CN212461578U - Contact system of low-voltage circuit breaker - Google Patents
Contact system of low-voltage circuit breaker Download PDFInfo
- Publication number
- CN212461578U CN212461578U CN202021914572.8U CN202021914572U CN212461578U CN 212461578 U CN212461578 U CN 212461578U CN 202021914572 U CN202021914572 U CN 202021914572U CN 212461578 U CN212461578 U CN 212461578U
- Authority
- CN
- China
- Prior art keywords
- contact
- movable contact
- blades
- moving
- circuit breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The utility model relates to a contact system of low-voltage circuit breaker, including moving contact system and static contact system, the moving contact system includes a plurality of movable contact blades (3), movable contact (4), contact support (5), first axis of rotation (7) and contact spring (8), movable contact (4) are located movable contact blade (3), a plurality of movable contact blades (3) are connected side by side on first axis of rotation (7) and can rotate around first axis of rotation (7), first axis of rotation (7) are installed on contact support (5), install contact spring (8) on contact support (5); the plurality of movable contact blades (3) comprise a middle sequence movable contact blade and two side movable contact blades, wherein the middle sequence movable contact blade is a movable contact blade with an arc striking angle (305). Compared with the prior art, the utility model discloses the striking is fast, and it is high to divide the ability of breaking, and structural stability is strong to can realize spring mounting positioning adjustment.
Description
Technical Field
The utility model relates to a low-voltage apparatus technical field, concretely relates to low-voltage circuit breaker's contact system.
Background
The contact system of the circuit breaker is responsible for the difficult tasks of normally connecting, disconnecting and connecting short-circuit current, so the designed contact system has the requirements of sufficient dynamic and thermal stability, welding resistance, wear resistance and temperature rise. Along with market demands, the application range of the conventional universal circuit breaker in the field of new energy is wider and wider, for example, the photovoltaic field and the wind power field, because the number of the parallel-connected movable contact systems which are originally designed in the industry is small, and the situation that the installation position of a contact spring deviates exists inevitably during the assembly of the movable contact systems, the situation that the contact spring deviates from the normal use position also exists during the frequent opening and closing of the contact system in use. In order to meet the requirements of reliable breaking, short-circuit current connection and temperature rise of the circuit breaker, how to maintain and ensure the contact pressure of the movable contact system and reduce the use temperature rise of the contact system is of great importance.
The utility model patent CN207587676U discloses a moving contact of circuit breaker, including the contact support, the apparatus further comprises a rotating shaft, move the contact piece, flexible coupling and moving contact mother row, the pivot is rotated and is set up on the contact support, the moving contact piece is connected to flexible coupling one end electricity, other end electricity is connected the moving contact mother row, this patent still includes a moving contact support, the moving contact support includes a plurality of support bars pieces that are separated by the setting, support bars and moving contact setting of staggering each other, be equipped with respectively in moving contact support both sides and be used for the first connecting portion and the second connecting portion fixed with each support bars. Owing to add contact carrier, contact carrier guarantees the clearance between each moving contact piece through the fixed support bars piece in both sides, has also guaranteed the intensity of support bars piece simultaneously, makes the circuit breaker can satisfy to the height short resistant, the high disconnected requirement of dividing, miniaturized development, nevertheless this utility model spring mounting time positioning adjustment difficulty, and moving contact striking speed is slower.
SUMMERY OF THE UTILITY MODEL
The object of the present invention is to provide a contact system for a low-voltage circuit breaker, which is faster in arc striking speed, in order to overcome the drawbacks of the prior art.
The purpose of the utility model can be realized through the following technical scheme: a contact system of a low-voltage circuit breaker comprises a moving contact system and a static contact system, wherein the moving contact system comprises a plurality of moving contact blades, a moving contact, a contact support, a first rotating shaft and a contact spring; the plurality of movable contact blades comprise a middle sequence movable contact blade and two side movable contact blades, wherein the middle sequence movable contact blade is a movable contact blade with an arc striking angle.
The moving contact piece is in a Venturi nozzle type, and the moving contact pieces on two sides of the moving contact piece are moving contact pieces without an arc striking angle. The Venturi nozzle type movable contact piece arc striking angle is more outstanding, so that the movable contact piece can be contacted with a static contact system earlier when short circuit is broken, the breaking movement time of the movable contact piece is shortened, the nozzle type movable contact piece is arranged, the electric arc area can be reduced, the pressure difference is generated, the flow speed of free gas is improved, and electric arc is quickly pushed into an upper arc extinguish chamber.
Or the middle sequence movable contact blade and the two side movable contact blades are provided with arc striking angles, and the alpha angle of the middle sequence movable contact blade is larger than the alpha angles of the two side movable contact blades. The angle α is an included angle between a connection line of the second rotating shaft 9 and the third rotating shaft 11 and the upper end surface of the movable contact piece 3.
When short circuit is broken, the arc striking angle of the middle sequence moving contact piece is later than the arc striking angles of the moving contact pieces on the two sides to be disconnected with a static contact system, electric arcs are concentrated on the middle sequence moving contact piece when the short circuit is broken by the aid of the structure, and the electric arcs quickly enter the arc extinguishing chamber along the surface of the arc striking piece.
Furthermore, the alpha angle of the middle sequence movable contact blade is 1-2 degrees larger than the alpha angles of the movable contact blades at the two sides.
The upper end of the insulating partition wall supported by the contact is provided with a plurality of slots matched with the moving contact pieces, and each moving contact piece is clamped into the slot and is contacted with the contact spring.
The contact support is provided with a spring groove, the lower end face of the spring groove is circular, the upper end face of the spring groove is oval, the torsional deformation of a contact spring in the switching-on and switching-off process can be reduced, the two sides of the contact support are provided with process holes, and shafts for adjusting the position of the contact spring are arranged in the process holes. The spring groove is provided with two rows, when the assembly is carried out, the contact spring is firstly placed into the spring groove, then the shaft for adjusting the position of the contact spring penetrates through the fabrication hole, the shaft is positioned between the two rows of contact springs and can limit the left and right positions of the contact spring, then the movable contact blade is placed, the contact spring can smoothly enter the movable contact blade, the contact spring abuts against the cavity, and the shaft is pulled out after the assembly is completed.
The movable contact piece is provided with a contact spring positioning boss in a shape of a waist circle, an ellipse or a rectangle. Two spring positioning bosses are arranged on each moving contact piece, are respectively positioned in the two contact springs abutting against the cavity and respectively correspond to the two contact springs, and the contact springs can be prevented from deviating from the normal position when the moving contact system is assembled or is switched on or off.
The moving contact system also comprises a moving bus bar, a flexible connection, a side plate, a second rotating shaft, a connecting rod, a third rotating shaft, an arc isolation cover and a first insulating liner;
the movable contact piece and the movable busbar are respectively welded at two ends of the flexible connection, the movable busbar is installed on a second rotating shaft and can rotate around the second rotating shaft, two sides of the movable contact pieces are fixed through a pair of side plates which are arranged in parallel, one end of each of the two side plates is fixed on the second rotating shaft, the other end of each of the two side plates is fixed on the side plates on two sides of the contact support, an arc shield covers the contact support, a third rotating shaft is connected with a connecting rod below the contact support, the connecting rod is connected with a circuit breaker main shaft, the circuit breaker main shaft can drive the movable contact system to swing to realize closing or separation with a static contact system after rotating, and a first insulating liner is installed between the side.
Furthermore, the arc-isolating cover is provided with an insulating partition wall, so that the moving contact pieces can be prevented from being adhered by metal ions after being disconnected, and the parallel branch number of the moving contact system is prevented from being influenced.
The static contact system comprises a static bus, a static contact, an arc striking plate and a second insulating liner, and the second insulating liner is arranged between the arc striking plate and the static bus;
the surface of the arc striking plate is plated with copper, and the width D of the arc striking plate is 2-3mm larger than the total width D of the middle sequence movable contact blade.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the arc striking speed is fast, and the breaking capacity is high: the moving contact system adopts a Venturi nozzle type or a type with a larger alpha angle of a middle sequence, so that the arc striking speed is higher and the breaking capacity is higher;
(2) have spring installation location adjustment function: the arrangement of the slots and the process holes can adjust the position of the contact spring when the moving contact system is tightly pressed and assembled, so that the installation is simpler and more convenient, and the flexibility is stronger;
(3) the stability is strong: the lower end face of the spring groove is set to be circular, and the upper end face of the spring groove is set to be oval, so that the distortion and deformation of the contact spring in the opening and closing process are reduced, and the stability of the device is enhanced;
(4) the reliability is high: the movable contact piece is provided with the contact spring positioning boss, so that the contact spring is prevented from deviating from the normal position when the movable contact system is assembled or used in opening and closing, and the reliability of the device is improved.
Drawings
Fig. 1 is a schematic diagram of a switching state of the contact system of the present invention;
fig. 2 is a schematic view of the moving contact system of the present invention;
fig. 3 is a perspective view of the moving contact system of the present invention;
fig. 4 is a schematic view of the contact support of the present invention;
fig. 5 is a schematic view of the static contact system of the present invention;
FIG. 6 is a schematic view of the movable contact blade of the present invention;
FIG. 7 is a schematic structural view of a double-sided movable contact blade;
FIG. 8 is a schematic structural view of an intermediate movable contact blade;
FIG. 9 is a schematic view of the arc-isolating cover of the present invention;
FIG. 10 is a schematic diagram showing the comparison between the width of the striking plate and the total width of the middle sequence movable contact blade of the present invention;
in the figure: 1-moving busbar, 2-flexible connection, 3-moving contact blade, 301-contact spring positioning boss, 302-flexible connection hole, 303-first shaft hole, 304-contact spring abutting cavity, 305-arc striking angle, 4-moving contact, 5-contact support, 501-spring groove, 502-fabrication hole, 503-slotting, 6-side plate, 7-first rotating shaft, 8-contact spring, 9-second rotating shaft, 10-connecting rod, 11-third rotating shaft, 12-arc isolating cover, 1201-insulating isolating wall, 1202-shaft hole, 13-insulating liner I, 14-static busbar, 15-static contact, 16-arc striking blade, 17-insulating liner II, m-middle sequence moving contact blade, n-two-side moving contact blade, d-the width of the arc striking plate and D-the total width of the moving contact plate in the middle sequence.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than in the nature should be considered as the protection scope of the present invention.
Example 1
As shown in fig. 1 to 9, a contact system of a low-voltage circuit breaker includes a moving contact system and a static contact system, wherein the moving contact system includes a moving busbar 1, a flexible connection 2, a contact blade 3, a contact support 5, a side plate 6, a first rotating shaft 7, a contact spring 8, a second rotating shaft 9, a connecting rod 10, a third rotating shaft 11, an arc-isolating cover 12 and an insulating liner 13; as shown in fig. 2-3.
The contact blade 3 has a plurality of contact blades, 9 contact blades are taken as an example in the embodiment, nine contact blades 3 are connected to a first rotating shaft 7 side by side through first shaft holes 303 on the nine contact blades and can rotate around the first rotating shaft 7, the first rotating shaft 7 is installed on a contact support 5, and a contact spring 8 is installed on the contact support 5; the nine moving contact pieces 3 comprise five middle sequence moving contact pieces m and four two side moving contact pieces n, wherein the middle sequence moving contact piece m is a moving contact piece with an arc striking angle 305 (as shown in figures 6 and 8), and the two side moving contact pieces n are moving contact pieces with arc striking angles; as shown in fig. 7, the angle α (23-25 degrees) of the middle sequence of movable contact blades is greater than the angle α (22-23 degrees) of the movable contact blades at the two sides, and the angle α is the angle between the connection line of the second rotating shaft 9 and the third rotating shaft 11 and the upper end surface of the movable contact blade 3. As shown in fig. 7-8, the comparison between the movable contact piece with the striking angle 305 and the movable contact pieces on both sides shows that the striking angle of the striking angle 305 with the movable contact piece is more prominent than that of the common movable contact piece, so that the common movable contact piece contacts the static contact system earlier when the short circuit is broken, the breaking motion time of the movable contact piece is accelerated, and the movable contact piece is set to be in a nozzle type by utilizing the venturi effect, so that the space can be reduced to generate pressure difference, the flow rate of free gas is increased, and the arc is pushed into the upper arc extinguish chamber quickly.
As shown in fig. 6, the movable contact piece 3 is of a venturi type, two contact springs are arranged on the inner side of each movable contact piece 3 to abut against the cavity 304, and a spring positioning boss 301 is arranged in the contact spring abutting against cavity 304, and is shaped like a waist circle, so that the contact spring 8 can be prevented from deviating from a normal position when the movable contact system is assembled or used in a switching-on/off state. The outer side of each moving contact piece 3 is provided with a moving contact 4 which is connected or disconnected with a static contact 15 of a static contact system.
The movable contact blades 3 are connected with a movable busbar 1 through flexible connections 2, the movable busbar 1 is installed on a second rotating shaft 9 and can rotate around the second rotating shaft 9, two sides of the movable contact blades 3 are fixed through a pair of side plates 6 which are arranged in parallel, one ends of the two side plates 6 are fixed on the second rotating shaft 9, the other ends of the two side plates are fixed on two sides of a contact support 5, an arc isolation cover 12 covers the contact support 5, shaft holes 1202 are formed in the side plates on two sides of the arc isolation cover 12 and are screw installation holes for fixing the arc isolation cover on the side plates 6, a third rotating shaft 11 is connected with a connecting rod 10 located below the contact support 5, the connecting rod 10 is connected with a main shaft of a circuit breaker, the main shaft of the circuit breaker can drive the movable contact system to swing after rotating, closing or separation of the movable contact system is achieved, and an insulation liner.
As shown in fig. 4, nine slots 503 matched with the movable contact blades 3 are formed at the upper ends of the insulating partition walls of the contact support 5, and each movable contact blade 3 is clamped in the slot 503 and is combined with the contact spring 8 for contact. And the contact support 5 is provided with a spring groove 501, the lower end surface of the spring groove 501 is circular, the upper end surface of the spring groove 501 is oval, the two sides of the contact support 5 are also provided with fabrication holes 502, and a shaft for adjusting the position of the contact spring 8 is arranged in the fabrication hole 502. The spring slot 501 is provided with two rows, during assembly, the contact spring 8 is firstly placed in the spring slot 501, then a shaft for adjusting the position of the contact spring 8 penetrates through the fabrication hole 502, the shaft is positioned between the two rows of contact springs 8 and can limit the left and right positions of the contact spring 8, and then the movable contact blade 3 is placed, so that the contact spring 8 can smoothly enter the movable contact blade 3 and the contact spring abuts against the cavity 304.
As shown in fig. 9, an insulating partition 1201 is further disposed on the arc-isolating cover 12 to prevent the movable contact piece 3 from being adhered by metal ions after being broken, which affects the parallel count of the movable contact system.
The static contact system comprises a static busbar 14, a static contact 15, an arc striking sheet 16 and a second insulating liner 17, wherein the second insulating liner 17 is arranged between the arc striking sheet 16 and the static busbar 14. As shown in fig. 1. The surface of the arc striking plate 16 is plated with copper, and the width D of the arc striking plate 16 is 1mm larger than the total width D of the middle sequence movable contact blade m. As shown in fig. 10.
The installation process of this embodiment is: firstly, a first rotating shaft 7 is inserted into a first shaft hole 303 of a plurality of movable contact blades 3 to connect the plurality of movable contact blades in parallel, then a contact spring 8 is installed in a spring groove 501 of a contact support 5, then a spring adjusting shaft is inserted through a process hole 502, then the movable contact blades are combined in parallel and the first rotating shaft 7 is installed on the contact support 5, so that each movable contact blade 3 is clamped into a groove 503 on the contact support 5 and is contacted with the contact spring 8, the position of the contact spring 8 is adjusted through a shaft inserted into the process hole 502, the contact spring 8 can smoothly enter a contact spring abutting cavity 304 on the movable contact blade 3 to be positioned, and finally the spring adjusting shaft is pulled out. Other parts are mounted in place. The full breaking time is shortened by 5ms, and the arcing time is shortened by 3 ms.
Example 2
In the embodiment, the middle sequence movable contact blade m and the two side movable contact blades n are both provided with the run-on angles 305, the alpha angle of the middle sequence movable contact blade m is 1-2 degrees larger than the alpha angle of the two side movable contact blades n, the run-on angles 305 of the middle sequence movable contact blade m are later disconnected with a static contact system than the run-on angles 305 of the two side movable contact blades n in short circuit breaking, by utilizing the structure, electric arcs are concentrated on the middle sequence movable contact blade m in short circuit breaking, the electric arcs quickly enter an arc extinguish chamber along the surfaces of the run-on blades 16, and the width D of the run-on blades 16 is 2-3mm larger than the total width D of the middle sequence movable contact blade m. The rest of the structure of this embodiment is the same as embodiment 1.
Claims (10)
1. A contact system of a low-voltage circuit breaker comprises a moving contact system and a static contact system, wherein the moving contact system comprises a plurality of moving contact blades (3), a moving contact (4), a contact support (5), a first rotating shaft (7) and a contact spring (8), the moving contact (4) is positioned on the moving contact blades (3), the plurality of moving contact blades (3) are connected to the first rotating shaft (7) in parallel and can rotate around the first rotating shaft (7), the first rotating shaft (7) is arranged on the contact support (5), and the contact spring (8) is arranged on the contact support (5); the movable contact mechanism is characterized in that the movable contact blades (3) comprise a middle sequence movable contact blade and two side movable contact blades, wherein the middle sequence movable contact blade is a movable contact blade with an arc striking angle (305).
2. Contact system for a low-voltage circuit breaker according to claim 1, characterized in that said moving contact blade (3) is of the venturi nozzle type, the moving contact blades on both sides of which are moving contact blades without arcing horns.
3. Contact system for a low-voltage circuit breaker according to claim 1, characterized in that said middle sequence of moving contact blades and said two side moving contact blades are provided with run-out angles (305), and the angle α of the middle sequence of moving contact blades is greater than the angle α of the two side moving contact blades.
4. A contact system of a low-voltage circuit breaker according to claim 3, characterized in that the angle α of the middle sequence of movable contact blades is 1-2 degrees larger than the angle α of the movable contact blades at both sides.
5. Contact system for a low-voltage circuit breaker according to claim 1, characterized in that the upper end of the insulating partition of the contact support (5) is provided with a plurality of slots (503) matching with the movable contact blades (3), and each movable contact blade (3) is clamped into the slot (503) and contacts with the contact spring (8).
6. Contact system of a low-voltage circuit breaker according to claim 1, characterized in that the contact support (5) is provided with a spring slot (501), the lower end surface of the spring slot (501) is circular, the upper end surface is oval, and the two sides of the contact support (5) are provided with fabrication holes (502).
7. Contact system of a low-voltage circuit breaker according to claim 1, characterized in that the movable contact blade (3) is provided with a contact spring positioning boss (301) in the shape of a waist circle, an ellipse or a rectangle.
8. The contact system of a low-voltage circuit breaker according to claim 1, characterized in that said moving contact system further comprises a moving busbar (1), a flexible connection (2), a side plate (6), a second rotating shaft (9), a connecting rod (10), a third rotating shaft (11), an arc-isolating cover (12) and a first insulating liner (13);
move contact piece (3) and connect through flexible coupling (2) and move female arranging (1), move female arranging (1) and install on second axis of rotation (9) and can rotate around second axis of rotation (9), it is fixed through a pair of parallel arrangement's curb plate (6) to move contact piece (3) both sides a plurality of, both sides board (6) one end is fixed on second axis of rotation (9), the other end is fixed on contact support (5) both sides curb plate, contact support (5) upper shield have arc insulating cover (12), be equipped with shaft hole (1202) on arc insulating cover (12) both sides curb plate, third pivot (11) connection is located connecting rod (10) of contact support (5) below, insulating liner (13) install between curb plate (6) and third pivot (11).
9. Contact system for low-voltage circuit breakers according to claim 8, characterized in that said arc-chute (12) is provided with insulating partitions (1201).
10. The contact system of a low-voltage circuit breaker according to claim 1, wherein the static contact system comprises a static busbar (14), a static contact (15), an arc striking plate (16) and a second insulating liner (17), and the second insulating liner (17) is installed between the arc striking plate (16) and the static busbar (14);
the surface of the arc striking plate (16) is plated with copper, and the width D of the arc striking plate (16) is 2-3mm larger than the total width D of the middle sequential movable contact blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021914572.8U CN212461578U (en) | 2020-09-04 | 2020-09-04 | Contact system of low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021914572.8U CN212461578U (en) | 2020-09-04 | 2020-09-04 | Contact system of low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212461578U true CN212461578U (en) | 2021-02-02 |
Family
ID=74473776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021914572.8U Active CN212461578U (en) | 2020-09-04 | 2020-09-04 | Contact system of low-voltage circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212461578U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117457453A (en) * | 2023-12-25 | 2024-01-26 | 浙江正泰电器股份有限公司 | Arc extinguishing structure of circuit breaker and circuit breaker |
-
2020
- 2020-09-04 CN CN202021914572.8U patent/CN212461578U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117457453A (en) * | 2023-12-25 | 2024-01-26 | 浙江正泰电器股份有限公司 | Arc extinguishing structure of circuit breaker and circuit breaker |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100517534C (en) | Contact system capable of automatically change-over switching electric appliance | |
| US20230411098A1 (en) | Operating mechanism of circuit breaker | |
| CN212461578U (en) | Contact system of low-voltage circuit breaker | |
| US20230377824A1 (en) | Quick tripping device and circuit breaker | |
| EP4207238A1 (en) | Operating mechanism of circuit breaker and assembling method | |
| CN114141591A (en) | Contact system of low-voltage circuit breaker | |
| US20230377825A1 (en) | Operating mechanism of circuit breaker, and circuit breaker | |
| CN111769015B (en) | Multi-sheet type moving contact and contact system of molded case circuit breaker | |
| CN219226094U (en) | Circuit breaker | |
| CN218730514U (en) | Moving contact of electric switch and double-breakpoint rotary isolating switch | |
| EP4207236A1 (en) | Moving contact mechanism | |
| CN216749679U (en) | Rotating switch moving contact component for physically isolating electric arc | |
| CN215183824U (en) | Circuit breaker arc extinguish chamber and circuit breaker | |
| CN218769179U (en) | Contact mechanism for automatic change-over switch | |
| CN107706063B (en) | Novel arc extinguishing grid piece and arc extinguishing chamber thereof | |
| CN217086445U (en) | Rotary switch for electric appliance | |
| CN111769016A (en) | Multi-contact-finger moving contact and contact system of molded case circuit breaker | |
| CN210575623U (en) | Switch | |
| CN220381951U (en) | Arc extinguishing system | |
| CN220253163U (en) | Circuit breaker with contact cover | |
| CN216120163U (en) | Arc extinguish chamber of frame type circuit breaker | |
| CN220731440U (en) | Contact arc extinguishing system of circuit breaker | |
| CN221282024U (en) | Arc extinguishing device and automatic change-over switch | |
| CN218241754U (en) | Contact system of dual-power automatic transfer switch | |
| CN220456302U (en) | Contact system of rotary isolating switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |