CN109087828B - Novel contactor structure with excitation cutting-off function - Google Patents
Novel contactor structure with excitation cutting-off function Download PDFInfo
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- CN109087828B CN109087828B CN201811193962.8A CN201811193962A CN109087828B CN 109087828 B CN109087828 B CN 109087828B CN 201811193962 A CN201811193962 A CN 201811193962A CN 109087828 B CN109087828 B CN 109087828B
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- 230000005284 excitation Effects 0.000 title claims abstract description 92
- 238000004146 energy storage Methods 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000009471 action Effects 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000003068 static effect Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 26
- 238000010586 diagram Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000000576 supplementary effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
- H01H50/641—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
- H01H50/68—Driving arrangements between movable part of magnetic circuit and contact with snap action
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The novel contactor structure with the excitation cutting-off function comprises an insulating shell, wherein an electromagnet, a movable iron core and a movable contact are arranged in the insulating shell, a fixed contact is arranged on the insulating shell above the movable contact, a cavity above the movable contact is formed in the insulating shell between the fixed contacts, and an excitation cutting-off energy storage unit and an insulating excitation cutting-off execution unit are sequentially arranged in the cavity from top to bottom; when the excitation cut-off execution unit acts under the drive of the excitation cut-off energy storage unit, the excitation cut-off execution unit can press the moving contact to break away from contact with the fixed contact to disconnect the main circuit. When the contactor fails to be disconnected due to unexpected faults, the movable contact and the fixed contact of the contactor can be forced to be separated from contact, and a main circuit is disconnected; the disconnection response speed is high.
Description
Technical Field
The invention belongs to the field of electric power, in particular to a structure of a contactor for electric power, electric automobiles and the like, and is applicable to both alternating current and direct current.
Background
The contactor is a control switch element with isolation function, and the control device for controlling the switch state of the main loop by utilizing the attraction force generated between the electromagnet and the armature (moving core) can realize the isolation control of the low-current low-voltage loop and the high-current high-voltage loop. The rated long-time energizing current of the contactor applied to the high-voltage high-current protection of the electric vehicle at present is generally not more than 400A, and the breaking current is generally not more than 3000A.
Referring to fig. 1, a control signal input end 101 and a control signal output end 102 are respectively connected with an electromagnet of the contactor; an on-off switch is arranged between the main circuit input terminal 103 and the main circuit output terminal 104, and the on-off of the on-off switch is determined by a moving contact of the contactor. The control signal gives a control electric signal to the electromagnet, so that the electromagnet acts to generate electromagnetic force to drive the moving contact to move to the position of the fixed contact, and the disconnected circuit between the main circuit input end 103 and the main circuit output end 104 is communicated; when the circuit is disconnected, the movable contact is classified to an initial non-contact position under the action of electromagnetic force (or a return spring), so that the connection between the main circuit input end 103 and the main circuit output end 104 is disconnected again.
Typical structure of the prior art double break contactor referring to fig. 2, the input terminal contact and post 001 and the output terminal contact and post 002 and the insulation upper housing 003 constitute a top cover assembly. The moving contact, the conductive plate 004 and the moving core 005 form a whole, and are arranged in an electromagnet cavity 006, and the electromagnet cavity is arranged in an insulating lower shell 007. The action principle is as follows: when the electromagnetic switch is in suction, the moving iron core and the moving contact assembly move upwards under the action of the electromagnet, the moving contact is connected with two contacts on the top cover assembly, and the input and output end circuit is conducted. When the movable iron core and the movable contact assembly are disconnected, the movable iron core and the movable contact assembly move downwards under the action of an electromagnet (or a reset spring) to separate the movable contact from the two contacts on the top cover assembly.
The contactor also has the following defects at present: the large current is difficult to break, and when the fault current exceeds the rated current by more than a factor, the large current cannot be broken, so that the circuit cannot be broken due to contact sintering, and explosion accidents or other safety accidents can be caused to the contactor and other parts of the loop; the action time is about 10ms, the on-load breaking time is more than 10ms, and because the breaking time is longer, a plurality of fault currents can still damage the lower-level devices or the contactor; in the off state, there is a possibility of abnormal suction due to vibration, electromagnetic interference, or the like, so that the contactor cannot be used as a safety device for reliably opening the circuit.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a novel contactor structure which has the function of independently and forcedly cutting off a circuit loop besides the traditional function of a contactor; and the breaking current is larger, and the breaking speed is faster.
In order to solve the technical problems, the technical scheme provided by the invention is that the novel contactor structure with the excitation cutting function comprises an insulating shell, an electromagnet is arranged in the insulating shell, a moving iron core is arranged in a cavity in the electromagnet, support rods are connected to the moving iron core, moving contacts are positioned on two sides of the periphery of the support rod body, fixed contacts which are correspondingly arranged at intervals are arranged on the insulating shell above the moving contacts, a cavity is formed in the insulating shell between the fixed contacts, an excitation cutting energy storage unit and an insulating excitation cutting execution unit are sequentially arranged in the cavity from top to bottom, the excitation cutting energy storage unit is a gas generator, the excitation cutting execution unit is a piston or a sliding block, and the excitation cutting execution unit is positioned above the moving contacts;
When the excitation cutting-off energy storage unit receives the electric signal to trigger action, high-pressure gas is released to serve as driving force to drive the excitation cutting-off execution unit to displace, the movable contact is pressed against displacement, the movable contact is separated from conductive contact with the fixed contact, and the main circuit is disconnected.
An auxiliary arc extinguishing device is arranged on one side of the movable contact and one side of the fixed contact; two ends of the auxiliary arc extinguishing device are respectively connected with a fixed contact serving as an input end and a fixed contact serving as an output end through an arc extinguishing circuit, and a switch fracture for disconnecting the arc extinguishing circuit is arranged on the arc extinguishing circuit; when the excitation cut-off energy storage unit receives an electric signal to trigger action, high-pressure gas is released to serve as driving force to drive the excitation cut-off execution unit to displace, the switch fracture is conducted firstly, and therefore the arc extinguishing circuit is conducted; and then driving the excitation cut-off execution unit to separate the moving contact from the static contact to disconnect the main circuit, and then disconnecting the arc extinguishing circuit by the auxiliary arc extinguishing device to extinguish arc.
The movable iron core is connected with a supporting rod, and the two sides of the periphery of the upper end of the supporting rod are provided with movable contacts; the excitation cut-off execution unit is a piston or a sliding block.
A guide sleeve is arranged on the insulating shell above the movable iron core, and the movable iron core is connected with the insulating shell through a spring; the support rod is located in the guide sleeve.
The periphery fixed cover in bracing piece upper end is equipped with the spring, the moving contact is connected the spring upper end to through the pressure strip pressure spacing fixed above the moving contact.
The supporting rod and the movable iron core are respectively provided with a through hole; the switch fracture of the arc extinguishing circuit is positioned below the through hole; the excitation cutting-off execution unit is a piston with a rod body, and the lower end of the piston rod body is positioned in the switch fracture after passing through the through hole; a conductive structure is arranged on the periphery of the piston rod above the switch fracture; when the piston moves downwards, the conducting structure on the piston rod moves downwards to enter the switch fracture, after the arc extinguishing circuit is conducted, the piston moves downwards, the supporting rod is pressed to drive the moving contact to break away from the contact with the fixed contact to cut off the main circuit, then the auxiliary arc extinguishing device is fused, and the arc extinguishing circuit is disconnected to extinguish arc.
The auxiliary arc extinguishing device, the insulating shell and the outside of the fracture are coated with an insulating shell.
A circuit board is arranged between the insulating shell and the insulating shell, and the circuit board is connected with the excitation cut-off energy storage unit.
The fracture is positioned at the outer side of the insulating shell at one side of the excitation cutting execution unit, the impact end of the excitation cutting execution unit is provided with an inclined plane, a connecting rod is arranged between the fracture and the excitation cutting execution unit, one end of the connecting rod is abutted against the inclined plane of the impact end of the excitation cutting execution unit, the other end of the connecting rod is positioned in the fracture, and a conductive structure is arranged on the connecting rod positioned at the outer side of the fracture; when the cut-off execution unit is excited to move downwards, the impact end inclined plane of the cut-off execution unit extrudes the connecting rod to displace outwards, so that the conductive structure on the connecting rod is forced to enter the switch fracture, and the arc extinguishing circuit is conducted.
The excitation cutting-off execution unit is a piston, and the impact end of the piston is in a conical, frustum-shaped, round or trapezoid structure.
The insulating shell is provided with a guide through hole, and the connecting rod is positioned in the guide through hole.
The excitation cut-off energy storage unit is a gas generator.
And a sealing film is arranged at the lower end of the cavity where the excitation cutting-off energy storage unit and the excitation cutting-off execution unit are positioned.
The connecting wire of the arc extinguishing circuit is a conductive plate; the conductive plate end at the fracture is a conductive elastic sheet.
The auxiliary arc extinguishing device is a fuse with an arc extinguishing medium filled inside.
A stopping mechanism is arranged on the excitation cutting execution unit, and when the excitation cutting execution unit moves to a designated position, the stopping mechanism can assist the excitation cutting execution unit to stop moving and prevent reversing.
On the premise of keeping the original functions of the contactor, the invention improves the safety of products by adding the excitation cut-off module and the auxiliary arc extinguishing circuit module. The arc extinguishing function and the excitation cutting function are controlled by independent circuits and are parallel to the conventional control circuit of the contactor. When the safety function controlled by the electric signal is started, the excitation cutting-off module moves rapidly under the action of physical or chemical energy, the arc extinguishing circuit switch is pushed to be closed, and then the moving contact and the fixed contact of the contactor are forced to be separated, so that the opening function of the main circuit is realized. Meanwhile, with the help of an arc extinguishing fuse in the auxiliary arc extinguishing circuit, arc extinguishing actions are completed. Meanwhile, the excitation cutting-off module has the backstop capability, so that the moving contact and the fixed contact of the contactor are separated and cannot be contacted again.
The original conventional function and the newly added safety function of the contactor are controlled and driven by electric signals, the trigger signals can be provided by the outside or can be controlled by an integrated control board, and the actions of the trigger signals are controlled by the following modes: 1. and the safety device is linked, for example, when the safety air bag acts, the loop is actively disconnected by the simultaneous action. Or when other states possibly causing safety accidents occur, signals are sent out, and meanwhile, the loop is actively opened by action. 2. And detecting loop linkage, if the current, temperature, distance, acceleration, humidity and the like reach a certain threshold value, sending out a command, and actively disconnecting the loop. 3. The remote control equipment links, remote instructions act, and the loop is actively disconnected. 4. When the contactor can not break the current, the excitation cutting-off module is used as a supplementary action to actively cut off the loop.
The invention has the following advantages:
1. adding additional excitation turns off the function of the circuit loop.
2. The auxiliary arc-extinguishing circuit is added, so that the capacity of the contactor to extinguish the high-current fault is provided.
3. The physical or chemical energy is used for exciting the action, the action speed is faster when the excitation is cut off, and the action time can be not more than 2ms.
4. The excitation cut-off function provides physical isolation, keeps the main loop reliably disconnected, and can be used as a safety protection element.
5. The application range of the contactor product is increased.
6. The excitation cut-off function is controlled by an independent circuit and is controlled in parallel with the contactor control circuit.
Drawings
Fig. 1 is a schematic diagram of the operation of a conventional contactor.
Fig. 2 is a schematic cross-sectional view of a conventional two-terminal contactor.
Fig. 3 is a schematic diagram of the operation of the present invention with the addition of an excitation cut-off function.
Fig. 4 is a schematic diagram of the operation of the present invention with the addition of an excitation cut-off function and an arc extinguishing function.
Fig. 5 is a schematic view of the longitudinal sectional structure of the exciting switch of the present invention when the exciting switch is not operated, the arc extinguishing circuit is opened, and the contactor is not in contact.
Fig. 6 is a schematic diagram of a longitudinal sectional structure of the exciting switch of the invention when the exciting switch is not operated, the arc extinguishing circuit is opened, and the contactor contacts are normally operated.
Fig. 7 is a schematic view of a longitudinal sectional structure of the contactor when the contactor contacts when the exciting switch Guan Gang is operated and the arc extinguishing circuit is not connected.
Fig. 8 is a schematic diagram of a front view and longitudinal sectional structure of the contactor when the movable contact and the static contact are forcedly isolated, wherein the exciting switch of the invention is in place and communicated with an arc extinguishing circuit.
Fig. 9 is a schematic view of the appearance of another structure of the present invention.
Fig. 10 is a schematic top view of the fig. 9 structure.
Fig. 11, a schematic side cross-sectional view of the fig. 9 structure.
Fig. 12, a schematic elevational cross-sectional view of the fig. 9 structure.
Fig. 13 is a schematic view of the external appearance structure of fig. 9 after the forced cutting operation.
FIG. 14 is a schematic plan view of the structure of FIG. 9 after the forced cutting operation
FIG. 15 is a schematic view of the structure of FIG. 9 in side elevation and longitudinal section after forced cutting action
FIG. 16 is a schematic front longitudinal sectional view of FIG. 9 after a forced cutting action
Detailed Description
The above technical solution, the preferred embodiments are now described in detail with reference to the drawings.
First, the operation principle will be described. The invention adds a contactor schematic diagram of an excitation scheme: referring to fig. 3, an excitation switch 106 capable of forcibly cutting off the contact between a movable contact and a fixed contact of a contactor is added on a conventional contactor, and the excitation switch module 106 is connected with an excitation cut-off module signal input 107 and an excitation cut-off module signal output 108 respectively to receive an excitation cut-off signal. When the traditional contactor does not act to cut off except the generation, the excitation switch module acts after receiving an excitation cutting-off signal, the connection between the moving contact and the fixed contact of the contactor is forcibly cut off, the moving contact and the fixed contact are separated from contact, and a circuit is disconnected to implement protection work. When the current is large and the generated arc is large, an auxiliary arc extinguishing mechanism can be added to extinguish the arc. The principle of operation is that with reference to fig. 4, an arc extinguishing circuit 105 is connected in parallel between the main circuit input 103 and the main circuit output 104 to extinguish an arc generated when the circuit is switched off. In a normal working state, the arc extinguishing circuit is disconnected, the excitation cut-off switch module does not act, and only the contactor works normally; when an accident happens, the cut-off switch module is excited to act, the arc extinguishing circuit is conducted by the guide, then the contact between the moving contact and the static contact is forcedly isolated, the main circuit is cut off, and then arc extinguishing is carried out through the auxiliary arc extinguishing device.
The invention adds an excitation cut-off module and an auxiliary arc extinguishing circuit on the basis of the traditional contactor, and mainly aims to realize the following 5 purposes: 1. in addition to the electromagnetic force action switch function (the original function of the relay), an additional function of exciting and cutting off a circuit loop is added; 2. the arc extinguishing fuse is used for effectively extinguishing arc when the circuit is matched with the circuit change-over switch to excite and cut off, so that arc damage is avoided; 3. the excitation cut-off function can cut off larger current; 4. the action speed is faster when the excitation is cut off; 5. the excitation cut-off function provides physical isolation, keeps reliable cut-off and can be used as a safety protection element.
According to the above-described operation principle, a specific contactor structure to which the excitation cut-off function is added is as follows. Referring to fig. 5 and 6, an electromagnet 204 is disposed at the lower part in the inner housing, a chamber is formed in the electromagnet, a moving iron core is disposed in the chamber, a support rod for supporting a moving contact is disposed above the moving iron core, the moving iron core is connected with the support rod through a connecting spring, and the lower end rod part of the support rod and the moving iron core are disposed in the chamber of the electromagnet. Under the action of the magnetic force of the electromagnet, the movable iron core moves upwards along the cavity, and meanwhile, under the action of the thrust and the spring force of the movable iron core, the supporting rod moves upwards along the cavity. The support rod is provided with a buffer spring on the outer periphery of the rod body above the electromagnet, the upper end of the buffer spring is fixedly connected with a moving contact 203, the moving contact is positioned on two sides of the outer periphery of the rod body of the support rod, and the upper end of the moving contact is provided with a pressing part around the rod body of the support rod. The buffer spring can buffer the pressure when the movable contact contacts the fixed contact, so that the movable contact and the fixed contact are prevented from being extruded and damaged in the contact process. The movable contacts surrounding the two sides of the support rod body are connected through the support rod body and the pressing piece, and the movable contacts are made of conductive materials. On the inner shell above the movable contact, fixed contacts (201, 202) and binding posts thereof are respectively arranged corresponding to the movable contacts on two sides of the support rod body. The fixed contacts are arranged at intervals, and cavities are arranged above the support rod body, namely on the inner shell between the fixed contacts. The support rod body and the movable iron core are respectively provided with a communicated through hole. An excitation shut-off actuator 206, in this embodiment a piston 206 with a rod, which may also be a slide with a rod, is arranged in the hollow. The excitation cutting execution unit is made of insulating materials. The piston is positioned in the cavity, the rod body of the piston rod penetrates through the through holes of the rod body of the support rod and the movable iron core, and the through holes are used for guiding up-and-down displacement. Within this cavity, an excitation shut-off energy storage unit 205 is provided above the piston. A limiting boss is arranged in the cavity near the upper end, the excitation cut-off energy storage unit 205 is abutted against the limiting boss, and the upper end of the excitation cut-off energy storage unit is fixed on the inner shell through cover plate compression. A sealing device is arranged at the opening of the lower end of the cavity, and a rod body of the piston rod penetrates through the sealing device. The sealing device can be a sealing film, a thin plate which is easy to break or other structures which are easy to be punched by the upper end part of the piston. When the movable contact moves upwards to be in contact with the fixed contact, the upper end part of the support rod body is positioned below the cavity sealing device.
The excitation cut-off energy storage unit 205 may be a gas generator or may be another physically or chemically converted energy storage unit. The electric control device can be driven to trigger by receiving an electric signal of an external control circuit to provide driving force for exciting the cut-off execution unit. At present, the excitation cut-off energy storage unit 205 generally adopts a gas generator, the gas generator receives an electric signal sent by an external control circuit and then acts to release high-pressure gas, the high-pressure gas drives a piston rod to downwards displace to break a sealing device, and then the lower part of the upper end part of the piston rod abuts against the upper end surface of a support rod body to drive the support rod to drive a movable contact to downwards forcibly displace, so that the movable contact is forced to be separated from a static contact, and the main circuit is disconnected. The piston is provided with a stop mechanism, and when the piston moves to a designated position, the stop mechanism assists the piston to stop moving and prevent the piston from reversing, so that the movable contact and the fixed contact of the contactor are prevented from being connected again due to vibration, electromagnetic interference and the like.
An auxiliary arc extinguishing device 207 is arranged outside the inner shell, and various auxiliary arc extinguishing devices are provided, and the auxiliary arc extinguishing device is an arc extinguishing fuse. In this embodiment, an arc extinguishing fuse is used. One end of the arc extinguishing fuse is electrically connected with the fixed contact and the binding post 201 at the input end of the contactor, and the other end of the arc extinguishing fuse passes through the position corresponding to the lower end of the piston rod and is electrically connected with the fixed contact 202 and the binding post at the output end of the contactor. The conductors of the arc extinguishing fuse, which are respectively and electrically connected with the static contacts (201, 202) and the binding posts are conductive plates. The conducting plate at the corresponding position of the lower end of the piston rod is broken into two parts, a switch fracture 208 is arranged between the two parts of conducting plates, and the appearance of the minimum inner diameter of the conducting plate is matched with the appearance of the rod body of the piston rod. Through holes for the rod body of the piston rod to pass through are respectively formed in the inner shell above the fracture and the electromagnet, and the lower end of the piston rod is arranged in the switch fracture in a penetrating way. A circle of conducting ring layer 210 is arranged on the outer peripheral wall of the rod body at the lower part of the piston rod, when the contactor is in the normal working state, the conducting ring layer is positioned above the switch fracture and is not contacted with the fracture of the conducting plate, and the arc extinguishing circuit is not conducted because the piston and the rod body are made of insulating materials; when the moving contact and the fixed contact are required to be excited to be cut off in an abnormal way, the piston rod is displaced downwards, the conductive structure moves downwards along with the moving contact to enter the fracture of the switch to be in close contact with the fracture, and the arc extinguishing circuit is conducted, so that the arc extinguishing fuse is fused to conduct arc extinguishing.
The outer shell, the auxiliary arc extinguishing device and the like are further coated with an outer shell, a circuit board 209 is arranged on one side between the outer shell and the inner shell, and the circuit board 209 is connected with the energy storage unit 205 to provide electric signals for the energy storage unit. When the overload current is small or the generated arc is small, the auxiliary arc extinguishing device can be used for extinguishing arc. The circuit board is also not arranged and can be directly connected with the excitation cut-off energy storage unit through an external control circuit.
The working principle is as follows: referring to fig. 7 and 8, in a normal operation state, when the main circuit is required to be connected, the electromagnet 204 of the contactor generates magnetic force, and under the action of electromagnetic force and a spring, the moving iron core moves upwards, so that the support rod and the moving contact are driven to displace upwards to the position of the fixed contact to be contacted with the fixed contact, and the main circuit is connected. At this time, the upper end face of the supporting rod is positioned below the sealing device of the cavity where the upper end part of the piston rod is positioned; the upper end of the piston rod is located at the initial position in the cavity, the lower end of the piston rod is located at the initial position in the fracture in the arc extinguishing circuit, the conducting ring at the lower end of the piston rod is located above the fracture, the arc extinguishing circuit is not conducted, and the excitation and cutting-off energy storage unit 205 does not act.
When an unexpected fault occurs and the contactor cannot automatically break the main circuit, the excitation and disconnection energy storage unit 205 receives an electric signal to trigger action, high-pressure gas is released to drive the piston to move downwards, the upper end part of the piston rod breaks through the sealing device of the cavity and then is propped against the upper end surface of the support rod; the lower end of the piston rod synchronously moves downwards, and a conductive structure 217 on the piston rod enters a switch fracture of the arc extinguishing circuit to be communicated with the arc extinguishing circuit; meanwhile, the piston forcedly pushes the supporting rod to downwards drive the moving contact to downwards displace, so that the moving contact is forced to be separated from the fixed contact, and the main circuit is disconnected; after the main circuit is disconnected, the instantaneous overload current fuses an arc-extinguishing fuse in the conducted arc-extinguishing circuit, and the current is cut off to conduct arc extinction.
After the circuit is cut off, a stop mechanism on the cut-off module execution unit 206 is excited to stay at a stop position, so that the contact moving contact 203 and the contact fixed contacts (201 and 202) are always kept at a separation position, and the main circuit is prevented from being switched on by mistake.
Referring to fig. 9, 10, 11 and 12, another contactor structure is shown. An electromagnet 404 is arranged at the inner lower part of the insulating shell, a movable iron core is arranged in a cavity in the electromagnet, a guide sleeve is arranged in the electromagnet cavity above the movable iron core, and the guide sleeve is fixedly arranged on the insulating shell above the electromagnet. A connecting spring is arranged between the movable iron core and the guide sleeve. The supporting rod penetrates through the guide sleeve and is fixedly connected with the movable iron core. Moving contacts 403 are arranged on two sides of the outer periphery of the upper end of the supporting rod, a buffer spring is arranged on the outer periphery of the supporting rod below the moving contacts, the moving contacts are fixed at the upper end of the buffer spring, and a pressing part is arranged on the moving contacts. Fixed contacts (401, 402) and binding posts thereof are arranged on the corresponding insulating shell above the movable contact at intervals, a cavity is arranged on the insulating shell between the fixed contacts, an excitation cutting energy storage unit 405 and an excitation cutting execution unit 406 are sequentially arranged in the cavity from top to bottom, and a sealing film 407 for sealing the cavity is arranged below the excitation cutting execution unit. The excitation execution unit 406 is made of an insulating material, which may be a piston or a slider, and in this embodiment is a piston. The lower end of the piston is an impact end which is in the shape of a cone, frustum, circle or other structural form, in this embodiment a cone-shaped structure is used. The excitation cut-off energy storage unit 405 may be a gas generator or may be another physically or chemically converted energy storage unit. Which can be activated by receiving an electrical signal from an external control circuit to provide a driving force for activating the shut-off actuator. At present, the exciting and cutting-off energy storage unit 405 generally adopts a gas generator, the gas generator receives an electric signal sent by an external control circuit and then acts to release high-pressure gas, the high-pressure gas drives a piston to downwards displace to break a sealing device and then to press the upper end face of a supporting rod, the moving contact is forcedly downwards displaced, the moving contact is separated from the fixed contact, and the main circuit is disconnected. An auxiliary arc extinguishing device 408 is provided on the outside of the insulating housing on the side of the moving contact and the fixed contact, and the auxiliary arc extinguishing device in this embodiment adopts an arc extinguishing fuse, or may be another device having an arc extinguishing function. One end of the arc extinguishing fuse is connected with a fixed contact 401 serving as an input end through a conductive plate, and the other end of the arc extinguishing fuse is connected with a fixed contact 402 serving as an output end through a conductive plate. The two ends of the two conductive plates are conductive elastic pieces (411, 412) with certain elasticity, and the conductive elastic pieces (411, 412) form a switch fracture outside the insulating shell. A through hole is provided in the insulating housing corresponding to the fracture, an insulating connecting rod 409 is provided in the through hole as an arc extinguishing circuit control switch, and a circle of conductive structure 410 is provided on the outer peripheral wall of the connecting rod. One end of the connecting rod extends out of the through hole and is abutted against the peripheral inclined plane of the impact end of the piston. The other end extends out of the insulating shell and is positioned in a fracture formed by the conductive elastic sheet. When the piston does not act, the conductive structure 410 on the connecting rod is not connected with the switch fracture formed by the conductive spring piece, i.e. the conductive ring layer 410 is positioned outside the fracture. When the piston moves downwards, the impact end inclined plane of the piston presses the connecting rod to displace outwards along the through hole, the conducting ring layer on the connecting rod enters the switch fracture to be connected with the conducting elastic sheets (411 and 412), and the arc extinguishing circuit is conducted, so that the arc extinguishing fuse is fused to cut off current and extinguish arc. The stop mechanism is arranged on the piston, when the piston reaches the end position, the support rod is pressed to force the moving contact to be separated from the fixed contact, and the stop mechanism ensures that the piston is always positioned at the end position, so that misoperation is prevented, and the moving contact is upwardly displaced to be contacted with the fixed contact again.
The working principle of the structure is shown in fig. 13 to 16, when the contactor works normally, the electromagnet drives the moving iron core to displace upwards when the circuit is initially switched on, and the supporting rod and the moving contact are driven to displace upwards to contact with the fixed contact to conduct the main circuit. At this time, the piston is located the initial position department in the cavity, and connecting rod one end supports and leans on the inclined plane lower part of the impact end of piston, and the other end is located the outside conductive shell fragment of insulating housing and forms the port, and conductive structure on the connecting rod is located the fracture outside, does not contact with the switch fracture to be connected, and the arc extinguishing circuit is non-conductive, and excitation cut-off module is motionless. When unexpected faults occur, the excitation cut-off energy storage unit receives an electric signal sent by the control protection circuit, the electric signal triggers the gas generator to act to release a large amount of high-pressure gas, under the action of the high-pressure gas, the piston moves downwards to break the sealing film to press against the upper end face of the support rod, the support rod is driven to drive the movable contact to displace downwards, the inclined plane of the impact end of the piston rod presses against the connecting rod to displace outwards along with the downward displacement of the piston rod, and the conductive structure on the connecting rod enters the switch fracture to conduct the arc extinguishing circuit; meanwhile, the piston continues to downwards, so that the moving contact and the fixed contact are forcefully separated from contact, and the main circuit is disconnected; since this process is very short, the time required is approximately 2ms or so. When the main circuit is disconnected, the generated instant overload current causes the fuse to blow off the cut-off current to conduct arc extinction.
After the main circuit is cut off and the arc extinguishing fuse is extinguished, the stop mechanism on the piston fixes the stop mechanism at the end position, so that the moving contact is prevented from being switched on the main circuit again by misoperation.
The auxiliary arc extinguishing device in each of the above embodiments is an arc extinguishing fuse, which is typically a melt type fuse, and an arc extinguishing medium such as sand is filled inside the fuse.
The retaining mechanism in the above embodiment is usually a barb or a buckle structure, and after the actuating unit of the cutting module is activated to move in place, the buckle and the corresponding position are buckled, so that the actuating unit is prevented from backing.
The switch break in the above embodiments may be horn-shaped, square-shaped, or other shapes.
Claims (15)
1. The novel contactor structure with the excitation cutting-off function comprises an insulating shell, wherein an electromagnet is arranged in the insulating shell, a moving iron core is arranged in a cavity in the electromagnet, a supporting rod is connected to the moving iron core, moving contacts are positioned on two sides of the periphery of the supporting rod body, and fixed contacts which are arranged at corresponding intervals are arranged on the insulating shell above the moving contacts;
When the excitation cutting-off energy storage unit receives the electric signal to trigger action, high-pressure gas is released to serve as driving force to drive the excitation cutting-off execution unit to displace, the movable contact is pressed against displacement, the movable contact is separated from conductive contact with the fixed contact, and the main circuit is disconnected.
2. The contactor structure according to claim 1, characterized in that an auxiliary arc extinguishing device is provided at one side of the moving contact and the stationary contact; two ends of the auxiliary arc extinguishing device are respectively connected with a fixed contact serving as an input end and a fixed contact serving as an output end through an arc extinguishing circuit, and a switch fracture for disconnecting the arc extinguishing circuit is arranged on the arc extinguishing circuit; when the excitation cut-off energy storage unit receives an electric signal to trigger action, high-pressure gas is released to serve as driving force to drive the excitation cut-off execution unit to displace, the switch fracture is conducted firstly, and therefore the arc extinguishing circuit is conducted; and then driving the excitation cut-off execution unit to separate the moving contact from the static contact to disconnect the main circuit, and then disconnecting the arc extinguishing circuit by the auxiliary arc extinguishing device to extinguish arc.
3. The contactor structure according to claim 1, wherein a guide sleeve is provided on the insulating housing above the moving core, the moving core being connected thereto by a spring; the support rod is located in the guide sleeve.
4. The contactor structure according to claim 1, wherein a spring is fixedly sleeved on the periphery of the upper end of the support rod, and the movable contact is connected to the upper end of the spring and is pressed against the upper surface of the movable contact through a pressing plate to be limited and fixed.
5. The contactor structure according to claim 2, wherein through holes are provided in the support rod and the moving core, respectively; the switch fracture of the arc extinguishing circuit is positioned below the through hole; the excitation cutting-off execution unit is a piston with a rod body, and the lower end of the piston rod body is positioned in the switch fracture after passing through the through hole; a conductive structure is arranged on the periphery of the piston rod above the switch fracture; when the piston moves downwards, the conducting structure on the piston rod moves downwards to enter the switch fracture, after the arc extinguishing circuit is conducted, the piston moves downwards, the supporting rod is pressed to drive the moving contact to break away from the contact with the fixed contact to cut off the main circuit, then the auxiliary arc extinguishing device is fused, and the arc extinguishing circuit is disconnected to extinguish arc.
6. The contactor structure according to claim 5, wherein an insulating housing is coated outside the auxiliary arc extinguishing device, the insulating housing, and the switch break.
7. The contactor structure according to claim 6, characterized in that a circuit board is provided between the insulating housing and the insulating shell, the circuit board being connected to the excitation cut-off energy storage unit.
8. The contactor structure according to claim 2, wherein the switch break is located outside an insulating housing on one side of the excitation cut-off execution unit, an impact end of the excitation cut-off execution unit has an inclined surface, a connection rod is provided between the switch break and the excitation cut-off execution unit, one end of the connection rod abuts against the inclined surface of the impact end of the excitation cut-off execution unit, the other end of the connection rod is located in the switch break, and a conductive structure is provided on the connection rod located outside the switch break; when the cut-off execution unit is excited to move downwards, the impact end inclined plane of the cut-off execution unit extrudes the connecting rod to displace outwards, so that the conductive structure on the connecting rod is forced to enter the switch fracture, and the arc extinguishing circuit is conducted.
9. The contactor structure according to claim 8, wherein the excitation cut-off actuator is a piston having an impact end of a conical, frustoconical, circular or trapezoidal configuration.
10. The contactor structure according to claim 8, wherein a guide through hole is formed in the insulating housing, and the connection rod is located in the guide through hole.
11. The contactor structure according to any one of claims 1 to 10, characterized in that a sealing film is provided at the lower end of the cavity in which the excitation cut-off energy storage unit and the excitation cut-off execution unit are located.
12. The contactor structure according to claim 2, wherein the connection lines of the arc suppressing circuit are conductive plates; the conducting plate end at the fracture of the switch is a conducting spring piece.
13. The contactor structure according to claim 12, wherein the switch break is a horn-like structure.
14. The contactor structure according to claim 2, characterized in that the auxiliary arc extinguishing means is a fuse internally filled with an arc extinguishing medium.
15. The contactor structure according to claim 1, wherein a backstop mechanism is provided on the excitation cut-off actuator unit that will assist it to stop moving and prevent reversing when the excitation cut-off actuator unit is moved to a final position.
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| CN201810902405 | 2018-08-09 | ||
| CN2018109024052 | 2018-08-09 |
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| CN109087828B true CN109087828B (en) | 2024-05-07 |
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| CN110571113A (en) * | 2019-10-27 | 2019-12-13 | 西安中熔电气股份有限公司 | Auxiliary arc extinguishing structure of excitation fuse |
| CN114758923B (en) * | 2022-03-15 | 2024-02-06 | 西安中熔电气股份有限公司 | Fuse integrated contactor |
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