Liquid small flow standard device for hemodialysis machine calibrator

Abstract

The invention discloses a small liquid flow standard device special for a hemodialysis machine calibrator. The small liquid flow standard device is characterized in that a servo motor is connected with a ball screw through a speed reducer and a plum coupling, the two ends of the ball screw are fixed to a base, linear guiding rails are installed on the two sides of the ball screw, a connecting block is installed on guiding rail sliding blocks, two guiding rods penetrate through flange linear bearings on the connecting block in parallel, the end of a piston rod is fixed to the lateral face of the connecting block, a grating ruler is installed on one side of one of the guiding rails, a water outlet of a piston cylinder is connected with a buffering box, a pressure sensor and a temperature sensor are installed on the front lateral face and the rear lateral face of the buffering box respectively, the two sides of the buffering box are connected with electromagnetic valves respectively, a water inlet of one of the electromagnetic valves is connected with an inlet water tank, and a water outlet of the other one of the electromagnetic valves is connected with a detected flow meter. According to the small liquid flow standard device, the size of the piston cylinder serves as a metering standard, the displacement, the speed and the movement time of a piston are fed back to a control system through the grating ruler, and a closed-loop measuring system is achieved.

Description

technical field [0001] The invention relates to a small flow standard device, in particular to a liquid small flow standard device specially used for a calibrator of a hemodialysis machine. Background technique [0002] Flow measurement is widely used in various fields of industrial and agricultural production, national defense construction, scientific research, foreign trade and daily life. In life, most of what we can touch or understand is the measurement of large flow. However, with the development of industries such as bioengineering, fine chemicals and semiconductor manufacturing, the demand for small flow has gradually become prominent. Therefore, micro-flow metering has become one of the urgently needed technologies in the field of flow metering. [0003] With the advancement of medical engineering technology, the accuracy requirements of medical instruments are also getting higher and higher. Flow metering is increasingly used in medical and pharmaceutical enginee...

AI Technical Summary

Problems solved by technology

Traditional flow standard devices cannot meet the requirements of hemodialysis purification calibrator in terms of range, measurement accuracy, stability and high cost.

In addition, there is no standard device for micro flow rate suitable for hemodialysis purification calibrator designed according to the national flow meter verification regulations.

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