Clean air cabinet with valved exhaust
First Claim
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1. A clean air cabinet comprising;
- a housing including walls defining a blower chamber and a sample chamber having a front wall, a floor, a top wall and a back wall, said blower chamber disposed vertically above said sample chamber;
a blower disposed within said blower chamber and having a blower inlet and a blower outlet;
a filter disposed between said blower and said top wall and cooperating with said top wall to define a volume between said filter and said top wall;
said blower positioned for air to be forced downwardly from said blower outlet and travel in substantially a straight path through said filter and through said top wall into said sample chamber;
restricted airflow passages formed through said top wall for restricting airflow through said top wall for said volume to have an elevated pressure relative to said sample chamber and a reduced pressure relative to said blower chamber;
an exhaust plenum having an exhaust inlet in airflow communication with said volume and an exhaust outlet exterior of said housing;
an access opening in said front wall;
an air recycling plenum for directing airflow from said sample chamber to said blower chamber;
a valve having a first position for blocking airflow through said exhaust plenum and a second position for permitting airflow through said exhaust plenum;
an actuator for moving said valve between said first and second positions;
said actuator including means responsive to operation of said blower for automatically moving said valve to said first position when said blower is not operating and for automatically moving said valve to said second position when said blower is operating; and
said exhaust plenum sized for airflow from said volume through said exhaust plenum to generate a suction at said access opening to draw air from an exterior of said housing through said access opening.
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Abstract
A clean air cabinet includes a blower chamber and a sample chamber separated by a filter. A blower within the blower chamber forces air through the filter into the sample chamber. A perforated wall between the sample chamber and the filter provides a pressurized zone between the wall and the filter. An exhaust plenum connects the pressurized zone with an exterior of the cabinet. A cap is provided to close off the plenum when the blower is not operating.
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Citations
9 Claims
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1. A clean air cabinet comprising;
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a housing including walls defining a blower chamber and a sample chamber having a front wall, a floor, a top wall and a back wall, said blower chamber disposed vertically above said sample chamber; a blower disposed within said blower chamber and having a blower inlet and a blower outlet; a filter disposed between said blower and said top wall and cooperating with said top wall to define a volume between said filter and said top wall; said blower positioned for air to be forced downwardly from said blower outlet and travel in substantially a straight path through said filter and through said top wall into said sample chamber; restricted airflow passages formed through said top wall for restricting airflow through said top wall for said volume to have an elevated pressure relative to said sample chamber and a reduced pressure relative to said blower chamber; an exhaust plenum having an exhaust inlet in airflow communication with said volume and an exhaust outlet exterior of said housing; an access opening in said front wall; an air recycling plenum for directing airflow from said sample chamber to said blower chamber; a valve having a first position for blocking airflow through said exhaust plenum and a second position for permitting airflow through said exhaust plenum; an actuator for moving said valve between said first and second positions; said actuator including means responsive to operation of said blower for automatically moving said valve to said first position when said blower is not operating and for automatically moving said valve to said second position when said blower is operating; and said exhaust plenum sized for airflow from said volume through said exhaust plenum to generate a suction at said access opening to draw air from an exterior of said housing through said access opening.
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2. A clean air cabinet comprising:
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a housing including walls defining a blower chamber and sample chamber having a front wall, a floor, a top wall and a back wall; a blower disposed within said blower chamber and having a blower inlet and a blower outlet; a filter disposed between said blower and said top wall; said blower positioned for air to be forced from said blower outlet and through said filter and said top wall into said sample chamber; said filter spaced from said top wall to define a volume; said top wall having restricted airflow passages from said volume to said sample chamber for said volume to have an elevated pressure relative to said sample chamber and a reduced pressure relative to said blower chamber; an exhaust plenum having an exhaust inlet in airflow communication with said volume and an exhaust outlet exterior of said housing; an access opening in said front wall; an air recycling plenum for directing airflow from said sample chamber to said blower chamber; a valve having a first position for blocking airflow through said exhaust plenum and a second position for permitting airflow through said exhaust plenum; an actuator for moving said valve between said first and second positions; said actuator includes means responsive to operation of said blower for automatically moving said valve to said first position when said blower is not operating and for automatically moving said valve to said second position when said blower is operating; and said exhaust plenum sized for airflow from said volume through said exhaust plenum to generate a suction at said access opening to draw air from an exterior of said housing through said access opening. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification