CN112768290A - Low-voltage vacuum circuit breaker - Google Patents
Low-voltage vacuum circuit breaker Download PDFInfo
- Publication number
- CN112768290A CN112768290A CN201911061770.6A CN201911061770A CN112768290A CN 112768290 A CN112768290 A CN 112768290A CN 201911061770 A CN201911061770 A CN 201911061770A CN 112768290 A CN112768290 A CN 112768290A
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- China
- Prior art keywords
- electromagnet
- iron core
- circuit breaker
- tripping
- vacuum arc
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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
-
- 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
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
The invention discloses a low-voltage vacuum circuit breaker, which relates to the technical field of vacuum circuit breakers and comprises an electromagnet, a rotating support and a vacuum arc extinguish chamber, wherein the axial direction of the electromagnet is parallel to the axial direction of the vacuum arc extinguish chamber, the electromagnet controls a moving contact and a fixed contact in the vacuum arc extinguish chamber to be contacted or separated through the rotating support to realize switching on and switching off, and the moving direction of a moving iron core of the electromagnet is opposite to the moving direction of a moving contact in the vacuum arc extinguish chamber. The vacuum circuit breaker disclosed by the invention adopts an up-and-down layout, the axis direction of the electromagnet is parallel to the axial direction of the vacuum arc-extinguishing chamber, the integration level of product parts is increased, the space is effectively utilized, and the whole structure of the circuit breaker is more compact.
Description
Technical Field
The invention relates to the technical field of vacuum circuit breakers, in particular to a low-voltage vacuum circuit breaker.
Background
A vacuum circuit breaker on the existing market comprises vacuum interrupter, contact spring, link assembly, electro-magnet, reset spring, mounting base etc. and the action process is as follows:
1) after the electromagnet is electrified, the movable iron core and the static iron core are closed to drive the connecting rod assembly to move, so that movable and static contacts in the vacuum arc extinguishing chamber are pushed to be closed, meanwhile, the contact spring is compressed to provide pressure for the contact, and the reset spring for resetting the electromagnet when the electromagnet is powered off is compressed to store energy;
2) when the electromagnet is de-energized, the moving contact of the vacuum arc extinguish chamber is separated from the fixed contact under the action of the contact spring and the reset spring, and meanwhile, the moving iron core of the electromagnet is reset under the action of the reset spring.
Problems with the structure of current vacuum circuit breakers:
1. the electromagnet is vertically installed relative to the vacuum arc-extinguishing chamber, so that the overall height size of the vacuum circuit breaker is increased, and the space utilization rate is not high.
2. The movable iron core of the electromagnet is directly connected with the connecting rod assembly, so that counter force exists when the movable iron core is closed towards the static iron core, the required initial suction force is large, and the load of the electromagnetic coil is increased.
3. The stroke of the circuit breaker can not be adjusted, and the quality consistency is difficult to guarantee.
4. The vertical layout is adopted, the main circuit (the vacuum arc extinguish chamber) is arranged at the upper part, the electromagnet (the control circuit) is arranged at the lower part, in the vertical installation mode of the circuit breaker, the switch-on/switch-off button needs to be additionally installed on a guide rail of a switch cabinet, and the installation space of a product is increased.
5. No overload and short-circuit protection function.
Disclosure of Invention
The object of the present invention is to provide a low voltage vacuum circuit breaker to solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the axial direction of the electromagnet is parallel to the axial direction of the vacuum arc extinguish chamber, the electromagnet controls the movable contact and the fixed contact in the vacuum arc extinguish chamber to be contacted or separated through the rotating support to realize switching on and switching off, and the moving direction of the movable iron core of the electromagnet is opposite to the moving direction of the movable contact in the vacuum arc extinguish chamber.
Furthermore, the electromagnet and the vacuum arc-extinguishing chamber are positioned on the same side of the rotating support, the lower end of the rotating support is connected with a movable contact end of the vacuum arc-extinguishing chamber, the upper end of the rotating support is connected with the electromagnet, the rotating support can rotate around a fulcrum, and the fulcrum is positioned in the middle of the rotating support.
Furthermore, the rotating bracket is connected with the electromagnet through a tripping mechanism, the tripping mechanism and the electromagnet are arranged in a position relation that the movable iron core of the electromagnet is abutted against the tripping mechanism in a normal working state of the circuit breaker, and a pre-stroke gap is formed between the movable iron core and the tripping mechanism after the electromagnet is de-energized
Furthermore, a wiring board is connected respectively to the movable contact end and the stationary contact end of vacuum interrupter, and the wiring board of vacuum interrupter movable contact end is located between vacuum interrupter and tripping device and extends towards circuit breaker the place ahead, and the wiring board of vacuum interrupter's stationary contact end extends towards the circuit breaker rear.
Furthermore, a wiring board at the movable contact end of the vacuum arc extinguish chamber is connected with a thermomagnetic trigger unit, a draw bar is arranged between the thermomagnetic trigger unit and the tripping mechanism, the tripping mechanism has a locking state and a tripping state, the tripping mechanism is in the locking state under the normal working state of the circuit breaker, and when the circuit breaker is overloaded or short-circuited, the thermomagnetic trigger unit triggers the draw bar, so that the draw bar triggers the tripping mechanism to switch the tripping mechanism from the locking state to the tripping state.
Furthermore, the thermomagnetic trigger unit comprises a thermal tripping element and a magnetic tripping element, when the circuit breaker is overloaded, the traction rod is triggered by the thermal tripping element, and when the circuit breaker is short-circuited, the traction rod is triggered by the magnetic tripping element.
Furthermore, a reset alarm mechanism is connected above the tripping mechanism and electrically connected with the electromagnet, when the breaker has a short circuit or overload fault, the reset alarm mechanism enables the electromagnet to be reset in a power-off mode and outputs an alarm signal to a user, and the tripping mechanism can be restored to a lock catch state from a tripping state by manually pressing the reset alarm mechanism.
Furthermore, an adjusting nut used for adjusting the action stroke of the circuit breaker is arranged at the joint of the movable iron core of the electromagnet and the tripping mechanism.
Further, the electro-magnet is direct action type electro-magnet, has and moves iron core, quiet iron core, coil and push rod, moves the iron core and just moves the iron core and can follow quiet iron core axial slip with quiet iron core is relative, and the push rod runs through and moves iron core and quiet iron core, and the one end of push rod with move iron core fixed connection, the other end outside wearing out quiet iron core, move iron core and quiet iron core setting in the coil hole.
Furthermore, low pressure vacuum circuit breaker still includes the extension spring that resets, and extension spring that resets one end connection rotates the upper end of support, other end connection electro-magnet, and the extension spring that resets is elongated the energy storage when the circuit breaker closes a floodgate.
Compared with the prior art, the invention has the following advantages:
1. the vertical layout is adopted, the axis direction of the electromagnet is parallel to the axial direction of the vacuum arc-extinguishing chamber, the integration level of product parts is increased, the space is effectively utilized, and the whole structure of the circuit breaker is more compact.
2. The upper and lower overall arrangement of adoption can set up electro-magnet (control circuit) in major loop (vacuum interrupter) top to install the weak current circuit on comparatively being close to human circuit breaker upper portion, set up the strong current circuit in the circuit breaker lower part in order to keep away from the human body, increase the security, and in the vertical mounting means of circuit breaker, the divide-shut brake button of circuit breaker can be installed on circuit breaker upper portion, makes circuit breaker structure compacter.
3. The thermomagnetic trigger unit is arranged on the main loop wiring board, and the corresponding tripping mechanism is arranged, so that when overload/short circuit faults occur on a circuit, the thermomagnetic trigger unit triggers the tripping mechanism to enable the circuit breaker to trip quickly, the whole circuit system is prevented from being damaged, and the safety is improved.
4. The structure effectively utilizes space, the whole structure of the circuit breaker is more compact, and the positions of the thermomagnetic trigger unit, the draw bar and the tripping mechanism are close, thereby being beneficial to the transmission of actions.
5. The moving iron core of the electromagnet and the tripping mechanism have a pre-stroke gap, and the moving iron core and the static iron core of the electromagnet are started in no-load due to no counter force when being closed, so that the required electromagnetic attraction is reduced, and the load of the electromagnetic coil is lightened.
6. The connection part of the tripping mechanism and the movable iron core is provided with an adjusting nut for adjusting the action stroke of the circuit breaker, so that the circuit breaker is convenient to assemble and test, and the quality performance of a product is improved.
Drawings
Fig. 1 is a perspective view of an assembled state of a low voltage vacuum circuit breaker according to an embodiment of the present invention;
fig. 2 is an exploded view of a low voltage vacuum circuit breaker according to an embodiment of the present invention;
fig. 3 is a perspective view of a partial internal structure of a low voltage vacuum circuit breaker according to an embodiment of the present invention;
fig. 4 is a front view of a part of the internal structure of a low voltage vacuum circuit breaker according to an embodiment of the present invention;
fig. 5 is a perspective view of the internal structure of a low voltage vacuum circuit breaker according to an embodiment of the present invention;
fig. 6 is a perspective view of a partial internal structure of a low voltage vacuum circuit breaker according to an embodiment of the present invention;
fig. 7 is another angle view of a partial internal structural perspective view of the low voltage vacuum circuit breaker shown in fig. 6;
fig. 8 is a schematic view of the trip mechanism in a latched state;
fig. 9 is a cross-sectional view of the trip mechanism in a latched state;
fig. 10 is a schematic view of the trip mechanism in a tripped state;
fig. 11 is a cross-sectional view of the trip mechanism in a tripped state.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 2.
As shown in fig. 1 to 7, a low-voltage vacuum circuit breaker includes an electromagnet 1, a rotating bracket 4 and a vacuum arc-extinguishing chamber 5, an axial direction of the electromagnet 1 is parallel to an axial direction of the vacuum arc-extinguishing chamber 5, the electromagnet 1 is located above the vacuum arc-extinguishing chamber 5, the electromagnet 1 controls a moving contact and a static contact in the vacuum arc-extinguishing chamber 5 to contact or separate through the rotating bracket 4 to realize switching on and switching off, and a moving direction of a moving core of the electromagnet 1 is opposite to a moving direction of a moving contact in the vacuum arc-extinguishing chamber 5.
Low voltage as used herein refers to a voltage of no more than 1500 volts. The vertical layout is adopted, the electromagnet 1 and the vacuum arc extinguish chamber 5 are horizontally arranged, the opening and closing button 10 of the circuit breaker can be arranged on the upper portion of the circuit breaker in a vertical installation mode of the circuit breaker, the integration level of product parts is increased, the space is effectively utilized, and the whole structure of the circuit breaker is more compact. Adopt upper and lower overall arrangement, can set up control circuit (electro-magnet) in major loop (vacuum interrupter) top, promptly, weak current circuit installs in the circuit breaker openly, and strong current circuit installs in the circuit breaker bottom, has strengthened the security.
As shown in fig. 4, the electromagnet 1 and the vacuum interrupter 5 are located on the same side of the rotating bracket 4, the lower end of the rotating bracket 4 is connected to the movable contact end of the vacuum interrupter 5, the upper end of the rotating bracket 4 is connected to the trip mechanism 2, the rotating bracket 4 can rotate around a fulcrum 9, and the fulcrum 9 is located in the middle of the rotating bracket.
The rotating bracket 4 is connected with the electromagnet 1 through the tripping mechanism 2, the position relation between the electromagnet 1 and the tripping mechanism 2 is configured in such a way that the movable iron core of the electromagnet 1 is abutted against and pushes the tripping mechanism 2 in a normal working state, and a pre-stroke gap is formed between the movable iron core and the tripping mechanism 2 after the electromagnet 1 is de-energized, so that when the electromagnet 1 is de-energized and reset, no counter force exists, no-load starting is carried out, the required electromagnetic attraction force is reduced, and the load of a coil is reduced.
The movable contact end and the fixed contact end of the vacuum arc extinguish chamber are respectively connected with a wiring board 8, the wiring board 8 at the movable contact end of the vacuum arc extinguish chamber is positioned between the vacuum arc extinguish chamber and the tripping mechanism and extends towards the front of the circuit breaker, and the wiring board 8 at the fixed contact end of the vacuum arc extinguish chamber extends towards the rear of the circuit breaker.
The wiring board 8 at the movable contact end of the vacuum arc extinguish chamber is connected with a thermomagnetic trigger unit, a draw bar is arranged between the thermomagnetic trigger unit 7 and the tripping mechanism 2, the tripping mechanism 2 has a locking state and a tripping state, the tripping mechanism 2 is in the locking state in the normal working state of the circuit breaker, when the circuit breaker is overloaded or short-circuited, the thermomagnetic trigger unit 7 triggers the draw bar 6, and then the draw bar 6 triggers the tripping mechanism 2 to switch the tripping mechanism 2 from the locking state to the tripping state.
Specifically, the thermo-magnetic triggering unit 7 includes a thermal trip element and a magnetic trip element, which are connected to the wiring board 8. The thermal trip element comprises a bimetallic strip and the magnetic trip element comprises a magnetic yoke and an armature. When the circuit is overloaded, the bimetallic strip of the thermal tripping element generates heat and deforms to trigger the traction rod 6, and the triggered traction rod 6 drives the tripping mechanism 2 to be switched from a locking state to a tripping state; when a short circuit occurs in the circuit, the magnetic yoke of the magnetic tripping element attracts the armature, the armature triggers the traction rod 6 when rotating, and the triggered traction rod 6 enables the tripping mechanism 2 to be switched from a locking state to a tripping state.
The connection position of the moving iron core of the electromagnet 1 and the tripping mechanism 2 is provided with an adjusting nut used for adjusting the action stroke of the circuit breaker, the adjusting nut is installed on the moving iron core of the electromagnet, and the pre-stroke gap between the moving iron core of the electromagnet and the tripping mechanism 2 is changed by rotating the adjusting nut, so that the action stroke of the circuit breaker is changed, the assembly and test of the circuit breaker are facilitated, and the quality performance of a product is improved.
The circuit breaker still includes reset spring 3, and the upper end of rotating movable support 4 is connected to 3 one end of reset spring, and the other end connects electro-magnet 1, and reset spring 3 is elongated the energy storage when the circuit breaker closes a floodgate.
As shown in fig. 8 to 11, the trip mechanism 2 includes a push rod 201, a first link 202, a second link 203, a connecting rod 204 and a mounting plate, the push rod 201, the first link 202, the second link 203 and the connecting rod 204 are sequentially hinged, the connecting rod 204 is fixedly connected to the mounting plate and is opposite to the electromagnet 1, a stop rod 206 and a trip half shaft 205 are assembled on the mounting plate, the stop rod 206 is provided with a stop rod reset torsion spring, and the trip half shaft 205 is provided with a trip half shaft reset torsion spring.
In a normal operating state of the circuit breaker, as shown in fig. 8 and 9, the stop lever 206 is pressed against the second link 203 by the stop lever return torsion spring, so that the first link 202 and the second link 203 are in a relatively straight state, and the trip half shaft 205 is pressed against the stop lever 206 by the trip half shaft return torsion spring, thereby locking the stop lever 206. At this time, the tripping mechanism 2 is in a locked state, and the electromagnet 1 can push the connecting rod 204 to move the tripping device, so as to push the rotating bracket to rotate, and further to make the moving and static contacts of the vacuum arc-extinguishing chamber contact and close. When the circuit breaker is normally powered off, the tripping mechanism 2 is kept in a locking state.
When the breaker has a short circuit or overload fault, the thermomagnetic trigger unit 7 pulls the draw bar, the draw bar pulls the tripping half shaft 205, so that the limitation on the stop rod 206 is removed, the return spring 3 automatically shortens to pull the rotating bracket towards the electromagnet 1, the rotating bracket 4 rotates around the fulcrum 9 under the action of the return spring 3, the push rod 201 is pushed against the first connecting rod 202 by the thrust on the upper end of the rotating bracket, the second connecting rod 203 overcomes the pressing force of the stop rod 206 on the rotating bracket to rotate, so that the first connecting rod 202 and the second connecting rod 203 are switched from a relatively straight state to a folded state as shown in fig. 10 and 11, the tripping mechanism 2 enters a tripping state, and meanwhile, the lower end of the rotating bracket pulls the movable contact end of the vacuum arc extinguish chamber 5 to separate the movable contact from the fixed contact, so that the.
As shown in fig. 2 and 5, a reset alarm mechanism 11 is arranged above the tripping mechanism 2, and the reset alarm mechanism 11 includes an electromagnet control microswitch, a signal alarm microswitch and a reset button. The tripping mechanism further comprises a reset rod 207, the reset rod 207 abuts above the first connecting rod 202, the reset button is connected with the reset rod 207, and the tripping mechanism 2 can be restored to a locking state from a tripping state by manually pressing the reset button.
The electromagnet control microswitch is electrically connected with the electromagnet 1, when the breaker trips, the electromagnet control microswitch enables the electromagnet 1 to lose power and reset, thrust on the tripping mechanism 2 is cancelled, and the signal alarm microswitch outputs an alarm signal to a user. After the fault is relieved, the tripping mechanism 2 can be restored to the locking state from the tripping state by manually pressing the reset button, and preparation is made for the next closing.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A low-voltage vacuum circuit breaker, characterized in that: the vacuum switch comprises an electromagnet, a rotating support and a vacuum arc extinguish chamber, wherein the axial direction of the electromagnet is parallel to the axial direction of the vacuum arc extinguish chamber, the electromagnet controls a moving contact and a static contact in the vacuum arc extinguish chamber to be contacted or separated through the rotating support to realize switching on and switching off, and the moving direction of a moving iron core of the electromagnet is opposite to the moving direction of a moving contact in the vacuum arc extinguish chamber.
2. Low voltage vacuum interrupter as claimed in claim 1, characterized in that: the electromagnet and the vacuum arc-extinguishing chamber are positioned on the same side of the rotating support, the lower end of the rotating support is connected with a movable contact end of the vacuum arc-extinguishing chamber, the upper end of the rotating support is connected with the electromagnet, the rotating support can rotate around a fulcrum, and the fulcrum is positioned in the middle of the rotating support.
3. Low voltage vacuum interrupter as claimed in claim 2, characterized in that: the rotating bracket is connected with the electromagnet through a tripping mechanism, the tripping mechanism and the electromagnet are arranged in a position relation that the movable iron core of the electromagnet is abutted against and pushed against the tripping mechanism under the normal working state of the circuit breaker, and a pre-stroke gap is formed between the movable iron core and the tripping mechanism after the electromagnet is de-energized.
4. Low voltage vacuum interrupter as claimed in claim 3, characterized in that: the movable contact end and the fixed contact end of the vacuum arc extinguish chamber are respectively connected with a wiring board, the wiring board at the movable contact end of the vacuum arc extinguish chamber is positioned between the vacuum arc extinguish chamber and the tripping mechanism and extends towards the front of the circuit breaker, and the wiring board at the fixed contact end of the vacuum arc extinguish chamber extends towards the rear of the circuit breaker.
5. Low voltage vacuum interrupter as claimed in claim 4, characterized in that: the wiring board at the movable contact end of the vacuum arc extinguish chamber is connected with a thermomagnetic trigger unit, a draw bar is arranged between the thermomagnetic trigger unit and the tripping mechanism, the tripping mechanism has a locking state and a tripping state, the tripping mechanism is in the locking state in the normal working state of the circuit breaker, and when the circuit breaker is overloaded or short-circuited, the thermomagnetic trigger unit triggers the draw bar, so that the draw bar triggers the tripping mechanism to switch the tripping mechanism from the locking state to the tripping state.
6. Low voltage vacuum interrupter as claimed in claim 5, characterized in that: the thermal-magnetic triggering unit comprises a thermal tripping element and a magnetic tripping element, when the circuit breaker is overloaded, the traction rod is triggered by the thermal tripping element, and when the circuit breaker is short-circuited, the traction rod is triggered by the magnetic tripping element.
7. Low voltage vacuum interrupter as claimed in claim 3, characterized in that: the tripping device is characterized in that a reset alarm mechanism is connected above the tripping mechanism and electrically connected with the electromagnet, when the breaker has a short circuit or overload fault, the reset alarm mechanism enables the electromagnet to be in power-off reset and outputs an alarm signal to a user, and the tripping mechanism can be restored to a lock catch state from a tripping state by manually pressing the reset alarm mechanism.
8. Low voltage vacuum interrupter as claimed in claim 3, characterized in that: and an adjusting nut for adjusting the action stroke of the circuit breaker is arranged at the joint of the movable iron core of the electromagnet and the tripping mechanism.
9. Low voltage vacuum interrupter as claimed in claim 1, characterized in that: the electro-magnet is direct action type electro-magnet, has to move iron core, quiet iron core, coil and push rod, moves the iron core and just moves the iron core and can follow quiet iron core endwise slip with quiet iron core relatively, and the push rod runs through and moves iron core and quiet iron core, and the one end of push rod with move iron core fixed connection, the other end wear out outside quiet iron core, move iron core and quiet iron core setting in the coil hole.
10. Low voltage vacuum interrupter as claimed in claim 1, characterized in that: the low-voltage vacuum circuit breaker further comprises a reset tension spring, one end of the reset tension spring is connected with the upper end of the rotating support, the other end of the reset tension spring is connected with the electromagnet, and the reset tension spring is lengthened to store energy when the circuit breaker is switched on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911061770.6A CN112768290A (en) | 2019-11-01 | 2019-11-01 | Low-voltage vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911061770.6A CN112768290A (en) | 2019-11-01 | 2019-11-01 | Low-voltage vacuum circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112768290A true CN112768290A (en) | 2021-05-07 |
Family
ID=75692388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911061770.6A Pending CN112768290A (en) | 2019-11-01 | 2019-11-01 | Low-voltage vacuum circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112768290A (en) |
-
2019
- 2019-11-01 CN CN201911061770.6A patent/CN112768290A/en active Pending
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