A liquid suction device

Abstract

The invention discloses a liquid sucking and discharging device. The liquid sucking and discharging device comprises at least one liquid sucking and discharging assembly. Each liquid sucking and discharging assembly comprises a pump body, a pump cavity, a rubber sealing pad, a driving mechanism and a sucking head ejection rod, wherein the pump cavity is connected to the lower end of the pump body and is provided with a longitudinally through cavity, the rubber sealing pad is arranged between the pump body and the pump cavity, a compression spring abuts against the lower surface of the rubber sealing pad, the driving mechanism is arranged at the upper end of the pump body and is provided with a telescopic rod capable of controlling the telescopic amount, the telescopic rod can abut against the rubber sealing pad in a retracted mode, the sucking head ejection rod is provided with an airflow passage, the upper end of the sucking head ejection rod is connected with the lower end of the pump cavity, the airflow passage is communicated with the cavity, and the lower end of the sucking head ejection rod is connected with a sucking head. The telescopic rod is matched with the compression spring, so that the volume of the pump cavity is changed and the function of liquid sucking and discharging is achieved. Besides, zero-position control of the pump cavity can be achieved, and the phenomenon of blockage caused by operating control faults is avoided. The liquid sucking and discharging device has the advantages of being simple in structure, low in cost, high in liquid distribution accuracy, and convenient to maintain and operate.

Description

technical field [0001] The invention relates to a medical device and laboratory equipment, in particular to a liquid suction and discharge device used in biomedicine, laboratories, etc. for distributing, suctioning and discharging trace amounts of liquid. Background technique [0002] At present, in many analytical and experimental instruments, the processing of trace liquids is usually involved, including operations such as extraction, sample addition, and liquid preparation. In the above operations, most of them use a liquid circuit system composed of thin tubes, sampling needles, valves, plunger pumps or diaphragm pumps, and peristaltic pumps. However, the structure of the existing liquid circuit system is relatively complex, which affects the accuracy of liquid distribution, which in turn interferes with the accuracy of the experiment to varying degrees. Most of the similar semi-automatic or fully automatic instruments at home and abroad use the above-mentioned hydrauli...

AI Technical Summary

Problems solved by technology

However, the structure of the existing liquid circuit system is relatively complex, which affects the accuracy of liquid distribution, and then interferes with the accuracy of the experiment to varying degrees.

Most of the similar semi-automatic or fully automatic instruments at home and abroad use the above-mentioned liquid circuit system and configure corresponding software and drivers, which causes defects such as high cost, complicated structure, and inconvenient maintenance and operation.

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