SAFETY WORKBENCH WITH REGULATED CIRCULATION FLOW AND METHOD OF OPERATING SAME
The invention relates to a safety workbench. The safety workbench is provided with a working cavity surrounded by a shell. The safety workbench is provided with an exhaust fan and a circulating air fan which are used for conveying air flow in the safety workbench. A blower adapted to blow a portion...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a safety workbench. The safety workbench is provided with a working cavity surrounded by a shell. The safety workbench is provided with an exhaust fan and a circulating air fan which are used for conveying air flow in the safety workbench. A blower adapted to blow a portion of the air flow drawn in by the exhaust fan through the exhaust filter as an exhaust flow out of thesafety table and blow a portion of the air flow drawn in by the circulating air fan through the circulating air filter as a downward directed circulating air flow into the working chamber; the deviceis provided with an adjusting device, a differential pressure sensor and two pressure transmitters connected with the differential pressure sensor. The pressure transmitter is adapted to measure pressure at two different locations within the safety table, where a first pressure transmitter is arranged adjacent to fan blades on a low pressure side of the circulating air fan and a second pressure transmitter is arranged wit |
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