Adjustable backup protection device of circuit breaker

Abstract

The utility model discloses an adjustable backup protection device for a circuit breaker, which comprises a magnet yoke, an armature, a U-shaped support and a torsion spring, the armature is rotatably arranged at the upper end of the U-shaped support through a pin shaft, the torsion spring is sleeved on the pin shaft, at least one adjusting part is arranged on the U-shaped support, and the adjusting part and the torsion spring are distributed in a vertically staggered manner. The adjusting part is provided with a plurality of gear grooves at intervals in the height direction of the U-shaped support, one end of the torsion spring abuts against the armature, and the other end of the torsion spring obliquely extends to be clamped in any gear groove in an abutting mode. According to the torsion spring, the purpose of changing the spring force value is achieved by selectively installing the torsion spring in the gear grooves at different height positions, the effect of changing the electromagnetic force of the action of attracting the armature is achieved by adjusting the spring force of the torsion spring, multi-gear accurate adjustment can be achieved, and the service life of the torsion spring is prolonged. The adjustable effect of the backup protection device on instantaneous short-circuit current protection is achieved, the installation universality is high, the production benefit is improved, and the product performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an adjustable backup protection device for a circuit breaker. Background Art

[0002] The electronic molded case circuit breaker uses the control signal generated by the intelligent controller to control the electronic release to disconnect the circuit breaker, thereby protecting the circuit. However, when a very large short-circuit current passes through the circuit, the electronic molded case circuit breaker needs to go through the process of main circuit current detection amplification and signal conversion before the electronic release can trigger the circuit breaker to operate, so it cannot disconnect the fault very quickly. The existing practice is to add an electromagnetic backup protection mechanism to the electronic molded case circuit breaker, and use the backup protection device to push the traction rod of the circuit breaker to achieve the purpose of tripping protection of the circuit breaker and quickly disconnect the instantaneous short-circuit current.

[0003] The backup protection release of the existing molded case circuit breaker mainly includes an armature, a bracket, a yoke, a pin and a reaction spring, wherein the yoke is fixed to the base of the circuit breaker, the armature is hinged to the upper end of the bracket through the pin, the yoke is fixedly connected to the lower end of the bracket, the reaction spring is sleeved on the pin, and the two ends of the reaction spring are respectively connected to the armature and the bracket. When the instantaneous current in the line exceeds several times the normal current, the electromagnetic force generated by the yoke is greater than the force of the reaction spring, and the armature is attracted and rotated by the yoke, thereby pushing the traction rod to rotate to realize the tripping of the circuit breaker. With the rapid development of intelligence and multi-function of molded case circuit breakers, the backup protection release of the circuit breaker is required to achieve diversified protection functions according to different loads, but the instantaneous short-circuit current of the existing backup protection release is rated, which cannot be well applied to the instantaneous short-circuit current protection requirements of different loads. It is usually necessary to replace the backup protection release of different specifications, which cannot meet the actual needs and market requirements, and the installation versatility is poor, which will increase the use cost. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the instantaneous short-circuit current at which the backup protection release is triggered is rated, which cannot be applied to the instantaneous short-circuit current protection requirements of different loads, and usually requires replacement of backup protection releases of different specifications, resulting in poor installation versatility and increased use costs.

[0005] In order to solve the above technical problems, the utility model provides an adjustable backup protection device for a circuit breaker, comprising a yoke, an armature, a U-shaped bracket and a torsion spring, wherein the lower end of the U-shaped bracket is fixedly connected to the yoke, the armature is rotatably arranged on the upper end of the U-shaped bracket through a pin shaft, the torsion spring is sleeved on the pin shaft, the armature is provided with a trip rod for triggering the action of the traction rod, the U-shaped bracket is provided with at least one adjustment portion staggered with the torsion spring up and down, the adjustment portion is provided with a plurality of gear slots at intervals along the height direction of the U-shaped bracket, one end of the torsion spring abuts against the armature, and the other end thereof extends obliquely and is clamped in any of the gear slots.

[0006] As a preferred solution, the torsion spring is a double torsion spring structure sleeved on the pin shaft for driving the armature to achieve reset rotation.

[0007] As a preferred solution, the double torsion spring structure includes two elastic legs extending downwardly at an angle, and two adjustment parts are relatively arranged on the two side baffles of the U-shaped bracket, and the two elastic legs are respectively inserted and clamped in the gear slots of the two adjustment parts.

[0008] As a preferred solution, the double torsion spring structure includes two coaxially arranged spring parts and a middle protruding end connected between the two spring parts, two elastic legs are respectively connected to the two spring parts, and the middle protruding end abuts against the bottom of the armature.

[0009] As a preferred solution, the two adjustment parts are plate-shaped structures and are respectively connected to the baffles on both sides of the U-shaped bracket to form an L-shaped structure.

[0010] As a preferred solution, the adjustment portion is integrally formed on one side or both side baffles of the U-shaped bracket.

[0011] As a preferred solution, the two adjustment parts are fixed to one side or both side baffles of the U-shaped bracket by means of a screw structure, a welding structure or a riveting structure.

[0012] As a preferred solution, the adjustment portion includes a plurality of toothed blocks formed between a plurality of gear slots, and the openings of the plurality of gear slots are inclined toward one side of the upper end of the U-shaped bracket.

[0013] As a preferred solution, two limit plates that form a limit fit with the armature are further provided on the baffle plates on both sides of the U-shaped bracket, and the two adjustment parts are located below the two limit plates.

[0014] As a preferred solution, the yoke is U-shaped and surrounds the outside of the U-shaped bracket, and the yoke is fixedly connected to the conductive plate of the circuit breaker body.

[0015] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0016] 1. In the adjustable backup protection device for circuit breaker provided by the utility model, an adjustment part which is staggered with the torsion spring is provided on the U-shaped bracket, and a plurality of gear slots are provided on the adjustment part, and one end of the torsion spring is abutted against the armature, so that the other end thereof extends and is clamped in one of the gear slots, and the plurality of gear slots are arranged at intervals along the height direction of the U-shaped bracket. The torsion spring is selectively installed in the gear slots at different height positions, so as to achieve the purpose of changing the spring force value, and the electromagnetic suction force which attracts the armature action is generated when the instantaneous short-circuit current passes through the magnetic yoke, so after changing the spring force value, the instantaneous short-circuit current of different sizes needs to be passed to accurately trigger the armature action, and this design is to adjust the spring force of the torsion spring to play the role of changing the electromagnetic force which attracts the armature action, so that multiple gears can be precisely adjusted, and the backup protection device is realized. The effect of adjustable protection for instantaneous short-circuit current is achieved, and it can be better applied to the instantaneous short-circuit current protection requirements of different loads, and the installation versatility is strong, the production efficiency is improved, the product performance is improved, and the market requirements are met.

[0017] 2. In the adjustable backup protection device for circuit breaker provided by the utility model, according to the torsion spring, a double torsion spring structure is preferably used, and two adjustment parts are relatively arranged on the baffles on both sides of the U-shaped bracket, and the two elastic legs of the double torsion spring structure are inserted and clamped in the gear slots of the two adjustment parts. The higher the gear slot position selected according to the elastic legs, the greater the electromagnetic suction force required for the backup protection device to attract the armature to release the action, so as to achieve the purpose of adjustable instantaneous short-circuit current protection. This double torsion spring structure provides a greater elastic force and obtains better elastic energy release under energy storage. Therefore, after the electromagnetic suction force disappears, the double torsion spring structure restores the original shape of the armature by releasing the stored elastic potential energy, which is beneficial to improving the sensitivity and reliability of the armature resetting action. This double torsion spring structure can also play an elastic supporting role for the armature, making the armature more stable during rotation, thereby improving the product performance and service life.

[0018] 3. In the adjustable backup protection device for circuit breaker provided by the utility model, the opening of the gear slot is arranged to be inclined toward the upper end of the U-shaped bracket. The advantage of such a design is that after the elastic support foot of the double torsion spring structure is clamped in the gear slot of the adjustment part, since the gear slot is designed to have a certain inclination angle, the elastic support foot can be prevented from slipping out of the gear slot, and the installation stability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below.

[0020] Figure 1It is a structural schematic diagram of the adjustable backup protection device for circuit breaker of the utility model;

[0021] Figure 2 It is a schematic diagram of another structure of the adjustable backup protection device for circuit breaker of the utility model, especially showing a double torsion spring structure;

[0022] Figure 3 for Figure 2 The three-dimensional structural diagram of the adjustable backup protection device of the circuit breaker is shown;

[0023] Figure 4 This is a schematic diagram of the structure of the U-shaped bracket of the utility model;

[0024] Explanation of the reference numerals in the accompanying drawings: 1. yoke; 2. armature; 3. U-shaped bracket; 31. limit plate; 4. torsion spring; 41. elastic support foot; 42. middle raised end; 5. pin shaft; 6. adjustment part; 61. toothed block; 7. gear slot; 8. release rod. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example

[0029] The present embodiment is described in detail below with reference to the accompanying drawings:

[0030] This embodiment provides Figure 1-4The adjustable backup protection device for a circuit breaker shown in the figure comprises a yoke 1, an armature 2, a U-shaped bracket 3 and a torsion spring 4, wherein the lower end of the U-shaped bracket 3 is fixedly connected to the yoke 1, the armature 2 is rotatably arranged on the upper end of the U-shaped bracket 3 through a pin shaft 5, the torsion spring 4 is sleeved on the pin shaft 5, the armature 2 is provided with a tripping rod 8 for triggering the action of the traction rod, the yoke 1 can generate an electromagnetic attraction force for attracting the armature 2 to rotate when a short-circuit current passes through, so that the yoke 1 attracts the armature 2 to drive the tripping rod 8 to rotate and collide with the traction rod, the U-shaped bracket 3 is provided with at least one adjustment portion 6 which is staggered with the torsion spring 4 up and down, the adjustment portion 6 is provided with a plurality of gear slots 7 at intervals along the height direction of the U-shaped bracket, one end of the torsion spring 4 abuts against the armature 2, and the other end thereof extends obliquely and is clamped in any of the gear slots 7.

[0031] The above implementation mode is the core technical solution of this embodiment. An adjustment part 6 is provided on the U-shaped bracket 3, which is staggered with the torsion spring 4 up and down. A plurality of gear slots 7 are provided on the adjustment part 6. One end of the torsion spring 4 is abutted against the armature 2, so that the other end thereof extends and is clamped in one of the gear slots 7. According to the plurality of gear slots 7, which are arranged at intervals along the height direction of the U-shaped bracket, this torsion spring is selectively installed in the gear slots 7 at different height positions, so as to achieve the purpose of changing the spring force value. According to the electromagnetic attraction force that attracts the armature 2 when the instantaneous short-circuit current passes through the yoke 1, after changing the spring force value, it is necessary to pass instantaneous short-circuit currents of different sizes to accurately trigger the armature 2 to move. This design is to adjust the spring force of the torsion spring 4 to change the electromagnetic force that attracts the armature 2, so that multiple gears can be precisely adjusted, and the backup protection device is realized. The adjustable effect of instantaneous short-circuit current protection can be better applied to the instantaneous short-circuit current protection requirements of different loads. The installation versatility is poor, the use cost is reduced, the product performance is improved, and the market requirements are met.

[0032] In this embodiment, as a preferred implementation, refer to Figure 2-3The torsion spring 4 is preferably a double torsion spring structure sleeved on the pin shaft 5 to drive the armature 2 to realize reset rotation. Specifically, the double torsion spring structure includes two elastic legs 41 extending downwardly and obliquely, two coaxially arranged spring parts and an intermediate protruding end 42 connected between the two spring parts, the two elastic legs 41 are respectively connected to the two spring parts, the intermediate protruding end 42 abuts against the bottom of the armature 2, and two adjustment parts 6 are relatively arranged on the two side baffles of the U-shaped bracket 3. The two elastic legs 41 are respectively inserted and abutted in the gear slots 7 of the two adjustment parts 6. With this structural arrangement, the higher the position of the gear slot 7 selected according to the elastic legs 41, the greater the electromagnetic suction force required for the backup protection device to attract the armature to release, thereby achieving the purpose of adjustable instantaneous short-circuit current protection. This double torsion spring structure provides a greater elastic force and obtains better elastic energy release under energy storage. Therefore, after the electromagnetic attraction disappears, the double torsion spring structure restores the original shape of the armature 2 by releasing the stored elastic potential energy, which is beneficial to improve the sensitivity and reliability of the armature 2 reset action. This double torsion spring structure can also play an elastic support role for the armature 2, making the armature 2 more stable during the rotation process, improving the product performance and service life. Of course, the torsion spring 4 in this embodiment can also be selected as a single torsion spring structure, refer to Figure 1 The two ends of the single torsion spring structure are respectively abutted against the armature 2 and the gear slot 7 of the adjustment part.

[0033] Combination Figure 2-4 As shown, the two adjustment parts 6 are plate-like structures, and are respectively connected to the two side baffles of the U-shaped bracket 3 to form an L-shaped structure. This adjustment part 6 is integrally formed on one side or two side baffles of the U-shaped bracket 3. The integral structure is stable, easy to form and manufacture, and easy to install. Of course, there can be other different settings between the adjustment part 6 and the U-shaped bracket 3. For example, the two adjustment parts 6 are fixed to one side or two side baffles of the U-shaped bracket 3 by a screw structure, a welding structure, or a riveting structure, which can also achieve the installation and fixation between the adjustment part and the U-shaped bracket. Those skilled in the art can make a choice of the specific setting method of the adjustment part based on the above description, and will not be repeated here.

[0034] The adjusting portion 6 includes a plurality of tooth blocks 61 formed between a plurality of gear slots 7. Figure 4 As shown, the openings of the multiple gear slots 7 are inclined toward one side of the upper end of the U-shaped bracket 3, and three gear slots 7 are preferably provided on each adjustment part 6. With this structural arrangement, after the elastic support foot 41 of the double torsion spring structure is clamped in the gear slot 7 of the adjustment part 6, since the gear slot 7 is designed to have a certain inclination angle, the elastic support foot can be prevented from slipping out of the gear slot, and the installation stability is better.

[0035] Combination Figure 2 and Figure 4 As shown, two limit plates 31 are also provided on the baffle plates on both sides of the U-shaped bracket to form a limit fit with the armature 2, and two adjustment parts 6 are located below the two limit plates 31. The two limit plates 31 can limit the reset rotation stroke of the armature 2 under the action of the torsion spring 4. Among them, the yoke 1 is in a U shape and surrounds the outside of the U-shaped bracket 3. The yoke 1 and the U-shaped bracket 3 are fixedly connected by a riveting structure. The yoke is fixedly connected to the conductive plate of the circuit breaker body by a screw structure, thereby protecting the main circuit of the circuit breaker. When a very large short-circuit current passes through the line, the rear protection device in the molded case circuit breaker can quickly break the fault and achieve tripping.

[0036] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An adjustable backup protection device for a circuit breaker, comprising a yoke (1), an armature (2), a U-shaped bracket (3) and a torsion spring (4), wherein the lower end of the U-shaped bracket (3) is fixedly connected to the yoke (1), the armature (2) is rotatably arranged on the upper end of the U-shaped bracket (3) through a pin shaft (5), the torsion spring (4) is sleeved on the pin shaft (5), and a tripping rod (8) for triggering the action of a traction rod is provided on the armature (2), characterized in that: The U-shaped bracket (3) is provided with at least one adjusting portion (6) staggered with the torsion spring (4) in the upper and lower directions; the adjusting portion (6) is provided with a plurality of gear slots (7) at intervals along the height direction of the U-shaped bracket; one end of the torsion spring (4) abuts against the armature (2), and the other end thereof extends obliquely and abuts against any of the gear slots (7); the two adjusting portions (6) are plate-shaped structures, and are respectively connected to the baffle plates on both sides of the U-shaped bracket (3) to form an L-shaped structure; the adjusting portion (6) comprises a plurality of toothed blocks (61) formed between the plurality of gear slots (7); the openings of the plurality of gear slots (7) are arranged obliquely toward one side of the upper end of the U-shaped bracket (3); Two limit plates (31) are also provided on the baffle plates on both sides of the U-shaped bracket, and are matched with the armature (2) to form a limit position. The two adjustment parts (6) are located below the two limit plates (31).

2. The adjustable backup protection device for circuit breaker according to claim 1, characterized in that: The torsion spring (4) is a double torsion spring structure sleeved on the pin shaft (5) and used to drive the armature (2) to achieve reset rotation.

3. The adjustable backup protection device for circuit breaker according to claim 2, characterized in that: The double torsion spring structure comprises two elastic legs (41) extending downwardly and obliquely, two adjustment parts (6) are arranged oppositely on the two side baffles of the U-shaped bracket (3), and the two elastic legs (41) are respectively inserted and clamped in the gear slots (7) of the two adjustment parts (6).

4. The adjustable backup protection device for circuit breaker according to claim 3 is characterized in that: The double torsion spring structure comprises two coaxially arranged spring parts and a middle protruding end (42) connected between the two spring parts, two elastic legs (41) are respectively connected to the two spring parts, and the middle protruding end (42) abuts against the bottom of the armature (2).

5. The adjustable backup protection device for circuit breaker according to claim 1, characterized in that: The adjusting portion (6) is integrally formed on one side or both side baffles of the U-shaped bracket (3).

6. The adjustable backup protection device for circuit breaker according to claim 1, characterized in that: The two adjusting parts (6) are fixed to one side or both side baffles of the U-shaped bracket (3) by means of a screw structure, a welding structure or a riveting structure.

7. The adjustable backup protection device for circuit breaker according to claim 1, characterized in that: The magnetic yoke (1) is in a U shape and surrounds the outside of the U-shaped bracket (3); the magnetic yoke (1) is fixedly connected to the conductive plate of the circuit breaker body.

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