structures, while improving production efficiency. However, after the pins are formed by stamping and bending, due to the limitations of the stamping and bending process, there are axially extending seams on the sides of the pins and process holes at the pin tips. During the process of overmolding the end body, molten plastic injected under high pressure enters the interior of the pin and overflows from the seams and process holes to the outer surface of the pin. When the molten plastic overflows onto the outer surface of the pin tip and forms an insulating layer, the insulating layer affects the conductivity between the pin and the connected electrical device, resulting in product defects such as poor conductivity at the connection terminals. Utility Model Content
[0004] The purpose of this invention is to provide a self-sealing pin and connector terminal to prevent molten plastic from overflowing from the inside of the pin through the joint seam and process hole to the outer surface of the pin tip, and to prevent the formation of an insulating layer on the outer surface of the pin tip, so as to avoid product defects such as poor conductivity in the connector terminal.
[0005] The technical solution provided by this utility model is as follows: a self-sealing needle, including a needle body for connecting with a wire, a needle tip on one end of the needle body, the needle tip and the needle body being hollow structures and interconnected, an opening communicating with the interior of the needle body at the opposite end, a side hole on the side of the needle body, a stop on the edge of the side hole away from the needle tip and the edge of the opening respectively, two stops each located on one side of the axis of the needle body, and bent to the opposite side of the axis of the needle body and abutting against the inner wall of the needle body, the two stops being spaced apart and forming a buffer chamber between the two stops.
[0006] In the self-sealing needle described above, the stop on the edge of the side hole is located on the first side of the needle body, and the stop on the edge of the opening is located on the second side of the needle body. The first side and the second side of the needle body are mutually designated as opposite sides of the needle body.
[0007] In the self-sealing insert described above, a limiting part is provided on the inner wall of the insert body, which is opposite to the side hole. The limiting part is used to abut against the stop on the side hole.
[0008] In the self-sealing insert described above, the limiting portion extends circumferentially along the needle body to the edges of opposite sides of the side hole.
[0009] In the aforementioned self-sealing pin, the pin body includes a transition section and a connecting section. The pin tip, the transition section, and the connecting section are connected in sequence. The outer diameter of the transition section is smaller than the outer diameter of the connecting section. The limiting part is formed at the junction of the transition section and the connecting section. The side hole is opened at the junction of the transition section and the connecting section. The opening is located on the end of the connecting section away from the transition section. Both of the stops are located inside the connecting section.
[0010] In the aforementioned self-sealing pin, a wiring portion is also provided at the edge of the opening, and the wiring portion is disposed on both sides of the pin body opposite to the stop portion on the opening.
[0011] In the self-sealing pin described above, the wiring portion includes a first crimp pin and a second crimp pin, and the pin head, the pin body, the first crimp pin, and the second crimp pin are connected in sequence.
[0012] In the aforementioned self-sealing insert, a wing hole is provided on the side of the needle body. The wing hole is located between the needle tip and the side hole. A side wing is provided on the edge of the wing hole near the needle tip for locking onto the inner wall of the connecting needle seat. The side of the side wing away from the needle tip is bent to the outside of the needle body.
[0013] In the aforementioned self-sealing insert, the edge of the side wing is provided with a sharp edge for piercing into the inner wall of the connecting needle seat.
[0014] The connecting terminal includes an end body for wrapping a wire and a self-sealing pin as described in any of the preceding claims, wherein the pin tip, the pin body, and the end body are arranged sequentially, the end body is connected to the pin body, and extends into the buffer chamber.
[0015] The beneficial effects of this utility model after adopting the above technical solution are as follows:
[0016] This technical solution involves setting two baffles inside the needle body: a first baffle at the edge of the opening and a second baffle at the edge of the side hole. During high-pressure injection molding, the molten plastic is located at the opening of the needle body and flows into the needle body. The first baffle, the buffer chamber, and the second baffle physically block the molten plastic. The first baffle acts as the first layer of physical barrier, preventing most of the molten plastic from entering the needle body. However, due to limitations in processing precision, a gap exists between the first baffle and the inner wall of the needle body, allowing a small amount of molten plastic to enter the buffer chamber through this gap. The buffer chamber then... The second physical barrier, the buffer chamber, forms a relatively independent space within the needle body for the molten plastic to flow through. The pressure on the molten plastic within the buffer chamber is reduced, thus lowering the flow rate and extrusion pressure. The second baffle acts as the third physical barrier, further blocking the molten plastic whose flow rate and extrusion pressure have been reduced. This completely confines the molten plastic to one side of the needle tip, preventing it from overflowing from inside the needle through the joint seam and process hole to the outer surface of the needle tip. This also prevents the formation of an insulating layer on the outer surface of the needle tip, thus avoiding product defects such as poor conductivity at the connection terminals. Attached Figure Description
[0017] Figure 1 This is a half-sectional schematic diagram of the self-sealing pin of Embodiment 1 of this utility model;
[0018] Figure 2 This is a top view of the self-sealing pin of Embodiment 1 of this utility model;
[0019] Figure 3 This is a bottom view of the self-sealing pin of Embodiment 1 of this utility model;
[0020] Figure 4 This is a schematic diagram of the assembly of the self-sealing insert and the connecting pin seat in Embodiment 1 of this utility model.
[0021] Reference numerals: 1. Needle tip; 2. Needle body; 3. Wire connection part; 4. Joint seam; 5. Process hole; 6. Connecting needle seat;
[0022] 21. Transition section; 22. Limiting part; 23. Connecting section; 24. First stop; 25. Buffer chamber; 26. Second stop; 27. Side hole; 28. Wing hole; 29. Side wing;
[0023] 31. First crimp pin; 32. Second crimp pin. Detailed Implementation
[0024] The technical solution of this utility model will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on this utility model.
[0025] Example 1:
[0026] like Figure 1-4 As shown, this utility model provides a self-sealing pin, including a pin body 2 for connecting with a wire. One end of the pin body 2 is provided with a needle tip 1. Both the needle tip 1 and the pin body 2 are hollow structures and are interconnected. The opposite end of the pin body 2 is provided with an opening that communicates with its interior. A side hole 27 is provided on the side of the pin body 2. A stop is provided on the edge of the side hole 27 away from the needle tip 1 and the edge of the opening. The two stops are each provided on one side of the axis of the pin body 2 and are bent to the opposite side of the axis of the pin body 2 and abut against the inner wall of the pin body 2. The two stops are spaced apart and form a buffer chamber 25 located between the two stops.
[0027] Its working principle is as follows: Two baffles are set inside the needle body 2. The baffle at the edge of the opening is the first baffle 24, and the baffle at the edge of the side hole 27 is the second baffle 26. During high-pressure injection molding, the molten plastic is located at the opening of the needle body 2 and flows into the needle body 2. The first baffle 24, the buffer chamber 25, and the second baffle 26 physically block the molten plastic. The first baffle 24 acts as the first physical barrier, blocking most of the molten plastic outside the needle body 2. However, due to limitations in processing precision, there is a gap between the first baffle 24 and the inner wall of the needle body 2. A small amount of molten plastic enters the buffer chamber 25 through this gap, thus preventing the molten plastic from entering the needle body 2. The buffer chamber 25 serves as the second physical barrier, forming a relatively independent space within the needle body 2 for the molten plastic to flow. The pressure on the molten plastic within the buffer chamber 25 is reduced, thus lowering the flow rate and extrusion pressure. The second baffle 26 serves as the third physical barrier, blocking the molten plastic whose flow rate and extrusion pressure have been reduced. This completely blocks the molten plastic on one side of the needle tip 1, preventing it from overflowing from the inside of the needle through the joint seam 4 and process hole 5 to the outer surface of the needle tip 1. This also prevents the formation of an insulating layer on the outer surface of the needle tip 1, thus avoiding product defects such as poor conductivity at the connection terminals.
[0028] In practical application, when the two stops abut against the inner wall of the needle body 2, all edges of the outer contour of the two stops (i.e., all edges other than the bends and corners of the stops and the needle body 2) are pressed against the inner wall of the needle body 2.
[0029] Preferably, the stop on the edge of the side hole 27 is provided on the first side of the needle body 2, and the stop on the edge of the opening is provided on the second side of the needle body 2. The first side and the second side of the needle body 2 are respectively set as opposite sides of the needle body 2.
[0030] In practical applications, the gap between the stop on the edge of the opening (i.e., the first stop 24) and the inner wall of the needle body 2 is located on the second side of the needle body 2, while the gap between the stop on the edge of the side hole 27 (i.e., the second stop 26) and the inner wall of the needle body 2 is located on the first side. After the molten plastic enters the buffer chamber 25 through the gap of the first stop 24, it first flows to the bend corner between the second stop 26 and the needle body 2, so as to prevent the molten plastic from flowing directly to the gap of the second stop 26 under high pressure, so as to prevent the molten plastic from overflowing into the needle head 1 through the gap of the second stop 26.
[0031] In addition, when the injection volume, injection temperature or injection pressure of the molten plastic is small, the gap at the first stop 24 and the gap at the second stop 26 can be set on the same side of the needle body 2, or they can be arranged in an alternating pattern along the circumference of the needle body 2 or other spatial arrangement methods. This embodiment does not impose too many restrictions on this.
[0032] Another preferred embodiment is that the needle tip 1 and the needle body 2, the first stop 24 and the needle body 2, and the second stop 26 and the needle body 2 are all integrally formed.
[0033] As a further improvement, the inner wall of the needle body 2 is provided with a limiting part 22 that is opposite to the side hole 27. The limiting part 22 is used to press against the stop on the side hole 27.
[0034] In specific implementation, the limiting part 22 can be either a protrusion or a step, and this embodiment does not impose too many restrictions on it.
[0035] Another improvement is that the limiting part 22 extends circumferentially along the needle body 2 to the edges of the opposite sides of the side hole 27.
[0036] The extended structure of the limiting part 22 increases the contact area with the edge of the second stop part 26, enhancing the clamping strength of the limiting part 22. In addition, the greater the extrusion force of the molten plastic on the second stop part 26, the closer the second stop part 26 and the limiting part 22 are, resulting in better sealing at that point and strengthening the self-sealing property of the second stop part 26.
[0037] In this embodiment, the needle body 2 includes a transition section 21 and a connecting section 23. The needle tip 1, the transition section 21 and the connecting section 23 are connected in sequence. The outer diameter of the transition section 21 is smaller than the outer diameter of the connecting section 23. A limiting part 22 is formed at the junction of the transition section 21 and the connecting section 23. A side hole 27 is opened at the junction of the transition section 21 and the connecting section 23. The opening is located on the end of the connecting section 23 away from the transition section 21. Both stops are located inside the connecting section 23.
[0038] When the second stop 26 is squeezed by the molten plastic in the buffer chamber 25 and moves toward the needle 1 in a swinging manner, the limiting part 22 abuts against the end face of the second stop 26 away from the first stop 24, that is, the limiting part 22 abuts against the edge areas of all places except the corner bend between the second stop 26 and the needle body 2.
[0039] In some embodiments, the outer peripheral surface of the connecting segment 23 is interference-fitted with the inner hole of the connecting pin seat 6 to enhance the connection strength between the pin and the connecting pin seat 6.
[0040] In this embodiment, a wiring part 3 is also provided at the edge of the opening. The wiring part 3 is disposed on both sides of the needle body 2 opposite to the stop on the opening. The needle body 2 is electrically connected to the wire through the wiring part 3.
[0041] Preferably, the wiring part 3 and the pin body 2 are integrally formed.
[0042] In practical use, the connector 3 includes a first crimping foot 31 and a second crimping foot 32. The needle 1, the needle body 2, the first crimping foot 31 and the second crimping foot 32 are connected in sequence. Both the first crimping foot 31 and the second crimping foot 32 are arc surfaces coaxial with the needle body 2.
[0043] In this embodiment, a wing hole 28 is provided on the side of the needle body 2. The wing hole 28 is located between the needle tip 1 and the side hole 27. A side wing 29 is provided on the edge of the wing hole 28 near the needle tip 1 for locking onto the inner wall of the connecting needle seat 6. The side of the side wing 29 away from the needle tip 1 is bent to the outside of the needle body 2. The side wing 29 can be engaged with the locking position in the connecting needle seat 6 to prevent the needle from accidentally coming out of the connecting needle seat 6 under external force.
[0044] In another improvement of this embodiment, the edge of the side wing 29 is provided with a sharp edge for piercing the inner wall of the connecting needle seat 6.
[0045] When the pin is pulled out of the connector pin seat 6 by an external force, the side wing 29 uses its sharp edge to pierce into the inner wall of the connector pin seat 6, that is, to embed into the inner wall of the connector pin seat 6. The greater the pulling force on the pin, the greater the depth of the side wing 29, making the connection between the pin and the connector pin seat 6 more secure and preventing the pin from being pulled out. Compared with other snap-fit methods, it is not necessary to set a snap-fit position in the connector pin seat 6 to cooperate with the side wing, which reduces the production difficulty and cost of the connector pin seat 6. Correspondingly, it improves the compatibility of the pin with different types of connector pin seats 6.
[0046] As a further improvement of this embodiment, the angle between the side wing 29 and the axis of the needle body 2 is no greater than 15°, so that after the needle is inserted into the connecting needle seat 6, the side wing 29 is prevented from undergoing permanent deformation and losing its elastic deformation function. When the maximum angle between the side wing 29 and the axis of the needle body 2 is 15°, the maximum distance between the side wing 29 and the axis of the needle body 2 is equal to the outer diameter of the connecting section 23 of the needle body 2.
[0047] In a specific implementation, the needle body 2 has three wing holes 28, which are arranged in a circumferential array along the needle body 2. That is, the central angle between the axis of two adjacent side wings 29 is 120°. Correspondingly, side wings 29 are provided at the edges of the three wing holes 28, and the three side wings 29 form a triangular structure. In addition to having three wing holes 28 and three side wings 29, the number of wing holes 28 and side wings 29 can also be one, two, four or more, etc. This embodiment does not impose too many restrictions on this.
[0048] Preferably, the side wing 29 is integrally formed with the needle body 2.
[0049] This utility model also provides a connection terminal, including an end body for wrapping a wire and a self-sealing pin as described above. The pin head 1, the pin body 2 and the end body are arranged in sequence. The end body is connected to the pin body 2 and extends into the buffer chamber 25.
[0050] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.
Claims
1. A self-sealing pin, comprising a pin body for connection with a wire, wherein one end of the pin body is provided with a needle tip, and both the needle tip and the pin body are hollow structures and are in communication with each other, characterized in that, The needle body has an opening at the opposite end that communicates with its interior. The side of the needle body has a side hole. The edge of the side hole away from the needle tip and the edge of the opening are respectively provided with a stop. The two stops are each located on one side of the axis of the needle body and are bent to the opposite side of the axis of the needle body and abut against the inner wall of the needle body. The two stops are spaced apart and form a buffer chamber between the two stops.
2. The self-sealing insert according to claim 1, characterized in that, The stop on the edge of the side hole is located on the first side of the needle body, and the stop on the edge of the opening is located on the second side of the needle body. The first side and the second side of the needle body are respectively the opposite sides of the needle body.
3. The self-sealing insert according to claim 1, characterized in that, The inner wall of the needle body is provided with a limiting part that is opposite to the side hole, and the limiting part is used to abut against the stop on the side hole.
4. The self-sealing insert according to claim 3, characterized in that, The limiting portion extends circumferentially along the needle body to the edges of opposite sides of the side hole.
5. The self-sealing insert according to claim 4, characterized in that, The needle body includes a transition section and a connecting section. The needle tip, the transition section, and the connecting section are connected in sequence. The outer diameter of the transition section is smaller than the outer diameter of the connecting section. The limiting part is formed at the junction of the transition section and the connecting section. The side hole is opened at the junction of the transition section and the connecting section. The opening is located on the end of the connecting section away from the transition section. Both of the stops are located inside the connecting section.
6. The self-sealing insert according to any one of claims 1-5, characterized in that, The edge of the opening is also provided with a wiring part, which is located on both sides of the needle body opposite to the stop on the opening.
7. The self-sealing insert according to claim 6, characterized in that, The connector includes a first crimp pin and a second crimp pin, and the needle tip, the needle body, the first crimp pin and the second crimp pin are connected in sequence.
8. The self-sealing insert according to any one of claims 1-5, characterized in that, The needle body has a wing hole on its side, which is located between the needle tip and the side hole. The edge of the wing hole near the needle tip has a side wing for locking onto the inner wall of the connecting needle seat. The side of the side wing away from the needle tip is bent to the outside of the needle body.
9. The self-sealing insert according to claim 8, characterized in that, The edge of the wing is provided with a sharp blade for piercing the inner wall of the connecting needle seat.
10. A connecting terminal, comprising an end body for wrapping a wire and a self-sealing pin as described in any one of claims 1-9, characterized in that, The needle tip, the needle body, and the end body are arranged in sequence, with the end body connected to the needle body and extending into the buffer chamber.