CN219759504U - Magnetic tripping device and circuit breaker with same - Google Patents
Magnetic tripping device and circuit breaker with same Download PDFInfo
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- CN219759504U CN219759504U CN202320876484.0U CN202320876484U CN219759504U CN 219759504 U CN219759504 U CN 219759504U CN 202320876484 U CN202320876484 U CN 202320876484U CN 219759504 U CN219759504 U CN 219759504U
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- 125000006850 spacer group Chemical group 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 3
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- 101000581533 Homo sapiens Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial Proteins 0.000 description 2
- 102100027320 Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial Human genes 0.000 description 2
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Abstract
The present utility model provides a magnetic trip device for driving a trip mechanism of a circuit breaker by inducing current in a conductor to generate electromagnetic force, the magnetic trip device comprising: a yoke fixedly provided; the movable armature is arranged opposite to the magnetic yoke and is configured to move towards the magnetic yoke from an initial position to a tripping position under the action of electromagnetic force, the tripping mechanism is not triggered by the movable armature in the initial position, and the tripping mechanism is triggered by the movable armature in the tripping position; the permanent magnet is fixedly arranged relative to the movable armature, when the movable armature is in an initial position, the permanent magnet is positioned on the movable armature to exert magnetic attraction force on the movable armature, under the action of electromagnetic force, the movable armature moves from the initial position towards a release position far away from the permanent magnet against the magnetic attraction force of the permanent magnet, and when the movable armature moves to a certain distance away from the permanent magnet, the movable armature is not acted by the magnetic attraction force of the permanent magnet. The magnetic tripping device not only ensures that the magnetic tripping mechanism is started when reaching the starting threshold value, but also ensures that the tripping action is quick and reliable.
Description
Technical Field
The utility model relates to a magnetic tripping device and a circuit breaker with the same.
Background
The magnetic trip device is one of the components that make up a molded case circuit breaker. The magnetic tripping device of the existing molded case circuit breaker (for short, MCCB) consists of a conductor, a movable armature, a magnetic yoke, a push rod, a counter-force spring and the like. When overcurrent is generated in a system circuit and reaches a tripping threshold value, current flows through a conductor, electromagnetic force is generated between the movable armature and the magnetic yoke due to electromagnetic induction, the movable armature moves towards the magnetic yoke direction against spring resistance under the action of the electromagnetic force, and a push rod which moves along with the movable armature triggers a tripping mechanism of the circuit breaker to finish tripping and breaking functions, so that fault current is cut off, and equipment safety is guaranteed.
In the process that the movable armature moves towards the magnetic yoke, the counter-force spring generates continuously-increased restoring force due to being stretched or compressed, so that a part of electromagnetic force can be counteracted, the movement of the movable armature is blocked, the tripping is difficult, the breaking energy of the molded case circuit breaker is larger, and the breaking difficulty is increased.
Disclosure of Invention
Accordingly, in view of the above problems, the present utility model provides a magnetic trip device and a circuit breaker having the same that are optimized in structure.
The present utility model provides a magnetic trip device for driving a trip mechanism of a circuit breaker by inducing current in a conductor to generate electromagnetic force, characterized in that the magnetic trip device comprises: a yoke fixedly provided; the movable armature is arranged opposite to the magnetic yoke and is configured to move towards the magnetic yoke from an initial position to a release position under the action of electromagnetic force, the release mechanism is not triggered by the movable armature in the initial position, and the release mechanism is triggered by the movable armature in the release position; the permanent magnet is fixedly arranged relative to the movable armature, when the movable armature is in an initial position, the permanent magnet is positioned on the movable armature to exert magnetic attraction force on the movable armature, under the action of electromagnetic force, the movable armature moves from the initial position towards a release position far away from the permanent magnet against the magnetic attraction force of the permanent magnet, and when the movable armature moves to a certain distance away from the permanent magnet, the movable armature is not acted by the magnetic attraction force of the permanent magnet.
In one embodiment, the permanent magnet is in direct contact with the moving armature.
In one embodiment, a gap is provided between the permanent magnet and the moving armature.
In one embodiment, the size of the gap is determined by the magnetic trip threshold.
In an embodiment, spacers are provided at the gaps such that the size of the gaps is determined by the thickness of the spacers.
In one embodiment, the spacer is a copper spacer, an aluminum spacer, or a plastic spacer.
In one embodiment, the moving armature actuates the trip mechanism by linear motion.
In one embodiment, the moving armature actuates the trip mechanism through a swinging motion.
In one embodiment, the yoke is shaped as a U-shaped structure and comprises two ends protruding towards the moving armature, at least one of the two ends having a first pole face facing the moving armature; the movable armature is shaped in a U-shaped structure and comprises two ends protruding towards the magnetic yoke, at least one of the two ends having a second pole face corresponding to the first pole face and facing the magnetic yoke; the first pole face and the second pole face each other in the movement direction of the moving armature and do not overlap; when the moving armature moves to the release position, the two ends of the magnetic yoke are completely inserted into the U-shaped structure of the moving armature.
In one embodiment, the magnetic trip device further comprises: an unlocking component for triggering the tripping mechanism according to the movement of the movable armature; the guide rod is fixedly connected with the movable armature, and the unlocking member is connected to the guide rod in a penetrating manner; a support member fixedly disposed above the moving armature, a guide rod passing through the support member to be fixedly connected to the moving armature, and a permanent magnet fixed on the support member and located between the support member and the moving armature; and the return spring is connected to the guide rod in a penetrating way, so that one end of the return spring abuts against the unlocking member, the other end of the return spring abuts against the supporting member, and when the movable armature moves under the action of electromagnetic force, the unlocking member is driven to trigger the tripping mechanism and compress the return spring, so that the return spring has a restoring force.
The utility model also provides a circuit breaker, comprising: a trip mechanism; and the magnetic trip device.
The utility model has the advantages that the permanent magnet is arranged in the magnetic tripping device and is used for providing the initial magnetic attraction force for the movable armature to resist vibration, and when the movable armature overcomes the initial magnetic attraction force under the action of electromagnetic force and moves towards the magnetic yoke for a certain distance, the movable armature is not subjected to the action of the magnetic attraction force, so that the magnetic tripping mechanism can be ensured to be started when reaching a starting threshold value, and acceleration is not reduced in tripping movement, and the breaking rapidity of the circuit breaker and the reliability of the tripping process are ensured.
Drawings
FIG. 1 is a schematic diagram of a magnetic trip device according to an embodiment of the present utility model;
FIG. 2 is a partial front view of a magnetic trip device of an embodiment of the present utility model;
FIG. 3 is a partial front view of a magnetic trip device of another embodiment of the present utility model;
FIG. 4 is a partial front view of the magnetic trip device of the present utility model in a tripped position;
fig. 5 is a force-displacement graph of the magnetic trip device of the present utility model.
Detailed Description
Fig. 1 shows a magnetic trip device according to the present utility model. Referring to fig. 1, a magnetic trip device 1 of the present utility model is used in a circuit breaker (not shown), and is particularly suitable for use in MCCB, which is a device for driving a trip mechanism in the circuit breaker to perform trip and breaking functions. The magnetic trip device 1 mainly includes: yoke 11, moving armature 12 and permanent magnet 15. Wherein the magnet yoke 11 and the moving armature 12 are arranged opposite to each other, and the conductor 21 passes through the magnet yoke 11 and is fixedly arranged together with the magnet yoke 11. When a large current is passed through the conductor 21, an electromagnetic attraction force is generated between the moving armature 12 and the yoke 11 due to an electromagnetic induction phenomenon. Under the action of electromagnetic attraction, the movable armature 12 moves from an initial position to a trip position towards the magnetic yoke 11 to drive a trip mechanism on the circuit breaker, thereby realizing a trip function. When the moving armature 12 is in the initial position, a permanent magnet 15 is provided on the moving armature 12 to exert a magnetic attraction force on the moving armature 12. Under the influence of electromagnetic force, the moving armature 12 moves toward the trip position away from the permanent magnet against the magnetic attraction of the permanent magnet. When the moving armature 12 moves to a distance away from the permanent magnet 15, the moving armature 12 will not be acted upon by the magnetic attraction of the permanent magnet 15. A specific embodiment will be further described below.
Please refer to fig. 1, fig. 1 is a schematic diagram illustrating a magnetic trip device according to an embodiment of the present utility model. In the present embodiment, the trip operation of the magnetic trip device is completed by the yoke 11, the moving armature 12, the supporting member 13, the guide bar 14, the permanent magnet 15, and the unlocking member 17. The yoke 11 is arranged below the moving armature 12, is shaped as a U-shaped structure and comprises two ends protruding towards the moving armature 12, each end having a first pole face facing the moving armature 12. The moving armature 12 is shaped as a U-shaped structure and comprises two ends protruding towards the yoke 11, each end having a second pole face facing the yoke 11. The first and second pole faces face each other in the direction of movement (e.g., vertical direction) of the moving armature and do not overlap such that when the moving armature 12 moves toward the yoke 11 to the tripped position, the protruding end of the yoke 11 is fully inserted inside the U-shaped structure of the moving armature 12.
A support member 13 is fixed within the circuit breaker and above the moving armature 12, and one end of a guide rod 14 passes through the support member 13 and is fixedly connected to the moving armature 12 such that the support member 13 can guide the guide rod 14. The permanent magnet 15 is fixedly arranged. For example, a permanent magnet 15 is fixed to the support member 13 and is located between the support member 13 and the movable armature 12 for exerting a magnetic attraction force (also referred to as detent force) on the movable armature 12. When vibration occurs or the current in the circuit breaker does not reach the trip threshold, the moving armature 12 is maintained at the initial position by the magnetic attraction force of the permanent magnet 15 without movement, thereby preventing vibration trip or accidental trip. The unlocking member 17 is coupled to the other end of the guide rod 14 in a penetrating manner so that the unlocking member 17 can follow the movement of the guide rod 14 and the moving armature 12. When the movable armature 12 moves towards the magnetic yoke 11 to the trip position under the action of electromagnetic force, the unlocking member 17 triggers the trip mechanism of the circuit breaker under the drive of the movable armature 12 and the guide rod 14, so that the trip operation is completed.
Further, the magnetic poles of the permanent magnet 15 may be arbitrarily set. For example, magnetic poles N and S are provided on both sides of the permanent magnet 15 in the moving direction (for example, the vertical direction) of the movable armature 12, respectively. The magnitude of the magnetic force of the permanent magnet 15 may be determined by the magnetic trip threshold of the circuit breaker, i.e. by adjusting the magnetic force of the permanent magnet 15, different magnetic trip thresholds may be obtained, which are suitable for different electrical devices.
Fig. 2 is a partial front view of a magnetic trip device according to an embodiment of the present utility model, and fig. 3 is a partial front view of a magnetic trip device according to another embodiment of the present utility model. In both fig. 2 and 3, the moving armature 12 is in the initial position. Referring to fig. 2, the permanent magnet 15 may be disposed with a gap from the moving armature 12. By adjusting the size of the gap, the magnetic trip threshold of the circuit breaker can be adjusted. For example, the smaller the gap between the permanent magnet 15 and the moving armature 12, the greater the magnetic trip threshold of the circuit breaker and vice versa. Furthermore, a spacer 18 may be provided at the gap between the permanent magnet 15 and the moving armature 12 for providing a stable and reliable gap. The size of this gap is determined by the thickness of the spacer 18. The spacers 18 are, for example, copper spacers, aluminum spacers or plastic spacers. In another embodiment, referring to fig. 3, the permanent magnet 15 may be configured to directly contact the armature 12, thereby imparting its maximum magnetic attraction to the moving armature 12.
With continued reference to fig. 1, the magnetic trip device 1 further includes a return spring 16 that is disposed through the guide rod 14 for returning the moving armature 12. Specifically, one end of the return spring 16 abuts on the unlocking member 17, and the other end abuts on the supporting member 13, and when the unlocking member 17 moves downward following the moving armature 12 and activates the trip mechanism, the return spring 16 is compressed to have a restoring force. After the trip operation is completed, the movable armature 12 moves upward by the restoring force of the return spring 16, gradually moves away from the yoke 11, and finally returns to the initial position. In the magnetic trip device of the present utility model, since the movable armature 12 is kept stationary at the initial position mainly by the magnetic attraction force of the permanent magnet 15 instead of the spring resistance, a softer return spring 16 can be used in cooperation. Such a configuration may be suitable for a magnetic trip device of a smaller electromagnetic force.
The course of movement of the moving armature of the magnetic trip device is described below in connection with fig. 3, 4 and 5. Fig. 3 shows a state in which the moving armature is not moved but is in an initial position, fig. 4 shows a state in which the moving armature is moved to a trip position, and fig. 5 shows a force-displacement graph of the magnetic trip device. As shown in fig. 3, when the movable armature 12 is in the initial position, the movable armature 12 is mainly acted upon by the magnetic attraction force of the permanent magnet 15 to resist vibration and remain stationary. When the system circuit fails to cause excessive current to flow through the conductor 12 and reaches the trip threshold, as shown in fig. 4, the electromagnetic force generated between the moving armature 12 and the yoke 11 will be greater than the magnetic attraction force (also referred to as detent force) of the permanent magnet 15 to drive the moving armature 12 downward to the trip position. As shown in fig. 5, as the distance between the moving armature 12 and the permanent magnet 15 increases, the magnetic attraction force of the permanent magnet 15 to the moving armature 12 decreases to 0. At this time, the moving armature 12 is not subjected to the magnetic attraction force. After that, only small spring resistance is needed to overcome by the downward movement of the movable armature 12, so that the downward movement speed of the movable armature 12 is high, the unlocking member 17 following the movement of the movable armature 12 also moves fast, and when the movable armature 12 reaches the release position, the unlocking member 17 quickly triggers the release mechanism of the circuit breaker to complete the release action, so that the circuit breaker is quickly broken, and the effect of quickly cutting off a system circuit is realized. As can be seen, the moving armature 12 can move and trip quickly, with a more reliable trip process, as long as the initial magnetic attraction is overcome.
After the magnetic tripping device 1 completes the breaking task of the circuit breaker, the return spring 16 performs a return action, and the movable armature 12 is driven by the restoring force of the return spring 16 to move upwards, away from the magnetic yoke 11 and gradually approaching the permanent magnet 15. When the moving armature 12 moves to a distance smaller than a certain distance from the permanent magnet 15, the permanent magnet 15 has magnetic attraction to the moving armature 12 and gradually increases. Finally, the movable armature 12 is restored to the initial position by the combined action of the return spring 16 and the permanent magnet 15, and the return action is completed. Thus, the movable armature 12 can be quickly returned for the next tripping and breaking.
Besides the movable magnetic tripping device provided by the embodiment, the permanent magnet can also be applied to the swing type magnetic tripping device, and the magnetic yoke attracts the movable armature to swing so as to trigger the tripping mechanism, and the movable armature resets under the action of the torsion spring. When the movable armature is in the initial position and does not move, the permanent magnet is positioned on the movable armature to apply magnetic attraction force to the movable armature, and when the movable armature swings towards the magnetic yoke to be far away from the permanent magnet under the action of electromagnetic force, the movable armature is not acted by the magnetic force of the permanent magnet.
While the present utility model has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present utility model as defined by the following claims.
Claims (11)
1. A magnetic trip device for driving a trip mechanism of a circuit breaker by inducing a current in a conductor to generate an electromagnetic force, the magnetic trip device comprising:
a yoke fixedly provided;
the movable armature is arranged opposite to the magnetic yoke and is configured to move towards the magnetic yoke from an initial position to a release position under the action of the electromagnetic force, the movable armature does not trigger the release mechanism in the initial position, and the movable armature triggers the release mechanism in the release position;
the permanent magnet is fixedly arranged relative to the movable armature, is positioned on the movable armature when the movable armature is positioned at the initial position so as to exert magnetic attraction action on the movable armature,
under the action of the electromagnetic force, the movable armature moves from the initial position towards the tripping position far away from the permanent magnet against the magnetic attraction of the permanent magnet, and when the movable armature moves to a certain distance away from the permanent magnet, the movable armature is not affected by the magnetic attraction of the permanent magnet.
2. The magnetic trip device of claim 1, wherein the permanent magnet is in direct contact with the moving armature.
3. The magnetic trip unit of claim 1, wherein said permanent magnet has a gap with said moving armature.
4. The magnetic trip device of claim 3, wherein the size of the gap is determined by a magnetic trip threshold.
5. The magnetic trip device of claim 3, wherein spacers are provided at the gaps such that the size of the gaps is determined by the thickness of the spacers.
6. The magnetic trip device of claim 5, wherein the spacer is a copper spacer, an aluminum spacer, or a plastic spacer.
7. The magnetic trip device of claim 1, wherein the moving armature actuates the trip mechanism by linear motion.
8. The magnetic trip device of claim 1, wherein the moving armature actuates the trip mechanism by a swinging motion.
9. The magnetic trip unit according to claim 7, wherein,
the yoke is shaped as a U-shaped structure and comprises two ends protruding towards the moving armature, at least one of the two ends having a first pole face facing the moving armature,
the moving armature is formed in a U-shaped structure and includes two ends protruding toward the yoke, at least one of the two ends having a second pole face corresponding to the first pole face and facing the yoke,
the first pole face and the second pole face each other in the direction of movement of the moving armature and do not overlap,
when the moving armature moves to the release position, the two ends of the magnetic yoke are completely inserted into the U-shaped structure of the moving armature.
10. The magnetic trip device according to claim 9, further comprising:
an unlocking member for triggering the trip mechanism according to the movement of the movable armature;
the guide rod is fixedly connected with the movable armature, and the unlocking member is connected to the guide rod in a penetrating manner;
a support member fixedly disposed above the moving armature, the guide rod passing through the support member to be fixedly connected to the moving armature, the permanent magnet being fixed on the support member and located between the support member and the moving armature; and
a return spring which is connected to the guide rod in a penetrating manner so that one end of the return spring abuts against the unlocking member and the other end abuts against the supporting member,
when the movable armature moves under the action of electromagnetic force, the unlocking member is driven to trigger the tripping mechanism and compress the return spring, so that the return spring has a restoring force.
11. A circuit breaker, the circuit breaker comprising:
a trip mechanism; and
the magnetic trip unit of any one of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320876484.0U CN219759504U (en) | 2023-04-18 | 2023-04-18 | Magnetic tripping device and circuit breaker with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320876484.0U CN219759504U (en) | 2023-04-18 | 2023-04-18 | Magnetic tripping device and circuit breaker with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219759504U true CN219759504U (en) | 2023-09-26 |
Family
ID=88073019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320876484.0U Active CN219759504U (en) | 2023-04-18 | 2023-04-18 | Magnetic tripping device and circuit breaker with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219759504U (en) |
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2023
- 2023-04-18 CN CN202320876484.0U patent/CN219759504U/en active Active
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