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What is negative pressure weighing hoods mainly used for?
What is negative pressure weighing hoods mainly used for?In the pharmaceutical industry, weighing eggs is used to carry out small batch drug weighing and dispensing special purification equipment, mainly including negative pressure weighing and activated carbon weighing eggs two kinds. Negative pressure weighing eggs is mainly used for pharmaceuticals, microbiological research scientific experiments, and other places dedicated to local purification equipment, An activated carbon weighing set is mainly used for water needle workshop activated carbon weighing special local purification equipment.Weighing can provide a vertical unidirectional airflow, part of the clean air circulation in the working area, and part of the discharge to the nearby areas, so that the working area produces negative pressure, to prevent cross-contamination, weighing generally uses negative pressure design, can effectively control the dust spillage, and can be used to prevent the dust spillage. Weighing is generally designed with negative pressure, which can effectively control dust spillage and uplift, prevent dust inhalation hazards to human beings, and protect the environment and the safety of personnel in the work area. Generally speaking, the ventilation and filtration system of the biopharmaceutical enterprise can meet the requirements of air supply, laminar flow device, transferring descent, weighing device return air outlet, etc. Our negative-pressure weighing device adopts the form of vertical unidirectional flow, and the return air should be pre-filtered through the primary filter first, to dispose of the large dust particles in the airflow. After pre-treatment of the air, and then through the intermediate filter for secondary filtration, it plays a role in fully protecting the high-efficiency filter. Under the pressure of centrifugal fan, through the high-efficiency filter, so that it meets the clean requirements, clean airflow is sent to the air supply box, 90% of which passes through the even-flow air supply mesh plate, forming a uniform vertical airflow, and 10% is discharged from the equipment through the airflow regulating plate. All the airflow is processed by a high-efficiency filter, so the air supply and exhaust are free of residual dust, avoiding secondary pollution. Due to the formation of a stable unidirectional flow in the working area, the dust emitted in this area will be collected by the primary and intermediate filters under the influence of the unidirectional airflow and with the airflow. Equipment with 10% of the exhaust air, thus forming a negative pressure relative to the external environment, to a certain extent, to ensure that the dust in the area will not spread to the outdoors, plays a role in protecting the external environment. A weighing room is a kind of local purification equipment used in pharmaceutical, microbiological, and scientific experiments, etc. It is a kind of vertical unidirectional airflow. Part of the clean air is circulated in the working area and part is discharged to the neighboring area, which generates negative pressure in the working area, prevents cross-contamination, and is used to ensure a high cleanliness environment in the working area. Dust and reagent weighing and dispensing in the equipment can control dust and reagent spillage and uplift, prevent dust and reagent inhalation hazards to the human body, and also avoid cross contamination of dust and reagent to protect the external environment and the safety of indoor personnel. |
