Electromotor driven metering pump

Abstract

The invention relates to a metering pump which is provided with a rotation driving motor and a swing piston; wherein, the rotation motion of the driving motor is converted into the swing of a connecting rod by a transmission device, thus leading the displacement device driven thereout to carry out a linear swing with the continuous rotation of the driving motor; therefore, the medium to be measured is transmitted in a metering head (12); the metering head is arranged along the longitudinal axis line of a connecting rod (19) and is alternatively matched with an outlet valve and an inlet valve so as to generate a pumping stroke (pressure stroke) and a filling stroke. In the metering pump, a reference element (35) is relevant to the connecting rod; the position of the connecting rod is detected by a position sensor; wherein, the position sensor provides a practical signal (x1) which forms a fixed relation with the position of the reference element, thus forming a fixed relation with the position of the displacement device; furthermore, the signal also provides an information which is corresponding to the motion of the displacement device, therefore, the electronic control system of the metering pump can respond to the metering circuit and the operation conditions of the pump.

Description

technical field [0001] The invention relates to an electric motor driven metering pump according to the preamble of claim 1 . Background technique [0002] Electric motor driven metering pumps of this type are known and accessories are available to suit various needs. They work on a volume basis, where metering takes place by conveying a closed volume through a displacement device. In this way, the metered volume per stroke corresponds to the volume difference according to the movement of the displacement device. [0003] In general, such a motor-driven metering pump converts the continuous rotational motion of the drive motor into linear oscillating motion of the displacement device through a transmission. The rotational speed and torque of the electric motor is reduced in the transmission and matched to the speed and power required by the displacement device. The output shaft of the transmission drives the means for converting the rotary motion into a lateral, ie offset...

AI Technical Summary

Problems solved by technology

In this way, motor-driven metering pumps usually cannot be adjusted according to the required accuracy within a wide operating pressure range; in addition, errors caused by calibration will become more serious in subsequent further calculations

However, said calibration measurements, which must be performed in use under real operating conditions, are a very difficult step, especially when aggressive chemicals are used

[0012]Existing commonly used motor-driven metering pumps are efficient and have good metering performance for many processes, but their hydraulic lack of performance

Examples that may be mentioned are the relatively strong dependence of the measured quantity on the operating pressure of the metering circuit and disadvantages such as flow noise or pressure drop due to the high instantaneous flow velocity of the metering medium

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