An Electric Valve with Double Transmission Mechanism

Abstract

The invention relates to an electric valve with a double transmission mechanism. It is characterized in that a driving gear is set above the valve stem of the electric valve, and the driving gear can drive the valve stem to move up and down or rotate, so that the electric valve can open or close the valve; the driving gear is meshed with a valve opening gear set and a valve closing gear The valve opening gear set and the valve closing gear set are independent of each other, respectively driving the driving gear to perform valve opening and closing; the valve opening gear set is driven by clutch mechanism 1, the valve closing gear set is driven by clutch mechanism 2, clutch mechanism 1 and clutch mechanism The second mechanism is driven by the power mechanism. The on-off valve of the present invention belongs to two different sets of transmission mechanisms, which solves the problem of too fast or too slow valve closing time; for large-diameter, medium-high pressure valves, the energy storage mechanism can also be used to close the valve at the initial stage. The valve is closed by means of the torsion force of the energy storage mechanism, and when the valve closes almost in place, the valve is closed by the valve closing gear train.

Description

technical field [0001] The invention relates to an electric valve with a double transmission mechanism. Background technique [0002] In the gas industry, it is mainly in the field of industrial smart gas meters, including membrane gas meters and flow meters, which are equipped with electric control valves. In most cases, the electric valves in this field are closed along the flow. The gas pressure requires a very small torque to close the valve, and the opening of the valve is to open the valve against the flow. When opening the valve, it needs to overcome the gas pressure to open the valve, so a larger torque is required to open the valve, which is reflected in the reduction ratio. The reduction ratio of the valve closing can be less than The valve opening deceleration ratio, so that the valve closing time is shorter than the valve opening time. There are two types of switch valves currently used, one is slow opening and slow closing, that is, the opening and closing time...

AI Technical Summary

Problems solved by technology

The electric valves currently used have two types of switching valves, one is slow opening and slow closing, that is, the opening and closing time of the valve is longer and equal, and the other is slow opening and fast closing, the valve is opened slowly but closed in an instant. Complete, these two methods are two extremes in terms of valve closing time, and both have certain disadvantages

The slow opening and slow closing valve takes a long time to close the valve, and generally takes a few minutes to close the valve. The control circuit should be equipped with a special battery or power supply for closing the valve. If the user’s gas volume is exhausted or an emergency occurs, the valve cannot be closed quickly.

For slow-opening and fast-closing valves, because the closing time is too short, the closing time is generally completed within 3 seconds, so that the meter stops working instantly, and the mechanical parts in the meter are easily damaged, resulting in the failure of normal metering

Images