Method for detecting ventilation frequency of independent ventilation cage box

Abstract

The invention discloses a method for detecting the ventilation frequency of an independent ventilation cage box, and the method comprises the steps: firstly, measuring the volume V0 of the independentventilation cage box, enabling the small-diameter end of an enclosure structure of a hollow circular-truncated-cone-shaped structure to be communicated with an air inlet in the inner side of the independent ventilation cage box, and enabling the diameter of the small-diameter end to be the same as that of the air inlet; adhering a rubber pad to the inner side of the small-diameter end, wherein the diameter of the large-diameter end is twice larger than that of the small-diameter end, and the height of the enclosure structure is 3.33 times larger than that of the small-diameter end; and then measuring the average wind speed v at the large-diameter end of the enclosure structure, the area S of the large-diameter end of the enclosure structure and the air inlet temperature t, and finally obtaining the ventilation frequency of the independent ventilation cage box according to a calculation formula. The problems that the wind speed is not concentrated and measurement is inaccurate due to the fact that the diameter of the air opening of each independent ventilation cage box is too small or the air opening is provided with an air diffuser can be solved, and the ventilation frequency of each independent ventilation cage box can be reflected more accurately and truly.

Description

technical field [0001] The invention belongs to the field of detection of independent ventilation cages, and in particular relates to a detection method for the frequency of ventilation of independent ventilation cages. Background technique [0002] Independently ventilated cage (IVC) refers to the feeding and experimentation of SPF experimental animals that can be operated and raised in an ultra-clean workbench, in which clean air is fed in and exhaust gas is discharged in a closed independent unit (cage box or cage). The working principle of the equipment is to use the airtight purification and ventilation technology of the isolator to reduce each breeding unit to the minimum, and use the air inlet and exhaust pipes to connect them into an assembly, so that the units are completely isolated from each other, and the maximum avoidance Cross-contamination during breeding is improved, and the utilization efficiency of clean air is improved. At the same time, the aseptic experi...

AI Technical Summary

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

Images