CN201898043U

CN201898043U - Contact-terminal-falling-preventing device

Info

Publication number: CN201898043U
Application number: CN2010206169129U
Authority: CN
Inventors: 王华章; 李涛; 马丽萍; 钱兴勇; 郭强; 耿翔宇
Original assignee: Jiangsu Daqo Kfine Electric Co Ltd
Current assignee: Jiangsu Daqo Kfine Electric Co Ltd
Priority date: 2010-11-22
Filing date: 2010-11-22
Publication date: 2011-07-13
Anticipated expiration: 2020-11-22

Abstract

The utility model belongs to low-voltage electric equipment, and relates to a contact-terminal-falling-preventing device in a low-voltage circuit breaker. The contact-terminal-falling-preventing device comprises a rotating shaft body and a movable contact terminal which longitudinally passes through an inner cavity of the rotating shaft body and can rotate along the center of the rotating shaft body, wherein the movable contact terminal is centrally symmetric, and the front end and the rear end of the movable contact terminal are respectively provided with a movable contact corresponding to an upper fixed contact and a lower fixed contact on the circuit breaker; two sliding grooves are respectively arranged in front of and behind the symmetric center of the movable contact terminal, a clamping pin which stretches out towards two sides is arranged inside each sliding groove, two ends of each clamping pin are pulled by a pullback spring which is arranged at the outer side of the rotating shaft body, and the fixed end of the pullback spring is connected onto fixed pins at two sides outside the rotating shaft body; and the upper edge and the lower edge of the rotating shaft body are respectively provided with a cam surface, each cam surface consists of two concave sections on two ends and a raised section which is arranged on the middle part, and the clamping pins are always pressed against the cam surfaces and can stop on the bottom part of the two concave sections under the acting force of the pullback spring. The contact-terminal-falling-preventing device has a simple structure, is reliable to act and is convenient to manufacture and install.

Description

Anti-contact falls device

Technical field

The utility model belongs to low voltage electrical equipment, and the anti-contact that relates in a kind of low-voltage circuit breaker falls device.

Background technology

The rotating axis component of low-voltage circuit breaker generally includes rotary shaft body that is driven by breaker operating mechanism and the moving contact that is installed on the rotary shaft body.Drive the moving contact rotation by rotary shaft body during operate as normal; branch, combined floodgate between realization and the circuit breaker fixed contact; but when overcurrent takes place owing to faults such as short circuits in circuit breaker; need the contact to disconnect rapidly, carry out separating brake to move the needed time longer and utilize the protective circuit of operating mechanism to drive rotating shaft.Therefore, in order to guarantee that the contact can disconnect rapidly, the existing structure rotating axis component can directly be scolded out moving contact by the electric power between the contact before operating mechanism does not also drive rotary shaft body and carries out the separating brake action usually when overcurrent.And novel anti-contact falls the effect of device, moving contact is remained on scold open position and not again with the fixed contact conducting, wait for that rotary shaft body rotates to the separating brake position.Existing novel anti-contact falls device (as american documentation literature US005313180A and Chinese patent 200610037996.9 etc.) cam surface normally is set at the moving contact edge, utilize spring and the bayonet lock location on cam surface to realize that scolding of moving contact opened and block, this class formation exists mostly that complex structure, manufacture difficulty are big, manufacturing and installation accuracy require defectives such as height, reliable in action difference.

Summary of the invention

Technical problem to be solved in the utility model is, provides a kind of simple in structure, reliable in action, good stability manufacturing and novel anti-contact easy for installation to fall device.

Novel anti-contact of the present utility model falls device and includes the moving contact that the rotary shaft body inner chamber is run through in rotary shaft body and front and back and rotate at the axis body center that can rotate, moving contact center symmetry, its rear and front end are respectively arranged with and upper and lower two moving contacts that the fixed contact contact is corresponding of circuit breaker; Moving contact symmetrical centre forward and backward respectively is provided with a sliding tray, a bayonet lock that stretches out to both sides is arranged in the described sliding tray, each bayonet lock two ends is by a pair of extension spring traction that is positioned at the rotary shaft body outside, and the stiff end of extension spring is connected on the steady pin of rotary shaft body both sides external; The upper and lower edge of rotary shaft body respectively is provided with one section cam surface, cam surface is made up of with one section section of arching upward in the middle of being positioned at two sections depression sections that are positioned at two ends, and described bayonet lock is pressed on the cam surface under the active force of extension spring all the time and can stops bottom two depression sections.

Described rotary shaft body both sides external is provided with groove, and described extension spring is arranged in groove.

Advantage of the present invention is:

1, four independently extension spring be symmetrically distributed in the outside of rotary shaft body, easy for installation, and effectively protect extension spring, avoid electrical arc erosion;

2, cam surface is arranged on the rotary shaft body, because rotary shaft body is generally nonmetallic materials such as engineering plastics, is arranged on the cam surface that metal touches with prior art and compares, and its machine-shaping is more prone to, and the precision height;

3, moving contact is scolded and is opened the principle of blocking and be different from traditional structure, and it scolds out resistance little, and mechanism is easier to be blocked, and resetting also is more prone to, and has improved current limitation effect and reliable in action;

4, the relative motion of bayonet lock and cam surface steadily, reliably, sliding tray on the moving contact provides level of freedom for bayonet lock, make the bayonet lock axle can make easy on and off and slide, it is less to cross the Duan Shiqi resistance of motion that arches upward of cam surface at bayonet lock like this, has improved the reliability of action.

Thus, can make whole contact system simple in structure, reliable, good stability under the short circuit current condition, can effectively be protected the unburned damage of contact, has improved the breaking capacity of circuit breaker greatly.

Description of drawings

Fig. 1 is the utility model perspective view in normal operation;

To be the utility model scold out perspective view under the state at moving contact to Fig. 2;

Fig. 3 is a decomposition texture schematic diagram of the present utility model;

To be the utility model scold out structural representation under the state at moving contact to Fig. 4;

Fig. 5 is the structural representation of the utility model under the breaker closing state.

Embodiment

As shown in the figure, this novel anti-contact falls device and includes the moving contact 2 that the rotary shaft body inner chamber is run through in rotary shaft body 1 and front and back and rotate at the axis body center that can rotate, moving contact 2 center symmetries, its rear and front end are respectively arranged with and upper and lower two moving contacts 21 that fixed contact A contact is corresponding; Moving contact 2 symmetrical centre forward and backward respectively is provided with a sliding tray 22, a bayonet lock 4 that stretches out to both sides is arranged in the described sliding tray 22, each bayonet lock two ends is by a pair of extension spring 3 tractions that are positioned at the rotary shaft body outside, and the stiff end of extension spring 3 is connected on the steady pin 11 of rotary shaft body 1 both sides external; The upper and lower edge of rotary shaft body respectively is provided with one section cam surface 12, and cam surface is made up of with one section section of arching upward in the middle of being positioned at two sections depression sections that are positioned at two ends, and bayonet lock 4 is being pressed on the cam surface 12 under the active force of extension spring 3 all the time.Rotary shaft body 1 both sides external is provided with groove 13, and extension spring 3 is arranged in groove, to avoid the influence of external component to the extension spring action.

During installation, at first moving contact 2 is installed in the groove of rotating shaft 1 centre, extension spring 3 hangs on the bayonet lock 4, be symmetrically distributed in rotating shaft 1 both sides, finish installation after, moving contact is subjected to the spring pressure active force and moves together with rotating shaft, in normal operation, bayonet lock 4 rests on cam surface depression section bottom under the active force of extension spring 3, this moment, moving contact 2 can rotate with rotary shaft body 1, divides normally, feed motion.

When short circuit current process moving contact, moving contact is subjected to electrodynamic repulsion force, and the pulling force that overcomes touch spring rises rapidly, and 1 rotates around the shaft; Moving contact drives bayonet lock 4 and moves upward along the cambered surface of cam surface, and when being about to the peak near cambered surface, cambered surface promotes bayonet lock 4 and upwards slides in moving contact sliding tray 22, until stepping peak; After bayonet lock 4 is crossed the peak of the section of arching upward, be subjected to the pulling force of touch spring, fall in the cam surface depression section moving contact stop motion; Wait for that rotary shaft body rotates to the separating brake position under the driving of operating mechanism, when operating mechanism response action, pulling rotating shaft 1 makes bayonet lock 4 oppositely stride across the peak of cam surface cambered surface, gets back to initial condition.

Claims

1. a novel anti-contact falls device, include the moving contact (2) that the rotary shaft body inner chamber is run through in rotary shaft body (1) and front and back and rotate at the axis body center that can rotate, moving contact (2) center symmetry, its rear and front end is respectively arranged with last, the moving contact (21) of following two fixed contact contact correspondences, it is characterized in that: before moving contact (2) symmetrical centre, after respectively be provided with a sliding tray (22), a bayonet lock that stretches out to both sides (4) is arranged in the described sliding tray (22), each bayonet lock two ends is by a pair of extension spring (3) traction that is positioned at the rotary shaft body outside, and the stiff end of extension spring (3) is connected on the steady pin (11) of rotary shaft body (1) both sides external; The upper and lower edge of rotary shaft body respectively is provided with one section cam surface (12), and cam surface is made up of with one section section of arching upward in the middle of being positioned at two sections depression sections that are positioned at two ends, and bayonet lock (4) is being pressed under the active force of extension spring (3) on the cam surface (12) all the time.

2. novel anti-contact according to claim 1 falls device, it is characterized in that: rotary shaft body (1) both sides external is provided with groove (13), and extension spring (3) is arranged in groove.