CN205701677U - Combination frequency ultrasonic cleaning equipment - Google Patents

Abstract

The utility model relates to the field of home appliance cleaning equipment, in particular to a composite frequency ultrasonic cleaning device, which includes: a processor, a first push-pull circuit to a third push-pull circuit, a first piezoelectric ceramic sheet to a third piezoelectric ceramic sheet; The processor is respectively connected to the first piezoelectric ceramic sheet through the first push-pull circuit, connected to the second piezoelectric ceramic sheet through the second push-pull circuit, and connected to the third piezoelectric ceramic sheet through the third push-pull circuit. The above composite frequency ultrasonic cleaning device, through the processor, generates three ultrasonic waves of different frequencies that do not interfere with each other, and the ultrasonic waves of the first frequency, the ultrasonic waves of the second frequency and the ultrasonic waves of the third frequency overlap each other, so that the maximum energy between the three can be achieved. Compensate each other's troughs with their respective peaks to the maximum to avoid standing waves, thereby improving cleaning efficiency and cleaning effect, and the use of piezoelectric ceramics can effectively reduce the volume of the product.

Description

Multi-frequency ultrasonic cleaning device

technical field

The utility model relates to the field of household appliance cleaning equipment, in particular to a composite frequency ultrasonic cleaning device.

Background technique

Ultrasound (Ultrasound) refers to any sound wave or vibration whose frequency exceeds the highest threshold of 20kHz that can be heard by the human ear. Ultrasonic is widely used in many fields due to its high-frequency characteristics, such as metal flaw detection, workpiece cleaning, etc. According to the power, it can be divided into power ultrasonic and detection ultrasonic.

Cleaning principle of power ultrasonic waves: Ultrasonic waves propagating in liquids can clean the dirt on the surface of objects, and the principle can be explained by the phenomenon of "cavitation". The cleaning effect is closely related to the intensity of "cavitation" generated by ultrasonic waves in the liquid.

Ultrasound propagates in the liquid through vibration. When the sound wave pressure reaches an atmospheric pressure, the power density of the ultrasonic wave is about 0.35W/cm. At this time, the peak value of the sound wave pressure of the ultrasonic wave propagating in the liquid can easily reach vacuum or negative pressure; but In fact, there is no negative pressure phenomenon, so a great force is generated in the liquid, which splits the liquid molecules into cavities (cavitation nuclei), which are vacuum or very close to vacuum.

In addition, when the signal voltage (or ultrasonic pressure) value reaches the maximum in the next half cycle, the cavity is crushed due to the increase of the surrounding pressure. At this time, the violent collision of liquid molecules produces a very strong impact force, which will clean the surface of the object. Dirt hits down.

The phenomenon of shock waves generated when these countless small and dense bubbles collapse is called "cavitation". This kind of cavitation is very easy to produce at the junction of solid and liquid, so it has an extraordinary cleaning effect on objects immersed in liquid under the action of ultrasound.

In addition, because ultrasonic waves have a strong penetrating effect on solids, they can penetrate to the surface of the other side of the object to be cleaned, as well as all inner cavities, blind holes, and slits immersed in the medium, and the dirt attached to the surface of the object to be cleaned will Peel off for better cleaning results.

At the same time, ultrasonic waves also have the effect of emulsification and neutralization, which can more effectively prevent the cleaned oil from reattaching to the cleaned object. Therefore, this "cavitation" effect can clean the inner and outer surfaces of objects immersed in the liquid under the action of ultrasonic waves, such as pipe fittings, box parts, etc., which is an important aspect that ultrasonic cleaning is superior to other cleaning methods.

At present, the main component of ultrasonic cleaning equipment on the market is the ultrasonic vibrator glued to the bottom of the cleaning container, which generates ultrasonic vibrations with a fixed frequency under the action of the drive circuit, and the ultrasonic waves propagating in water generate cavitation vacuum bubbles to clean objects. Clean the surface.

However, existing ultrasonic cleaning equipment often has the following defects:

1. Single fixed frequency, fixed vibration frequency of the transducer, insufficient cavitation and easy to form standing waves, resulting in poor cleaning effect.

2. The ultrasonic transducer with large volume and high power is adopted, and the transformer adopts a magnetic core skeleton structure, which affects the entire ultrasonic cleaning equipment and makes its volume too large.

3. The cleaning efficiency is low, and it is difficult to maintain the same cleaning efficiency in different water depths.

Utility model content

Based on this, it is necessary to provide a multi-frequency ultrasonic cleaning device for how to improve cleaning efficiency and cleaning effect and how to reduce product volume.

A composite frequency ultrasonic cleaning device, comprising: a processor, a first push-pull circuit to a third push-pull circuit, a first piezoelectric ceramic sheet to a third piezoelectric ceramic sheet;

The processor is respectively connected to the first piezoelectric ceramic sheet through the first push-pull circuit, connected to the second piezoelectric ceramic sheet through the second push-pull circuit, and connected to the second piezoelectric ceramic sheet through the third push-pull circuit. A circuit is connected to the third piezoelectric ceramic sheet;

The first piezoelectric ceramic sheet is used to generate ultrasonic waves of a first frequency, the second piezoelectric ceramic sheet is used to generate ultrasonic waves of a second frequency, and the third piezoelectric ceramic sheet is used to generate ultrasonic waves of a third frequency .

In one of the embodiments, it also includes a first feedback circuit to a third feedback circuit;

The processor is respectively connected to the first piezoelectric ceramic sheet through the first feedback circuit, connected to the second piezoelectric ceramic sheet through the second feedback circuit, and connected to the second piezoelectric ceramic sheet through the third feedback circuit. The third piezoelectric ceramic sheet is connected;

The processor adjusts the power of the ultrasonic waves of the first frequency according to the first feedback circuit, adjusts the power of the ultrasonic waves of the second frequency according to the second feedback circuit, and adjusts the power of the ultrasonic waves of the second frequency according to the third feedback circuit. The power of the ultrasonic wave of the third frequency.

In one of the embodiments, a rectification circuit is also included, and the output ends of the rectification circuit are respectively connected to the processor, the first push-pull circuit, the second push-pull circuit, and the third push-pull circuit .

In one of the embodiments, the first push-pull circuit includes a first totem pole circuit, a second totem pole circuit, a first MOS transistor, a second MOS transistor and a first transformer;

The first totem pole circuit is respectively connected to the processor and the first MOS transistor, and the second totem pole circuit is respectively connected to the processor and the second MOS transistor;

The first MOS transistor is connected to the DC input end of the first transformer, the second MOS transistor is connected to the other DC input end of the first transformer, and the first transformer is also connected to the first voltage transformer. Electroceramic connection.

In one of the embodiments, the first transformer includes two DC input terminals, an AC input terminal and two AC output terminals,

The first MOS transistor is connected to one of the DC input terminals, the second MOS transistor is connected to the other DC input terminal, and the AC input terminal is used to connect to an external AC power,

The first piezoelectric ceramic sheet forms a loop with the two AC output ends.

In one embodiment, a first inductor is connected in series between the first piezoelectric ceramic sheet and the two AC output terminals.

In one of the embodiments, it also includes a body, the body is provided with a groove and an installation cavity, the groove is used to accommodate liquid water,

The processor, the first push-pull circuit to the third push-pull circuit, the first piezoelectric ceramic sheet to the third piezoelectric ceramic sheet are arranged in the installation cavity.

In one embodiment, the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet and the third piezoelectric ceramic sheet are evenly distributed and abut against the bottom of the groove.

In one of the embodiments, the body is a hollow cylindrical structure with one side open.

In one of the embodiments, the body is a hollow cube with one side open.

The above composite frequency ultrasonic cleaning device, through the processor, generates three ultrasonic waves of different frequencies that do not interfere with each other, and the ultrasonic waves of the first frequency, the ultrasonic waves of the second frequency and the ultrasonic waves of the third frequency overlap each other, so that the maximum energy between the three can be achieved. Compensate each other's troughs with their respective peaks to the maximum to avoid standing waves, thereby improving cleaning efficiency and cleaning effect, and the use of piezoelectric ceramics can effectively reduce the volume of the product.

Description of drawings

Fig. 1 is a schematic structural view of a composite frequency ultrasonic cleaning device according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the individual waveforms of ultrasonic waves of the first frequency, the second frequency and the third frequency and a schematic diagram of the overlapping waveforms of the three in an embodiment of the present invention;

Fig. 3 is a structural schematic diagram of a composite frequency ultrasonic cleaning device according to another embodiment of the present invention;

Fig. 4 is a schematic diagram of the circuit structure of a composite frequency ultrasonic cleaning device according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a composite frequency ultrasonic cleaning device according to another embodiment of the present invention.

detailed description

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a full understanding of the present invention. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below limit.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Please refer to Fig. 1, which is a schematic structural view of a composite frequency ultrasonic cleaning device according to an embodiment of the present invention. The composite frequency ultrasonic cleaning device 10 includes: a processor 100, a first push-pull circuit 210, a second push-pull circuit 220, a third The push-pull circuit 230 , the first piezoelectric ceramic sheet 310 , the second piezoelectric ceramic sheet 320 , and the third piezoelectric ceramic sheet 330 .

The processor 100 is respectively connected to the first piezoelectric ceramic sheet 310 through the first push-pull circuit 210, connected to the second piezoelectric ceramic sheet 320 through the second push-pull circuit 220, and connected to the third piezoelectric ceramic sheet 320 through the third push-pull circuit 230. The ceramic sheet 330 is connected.

The first piezoelectric ceramic sheet 310 is used to generate ultrasonic waves of a first frequency, the second piezoelectric ceramic sheet 320 is used to generate ultrasonic waves of a second frequency, and the third piezoelectric ceramic sheet 330 is used to generate ultrasonic waves of a third frequency.

The ultrasonic waves of the first frequency, the ultrasonic waves of the second frequency and the ultrasonic waves of the third frequency overlap each other, and the peaks of the ultrasonic waves of the second frequency are different from the peaks of the ultrasonic waves of the third frequency, and are located at the adjacent two sides of the ultrasonic waves of the first frequency. between crests.

The processor generates three ultrasonic waves of different frequencies that do not interfere with each other, and the ultrasonic waves of the first frequency, the second frequency and the third frequency overlap each other, so that the three can be compensated by their respective peaks to the maximum extent. The trough of the other side avoids the standing wave phenomenon, thereby improving the cleaning efficiency and cleaning effect, and the use of piezoelectric ceramics can effectively reduce the product volume.

It should be noted that the ultrasonic waves used for cleaning in the present invention are high-power ultrasonic waves, which only need to be transmitted and do not need to receive echoes.

To generate high-precision PWM (pulse width modulation) waveforms, for example, the processor 100 is a pulse width modulation generation control chip. In this way, the chip is controlled by pulse width modulation to generate a variety of high-precision ultrasonic frequencies.

Please refer to Fig. 2, which is a schematic diagram of the waveforms of the first frequency, the second frequency and the third frequency of the ultrasonic waves in an embodiment of the present invention and a schematic diagram of the overlapping waveforms of the three. It can be seen that the ultrasonic waves with a frequency of 25K to 28KHz have cavitation strength High, strong cleaning ability and so on.

Combined with the center-of-gravity frequency of mainstream ultrasonic vibrators in the market, in this embodiment, the first ultrasonic frequency f1 adopts 26KHz, that is, when the processor simulates the 26KHz main frequency sound wave propagating in the liquid medium, a standing wave waveform is formed in the depth direction.

It should be pointed out that the peak represents the maximum sound pressure amplitude, that is, the strongest cavitation; and the trough represents the minimum sound pressure amplitude, that is, the weakest cavitation. When a single ultrasonic frequency is used for cleaning, the workpiece to be cleaned at the trough cannot be effectively cleaned.

Therefore, under the condition that the horizontal distance between the peak of the main frequency sound wave and the trough remains unchanged, that is, the amplitude of the sound wave remains unchanged, the processor generates ultrasonic waves of the second frequency and the third frequency, and the first frequency, the second frequency The ultrasonic waves of the frequency and the third frequency are superimposed together, so that the three can compensate each other's troughs with their respective peaks to the greatest extent.

In this way, after the three frequencies are mixed together through software simulation, there is almost no standing wave phenomenon, which greatly uniforms the uniformity of the ultrasonic sound field distribution in the medium, and improves the cleaning efficiency and cleaning effect.

Please refer to FIG. 3 , which is a schematic structural diagram of a composite frequency ultrasonic cleaning device 20 in another embodiment of the present invention. In this embodiment, the composite frequency ultrasonic cleaning device 20 also includes a first feedback circuit 410, a second feedback circuit 420 and a first feedback circuit 420. Three feedback circuits 430 .

The processor 100 is respectively connected to the first piezoelectric ceramic sheet 310 through the first feedback circuit 410, connected to the second piezoelectric ceramic sheet 320 through the second feedback circuit 420, and connected to the third piezoelectric ceramic sheet 330 through the third feedback circuit 430. connect.

The processor 100 adjusts the power of the ultrasonic waves of the first frequency according to the first feedback circuit 410 , adjusts the power of the ultrasonic waves of the second frequency according to the second feedback circuit 420 , and adjusts the power of the ultrasonic waves of the third frequency according to the third feedback circuit 430 .

It can be understood that the PWM duty cycle of traditional ultrasonic circuits is a fixed value. In ultrasonic cleaning, the depth of water has an impact on the load current of the ultrasonic cleaning device, that is, the deeper the water, the greater the load. Therefore, while maintaining the same cavitation and cleaning efficiency, the required load current is larger.

In this embodiment, the load current is sampled, and the processor adjusts the duty cycle of the PWM according to the feedback of each feedback circuit, thereby realizing the adjustment of the load current, so that the cleaning device can generate stable power in various situations. ultrasound.

For the convenience of power supply, the multi-frequency ultrasonic cleaning device also includes a rectifier circuit. The input end of the rectification circuit is connected with external alternating current. Output terminals of the rectification circuit are respectively connected to the processor 100 , the first push-pull circuit 210 , the second push-pull circuit 220 and the third push-pull circuit 230 .

In this way, the processor 100, the first push-pull circuit 210, the second push-pull circuit 220, and the third push-pull circuit 230 are powered by the rectifier circuit, which improves the working stability of the ultrasonic cleaning device.

In this embodiment, through the control of the control processor 100, the first piezoelectric ceramic sheet generates ultrasonic waves with a first frequency of 26KHz, the second piezoelectric ceramic sheet generates ultrasonic waves with a second frequency of 47KHz, and the third piezoelectric ceramic sheet generates ultrasonic waves with a first frequency of 26KHz. Ultrasonic waves with a third frequency of 88KHz.

Please refer to Fig. 4, which is a schematic diagram of the circuit structure of a composite frequency ultrasonic cleaning device according to an embodiment of the present invention. The first push-pull circuit 210 includes a first totem pole circuit 211, a second totem pole circuit 212, a first MOS transistor M11, The second MOS transistor M12 and the first transformer T1.

The first totem pole circuit 211 is respectively connected to the processor 100 and the first MOS transistor M11, and the second totem pole circuit 212 is respectively connected to the processor 100 and the second MOS transistor M12.

The first MOS transistor M11 is connected to the DC input end of the first transformer T1 , the second MOS transistor M12 is connected to the other DC input end of the first transformer T1 , and the first transformer T1 is also connected to the first piezoelectric ceramic chip 310 .

As shown in FIG. 4 , specifically in this embodiment, the first totem pole circuit 211 includes NPN transistors Q11 and Q13 and PNP transistors Q12 and Q14 . The bases of Q11 and Q12 are connected and connected with the processor, and the emitter of Q11 is connected with the emitter of Q12 and connected with the G electrode of M11. The collector of Q11 is connected to 12V DC power supply. The collector of Q12 is grounded.

The bases of Q13 and Q14 are connected and connected with the processor, and the emitter of Q13 is connected with the emitter of Q14 and connected with the G electrode of M12. The collector of Q13 is connected to 12V DC power supply. The collector of Q14 is grounded.

The D pole of M11 is connected to the first transformer T1, and the S pole is grounded. The D pole of M12 is connected to the first transformer T1, and the S pole is grounded. The first transformer T1 is also connected to the external live line L.

Specifically in this embodiment, the first transformer T1 includes two DC input terminals, an AC input terminal and two AC output terminals, the first MOS transistor M11 is connected to one DC input terminal, and the second MOS transistor M12 is connected to the other DC input terminal. , the AC input terminal is used to connect external AC power. The first piezoelectric ceramic sheet 310 forms a loop with the two AC output ends. In one embodiment, a first inductor L11 is connected in series between the first piezoelectric ceramic sheet 310 and the two AC output terminals.

It should be noted that, since the circuit structure of the second push-pull circuit 220 and the third push-pull circuit 230 is similar to the circuit structure of the first push-pull circuit 210, the circuits of the second push-pull circuit 220 and the third push-pull circuit 230 The specific connection relationship can refer to FIG. 4 , which will not be repeated here.

Please refer to FIG. 5 , which is a schematic structural diagram of a composite frequency ultrasonic cleaning device according to another embodiment of the present invention. The composite frequency ultrasonic cleaning device also includes a body 400 . For example, the body 400 is provided with a groove 410 and an installation cavity 420 . In this embodiment, the groove 410 accommodates liquid water 50 .

The processor 100 , the first push-pull circuit 210 to the third push-pull circuit 230 , and the first piezoelectric ceramic sheet 310 to the third piezoelectric ceramic sheet 330 are disposed in the installation cavity 420 .

The first piezoelectric ceramic sheet 310 , the second piezoelectric ceramic sheet 320 and the third piezoelectric ceramic sheet 330 are evenly distributed and abut against the bottom of the groove 410 . In one embodiment, the body 400 is a hollow cylindrical structure with one side open. In one embodiment, the body 400 is a hollow cube with one side open.

Take a specific cleaning process as an example below to further illustrate the utility model:

First, the groove is filled with an appropriate amount of water, and the household electrical equipment to be cleaned is placed in the groove. Preferably, the part of the household electrical equipment to be cleaned is completely immersed in liquid water.

Then, turn on the power supply and start the processor so that the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet and the third piezoelectric ceramic sheet respectively generate three ultrasonic waves of different frequencies that do not interfere with each other to clean the household appliances.

Finally, after the preset power-on time is exceeded, the power supply is disconnected, the household appliances are taken out, and the cleaning is completed.

The utility model has the advantages that: the processor generates three ultrasonic waves of different frequencies that do not interfere with each other, and the ultrasonic waves of the first frequency, the ultrasonic waves of the second frequency and the ultrasonic waves of the third frequency overlap each other, so that the maximum energy among the three can be achieved. Compensate each other's troughs with their respective peaks to the maximum to avoid standing waves, thereby improving cleaning efficiency and cleaning effect, and the use of piezoelectric ceramics can effectively reduce the volume of the product.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. A composite frequency ultrasonic cleaning device, characterized in that, comprising: a processor, a first push-pull circuit to a third push-pull circuit, a first piezoelectric ceramic sheet to a third piezoelectric ceramic sheet; The processor is respectively connected to the first piezoelectric ceramic sheet through the first push-pull circuit, connected to the second piezoelectric ceramic sheet through the second push-pull circuit, and connected to the second piezoelectric ceramic sheet through the third push-pull circuit. A circuit is connected to the third piezoelectric ceramic sheet; The first piezoelectric ceramic sheet is used to generate ultrasonic waves of a first frequency, the second piezoelectric ceramic sheet is used to generate ultrasonic waves of a second frequency, and the third piezoelectric ceramic sheet is used to generate ultrasonic waves of a third frequency . 2. composite frequency ultrasonic cleaning device according to claim 1, is characterized in that, also comprises first feedback circuit to the 3rd feedback circuit; The processor is respectively connected to the first piezoelectric ceramic sheet through the first feedback circuit, connected to the second piezoelectric ceramic sheet through the second feedback circuit, and connected to the second piezoelectric ceramic sheet through the third feedback circuit. The third piezoelectric ceramic sheet is connected; The processor adjusts the power of the ultrasonic waves of the first frequency according to the first feedback circuit, adjusts the power of the ultrasonic waves of the second frequency according to the second feedback circuit, and adjusts the power of the ultrasonic waves of the second frequency according to the third feedback circuit. The power of the ultrasonic waves of the third frequency. 3. composite frequency ultrasonic cleaning device according to claim 2, is characterized in that, also comprises rectification circuit, and the output terminal of described rectification circuit is connected with described processor, described first push-pull circuit, described second respectively. The push-pull circuit is connected to the third push-pull circuit. 4. The composite frequency ultrasonic cleaning device according to claim 3, wherein the first push-pull circuit comprises a first totem pole circuit, a second totem pole circuit, a first MOS tube, a second MOS tube and a first a transformer; The first totem pole circuit is respectively connected to the processor and the first MOS transistor, and the second totem pole circuit is respectively connected to the processor and the second MOS transistor; The first MOS transistor is connected to the DC input end of the first transformer, the second MOS transistor is connected to the other DC input end of the first transformer, and the first transformer is also connected to the first voltage transformer. Electroceramic connection. 5. composite frequency ultrasonic cleaning device according to claim 4, is characterized in that, described first transformer comprises two DC input terminals, AC input terminal and two AC output terminals, The first MOS transistor is connected to one of the DC input terminals, the second MOS transistor is connected to the other DC input terminal, and the AC input terminal is used to connect to an external AC power, The first piezoelectric ceramic sheet forms a loop with the two AC output terminals. 6 . The composite frequency ultrasonic cleaning device according to claim 5 , wherein a first inductor is connected in series between the first piezoelectric ceramic sheet and the two AC output terminals. 7. The composite frequency ultrasonic cleaning device according to claim 1, further comprising a body, the body is provided with a groove and an installation cavity, and the groove is used to accommodate liquid water, The processor, the first push-pull circuit to the third push-pull circuit, the first piezoelectric ceramic sheet to the third piezoelectric ceramic sheet are arranged in the installation cavity. 8. The composite frequency ultrasonic cleaning device according to claim 7, wherein the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet and the third piezoelectric ceramic sheet are evenly distributed and abut against each other. the bottom of the groove. 9. The composite frequency ultrasonic cleaning device according to claim 7, wherein the body is a hollow cylinder structure with one side open. 10 . The composite frequency ultrasonic cleaning device according to claim 7 , wherein the body is a cube structure with a hollow side and an opening. 11 .