CN113889380A - Small-size direct current quick circuit breaker - Google Patents

Small-size direct current quick circuit breaker Download PDF

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Publication number
CN113889380A
CN113889380A CN202111042208.6A CN202111042208A CN113889380A CN 113889380 A CN113889380 A CN 113889380A CN 202111042208 A CN202111042208 A CN 202111042208A CN 113889380 A CN113889380 A CN 113889380A
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CN
China
Prior art keywords
arc
arc extinguishing
magnetic conduction
iron core
circuit breaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111042208.6A
Other languages
Chinese (zh)
Inventor
江阳
杨树松
黄依婷
马彦波
盛锦江
俞益
涂勇
朱纪法
张洪松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Derrida Electric Co ltd
Original Assignee
Hangzhou Derrida Electric Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Derrida Electric Co ltd filed Critical Hangzhou Derrida Electric Co ltd
Priority to CN202111042208.6A priority Critical patent/CN113889380A/en
Publication of CN113889380A publication Critical patent/CN113889380A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/38—Electromagnetic mechanisms wherein the magnet coil also acts as arc blow-out device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

The invention discloses a small direct current quick breaker, which comprises a switch body and an arc extinguishing chamber arranged above the switch body, wherein a main conducting bar, a contact system, a switching-on/off operating mechanism, an electromagnetic operating mechanism and a magnetic blowing mechanism are arranged in the switch body; the small direct current quick circuit breaker provided by the invention has the advantages of magnetic blow-out mechanism, quick arc extinguishing capability, stable over-current tripping protection device and capability of meeting the installation requirement of a small space.

Description

Small-size direct current quick circuit breaker
Technical Field
The invention relates to the field of small direct current quick breakers. More particularly, the present invention relates to a small-sized direct current fast circuit breaker capable of realizing fast arc extinguishing.
Background
Arc extinguishing operation is indispensable in the circuit breaker, and the arc extinguishing lets electric arc and solid medium contact, reduces electric arc temperature to the arc extinguishes with higher speed, but ubiquitous electric arc extinguishes the problem with low efficiency, that is slow in present circuit breaker.
Disclosure of Invention
To achieve these objects and other advantages in accordance with the present invention, there is provided a small dc fast circuit breaker including a switch body and an arc extinguishing chamber installed above the switch body, the switch body being provided therein with a main conductive bar, a contact system, an overcurrent trip mechanism, an opening/closing operation mechanism, an electromagnetic operation mechanism, a magnetic blow-off mechanism, and a secondary circuit auxiliary contact.
According to a preferred embodiment of the present invention, the electromagnetic operating mechanism includes:
the device comprises a shell, a handle and a handle, wherein the shell is provided with a concentric circular truncated cone-shaped cavity, and the side wall of the shell is hollow;
the magnet is arranged in one larger side of the chamber and has a hollow cylindrical structure;
the movable iron core is arranged in the cavity, and the movable iron core is partially arranged in the magnet in a penetrating way; the back end of the movable iron core is sleeved with a counter-force spring; and
a coil disposed within a sidewall of the chamber;
the movable iron core comprises:
the iron core is internally provided with a front end cavity and a rear end cavity which are communicated through a partition plate arranged in the iron core; a spring and a first gasket are arranged in a front end cavity in the iron core; an adjusting washer and a butterfly spring are arranged in a rear end cavity in the iron core;
a shaft partially penetrating the spring and the first washer; and
the screw penetrates through the adjusting washer and the butterfly spring and is connected with the iron core;
wherein the iron core is arranged in the smaller side of the cavity.
According to a preferred embodiment of the invention, the smaller side of the chamber has a length greater than the length of the plunger to allow the plunger to move back and forth.
According to a preferred embodiment of the invention, the arc chute comprises:
the first arc extinguishing encloser and the second arc extinguishing encloser are symmetrically arranged, and the first arc extinguishing encloser and the second arc extinguishing encloser are communicated to form a hollow space together;
the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the first arc extinguishing cover shell and the surface of the second arc extinguishing cover shell in a surface-mounted manner; and
two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser and the second arc extinguishing encloser, and are separated by a certain distance to form an arc extinguishing channel;
each arc-extinguishing grid sheet is formed by overlapping a metal grid sheet and an insulating grid sheet, and a notch is formed in each arc-extinguishing grid sheet;
the first arc extinguishing cover shell surface and the second arc extinguishing cover shell surface are respectively provided with a first magnetic conduction block and a second magnetic conduction block, the first magnetic conduction block is connected with the first magnetic conduction plate, and the second magnetic conduction block is connected with the second magnetic conduction plate;
and an arc baffle plate is arranged at the top of the hollow space and is positioned above the arc extinguishing channel.
According to a preferred embodiment of the present invention, the arc chute pieces are disposed obliquely and at an acute angle to the first arc chute shell and the second arc chute shell along a moving direction of the current arc in the arc chute.
According to a preferred embodiment of the present invention, the magnetic blow mechanism includes a moving contact, a fixed contact, a first excitation coil, a second excitation coil, an excitation core, and a main striking bar;
the first excitation coil and the second excitation coil are arranged on the main conductive row, and both the first excitation coil and the second excitation coil are connected to the main arc striking row; the center of the first excitation coil and the center of the second excitation coil are provided with the same excitation iron core, and the first excitation coil and the second excitation coil are insulated and isolated from each other; the two ends of the excitation iron core are respectively provided with the first magnetic conduction block and the second magnetic conduction block, wherein the first magnetic conduction block is connected with the first magnetic conduction plate, and the second magnetic conduction block is connected with the second magnetic conduction plate; the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the arc extinguishing cover in a surface-mounted manner;
the moving contact is rotatably hinged on the main conductive bar, and the moving contact and the fixed contact can be switched on/off under the pushing of an external switching-on/switching-off operating mechanism;
the static contact and the main arc striking row are arranged in the arc extinguishing cover.
According to a preferred embodiment of the present invention, the fixed contact includes a fixed arc striking bar, a fixed conductive bar and a fixed contact silver point, the fixed conductive bar is connected to the arc extinguishing chamber, the fixed contact silver point is disposed on the fixed conductive bar, and the fixed arc striking bar is connected to the fixed contact silver point, wherein the fixed contact silver point and the movable contact can be connected/disconnected under the pushing of an external opening/closing operation mechanism.
According to a preferred embodiment of the present invention, the main ignition row comprises a main ignition row and a main conducting row, wherein the main ignition row is connected to the main conducting row.
According to a preferred embodiment of the present invention, the widths of the metal grid pieces are sequentially increased along the moving direction of the current arc in the arc extinguishing channel, and the widths of the upper insulation grid piece and the lower insulation grid piece corresponding to each of the metal grid pieces are also sequentially increased.
According to a preferred embodiment of the present invention, the notches on two adjacent arc chute pieces are staggered.
The invention at least comprises the following beneficial effects: the small direct current quick circuit breaker provided by the invention has the advantages of magnetic blow-out mechanism, quick arc extinguishing capability, stable over-current tripping protection device and capability of meeting the installation requirement of a small space.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic view of the overall structure of a small dc quick circuit breaker according to the present invention.
Fig. 2 is a schematic structural view of the electromagnetic operating mechanism of the present invention.
Fig. 3 is a schematic structural view of the movable iron core of the present invention.
Figure 4 is a side view of the magnetic blow mechanism and arc chute of the present invention.
Figure 5 is a front view of the magnetic blow mechanism and arc chute of the present invention.
Fig. 6 is a schematic structural view of a stationary contact according to the present invention.
Fig. 7 is a schematic structural diagram of the main arc striking row.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
As shown in fig. 1 to 7, an embodiment of the present invention provides a small-sized dc fast circuit breaker, which includes a switch body 10 and an arc extinguishing chamber 9 installed above the switch body 10, wherein the switch body 10 is internally provided with a main conducting bar 1, a contact system 2, an overcurrent tripping mechanism 3, an opening/closing operation mechanism 4, an electromagnetic operation mechanism 6, a magnetic blowing mechanism 7, and a secondary circuit auxiliary contact 8.
In one embodiment, the electromagnetic operating mechanism 6 comprises:
a housing 61 provided with a concentric circular truncated cone-shaped cavity, wherein the side wall of the housing 61 is hollow; and a shaft sleeve 66 is further arranged in the cavity and sleeved on the movable iron core 63.
A magnet 62 disposed in a larger side of the chamber, the magnet 62 having a hollow cylindrical structure;
a movable iron core 63 arranged in the cavity, wherein the movable iron core 63 is partially arranged in the magnet 62 in a penetrating way; the back end of the movable iron core 63 is sleeved with a counter force spring 64; and
a coil 65 disposed within a sidewall of the chamber;
wherein the movable iron core 63 includes:
a core 631 having a front end cavity and a rear end cavity therein, which are communicated with each other through a partition plate provided in the core; a spring 632 and a first gasket 633 are arranged in a front end cavity in the iron core; the cavity at the rear end of the iron core 631 is provided with an adjusting washer 634 and a butterfly spring 635;
a shaft 636 partially passing through the spring 632 and the first washer 633; and
a screw 637 passing through the setting washer 634 and the butterfly spring 635 and connected to the iron core 631;
wherein the iron core 631 is disposed in a smaller side of the chamber.
The length of the smaller side of the chamber is greater than the length of the plunger 631 to allow the plunger 631 to move back and forth.
The iron core 631 is far away from one end of the magnet 62 and is annularly sleeved with the guide shaft sleeve 610 and the magnetic conduction plate 69.
The magnet 62 can be made of permanent magnet or electrician pure iron;
when the magnet 62 is made of a permanent magnet, the operating mechanism is of a magnetic holding type, when the coil 65 is connected with forward current, the magnet 62 is magnetized to attract the movable iron core 63 to move forward and attract, after the coil 65 is powered off, because the magnet 62 and the movable iron core 63 are kept in an attraction state under the magnetic action of the magnet 62, when the coil 65 is connected with reverse current, the magnet 62 is demagnetized, and the movable iron core 63 moves backward under the action of the reaction spring 64, the brake is in place, and the impact force during brake opening is relieved by a buffer washer;
when the magnet 62 is made of electrician pure iron, the operating mechanism is of an electric holding type, when the coil 65 is connected with current, the magnet 62 is magnetized, the movable iron core 63 is attracted to move forwards and is attracted, the coil 65 needs to be always electrified to be in a holding state, after the coil 65 is disconnected with the current, the magnetism of the magnet 62 disappears, the movable iron core 63 moves backwards under the action of the counter spring 64, the brake is in place, and the impact force during brake opening is relieved by the aid of the buffer washer.
In the above embodiment, when the front end of the shaft 636 is stressed, the shaft 636 slides backward in the plunger 631, the spring 632 ensures contact pressure, and when the front end of the shaft 636 is unstressed, the shaft 636 slides forward in the plunger 631, the adjusting washer 634 stops, and the butterfly spring 635 buffers.
By changing the material of the iron core and keeping other parts unchanged, the switching of the magnetic holding or electric holding type of the operating mechanism can be realized;
when the small-sized direct current quick breaker operating mechanism is of a magnetic holding type, the small-sized direct current quick breaker operating mechanism has the characteristics of rapid switching-off and switching-on, reliable switching-on holding, contact pressure guarantee at the switching-on position, and no electric energy consumption during switching-on.
In one embodiment, the arc chute 9 comprises:
the first arc extinguishing encloser 91 and the second arc extinguishing encloser 92 are symmetrically arranged, and the first arc extinguishing encloser 91 and the second arc extinguishing encloser 92 are communicated to form a hollow space;
the first magnetic conduction plate 93 and the second magnetic conduction plate 94 are respectively arranged on the surface of the first arc extinguishing enclosure 91 and the surface of the second arc extinguishing enclosure 92 in a surface-mounted manner; and
two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser 91 and the second arc extinguishing encloser 92, and two groups of arc extinguishing grid pieces 96 are spaced at a certain distance to form an arc extinguishing channel 95;
each arc-extinguishing grid plate 96 is formed by overlapping a metal grid plate 961 and an insulating grid plate 962, and a gap is formed in each arc-extinguishing grid plate 96;
the first arc extinguishing enclosure 91 surface and the second arc extinguishing enclosure 92 surface are respectively provided with a first magnetic conduction block 97 and a second magnetic conduction block 98, the first magnetic conduction block 97 is connected to the first magnetic conduction plate 93, and the second magnetic conduction block 98 is connected to the second magnetic conduction plate 94;
an arc baffle 99 is arranged on the top of the hollow space and is positioned above the arc extinguishing channel 95.
It should be specifically noted that, along the moving direction of the current arc in the arc extinguishing channel 95, the arc chute 95 is disposed obliquely and at an acute angle with the first arc extinguishing enclosure 91 and the second arc extinguishing enclosure 92.
In one embodiment, the magnetic blowing mechanism 7 includes a movable contact 71, a fixed contact 72, a first excitation coil 73, a second excitation coil 74, an excitation core 75, and a main arc striking bank 76;
wherein the first excitation coil 73 and the second excitation coil 74 are arranged on the main conductive row 1, and the first excitation coil 73 and the second excitation coil 74 are both connected to the main ignition row; the same field core 75 is disposed at the center of the first and second field coils 73 and 74, and the first and second field coils 73 and 74 are insulated and isolated from each other; the first magnetic conduction block 97 and the second magnetic conduction block are respectively arranged at two ends of the excitation iron core 75, wherein the first magnetic conduction block 97 is connected with the first magnetic conduction plate, and the second magnetic conduction block is connected with the second magnetic conduction plate; a first magnetic conduction plate 93 and a second magnetic conduction plate 94 which are respectively arranged on the surface of the arc extinguishing chamber in a surface-mounted manner;
the moving contact 71 is rotatably hinged on the main conducting bar 1, and the moving contact 71 and the fixed contact 72 can be switched on/off under the pushing of an external switching-on/off operating mechanism; the static contacts 72 and the main arc striking row are arranged in the arc extinguishing chamber.
It should be specifically noted that the static contact 72 includes a static arc striking bar 721, a static conductive bar 722 and a static contact silver point 723, the static conductive bar 722 is connected to the arc extinguishing chamber 9, the static contact silver point 723 is disposed on the static conductive bar 722, the static arc striking bar 721 is connected to the static contact silver point, wherein under the pushing of an external opening/closing operation mechanism, the static contact silver point and the movable contact can be connected/disconnected.
It should be specifically noted that, along the moving direction of the current arc in the arc extinguishing channel, the widths of the metal grid plates are sequentially increased, and the widths of the upper insulating grid plate and the lower insulating grid plate corresponding to each metal grid plate are also sequentially increased.
When the switch is disconnected with overload or short-circuit current, an electric arc is generated between the movable contact 71 and the fixed contact 72, the electric arc current flows through the fixed contact → the static arc striking row 721 → the first excitation coil 73 and the second excitation coil 74 → the lower conductive row to form a magnetic circuit, the excitation iron cores 704 and 705 at the centers of the first excitation coil 73 and the second excitation coil 74 are magnetized, and then the magnetic field is guided to the first magnetic conduction plate 93 and the second magnetic conduction plate 94 through the first magnetic conduction block 97 and the second magnetic conduction block 98, so that a magnetic field is formed between the first magnetic conduction plate 93 and the second magnetic conduction plate 97, the first magnetic conduction plate 93 is a magnetic field "+" pole, the second magnetic conduction plate is a magnetic field "-" pole, and the electric arc is attracted to enter the arc extinguishing chamber more quickly. When the direction of the arc current is reversed, a magnetic field can be effectively formed between the first magnetic conduction plate and the second magnetic conduction plate, the first magnetic conduction plate is a magnetic field minus pole, the second magnetic conduction plate is a magnetic field plus pole, and the arc is quickly led into the arc extinguishing cover. The electric arc between the moving contact and the static contact is led into the arc extinguishing cover by the arc striking row and is elongated, and the electric arc is quickly led into the arc extinguishing grid pieces of the two groups of stacking layers under the combined action of the magnetic fields of the first magnetic conduction plate and the second magnetic conduction plate, so that the electric arc is quickly cooled and extinguished.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (9)

1. A small-sized direct current quick breaker is characterized by comprising a switch body and an arc extinguishing chamber arranged above the switch body, wherein a main conducting bar, a contact system, a switching-on/off operating mechanism, an electromagnetic operating mechanism and a magnetic blowing mechanism are arranged in the switch body;
the arc chute includes:
the first arc extinguishing encloser and the second arc extinguishing encloser are symmetrically arranged, and the first arc extinguishing encloser and the second arc extinguishing encloser are communicated to form a hollow space together;
the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the first arc extinguishing cover shell and the surface of the second arc extinguishing cover shell in a surface-mounted manner; and
two groups of arc extinguishing grid pieces are symmetrically arranged in the first arc extinguishing encloser and the second arc extinguishing encloser, and are separated by a certain distance to form an arc extinguishing channel;
each arc-extinguishing grid sheet is formed by overlapping a metal grid sheet and an insulating grid sheet, and a notch is formed in each arc-extinguishing grid sheet; gaps on two adjacent arc extinguishing grid pieces are arranged in a staggered mode;
the first arc extinguishing cover shell surface and the second arc extinguishing cover shell surface are respectively provided with a first magnetic conduction block and a second magnetic conduction block, the first magnetic conduction block is connected with the first magnetic conduction plate, and the second magnetic conduction block is connected with the second magnetic conduction plate;
and an arc baffle plate is arranged at the top of the hollow space and is positioned above the arc extinguishing channel.
2. A miniature direct current fast circuit breaker according to claim 1 wherein said electromagnetic operating mechanism comprises:
the device comprises a shell, a handle and a handle, wherein the shell is provided with a concentric circular truncated cone-shaped cavity, and the side wall of the shell is hollow;
the magnet is arranged in one larger side of the chamber and has a hollow cylindrical structure;
the movable iron core is arranged in the cavity, and the movable iron core is partially arranged in the magnet in a penetrating way; the back end of the movable iron core is sleeved with a counter-force spring; and
a coil disposed within a sidewall of the chamber;
the movable iron core comprises:
the iron core is internally provided with a front end cavity and a rear end cavity which are communicated through a partition plate arranged in the iron core; a spring and a first gasket are arranged in a front end cavity in the iron core; an adjusting washer and a butterfly spring are arranged in a rear end cavity in the iron core;
a shaft partially penetrating the spring and the first washer; and
the screw penetrates through the adjusting washer and the butterfly spring and is connected with the iron core;
wherein the iron core is arranged in the smaller side of the cavity.
3. A small dc quick circuit breaker according to claim 2, characterized in that the length of the smaller side of the chamber is greater than the length of the core to allow the core to move back and forth.
4. The miniature dc quick circuit breaker according to claim 1, wherein said arc chute pieces are disposed obliquely and at an acute angle to said first arc chute shell and said second arc chute shell along a moving direction of the current arc in said arc chute.
5. The miniature direct current fast circuit breaker according to claim 1, wherein said magnetic blow-out mechanism comprises a moving contact, a stationary contact, a first exciting coil, a second exciting coil, an exciting core, a main striking bar;
the first excitation coil and the second excitation coil are arranged on the main conductive row, and both the first excitation coil and the second excitation coil are connected to the main arc striking row; the center of the first excitation coil and the center of the second excitation coil are provided with the same excitation iron core, and the first excitation coil and the second excitation coil are insulated and isolated from each other; the two ends of the excitation iron core are respectively provided with the first magnetic conduction block and the second magnetic conduction block, wherein the first magnetic conduction block is connected with the first magnetic conduction plate, and the second magnetic conduction block is connected with the second magnetic conduction plate; the first magnetic conduction plate and the second magnetic conduction plate are respectively arranged on the surface of the arc extinguishing cover in a surface-mounted manner;
the moving contact is rotatably hinged on the main conductive bar, and the moving contact and the fixed contact can be switched on/off under the pushing of an external switching-on/switching-off operating mechanism;
the static contact and the main arc striking row are arranged in the arc extinguishing cover.
6. The miniature direct current fast circuit breaker according to claim 5, wherein the static contact comprises a static arc striking bar, a static conductive bar and a static contact silver point, the static conductive bar is connected to the arc extinguishing chamber, the static contact silver point is arranged on the static conductive bar, the static arc striking bar is connected to the static contact silver point, wherein the static contact silver point and the movable contact can be connected/disconnected under the pushing of an external opening/closing operation mechanism.
7. The miniature direct current fast circuit breaker of claim 5, wherein said main striking bank comprises a main striking bank and a main conducting bank, wherein said main striking bank is connected to said main conducting bank.
8. The small-sized direct current quick circuit breaker according to claim 5, wherein the widths of the metal grid pieces are sequentially increased in a moving direction of a current arc in the arc extinguishing passage, and the widths of the upper insulation grid piece and the lower insulation grid piece corresponding to each of the metal grid pieces are also sequentially increased.
9. The miniature dc fast circuit breaker of claim 5, further comprising an overcurrent trip mechanism, secondary loop auxiliary contacts.
CN202111042208.6A 2021-09-07 2021-09-07 Small-size direct current quick circuit breaker Pending CN113889380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111042208.6A CN113889380A (en) 2021-09-07 2021-09-07 Small-size direct current quick circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111042208.6A CN113889380A (en) 2021-09-07 2021-09-07 Small-size direct current quick circuit breaker

Publications (1)

Publication Number Publication Date
CN113889380A true CN113889380A (en) 2022-01-04

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ID=79008300

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111042208.6A Pending CN113889380A (en) 2021-09-07 2021-09-07 Small-size direct current quick circuit breaker

Country Status (1)

Country Link
CN (1) CN113889380A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU214912U1 (en) * 2022-07-07 2022-11-21 Общество с ограниченной ответственностью "КАМЕНСКИЙ ЗАВОД ТРАНСПОРТНОГО МАШИНОСТРОЕНИЯ" Magnetic contactor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU214912U1 (en) * 2022-07-07 2022-11-21 Общество с ограниченной ответственностью "КАМЕНСКИЙ ЗАВОД ТРАНСПОРТНОГО МАШИНОСТРОЕНИЯ" Magnetic contactor

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