Terminal block shielding structure with improved structure

Abstract

The utility model discloses a terminal block shielding structure with an improved structure, which comprises a metal shell and a shielding terminal, one end of a terminal block back to a circuit board welded with the terminal block is an upper end, the metal shell covers the surface of the upper end of an outer flange of the terminal block, and the metal shell is fixedly connected with the terminal block. The shielding terminal comprises a grounding pin and an elastic contact part, the shielding terminal can be fixedly installed on the terminal block outer side flange, the grounding pin can extend out of the terminal block outer side flange and is electrically connected with the circuit board to achieve grounding, and the elastic contact part can elastically deform up and down. According to the utility model, through the stable contact conduction between the metal housing and the elastic contact part of the shielding terminal, it is ensured that the shielding structure fully shields external interference signals, and the service life of the shielding structure is prolonged.

Description

Technical Field

[0001] This utility model relates to a pluggable terminal block, and more particularly to a terminal block shielding structure with improved structure. Background Technology

[0002] Currently, the conductive structure between the metal casing of the pluggable terminal block harness and the metal shielded terminals installed on the flanges on both sides is as follows: a nut is installed in the outer flange on both sides of the terminal block. One end of the shielded terminal extends into the outer flange and is in close contact with the nut. The other end of the shielded terminal forms a grounding foot for grounding. Both the shielded terminal and the metal casing have through holes. The bolt thread passes through the through hole on the metal casing, is inserted into the outer flange, and passes through the through hole at one end of the shielded terminal, and is finally screwed into the nut. That is, the grounding function is achieved indirectly through the threads of the bolt and nut. The conductive transmission method between the metal casing and the shielded terminal is: metal casing -- thread -- shielded terminal -- grounding. This structure leads to unstable grounding connection of the metal casing, which is prone to open circuit and affects the shielding effect of external interference signals. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides an improved terminal block shielding structure. This improved terminal block shielding structure provides stable electrical signal transmission, good shielding effect against external interference signals, and long service life.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an improved terminal block shielding structure, including a metal shell and shielding terminals. The end of the terminal block facing away from the circuit board welded to it is the upper end. The metal shell covers the upper surface of the outer flange of the terminal block and is fixedly connected to the terminal block. The shielding terminal includes a grounding foot and an elastic contact part. The shielding terminal can be fixedly installed on the outer flange of the terminal block. The grounding foot can extend outside the outer flange of the terminal block and be electrically connected to the circuit board to achieve grounding. The elastic contact part can be elastically deformed up and down, and the elastic contact part can extend out of the upper surface of the outer flange of the terminal block and press against the lower surface of the metal shell.

[0005] As a further improvement of this utility model, at least one retaining groove is provided on the side wall of the outer flange of the terminal block, and the shielding terminal is provided with a retaining part corresponding to the retaining groove. Each retaining part can be inserted into the retaining groove in a corresponding manner. The side wall of the retaining part of the shielding terminal is provided with several protruding barb structures. The protruding barb structures can be embedded in the inner side wall of the retaining groove to realize the fixed connection between the retaining part of the shielding terminal and the outer flange of the terminal block.

[0006] As a further improvement of this utility model, the shielding terminal also includes an L-shaped terminal body, which covers the upper surface and side surface of the outer flange of the terminal block. The elastic contact part is an elastic arm structure that is bent upward at one end of the L-shaped terminal body covering the upper surface of the outer flange of the terminal block. The retaining part is a sheet-like structure that is bent horizontally at one end of the L-shaped terminal body covering the side surface of the outer flange of the terminal block. The grounding foot is an L-shaped structure located at one end of the L-shaped terminal body covering the side surface of the outer flange of the terminal block.

[0007] As a further improvement of this utility model, the two retaining parts are symmetrically distributed on both sides of the grounding foot.

[0008] As a further improvement of this utility model, the upper surface and side surface of the outer flange of the terminal block are also provided with receiving grooves that match the L-shaped terminal body of the shielding terminal, and the L-shaped terminal body of the shielding terminal can be accommodated in the receiving grooves.

[0009] As a further improvement of this utility model, the upper surface of the outer flange of the terminal block is also provided with a relief groove that is directly opposite to the elastic contact part of the shielding terminal. The elastic contact part of the shielding terminal can be accommodated in the relief groove when it is pressed downward.

[0010] As a further improvement of this utility model, the elastic contact portion of the shielding terminal is located at the end of the elastic arm structure and forms a downwardly bent arc contact surface.

[0011] As a further improvement of this utility model, the metal shell is provided with a connecting through hole, a connecting nut is fixedly provided inside the outer flange of the terminal block, and the outer flange of the terminal block is also provided with a clearance through hole facing the connecting nut. The L-shaped terminal body of the shielding terminal is also provided with a clearance notch facing the connecting nut. A connecting bolt is also provided. The stud of the connecting bolt passes through the connecting through hole on the metal shell, the clearance notch on the L-shaped terminal body of the shielding terminal and the clearance through hole on the outer flange of the terminal block and is finally screwed and locked with the connecting nut so that the metal shell is fixedly connected to the outer flange of the terminal block.

[0012] As a further improvement of this utility model, the L-shaped terminal body of the shielding terminal covers one end of the upper surface of the outer flange of the terminal block to form a V-shaped structure. One arm of the V-shaped structure is flat against the upper surface of the outer flange of the terminal block, and the other arm of the V-shaped structure is bent to form an elastic contact part. Concave clearance notches are formed on the opposite sidewalls of the two arms of the V-shaped structure.

[0013] As a further improvement of this utility model, the terminal block is provided with an outer flange at each end along the direction of its inner terminal arrangement, and two shielding terminals are respectively installed on the two outer flanges. The metal shell is sleeved on the outside of the terminal block and completely covers the terminals of the terminal block extending above the pins on the outside of the terminal block and above the shielding terminals.

[0014] The beneficial technical effects of this utility model are as follows: This utility model achieves a fixed connection between the shielding terminal and the outer flange of the terminal block by setting a retaining part on the shielding terminal, and achieves conduction by setting an elastic contact part on the shielding terminal that can elastically deform up and down and directly making elastic contact with the metal shell, thereby achieving a grounding effect. This utility model also provides positive pressure to the elastic contact part between the metal shell and the shielding terminal by tightening the connecting bolts and connecting nuts, ensuring stable contact and conduction between the elastic contact part between the metal shell and the shielding terminal, ensuring that the shielding structure fully shields external interference signals, and improving the service life of the shielding structure. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of existing technology;

[0016] Figure 2 This is a schematic diagram of the structural principle of this utility model;

[0017] Figure 3 This is a perspective view of the shielding terminal of this utility model installed on the outer flange of the terminal block;

[0018] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0019] Figure 5 This is a perspective view of the shielding structure of this utility model;

[0020] Figure 6 This is a first perspective view of the shielding terminal of this utility model;

[0021] Figure 7 This is a second perspective view of the shielding terminal of this utility model. Detailed Implementation

[0022] Example: An improved shielding structure for a terminal block 3 includes a metal housing 1 and shielding terminals 2. The end of the terminal block 3 facing away from the circuit board it is welded to is the upper end. The metal housing 1 covers the upper surface of the outer flange 4 of the terminal block and is fixedly connected to the terminal block 3. The shielding terminals 2 include a grounding foot 22 and an elastic contact portion 23. The shielding terminals 2 can be fixedly installed on the outer flange 4 of the terminal block. The grounding foot 22 can extend outside the outer flange 4 of the terminal block and be electrically connected to the circuit board to achieve grounding. The elastic contact portion 23 can elastically deform up and down and can extend out of the upper surface of the outer flange 4 of the terminal block and press against the lower surface of the metal housing 1.

[0023] This structure fixes both the shielding terminal 2 and the metal housing 1 on the outer flange of the terminal block 3. The elastic contact part 23 on the shielding terminal 2 is pressed tightly against the lower end face of the metal housing 1, so that the metal housing 1 is in direct contact with the shielding terminal 2 and conduction is ensured. This ensures the stability of the grounding signal and guarantees the stable shielding effect of the terminal block 3 against external interference signals. This structure can also maintain stable contact between the metal housing 1 and the shielding terminal 2 during long-term use, resulting in a long service life.

[0024] At least one retaining groove 41 is provided on the side wall of the outer flange 4 of the terminal block. The shielding terminal 2 is provided with a retaining part 21 corresponding to the retaining groove 41. Each retaining part 21 can be inserted into the retaining groove 41. The side wall of the retaining part 21 of the shielding terminal 2 is provided with several protruding barb structures 211. The protruding barb structures 211 can be embedded in the inner side wall of the retaining groove 41 to fix the retaining part 21 of the shielding terminal 2 to the outer flange 4 of the terminal block. After the shielding terminal 2 is inserted into the retaining groove 41 on the outer flange 4 of the terminal block through the retaining part 21, the barb structures 211 on the side wall of the retaining part 21 are embedded in the inner side wall of the retaining groove 41 on the outer flange 4 of the terminal block to fix and position the shielding terminal 2 to the outer flange 4 of the terminal block. In addition, the shielding terminal 2 can also be fixedly connected to the outer flange 4 of the terminal block in other ways, such as in-mold injection molding, fastening by snap-fit, or fixed connection by connectors, etc.

[0025] The shielding terminal 2 also includes an L-shaped terminal body 24, which covers the upper surface and side surface of the outer flange 4 of the terminal block. The elastic contact part 23 is an elastic arm structure that is bent upward at one end of the L-shaped terminal body 24 covering the upper surface of the outer flange 4 of the terminal block. The retaining part 21 is a sheet-like structure that is bent horizontally at one end of the L-shaped terminal body 24 covering the side surface of the outer flange 4 of the terminal block. The grounding foot 22 is an L-shaped structure located at one end of the L-shaped terminal body 24 covering the side surface of the outer flange 4 of the terminal block. The shielding terminal 2 is made by directly stamping and bending metal sheet. The terminal body 24 covers the outside of the outer flange 4 of the terminal block, ensuring a stable connection between the shielding terminal 2 and the outer flange 4 of the terminal block.

[0026] The two retaining parts 21 are symmetrically distributed on both sides of the grounding foot 22. The symmetrically arranged retaining parts 21 can improve the connection stability between the shielding terminal 2 and the outer flange 4 of the terminal block.

[0027] The outer flange 4 of the terminal block is further provided with receiving grooves 42 on its upper surface and side surface, which match the L-shaped terminal body 24 of the shielding terminal 2. The L-shaped terminal body 24 of the shielding terminal 2 can be accommodated in the receiving grooves 42. By accommodating the L-shaped terminal body 24 of the shielding terminal 2 in the receiving grooves 42, it is prevented from being exposed on the surface of the outer flange 4 of the terminal block, thus avoiding interference with other parts, and further positioning of the shielding terminal 2 is also possible.

[0028] The upper surface of the outer flange 4 of the terminal block is also provided with a relief groove 43 that faces the elastic contact portion 23 of the shielding terminal 2. The elastic contact portion 23 of the shielding terminal 2 can be accommodated in the relief groove 43 when pressed downward. The above structure allows the elastic contact portion 23 of the shielding terminal 2 to elastically swing over a large range, improving contact stability.

[0029] The elastic contact portion 23 of the shielding terminal 2 is located at the end of the elastic arm structure and forms a downwardly bent arc contact surface 231 to prevent scratching the lower end face of the metal shell 1.

[0030] The metal housing 1 has a connecting through hole, and a connecting nut 6 is fixedly installed inside the outer flange 4 of the terminal block. The outer flange 4 of the terminal block also has a clearance through hole opposite to the connecting nut 6. The L-shaped terminal body 24 of the shielding terminal 2 also has a clearance notch 241 opposite to the connecting nut 6. A connecting bolt 5 is also provided. The stud of the connecting bolt 5 passes through the connecting through hole on the metal housing 1, the clearance notch 241 on the L-shaped terminal body 24 of the shielding terminal 2, and the clearance through hole on the outer flange 4 of the terminal block, and is finally screwed and locked with the connecting nut 6, so that the metal housing 1 and the outer flange 4 of the terminal block are fixedly connected. The locking of the connecting bolt 5 and the connecting nut 6 provides positive pressure between the metal housing 1 and the shielding terminal 2, and fixes the metal housing 1 on the terminal block 3.

[0031] The L-shaped terminal body 24 of the shielding terminal 2 covers one end of the upper surface of the outer flange 4 of the terminal block to form a V-shaped structure. One arm of the V-shaped structure is flat against the upper surface of the outer flange of the terminal block, and the other arm of the V-shaped structure is bent to form an elastic contact part 23. Concave clearance notches 241 are formed on the opposite sidewalls of the two arms of the V-shaped structure, respectively.

[0032] The terminal block 3 has an outer flange at each end along the direction of its inner terminal arrangement. Two shielded terminals 2 are respectively installed on the two outer flanges. The metal shell 1 is fitted on the outside of the terminal block 3 and completely covers each terminal of the terminal block 3 extending above the pins on the outside of the terminal block 3 and above the shielded terminals 2.

Claims

1. An improved terminal block shielding structure, comprising a metal shell (1) and shielding terminals (2), wherein the end of the terminal block (3) facing away from the circuit board to which it is welded is the upper end, and the metal shell covers the upper surface of the outer flange (4) of the terminal block, characterized in that: The metal shell is fixedly connected with the terminal table, the shielding terminal comprises a grounding leg (22) and an elastic contact part (23), the shielding terminal can be fixedly installed on the flange outside the terminal table, the grounding leg can extend outside the flange outside the terminal table and be electrically connected with the circuit board to realize grounding, and the elastic contact part can be elastically deformed up and down, and the elastic contact part can extend out of the upper end surface of the flange outside the terminal table and abut against the lower end surface of the metal shell.

2. The structurally improved terminal block shielding structure according to claim 1, characterized in that: At least one holding groove (41) is arranged on the side wall of the flange outside the terminal table, the shielding terminal is provided with a holding part (21) corresponding to the holding groove, each holding part is inserted into the holding groove in one-to-one correspondence, a plurality of protruding barb structures (211) are arranged on the side wall of the holding part of the shielding terminal, and the protruding barb structures are embedded on the inner side wall of the holding groove to realize fixed connection of the holding part of the shielding terminal and the flange outside the terminal table.

3. The structurally improved terminal block shielding structure according to claim 2, characterized in that: The shielding terminal further comprises an L-shaped terminal body (24), the L-shaped terminal body is covered on the upper end surface and the side surface of the flange outside the terminal table, the elastic contact part is an elastic arm structure that is inclined and bent upward from one end of the L-shaped terminal body covered on the upper end surface of the flange outside the terminal table, the holding part is a sheet structure that is horizontally bent from one end of the L-shaped terminal body covered on the side surface of the flange outside the terminal table, and the grounding leg is an L-shaped structure arranged on one end of the L-shaped terminal body covered on the side surface of the flange outside the terminal table.

4. The structurally improved terminal block shielding structure according to claim 3, characterized in that: The two holding parts are symmetrically distributed on both sides of the grounding leg.

5. The structurally improved terminal block shielding structure according to claim 3, characterized in that: An accommodating groove (42) matched with the L-shaped terminal body of the shielding terminal is further arranged on the upper end surface and the side surface of the flange outside the terminal table, and the L-shaped terminal body of the shielding terminal can be accommodated in the accommodating groove.

6. The structurally improved terminal block shielding structure according to claim 3, characterized in that: An avoiding groove (43) opposite to the elastic contact part of the shielding terminal is further arranged on the upper end surface of the flange outside the terminal table, and the elastic contact part of the shielding terminal can be accommodated in the avoiding groove when moving downward under pressure.

7. The structurally improved terminal block shielding structure according to claim 3, characterized in that: A downwardly bent circular arc contact surface (231) is formed at the end of the elastic arm structure of the elastic contact part of the shielding terminal.

8. The structurally improved terminal block shielding structure according to claim 3, characterized in that: A connecting through hole is arranged on the metal shell, a connecting nut (6) is fixedly arranged in the flange outside the terminal table, an avoiding through hole opposite to the connecting nut is further arranged on the flange outside the terminal table, an avoiding notch (241) opposite to the connecting nut is further arranged on the L-shaped terminal body of the shielding terminal, and a connecting bolt (5) is further arranged, the shank of the connecting bolt passes through the connecting through hole on the metal shell, the avoiding notch on the L-shaped terminal body of the shielding terminal and the avoiding through hole on the flange outside the terminal table, and finally is screwed and locked with the connecting nut to realize fixed connection of the metal shell and the flange outside the terminal table.

9. The structurally improved terminal block shielding structure according to claim 8, characterized in that: One end of the L-shaped terminal body of the shielding terminal covers the upper end surface of the flange outside the terminal table to form a V-shaped structure, one side arm of the V-shaped structure is flatly arranged on the upper end surface of the flange outside the terminal table, the other side arm of the V-shaped structure forms the elastic contact part through bending, and the opposite side walls of the two side arms of the V-shaped structure respectively form recessed avoiding notches.

10. The structurally improved terminal block shielding structure of claim 1, characterized by: The terminal base is provided with an outer flange at each end along the direction of arrangement of the inner terminals, and two shield terminals are mounted on the two outer flanges respectively, and a metal shell is sleeved on the outer side of the terminal base and covers completely the pins of the terminals and the shield terminals.

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