Today, I will introduce a national invention authorized patent-an external circuit breaker for electric energy meters. The patent was applied for by Wenzhou Shengpu Electric Co., Ltd., and the authorization was announced on March 15, 2017.
Content descriptionThe invention relates to the field of automatic control of low-voltage electrical appliances, in particular to an external circuit breaker of an electric energy meter.
Background of the inventionIn order to realize the intelligent control of the national power supply network, in February 2015, the State Grid Corporation of China announced a technical specification for an external circuit breaker for electric energy meters. When the circuit breaker is in use, the external circuit breaker of the electric energy meter must be in power when the miniature circuit breaker is in arrears. It is also required that the external circuit breaker of the electric energy meter must be in power when the miniature circuit breaker is closed. Out of the state, at present, there are no products and control schemes that fully comply with this specification at home and abroad.
Summary of the inventionIn view of the shortcomings of the prior art, the purpose of the present invention is to provide a small circuit breaker that cannot be closed when the external circuit breaker of the electric energy meter is opened and the external circuit breaker of the electric energy meter can be realized after closing. The external circuit breaker of the electric energy meter with power disconnection.
The technical scheme of the present invention is realized as follows: an electric energy meter external circuit breaker, which is characterized in that it includes an electric closing mechanism linked with the handles of several pole small circuit breakers and a trip mechanism linked with the electric closing mechanism, so The electric closing mechanism described includes a plane vertical tooth driven wheel, an umbrella-shaped driving wheel and a motor. The plane vertical toothed driven wheel is linked with the handles of a plurality of pole small circuit breakers through a transmission shaft. The umbrella-shaped driving wheel includes an umbrella-shaped driving wheel body. And a transmission column arranged on one side of the umbrella-shaped driving wheel body, the side of the transmission column is provided with transmission teeth, the transmission teeth mesh with the plane vertical tooth driven wheel, and the stroke of the transmission teeth is the same as the stroke of the handles of several pole miniature circuit breakers Equally, the motor is linked with the umbrella-shaped driving wheel body through the transmission bevel gear.
Preferably, the trip mechanism includes a movable groove arranged on the other side of the umbrella-shaped driving wheel body and a toggle spring arranged in the movable groove, the tail of the toggle spring is fixedly connected to the movable groove, and the toggle spring A movement margin is formed between the middle part and the movable groove, 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 movement path of the head of the toggle spring.
It also includes a control mechanism. The control mechanism includes a permanent magnet and a conductive elastic piece. The conductive elastic piece includes a contact piece with one end upturned. 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 block and positioning blocks distributed around the arc-shaped block, the head of the toggle spring is distributed along the inner surface of the arc-shaped block, and the toggle spring The head of the toggle spring is clamped on the arc stop, the middle of the toggle spring is in an arc shape, there is a gap between the middle of the toggle spring and the outer surface of the arc stop, and the tail of the toggle spring exceeds the edge of the umbrella-shaped driving wheel body Set up. A blocking column is arranged on the other side of the umbrella-shaped driving wheel body, and the blocking column is located on the rebound path of the tail of the toggle spring. The cross section of the transmission shaft is an isosceles triangle. It also includes a control circuit, which includes a motor control circuit, a feedback signal circuit, and a control signal circuit.
The motor control circuit includes a diode D9, a diode D10, a transistor G2, and a transistor G3. The input end of the motor is connected to the positive electrode of the power supply, and the output end of the motor is connected to the input end of the diode D9. The output end of the diode D9 is connected to the input end of the transistor G2. Connected, the output terminal of the transistor G2 is connected to the negative electrode of the power supply, the output terminal of the motor is also connected to the input terminal of the diode D10, the output terminal of the diode D10 is connected to the input terminal of the transistor G3, and the output terminal of the transistor G3 is connected to the negative electrode of the power supply .
The feedback signal circuit includes the feedback signal input terminal that can sense whether the output terminal of the external circuit breaker of the electric energy meter has electricity, the full bridge D5-8, the photocoupler OC3 and the one-way thyristor SCR, the feedback signal input terminal and the full bridge The input terminal of D5-8 is connected, the output terminal of the full bridge D5-8, the photocoupler OC3 and the negative electrode of the power supply are connected in series, and the output terminal of the full bridge D5-8 is also connected in series with the control terminal of the one-way thyristor SCR; control signal The circuit includes a signal input terminal, full bridge D1-4, photocoupler OC1, and photocoupler OC2. The signal input terminal, full bridge D1-4, photocoupler OC1 and the negative pole of the power supply are connected in series in sequence, and the signal input terminal is also connected to the photocoupler. OC2 and the negative pole of the power supply are connected in series.
The feedback signal circuit also includes a resistor R7, which is connected in series between the feedback signal input terminal and the input terminal of the full bridge D5-8. The control signal circuit also 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 electrode of the power supply. The resistor R2 is connected in series between the full bridge D1-4 and the photocoupler OC1, and the resistor R2 Both ends of is connected in parallel to both ends of the capacitor C.
By adopting the above technical solution, the motor drives the umbrella-shaped driving wheel to rotate and drives the transmission teeth on the transmission column to drive the plane vertical toothed driven wheel to rotate until the transmission teeth are separated from the plane vertical toothed driven wheel. At this time, the miniature circuit breaker is closed. It is realized that after the external circuit breaker of the electric energy meter is closed, the motor and the umbrella-shaped driving wheel realize the power separation, the structure is simple, and the production cost is reduced; if the small circuit breaker is opened, only the motor needs to be driven to continue to rotate. The movable spring will toggle the trip pin on the miniature circuit breaker until the tail of the toggle spring uses its own elasticity to resist the trip pin. At this time, when the miniature circuit breaker is manually closed, the contact of the miniature circuit breaker is always In the open state, it can meet the requirement that the miniature circuit breaker cannot be closed when the external circuit breaker of the electric energy meter is in the manual state during the use of the miniature circuit breaker.
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