CN214542013U - Novel contact, vacuum arc-extinguishing chamber and vacuum circuit breaker - Google Patents
Novel contact, vacuum arc-extinguishing chamber and vacuum circuit breaker Download PDFInfo
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- CN214542013U CN214542013U CN202120808730.XU CN202120808730U CN214542013U CN 214542013 U CN214542013 U CN 214542013U CN 202120808730 U CN202120808730 U CN 202120808730U CN 214542013 U CN214542013 U CN 214542013U
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Abstract
The utility model relates to a novel contact, vacuum interrupter and vacuum circuit breaker improves the structure of contact, and this novel contact moves end contact and quiet end contact including first moving end contact, second. The static end contact comprises a first contact area and a second contact area which are made of different materials, the second movable end contact comprises a contact part and a connecting part which are connected, the contact part slides relative to the first movable end contact through an opening, and the connecting part is connected with the inner wall of the first movable end contact through an elastic part. The contact part is located the top of second contact zone, and the first movable end contact that is located the contact part both sides is located the top of first contact zone, and then makes this novel contact be applicable to closing a floodgate process and separating brake process. The utility model provides a novel contact adopts the different contacts of different materials to bear combined floodgate high frequency surge flow and separating brake electric arc respectively, has realized anti melting welding performance and the part of breaking performance, has guaranteed the dielectric strength between the contact, has reduced the deformation of contact.
Description
Technical Field
The utility model relates to a power equipment technical field especially relates to a novel contact, vacuum interrupter and vacuum circuit breaker.
Background
At present, in the working process of a vacuum circuit breaker, a contact of the vacuum circuit breaker can deform under the erosion of electric arcs, and in the deformation process of the contact, a local heavy-strike discharge phenomenon can occur in a contact gap or a nearby area. And heavy breakdown can lead to overvoltage problems or high-frequency transient processes affecting the power quality of a power grid, possibly cause damage to circuit breakers or other electrical equipment, and threaten the safe operation of a power system.
Therefore, how to reduce the deformation of the contact is a problem which needs to be solved urgently at present.
Disclosure of Invention
The utility model aims at providing a novel contact, vacuum interrupter and vacuum circuit breaker improves the structure of contact, has guaranteed the dielectric strength between the contact, reduces the deformation of contact.
In order to achieve the above object, the utility model provides a following scheme:
a novel contact comprises a first movable end contact, a second movable end contact and a static end contact;
the static end contact comprises a first contact area and a second contact area which are made of different materials; the first contact areas are respectively arranged on two sides of the second contact area;
an opening is formed in one side, opposite to the static end contact, of the first movable end contact;
the second movable end contact is arranged in the hollow part of the first movable end contact and is in sliding connection with the first movable end contact; the second movable end contact comprises a contact part and a connecting part which are connected; the contact part slides relative to the first movable end contact through the opening; the connecting part is connected with the inner wall of the first movable end contact through an elastic component;
the contact part is positioned above the second contact area; the first movable end contacts positioned on two sides of the contact part are positioned above the first contact area.
A vacuum arc-extinguishing chamber comprises a shell, a movable conducting rod, a static conducting rod and the novel contact, wherein the movable conducting rod and the static conducting rod are positioned in the shell;
the movable conducting rod is provided with the first movable end contact, and the static conducting rod is provided with the static end contact;
the first movable end contact is positioned between the movable conducting rod and the static end contact.
A vacuum circuit breaker comprises a magnetic control mechanism and the vacuum arc extinguish chamber;
the magnetic control mechanism is connected with the movable conducting rod through an insulating pull rod and is used for driving the movable conducting rod to move.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model provides a novel contact, vacuum interrupter and vacuum circuit breaker improves the structure of contact, and this novel contact includes that first moving end contact, second move end contact and quiet end contact. The static end contact comprises a first contact area and a second contact area which are made of different materials, the second movable end contact comprises a contact part and a connecting part which are connected, the contact part slides relative to the first movable end contact through an opening, and the connecting part is connected with the inner wall of the first movable end contact through an elastic part. The contact part is located the top of second contact zone, and the first movable end contact that is located the contact part both sides is located the top of first contact zone, and then makes this novel contact be applicable to the combined floodgate process and the separating brake process of circuit breaker. In the switching-on process, the first movable end contact moves towards the direction close to the static end contact, before the elastic component is not compressed, the position of the second movable end contact is unchanged, at the moment, the distance between the first movable end contact and the static end contact is smaller than the distance between the second movable end contact and the static end contact, and therefore high-frequency inrush current during switching-on occurs between the first movable end contact and the static end contact. In the process of opening the brake, the first movable end contact moves towards the direction far away from the static end contact, the position of the second movable end contact is unchanged in the bouncing stage of the elastic component, and at the moment, the distance between the first movable end contact and the static end contact is larger than the distance between the second movable end contact and the static end contact, so that electric arc in the process of opening the brake is generated between the second movable end contact and the static end contact. Therefore, the utility model provides a novel contact adopts the different contacts of different materials to bear combined floodgate high frequency surge flow and separating brake electric arc respectively, has realized anti melting welding performance and the part of breaking performance, has guaranteed the dielectric strength between the contact, has reduced the deformation of contact.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a novel contact provided in embodiment 1 of the present invention.
Fig. 2 is a schematic position diagram of an arc chute provided in embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a vacuum interrupter provided in embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of a vacuum circuit breaker provided in embodiment 3 of the present invention.
Description of the symbols:
1-new contact; 2-a first moving end contact; 3-a second moving end contact; 4-a stationary end contact; 5-a first contact zone; 6-a second contact zone; 7-a contact portion; 8-a connecting part; 9-an elastic member; 10-arc extinguishing grid sheet; 11-a vacuum arc-extinguishing chamber; 12-a housing; 13-a movable conducting rod; 14-a static conductive rod; 15-ring-shaped permanent magnet; 16-a bellows; 17-a thermal insulation layer; 18-a shield; 19-a magnetic control mechanism; 20-insulating pull rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a novel contact, vacuum interrupter and vacuum circuit breaker improves the structure of contact, has guaranteed the dielectric strength between the contact, reduces the deformation of contact.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example 1:
referring to fig. 1, the present embodiment is to provide a novel contact 1, where the novel contact 1 includes a first moving-end contact 2, a second moving-end contact 3, and a stationary-end contact 4. The position of the static end contact 4 in the vacuum arc-extinguishing chamber is fixed and is always in a static state, and the first moving end contact 2 and the second moving end contact 3 can move relative to the static end contact 4 under the driving of the moving conductive rod and the elastic component 9.
The second moving-end contact 3 is arranged in the hollow interior of the first moving-end contact 2 and is connected with the first moving-end contact 2 in a sliding manner. In a general state, the second moving end contact 3 is located inside the first moving end contact 2, and when the vacuum arc-extinguishing chamber is opened and closed, the second moving end contact 3 slides out of the first moving end contact 2. The first movable end contact 2 can be in any shape, and only the surface opposite to the stationary end contact 4 needs to be a plane and can be attached to the first contact area 5.
The second moving-end contact 3 comprises a contact portion 7 and a connecting portion 8 which are connected. An opening is formed in the first movable end contact 2 on the side opposite to the fixed end contact 4, the contact part 7 slides relative to the first movable end contact 2 through the opening, and the connecting part 8 connected with the contact part 7 is driven to slide relative to the first movable end contact 2. The connecting portion 8 is connected to the inner wall of the first moving-end contact 2 via an elastic member 9, and the elastic member 9 is connected to the inner wall of the first moving-end contact 2 opposite to the opening.
The static end contact 4 comprises a first contact zone 5 and a second contact zone 6 which are made of different materials, and the two sides of the second contact zone 6 are respectively provided with the first contact zone 5. The contact portion 7 is located above the second contact zone 6, and the first moving-end contacts 2 located on both sides of the contact portion 7 are located above the first contact zone 5. When the contact portion 7 slides relative to the first moving-end contact 2, the contact portion 7 can contact the second contact zone 6, and the first moving-end contacts 2 on both sides of the contact portion 7 contact the first contact zone 5.
The novel contact 1 provided by the embodiment improves the structure of the contact, and comprises a first movable end contact 2, a second movable end contact 3 and a fixed end contact 4. In the switching-on process, the first moving end contact 2 moves towards the direction close to the static end contact 4, before the elastic component 9 is not compressed, the position of the second moving end contact 3 is unchanged, at the moment, the distance between the first moving end contact 2 and the static end contact 4 is smaller than the distance between the second moving end contact 3 and the static end contact 4, and therefore high-frequency inrush current during switching-on occurs between the first moving end contact 2 and the static end contact 4. In the process of opening the brake, the first movable end contact 2 moves towards the direction far away from the fixed end contact 4, the position of the second movable end contact 3 is unchanged in the bouncing stage of the elastic component 9, and at the moment, the distance between the first movable end contact 2 and the fixed end contact 4 is larger than the distance between the second movable end contact 3 and the fixed end contact 4, so that the electric arc in the process of opening the brake is generated between the second movable end contact 3 and the fixed end contact 4. Therefore, the utility model provides a novel contact 1 adopts the different contacts of different materials to bear combined floodgate high frequency surge flow and separating brake electric arc respectively, has realized anti melting welding performance and breaking performance's separately, has guaranteed the dielectric strength between the contact, has reduced the deformation of contact.
As an alternative embodiment, the first moving end contact 2 and the first contact area 5 are made of a welding-resistant material, which may be a tungsten-containing material. Furthermore, in the closing process, the first moving end contact 2 moves towards the direction close to the static end contact 4 under the driving of the moving conducting rod, before the elastic component 9 is uncompressed, the position of the second moving end contact 3 is unchanged, and at this time, the distance between the first moving end contact 2 and the static end contact 4 is smaller than the distance between the second moving end contact 3 and the static end contact 4, so that from the perspective of electric field distribution, high-frequency inrush current during closing will occur between the first moving end contact 2 and the static end contact 4. Because the first movable end contact 2 and the first contact zone 5 are both made of anti-fusion welding materials and have excellent anti-fusion welding performance, when high-frequency inrush current occurs between the first movable end contact 2 and the static end contact 4 during switching-on, the ablation damage effect of the high-frequency inrush current on the contact surface can be effectively reduced. The first moving contact 2 continues to move towards the direction close to the fixed contact 4, the elastic component 9 will be compressed, and at this time, the second moving contact 3 will also move towards the direction close to the fixed contact 4. When the closing is finished, the first moving end contact 2 and the second moving end contact 3 are simultaneously contacted with the static end contact 4, and the closing process is finished.
The second movable end contact 3 and the second contact area 6 are both made of cadmium-containing materials, or made of materials with high current breaking strength and high voltage resistance strength except the cadmium-containing materials. Furthermore, in the opening process, the first moving end contact 2 moves towards the direction far away from the fixed end contact 4, and in the bouncing stage of the elastic component 9, the position of the second moving end contact 3 is unchanged, and at the moment, the distance between the first moving end contact 2 and the fixed end contact 4 is larger than the distance between the second moving end contact 3 and the fixed end contact 4, so that from the view point of electric field distribution, an electric arc in the opening process can occur between the second moving end contact 3 and the fixed end contact 4. Because the second movable end contact 3 and the second contact zone 6 are both made of materials with high current breaking strength and high pressure resistance strength, when an electric arc in the opening process occurs between the second movable end contact 3 and the static end contact 4, the current breaking function can be completed, and the insulation strength between the second movable end contact 3 and the static end contact 4 is ensured.
Therefore, the utility model provides a novel contact 1 adopts the different contacts of different materials to bear combined floodgate high frequency surge flow and separating brake electric arc respectively, has realized anti melting welding performance and breaking performance's separately, has guaranteed the dielectric strength between the contact, has reduced the deformation of contact.
In addition, in this embodiment, the connection portion 8 may be always located in the hollow interior of the first moving-end contact 2, and at this time, the width of the connection portion 8 is set to be greater than the width of the opening on the first moving-end contact 2, so that, under the action of the elastic member 9, even if the contact portion 7 drives the connection portion 8 to slide relative to the first moving-end contact 2, the connection portion 8 does not slide out of the first moving-end contact 2. The elastic member 9 may be a spring.
In order to further reduce the influence of the arc on the contact in the opening process, referring to fig. 2, in this embodiment, a plurality of arc-extinguishing grid pieces 10 are further vertically arranged on a surface of the contact portion 7, which is in contact with the second contact region 6, and the plurality of arc-extinguishing grid pieces 10 are uniformly distributed along the circumferential direction of the contact portion 7 and extend along the radial direction of the contact portion 7 to form a radial structure. Each arc chute 10 may be perpendicular to the end surface of the contact portion 7 or may have an angle with the end surface of the contact portion 7 according to the moving track of the arc. In order to adapt to the arc-extinguishing grid 10 arranged on the contact portion 7, a groove is arranged on the second contact region 6 corresponding to the arc-extinguishing grid 10, so that the arc-extinguishing grid 10 can be inserted when the switch is switched on, and the contact portion 7 is completely attached to the second contact region 6.
In addition, an annular permanent magnet is arranged on the shell of the vacuum arc-extinguishing chamber at the position where the first moving-end contact 2 and the fixed-end contact 4 are in contact so as to form a transverse magnetic field, and the second moving-end contact 3 adopts a spiral groove-shaped contact.
And then in the process of opening the brake, the vacuum arc is formed at the moment when the contact part 7 is just separated from the second contact area 6, meanwhile, the arc can be acted by magnetic blow force generated by a transverse magnetic field in the motion process, and under the action of the magnetic blow force, the arc rotates along the surface of the contact part 7 continuously and highly on one hand, so that the surface of the contact part 7 is prevented from being seriously melted. On the other hand, the electric arc carries out spiral motion along the outer edge of the contact part 7, along with the spiral motion of the electric arc, the electric arc can enter the arc-extinguishing grid piece 10, under the effect of the arc-extinguishing grid piece 10, the electric arc is cut into a plurality of short arcs connected in series, further, the electric arc is elongated, a series of near-pole voltage drops can be formed on the surface of the arc-extinguishing grid piece 10, in addition, the electric arc can be influenced by the cooling effect of the arc-extinguishing grid piece 10, the electric arc voltage for maintaining the arcing at the moment can be rapidly increased, after the voltage at the two ends of the contact is not enough to maintain the arcing of the electric arc, the electric arc is extinguished and is not reignited, the insulation characteristic between the contacts can be recovered, the brake separation is completed, and the reliable breaking between the contacts is realized.
Example 2:
referring to fig. 3, the present embodiment is configured to provide a vacuum interrupter 11, where the vacuum interrupter 11 includes a housing 12, and a movable conducting rod 13 and a static conducting rod 14 located in the housing 12, and the novel contact 1 described in embodiment 1;
the movable conducting rod 13 is provided with a first movable end contact 2, the static conducting rod 14 is provided with a static end contact 4, and the first movable end contact 2 is positioned between the movable conducting rod 13 and the static end contact 4. The movable conducting rod 13 is used for driving the first movable end contact 2 to move.
The housing 12 may be made of ceramic to form a gas tight insulation system, isolating the vacuum state inside the vacuum interrupter 11 from the external atmospheric state. In addition, the vacuum interrupter 11 further includes a shield case 18. A shield 18 is located inside the housing 12, and the shield 18 encloses the moving conducting rod 13, the stationary conducting rod 14 and the new contact 1. Since the contact generates a large amount of metal vapor and droplets during the arcing process, the problem of the decrease in the dielectric strength of the housing 12 caused by the metal vapor and droplets being splashed onto the housing 12 can be prevented by providing the shield 18.
As an alternative embodiment, the vacuum interrupter 11 further comprises a bellows 16. One end of the corrugated pipe 16 is sleeved with the movable conducting rod 13, and the other end is fixed in the shell 12. A heat insulation layer 17 is arranged at the sleeve joint of the corrugated pipe 16 and the movable conducting rod 13, and a radiating fin is arranged on the part of the movable conducting rod 13, which is arranged outside the shell 12. The thermal insulation layer 17 may be a ceramic layer.
This embodiment no longer adopts traditional direct bellows one end to cup joint on moving the conducting rod and with the structure that moves the conducting rod linkage, because move the conducting rod in this structure and can directly contact with the bellows, heat transfer nature is high, and the bellows and move the one end that the conducting rod cup jointed and be closer to and move the end contact, be closer to the heat source promptly, consequently very lead to the temperature rise of bellows too high easily. In this embodiment, the thermal insulation layer 17 is additionally disposed between the corrugated tube 16 and the movable conducting rod 13, so that heat transfer between the movable conducting rod 13 and the corrugated tube 16 can be more directly reduced, and temperature rise of the corrugated tube 16 is effectively reduced. And the part of the movable conducting rod 13 arranged outside the shell 12 is provided with radiating fins, so that the temperature of the movable conducting rod 13 can be greatly reduced, the temperature of the corrugated pipe is further reduced, the surface area of the radiating fins, which is interacted with the temperature outside the shell 12, is larger, and the radiating effect is better.
Example 3:
referring to fig. 4, this embodiment is configured to provide a vacuum circuit breaker, where the vacuum circuit breaker includes a magnetron mechanism 19 and the vacuum interrupter 11 described in embodiment 2.
The magnetic control mechanism 19 is connected with the movable conducting rod 13 through an insulating pull rod 20 and is used for driving the movable conducting rod 13 to move so as to drive the first movable end contact 2 to move, and therefore opening and closing of the circuit breaker are achieved.
The moving iron core of the magnetic control mechanism 19 is driven to move by electrifying, exciting or demagnetizing the inner coil of the magnetic control mechanism 19, and the insulating pull rod 20 is driven to drive the moving conducting rod 13 to move, so that the moving end contact of the vacuum arc extinguish chamber 11 is communicated or disconnected with the static end contact 4, and the switching-on or switching-off operation of the circuit breaker is realized. In addition, when the circuit breaker is in a closing state, external force can be manually applied to act on the magnetic control mechanism 19, so that the movable iron core and the static iron core of the magnetic control mechanism 19 are separated, the movable end contact and the static end contact 4 are driven to be disconnected, and the manual opening and closing operation of the circuit breaker is realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. The novel contact is characterized by comprising a first movable end contact, a second movable end contact and a static end contact;
the static end contact comprises a first contact area and a second contact area which are made of different materials; the first contact areas are respectively arranged on two sides of the second contact area;
an opening is formed in one side, opposite to the static end contact, of the first movable end contact;
the second movable end contact is arranged in the hollow part of the first movable end contact and is in sliding connection with the first movable end contact; the second movable end contact comprises a contact part and a connecting part which are connected; the contact part slides relative to the first movable end contact through the opening; the connecting part is connected with the inner wall of the first movable end contact through an elastic component;
the contact part is positioned above the second contact area; the first movable end contacts positioned on two sides of the contact part are positioned above the first contact area.
2. The novel contact according to claim 1, wherein said first moving end contact and said first contact zone are both made of a fusion-resistant material.
3. The novel contact according to claim 1, wherein said second moving end contact and said second contact zone are both made of a cadmium-containing material.
4. The novel contact according to claim 1, wherein a plurality of arc extinguishing grids are erected on one surface of the contact part, which is in contact with the second contact area; the arc extinguishing grid pieces are uniformly distributed along the circumferential direction of the contact part and extend along the radial direction of the contact part;
and a groove is arranged at the position, corresponding to the arc extinguishing grid piece, of the second contact area.
5. The novel contact as claimed in claim 1, wherein the second moving end contact is a spiral slot type contact.
6. A vacuum arc-extinguishing chamber, characterized in that the vacuum arc-extinguishing chamber comprises a shell, a movable conducting rod and a static conducting rod which are positioned in the shell, and a novel contact according to any one of claims 1-5;
the movable conducting rod is provided with the first movable end contact, and the static conducting rod is provided with the static end contact;
the first movable end contact is positioned between the movable conducting rod and the static end contact.
7. The vacuum interrupter as claimed in claim 6, wherein the housing is provided with a ring-shaped permanent magnet at a position where the first moving end contact and the stationary end contact are in contact.
8. The vacuum interrupter as claimed in claim 6 further comprising a bellows;
one end of the corrugated pipe is sleeved with the movable conducting rod, and the other end of the corrugated pipe is fixed in the shell; a heat insulation layer is arranged at the sleeving joint of the corrugated pipe and the movable conducting rod; and the part of the movable conducting rod outside the shell is provided with a radiating fin.
9. The vacuum interrupter as claimed in claim 6 further comprising a shield;
the shielding cover is located inside the shell, and the shielding cover surrounds the movable conducting rod, the static conducting rod and the novel contact.
10. A vacuum circuit breaker, characterized in that it comprises a magnetron mechanism and a vacuum interrupter according to any of claims 6-9;
the magnetic control mechanism is connected with the movable conducting rod through an insulating pull rod and is used for driving the movable conducting rod to move.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120808730.XU CN214542013U (en) | 2021-04-20 | 2021-04-20 | Novel contact, vacuum arc-extinguishing chamber and vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120808730.XU CN214542013U (en) | 2021-04-20 | 2021-04-20 | Novel contact, vacuum arc-extinguishing chamber and vacuum circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214542013U true CN214542013U (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120808730.XU Active CN214542013U (en) | 2021-04-20 | 2021-04-20 | Novel contact, vacuum arc-extinguishing chamber and vacuum circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214542013U (en) |
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2021
- 2021-04-20 CN CN202120808730.XU patent/CN214542013U/en active Active
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