Pollution-free kitchen ventilator

Claim 2

Ventilating apparatus for kitchen cooking equipment comprising a hood adapted for mounting above said cooking equipment, said hood having a hollow back wall, a pair of hollow end walls and a hollow top wall, an exhaust duct in an upper portion of said back wall having an inlet opening under said top wall for smoke and grease-laden air from said cooking equipment, a grease extractor in said exhaust duct in said hollow back wall, an upper air outlet opening extending along the under side of said top wall at the front edge thereof, a pair of end air outlet openings extending along front edge portions of said end walls, an air supply duct in said top wall for said upper outlet opening, and air supply ducts in said end walls for said end outlet openings, said ducts in said end walls being connected with said duct in said top wall.

Claim 3

Apparatus as defined in claim 1 including an electrostatic precipitator in said exhaust duct downstream from said grease extractor.

Claim 4

Apparatus as defined in claim 2 including an activated charcoal filter in said exhaust duct downstream from said precipitator.

Claim 5

Apparatus as defined in claim 3 including deodorizing chemical spray means in said exhaust duct downstream from said charcoal filter.

Claim 6

Apparatus as defined in claim 4 including washing spray means for said grease extractor and precipitator.

Claim 7

Apparatus as defined in claim 5, said exhaust duct extending upward from said inlet opening with said grease extractor, precipitator, charcoal filter and deodorizing spray being disposed one above the other so that wash liquid from said precipitator drains through said grease extractor, and said charcoal filter and deodorizing spray are above said washing sprays.

Claim 8

Ventilating apparatus for kitchen cooking equipment comprising a hood adapted for mounting above said cooking equipment, an ascending exhaust duct having an inlet opening in said hood for smoke and grease-laden air from said cooking equipment, a grease and liquid collecting trough having a drain in the lower end of said duct, a grease extractor in said duct above said inlet opening, an electrostatic precipitator in said duct above said grease extractor, washing spray nozzles in said duct arranged to wash said grease extractor, washing spray nozzles in said duct directed upward toward the under side of said precipitator, and washing spray nozzles in said duct directed downward toward the upper side of said precipitator, the washing liquid from said precipitator draining through said grease extractor to said trough.

Claim 9

Ventilating apparatus for kitchen cooking equipment comprising a hood adapted for mounting above said cooking equipment, an ascending exhaust duct having an inlet opening in said hood for smoke and grease-laden air from said cooking equipment, a grease and liquid collecting trough having a drain in the lower end of said duct, a grease extractor in said duct above said inlet opening, an electrostatic precipitator in said duct above said grease extractor, washing spray nozzles in said duct arranged to wash said grease extractor, washing spray nozzles in said duct directed upward toward the under side of said precipitator, and washing spray nozzles in said duct directed downward toward the upper side of said precipitator, the washing liquid from said precipitator draining through said grease extractor to said trough.

Claim 10

Apparatus as defined in claim 7 including a charcoal filter in said duct above said precipitator, and a deodorizing chemical spray in said duct above said filter.

Claim 11

Ventilating apparatus for kitchen cooking equipment comprising a hood adapted for mounting above said cooking equipment, an exhaust duct in said hood having an inlet opening for smoke and grease-laden air from said cooking equipment, an air supply duct in said hood having an outlet opening in spaced relation to said inlet opening, a grease extractor in said exhaust duct, an electrostatic precipitator in said exhaust duct downstream from said grease extractor, an activated charcoal filter in said exhaust duct downstream from said precipitator, deodorizing chemical spray means in said exhaust duct downstream from said charcoal filter, and washing spray means for said grease extractor and precipitator.

Claim 12

Ventilating apparatus for kitchen cooking equipment comprising a hood adapted for mounting above said cooking equipment, an exhaust duct in said hood having an inlet opening for smoke and grease-laden air from said cooking equipment, an air supply duct in said hood having an outlet opening in spaced relation to said inlet opening, a grease extractor in said exhaust duct, an electrostatic precipitator in said exhaust duct downstream from said grease extractor, an activated charcoal filter in said exhaust duct downstream from said precipitator, deodorizing chemical spray means in said exhaust duct downstream from said charcoal filter, and washing spray means for said grease extractor and precipitator.

Claim 13

Apparatus as defined in claim 9 including a control system having a start switch arranged to start fans in said exhaust and air supply ducts, energize said precipitator and start said chemical spray means; a timing device; a stop switch arranged to stop said fans and said chemical spray means, deenergize said precipitator and start said timing device; said timing device then starting said washing spray means for a washing period, stopping said washing spray means after said washing period and starting said fans for a drying period, and then stopping said fans.

Claim 14

Apparatus as defined in claim 10 including a thermostatic switch in said exhaust duct and fire dampers in said exhaust and air supply ducts, and means in said system actuated by said thermostatic switch in case of fire in said exhaust duct to stop said fans, close said dampers, and operate said washing sprays for fire extinguishing purposes.

Claim 15

Ventilating apparatus for kitchen cooking equipment comprising an exhaust duct for smoke and grease-laden air from said cooking equipment; an exhaust fan; a grease extractor and electrostatic precipitator in said duct; washing spray means for said grease extractor and precipitator; a control system; a start switch in said control system arranged to start said fan and energize said precipitator; a timing device in said system; and a stop switch arranged to stop said fan, deenergize said precipitator and start said timing device; said timing device then starting said washing spray means for a washing period, stopping said washing spray means after said washing period and starting said fan for a drying period, and then stopping said fan.

Claim 16

Ventilating apparatus for kitchen cooking equipment comprising an exhaust duct for smoke and grease-laden air from said cooking equipment; an exhaust fan; a grease extractor and electrostatic precipitator in said duct; washing spray means for said grease extractor and precipitator; a control system; a start switch in said control system arranged to start said fan and energize said precipitator; a timing device in said system; and a stop switch arranged to stop said fan, deenergize said precipitator and start said timing device; said timing device then starting said washing spray means for a washing period, stopping said washing spray means after said washing period and starting said fan for a drying period, and then stopping said fan.

Claim 17

Apparatus as defined in claim 12 including a thermostatic switch and fire damper in said duct, and means in said system actuated by said thermostatic switch in case of fire in the duct to stop said fan, close said damper and operate said washing sprays for fire extinguishing purposes.

Claim 18

Ventilating apparatus for kitchen cOoking equipment comprising a hood adapted for mounting above said cooking equipment, an ascending exhaust duct having an inlet opening in said hood for smoke and grease-laden air from said cooking equipment, a grease and liquid collecting trough in the lower end of said duct and having a drain, a grease extractor in said duct above said inlet opening and trough, washing spray means in said grease extractor arranged to wash said grease extractor, an electrostatic precipitator in said duct above said grease extractor, washing spray means in said duct adjacent said precipitator arranged to wash said precipitator, and means including said duct for draining the washing liquid from said precipitator through said grease extractor into said trough to wash said grease extractor.

Claim 19

Ventilating apparatus for kitchen cOoking equipment comprising a hood adapted for mounting above said cooking equipment, an ascending exhaust duct having an inlet opening in said hood for smoke and grease-laden air from said cooking equipment, a grease and liquid collecting trough in the lower end of said duct and having a drain, a grease extractor in said duct above said inlet opening and trough, washing spray means in said grease extractor arranged to wash said grease extractor, an electrostatic precipitator in said duct above said grease extractor, washing spray means in said duct adjacent said precipitator arranged to wash said precipitator, and means including said duct for draining the washing liquid from said precipitator through said grease extractor into said trough to wash said grease extractor.

Claim 20

Ventilating apparatus for kitchen cooking equipment comprising an exhaust duct for smoke and grease-laden air from said cooking equipment, a grease extractor in said duct, said duct extending upward from said grease extractor, an electrostatic precipitator in said duct above said grease extractor, washing spray means in said grease extractor, washing spray means for said precipitator, a control system having a timing device for programming said washing spray means in a wash cycle, said timing device initiating said wash cycle by starting said washing spray means for said precipitator, wash liquid from said precipitator draining through said duct and grease extractor for a first washing of said grease extractor, and said timing device thereafter stopping said washing spray means for said precipitator and starting said washing spray means in said grease extractor for a second washing of said grease extractor, and further including an exhaust fan in said duct, a start switch arranged to start said fan and energize said precipitator, a stop switch arranged to stop said fan, deenergize said precipitator and start said timing device, and means controlled by said timing device to stop said washing spray means in said grease extractor, start said fan for a drying period, and then stop said fan and timing device.

Claim 21

Ventilating apparatus for kitchen cooking equipment comprising an exhaust duct for smoke and grease-laden air from said cooking equipment, a grease extractor in said duct, said duct extending upward from said grease extractor, an electrostatic precipitator in said duct above said grease extractor, washing spray means in said grease extractor, washing spray means for said precipitator, a control system having a timing device for programming said washing spray means in a wash cycle, said timing device initiating said wash cycle by starting said washing spray means for said precipitator, wash liquid from said precipitator draining through said duct and grease extractor for a first washing of said grease extractor, and said timing device thereafter stopping said washing spray means for said precipitator and starting said washing spray means in said grease extractor for a second washing of said grease extractor, and further including an exhaust fan in said duct, a start switch arranged to start said fan and energize said precipitator, a stop switch arranged to stop said fan, deenergize said precipitator and start said timing device, and means controlled by said timing device to stop said washing spray means in said grease extractor, start said fan for a drying period, and then stop said fan and timing device.