CN114429881A - Vacuum circuit breaker - Google Patents
Vacuum circuit breaker Download PDFInfo
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- CN114429881A CN114429881A CN202111572628.5A CN202111572628A CN114429881A CN 114429881 A CN114429881 A CN 114429881A CN 202111572628 A CN202111572628 A CN 202111572628A CN 114429881 A CN114429881 A CN 114429881A
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- contact spring
- contact
- air cavity
- air
- circuit breaker
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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
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention relates to a vacuum circuit breaker, which comprises a vacuum arc extinguish chamber, wherein a moving contact and a static contact of the vacuum arc extinguish chamber are arranged in front of and behind a fixed contact, the rear end of the moving contact is connected with an over-travel buffer device for driving the moving contact to act, the over-travel buffer device comprises a contact spring supporting cylinder, a contact spring and a contact spring pressure rod, and the contact spring pressure rod extends into the contact spring supporting cylinder; when the vacuum arc extinguish chamber is switched on, the contact spring pressing rod applies acting force to the moving contact through the compressed contact spring; the contact spring pressure lever is in front-back stop fit with the contact spring support cylinder, so that when the vacuum arc extinguish chamber is opened, the contact spring pressure lever drives the moving contact spring support cylinder to move backwards, and further drives the moving contact to move; the contact spring pressure rod comprises a rod body and a piston arranged on the rod body and positioned in the contact spring supporting cylinder, and a buffer air cavity is formed by the contact spring pressure rod and the contact spring supporting cylinder in a surrounding mode. The invention reduces the brake-separating speed by arranging the buffer air cavity in the over-travel buffer device, reduces the impact generated by the contact and prolongs the mechanical life of the vacuum arc-extinguishing chamber and the vacuum circuit breaker.
Description
Technical Field
The invention relates to a vacuum circuit breaker, in particular to an over-travel buffer device of the vacuum circuit breaker.
Background
Compared with a mode of realizing insulation by using SF6 gas, the vacuum circuit breaker has no greenhouse effect, has the advantages of small volume, light weight, environmental friendliness, no need of maintenance for arc extinction and the like, is extremely widely applied in medium voltage grades, and is gradually popularized to high voltage grades.
At present, a moving contact of a vacuum circuit breaker realizes switching-on and switching-off operations under the driving of an operating mechanism through a transmission mechanism. For example, the invention patent application with the application publication number of CN102354632A discloses a vacuum interrupter and a vacuum circuit breaker using the vacuum interrupter, the vacuum circuit breaker includes a vacuum interrupter having a moving contact and a static contact, the moving contact of the vacuum interrupter is in transmission connection with an operating mechanism, an over-travel buffer device is arranged between the moving contact and the operating mechanism, the over-travel buffer device includes a contact spring, a lower contact spring pressure bar pushes the contact spring upwards to drive the upper moving contact to perform a closing action, and conversely, the contact spring pressure bar moves downwards to drive the contact to perform a downward opening action.
For another example, a high-voltage vacuum circuit breaker for power transmission disclosed in application publication No. CN110739176A, wherein an over-travel buffering device of the circuit breaker includes a contact spring supporting cylinder, a contact spring is disposed in the contact spring supporting cylinder, and a contact spring pressing rod is movably inserted in the contact spring supporting cylinder.
According to the two vacuum circuit breakers, in the switching-on process of the vacuum arc extinguish chamber, the moving contact and the static contact can be separated from each other due to the action of the electric power when the current flows, in order to overcome the electric power to ensure that the current flows normally, after the switching-on is completed, the contact spring compression rod needs to perform switching-on overtravel movement, namely, after the moving contact and the static contact are contacted with each other and keep relatively static, the contact spring compression rod can continue to move for a certain stroke in the switching-on direction, and the contact reliability of the moving contact and the static contact under the rated current flow is ensured by compressing the contact spring. And on the contrary, the opening process is opposite, the moving contact is accelerated in the opening overtravel stage so as to ensure that the moving contact has certain opening speed in the just time-sharing process, so that arc extinction and current breaking are smoothly realized, and then the moving contact continues to move towards the opening direction under the driving of the operating mechanism until the predetermined opening position is reached, so that the insulation strength between the moving contact and the static contact is ensured. In summary, the switching-on and switching-off process of the vacuum arc-extinguishing chamber can be divided into four stages of switching-on, switching-on over travel, switching-off over travel and switching-off.
Because the contact spring connected between the moving contact and the operating mechanism is in flexible connection, the relative rest between the moving contact and the contact spring pressure rod can not be always kept in the opening and closing process. Meanwhile, the vacuum circuit breaker has to have proper opening and closing speeds in the opening and closing processes, the electric abrasion of the contact is easily aggravated due to pre-breakdown when the closing speed is too low, and the contact is easily subjected to fusion welding; similarly, the opening speed also needs to be in a certain range, the failure of reigniting and opening of the electric arc can be caused when the opening speed is too low, and the overshoot is increased when the speed is too high, so that the service life of the corrugated pipe is seriously affected, and further the service life of the key parts of the vacuum arc extinguish chamber and the whole vacuum arc extinguish chamber is affected.
Disclosure of Invention
The invention aims to provide a vacuum circuit breaker, which is used for solving the technical problem that the service life of key parts of a vacuum arc extinguish chamber is greatly influenced due to the fact that the difference between the step and the action of an operating mechanism is larger because a moving contact is subjected to larger impact when the moving contact is opened in the prior art.
In order to achieve the purpose, the technical scheme of the vacuum circuit breaker provided by the invention is as follows:
a vacuum circuit breaker comprises a vacuum arc extinguish chamber, wherein a moving contact and a fixed contact are arranged in the vacuum arc extinguish chamber, the moving contact and the fixed contact are arranged in front and back, the front end of the moving contact is a conductive contact end in conductive contact with the fixed contact, the rear end of the moving contact is a connecting end extending out of the arc extinguish chamber, the connecting end is connected with an over-travel buffer device for driving the moving contact to act, the over-travel buffer device comprises a contact spring supporting cylinder, a contact spring and a contact spring pressure rod, the front end of the contact spring supporting cylinder is in transmission fit with the moving contact, the contact spring pressure rod extends into the contact spring supporting cylinder, and the contact spring is positioned between a cylinder body and the contact spring pressure rod; when the vacuum arc extinguish chamber is switched on, the contact spring pressing rod applies acting force to the moving contact through the compressed contact spring; the contact spring pressure lever is in front-back stop fit with the contact spring support cylinder, so that when the vacuum arc extinguish chamber is opened, the contact spring pressure lever drives the moving contact spring support cylinder to move backwards, and further drives the moving contact to move; the contact spring pressure rod comprises a rod body and a piston arranged on the rod body and positioned in the contact spring supporting cylinder, and a buffer air cavity is formed by the contact spring pressure rod and the contact spring supporting cylinder in a surrounding mode.
The beneficial effects are that: the invention encloses a buffer air cavity in a contact spring supporting cylinder of an over-travel buffer device, a piston is arranged on a contact spring pressure rod extending into the contact spring supporting cylinder, so that the contact spring pressure rod can buffer the motion of a moving contact by compressing air in the buffer air cavity in the process of pressing the contact spring against the contact spring and moving relative to the contact spring supporting cylinder, thereby not only ensuring that the moving contact and a static contact can have a closing holding force between a moving contact and a static contact by virtue of the pressure of the contact spring when closing, but also preventing the contact spring pressure rod from moving in the contact spring supporting cylinder because the piston is subjected to pressure resistance in the buffer air cavity in the process of opening the brake, further reducing the action inconsistency between the contact spring pressure rod and the contact spring supporting cylinder as much as possible, namely, reducing the action inconsistency between the moving contact and an operating mechanism, and further relieving the impact on the moving contact when opening the brake, the influence on the service life of the critical parts of the circuit breaker is reduced.
As a further improvement, a damping channel for air to enter and exit the buffer air cavity is arranged on the wall of the buffer air cavity, or an exhaust valve which is discharged after the air in the buffer air cavity reaches a set pressure and an air supplementing channel which enables the air to enter the buffer air cavity are arranged on the wall of the buffer air cavity.
The beneficial effects are that: according to the invention, the damping channel or the exhaust valve and the air supply channel are arranged on the cavity wall of the buffer air cavity, so that the air pressure in the buffer air cavity can be discharged outwards, and further, after the switch-on and the switch-off are in place, the air pressure in the buffer air cavity can not be always in a high-pressure or low-pressure condition, and the influence on the overtravel of the switch-on is reduced while the movable contact is buffered.
As further improvement, contact spring supporting cylinder includes barrel and the air cavity shrouding of setting in the barrel, and the front end and the moving contact of barrel are connected, and contact spring depression bar passes the air cavity shrouding, and the contact spring is in the front side of air cavity shrouding, and piston and air cavity shrouding are interval from beginning to end to be set up, and the buffering air cavity is in between piston and the air cavity shrouding.
The beneficial effects are that: according to the invention, the buffer air cavity is formed in the contact spring supporting cylinder behind the contact spring, the contact spring is positioned outside the buffer air cavity, and the whole contact spring supporting cylinder is not required to be set into a sealed cavity, so that the structure of the front part of the over-travel buffer device can be kept unchanged as much as possible, and the cost is reduced.
As a further improvement, the contact spring pressure rod penetrates through the air cavity sealing plate and is in clearance fit with the air cavity sealing plate, the piston is in clearance fit with the contact spring support cylinder, and the clearance between the air cavity sealing plate and the contact spring pressure plate and the clearance between the piston and the contact spring support cylinder form the air supplementing channel.
The beneficial effects are that: according to the invention, the assembly clearance between the contact spring compression bar and the air cavity sealing plate and the assembly clearance between the piston and the contact spring support cylinder are used as air supply channels, so that no extra hole is required, and the processing difficulty is reduced; meanwhile, the reserved assembly gap can reduce the resistance borne by the contact spring pressure rod and increase the load borne by the operating mechanism as little as possible.
As a further improvement, the exhaust valve is arranged on the air cavity closing plate.
The beneficial effects are that: the exhaust valve is arranged on the air cavity sealing plate, compared with the exhaust valve arranged on other components, the exhaust valve is more convenient to assemble with the air cavity sealing plate with a simple structure, and can be arranged in the contact spring supporting cylinder together.
As a further improvement, the air cavity sealing plate is provided with a valve port, the exhaust valve comprises a valve plate arranged at the valve port and a valve plate retaining spring for applying elastic force to the valve plate, and the valve plate retaining spring is used for enabling the valve plate to be deformed and opened after the air in the buffer air cavity reaches the set pressure.
The beneficial effects are that: the invention directly arranges the exhaust valve with simple structure on the air cavity sealing plate, and simplifies the structure of the over travel buffer device.
As a further improvement, a guide bolt is fixed on the air cavity sealing plate, and the valve plate retaining spring is sleeved on the guide bolt.
The beneficial effects are that: the invention improves the moving stability of the valve plate by arranging the guide bolt.
As a further improvement, the bolt head of the guide bolt is used for stop-matching with the contact spring pressure rod, so that the contact spring pressure rod drives the contact spring support cylinder to move backwards.
The beneficial effects are that: according to the invention, the guide bolt of the exhaust valve is in stop fit with the contact spring compression bar, so that a space for the valve plate to move can be reserved between the air cavity sealing plate and the contact spring compression bar, and the valve plate is protected from being extruded by the contact spring compression bar.
As a further improvement, the guide bolts are uniformly arranged along the circumferential direction of the air cavity closing plate at intervals.
The beneficial effects are that: the invention can improve the stability of stop matching with the contact spring compression bar by arranging a plurality of guide bolts.
As a further improvement, an end cover hole for inserting the threaded connecting column is formed in the front end cover of the contact spring supporting cylinder, and a fixing nut for fixing the front end cover and the moving contact is arranged on the threaded connecting column.
The beneficial effects are that: the invention is convenient to assemble by reserving the threaded mounting hole at the front end of the contact spring supporting cylinder.
Drawings
Fig. 1 is a schematic structural view of an embodiment 1 of a vacuum circuit breaker according to the present invention;
fig. 2 is a schematic structural view of an over travel buffering device in embodiment 1 of a vacuum circuit breaker according to the present invention;
fig. 3 is a schematic perspective view of a contact spring rod and an exhaust valve of an over travel buffer device in embodiment 1 of a vacuum circuit breaker according to the present invention;
description of reference numerals:
1. an upper wiring board; 2. a composite sleeve; 3. a vacuum arc-extinguishing chamber; 4. a lower wiring board; 5. a contact spring; 6. a contact spring support cylinder; 7. static contact; 8. a moving contact; 9. a bellows; 10. a contact spring compression bar; 101. a rod body; 102. a piston; 11. a valve plate retaining spring; 12. a guide bolt; 13. a valve plate; 14. an air cavity closing plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrases "comprising an … …," or the like, do not exclude the presence of such elements, processes, or methods.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
The specific embodiment 1 of the vacuum circuit breaker provided by the invention: in this embodiment, a vacuum circuit breaker will be described as an example. As shown in fig. 1 to 3, the vacuum circuit breaker includes a composite sleeve 2, and a vacuum interrupter 3, an upper wiring board 1 and a lower wiring board 4 located in the composite sleeve 2, wherein the vacuum interrupter 3 has an outer housing, and a static contact 7 and a moving contact 8 located in the outer housing, the static contact 7 and the moving contact 8 are arranged along a front-back direction, and the static contact 7 is electrically connected with the upper wiring board 1; the 8 overcoat of moving contact is equipped with bellows 9, and the front end of moving contact 8 is the electrically conductive contact jaw with static contact 7 conductive contact, and the rear end is for stretching out the outside movable conducting rod of shell body, and movable conducting rod activity passes lower wiring board 4, and with lower wiring board 4 conductive contact, movable conducting rod constitutes the linkage segment of moving contact, and the link is connected with the buffer that is used for driving the overtravel of moving contact action.
The over-travel buffer device comprises a contact spring supporting cylinder 6, a contact spring 5 and a contact spring pressure rod 10, wherein the axis of the contact spring supporting cylinder 6 extends along the front-back direction and comprises a cylinder body and an air cavity sealing plate 14 positioned in the cylinder body, and the contact spring pressure rod 10 penetrates through the air cavity sealing plate 14 and extends into the contact spring supporting cylinder 6. The front end of the contact spring supporting cylinder 6 is directly and fixedly connected with the moving contact 8, specifically, the rear end of the moving conducting rod is provided with a threaded connecting column, an end cover hole for inserting the threaded connecting column is formed in the front end cover of the contact spring supporting cylinder, during installation, the threaded connecting column penetrates into the end cover hole, a fixing nut is connected onto the threaded connecting column, and the front end cover is fixedly connected with the moving contact. The contact spring support cylinder 6 is divided into a front part and a rear part by an air cavity sealing plate 14, the contact spring 5 is positioned in front of the air cavity sealing plate 14, a buffer air cavity is enclosed by the air cavity sealing plate 14, the cylinder body and the contact spring compression rod 10, and the buffer air cavity is positioned behind the air cavity sealing plate 14. The contact spring support cylinder 6 is provided with a through hole (not shown) at a portion thereof on the front side of the air chamber closing plate 14 for communicating the contact spring support cylinder 6 with the outside. In other embodiments, the inner cavity of the portion of the contact spring support cylinder located on the front side of the air cavity sealing plate may be a sealed cavity.
The contact spring pressing rod 10 comprises a rod body 101 and a piston 102 arranged on the rod body 101 and positioned in a contact spring supporting cylinder, wherein the rod body penetrates through an air cavity sealing plate, and the front end of the rod body 10 is provided with a supporting plate used for being matched with a contact spring. The piston 102 and the air cavity sealing plate 14 are arranged at intervals in the front and back, and the piston 102 is used as a movable cavity wall of the buffer air cavity and surrounds the buffer air cavity together with the air cavity sealing plate and the contact spring supporting cylinder. An exhaust valve is arranged on the air cavity sealing plate 14, valve ports are formed in the air cavity sealing plate 14 at intervals along the circumferential direction, the exhaust valve comprises a valve plate 13 arranged at the valve port and a valve plate retaining spring 11 for applying elasticity to the valve plate, the valve plate retaining spring 11 is used for enabling the valve plate to deform and open after the air in the buffer air cavity reaches a set pressure, a guide bolt 12 is fixed on the air cavity sealing plate 14 in a threaded mode, and the valve plate retaining spring 11 is sleeved on the guide bolt. When the contact spring pressing rod 10 moves backwards, the rear side surface of the supporting plate on the contact spring pressing rod 10 is in stop fit with the bolt head of the guide bolt 12, so that the contact spring pressing rod 10 drives the contact spring supporting cylinder to move backwards.
The guide bolts are uniformly arranged at intervals along the circumferential direction of the air cavity sealing plate, the valve ports are long waist-shaped ports, and the valve ports and the guide bolts are circumferentially and alternately arranged.
In this embodiment, a gap is formed between the outer periphery of the rod body 101 and the air cavity sealing plate 14, a gap is also formed between the outer periphery of the piston and the inner wall of the contact spring support cylinder, and the gap between the air cavity sealing plate 14 and the contact spring pressing plate 10 and the gap between the piston 102 and the contact spring support cylinder 6 both form an air supply channel, so that in the opening process of the vacuum circuit breaker, external air can enter the buffer air cavity chamber through the air supply channel, and the air supply channel can be used in the next opening and closing operation.
In the vacuum circuit breaker, when the vacuum circuit breaker is switched on and off, the operating mechanism drives the contact spring pressure rod to move through the transmission mechanism, the contact spring pressure rod indirectly drives the moving contact and the contact spring supporting cylinder to move towards the fixed contact through the contact spring, when the moving contact and the contact spring pressure rod are kept to be relatively static, the distance between the air cavity sealing plate and the piston is unchanged, the valve plate is tightly attached to the air cavity sealing plate under the pressure of the valve plate retaining spring, and a valve port on the air cavity sealing plate is sealed.
At the closing overtravel stage, the buffer air cavity is compressed, the contact spring pressure rod moves forward for a certain distance relative to the moving contact, and the support plate is positioned at the front side of the bolt head of the guide bolt at the moment.
When the brake is switched off, the operating mechanism drives the contact spring pressure rod to move backwards quickly until the supporting plate impacts the bolt head, so that the movable contact is impacted and then moves backwards quickly, the instantaneous speed exceeds the backward moving speed of the movable contact spring pressure rod, the buffer air cavity is compressed at the moment, the buffer effect is achieved, and the movement consistency of the movable contact and the movable contact spring pressure rod is reduced.
It should be noted that, at the closing overtravel stage, the buffer air cavity is compressed by a certain space, when the opening starts, the contact spring pressing rod moves backwards quickly to the front of the impact of the bolt head of the guide bolt, the buffer air cavity can not be restored to the initial state in time, but the distance of backward impact of the moving contact after the impact of the bolt head of the guide bolt is far greater than the distance of compression of the buffer air cavity at the closing overtravel stage, and therefore the buffer effect of the buffer air cavity on the moving contact is not influenced.
In the process of opening and closing the switch, when the speed of the moving contact is different from the speed of the contact spring pressure rod, the relative position of the piston and the air cavity sealing plate is reduced, air in the cavity is compressed, the valve plate is pushed open when the air pressure exceeds the elastic force of the valve plate maintaining spring, the air is discharged from the valve port and generates certain air pressure acting force, the relative speed between the moving contact and the contact spring pressure rod is forced to be reduced, finally, the moving contact and the contact spring pressure rod are kept relatively static, and the valve port is closed. When the opening brake is completed, the volume of the buffer air cavity is increased, and air is supplied to the buffer air cavity through the air supply channel so as to be used in the next opening and closing operation.
Because the contact pressure spring is in flexible connection, the relative static between the moving contact and the contact spring pressure rod can not be always kept in the opening and closing processes, and even if the contact spring pressure rod moves completely according to the output characteristic of the operating mechanism through the transmission mechanism, the motion characteristic executed by the moving contact can not be completely matched with the originally designed motion characteristic. Therefore, a negative feedback mechanism needs to be introduced into the open-loop transmission chain to form a closed loop, so as to solve the problem that the motion characteristic output by the operating mechanism is not completely matched with the motion characteristic actually executed by the movable contact. The invention forms a negative feedback mechanism through the buffer air cavity, accurately controls the motion characteristic of the whole contact spring compression bar-moving contact system, optimizes the opening and closing motion characteristic of the moving contact, reduces the speed of the contact spring compression bar when the closing overtravel is carried out, and reduces the impact on the operating mechanism; after the electric arc is cut off, the opening speed is reduced, the overshoot of the moving contact is reduced, the damage and air leakage caused by the excessive compression of the corrugated pipe in advance are avoided, meanwhile, the impact on an operating mechanism is reduced, and the mechanical life of the vacuum arc extinguish chamber and the vacuum circuit breaker is effectively prolonged.
The vacuum circuit breaker of the present invention of embodiment 2 is different from embodiment 1 mainly in that: in this embodiment, the valve plate of the exhaust valve can be tightly attached to the front side of the air cavity sealing plate through the tension spring, and the guide bolt is omitted.
The vacuum circuit breaker of the present invention in embodiment 3 is different from embodiment 1 mainly in that: in this embodiment, the contact spring pressure lever of the over travel buffer device is a part of the insulating pull rod, and the contact spring pressure lever is directly hinged with the output crank arm of the operating mechanism when in use.
The vacuum circuit breaker of embodiment 4 of the present invention is different from embodiment 1 mainly in that: in this embodiment, the air cavity closing plate is provided with a damping channel instead of the exhaust valve.
The vacuum circuit breaker of the present invention in embodiment 5 is mainly different from embodiment 1 in that: the contact spring supporting cylinder can be not provided with an air cavity sealing plate, at the moment, the inner cavity of the cylinder body of the whole contact spring supporting cylinder and the piston form a buffer air cavity, and at the moment, the exhaust valve is arranged on the piston. At this time, a rear end sealing plate needs to be arranged at the rear end of the support cylinder, and the rear end sealing plate is in front-back stop fit with the piston, so that the contact spring pressing rod can pull the moving contact spring support cylinder backwards.
The vacuum circuit breaker of the present invention in embodiment 6 is different from embodiment 1 mainly in that: the exhaust valve is arranged on the piston and can be a one-way ball valve.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The vacuum circuit breaker comprises a vacuum arc extinguish chamber, wherein a moving contact and a fixed contact are arranged in the vacuum arc extinguish chamber, the moving contact and the fixed contact are arranged in front and back, the front end of the moving contact is a conductive contact end in conductive contact with the fixed contact, the rear end of the moving contact is a connecting end extending out of the arc extinguish chamber, the connecting end is connected with an over-travel buffer device used for driving the moving contact to act, the over-travel buffer device comprises a contact spring supporting cylinder, a contact spring and a contact spring pressure rod, the front end of the contact spring supporting cylinder is in transmission fit with the moving contact, the contact spring pressure rod extends into the contact spring supporting cylinder, and the contact spring is positioned between a cylinder body and the contact spring pressure rod; when the vacuum arc extinguish chamber is switched on, the contact spring pressing rod applies acting force to the moving contact through the compressed contact spring; the contact spring pressure lever is in front-back stop fit with the contact spring support cylinder, so that when the vacuum arc extinguish chamber is opened, the contact spring pressure lever drives the moving contact spring support cylinder to move backwards, and further drives the moving contact to move; the contact spring compression rod is characterized by comprising a rod body and a piston arranged on the rod body and positioned in a contact spring supporting cylinder, wherein a buffer air cavity is formed by the contact spring compression rod and the contact spring supporting cylinder in a surrounding mode.
2. The vacuum circuit breaker according to claim 1, wherein the wall of the buffer air chamber is provided with a damping passage for allowing air to enter and exit the buffer air chamber, or the wall of the buffer air chamber is provided with an exhaust valve for releasing air after the air in the buffer air chamber reaches a set pressure and an air supply passage for allowing air to enter the buffer air chamber.
3. The vacuum circuit breaker according to claim 2, wherein the contact spring support cylinder comprises a cylinder body and an air cavity sealing plate arranged in the cylinder body, the front end of the cylinder body is connected with the movable contact, the contact spring pressing rod penetrates through the air cavity sealing plate, the contact spring is arranged at the front side of the air cavity sealing plate, the piston and the air cavity sealing plate are arranged at intervals in the front and the back, and the buffer air cavity is arranged between the piston and the air cavity sealing plate.
4. The vacuum circuit breaker according to claim 3, wherein the contact spring pressing rod passes through the air cavity closing plate and is in clearance fit with the air cavity closing plate, the piston is in clearance fit with the contact spring supporting cylinder, and the clearance between the air cavity closing plate and the contact spring pressing plate and the clearance between the piston and the contact spring supporting cylinder form the air supply passage.
5. The vacuum interrupter of claim 3 wherein the vent valve is disposed on the air cavity closure plate.
6. The vacuum circuit breaker according to claim 5, wherein the air chamber sealing plate is provided with a valve port, and the exhaust valve comprises a valve plate disposed at the valve port, and a valve plate retaining spring for applying an elastic force to the valve plate, wherein the valve plate retaining spring is configured to deform the valve plate to open after the air in the buffer air chamber reaches a set pressure.
7. The vacuum interrupter of claim 6, wherein the air cavity sealing plate has guide bolts fixed thereon, and the valve plate retaining spring is fitted on the guide bolts.
8. The vacuum circuit breaker according to claim 7, wherein the head of the guide bolt is adapted to engage with the contact spring pressure bar to move the contact spring pressure bar backward.
9. The vacuum interrupter of claim 7, wherein the guide bolts are provided in plurality at regular intervals along a circumferential direction of the air cavity closing plate.
10. The vacuum circuit breaker according to any of claims 1-9, wherein the front cover of the contact spring support cylinder is provided with a cover hole for inserting the threaded connection column, and the threaded connection column is provided with a fixing nut for fixing the front cover and the movable contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111572628.5A CN114429881A (en) | 2021-12-21 | 2021-12-21 | Vacuum circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111572628.5A CN114429881A (en) | 2021-12-21 | 2021-12-21 | Vacuum circuit breaker |
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| CN114429881A true CN114429881A (en) | 2022-05-03 |
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| CN202111572628.5A Pending CN114429881A (en) | 2021-12-21 | 2021-12-21 | Vacuum circuit breaker |
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| CN207637700U (en) * | 2017-11-27 | 2018-07-20 | 北京中车赛德铁道电气科技有限公司 | Breaker spring mechanism |
| CN212648164U (en) * | 2020-03-08 | 2021-03-02 | 倪国兴 | Novel permanent magnet operating mechanism and vacuum circuit breaker |
| CN213660289U (en) * | 2020-12-07 | 2021-07-09 | 西安西电高压开关有限责任公司 | Contact holding device of high-reliability vacuum circuit breaker and vacuum circuit breaker |
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2021
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| CN207637702U (en) * | 2017-11-27 | 2018-07-20 | 北京中车赛德铁道电气科技有限公司 | A kind of breaker over-travel spring adjustment mechanism |
| CN207637700U (en) * | 2017-11-27 | 2018-07-20 | 北京中车赛德铁道电气科技有限公司 | Breaker spring mechanism |
| CN212648164U (en) * | 2020-03-08 | 2021-03-02 | 倪国兴 | Novel permanent magnet operating mechanism and vacuum circuit breaker |
| CN213660289U (en) * | 2020-12-07 | 2021-07-09 | 西安西电高压开关有限责任公司 | Contact holding device of high-reliability vacuum circuit breaker and vacuum circuit breaker |
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