A board-end electrical connector suitable for PTC heater

Abstract

The present invention relates to a board-end electrical connector suitable for a PTC heater, comprising a main plastic part, a fixed plastic part and a wiring terminal. A first accommodating cavity is provided in the main plastic part along its length direction for the insertion of the fixed plastic part. A plurality of second accommodating cavities are provided in the fixed plastic part along its length direction. The wiring terminal is connected to the cable and inserted and fixed into the second accommodating cavity. At least one elastic limiting wing is provided on the wiring terminal around its side wall, and correspondingly, a limiting block adapted to the elastic limiting wing is provided in the second accommodating cavity. In this way, the wiring terminal is effectively prevented from falling out of the fixed plastic part, thereby ensuring the reliability of the connection between the two, and further ensuring the reliability and stability of the signal transmission, and ensuring that the PTC heater always remains in a normal working state.

Description

Technical Field

[0001] The invention relates to the technical field of electric connectors, in particular to a board-end electric connector suitable for a PTC heater. Background Art

[0002] Electrical connectors are widely used in automobiles, communications and various industrial fields. Electrical connectors are important functional components for completing switching and signal transmission, and they try their best to ensure that signals are not distorted or lost during transmission. Among them, board-side electrical connectors are used in conjunction with PCB boards.

[0003] The board-end electrical connector is mainly composed of several parts, such as a main plastic part, a fixed plastic part and a wiring terminal. Generally speaking, the fixed plastic part is inserted into the main plastic part, and a plurality of accommodating cavities for the above-mentioned wiring terminals are opened along its length direction. The wiring terminals are connected to the cables to realize the function of signal transmission. In actual use, the cables will inevitably be affected by external pulling forces, which will cause the wiring terminals to loosen in the accommodating cavity, thereby affecting the stability and reliability of signal transmission. In severe cases, they will directly fall out of the accommodating cavity, thereby interrupting the signal transmission process. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a board-end electrical connector suitable for a PTC heater which has a simple structural design, is easy to manufacture and implement, and avoids the phenomenon of terminal stripping.

[0005] In order to solve the above technical problems, the present invention relates to a board-end electrical connector suitable for a PTC heater, including a main plastic part, a fixed plastic part and a wiring terminal. A first accommodating cavity is provided in the main plastic part along its length direction, for the above fixed plastic part to be inserted from right to left. A plurality of second accommodating cavities are provided in the fixed plastic part along its length direction. The wiring terminal is connected to the cable and is inserted and fixed into the above second accommodating cavity from right to left. At least one elastic limit wing is provided on the wiring terminal around its side wall, and correspondingly, a limit block adapted to the above elastic limit wing is provided in the second accommodating cavity.

[0006] As a further improvement of the technical solution of the present invention, the limiting block is integrally formed with the fixed plastic part and is formed by radially extending from the side wall of the second accommodating cavity.

[0007] As a further improvement of the technical solution of the present invention, a left-leaning guide slope is provided on the limit block.

[0008] As a further improvement of the technical solution of the present invention, the board-end electrical connector suitable for the PTC heater also includes a transverse limiter. A limit groove is provided on the terminal on the side opposite to the elastic limiter wing. A transverse slot matching the shape of the transverse limiter is provided on the fixed plastic part. The transverse slot extends along the front-to-back direction and communicates with the second accommodating cavity. When the terminal is placed in place in the second accommodating cavity, the transverse slot is aligned with the limit groove.

[0009] As a further improvement of the technical solution of the present invention, at least one abutting convex strip is arranged around the side wall and on the transverse limit member.

[0010] As a further improvement of the technical solution of the present invention, the main plastic part and the fixed plastic part are connected by snap-fitting. At least two snap-fitting protrusions extend outward from the side wall of the fixed plastic part and are symmetrically arranged. Correspondingly, a snap-fitting notch that matches the above snap-fitting protrusions extends outward along the side wall of the first accommodating cavity.

[0011] As a further improvement of the technical solution of the present invention, at least one limiting protrusion continues to extend outward from the side wall of the fixed plastic part, and correspondingly, a guide notch adapted to the above-mentioned limiting protrusion extends outward along the side wall of the first accommodating cavity.

[0012] As a further improvement of the technical solution of the present invention, the board-end electrical connector suitable for PTC heaters also includes a sealing ring, which is pressed against the assembly surface of the main plastic part. The assembly surface of the main plastic part is provided with an installation groove that matches the shape of the sealing ring.

[0013] As a further improvement of the technical solution of the present invention, an anti-slip lug is provided on the sealing ring. The number of the anti-slip lugs is set to at least 2 and is evenly distributed around the periphery of the sealing ring. Correspondingly, an anti-slip hook hole adapted to the anti-slip lug is opened on the assembly surface of the main plastic part.

[0014] As a further improvement of the technical solution of the present invention, the board-end electrical connector suitable for PTC heaters realizes its own detachable connection and fixation by means of bolts, and accordingly, a bolt through hole is opened on the main plastic part. In addition, the board-end electrical connector suitable for PTC heaters also includes a metal bushing, which is sleeved and installed in the bolt through hole.

[0015] Compared with the traditional design structure of the board-end electrical connector suitable for the PTC heater, in the technical solution disclosed in the present invention, the wiring terminal uses elastic limiting fins to achieve a fixed connection with the fixed plastic part, thereby effectively preventing the wiring terminal from falling out of the fixed plastic part, ensuring the reliability of the connection between the two, and further ensuring the reliability and stability of signal transmission, ensuring that the PTC heater always remains in a normal working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is an exploded schematic diagram of a board-end electrical connector suitable for a PTC heater in the present invention.

[0018] Figure 2 It is a three-dimensional assembly schematic diagram of a board-end electrical connector suitable for a PTC heater in the present invention.

[0019] Figure 3 yes Figure 2 Top view of the .

[0020] Figure 4 yes Figure 3 AA section view.

[0021] Figure 5 yes Figure 3 BB cross-sectional view.

[0022] Figure 6 yes Figure 3 CC cross-sectional view.

[0023] Figure 7 yes Figure 2 main view.

[0024] Figure 8 yes Figure 7 DD cross-sectional view.

[0025] Fig. 9 yes Figure 7 EE cross-sectional view.

[0026] Fig.10 It is a three-dimensional schematic diagram of the main plastic part of the board-end electrical connector suitable for a PTC heater according to the present invention.

[0027] Fig.11It is a three-dimensional schematic diagram of a fixed plastic part in a board-end electrical connector suitable for a PTC heater according to the present invention.

[0028] Fig.12 yes Fig.11 Top view of the .

[0029] Fig.13 yes Fig.12 FF cross-sectional view.

[0030] Fig.14 yes Fig.12 GG cross-sectional view.

[0031] Fig.15 The present invention is a three-dimensional schematic diagram of a wiring terminal in a board-end electrical connector suitable for a PTC heater.

[0032] Fig.16 It is a three-dimensional schematic diagram of a transverse limiter in a board-end electrical connector suitable for a PTC heater according to the present invention.

[0033] Fig.17 It is a three-dimensional schematic diagram of a sealing ring in a board-end electrical connector suitable for a PTC heater according to the present invention.

[0034] Fig.18 It is a three-dimensional schematic diagram of a metal bushing in a board-end electrical connector suitable for a PTC heater according to the present invention.

[0035] 1-Main plastic part; 11-First accommodating cavity; 111-Snap-on notch; 112-Guide notch; 12-Installation groove; 13-Anti-drop hook hole; 14-Bolt through hole; 2-Fixed plastic part; 21-Second accommodating cavity; 211-Limiting block; 2111-Left-leaning guide slope; 22-Horizontal slot; 23-Snap-on protrusion; 24-Limiting protrusion; 3-Connecting terminal; 31-Elastic limiting wing; 32-Limiting groove; 4-Horizontal limiting piece; 41-Top convex strip; 5-Sealing ring; 51-Anti-drop lug; 6-Metal bushing. DETAILED DESCRIPTION

[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0037] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 , Figure 2The exploded schematic diagram and the three-dimensional exploded diagram of the board-end electrical connector suitable for the PTC heater in the present invention are respectively shown. It can be seen that it is mainly composed of several parts such as a main plastic part 1, a fixed plastic part 2 and a wiring terminal 3. Among them, along the length direction (i.e. the left-right direction in the figure), a first accommodating cavity 11 adapted to the shape of the above-mentioned fixed plastic part 2 is opened in the main plastic part 1, so that the fixed plastic part 2 can be inserted from right to left. Along the length direction (i.e. the left-right direction in the figure), a plurality of second accommodating cavities 21 are opened in the fixed plastic part 2. The wiring terminal 3 is connected to the cable and is inserted and fixed in the above-mentioned second accommodating cavity 21 from right to left. At least one elastic limit wing 31 is arranged on the wiring terminal 3 around its side wall, and correspondingly, a limit block 211 (such as a limit block 211) adapted to the above-mentioned elastic limit wing 31 is arranged in the second accommodating cavity 21. Figure 3 , 4 , 10, 12, 13, and 15). In this way, when the cable is subjected to a pulling force, the presence of the limit block 211 and the elastic limit wing 31 can effectively prevent the terminal 3 from axially displacing along the left-right direction, thereby effectively preventing the terminal 3 from coming out of the fixed plastic part 2, ensuring the reliability of the connection between the two, and further ensuring the reliability and stability of signal transmission, ensuring that the PTC heater always remains in a normal working state.

[0038] In order to reduce the manufacturing cost and ensure the fixing reliability of the limit block 211, the limit block 211 is preferably integrally injection molded with the fixed plastic part 2 and is formed by radially extending the side wall of the second accommodating cavity 21 (such as Fig.13 ).

[0039] Furthermore, in order to ensure that the elastic limiting wing 31 passes over the limiting block 211 more smoothly and reduce the difficulty of mating, a left-leaning guiding inclined surface 2111 (such as Fig.13 Generally speaking, the inclination angle of the left-leaning guide slope 2111 is preferably controlled at 45-60° to achieve better application effects.

[0040] As a further optimization of the above-mentioned technical solution of the board-end electrical connector suitable for PTC heaters, a transverse limiter 4 can also be added according to specific application scenarios and testing standards. A limiting groove 32 is provided on the terminal 3 on the side opposite to the elastic limiting wing 31. A transverse slot 22 adapted to the shape of the above-mentioned transverse limiter 4 is provided on the fixed plastic part 2. The transverse slot 22 extends along the front-to-back direction and communicates with the above-mentioned second accommodating cavity 21. And when the terminal 3 is placed in the second accommodating cavity 21, the transverse slot 22 is aligned with the limiting groove 32. When the transverse limiter 4 passes through the transverse slot 22 to complete the assembly process with the fixed plastic part 2, it is placed in the limiting groove 32 (such as Figure 1 , 2 , 3, 4, 5, 7, 9, 10, 11, 12, 13, 14, and 16). The elastic limiting wing 31 and the limiting block 211 cooperate with each other as a first anti-slip protection, and the transverse limiting member 4 and the limiting groove 32 cooperate with each other as a second anti-slip protection, thereby effectively limiting the displacement of the terminal 3 in the left and right directions, thereby further preventing the terminal 3 from slipping out of the fixed plastic part 2.

[0041] Furthermore, as a further optimization of the above technical solution, at least one abutting convex strip 41 (such as Fig.16 In this way, under the premise of ensuring that the transverse limiting member 4 is smoothly inserted into the fixed plastic member 2, when the transverse limiting member 4 is inserted into the fixed plastic member 2, the protruding strip 41 can undergo a certain amount of adaptive elastic deformation, thereby effectively eliminating the assembly gap between the transverse limiting member 4 and the transverse slot 22, thereby ensuring the assembly stability of the transverse limiting member 4 and preventing the "slipping" phenomenon.

[0042] It should be noted that, according to actual conditions, various design structures can be adopted to achieve the fixed connection between the main plastic part 1 and the fixed plastic part 2. However, in this embodiment, an optimal design form is recommended, which is as follows: the main plastic part 1 and the fixed plastic part 2 are connected by a snap-fit ​​method. At least two snap-fit ​​protrusions 23 extend outward from the side wall of the fixed plastic part 2 and are arranged symmetrically. Correspondingly, a snap-fit ​​notch 111 (such as a snap-fit ​​notch 111) adapted to the snap-fit ​​protrusions 23 extends outward from the side wall of the first accommodating cavity 11. Figure 1 , 2, 7, 8, 10, and 11). In this way, on the one hand, the main plastic part 1 and the fixed plastic part 2 have a relatively simple design structure, which is conducive to their manufacture and molding; on the other hand, it is convenient to assemble the fixed plastic part 2 into the main plastic part 1, which is conducive to reducing the assembly pressure; more importantly, by adopting the above technical solution, the fixed plastic part 2 is not easy to fall out of the main plastic part 1, ensuring the reliability of the connection between the two.

[0043] In order to ensure the "foolproof" operation of assembly, at least one limiting protrusion 24 can be further extended outward from the side wall of the fixed plastic part 2, and correspondingly, a guide notch 112 (such as a guide notch 112) adapted to the above-mentioned limiting protrusion 24 is extended outward along the side wall of the first accommodating cavity 11. Figure 1 , 2 , 3, 5, 7, 8, 10, 11, 12, and 13). In the actual assembly process, by adjusting the relative position relationship of the limiting protrusion 24 with respect to the guide notch 112, the alignment accuracy of the fixed plastic part 2 with respect to the main plastic part 1 can be effectively ensured, thereby ensuring that the clamping protrusion 23 slides into the clamping notch 111 just right, thereby reducing the difficulty of plugging and fitting the fixed plastic part 2.

[0044] In the prior art, there is a lack of effective sealing measures between the board-end electrical connector and the corresponding electrical control cabinet mounting substrate, and water or water vapor will inevitably enter the interior of the electrical control cabinet through the gap at the joint, thereby affecting the service life of the electrical control cabinet and the stability and reliability of signal and current transmission. In view of this, the board-end electrical connector suitable for PTC heaters can also be additionally provided with a sealing ring 5, which is pressed against the assembly surface of the main plastic part 1 (such as Figure 1 , 2 , 3, 4, 5, 7, and 9).

[0045] In addition, in order to ensure the consistency of the relative installation position of the sealing ring 5 and prevent it from being misplaced during actual application, a mounting groove 12 (such as Fig.10 ).

[0046] Furthermore, as a further optimization of the above technical solution, an anti-drop lug 51 may be provided on the sealing ring 5. The number of the anti-drop lugs 51 is at least 2 and is evenly distributed around the periphery of the sealing ring 5. Correspondingly, an anti-drop hook hole 13 (such as 130) adapted to the anti-drop lug 51 is provided on the assembly surface of the main plastic part 1. Figure 1 , 2, 7, 9, and 17). In this way, before the board-side electrical connector is installed in the electric control cabinet, the sealing ring 5 can be inserted and fixed on the main plastic part 1 in advance, thereby effectively reducing the difficulty of assembling the sealing ring 5 and ensuring the alignment accuracy of the sealing ring 5 relative to the main plastic part 1.

[0047] In order to reduce the difficulty of disassembling and assembling the board-end electrical connector, it is preferred to use bolts to achieve its own detachable connection and fixation. Accordingly, a bolt through hole 14 (such as Figure 1 , 2 , 3, 6, and 10).

[0048] As is known, the main plastic part 1 itself has a relatively low structural strength. Therefore, when the bolt is tightened, it will inevitably be subjected to compression damage. In view of this, a metal bushing 6 can be added according to actual conditions. The metal bushing 6 is sleeved and installed in the above-mentioned bolt through hole 14 (such as Figure 1 , 2 , 3, 6, and 18). In this way, the bolt tightening force is borne by the metal bushing 6, thereby effectively preventing the occurrence of the phenomenon of pressure damage to the main plastic part 1.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A board-end electrical connector suitable for a PTC heater, comprising a main body plastic part, a fixed plastic part and a terminal; a first accommodating cavity is provided in the main body plastic part along its length direction, for the fixed plastic part to be inserted from right to left; a plurality of second accommodating cavities are provided in the fixed plastic part along its length direction; the terminal is connected to a cable and is inserted and fixed into the second accommodating cavity from right to left, characterized in that: At least one elastic limiting wing is arranged around the side wall and on the connecting terminal, and correspondingly, a limiting block adapted to the elastic limiting wing is arranged in the second accommodating cavity; The board-end electrical connector suitable for the PTC heater also includes a transverse limiter; a limit groove is provided on the wiring terminal on a side opposite to the elastic limiter wing; a transverse slot adapted to the shape of the transverse limiter is provided on the fixed plastic part; the transverse slot extends along the front-back direction and communicates with the second accommodating cavity; and when the wiring terminal is placed in place in the second accommodating cavity, the transverse slot is aligned with the limit groove; At least one supporting convex strip is arranged on the transverse limiting member around its side wall; when the transverse limiting member is inserted into the fixed plastic member, the supporting convex strip is adaptively elastically deformed due to the extrusion force, and the assembly gap between the transverse limiting member and the transverse slot is eliminated; The board-end electrical connector suitable for the PTC heater realizes its own detachable connection and fixation by means of bolts, and accordingly, a bolt through hole is opened on the main plastic part; the board-end electrical connector suitable for the PTC heater also includes a metal bushing, which is sleeved and installed in the bolt through hole.

2. The board-end electrical connector suitable for a PTC heater according to claim 1, characterized in that: The limiting block is integrally formed with the fixed plastic component and is formed by radially extending the side wall of the second accommodating cavity.

3. The board-end electrical connector suitable for a PTC heater according to claim 2, characterized in that: A left-leaning guide slope is arranged on the limit block.

4. The board-end electrical connector suitable for a PTC heater according to claim 1, characterized in that: The main plastic part and the fixed plastic part are connected by snap-fitting; at least two snap-fitting protrusions extend outward from the side wall of the fixed plastic part and are symmetrically arranged; correspondingly, a snap-fitting notch that matches the snap-fitting protrusions extends outward along the side wall of the first accommodating cavity.

5. The board-end electrical connector suitable for a PTC heater according to claim 4, characterized in that: At least one limiting protrusion is further extended outward from the side wall of the fixed plastic part, and correspondingly, a guide notch matched with the limiting protrusion is extended outward along the side wall of the first accommodating cavity.

6. The board-end electrical connector suitable for a PTC heater according to claim 1, characterized in that: It also includes a sealing ring which is pressed against the assembly surface of the main plastic part; and a mounting groove which matches the shape of the sealing ring is provided on the assembly surface of the main plastic part.

7. The board-end electrical connector suitable for a PTC heater according to claim 6, characterized in that: The sealing ring is provided with an anti-slip lug; the number of the anti-slip lugs is at least 2 and is evenly distributed around the periphery of the sealing ring; Correspondingly, an anti-drop hook hole matched with the anti-drop lug is provided on the assembly surface of the main plastic part.

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