High-precision intelligent liquid level meter

Abstract

The high-precision intelligent liquid level meter comprises a liquid level meter body and a floater, the liquid level meter body is installed above a container, and the floater floats on the liquid level; the liquid level meter body comprises a first ultrasonic transmitter, a second ultrasonic transmitter and an ultrasonic receiver; the floater comprises a buoy, a resonance piece is arranged at an opening in the upper end of the buoy, at least part of the resonance piece makes contact with the liquid, and the resonance piece generates resonance under the action of the second ultrasonic transmitter to conduct defoaming treatment on the liquid. The floater with the resonance piece is placed on the liquid level, the second ultrasonic transmitter transmits low-frequency ultrasonic signals to cause vibration of the resonance piece, foam on the liquid level is eliminated, and it is avoided that the foam influences the detection precision of the ultrasonic liquid level meter; the liquid level is detected by utilizing the high-frequency ultrasonic signal transmitted by the first ultrasonic transmitter, so that the resolution ratio and the measurement precision of liquid level detection are improved by utilizing 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 art. The application is achieved by the following technical scheme: 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, 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 to emit ultrasonic signals to the liquid surface. The first ultrasonic emitter and the second ultrasonic emitter are started intermittently in an interleaved manner. The ultrasonic receiver is used to receive 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. The resonant sheet produces resonance under the action of the second ultrasonic emitter to perform defoaming treatment on the liquid.

[0006] Further, a probe is arranged at the outer circle of the resonant sheet. The tip of the probe is bent downward and extends into the liquid.

[0007] Further, the probes are unevenly distributed at the outer circle of the resonant sheet.

[0008] Further, a support is arranged in the float tank. A nut is mounted 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 mounted on the end of the screw rod close to the resonant sheet. A knob is mounted on the end of the screw rod away from the resonant sheet.

[0009] 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 a lower part of a side wall of the cylinder body; the cylinder bottom is a cylinder structure with an open upper end, an inner thread is arranged on an inner wall of the cylinder bottom, and the cylinder bottom is screwed at a lower end of the cylinder body, and a screwing depth of the cylinder bottom is adjustable.

[0010] Further, the resonance sheet is a metal sheet, a polyimide film or a composite sheet of the metal sheet and the polyimide film.

[0011] 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.

[0012] Further, a single emission time of the first ultrasonic emitter is 1 s, and a single emission time of the second ultrasonic emitter is 5-10 s.

[0013] The technical scheme provided by the embodiment of the present application has at least the following technical effects or advantages: 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 foam on the liquid surface is eliminated, and the detection accuracy of the ultrasonic liquid level meter is avoided from being affected by the foam; 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; 3. The probes are arranged unevenly around the resonance sheet, the vibration of the probes pushes 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; 4. The movable top block is arranged 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; 5. The movable cylinder bottom is arranged, the floating volume of the float is adjusted by adjusting the screwing depth of the cylinder bottom, the probes are below the liquid surface, and the defoaming operation of different density liquids can be met. BRIEF DESCRIPTION OF DRAWINGS

[0014] 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 laborious work.

[0015] Figure 1 It is an appearance schematic diagram of the float in the embodiment of the present application; Figure 2 This is a schematic diagram of the float structure of an embodiment of the present application.

[0016] Figure numerals: 1, float; 11, cylinder; 12, cylinder bottom; 2, resonance plate; 3, probe; 4, bracket; 5, nut; 6, top block; 7, screw; 8, knob. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0018] A high-precision intelligent liquid level gauge includes a liquid level gauge body and a float. The liquid level gauge body is installed above the container to be detected through a bracket, and the float floats on the liquid surface.

[0019] The liquid level meter body includes a first ultrasonic transmitter, a second ultrasonic transmitter and an ultrasonic receiver. The first ultrasonic transmitter is used to transmit a high-frequency ultrasonic signal of 50-80kHz to the liquid surface, and the second ultrasonic transmitter is used to transmit a low-frequency ultrasonic signal of 20-40kHz to the liquid surface. The single transmission time of the first ultrasonic transmitter is 1s, and the single transmission time of the second ultrasonic transmitter is 5s. The first ultrasonic transmitter and the second ultrasonic transmitter are started intermittently in an intermittent manner. The ultrasonic receiver is used to receive the ultrasonic signal emitted by the first ultrasonic transmitter reflected from the liquid surface, and calculate the liquid level information based on the time difference between transmission and reception. The high-frequency ultrasonic signal emitted by the first ultrasonic transmitter is used to detect the liquid level, thereby utilizing high-frequency ultrasonic waves to improve the resolution and measurement accuracy of liquid level detection, thereby improving the detection accuracy of the liquid level meter.

[0020] like Figure 1 、 Figure 2 As shown, the float includes a buoy 1, which is a cylindrical cylinder with an opening at its upper end. A resonant plate 2 is mounted at the opening. The natural frequency of the resonant plate 2 is equal to the frequency of the ultrasonic signal emitted by the second ultrasonic transmitter. The resonant plate 2 and the buoy 1 form a sealed structure. The resonant plate 2 is a titanium alloy sheet, a polyimide film, or a composite of a titanium alloy sheet and polyimide film. The thickness of the resonant plate 2 is less than 1 mm, and the outer diameter of the resonant plate 2 is greater than 30 mm. A probe 3 is fixed to the outer ring of the resonant plate 2, with the tip of the probe 3 curved downward and extending into the liquid. During operation, the resonant plate 2 resonates in response to the low-frequency ultrasonic signal emitted by the second ultrasonic transmitter. The probe 3 creates a cavitation effect in the liquid, eliminating foam on the liquid surface. By leveraging the strong penetrating power of the low-frequency ultrasonic signal, the effectiveness of eliminating foam on the liquid surface is improved, thereby enhancing the detection accuracy of the ultrasonic level meter.

[0021] Preferably, the probes 3 are unevenly distributed on the outer ring of the resonant sheet 2. The probes 3 generate liquid microflows when vibrating at high frequency. Due to the uneven distribution of the probes 3, different liquid microflows 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 guarantee the accuracy of the liquid level detection.

[0022] As shown in Figure 2 The float 1 is provided with a bracket 4, and the bracket 4 is provided with a nut 5 located on the central axis of the float 1. The nut 5 is screwed with a screw rod 7, the upper end of the screw rod 7 is provided with a hemispherical top block 6, and the lower end of the screw rod 7 is provided with a knob 8. The knob 8 is used to rotate the screw rod 7, 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.

[0023] The natural frequency f of the resonant sheet 2 is: 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 by adjusting the tension of the resonant sheet 2, the natural frequency of the resonant sheet 2 can be adjusted, 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.

[0024] As shown in Figure 2 The float 1 includes a barrel body 11 and a barrel bottom 12. The barrel body 11 is a cylindrical structure penetrating from top to bottom, and the lower part of the side wall of the barrel body 1 is provided with external threads. The barrel bottom 12 is a cylindrical structure with an open upper end, and the inner wall of the barrel bottom 12 is provided with internal threads. The barrel bottom 12 is screwed at the lower end of the barrel body 11, and the screwing depth of the barrel bottom 12 is adjustable. The greater the screwing depth of the barrel bottom 12, the smaller the volume of the float 1, and the greater the depth of the probes 3 immersed in the liquid surface. The smaller the screwing depth of the barrel bottom 12, the greater the volume of the float 1, and the smaller the depth of the probes 3 immersed in the liquid surface. By setting the movable barrel bottom, the volume of the float below the liquid surface is adjusted by adjusting the screwing depth of the barrel bottom, so that the probes are below the liquid surface, and the defoaming operation of different density liquids is met.

[0025] 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 without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications are equivalent to the above embodiments. Any modification, change, modification and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A high-precision intelligent liquid level gauge, characterized in that: The liquid level meter comprises a body and a float, wherein the body is mounted above the container and the float floats on the liquid surface; the body comprises a first ultrasonic transmitter, a second ultrasonic transmitter and an ultrasonic receiver, wherein the first ultrasonic transmitter and the second ultrasonic transmitter are used to transmit ultrasonic signals to the liquid surface, the first ultrasonic transmitter and the second ultrasonic transmitter are activated intermittently in an alternating manner, and the ultrasonic receiver is used to receive the ultrasonic signal emitted by the first ultrasonic transmitter reflected from the liquid surface; the float comprises a buoy, wherein an opening is provided at the upper end of the buoy, a resonance plate is provided at the opening, and the resonance plate and the buoy form a sealed structure. The resonant plate is at least partially in contact with the liquid, and the natural frequency of the resonant plate 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 to defoam the liquid. The outer ring of the resonant plate is provided with a probe, and the tip of the probe is bent downward and extends into the liquid. The float includes a cylinder and a cylinder bottom. The cylinder is a cylindrical structure that passes through from top to bottom, and the lower portion of the side wall of the cylinder is provided with an external thread. The cylinder bottom is a cylindrical structure with an open upper end, and the inner wall of the cylinder bottom is provided with an internal thread. The cylinder bottom is screwed to the lower end of the cylinder body, and the screw-in depth of the cylinder bottom is adjustable.

2. A high-precision intelligent liquid level gauge according to claim 1, characterized in that: The probes are unevenly distributed on the outer circle of the resonance plate.

3. A high-precision intelligent liquid level gauge according to claim 1, characterized in that: A bracket is provided in the buoy, a nut is installed on the bracket, and the nut is located on the central axis of the buoy; a screw is threaded on the nut, a hemispherical top block is installed at one end of the screw close to the resonance plate, and a knob is installed at the end of the screw away from the resonance plate.

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

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

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

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