CN111161965B - Static contact and high-voltage switch - Google Patents
Static contact and high-voltage switch Download PDFInfo
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- CN111161965B CN111161965B CN201911422277.2A CN201911422277A CN111161965B CN 111161965 B CN111161965 B CN 111161965B CN 201911422277 A CN201911422277 A CN 201911422277A CN 111161965 B CN111161965 B CN 111161965B
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- 230000001629 suppression Effects 0.000 claims abstract description 53
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- 230000037431 insertion Effects 0.000 claims abstract description 13
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
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- 229910045601 alloy Inorganic materials 0.000 description 1
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention provides a static contact and a high-voltage switch, wherein the static contact comprises a static contact seat and a conductive contact finger arranged on the static contact seat, the conductive contact finger is provided with an insertion hole for a moving contact to be inserted and inserted, the static contact also comprises an arc striking ring which is shielded above the conductive contact finger, and the inner hole of the arc striking ring is coaxial with the insertion hole for the moving contact rod to pass through; the arc suppression device also comprises an arc suppression coil which is arranged around the outer side of the conductive contact finger, one end of the arc suppression coil is electrically connected with the arc striking ring, the other end of the arc suppression coil is electrically connected with the static contact base, and an arc suppression magnetic field is generated when current passes through the arc suppression coil; the shielding cover is fixed on the stationary contact seat and sleeved outside the arc suppression coil, the outer edge of the arc striking ring is arranged in a round angle mode, the upper end of the shielding cover extends to the lower side face of the arc striking ring, and the outer peripheral face of the shielding cover is flush with the outer side face of the shielding cover; the arc striking ring and the shielding cover jointly form an equipotential surface, so that an electric field in the static contact can be balanced.
Description
Technical Field
The invention belongs to the technical field of high-voltage electrical equipment devices, and particularly relates to a static contact and a high-voltage switch.
Background
With the continuous development of the power industry, sulfur hexafluoride gas insulated fully-enclosed power distribution devices (GIS for short) are widely applied in the power field as important electrical equipment, and high-voltage switches are used as important components of the GIS, so that the performance of the high-voltage switches has an important influence on the GIS.
Because high-voltage switch often bears great voltage and electric current, the fracture position often has the arc phenomenon of drawing in the divide-shut brake in-process, in order to avoid electric arc to cause great injury to the contact, high-voltage switch among the prior art is provided with arc extinction structure more in fracture position department. For example, the chinese patent application with publication number CN106960755A discloses a contact system and a single-pole arc-extinguishing chamber and a load switch using the same, wherein the contact system includes a stationary contact seat, a petal-shaped contact finger is provided on the stationary contact seat, an insulating support is provided at the periphery of the petal-shaped contact finger, an arc-extinguishing coil is provided on the insulating support, and an arc-extinguishing plate is fixed at one end of the insulating support. When moving contact and static contact draw the arc, the arc that produces can run on the arc extinguishing dish, then the arc can flow through arc suppression coil, through the electromagnetic induction principle, produces magnetic field in insulating support, under the effect of lorentz force, this magnetic field can drive the arc and make circumferential direction rotary motion along the arc extinguishing dish to the energy of dissipation arc, and extinguish arc in the short time of current zero crossing, thereby avoid the arc to burn on the stationary contact and ablate the contact, guarantee to cut off successfully. The arc extinguishing plate of the switch is provided with the flaring structure at one end facing the moving contact, the structural design easily causes uneven distribution of an electric field in the static contact, the electric field shielding effect is poor, and the switch is easily subjected to point discharge.
Disclosure of Invention
The invention aims to provide a static contact to solve the problem of uneven distribution of an electric field inside the static contact in the prior art, and also provides a high-voltage switch to solve the problem of uneven distribution of the electric field inside the static contact of the high-voltage switch in the prior art.
In order to achieve the above purpose, the technical scheme of the static contact of the invention is as follows:
a stationary contact, comprising:
a stationary contact base;
the conductive contact finger is arranged on the static contact seat and is provided with an insertion hole for inserting the moving contact to realize insertion;
the arc striking ring is shielded above the conductive contact finger, and an inner hole of the arc striking ring is coaxial with the inserting hole and used for the movable contact rod to pass through;
the arc suppression coil is arranged around the outer side of the conductive contact finger, one end of the arc suppression coil is electrically connected with the arc striking ring, the other end of the arc suppression coil is electrically connected with the static contact seat, when the moving contact and the static contact are subjected to arc discharge, current is led to the static contact seat through the arc suppression coil, and the arc suppression coil generates an arc suppression magnetic field inside the arc suppression coil;
the shielding cover is fixed on the stationary contact seat and sleeved outside the arc suppression coil;
the outward flange fillet setting of run-on ring, the upper end of shield cover stretches to the downside of run-on ring, and the outer peripheral face and the shield cover lateral surface parallel and level of run-on ring.
Has the advantages that: the outward flange fillet of run-on ring sets up, and the upper end of shield cover stretches to the downside of run-on ring, and the outer peripheral face of run-on ring sets up with the medial surface parallel and level of shield cover, and like this, run-on ring constitutes equipotential surface with the shield cover jointly to can balance the inside electric field of static contact.
Furthermore, a supporting structure is fixed on the static contact seat, the supporting structure is positioned between the arc suppression coil and the conductive contact finger and separates the arc suppression coil and the conductive contact finger, and the arc striking ring is fixed on the supporting structure.
Has the advantages that: the arc suppression coil and the conductive contact finger are separated, and meanwhile, the arc striking ring is convenient to fix.
Furthermore, the supporting structure is a metal support, a counter bore is formed in the arc striking ring and is connected with the upper end of the supporting structure through a connecting screw penetrating in the counter bore, and an insulating structure is arranged at the connecting position of the supporting structure and the arc striking ring.
Has the advantages that: the insulating structure is arranged between the supporting structure and the arc striking ring to realize the insulating isolation between the arc striking ring and the supporting structure, so that the short circuit of the arc extinguishing coil caused by the fact that the arc striking ring and the static contact base are in conductive connection through the supporting structure is avoided.
Further, the supporting structure is a supporting cylinder.
Has the advantages that: make things convenient for arc suppression coil's winding on the one hand, on the other hand bearing structure adopts a support section of thick bamboo, compares in the support column that the interval set up, and the wholeness can be better, and intensity is higher, makes bearing structure provide reliable support to the run-on ring in circumference.
Furthermore, the outer side surface of the lower part of the support cylinder is provided with a vertically extending long groove, the lower side groove wall of the long groove is provided with a screw through hole, and the support cylinder is connected with the static contact seat through a screw which is arranged in the screw through hole in a penetrating manner.
Has the advantages that: on the premise of arranging the fixing screws, the long grooves can be used for accommodating the screws, and the radial size of the static contact can be reduced as much as possible.
Furthermore, an annular insulating part is clamped between the upper end of the shielding cover and the arc striking ring.
Has the advantages that: the installation and the manufacture of the shielding cover are convenient, and the installation and the manufacture of the arc striking ring are also convenient.
Furthermore, the annular insulating part comprises a radial extension ring, an upper axial extension ring and a lower axial extension ring, and the upper axial extension ring and the lower axial extension ring are respectively matched with the corresponding side surfaces of the shielding case in a positioning way through the circumferential surfaces of the upper axial extension ring and the lower axial extension ring, so that the outer circumferential surface of the arc striking ring and the outer side surface of the shielding case are coaxially arranged.
Has the advantages that: the shielding case is fixed on the stationary contact seat, the supporting structure is also fixed on the stationary contact seat, and the annular insulating part can enable the run-on ring to be radially positioned with the shielding case, so that the radial positioning of the run-on ring and the supporting structure is indirectly realized, and the run-on ring and the supporting structure are conveniently fixed.
Further, the upper and lower axially extending rings are both inboard of the radially extending ring.
Has the advantages that: the installation and matching of the annular insulating part with the arc striking ring and the shielding case are conveniently realized.
Further, the cross-sectional shape of the annular insulating member is a flat T-shape.
Has the advantages that: the processing and the manufacturing of the annular insulating part are convenient.
In order to achieve the purpose, the technical scheme of the high-voltage switch is as follows:
the utility model provides a high-voltage switch, includes the moving contact, still includes the static contact with the moving contact adaptation, wherein, the static contact includes:
a stationary contact base;
the conductive contact finger is arranged on the static contact seat and is provided with an insertion hole for inserting the moving contact to realize insertion;
the arc striking ring is shielded above the conductive contact finger, and an inner hole of the arc striking ring is coaxial with the inserting hole and used for the movable contact rod to pass through;
the arc suppression coil is arranged around the outer side of the conductive contact finger, one end of the arc suppression coil is electrically connected with the arc striking ring, the other end of the arc suppression coil is electrically connected with the static contact seat, when the moving contact and the static contact are subjected to arc discharge, current is led to the static contact seat through the arc suppression coil, and the arc suppression coil generates an arc suppression magnetic field inside the arc suppression coil;
the shielding cover is fixed on the stationary contact seat and sleeved outside the arc suppression coil;
the outward flange fillet setting of run-on ring, the upper end of shield cover stretches to the downside of run-on ring, and the outer peripheral face and the shield cover lateral surface parallel and level of run-on ring.
Has the advantages that: the outward flange fillet of run-on ring sets up, and the upper end of shield cover stretches to the downside of run-on ring, and the outer peripheral face of run-on ring sets up with the medial surface parallel and level of shield cover, and like this, run-on ring constitutes equipotential surface with the shield cover jointly to can balance the inside electric field of static contact.
Furthermore, a supporting structure is fixed on the static contact seat, the supporting structure is positioned between the arc suppression coil and the conductive contact finger and separates the arc suppression coil and the conductive contact finger, and the arc striking ring is fixed on the supporting structure.
Has the advantages that: the arc suppression coil and the conductive contact finger are separated, and meanwhile, the arc striking ring is convenient to fix.
Furthermore, the supporting structure is a metal support, the arc striking ring is provided with a counter bore and is connected with the upper end of the supporting structure through a connecting screw penetrating in the counter bore, and the supporting structure and the arc striking ring are provided with an insulating structure at the connecting position.
Has the advantages that: the insulating structure is arranged between the supporting structure and the arc striking ring to realize the insulating isolation between the arc striking ring and the supporting structure, so that the short circuit of the arc extinguishing coil caused by the fact that the arc striking ring and the static contact base are in conductive connection through the supporting structure is avoided.
Further, the supporting structure is a supporting cylinder.
Has the advantages that: make things convenient for arc suppression coil's winding on the one hand, on the other hand bearing structure adopts a support section of thick bamboo, compares in the support column that the interval set up, and the wholeness can be better, and intensity is higher, makes bearing structure provide reliable support to the run-on ring in circumference.
Furthermore, the outer side surface of the lower part of the supporting cylinder is provided with a vertically extending long groove, the lower side groove wall of the long groove is provided with a screw through hole, and the supporting cylinder is connected with the static contact seat through a screw which is arranged in the screw through hole in a penetrating manner.
Has the advantages that: on the premise of arranging the fixing screws, the long grooves can be used for accommodating the screws, and the radial size of the static contact can be reduced as much as possible.
Furthermore, an annular insulating part is clamped between the upper end of the shielding cover and the arc striking ring.
Has the advantages that: the installation and the manufacture of the shielding cover are convenient, and the installation and the manufacture of the arc striking ring are also convenient.
Furthermore, the annular insulating part comprises a radial extension ring, an upper axial extension ring and a lower axial extension ring, and the upper axial extension ring and the lower axial extension ring are respectively matched with the corresponding side surfaces of the shielding case in a positioning way through the circumferential surfaces of the upper axial extension ring and the lower axial extension ring, so that the outer circumferential surface of the arc striking ring and the outer side surface of the shielding case are coaxially arranged.
Has the advantages that: the shielding case is fixed on the stationary contact seat, the supporting structure is also fixed on the stationary contact seat, and the annular insulating part can enable the run-on ring to be radially positioned with the shielding case, so that the radial positioning of the run-on ring and the supporting structure is indirectly realized, and the run-on ring and the supporting structure are conveniently fixed.
Further, the upper and lower axially extending rings are both inboard of the radially extending ring.
Has the advantages that: the installation and matching of the annular insulating part with the arc striking ring and the shielding case are conveniently realized.
Further, the cross-sectional shape of the annular insulating member is a flat T-shape.
Has the advantages that: the processing and manufacturing of the annular insulating part are facilitated.
Drawings
FIG. 1 is a schematic diagram of a high voltage switch according to the present invention;
fig. 2 is a schematic structural diagram of a stationary contact in the high voltage switch in fig. 1;
in the figure: 1-an arc striking ring; 2-a first insulating ring; 3-petal-shaped contact fingers; 4-stationary contact seat; 5, tightly holding the spring; 6-wear resistant pad; 7-a shielding case; 8-a set screw; 13-a connection screw; 15-an insulating sleeve; 16-a second insulating ring; 17-a support cylinder; 18-ring-shaped insulator; 19-arc suppression coil; 20-moving contact; 21-a static contact; 22-an insulator; 23-a housing; 24-isolating grounding switch.
Detailed Description
The embodiments of the high voltage switch according to the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the high-voltage switch of the present invention is described by taking a three-phase gas-insulated metal-enclosed switchgear as an example, but the high-voltage switch of the present invention is not limited to the switch described in the present embodiment, and may be a dc high-voltage switch in another embodiment.
The three-phase gas-insulated metal-enclosed combined switch device of the present embodiment is shown in fig. 1, and includes a housing 23 and an isolated ground switch 24 assembled in the housing 23, wherein the housing is filled with a mixed gas as a medium for insulation and arc extinction, the housing of the high-voltage switch is connected with an insulator 22, the high-voltage switch includes a moving contact 20 and a static contact 21 adapted to the moving contact 20, wherein the moving contact 20 includes a moving contact rod, and when the moving contact 20 and the static contact 21 are in an insertion state and the isolated ground switch is in an isolation position, the high-voltage switch is in an isolation state.
The static contact is mainly improved and has the specific structure shown in fig. 2, the static contact 21 comprises a static contact seat 4 and a support structure with the lower end fixed on the static contact seat 4, the support structure is a support barrel 17, the support barrel 17 is a metal support, and an arc striking ring 1 is fixed at the upper end of the support barrel 17 in an insulating manner. The inner side of the supporting cylinder 17 is provided with a conductive contact finger which is enclosed by a petal-shaped contact finger 3, the petal-shaped contact finger 3 is arranged on the fixed contact seat 4 and is arranged in a surrounding way on the same circumference, the middle part of the petal-shaped contact finger 3 is enclosed to form an insertion hole for inserting the movable contact rod, the insertion hole and the inner hole of the arc striking ring 1 are coaxially arranged, so that the movable contact rod on the movable contact 20 is inserted into the insertion hole to realize the insertion of the movable contact 20 and the fixed contact 21.
An arc suppression coil 19 is arranged on the outer side of the supporting cylinder 17 in an enclosing mode, the arc suppression coil 19 is composed of enameled wires and crimping terminals at two ends, one end of the arc suppression coil 19 is electrically connected with the arc striking ring 1, and the other end of the arc suppression coil 19 is electrically connected with the static contact seat 4 through the supporting cylinder 17, so that the arc striking ring 1, the arc suppression coil 19, the supporting cylinder 17 and the static contact seat 4 form a loop together. When high-voltage switching-off current flows, the movable contact 20 moves out of the fixed contact 21 and is separated from contact with the petal-shaped contact fingers, a part of an arc between the movable contact 20 and the fixed contact 21 can move to the arc suppression coil 19 through the arc striking ring 1, then the arc current can form a conductive loop among the arc striking ring 1, the arc suppression coil 19 and the fixed contact seat 4, a magnetic field is generated in the arc suppression coil 19 through the electromagnetic induction principle, and the magnetic field can drive the arc to rotate at high speed under the action of Lorentz force, so that the arc on the arc striking ring 1 is rapidly extinguished, the arc is prevented from burning on the fixed contact 21 to ablate a contact, and successful switching-off is ensured.
The static contact seat 4 is also fixed with a shielding cover 7, the shielding cover 7 is arranged at the outer side of the arc suppression coil 19, and the upper end of the shielding cover extends to the lower side surface of the arc striking ring 1. The outer edge of the arc striking ring 1 is rounded, and the outer peripheral surface of the arc striking ring 1 is flush with the outer side surface of the shielding case 7, so that the outer peripheral surface of the arc striking ring 1 and the outer side surface of the shielding case 7 form an equipotential surface, and the effect of balancing an electric field inside the static contact 21 can be achieved.
The arc striking ring 1 is fixed at the upper end of a supporting cylinder 17 and is realized the insulating isolation between arc striking ring 1 and the supporting cylinder 17 through insulation construction, and in this embodiment, insulation construction is insulating cover 15 and second insulator ring 16, and the equipartition is provided with eight counter bores on the arc striking ring 1, wears to be equipped with connecting screw 13 in the counter bore, still is provided with insulating cover 15 in the counter bore, is used for realizing the insulating isolation between arc striking ring 1 and connecting screw 13. The lower terminal surface of run-on ring 1 presss from both sides between the up end of a support section of thick bamboo 17 and is equipped with second insulator ring 16 for realize the insulating isolation between run-on ring 1 and the support section of thick bamboo 17, the connecting screw 13 of wearing to adorn in the counter bore passes second insulator ring 16 and realizes the fixed connection of run-on ring 1 and a support section of thick bamboo 17, in this embodiment, the run-on ring is the copper dock alloy, can be high temperature resistant and resistant electric arc ablation, the material of a support section of thick bamboo is the aluminum alloy, not only the quality is light still has higher structural strength, in other embodiments, the material of a support section of thick bamboo still can be the titanium alloy.
The lower part of the support cylinder 17 is fixedly connected with the static contact base 4 through eight fixing screws 8, the outer side surface of the lower part of the support cylinder 17 is provided with a vertically extending long groove, the lower side groove wall of the long groove is provided with a screw through hole, and the support cylinder 17 is connected with the static contact base 4 through the fixing screws 8 arranged in the screw through holes in a penetrating mode. In this way, the radial dimension of the stationary contact 21 can be reduced as much as possible on the premise of the fixing screw 8.
The periphery of the petal-shaped contact finger 3 is provided with the holding spring 5, so that the petal-shaped contact finger 3 can be ensured to have enough contact force when being inserted into the movable contact rod, and the bottom end of the petal-shaped contact finger 3 can be tightly hooped on the static contact seat 4. In order to avoid friction between the petal-shaped contact fingers 3 and the static contact seat 4, a wear-resistant pad 6 is clamped between the bottoms of the petal-shaped contact fingers 3 and the static contact seat 4, a first insulating ring 2 is arranged between the top ends of the petal-shaped contact fingers 3 and the arc striking ring 1, and the arc striking ring 1 and the top ends of the petal-shaped contact fingers 3 are insulated and isolated.
Four round holes are uniformly distributed on the outer peripheral surface of the lower part of the shielding cover 7, and the shielding cover 7 is fixed on the stationary contact seat 4 through a set screw. In order to avoid the electric connection between the shielding cover 7 and the arc striking ring 1 and form a short circuit on a loop formed by the arc striking ring 1, the arc extinguishing coil 19, the supporting cylinder 17 and the static contact seat 4, an annular insulating part 18 is arranged between the upper end of the shielding cover 7 and the arc striking ring 1, and the shielding cover 7 and the arc striking ring 1 are isolated and isolated through the annular insulating part 18. The cross-sectional shape of the annular insulating member 18 is a flat T-shape, and includes a radially extending ring and an axially extending ring located on the inner side of the radially extending ring surface, the axially extending ring includes an upper axially extending ring located above the radially extending ring and a lower axially extending ring located below the radially extending ring, the upper axially extending ring is in positioning fit with the inner side of the arc ignition ring 1 through the outer peripheral surface thereof, and the lower axially extending ring is in positioning fit with the inner side of the shield case 7 through the outer peripheral surface thereof, so as to ensure that the outer peripheral surface of the arc ignition ring 1 and the outer side of the shield case 7 are coaxially arranged, and the two form an equipotential surface.
In this embodiment, the first insulating ring, the second insulating ring, the wear pad, and the insulating sleeve are all made of teflon.
In this embodiment, be fixed with bearing structure on the stationary contact seat, bearing structure is in between arc suppression coil and the electrically conductive finger and separates both, and the run-on ring is fixed on bearing structure, and in other embodiments, can also not set up bearing structure on the stationary contact seat, and at this moment, arc suppression coil and electrically conductive finger interval set up of touching, and pass through insulating screw with the run-on ring and fix on the shield cover, at this moment, insulate between run-on ring and the static contact seat and keep apart.
In the embodiment, the supporting structure is a metal support, the arc striking ring is provided with a counter bore and is connected with the upper end of the supporting structure through a connecting screw penetrating in the counter bore, the supporting structure and the arc striking ring are provided with an insulating structure at a connecting position, in other embodiments, the supporting structure can be set as an insulating supporting structure, at the moment, the upper end of the insulating supporting structure is directly and fixedly connected with the arc striking ring, and the lower end of the insulating supporting structure is directly and fixedly connected with the static contact base, so that the short circuit of the arc extinguishing coil caused by the fact that the arc striking ring is electrically connected with the static contact base through the supporting structure can be avoided; or the arc striking ring is provided with a counter bore and is connected with the upper end of the supporting structure through a connecting screw penetrating in the counter bore, the lower end of the supporting structure is provided with the counter bore and is connected with the static contact seat through the connecting screw penetrating in the counter bore, an insulating ring is arranged at the contact position of the lower end of the supporting structure and the static contact seat, the supporting structure and the static contact seat are insulated and isolated, and an insulating sleeve is arranged in the counter bore at the lower end of the supporting structure, so that the short circuit of the arc extinguishing coil caused by the fact that the arc striking ring is electrically connected with the static contact seat through the supporting structure is avoided.
In this embodiment, the supporting structure is a supporting cylinder, and in other embodiments, the supporting structure may also be a plurality of supporting columns arranged at intervals in the circumferential direction. In this embodiment, an annular insulating member is interposed between the upper end of the shield case and the arc ignition ring, and in other embodiments, the annular insulating member may not be disposed between the upper end of the shield case and the arc ignition ring, but is directly and fixedly connected, so long as the outer side surface of the shield case is flush with the outer peripheral surface of the arc ignition ring, and the insulating member is disposed between the lower end of the shield case and the static contact base, and the insulating isolation between the arc ignition ring and the static contact base is realized through the insulating isolation between the shield case and the static contact base.
In this embodiment, the annular insulating member includes a radially extending ring, an upper axially extending ring, and a lower axially extending ring, and the upper and lower axially extending rings are respectively in positioning fit with the corresponding side surfaces of the shield case through circumferential surfaces thereof, so as to ensure that the outer circumferential surface of the arc striking ring is coaxially arranged with the outer side surface of the shield case.
In this embodiment, the upper and lower axially extending rings are both inside the radially extending ring, and in other embodiments, the upper and lower axially extending rings are both outside the radially extending ring, or the upper axially extending ring is inside the radially extending ring and the lower axially extending ring is outside the radially extending ring, or the upper axially extending ring is outside the radially extending ring and the lower axially extending ring is inside the radially extending ring.
In this embodiment, the cross section of the annular insulating member is a flat T-shape, and includes a radially extending annular surface and an axially extending surface located on an inner side surface of the radially extending annular surface; or the upper axial extension ring and the lower axial extension ring are staggered in the radial direction, at the moment, the thickness of the lower end of the arc striking ring is different from that of the upper end of the shielding cover, when the outer circumferential surface of the upper axial extension ring is matched with the inner circumferential surface of the arc striking ring in a positioning mode, the outer circumferential surface of the lower axial extension ring is matched with the inner side surface of the shielding cover in a positioning mode, and at the moment, the outer circumferential surface of the arc striking ring is arranged coaxially with the outer side surface of the shielding cover.
In this embodiment, the outer side surface of the lower portion of the support cylinder is provided with a vertically extending elongated slot, a lower side slot wall of the elongated slot is provided with a screw through hole, the support cylinder is connected with the static contact base through a screw which is arranged in the screw through hole in a penetrating manner, in other embodiments, the outer side surface of the lower portion of the support cylinder may not be provided with the vertically extending elongated slot, the lower end of the support cylinder is provided with a connecting flange, and a fixing screw penetrates through the through hole on the connecting flange and the through hole on the static contact base so as to fixedly connect the support cylinder with the static contact base.
In this embodiment, the conductive contact fingers are petal-shaped contact fingers, and in other embodiments, the conductive contact fingers may also be spring contact fingers; or the conductive contact finger can also be a cylindrical structure embedded with the conductive contact finger.
In this embodiment, the insulating structure is a second insulating sleeve and a second insulating ring, in other embodiments, the insulating structure is an insulating screw and a second insulating ring, and the top of the shielding case is fixedly connected with the upper part of the supporting cylinder by the insulating screw.
In this embodiment, eight counter bores are uniformly distributed on the arc starting ring, and in other embodiments, two, three, four or five counter bores are arranged on the arc starting ring.
In this embodiment, the lower part of the support cylinder is fixedly connected with the stationary contact base through eight fixing screws, and in other embodiments, the lower part of the support cylinder is fixedly connected with the stationary contact base through two, three, four or five fixing screws.
In this embodiment, four round holes are uniformly distributed on the outer peripheral surface of the lower part of the shielding cover, and in other embodiments, two, three or more than five round holes are uniformly distributed on the outer peripheral surface of the lower part of the shielding cover.
In the specific embodiment of the static contact of the invention, the specific structure of the static contact is the same as that of the high-voltage switch, and the detailed description is omitted.
Claims (8)
1. A static contact, comprising:
a stationary contact base;
the conductive contact finger is arranged on the static contact seat and is provided with an insertion hole for inserting the moving contact to realize insertion;
the arc striking ring is shielded above the conductive contact finger, and an inner hole of the arc striking ring is coaxial with the inserting hole and used for the movable contact rod to pass through;
the arc suppression coil is arranged around the outer side of the conductive contact finger, one end of the arc suppression coil is electrically connected with the arc striking ring, the other end of the arc suppression coil is electrically connected with the static contact seat, when the moving contact and the static contact are subjected to arc discharge, current is led to the static contact seat through the arc suppression coil, and the arc suppression coil generates an arc suppression magnetic field inside the arc suppression coil;
the shielding cover is fixed on the stationary contact seat and sleeved outside the arc suppression coil;
the outer edge of the arc striking ring is arranged in a round angle mode, the upper end of the shielding cover extends to the lower side face of the arc striking ring, and the outer peripheral face of the arc striking ring is flush with the outer side face of the shielding cover;
an annular insulating part is clamped between the upper end of the shielding cover and the arc striking ring;
the annular insulating part comprises a radial extension ring, an upper axial extension ring and a lower axial extension ring, and the upper axial extension ring and the lower axial extension ring are respectively matched with the corresponding side surfaces of the shielding case in a positioning way through the circumferential surfaces of the upper axial extension ring and the lower axial extension ring, so that the outer circumferential surface of the arc striking ring and the outer side surface of the shielding case are coaxially arranged.
2. The stationary contact as set forth in claim 1 wherein a support structure is secured to said stationary contact base, said support structure being disposed between and separating said arc suppression coil and said conductive contact finger, said arc runner being secured to said support structure.
3. The static contact as claimed in claim 2, wherein the supporting structure is a metal support, the arc-striking ring is provided with a counter bore and is connected to the upper end of the supporting structure by a connecting screw inserted into the counter bore, and the supporting structure and the arc-striking ring are provided with an insulating structure at the connecting position.
4. The static contact of claim 3, wherein the support structure is a support cylinder.
5. The static contact of claim 4, wherein the outer side of the lower portion of the supporting cylinder is provided with a vertically extending elongated slot, the lower side of the elongated slot is provided with a screw through hole, and the supporting cylinder is connected to the static contact base by a screw inserted into the screw through hole.
6. The static contact of claim 1, wherein the upper and lower axially extending rings are both inboard of the radially extending ring.
7. The static contact of claim 6, wherein the cross-sectional shape of the annular insulating member is a flattened T-shape.
8. A high-voltage switch, characterized by comprising a movable contact and a stationary contact according to any one of claims 1 to 7 adapted to the movable contact.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422277.2A CN111161965B (en) | 2019-12-31 | 2019-12-31 | Static contact and high-voltage switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422277.2A CN111161965B (en) | 2019-12-31 | 2019-12-31 | Static contact and high-voltage switch |
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| CN111161965A CN111161965A (en) | 2020-05-15 |
| CN111161965B true CN111161965B (en) | 2022-05-17 |
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| CN112103122B (en) * | 2020-08-24 | 2023-01-31 | 沈阳金昌蓝宇新材料股份有限公司 | Thin-wall dissimilar metal composite grounding contact and preparation method thereof |
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| CN111161965A (en) | 2020-05-15 |
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