CN109659207B - Resistance abrupt contact device and circuit breaker - Google Patents
Resistance abrupt contact device and circuit breaker Download PDFInfo
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- CN109659207B CN109659207B CN201910145861.1A CN201910145861A CN109659207B CN 109659207 B CN109659207 B CN 109659207B CN 201910145861 A CN201910145861 A CN 201910145861A CN 109659207 B CN109659207 B CN 109659207B
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- 230000008859 change Effects 0.000 claims abstract description 9
- 238000001179 sorption measurement Methods 0.000 claims description 23
- 230000035772 mutation Effects 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- 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
- H01H73/04—Contacts
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- 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
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Abstract
The invention discloses a resistance abrupt change type contact device and a circuit breaker, and relates to the technical field of circuit breakers. The resistance abrupt contact device comprises a disengaging piece, a resistance piece, a connecting rod, a first moving contact, a second moving contact, a first fixed contact and a second fixed contact. One side of the first fixed contact is connected with the second fixed contact through the resistor, the other side of the first fixed contact is propped against the first moving contact, the first moving contact is connected with the second moving contact through the connecting rod, the second moving contact is detachably connected with the second fixed contact, and the tripping piece is hinged with the connecting rod. Compared with the prior art, the resistance abrupt contact device provided by the invention has the advantages that as the tripping piece hinged with the connecting rod and the second moving contact detachably connected with the second fixed contact are adopted, the current passing through can be reduced and the power-off work can be completed in a resistance abrupt increase mode, so that the generation of electric arcs is prevented, and the resistance abrupt contact device is safe and reliable.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a resistance abrupt contact device and a circuit breaker.
Background
At present, power distribution is an extremely important link in the process of electricity generation, transportation and use, and miniature circuit breakers become an indispensable safety protection facility in a power distribution system. The miniature circuit breaker can generate electric arc when switching on and off, and because of limited volume, the breaking capacity of short circuit operation is lower (general 6 kA), and the miniature circuit breaker can only be used for distribution of terminal electric appliances. Many applications (e.g., substations, distribution substations, switching stations, etc.) expect that the short-circuit current is too great to be useful. The inventor researches and discovers that although the breaking capacity can be improved by increasing the opening distance between the two contacts, the volume of the miniature circuit breaker is synchronously increased, so that the miniature circuit breaker is not applicable to occasions with smaller space; the magnetic blow and air blow technology is utilized, the arc extinguishing is carried out by means of an arc extinguishing grid, and the limitation of the breaking capacity receptor volume is still difficult to improve.
In view of this, it is important to design and manufacture a resistance jump contact device and a circuit breaker, which avoid arcing, especially in the production of circuit breaking equipment.
Disclosure of Invention
The invention aims to provide a resistance mutation type contact device which occupies small space, reduces the passing current by using a resistance mutation increasing mode and completes the power-off work so as to prevent electric arcs, and is safe and reliable.
The invention further aims to provide the circuit breaker which is small in occupied space, safe, reliable, stable and practical, reduces the passing current in a resistance abrupt increase mode and completes the power-off work so as to prevent arc.
The invention is realized by adopting the following technical scheme.
The utility model provides a resistance abrupt change formula contact device, including the piece that takes off, resistance spare, the connecting rod, first moving contact, the second moving contact, first stationary contact and second stationary contact, one side of first stationary contact is connected with the second stationary contact through the resistance spare, the opposite side supports with first moving contact and holds, first moving contact passes through the connecting rod and is connected with the second moving contact, the second moving contact can dismantle with the second stationary contact and be connected, the tripping part is articulated with the connecting rod, the tripping part can drive the connecting rod motion when keeping away from first stationary contact, so that first moving contact breaks away from first stationary contact.
Further, the sum of the resistances of the resistance piece and the second fixed contact is larger than the sum of the resistances of the first movable contact and the connecting rod.
Further, the tripping piece comprises a first rotating shaft and a second rotating shaft, the first rotating shaft is fixedly connected with the second rotating shaft and is arranged at an included angle, and the second rotating shaft is hinged with the connecting rod.
Further, one end of the connecting rod is welded with the first moving contact, the other end of the connecting rod is welded with the second moving contact, and the second rotating shaft is hinged to one side, close to the first moving contact, of the connecting rod.
Further, the second fixed contact is provided with an arc surface, the shape of the second movable contact is matched with that of the arc surface, the second movable contact is attached to the concave surface of the arc surface, and the second movable contact can rotate relative to the second fixed contact when the first movable contact is far away from the first fixed contact.
Further, be provided with first adsorption part in the arcwall face, the second moving contact is provided with second adsorption part, and first adsorption part is connected with second adsorption part magnetism.
Further, the resistance abrupt contact device further comprises a stop piece, the stop piece is arranged at intervals with the first moving contact and corresponds to the position of the first moving contact, and the stop piece can limit the first moving contact when the first moving contact moves to a preset position, so that the tripping piece drives the second moving contact to move through the connecting rod and is separated from the second fixed contact.
Further, the stop piece selectively abuts against the first moving contact, the stop piece is provided with a third adsorption part, the first moving contact is provided with a fourth adsorption part, and the third adsorption part is magnetically connected with the fourth adsorption part.
Further, the resistance mutation type contact device further comprises a conductive piece, wherein the conductive piece is connected with the first fixed contact and is used for being connected with an external power supply or an electric appliance.
The utility model provides a circuit breaker, including foretell resistance abrupt change formula contact device, this resistance abrupt change formula contact device includes the trip piece, the resistance piece, the connecting rod, first moving contact, the second moving contact, first stationary contact and second stationary contact, one side of first stationary contact is connected with the second stationary contact through the resistance piece, the opposite side supports with first moving contact, first moving contact passes through the connecting rod and is connected with the second moving contact, the second moving contact can dismantle with the second stationary contact and be connected, the trip piece articulates with the connecting rod, the trip piece can drive the connecting rod motion when keeping away from first stationary contact, so that first moving contact breaks away from first stationary contact.
The resistance mutation type contact device and the circuit breaker provided by the invention have the following beneficial effects:
the invention provides a resistance mutation type contact device which comprises a disengaging piece, a resistance piece, a connecting rod, a first moving contact, a second moving contact, a first fixed contact and a second fixed contact, wherein one side of the first fixed contact is connected with the second fixed contact through the resistance piece, the other side of the first fixed contact is propped against the first moving contact, the first moving contact is connected with the second moving contact through the connecting rod, the second moving contact is detachably connected with the second fixed contact, a disengaging piece is hinged with the connecting rod, and the disengaging piece can drive the connecting rod to move when being far away from the first fixed contact so as to enable the first moving contact to be disengaged from the first fixed contact. Compared with the prior art, the resistance abrupt contact device provided by the invention has the advantages that as the tripping piece hinged with the connecting rod and the second moving contact detachably connected with the second fixed contact are adopted, the current passing through can be reduced and the power-off work can be completed in a resistance abrupt increase mode, so that the generation of electric arcs is prevented, and the resistance abrupt contact device is safe and reliable.
The circuit breaker provided by the invention comprises the resistance mutation type contact device, the occupied space is small, the current passing through the circuit breaker is reduced by utilizing the resistance mutation increasing mode, and the power-off work is completed, so that the generation of electric arcs is prevented, and the circuit breaker is safe, reliable, stable and practical.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a circuit breaker according to a first embodiment of the present invention in a normal state;
fig. 2 is a schematic structural view of a resistance mutation type contact device according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a circuit breaker according to a first embodiment of the present invention during a circuit breaking process;
fig. 4 is a schematic structural diagram of a circuit breaker according to a first embodiment of the present invention when the circuit breaker is about to complete the circuit breaking;
fig. 5 is a schematic structural diagram of a circuit breaker according to a first embodiment of the present invention after the circuit breaking is completed.
Icon: 10-a circuit breaker; 100-resistance abrupt contact means; 110-a conductive member; 130-release fastener; 131-a first rotation shaft; 132-a second spindle; 140-resistor; 150-a stopper; 151-a third adsorption section; 160-connecting rods; 170-a first moving contact; 171-a fourth adsorption section; 180-a second moving contact; 181-a second adsorption section; 190-a first stationary contact; 191-a second stationary contact; 192-arced surface; 193-first adsorbent section; 200-tripping switch; 300-a housing; 400-a first connection terminal; 500-second connection terminals; 600-closing spanner; 700-trip mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "inner", "outer", "upper", "lower", "horizontal", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.
Examples
Referring to fig. 1, an embodiment of the present invention provides a circuit breaker 10 for automatically cutting off a circuit when a fault such as serious overload or short circuit occurs, so as to ensure electrical safety. The electric arc protection device is small in occupied space, reduces the passing current by utilizing a resistance mutation increasing mode and completes power-off work so as to prevent electric arcs, and is safe, reliable, stable and practical.
The circuit breaker 10 includes a resistance abrupt contact device 100, a trip switch 200, a housing 300, a first connection terminal 400, a second connection terminal 500, a closing wrench 600, and a trip mechanism 700. The resistance mutation type contact device 100, the trip switch 200, the first connection terminal 400, the second connection terminal 500, and the trip mechanism 700 are all installed in the housing 300 to be shielded and protected by the housing 300. The first connection terminal 400 and the second connection terminal 500 are relatively installed at both ends of the housing 300, and the resistance-mutation type contact device 100 and the trip switch 200 are connected to the first connection terminal 400, and the first connection terminal 400 is connected to an external power source or an electric appliance. One end of the second connection terminal 500 is connected to the abrupt resistance change contact device 100, and the other end is connected to an electric appliance or an external power supply.
The resistance abrupt contact device 100 is connected with the tripping mechanism 700, and the tripping switch 200 can push the tripping mechanism 700 to drive the tripping mechanism 700 to rotate when a circuit flows excessively, so that the resistance abrupt contact device 100 is separated, the circuit is disconnected, and in the process, the tripping mechanism 700 pushes the tripping switch 200 to reset the tripping switch 200 to wait for the next closing. The closing wrench 600 is coupled to the trip mechanism 700 and is rotatable with respect to the housing 300. The trip mechanism 700 rotates to drive the closing wrench 600 to rotate, namely trip occurs, if the circuit needs to be communicated again, a user can rotate the closing wrench 600 through external force to drive the trip mechanism 700 to rotate, so that the resistance abrupt change type contact device 100 is closed, and the circuit is electrified.
In this embodiment, the first connection terminal 400 is an input terminal, the first connection terminal 400 is connected to an external power source through a wire, the second connection terminal 500 is an output terminal, and the second connection terminal 500 is connected to an electrical appliance through a wire.
Referring to fig. 2, the abrupt resistance contact device 100 includes a conductive member 110, a trip member 130, a resistive member 140, a stop member 150, a connecting rod 160, a first moving contact 170, a second moving contact 180, a first fixed contact 190, and a second fixed contact 191. The first stationary contact 190 is connected with the trip switch 200 through the conductive member 110 to fix the relative position of the first stationary contact 190 and the trip switch 200, and the first stationary contact 190 is connected with the first connection terminal 400 through the conductive member 110 to be conducted with an external power source. The second movable contact 180 is connected with the second connection terminal 500 to be conducted with an electric appliance. One side of the first fixed contact 190 is connected with the second fixed contact 191 through the resistor 140, the other side is propped against the first moving contact 170, the first moving contact 170 is connected with the second moving contact 180 through the connecting rod 160, and the second moving contact 180 is detachably connected with the second fixed contact 191. The trip piece 130 is connected with the trip mechanism 700, the trip piece 130 can rotate under the driving of the trip mechanism 700, so that the trip piece 130 is close to or far away from the first fixed contact 190, the trip piece 130 is hinged with the connecting rod 160, and the trip piece 130 can drive the connecting rod 160 to move when far away from the first fixed contact 190, so that the first movable contact 170 is separated from the first fixed contact 190. The stop piece 150 is arranged at intervals with the first moving contact 170, and corresponds to the position of the first moving contact 170, and the stop piece 150 can limit the first moving contact 170 when the first moving contact 170 moves to a preset position, so that the disengaging piece 130 drives the second moving contact 180 to move through the connecting rod 160 and is separated from the second fixed contact 191, and the first fixed contact 190 is disconnected from the second moving contact 180, so that the electrical appliance is powered off.
It should be noted that, one side of the first fixed contact 190 is connected to the second movable contact 180 through the first movable contact 170 and the connecting rod 160 to form a first conductive path (not shown), and the other side of the first fixed contact 190 is connected to the second movable contact 180 through the resistor 140 and the second fixed contact 191 to form a second conductive path (not shown). Specifically, the sum of the resistances of the resistive member 140 and the second stationary contact 191 is greater than the sum of the resistances of the first moving contact 170 and the connecting rod 160, i.e., the resistance of the second conductive path is greater than the resistance of the first conductive path, and the current through the second conductive path is less than the current through the first conductive path. In this embodiment, the resistances of the first moving contact 170 and the connecting rod 160 are small and negligible, and the current passing through the first conductive path will not change; the resistance of the resistive member 140 is extremely high and the current through the second conductive path is extremely low, approaching zero.
It should be noted that, when the circuit breaker 10 is in a normal state, the first fixed contact 190 abuts against the first moving contact 170, the first conductive path and the second conductive path are connected in parallel, and the first fixed contact 190 is connected with the second moving contact 180 through the parallel circuit, in this process, since the resistance of the first conductive path is small and negligible, the resistance of the parallel circuit is small, and the loss generated by the current passing through the parallel circuit is small and negligible, so that the electrical appliance can operate normally.
When the circuit breaker 10 starts to break, the trip piece 130 is far away from the first fixed contact 190 under the action of the trip mechanism 700 and drives the connecting rod 160 to move, in the process, the second moving contact 180 at one end of the connecting rod 160 is detachably connected with the second fixed contact 191, so that the second moving contact 180 keeps a fitting state with the second fixed contact 191 and rotates relative to the second fixed contact 191, the first moving contact 170 at the other end of the connecting rod 160 is far away from the first fixed contact 190, the first moving contact 170 is separated from the first fixed contact 190, the first conductive path is disconnected, the first fixed contact 190 is connected with the second moving contact 180 in series through the second conductive path, and therefore an external power supply is conducted with an electric appliance, at the moment, the resistance of the resistance piece 140 is extremely large, the current passing through the second conductive path is extremely small and is close to zero; then, the trip piece 130 continues to be far away from the first fixed contact 190 under the action of the trip mechanism 700, and drives the first moving contact 170 to move through the connecting rod 160, when the first moving contact 170 moves to a preset position, the stop piece 150 limits the first moving contact 170, namely limits one end of the connecting rod 160, at the moment, the connecting rod 160 continues to move under the action of the trip piece 130, drives the other end of the connecting rod 160 to move, namely drives the second moving contact 180 to move, so that the second moving contact 180 is separated from the second fixed contact 191, and the second conducting path is disconnected, the first fixed contact 190 is disconnected from the second moving contact 180, so that power failure is realized, and in the process, an electric arc cannot be generated due to the fact that the current in a circuit is close to zero, and the trip mechanism is safe and reliable.
Notably, the trip 130 includes a first shaft 131 and a second shaft 132. The trip mechanism 700 is fixedly connected with the first rotating shaft 131 to drive the first rotating shaft 131 to rotate. The first rotating shaft 131 is fixedly connected with the second rotating shaft 132 and is arranged at an included angle, and the first rotating shaft 131 can drive the second rotating shaft to rotate. The second rotation shaft 132 is hinged to the connection rod 160, and the connection rod 160 can rotate with respect to the second rotation shaft 132. The first rotation shaft 131, the second rotation shaft 132 and the connecting rod 160 are all located on the same plane, so that the whole movement process is stable and reliable.
One end of the connecting rod 160 is welded to the first moving contact 170, and the other end is welded to the second moving contact 180, so as to improve the connection strength. The second rotating shaft 132 is hinged to one side of the connecting rod 160 near the first moving contact 170, that is, the position where the connecting rod 160 is hinged to the second rotating shaft 132 is a hinge point, and the distance between the hinge point and the first moving contact 170 is smaller than the distance between the hinge point and the second moving contact 180, so that the second rotating shaft 132 will pull the first moving contact 170 away from the first fixed contact 190 when driving the connecting rod 160 to rotate, and the second moving contact 180 rotates relative to the second fixed contact 191.
Specifically, the second fixed contact 191 is provided with an arc surface 192, the shape of the second moving contact 180 is matched with the shape of the arc surface 192, the second moving contact 180 is attached to a concave surface of the arc surface 192, and the second moving contact 180 can rotate relative to the second fixed contact 191 when the first moving contact 170 is far away from the first fixed contact 190, so that conduction between the second fixed contact 191 and the second moving contact 180 is ensured, and conduction of a second conductive path is ensured. In this embodiment, a first adsorption portion 193 is disposed in the arc surface 192, the second moving contact 180 is disposed with a second adsorption portion 181, the first adsorption portion 193 is magnetically connected with the second adsorption portion 181 to adsorb the second moving contact 180 on the second fixed contact 191, and the second moving contact 180 can be separated from the second fixed contact 191 under the action of an external force greater than the magnetic attraction.
It should be noted that the stopper 150 is fixedly mounted in the housing 300 and selectively abuts against the first moving contact 170. When the first moving contact 170 moves to a preset position, the stopper 150 collides with the first moving contact 170 to define the position of the first moving contact 170, preventing the first moving contact 170 from continuing to rotate with the connection rod 160. The stopper 150 is provided with a third adsorption part 151, the first moving contact 170 is provided with a fourth adsorption part 171, the third adsorption part 151 and the fourth adsorption part 171 are magnetically connected to adsorb the first moving contact 170 on the stopper 150, and the first moving contact 170 can be separated from the stopper 150 when being closed and reset under the driving of the trip 130.
Referring to fig. 1, 3, 4 and 5, it should be noted that when the current of the circuit does not exceed the preset value, the first stationary contact 190 abuts against the first moving contact 170, the first conductive path and the second conductive path are connected in parallel, the current output from the external power source passes through the parallel circuit and is delivered to the electrical appliance, in this process, the resistance of the parallel circuit is small and is close to zero, the loss generated by the current passing through the parallel circuit is small and can be ignored, so that the electrical appliance can operate normally.
When the circuit current exceeds a preset value, the trip switch 200 pushes the trip mechanism 700 to rotate, the connecting rod 160 is driven by the trip piece 130 to be far away from the first fixed contact 190, in the process, the second movable contact 180 is taken as a fulcrum, the connecting rod 160 rotates, the first movable contact 170 is far away from the first fixed contact 190, the second movable contact 180 is attached to the second fixed contact 191 and rotates relative to the second fixed contact 191, the parallel circuit becomes a series circuit, the current output from an external power supply passes through a second conductive path and is conveyed into an electrical appliance, in the process, the resistance of the resistance piece 140 is extremely high, and the current passing through the second conductive path is close to zero; then the connecting rod 160 is driven by the disengaging piece 130 to be continuously far away from the first fixed contact 190, the first moving contact 170 cannot be displaced under the action of the stop piece 150, in the process, the first moving contact 170 is taken as a fulcrum, the connecting rod 160 rotates, the second moving contact 180 is separated from the second fixed contact 191, power failure is realized, and because the current in the circuit is close to zero at the moment, no electric arc is generated, and the circuit is safe and reliable.
During closing, a user rotates the closing wrench 600 by external force to drive the tripping mechanism 700 to rotate, so that the connecting rod 160 is driven to rotate by the tripping piece 130, the first moving contact 170 is pushed to rotate and separate from the stop piece 150 until the first moving contact 190 abuts against the second moving contact 180, and in the process, the second moving contact 180 rotates until the second moving contact 191 abuts against the second moving contact 191 and is adsorbed on the second moving contact 191, so that resetting is completed.
The resistance abrupt change type contact device 100 provided by the embodiment of the invention comprises a disengaging piece 130, a resistance piece 140, a connecting rod 160, a first moving contact 170, a second moving contact 180, a first fixed contact 190 and a second fixed contact 191, wherein one side of the first fixed contact 190 is connected with the second fixed contact 191 through the resistance piece 140, the other side of the first fixed contact 190 is propped against the first moving contact 170, the first moving contact 170 is connected with the second moving contact 180 through the connecting rod 160, the second moving contact 180 is detachably connected with the second fixed contact 191, the disengaging piece 130 is hinged with the connecting rod 160, and the disengaging piece 130 can drive the connecting rod 160 to move when being far away from the first fixed contact 190 so as to enable the first moving contact 170 to be separated from the first fixed contact 190. Compared with the prior art, the resistance mutation type contact device 100 provided by the invention adopts the disengaging piece 130 hinged with the connecting rod 160 and the second movable contact 180 detachably connected with the second fixed contact 191, so that the passing current can be reduced and the power-off work can be completed in a resistance mutation increasing mode, the generation of electric arcs is prevented, the safety and the reliability are realized, the circuit breaker 10 is stable and practical, and the user experience is good.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The resistance abrupt change type contact device is characterized by comprising a disengaging piece, a resistance piece, a connecting rod, a first moving contact, a second moving contact, a first fixed contact and a second fixed contact, wherein one side of the first fixed contact is connected with the second fixed contact through the resistance piece, the other side of the first fixed contact is propped against the first moving contact, the first moving contact is connected with the second moving contact through the connecting rod, the second moving contact is detachably connected with the second fixed contact, the disengaging piece is hinged with the connecting rod, and the disengaging piece can drive the connecting rod to move when being far away from the first fixed contact so as to enable the first moving contact to be disengaged from the first fixed contact;
the tripping piece comprises a first rotating shaft and a second rotating shaft, the first rotating shaft is fixedly connected with the second rotating shaft and is arranged in an included angle, and the second rotating shaft is hinged with the connecting rod;
one end of the connecting rod is welded with the first moving contact, the other end of the connecting rod is welded with the second moving contact, and the second rotating shaft is hinged to one side, close to the first moving contact, of the connecting rod;
the second fixed contact is provided with an arc surface, the shape of the second movable contact is matched with that of the arc surface, the second movable contact is attached to the concave surface of the arc surface, and the second movable contact can rotate relative to the second fixed contact when the first movable contact is far away from the first fixed contact.
2. The resistance mutation type contact device according to claim 1, wherein a sum of resistances of the resistance member and the second stationary contact is larger than a sum of resistances of the first movable contact and the connecting rod.
3. The resistance mutation type contact device according to claim 1, wherein a first adsorption portion is provided in the arc surface, the second movable contact is provided with a second adsorption portion, and the first adsorption portion is magnetically connected with the second adsorption portion.
4. The resistance abrupt contact device according to claim 1, further comprising a stopper, wherein the stopper is disposed at a distance from the first moving contact and corresponds to a position of the first moving contact, and the stopper is capable of limiting the first moving contact when the first moving contact moves to a preset position, so that the trip member drives the second moving contact to move through the connecting rod and is separated from the second fixed contact.
5. The resistance mutation type contact device according to claim 4, wherein the stopper is selectively abutted against the first moving contact, the stopper is provided with a third adsorbing portion, the first moving contact is provided with a fourth adsorbing portion, and the third adsorbing portion and the fourth adsorbing portion are magnetically connected.
6. The resistance abrupt contact device of claim 1, further comprising a conductive member connected to the first stationary contact, the conductive member being configured to be connected to an external power source or an electrical appliance.
7. A circuit breaker comprising a resistance mutation type contact arrangement according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910145861.1A CN109659207B (en) | 2019-02-27 | 2019-02-27 | Resistance abrupt contact device and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910145861.1A CN109659207B (en) | 2019-02-27 | 2019-02-27 | Resistance abrupt contact device and circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109659207A CN109659207A (en) | 2019-04-19 |
| CN109659207B true CN109659207B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910145861.1A Active CN109659207B (en) | 2019-02-27 | 2019-02-27 | Resistance abrupt contact device and circuit breaker |
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| CN (1) | CN109659207B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113725047A (en) * | 2020-05-26 | 2021-11-30 | 国网福建省电力有限公司 | Static contact and switch device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098485A (en) * | 2016-08-04 | 2016-11-09 | 厦门大恒科技有限公司 | Circuit breaker |
| CN205911269U (en) * | 2016-08-04 | 2017-01-25 | 厦门大恒科技有限公司 | Circuit breaker |
| CN206602082U (en) * | 2017-04-11 | 2017-10-31 | 厦门大恒科技有限公司 | Miniature circuit breaker and circuit protection device |
| CN209298053U (en) * | 2019-02-27 | 2019-08-23 | 厦门大恒科技有限公司 | Resistance mutation type contact device and circuit breaker |
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2019
- 2019-02-27 CN CN201910145861.1A patent/CN109659207B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106098485A (en) * | 2016-08-04 | 2016-11-09 | 厦门大恒科技有限公司 | Circuit breaker |
| CN205911269U (en) * | 2016-08-04 | 2017-01-25 | 厦门大恒科技有限公司 | Circuit breaker |
| CN206602082U (en) * | 2017-04-11 | 2017-10-31 | 厦门大恒科技有限公司 | Miniature circuit breaker and circuit protection device |
| CN209298053U (en) * | 2019-02-27 | 2019-08-23 | 厦门大恒科技有限公司 | Resistance mutation type contact device and circuit breaker |
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| CN109659207A (en) | 2019-04-19 |
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