A flow linear regulating valve controlled by plc using inlet flow parameters

Abstract

The invention aims at providing a flow linear regulating valve controlled by a PLC and using inlet incoming flow parameters. The flow linear regulating valve comprises a valve body, a motor, a worm and a gate plate. The pipe flow shape of the valve body is square, the valve body is mounted in a pipe through a flange, the PLC is installed on the pipe and is connected to the motor, the motor is connected to the motor worm, a gate plate sliding slot is formed in the valve body, one side of a gate plate is located in the gate plate sliding slot, and the other side of the gate plate is provided with a gate plate tooth line; and the worm includes a worm gear, a polished segment and a threaded segment, the polished segment is located between the worm gear and the threaded segment, the worm gear is engaged with the motor worm, and the threaded segment is engaged with the gate plate tooth line. According to the flow linear regulating valve, the square gate plate is placed into the gate plate sliding slot, the stress area is larger, the design of threads on the side of the gate plate enables the gate plate to be stably arranged at any height, and the gate plate is more stable when bearing airflow exciting force. By means of the design of the low-rotating-speed motor, the worm and a worm wheel, the worm rotating speed is lower, and the PLC can conveniently control opening and closing of the gate plate through the power supply time.

Description

technical field [0001] The present invention relates to a valve, specifically a flow regulating valve. Background technique [0002] In the process of pressure or flow measurement experiments, a large number of valves need to be used to control the flow. Common valves include ball valves, butterfly valves, and globe valves. The principle of its flow control is to control the opening and closing angle of the valve so that the area term in the continuity equation affects the flow. In the actual operation process, it is often necessary to precisely adjust the flow rate, which needs to clarify the change rule of the flow rate with the opening and closing angle of the valve. However, the structural adjustment methods of the existing valves are not linear: the through hole in the valve core of the ball valve changes with the opening and closing angle, and its sealing effect is good, but because the valve core is opened and closed in a circumferential rotation, the through hole co...

AI Technical Summary

Problems solved by technology

However, the structural adjustment methods of the existing valves are not linear: the through hole in the valve core of the ball valve changes with the opening and closing angle, and its sealing effect is better, but because the valve core is opened and closed in a circumferential rotation, the through hole corresponds to the pipeline. The change of the area is non-linear; the butterfly plate in the butterfly valve is opened and closed through the rotation of the valve stem and the transmission mechanism with the hand wheel, and its poor sealing performance is not suitable for fully enclosed pipelines; the stop valve moves up and down through the plug-type disc to close the valve. The arranged pipeline has a small cut-off formation and can quickly close the pipeline, but it also results in poor flow regulation characteristics, which is inconvenient for precise flow control; the gate valve adopts a circular gate, and the opening and closing is controlled by the up and down movement of the gate rod. , the relationship between the up and down movement of the ram in the circular pipe is nonlinear and the relationship between its area and the up and down movement distance

[0003] In the gate valve, only the gate rod is used to restrict the movement of the flow direction, and the partial opening of the gate in the circular pipeline will cause a vortex to form behind the gate to generate a large excitation force. Long-term excitation will loosen the fastening part of the gate rod and affect the seal. effect, reducing the service life of the valve

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