Creativity knows no bounds, and inventions abound in metering. Today, we'd like to introduce a national invention patent—a zeroable electricity meter for motors . This patent was applied for by Nan'an Yisheng Technology Co., Ltd., and was granted authorization on November 6, 2018.
Content Description
This invention belongs to the field of electricity meter technology, specifically relating to a zeroable electricity meter for motors.
Background of the Invention
To achieve an energy meter counter where the counting wheel can return to zero without affecting the meter's accuracy, an energy meter counter with a zero-return counting wheel is provided. This counter includes a permanent magnet stepper motor, a counter support, and a counter component consisting of a counting wheel, a carry wheel, and a reduction gear. Two permanent magnet rotors are fixed at intervals on one shaft of the stepper motor, and two sets of stators and coils corresponding to the two permanent magnet rotors are arranged on the frame. When the two corresponding stators and rotors operate, their rotation directions are opposite, used for counting and zeroing respectively. The projection lines of the same-direction magnetic poles of the two permanent magnet rotors on a plane perpendicular to the motor shaft intersect but do not coincide, with the included angle between 10 and 180 degrees.
To facilitate maintenance and disassembly, one existing improvement is to modify the structure of fixing two permanent magnet rotors at intervals on one shaft of the stepper motor. The structure is modified so that the motor shaft of the stepper motor is connected to the shaft of the two permanent magnet rotors at intervals through a shaft connector. This allows the permanent magnet rotors to be driven to rotate by the stepper motor. However, the current shaft connector often has problems such as bending and stretching of the motor shaft or the rotating shaft due to the stress during the rotation of the shaft and the connection is not secure.
Summary of the Invention
The purpose of this invention is to provide a zeroable meter for motors, which avoids the defects in the prior art where the stress during the rotation of the shaft causes bending or stretching of the motor shaft or rotating shaft due to unreliable connection.
A plan view of the connection structure between the motor shaft and the rotating shaft of the motor of the present invention, which is sleeved with two permanent magnet rotors, under the condition of separation.
To overcome the shortcomings of the prior art, the present invention provides a solution for a zeroable electricity meter counter for motors, specifically as follows: A zeroable electricity meter counter for motors includes a permanent magnet stepper motor, a counter bracket, and a counter component consisting of a digit wheel, a carry wheel, and a reduction gear. The motor shaft of the stepper motor is connected to the rotating shaft of two permanent magnet rotors that are spaced apart by a connecting structure. Two sets of stators and coils corresponding to the two permanent magnet rotors are set on the frame. When the two corresponding stators and rotors work respectively, the rotors rotate in opposite directions, respectively for counting and zeroing. The projection lines of the same magnetic poles of the two permanent magnet rotors on a plane perpendicular to the motor shaft intersect but do not coincide, and the included angle formed by the intersection is in the range of 10-180 degrees.
The connection structure between the motor shaft of the motor and the shaft with two permanent magnet rotors is as follows: the right end of the motor shaft A1 is a first gradually expanding opening A10 that gradually expands from left to right; the left end of the shaft A2 with two permanent magnet rotors is a second gradually expanding opening A20 that gradually expands from right to left; a snap-fit ring A3 is provided on the inner surface of the first gradually expanding opening A10; and a snap-fit groove A4 is opened on the inner surface of the second gradually expanding opening A20 to snap-fit with the snap-fit ring A3.
The first sleeve A7 is circumferentially connected to the outer surface of the first flared opening A10. The horizontal projection of the first sleeve A10 is an annular contour formed by two concentric circles, namely an inner circle and an outer circle, with the inner circle located within the area enclosed by the outer contour of the horizontal projection of the first flared opening A10. The second sleeve A8 is circumferentially connected to the outer surface of the second flared opening A20. The horizontal projection of the second sleeve A8 is an annular contour formed by two concentric circles, namely an inner circle and an outer circle, with the inner circle located within the area enclosed by the outer contour of the horizontal projection of the first flared opening A10. The second inner circle of the part and the second outer circle located on the outside are formed, and the second inner circle is located in the area enclosed by the outer contour of the horizontal projection of the second flared opening A20; the first sleeve A7 and the second sleeve A8 are riveted together by rivets A9, and a first copper alloy ring A5 is attached to the outer surface of the first flared opening A10, and a second copper alloy ring A6 is attached to the outer surface of the second flared opening A20. The snap ring A3 is a snap ring with an elliptical rubber ring A11, and the snap groove A4 is a snap groove with an elliptical rubber ring.
Under the stress generated during the rotation of the shaft, the present invention ensures that the motor shaft or rotating shaft has very high strength due to the reliable connection, thus preventing bending and stretching.
