GB910357A - Improvements in or relating to ultrasonic vibrators for dispersing fluids - Google Patents

Abstract

910,357. Carburetting apparatus. MULLARD Ltd. June 29, 1959 [July 7, 1958], No. 21774/58. Class 7(3) [Also in Group XXIX] Ultrasonic apparatus for atomizing a liquid in a gas, e.g. for producing fuel-air mixtures for I.C. engines, comprises a pipe 7 for the passage of the gas, a velocity transformer horn 2 resonant at an ultrasonic frequency and having its free vibratory end face within the pipe, an electro-mechanical transducer 1, which may be of the magneto-striction or Piezo-electric type, coupled to the other end of the velocity transformer for setting it into vibration at the ultrasonic frequency, a duct 3, 4 extending internally of the horn and open at one end in the wall of the horn at the substantially vibration-free nodal plane thereof and open at its other end in the vibratory end face, and a liquid inflow pipe 5 connected to the duct at the nodal plane end thereof. A liquid reservoir 6 provides means for determining the liquid level in the duct 3, the end of the duct 3 being concave and forming a small well for the liquid. On applying ultrasonic vibration from the transducer 1 to the horn 2, liquid is forced out of the duct 3 in the form of a fog and into gas in the pipe 7. Two transducer horn assemblies may be mounted with their horns pointing towards each other within the pipe and the vibrators operating in antiphase. Alternatively, two horns may be mounted at an angle to each other within the pipe. In a further arrangement, the resonant horn may be attached to a coupling member attached to the transducer, the resonant frequency of the horn and coupling member being ultrasonic and the transducer optionally being operated at sonic frequency by pulses of electric current the repetition rate of which may be varied to meter the flow of liquid.