High-precision intelligent liquid level meter

Abstract

The application relates to a high-precision intelligent liquid level meter, which comprises a liquid level meter body and a float, the liquid level meter body is installed above a container, and the float floats on a liquid surface; the liquid level meter body comprises a first ultrasonic transmitter, a second ultrasonic transmitter and an ultrasonic receiver; the float comprises a float tank, a resonant sheet is arranged at the opening of the upper end of the float tank, the resonant sheet is at least partially in contact with the liquid, and the resonant sheet generates resonance under the action of the second ultrasonic transmitter to perform defoaming treatment on the liquid. The float with the resonant sheet is placed on the liquid surface, low-frequency ultrasonic signals are emitted by the second ultrasonic transmitter to cause vibration of the resonant sheet, elimination of the liquid surface foam is realized, and the detection precision of the ultrasonic liquid level meter is prevented from being affected by the foam; high-frequency ultrasonic signals emitted by the first ultrasonic transmitter are used for detecting the liquid surface, so that the resolution and the measurement precision of the liquid level detection are improved by using the high-frequency ultrasonic waves, and the detection precision of the liquid level meter is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of intelligent sensors, in particular to a high-precision intelligent liquid level meter. BACKGROUND

[0002] The ultrasonic liquid level meter is a digital liquid level instrument controlled by a microprocessor. In measurement, ultrasonic pulses are emitted by a transducer, and the sound waves are reflected by the liquid surface and received by an ultrasonic receiver. The distance from the sensor to the surface of the measured liquid is calculated by the time difference between the emission and reception of the sound waves. Because of the non-contact measurement, the ultrasonic liquid level meter can be widely used for measuring the height of various liquids and solid materials.

[0003] However, the ultrasonic liquid level meter is easily affected by foam during measurement, which causes distortion of the echo signal or generates false signals, affecting the accuracy of liquid level detection, and seriously affecting the safe and stable operation of the whole system.

[0004] Based on the above technical problems, the application provides a high-precision intelligent liquid level meter. SUMMARY

[0005] The application aims to provide a high-precision intelligent liquid level meter to solve the technical problems mentioned in the background, and the application is achieved by the following technical scheme:

[0006] The high-precision intelligent liquid level meter comprises a liquid level meter body and a float, the liquid level meter body is installed above a container, and the float floats on the liquid surface; the liquid level meter body comprises a first ultrasonic emitter, a second ultrasonic emitter and an ultrasonic receiver, the first ultrasonic emitter and the second ultrasonic emitter are used for emitting ultrasonic signals to the liquid surface, the first ultrasonic emitter and the second ultrasonic emitter are started intermittently in an interlaced manner, and the ultrasonic receiver is used for receiving the ultrasonic signals emitted by the first ultrasonic emitter and reflected from the liquid surface; the float comprises a float tank, an opening is arranged at the upper end of the float tank, a resonant sheet is arranged at the opening, the resonant sheet and the float tank form a closed structure, the resonant sheet is at least partially in contact with the liquid, the natural frequency of the resonant sheet is equal to the frequency of the ultrasonic signals emitted by the second ultrasonic emitter, and the resonant sheet generates resonance under the action of the second ultrasonic emitter to perform defoaming treatment on the liquid.

[0007] Further, a probe is arranged at the outer circle of the resonant sheet, and the tip of the probe is bent downward to extend into the liquid.

[0008] Further, the probes are unevenly distributed at the outer circle of the resonant sheet.

[0009] Further, a support is arranged in the float tank, a nut is arranged on the support, the nut is located on the central axis of the float tank, a screw rod is screwed on the nut, a hemispherical top block is arranged on the end of the screw rod close to the resonant sheet, and a knob is arranged on the end of the screw rod away from the resonant sheet.

[0010] Further, the float includes a cylinder body and a cylinder bottom, the cylinder body is a through cylinder structure, and an outer thread is arranged on the lower part of the side wall of the cylinder body; the cylinder bottom is an open cylinder structure, an inner thread is arranged on the inner wall of the cylinder bottom, and the cylinder bottom is screwed at the lower end of the cylinder body, and the screwing depth of the cylinder bottom is adjustable.

[0011] Further, the resonance sheet is a metal sheet, a polyimide film or a composite sheet of the metal sheet and the polyimide film.

[0012] Further, the first ultrasonic emitter is used to emit an ultrasonic signal with a frequency of 50-80 kHz to the liquid surface, and the second ultrasonic emitter is used to emit an ultrasonic signal with a frequency of 20-40 kHz to the liquid surface.

[0013] Further, the single emission time of the first ultrasonic emitter is 1 s, and the single emission time of the second ultrasonic emitter is 5-10 s.

[0014] The technical scheme provided by the embodiment of the present application has at least the following technical effects or advantages:

[0015] 1. By placing the float with the resonance sheet on the liquid surface, the vibration of the resonance sheet is caused by the low-frequency ultrasonic signal emitted by the second ultrasonic emitter, so that the elimination of the foam on the liquid surface is realized, and the detection accuracy of the ultrasonic liquid level meter is avoided from being affected by the foam;

[0016] 2. The liquid surface is detected by the high-frequency ultrasonic signal emitted by the first ultrasonic emitter, so that the resolution and measurement accuracy of the liquid level detection are improved by using the high-frequency ultrasonic wave, and the detection accuracy of the liquid level meter is improved;

[0017] 3. By unevenly arranging the probes around the resonance sheet, the vibration of the probes is used to push the float to move on the liquid surface, so that the defoaming operation of the entire liquid surface is realized, and the accuracy of the liquid level detection is ensured;

[0018] 4. By arranging the movable top block in the float, the tension of the resonance sheet is adjusted by the pressure of the top block on the resonance sheet, so that the natural frequency of the resonance sheet is adjusted, the vibration amplitude of the resonance sheet is improved, and the defoaming efficiency is improved;

[0019] 5. By arranging the movable cylinder bottom, the floating volume of the float is adjusted by adjusting the screwing depth of the cylinder bottom, the probes are arranged below the liquid surface, and the defoaming operation of different density liquids can be met. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0021] Figure 1 It is a float appearance schematic diagram of the embodiment of the application.

[0022] Figure 2 It is a float structure schematic diagram of the embodiment of the application.

[0023] Reference signs: 1, float; 11, cylinder body; 12, cylinder bottom; 2, resonance sheet; 3, probe; 4, support; 5, nut; 6, top block; 7, screw rod; 8, knob. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the application to achieve the predetermined application purposes, the specific embodiments, structures, features and effects according to the application are described in detail as follows in combination with the drawings and preferred embodiments.

[0025] A high-precision intelligent liquid level meter comprises a liquid level meter body and a float. The liquid level meter body is installed above a container to be detected through a support, and the float floats on the liquid surface.

[0026] The liquid level meter body comprises a first ultrasonic transmitter, a second ultrasonic transmitter and an ultrasonic receiver. The first ultrasonic transmitter is used to emit a high-frequency ultrasonic wave signal of 50-80 kHz to the liquid surface, and the second ultrasonic transmitter is used to emit a low-frequency ultrasonic wave signal of 20-40 kHz to the liquid surface. The single emission time of the first ultrasonic transmitter is 1 s, and the single emission time of the second ultrasonic transmitter is 5 s. The first ultrasonic transmitter and the second ultrasonic transmitter are started intermittently in an interleaved manner. The ultrasonic receiver is used to receive the ultrasonic wave signal emitted by the first ultrasonic transmitter and reflected from the liquid surface, and to calculate the information of the liquid level according to the time difference between emission and reception. The high-frequency ultrasonic wave signal emitted by the first ultrasonic transmitter is used to detect the liquid surface, so as to improve the resolution and measurement accuracy of the liquid level detection and the detection accuracy of the liquid level meter.

[0027] As Figure 1 , Figure 2As shown in the drawings, the float comprises a float cylinder 1, the float cylinder 1 is a cylindrical barrel, an opening is arranged at the upper end of the float cylinder 1, a resonant sheet 2 is arranged at the opening, the natural frequency of the resonant sheet 2 is equal to the frequency of the ultrasonic wave signal emitted by the second ultrasonic emitter, and the resonant sheet 2 and the float cylinder 1 form a closed structure. The resonant sheet 2 is a titanium alloy metal sheet, a polyimide film or a composite sheet of the titanium alloy metal sheet and the polyimide film, the thickness of the resonant sheet 2 is less than 1 mm, and the outer diameter of the resonant sheet 2 is greater than 30 mm. An outer ring of the resonant sheet 2 is fixed with a ring of probes 3, the tip of the probe 3 is bent downward to extend into the liquid. In use, the resonant sheet 2 resonates under the action of the low-frequency ultrasonic wave signal emitted by the second ultrasonic emitter, and the probe 3 forms a cavitation effect in the liquid to eliminate the foam on the surface of the liquid. By using the strong penetration characteristic of the low-frequency ultrasonic wave signal, the elimination effect of the foam on the liquid surface is improved, and the detection accuracy of the ultrasonic liquid level meter is improved.

[0028] Preferably, the probes 3 are unevenly distributed on the outer ring of the resonant sheet 2. The probe 3 generates liquid micro-flow when vibrating at a high frequency. Due to the uneven distribution of the probe 3, different liquid micro-flows are formed around the float, thereby pushing the float to move on the liquid surface, so as to realize the defoaming operation of the entire liquid surface and ensure the accuracy of the liquid level detection.

[0029] As shown in the drawings, Figure 2 A support 4 is arranged in the float cylinder 1, a nut 5 is arranged on the support 4, and the nut 5 is located on the central axis of the float cylinder 1. A screw rod 7 is screwed on the nut 5, a hemispherical top block 6 is arranged at the upper end of the screw rod 7, and a knob 8 is arranged at the lower end of the screw rod 7. The screw rod 7 is rotated through the knob 8, so as to drive the top block 6 to approach or move away from the resonant sheet 2, thereby changing the tension of the resonant sheet 2.

[0030] The natural frequency f of the resonant sheet 2 is:

[0031]

[0032] In the formula, a is the radius of the resonant sheet 2, T is the tension of the resonant sheet 2, and is the area density of the resonant sheet 2. It can be seen that the tension of the resonant sheet 2 is adjusted to realize the adjustment of the natural frequency of the resonant sheet 2, so that the frequency of the resonant sheet 2 matches the frequency of the ultrasonic wave signal emitted by the second ultrasonic sensor, the vibration amplitude of the resonant sheet 2 is maximized, and the defoaming efficiency is improved.

[0033] As shown in the drawings, Figure 2As shown, the float 1 comprises a cylinder body 11 and a cylinder bottom 12. The cylinder body 11 is a through-going cylinder structure, and the lower part of the side wall of the cylinder body 1 is provided with external threads. The cylinder bottom 12 is a cylinder structure with an open upper end, and the inner wall of the cylinder bottom 12 is provided with internal threads. The cylinder bottom 12 is screwed to the lower end of the cylinder body 11, and the screwing depth of the cylinder bottom 12 is adjustable. The greater the screwing depth of the cylinder bottom 12, the smaller the volume of the float 1, and the greater the depth of the probe 3 immersed in the liquid surface. The smaller the screwing depth of the cylinder bottom 12, the greater the volume of the float 1, and the smaller the depth of the probe 3 immersed in the liquid surface. By setting a movable cylinder bottom, the volume of the float under the liquid surface is adjusted by adjusting the screwing depth of the cylinder bottom, so that the probe is ensured to be below the liquid surface, and the defoaming operation of different density liquids is met.

[0034] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change and modification of the above embodiments according to the technical essence of the present application, as long as it does not deviate from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A high-precision intelligent liquid level meter, characterized in that, The system includes a level gauge body and a float. The level gauge body is mounted above a container, and the float floats on the liquid surface. The level gauge body includes a first ultrasonic transmitter, a second ultrasonic transmitter, and an ultrasonic receiver. The first and second ultrasonic transmitters emit ultrasonic signals towards the liquid surface, and the first and second ultrasonic transmitters are activated intermittently and alternately. The ultrasonic receiver receives the ultrasonic signals emitted by the first ultrasonic transmitter reflected from the liquid surface. The float includes a float cylinder with an opening at its upper end. A resonant plate is placed at the opening, and the resonant plate and the float cylinder form a sealed structure. The resonant plate is at least partially in contact with the liquid, and the resonant plate's natural frequency... The frequency is equal to the frequency of the ultrasonic signal emitted by the second ultrasonic transmitter. The resonant plate resonates under the action of the second ultrasonic transmitter, thus defoaming the liquid. A probe is provided on the outer ring of the resonant plate, and the tip of the probe bends downward and extends into the liquid. The float includes a cylinder and a bottom. The cylinder is a cylindrical structure that runs vertically through the body, and the lower part of the side wall of the cylinder is provided with external threads. The bottom is a cylindrical structure with an open top, and the inner wall of the bottom is provided with internal threads. The bottom is screwed to the lower end of the cylinder, and the screwing depth of the bottom is adjustable. By adjusting the screwing depth of the bottom, the volume of the float is adjusted, thereby ensuring that the probe is below the liquid surface, which can meet the defoaming operation of liquids with different densities.

2. The high-precision intelligent liquid level meter according to claim 1, characterized in that, The probes are unevenly distributed around the outer ring of the resonant plate.

3. The high-precision intelligent level gauge according to claim 1, characterized in that, A support is installed inside the float, and a nut is installed on the support. The nut is located on the central axis of the float. A screw is screwed onto the nut. A hemispherical top block is installed at the end of the screw near the resonant plate, and a knob is installed at the end of the screw away from the resonant plate.

4. A high-precision intelligent level gauge according to claim 1, characterized in that, The resonant sheet is a metal sheet, a polyimide film, or a composite sheet of a metal sheet and a polyimide film.

5. A high-precision intelligent level gauge according to claim 1, characterized in that, The first ultrasonic transmitter is used to emit ultrasonic signals of 50-80 kHz towards the liquid surface, and the second ultrasonic transmitter is used to emit ultrasonic signals of 20-40 kHz towards the liquid surface.

6. A high-precision intelligent level gauge according to claim 1, characterized in that, The first ultrasonic transmitter has a single transmission duration of 1 second, and the second ultrasonic transmitter has a single transmission duration of 5-10 seconds.

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