CN113963990B - DC contactor - Google Patents
DC contactor Download PDFInfo
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- CN113963990B CN113963990B CN202111214971.2A CN202111214971A CN113963990B CN 113963990 B CN113963990 B CN 113963990B CN 202111214971 A CN202111214971 A CN 202111214971A CN 113963990 B CN113963990 B CN 113963990B
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- contactor
- switch
- arc
- conductive part
- circuit
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 28
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 39
- 230000000903 blocking effect Effects 0.000 claims description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 20
- 239000010703 silicon Substances 0.000 claims description 20
- 230000008093 supporting effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000010892 electric spark Methods 0.000 description 9
- 238000002955 isolation Methods 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
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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
- H01H50/541—Auxiliary contact devices
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The disclosure relates to the technical field of contactors and discloses a direct current contactor. The direct current contactor comprises a control loop, wherein the control loop comprises a main switch, an auxiliary switch, a first arc extinguishing circuit and a second arc extinguishing circuit, the auxiliary switch is connected in series with the first arc extinguishing circuit and then connected with the main switch in parallel, and the distance between a movable contact and a fixed contact of the auxiliary switch is smaller than the distance between the movable contact and the fixed contact of the main switch; the first arc extinguishing circuit is at least used for delaying the connection between the static contact of the auxiliary switch and the other electrode of the contactor after a first preset time period when the movable contact of the auxiliary switch is contacted with the static contact; the second arc extinguishing circuit comprises a magnetic switch and an arc absorption circuit which are connected in series, wherein the magnetic switch is at least used for being closed after the main switch is closed for a second preset time period and is opened after the main switch is opened for a third preset time period, and the arc absorption circuit is at least used for absorbing voltages at two ends of the main switch when the main switch is opened.
Description
Technical Field
The disclosure relates to the technical field of contactors, and in particular relates to a direct current contactor.
Background
The contacts of the conventional direct current contactor generate electric arcs or electric sparks only when the load is connected with or disconnected from a power supply, because the direct current voltage breaks down air between the contacts at the moment of connection and disconnection, and ionization phenomena with higher temperature are generated, particularly an inductive load, and the electric arcs are larger (high back electromotive force can be generated). The arc or spark discharge ablates the contact surface of the contactor, damages the contact, makes the surface uneven and oxidized, causes poor contact, and even causes adhesion failure between the contacts when serious. In addition, the arc or spark can generate high-frequency signals, and the high-frequency signals interfere with nearby control circuits through high-frequency radiation, wire transmission, distributed capacitance and other paths. There is also a risk of explosion initiation where flammable gases are present. Therefore, the arc or electric spark generated during the action of the traditional direct current contactor not only greatly reduces the service life of the direct current contactor and interferes with the normal operation of other electrical equipment, has potential safety hazard, but also seriously threatens the safe operation of the controlled equipment.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure aims to overcome the above-mentioned drawbacks of the prior art and provide a dc contactor.
According to one aspect of the present disclosure, there is provided a dc contactor including a control loop connected in series between two electrodes of the contactor, the control loop comprising: the main switch comprises a movable contact and a fixed contact, wherein the movable contact of the main switch is connected with one electrode of the contactor, and the fixed contact of the main switch is connected with the other electrode of the contactor; the auxiliary switch comprises a movable contact and a fixed contact, wherein the movable contact of the auxiliary switch is connected with one electrode of the contactor, the fixed contact of the auxiliary switch is connected with a first end of a first arc-extinguishing circuit, a second end of the first arc-extinguishing circuit is connected with the other electrode of the contactor, a control end of the first arc-extinguishing circuit is connected with an electromagnetic coil of the contactor, and the distance between the movable contact and the fixed contact of the auxiliary switch is smaller than that between the movable contact and the fixed contact of the main switch; the first arc extinguishing circuit is at least used for delaying connection between the fixed contact of the auxiliary switch and the other electrode of the contactor after a first preset time length when the movable contact of the auxiliary switch is contacted with the fixed contact; the second arc extinguishing circuit comprises a magnetic switch and an arc absorption circuit, one end of the magnetic switch is connected with one electrode of the contactor, the other end of the magnetic switch is connected with the first end of the arc absorption circuit, the second end of the arc absorption circuit is connected with the other electrode of the contactor, the magnetic switch is at least used for being closed after a second preset time period when the main switch is closed and being opened after a third preset time period when the main switch is opened, and the arc absorption circuit is at least used for absorbing voltages at two ends of the main switch when the main switch is opened.
In one exemplary embodiment of the present disclosure, the first arc extinguishing circuit includes: the first end of the controllable silicon is used as the first end of the first arc extinguishing circuit, the second end of the controllable silicon is used as the second end of the first arc extinguishing circuit, and the control end is connected with a delay circuit; the delay circuit comprises a first capacitor and a switch unit, wherein one end of the first capacitor is connected with the control end of the controllable silicon, and the other end of the first capacitor is connected with the other electrode of the contactor; the first end of the switch unit is connected with the first end of the controllable silicon, the second end of the switch unit is connected with the control end of the controllable silicon, and the control end is used as the control end of the first arc extinguishing circuit; the delay circuit is used for responding to the signal of the electromagnetic coil to delay the first end and the second end of the controllable silicon after the first preset time length.
In one exemplary embodiment of the present disclosure, the switching unit includes: the optocoupler comprises a light emitting piece and a light receiving piece, wherein two ends of the light emitting piece are used as control ends of the switch unit, a first pole of the light receiving piece is used as a first end of the switch unit, and a second pole of the light receiving piece is used as a second end of the switch unit.
In an exemplary embodiment of the present disclosure, the delay circuit further includes: the first resistor is connected in series with a connecting loop of the luminous piece of the optocoupler and the electromagnetic coil; and the second resistor is connected between the first pole of the light receiving element of the optocoupler and the first end of the silicon controlled rectifier.
In one exemplary embodiment of the present disclosure, the arc absorption circuit includes: a second capacitor, one end of which is used as a first end of the arc absorption circuit, and the other end of which is used as a second end of the arc absorption circuit; and the third resistor is connected in parallel with two ends of the second capacitor.
In one exemplary embodiment of the present disclosure, the magnetic switch includes: the static contact assembly comprises a first conductive part and a second conductive part, wherein the first conductive part and the second conductive part extend along a first direction and are opposite to each other in the first direction, one end of the first conductive part far away from the second conductive part is connected with one electrode of the contactor, one end of the second conductive part far away from the first conductive part is connected with a first end of the arc absorption circuit, and a gap is formed between opposite ends of the first conductive part and the second conductive part at a preset distance; the support assembly comprises a first support rod positioned at the first conductive part and a second support rod positioned at the second conductive part, wherein the first support rod and the second support rod extend along a second direction, and the second direction is intersected with the first direction; the fixed seat is fixed at one end of the first support rod and one end of the second support rod, which are far away from the fixed contact assembly, and a screw hole is formed in the part, located between the first support rod and the second support rod, of the fixed seat; the movable contact point assembly is positioned between the fixed seat and the fixed contact point, and comprises a third conductive part and a driving part, wherein the third conductive part extends along the first direction and is sleeved on the first support rod and the second support rod through corresponding holes; the driving part extends along the second direction, one end of the driving part is connected with the fixing seat, the other end of the driving part is connected with the third conductive part, the driving part is used for applying an acting force to the third conductive part when the third conductive part leaves the initial position, and the acting force is used for driving the third conductive part to return to the initial position.
In an exemplary embodiment of the present disclosure, the magnetic switch further includes: the magnet assembly moves along the second direction and comprises a magnet and a magnet mounting seat, the magnet faces the notch, and the size of the magnet in the first direction is smaller than or equal to the width of the notch in the first direction; the magnet mounting seat comprises a first blocking portion and a second blocking portion, wherein the first blocking portion extends along the first direction, the first blocking portion is located on one side of the first conductive portion and overlaps the first conductive portion in the first direction, and the second blocking portion is located on one side of the second conductive portion and overlaps the second conductive portion in the first direction.
In one exemplary embodiment of the present disclosure, when the first blocking portion contacts the first conductive portion and the second blocking portion contacts the second conductive portion, the attraction force of the magnet to the third conductive portion is greater than the force of the driving portion to the third conductive portion.
In an exemplary embodiment of the present disclosure, the driving part includes: the first spring is sleeved on the first supporting rod, and two ends of the first spring are correspondingly connected with the fixing seat and the third conductive part; the second spring is sleeved on the second supporting rod, and two ends of the second spring are correspondingly connected with the fixing seat and the third conductive part.
In an exemplary embodiment of the present disclosure, the magnetic switch further includes: the radial dimension of the adjusting screw is matched with the aperture of the screw hole of the fixing seat, a notch is formed in the end portion, away from the third conductive portion, of the adjusting screw, and the adjusting screw is used for adjusting the initial position of the third conductive portion, so that the initial distance between the third conductive portion and the stationary contact assembly is matched with a preset distance.
The direct current contactor provided by the disclosure, the auxiliary switch is connected with the first arc extinguishing circuit, and when the movable contact of the auxiliary switch is contacted with the fixed contact, the fixed contact of the auxiliary switch is connected with the other electrode of the contactor after the first time delay is preset, because the first arc extinguishing circuit is conducted in a time delay way, an arc or an electric spark cannot be generated at the moment of closing the auxiliary switch. When the main switch is closed, the auxiliary switch is connected in parallel with the main switch, so that the voltage drop across the main switch is equal to the voltage drop across the first arc extinguishing circuit, and the voltage drop across the first arc extinguishing circuit is very low, so that no arc or electric spark is generated at the moment when the main switch is closed. When the main switch is turned off, the arc absorption circuit can absorb the voltage across the main switch, so that an arc or spark is not generated at the instant when the main switch is turned off. In addition, when the auxiliary switch is opened, because the first arc extinguishing circuit is already opened, no current flows through the auxiliary switch, and thus no arc or spark is generated at the moment when the auxiliary switch is opened. Therefore, when the direct current contactor is attracted or broken, no arc or electric spark exists, and complete electric isolation can be realized after breaking.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic structural view of a dc contactor according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating the operation of a main switch and an auxiliary switch according to one embodiment of the present disclosure;
FIG. 3 is a schematic structural view of a magnetic switch according to one embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a structure of a magnetic switch prior to tuning according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a magnetic switch with contacts closed after adjustment according to one embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a magnet assembly returned after adjustment of a magnetic switch according to one embodiment of the present disclosure;
Fig. 7 is a schematic diagram of a magnetic switch according to an embodiment of the present disclosure after the contacts are thoroughly separated after adjustment.
Fig. 8 is a timing diagram of a dc contactor actuation process according to one embodiment of the present disclosure;
fig. 9 is a timing diagram of a dc contactor release process according to one embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.
The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.
In the related art, three methods for solving the problem of arc or spark generated when the contactor is powered on or powered off are mainly adopted: 1. an absorption capacitor is connected in parallel with a main switch of the direct current contactor. However, this method has a disadvantage: in order to avoid that the main switch is ablated by the instantaneous high-current discharge of the capacitor when the main switch is closed, a current-limiting resistor needs to be connected in series with the absorption capacitor, and the capability of the absorption capacitor for absorbing electric arcs and sparks is greatly influenced by adding the current-limiting resistor, so that the method cannot thoroughly eliminate the electric arcs and the sparks. And because the series resistance and capacitance are permanently connected in parallel with the contacts, complete electrical and physical isolation cannot be realized after the direct current contactor is released. 2. Some dc contactors are connected in parallel with an electronic switch on the main switch, but this is also required to be permanently connected in parallel with the contacts, and after the dc contactor is released, complete electrical and physical isolation cannot be achieved. 3. A dc solid state contactor is used. Although the direct current solid-state contactor can thoroughly eliminate electric arcs or electric sparks, the direct current solid-state contactor is used for controlling the on-off of a circuit by replacing a metal contact of a traditional contactor through a semiconductor component, and the direct current solid-state contactor mainly has the following defects: the pressure drop of the tube is large after the tube is conducted, and the power consumption and the heating value are also large; (2) After the switch-off, leakage current of a few microamps to a few milliamperes still exists, and complete electrical and physical isolation cannot be realized. In view of the foregoing, the present disclosure provides a dc contactor with a novel structure, and the structure and the working principle of the dc contactor of the present disclosure will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a dc contactor according to an embodiment of the present disclosure, the dc contactor may include a control loop connected in series between two electrodes of the contactor, and the control loop may include: the main switch NO1, the auxiliary switch NO2 and the second arc extinguishing circuit 300, wherein the main switch NO1 comprises a movable contact and a fixed contact, the movable contact of the main switch NO1 is connected with one electrode of the contactor, and the fixed contact of the main switch NO1 is connected with the other electrode of the contactor; the auxiliary switch NO2 comprises a movable contact and a fixed contact, the movable contact of the auxiliary switch NO2 is connected with one electrode of the contactor, the other contact of the auxiliary switch NO2 is connected with the first end of the first arc extinguishing circuit 200, the second end of the first arc extinguishing circuit 200 is connected with the other electrode of the contactor, the control end of the first arc extinguishing circuit 200 is connected with the electromagnetic coil 400 of the contactor, and the distance between the movable contact and the fixed contact of the auxiliary switch NO2 is smaller than the distance between the movable contact and the fixed contact of the main switch NO 1; the first arc extinguishing circuit 200 is at least used for delaying connection between the fixed contact of the auxiliary switch NO2 and the other electrode of the contactor after a first preset time period when the movable contact of the auxiliary switch NO2 is contacted with the fixed contact; the second arc extinguishing circuit 300 includes a magnetic switch NO3 and an arc absorbing circuit 301, one end of the magnetic switch NO3 is connected to one electrode of the contactor, the other end is connected to the first end of the arc absorbing circuit 301, the second end of the arc absorbing circuit 301 is connected to the other electrode of the contactor, the magnetic switch NO3 is at least used for being closed after the main switch NO1 is closed for a second preset period of time and being opened after the main switch NO1 is opened for a third preset period of time, and the arc absorbing circuit 301 is at least used for absorbing voltages at both ends of the main switch NO1 when the main switch NO1 is opened. In this exemplary embodiment, the first preset duration is determined according to the RC parameter in the first arc extinguishing circuit, and it should be noted that the first preset duration is smaller than the actuation duration of the main switch, that is, the first arc extinguishing circuit is already turned on before the moving contact of the main switch contacts the stationary contact. The second preset time length and the third preset time length are determined according to parameters of each device in the magnetic switch, and the second preset time length and the third preset time length can be the same.
The dc contactor provided by the present disclosure, the auxiliary switch NO2 is connected to the first arc extinguishing circuit 200, and when the movable contact of the auxiliary switch NO2 contacts with the stationary contact, the first arc extinguishing circuit 200 delays connection between the stationary contact of the auxiliary switch NO2 and another electrode of the contactor after a first preset period of time, because the first arc extinguishing circuit 200 delays connection, an arc or an electric spark will not be generated at the moment when the auxiliary switch NO2 is closed. When the main switch NO1 is closed, the auxiliary switch NO2 is connected in parallel with the main switch NO1, so that the voltage drop across the main switch NO1 is equal to the voltage drop across the first arc extinguishing circuit, and the voltage drop across the first arc extinguishing circuit 200 is very low, so that NO arc or spark is generated at the moment when the main switch NO1 is closed. When the main switch NO1 is turned off, the arc absorption circuit 301 can absorb the voltage across the main switch NO1, so that an arc or spark is not generated at the instant when the main switch NO1 is turned off. In addition, when the auxiliary switch NO2 is turned off, since the first arc extinguishing circuit 200 is already turned off, NO current flows through the auxiliary switch NO2, and thus NO arc or spark is generated at the instant when the auxiliary switch NO2 is turned off. Therefore, when the direct current contactor is attracted or broken, no arc or electric spark exists, and complete electric isolation can be realized after breaking.
In the present exemplary embodiment, the two electrodes of the contactor are used to connect the positive and negative poles of the circuit, and it should be understood that a load is included in the circuit, and the load is operated when the contactor is turned on and is not operated when the contactor is turned off. The load in fig. 1 is an equivalent load of the circuit, and as can be seen from the equivalent circuit in fig. 1, the contactor is connected in series with the load of the circuit and then connected between the positive electrode and the negative electrode of the power supply. It should be understood that which electrode of the contactor is connected to the positive and negative poles of the power supply in the present disclosure is not limited.
It should be understood that the dc contactor provided in the present disclosure includes, in addition to the above components, an iron core, an armature, a mounting fixture, a transmission, and the like of a conventional dc contactor. The various components of the contactor of the present disclosure will be further described with reference to the accompanying drawings. Fig. 2 is a schematic diagram illustrating the operation of the main switch and the auxiliary switch according to an embodiment of the present disclosure, as shown in fig. 2, in this exemplary embodiment, the distance d1 between the moving contact and the stationary contact of the main switch NO1 is greater than the distance d2 between the moving contact and the stationary contact of the auxiliary switch NO2, and the auxiliary switch NO2 has a certain elasticity, so that when the dc contactor is engaged, the auxiliary switch NO2 is closed before the main switch NO1, and similarly, when the dc contactor is released, the main switch NO1 is released before the auxiliary switch NO 2. With reference to fig. 1, it should be understood that the main switch NO1 and the auxiliary switch NO2 are linked switches, that is, the main switch NO1 and the auxiliary switch NO2 operate simultaneously, and can move synchronously with the armature mechanism of the contactor. The distance between the movable contact and the fixed contact of the main switch NO1 and the distance between the movable contact and the fixed contact of the auxiliary switch NO2 are set to be different, so that the auxiliary switch NO2 is closed before the main switch NO1 and is released later than the main switch NO1 in the action process of the two. Furthermore, in the present exemplary embodiment, since the auxiliary switch NO2 carries a very short load current, the contact area of the auxiliary switch NO2 may be much smaller than that of the main switch NO 1.
As shown in fig. 1, in the present exemplary embodiment, the first arc extinguishing circuit 200 may include a silicon controlled rectifier SCR and a delay circuit 201, wherein a first end of the silicon controlled rectifier SCR is used as a first end of the first arc extinguishing circuit 200, a second end of the silicon controlled rectifier SCR is used as a second end of the first arc extinguishing circuit 200, and a control end is connected to the delay circuit 201, it should be understood that the silicon controlled rectifier SCR has directivity, when the first end of the first arc extinguishing circuit 200 is connected to a positive electrode of a power supply, an anode of the silicon controlled rectifier SCR is used as the first end of the first arc extinguishing circuit 200, and conversely, if the first end of the first arc extinguishing circuit 200 is connected to a negative electrode of the power supply, a cathode of the silicon controlled rectifier SCR is used as the first end of the first arc extinguishing circuit 200; the delay circuit 201 may include a first capacitor C1 and a switch unit 202, where one end of the first capacitor C1 is connected to a control end of the SCR, and the other end is connected to another electrode of the contactor; the first end of the switch unit 202 is connected to the first end of the SCR, the second end is connected to the control end of the SCR, the control end is used as the control end of the first arc extinguishing circuit 200, and the delay circuit 201 is used for responding to the signal of the electromagnetic coil 400 and delaying the first end and the second end of the SCR after a first preset time length. As described above, in the process of the dc contactor being pulled in, the auxiliary switch NO2 is turned on before the main switch NO1, when the electromagnetic coil 400 of the contactor is powered on, the switch unit 202 is turned on, the dc power source charges the first capacitor C1 of the delay circuit 201 through the load 100 of the circuit-the auxiliary switch NO 2-the switch unit 202, when the voltage of the first capacitor C1 reaches the trigger voltage of the SCR, the SCR is turned on, and since the first capacitor C1 needs a short time to be charged, the SCR is not turned on at the moment when the auxiliary switch NO2 is turned on, so that an arc or an electric spark will not be generated. After that, the SCR is turned on, and after the SCR is turned on, the voltage between the movable contact and the stationary contact of the main switch NO1 is equal to the voltage drop of the SCR, and because the voltage drop of the SCR is very low, the voltage between the movable contact and the stationary contact of the main switch NO1 is very small. Thereafter, the armature of the dc contactor continues to move until the movable contact and the stationary contact of the main switch NO1 are closed, and as described above, NO arc or spark occurs at the moment when the main switch NO1 is closed because the voltages across the movable contact and the stationary contact of the main switch NO1 are small. It should be appreciated that in other exemplary embodiments, other devices may be used in place of the SCR to construct the first arc chute 200.
As shown in fig. 1, in the present exemplary embodiment, the switch unit 202 may include an optocoupler OP, where the optocoupler OP includes a light emitting element and a light receiving element, two ends of the light emitting element are used as control ends of the switch unit 202, a first pole of the light receiving element is used as a first end of the switch unit 202, and a second pole of the light receiving element is used as a second end of the switch unit 202. When the electromagnetic coil 400 of the dc contactor is powered on, the light emitting element of the optocoupler OP is turned on to emit light, so that the light receiving element of the optocoupler OP is turned on, and the switch unit 202 is turned on, and the dc power supply charges the first capacitor C1 through the load 100 of the circuit and the light receiving element of the auxiliary switch NO 2-optocoupler OP, so that the first arc extinguishing circuit 200 has a time delay conduction function in the suction process of the dc contactor, and the subsequent working process of the first capacitor C1 is not described herein. It should be understood that in other exemplary embodiments, the switch unit 202 may have other implementations, for example, a plurality of optocouplers OP are provided as the switch unit 202, or other controllable devices are used, which are all within the scope of the present disclosure.
As shown in fig. 1, in the present exemplary embodiment, the delay circuit 201 may further include a first resistor R1 and a second resistor R2, where the first resistor R1 is connected in series to a connection loop between the light emitting element of the optocoupler OP and the electromagnetic coil 400; the second resistor R2 is connected between the first pole of the light receiving element of the optocoupler OP and the first end of the SCR. The first resistor R1 and the second resistor R2 are current limiting resistors, and the current limiting effect of the first resistor R1 can protect the optocoupler OP from breakdown, and similarly, the current limiting effect of the second resistor R2 can protect the SCR from breakdown.
As shown in fig. 1, in the present exemplary embodiment, the arc absorption circuit 301 may include a second capacitor C2 and a third resistor R3, wherein two terminals of the second capacitor C2 serve as a first end and a second end of the arc absorption circuit 301, that is, one end of the second capacitor C2 is connected to the magnetic switch NO3, and the other end of the second capacitor C2 is connected to the other electrode of the contactor; the third resistor R3 is connected in parallel to two ends of the second capacitor C2. The arc absorption circuit 301 may absorb the voltage across the main switch NO1 when the main switch NO1 is turned off so that an arc or spark does not occur when the main switch NO1 is turned off. Specifically, when the electromagnetic coil 400 of the dc contactor is de-energized, the light emitting element in the optical coupler OP is turned off, so that the optical coupler OP is turned off, and at the same time, the armature of the electromagnetic mechanism of the dc contactor starts to return under the action of the spring force, as described above, when the electromagnetic coil 400 is de-energized, the main switch NO1 is turned off before the auxiliary switch NO2, and when the main switch NO1 is turned off, since the second capacitor C2 is directly connected in parallel to the two ends of the main switch NO1, the voltage on the second capacitor C2 is 0 and cannot be suddenly changed, and thus NO arc or spark will be generated at the moment when the main switch NO1 is turned off. Thereafter, the magnetic switch NO3 is turned off (for the working principle of the magnetic switch NO3, please refer to the following description of the embodiment), the second capacitor C2 is disconnected from the parallel connection position of the main switch NO1, and the second capacitor C2 is discharged through the third resistor R3. The armature of the electromagnetic mechanism of the direct current contactor continues to return under the action of the spring force, so that the auxiliary switch NO2 is opened. After the electromagnetic coil 400 is deenergized, the optocoupler OP is immediately turned off, the SCR is also in the off state, and NO current flows, so that NO arc or spark is generated when the auxiliary switch NO2 is turned off. The armature of the electromagnetic mechanism of the direct current contactor continues to return under the action of the spring force until the end position is released. It should be appreciated that in other exemplary embodiments of the present disclosure, the arc absorption circuit 301 may have other circuit configurations as well.
Fig. 3 is a schematic diagram of a magnetic switch according to an embodiment of the present disclosure, in which the magnetic switch NO3 is a specially designed magnetic switch, and the contact stroke thereof is longer than that of the normal magnetic switch NO3, and is adjustable, and in the present invention, the magnetic switch NO3 is a normally open switch. The magnetic switch NO3 may be closed again after the main switch NO1 is closed, and opened again after the main switch NO1 is opened. As shown in fig. 3, the magnetic switch NO3 may include a stationary contact assembly, a supporting assembly, a fixing base 9, a movable contact assembly, and a magnet assembly 18, and each assembly of the magnetic switch NO3 and its operation principle will be described in detail.
As shown in fig. 3, in the present exemplary embodiment, the stationary contact assembly may include a first conductive portion 13 and a second conductive portion 14, where the first conductive portion 13 and the second conductive portion 14 extend along a first direction X and are disposed opposite to each other in the first direction X, one end of the first conductive portion 13 away from the second conductive portion 14 is connected to the load 100 of the circuit, one end of the second conductive portion 14 away from the first conductive portion 13 is connected to the arc absorption circuit 301, and a gap is formed between opposite ends of the first conductive portion 13 and the second conductive portion 14 by a preset distance. The first conductive portion 13 and the second conductive portion 14 may be conductive sheets with contacts, and in an initial state, the first conductive portion 13 and the second conductive portion 14 are located in the same plane, and a certain distance is formed between the first conductive portion 13 and the second conductive portion 14, so that a gap is formed, and the gap can be used for attracting a magnet moving by the movable contact assembly to pass through.
As shown in fig. 3, in the present exemplary embodiment, the support assembly may include a first support bar 13 positioned at the first conductive portion 13 and a second support bar 14 positioned at the second conductive portion 14, each of the first support bar 13 and the second support bar 14 extending in a second direction Y intersecting the first direction X. The first direction X may be a horizontal direction, and the second direction Y may be a vertical direction. In the present exemplary embodiment, the first support bar 13 and the second support bar 14 constituting the support assembly are each an insulating material. The first supporting part can be fixed on the first conductive part 13, the second supporting part can be fixed on the second conductive part 14, the stability of the supporting rod is improved, and the magnetic switch NO3 is prevented from being attracted or disconnected to a certain extent due to shaking generated in the moving process of the movable contact assembly. The fixing manner of the support bar and the conductive portion may be, for example, gluing, etc., and the fixing manner of the support bar and the conductive portion is not limited in the present disclosure.
As shown in fig. 3, in the present exemplary embodiment, the fixing base 9 is fixed to one end of the first and second support bars 13 and 14 away from the stationary contact assembly, and a portion of the fixing base 9 between the first and second support bars 13 and 14 has a screw hole 91. The fixing base 9 is a strip-shaped fixing member fixed on the direct current contactor, and the fixing base 9 is made of insulating materials. The fixing base 9 may be integrally formed with the first support bar 13 and the second support bar 14, and of course, in other exemplary embodiments, the fixing base 9 and the first support bar 13 and the second support bar 14 may be separately formed. In addition, the fixing manner of the fixing base 9 and the first and second support rods 13 and 14 is not limited in the present disclosure. The middle part of the component is provided with a screw hole 91, the adjusting screw is provided with threads, and the adjusting screw is arranged in the screw hole 91 of the fixed seat 9.
As shown in fig. 3, in the present exemplary embodiment, the movable contact assembly is located between the fixed base 9 and the stationary contact, and the movable contact assembly may include a third conductive portion 15 and a driving portion, where the third conductive portion 15 extends along the first direction X and is sleeved on the first support rod 13 and the second support rod 14 through corresponding openings; the driving part extends along the second direction Y, one end of the driving part is connected with the fixing seat 9, the other end of the driving part is connected with the conductive part, and the driving part is used for applying an acting force to the third conductive part 15 when the third conductive part 15 leaves the initial position, and the acting force is used for driving the third conductive part 15 to return to the initial position. The third conductive portion 15 may be a metal conductive sheet with a contact, and the third conductive portion 15 may be made of iron or nickel metal, which may be attracted by a magnet. The third conductive part 15, the first conductive part 13 and the second conductive part 14 form a normally open switch. When the third conductive portion 15 is moved in a direction away from the fixing base 9 by the magnetic attraction force and is in contact with the first conductive portion 13 and the second conductive portion 14, the magnetic switch NO3 is closed. When the third conductive portion 15 is separated from the first conductive portion 13 and the second conductive portion 14, the magnetic switch NO3 is turned off. In this exemplary embodiment, the driving portion may include a first spring 16 and a second spring 17, where the first spring 16 is sleeved on the first supporting rod 13, the second spring 17 is sleeved on the second supporting rod 14, two ends of the first spring 16 are correspondingly connected with the fixing seat 9 and the third conductive portion 15, and similarly, two ends of the second spring 17 are correspondingly connected with the fixing end and the third conductive portion 15, the third conductive portion 15 is naturally suspended on the two springs, and the third conductive portion 15 can move back and forth along the two supporting rods, so that the two springs stretch together. When the third conductive part 15 is moved away from the initial position, the first spring 16 and the second spring 17 apply a reverse force to the third conductive part 15, which is used to drive the third conductive part 15 to return to the initial position. For example, when the electromagnetic coil 400 of the dc contactor is powered on, the third conductive part 15 is separated from the initial position by the external magnetic attraction force, so that the magnetic switch is turned on, and after the electromagnetic coil 400 is powered off, the external magnetic attraction force is eliminated, and the third conductive part 15 is restored to the initial position by the first spring 16 and the second spring 17.
As shown in fig. 3, in the present exemplary embodiment, the magnet assembly 18 may be movable along the second direction Y, the magnet assembly 18 may include a magnet 181 and a magnet mounting seat 182, the magnet 181 faces the gap between the first conductive portion 13 and the second conductive portion 14, and a dimension d4 of the magnet 181 in the first direction X is less than or equal to a width d3 of the gap in the first direction X; the magnet mount 182 includes a first blocking portion 183 extending in the first direction X and a second blocking portion 184, the first blocking portion 183 being located on the side of the first conductive portion 13 and overlapping the first conductive portion 13 in the first direction X, the second blocking portion 184 being located on the side of the second conductive portion 14 and overlapping the second conductive portion 14 in the first direction X. The magnet assembly 18 is connected to the drive of the dc contactor and moves with the movement of the armature in synchronism with the main switch NO1 and the auxiliary switch NO 2. When the electromagnetic coil 400 of the contactor is powered, the armature of the direct current contactor drives the armature to move under the action of the magnetic force of the electromagnetic coil 400, the magnet assembly 18 moves towards the gap between the first conductive part 13 and the second conductive part 14, when the magnet assembly 18 moves to be close to the third conductive part 15, the generated magnetic attraction attracts the third conductive part 15 to move towards the first conductive part 13 and the second conductive part 14, and when the third conductive part 15 contacts the first conductive part 13 and the second conductive part 14, the magnetic switch is closed. It should be understood that contacts are provided on both the side of the first conductive portion 13 facing the third conductive portion 15 and the side of the second conductive portion 14 facing the third conductive portion 15, and similarly, contacts are provided at positions where the third conductive portion 15 faces the contacts of the first conductive portion 13 and the contacts of the second conductive portion 14. In the present exemplary embodiment, the first blocking portion 183 on the magnet mount 182 overlaps the first conductive portion 13 in the first direction X, and the second blocking portion 184 overlaps the second conductive portion 14 in the first direction X, such that the first blocking portion 183 and the second blocking portion 184 can limit the movement of the magnet assembly 18. When the first blocking portion 183 contacts the first conductive portion 13 and the second blocking portion 184 contacts the second conductive portion 14, the magnet assembly 18 is at the attraction stop. In addition, when the magnet assembly 18 is at the attraction stop, the attraction force of the magnet 181 to the third conductive part 15 is greater than the acting force of the driving part to the third conductive part 15, so that the third conductive part 15 is in stable contact with the first conductive part 13 and the second conductive part 14, and the magnetic switch is closed. Further, in the present exemplary embodiment, the magnet 181 of the magnet assembly 18 may be a permanent magnet 181.
As shown in fig. 3, in the present exemplary embodiment, the magnetic switch NO3 may further include an adjusting screw 10, where a radial dimension of the adjusting screw 10 is matched with a hole diameter of the screw hole of the fixing base 9, an end of the adjusting screw 10 away from the third conductive portion 15 is provided with a notch 101, and the adjusting screw 10 is used to adjust an initial position of the third conductive portion 15 so that an initial distance between the third conductive portion 15 and the stationary contact assembly matches a preset distance. The radial dimension of the adjusting screw 10 is the dimension of the adjusting screw 10 in the first direction X. The end of the adjusting screw 10 far from the third conductive part 15, i.e. the top, is provided with a notch 101, which facilitates the rotational adjustment of the adjusting screw 10. By rotating the adjusting screw 10, the position of the third conductive part 15 can be adjusted such that the initial distance of the third conductive part 15 from the stationary contact assembly matches the preset distance.
The teaching process of the magnetic switch NO3 is specifically described below with reference to the accompanying drawings. Before the adjustment, the third conductive part 15 is naturally suspended on the first spring 16 and the second spring 17, but this natural position where the third conductive part 15 is located does not necessarily meet the design requirements, and thus the adjustment is required. As shown in fig. 4, the dc contactor is first attracted, at this time, the magnet assembly 18 is pushed by the dc contactor transmission mechanism to reach the attraction point, because the third conductive part 15 is far away from the magnet assembly 18 and cannot be attracted, at this time, the adjusting screw 10 can be rotated in a certain direction by a straight line at the notch 101 of the adjusting screw 10, the adjusting screw 10 pushes the third conductive part 15 to move toward the direction of the magnet assembly 18 (Y1 direction in fig. 5), until the third conductive part 15 is attracted by the magnet assembly 18 and is closed with the stationary contact assembly of the magnetic switch NO3, at this time, the state of the magnetic switch is as shown in fig. 5, the third conductive part 15 is closed with the first conductive part 13 and the second conductive part 14, and at this time, the magnetic force is far greater than the tensile force of the first spring 16 and the second spring 17. Then the contactor is opened, the magnet assembly 18 starts to return (move along the Y1 direction in fig. 6), as shown in fig. 6, although the magnet assembly 18 is separated from the third conductive part 15 by a distance, the magnetic force is still greater than the tensile force of the first spring 16 and the second spring 17, so that the third conductive part 15 is still attracted, the moving contact assembly and the stationary contact assembly of the magnetic switch NO3 are still in the closed state (when the main switch NO1 is separated), until the tensile force of the first spring 16 and the second spring 17 is greater than the magnetic force, finally the third conductive part 15 returns to the calibrated position, the magnet assembly 18 also returns to the release end point, when the state of the magnetic switch is shown in fig. 7, the third conductive part 15 is at the initial position, and when the position of the third conductive part 15 is changed compared with the position of the first conductive part 15 after the teaching, the position of the third conductive part 15 meets the design requirement can be seen by comparing fig. 4 and 7. It can be seen that the contacts of the magnetic switch NO3 are closed after the main switch NO1 is closed, and are separated after the main switch NO1 is separated.
Fig. 8 is a timing chart of a dc contactor engaging process according to an embodiment of the present disclosure, when the contactor electromagnetic coil 400 is powered on, the voltage on the contactor electromagnetic coil 400 is applied to both ends of the first resistor R1 and the P1 and P2 of the optocoupler OP at the same time, so that the light emitting diode inside the optocoupler OP emits light, the optocoupler OP is turned on, and at the same time, the armature of the contactor electromagnetic mechanism starts to move, as shown in the above embodiment, the auxiliary switch NO2 is closed before the main switch NO1, the dc power supply charges the first capacitor C1 through the load 100 of the circuit, the auxiliary switch NO2, and the P4 and P3 pins of the second resistor R2, and when the voltage of the first capacitor C1 reaches the trigger voltage of the SCR, the SCR is turned on, and since the SCR is turned off at the moment when the auxiliary switch NO2 is closed, the SCR is not turned on, and NO arc or spark is generated. The duration of the pull-in of the dc contactor is generally about tens to hundreds of milliseconds, the time t for the voltage on the first capacitor C1 to reach the trigger voltage of the SCR can be designed to be 1 to several milliseconds, and the value of C1 can be calculated by the formula rc=t/ln [ V1/(V1-Vt) ] in combination with the required size of the current limiting second resistor R2, where V1 is the supply voltage, and Vt is the voltage on the first capacitor C1 over the time t. After that, the SCR is turned on, and the voltage between the movable contact of the main switch NO1 and the stationary contact of the main switch NO1 is equal to the voltage drop of the tube on the SCR, and the value is very low. The armature of the electromagnetic mechanism of the contactor continues to move until the main switch NO1 is closed, and NO arc or spark is generated when the main switch NO1 is closed because the voltage drop between the contacts is low. At this time, the main circuit is turned on, so that the SCR is turned off because the current flowing through the SCR returns to zero.
After the main switch NO1 is closed, the contact of the magnetic switch NO3 is closed, and the second capacitor C2 is connected with the main switch NO1 in parallel.
Fig. 9 is a timing chart of a dc contactor release process according to an embodiment of the present disclosure, when the contactor electromagnetic coil 400 is de-energized, the light emitting diode inside the optocoupler OP is turned off, and at the same time, the armature of the contactor electromagnetic mechanism starts to return under the action of the spring force, as can be seen from the above example, when the contactor electromagnetic coil 400 is de-energized, the main switch NO1 is turned off before the auxiliary switch NO 2. When the main switch NO1 is turned off, the second capacitor C2 is directly connected in parallel to the two ends of the main switch NO1, and the voltage on the second capacitor C2 is 0 and cannot be suddenly changed, so that NO arc or spark is generated at the moment when the main switch NO1 is turned off. Thereafter, the magnetic switch NO3 is turned off, the second capacitor C2 is disconnected from the parallel connection position of the main switch NO1, and the third resistor R3 discharges the voltage existing in the second capacitor C2. The armature of the electromagnetic mechanism of the direct current contactor continues to return under the action of the spring force, so that the auxiliary switch NO2 is opened. Since the optocoupler OP is turned off immediately after the contactor solenoid 400 is deenergized, the SCR is turned off, and NO current passes, an arc or spark is not generated even when the auxiliary switch NO2 is turned off. The armature of the electromagnetic mechanism of the direct current contactor continues to return under the action of the spring force until the end position is released.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. A dc contactor comprising a control loop connected in series between two electrodes of the contactor, the control loop comprising:
the main switch comprises a movable contact and a fixed contact, wherein the movable contact of the main switch is connected with one electrode of the contactor, and the fixed contact of the main switch is connected with the other electrode of the contactor;
the auxiliary switch comprises a movable contact and a fixed contact, wherein the movable contact of the auxiliary switch is connected with one electrode of the contactor, the fixed contact of the auxiliary switch is connected with a first end of a first arc-extinguishing circuit, a second end of the first arc-extinguishing circuit is connected with the other electrode of the contactor, a control end of the first arc-extinguishing circuit is connected with an electromagnetic coil of the contactor, and the distance between the movable contact and the fixed contact of the auxiliary switch is smaller than that between the movable contact and the fixed contact of the main switch; the first arc extinguishing circuit is at least used for delaying connection between the fixed contact of the auxiliary switch and the other electrode of the contactor after a first preset time length when the movable contact of the auxiliary switch is contacted with the fixed contact;
The second arc extinguishing circuit comprises a magnetic switch and an arc absorption circuit, one end of the magnetic switch is connected with one electrode of the contactor, the other end of the magnetic switch is connected with the first end of the arc absorption circuit, the second end of the arc absorption circuit is connected with the other electrode of the contactor, the magnetic switch is at least used for being closed after a second preset time period when the main switch is closed and being opened after a third preset time period when the main switch is opened, and the arc absorption circuit is at least used for absorbing voltages at two ends of the main switch when the main switch is opened.
2. The direct current contactor according to claim 1, wherein said first arc suppressing circuit comprises:
the first end of the controllable silicon is used as the first end of the first arc extinguishing circuit, the second end of the controllable silicon is used as the second end of the first arc extinguishing circuit, and the control end is connected with a delay circuit;
the delay circuit comprises a first capacitor and a switch unit, wherein one end of the first capacitor is connected with the control end of the controllable silicon, and the other end of the first capacitor is connected with the other electrode of the contactor; the first end of the switch unit is connected with the first end of the controllable silicon, the second end of the switch unit is connected with the control end of the controllable silicon, and the control end is used as the control end of the first arc extinguishing circuit;
The delay circuit is used for responding to the signal of the electromagnetic coil to delay the first end and the second end of the controllable silicon after the first preset time length.
3. The direct current contactor according to claim 2, wherein said switching unit comprises:
the optocoupler comprises a light emitting piece and a light receiving piece, wherein two ends of the light emitting piece are used as control ends of the switch unit, a first pole of the light receiving piece is used as a first end of the switch unit, and a second pole of the light receiving piece is used as a second end of the switch unit.
4. A dc contactor according to claim 3, wherein said delay circuit further comprises:
the first resistor is connected in series with a connecting loop of the luminous piece of the optocoupler and the electromagnetic coil;
and the second resistor is connected between the first pole of the light receiving element of the optocoupler and the first end of the silicon controlled rectifier.
5. The direct current contactor according to claim 1, wherein said arc absorption circuit comprises:
a second capacitor, one end of which is used as a first end of the arc absorption circuit, and the other end of which is used as a second end of the arc absorption circuit;
and the third resistor is connected in parallel with two ends of the second capacitor.
6. The direct current contactor according to claim 1, wherein said magnetic switch comprises:
the static contact assembly comprises a first conductive part and a second conductive part, wherein the first conductive part and the second conductive part extend along a first direction and are opposite to each other in the first direction, one end of the first conductive part far away from the second conductive part is connected with one electrode of the contactor, one end of the second conductive part far away from the first conductive part is connected with a first end of the arc absorption circuit, and a gap is formed between opposite ends of the first conductive part and the second conductive part at a preset distance;
the support assembly comprises a first support rod positioned at the first conductive part and a second support rod positioned at the second conductive part, wherein the first support rod and the second support rod extend along a second direction, and the second direction is intersected with the first direction;
the fixed seat is fixed at one end of the first support rod and one end of the second support rod, which are far away from the fixed contact assembly, and a screw hole is formed in the part, located between the first support rod and the second support rod, of the fixed seat;
the movable contact point assembly is positioned between the fixed seat and the fixed contact point, and comprises a third conductive part and a driving part, wherein the third conductive part extends along the first direction and is sleeved on the first support rod and the second support rod through corresponding holes; the driving part extends along the second direction, one end of the driving part is connected with the fixing seat, the other end of the driving part is connected with the third conductive part, the driving part is used for applying an acting force to the third conductive part when the third conductive part leaves the initial position, and the acting force is used for driving the third conductive part to return to the initial position.
7. The dc contactor as claimed in claim 6, wherein said magnetic switch further comprises:
the magnet assembly moves along the second direction and comprises a magnet and a magnet mounting seat, the magnet faces the notch, and the size of the magnet in the first direction is smaller than or equal to the width of the notch in the first direction; the magnet mounting seat comprises a first blocking portion and a second blocking portion, wherein the first blocking portion extends along the first direction, the first blocking portion is located on one side of the first conductive portion and overlaps the first conductive portion in the first direction, and the second blocking portion is located on one side of the second conductive portion and overlaps the second conductive portion in the first direction.
8. The direct current contactor according to claim 7, wherein when the first blocking portion contacts the first conductive portion and the second blocking portion contacts the second conductive portion, a suction force of the magnet to the third conductive portion is greater than a force of the driving portion to the third conductive portion.
9. The direct current contactor according to claim 7, wherein the driving part includes:
The first spring is sleeved on the first supporting rod, and two ends of the first spring are correspondingly connected with the fixing seat and the third conductive part;
the second spring is sleeved on the second supporting rod, and two ends of the second spring are correspondingly connected with the fixing seat and the third conductive part.
10. The dc contactor as claimed in claim 7, wherein said magnetic switch further comprises:
the radial dimension of the adjusting screw is matched with the aperture of the screw hole of the fixing seat, a notch is formed in the end portion, away from the third conductive portion, of the adjusting screw, and the adjusting screw is used for adjusting the initial position of the third conductive portion, so that the initial distance between the third conductive portion and the stationary contact assembly is matched with a preset distance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111214971.2A CN113963990B (en) | 2021-10-19 | 2021-10-19 | DC contactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111214971.2A CN113963990B (en) | 2021-10-19 | 2021-10-19 | DC contactor |
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| CN113963990B true CN113963990B (en) | 2024-01-02 |
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| CN216851804U (en) * | 2021-09-09 | 2022-06-28 | 株洲福德轨道交通研究院有限公司 | Processing device for output excitation of grid-connected converter |
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| CN2359792Y (en) * | 1999-02-08 | 2000-01-19 | 刘华民 | Active arc-control device |
| WO2011034140A1 (en) * | 2009-09-16 | 2011-03-24 | 株式会社ワイ・ワイ・エル | Switch |
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| CN113963990A (en) | 2022-01-21 |
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