GB698925A - Improvements in air humidifying systems and apparatus - Google Patents

Abstract

698,925. Humidifying air. PARKS-CRAMER CO. Dec. 12, 1951 [July 21, 1951], No. 29107/51. Class 55(ii) [Also in Group XXTX] In a humidifying system comprising atomizers supplied with air and water under pressure, the water pressure being produced by the air pressure which is regulated to control the humidity, supplementary means acting during a predetermined pressure range causes the pressure in the water vessel supplying the atomizers to vary at a faster rate than that in the air conduit so as to effect a greater variation in the evaporative output of the atomizers than is produced by the humidity regulator. In the form shown in which the air pressure producing the water pressure is maintained throughout a predetermined range less than the air pressure at the atomizers by an amount changing oppositely to the changes in such air pressure, a compressed air conduit 3 feeding atomizers 2 leads also to a water pressurizer 5 having a water inlet pipe 6, float valve 7, waste pipe 8, and an outlet pipe 4 leading to the atomizers. Connected to the compressed air inlet branch by a T section 19 a differential pressure governor is fitted comprising an exhaust port 23 the passage to which is increased as the air pressure falls so as to increase the difference between air and water pressure at the atomizers as the air pressure falls in dependence on a humidity-affected regulator 9. This may be as described in Specification 698,916, [Group XXIX]. A spring-loaded diaphragm 17 in a casing 14 depresses a ported tube 25 against a spring 27 by an amount dependent on the pressure of air which passes from conduit 3 through a restriction 31 and an opening 20 into the space below the diaphragm. As pressure falls ports 29 in the lower portion of the tube are uncovered and allow air to escape through the exhaust port. A diaphragm spring adjusting screw 22 enables the pressure point at which the valve starts to open to be selected: e.g. with an air pressure of 10 lb. the governor may be so adjusted that the reduced water pressure provides a minimum output for continuous spraying. In a modification the conduit restriction is disposed beyond the governor connection, the valve's responsiveness to pressure changes being increased. In this form the valve tube opens at the bottom into a space communicating with the conduit on the pressurizer side of the restriction and is closed at its upper part so that the space under the diaphragm is not connected to the exhaust passage. In an example employing a source of compressed air of 30 lb. pressure and with a water pressure 1.3 1b. less due to the level in the pressurizer being 3 ft. below that of the atomizers, the governor is set to increase the pressure difference to 2.1 lb. when the air pressure falls below 20 lb. and reaches the minimum of 10 1b. below which the atomizers are shut off entirely, the output at this level being reduced to 15 lb. instead of 5.5 lb.