Today, I will introduce a national invention authorized patent-an ultrasonic level transmitter. The patent was applied for by Dalian Yiyuan Technology Co., Ltd., and the authorization was announced on March 8, 2017.
Content descriptionThe utility model relates to an ultrasonic level transmitter, which belongs to the technical field of level measurement.
Background of the inventionThe ultrasonic level meter is an instrument that uses the principle of sound wave reflection to measure the height of the material in the container. It can measure and display the level value (liquid level or material level), and the output signal is transmitted to the host computer in the main control room. The ultrasonic level meter is composed of an electronic unit, a piezoelectric transducer and an outer shell. It is divided into two types: one-piece and split-type. The piezoelectric transducer with a shell is also called an ultrasonic sensor. When the electronic unit and the piezoelectric transducer form an integrated structure, it is called an integrated ultrasonic level gauge. The electronic unit is inside the shell, and the lower part of the shell is combined with the piezoelectric transducer; when the electronic unit and the piezoelectric transducer When each form an independent structure, it is called a split ultrasonic level gauge, and the two are connected by an external cable.
Existing ultrasonic level gauges, whether integrated or split structure, need to be installed and used to set some installation parameters through the keys and displays provided by the ultrasonic level gauges, so that the level gauges can work normally. The ultrasonic level meter first measures the distance to the surface of the object, and the level value (liquid level or material level) is obtained by subtracting the distance measurement value from the installation height (the distance from the surface of the piezoelectric transducer to the bottom of the container) Therefore, the installation height must be set in the level gauge, and other parameters such as the full scale and zero point of the remote current signal must also be set. Ultrasonic level meters must provide buttons and display parts for users to set the necessary parameters. As a result, the ultrasonic level gauge with the above device has a complicated structure, a large volume, and a relatively large manufacturing cost.
Summary of the inventionThe utility model proposes a solution to the shortage of the above-mentioned ultrasonic level meter, which is to design an ultrasonic level transmitter to remove the keys and the display part in the electronic unit, thereby compressing the volume of the entire electronic unit and integrating the electronic unit It is integrated with the piezoelectric transducer into a smaller shell to form a two-wire integrated level transmitter, which transmits a DC4-20mA current signal remotely through a 2-core cable, and is on the same loop Power is supplied externally, the part below 4mA in the loop is used for the internal circuit of the transmitter, and the part above 4mA is output as a remote signal.
A small Bluetooth module is designed in the electronic unit to send and receive Bluetooth electromagnetic signals. The user can set the installation parameters required by the level transmitter through a handheld device with Bluetooth communication, such as a mobile phone. The measurement data and internal parameters of the transmitter can be read within the range, without directly approaching the transmitter, which is convenient for debugging the equipment. The Bluetooth module adopts an active sleep mode and wakes up every certain period, which can effectively reduce the power consumption of the transmitter. The voltage conversion circuit converts the external power supply into the working voltage required by each circuit in the electronic unit. The single-chip microcomputer system controls the piezoelectric transducer driving circuit to work periodically. The echo signal receiving circuit receives the echo signal of the piezoelectric transducer and triggers the single-chip microcomputer. The system performs data processing. The single-chip microcomputer system collects the temperature sensor signal and controls the signal output of the DC4-20mA current output circuit. The single-chip microcomputer controls the Bluetooth communication module to communicate with the outside world.
Therefore, the transmitter is an integrated structure, the power supply and current signal output are in the same loop two-wire form, composed of an electronic unit and a piezoelectric transducer sealed in a single shell. The electronic unit includes voltage conversion and a single-chip microcomputer system. , Piezoelectric transducer drive, echo signal receiving, Bluetooth communication and DC4-20mA current output circuit. The piezoelectric transducer is a single transducer combining transceiver.
Since the speed of sound is affected by temperature, in order to improve the measurement accuracy, a temperature sensor should be encapsulated in the housing. A 2-core cable is led out from the inside of the shell for signal transmission with the outside world and power supply to the transmitter. Because the electronic unit removes the keys and the display, and then removes the original shell used to house the electronic unit, this further reduces the cost, reduces the product price, and saves the user cost. As Bluetooth communication is provided, the parameter setting is more convenient and flexible.
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