Novel smart gas meter motor valve

Abstract

The invention discloses a novel smart gas meter motor valve which is composed of a valve body, a motor (2), a speed changing apparatus (3), a screw drive mechanism (15) and a valve stem (5). Executing mechanisms, like the motor (2), the speed changing apparatus (3), an anti-stalling mechanism (17), the screw drive mechanism (15) and the valve body (5) which are installed on the inner wall of the valve body achieve no stalling upon the opening and closing of the valve, and the valve can be closed with small torque through cooperation of an energy storing apparatus (14) and the start of the motor (2), so that the energy consumption of the motor valve is reduced, and the service life of the motor valve is prolonged. The novel smart gas meter motor valve of the invention is simple in structure and convenient in manufacturing, and can be widely applied to all types of gas meters.

Description

technical field [0001] The invention relates to a motor valve for a gas meter, in particular to a novel intelligent gas meter motor valve. Background technique [0002] At present, the motor valves used in smart gas meters generally have three structures. One is to use the rotating track to drive the movement of the actuator to realize the switch of the valve; such as the valve disclosed in the patent No. CN202270920U scheme for smart gas meters to control special motor valves The core assembly, the motor valve rotates forward and reverse through the motor, the spiral orbit circle is fixed on the driven gear, the top edge of the spiral orbit circle annular side wall presses on the limit shaft, and the driven gear drives the spiral orbit circle to circle When the valve stem rotates, the top edge of the spiral orbit circle will move the limit axis upward (or downward) to realize the opening and closing of the valve. However, this structure has no unloading device, which will c...

AI Technical Summary

Problems solved by technology

However, this kind of structure can not restore the swing plate smoothly in the later stage of closing the valve. After closing the valve, there is no self-locking device to keep the closed state. The complete gear meshes very well; in addition, the processing of the incomplete gear assembly is complicated and the cost is relatively high; the gas meter special motor valve disclosed in the Chinese invention patent of the similar patent CN101907194A adopts a ratchet The double gear and its accessories are used to realize the self-locking and unlocking of the switch valve, but when the valve is closed, the ratchet double gear is forced to push the splint to rotate clockwise around the transmission shaft of the input gear under the action of the lock block. At this time, the ratchet The double-toothed gear is separated from the incomplete gear, and the valve is closed. At the same time, on the splint, the lock block also rotates counterclockwise around its own axis. When the lock block is disengaged from the ratchet gear, unloading is realized, so that the valve is closed without blocking.

After the motor stops, the lock block is reset under the reset force of the reset spring, but it cannot guarantee the reset of the ratchet double gear, nor can it guarantee the correct meshing with the incomplete gear after reset.

[0004] The third is to drive the roller type overrunning clutch to rotate through the forward and reverse rotation of the motor, so as to realize the purpose of anti-blocking and fast closing of the valve; such as a new type of intelligent gas meter motor valve disclosed in the Chinese invention patent with the patent number CN104595497A, An overrunning clutch is added to the transmission device. The overrunning clutch is composed of an inner ring, a roller, an outer ring and a spring. Coaxial with the overrunning clutch, a coil spring assembly preloaded in a counterclockwise direction is installed. Using the clutch overrunning characteristics of the overrunning clutch, When the motor rotates counterclockwise, the inner ring and the roller are wedged tightly with the outer ring under the action of the spring, and under the double action of the motor and the coil spring assembly, the valve stem that engages with the outer ring is driven to drive the valve cap to move, realizing opening and closing. The valve moves, and the energy storage device stores energy at the same time; when the bonnet reaches the designated position, the rack and the outer ring slip to prevent blocking; when the motor is clockwise, the inner ring and the outer ring are separated and enter the overrunning state, and the bonnet Under the action of the energy storage device, the valve can be closed quickly; however, the rack and pinion transmission in this scheme occupies a large volume, and the overrunning clutch is relatively complicated, and there is no existing product with a suitable size available, because its design and processing are relatively complex. Complicated, making it difficult for productization

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