CN221327629U - Tripping protection system for improving rated current of molded case circuit breaker - Google Patents
Tripping protection system for improving rated current of molded case circuit breaker Download PDFInfo
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- CN221327629U CN221327629U CN202323141148.0U CN202323141148U CN221327629U CN 221327629 U CN221327629 U CN 221327629U CN 202323141148 U CN202323141148 U CN 202323141148U CN 221327629 U CN221327629 U CN 221327629U
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- armature
- circuit breaker
- rated current
- molded case
- protection system
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- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The utility model relates to a tripping protection system for improving rated current of a molded case circuit breaker. The utility model comprises an overcurrent tripping system, a tripping device and a tripping device, wherein the overcurrent tripping system comprises a moving contact system, a contact terminal, a thermal element and a bimetallic strip, wherein the thermal element and the bimetallic strip are respectively connected between the moving contact system and the contact terminal; the instantaneous tripping system comprises a magnetic yoke connected to the contact terminal, an armature bracket, an armature rotatably connected to the armature bracket and matched with the magnetic yoke, and an instantaneous spring connected between the armature bracket and the armature, wherein the armature is positioned beside the traction rod, and the instantaneous spring provides an elastic force for enabling the acting end of the armature to rotate away from the direction of the traction rod. The utility model can improve the tripping reliability and breaking performance of the thermomagnetic tripping protection system under the original shape of the shell frame of the small-shell-frame plastic-shell circuit breaker.
Description
Technical Field
The utility model relates to the technical field of circuit breakers, in particular to a tripping protection system for improving rated current of a molded case circuit breaker.
Background
The existing tripping protection system of the small-shell molded case circuit breaker mostly adopts a heating mode of a thermal element. However, in order to reduce the cost and increase the maximum rated current that can be accommodated by the original housing, it is generally necessary to use high-resistance thermal elements, which results in the drawbacks of high cost and high power consumption.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art, so that the tripping reliability and breaking performance of the thermomagnetic tripping protection system can be improved under the condition of the original outline of the shell of the small-shell-frame plastic-shell circuit breaker.
In order to solve the technical problems, the utility model provides a trip protection system for improving rated current of a molded case circuit breaker, comprising:
The overcurrent tripping system comprises a moving contact system, a contact terminal, a thermal element and a bimetallic strip, wherein the thermal element and the bimetallic strip are respectively connected between the moving contact system and the contact terminal, and a delay adjusting screw positioned beside a traction rod of the circuit breaker is connected to the bimetallic strip;
The instantaneous tripping system comprises a magnetic yoke connected to the contact terminal, an armature bracket, an armature rotatably connected to the armature bracket and matched with the magnetic yoke, and an instantaneous spring connected between the armature bracket and the armature, wherein the armature is positioned beside the traction rod, and the instantaneous spring provides elastic force for enabling the acting end of the armature to rotate away from the traction rod;
The bimetal and the thermal element can both receive the current passing through the moving contact system to generate heat, and the bimetal generates deformation through self-heating and/or the heat of the thermal element, so that the delay adjusting screw touches a traction rod of the circuit breaker and cuts off a circuit;
The magnetic yoke can generate a magnetic field which overcomes the elastic force so that the acting end of the armature touches the traction rod and cuts off the magnetic field of the circuit.
In one embodiment of the utility model, a first soft coupling is connected between the moving contact system and the thermal element, and a second soft coupling is connected between the moving contact system and the bimetallic strip.
In one embodiment of the present utility model, the contact terminal includes a main plane and a connection end extending in a bending manner on the main plane, the thermal element and the bimetal are respectively riveted on the connection end through a first rivet, and the thermal element and the bimetal are closely arranged.
In one embodiment of the present utility model, the bimetal is disposed in parallel to the main plane.
In one embodiment of the utility model, the yoke is riveted to the main plane by a second rivet.
In one embodiment of the utility model, the two side ends of the armature support are provided with rotating supports, and the two side ends of the armature are extended with rotating arms which are in rotating fit with the rotating supports.
In one embodiment of the utility model, a first spring connecting arm extends from the side end of the armature bracket, a second spring connecting arm and a touch plate are respectively connected to the upper end and the lower end of the armature, the action end of the armature is configured as the touch plate, and two ends of the instant spring are respectively connected to the first spring connecting arm and the second spring connecting arm.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
The tripping protection system for improving the rated current of the molded case circuit breaker has a compact structure, is particularly suitable for small molded case circuit breakers, and enables the small molded case circuit breaker to achieve the effect of improving the tripping reliability and breaking performance of the thermomagnetic tripping protection system under the original appearance of the molded case circuit breaker, thereby improving the rated current of the molded case circuit breaker, and having the advantages of low cost, good universality and high cost performance.
The tripping protection system improves the reliability of overcurrent and instantaneous tripping, improves the breaking performance of the molded case circuit breaker, and improves the rated current upper limit of the molded case circuit breaker.
Drawings
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
Fig. 1 is a schematic diagram of an overcurrent trip system according to the present utility model.
Fig. 2 is a schematic diagram of the instantaneous trip system of the present utility model.
Fig. 3 is an assembled schematic diagram of the overcurrent trip system and instantaneous trip system of the present utility model.
Description of the specification reference numerals:
100. An overcurrent trip system; 200. an instantaneous trip system;
1. A moving contact system; 11. a first soft coupling; 12. a second soft coupling;
2. a contact terminal; 21. a principal plane; 22. a connection end; 23. a first rivet; 24. a second rivet;
3. A thermal element;
4. Bimetallic strips;
5. a delay adjusting screw;
6. A yoke;
7. an armature bracket; 71. rotating the support; 72. a first spring connecting arm;
8. an armature; 81. a rotating arm; 82. a second spring connecting arm; 83. a touch plate;
9. a transient spring.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.
In the present utility model, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present utility model, and do not indicate or imply that the technical features must be in a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present utility model, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present utility model, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1 to 3, a trip protection system for improving rated current of a molded case circuit breaker according to the present utility model includes:
The overcurrent tripping system 100 comprises a moving contact system 1, a contact terminal 2, a thermal element 3 and a bimetallic strip 4, wherein the thermal element 3 and the bimetallic strip 4 are respectively connected between the moving contact system 1 and the contact terminal 2, and a delay adjusting screw 5 positioned beside a traction rod of a circuit breaker is connected to the bimetallic strip 4;
The instantaneous trip system 200 comprises a magnetic yoke 6 connected to the contact terminal 2, an armature bracket 7, an armature 8 rotatably connected to the armature bracket 7 and matched with the magnetic yoke 6, and an instantaneous spring 9 connected between the armature bracket 7 and the armature 8, wherein the armature 8 is positioned beside the traction rod, and the instantaneous spring 9 provides an elastic force for rotating the acting end of the armature 8 away from the traction rod;
Wherein, the bimetallic strip 4 and the thermal element 3 can both receive the current passing through the moving contact system 1 to generate heat, and the bimetallic strip 4 generates deformation through self-heating and/or receiving the heat of the thermal element 3, so that the delay adjusting screw 5 touches a breaker traction rod and cuts off a circuit;
The yoke 6 is able to generate a magnetic field that overcomes the elastic force, so that the active end of the armature 8 touches the traction rod and cuts off the magnetic field of the circuit.
Specifically, a first soft connection 11 is connected between the moving contact system 1 and the thermal element 3, a second soft connection 12 is connected between the moving contact system 1 and the bimetallic strip 4, the first soft connection 11 is larger, the second soft connection 12 is smaller, good conductivity is ensured through welding, and current diversion is adjusted through the large soft connection and the small soft connection, so that the bimetallic strip 4 cannot excessively heat to influence the performance, and the requirement on the resistance value of the thermal element 3 can be reduced.
Specifically, the contact terminal 2 includes a main plane 21 and a connection end 22 extending in a bending manner from the main plane 21, the thermal element 3 and the bimetal 4 are respectively riveted to the connection end 22 through a first rivet 23, the thermal element 3 and the bimetal 4 are tightly attached to each other, and the bimetal 4 is arranged in parallel to the main plane 21 so as to ensure the stability of the overcurrent tripping performance.
Specifically, the yoke 6 is riveted to the main plane 21 through the second rivet 24, so as to strengthen the stability of the yoke 6 to cope with the large current during the instantaneous trip, and strengthen the reliability of the instantaneous trip; the two side ends of the armature bracket 7 are provided with rotating supports 71, and the two side ends of the armature 8 are extended with rotating arms 81 which are in rotating fit with the rotating supports 71.
Specifically, the side end of the armature bracket 7 extends to form a first spring connecting arm 72, the upper end and the lower end of the armature 8 are respectively connected to a second spring connecting arm 82 and a touch plate 83, the acting end of the armature 8 is configured as the touch plate 83, and the two ends of the instant spring 9 are respectively connected to the first spring connecting arm 72 and the second spring connecting arm 82, so as to correspond to different rated currents by replacing different instant springs 9.
When assembled, the overcurrent trip system 100 is fixed to the circuit breaker base through the contact terminals 2, and the instantaneous trip system 200 is fixed to the circuit breaker base through the armature bracket 7. When the current is normal, the current passes through the movable contact system 1, and then is split through a first soft coupling 11 and a second soft coupling 12, and flows to the contact terminal 2 from the thermal element 3 and the bimetallic strip 4. When overcurrent is generated, when the current reaches the thermal element 3 and the bimetallic strip 4, the thermal element 3 and the bimetallic strip 4 generate heat at the same time, so that the bimetallic strip 4 generates a large amount of deformation, the overcurrent continuously reaches a certain time, and the delay adjusting screw 5 triggers the traction rod driving mechanism to cut off a circuit. When the rated current which is 8-12 times of the rated current passes, the magnet yoke 6 generates a large magnetic field to enable the armature 8 to rotate rapidly, so that the traction rod is triggered to cut off a circuit.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.
Claims (7)
1. A trip protection system for improving rated current of a molded case circuit breaker, comprising:
The overcurrent tripping system (100) comprises a moving contact system (1), a contact terminal (2), and a thermal element (3) and a bimetallic strip (4) which are respectively connected between the moving contact system (1) and the contact terminal (2), wherein the bimetallic strip (4) is connected with a delay adjusting screw (5) positioned beside a traction rod of the circuit breaker;
The instantaneous tripping system (200) comprises a magnetic yoke (6) connected to the contact terminal (2), an armature bracket (7), an armature (8) rotatably connected to the armature bracket (7) and matched with the magnetic yoke (6), and an instantaneous spring (9) connected between the armature bracket (7) and the armature (8), wherein the armature (8) is positioned beside the traction rod, and the instantaneous spring (9) provides an elastic force for rotating the acting end of the armature (8) away from the traction rod;
wherein, the bimetallic strip (4) and the thermal element (3) can both receive the current passing through the moving contact system (1) to generate heat, and the bimetallic strip (4) generates deformation through self-heating and/or receiving the heat of the thermal element (3), so that the delay adjusting screw (5) touches a traction rod of the circuit breaker and cuts off a circuit;
The magnetic yoke (6) is capable of generating a magnetic field that overcomes the elastic force, so that the active end of the armature (8) touches the traction rod and cuts off the magnetic field of the circuit.
2. Trip protection system for improving the rated current of a molded case circuit breaker according to claim 1, characterized in that a first soft coupling (11) is connected between the moving contact system (1) and the thermal element (3), and a second soft coupling (12) is connected between the moving contact system (1) and the bimetallic strip (4).
3. Trip protection system for improving the rated current of a molded case circuit breaker according to claim 1, characterized in that the contact terminal (2) comprises a main plane (21) and a connecting end (22) bent and extended to the main plane (21), the thermal element (3) and the bimetal (4) are respectively riveted to the connecting end (22) by a first rivet (23), and the thermal element (3) and the bimetal (4) are closely arranged.
4. A trip protection system for improving rated current of a molded case circuit breaker according to claim 3, characterized in that the bimetal (4) is arranged in parallel to the main plane (21).
5. A trip protection system for increasing the rated current of a molded case circuit breaker according to claim 3, characterized in that the yoke (6) is riveted to the main plane (21) by means of a second rivet (24).
6. Trip protection system for improving rated current of molded case circuit breaker according to claim 1, characterized in that the armature bracket (7) is provided with a rotating support (71) at both side ends, and the armature (8) is extended with a rotating arm (81) in rotating fit with the rotating support (71) at both side ends.
7. The trip protection system for improving rated current of a molded case circuit breaker according to claim 1, wherein a first spring connecting arm (72) extends from a side end of the armature bracket (7), a second spring connecting arm (82) and a trigger plate (83) are respectively connected to an upper end and a lower end of the armature (8), an acting end of the armature (8) is configured as the trigger plate (83), and two ends of the transient spring (9) are respectively connected to the first spring connecting arm (72) and the second spring connecting arm (82).
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221327629U true CN221327629U (en) | 2024-07-12 |
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