Improved suction filtration device with automatic sampling function and suction filtration method

Abstract

The invention discloses an improved suction filtration device with an automatic sampling function. The suction filtration device comprises a vacuum pump, a filter cup, a filter head, a suction filtration bottle, a liquid inlet pipe, an exhaust pipe and an opened container containing liquid to be subjected to suction filtration; the suction filtration bottle, the filter head and the filter cup aredetachably and hermetically connected from bottom to top in sequence; the filter cup is provided with a liquid inlet, one end of the liquid inlet pipe is connected with the liquid inlet, and the otherend of the liquid inlet pipe is inserted into the opened container; a filter head exhaust port is formed in the side wall of the filter head; one end of the exhaust pipe is connected with the filterhead exhaust port, and the other end of the exhaust pipe is connected with an air inlet of the vacuum pump; a filter membrane is arranged between the filter head and the filter cup; a liquid collection device is arranged in the filter head and is in a funnel shape; an upper port of the liquid collection device is in contact with the filter membrane; a lower port of the liquid collection device isinserted into the suction filtration bottle. The invention further discloses a suction filtration method of the improved suction filtration device with the automatic sampling function. According to the improved suction filtration device and the suction filtration method, by automatic feeding of liquid into the filter cup and quantitative suction filtration of the required liquid, the experiment efficiency is improved, and meanwhile, external contamination and sample waste are avoided.

Description

technical field [0001] The invention relates to a suction filtration device and a suction filtration method, in particular to an improved suction filtration device and a suction filtration method capable of automatic sampling. Background technique [0002] At present, suction filtration devices are widely used in laboratories. Its main function is divided into two parts, one part is to enrich a small amount of substances in the solution, such as intercepting and enriching microorganisms in drinking water with a 0.22um filter membrane, so as to carry out the next microbial analysis; the other part is to intercept water samples When using some sensitive and precise instruments to measure liquid samples, it is often necessary to remove the impurities in the liquid by suction filtration to prevent damage to the instrument and reduce the service life of the instrument. The suction filtration device mainly includes four parts: a vacuum pump, a suction filter bottle, a filter cup ...

AI Technical Summary

Problems solved by technology

[0004] 1. The mouth of the filter bottle is frosted. If the bottle mouth is not wiped dry when connecting the filter bottle and the filter head, it will not be able to be opened due to negative pressure after the filter is completed, so that the filter bottle cannot be poured out in time. The liquid collected in the medium affects the performance of the experiment

[0005] 2. Since the suction filter bottles used today have no scale, when a certain volume of filtered liquid needs to be accurately used, it often leads to too much or too little liquid collected, which increases experimental operations and errors

[0006] 3. The connection between the filter head and the filter cup is a clamp. During the experimental operation, samples are often wasted due to unclamped or weakened clamps.

[0007] 4 The currently used suction filter bottle requires the operator to replenish the liquid into the filter cup regularly during suction filtration, so when the operator forgets to replenish it in time, on the one hand, the vacuum pump will always be in working condition, resulting in unnecessary energy loss. On the other hand, it will affect the experimental process and reduce the experimental efficiency

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