CN104266721A - Integrated ultrasonic liquid level gauge - Google Patents

Abstract

The invention discloses an integrated ultrasonic liquid level meter, which comprises an ultrasonic probe, a control device and a shell for mounting the ultrasonic probe and the control device, the control device comprises a microprocessor, a transmitting output circuit, a data storage circuit, a receiving input circuit, a power supply circuit and a wireless transmitting module, the transmitting output circuit can control the ultrasonic probe to transmit ultrasonic signals, the receiving input circuit receives the ultrasonic signals reflected by the liquid level and processes the ultrasonic signals by the microprocessor to obtain the liquid level height, the data storage circuit stores the liquid level height data, the wireless transmitting module transmits the liquid level height data, and the wireless terminal arranged in the control center or the monitoring center receives the data, can real-time control liquid level height, owing to adopt the integral type design, install convenience very, need not extra wiring, the practicality is strong.

Description

Integrated ultrasonic liquid level gauge

technical field

The invention relates to an integrated ultrasonic liquid level gauge.

Background technique

Liquid level measurement is widely used in industrial production processes. At present, there are many liquid level measurement methods, such as using manual dipstick, glass tube, float type, capacitance method, ultrasonic, radar, optical fiber, etc. to measure liquid level. In practical applications, it is necessary to accurately measure the liquid level in a closed container. Since these liquids are generally explosive, volatile, highly corrosive and toxic liquids, it brings certain difficulties to the traditional contact liquid level detection. Contact, intelligence, high precision, and low power consumption are the development directions of liquid level gauges. Since the speed of ultrasonic waves is much smaller than the speed of light, the propagation time is easier to detect, and it is easy to directional launch, with good directionality and good intensity control. , It solves the troubles of winding, leakage, contact with medium, expensive maintenance and other troubles caused by pressure transmitters, capacitive, float and other measurement methods, and has obvious advantages and broad development prospects.

However, most of the current ultrasonic liquid level gauges have a split structure. The host is set at a certain distance from the ultrasonic probe and transmitted through a cable. It is very troublesome to install and it is not convenient to quickly or temporarily measure the liquid level.

Contents of the invention

In order to overcome the deficiencies of the prior art, the invention provides an integrated ultrasonic liquid level gauge.

The technical solution adopted by the present invention to solve its technical problems is:

An integrated ultrasonic liquid level gauge, including an ultrasonic probe, a control device and a housing for installing the ultrasonic probe and the control device, the control device includes a microprocessor, a transmitting output circuit, a data storage circuit, a receiving input circuit, a power supply circuit and The wireless transmitting module, the transmitting output circuit can control the ultrasonic probe to send ultrasonic signals, the receiving input circuit receives the ultrasonic signals reflected by the liquid surface and is processed by the microprocessor to obtain the liquid level height, which is stored by the data storage circuit The liquid level height data is sent out by the wireless transmitting module.

The transmission output circuit includes a power amplitude amplification circuit and a pulse generation circuit.

The receiving input circuit includes an amplifier circuit, a filter circuit, and an A/D conversion circuit.

It also includes a calibration measuring tool, which is arranged under the ultrasonic probe, and there is a known height difference between the calibration measuring tool and the ultrasonic probe.

The ultrasonic probe is a piezoelectric ceramic integrated ultrasonic sensor.

The control device also includes a temperature acquisition circuit for temperature compensation.

The transmitting output circuit is provided with an isolation transformer.

The beneficial effects of the present invention are: an integrated ultrasonic liquid level gauge, including an ultrasonic probe, a control device and a housing for installing the ultrasonic probe and the control device, the control device includes a microprocessor, a transmission output circuit, a data storage circuit, Receiving input circuit, power supply circuit and wireless transmitting module, the transmitting output circuit can control the ultrasonic probe to send out the ultrasonic signal, the receiving input circuit receives the ultrasonic signal reflected by the liquid surface and is processed by the microprocessor to obtain the liquid level Height, the liquid level height data is stored by the data storage circuit, and then the liquid level height data is sent by the wireless transmitter module, and then the wireless terminal installed in the control center or monitoring center receives the data, and the liquid level height can be monitored in real time. One-piece design, very convenient to install, no need for additional wiring, strong practicability.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the circuit principle of the present invention.

Detailed ways

Referring to Fig. 1, Fig. 1 is a schematic diagram of the circuit principle of a specific embodiment of the present invention. As shown in the figure, the integrated ultrasonic liquid level gauge includes an ultrasonic probe, a control device and a housing for installing the ultrasonic probe and the control device. The control device includes a microprocessor, a transmitting output circuit, a data storage circuit, a receiving input circuit, a power supply circuit and a wireless transmitting module, the transmitting output circuit includes a power amplitude amplifier circuit, a pulse generating circuit, and the receiving input circuit includes an amplifier circuit, filter circuit, A/D conversion circuit, the control device also includes a temperature acquisition circuit for temperature compensation, and the transmission output circuit is also provided with a vibration isolation transformer capable of isolating subsequent ultrasonic waves.

Preferably, the microprocessor is selected STC89C52 single-chip microcomputer, the ultrasonic probe is a waterproof piezoelectric ceramic integrated ultrasonic sensor TCF40-18TR1, the A/D conversion circuit selects the ADS930 analog-to-digital conversion chip, and the temperature acquisition The digital temperature sensor DS18B20 is used for the circuit, the AT24C04 chip is used for the data storage circuit, and the NRF2401 chip is used for the wireless transmitting module and the wireless receiving module.

When in use, the ultrasonic probe is installed above the liquid level, facing the liquid level. After the system is initialized, the pulse signal generated by the microprocessor is amplified by the power amplitude, and the ultrasonic probe is excited to generate high-frequency ultrasonic waves. The ultrasonic waves are transmitted through the medium. When the ultrasonic energy reaches the liquid surface, the ultrasonic energy is reflected back to the ultrasonic probe as an echo signal. The transmitted signal and the echo signal enter the signal receiving system together for amplification and filtering. After being converted into digital signals by A/D, they are sent to the microprocessor. The processor processes, calculates, converts, and considers the temperature measured by the temperature acquisition circuit, performs temperature compensation, and then sends it to the wireless terminal set in the control center or monitoring center through the wireless transmitting module, so that the liquid level can be monitored in real time. It adopts one-piece design, which is very convenient to install, without additional wiring, and has strong practicability. the

Further, the present invention also includes a calibration measuring tool, the calibration measuring tool is arranged under the ultrasonic probe, and there is a known height difference between the calibration measuring tool and the ultrasonic probe, the ultrasonic probe can send a calibration ultrasonic signal, and the calibration ultrasonic signal is corrected The measuring tool is reflected back to the ultrasonic probe, and the real-time gas sound velocity can be calculated according to the ultrasonic propagation time and height difference, realizing the function of correcting the gas sound velocity.

The preferred implementation of the present invention has been described in detail above. Of course, the present invention can also adopt different forms from the above-mentioned embodiments. Those skilled in the art can make equivalent transformations or corresponding equivalents without violating the spirit of the present invention. Any changes should fall within the protection scope of the present invention.

Claims (7)

1. integral type ultrasonic level gage, it is characterized in that: comprise ultrasonic probe, control device and the housing for installing ultrasonic probe and control device, described control device comprises microprocessor, launch output circuit, data storage circuitry, receive input circuit, feed circuit and wireless transmitter module, described transmitting output circuit can control ultrasonic probe and send ultrasonic signal, described reception input circuit receives the ultrasonic signal that returns through liquid level reflection and carries out process by microprocessor and draws liquid level, liquid level data are stored by data storage circuitry, by wireless transmitter module, liquid level data are sent again.

2. integral type ultrasonic level gage according to claim 1, is characterized in that: described transmitting output circuit comprises power magnitude amplifying circuit, pulse-generating circuit.

3. integral type ultrasonic level gage according to claim 1, is characterized in that: described reception input circuit comprises amplifying circuit, filtering circuit, A/D change-over circuit.

4. integral type ultrasonic level gage according to claim 1, is characterized in that: also comprise a correction measurer, and this correction measurer is arranged on below ultrasonic probe, and there is a known difference in height between this correction measurer and ultrasonic probe.

5. integral type ultrasonic level gage according to claim 1, is characterized in that: described ultrasonic probe is piezoelectric ceramics integral type ultrasonic sensor.

6. integral type ultrasonic level gage according to claim 1, is characterized in that: described control device also comprises temperature collection circuit, plays temperature compensation function.

7. integral type ultrasonic level gage according to claim 1, is characterized in that: described transmitting output circuit is provided with isolating transformer.