An electromagnetic system for a miniature circuit breaker

Abstract

This utility model belongs to the field of circuit breakers, specifically relating to an electromagnetic system for a miniature circuit breaker. It includes a magnetic yoke, coil frame, coil, stationary iron core, moving iron core, and push rod. A knob is rotatably mounted outside the housing. Inside the housing, a torsion spring is positioned between the moving iron core and the knob. The first torsion arm of the torsion spring abuts against the knob, and the second torsion arm abuts against the moving iron core. The knob drives the first torsion arm of the torsion spring to adjust the force applied to the moving iron core by the second torsion arm. This electromagnetic system adjusts the torque value of the torsion spring through an external knob, and the knob drives the first torsion arm of the torsion spring to adjust the force applied to the moving iron core by the second torsion arm, thereby achieving adjustment of instantaneous tripping values ​​for different specifications. This structure is simple in design and convenient to operate.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an electromagnetic system for a miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers, also known as micro circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz lines with rated voltages of 230 / 400V and rated currents up to 63A. They can also be used for infrequent switching of lines under normal conditions. Miniature circuit breakers are the most important and widely used type of circuit protection device in power distribution networks and building electrical terminal wiring. With the improvement of residents' living standards, their requirements for circuit breakers are getting higher and higher. Miniature circuit breakers generally consist of an operating mechanism, an electromagnetic system, a thermal trip system, and an arc-extinguishing system. The thermal trip system and the electromagnetic system are the components that provide overload and short-circuit protection for electrical switches. The electromagnetic system includes a yoke, coil frame, coil, stationary iron core, moving iron core, push rod, and iron core spring. Currently, the electromagnetic system of miniature circuit breakers on the market adjusts the instantaneous trip value of different specifications by adjusting the torque value of the iron core spring.

[0003] However, in existing electromagnetic systems, the core spring is installed between the moving and stationary cores within the coil frame. The core spring uses a built-in structure design, which makes adjusting the core spring torque value cumbersome and cannot meet the requirements for adjusting the instantaneous tripping value for different specifications. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an electromagnetic system for a miniature circuit breaker that can effectively solve the adjustment of instantaneous tripping values ​​for different specifications and is easy to operate.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An electromagnetic system for a miniature circuit breaker includes a magnetic yoke disposed within a housing, a coil frame disposed on the magnetic yoke, a coil disposed on the coil frame, a stationary iron core disposed within the coil frame, a movable iron core disposed within the coil frame, and a push rod disposed on the movable iron core. A knob is rotatably disposed outside the housing. A torsion spring is disposed inside the housing between the movable iron core and the knob. The first torsion arm of the torsion spring abuts against the knob, and the second torsion arm of the torsion spring abuts against the movable iron core. The knob drives the first torsion arm of the torsion spring to adjust the force applied by the second torsion arm to the movable iron core.

[0006] In some embodiments, a positioning shaft is provided inside the housing, one end of the knob has a positioning groove fitted on the positioning shaft, and the other end of the knob has an adjustment rotation groove exposed outside the housing.

[0007] In some embodiments, the torsion spring is mounted on the positioning shaft, and a limiting groove covering the torsion spring is provided in the positioning groove.

[0008] In some embodiments, the outer peripheral wall of the knob is provided with a slot that communicates with the limiting groove, and the first torsion arm of the torsion spring is engaged in the slot.

[0009] In some embodiments, one end of the moving iron core has a linkage portion extending outside the coil frame, and the linkage portion has a slot that engages with the second torsion arm.

[0010] In some embodiments, the other end of the moving iron core is connected to a push rod, one end of which passes through the stationary iron core and has a push boss extending outside the coil frame.

[0011] In some embodiments, the housing is provided with an adjustment hole through which a knob can pass, the outer peripheral wall of the knob has a ring of adjustment teeth, and the adjustment hole is provided with a positioning protrusion that engages with the adjustment teeth. In some embodiments, the housing is provided with a limiting member to restrict the rotation of the knob.

[0012] In some embodiments, one end of the limiting member has an arc-shaped groove, and the outer peripheral wall of the knob has an arc-shaped protrusion that fits into the arc-shaped groove.

[0013] In some embodiments, the housing is provided with a U-shaped limiting groove, the limiting groove is connected to the adjustment hole, the limiting member is engaged in the limiting groove, and a locking engagement is formed between the limiting member and the housing.

[0014] The beneficial effects of this utility model are as follows: The electromagnetic system adjusts the torque value of the torsion spring through an external knob. The knob drives the first torsion arm of the torsion spring to adjust the force applied by the second torsion arm to the moving iron core, thereby realizing the adjustment of the instantaneous tripping value of different specifications. The structure is simple in design and easy to operate. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a perspective view of a miniature circuit breaker according to an embodiment of the present invention; Figure 2 This is an exploded view of the miniature circuit breaker according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a miniature circuit breaker according to an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of section A in the middle; Figure 5 This is a perspective view of the knob in an embodiment of the present utility model; Figure 6 This is a perspective view of the limiting component in an embodiment of the present utility model. Detailed Implementation

[0017] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0019] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-3 As shown, an electromagnetic system for a miniature circuit breaker includes a magnetic yoke 2 disposed within a housing 1, a coil frame 3 disposed on the magnetic yoke 2, a coil 4 disposed on the coil frame 3, a stationary iron core 5 disposed within the coil frame 3, a movable iron core 6 disposed within the coil frame 3, and a push rod 7 disposed on the movable iron core 6 in conjunction with the coil iron core 6. A knob 8 is rotatably disposed outside the housing 1. A torsion spring 9 is disposed inside the housing 1 between the movable iron core 6 and the knob 8. The first torsion arm 91 of the torsion spring 9 abuts against the knob 9, and the second torsion arm 92 of the torsion spring 9 abuts against the movable iron core 6. The knob 8 drives the first torsion arm 91 of the torsion spring 9 to adjust the force applied by the second torsion arm 92 to the movable iron core 6.

[0021] like Figure 2-6As shown, a positioning shaft 11 is provided inside the housing 1. One end of the knob 8 has a positioning groove 81 fitted onto the positioning shaft 11, and the other end of the knob 8 has an adjustment rotation groove 82 protruding outside the housing 1. The knob is rotatably mounted on the positioning shaft inside the housing, which facilitates the assembly of the knob and the housing and ensures reliable rotation of the knob on the housing. The knob can be rotated by adjusting the rotation groove, making operation more convenient. A torsion spring 9 is fitted onto the positioning shaft 11, and a limiting groove 811 covering the torsion spring 9 is provided in the positioning groove 81. The torsion spring is fitted onto the positioning shaft, which facilitates the assembly of the torsion spring and the housing, and the limiting groove can prevent the torsion spring from disengaging from the positioning shaft. A slot 812 is provided on the outer peripheral wall of the knob 8, which communicates with the limiting groove 811. The first torsion arm 91 of the torsion spring 9 is engaged in the slot 812. The first torsion arm of the torsion spring is engaged in the slot of the knob, which ensures that the knob can reliably drive the torsion spring, which helps to improve the transmission reliability between the knob and the torsion spring. One end of the moving iron core 6 has a linkage part 61 extending outside the coil frame 3, and the linkage part 61 has a groove 611 that engages with the second torsion arm 92. The moving iron core engages with the second torsion arm of the torsion spring through the groove, thereby ensuring the reliability of the transmission between the moving iron core and the second torsion arm. The other end of the moving iron core 6 is connected to the push rod 7, one end of the push rod 7 passes through the stationary iron core 5 and has a push boss 71 extending outside the coil frame 3. The push rod is connected to the moving iron core, thereby ensuring more reliable transmission between the push rod and the moving iron core. The housing 1 is provided with an adjustment hole 12 through which the knob 8 can pass. The outer peripheral wall of the knob 8 has a ring of adjustment gear teeth 83, and the adjustment hole 12 is provided with a positioning protrusion 121 that engages with the adjustment gear teeth 83. The knob engages with the positioning protrusion in the adjustment hole through the adjustment gear teeth, thereby improving the feel of the knob when rotating, making the adjustment feel better and the operation more convenient. like Figure 2 , 4 As shown in Figure 6, a limiting member 13 is provided on the housing 1 to restrict the rotation of the knob 8. During adjustment, when the knob is rotated to the set position, the limiting member is pressed against the knob, thus restricting the knob to the set position and improving the convenience of operation. One end of the limiting member 13 has an arc-shaped groove 131, and the outer peripheral wall of the knob 8 has an arc-shaped protrusion 84 that fits against the arc-shaped groove 131. The limiting member fits against the arc-shaped protrusion of the knob through the arc-shaped groove, thereby ensuring that the limiting member can reliably restrict the rotation of the knob, which helps to improve the working reliability of the electromagnetic system. The housing 1 is provided with a U-shaped limiting slot 14, which is connected to the adjustment hole 12. The limiting member 13 is engaged in the limiting slot 14, forming a snap-fit ​​engagement between the limiting member 13 and the housing 1. The limiting member is engaged in the limiting slot of the housing, which facilitates the assembly of the limiting member and the housing, resulting in higher assembly efficiency.

[0022] The electromagnetic system adjusts the torque value of the torsion spring through an external knob. The knob drives the first torsion arm of the torsion spring to adjust the force applied by the second torsion arm to the moving iron core, thereby realizing the adjustment of the instantaneous tripping value of different specifications. The structure is simple in design and easy to operate.

[0023] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An electromagnetic system for a miniature circuit breaker, characterized in that: The device includes a magnetic yoke disposed within a housing, a coil frame disposed on the magnetic yoke, a coil disposed on the coil frame, a stationary iron core disposed within the coil frame, a movable iron core disposed within the coil frame, and a push rod disposed on the movable iron core. A knob is rotatably disposed outside the housing. A torsion spring is disposed inside the housing between the movable iron core and the knob. The first torsion arm of the torsion spring abuts against the knob, and the second torsion arm of the torsion spring abuts against the movable iron core. The knob drives the first torsion arm of the torsion spring to adjust the force applied by the second torsion arm to the movable iron core.

2. The electromagnetic system of the miniature circuit breaker according to claim 1, characterized in that: The housing is provided with a positioning shaft, one end of the knob has a positioning groove that is fitted onto the positioning shaft, and the other end of the knob has an adjustment rotation groove that protrudes from the housing.

3. The electromagnetic system of the miniature circuit breaker according to claim 2, characterized in that: The torsion spring is mounted on the positioning shaft, and a limiting groove covering the torsion spring is provided in the positioning groove.

4. The electromagnetic system of the miniature circuit breaker according to claim 3, characterized in that: The outer peripheral wall of the knob is provided with a slot that communicates with the limiting groove, and the first torsion arm of the torsion spring is engaged in the slot.

5. The electromagnetic system of the miniature circuit breaker according to claim 1, characterized in that: The moving iron core has a linkage part extending outside the coil frame at one end, and the linkage part has a slot that engages with the second torsion arm.

6. The electromagnetic system of the miniature circuit breaker according to claim 5, characterized in that: The other end of the moving iron core is connected to the push rod, and one end of the push rod passes through the stationary iron core and has a push boss extending outside the coil frame.

7. The electromagnetic system of the miniature circuit breaker according to claim 1, characterized in that: The housing is provided with an adjustment hole through which the knob can pass, the outer peripheral wall of the knob has a ring of adjustment teeth, and the adjustment hole is provided with a positioning protrusion that engages with the adjustment teeth.

8. The electromagnetic system of the miniature circuit breaker according to claim 7, characterized in that: The housing is provided with a limiting member to restrict the rotation of the knob.

9. The electromagnetic system of the miniature circuit breaker according to claim 8, characterized in that: The limiting member has an arc-shaped groove at one end, and the outer peripheral wall of the knob has an arc-shaped protrusion that fits into the arc-shaped groove.

10. The electromagnetic system of the miniature circuit breaker according to claim 8 or 9, characterized in that: The housing is provided with a U-shaped limiting groove, which is connected to the adjustment hole. The limiting member is engaged in the limiting groove, thus forming a snap-fit ​​engagement between the limiting member and the housing.

Images