CN112053902B

CN112053902B - Spring operating mechanism and vacuum circuit breaker

Info

Publication number: CN112053902B
Application number: CN202010952445.5A
Authority: CN
Inventors: 王星; 李林; 王闯; 宾啸; 黄玉忠; 肖洋; 何振翔; 陈鸿光; 李涵; 周焜煜
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2023-07-07
Anticipated expiration: 2040-09-11
Also published as: CN112053902A

Abstract

The application relates to a spring operating mechanism and vacuum circuit breaker, the spring operating mechanism includes: the spring operation body, the electromagnet assembly, the insulating layer and the wiring terminal. The insulating layer cladding is in coil surface, and the iron core runs through the both ends of coil and insulating layer, and when the external power supply of binding post was circular telegram for the coil, the coil produced the electromagnetic field, and the iron core is by actuation, striking spring operation body, and when the coil outage, the iron core release is separated with spring operation body, moves in order to accomplish the divide-shut brake of vacuum circuit breaker through the spring operation body. The insulating layer isolates the coil from the external environment, prevents the coil from being in direct contact with the external environment to accelerate the aging rate of the coil, prevents the insulation property of the coil from being reduced, and simultaneously prevents the coil from being damped or damaged by external force, thereby greatly prolonging the service life of the spring operating mechanism and improving the working stability of the spring operating mechanism.

Description

Spring operating mechanism and vacuum circuit breaker

Technical Field

The application relates to the technical field of electrical equipment, in particular to a spring operating mechanism and a vacuum circuit breaker.

Background

The vacuum circuit breaker is used as a novel switch, has the advantages of simple structure, safe and reliable operation, long service life, frequent operation and the like, and therefore, compared with the traditional low-oil circuit breaker, magnetic blow-out circuit breaker and the like, the vacuum circuit breaker has higher market share. The spring operating mechanism adopted by most vacuum circuit breakers in China is generally of a CT19 type, and the CT19 type vacuum circuit breaker has the highest fault rate due to longer operation life, and particularly in the aspect of opening and closing coils, the switching faults caused by short circuit and the like of the opening and closing coils almost all occur on the CT-19 type switching mechanism. The production process of the opening and closing coil is simple, the coil is wound by an enamelled wire, the opening and closing coil is exposed in the air in the long-term operation process, the defects of turn-to-turn insulation reduction, coil deformation and the like are easily caused, once the turn-to-turn insulation of the opening and closing coil is reduced, the vacuum circuit breaker is refused to operate, the override trip is caused, and great hidden danger is brought to the safe and stable operation of a power grid. Therefore, the operation stability of the spring operating mechanism in the current vacuum circuit breaker is poor.

Disclosure of Invention

Based on this, it is necessary to provide a spring operating mechanism and a vacuum circuit breaker, which solve the problem of poor operation stability of the spring operating mechanism in the current vacuum circuit breaker.

A spring operated mechanism comprising:

a spring operating body;

an electromagnet assembly comprising:

the iron core is opposite to the spring operation body;

the coil is wound on the outer surface of the iron core, when the coil is electrified, the iron core is attracted and impacted to the spring operation body, and when the coil is deenergized, the iron core is released and separated from the spring operation body;

the insulation layer is coated on the outer surface of the coil, and two ends of the iron core penetrate through the insulation layer;

and the wiring terminal is arranged on one side of the insulating layer, which is far away from the coil, and is electrically connected with the coil.

In one embodiment, a vacuum is provided between the insulating layer and the coil.

In one embodiment, the insulating layer is made of a flexible material.

In one embodiment, the flexible material is an unsaturated polyester glass fiber.

In one embodiment, the flexible material comprises chopped glass fibers and an unsaturated resin.

In one embodiment, the method further comprises:

the box body is provided with a containing cavity, and the spring operation body and the electromagnet assembly are arranged in the box body.

In one embodiment, the method further comprises:

the fixed plate is arranged on the inner wall of the box body, and the electromagnet assembly is detachably arranged on the fixed plate.

In one embodiment, the fixing plate includes:

the electromagnet assembly is detachably arranged on the plate body;

the plurality of side edges are respectively arranged on the side edges of the plate body and are detachably connected with the inner wall of the box body.

In one embodiment, the spring operated body comprises:

the transmission mechanism is opposite to the iron core;

the pawl component is movably connected with the transmission structure.

A vacuum circuit breaker comprising a spring operated mechanism as described above.

The spring operating mechanism provided in the embodiment of the application includes: the spring operation body, the electromagnet assembly, the insulating layer and the wiring terminal. The insulating layer cladding in the coil surface, the iron core run through the coil with the both ends of insulating layer, when passing through binding post external power source for the coil circular telegram, the coil produces the electromagnetic field, the iron core is by the actuation, striking the spring operation body, when the coil outage, the iron core release, with the separation of spring operation body is through the action of spring operation body is in order to accomplish the divide-shut brake of vacuum circuit breaker. The insulation layer isolates the coil from the external environment, prevents the coil from being in direct contact with the external environment to accelerate the aging rate of the coil, and also prevents the coil from being reduced in insulation property, and meanwhile, the insulation layer can also prevent the coil from being damped or damaged by external force, so that the service life of the spring operating mechanism is greatly prolonged, and the working stability of the spring operating mechanism is improved.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a spring actuator according to one embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a spring actuator according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a part of a spring actuator according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an installation structure of an electromagnet assembly of a spring operated mechanism according to one embodiment of the present disclosure;

FIG. 5 is a schematic view of a spring actuator mounting plate according to one embodiment of the present disclosure;

FIG. 6 is a schematic view of a spring operating body of a spring operating mechanism according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a vacuum circuit breaker according to an embodiment of the present application.

Reference numerals:

10. a spring operating mechanism;

100. a spring operating body;

110. a transmission mechanism;

120. a latch assembly;

200. an electromagnet assembly;

210. an iron core;

220. a coil;

300. an insulating layer;

400. a connection terminal;

500. a case;

510. a receiving cavity;

600. a fixing plate;

610. a plate body;

620. a side edge;

20. a vacuum circuit breaker.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the following embodiments are used to further describe the spring operating mechanism and the vacuum circuit breaker of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Referring to fig. 1, an embodiment of the present application provides a spring operating mechanism 10, which can be applied to operate vacuum circuit breakers 20 in various handcart type switch cabinets and other types of circuit breakers with closing work equivalent to that of the vacuum circuit breakers 20. The spring operating mechanism 10 generally includes an energy storage mechanism unit, a driving unit, a release unit and an electrical control unit, and may perform functions of electric energy storage, electric opening and closing, where the energy storage unit includes an electromagnet assembly 200 and a spring operating body 100, and the electromagnet assembly 200 and the spring operating body 100 work together with other assemblies to complete the opening and closing actions. The basic operation of the vacuum interrupter 20 can be described simply as: energy storage, closing preparation, closing holding (locking), closing action completion, opening, tripping, opening action completion and the like. The present embodiment will be specifically described by taking the application of the spring operating mechanism 10 to the vacuum interrupter 20 as an example.

One embodiment of the present application provides a spring operated mechanism 10 comprising: the spring operator body 100, the electromagnet assembly 200, the insulating layer 300, and the connection terminal 400.

The spring operating body 100 interacts with the electromagnet assembly 200 to convert the attraction force of the electromagnet assembly 200 into mechanical force, thereby completing the opening and closing actions. The spring operation body 100 may be made of any metal material for the attraction connection with the electromagnet assembly 200, and the spring operation body 100 may be made of other non-metal materials, but it should be noted that the position of the spring operation body 100 opposite to the electromagnet assembly 200 must be made of a metal material to achieve the attraction connection between the spring operation body 100 and the electromagnet assembly 200. The spring operation body 100 may be in a rod shape, an arc shape, or any other shape, etc., and the embodiment does not limit the spring operation body 100, and may be specifically selected according to practical situations, so long as the function of being able to be attracted to the electromagnet assembly 200 and capable of converting the attraction force of the electromagnet assembly 200 into mechanical energy is satisfied.

The electromagnet assembly 200 is configured to generate a magnetic field to drive the spring operation body 100 to move, the electromagnet assembly 200 may be a switching-off electromagnet or a switching-on electromagnet, and when the electromagnet assembly is energized, the electromagnet assembly moves to strike the spring operation body 100 to move the spring operation body 100, so that the input electric energy is used as mechanical energy to generate driving force through electromagnetic energy, and thus the electromagnet assembly is matched with other components to complete switching-on and switching-off of the vacuum circuit breaker 20. Each electromagnet includes: iron core 210 and coil 220.

The iron core 210 is opposite to the spring operation body 100, and is connected to the spring operation body 100 in a suction manner. The engaging connection means that the iron core 210 is opposite to the spring operation body 100 in position and is attached to each other, when the coil 220 is energized, the iron core 210 engages and impacts the spring operation body 100, and when the coil 220 is deenergized, the iron core 210 is released and separated from the spring operation body 100. The core 210 is made of a metal magnetically permeable material. It should be noted that the surface of the iron core 210 is smooth, so as to prevent the iron core 210 from jamming, slow or even incapable of moving. The material, shape, etc. of the iron core 210 are not limited in this embodiment, and may be specifically selected according to practical situations.

The coil 220 is wound on the outer surface of the iron core 210, when the coil 220 is electrified, an electromagnetic field is generated around the coil 200, the iron core 210 is attracted under the electromagnetic action, and impacts the spring operation body 100, when the coil 220 is deenergized, the electromagnetic field disappears, the iron core 210 is released and separated from the spring operation body 100, and the iron core 210, the coil 220, the spring operation body 100 and other components cooperate and interact with each other, so that the vacuum circuit breaker 20 completes the opening and closing actions. The coil 220 may be a copper core coil, and is wound instead of an enameled wire in a conventional scheme, so that the failure rate is low. The material, the number of turns, the distance between turns, etc. of the coil 220 are not limited in this embodiment, and may be specifically selected or set according to practical situations.

The insulation layer 300 is coated on the outer surface of the coil 220, two ends of the iron core 210 penetrate through the insulation layer 300, and the insulation layer 300 is used for protecting the coil 220 and isolating the coil 220 from the external environment, so that the coil 220 is prevented from being corroded, rusted and the like due to the influence of the external environment. The insulating layer 300 may be attached to the surface of the coil 220, or may be spaced from the coil 220. However, it should be noted that the insulating layer 300 is a fully-closed structure, and the coil 220 is completely sealed in the inner cavity of the insulating layer 300, so as to prevent the coil 220 from directly contacting with the external environment to accelerate the aging rate of the coil 220, thus preventing the insulation of the coil 220 from being reduced, and the insulating layer 300 can prevent the coil 200 from being damped or damaged by external force, thereby greatly prolonging the service life of the spring operating mechanism 10 and improving the working stability of the spring operating mechanism 10. The insulating layer 300 may be made of a hard material, such as hard plastic, aluminum, etc., and is formed as a protective case, and two sides of the metal case are respectively provided with a through hole, so as to provide a movable space for the iron core 210, and the iron core 210 penetrates through the two through holes. The insulating layer 300 may also be made of a flexible material, such as rubber, and directly attached to the outer surface of the coil 220, so as to block the coil 220 from directly contacting with the external environment, thereby prolonging the service life of the spring operating mechanism 10 and improving the working stability of the spring operating mechanism 10.

The connection terminal 400 is disposed on a side of the insulating layer 300 away from the coil 220, and is electrically connected to the coil 220. The number of the connection terminals 400 may be two, the connection terminals 400 are used to provide power connection ports for the coils 220, and the two connection terminals 400 are respectively connected with the positive pole and the negative pole of the external power supply. The coil 220 is covered in the insulating layer 300, isolated from the outside, and the two connection terminals 400 are electrically connected to two ends of the coil 220, respectively, to energize the coil 220. The material of the connection terminal 400 may be any metal material, such as gold, silver, copper, etc., and the number, type, material, etc. of the connection terminal 400 are not limited in this embodiment, and may be specifically selected according to practical situations, and only needs to satisfy the function of providing a power connection port for the coil 220.

The working principle of the spring operating mechanism 10 provided in the embodiment of the present application is as follows:

the spring operating mechanism 10 provided in the embodiment of the present application includes: the spring-operated body 100, the electromagnet assembly 200, the insulating layer 300, and the connection terminal 400. The insulating layer 300 is coated on the surface of the coil 220, the iron core 210 penetrates through both ends of the coil 220 and the insulating layer 300, when the coil 220 is electrified by an external power supply of the connecting terminal 400, the iron core 210 is attracted to the spring operating body 100, and when the power is off, the iron core 210 releases the spring operating body 100 to complete the opening and closing of the vacuum circuit breaker. The insulating layer 300 isolates the coil 220 from the external environment, thereby preventing oxides, moisture, etc. in the external environment from undergoing oxidation-reduction reaction or electrochemical reaction with the coil 220, and protecting the coil 220 from the external environment, thereby protecting the coil 220.

The embodiment of the present application provides a spring operating mechanism 10, including the spring operating body 100 and the electromagnet assembly 200, the electromagnet assembly 200 includes an iron core 210 and a coil 220, and a layer of insulating layer 300 is coated outside the coil 220, so that the coil 220 is completely coated in the insulating layer 300 and isolated from air. The spring operating mechanism 10 provided in this embodiment of the present application avoids the coil 220 being directly exposed to the air, and prevents the coil 220 from undergoing oxidation-reduction reaction with oxides, moisture, etc. in the air, so as to reduce the insulation between turns of the coil 220, thereby greatly improving the working stability of the spring operating mechanism 10. At the same time, the insulating layer 300 is effectively moisture-proof and prevents the coil 220 from being deformed by external impact, etc. The insulating layer 300 is provided to solve the technical problem of poor working stability of the spring operating mechanism 10 in the vacuum circuit breaker 20 in the prior art, and achieve the technical effect of improving the working stability of the spring operating mechanism 10 in the vacuum circuit breaker 20.

In one embodiment, the gaps between the insulating layer 300 and the coils 220 and the iron core 210 are all in a vacuum state, and the air in the inner cavity of the insulating layer 300 can be pumped out by a vacuum pumping device, such as a needle tube, so as to provide a vacuum environment for the inside of the insulating layer 300, that is, the coils 220. Since the vacuum environment does not contain any moisture, oxygen, or other oxides, the coil 220 does not undergo oxidation-reduction reaction, and once the coil 220 is corroded due to the oxidation-reduction reaction, the insulation of the coil 220 is lowered, which seriously threatens the operation safety of the vacuum interrupter 20. In this embodiment, the gaps between the insulating layer 300 and the coil 220 and between the insulating layer 300 and the iron core 210 are all in a vacuum state, so that the coil 220 is in a vacuum environment, and the oxidation rate, aging rate and corrosion efficiency of the coil 220 can be greatly delayed, so that the service life of the coil 220 is greatly prolonged and the working stability of the coil 200 is improved.

In one embodiment, the insulating layer 300 is made of a flexible material, such as rubber, etc., and the flexible material may be unsaturated polyester glass fiber (DMC), and the unsaturated polyester glass fiber may include chopped Glass Fiber (GF), unsaturated resin (UP), filler (MD), various additives, etc., and the chopped glass fiber, the unsaturated resin, the filler, and the various additives are sufficiently mixed to form a dough-like prepreg, and then reinforcement molding is performed to form the insulating layer 300. The unsaturated polyester glass fiber has excellent electrical property, mechanical property, heat resistance and chemical corrosion resistance.

In one embodiment, the electromagnet assembly 200 may be made by a method of making the electromagnet assembly 200 comprising the steps of:

fully mixing chopped glass fibers, unsaturated resin, filler and various additives to prepare a prepreg;

placing the iron core 210 wound with the coil 220 into a mold;

injecting the prepreg into a mold;

vacuumizing the inner cavity of the die;

curing the prepreg;

and demolding to obtain the electromagnet assembly 200.

The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in the figures may include steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages in other steps.

Referring to fig. 2 and fig. 3, in one embodiment, the spring operation mechanism 10 further includes: a case 500 and a fixing plate 600.

The case 500 has a receiving cavity 510, and the spring operating body 100 and the electromagnet assembly 200 are disposed in the case 500. The housing 500 may be a casing of the switch mechanism, and the accommodating cavity 510 of the housing 500 provides an installation space for the spring operating body 100 and the electromagnet assembly 200. The case 500 may have any shape, such as square, rectangular, etc., and the case 500 is made of any hard material, such as pure metal, alloy, or hard polymer material. The present embodiment is not specifically limited to the case 500, and may be specifically selected or set according to practical situations.

Referring to fig. 4, the fixing plate 600 is disposed on the inner wall of the case 500, and the electromagnet assembly 200 is detachably mounted on the fixing plate 600. The fixing plate 600 may be detachably connected to the case 500, for example, the inner wall of the case 500 and the fixing plate 600 are provided with a plurality of through holes or grooves, and the fixing plate 600 is detachably fixed to the inner wall of the case 500 by using a connecting member such as a bolt, a nut, or the like. The fixing plate 600 may be made of any hard material, such as metal, hard plastic, etc., and the specific shape, type, material, etc. of the fixing plate 600 are not limited in this embodiment, and may be specifically selected or set according to practical situations.

Referring to fig. 5, in one embodiment, the fixing plate 600 includes: a plate 610 and sides 620.

The plate 610 may be a planar plate, and the electromagnet assembly 200 may be detachably mounted on the plate 610. The plate 610 may be made of any hard material, such as metal, rigid plastic, etc., for providing mounting support for the electromagnet assembly 200. The specific shape, material, etc. of the plate 610 are not limited in this embodiment, and may be specifically selected or set according to practical situations, so long as the function of providing support for the electromagnet assembly 200 is satisfied.

The number of the side edges 620 is plural, and the plurality of side edges 620 are respectively disposed on the side surfaces of the plate body 610, may be perpendicular to the plane where the plate body 610 is located, and may be parallel to the inner wall of the box 500. The plurality of side edges 620 are detachably connected to the inner wall of the case 500, the side edges 620 are used for fixing the plate 610 to the inner wall of the case 500, and the side edges 620 may be made of any hard material, such as metal, hard plastic, etc. The side 620 may have any planar structure, such as trapezoid, rectangle, triangle, etc., to facilitate fitting with the inner wall of the case 500. The specific material, shape, etc. of the side 620 are not limited in this embodiment, and may be specifically selected or set according to practical situations.

Referring to fig. 6, in one embodiment, the spring operation body 100 includes: a transmission 110 and a latch assembly 120.

The transmission mechanism 110 is opposite to the iron core 210, and is in attraction connection with the iron core 210, the transmission mechanism 110 refers to a mechanical component in the mechanical force transmission process, and provides driving force for other mechanical structures through attraction and disconnection between the transmission mechanism 110 and the iron core 210, that is, the transmission mechanism 110 interacts with the electromagnet assembly 200 to convert electromagnetic attraction force of the electromagnet assembly 200 into mechanical force, so as to push other components of the spring operating mechanism 10, such as a driving unit, an energy storage mechanism unit and the like, to jointly complete the closing and opening of the vacuum circuit breaker 10. The transmission mechanism 110 may be made of any metal material for the actuation connection with the electromagnet assembly 200, and the transmission mechanism 110 may be made of other non-metal materials, but it should be noted that the position of the transmission mechanism 110 opposite to the electromagnet assembly 200 must be made of a metal material to achieve the actuation connection between the spring-operated body 100 and the electromagnet assembly 200. The transmission mechanism 110 may be in a rod shape, an arc shape, or any other shape, and the embodiment does not limit the transmission mechanism 110, and may be specifically selected according to practical situations, so long as the function of being able to engage with the electromagnet assembly 200 and converting the engaging force of the electromagnet assembly 200 into mechanical energy is satisfied.

The latch assembly 120 is movably connected with the transmission structure, and the latch assembly 120 may be a closing latch or a separating latch. For example, when the switch is closed, the opening latch may be used to limit the main transmission shaft in the vacuum circuit breaker 20, so that the whole operating mechanism is kept at the closing position, and when the switch is required to be opened, the transmission mechanism 110 drives the opening latch to rotate and trip to unlock the main transmission shaft, and then the vacuum circuit breaker 20 can execute the switch-off action.

Referring to fig. 7, one embodiment of the present application provides a vacuum interrupter 20 including a spring operated mechanism 10 as described above.

The spring operation mechanism 10 is described in detail in the above embodiments, and will not be described herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A spring operated mechanism, comprising:

a spring operating body;

an electromagnet assembly comprising:

the iron core is opposite to the spring operation body;

the insulation layer is coated on the outer surface of the coil, two ends of the iron core penetrate through the insulation layer, the insulation layer is of a fully-closed structure, and the coil is completely sealed in an inner cavity of the insulation layer;

the wiring terminal is arranged on one side of the insulating layer, which is far away from the coil, and is electrically connected with the coil; wherein, the vacuum state is between the insulating layer and the coil;

the insulating layer is made of a flexible material;

the flexible material is unsaturated polyester glass fiber;

the flexible material comprises chopped glass fibers and an unsaturated resin;

and fully mixing the chopped glass fibers and the unsaturated resin to form a material-ball-shaped prepreg, and reinforcing and forming to form the insulating layer.

2. The spring operated mechanism of claim 1, further comprising:

3. The spring operated mechanism of claim 2, further comprising:

4. A spring operated mechanism according to claim 3, wherein said fixed plate comprises:

the electromagnet assembly is detachably arranged on the plate body;

5. The spring operated mechanism of claim 1, wherein the spring operated body comprises:

the transmission mechanism is opposite to the iron core;

the pawl component is movably connected with the transmission structure.

6. A vacuum circuit breaker comprising a spring operated mechanism as claimed in any one of claims 1 to 5.