Aspirating thermostat

Claim 2

An aspirating thermostat for use with an air duct ventilation system, said system having a mechanism for varying the volume of air flow through the duct outlet into the room being temperature conditioned, the improvement comprising: means defining a passage for exhausting air from said mechanism and terminating in a thermostatically controlled bleed port, a casing for said thermostat having an inlet and an outlet for accommodating flow of ambient air therethrough, said casing being connected with said passage defining means wherein said bleed port opens inside of said casing, a thermally responsive valve means mounted inside said casing intermediate said inlet and said outlet thereof and movable toward and away from said bleed Port to vary the exhaust of air from said mechanism to thereby control pressure therein, said valve means being movable in response to a change in temperature in the ambient air, means located within said casing for inducing by aspiration a flow of ambient air through said inlet across said thermally responsive valve means and out said outlet whereby said valve means is positioned and volume of air flow through said duct is varied in relation to the temperature of the ambient air, said inlet and said outlet for said casing being in communicating relationship with the room being temperature conditioned by said system thereby creating a continuous flow of room air over said thermally responsive valve means to accurately sense the room air temperature and to vary said air flow volume accordingly and a restrictor member operatively associated with said bleed port and adjustable to control the flow therethrough, said restrictor member being accessible for adjustment exteriorly of said casing to limit the maximum flow rate through said bleed port and thereby limit the maximum quantity of conditioned air discharged into said room.

Claim 3

The combination as in claim 1 wherein said casing includes a partition separating said inlet from said outlet and a wall spaced from said partition and cooperating therewith to define a narrow ejector passage within said casing, said ejector passage being operable to create a region of reduced pressure to facilitate in the aspiration of room air over said thermally responsive valve means, said ejector passage being in communicating relationship with both said inlet and said outlet.

Claim 4

The combination as in claim 1 including a temperature adjustment lever, means for mounting at least a portion of said temperature adjustment lever interiorly of said casing, and means including reduction gearing for interconnecting said thermally responsive valve means to said temperature adjustment lever, said interconnecting means operable to permit a room temperature setting by varying the position of said thermally responsive valve means with respect to said bleed port.

Claim 5

An aspirating thermostat for use with an air duct ventilation system, said system having a damper plate in the air duct and movable to variably restrict the air flow through said air duct, a pneumatically operated actuator means operably coupled to said damper plate to move and to vary the volume of said air flow through said duct in proportion to pressure in said actuator means, means defining a passage for exhausting air from said actuator means and terminating in a thermostatically controlled bleed port, a casing for said thermostat having an inlet and an outlet for accommodating flow of ambinet air therethrough, said casing being connected with said passage defining means wherein said bleed port opens inside of said casing, a thermally responsive valve means mounted inside said casing intermediate said inlet and outlet thereof and movable toward and away from said bleed port to vary the exhaust of air from said actuator means to thereby control pressure therein, said valve means being movable in response to a change in temperature in the ambient air, means located within said casing for inducing by aspiration a flow of ambient air through said inlet across said thermally responsive valve means and out said outlet whereby said valve means is positioned and the volume of air flow through said duct is varied in relationship to the temperature of the ambient air, and an aspirating T including a conduit extending from said duct to connection with said passage defining means whereby pressure air flow from said duct operates said actuator, said passage defining means including a section extending downstream of said aspirating T and terminating in said bleed port whereby air flow through said conduit across the aspirating T to said bleed port induces the exhaust air out of said actuator means to said exhaust port and insures that said pneuMatically operated actuator means is in proper condition with respect to said damper plate and the desired temperature, said conduit being of substantially smaller size than said passage deforming means at its connection therewith to thereby facilitate the inducement of air from said actuating means.

Claim 6

An aspirating thermostat for use with an air duct ventilation system, said system having a damper plate in the air duct and movable to variably restrict the air flow through said air duct, a pneumatically operated actuator means operably coupled to said damper plate to move and to vary the volume of said air flow through said duct in proportion to pressure in said actuator means, means defining a passage for exhausting air from said actuator means and terminating in a thermostatically controlled bleed port, a casing for said thermostat having an inlet and an outlet for accommodating flow of ambinet air therethrough, said casing being connected with said passage defining means wherein said bleed port opens inside of said casing, a thermally responsive valve means mounted inside said casing intermediate said inlet and outlet thereof and movable toward and away from said bleed port to vary the exhaust of air from said actuator means to thereby control pressure therein, said valve means being movable in response to a change in temperature in the ambient air, means located within said casing for inducing by aspiration a flow of ambient air through said inlet across said thermally responsive valve means and out said outlet whereby said valve means is positioned and the volume of air flow through said duct is varied in relationship to the temperature of the ambient air, and an aspirating T including a conduit extending from said duct to connection with said passage defining means whereby pressure air flow from said duct operates said actuator, said passage defining means including a section extending downstream of said aspirating T and terminating in said bleed port whereby air flow through said conduit across the aspirating T to said bleed port induces the exhaust air out of said actuator means to said exhaust port and insures that said pneuMatically operated actuator means is in proper condition with respect to said damper plate and the desired temperature, said conduit being of substantially smaller size than said passage deforming means at its connection therewith to thereby facilitate the inducement of air from said actuating means.