Waste liquid treatment apparatus, method and sample analyzer

A waste liquid treatment method for a sample analyzer, wherein the sample analyzer comprises a sample conveying system, a reagent compartment, a sample injection system, a reaction system, a cleaning system, and a waste liquid treatment apparatus;

• wherein the sample conveying system is used for providing a sample to be tested, the reagent compartment is used for providing a reagent for use in a test, the sample injection system is used for collecting the sample to be tested and the reagent and injecting the collected sample and reagent into a reaction cell of the reaction system, the cleaning system is used for cleaning the sample injection system, and the waste liquid treatment apparatus comprising a plurality of waste liquid pipes, at least two waste liquid chambers and a pressure supply device, wherein each waste liquid chamber is in communication with a discharge port of at least one waste liquid source selected from the reagent compartment, the reaction system and the cleaning system via at least one of the waste liquid pipes, so as to treat a waste liquid produced by the at least one waste liquid source in communication with the waste liquid chamber,
• wherein the waste liquid treatment method comprises:
• setting preset air pressure timings corresponding to the at least two waste liquid chambers respectively, wherein each preset air pressure timing comprises a negative pressure period, and the negative pressure period corresponding to each waste liquid chamber corresponds to a waste discharge timing of the waste liquid source connected to the waste liquid chamber via a waste liquid pipe;
• and
• controlling the pressure supply device to supply air pressure to each waste liquid chamber according to the preset air pressure timing corresponding to the waste liquid chamber, wherein the preset air pressure timings corresponding to the at least two waste liquid chambers are configured so that at least one waste liquid chamber in the at least two waste liquid chambers corresponds to the negative pressure period at any time during collecting and discharging waste liquid, so that an inside of at least one waste liquid chamber is in a negative pressure state at any time during collecting and discharging waste liquid to collect the waste liquid.