Diaphragm-type pneumatic proportional pressure reducing valve of ball screw driven by servo motor directly

Abstract

The invention provides a diaphragm-type pneumatic proportional pressure reducing valve of a ball screw driven by a servo motor directly. An output shaft of the servo motor is in clearance fit with a sun gear of a planetary reducer, a planet gear of the planetary reducer is connected with a transmission block, the lower end of the transmission block is connected with the ball screw, the ball screw is matched with a lead screw nut, the lower portion of the lead screw nut is connected with a pressure adjusting spring, the lower end of the pressure adjusting spring is connected onto a spring end cover, a diaphragm is fixed between an upper valve body and a lower valve body in a compressed mode and located on the lower portion of the spring end cover, an overflow valve is installed in the middle of the spring end cover, a valve rod penetrates through the diaphragm to butt against a valve port of the overflow valve, the lower end of the valve rod is connected with a valve element, an air inlet and an air outlet are formed in the two sides of the lower valve body, an air feedback hole is formed in the lower valve body, the outer portion of the valve element is connected with a reset spring, and the valve element, the reset spring and a lower end cover are connected in a sealed mode. The servo motor directly drives the lead screw nut to compress the springs so as to achieve linear motion of the valve element, the structure is compact, transmission is stable, and dynamic control can be achieved.

Description

technical field [0001] The invention belongs to the technical field of pneumatic proportional pressure reducing valves, in particular to a diaphragm type pneumatic proportional pressure reducing valve directly driven by a servo motor. Background technique [0002] The pressure reducing valve is a pressure control valve that reduces the inlet pressure to a certain outlet pressure by changing the throttling area to cause a pressure drop when the fluid passes through, and relies on the energy of the medium itself to keep the outlet pressure automatically stable. According to the control pressure, traditional pressure reducing valves can be divided into three types: fixed value, constant ratio and fixed difference. According to the structure and working principle, it can be divided into two types: direct acting pressure reducing and overflow valve and pilot pressure reducing valve. They are all mechanical manual pressure regulating valves, and the adjustment accuracy is not high...

AI Technical Summary

Problems solved by technology

However, the traditional electrical proportional pressure valves currently used in industrial practice often use specially designed DC proportional electromagnets to adjust the valve output pressure. This traditional proportional valve has high cost, poor dynamic and static performance, and has a certain degree of insensitivity. Zone and hysteresis, and poor linearity, poor resistance to oil and water pollution in compressed air, and low resistance to vibration and shock in machine tool use

Images