Electric energy meter external circuit breaker

2021-05-09

There is no limit to creativity, and the instrument is invented. Today we introduce a national invention patent for authorization - an electric meter external Circuit breaker . The patent was filed by Wenzhou Shengpu Electric Co., Ltd. and was authorized to be announced on March 15, 2017.

Description
The invention relates to the field of automatic control of low-voltage electrical appliances, in particular to an external Circuit Breaker for electric energy meters.

Background of the invention
In order to realize the intelligent control of the national power supply network, in February 2015, State Grid Corporation announced a technical specification for an external circuit breaker for electric energy meters, which required small external circuit breakers to be used in conjunction with miniature circuit breakers. During the use of the circuit breaker, the external circuit breaker is in the manual state, and the miniature circuit breaker cannot be closed when the arrears are in arrears; it is also required that the electric circuit breaker external circuit breaker must be powered when the miniature circuit breaker is closed. In the state of detachment, at present, there are no products and control schemes that fully comply with the specification at home and abroad.

Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a power circuit breaker external circuit breaker in the case of opening, the miniature circuit breaker can not be closed when the arrears are owed, and the external circuit breaker of the electric energy meter is realized after the closing Power meter external circuit breaker with power off.

The technical solution of the present invention is realized as follows: an electric energy meter external circuit breaker, comprising: an electric closing mechanism linked with a handle of a plurality of miniature circuit breakers; and a tripping mechanism associated with the electric closing mechanism, The electric closing mechanism comprises a planar vertical tooth driven wheel, an umbrella driving wheel and a Motor, and the planar vertical tooth driven wheel is linked with a handle of a plurality of miniature circuit breakers through a transmission shaft, the umbrella driving wheel comprises an umbrella driving wheel body And a transmission column disposed on a side of the umbrella-shaped driving wheel body, the side of the transmission column is provided with a transmission tooth, the transmission tooth meshes with the planar vertical tooth driven wheel, and the stroke of the transmission tooth and the stroke of the handle of the plurality of miniature circuit breakers Equally, the motor is coupled to the umbrella drive wheel body through the transmission Bevel gear.

Preferably, the trip mechanism includes a movable slot disposed on the other side of the umbrella-shaped drive wheel body and a toggle spring disposed in the movable slot, the tail portion of the toggle spring being fixedly coupled with the movable slot, and the spring is biased A movable margin is formed between the middle portion and the movable slot, and the head of the toggle spring is movably connected with the trip pin of the miniature circuit breaker, and the trip pin of the miniature circuit breaker is located on the moving path of the head of the toggle spring.

The control mechanism further includes a permanent magnet and a conductive elastic piece, and the conductive elastic piece includes a contact piece that is lifted upward at one end, and the permanent magnet is embedded on the Other side of the umbrella-shaped driving wheel body. The other side of the umbrella-shaped driving wheel body is provided with an arc-shaped stopper and a positioning block distributed around the arc-shaped stopper, and the head of the toggle spring is distributed along the inner surface of the arc-shaped stopper, and the spring is turned The head is clamped on the arc-shaped stopper, the middle of the toggle spring is in the shape of an arc, and the middle of the toggle spring has a gap with the outer surface of the arc-shaped stopper, and the tail of the toggle spring extends beyond the edge of the umbrella-shaped drive wheel body Settings. The other side of the umbrella-shaped driving wheel body is provided with a blocking post, which is located on a rebound path of the tail of the toggle spring. The transmission shaft has a cross section of an isosceles triangle. Also included is a control circuit including a motor control circuit, a feedback signal circuit, and a control signal circuit.

The motor control circuit comprises a diode D9, a diode D10, a triode G2 and a triode G3. The input end of the motor is connected to the positive pole of the power supply, the output end of the motor is connected to the input end of the diode D9, and the output end of the diode D9 and the input end of the triode G2. Connected, the output end of the transistor G2 is connected to the negative pole of the power supply, the output end of the motor is also connected to the input end of the diode D10, the output end of the diode D10 is connected to the input end of the transistor G3, and the output end of the triode G3 is connected to the negative pole of the power supply. .

The feedback signal circuit includes a feedback signal input terminal capable of sensing whether the output of the external circuit breaker of the electric energy meter has electricity, a full bridge D5-8, a photocoupler OC3, and a unidirectional thyristor SCR, and the feedback signal input end and the full bridge The input end of D5-8 is connected, the output end of the full bridge D5-8, the optocoupler OC3 and the negative pole of the power supply are connected in series, and the output end of the full bridge D5-8 is also connected in series with the control end of the unidirectional thyristor SCR; control signal The circuit comprises a signal input end, a full bridge D1-4, a photocoupler OC1 and a photocoupler OC2, a signal input end, a full bridge D1-4, a photocoupler OC1 and a negative pole of the power supply are connected in series, and the signal input end is also coupled with the optocoupler. The OC2 and the negative pole of the power supply are connected in series.

The feedback signal circuit further includes a resistor R7 connected in series between the feedback signal input terminal and the input terminal of the full bridge D5-8. The control signal circuit further includes a capacitor C, a resistor R1 and a resistor R2. The two ends of the capacitor C are respectively connected to the full bridge D1-4 and the negative pole of the power source, and the resistor R2 is connected in series between the full bridge D1-4 and the photocoupler OC1, and the resistor R2 Both ends are connected in parallel to both ends of the capacitor C.

By adopting the above technical solution, wherein the motor drives the mushroom driving wheel to rotate the driving teeth on the transmission column to drive the plane vertical tooth driven wheel to rotate until the transmission tooth is separated from the planar vertical tooth driven wheel, and the miniature circuit breaker realizes closing. When the electric circuit breaker external circuit breaker is closed, the motor and the umbrella driving wheel are powered off, the structure is simple, and the production cost is reduced; if the small circuit breaker is opened, only the driving motor continues to rotate, and then the dialing is performed. The moving spring will move the trip pin on the miniature circuit breaker until the tail of the toggle spring resists the trip pin with its own elasticity. At this time, when the manual circuit breaker is manually closed, the contact of the miniature circuit breaker is always When it is in the open state, it can meet the requirement that the miniature circuit breaker can not be closed when the small circuit breaker is in the manual state.

KNB1-63 Mini Circuit breakers, also named as the air switch which have a short for arc extinguishing device. It is a switch role, and also is a automatic protection of low-voltage electrical distribution. Its role is equivalent to the combination of switch. Fuse. thermal relay and other electrical components. It mainly used for short circuit and overload protection. Generally, According to the poles, mini Circuit breaker can be divided into 1P , 1P+N , 2P, 3P and 4P.

KNB1-63 Miniature Circuit Breaker, Electronics Miniature Circuits Breaker, Automatic Miniature Circuit Breaker, Mini Circuit Breaker
Wecome Group Imp. & Exp. Co., Ltd. http://www.korlen-electric.com