Introduction and working principle of negative pressure weighing hood, description of Hujing negative pressure weighing hood

Weighing and packaging of dust and reagents in the equipment can control the spillage and rise of dust and reagents, prevent the inhalation hazards of dust and reagents to the human body, and also avoid cross-contamination of dust and reagents, and protect the safety of the external environment and indoor personnel
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The weighing operation area is protected by a thousand-level vertical laminar flow lSO 6 (NF, EN, ISO14644-1)
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Product features: 1.
The low-negative pressure air flow through the lower subsidence type flows in the operation area, creating a clean and sterile local environment to avoid cross-contamination between different medicines.
The inhalation hazard of the reagent to the human body, also avoid the cross-contamination of dust and reagents, and protect the safety of the external environment and indoor personnel Molecular flow uniform film significantly improves the uniformity of the air.
2.
Structural features: This equipment is assembled from the working area, the return air box, the fan box, the outlet box and the outer box
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The control panel is located on the front of the inner working area of ​​the equipment.
The control panel adopts a light-touch LED control panel, which can control the start and stop of the fan, adjust the working condition of the fan, and adjust the wind speed required in the working area (when the equipment is installed and used, the working condition needs to be adjusted by special personnel.
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There is a differential pressure gauge next to it, and the resistance of the test filter is inside the air supply box.
There is also an exhaust adjustment plate, which can adjust the exhaust air volume of the equipment within a reasonable range (after the equipment is installed, it is designed by professionals.
3.
Working principle: This equipment adopts the form of vertical unidirectional flow, and the return air must be pre-filtered through the primary filter to dispose of large particles of dust particles in the airflow
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The pretreated air is then filtered through a medium-efficiency filter to fully protect the high-efficiency filter
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Under the pressure provided by the centrifugal fan, it passes through the high-efficiency filter to make it meet the requirements of cleanliness
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The clean air flow is sent to the air supply box, 90% of which passes through the uniform air supply screen plate to form a uniform vertical air supply air flow, and 10% passes through the air volume adjustment plate and is discharged from the equipment
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All airflows are processed by high-efficiency filters, so there is no residual dust in the air supply and exhaust, which avoids secondary pollution
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Due to the formation of a stable one-way flow in the working area, the dust emitted in this area will be captured by the primary and medium-efficiency filters along with the air flow under the influence of the one-way air flow
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The equipment has a 10% exhaust air, thus forming a negative pressure relative to the external environment, which ensures that the dust in this area will not spread to the outside to a certain extent, and plays a role in protecting the external environment
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