Contact pressure control mechanism for molded case low-voltage circuit breaker
A low-voltage circuit breaker, contact pressure technology, applied in the direction of protection switch operation/release mechanism, etc., can solve the problem of not solving the contact pressure, affecting the temperature rise and change of the circuit breaker, etc. Improve opening speed and stable performance
Active Publication Date: 2014-09-24
EATON HUINENG LOW-VOLTAGE ELECTRICAL (JIANGSU) CO LTD
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AI Technical Summary
Problems solved by technology
Although this structure can reliably block the moving contact 10 and make the circuit breaker have a current limiting capability, it has the following disadvantages: 1. The volume is too large
In order to ensure sufficient arm length, the position of the spring 60 must be far away from the moving contact 10, which results in a large volume of the rotating shaft, which cannot be adapted to the structure of a low-voltage circuit breaker with a small space for the rotating shaft
2. Poor durability
Since the spring 60 is against the middle of the lever 40, and there is a certain angle between the two smooth surfaces 41, 42, the lever 40 will have a large deflection when it is stuck, causing the spring 60 to be greatly twisted and deformed. After the product is stuck once, the spring force value will be greatly reduced, which will affect the life of the low-voltage circuit breaker
3. The problem of contact pressure changes caused by contact wear is not solved
Since the compression amount of the moving contact spring and the pressure are often in a linear relationship or close to a linear relationship, the amount of contact wear affects the change of the contact pressure and the closing position of the rotating shaft, and the contact pressure of the contact directly affects the The contact resistance of the moving and static contacts will affect the temperature rise of the circuit breaker and cause the action time of the thermal release to be inaccurate.
In addition, the contact pressure also directly determines the action threshold of the aforementioned movable contact under the action of electric repulsion when an overcurrent occurs. Since the contact pressure is affected by multiple variables, it cannot be accurate, making the initial action of the movable contact current can not be accurate
Method used
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[0018] see Figure 2-6 , the low-voltage circuit breaker includes a rotating shaft 300 fixed therein, and the rotating shaft 300 rotates with the operating mechanism. The rear end of the moving contact 100 is the rotating end, and the rotating end is connected to the rotating shaft 300 through the first rotating central axis 301, so that the moving contact 100 surrounds the second rotating shaft. A rotation center shaft 301 rotates, and the first rotation center shaft 301 is parallel to the rotation axis of the rotation shaft 300 . The front end of the movable contact 100 is a movable end, and the movable end corresponds to the static contact 200 .
[0019] Located below the first central axis of rotation 301, a shaft 101 parallel to the first central axis of rotation 301 is provided on the movable contact 100; a second central axis of rotation 302 parallel to the axis 101 is provided on the rotating shaft 300 below the shaft 101 , the second rotating central shaft 302 is con...
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The invention discloses a contact pressure control mechanism of a molded case low-voltage circuit breaker. The rotating end is connected to the rotating shaft through a first rotating central shaft. There is a second rotating center shaft parallel to the shaft below the shaft, the second rotating center shaft is connected to the lower end of the lever that can rotate around it, a spring is arranged in the groove on the rotating shaft, and the front side of the upper end of the lever acts on one end of the spring , the rear side of the upper end of the lever is pressed against the shaft, the rear side of the upper end of the lever has two continuous curved surfaces, the first curved surface is close to the second rotation center axis, and the second curved surface is an arc surface; the first curved surface is pressed against the said shaft On the shaft, the shaft is located on the front side of the line connecting the two axes of the two rotating central shafts; when the second curved surface is pressed against the shaft, the center of the second curved surface is the first rotating central axis; when the rotating shaft rotates Contact pressure can be controlled throughout the range, increasing the speed of moving contact opening.
Description
technical field [0001] The invention relates to a molded-case low-voltage circuit breaker, which can automatically cut off to protect load equipment when the circuit is overloaded or short-circuited, and in particular relates to a moving contact clamping mechanism for the molded-case low-voltage circuit breaker. Background technique [0002] One of the main functions of the low-voltage circuit breaker is to break the overcurrent in the line due to short-circuit and other reasons in time to protect the line and lower-level equipment. If the low-voltage circuit breaker can cut off the circuit before the short-circuit current reaches the peak value, that is, the low-voltage circuit breaker has current limiting capability. This low-voltage circuit breaker can provide better protection for lines and downstream equipment, and at the same time can improve the breaking short-circuit current capacity of the low-voltage circuit breaker. [0003] The low-voltage circuit breaker in the ...
Claims
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IPC IPC(8): H01H71/10
Inventor袁天江张海燕
OwnerEATON HUINENG LOW-VOLTAGE ELECTRICAL (JIANGSU) CO LTD