CN216309204U - Self-sensing ultrasonic transducer and ultrasonic cavitation intensity monitoring device - Google Patents

Abstract

The utility model belongs to the technical field of ultrasonic cavitation, and particularly relates to a self-sensing ultrasonic transducer and an ultrasonic cavitation intensity monitoring device, wherein the self-sensing ultrasonic transducer comprises a rear matching electrode plate, a first input electrode plate, a second input electrode plate, a first output electrode plate, a second output electrode plate, a piezoelectric ceramic plate, a flange plate, a front matching electrode plate and an amplitude transformer; the rear matching part is fixedly connected with a first input electrode plate, a second input electrode plate, a first output electrode plate, a second output electrode plate and a flange plate in sequence, and piezoelectric ceramic plates are respectively arranged among the first input electrode plate, the second input electrode plate, the first output electrode plate, the second output electrode plate and the flange plate; the flange plate, the front matching and the amplitude transformer are fixedly connected in sequence. The ultrasonic cavitation intensity monitoring device can monitor the ultrasonic cavitation intensity in real time by utilizing the ultrasonic transducer which can work in a special environment under the condition of not increasing a measuring instrument.

Description

Self-sensing ultrasonic transducer and ultrasonic cavitation intensity monitoring device

Technical Field

The utility model relates to the field of ultrasonic liquid treatment, in particular to an integrated self-sensing ultrasonic transducer and a device for exciting a cavitation effect and monitoring ultrasonic cavitation intensity by using the same in a special and extreme environment.

Background

Ultrasonic cavitation is an important phenomenon of power ultrasound in liquid, and extreme physical conditions such as shock waves, micro-jet, local high temperature and high pressure and the like can be generated during cavitation, and biochemical effects are derived, so that the cavitation is widely applied to many fields such as chemical engineering, environment, medical treatment, materials and the like. In application, monitoring the cavitation intensity excited by the ultrasonic transducer in real time is an important link of related industrial production, and besides the working ultrasonic transducer, a measuring instrument needs to be additionally arranged to acquire data in real time. However, in some special environments, such as high temperature, high pressure and strong corrosive environments, the measuring instrument cannot work normally.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a self-sensing ultrasonic transducer which can be used for monitoring the cavitation intensity of ultrasonic waves in real time in a special environment by using an ultrasonic transducer which can work in the environment without adding a measuring instrument.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a self-sensing ultrasonic transducer comprises a rear matching electrode plate, a first input electrode plate, a second input electrode plate, a first output electrode plate, a second output electrode plate, a piezoelectric ceramic plate, a flange plate, a front matching and amplitude transformer;

the rear matching module is characterized in that a first input electrode plate, a second input electrode plate, a first output electrode plate, a second output electrode plate and a flange are sequentially connected and fixed, and piezoelectric ceramic plates are respectively arranged between the first input electrode plate and the second input electrode plate, between the second input electrode plate and the first output electrode plate, between the first output electrode plate and the second output electrode plate, between the second output electrode plate and the flange;

the flange plate, the front matching and the amplitude transformer are fixedly connected in sequence.

Preferably, the diameter of the horn at the front mating connection end is greater than the diameter at the other end.

Preferably, a groove is formed in the flange plate, and a sealing ring is arranged in the groove.

The utility model also provides an ultrasonic cavitation intensity monitoring device, which comprises: the system comprises an ultrasonic generator, a self-sensing ultrasonic transducer, a signal collector and a signal processor;

the ultrasonic generator is connected with the self-sensing ultrasonic transducer, the self-sensing ultrasonic transducer is connected with the signal collector, and the signal collector is connected with the signal processor.

Preferably, the signal collector is a general oscilloscope.

In the utility model, four electrode plates are arranged on the ultrasonic transducer, wherein two electrode plates are used as the input of an electric signal, and the other two electrode plates are used as the output of the electric signal; the ultrasonic transducer converts the electric signal input from the electrode plate into ultrasonic waves to generate an ultrasonic cavitation effect, and cavitation noise of the ultrasonic cavitation effect is converted into the electric signal by the piezoelectric ceramic plate of the ultrasonic transducer and is output to the signal collector from the electrode plate.

In the utility model, the self-sensing ultrasonic transducer is placed in a special environment (high temperature, high pressure and strong corrosivity) needing to excite the cavitation effect to normally work, and ultrasonic cavitation is excited; the ultrasonic transducer is used for receiving vibration signals of ultrasonic cavitation radiation, converting the vibration signals into electric signals and outputting the electric signals to the signal collector, and the signal collector filters and amplifies the electric signals and inputs the electric signals into the signal processor to obtain the ultrasonic cavitation intensity.

Drawings

FIG. 1 is a schematic structural diagram of a self-sensing ultrasonic transducer of the present invention;

FIG. 2 is a schematic structural diagram of an ultrasonic cavitation intensity monitoring device according to the present invention;

FIG. 3 is a flow chart of a method in accordance with the present invention;

reference numerals:

1. post matching; 2. a first input electrode pad; 3. a second input electrode pad; 4. a first output electrode sheet; 5. a second output electrode sheet; 6. piezoelectric ceramic plates; 7. a flange plate; 8. a bolt; 9. pre-matching; 10. carrying out top thread; 11. a horn.

Detailed Description

The utility model is described in further detail below with reference to the figures and the detailed description.

Example 1

As shown in fig. 1, a self-sensing ultrasonic transducer comprises a rear matching 1, a first input electrode plate 2, a second input electrode plate 3, a first output electrode plate 4, a second output electrode plate 5, a piezoelectric ceramic plate 6, a flange 7, a front matching 9 and an amplitude transformer 11;

the rear matching 1, the first input electrode plate 2, the second input electrode plate 3, the first output electrode plate 4, the second output electrode plate 5 and the flange 7 are sequentially connected and fixed through bolts 8, and piezoelectric ceramic plates 6 are respectively arranged between the first input electrode plate 2 and the second input electrode plate 3, between the second input electrode plate 3 and the first output electrode plate 4, between the first output electrode plate 4 and the second output electrode plate 5 and between the second output electrode plate 5 and the flange 7;

the flange plate 7, the front matching 9 and the amplitude transformer 11 are fixedly connected in sequence. The flange plate 7 and the front matching 9 are of an integrated structure, and the front matching 9 is fixedly connected with the amplitude transformer 11 through a jackscrew 10.

The diameter of the connecting end of the amplitude transformer 1 and the front matching 9 is larger than that of the other end.

The flange 7 is provided with a groove, and a sealing ring is arranged in the groove.

In this embodiment, the post-matching material is stainless steel, the electrode plates are made of copper, and the electrode plates are four in total and are sequentially connected to the negative electrode and the positive electrode of the output end of the ultrasonic generator and the negative electrode and the positive electrode of the input end of the signal collector from top to bottom. The piezoelectric ceramic sheet is made of PZT 8; the flange plate is used for fixing the transducer, grooves are formed in the upper surface and the lower surface of the flange plate, and O rings are placed to play a role in sealing and vibration isolation. The manufacturing materials matched with the flange are all duralumin and are integrally manufactured with the flange. The bolt is used for applying prestress to prevent the piezoelectric ceramic piece from cracking due to overlarge tension. The jackscrew is used for matching and amplitude transformer before connecting the transducer. The amplitude transformer is in direct contact with a medium to be processed and is used for amplifying the output displacement amplitude of the transducer to locally form high sound intensity, the material is titanium alloy, and specific material selection can be carried out according to the physical and chemical properties of the inserted liquid.

Example 2

As shown in fig. 2, an ultrasonic cavitation intensity monitoring device comprises: the system comprises an ultrasonic generator, a self-sensing ultrasonic transducer, a signal collector and a signal processor;

the ultrasonic generator is connected with the self-sensing ultrasonic transducer, the self-sensing ultrasonic transducer is connected with the signal collector, and the signal collector is connected with the signal processor.

In the embodiment, the model of the ultrasonic generator (with the matching box) is a UGD ultrasonic generator manufactured by acoustic research of Chinese academy of sciences; the signal collector (with a built-in collecting circuit) can be completed by a general oscilloscope (for example, the model is ROHDE & SCHWARZ RTM 3004); the signal processor is a computer.

As shown in fig. 3, the monitoring method of the device for monitoring ultrasonic cavitation intensity includes the following steps:

1) the self-sensing ultrasonic transducer is inserted into liquid to be processed to generate ultrasonic cavitation, and cavitation noise is generated along with the ultrasonic cavitation;

2) the ultrasonic transducer is used for receiving vibration signals radiated by ultrasonic cavitation noise, and then electric signals generated by the vibration signals are extracted by the signal collector for filtering and amplifying;

3) the signal processor obtains a time domain signal p (t) of cavitation noise by using the electric signal; and performing Fast Fourier Transform (FFT) on the time domain signal p (t) to obtain a frequency domain signal p (f), wherein the FFT formula is shown in formula (1).

Where N is the time-domain sampling length, Δ t is the signal sampling interval, N is t/Δ t is the number of time points, f is the signal frequency, f is the time-domain sampling interval, N is the time-domain sampling interval, f is the signal frequency, f is the time-domain sampling interval, N is the time-domain sampling interval, f is the signal frequency, f is the time-domain sampling interval, and f is the time-domain sampling interval_sIs the signal sampling frequency; e is a natural constant, j is an imaginary unit, all of which are known constants and can be used directly.

4) White noise and environmental noise in the frequency domain signal P (f) are filtered to obtain a frequency spectrum P only containing ultrasonic cavitation noise₁(f)。

5) The ultrasonic cavitation noise spectrum is utilized, and the cavitation intensity is obtained by integrating the sound pressure in the frequency domain

Wherein f is₀The maximum frequency of the effective ultrasonic cavitation noise frequency spectrum can be predicted through the actual working condition and then is used as a known quantity to be input into a formula.

p (t) represents the sound pressure received by the circuit, which is actually a series of digital signals, where (t) represents the time as the argument of the signal. The unit of p (t) can be Ford or converted into Pascal, and since the cavitation is judged whether to be stably carried out or not through the relative change of data in the actual operation, the absolute numerical value of the cavitation is not needed, the unit of the data and the numerical value of the cavitation intensity are not calibrated.

The expression of the signal and the formula for summing the FFT are general expressions accepted in the art and the present invention will not be described in detail.

Conventional technical knowledge in the art can be used for the details which are not described in the present invention.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (5)

1. A self-sensing ultrasonic transducer is characterized by comprising a rear matching electrode plate, a first input electrode plate, a second input electrode plate, a first output electrode plate, a second output electrode plate, a piezoelectric ceramic plate, a flange plate, a front matching and amplitude transformer;

the rear matching module is characterized in that a first input electrode plate, a second input electrode plate, a first output electrode plate, a second output electrode plate and a flange are sequentially connected and fixed, and piezoelectric ceramic plates are respectively arranged between the first input electrode plate and the second input electrode plate, between the second input electrode plate and the first output electrode plate, between the first output electrode plate and the second output electrode plate, between the second output electrode plate and the flange;

the flange plate, the front matching and the amplitude transformer are fixedly connected in sequence.

2. The self-sensing ultrasonic transducer of claim 1, wherein the horn has a larger diameter at the front mating end than at the other end.

3. The self-sensing ultrasonic transducer of claim 1, wherein the flange has a groove therein, and a sealing ring is disposed in the groove.

4. An ultrasonic cavitation intensity monitoring device, the monitoring device comprising: an ultrasound generator, the self-sensing ultrasound transducer of any of claims 1-3, a signal collector, and a signal processor;

the ultrasonic generator is connected with the self-sensing ultrasonic transducer, the self-sensing ultrasonic transducer is connected with the signal collector, and the signal collector is connected with the signal processor.

5. The ultrasonic cavitation intensity monitoring device according to claim 4, characterized in that the signal collector is a general oscilloscope.

Images