CN107017137B - Moving contact system of frame circuit breaker - Google Patents
Moving contact system of frame circuit breaker Download PDFInfo
- Publication number
- CN107017137B CN107017137B CN201710363544.8A CN201710363544A CN107017137B CN 107017137 B CN107017137 B CN 107017137B CN 201710363544 A CN201710363544 A CN 201710363544A CN 107017137 B CN107017137 B CN 107017137B
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- Prior art keywords
- movable
- contact
- arc
- piece
- base plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Abstract
The invention relates to a moving contact system of a frame circuit breaker, which comprises an upper base plate, a lower base plate, a fixed contact, a moving contact and an operating mechanism, wherein the upper base plate and the lower base plate are fixed on a circuit breaker body and used for supporting and limiting the moving contact and the fixed contact; the moving contact comprises a moving conductive bar, a fitting piece, a rotating shaft, a moving contact body, a moving arc striking plate, a connecting piece, a split contact and a plastic shell frame; the movable arc striking piece is fixed on the upper base plate, one end of the connecting piece is fixed on the movable conducting bar, and the other end of the connecting piece is connected with the right end of the movable arc striking piece. Compared with the prior art, the invention has the advantages that the movable arc striking piece is directly connected with the movable contact, so that the speed of transferring the electric arc from the split contact of the movable contact to the movable arc striking piece is greatly improved, the burning time of the electric arc on the split contact is reduced, the process of the electric arc entering the arc extinguish chamber is accelerated, and the breaking performance of the circuit breaker can be improved.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a moving contact system of a frame circuit breaker.
Background
With the rapid development of national economy, the capacity of a power grid can be increased all the time, so that the improvement of the breaking capacity of a breaker is a constant target. When the existing circuit breaker is used for breaking short-circuit current, the breaking capacity of the circuit breaker is limited due to the fact that contacts of a moving contact are seriously ablated and electric arcs cannot timely and fully enter an arc extinguish chamber grid. It is known that when a short-circuit current is cut off, when a moving contact and a fixed contact of a circuit breaker are separated, an electric arc is generated between the moving contact and the fixed contact, and the longer the electric arc stays on the moving contact and the fixed contact, the more serious the contact erosion is. Therefore, it is the objective of the industry to make the arc leave the moving and static contacts as soon as possible and enter the arc extinguishing grid plate. In the low-voltage circuit breaker, the force pushing the arc to move is two types, one is electromagnetic force, and the other is airflow thrust, wherein the electromagnetic force is Lorentz force generated when current flows, and the force can make the arc move to the arc extinguishing grid sheet; the gas flow thrust is that after the electric arc is generated, the gas near the contact expands rapidly, and simultaneously, under the action of high temperature, the gas generating material near the contact releases a large amount of gas instantly, and the gas flow is sprayed out of the gas outlet of the arc extinguishing chamber rapidly, so that the electric arc is pushed to move towards the arc extinguishing grid piece. The invention can greatly improve the pushing effect of electromagnetic force and aerodynamic force on the electric arc, so that the electric arc enters the dynamic arc striking plate as soon as possible and enters the arc extinguishing grid plate fully.
As known in the art, in the conventional circuit breaker, a static arc tab is connected to a static contact, and an electric arc can rapidly enter the static arc tab from the static contact under the action of electromagnetic force and airflow thrust, so that ablation on the static contact is reduced; because the moving contact is a moving part, a good scheme for arranging a movable striking sheet connected or contacted with the moving contact is not available, in the known contact structure, the movable striking sheet is arranged in an arc extinguish chamber, a certain gap is formed between the movable striking sheet and the moving contact split contact, the gap is about 5mm, the arc is transferred from the moving contact to the movable striking sheet, the air gap is broken down to complete the transfer, the process is usually long in time and can be repeated, so that the arc is ablated on the moving contact split contact for too long time, the burning of the moving contact is serious, and the breaking capacity and the breaking times of the circuit breaker are greatly influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a movable contact system of a frame circuit breaker, wherein a movable arc striking plate and a movable contact are directly connected, so that the speed of transferring an arc from a split contact of a movable contact to the movable arc striking plate is greatly increased.
The purpose of the invention can be realized by the following technical scheme:
a movable contact system of a frame circuit breaker comprises an upper base plate, a lower base plate, a fixed contact, a movable contact and an operating mechanism, wherein the upper base plate and the lower base plate are fixed on a circuit breaker body and used for supporting and limiting the movable contact and the fixed contact; the moving contact comprises a moving conductive bar, a fitting piece, a rotating shaft, a moving contact body, a moving arc striking plate, a connecting piece, a split contact and a plastic shell frame; the movable arc striking piece is fixed on the upper base plate, one end of the connecting piece is fixed on the movable conducting bar, and the other end of the connecting piece is connected with the right end of the movable arc striking piece.
The two sides of the right part of the movable arc striking piece are respectively provided with a second protrusion perpendicular to the surface of the movable arc striking piece, the two symmetrical connecting pieces are arranged in each cavity of the circuit breaker, the two connecting pieces are respectively attached to two side faces of the upper base plate in the cavity, and the connecting pieces are connected with the second protrusions of the movable arc striking pieces through second bolts.
The side of the upper base plate is provided with a first groove and a second groove, the shape of the first groove is matched with the side of the left part of the movable arc-striking piece, the side of the left part of the movable arc-striking piece is provided with a first protrusion which is inserted into the first groove to fix the movable arc-striking piece, meanwhile, the left part of the movable arc-striking piece is also fixed on the upper base plate through a first bolt, the shape of the second groove is matched with the side of the left end of the connecting piece, and the left end of the connecting piece is fixed in the second groove through a second bolt.
The movable contact comprises an upper base plate, a movable contact body, a movable contact bar, a movable contact body and a plastic shell frame, wherein the upper base plate is fixed on the upper base plate, the movable contact bar is fixed on the upper base plate, the split contact and the plastic shell frame are fixed on the movable contact body, the movable contact body is connected with the movable contact bar through a rotating shaft, and the movable contact.
The static contact comprises a static conductive bar and a static arc piece, and the static conductive bar and the static arc piece are fixed on the lower bottom plate.
The right side of the connecting piece is connected with the movable conducting bar through bolts.
The rightmost end of the movable arc striking piece is provided with a bending part at the upper left.
Compared with the prior art, the invention has the following advantages: the movable arc striking piece is directly connected with the movable conducting bar through the connecting piece, so that the electric potential of the movable arc striking piece is the same as that of the movable contact, when the contact is opened to generate electric arc, the electric arc can be quickly transferred to the movable arc striking piece due to the fact that the connecting piece can conduct current, the process that the electric arc is transferred to the movable arc striking piece after the air gap between the movable arc striking piece and the splitting contact is broken through is reduced, the burning time of the electric arc on the splitting contact is shortened, the process that the electric arc enters the arc extinguish chamber is accelerated, and the breaking performance of the circuit breaker is improved.
Drawings
Fig. 1 is a structural diagram of a moving contact system in an opening state according to the invention;
fig. 2 is a bottom view of the moving contact system of the present invention;
FIG. 3 is a schematic view of the connection between the moving ignition piece and the connecting member of the moving contact system of the present invention;
FIG. 4 is a schematic view of a moving contact system moving arc striking plate of the present invention;
fig. 5 is a schematic view of a moving contact system connection of the present invention;
fig. 6 is a schematic view of a groove on a bottom plate of the moving contact system of the present invention.
Reference numbers in the figures: the connecting structure comprises an upper base plate 1, a lower base plate 2, a static arc striking sheet 3, a static electricity conducting bar 4, a dynamic electricity conducting bar 5, a fitting piece 6, a rotating shaft 7, a moving contact body 8, a plastic shell frame 9, a split contact 10, a dynamic arc striking sheet 11, a connecting piece 12, a first bolt 13, a second bolt 14, a third bolt 15, a first groove 101, a second groove 102, a first protrusion 1101, a second protrusion 1102, a bending part 1103 and a connecting piece left end 1201.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A movable contact system of a frame circuit breaker comprises an upper base plate 1, a lower base plate 2, a fixed contact, a movable contact and an operating mechanism, wherein the upper base plate 1 and the lower base plate 2 are fixed on a circuit breaker body and used for supporting and limiting the movable contact and the fixed contact. The static contact comprises a static conductive bar 4 and a static arc piece 3, and the static conductive bar 4 and the static arc piece 3 are fixed on the lower base plate 2. The moving contact comprises a moving conductive bar 5, a fitting piece 6, a rotating shaft 7, a moving contact body 8, a moving arc piece 11, a connecting piece 12, a split contact 10 and a plastic shell 9, wherein the moving arc piece 11 is fixed on the upper base plate 1, the right end of the connecting piece 12 is fixed on the moving conductive bar 5 by a third bolt 15, and the left end of the connecting piece is connected with the right end of the moving arc piece 11. The rightmost end of the movable ignition piece 11 has a left upper bent portion 1103. The matching piece 6 is fixed on the upper base plate 1, the movable conducting bar 5 is fixed on the matching piece 6, the split contact 10 and the plastic shell frame 9 are fixed on the movable contact body 8, the movable contact body 8 is connected with the matching piece 12 through the rotating shaft 7, and the movable contact body 8 can rotate around the rotating shaft 7.
Wherein, the second protrusion 1102 perpendicular to the surface of the right part of the movable arc-striking piece 11 is arranged on both sides of the right part of the movable arc-striking piece, two symmetrical connecting pieces 12 are arranged in each cavity of the circuit breaker, the two connecting pieces 12 are respectively attached to the side surfaces of both sides of the upper base plate in the cavity, and the connecting pieces 12 are connected with the second protrusion 1102 of the movable arc-striking piece 11 through second bolts 14.
The side of the upper base plate 1 is provided with a first groove 101 and a second groove 102, wherein the shape of the first groove 101 is matched with the side of the left part of the movable arc-striking plate 11, and the shape of the second groove 101 is matched with the side of the left end of the connecting piece 12. The side surface of the left part of the movable arc-striking piece 11 is provided with a projection 1101 which is inserted into the first groove 101 so as to fix the movable arc-striking piece 11, and the left part of the movable arc-striking piece 11 is also fixed on the upper bottom plate 1 through the first bolt 13. The left end of the connecting member 12 is fixed in the second groove 102 by the second bolt 14.
The installation sequence is as follows: firstly, mounting and fixing a static contact on a lower base plate 2; then the movable arc striking plate 11 is inserted into the first groove 101 of the upper base plate 1 and is fixed through the first bolt 13; then, the fitting piece 6 and the movable conducting bar 5 are installed and fixed on the upper base plate 1; then, the connecting piece 12 is placed in a second groove 102 on the side surface of the upper base plate 1, the movable arc striking piece 11 and the connecting piece 12 are fixedly connected through a second bolt 14, and the right side of the connecting piece 12 is fixed on the movable conducting bar 5 through a third bolt 15; then the moving contact body 8 is sleeved on the rotating shaft 7 to rotate around the rotating shaft 7, the moving contact is arranged at a brake separating position, the lower bottom plate 2 is covered, the upper bottom plate 1 and the lower bottom plate 2 are fixedly installed together, and finally the moving contact body 8 is connected with a transmission part of an operating mechanism.
After the installation is finished, the moving contact body 8 rotates around the rotating shaft 7 under the driving of the operating mechanism, and the switching-on and switching-off are realized. The left side of the connecting piece 12 is connected with the movable arc striking piece 11, the right side of the connecting piece 12 is connected with the movable conducting bar 5, and the potential of the movable arc striking piece 11 is the same as that of the movable contact.
Claims (3)
1. A movable contact system of a frame circuit breaker, comprising:
an upper bottom plate and a lower bottom plate which are arranged on the breaker body,
a moving contact arranged between the upper base plate and the lower base plate,
the moving contact comprises:
a movable contact bar, a movable contact body and a movable arc striking sheet,
the arc striking device is characterized in that the movable arc striking plate is arranged on the upper bottom plate; the moving contact also comprises a connecting piece, and the connecting piece is connected with the moving conductive bar and the moving arc striking piece;
the side surface of the upper bottom plate is provided with a first groove and a second groove, the shape of the first groove is matched with the side surface of the left part of the movable arc-striking plate, the side surface of the left part of the movable arc-striking plate is provided with a first protrusion which is inserted into the first groove so as to fix the movable arc-striking plate, meanwhile, the left part of the movable arc-striking plate is also fixed on the top of the upper bottom plate through a first bolt, the shape of the second groove is matched with the side surface of the left end of the connecting piece, and the left end of the connecting piece is fixed in the second groove through a second bolt;
two second bulges which are vertical to the surfaces of the two second bulges are respectively arranged on the two sides of the right part of the movable arc striking piece, two symmetrical connecting pieces are arranged in each cavity of the circuit breaker, the two connecting pieces are respectively attached to the two side surfaces of the upper bottom plate in the cavity, and the connecting pieces are connected with the second bulges of the movable arc striking piece through second bolts;
the rightmost end of the movable arc striking piece is provided with a left upper bending part;
the movable arc striking piece is directly connected with the movable conducting bar through the connecting piece, so that the electric potential of the movable arc striking piece is the same as that of the movable contact, when the contact is opened to generate electric arc, the electric arc can be quickly transferred to the movable arc striking piece due to the fact that the connecting piece can conduct current, the process that the electric arc can be transferred to the movable arc striking piece only after the electric arc needs to break through an air gap between the movable arc striking piece and the splitting contact is reduced, the burning time of the electric arc on the splitting contact is shortened, the process that the electric arc enters the arc extinguish chamber is accelerated, and the breaking performance of the circuit breaker is improved.
2. The movable contact system of a frame circuit breaker as claimed in claim 1, wherein the movable contact further comprises a mating member, a rotating shaft, a movable contact body, a split contact and a plastic housing, the mating member is disposed on the upper base plate, the movable contact bar is connected to the mating member, the split contact and the plastic housing are mounted on the movable contact body, the movable contact body is connected to the mating member through the rotating shaft, and the movable contact body can rotate around the rotating shaft.
3. The movable contact system of a frame circuit breaker as claimed in claim 1, further comprising a stationary contact and an operating mechanism, wherein the stationary contact comprises a stationary conductive bar and a stationary tab, and the stationary conductive bar and the stationary tab are fixed to the lower base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710363544.8A CN107017137B (en) | 2017-05-22 | 2017-05-22 | Moving contact system of frame circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710363544.8A CN107017137B (en) | 2017-05-22 | 2017-05-22 | Moving contact system of frame circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107017137A CN107017137A (en) | 2017-08-04 |
| CN107017137B true CN107017137B (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710363544.8A Active CN107017137B (en) | 2017-05-22 | 2017-05-22 | Moving contact system of frame circuit breaker |
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| Country | Link |
|---|---|
| CN (1) | CN107017137B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117457453B (en) * | 2023-12-25 | 2024-04-30 | 浙江正泰电器股份有限公司 | Arc extinguishing structure of circuit breaker and circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492336A2 (en) * | 1990-12-27 | 1992-07-01 | ABBPATENT GmbH | Arc chamber for an electrical switch device |
| CN102064055A (en) * | 2011-01-21 | 2011-05-18 | 西安交通大学 | Contact system of circuit breaker |
| DE102011089234A1 (en) * | 2010-12-21 | 2012-06-21 | Siemens Aktiengesellschaft | Electric arc extinguishing device for use in e.g. circuit breaker, has double guide rail with projection, which is arranged such that arc is extended to projection of rail and divided in two partial arcs conducted into arc arcing chambers |
| CN206947283U (en) * | 2017-05-22 | 2018-01-30 | 国网上海市电力公司 | A kind of movable contact system of frame circuit breaker |
-
2017
- 2017-05-22 CN CN201710363544.8A patent/CN107017137B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492336A2 (en) * | 1990-12-27 | 1992-07-01 | ABBPATENT GmbH | Arc chamber for an electrical switch device |
| DE102011089234A1 (en) * | 2010-12-21 | 2012-06-21 | Siemens Aktiengesellschaft | Electric arc extinguishing device for use in e.g. circuit breaker, has double guide rail with projection, which is arranged such that arc is extended to projection of rail and divided in two partial arcs conducted into arc arcing chambers |
| CN102064055A (en) * | 2011-01-21 | 2011-05-18 | 西安交通大学 | Contact system of circuit breaker |
| CN206947283U (en) * | 2017-05-22 | 2018-01-30 | 国网上海市电力公司 | A kind of movable contact system of frame circuit breaker |
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| Publication number | Publication date |
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| CN107017137A (en) | 2017-08-04 |
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