Ultrasonic generator and burner

Claim 2

An ultrasonic generator comprising in combination a. an ultrasonic transducer whose motional admittance becomes maximum at a resonant frequency, b. an oscillator comprising an amplifier driving said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency, whereby a surface of the transducer oscillates and a feedback circuit for feeding back to said amplifier an AC control voltage in proportion to the driving current which drives said ultrasonic transducer, c. a DC power source for supplying DC power to said oscillator, said DC power source being provided with a DC voltage regulator and d. means for converting said AC control voltage into a DC control input voltage for said regulator.

Claim 3

An ultrasonic atomizer comprising an ultrasonic generator as Defined in claim 1 further comprising means for supplying liquid to be atomized to the oscillating surface of said ultrasonic transducer.

Claim 4

An ultrasonic atomizer comprising an ultrasonic generator as defined in claim 1 wherein said DC power source comprising means for selectively supplying two different output voltages.

Claim 5

An ultrasonic atomizer as defined in claim 2 wherein said converting means comprises a switching circuit for selectively supplying one of two different output voltages, and a control circuit for controlling said switching circuit.

Claim 6

An ultrasonic atomizer as defined in claim 4 further comprising means responsive to said driving current for controlling the flow rate of liquid to be supplied to said ultrasonic transducer.

Claim 7

An ultrasonic atomizer as defined in claim 4 further comprising means responsive to said driving current for controlling the flow rate of liquid to be supplied to said ultrasonic transducer.

Claim 8

An ultrasonic atomizer as defined in claim 2 further comprising timer means connected to said DC voltage regulator for increasing said control input voltage from 0 percent to 100 percent within a predetermined time interval.

Claim 9

An ultrasonic generator as defined in claim 7 further comprising means responsive to said driving current for controlling the flow rate of liquid to be supplied to said ultrasonic transducer.

Claim 10

An ultrasonic atomizer as defined in claim 7 further comprising means for detecting the temperature of liquid to be atomized and for varying said control input voltage in response to the detected temperature.

Claim 11

An ultrasonic atomizer comprising in combination a. an ultrasonic transducer whose motional admittance becomes maximum at a resonant frequency, b. an oscillator comprising an amplifier driving said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency, whereby the surface of the transducer oscillates and a feedback circuit for feeding back to said amplifier an AC control voltage in proportion to the driving current which drives said ultrasonic transducer, c. a DC power source supplying DC power to said oscillator, d. liquid to be atomized to the oscillating surface of said ultrasonic transducer and e. means responsive to said driving current for controlling the flow rate of liquid to be supplied to said ultrasonic transducer.

Claim 12

An ultrasonic atomizer comprising in combination a. an ultrasonic transducer whose motional admittance becomes maximum at a resonant frequency, b. an oscillator comprising an amplifier driving said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency, whereby the surface of the transducer oscillates and a feedback circuit for feeding back to said amplifier an AC control voltage in proportion to the driving current which drives said ultrasonic transducer, c. a DC power source supplying DC power to said oscillator, d. liquid to be atomized to the oscillating surface of said ultrasonic transducer and e. means responsive to said driving current for controlling the flow rate of liquid to be supplied to said ultrasonic transducer.

Claim 13

An ultrasonic liquid fuel burner comprising A an ultrasonic generator comprising a. an ultrasonic transducer whose motional admittance is maximum at a resonant frequency, b. an oscillator comprising an amplifier adapted to drive said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency, and a feedback circuit for feeding back to said amplifier an AC voltage in proportion to the driving current which drives said ultrasonic transducer, c. A DC power source for supplying DC power to said oscillator, d. means for supplying liquid fuel to be atomized to an oscillating surface of said ultrasonic transducer, e. a DC power source providing two different output voltages, f. a switching circuit means for selecting one of said two output voltages of said DC power source, and g. a control circuit for controlling said switching circuit; B. an ignition electrode for igniting the atomized liquid fuel, C. a combustion chamber, D. a motor driven blower for discharging atomized liquid fuel, E. housing means surrounding an atomizing section including said ignition electrode and said motor-driven blower for causing air to flow along said atomizing section, F. photoelectric transducer means disposed within said housing means for providing a combustion signal in response to light emitted from the combustion flame in said combustion chamber, G. means for controlling the supply of liQuid fuel to be supplied to said ultrasonic transducer, and H. power supply control means connected to said DC power source, said ignition electrode, the motor for driving said blower and said liquid fuel supply control means for interrupting the operation of the apparatus connected thereto in response to an absence of the signal from said photoelectric transducer means.

Claim 14

An ultrasonic liquid fuel burner comprising A an ultrasonic generator comprising a. an ultrasonic transducer whose motional admittance is maximum at a resonant frequency, b. an oscillator comprising an amplifier adapted to drive said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency, and a feedback circuit for feeding back to said amplifier an AC voltage in proportion to the driving current which drives said ultrasonic transducer, c. A DC power source for supplying DC power to said oscillator, d. means for supplying liquid fuel to be atomized to an oscillating surface of said ultrasonic transducer, e. a DC power source providing two different output voltages, f. a switching circuit means for selecting one of said two output voltages of said DC power source, and g. a control circuit for controlling said switching circuit; B. an ignition electrode for igniting the atomized liquid fuel, C. a combustion chamber, D. a motor driven blower for discharging atomized liquid fuel, E. housing means surrounding an atomizing section including said ignition electrode and said motor-driven blower for causing air to flow along said atomizing section, F. photoelectric transducer means disposed within said housing means for providing a combustion signal in response to light emitted from the combustion flame in said combustion chamber, G. means for controlling the supply of liQuid fuel to be supplied to said ultrasonic transducer, and H. power supply control means connected to said DC power source, said ignition electrode, the motor for driving said blower and said liquid fuel supply control means for interrupting the operation of the apparatus connected thereto in response to an absence of the signal from said photoelectric transducer means.

Claim 15

An ultrasonic liquid fuel burner as defined in claim 11 further comrising means for detecting whether air is flowing through said housing means, said power supply control means being adapted to be actuated in response to the signals from said air flow detecting means.

Claim 16

An ultrasonic liquid fuel burner as defined in claim 11 further comprising means responsive to said driving current for controlling said liquid fuel supply control means.

Claim 17

An ultrasonic liquid fuel burner as defined in claim 11 further comprising timer means for delaying the operation of said DC power source and said motor of said blower.

Claim 18

An ultrasonic liquid fuel burner comprising A. an ultrasonic generator comprising a. an ultrasonic transducer whose motional admittance is maximum at a resonant frequency, b. an oscillator comprising an amplifier means for driving said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency whereby a surface of said transducer oscillates, and a feedback circuit for feeding back to said amplifier an AC voltage in proportion to the driving current which drives said ultrasonic transducer, c. A DC power source for supplying DC power to said oscillator, d. converter means for providing a DC voltage in proportion to said driving current, a control circuit connected to said converter means for controlling DC power source, and e. means for supplying liquid fuel to be atomized to the oscillating surface of said ultrasonic transducer; B. an ignition electrode for igniting atomized liquid fuel, C. a motor-driven blower for discharging atomized liquid fuel into a combustion chamber, D. housing means surrounding an atomizing section including said ultrasonic transducer, said liquid fuel supply means, said ignition electrode and said motor-driven blower for causing combustion air to blow along said atomizing section, E. photoelectric transducer means disposed within said housing means for providing a combustion signal in response to light emitted from the combustion flame in said combustion chamber, F. means for controlling the supply of liquid fuel to said ultrasonic transducer, and G. means for interrupting the operation of said DC power source, said ignition electrode, said motor-driven blower and said liquid fuel supply control means in response to an absence of said combustion signal.

Claim 19

An ultrasonic liquid fuel burner comprising A. an ultrasonic generator comprising a. an ultrasonic transducer whose motional admittance is maximum at a resonant frequency, b. an oscillator comprising an amplifier means for driving said ultrasonic transducer with a square waveform voltage at a frequency substantially equal to said resonant frequency whereby a surface of said transducer oscillates, and a feedback circuit for feeding back to said amplifier an AC voltage in proportion to the driving current which drives said ultrasonic transducer, c. A DC power source for supplying DC power to said oscillator, d. converter means for providing a DC voltage in proportion to said driving current, a control circuit connected to said converter means for controlling DC power source, and e. means for supplying liquid fuel to be atomized to the oscillating surface of said ultrasonic transducer; B. an ignition electrode for igniting atomized liquid fuel, C. a motor-driven blower for discharging atomized liquid fuel into a combustion chamber, D. housing means surrounding an atomizing section including said ultrasonic transducer, said liquid fuel supply means, said ignition electrode and said motor-driven blower for causing combustion air to blow along said atomizing section, E. photoelectric transducer means disposed within said housing means for providing a combustion signal in response to light emitted from the combustion flame in said combustion chamber, F. means for controlling the supply of liquid fuel to said ultrasonic transducer, and G. means for interrupting the operation of said DC power source, said ignition electrode, said motor-driven blower and said liquid fuel supply control means in response to an absence of said combustion signal.

Claim 20

An ultrasonic liquid fuel burner as defined in claim 15 further comprising means for detecting whether combustion air is flowing through said housing means, said interrupting means being adapted to be actuated in response to the signals from said air flow detecting means.

Claim 21

An ultrasonic liquid fuel burner as defined in claim 15 further comprising means for controlling said liquid fuel supply control means in response to said driving current.

Claim 22

An ultrasonic liquid fuel burner as defined in claim 15 further comprising timer means responsive to the interruption of power to said liquid fuel supply control means for initially delaying the interruption of power from said two-output DC power source to said motor-driven blower.

Claim 23

An ultrasonic liquid fuel burner as defined in claim 15 further comprising means for varying said DC voltage from said converter means in response to the temperature of liquid fuel to be atomized.

Claim 24

An ultrasonic liquid fuel burner as defined in claim 19 further comprising means for detecting whether combustion air is flowing through said housing means, and means for actuating said interrupting Means in response to the signals from said air flow detecting means.

Claim 25

An ultrasonic liquid fuel burner as defined in claim 19 further comprising means for controlling said liquid fuel supply control means in response to said driving current.

Claim 26

An ultrasonic liquid fuel burner as defined in claim 19 further comprising timer means responsive to the interruption of power to said liquid fuel supply control means for initially delaying the interruption of power from said two-output DC power source to said motor-driven blower.