CN211957555U - Self-locking device for electromagnetic mechanism of alternating current contactor - Google Patents
Self-locking device for electromagnetic mechanism of alternating current contactor Download PDFInfo
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- CN211957555U CN211957555U CN201922009524.8U CN201922009524U CN211957555U CN 211957555 U CN211957555 U CN 211957555U CN 201922009524 U CN201922009524 U CN 201922009524U CN 211957555 U CN211957555 U CN 211957555U
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Abstract
The invention is used in the auto-lock device of the electromagnetic mechanism of the AC contactor, the locking plate is not in the position of the card slot when the initial position, is withstood the spacing by the spacing body on the top of the main iron core, the lever presses the travel switch to keep closed, when the main coil is switched on with AC, the main iron core attracts, the spacing body stretches out upwards, the locking plate moves to the position of the card slot and is clamped into the card slot, the reset spring pulls the lever to rotate anticlockwise in the opposite direction, the travel switch is released, the main coil loses power, but because of the action of the locking plate and the card slot, the main iron core is locked on the attracting position, the auxiliary coil has no power at this moment, the; when the power supply in the coil working circuit is powered off during releasing, the auxiliary coil receives the command signal and is quickly attracted, the auxiliary iron core is pulled downwards, the lever rotates clockwise and forwardly, the locking sheet is separated from the clamping groove, the main iron core resets, and the lever presses the travel switch to be closed, so that the main coil is restored to the initial position.
Description
Technical Field
The invention relates to a self-locking device for an electromagnetic mechanism of an alternating current contactor.
Background
For power transmission and distribution equipment such as an electric switch, such as an ac contactor, various electromagnetic mechanisms including a coil, an iron core, a reset device, etc. are often used; however, in many occasions, the coil needs to be continuously powered after the coil is attracted so as to keep the normal working state of the electromagnetic mechanism, and when the electromagnetic mechanism such as an alternating current contactor, an electromagnetic control and protection switch and the like is in an attraction position in the working process, the coil needs to be continuously powered so as to keep the attraction state; the traditional electromagnetic mechanism has a complex structure, high energy consumption in continuous energization, easy burning loss of a coil in long-time energization, poor reliability and easy failure of the mechanism in sudden interference conditions; and the auxiliary interlocking function provided by other mechanical structures is adopted, most of the auxiliary interlocking mechanisms have complex structures, inconvenient operation and difficult reliability guarantee.
Disclosure of Invention
The invention aims to solve the technical problem of providing a self-locking device for an electromagnetic mechanism of an alternating current contactor, which can keep self-locking in the attraction state of the electromagnetic mechanism, has simple and compact structure, low energy consumption, simple and reliable attraction and release processes and convenient operation.
The invention relates to a self-locking device for an electromagnetic mechanism of an alternating current contactor, which comprises the electromagnetic mechanism consisting of a main coil and a main iron core, and is characterized in that: the top end of the main iron core is fixedly connected with a limiting body, and the diameter of a connecting section between the limiting body and the main iron core is smaller than that of the limiting body to form a clamping groove; when the main coil is electrified and attracted, the limiting body extends upwards along with the main iron core, and when the main coil is out of power, the limiting body retreats downwards along with the main iron core under the action of an internal reset mechanism (comprising a reset spring and the like); the main coil bracket is fixedly provided with an installation seat, a lever is arranged above the installation seat through a hinged shaft, the middle part of the lever is connected with a locking sheet which can swing along with the lever, the locking sheet is positioned on one side of the main iron core, when in a self-locking position, the locking sheet swings reversely and can be clamped into a clamping groove to lock the main iron core, and when in an initial position, a limiting body can limit and support the locking sheet, so that the lever presses a travel switch in a coil working circuit of the main coil to keep the coil working circuit on; one end of the lever is connected with an instantaneous driving mechanism which can instantaneously press the lever to swing in the positive direction, and the other end of the lever is connected with a reverse return spring;
the instantaneous driving mechanism comprises an auxiliary electromagnetic coil and an auxiliary iron core which is driven by the auxiliary electromagnetic coil to stretch, and the auxiliary iron core is connected with the lever; when the instantaneous current is introduced, the auxiliary iron core which acts instantaneously can complete the action of one-time pressing of the lever to swing in the positive direction;
the reset spring is connected between the rear end of the lever and the mounting seat, and the mounting seat is also provided with a limiting surface capable of limiting the reverse swing stroke of the lever;
the instantaneous driving mechanism and the travel switch are both fixedly arranged on the mounting seat;
the upper part of the auxiliary iron core is provided with a neck part with a smaller diameter, the lever is in matched insertion with the neck part through a U-shaped slot at the end part, and the lever can be pulled by utilizing the limit of the neck part during the wicking of the auxiliary iron core;
the reverse reset spring is a tension spring, and the travel switch is a microswitch;
the main coil is provided with a control circuit, and the control circuit comprises a coil working loop and a control loop; the coil working circuit comprises a main coil and a travel switch K1 which are connected between the input ends of the alternating current power supply; the control loop comprises a rectifying circuit connected with an input end of an alternating current power supply, and a control unit, an auxiliary electromagnetic coil and a charging capacitor are connected between two poles of a direct current output end of the rectifying circuit to form a direct current charging and discharging loop; the control unit can control the charging and discharging of the charging capacitor and the time.
The invention is used in the auto-lock device of the electromagnetic mechanism of the AC contactor, the locking plate is not in the position of the card slot when the initial position, is withstood the spacing by the spacing body on the top of the main iron core, the lever presses the travel switch to keep closed, when the main coil is switched on with AC, the main iron core attracts, the spacing body stretches out upwards, the locking plate moves to the position of the card slot and is clamped into the card slot, the reset spring pulls the lever to rotate anticlockwise in the opposite direction, the travel switch is released, the main coil loses power, but because of the action of the locking plate and the card slot, the main iron core is locked on the attracting position, the auxiliary coil has no power at this moment, the; when the power supply in the coil working circuit is powered off during releasing, the auxiliary coil receives the command signal and is quickly attracted, the auxiliary iron core is pulled downwards, the lever rotates clockwise and forwardly, the locking sheet is separated from the clamping groove, the main iron core resets, and the lever presses the travel switch to be closed, so that the main coil is restored to the initial position.
Drawings
FIG. 1 is a schematic plan view of a self-locking device for an electromagnetic mechanism of an AC contactor according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a self-locking device for an electromagnetic mechanism of an AC contactor according to an embodiment of the present invention in an initial position;
FIG. 3 is a schematic structural diagram of a cross section of a self-locking device of an electromagnetic mechanism of an AC contactor according to an embodiment of the present invention after being locked in a pull-in state;
fig. 4 is a circuit diagram of an embodiment of the present invention.
Detailed Description
As shown in the figure, the main structure of the self-locking device for the electromagnetic mechanism of the alternating current contactor adopts the conventional electromagnetic mechanism consisting of a main coil 1 and a main iron core 8, the main coil 1 controls the main iron core 8 to extend out, or the main iron core 8 retracts inwards under the action of a reset mechanism consisting of a reset spring in the main coil 1, and the switching-off or switching-on action is executed.
In this embodiment, a cylindrical stopper 8 extending coaxially upward is connected to the top end of the main core 8, the diameter of the connecting section between the stopper 8 and the main core is smaller than that of the stopper 8, and the diameter of the connecting section between the stopper 8 and the main core is smaller than that of the stopper, so as to form a slot 81, when the main coil 1 is energized and attracted, the stopper 8 extends upward along with the main core under the action of electromagnetic induction force, and when the main coil is de-energized, the stopper 8 retreats downward along with the main core under the action of an internal reset mechanism (including a reset spring, etc.).
A mounting seat 5 is fixed above the bracket of the main coil 1, the mounting seat 5 is approximately in a U-shaped structure and is fixedly mounted and connected on the bracket of the main coil 1 through a bottom plate of the U-shaped structure, and a notch is arranged in the middle of the bottom plate of the mounting seat 5 so that a limiting body extends out or retracts upwards along with the main iron core 8; a vertically upward limiting baffle 51 is arranged at one end of a U-shaped structure of the mounting seat 5, a microswitch is fixedly mounted on the inner side of the baffle 51 to form a travel switch 6, an auxiliary electromagnetic coil 2 is fixedly mounted on the outer side, and an auxiliary iron core 3 is arranged in the auxiliary electromagnetic coil 2 to form an instantaneous driving mechanism; a transverse lever 7 is arranged above the mounting seat 5, and the middle part of the lever 7 is hinged to the mounting seat through a hinge shaft; the other side of the hinged shaft 9, which is opposite to the travel switch 6, is fixedly connected with a locking sheet 71 which can swing along with the lever 7, when the hinged shaft is in a self-locking position, the locking sheet 71 swings anticlockwise in the opposite direction and can be clamped into the clamping groove 81 to lock the main iron core, and when the hinged shaft is in an initial position, the outer circumferential surface of the limiting body 8 can limit and prop against the locking sheet 71, so that the lever 7 presses the travel switch 6 in a coil working circuit of the main coil 1 to keep the coil working circuit conducted;
a section of neck with a smaller diameter is arranged at the upper part of the auxiliary iron core 3, so that a limiting pressing block 4 is formed above the top of the auxiliary iron core, a round opening limiting groove is formed at the end part of the lever 7 corresponding to the limiting pressing block 4 to form a U-shaped slot, the lever 7 is matched with the limiting clamping at the neck below the limiting pressing block 4 through the U-shaped slot, and the lever 7 is pressed and driven to swing around a hinged shaft 9 in the positive direction through a limiting step at the upper part of the limiting pressing block 4 when the auxiliary electromagnetic coil 2 acts instantaneously; the other end of the lever 7 is connected with a reverse return spring 10 formed by a tension spring, and the reverse return spring is stressed and stretched when the lever 7 swings in the forward direction, so that the lever 7 can be pulled to reset in the reverse direction through the elastic restoring force of the reverse return spring 10.
The travel switch 6 is connected in the coil working circuit of the main coil 1, when the lever 7 swings in the forward direction, the travel switch 6 is pressed to control the coil working circuit of the main coil L1 to be closed and conducted, and when the lever swings in the reverse direction, the coil working circuit is opened and closed.
Further, the upper end limit of the reverse return spring 10 is fixed at the end of the lever 7, the lower end limit is fixed on one side wall of the U-shaped structure of the mounting seat 5, and the part of the other side wall of the U-shaped structure of the mounting seat 5 corresponding to the reverse return spring 10 constitutes a limit structure 51 for reverse return of the lever 7.
Furthermore, the stroke switch 6 is fixedly arranged on the mounting base bottom plate at the inner side of the baffle plate 52, so that the structure is compact, and the occupied space is small.
According to the control principle of the embodiment of the invention, as shown in fig. 2, the mechanism is in an initial position before working, the limiting body 8 retracts into the main coil 1 along with the main iron core when in the initial position, the main coil 1 is powered off, and the whole mechanism is in a non-power state; the auxiliary coil 2 is also powered off, the auxiliary iron core 3 is in a free state, the lever 7 is connected to the upper end of the auxiliary iron core 3, the locking sheet 71 is not located at the position of the clamping groove 81 and is propped against the limiting position of the limiting body 8, the lever 7 cannot rotate, the reset spring 10 is pulled, and the travel switch 6 is pressed and closed by the lever 7;
when the switch needs to be switched on, alternating current is introduced into the main coil 1, the limiting body 8 extends upwards along with the main iron core, the locking sheet 71 moves to the position of the clamping groove 81 and is clamped into the clamping groove 81, the lever 7 reversely and anticlockwise rotates under the action of elastic restoring force of the reset spring 10, the travel switch is released, the locking sheet 71 moves to enter the clamping groove 81 to be locked, the main coil 1 is powered off, but due to the action of the locking sheet 71 and the clamping groove 81, the main iron core is locked at the attraction position, at the moment, the auxiliary coil 2 is not electrified, and the auxiliary iron core 3 is in a free state;
when the device is released, the auxiliary coil receives an instruction signal and is quickly sucked, the auxiliary iron core is pulled downwards, the lever rotates clockwise and forwardly, the locking piece is separated from the clamping groove, the main iron core is reset, the lever 7 presses the travel switch 6 to be closed, the main coil 1 is restored to the initial position shown in the figure 1, the next action is prepared, and the device operates circularly; at this time, neither the main coil nor the auxiliary coil is operated.
FIG. 4 is a circuit diagram of a first embodiment of the present invention, which includes a DC charging circuit and an AC coil working circuit; the charging circuit comprises an auxiliary coil L1 and a charging capacitor C4, and the coil working circuit comprises a travel switch K1 and a main coil L2;
when the main coil L2 is needed to work, an alternating current power supply is used for inputting current, direct current is output through a rectifying circuit, a control unit starts a direct current charging loop, and the direct current passes through a circuit to rapidly charge a charging capacitor, so that the charging capacitor is instantly fully charged; the other circuit supplies power to a coil working circuit of the main coil L2, the travel switch K1 is in a closed state at the moment, the main coil L2 is electrified to attract, attraction and locking actions are completed, after the main iron core is locked by the locking piece, the K1 is released and disconnected, the coil working circuit loses power, and the attraction power-off maintaining process is completed;
when the instruction circuit is powered off and the main coil is released, the alternating current power supply is powered off, no voltage exists at the direct current end, the capacitor discharges and supplies power to the auxiliary coil L1, so that the auxiliary coil L1 acts to attract once;
the Q2 is opened through the circuit by the electric energy stored in the capacitor, the charging capacitor C4 is discharged through the auxiliary coil L1 quickly, the auxiliary coil L1 is attracted once, the electromagnetic mechanism is released by pulling the mechanism, and the circuit is opened quickly to discharge the electromagnet when the electricity is lost. The control circuit controls each step to act according to the time sequence, and the control circuit is simple and compact in structure and good in effect.
Claims (7)
1. The utility model provides a self-lock device for ac contactor electromagnetic mechanism, is including the electromagnetic mechanism who constitutes by main coil and main iron core, its characterized in that: the top end of the main iron core is fixedly connected with a limiting body, and the diameter of a connecting section between the limiting body and the main iron core is smaller than that of the limiting body to form a clamping groove; when the main coil is electrified and attracted, the limiting body extends upwards along with the main iron core, and when the main coil is out of power, the limiting body retreats downwards along with the main iron core under the action of an internal reset mechanism, wherein the internal reset mechanism comprises a reset spring; the main coil bracket is fixedly provided with an installation seat, a lever is arranged above the installation seat through a hinged shaft, the middle part of the lever is connected with a locking sheet which can swing along with the lever, the locking sheet is positioned on one side of the main iron core, when in a self-locking position, the locking sheet swings reversely and can be clamped into a clamping groove to lock the main iron core, and when in an initial position, a limiting body can limit and support the locking sheet, so that the lever presses a travel switch in a coil working circuit of the main coil to keep the coil working circuit on; one end of the lever is connected with an instantaneous driving mechanism which can instantaneously press the lever to swing in the positive direction, and the other end of the lever is connected with a reverse return spring.
2. The self-locking device for an electromagnetic mechanism of an ac contactor according to claim 1, wherein: the instantaneous driving mechanism comprises an auxiliary electromagnetic coil and an auxiliary iron core which is driven by the auxiliary electromagnetic coil to stretch, and the auxiliary iron core is connected with the lever; when the instantaneous current is introduced, the auxiliary iron core which acts instantaneously can complete the action of one-time pressing of the lever to swing in the positive direction.
3. The self-locking device for an electromagnetic mechanism of an ac contactor according to claim 2, wherein: the reset spring is connected between the rear end of the lever and the mounting seat, and the mounting seat is further provided with a limiting surface capable of limiting the reverse swing stroke of the lever.
4. The self-locking device for an electromagnetic mechanism of an ac contactor according to claim 3, wherein: the instantaneous driving mechanism and the travel switch are both fixedly installed on the installation seat.
5. The self-locking device for an electromagnetic mechanism of an ac contactor according to claim 4, wherein: the upper part of the auxiliary iron core is provided with a neck part with a smaller diameter, and the lever is in matched insertion connection with the neck part through a U-shaped slot at the end part.
6. The self-locking device for an electromagnetic mechanism of an ac contactor as claimed in claim 5, wherein: the reverse reset spring is a tension spring, and the travel switch is a microswitch.
7. The self-locking device for an electromagnetic mechanism of an ac contactor according to claim 6, wherein: the main coil is provided with a control circuit, and the control circuit comprises a coil working loop and a control loop; the coil working circuit comprises a main coil and a travel switch which are connected between the input ends of the alternating current power supply; the control loop comprises a rectifying circuit connected with an input end of an alternating current power supply, and a control unit, an auxiliary electromagnetic coil and a charging capacitor are connected between two poles of a direct current output end of the rectifying circuit to form a direct current charging and discharging loop; the control unit can control the charging and discharging of the charging capacitor and the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922009524.8U CN211957555U (en) | 2019-11-20 | 2019-11-20 | Self-locking device for electromagnetic mechanism of alternating current contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922009524.8U CN211957555U (en) | 2019-11-20 | 2019-11-20 | Self-locking device for electromagnetic mechanism of alternating current contactor |
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| Publication Number | Publication Date |
|---|---|
| CN211957555U true CN211957555U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922009524.8U Active CN211957555U (en) | 2019-11-20 | 2019-11-20 | Self-locking device for electromagnetic mechanism of alternating current contactor |
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| Country | Link |
|---|---|
| CN (1) | CN211957555U (en) |
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- 2019-11-20 CN CN201922009524.8U patent/CN211957555U/en active Active
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