CN112927981B - Separating brake electromagnet of spring operating mechanism - Google Patents
Separating brake electromagnet of spring operating mechanism Download PDFInfo
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- CN112927981B CN112927981B CN202110020029.6A CN202110020029A CN112927981B CN 112927981 B CN112927981 B CN 112927981B CN 202110020029 A CN202110020029 A CN 202110020029A CN 112927981 B CN112927981 B CN 112927981B
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- iron core
- movable iron
- delay
- electromagnet
- coil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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- Electromagnets (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a brake-separating electromagnet of a spring operating mechanism. The brake separating electromagnet of the spring operating mechanism comprises: an electromagnet main body, wherein a coil is arranged inside the electromagnet main body; the movable iron core is arranged in the coil in a penetrating way; the reset spring is used for driving the movable iron core to retreat so as to reset the movable iron core; the delay counterweight is fixed on the rear end face of the movable iron core and is used for increasing the moving mass of the movable iron core so as to reduce the action speed of the movable iron core; the delay counterweight is provided with a spring stop surface which is flush with the end face of the rear end of the movable iron core and is used for supporting the end part of the reset spring. The scheme can easily control the opening time of the operating mechanism.
Description
Technical Field
The invention relates to a brake-separating electromagnet of a spring operating mechanism.
Background
According to the requirements of GB1984-2014, for an arc extinguishing chamber with a rated short-circuit breaking current, the direct current component of which is 50 percent, and current with a frequency of 50Hz, the breaking time of a vacuum circuit breaker is generally ensured to be more than 20ms, and arc re-burning caused by peak breaking at the current amplitude is avoided. If the opening time is too short, the breaker is prone to breakdown when full capacity current is opened. When the existing breaker operates the opening brake at high voltage, the spring operating mechanism triggers the opening brake action by means of the opening brake electromagnet. The brake separating electromagnet comprises an electromagnet main body, a coil is arranged in the electromagnet main body, a movable iron core is arranged in the coil in a penetrating manner and is used for extending forwards under the drive of the coil to strike a brake separating buckle plate of the operating mechanism; the brake separating electromagnet further comprises a reset spring for driving the movable iron core to retreat so as to reset the movable iron core.
The existing spring operating mechanism controlled by an electromagnet has the common breaking time of 18-20 ms, and has hidden danger for normal breaking of the vacuum circuit breaker. At present, the adjustment of the opening time of the spring operating mechanism mainly comprises the following three modes: firstly, the transmission of a brake separating module of a spring operating mechanism is adjusted, secondly, the buckling amount between a brake separating electromagnet and a brake separating buckle plate is adjusted, and thirdly, the parameters of the electromagnet are adjusted.
However, the first mode is difficult to design and requires life test verification; the second approach may result in low voltage trip instability; the third approach requires a solution to be discussed with the electromagnet manufacturer and verified multiple times.
Disclosure of Invention
The invention aims to provide a brake separating electromagnet of a spring operating mechanism, which can easily control brake separating time of the operating mechanism.
The brake separating electromagnet of the spring operating mechanism adopts the following technical scheme:
the opening electromagnet of the spring operating mechanism comprises:
an electromagnet main body, wherein a coil is arranged inside the electromagnet main body;
the movable iron core is penetrated in the coil and used for extending forwards under the drive of the coil to strike the brake separating buckle plate of the operating mechanism;
the reset spring is used for driving the movable iron core to retreat so as to reset the movable iron core;
further comprises:
the delay counterweight is fixed on the rear end face of the movable iron core and is used for increasing the moving mass of the movable iron core so as to reduce the action speed of the movable iron core;
the delay counterweight is provided with a spring stop surface which is flush with the end face of the rear end of the movable iron core and is used for supporting the end part of the reset spring.
The beneficial effects are that: by adopting the technical scheme, the motion speed of the movable iron core can be reduced by increasing the motion quality of the movable iron core, so that the motion time is prolonged, meanwhile, the spring stop surface on the delay counter weight is flush with the end face of the rear end of the movable iron core, the end part of the reset spring of the split electromagnet can be supported, the working length of the reset spring is ensured, and the working length is the same as that before the delay counter weight is increased, so that the control of the split time of the operating mechanism is easily realized.
As a preferred technical scheme:
a sinking groove is formed in the delay counterweight, and the bottom wall of the sinking groove is fixedly connected with the end face of the rear end of the movable iron core;
the inner diameter of the sinking groove is larger than the outer diameter of the reset spring, the rear end of the reset spring is embedded into the sinking groove, and the spring stopping surface is formed by the groove bottom wall of the sinking groove.
The beneficial effects are that: by adopting the technical scheme, the axial space occupation of the movable iron core can be avoided from being excessively increased after the delay counterweight is added, and the problem of insufficient space at the position of the brake-separating electromagnet in the spring operating mechanism is avoided.
As a preferred technical scheme:
the delay counterweight is provided with a screw through hole and is fixed on the rear end face of the movable iron core through a screw.
The beneficial effects are that: by adopting the technical scheme, the disassembly and assembly are convenient, and the delay counterweight with proper weight is convenient to select.
As a preferred technical scheme:
and a counter weight is arranged on one side of the delay counter weight, which is opposite to the movable iron core, and is provided with a counter bore for sinking the head of the screw.
The beneficial effects are that: by adopting the technical scheme, the axial space occupied by the delay counterweight can be further reduced.
Drawings
FIG. 1 is a schematic view of the structure of embodiment 1 of a brake-off electromagnet of a spring actuator in the present invention in a brake-off state;
fig. 2 is a schematic structural diagram of the opening electromagnet in fig. 1 in a closed state;
FIG. 3 is a schematic view of the construction of the delay weight of FIG. 1;
the names of the corresponding components in the figures are: 11. an electromagnet body; 12. a coil; 21. a movable iron core; 22. a bump; 31. a reset spring; 41. delay counterweight; 42. sinking grooves; 43. a countersunk hole; 44. punching a screw; 51. and (5) a screw.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises a depicted element.
In the description of the present invention, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
In the description of the present invention, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
The present invention is described in further detail below with reference to examples.
In the embodiment 1 of the opening electromagnet of the spring operating mechanism:
as shown in fig. 1 and 2, the brake separating electromagnet of the spring operating mechanism is a brake separating electromagnet used by the spring operating mechanism in the vacuum circuit breaker, and comprises an electromagnet main body 11, a movable iron core 21, a reset spring 31 and a delay counterweight 41, and is formed by modifying the existing brake separating electromagnet, wherein the concrete modification content is that a spring seat at the rear end of the original movable iron core 21 is detached, and the delay counterweight 41 is replaced.
The electromagnet body 11 may have a structure of the prior art, in which a coil 12 is provided, and a movable iron core 21 is provided in the coil 12. The front end of the movable iron core 21 penetrates out of the electromagnet main body 11, a collision block 22 is fixed on the penetrating part and is used for extending forwards under the drive of the coil 12 to strike a brake separating buckle plate of the operating mechanism, so that brake separating action of the operating mechanism is realized, and the arc extinguishing chamber is driven to complete brake separating of the circuit breaker.
As shown in fig. 3, the delay weight 41 has a disc-shaped structure, a countersunk groove 42 is formed on the front side surface, a countersunk hole 43 is formed on the rear side surface, the countersunk groove 42 is used for inserting the rear end of the movable iron core 21, and the countersunk hole 43 is used for sinking the head of the screw 51. The center of the sinking groove 42 is provided with a screw through hole 44 for fixing the delay weight 41 on the rear end surface of the movable iron core 21 through a screw 51. The reset spring 31 is a circuit breaker of the existing brake separating electromagnet, in order to ensure that the working length of the reset spring 31 is the same as that before the delay weight 41 is added, the inner diameter of the sinking groove 42 is larger than the outer diameter of the reset spring 31, the bottom wall of the sinking groove 42 is flush with the end face of the rear end of the movable iron core 21, and the end part of the reset spring 31 is supported by the reset spring 31 to form a spring stopping surface to replace a spring seat of the existing brake separating electromagnet.
When the patent brake-separating electromagnet is used, firstly, the electromagnetic force required by the brake-separating electromagnet to strike a brake-separating pinch plate is determined, the brake-separating time is tested on the basis of the electromagnetic force, the brake-separating time is controlled by a delay counterweight 41 with corresponding mass, and the electromagnetic force is properly increased by changing the number of turns of a coil 12, so that the brake-separating time of a circuit breaker is prolonged to be more than 20ms under the condition of ensuring low-voltage stable brake-separating, for example, 3-5ms time. In addition, the spring stop surface is flush with the end face of the rear end of the movable iron core 21, the working length of the original reset spring 31 is not influenced, the whole length of the switching-off electromagnet is not obviously increased, interference with a panel is avoided, the movement space of the reset spring 31 is reserved, the stroke of the switching-off electromagnet is ensured, and the delay block can be ensured to have enough quality due to the sinking groove 42 arranged on the delay counterweight 41. Simultaneously, the structure can conveniently reform transform the brake separating electromagnet that brake separating performance demand is different. The electromagnetic force is properly increased by changing the number of turns of the coil 12, so that the brake-separating electromagnet is beneficial to meeting the most basic brake-separating requirement. Although the magnetic force is increased to facilitate the opening, the excessive electromagnetic force can cause 30% of the opening rated voltage to fail and the opening time is too short, which is unfavorable for the extinction of the electric arc, so that the increase of the number of turns of the coil and the cooperation of the delay counterweight 41 can more easily meet the action requirement of the opening electromagnet, thereby ensuring the opening time and normal opening action.
In the embodiment 2 of the opening electromagnet of the spring operating mechanism:
the present embodiment is different from embodiment 1 in that in embodiment 1, the delay weight 41 is fixed to the rear end face of the movable core 21 by a screw 51, whereas in the present embodiment, the delay weight 41 is fixed to the rear end face of the movable core 21 by caulking. In other embodiments, the weight of the delay weight 41 may be determined and then welded to the rear end surface of the plunger 21.
Embodiment 3 of the opening electromagnet of the spring operating mechanism in the invention:
the difference between this embodiment and embodiment 1 is that in embodiment 1, the delay weight 41 has a disc structure, and in this embodiment, the delay weight includes a base plate, a front side surface of the base plate forms a spring stop surface, and bumps are uniformly distributed on the front side surface of the base plate along the circumferential direction. Of course, in other embodiments, the delay weight 41 may be a plate-like structure, and the radial dimension of the delay weight may be increased in order to ensure that the delay weight 41 has a set weight.
The above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and the patent protection scope of the present application is defined by the claims, and all equivalent structural changes made by the specification and the attached drawings of the present application should be included in the protection scope of the present application.
Claims (4)
1. The opening electromagnet of the spring operating mechanism comprises:
an electromagnet main body (11) provided with a coil (12) inside;
the movable iron core (21) is arranged in the coil (12) in a penetrating way and is used for extending forwards under the drive of the coil (12) to strike the brake separating buckle plate of the operating mechanism;
the reset spring (31) is used for driving the movable iron core (21) to retreat so as to reset the movable iron core (21);
characterized by further comprising:
a delay counterweight (41) fixed on the rear end surface of the movable iron core (21) for increasing the moving mass of the movable iron core (21) to reduce the moving speed of the movable iron core (21);
a spring stop surface is arranged on the delay counterweight (41), and is level with the end surface of the rear end of the movable iron core (21) for supporting the end part of the reset spring (31);
the number of turns of the coil (12) satisfies: based on the increase of the moving mass of the movable iron core (21) caused by the arrangement of the delay counter weight (41), the number of turns of the coil (12) is increased to increase the electromagnetic force, so that normal opening action is ensured and the opening time is controlled through the cooperation of the number of turns of the coil (12) and the delay counter weight (41).
2. The brake-off electromagnet according to claim 1, wherein,
a sinking groove (42) is formed in the delay counterweight (41), and the bottom wall of the sinking groove (42) is fixedly connected with the end face of the rear end of the movable iron core (21);
the inner diameter of the sinking groove (42) is larger than the outer diameter of the reset spring (31), the rear end of the reset spring (31) is embedded into the sinking groove (42), and the spring blocking surface is formed by the groove bottom wall of the sinking groove (42).
3. The switching-off electromagnet according to claim 1 or 2, wherein,
the time delay counterweight (41) is provided with a screw perforation (44), and the time delay counterweight (41) is fixed on the rear end surface of the movable iron core (21) through a screw (51).
4. The brake-separating electromagnet according to claim 3, wherein,
a counter weight (41) is provided with a counter bore (43) on one side facing away from the movable iron core (21) for sinking the head of the screw (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110020029.6A CN112927981B (en) | 2021-01-07 | 2021-01-07 | Separating brake electromagnet of spring operating mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110020029.6A CN112927981B (en) | 2021-01-07 | 2021-01-07 | Separating brake electromagnet of spring operating mechanism |
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| Publication Number | Publication Date |
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| CN112927981A CN112927981A (en) | 2021-06-08 |
| CN112927981B true CN112927981B (en) | 2023-08-08 |
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