CN116705564A - Contact system - Google Patents

Contact system Download PDF

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Publication number
CN116705564A
CN116705564A CN202310865144.2A CN202310865144A CN116705564A CN 116705564 A CN116705564 A CN 116705564A CN 202310865144 A CN202310865144 A CN 202310865144A CN 116705564 A CN116705564 A CN 116705564A
Authority
CN
China
Prior art keywords
contact
movable
conductive
movable contact
static
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.)
Pending
Application number
CN202310865144.2A
Other languages
Chinese (zh)
Inventor
刘洪武
徐朝政
陈会林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changshu Switchgear Manufacturing Co Ltd
Original Assignee
Changshu Switchgear Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Changshu Switchgear Manufacturing Co Ltd filed Critical Changshu Switchgear Manufacturing Co Ltd
Priority to CN202310865144.2A priority Critical patent/CN116705564A/en
Publication of CN116705564A publication Critical patent/CN116705564A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/08—Terminals; Connections
    • 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

Landscapes

  • Breakers (AREA)

Abstract

A contact system belongs to the technical field of piezoelectric devices. The movable contact is electrically connected with the static conductive bar, the movable contact is electrically connected with the movable conductive bar through conductive flexible connection, the movable contact is contacted with or separated from the static contact after acting, the static conductive bar, the static contact, the movable contact, the conductive flexible connection and the movable conductive bar form a 'shape' circuit, the movable contact comprises a movable contact piece and a pin shaft, the movable contact piece is arranged on the movable contact piece through pin shaft rotation, and the movable contact and the conductive flexible connection of the movable contact piece are respectively positioned on two sides of the pin shaft, and the movable contact is characterized in that: the movable conductive bar is provided with a first U-shaped conductor with a downward notch at a position close to the conductive flexible connection, and when the circuit breaker bears current, the first U-shaped conductor generates an electric repulsive force to the conductive flexible connection. The advantages are that: the contact pressure between the movable contact and the fixed contact can be increased, and the short-circuit resistance of the circuit breaker is improved.

Description

Contact system
Technical Field
The application belongs to the technical field of piezoelectric devices, and particularly relates to a contact system.
Background
Circuit breakers and disconnectors are two electrical devices commonly used in power systems, and their main function is to power down or isolate the power supply in the circuit, so as to achieve the purpose of protecting the electrical devices and personal safety.
The universal circuit breaker is often used for a near power end and matched with a lower circuit breaker. In order to realize the function of selective protection, the universal circuit breaker must have a certain short-time tolerance, otherwise, when a short-circuit fault occurs in a lower-stage branch, the selective protection function of the universal circuit breaker will fail, and thus a large-area power failure is caused.
The isolating switch is a power isolating device which is arranged at the low-voltage outlet end or the branch outlet end of a transformer or power generating equipment and is matched with electrical equipment such as a breaker, a fuse and the like for use. When the frame type isolating switch is matched with the fuse for use, the isolating switch is not capable of breaking fault current and is mainly broken by fusing the fuse, however, the isolating switch must be kept in a closed state in the fusing process of the fuse, and therefore, the frame type isolating switch also needs higher short-time tolerance.
At present, a common method for improving the short-time tolerance level of the universal circuit breaker and the frame type isolating switch is to increase the number of contact blades of a single pole, but too much depending on the increase of the contact blades can increase the copper consumption and the size of the single pole, so that the cost is increased and the economy is reduced.
In view of the foregoing prior art, a technical solution for improving the short tolerance index of a circuit breaker in the existing structural form of the circuit breaker is urgently needed by those skilled in the art, and for this purpose, the present inventors have made beneficial designs, and the technical solutions to be described below are generated in this context.
Disclosure of Invention
The application aims to provide a contact system which is simple and reasonable in structure, can increase the contact pressure between a moving contact and a static contact and improves the short-term performance of a circuit breaker.
The application aims at achieving the purpose, and the contact system comprises a moving contact, a fixed conducting bar and a moving conducting bar, wherein the fixed contact is electrically connected with the fixed conducting bar, the moving contact is electrically connected with the moving conducting bar through a conductive flexible connection, the moving contact is contacted with or separated from the fixed contact after acting, the fixed conducting bar, the fixed contact, the moving contact, the conductive flexible connection and the moving conducting bar form a 'shaped' circuit, the moving contact comprises a moving contact piece and a pin shaft, the moving contact piece is arranged on the moving contact through the pin shaft in a rotating mode, the moving contact and the conductive flexible connection of the moving contact piece are respectively positioned on two sides of the pin shaft, a first U-shaped conductor with a notch facing downwards is arranged at a position close to the conductive flexible connection, and when a circuit breaker bears current, the first U-shaped conductor generates an electric repulsive force to the conductive flexible connection.
In a specific embodiment of the application, the movable contact further comprises a contact support, the movable contact is rotatably arranged on the contact support through a pin shaft, a contact spring is arranged between the movable contact and the contact support, one end of the contact spring is propped against the contact support, and the other end of the contact spring is propped against the movable contact.
In another specific embodiment of the present application, the first U-shaped conductor is integrally formed during the forming of the follow-up conductor.
In another specific embodiment of the present application, the first U-shaped conductor is separately disposed from the movable conductive bar, the movable conductive bar includes a first horizontal bar and a second horizontal bar that are separately disposed, the first U-shaped conductor is located between the first horizontal bar and the second horizontal bar, and two ends of the first U-shaped conductor are fixedly and electrically connected to the first horizontal bar and the second horizontal bar, respectively.
In yet another embodiment of the present application, the stationary conductor bar and the movable conductor bar are both outgoing to the rear side of the circuit breaker.
In still another specific embodiment of the present application, the outgoing line direction of the static conductive bar is an upper side, and the outgoing line direction of the moving conductive bar is a lower side.
In a further specific embodiment of the present application, the static conductive bar and the static contact form a second U-shaped conductor, and a notch of the second U-shaped conductor faces upwards.
Due to the adoption of the structure, compared with the prior art, the application has the beneficial effects that: because the first U-shaped conductor is additionally arranged on the movable conducting bar, when the circuit breaker bears current, the first U-shaped conductor can apply an electric repulsive force to the conductive flexible connection, and the electric repulsive force can be converted into contact pressure through a lever principle, so that the short-term performance of the circuit breaker can be improved; in addition, a second U-shaped conductor is additionally arranged on one side of the static conductive bar, and electric repulsive force formed by the second U-shaped conductor can accelerate the electric arc to move upwards, so that the arc extinguishing speed is increased.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present application;
FIG. 2 is a schematic diagram of a second embodiment of the present application;
FIG. 3 is a schematic diagram of a third embodiment of the present application;
FIG. 4 is a schematic structural view of a fourth embodiment of the present application;
fig. 5 is a schematic structural view of a fifth embodiment of the present application.
In the figure: 1. the device comprises a movable contact, a movable contact piece, a movable contact, a pin shaft, a conductive flexible connection and a contact spring, wherein the movable contact is 11; 2. a stationary contact, 21. A stationary contact; 3. static conductive bar, 31. Second U-shaped conductor; 4. moving conductor row 41. First U-shaped conductor 42. First horizontal row 43. Second horizontal row.
Detailed Description
The following detailed description of specific embodiments of the application, while given in connection with the accompanying drawings, is not intended to limit the scope of the application, and any changes that may be made in the form of the inventive concepts described herein, without departing from the spirit and scope of the application.
In the following description, all concepts related to the directions (or azimuths) of up, down, left, right, front and rear are directed to the position states where the drawings are being described, so as to facilitate public understanding, and thus should not be construed as being particularly limiting to the technical solutions provided by the present application.
Example 1
The application relates to a circuit breaker, which comprises a contact system, wherein when the circuit breaker is opened or closed, the contact system correspondingly performs closing action, namely, the circuit breaker completes the opening or closing action through the opening or closing of the contact system. In general, an operating mechanism is also provided in the circuit breaker, and the operating mechanism is used for driving the contact system to perform combined operation.
As shown in fig. 1, the contact system comprises a moving contact 1, a fixed contact 2, a fixed conductive bar 3 and a moving conductive bar 4. The moving contact 1 contacts or separates from the fixed contact 2 after acting, so that the switching-on or switching-off of the circuit breaker is realized. The static conductive bar 3 is electrically connected with the static contact 2 and is used for outgoing lines at the side of the static contact 2; the movable conductive bar 4 is electrically connected with the movable contact 1 through a conductive flexible connection 13, and the movable conductive bar 4 is used for outgoing lines on the side of the movable contact 1.
Specifically, the movable contact 1 includes a movable contact 11, a pin 12, a conductive flexible connection 13, and a contact support (not shown in the figure). One end of the conductive flexible connection 13 is electrically connected with the movable contact 11, and the other end is electrically connected with the movable conductive bar 4, so that the electric connection between the movable contact 11 and the movable conductive bar 4 is realized.
The static conductive bar 3, the static contact 2, the movable contact 1, the conductive flexible connection 13 and the movable conductive bar 4 form a "]" circuit, wherein the static conductive bar 3 and the movable conductive bar 4 are positioned at the upper end and the lower end of the same side of the static contact 2, the movable contact 1 and the conductive flexible connection 13.
The movable contact 11 is rotatably arranged on the contact support through a pin shaft 12. A contact spring 14 is arranged between the movable contact 11 and the contact support, one end of the contact spring 14 is propped against the contact support, and the other end is propped against the movable contact 11 to provide contact pressure for the movable contact 11. The movable contact 11 is provided with a movable contact 111, the fixed contact 2 is provided with a fixed contact 21, and the fixed contact 21 is in contact fit with the movable contact 111.
When the moving contact 1 contacts with the fixed contact 2 and is in a closed state, the moving contact 11 is pivoted on the contact support through the pin shaft 12, so that the moving contact 11 can be used as a lever system, the rotation center of the lever is the pin shaft 12, the moving contact 111 and the conductive flexible connection 13 are respectively positioned at two sides of the pin shaft 12, namely, the moving contact 111 and the conductive flexible connection 13 are respectively positioned at two sides of the lever.
Continuing to see fig. 1, the static conductive bar 3 and the movable conductive bar 4 are both led out to the rear side of the circuit breaker. The technical point of this scheme lies in that movable conductive strip 4 be equipped with breach first U-shaped conductor 41 down in the position that is close to electrically conductive flexible coupling 13. It is known that the interaction between current and current is achieved by a magnetic field, with co-current attracting each other and counter-current repelling each other. After the movable conductive strip 4 is provided with the first U-shaped conductor 41 with the above structure, the current direction of the side of the first U-shaped conductor 41 close to the conductive flexible connection 13 is opposite to the current direction in the conductive flexible connection 13, so that the first U-shaped conductor 41 can generate an electric repulsive force on the conductive flexible connection 13, the electric repulsive force is a pushing force F1 schematically shown in the figure for pushing the conductive flexible connection 13 away, and after the pushing force F1 is acted by the lever of the pin shaft 12, a pressure F2 for applying force towards the stationary contact 21 is formed on the movable contact 111. At this time, the contact pressure between the moving contact 1 and the fixed contact 2 is increased, and then the contact pressure is increased, so that the short-tolerance performance of the circuit breaker is improved.
In this embodiment, the first U-shaped conductor 41 is integrally formed when the follow-up conductive strip 4 is formed.
Example 2
Referring to fig. 2, the difference between the present embodiment and embodiment 1 is that: the first U-shaped conductor 41 is an independent component, that is, the first U-shaped conductor 41 and the movable conductive bar 4 are separately arranged. Specifically, the movable conductive strip 4 includes a first horizontal strip 42 and a second horizontal strip 43 that are separately disposed, the first U-shaped conductor 41 is located between the first horizontal strip 42 and the second horizontal strip 43, and two ends of the first U-shaped conductor 41 are fixedly and electrically connected to the first horizontal strip 42 and the second horizontal strip 43, respectively, so that the first U-shaped conductor 41 and the movable conductive strip 4 are fixedly installed to form a whole.
Example 3
Referring to fig. 3, the difference between the present embodiment and embodiment 1 is that: the static conductive bars 3 and the movable conductive bars 4 are provided with outgoing lines in the vertical direction, namely, the outgoing line direction of the static conductive bars 3 faces upwards, and the outgoing line direction of the movable conductive bars 4 faces downwards.
Example 4
Referring to fig. 4, in the present embodiment, the stationary conductive strip 3 and the stationary contact 2 form a second U-shaped conductor 31, and a notch of the second U-shaped conductor 31 faces upward. The current flows from the stationary contact 21 and through the second U-shaped conductor 31 to the stationary conductive bar 3, and in the above structure, the electric arc is in the same direction as the current at the U-shaped bottom of the second U-shaped conductor 31, and the electric repulsive force thus formed can accelerate the upward movement of the electric arc, so that the electric arc can quickly enter the arc extinguishing chamber (not shown in the figure) of the circuit breaker.
Example 5
Referring to fig. 5, the difference between the present embodiment and embodiment 4 is that: the static conductive bars 3 and the movable conductive bars 4 are provided with outgoing lines in the vertical direction, namely, the outgoing line direction of the static conductive bars 3 faces upwards, and the outgoing line direction of the movable conductive bars 4 faces downwards.
In the above embodiments, since the first U-shaped conductor 41 is added to the movable conductive strip 4 and the notch of the first U-shaped conductor 41 faces downward, when the circuit breaker carries current, the first U-shaped conductor 41 can apply an electric repulsive force to the conductive flexible connection 13, and the electric repulsive force is transferred to the movable contact 111 through the leverage of the pin 12 and is converted into a contact pressure applied by the movable contact 111 to the stationary contact 21, thereby improving the short-circuit performance of the circuit breaker.
More preferably, a second U-shaped conductor 31 is also arranged at one side of the static conductive bar 3, and a notch of the second U-shaped conductor 31 faces upwards, so that an electric repulsive force formed by the second U-shaped conductor can accelerate the electric arc to move upwards quickly and enter an arc extinguishing chamber (not shown in the figure) of the circuit breaker.

Claims (7)

1. The utility model provides a contact system, includes moving contact (1), static contact (2), static conductive strip (3) and moving conductive strip (4), static contact (2) with static conductive strip (3) electricity be connected, moving contact (1) through conductive flexible coupling (13) with moving conductive strip (4) electricity be connected, moving contact (1) realize with contact or the separation of static contact (2) after acting, static conductive strip (3), static contact (2), moving contact (1), conductive flexible coupling (13) and moving conductive strip (4) constitute a ] shape circuit, moving contact (1) include movable contact (11) and round pin axle (12), movable contact (11) are through round pin axle (12) rotation setting on moving contact (1), movable contact (111) and conductive flexible coupling (13) of movable contact (11) be located respectively round pin axle (12) both sides, its characterized in that: the movable conductive bar (4) is provided with a first U-shaped conductor (41) with a downward notch at a position close to the conductive flexible connection (13), and when the circuit breaker bears current, the first U-shaped conductor (41) generates an electric repulsive force on the conductive flexible connection (13).
2. The contact system according to claim 1, wherein the movable contact (1) further comprises a contact support, the movable contact (11) is rotatably arranged on the contact support through a pin shaft (12), a contact spring (14) is arranged between the movable contact (11) and the contact support, one end of the contact spring (14) is propped against the contact support, and the other end of the contact spring is propped against the movable contact (11).
3. A contact system according to claim 1, characterized in that said first U-shaped conductor (41) is integrally formed with said follower conductor (4).
4. A contact system according to claim 1, characterized in that the first U-shaped conductor (41) is arranged separately from the movable conductive row (4), the movable conductive row (4) comprises a first and a second horizontal row (42, 43) arranged separately, the first U-shaped conductor (41) is arranged between the first horizontal row (42) and the second horizontal row (43), and both ends are fixedly and electrically connected to the first horizontal row (42) and the second horizontal row (43), respectively.
5. A contact system according to claim 1, characterized in that the stationary conductor bar (3) and the movable conductor bar (4) are both outgoing to the rear side of the circuit breaker.
6. A contact system according to claim 1, characterized in that the outgoing line direction of the stationary conductor bar (3) is the upper side and the outgoing line direction of the movable conductor bar (4) is the lower side.
7. A contact system according to claim 1, characterized in that the stationary conductor bar (3) and the stationary contact (2) form a second U-shaped conductor (31), the gap of the second U-shaped conductor (31) facing upwards.
CN202310865144.2A 2023-07-14 2023-07-14 Contact system Pending CN116705564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310865144.2A CN116705564A (en) 2023-07-14 2023-07-14 Contact system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310865144.2A CN116705564A (en) 2023-07-14 2023-07-14 Contact system

Publications (1)

Publication Number Publication Date
CN116705564A true CN116705564A (en) 2023-09-05

Family

ID=87845257

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310865144.2A Pending CN116705564A (en) 2023-07-14 2023-07-14 Contact system

Country Status (1)

Country Link
CN (1) CN116705564A (en)

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