一种气流均匀分布的负压称量罩
By employing a V-shaped plate and a porous air supply plate structure in the negative pressure weighing hood, combined with a filter, the problems of insufficient local negative pressure and dust accumulation caused by uneven airflow are solved, achieving uniform airflow distribution and improved weighing accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN PURUI PHARMACEUTICAL CO LTD
- Filing Date
- 2025-10-13
- Publication Date
- 2026-07-17
AI Technical Summary
The uneven airflow in the ventilation chamber of the existing negative pressure weighing hood may lead to insufficient negative pressure in some areas of the operating area, and the turbulent airflow may cause dust to be suspended or accumulated, affecting the weighing accuracy.
A negative pressure weighing hood with uniform airflow distribution is designed. It adopts a V-shaped plate and a porous air supply plate structure. The air passages and vents are arranged in a certain pattern. Combined with G4 grade and HEPA filters, it can achieve initial and secondary airflow uniformity and avoid eddy formation.
It achieves uniform airflow distribution, reduces the risk of dust suspension and accumulation, ensures weighing accuracy, and meets the sterile environment requirements of the pharmaceutical industry.
Smart Images
Figure CN224517928U_ABST
Abstract
Claims
1. A negative pressure weighing cover with uniform air flow distribution, comprising a cover body (1), a workbench (2) is arranged in the cover body (1), and a ventilation cavity (3) is arranged at the upper end of the cover body (1), characterized in that: The ventilation cavity (3) is provided with several V-shaped plates (4), the central axis of the V-shaped plates (4) coincides with the central axis of the cross section of the ventilation cavity (3), the V-shaped plates (4) are provided with air passage holes (5), the uppermost V-shaped plate (4) is provided with a perforated air supply plate (6), the perforated air supply plate (6) is provided with several air vents (7), the diameter of the air vents (7) gradually decreases from the central area to the edge area, and a G4 grade plate filter (8) is provided above the perforated air supply plate (6).
2. The negative pressure weighing hood for uniform distribution of airflow according to claim 1, characterized in that: Each of the V-shaped plates (4) has two air holes (5), which are symmetrically distributed about the central axis of the V-shaped plate (4).
3. The uniform air distribution negative pressure weighing hood according to claim 2, characterized in that: The ventilation holes (7) are arranged in a circular array, with the diameter of the ventilation holes (7) in the central area being 2-3 mm and the diameter of the ventilation holes (7) in the edge area being 1-1.5 mm.
4. The uniform air distribution negative pressure weighing hood of claim 1, wherein: A HEPA filter (9) is located below the bottom V-shaped plate (4).
5. The uniform air distribution negative pressure weighing hood of claim 1, wherein: The porous air supply plate (6) is made of 304 stainless steel and has a thickness of 3-8mm.