A wide-range adjustable short-circuit electromagnetic release for plastic case

Abstract

The invention discloses a large-range adjustable short-circuit electromagnetic tripper for a molded case, which includes a moving iron core system, a static iron core system, a spring system, a conductive system and a shaft, the static iron core system is fixedly installed on the conductive system, and the dynamic The iron core system is installed on the static iron core system through the shaft. The static iron core system contains a non-working air gap and a magnetic separation piece, which can avoid the situation that the magnetic saturation of the iron core caused by excessive setting current requirements can not be adjusted; With the cooperation of the static iron core system and the spring system with adjustable force value, the moving iron core system can realize the adjustable setting value in a wide range, and the spring reaction force within this range can ensure a moderate force value, ensuring The stability of the setting value and the reliability of the release. The wide-range adjustable electromagnetic short-circuit release for plastic cases patented by the present invention has the advantages of small size, large adjustment range, high maximum setting current and impact resistance, and is suitable for occasions with limited size and high setting requirements.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a large-range adjustable short-circuit electromagnetic release for plastic cases. Background technique [0002] Molded case circuit breakers are usually current-limiting circuit breakers. When breaking the short-circuit current, the release device needs to be able to open the free release mechanism in time to prevent the contact system from falling back and burning the entire circuit breaker, and to enable the circuit breaker to be released in time. Cut off the fault current and protect the power system equipment. The performance of the electromagnetic short circuit release directly determines the performance of the molded case circuit breaker. [0003] The molded case circuit breaker has the characteristics of small frame size, which greatly limits the volume of the electromagnetic short-circuit release itself. When a high setting value is required, it is easy t...

AI Technical Summary

Problems solved by technology

[0003] The molded case circuit breaker has the characteristics of small frame size, which greatly limits the volume of the electromagnetic short-circuit release itself. When a high setting value is required, it is easy to saturate the magnetic circuit and fail to meet the design requirements.

Also due to space constraints, it is difficult to achieve a tightly balanced design for the moving iron core of the release, which cannot resist impact and has low reliability

At the same time, due to the limited design space, the setting value of the electromagnetic short-circuit release for molded cases is usually a fixed value. With the development of the times and the improvement of people's needs, there are also some electromagnetic short-circuit releases for plastic cases that can Adjustment, but most of them have a small adjustable range, low adjustment accuracy or complex adjustment mechanism, and low reliability

For some special occasions where selective protection is required, the electromagnetic short-circuit release is required to be adjustable in a wide range, the setting value is accurate and easy to adjust, and the action is stable and reliable, so it is difficult to meet the requirements.

[0004] The Chinese patent with the publication number CN101976640B discloses a low-voltage electromagnetic short-circuit release, which is currently the most commonly used structural form of molded case circuit breakers. However, due to volume limitations and limited cross-section of the iron core, the fault current will reach saturation when it reaches about 10 times , the setting value is fixed and limited, the center of gravity of the moving iron core is obviously not on the axis of rotation, and cannot resist impact

[0005] The Chinese patent with the publication number CN104779127B discloses an adjustable electromagnetic release and a circuit breaker. The junction structure is similar to the above one. The iron core is easy to be magnetically saturated and not resistant to impact. The setting value is adjusted by adjusting the working air gap, but the accuracy and adjustment range of this adjustment method are limited, and the scheme uses a rotating sleeve to realize the adjustment of the air gap. How to conveniently and quickly adjust the appropriate value when the circuit breaker leaves the factory? It is also difficult to set the value and stably fix the rotating sleeve

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