Metering device of automatic analysis meter

Abstract

The invention relates to a metering device of an automatic analysis meter, which belongs to the technical field of automatic analysis metering. The device comprises a liquid flow driver, a first control valve and a second control valve, wherein liquid flow storage and transportation passages are connected between the two control valves, the number of respective paths of the two control valves is greater than or equal to the number of the liquid flow storage and transportation passages, ports at one side of the first control valve paths are externally connected with test specimens or devices through pipelines, ports at the other side of the first control valve paths are communicated with ports at one side of the liquid flow storage and transportation passages through first public passages,ports at the other side of the liquid flow storage and transportation passages are respectively and correspondingly connected with ports at one side of the second control valve paths, ports at the other side of the second control valve paths are connected with the liquid flow driver, and the volume of the liquid flow storage and transportation passages and the fist public passages is a fixed value matched with the specimen metering volume. Because the volume of the liquid flow storage and transportation passages and the fist public passages can be precisely processed into various fixed valuesaccording to the metering volume of various test specimens, the device of the invention can complete the precise, stable and efficient metering on various test specimens.

Description

technical field [0001] The invention relates to a device for metering reagents in an automatic analyzer, belonging to the technical field of automatic analysis and metering. Background technique [0002] In the field of environmental technology such as automatic monitoring of water quality, automatic analyzers are used, and automatic analyzers are generally equipped with devices for measuring collected liquid samples (including reagents and sample liquids to be tested). [0003] In existing automatic analyzers, liquid flow drivers such as syringes, peristaltic pumps, and metering pumps are often used for measurement of general quantitative samples. This metering method is inflexible, not suitable for accurate metering of micro-sample or micro-sample with large ratio, and has the defect of unstable metering for long-term use. [0004] In order to improve the measurement accuracy, the inventor has previously applied for the Chinese patent "Automatic Chemical Analyzer" with th...

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Problems solved by technology

But still there is following defect in this special metering device: 1, though can accurately meter trace sample by sampling pipe, also need to remove the mixed solution of metering sample by photoelectric induction metering device at last, and existing photoelectric induction metering mode exists: ( 1) When encountering a dirty liquid sample, the dirt is easy to adhere to the wall of the metering tube and cause the photoelectric sensor to misdetect; (2) The liquid sample is sucked into the metering tube by the negative pressure of the liquid flow drive device such as a peristaltic pump When there is air, it will cause the liquid level to be unstable, which will affect the measurement accuracy. If the speed of the peristaltic pump is reduced when the liquid level is close to the photoelectric sensor, the liquid level will slowly move to the position of the photoelectric sensor. Although this can improve the measurement accuracy, However, it is bound to greatly lengthen the time for reagent measurement, thereby reducing the work efficiency of the entire automatic analyzer.

2. It is helpless for the measurement of different large proportions and trace amounts of three or more samples

[0005] In summary, the metering device in the existing automatic analyzer can only measure a single quantitative (general quantitative or trace), single type and single proportioning sample, and cannot realize the measurement of various (type, quantitative and proportioning) samples. Measurement; even for the measurement of a single sample, there are defects of low precision, poor stability, and low efficiency; and it is impossible to measure a variety of large-scale micro-sample

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