CN110349799B - Vacuum switch and related mechanism, system and application - Google Patents

Vacuum switch and related mechanism, system and application Download PDF

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Publication number
CN110349799B
CN110349799B CN201910105419.6A CN201910105419A CN110349799B CN 110349799 B CN110349799 B CN 110349799B CN 201910105419 A CN201910105419 A CN 201910105419A CN 110349799 B CN110349799 B CN 110349799B
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China
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closing
opening
magnet
switch
vacuum switch
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CN110349799A (en
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李俭华
余振
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Anhui Hekai Electrical Technology Co ltd
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Anhui Hekai Electrical Technology Co ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66Vacuum switches
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66Vacuum switches
    • H01H33/664Contacts; Arc-extinguishing means, e.g. arcing rings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66Vacuum switches
    • H01H33/666Operating arrangements

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

The invention discloses a vacuum switch, related mechanism, system and application, the vacuum switch holding mechanism includes: the magnetic conductive suction plate is fixedly connected with a central shaft rod of the vacuum switch and is attracted with the closing magnet or the opening magnet under the driving of the central shaft rod. The invention solves the problems of long opening and closing time and low speed of the vacuum switch in the prior art.

Description

Vacuum switch and related mechanism, system and application
Technical Field
The invention relates to a vacuum switch and related mechanisms, systems and applications.
Background
The Vacuum switch (Vacuum circuit breaker) in the prior art has the advantages of small volume, light weight, suitability for frequent operation and no maintenance for arc extinction, is relatively popularized in power distribution networks, can be used for protecting and controlling electrical equipment in industrial and mining enterprises, power plants and transformer substations, is particularly suitable for use places requiring no oil, less maintenance and frequent operation, and can be configured in a middle cabinet, a double-layer cabinet and a fixed cabinet to be used for controlling and protecting high-voltage electrical equipment. The traditional vacuum switch generally adopts a spring operating mechanism, the switching-off and switching-on time is long, the pre-breakdown time is long, the electric arc exists for a long time, the surface of a contact is greatly electrically abraded, and even the contact is stuck by fusion welding, so that the electric service life of an arc extinguish chamber is shortened.
Disclosure of Invention
In view of the technical shortcomings and drawbacks of the prior art, embodiments of the present invention provide a vacuum switch and associated mechanisms, systems and applications that overcome or at least partially address the above-mentioned problems.
The invention relates to a vacuum switch holding mechanism, which comprises a closing magnet, a breaking magnet and a magnetic conductive suction plate, wherein the magnetic conductive suction plate is fixedly connected with a central shaft rod of the vacuum switch and is attracted with the closing magnet or the breaking magnet under the driving of the central shaft rod.
In one embodiment, the closing and opening magnets include a yoke, a permanent magnet received in the yoke, and a stainless steel skeleton fixed to an inner surface of the yoke.
In one embodiment, the permanent magnets are multiple in number and are annularly arranged in the accommodating groove of the magnet yoke at equal intervals.
In one embodiment, the closing magnet and the opening magnet are fixed to an upper base plate of the vacuum switch base through a support rod.
In one embodiment, a second support sleeve is defined between the closing magnet and the opening magnet, and passes through the support rod.
In one embodiment, a through hole is formed in a position of the magnetic conductive suction plate corresponding to the second support sleeve, and the second support sleeve is accommodated in the through hole.
In one embodiment, the distance between the closing magnet and the opening magnet is equal to the stroke of the magnetic conductive suction plate.
In one embodiment, the holding mechanism further comprises an opto-electronic switch fixed to the closing magnet and/or the yoke of the opening magnet.
In one embodiment, the closing magnet and/or the opening magnet are provided with a threaded hole for fixing a photoelectric switch on the side surface of a magnetic yoke, and the photoelectric switch is fixed on the side surface of the magnetic yoke.
In one embodiment, the holding mechanism further comprises a signal conversion module in signal connection with the optoelectronic switch, and is used for converting the optoelectronic signal received by the optoelectronic switch into a level signal suitable for an external control module.
In one embodiment, the magnetic flux of the closing magnet is greater than the magnetic flux of the opening magnet.
In one embodiment, the middle of the outer surface of the permanent magnet is recessed inwards, and the stainless steel skeleton is provided with a barrier strip corresponding to the outside of the recessed middle of the permanent magnet to fix the permanent magnet in the magnetic yoke.
As a second aspect of the embodiment of the present invention, there is provided a vacuum switch including the above-described holding mechanism.
In one embodiment, the vacuum switch further comprises: the device comprises a base, a vacuum arc extinguish chamber, a driving mechanism, a buffer mechanism and a switching power supply;
a static contact and a moving contact are arranged in the vacuum arc extinguish chamber;
the holding mechanism is arranged below or above the driving mechanism;
the buffer mechanism is arranged above the driving mechanism and the holding mechanism;
the vacuum arc extinguish chamber, the driving mechanism, the retaining mechanism, the buffer mechanism and the switching power supply are fixed on the base.
In one embodiment, the drive mechanism comprises: the vortex disc is fixedly connected with the middle shaft rod.
In one embodiment, the switching-off coil or the switching-on coil generates a magnetic field under the driving of a switching power supply, a repulsive force is generated between the switching-off coil or the switching-on coil and the vortex disc, and the vortex disc is driven to move towards a direction far away from the switching-off coil or the switching-on coil, so that the central shaft rod is driven to move up and down.
In one embodiment, the opening coil, the vortex disc and the closing coil are all circular, and the centers of the circles are located on the same straight line.
In one embodiment, the opening coil and the closing coil are fixed to an upper base plate of the vacuum switch base through a support rod.
In one embodiment, the distance between the closing coil and the opening coil is larger than the stroke of the vortex disc.
In one embodiment, the damping mechanism comprises: the top of a middle shaft rod of the driving mechanism is in elastic contact with the elastic component in the cavity of the insulating buffer; and driving the insulation buffer to move up and down.
In one embodiment, the insulating bumper includes: insulator, moving contact mounting at insulator top, the inserts of insulator bottom, the cock of being connected with inserts fixed connection.
In one embodiment, the middle shaft rod comprises a rod body and a boss at the top of the rod body, a through hole is formed in the bottom surface of the plug, the rod body of the middle shaft rod penetrates through the through hole, and the boss of the middle shaft rod is accommodated in the plug.
In one embodiment, the switching power supply includes: the rapid charging switch power supply, the opening capacitor bank, the closing capacitor bank, the diode, the opening power electronic switch and the closing power electronic switch;
the switching-on and switching-off capacitor bank is connected with the negative electrode of the rapid charging switching power supply; the positive electrodes of the opening and closing capacitor banks are respectively connected with the positive electrode of the rapid charging switching power supply through diodes, and the positive electrodes of the opening and closing capacitor banks are respectively connected with the positive electrodes of the opening and closing power electronic switches;
cathodes of the opening and closing power electronic switches are respectively connected with inlet ports of opening and closing coils of the vacuum switch, and cathodes of the opening and closing capacitor banks are respectively connected with outlet ports of the opening and closing coils of the vacuum switch;
the pulse output of the rapid charging switch power supply is respectively connected with the control electrodes of the switch-on and switch-off power electronic switches; the rapid charging switch power supply receives an external driving signal and controls the switch-on and switch-off of the switch-on and switch-off power electronic switch.
As a third aspect of the embodiment of the present invention, it relates to an electric system to which the above-described vacuum switch is applied.
As an aspect of an embodiment of the present invention, it relates to the use of the vacuum switch described above in a power distribution network.
The embodiment of the invention at least realizes the following technical effects:
1. according to the holding mechanism of the vacuum switch provided by the embodiment of the invention, the holding mechanism attracts and closes the magnetic conductive suction plate through the closing magnet and the opening magnet, so that the middle shaft rod is kept in a stable state, the stability of the mechanism during opening and closing is ensured, and the movable contact and the fixed contact of the vacuum switch are stably contacted, and the holding mechanism has a simple structure and a good control effect; when the middle shaft rod moves to drive the magnetic conduction suction plate to attract the switch-on magnet or the switch-off magnet, impact force generated by rapid movement of the magnetic conduction suction plate is transmitted to the base of the vacuum switch, vibration of the middle shaft rod is reduced, and contact stability of the movable contact and the static contact is further ensured.
2. According to the vacuum switch provided by the embodiment of the invention, the magnetic field is generated by electrifying the opening/closing coil, the repulsion force is generated between the opening/closing coil and the vortex disc, the middle shaft rod is driven to move up and down, the opening and closing of the vacuum switch are realized, the moving contact and the static contact of the vacuum switch are high in opening and closing action speed, small in movement inertia and high in opening and closing efficiency, the opening and closing time is reduced, the vacuum switch can be suitable for the opening and closing of the quick vacuum switch, the control precision is high, the pre-breakdown time is short, the electric arc existence time is short, the electric abrasion on the surface of the contact is small, and the service life of the vacuum switch is prolonged.
3. According to the vacuum switch provided by the embodiment of the invention, the elastic component in the cavity of the buffer of the buffer mechanism is matched with the middle shaft rod, the movable contact and the static contact of the vacuum switch are controlled to be contacted through the compression and the extension of the elastic component, the bounce time and the bounce frequency of the movable contact and the static contact can be reduced during switching-on, the movable contact and the static contact can be quickly separated during switching-off, and the phenomenon of arc fusion welding and damage to the vacuum arc extinguish chamber can be prevented.
4. According to the vacuum switch provided by the embodiment of the invention, the voltage control precision of the switching power supply is high, the voltage output is stable, the ripple factor is small, no voltage overcharge phenomenon exists, the driving stability of the vacuum switch is ensured, and the switching-on and switching-off operations of the vacuum switch are smoothly realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a first schematic structural diagram of a vacuum switch according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a vacuum switch according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a driving mechanism of a vacuum switch according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a holding mechanism of a vacuum switch according to an embodiment of the present invention.
Fig. 5 is an electrical schematic diagram of an optoelectronic switch of a vacuum switch holding mechanism according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a buffering mechanism of a vacuum switch according to an embodiment of the present invention.
Fig. 7 is an electrical schematic diagram of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 8 is a charging circuit diagram of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 9 is a circuit diagram of an output protection and energy recovery circuit of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 10 is a circuit diagram of a power supply control PWM of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 11 is a circuit diagram of an intermittent adjustment circuit of a switching power supply of a vacuum switch according to an embodiment of the present invention.
FIG. 12 is a voltage trickle complement circuit diagram of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 13 is a circuit diagram of monitoring an opening/closing voltage of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 14 is a circuit diagram of a thyristor trigger circuit of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Fig. 15 is a circuit diagram of a trigger lock-out circuit of a switching power supply of a vacuum switch according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be 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 scope of the disclosure to those skilled in the art.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various embodiments of the vacuum switch and related mechanisms, systems and applications provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
An embodiment of the present invention provides a vacuum switch, as shown in fig. 1 and 2, including: the device comprises a base 1, a vacuum arc extinguish chamber 2 fixed on the upper part of the base 1, a driving mechanism 3 fixed on the base 1, a holding mechanism 4, a buffer mechanism 5 and a switching power supply 6. A static contact (not shown in the figure) and a moving contact 201 are arranged in the vacuum arc extinguish chamber 2; the holding mechanism 4 is arranged below or above the driving mechanism 3; the buffer mechanism 5 is arranged above the driving mechanism 3 and the holding mechanism 4; the vacuum arc extinguishing 2, the driving mechanism 3, the holding mechanism 4, the buffer mechanism 5 and the switching power supply 6 are all fixed on the base 1.
In a specific embodiment, the vacuum switch further comprises: the vacuum switch comprises a conductive clamp 7 connected with a moving contact of the vacuum switch and a flexible connecting lead 8 connected with the conductive clamp 7, wherein the flexible connecting lead 8 is connected to a voltage input end through a conductive copper bar 9; the vacuum switch also comprises an upper wire outlet base 10 connected to the top of the vacuum arc extinguish chamber, and when the vacuum switch is switched on, voltage is output outwards through the upper wire outlet base 10. The vacuum switch further comprises a post insulator 11, and the vacuum arc-extinguishing chamber 2 is fixed on the base 1 through the post insulator 11.
Referring to fig. 1, the base includes an upper base plate 110, a lower base plate 120, and a support holder 130 to which the upper base plate 110 and the lower base plate 120 are fixed. Specifically, for example, a plurality of screw holes may be provided at corresponding positions of the upper base plate 110 and the lower base plate 120, both ends of the support fixing frame 130 may be provided with threads, and the upper base plate 110 and the lower base plate 120 may be fixed to the support fixing frame by bolts passing through the screw holes of the upper base plate and the lower base plate. It should be noted that the supporting and fixing frame 130 of the base 1 is made of an insulating material, or the outer layer of the supporting and fixing frame 130 is wrapped by the insulating material.
Referring to fig. 1 to 3, the driving mechanism 3 of the vacuum switch includes: the vortex disc 340 is fixedly connected with the middle shaft rod 330, through holes are formed in the middle parts of the opening coil 310 and the closing coil 320, and the rod body of the middle shaft rod 330 penetrates through the through holes in the middle parts of the opening coil 310 and the closing coil 320.
In the vacuum switch provided by the embodiment of the invention, the opening coil 310 or the closing coil 320 generates a magnetic field under the driving of the switching power supply 6, a repulsive force is generated between the opening coil 310 or the closing coil 320 and the vortex disc 340, and the vortex disc 340 is driven to move in a direction away from the opening coil 320 or the closing coil 310, so as to drive the middle shaft rod 330 to move up and down. The driving mechanism generates a magnetic field through the electrification of the separation/closing coil, generates repulsion force between the driving mechanism and the vortex disc, and drives the middle shaft rod to move up and down to realize the opening and closing of the vacuum switch, the moving contact and the static contact of the vacuum switch are high in opening and closing action speed, small in movement inertia and high in opening and closing efficiency, the opening and closing time is reduced, the vacuum switch can be suitable for the quick opening and closing of the vacuum switch, the control precision is high, the pre-breakdown time is short, the time of electric arc existence is short, the electric abrasion on the surface of the contact is small, and the service life of the vacuum switch is prolonged.
The base 1 further includes a support bar 140, and the opening coil 310 and the closing coil 320 are fixed to the upper base plate 110 of the vacuum switch base 1 through the support bar 140. Specifically, the support rod 140 may be fixed to an upper base plate of the base by a bolt, and the support rod 140 includes an upper insulating rod and a lower connecting screw rod, and the upper insulating rod is connected to the lower connecting screw rod by a thread; the opening coil 310 and the closing coil 320 are symmetrically provided with at least two through holes, respectively, and the opening coil 310 and the closing coil 320 penetrate through the connecting screw of the support rod 140 and are fixed on the connecting screw of the support rod 140 through a fixing nut.
In one embodiment, it may be that, as shown in fig. 2, when the opening coil 310 and the closing coil 320 are fixed to the support bar 140, a first support sleeve 350 is disposed between the opening coil 310 and the closing coil 320 to define a distance between the opening coil 310 and the closing coil 320.
In one embodiment, for example, the opening coil 310, the vortex plate 340 and the closing coil 320 are all circular and have the same center on the same straight line.
The diameter of the circular vortex disk 340 in the embodiment of the present invention may be selected according to the weight of the whole device of the vacuum switch, and the larger the diameter of the vortex disk 340 is, the smaller the induction inductance value generated by cutting magnetic lines is, and the larger the acting force between the vortex disk 340 and the closing coil 320 or the opening coil 310 is, the smaller the energy loss is, so that the diameter of the vortex disk 340 meets the opening and closing requirements of the vacuum switch, which is not limited in the embodiment of the present invention.
The body of rod of well axostylus axostyle 330 is provided with the screw thread, and threaded connection is fixed with first axle sleeve 360 on well axostylus axostyle 330, and first axle sleeve 360 is "protruding" style of calligraphy, and the surface of first axle sleeve 360 is equipped with the screw thread, and the middle part through-hole of vortex dish 340 passes after well axostylus axostyle 330 to be fixed in first axle sleeve 360 through at least one first fixation nut 370. The contact area between the first shaft sleeve 360 and the middle shaft rod 330 is large, so that the first fixing nut 370 is prevented from loosening or sliding due to large impact force on the vortex disc 340 in the switching-on and switching-off processes, and the service life of the driving mechanism 3 is prolonged.
In one embodiment, for example, the vortex disk 340 may be made of a metal magnetic material, such as aluminum, copper, or other metal magnetic materials.
In one embodiment, the opening coil 310 and the closing coil 320 include a wire winding and an outer insulating plate accommodating the wire winding. Specifically, the outer insulating plate may be an epoxy resin plate, and the wire winding is fixed to the epoxy resin plate by epoxy resin glue.
Referring to fig. 1, 2 and 4, the holding mechanism 4 of the vacuum switch includes: the magnetic switch comprises a closing magnet 410, an opening magnet 420 and a magnetic conductive suction plate 430 fixedly connected with a central shaft rod 330, wherein the magnetic conductive suction plate 430 is attracted with the closing magnet 410 or the opening magnet 420 under the driving of the central shaft rod 330.
The vacuum switch attracts the magnetic conductive suction plate through the closing magnet and the opening magnet, so that the middle shaft rod is kept in a stable state, the stability of the mechanism during opening and closing is ensured, and the movable contact and the fixed contact of the vacuum switch are stable in contact, the structure is simple, and the control effect is good; when the middle shaft rod moves to drive the magnetic conduction suction plate to attract the switch-on magnet or the switch-off magnet, impact force generated by rapid movement of the magnetic conduction suction plate is transmitted to the base of the vacuum switch, vibration of the middle shaft rod is reduced, and contact stability of the movable contact and the static contact is further ensured.
Through holes are formed in the middle of the closing magnet 410 and the opening magnet 420, and the rod body of the middle shaft rod 330 penetrates through the through holes in the middle of the closing magnet 410 and the opening magnet 420. The closing magnet 410 and the opening magnet 420 are fixed to the upper base plate 110 of the vacuum switch base 1 through the support bar 140. The fixing manner of the closing magnet 410 and the opening magnet 420 may refer to the fixing manner of the opening coil 310 and the closing coil 320, and is not described in detail in the embodiment of the present invention.
In one embodiment, for example, when the closing magnet 410 and the opening magnet 420 are fixed to the support bar 140, a second support sleeve 440 is disposed between the closing magnet 410 and the opening magnet 420 to define a distance between the closing magnet 410 and the opening magnet 420.
In one embodiment, for example, a through hole is provided at a position of the magnetic attraction plate 430 corresponding to the second support sleeve 440, and the second support sleeve 440 is received in the through hole.
In an embodiment, the second shaft sleeve 450 is fixed on the middle shaft rod 330 in a threaded connection manner, and the fixing manner of the magnetic conductive attraction plate 430 and the middle shaft rod 330 may refer to the connection manner of the vortex disc 340 and the middle shaft rod 330, which is not described herein again in the embodiment of the present invention.
The opening coil 310, the vortex plate 340 and the closing coil 320 of the driving mechanism 3 in the embodiment of the present invention may be disposed above the holding mechanism 4 or below the holding mechanism 4, and this is not limited in the embodiment of the present invention.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 or 2, the support rod 140 sequentially passes through the closing magnet 410, the second support sleeve 440, the opening magnet 420, the opening coil 310, the first support sleeve 350, and the closing coil 320 from top to bottom, and finally the closing magnet 410, the second support sleeve 440, the opening magnet 420, the opening coil 310, the first support sleeve 350, and the closing coil 320 are fastened by the fixing nut.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 or fig. 2, at least one pre-pressing nut 390, a second bushing 450, a magnetically conductive suction plate 430, a first bushing 360, a vortex disc 340, at least one first fixing nut 370, and at least one locking nut 380 are fixed on the middle shaft rod from top to bottom in sequence. The at least one pre-pressing nut 390 is arranged on the middle shaft rod 330 to prevent the second shaft sleeve 450 from loosening and affecting the fixing effect of the magnetic conductive suction plate 430 in the use process of the vacuum switch; meanwhile, in order to prevent the first fixing nut 370 from loosening and affecting the fixing effect of the vortex disk 340, at least one locking nut 380 is fixed on the middle shaft 330, and the first fixing nut 370 is compressed.
In one embodiment, for example, as shown in fig. 4, an outwardly protruding extension portion is provided at one side of the magnetic conductive attraction plate 430, the extension portion of the magnetic conductive attraction plate 430 can extend between two adjacent support rods 140, and the rotation of the central shaft 330 is limited by two adjacent support rods 140, so that the central shaft 330 is prevented from driving the movable contact 210 of the vacuum switch to rotate when rotating, and the relative position relationship between the movable contact 210 and a stationary contact (not shown in the figure) is influenced, thereby causing a closing or opening failure.
In one embodiment, referring to fig. 4, the closing magnet 410 includes a closing yoke 4101, a closing permanent magnet 4102, and a closing stainless steel skeleton 4103; the opening magnet 420 comprises an opening magnetic yoke 4201, an opening permanent magnet 4202 and an opening stainless steel skeleton 4203; the number of the closing permanent magnets 4102 and the opening permanent magnets 4202 is plural, and the plural permanent magnets are respectively arranged in the accommodation grooves of the closing yoke 4101 and the opening yoke 4201 at equal intervals in a ring shape, the closing stainless steel frame 4103 is fixed to the inner surface of the closing yoke 4101, and the opening stainless steel frame 4203 is fixed to the inner surface of the opening yoke 4201.
In a specific embodiment, the number of the closing permanent magnets 4102 and the opening permanent magnets 4202 is even, and the permanent magnets are fan-shaped, the middle of the fan-shaped surface of each permanent magnet is recessed inwards, the stainless steel frame is provided with a spacer corresponding to the recess of the fan-shaped surface of the permanent magnet, and the permanent magnet is fixed in the magnetic yoke through the stainless steel frame.
The stainless steel skeleton 4103 and the stainless steel skeleton 4203 of the closing magnet 410 and the opening magnet 420 provided by the embodiment of the present invention are fixed to the yoke 4101 and the opening yoke 4201 by bolts, respectively.
The number of the closing permanent magnets 4102 and the opening permanent magnets 4202 in the closing magnet 410 and the opening magnet 420 provided by the embodiment of the present invention may be 6 or 8, and the closing permanent magnets 4102 and the opening permanent magnets 4202 are uniformly arranged in the closing yoke 4101 and the opening yoke 4201, so as to implement balanced control of a magnetic field, ensure that the moving contact 210 and a static contact (not shown in the figure) are contacted and connected at a central position during closing or opening, prevent the moving contact 210 from being welded on the static contact, and cause an opening fault, and prevent the magnetic field attenuation of the permanent magnets by uniformly arranging the permanent magnets.
In the embodiment of the present invention, when the magnetic conductive attraction plate 430 is attracted to the closing magnet 410 or the opening magnet 420 under the driving of the central shaft 330, the movement speed is fast, the impact force on the retaining mechanism 4 is large, and the generated vibration may break the closing permanent magnet 4102 or the opening permanent magnet 4202. By fixing the stainless steel skeleton 4103 and the stainless steel skeleton 4203 on the surfaces of the closing magnet 410 and the opening magnet 420, when the magnetic attraction plate 430 is attracted to the closing magnet 410 or the opening magnet 420, an impact force acts on the stainless steel skeleton 4103 or the stainless steel skeleton 4203 and is transmitted to the base 1 of the vacuum switch through the stainless steel skeleton 4103 or the stainless steel skeleton 4203, so that the vibration of the holding mechanism 4 is reduced, and the closing permanent magnet 4102 or the opening permanent magnet 4202 is prevented from being broken.
In the embodiment of the present invention, because the moving speed of the moving contact 210 is fast in the closing process of the vacuum switch, a reverse acting force is generated between the moving contact 210 and the fixed contact when the vacuum switch is closed, and the stress of the holding mechanism 4 in the closing state is greater than the stress in the opening state, in order to prevent the moving contact 210 from being separated from the fixed contact under the reverse acting force in the closing process and ensure the stress in the closing state to be stable, the attractive force between the magnetic conductive suction plate 430 and the closing magnet 410 can be greater than the attractive force between the magnetic conductive suction plate 430 and the opening magnet 420, that is, the magnetic flux of the closing magnet 410 is greater than the magnetic flux of the opening magnet 420.
In one embodiment, referring to fig. 1 or fig. 2, the holding mechanism 4 of the vacuum switch further includes an optical-to-electrical switch 460 and a signal conversion module 470 in signal connection with the optical-to-electrical switch 460. Specifically, the closing magnet 410 and the opening magnet 420 may be respectively provided with one photoelectric switch 460, the side surfaces of the yokes of the closing magnet 410 and the opening magnet 420 may be respectively provided with a screw hole for fixing the photoelectric switch 460, and the photoelectric switch 460 may be fixed to the side surfaces of the yokes. In the embodiment of the present invention, the signal conversion module 470 is configured to convert the optical electrical signal received by the optical electrical switch 460 into a level signal suitable for an external control module.
Referring to fig. 5, the photoelectric switch 460 provided in the opening and closing magnet according to the embodiment of the present invention is an NPN-type photoelectric sensor. When the photoelectric sensor does not receive light, the output is high level, the relay does not act, and the optical coupler is normally conducted; when the photoelectric sensor receives light, the output is low level, the relay acts to close, and the optical coupler is not conducted. The photoelectric switch may also be a PNP-type photoelectric sensor, and when the split-gate and the switch-on position detection is realized, the PNP-type photoelectric sensor and the NPN-type photoelectric sensor may be respectively set to a high-low level conversion output mode, and the position detection realization principle is similar, and is not described herein again.
Referring to fig. 1, 2 and 6, the damper mechanism 5 of the vacuum switch includes: an insulating buffer 510, an elastic member 520 disposed in the cavity of the insulating buffer 510, wherein the top of the middle shaft 330 is elastically contacted with the elastic member 520 in the cavity of the insulating buffer 510; wherein, the insulation buffer 510 includes: the insulator 5101, the moving contact fixing piece 5102 at the top of the insulator 5101, the insert 5103 at the bottom of the insulator 5101 and the cock 5104 are arranged, external threads are arranged on the outer wall of the hollow structure of the insert 5103, internal threads are arranged on the inner wall of the cock 5104, and the insert 5103 is in threaded connection with the cock 5104. The rod body of the middle shaft 330 passes through the through hole on the bottom surface of the plug 5104, and the boss of the middle shaft 330 is received in the plug 5104, and the middle shaft 330 moves to drive the insulating buffer 510 to move up and down.
The elastic component in the cavity of the buffer of the buffer mechanism of the vacuum switch is matched with the middle shaft rod, the movable contact and the static contact of the vacuum switch are controlled through the compression and the extension of the elastic component, the bounce time and the bounce frequency of the movable contact and the static contact can be reduced during switching-on, the movable contact and the static contact can be quickly separated during switching-off, and the phenomenon of electric arc fusion welding and damage to a vacuum arc extinguish chamber are prevented.
In one embodiment, the resilient member 520 within the cavity of the dielectric absorber 510 may be a coil spring or a plurality of stacked disc springs, with the end of the central shaft 330 projecting upward as a piston rod, around which the coil spring or the plurality of stacked disc springs surrounds.
In a specific embodiment, the insulator 5101 may be integrally formed with the movable contact fixing member 5102 and the insert 5103. Further, the movable contact fixing member 5102 may be a steel screw.
In an embodiment, the movable contact 210 in the vacuum interrupter chamber provided in the embodiment of the present invention is made of an elastic metal material, such as a memory alloy, and the flexibility of the elastic metal material itself can play a role in buffering when the movable contact 210 is in rapid contact with the stationary contact, so as to prolong the service life of the vacuum switch.
According to the vacuum switch provided by the embodiment of the invention, when the switching-on operation is executed, the switching-on coil generates a magnetic field under the driving of the switching power supply, the vortex disc cuts magnetic lines, the direction of the magnetic field generated by the switching-on coil is opposite to that generated by the vortex disc, repulsion force is generated between the switching-on coil and the vortex disc, the vortex disc is driven to move towards the direction far away from the switching-on coil, and the central shaft rod is driven to move upwards;
the magnetic conductive suction plate overcomes the attraction of the opening magnet and the gravity of the buffer mechanism to move upwards under the drive of the middle shaft lever and is sucked to the closing magnet;
the buffer mechanism is driven by the middle shaft lever to move upwards to drive the moving contact above the insulating buffer to move upwards and contact with the static contact in the vacuum arc extinguishing chamber, and the elastic component in the insulating buffer is stressed and compressed.
In the prior art, when a moving contact and a fixed contact in a vacuum arc extinguish chamber are in contact, due to the fact that the moving contact is high in action speed, a generated reverse acting force is large, and under the action of forces in two opposite directions, the moving contact and the fixed contact can bounce in a closing process, so that insulation in the vacuum arc extinguish chamber is damaged. In the embodiment of the invention, when the repulsive force between the vortex disc and the closing coil is larger than the attractive force of the opening magnet of the retaining mechanism to the magnetic conductive suction plate, the middle shaft rod moves upwards to ensure that the elastic part in the insulating buffer is stressed and compressed, the movement stroke of the moving contact is smaller than that of the middle shaft rod, the impact on the moving contact caused by the rapid movement of the middle shaft rod is buffered, and the connection safety of the moving contact and the fixed contact is improved; the elastic force of the elastic component in a compressed state can offset the reverse acting force of the moving contact and the static contact in the vacuum arc extinguishing chamber in the closing process, so that the moving contact is prevented from being separated from the static contact, and the time and the frequency of bouncing of the moving contact and the static contact in the closing process are reduced.
According to the vacuum switch provided by the embodiment of the invention, when the opening operation is executed, the opening coil generates a magnetic field under the driving of the switching power supply, the vortex disc cuts magnetic lines, the direction of the magnetic field generated by the opening coil is opposite to that generated by the vortex disc, repulsion force is generated between the opening coil and the vortex disc, the vortex disc is driven to move towards the direction far away from the opening coil, and the central shaft rod is driven to move downwards;
the magnetic conductive suction plate overcomes the downward movement of the suction force of the closing magnet under the drive of the middle shaft lever and is sucked to the opening magnet;
the buffer mechanism is driven by the middle shaft lever to move downwards to drive the moving contact above the insulating buffer to move downwards to be disconnected with the static contact in the vacuum arc extinguishing chamber, and the elastic component in the insulating buffer is restored to the original state.
In the prior art, when a moving contact and a fixed contact in a vacuum arc extinguishing chamber are disconnected, the moving contact has high action speed and large rebound force of opening due to the fact that the adopted operating mechanism is the spring operating mechanism, and re-ignition is easy to generate, so that the vacuum switch is difficult to break. In the embodiment of the invention, an eddy current driving mode is adopted, when the repulsive force between the eddy current disc and the opening coil is larger than the attractive force of the closing magnet of the retaining mechanism to the magnetic conductive suction plate, the middle shaft rod moves downwards, so that the elastic part in the insulating buffer is stressed to restore the original state, and meanwhile, the insulating buffer is driven to move downwards, so that the movable contact and the static contact are disconnected. In the driving process, the acting force between the opening coil and the vortex disc is large, the action speed is high, the disconnection speed of the moving contact and the static contact is high, the elastic pressure of the elastic component is released, the stroke of the buffer mechanism is smaller than the movement stroke of the middle shaft rod, the impact of the quick movement of the middle shaft rod on the moving contact can be buffered, the opening safety is improved, and the fusion welding phenomenon in a vacuum arc extinguish chamber is prevented from occurring, so that the vacuum arc extinguish chamber is prevented from being damaged.
In the vacuum switch provided by the embodiment of the invention, in order to prevent the vortex disc from colliding with the switching-off coil or the switching-on coil due to movement and damaging the switching-on coil and the switching-off coil, the distance between the switching-on coil and the switching-off coil can be set to be smaller than the distance between the switching-on magnet and the switching-off magnet. And when the eddy current disc is driven to drive the middle shaft rod and the magnetic conductive suction plate to move, the magnetic conductive suction plate impacts the closing magnet or the opening magnet of the retaining mechanism, and the eddy current disc cannot directly collide with the opening coil or the closing coil.
In one specific embodiment, when the vacuum switch is in a closing state or an opening state, the gap distance between the vortex disc and the closing coil or the opening coil is 0.5mm-1 mm. The smaller the gap between the vortex disc and the opening coil or the closing coil is, the smaller the induction inductance generated by the vortex disc is, the higher the conversion efficiency is, and the larger the acting force between the vortex disc and the opening coil or the closing coil is; however, in order to prevent the eddy current disc from directly impacting the coil due to mechanical abrasion, the inventor tests for many times to obtain that the gap distance between the eddy current disc and the opening coil is set to be 0.5mm-1mm in the closing state, and is set to be 0.5mm-1mm in the opening state.
Referring to fig. 2, in an embodiment of the present invention, a switching power supply 6 of a vacuum switch includes: a fast charging switching power supply 610, a switching-off capacitor bank 620, a switching-on capacitor bank 630, a diode 640, a switching-off power electronic switch 650 and a switching-on power electronic switch 660;
the switching-off capacitor bank 620 and the switching-on capacitor bank 630 are connected with the negative electrode of the fast charging switching power supply 610; the positive electrodes of the opening capacitor bank 620 and the closing capacitor bank 630 are respectively connected with the positive electrode of the fast charging switch power supply 610 through a diode 640, and the positive electrodes of the opening capacitor bank 620 and the closing capacitor bank 630 are respectively connected with the positive electrodes of the opening power electronic switch 650 and the closing power electronic switch 660;
cathodes of the opening power electronic switch 650 and the closing power electronic switch 660 are respectively connected with inlet ports of the opening coil 310 and the closing coil 320 of the vacuum switch, and cathodes of the opening capacitor bank 620 and the closing capacitor bank 630 are respectively connected with outlet ports of the opening coil 310 and the closing coil 320 of the vacuum switch;
the pulse output of the fast charging switch power supply 610 is respectively connected with the control electrodes of the opening power electronic switch 650 and the closing power electronic switch 660; the fast charging switch power supply 610 receives an external driving signal, controls the opening power electronic switch 650 and the closing power electronic switch 660 to be triggered and conducted, and energizes the opening coil 310 and the closing coil 320.
In one embodiment, referring to fig. 7, the fast charge switching power supply 610 includes: an EMC rectifying and filtering circuit 6101, a power control PWM circuit 6102 and an inverter boosting and rectifying circuit 6103 which are respectively connected with the EMC rectifying and filtering circuit 6101, the inverter boosting and rectifying circuit 6103 is connected to a shunt circuit 6106 through an output protection circuit 6104 and an energy recovery circuit 6105 which are connected in parallel, and the shunt circuit 6106 is respectively connected with the opening energy storage circuit 6107 and the closing energy storage circuit 6108.
In one embodiment, referring to fig. 7, the fast charge switching power supply 610 further includes: the switching-on/switching-off monitoring circuit comprises a voltage trickle supplementary circuit 6109 connected with a power supply control PWM circuit 6102, and a switching-off monitoring circuit 6110 and a switching-on monitoring circuit 6111 which are respectively connected with the voltage trickle supplementary circuit 6109, wherein the switching-off monitoring circuit 6110 is connected with the switching-off energy storage circuit 6107, and the switching-on monitoring circuit 6111 is connected with the switching-on energy storage circuit 6108.
In one embodiment, referring to fig. 7, the fast charging switching power supply 610 further includes: an intermittent adjusting circuit 6112 and a silicon controlled rectifier control circuit 6113 which are connected with the power supply control PWM circuit 6102, a trigger blocking circuit 6114 is connected between the intermittent adjusting circuit 6112 and the silicon controlled rectifier control circuit 6113, and the silicon controlled rectifier control circuit 6113 is respectively connected with a brake-separating energy storage circuit 6107 and a brake-closing energy storage circuit 6108.
In one embodiment, the opening capacitor bank 620, and/or the closing capacitor bank 630 includes at least one energy storage capacitor.
In one embodiment, the opening power electronic switch 650 and the closing power electronic switch 660 are thyristors. When the opening capacitor bank 620 or the closing capacitor bank 630 discharges, the opening power electronic switch 650 or the closing power electronic switch 660 is automatically turned off;
in one embodiment, the charging time of the fast charging switching power supply 601 to the opening capacitor bank 620 and the closing capacitor bank 630 is less than 0.5S.
In one embodiment, the capacity of the opening capacitor bank 620 is greater than the capacity of the closing capacitor bank 630.
The switching power supply provided by the embodiment of the invention has the advantages of high voltage control precision, stable voltage output, small ripple factor and no voltage overcharge phenomenon. The stability of the vacuum switch driving is ensured, and the opening and closing operation of the vacuum switch is smoothly realized.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 8, the embodiment of the present invention provides an actual charging circuit of a switching power supply: the EMC rectifying and filtering circuit of the charging circuit comprises: the circuit comprises an RC circuit consisting of a resistor and a capacitor, a current source S, a potentiometer U, a potentiometer connected in parallel, a relay contact and a rectifying circuit consisting of 4 diodes connected through a choke coil, and the output of the rectifier circuit to a PWM circuit. One bridge arm of the inverter boost rectifying circuit of the charging circuit is composed of switching tubes Q1 and Q2, the other bridge arm is composed of capacitors C1 and C2 (C1 is C2), the capacitors are metal film capacitors, the capacitance value is small, and the occurrence of a magnetic bias phenomenon is effectively prevented. The primary end of the high-frequency transformer is connected with the midpoints of C1 and C2, the other end of the high-frequency transformer is connected with the common connection end of Q1 and Q2, the voltage of the midpoints of Q1 and Q2 is equal to half of the rectified direct-current voltage, and alternating-current square-wave voltage with the amplitude Vi/2 is formed on the secondary side of the transformer when the switching tubes Q1 and Q2 are alternately conducted. When the switch tube Q1 is switched on and the switch tube Q2 is switched off, the voltage applied to two ends of the transformer T1 is half of the bus voltage Vi, and meanwhile, energy is transferred from the primary side to the secondary side of the transformer; when the switching tube Q1 is turned off and the switching tube Q2 is turned off, the two secondary windings of the transformer are in a short-circuit state due to the fact that the rectifier diodes follow current at the same time, the primary winding is also in a short-circuit state, the voltage applied to the two ends of the transformer is also basically half of the bus voltage, meanwhile, energy is transmitted from the primary side to the secondary side, and the two diodes on the secondary side complete current conversion.
The power supply of the switching power supply in the embodiment of the invention adopts a constant-frequency and constant-width control PWM mode, the control feedback is closed-loop through a voltage sampling loop, and trickle design and locking are participated in the closed-loop process.
Referring to fig. 9 to 14, in the embodiment of the present invention, the output protection circuit and the energy recovery circuit shown in fig. 9 are respectively connected to an opening/closing energy storage circuit; the power supply control PWM circuit shown in fig. 10 is connected to the switching transistors Q1 and Q2 of the charging circuit, and the intermittent adjustment circuit and the voltage trickle supplement circuit shown in fig. 11 and 12 are connected in parallel to the output terminal of the power supply control PWM shown in fig. 10 for simultaneously controlling the output of the power supply PWM; the breaking/closing voltage monitoring circuit shown in fig. 13 is directly connected to the breaking/closing energy storage circuit, and is configured to monitor voltage and send a high-low level signal to an external control module; the thyristor trigger circuits shown in fig. 14 are connected to the on/off power electronic switches, respectively.
Referring to fig. 15, the trigger lockout circuit provided in the embodiment of the present invention can implement automatic discharge shutdown: the signal of the opening and closing action is used as edge trigger, a time-adjustable rectangular pulse (the pulse width is more than or equal to 10ms) is output through a control circuit chip, a comparison locking circuit in the control board locks a power supply, and the output is turned off. Specifically, for example, the control circuit chip may include a timer SA555 and a multivibrator CD 14538.
Referring to fig. 2, the fast charging switching power supply 610 and the signal conversion module 470 are connected to a control module outside the vacuum switch, and the control module determines that the vacuum switch is at an opening or closing position according to a received level signal of the signal conversion module 470, and sends a closing or opening signal to the fast charging switching power supply to complete the opening or closing of the vacuum switch.
Referring to fig. 2, a Rogowski Coil (Rogowski Coil)12 is further disposed on the vacuum interrupter 2, and the Rogowski Coil 12 is connected to the control module for measuring and outputting the current of the vacuum switch to the control module.
Based on the same inventive concept, the embodiment of the invention also provides an electrical system applying the vacuum switch and an application of the vacuum switch in a power distribution network, and as the principle of solving the problems of the electrical system of the vacuum switch and the application of the vacuum switch in the power distribution network is similar to that of the vacuum switch, the implementation of the electrical system of the vacuum switch and the application of the vacuum switch in the power distribution network can refer to the implementation of the vacuum switch, and repeated parts are not repeated.
The embodiment of the invention provides an electrical system applying the vacuum switch.
The embodiment of the invention provides application of the vacuum switch in a power distribution network.
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 variations, 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.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (17)

1. A vacuum switch, comprising: a holding mechanism and a base;
the holding mechanism is fixed on the base;
the maintaining mechanism comprises a closing magnet, an opening magnet and a magnetic conductive suction plate, the magnetic conductive suction plate is fixedly connected with a central shaft rod of the vacuum switch, and is attracted with the closing magnet or the opening magnet under the driving of the central shaft rod; the magnetic flux of the closing magnet is greater than that of the opening magnet;
the base comprises a supporting rod and an upper base plate, and the switching-on magnet and the switching-off magnet are fixed on the upper base plate of the vacuum switch base through the supporting rod;
a second support sleeve is limited between the closing magnet and the opening magnet so as to limit the distance between the closing magnet and the opening magnet; the second support sleeve penetrates through the support rod;
one side of the magnetic conduction suction plate is provided with an extending part which protrudes outwards, and the extending part of the magnetic conduction suction plate can extend into a position between two adjacent supporting rods;
the switching-on magnet and the switching-off magnet comprise permanent magnets, magnetic yokes and stainless steel frameworks, wherein the permanent magnets are multiple and are annularly arranged in the accommodating grooves of the magnetic yokes at equal intervals; the permanent magnet is accommodated in the magnetic yoke, and the stainless steel framework is fixed on the inner surface of the magnetic yoke; the middle part of the outer surface of the permanent magnet is sunken inwards, the stainless steel framework is externally provided with a spacer strip corresponding to the middle part of the permanent magnet, and the permanent magnet is fixed in the magnet yoke.
2. The vacuum switch of claim 1, wherein the spacing between the closing and opening magnets is equal to the stroke of the magnetically conductive attraction plate.
3. The vacuum switch according to claim 1, further comprising an electro-optical switch fixed to the closing magnet and/or the yoke of the opening magnet.
4. The vacuum switch according to claim 3, wherein the closing magnet and/or the opening magnet are provided with a screw hole at a side of a yoke for fixing the photoelectric switch, and the photoelectric switch is fixed at a side of the yoke.
5. The vacuum switch according to claim 4, further comprising a signal conversion module in signal connection with the optoelectronic switch for converting the optoelectronic signal received by the optoelectronic switch into a level signal suitable for an external control module.
6. The vacuum switch according to any one of claims 1 to 5, further comprising: the vacuum arc extinguish chamber, the driving mechanism, the buffer mechanism and the switching power supply are arranged in the vacuum arc extinguish chamber;
a static contact and a moving contact are arranged in the vacuum arc extinguish chamber;
the holding mechanism is arranged below or above the driving mechanism;
the buffer mechanism is arranged above the driving mechanism and the holding mechanism;
the vacuum arc extinguish chamber, the driving mechanism, the buffer mechanism and the switching power supply are fixed on the base.
7. The vacuum switch of claim 6, wherein the drive mechanism comprises: the vortex disc is fixedly connected with the middle shaft rod.
8. The vacuum switch according to claim 7, wherein the switching-off coil or the switching-on coil generates a magnetic field under the driving of the switching power supply, and a repulsive force is generated between the switching-off coil or the switching-on coil and the vortex disc to drive the vortex disc to move in a direction away from the switching-off coil or the switching-on coil, so as to drive the central shaft rod to move up and down.
9. The vacuum switch of claim 7, wherein the opening coil, the vortex plate and the closing coil are circular and have the same center on the same straight line.
10. The vacuum switch according to claim 7, wherein the opening coil and the closing coil are fixed to an upper base plate of the vacuum switch base by a support bar.
11. The vacuum switch of claim 7, wherein a spacing between the closing coil and the opening coil is greater than a stroke of the whirl plate.
12. The vacuum switch of claim 6, wherein the damping mechanism comprises: the top of a middle shaft rod of the driving mechanism is in elastic contact with the elastic component in the cavity of the insulating buffer; and driving the insulation buffer to move up and down.
13. The vacuum switch of claim 12, wherein the insulating bumper comprises: insulator, moving contact mounting at insulator top, the inserts of insulator bottom, the cock of being connected with inserts fixed connection.
14. The vacuum switch of claim 13, wherein the central shaft comprises a rod body and a boss at the top of the rod body, the bottom surface of the cock is provided with a through hole, the rod body of the central shaft passes through the through hole, and the boss of the central shaft is accommodated in the cock.
15. The vacuum switch of claim 6, wherein the switching power supply comprises: the rapid charging switch power supply, the opening capacitor bank, the closing capacitor bank, the diode, the opening power electronic switch and the closing power electronic switch;
the switching-on and switching-off capacitor bank is connected with the negative electrode of the rapid charging switching power supply; the positive electrodes of the opening and closing capacitor banks are respectively connected with the positive electrode of the rapid charging switching power supply through diodes, and the positive electrodes of the opening and closing capacitor banks are respectively connected with the positive electrodes of the opening and closing power electronic switches;
cathodes of the opening and closing power electronic switches are respectively connected with inlet ports of opening and closing coils of the vacuum switch, and cathodes of the opening and closing capacitor banks are respectively connected with outlet ports of the opening and closing coils of the vacuum switch;
the pulse output of the rapid charging switch power supply is respectively connected with the control electrodes of the switch-on and switch-off power electronic switches; the rapid charging switch power supply receives an external driving signal and controls the switch-on and switch-off of the switch-on and switch-off power electronic switch.
16. An electrical system employing a vacuum switch as claimed in any one of claims 1 to 15.
17. Use of a vacuum switch according to any of claims 1-15 in an electrical distribution network.
CN201910105419.6A 2018-08-09 2019-02-01 Vacuum switch and related mechanism, system and application Active CN110349799B (en)

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