A method for detecting the number of air changes of an independent ventilated cage box

Abstract

The invention discloses a method for detecting the ventilation frequency of an independent ventilated cage box. The steps are as follows: firstly, the volume of the independent ventilated cage box is measured as 0 , connect the small-diameter end of the enclosure structure of the hollow conical structure with the air inlet inside the independent ventilation cage box, wherein the diameter of the small-diameter end is the same as the diameter of the air inlet, and the inside of the small-diameter end is glued with a rubber pad, and the diameter of the large-diameter end is larger than the small diameter 2 times of the end diameter, the height of the enclosure structure is 3.33 times of the diameter of the small diameter end; then measure the average wind speed v at the large diameter end of the enclosure structure, the area S and the inlet air temperature t of the large diameter end, and finally According to the calculation formula, the number of air changes of the independent ventilation cage box is obtained. The beneficial effect of the present invention is: the enclosure structure is added, which can avoid the wind speed being not concentrated due to the too small diameter of the tuyere of the independent ventilation cage box or the diffuser at the tuyere. , The problem of inaccurate measurement can more accurately and truly reflect the number of air changes of each independent ventilation cage box.

Description

technical field [0001] The invention belongs to the field of independent ventilation cage box detection, in particular to a detection method for the ventilation times of an independent ventilation cage box. Background technique [0002] Independent Ventilation Cage (IVC) refers to a closed independent unit (cage box or cage), which is fed with clean air and discharged in a centralized manner. It can operate and raise SPF experimental animals in an ultra-clean workbench. The working principle of the equipment is to use the airtight purification and ventilation technology of the isolator to reduce each rearing unit to a minimum degree, and connect it into an assembly with the intake and exhaust pipes, so that the unit is completely isolated from the unit, avoiding the maximum It avoids cross-contamination in feeding and improves the utilization efficiency of clean air. At the same time, using the aseptic experiment operation technology and method in the ultra-clean workbench, ...

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Problems solved by technology

However, this measurement method is not suitable for detecting the number of ventilation in IVC. There are 30-60 independent ventilation cages in a whole set of IVC, and the measurement results of the number of ventilation and static pressure difference of each independent ventilation cage The fluctuation is large, and the accurate data of each independent ventilated cage cannot be reflected. However, when the above method is used to measure each independent ventilated cage, the diameter of the tuyere is too small, about 30mm, and the tuyere of each independent ventilated cage has Diffusers will cause uneven wind speed and have a great influence on the wind speed obtained by direct measurement

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