Electromagnetic release and circuit breaker
The separate design of the core assembly and yoke with a snap-on mechanism and integrated static contact in the circuit breaker simplifies production, allowing for easy assembly and maintenance, while the compact current transformer enhances efficiency and miniaturization.
Patent Information
- Application Number
- CN202420810621.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-18
AI Technical Summary
Traditional miniature circuit breakers have complex electromagnetic releases with many components, making them difficult and costly to produce, and the current sampling devices are large, hindering miniaturization and modular production.
The electromagnetic release features a separate design of the core assembly and yoke with a snap-on mechanism, integrating a static contact and arc-starting plate, and uses a compact current transformer for current detection.
This design improves production efficiency, enables easy replacement and rapid assembly, reduces component count, and results in a more compact, efficient, and easily upgradable circuit breaker.
Smart Images
Figure CN222168308U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to electronic equipment, and in particular to an electromagnetic release and a circuit breaker. Background Art
[0002] In the field of miniature circuit breakers, short-circuit protection is an important function to ensure the safe operation of circuits. Traditional miniature circuit breakers achieve this function through built-in electromagnetic releases. When the current flowing through the circuit breaker reaches or exceeds the preset short-circuit current threshold, the electromagnetic release triggers the tripping mechanism, causing the circuit breaker to disconnect quickly, thereby preventing downstream equipment from being damaged by excessive current. However, the electromagnetic release of the prior art has a complex structure and involves many matching components, which not only increases the difficulty and cost of production, but also makes it impossible to separate the core assembly from the yoke 1, hindering the possibility of modular production and rapid assembly. In addition, the existing current sampling devices are large in size, such as manganese copper shunts, which are not convenient for miniaturization design and occupy a large space.
[0003] Therefore, how to simplify the structure of the electromagnetic release and separate the core assembly from the yoke 1 becomes an urgent problem to be solved. Summary of the invention
[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present disclosure is to provide an electromagnetic release and a circuit breaker to achieve a separate design of the core assembly and the yoke 1.
[0005] The first aspect of the present disclosure provides an electromagnetic release, including a yoke and an iron core assembly, wherein the yoke is a rectangular structure, and a coaxial circular hole is provided on each of the left and right sides, and a square notch is provided on the circumferential side wall of one of the circular holes; the iron core assembly includes a coil, a coil frame, a moving iron core, a stationary iron core, a push rod, and a spring; wherein the coil is wound on the coil frame; a limit block is provided on the coil frame that is adapted to the square notch of the yoke, so that the iron core assembly is fixed in the yoke when the limit block is embedded in the square notch; the moving iron core and the stationary iron core are both arranged inside the coil frame, and the spring is installed between the moving iron core and the stationary iron core; one end of the push rod is in contact with the moving iron core, and the other end passes through the through hole of the stationary iron core and extends out of the coil frame, so as to respond to the movement of the moving iron core and trigger the tripping operation.
[0006] In an embodiment of the first aspect, a groove is provided on the moving iron core for accommodating part of the push rod; the spring is sleeved on the push rod, one end of the spring is placed in the groove, and the other end abuts against the stationary iron core.
[0007] In an embodiment of the first aspect, one side of the circular hole of the magnetic yoke extends downward to form a static contact, an arc-starting plate is provided under the magnetic yoke, and the arc-starting plate is integrally designed with the static contact.
[0008] In an embodiment of the first aspect, the moving iron core is installed in the coil frame by a clearance fit so as to have a vertical displacement under the action of a magnetic field; and the static iron core is fixed in the coil frame by an interference fit.
[0009] In an embodiment of the first aspect, the push rod passes through the through hole of the static iron core through clearance fit, so as to respond to the movement of the moving iron core and trigger a tripping operation.
[0010] In an embodiment of the first aspect, the coil is composed of a copper solenoid, with two ends respectively led out, and the led-out ends are perpendicular to each other; one end is fixedly connected to the magnetic yoke by welding.
[0011] A second aspect of the present disclosure provides a circuit breaker, comprising a connecting plate, a current sampling device, and a moving contact, such as the electromagnetic release described in any embodiment of the first aspect, wherein the current sampling device is installed between the connecting plate and the electromagnetic release, and is provided with an inner ring hole for the connecting plate to pass through for external wiring; when the current sampling device detects an abnormal external current, the electromagnetic release is triggered to operate, pushing the moving contact to disengage.
[0012] In an embodiment of the second aspect, the current sampling device is a current transformer.
[0013] In an embodiment of the second aspect, the inner ring aperture of the current transformer is ≦15 mm.
[0014] In an embodiment of the second aspect, the connecting plate is electrically connected to one end of the coil in the electromagnetic release by welding.
[0015] As described above, the electromagnetic release provided in the embodiment of the present disclosure adopts a separate design for the core assembly and the yoke, and introduces a snap-on matching mechanism. This design not only improves production efficiency, but also enables easy replacement of the core and yoke, and also provides great convenience for rapid assembly and later maintenance. In addition, the integrated design of the static contact, yoke, and arc-starting plate reduces the steps in the manufacturing process, thereby effectively improving production efficiency. In addition, the current transformer has high-precision current detection capabilities and occupies a smaller volume, making the entire circuit breaker more compact, efficient, and easy to upgrade to intelligence. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the structure of a magnetic yoke in one embodiment of the present disclosure is shown.
[0017] Figure 2 A schematic structural diagram of an iron core assembly in one embodiment of the present disclosure is shown.
[0018] Figure 3A schematic structural diagram of a circuit breaker in an embodiment of the present disclosure is shown.
[0019] Figure 4 A schematic diagram of the connection structure of an electromagnetic release in one embodiment of the present disclosure is shown.
[0020] Component number description
[0021] Yoke 1
[0022] Round hole 11
[0023] Square notch 12
[0024] Stationary contact 13
[0025] Arc starter plate 14
[0026] Core assembly 2
[0027] Coil 21
[0028] Coil end 211
[0029] Coil end 212
[0030] Coil skeleton 22
[0031] Limit block 221
[0032] Moving iron core 23
[0033] Static iron core 24
[0034] Ejector 25
[0035] Spring 26
[0036] Groove 27
[0037] Connecting plate 3
[0038] Current sampling device 4
[0039] Inner ring hole 41
[0040] Moving contact 5 DETAILED DESCRIPTION
[0041] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.
[0042] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.
[0043] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.
[0044] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.
[0045] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.
[0046] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0047] The present invention provides an electromagnetic tripping structure, comprising a yoke 1 and an iron core component 2.
[0048] like Figure 1 The above is a schematic diagram of the structure of the magnetic yoke. The magnetic yoke 1 is a rectangular structure, with a coaxial circular hole 11 on each of the left and right sides, and a square notch 12 is opened on the circumferential side wall of one of the circular holes 11.
[0049] like Figure 2 , which is a schematic diagram of the structure of the core assembly, the core assembly 2 includes a coil 21, a coil skeleton 22, a moving iron core 23, a static iron core 24, a push rod 25, and a spring 26.
[0050] The coil frame 22 is provided with a stopper 221 matched with the square notch 12 of the yoke 1 , so that the core assembly 2 is fixed in the yoke 1 when the stopper 221 is inserted into the square notch 12 .
[0051] The core assembly is designed to be separated from the yoke 1 and fixed with a snap-fit mechanism. This design not only improves production efficiency, but also enables easy replacement of the core and yoke, and also provides great convenience for rapid assembly and subsequent maintenance.
[0052] The moving iron core 23 and the static iron core 24 are both disposed inside the coil skeleton 22 , and the spring 26 is installed between the moving iron core 23 and the static iron core 24 .
[0053] In some embodiments, the moving iron core 23 is installed in the coil frame 22 by a clearance fit, and is used for vertical displacement under the action of a magnetic field; the static iron core 24 is fixed in the coil frame 22 by an interference fit.
[0054] Specifically, the moving iron core 23 needs to move relative to the coil frame 22 under certain conditions to achieve the opening and closing of the circuit breaker. The clearance fit allows the moving iron core 23 to move freely under the action of electromagnetic force. This design can ensure that when the current exceeds the normal value, the moving iron core can be quickly attracted to the static iron core, triggering the tripping mechanism to trip the circuit breaker, thereby protecting the circuit. The static iron core 24 is usually fixed, and its interference fit with the coil frame 22 can ensure good contact performance and mechanical strength. The interference fit helps to ensure a firm connection between the static iron core and the coil frame, and will not loosen due to long-term use or vibration.
[0055] One end of the push rod 25 contacts the moving iron core 23 , and the other end passes through the through hole of the stationary iron core 24 and extends out of the coil skeleton 22 , so as to respond to the movement of the moving iron core 23 and trigger the tripping operation.
[0056] In some embodiments, a groove 27 is provided on the moving iron core 23 for accommodating part of the push rod 25 ; the spring 26 is sleeved on the push rod 25 , with one end of the spring 26 placed in the groove 27 and the other end abutting against the stationary iron core 24 .
[0057] Furthermore, the push rod 25 passes through the through hole of the static iron core 24 through clearance fit, so as to respond to the movement of the moving iron core 23 and trigger the tripping operation.
[0058] Specifically, under normal circumstances, a certain gap is maintained between the static iron core 24 and the moving iron core 23 through the spring 26. This gap is to ensure that the moving and static iron cores will not contact each other in the absence of overcurrent, thereby maintaining the closed state of the circuit. When an overcurrent or short circuit occurs in the circuit, the magnetic field generated by the coil 21 will attract the moving iron core 23 to move upward. At this time, the spring 26 is compressed, and the moving iron core 23 contacts the static iron core 24, causing the circuit to be disconnected, thereby protecting the circuit from the influence of overcurrent or short circuit. One end of the push rod 25 is connected to the moving iron core 23, and the other end extends out of the coil skeleton 22 and is connected to the tripping mechanism in the circuit breaker. When the moving iron core 23 is attracted to move upward, this action is transmitted to the tripping mechanism through the push rod 25, triggering the circuit breaking action of the circuit breaker.
[0059] The static head system of the circuit breaker includes a static contact 13 and an arc-starting plate 14, wherein the static contact 13 corresponds to the moving contact 5 and is used to complete the connection and disconnection of the circuit; the arc-starting plate 14 is used to guide the arc during the breaking process, help extinguish the arc, reduce the damage of the arc to the contacts, and improve the service life of the circuit breaker. In order to simplify the structure of the static head system of the circuit breaker, in some embodiments, the yoke 1 has a circular hole 11 extending downward on one side to form a static contact 13, and an arc-starting plate 14 is provided below the yoke 1, and the arc-starting plate 14 is designed as an integral whole with the static contact 13.
[0060] The integrated design of the yoke, static contact and arc-starting plate not only simplifies the structure, but also reduces the parts and production processes, thereby improving production efficiency.
[0061] The coil 21 is wound on the coil frame 22. In order to ensure that the end of the coil 21 can have good electrical contact with the yoke 1 during welding, in some embodiments, the coil 21 is composed of a copper solenoid, and the two ends 211 and 212 are respectively led out, and the led-out ends are perpendicular to each other; one end 211 is fixedly connected to the yoke 1 by welding.
[0062] Specifically, the paint at both ends of the coil 21 can be stripped 5 to 10 mm, and one end 211 can be welded to the yoke 1 to enhance the structural stability of the entire electromagnetic release and improve the overall durability and reliability of the circuit breaker. The design of the two ends of the coil being perpendicular to each other helps to eliminate the unbalanced magnetic flux generated in the iron core due to the asymmetric position of the wires, thereby ensuring the accuracy and reliability of the electromagnetic release.
[0063] like Figure 3 As shown, a schematic diagram of the structure of a circuit breaker disclosed in the present invention is shown, which includes a connecting plate 3, a current sampling device 4, a moving contact 5, and the electromagnetic release as described in the first aspect.
[0064] The connecting plate 3 is the interface part of the circuit breaker and is responsible for connecting with the external circuit. In addition, the connecting plate 3 is also electrically connected to the static contact 13. Since one end 211 of the coil in the electromagnetic release is welded to the yoke 1, and the yoke 1 and the static contact 13 are designed as one body, in some embodiments, the connecting plate 3 is welded to the other end 212 of the coil in the electromagnetic release.
[0065] like Figure 4 As shown, in some embodiments, the current sampling device 4 is installed between the connecting plate 3 and the electromagnetic release for real-time monitoring of the current flowing through the circuit breaker. The device is provided with an inner ring hole 41, allowing the connecting plate 3 to pass through for connecting external wiring.
[0066] Exemplarily, the current sampling device 4 is a current transformer.
[0067] Specifically, the current transformer adopts a high temperature resistant plastic shell, the opening is encapsulated by resin, and the outer diameter does not exceed 15mm. The current transformer converts the large current in the external circuit into a smaller current in proportion for measurement and monitoring. When the current transformer detects an abnormal current, its output signal triggers the electromagnetic release, and the electromagnetic release immediately acts to push the moving contact 5 away from the static contact 13, thereby realizing the rapid disconnection of the circuit.
[0068] The current transformer has high sampling accuracy, small footprint, simple process, easy assembly and is not prone to disconnection, making the entire circuit breaker more compact, efficient and easy to upgrade to intelligent technology.
[0069] In summary, the disclosed embodiments provide an electromagnetic release and a circuit breaker, wherein the core assembly and the yoke in the electromagnetic release are designed to be separated, and a snap-on matching mechanism is introduced, which improves production efficiency, and allows for easy replacement of the core assembly and the yoke, which also provides great convenience for rapid assembly and later maintenance. In addition, an integrated design of the static contact, yoke, and arc-starting plate is proposed. By integrating these components, the steps in the manufacturing process are reduced, thereby effectively improving production efficiency. In the design of the circuit breaker, a current transformer is used as a current sampling device, which occupies a small volume and has high precision, thereby making the entire circuit breaker more compact, efficient, and easy to upgrade to intelligence.
[0070] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present disclosure shall still be covered by the claims of the present disclosure.
Claims
1. An electromagnetic release, comprising a yoke and an iron core assembly, characterized in that: The yoke is a rectangular structure, with a coaxial circular hole on each of the left and right sides, and a square notch is opened on the circumferential side wall of one of the circular holes; The iron core assembly includes a coil, a coil frame, a moving iron core, a stationary iron core, a push rod, and a spring; wherein the coil is wound on the coil frame; a limit block adapted to the square notch of the magnetic yoke is provided on the coil frame, so that the iron core assembly is fixed in the magnetic yoke when the limit block is embedded in the square notch; the moving iron core and the stationary iron core are both arranged inside the coil frame, and the spring is installed between the moving iron core and the stationary iron core; one end of the push rod is in contact with the moving iron core, and the other end passes through the through hole of the stationary iron core and extends out of the coil frame, so as to respond to the movement of the moving iron core and trigger the tripping operation.
2. The electromagnetic release according to claim 1, characterized in that: The moving iron core is provided with a groove for accommodating part of the push rod; the spring is sleeved on the push rod, one end of the spring is placed in the groove, and the other end is in contact with the stationary iron core.
3. The electromagnetic release according to claim 1, characterized in that: The circular hole on one side of the magnetic yoke extends downward to form a static contact. An arc-starting plate is arranged under the magnetic yoke, and the arc-starting plate is designed as an integral whole with the static contact.
4. The electromagnetic release according to claim 3, characterized in that: The coil is composed of a copper solenoid, with two ends respectively led out, and the led-out ends are perpendicular to each other; one end is fixedly connected to the magnetic yoke by welding.
5. The electromagnetic release according to claim 1, characterized in that: The moving iron core is installed in the coil frame by a clearance fit, and is used for vertical displacement under the action of a magnetic field; the static iron core is fixed in the coil frame by an interference fit.
6. The electromagnetic release according to claim 1, characterized in that: The ejector rod passes through the through hole of the static iron core through clearance fit, and is used to respond to the movement of the moving iron core and trigger a tripping operation.
7. A circuit breaker, comprising a connecting plate, a current sampling device, and a moving contact, the electromagnetic release according to any one of claims 1 to 6, characterized in that: The current sampling device is installed between the connecting plate and the electromagnetic release, and is provided with an inner ring hole for the connecting plate to pass through for external wiring; when the current sampling device detects an abnormal external current, the electromagnetic release is triggered to operate and push the moving contact to disengage.
8. The circuit breaker according to claim 7, characterized in that: The current sampling device is a current transformer.
9. The circuit breaker according to claim 8, characterized in that The inner ring aperture of the current transformer is ≤15 mm.
10. The circuit breaker according to claim 7, characterized in that: The connecting plate is electrically connected to one end of the coil in the electromagnetic release by welding.