Pneumatic thermostat

Claim 2

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat capable of generating from a variable pressure air supply said air pressure signal indicative of ambient temperature, said thermostat including a pressure reducing chamber having a lower and an upper section; said lower section adapted to receive from said air flow distribution apparatus upstream from said regulating means said variable pressure air supply and said upper section having a first outlet port in communication with the air flow distribution apparatus downstream from said regulating means; means for intermittently bleeding said lower section to said upper section to produce a constant pressure within said lower section; a restriction nozzle adapted to continuously bleed from said lower section to a pressure transmitting chamber a substantially constant pressure air flow, said pressure transmitting chamber communicating with an exhaust nozzle which vents to a thermometric chamber, said thermometric chamber having an inlet port to receive ambient air from the enclosed area and a second outlet port; means disposed within said thermometric chamber and adjacent said exhaust nozzle for variably inhibiting the air flow from said exhaust nozzle automatically in response to changes in ambient temperature thereby producing a pressure within said pressure transmitting chamber indicative of said ambient temperature, a third air outlet port in communication with said pressure transmitting chamber to thereby transmit said pressure signal to said regulating means; and means for aspirating said thermometric chamber disposed adjacent to said second air outlet port, said aspirating means in communication with said variable pressure air supply and adapted to utilize said air supply to aspirate ambient air through said thermometric chamber.

Claim 3

The improved air flow distribution apparatus of claim 1 wherein said pressure reducing chamber and said pressure transmitting chamber are positioned adjacent to said regulating means, said thermometric chamber and said aspirating means are positioned remote from said regulating means, and conduit means connect said pressure transmitting chamber with said exhaust nozzle and said aspirating means with said variable pressure air supply.

Claim 4

The improved air flow distribution apparatus of claim 2 wherein filtering means are disposed between said variable pressure air supply and both said air receiving means and said aspirating means.

Claim 5

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat including means for receiving a variable pressure air supply; means for generating from said air supply said pressure signal indicative of said temperature, said signal being referenced to the pressure in said air distribution apparatus downstream from said regulating means; and means for aspirating ambient air by and through said temperature responsive means.

Claim 6

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat including means for receiving a variable pressure air supply; means for generating from said air supply said pressure signal indicative of said temperature, said signal being referenced to the pressure in said air distribution apparatus downstream from said regulating means; and means for aspirating ambient air by and through said temperature responsive means.

Claim 7

The improved air flow distribution apparatus of claim 4 wherein said signal generating means includes a pressure reducing chamber in communication with said air receiving means, said chamber having an air outlet in communication with the air distribution apparatus downstream from said regulating means and an air restriction nozzle, and means for intermittently bleeding said chamber through said outlet to produce a constant pressure within said chamber.

Claim 8

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat capable of generating from a variable pressure air supply said air pressure signal indicative of ambient temperature, said thermostat including means for receiving from said air flow distribution apparatus upstream from said regulating means said variable pressure air supply, said receiving means in communication with means for separating said air supply into two portions, a pressure reducing chamber having a lower and an upper section, said lower section adapted to receive the first portion of said air supply, said upper section having a first outlet port in communication with said air distribution apparatus downstream from said regulating means, means for intermittently bleeding said lower section to said upper section to produce a constant pressure within said lower section, a restriction nozzle adapted to continuously bleed from said lower section to a pressure transmitting chamber a substantially constant pressure air flow, said pressure transmitting chamber communicating with an exhaust nozzle which vents to a thermometric chamber, said thermometric chamber having an inlet port to receive ambient air from the enclosed area and a second outlet port, means disposed within said thermometric chamber and adjacent said exhaust nozzle for variably inhibiting the air flow from said exhaust nozzle automatically in reponse to changes in ambient temperature thereby producing a pressure within said pressure transmitting chamber indicative of said ambient temperature, a third air outlet port in communication with said pressure transmitting chamber to thereby transmit said pressure signal to said regulating means, said signal also being indicative of ambient temperature, and means for aspirating said thermometric chamber disposed adjacent to said second air outlet port, said aspirating means in communication with said air supply receiving means and adapted to utilize the second portion of said air supply to aspirate ambient air through said thermometric chamber.

Claim 9

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat capable of generating from a variable pressure air supply said air pressure signal indicative of ambient temperature, said thermostat including means for receiving from said air flow distribution apparatus upstream from said regulating means said variable pressure air supply, said receiving means in communication with means for separating said air supply into two portions, a pressure reducing chamber having a lower and an upper section, said lower section adapted to receive the first portion of said air supply, said upper section having a first outlet port in communication with said air distribution apparatus downstream from said regulating means, means for intermittently bleeding said lower section to said upper section to produce a constant pressure within said lower section, a restriction nozzle adapted to continuously bleed from said lower section to a pressure transmitting chamber a substantially constant pressure air flow, said pressure transmitting chamber communicating with an exhaust nozzle which vents to a thermometric chamber, said thermometric chamber having an inlet port to receive ambient air from the enclosed area and a second outlet port, means disposed within said thermometric chamber and adjacent said exhaust nozzle for variably inhibiting the air flow from said exhaust nozzle automatically in reponse to changes in ambient temperature thereby producing a pressure within said pressure transmitting chamber indicative of said ambient temperature, a third air outlet port in communication with said pressure transmitting chamber to thereby transmit said pressure signal to said regulating means, said signal also being indicative of ambient temperature, and means for aspirating said thermometric chamber disposed adjacent to said second air outlet port, said aspirating means in communication with said air supply receiving means and adapted to utilize the second portion of said air supply to aspirate ambient air through said thermometric chamber.

Claim 10

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat capable of generating from a variable pressure air supply said air pressure signal indicative of ambient temperature, said thermostat including means for receiving from said air flow distribution apparatus upstream from said regulating means said variable pressure air supply, a pressure reducing chamber having a lower and an upper section, said lower section adapted to receive said air supply from said air receiving means, said upper section having a first outlet port, means for intermittently bleeding said lower secton to said upper section to produce a constant pressure within said lower section, a restriction nozzle adapted to continuously bleed from said lower section to a pressure transmitting chamber a substantially constant pressure air flow, said pressure transmitting chamber communicating with an exhaust nozzle which vents to a thermometric chamber, said thermometric chamber having an inlet port to receive ambient air from the enclosed area and a second outlet port, means disposed within said thermometric chamber and adjacent said exhaust nozzle for variably inhibiting the air flow from said exhaust nozzle automatically in response to changes in ambient temperature thereby producing a pressure within said pressure transmitting chamber indicative of said ambient temperature, a third air outlet port in communication with said pressure transmitting chamber to thereby transmit said pressure signal to said regulating means, said signal also being indicative of ambient temperature, and means for aspirating said thermometric chamber disposed adjacent to said second air outlet port, said aspirating means in communication with said variable pressure air supply and adapted to utilize said air supply to aspirate ambient air through said thermometric chamber.

Claim 11

In an air flow distribution apparatus having a means for supplying pressurized air, a means for diffusing said air into an enclosed area, and a means for regulating the air flow to said diffusing means from said supply means in response to an air pressure signal indicative of temperature within the enclosed area, the improvement comprising: a pneumatic thermostat capable of generating from a variable pressure air supply said air pressure signal indicative of ambient temperature, said thermostat including means for receiving from said air flow distribution apparatus upstream from said regulating means said variable pressure air supply, a pressure reducing chamber having a lower and an upper section, said lower section adapted to receive said air supply from said air receiving means, said upper section having a first outlet port, means for intermittently bleeding said lower secton to said upper section to produce a constant pressure within said lower section, a restriction nozzle adapted to continuously bleed from said lower section to a pressure transmitting chamber a substantially constant pressure air flow, said pressure transmitting chamber communicating with an exhaust nozzle which vents to a thermometric chamber, said thermometric chamber having an inlet port to receive ambient air from the enclosed area and a second outlet port, means disposed within said thermometric chamber and adjacent said exhaust nozzle for variably inhibiting the air flow from said exhaust nozzle automatically in response to changes in ambient temperature thereby producing a pressure within said pressure transmitting chamber indicative of said ambient temperature, a third air outlet port in communication with said pressure transmitting chamber to thereby transmit said pressure signal to said regulating means, said signal also being indicative of ambient temperature, and means for aspirating said thermometric chamber disposed adjacent to said second air outlet port, said aspirating means in communication with said variable pressure air supply and adapted to utilize said air supply to aspirate ambient air through said thermometric chamber.