CN2132573Y

CN2132573Y - Ultrasonic cleaning device

Info

Publication number: CN2132573Y
Application number: CN 92215846
Authority: CN
Inventors: 张镜澄; 凌鸿烈
Original assignee: DONGHAI RESEARCH STATION CHINE
Current assignee: DONGHAI RESEARCH STATION CHINE
Priority date: 1992-07-10
Filing date: 1992-07-10
Publication date: 1993-05-12
Anticipated expiration: 2002-07-10

Abstract

The utility model relates to an ultrasonic cleaning device, wherein, a frequency modulation ultrasonic generator is composed of a frequency modulated oscillation circuit improved by a monolithic integration pulse width modulator, a driving component, a VMOS pipe power amplifier component and a matching component. The frequency modulation ultrasonic generator is matched with an ultrasonic transducer and a rinse tank to conduct ultrasonic cleaning. The uniformity of sound field in cleaning liquid can be improved. A cleaning blind zone is eliminated, and cleaning effect is improved. Simultaneously, because an integrated pulse width modulator is adopted, one piece of a circuit can simultaneously complete a plurality of functions such as frequency modulation, dead zone time adjustment, soft start, over-current protection, etc. The circuit is concise and reliable, and the cost is low. Because an industrial frequency transformer is omitted, power weight ratio is improved by three times.

Description

Ultrasonic cleaning device

The utility model relates to a kind of applications of ultrasound device that is used for ultrasonic cleaning.

The present utility model people had once obtained Chinese utility model patent (applying date 890121, application number 89211389.8) with regard to " small-sized twin-tub ultrasonic cleaning machine ", abandoned in 91 annual proper motions again.

At present, the existing ultrasonic generator that comprises, the ultrasonic cleaning equipment of ultrasonic transducer and rinse bath adopts the work of single-frequency pattern more, there is the defective of two aspects in this mode of operation: one, under the single frequency operation situation, to form stationary field in the cleaning fluid, at sound pressure amplitudes node place, the acoustic pressure minimum, be lower than cavitation threshold, lose cleaning performance, promptly exist and clean the blind area; Two, when the liquid layer thickness of cleaning fluid is the integral multiple of the ultrasonic half-wavelength of transducer radiation, can be in cleaning fluid form " water layer resonance ", cause that liquid level trembles to beat, and influence the job stability of cleaning machine.

The purpose of this utility model is: provides a kind of and in rinse bath, can produce even sound field, eliminate and clean the blind area, improve cleaning performance, and the ultrasonic cleaning equipment of the frequency modulation of stable work in work.

The utility model is achieved in that it comprises ultrasonic generator, ultrasonic transducer and rinse bath; its ultrasonic generator constitutes modulating oscillation circuit by the voltage controlled oscillator 2 of sawtooth-voltage generator 1 and band holding circuit; be connected in series formation frequency modulation ultrasonic generator mutually with driver part, switch power amplifier unit 4 and matching block 5 again, wherein:

(1) voltage controlled oscillator 2 is improved by the integrated pulse width modulator of a monolithic " 3524 " and forms: " 3524 " 7 foot meridian capacitor C14 ground connection, 6 pin connect FET T12 drain electrode, the T12 source electrode ground connection of connecting with resistance R 17, potentiometer R18, its grid is connected to the saw-toothed wave generator output through C11, simultaneously through R16 ground connection;

(2) 1 of " 3524 ", 9 pin link to each other, the 16 pin ground connection of connecting with resistance R 19, R24 and potentiometer R20, and 2 pin connect potentiometer R20 center-side, constitute " dead band " regulating circuit of two square-wave voltages;

(3) the full-bridge type voltage switch type resonance power amplifier formed by four power field effect transistors (VMOS pipe) of switch power amplifier unit, specifically be connected to: T1, T3 source electrode link to each other with T2, T4 drain electrode respectively, and its two tie point links to each other with the elementary winding of output transformer Tr2 two ends respectively; T1, T3 two pipe drain electrodes link to each other, and meet power supply ED, and T2, T4 source electrode link to each other, through R7 ground connection.

Holding circuit in the said voltage controlled oscillator is the current foldback circuit of power tube: for controllable silicon Th2 negative electrode connects " 3524 " 4 pin, simultaneously through R25 ground connection; " 3524 " 5 pin ground connection; The Th2 anode meets low-tension supply Ec2 through resistance R 46; The Th2 control utmost point connects capacitor C 15 and voltage-stabiliser tube D18 positive pole; The D18 negative pole connects potentiometer R48 center-side; R48 is in parallel with capacitor C 19, is connected to the secondary windings two ends of current sample transformer Tr5 through R49.

Said power amplification parts also are provided with two kinds of holding circuits: be parallel with the amplitude limiter circuit of four diodes (D5-D8) composition and R8, the C7 resistance capaciting absorpting circuit in parallel with the elementary winding of output transformer with power tube.

Detailed circuit structure of the present utility model is described in detail by the embodiment accompanying drawing that provides.

Fig. 1 is the utility model outline drawing.

Fig. 2 is the utility model functional-block diagram.

Fig. 3 is the utility model circuitry structure chart.

Fig. 4 is the utility model FM circuit structure chart.

Fig. 5 is the utility model " dead band " regulating circuit structure chart.

Among Fig. 1, the output of ultrasonic generator is connect the transducer that places rinse bath by cable.

Among Fig. 2,1 is saw-toothed wave generator; 2 is voltage controlled oscillator; 3 is driver part; 4 is the switch power amplifier unit; 5 is matching block; 6,7,8 is soft start and holding circuit; form modulating oscillation circuit by sawtooth-voltage generator 1 and voltage controlled oscillator 2, it produces a frequency modulation square-wave voltage, delivers to close power amplifier parts 4 through drive circuit 3; relend and help matching block 5, provide specified electrical power output to be connected to ultrasonic transducer.Reliable for guaranteeing circuit working, be provided with soft start 6, through overvoltage, under-voltage protecting circuit 7, current foldback circuit 8.

The numbering of each frame of broken lines is corresponding with the numbering of Fig. 2 among Fig. 3.Saw-toothed wave generator 1 and voltage controlled oscillator 2 are formed modulating oscillation circuit.Adopt bridge switching circuit owing to consider the power amplifier level, and the turn-off time of power transistor is always greater than service time, so,, just require the two-way driving voltage of upper and lower pipe to have one period " common stand-down " (claiming " dead band " again) for preventing the conducting simultaneously of the upper and lower pipe of brachium pontis.

" voltage controlled oscillator " is among Fig. 3 shown in the frame of broken lines 2, and it has adopted the integrated pulse width modulator of monolithic " 3524 ", and it is opposite and the square-wave voltage of certain " dead band " time arranged to export the two-way phase place simultaneously from " 3524 " 12 pin and 13 pin.It comprises " dead band " regulating circuit and FM circuit two parts, provides detailed circuit diagram by Fig. 4 and Fig. 5 respectively.

Fig. 4 is the FM circuit structure chart, 7 foot meridian capacitor C14 ground connection by " 3524 ", 6 pin connect FET T12 drain electrode, the T12 source electrode ground connection of connecting with resistance R 17, potentiometer R18, and grid is connected to the output of saw-toothed wave generator through capacitor C 11, simultaneously through R16 ground connection, like this, can make " 3524 " to have frequency modulation function, promptly change the T12 grid voltage, just change the equivalent resistance of " 3524 " 6 pin, also promptly change the frequency of oscillation of " 3524 " to ground.R18 among the figure is used to regulate centre frequency.

Fig. 5 is " dead band " regulating circuit figure, and concrete the binding is: " 3524 " 9,1 pin links to each other, the 16 pin ground connection of connecting with resistance R 19, R24 and potentiometer R20, and 2 pin connect potentiometer R20 center-side, i.e. formation " dead band " regulating circuit.

Driver part be among Fig. 3 frame of broken lines 3. shown in.Because the power amplifier level adopts power field effect pipe, so driving power is minimum, but requires drive circuit that low internal resistance is arranged.So two groups of single-ended inputs are set push off drive circuit: NPN manage T5(T7) manage T6(T8 with PNP) emitter-base bandgap grading is connected to capacitor C 15(C16 after linking to each other), meet pulse transformer Tr3(Tr4 between the other end of electric capacity and the ground) elementary winding, secondary windings is received the grid of power field effect pipe T1-T4 through resistance R 29-R35.T5(T7) with T6(T8) base stage be connected to 12 pin (13 pin) of " 3524 ".

The power-amplifier stage parts are frame of broken lines 4 among Fig. 3, it forms full-bridge type voltage switch type resonance power amplifier unit by four power field effect pipes: T1, T3 source electrode link to each other with T2, T4 drain electrode respectively, and its two tie point links to each other with the elementary winding of output transformer Tr2 two ends respectively; T1, the T3 two drain electrodes power supply ED that is connected; T2, T4 two ends are extremely continuous, through R7 ground connection.

Matching block is Fig. 3 frame of broken lines 5, and it is composed in series by inductance L 1 and capacitor C 8.Capacitor C 8 is parallel way with the transducer that inserts output.

Soft starting circuit is Fig. 3 frame of broken lines 6, and it is in order to suppress the high-frequency output transformer start surge current of moment, and two kinds of start soft starting circuits that are provided with:

1. driving voltage soft starting circuit.1 pin in " 3524 " chip IC 2 connects a capacitor C 13 ground connection again, can realize that start rear drive pulse is by the narrow soft start function that broadens gradually by the chip internal circuit.

2. the high pressure soft starting circuit is a frame of broken lines 6 among Fig. 3, controllable silicon Th1 and filter resistance R3 parallel connection; Connecting resistance R4 between its anode and the control utmost point connects resistance R 1 and the capacitor C 2 that is in parallel between the negative electrode and the control utmost point.

The utility model power amplification power supply electric current is full-wave bridge rectifier circuit, without Industrial Frequency Transformer by the direct rectification of electrical network.Ultrasonic transducer connects the ultrasonic generator output through cable, and ultrasonic transducer places bottom of rinse bath.

The utility model has the advantage of: 1. owing to adopted frequency modulation technology, make transducer work Frequency is (about 1.5KHz) change within the specific limits, can improve the uniformity of sound field in the cleaning fluid, eliminates " cleaning blind area ", weakens " water layer resonance ", improves cleaning performance; 2. select higher operating frequency (about 40KHz), cavitation noise is obviously reduced, alleviated the noise pollution to operating personnel; 3. the power amplifier level adopts New Type Power Devices-power field effect pipe (VDMOS), the switching speed height, and transition loss is little, and drive circuit is simple. The power amplifier conversion efficiency is greater than 90%; 4. monolithic integrated pulse width modulation circuit is adopted in the frequency modulation on pulse source, through improving, makes it have the several functions such as frequency modulation, adjusting " dead band " time, soft start and overcurrent protection, like this, circuitry is greatly simplified, and has reduced cost, and reliable operation; 5. the power amplification power supply power supply saves Industrial Frequency Transformer, and complete machine weight is greatly alleviated, and improves 3 times of power-weight ratios; 6. because the utility model is to be the frequency modulation ultrasonic generator, the ultrasonic transducer frequency band that requirement is complementary with it is wider, selects so need not carry out strict uniformity to the parameter that forms each transducer in the rinse bath.

Claims

1, a kind of ultrasonic generator that comprises; the ultrasonic cleaning equipment of ultrasonic transducer and rinse bath; it is characterized in that: ultrasonic generator constitutes modulating oscillation circuit by the voltage controlled oscillator 2 of saw-toothed wave generator 1 and band holding circuit; be connected in series formation mutually with driver part 3, switch power amplifier unit 4 and matching block 5 again, wherein:

(1) voltage controlled oscillator 2 is to be improved by the integrated pulse width modulator of a monolithic " 3524 " to form: " 3524 " 7 foot meridian capacitor C14 ground connection, 6 pin connect FET T12 drain electrode, the T12 source electrode ground connection of connecting with resistance R 17, potentiometer R18, its grid is connected to the saw-toothed wave generator output through C11, simultaneously through R16 ground connection;

(3) the full-bridge type voltage switch type resonance power amplifier unit formed by four power field effect transistors (VMOS pipe) of switch power amplifying circuit, specifically be connected to: T1, T3 source electrode link to each other with T2, T4 drain electrode respectively, and its two tie point links to each other with the elementary winding of output transformer Tr2 two ends respectively; T1, T3 two pipe drain electrodes link to each other, and meet power supply ED, T2, the T4 source electrode links to each other, through R7 ground connection.

2, according to the said ultrasonic cleaning equipment of claim 1, it is characterized in that: the holding circuit in said " voltage controlled oscillator of band holding circuit " is: controllable silicon Th2 negative electrode connects " 3524 " 4 pin, simultaneously through R25 ground connection, and " 3524 " 5 pin ground connection; The Th2 anode meets low-tension supply Ec2 through resistance R 46; The Th2 control utmost point connects capacitor C 15 and voltage-stabiliser tube D18 positive pole; The D18 negative pole connects potentiometer R48 center-side; R48 is in parallel with capacitor C 19, is connected to the secondary windings two ends of current sample transformer Tr5 through R49.

3, according to the said ultrasonic cleaning equipment of claim 1, it is characterized in that: said power amplification circuit is provided with two kinds of holding circuits and is: be parallel with the amplitude limiter circuit that four diodes (D5-D8) are formed with power tube; With R8, the C7 resistance capaciting absorpting circuit in parallel with the elementary winding of output transformer.