Circuit breaker with thermomagnetic conductive structure

Abstract

The utility model relates to a circuit breaker with a thermomagnetic conductive structure, which comprises a moving contact, a soft coupling and a thermomagnetic release which are sequentially arranged from front to back, the rear end of the moving contact is electrically connected with the soft coupling, the thermomagnetic release comprises a plate-shaped thermal element, and the thermal element is provided with a connecting end and is electrically connected with the soft coupling through the connecting end; wherein the connecting end is positioned below the rear side of the moving contact and extends downwards; the length of the soft connector is matched with the distance between the rear end of the moving contact and the connecting end, so that during closing, the rear end of the moving contact upwarps, and the soft connector is slightly bent backwards; and in an opening state, the rear end of the moving contact falls down, and the soft coupling is bent backwards. Compared with the prior art, according to the utility model, the position and orientation of the connecting end of the connecting part of the thermal element and the soft coupling in the thermomagnetic release are relative to the position and orientation of the moving contact, so that the movement is smoother, and the effects of reducing the length of the soft coupling, improving the space utilization rate and saving the cost are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a circuit breaker with a thermal magnetic conductive structure. Background Art

[0002] Existing circuit breakers are pursuing miniaturization, resulting in a shrinking internal space. The flexible coupling undergoes various motion states during closing, opening, and disconnecting, requiring more space for movement. In most existing products, after the flexible coupling is welded and installed, its natural extension direction is nearly perpendicular to the direction of movement, making movement less smooth. Furthermore, the flexible coupling is long, requiring more space and resulting in lower space utilization. During the screw-driving process in mass production, the flexible coupling can become entangled with the screws, affecting the circuit breaker's normal opening and closing, or causing the flexible coupling's wires to break, impacting product performance. Utility Model Content

[0003] The purpose of the utility model is to provide a circuit breaker with a thermomagnetic conductive structure, which makes the movement of the soft connection smoother, improves space utilization, reduces the length of the soft connection, and completely solves the problem that the soft connection may be twisted together with the screw.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A circuit breaker with a thermomagnetic conductive structure includes a movable contact, a flexible connection, and a thermomagnetic release arranged in sequence from front to back. The rear end of the movable contact is electrically connected to the flexible connection. The thermomagnetic release includes a plate-shaped thermal element having a connecting end and electrically connected to the flexible connection via the connecting end.

[0006] The connecting end is located below the rear side of the moving contact and extends downward;

[0007] The length of the soft connection is adapted to the distance between the rear end of the moving contact and the connection end, so that when the switch is closed, the rear end of the moving contact rises upward and the soft connection bends slightly backward; when the switch is open, the rear end of the moving contact falls and the soft connection bends backward.

[0008] Furthermore, the thermal element is in the shape of a bent plate from bottom to top and from front to back.

[0009] Furthermore, the thermal element is provided with a bent plate bent downward, and the connecting end is provided on the front side of the bent plate.

[0010] Furthermore, one end of the flexible connection is welded to the connecting end.

[0011] Furthermore, the utility model also includes a base, the base is provided with a boss with a through hole, the thermal element is also provided with a threaded hole, and the thermal element and the base are connected by a screw passing through the through hole and threadedly connected to the threaded hole.

[0012] Furthermore, a partition is provided on the thermal element, and the connecting end and the threaded hole are respectively located at the front and rear of the partition.

[0013] Furthermore, a recess for the heating element to pass through is provided on the lower side of the partition.

[0014] Furthermore, the partition is provided with protruding ends on both sides of the recess, and grooves are provided on both sides of the boss, and the protruding ends are embedded in the grooves.

[0015] Furthermore, in the open state, the soft connection bends backward and abuts against the partition.

[0016] Furthermore, the thermal-magnetic release also includes an armature, and the armature is arranged behind the partition.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The utility model adjusts the position and orientation of the connection end of the thermal element and the soft connection connection relative to the moving contact in the thermal magnetic release to make the movement smoother, thereby reducing the soft connection length, improving space utilization and saving costs.

[0019] 2) The utility model arranges the connection end for connecting to the soft connection vertically downward, which increases the distance from the moving contact, leaving more space for the squeezed part of the soft connection, and improves space utilization. In circuit breakers with large opening distances, the application of this structure is conducive to reducing the size of the circuit breaker.

[0020] 3) The utility model provides a partition on the thermal element to separate the soft connection and the base screw, thereby solving the problem that the soft connection may be twisted together with the screw, and improving product quality and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a circuit breaker with a thermal magnetic release in the open state in an embodiment;

[0022] Figure 2 Schematic diagram of the structure of a circuit breaker with a thermal magnetic release in a closed state in an embodiment;

[0023] Figure 3 This is a schematic diagram of the welding of the flexible connection and the bent plate of the thermal element;

[0024] Figure 4 Schematic diagram of the three-dimensional structure of a circuit breaker with a thermal magnetic release in an embodiment;

[0025] Figure 5 It is a structural diagram of the thermal element;

[0026] Figure 6 is a structural diagram of the partition;

[0027] Figure 7 This is a schematic diagram of an open state of a circuit breaker with a thermal magnetic release in the prior art;

[0028] Figure 8 The figure is a schematic diagram of the closing state of a circuit breaker with a thermal magnetic release in the prior art.

[0029] Description of the marks in the figure:

[0030] 1. Base, 101. Boss, 102. Groove; 2. Moving contact; 3. Flexible connection; 4. Thermal magnetic release, 41. Thermal element, 4101. Bend plate, 4102. Threaded hole; 42. Armature; 5. Screw; 6. Partition, 601. Notch. DETAILED DESCRIPTION

[0031] The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0033] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0034] Example:

[0035] like Figure 1 A circuit breaker with a thermal-magnetic release is shown, comprising a moving contact 2, a soft link 3, and a thermal-magnetic release 4, arranged in sequence from front to back. The rear end of the moving contact 2 is electrically connected to the soft link 3. The thermal-magnetic release 4 includes a plate-shaped thermal element 41, which has a connecting end and is electrically connected to the soft link 3 via the connecting end. The connecting end is located below the rear side of the moving contact 2 and extends downward. The length of the soft link 3 is adapted to the spacing between the rear end of the moving contact 2 and the connecting end, so that when the circuit is closed, the rear end of the moving contact 2 is tilted upward and the soft link 3 is slightly bent backward. When the circuit is opened, the rear end of the moving contact 2 falls and the soft link 3 is bent backward.

[0036] In some specific embodiments, such as Figure 5 As shown, the thermal element 41 is in the shape of a bent plate from bottom to top and from front to back.

[0037] In some specific embodiments, a downwardly bent plate 4101 is provided on the thermal element 41 , and the connection end is provided on the front side of the bent plate 4101 .

[0038] In some specific embodiments, one end of the flexible connection 3 is welded to the connection end.

[0039] In some specific embodiments, a base 1 is further included, a boss 101 with a through hole is provided on the base 1, a threaded hole 4102 is also provided on the thermal element 41, and the thermal element 41 is connected to the base 1 via a screw 5 that passes through the through hole and is threadedly connected to the threaded hole 4102.

[0040] In some specific embodiments, such as Figure 2 and Figure 6 As shown, a partition 6 is provided on the thermal element 41 , and the connection end and the threaded hole 4102 are respectively located at the front and rear of the partition 6 .

[0041] In some specific embodiments, a recess 601 is formed on the lower side of the partition 6 for the heating element 41 to pass through.

[0042] In some specific embodiments, protruding ends are provided on both sides of the recess 601 on the partition 6 , and grooves 102 are provided on both sides of the boss 101 , and the protruding ends are embedded in the grooves 102 .

[0043] In some specific embodiments, in the open state, the flexible connection 3 bends backward and abuts against the partition 6.

[0044] In some specific embodiments, the thermal-magnetic release 4 further includes an armature 42 , which is disposed behind the partition 6 .

[0045] This embodiment is implemented in the following ways: Figure 3 As shown, one end of the soft link 3 is welded to the moving contact 2, and the other end is welded to the bent plate 4101 in the vertical direction of the thermal element 41. The cross-sectional area of the soft link 3 varies depending on the rated current. When the rated current is large, the soft link 3 can be divided into two strands and welded on both sides of the moving contact 2. When the rated current is small, two small soft links can be welded on both sides, or only on one side. The thermal magnetic release 4 includes parts such as the thermal element 41 and the armature 42. The notch 601 of the partition 6 is stuck on the thermal element 41 to separate the soft link 3 from the threaded hole 4102 of the thermal element. Figure 4 As shown, the partition 6 is placed into the base 1 together with the thermal-magnetic release 4 , and both sides of the partition 6 are inserted into the corresponding grooves 102 on the base 1 , and the thermal element 41 is fixed on the boss 101 by screws 5 .

[0046] Working principle:

[0047] In the design of the prior art, Figure 7 and Figure 8 As shown in the figure, the thermal element in the circuit breaker is located below and behind the moving contact, and the welding head of the soft connection is in the horizontal direction, which makes the soft connection bend and squeeze more seriously under different conditions, and the soft connection length needs to be longer. Figure 3 As shown, in this solution, the thermal element 41 is designed with a vertical bent plate 4101, and the flexible connection 3 is welded to the bent plate 4101 of the thermal element from the horizontal direction. From the perspective of processing and manufacturing, it is still simple and convenient. Figure 1 、 Figure 2 As shown, from the opening to the closing process, the soft connection 3 at one end of the thermal element 41 naturally stretches vertically upward, consistent with the direction of movement, and is always in the expansion process during the closing process. The soft connection 3 has no unnecessary bending length loss and bending tension hindrance; therefore, compared with the prior art, the length of the soft connection 3 can be appropriately reduced, and at the same time, the squeezing of the soft connection 3 in the re-fastening state will inevitably be improved.

[0048] When the circuit breaker is opened, the moving contact 2 rotates clockwise, and the flexible link 3 moves backward accordingly. At one end of the thermal element 41, the flexible link 3 swings backward along the curved corner of the bent plate 4101, and is finally compressed as shown in FIG. Figure 1 In the illustrated area, bent plate 4101 and the weld joint are arranged vertically and downward, increasing the distance from the moving contact 2 and leaving more space for the squeezed portion of the flexible connection 3, thereby improving space utilization. Therefore, there is room horizontally for a partition between the flexible connection 3 and the threaded hole 4102. Currently, there is a pressing need to increase the rated voltage level of products, and increasing the opening distance is a key measure. Increasing the angular travel of the moving contact during opening and closing is one of the primary technical solutions. In this context, the present thermal-magnetic connection structure is beneficial for reducing the size of the circuit breaker.

[0049] like Figure 4 As shown, the notch 601 of the partition 6 is engaged with the thermal element 41, separating the flexible coupling 3 from the thermal element threaded hole 4102. The partition 6 is placed into the base 1 along with the thermal-magnetic trip unit 4, with both sides of the partition 6 inserted into the slots 102 on the base 1. The thermal element 41 is then secured to the boss 101 with screws 5. During assembly, the mechanism is in a free state, while the flexible coupling 3 is in a squeezed state. Due to the presence of the partition 6, the flexible coupling 3 does not contact the threaded hole 4102. Therefore, during screw driving and circuit breaker opening and closing, the wires of the flexible coupling 3 will never become entangled with the screws 5, and there is no risk of the wires being torn, thereby improving product quality and reliability.

[0050] This embodiment changes the connection position and direction of the soft connection 3 to make the movement process of the soft connection 3 smoother and the path of the soft connection 3 shorter when closing the switch, thereby achieving the purpose of reducing the length of the soft connection 3 and improving space utilization. At the same time, it solves the problem of the soft connection 3 being entangled with the screw 5 due to compression when it is buckled again or in the free state.

[0051] In other embodiments, the bending angle of the bent plate 4101 in the thermal element 41 may not be 90°, as long as the angle between the bent plate 4101 and the vertical direction is small.

[0052] In other embodiments, in addition to being used in molded case circuit breakers, this structure can also be used in products such as disconnectors that adopt a molded case structure.

[0053] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A circuit breaker with a thermomagnetic conductive structure, characterized in that: The invention comprises a moving contact (2), a soft connection (3), and a thermal magnetic release (4) arranged in sequence from front to back, wherein the rear end of the moving contact (2) is electrically connected to the soft connection (3), and the thermal magnetic release (4) comprises a plate-shaped thermal element (41), wherein the thermal element (41) has a connection end and is electrically connected to the soft connection (3) via the connection end; The connecting end is located below the rear side of the moving contact (2) and extends downward; The length of the soft connection (3) is adapted to the distance between the rear end of the moving contact (2) and the connection end, so that when the switch is closed, the rear end of the moving contact (2) rises upward and the soft connection (3) bends slightly backward; when the switch is open, the rear end of the moving contact (2) falls and the soft connection (3) bends backward.

2. The circuit breaker with a thermomagnetic conductive structure according to claim 1, characterized in that: The thermal element (41) is in the shape of a plate bent from bottom to top and from front to back.

3. The circuit breaker with a thermomagnetic conductive structure according to claim 1, characterized in that: The thermal element (41) is provided with a bent plate (4101) bent downward, and the connection end is provided on the front side of the bent plate (4101).

4. The circuit breaker with a thermomagnetic conductive structure according to claim 1, characterized in that: One end of the soft connection (3) is welded to the connection end.

5. The circuit breaker with a thermomagnetic conductive structure according to claim 1, characterized in that: The heat element (41) further comprises a base (1), wherein the base (1) is provided with a boss (101) having a through hole, and the heat element (41) is further provided with a threaded hole (4102), and the heat element (41) and the base (1) are connected via a screw (5) passing through the through hole and being threadedly connected to the threaded hole (4102).

6. The circuit breaker with a thermomagnetic conductive structure according to claim 5, characterized in that: A partition (6) is provided on the thermal element (41), and the connecting end and the threaded hole (4102) are respectively located at the front and rear of the partition (6).

7. The circuit breaker with a thermomagnetic conductive structure according to claim 6, characterized in that: A recess (601) for the heating element (41) to pass through is provided on the lower side of the partition (6).

8. The circuit breaker with a thermomagnetic conductive structure according to claim 7, characterized in that: The partition (6) is provided with protruding ends on both sides of the notch (601), and grooves (102) are also provided on both sides of the boss (101), and the protruding ends are embedded in the grooves (102).

9. The circuit breaker with a thermomagnetic conductive structure according to claim 6, characterized in that: In the open state, the soft connection (3) bends backward and abuts against the partition (6).

10. The circuit breaker with a thermomagnetic conductive structure according to claim 6, characterized in that: The thermal magnetic release (4) also includes an armature (42), and the armature (42) is arranged behind the partition (6).

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