A connection terminal and an electromechanical component having the connection terminal

Abstract

The present invention relates to a terminal block and an electromechanical component having the terminal block, wherein the terminal block comprises a nut frame, a screw column and a copper busbar, wherein the nut frame is provided with an insertion hole, and the copper busbar is provided with a convex column roughly matching the appearance of the insertion hole, and the nut frame is supported by a bracket, and the convex column on the copper busbar is inserted into the insertion hole of the nut frame to realize the limiting relationship between the nut frame and the copper busbar, so that the nut frame has a certain shaking margin relative to the copper busbar, and when the wiring wire inserted into the nut frame is a soft multi-strand copper stranded wire, the shaking of the nut frame itself offsets the propulsion force of the multi-strand copper stranded wire, thereby reducing the impact on the copper busbar. At the same time, the terminal block realizes a screw-free assembly method, further simplifies the production process and difficulty, and reduces the production cost.

Description

Technical Field

[0001] The present invention relates to a wiring terminal for electromechanical components, and in particular to a wiring terminal which can be used for both hard wiring wires and soft multi-strand wiring wires. Background Art

[0002] Circuit breakers, especially circuit breakers used in distribution boxes, have terminals with a structure similar to that of the attached patent US4603376A. Figure 1 As shown, it includes a nut frame, a screw column, a fastening screw and an incoming copper bar. The incoming copper bar is electrically connected to the contact conductive system inside the circuit breaker. The nut frame is inserted into the incoming copper bar. The fastening screw locks the nut frame and the incoming copper bar from bottom to top. The screw column is screwed on the nut frame and can be rotated to press the wiring wire inserted into the nut frame and the incoming copper bar from top to bottom. The defects of this common terminal structure are:

[0003] 1. It is necessary to use fastening screws to screw the nut frame and the incoming copper bar, and the assembly process is complicated;

[0004] 2. When fastening screws are used, if the fastening screws are tilted with the nut frame during installation, the contact surface between the nut frame and the incoming copper bar will be uneven, resulting in a reduction in the contact surface between the two, increasing resistance, generating high temperature and affecting the strength of the material;

[0005] 3. Since the temperature of the conductive circuit will change with the different power consumption, when fastening screws are used, the thread fixation of the fastening screws and the incoming copper busbar will loosen due to thermal expansion and contraction, causing the nut frame and the incoming copper busbar to loosen and have poor contact;

[0006] 4. The nut frame and the incoming copper bar are rigidly fixed together, which is usually only suitable for wiring wires with hard connection parts (flattened wire ends or riveted copper sheets) at the ends, but not suitable for occasions where the wiring wires are soft wires. Since the incoming copper bar and the outer shell of the circuit breaker are usually assembled together with a matching clearance, there is a certain amount of shaking, especially for the L-shaped incoming copper bar, the shaking is more obvious. In the current terminal structure, the nut frame and the incoming copper bar are rigidly fixed. When the wiring wire inserted into the nut frame is a soft multi-strand copper stranded wire, the multi-strand copper stranded wire is easy to push the nut frame when inserted into the nut frame, which causes the incoming copper bar to shake, affecting the mechanical parameters of the contact conductive system inside the circuit breaker (such as overtravel, contact end pressure), and even causing the circuit breaker to fail to work normally. Summary of the invention

[0007] Therefore, in view of the above problems, the present invention provides a wiring terminal with optimized structure and an electromechanical component having the wiring terminal.

[0008] The present invention is implemented by the following technical solutions:

[0009] The present invention proposes a wiring terminal, comprising a nut frame, a screw column and a wiring copper bar, wherein the screw column is screwed on the nut frame and can be rotated to extend into the interior of the nut frame, wherein one end of the screw column screwed on the nut frame is defined as the upper end, and the other end facing away is defined as the lower end, the lower end of the nut frame is supported on the bracket, a socket is provided on the nut frame, a convex column roughly matching the shape of the socket is provided on the wiring copper bar, and the wiring copper bar is inserted into the interior of the nut frame so that the lower end of the nut frame is located between the bracket and the wiring copper bar and the convex column is inserted into the socket, thereby roughly limiting the nut frame.

[0010] Wherein, the substantially limiting of the nut frame is performed in a manner of having a swing margin.

[0011] In order to ensure that the nut frame has sufficient swing margin and is appropriately limited, the matching clearance between the boss and the insertion hole is preferably between 0.3 mm and 1 mm.

[0012] To prevent the nut frame from shaking in its height direction and thus affecting the stability of the electrical connection between the wiring wires and the wiring copper busbar, in one embodiment, the thickness of the lower end of the nut frame is equivalent to the spacing height between the bracket and the wiring copper busbar.

[0013] In order to further twist the wiring conductors onto the wiring copper busbar, increase the anti-pull-out force of the wiring conductors, and ensure the reliability of the wiring, in one embodiment, the wiring copper busbar has a slotted hole at a position directly opposite to the screw column.

[0014] In order to increase the pressing force of the screw column, in one embodiment, the screw column is in a gradually shrinking cone shape toward one end of the wiring copper busbar.

[0015] In order to further twist the wiring conductors onto the wiring copper busbar, increase the anti-pull-out force of the wiring conductors, and ensure the reliability of the wiring, in one embodiment, an annular groove is formed on the end surface of the screw column facing one end of the wiring copper busbar.

[0016] To improve processability and save materials, in one embodiment, the slot is a through hole, and the center of the slot coincides with the center of the boss.

[0017] Among them, in order to further strengthen the support of the wiring copper busbar and enhance the stability of the structure, in one embodiment, the bracket has a stepped structure, including a first step surface and a second step surface forming a drop, the wiring copper busbar is supported on the first step surface, and the bottom of the nut frame is supported on the second step surface.

[0018] Based on the above-mentioned connecting terminal, the present invention further provides an electromechanical component, wherein the electromechanical component has the above-mentioned connecting terminal.

[0019] Among them, based on manufacturing and cost considerations, in one embodiment, the electromechanical component includes an outer shell, and the bracket is integrally formed on the outer shell.

[0020] To improve the insulation performance and creepage distance of the terminal block, in one embodiment, the outer shell includes a base, and the bracket is integrally formed on the base.

[0021] Preferably, the electromechanical component is a circuit breaker.

[0022] The present invention has the following beneficial effects: Different from the prior art, the present invention does not rigidly fix the nut frame and the copper busbar together, but supports the nut frame through a bracket, inserts the protruding column on the copper busbar into the insertion hole of the nut frame to realize the limiting relationship between the nut frame and the copper busbar, so that the nut frame has a certain swing margin relative to the copper busbar. When the wiring wire inserted into the nut frame is a soft multi-strand copper stranded wire, the swing of the nut frame itself offsets the propulsion force of the multi-strand copper stranded wire, thereby reducing the impact on the copper busbar. At the same time, the terminal block realizes a screw-free assembly method, further simplifies the production process and difficulty, and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of a circuit breaker in an embodiment;

[0024] Figure 2 is an exploded view of a circuit breaker in an embodiment;

[0025] Figure 3 is a schematic diagram of a base in an embodiment;

[0026] Figure 4 It is a three-dimensional schematic diagram of the inlet copper bar, the nut frame and the screw column assembled together in the embodiment;

[0027] Figure 5 Schematic diagram (cross-sectional view) of the assembly of the incoming copper bar, the nut frame and the screw column in the embodiment;

[0028] Figure 6 Schematic diagram of the contact and cooperation between the incoming copper bar and the moving contact in the embodiment;

[0029] Figure 7 2 is a three-dimensional schematic diagram of the incoming copper busbar in the embodiment;

[0030] Figure 8 yes Figure 7 A view from the middle;

[0031] Fig. 9 is a top view of the incoming copper busbar in the embodiment;

[0032] Fig.10 yes Figure 8 Sectional view at the middle BB;

[0033] Fig.11 is a three-dimensional schematic diagram of a nut frame in an embodiment;

[0034] Fig.12 1 is a three-dimensional schematic diagram of a screw column in the embodiment (angle 1);

[0035] Fig.13 1 is a three-dimensional schematic diagram of a screw column in the embodiment (angle 2);

[0036] Fig.14 It is a cross-sectional view of the screw column in the embodiment. DETAILED DESCRIPTION

[0037] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0038] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0039] See also Figure 1-2 As shown, as a preferred embodiment of the present invention, a circuit breaker is provided, comprising an outer shell 1 and a wiring terminal 2, wherein the outer shell 1 further comprises a base 12 and an upper cover 11, and the wiring terminal 2 further comprises an incoming copper bar 3 (as a wiring copper bar), a bracket 4, a nut frame 5 and a screw column 6, wherein the screw column 6 is screwed on the nut frame 5 and can be rotated to extend into the nut frame 5 to compress the wiring wire, and it is defined that one end of the screw column 6 screwed on the nut frame 5 is the upper end, and the other end facing away is the lower end, then the screw column 6 is screwed on the upper end of the nut frame 5, and the lower end of the nut frame 5 is supported on the bracket 4. Figure 3The bracket 4 is fixedly connected (by screwing, molding, bonding, etc.) to the base 12. The bracket 4 is generally in a stepped structure, including a first step surface 41 and a second step surface 42 forming a drop. The first step surface 41 and the second step surface 42 are used to support the incoming copper bar 3 and the nut frame 5 respectively. In other embodiments, the first step surface 41 may not be provided, so that the incoming copper bar 3 is only fixedly assembled inside the outer shell 1. However, in this preferred embodiment of the present invention, the first step surface 41 is provided to support the incoming copper bar 3, further strengthening the support for the incoming copper bar 3, and enhancing the stability of the structure. The bracket 4 is integrally formed and fixedly connected with the base 12, which is easier to manufacture. The bracket 4 is preferably formed on the base 12 so as to serve as an extended insulating protection baffle, which can prevent the disadvantage of insufficient insulation performance due to the position of the incoming copper bar 3 being too close to the bottom of the circuit breaker and close to the distribution box. The creepage distance is increased by the provision of the bracket 4.

[0040] See also Figure 4-5 , and refer to Figure 6-10 The incoming copper bar 3 is a part of the contact conductive system of the circuit breaker. The incoming copper bar 3 is roughly in an "L" shape. It has a static contact 34 to cooperate with the movement of the moving contact 7 to realize the on and off of the circuit breaker circuit. It also has a sheet-shaped wiring part 31 for electrically connecting with an external wiring conductor. Specifically, the wiring part 31 is inserted into the nut frame 5. The wiring conductor is pressed against the wiring part 31 by rotating the screw column 6 to realize the electrical connection between the wiring conductor and the incoming copper bar 3; the wiring part 31 is provided with a protruding The boss 33 is used to cooperate with the socket 54 on the nut frame 5, so as to roughly limit the nut frame 5; coinciding with the center of the boss 33, a through slot 32 is provided on the wiring portion 31 (so the boss 33 can also be regarded as the flange of the slot 32), and the slot 32 is directly opposite to the screw column 6. When the screw column 6 is rotated to compress the wiring wire, the wiring wire (especially the multi-strand copper stranded wire) can be pressed into the slot 32, so that the wiring wire is twisted firmly, the anti-pull-off force of the wiring wire is increased, and the reliability of the wiring is ensured. The slot 32 is a through hole coinciding with the center of the boss 33, which is not only for the consideration of saving materials, but also makes the processing process simpler and improves the processability. In other embodiments, the slot 32 can be set at other positions of the wiring portion 31, as long as it can be directly opposite to the screw column 6, and the slot 32 can also be a blind hole.

[0041] See also Figure 4-5 , and refer to Fig.11The nut frame 5 is roughly a rectangular body with a box-shaped hole, including a main body 51, a receiving groove 53 is opened on the main body 51, and the receiving groove 53 forms the internal space of the nut frame 5. The lower part of the receiving groove 53 is a square shape matching the wiring part 31, which is used to match the wiring part 31, and the upper part is semicircular, which is used to accommodate the wiring wire; the top of the main body 51 is tapped with an internal threaded hole 52 for screwing the screw column 6, and the bottom of the main body 51 is opened with a socket 54, and the shape of the socket 54 roughly matches the boss 33. When the wiring part 31 is inserted into the nut frame 5, the lower end of the main body 51 is located between the bracket 4 and the incoming copper bus 3, and the boss 33 is inserted and matched in the socket 54, thereby roughly limiting the nut frame 5. The nut frame 5 is limited in position in a manner that it has a swing margin relative to the incoming copper bar 3, so that when the wiring wire inserted into the nut frame 5 is a soft multi-strand copper stranded wire, the nut frame 5 can offset the propulsion force of the multi-strand copper stranded wire through its own swing to reduce the impact on the incoming copper bar 3. In this embodiment, the matching clearance between the protrusion 33 and the insertion hole 54 is preferably between 0.3mm-1mm to ensure that the nut frame 5 has sufficient swing margin and the nut frame 5 is also properly limited. In addition, in this embodiment, the thickness of the lower end of the main body 51 is equivalent to the spacing height between the second step surface 42 and the incoming copper bar 3, so that when the screw column 6 presses the wire on the incoming copper bar 3, the nut frame 5 is also pressed and clamped between the second step surface 42 and the incoming copper bar 3 in its height direction, so that the nut frame 5 will not shake in its height direction, so as not to affect the stability of the electrical connection between the wiring wire and the incoming copper bar 3.

[0042] See also Figure 4-5 , and refer to Figure 12-14 The screw column 6 is a rotating body structure, and its outer circumference is provided with an external thread. The screw column 6 is screwed into the internal thread hole 52. When the screw column 6 is rotated, the screw column 6 can extend into the receiving groove 53 and approach the wiring part 31 through the thread cooperation between the screw column 6 and the internal thread hole 52, so as to press the wiring wire on the wiring part 31. A hexagonal groove 61 is provided at one end of the screw column 6 facing the outside of the nut frame 5, so as to facilitate the use of a hexagonal wrench to rotate the screw column 6. The end 63 of the screw column 6 facing the wiring part 31 is gradually conical, so as to increase the pressing force of pressing the wiring wire. At the same time, an annular groove 62 is provided on the end surface of the end of the screw column 6 facing the wiring part 31. Similar to the slot 32, when the screw column 6 is rotated to press the wiring wire, the wiring wire (especially the multi-strand copper stranded wire) can be pressed into the annular groove 62, so that the wiring wire is twisted firmly, the anti-pull-off force of the wiring wire is increased, and the reliability of the wiring is ensured.

[0043] The present embodiment is different from the prior art in that the nut frame 5 and the incoming copper busbar 3 are not rigidly fixed together. Instead, the nut frame 5 is supported by the bracket 4, and the boss 33 is inserted into the insertion hole 54 to realize the limiting relationship between the nut frame 5 and the incoming copper busbar 3, so that the nut frame 5 has a certain swing margin relative to the incoming copper busbar 3. When the wiring wire inserted into the nut frame is a soft multi-strand copper stranded wire, the swing of the nut frame 5 itself offsets the propulsion force of the multi-strand copper stranded wire, thereby reducing the impact on the incoming copper busbar; but when the screw column 6 on the nut frame 5 is screwed downward to tighten the wire end (multi-strand copper stranded wire) of the wiring wire, the lower end of the screw column 6 and the lower end of the nut frame 5 can clamp the incoming copper busbar 3 together, so that the wiring wire, the nut frame 5 and the incoming copper busbar 3 can form an integrated rigid connection structure without shaking, which is consistent with the function of the existing terminal structure. Therefore, the terminal structure in this embodiment is not only suitable for wiring conductors with hard connecting parts as wire ends, but also suitable for wiring conductors with soft wire ends. In addition, compared with the prior art, the terminal structure in this embodiment omits the method of fixing and assembling by the fastening screws at the lower end of the nut frame, which further simplifies the production process and difficulty, reduces the production cost, and does not cause the uneven contact surface between the nut frame and the incoming copper busbar due to the crooked installation of the fastening screws, or the loosening of the fastening screws due to thermal expansion and contraction as described in the background. In addition, since the lower end of the nut frame of this embodiment is also supported by the bracket, the insulation performance of the terminal is further improved.

[0044] This embodiment is described by taking the incoming terminal in the wiring terminal of the circuit breaker as an example, but the wiring terminal structure provided in this embodiment can also be applied to the outgoing terminal of the circuit breaker or other electromechanical components; as long as the internal wiring copper bar (hard material) connected to the electromechanical component will affect the internal working environment due to the shaking of the nut frame during wiring, the above-mentioned improved wiring terminal structure of the present invention can be used to solve the problem, for example: the wiring terminal of the present invention can also be applied to: contactors, disconnectors and low-voltage electrical appliances.

[0045] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims will fall within the scope of protection of the present invention.

Claims

1. A terminal block, comprising a nut frame, a screw column and a copper busbar, wherein the screw column is screwed to the nut frame and can be rotated to extend into the nut frame, characterized in that: It is defined that one end of the screw column screwed on the nut frame is the upper end, and the other end facing away is the lower end. It also includes a bracket, and the lower end of the nut frame is supported on the bracket. The nut frame is provided with a socket, and the wiring copper bus is provided with a protrusion matching the shape of the socket. The wiring copper bus is inserted into the nut frame so that the lower end of the nut frame is located between the bracket and the wiring copper bus and the protrusion is inserted into the socket, thereby limiting the nut frame.

2. The terminal block according to claim 1, characterized in that: The nut frame is limited in a manner of having a swing margin.

3. The terminal block according to claim 2, characterized in that: The matching clearance between the boss and the socket is between 0.3 mm and 1 mm.

4. The terminal block according to claim 1, characterized in that: The thickness of the lower end of the nut frame is equivalent to the spacing height between the bracket and the wiring copper bar.

5. The connection terminal according to claim 1, characterized in that: The wiring copper bar is provided with a slotted hole at a position directly facing the screw column.

6. The connecting terminal according to claim 1 or 5, characterized in that: An annular groove is formed on the end surface of the screw column facing the wiring copper bar.

7. The connection terminal according to claim 5, characterized in that: The slot hole is a through hole, and the center of the slot hole coincides with the center of the protruding column.

8. The connection terminal according to claim 1, characterized in that: The screw column is in a tapered shape which gradually contracts toward one end of the wiring copper bar.

9. The connection terminal according to claim 1, characterized in that: The bracket has a stepped structure, including a first step surface and a second step surface forming a step. The wiring copper bar is supported on the first step surface, and the bottom of the nut frame is supported on the second step surface.

10. An electromechanical component, characterized in that: The electromechanical component has a connection terminal as described in any one of claims 1-9.

11. The electromechanical component according to claim 10, characterized in that: The electromechanical component comprises an outer shell, and the bracket is integrally formed on the outer shell.

12. The electromechanical component according to claim 10, characterized in that: The electromechanical component is a circuit breaker.

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