Arc extinguishing chamber of molded case low voltage circuit breaker
A low-voltage circuit breaker and arc extinguishing chamber technology, which is applied in the field of arc extinguishing chambers, can solve problems such as between magnetizing blocks, between magnetizing blocks and moving contacts, and arc re-ignition, so as to improve magnetic blowing force and quickly Entering and enhancing the effect of blowing arc magnetic field
Active Publication Date: 2011-03-16
EATON HUINENG LOW-VOLTAGE ELECTRICAL (JIANGSU) CO LTD
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Problems solved by technology
In order to increase the magnetic blowing force on the arc, one or more magnetization blocks are placed in the arc extinguishing chamber. At present, ear-shaped magnetization blocks and U-shaped magnetization blocks are generally used, but the magnetization blocks are easy to cause damage in actual use. Arc re-ignition between magnetization blocks, between magnetization blocks and moving contacts, between magnetization blocks and static contacts
Method used
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[0015] Such as Figure 1-5 As shown, the arc extinguishing chamber is a box structure composed of a housing 1 and another housing 2. The first housing 1 is a left-right symmetrical structure. The first housing 1 has a top wall 11, two side walls 12, 13 , the rear wall 14, the bottom wall 15; the rear wall 14 has a rear wall opening 141 for the moving contact to extend into the arc extinguishing chamber. There is a bottom wall opening 151 on the bottom wall 15 for the static contact to extend into the arc extinguishing chamber; there are also two bottom wall grooves 152 on the bottom wall 15, and the two grooves 152 are matched with the two legs 41 of the U-shaped magnetizer 4 , the two legs of the U-shaped magnetizing block 4 are inserted and installed in the two grooves 152 . The side wall 12 has several side wall through grooves 122 and a side wall groove 121, the groove 121 is next to the through groove 122, the arc extinguishing grid 5 is fixedly arranged on the side wall...
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The invention discloses an arc extinguishing chamber of a molded case low voltage circuit breaker, which is characterized in that a box body structure is composed of two casings, one of which adopts a bilateral symmetry structure and the other of which includes a top wall, two sidewalls, a rear wall and a bottom wall, wherein the rear wall is provided with a rear wall opening into which a moving contact can stretch, the bottom wall is provided with a bottom wall opening into which a fixed contact can stretch, the bottom wall is further provided with two grooves fitted with two legs of a U-shaped magnetizer, one sidewall is provided with a plurality of sidewall channel and a sidewall groove, the sidewall channels are fixedly provided with arc extinguishing grilles, the sidewall groove is fixedly provided with blocky magnetizers, the other sidewall has the same features as the previous sidewall; and the two blocky magnetizers, one U-shaped magnetizer and the arc extinguishing grilles form a magnetic loop structure; the arc extinguishing chamber can effectively prevent arc restriking between the magnetizers, between the magnetizers and the moving contact and between the magnetizers and the fixed contact during the breaking of circuit breaker; and the magnetic loop structure is favorable for strengthening blow-out magnetic field of the arc extinguishing chamber.
Description
technical field [0001] The invention relates to a molded case low-voltage circuit breaker, in particular to an arc extinguishing chamber of the molded case circuit breaker. Background technique [0002] At present, the housing of the arc extinguishing chamber of the molded case low-voltage circuit breaker is made of ferromagnetic material, and a U-shaped arc extinguishing grid is installed inside, and the arc is extinguished by the grid. When the circuit breaker generates an arc, due to the existence of the grid, the magnetic flux path generated by the arc current in the surrounding air is distorted, and the magnetized grid generates electromagnetic force to pull the arc to the arc extinguishing chamber, and the arc is divided and cooled by the grid , the arc resistance increases, and the arc voltage also increases. When the arc voltage reaches a certain value, the arc will be extinguished. In order to increase the magnetic blowing force on the arc, one or more magnetizatio...
Claims
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IPC IPC(8): H01H73/18
Inventor 陈咸胡义琴任飞严丽君
Owner EATON HUINENG LOW-VOLTAGE ELECTRICAL (JIANGSU) CO LTD