Chemical Mechanical diaphragm metering pump

Mechanical diaphragm metering pump

working principle
The motor drives the worm gear pair, and the rotary motion of the motor is converted into the reciprocating motion of the sliding rod through the eccentric mechanism, and the mechanical diaphragm is directly subjected to periodic deformation by the reciprocating sliding rod to realize the suction and discharge of the medium.
Characteristics
◆Excellent double diaphragm design, the laminated multi-layer diaphragm structure makes the diaphragm evenly stressed and durable;
◆ Double diaphragm made of PTFE has excellent corrosion resistance and impermeability.
◆ Diaphragm condition monitoring system can output signals when the diaphragm is broken, and can work until the diaphragm is replaced or directly stopped.Stop pump operation, no pollution to the metering medium;

◆Precise eccentric structure design, with cam and spring eccentric mechanism and integral sleeve adjustable eccentric transmission mechanism;
◆The static seal of the hydraulic end diaphragm replaces the dynamic seal of the plunger, so it can achieve no leakage of the conveying medium;
◆The slide bar directly drives the diaphragm movement instead of using hydraulic pressure to drive the diaphragm to make the reciprocating cycle motion, so the mechanical diaphragm pump
◆The patented mechanical diaphragm design ensures stable flow output.
◆ Whether it is stop or running, the smooth and stable output flow can be adjusted steplessly by fine-tuning the knob.
◆ There is no safety relief device. It is recommended to install a safety valve on the outlet line of the pump.

The output flow is depend on the stroke speed, pump head size and stroke length of the drive end. The stroke length can be adjusted by the control hand wheel in both running and halted state of the pump. The drive end is worked based on the perational principle of eccentric mechanism. The motor drive the principal axis through worm and worm wheel, the eccentric mechanism associated with the spindle convert the rotary motion of the worm wheel into reciprocating motion of the slide bar. When the stroke is "0", the axes of the spindle align with the axes of the eccentric gear and plunger piston stops reciprocating movement. When the stroke is within 0~100%, there is eccentricity between the eccentric mechanism and axes of the spindle, which will result in linear movement of the plunger piston.

When the slide bar pulls the diaphragm to move backward, the volume between the diaphragm and the front pump head increases and resulting negative pressure opens the check valve on the suction pipe. The medium in the inlet pipeline enters into the cavity of the pump head. At the end of the suction stroke, the diaphragm movement stopped instantly, pressure within the pump head and the pressure in the inlet pipe are in balance and the inlet check valve restores its original state.

During discharge stroke, the diaphragm connecting with slide bar moves forward. The pressure in the pump head increases immediately. When the pressure of the pump head exceeds the outlet pressure, the check valve opens and the medium within the pump head enters into discharge pipeline. At the end of the discharge stroke, the diaphragm stops movement again, the pressure within the pump head and outlet pressure are in balance and the outlet check valve restores to its original state.