Muffin fan hush hood
First Claim
Patent Images
1. A low noise hood comprising:
- a fluid inlet having a fluid inlet area;
a fluid outlet, said fluid outlet having a fluid outlet area, said fluid outlet positioned with respect to said fluid inlet so as to preclude a line of sight from said fluid inlet to said fluid outlet; and
a fluid duct, said fluid duct connecting said fluid inlet to said fluid outlet, said fluid duct having a cross sectional flow area substantially equal to or greater than said inlet area so that if a laminar flow condition exists at said fluid inlet the laminar flow condition will be maintained throughout said fluid duct.
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Abstract
A low noise method and apparatus with the apparatus including a hood for mounting over an exhaust outlet duct to capture a fluid stream and then redirect the fluid stream to a fluid outlet in the hood through the use of smoothly curving duct that maintains the fluid flowing therethrough in a laminar flow condition with the inlet and outlet positioned such that there is no line of sight between the exhaust outlet duct and the fluid outlet duct in the hood.
24 Citations
22 Claims
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1. A low noise hood comprising:
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a fluid inlet having a fluid inlet area;
a fluid outlet, said fluid outlet having a fluid outlet area, said fluid outlet positioned with respect to said fluid inlet so as to preclude a line of sight from said fluid inlet to said fluid outlet; and
a fluid duct, said fluid duct connecting said fluid inlet to said fluid outlet, said fluid duct having a cross sectional flow area substantially equal to or greater than said inlet area so that if a laminar flow condition exists at said fluid inlet the laminar flow condition will be maintained throughout said fluid duct. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of reducing the noise from an exhaust fan comprising:
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placing an inlet duct around at least a portion of a fluid stream emanating from the exhaust fan;
capturing the emanating fluid stream and redirecting the fluid stream so as to preclude a line of sight from the inlet duct to an outlet duct;
restricting the velocity of the fluid stream to maintain the fluid stream in a laminar flow condition during fluid flow from said inlet duct to said outlet duct. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A low noise hood comprising:
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a fluid inlet having a fluid inlet area;
a fluid outlet, said fluid outlet having a fluid outlet area, said fluid outlet positioned with respect to said fluid inlet so as to preclude a line of sight from said fluid inlet to said fluid outlet; and
a smoothly curved fluid duct connecting said inlet to said fluid outlet so as to maintain a laminar flow condition throughout said fluid duct. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification