Fresh air damper arrangement for room air conditioner

Claim 2

In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first intake opeNing in a side wall of said casing and positioned for delivery of outside fresh air into said condenser compartment, said partition forming the outer vertical side wall of a centrifugal impeller scroll housing, said scroll housing having an inner side wall spaced therefrom including an air intake orifice therein for receiving a stream of recirculated room air drawn through said evaporator compartment for subsequent discharge via the scroll housing exhaust passage into the room, a second rectangular fresh air intake opening in said scroll housing outer side wall having a plurality of inwardly and upwardly inclined horizontally disposed louvers extending into said scroll housing air exhaust passage, a rectangular damper door pivotally disposed on the condenser compartment side of said scroll housing outer side wall closing said second fresh air intake opening, selective actuator means for moving said door between its closed position and an open position inclined outwardly into the path of the inward flow of fresh air flow through said first intake opening, duct means supported on said partition in the form of a three-sided box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position; said upper, lower and back walls of said channel duct presenting a minimum of obstruction to the incoming flow of condenser cooling outside air when said door is in its closed position, said door when in its opened position having its free vertical edge positioned contacting said channel duct back wall so as to form with said upper and lower walls a scoop-like elbow duct to direct a portion of the fresh air entering through said first intake opening to flow through said second opening, said louvers cooperating with the upward flow of recirculated air in said scroll-housing exhaust passage thereover presenting Venturi creating deflectors whereby fresh air is drawn into said blower scroll housing for mixture with the flow of recirculated room air.

Claim 3

In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first intake opening in a side wall of said casing and positioned for delivery of outside fresh air into said condenser compartment, said partition forming the outer vertical side wall of a centrifugal impeller scroll housing, said scroll housing having an inner side wall spaced therefrom including an air intake orifice therein for receiving a stream of recirculated room air drawn through said evaporator compartment for subsequent discharge from said scroll housing into the room, said centrifugal impeller comprising a blower wheel having its center of rotation eccentrically arranged within said scroll housing defining a vertical air exhaust passageway of widening spiral form, a second rectangular fresh air intake opening in said scroll housing outer side wall having a plurality of inwardly and upwardly inclined horizontally disposed louvers extending into said scroll housing air exhaust passage, a rectangular damper door pivotally disposed on the condenser compartment side of said scroll housing outer side wall closing said second fresh air intake opening, selective actuator means for moving said door between its closed position and an open position inclined outwardly at an angle of approximately 45* into the path of the inward flow of fresh air flow through said first intake opening, duct means supported on said partition in the form of an open-ended box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position; the upstream edges of said upper, lower and back walls of said channel duct located in close proximity to said casing side wall so as to envelop a portion of said first intake opening, said door when in its opened position having its free vertical edge positioned contacting said channel duct back wall so as to form with said upper and lower walls a scoop-like elbow duct to direct a portion of the fresh air entering through said first intake opening to flow through said second opening, said upstream edge of said channel back wall having an outwardly directed air divider flange formed therein substantially parallel to said casing side wall to increase the amount of air flow into said channel duct when said door is in its opened position, said louvers cooperating with the upward flow of recirculated air in said scroll-housing exhaust passage thereover presenting Venturi creating deflectors whereby fresh air is drawn into said blower scroll housing for mixture with the flow of recirculated room air.

Claim 4

In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first intake opening in a side wall of said casing and positioned for delivery of outside fresh air into said condenser compartment, said partition forming the outer vertical side wall of a centrifugal impeller scroll housing, said scroll housing having an inner side wall spaced therefrom including an air intake orifice therein for receiving a stream of recirculated room air drawn through said evaporator compartment for subsequent discharge from said scroll housing into the room, said centrifugal impeller comprising a blower wheel having its center of rotation eccentrically arranged within said scroll housing defining a vertical air exhaust passageway of widening spiral form, a second rectangular fresh air intake opening in said scroll housing outer side wall having a plurality of inwardly and upwardly inclined horizontally disposed louvers extending into said scroll housing air exhaust passage, a rectangular damper door pivotally disposed on the condenser compartment side of said scroll housing outer side wall closing said second fresh air intake opening, selective actuator means for moving said door between its closed position and an open position inclined outwardly at an angle of approximately 45* into the path of the inward flow of fresh air flow through said first intake opening, duct means supported on said partition in the form of an open-ended box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position; the upstream edges of said upper, lower and back walls of said channel duct located in close proximity to said casing side wall so as to envelop a portion of said first intake opening, said door when in its opened position having its free vertical edge positioned contacting said channel duct back wall so as to form with said upper and lower walls a scoop-like elbow duct to direct a portion of the fresh air entering through said first intake opening to flow through said second opening, said upstream edge of said channel back wall having an outwardly directed air divider flange formed therein substantially parallel to said casing side wall to increase the amount of air flow into said channel duct when said door is in its opened position, said louvers cooperating with the upward flow of recirculated air in said scroll-housing exhaust passage thereover presenting Venturi creating deflectors whereby fresh air is drawn into said blower scroll housing for mixture with the flow of recirculated room air.

Claim 5

In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first fresh air intake opening in said casing positioned for delivery of outside air into said condenser compartment, a centrifugal impeller scroll housing in said evaporator compartment including inner and outer side walls and including a vertically disposed air exhaust passage, an air inlet orifice in said scroll housing inner side wall concentric with said blower wheel communicating with said evaporator compartment for receiving a stream of recirculated air withdrawn from the room into said evaporator compartment for subsequent discharge into the room, a second rectangular fresh air intake opening in said scroll housing outer side wall communicating with said condenser compartment, said second intake opening having a plurality of horizontally extending parallel louvers angularly disposed directing the flow of fresh air upwardly into said blower scroll air exhaust passage, a rectangular damper door, means for pivotally supporting said door on said scroll housing outer side wall covering said second fresh air intake opening including a plurality of hinge fasteners comprising a U-shaped resilient clip portion which snaps over integrally molded rib members on said scroll housing outer side wall, each said hinge fastener having an elongate integral arm disposed at right angles to said clip, the outer end of said arm being bent to provide an inwardly curved finger extending into an elongated aperture in said door, said clip arm having a lanced tab bent outwardly therefrom providing stop means to limit the amount of insertion of said finger in said door aperture, selective actuator means for moving said door between its closed position and an open position inclined outwardly at an angle of approximately 45* into said condenser compartment in the path of the inward flow of fresh air through said first fresh air intake opening, duct means supported on said blower scroll outer side wall in the form of a three-sided box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position, the upstream edges of said upper, lower and back walls of said channel duct located in close proximity to said casing side wall presenting a minimum of obstruction to the incoming fresh air flow through said first intake opening when said door is in its closed position, said door when in its opened position having its vertical free edge contacting said channel back wall approximately midway between its upstream and downstream vertical edges so as to form with said upper and lower channel walls a scoop-like elbow duct causing a portion of the fresh air entering through said first intake opening to flow through said second opening into said Scroll housing.

Claim 6

In a room air conditioning unit, the combination comprising: a casing enclosing a condenser compartment and an evaporator compartment separated by a transverse partition, a first fresh air intake opening in said casing positioned for delivery of outside air into said condenser compartment, a centrifugal impeller scroll housing in said evaporator compartment including inner and outer side walls and including a vertically disposed air exhaust passage, an air inlet orifice in said scroll housing inner side wall concentric with said blower wheel communicating with said evaporator compartment for receiving a stream of recirculated air withdrawn from the room into said evaporator compartment for subsequent discharge into the room, a second rectangular fresh air intake opening in said scroll housing outer side wall communicating with said condenser compartment, said second intake opening having a plurality of horizontally extending parallel louvers angularly disposed directing the flow of fresh air upwardly into said blower scroll air exhaust passage, a rectangular damper door, means for pivotally supporting said door on said scroll housing outer side wall covering said second fresh air intake opening including a plurality of hinge fasteners comprising a U-shaped resilient clip portion which snaps over integrally molded rib members on said scroll housing outer side wall, each said hinge fastener having an elongate integral arm disposed at right angles to said clip, the outer end of said arm being bent to provide an inwardly curved finger extending into an elongated aperture in said door, said clip arm having a lanced tab bent outwardly therefrom providing stop means to limit the amount of insertion of said finger in said door aperture, selective actuator means for moving said door between its closed position and an open position inclined outwardly at an angle of approximately 45* into said condenser compartment in the path of the inward flow of fresh air through said first fresh air intake opening, duct means supported on said blower scroll outer side wall in the form of a three-sided box-like channel having horizontal upper and lower walls and a vertical back wall overlying said second intake opening, said channel back wall spaced rearwardly of said second intake opening so as to be located in a plane parallel to the plane of said door in its closed position, the upstream edges of said upper, lower and back walls of said channel duct located in close proximity to said casing side wall presenting a minimum of obstruction to the incoming fresh air flow through said first intake opening when said door is in its closed position, said door when in its opened position having its vertical free edge contacting said channel back wall approximately midway between its upstream and downstream vertical edges so as to form with said upper and lower channel walls a scoop-like elbow duct causing a portion of the fresh air entering through said first intake opening to flow through said second opening into said Scroll housing.