There is no limit to creativity, and the instrument is invented. Today we introduce a national invention patent for authorization - an ultrasonic level transmitter. The patent was applied by Dalian Yiyuan Technology Co., Ltd. and was authorized to be announced on March 8, 2017.
Description
The utility model relates to an ultrasonic level transmitter, belonging to the technical field of level measurement.
Background of the invention
The ultrasonic level meter is a meter that measures the height of the material in the container by using the principle of sound wave reflection. It can measure and display the level value (level or level) and the output signal is transmitted to the host computer in the main control room. The ultrasonic level gauge is composed of an electronic unit, a piezoelectric transducer and an outer casing, and is divided into an integral type and a split type. The piezoelectric transducer packaged with the outer casing 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 meter, the electronic unit is inside the housing, and the lower part of the housing is combined with a piezoelectric transducer; when the electronic unit and the piezoelectric transducer When each of them forms an independent structure, it is called a split type ultrasonic level gauge, and the two are connected by an external cable .
The existing ultrasonic level meter, whether it is an integrated or split structure, needs to set some installation parameters through the buttons and display provided by the ultrasonic level meter to make the level meter work normally. The ultrasonic level gauge first measures the distance to the surface of the object, and the level value (level or level) is obtained by subtracting the distance measurement from the mounting height (distance from the surface of the piezoelectric transducer to the bottom of the container). Therefore, the installation height must be set to the level meter, and other parameters such as the full-scale current signal and zero point of the remote transmission must also be set. The ultrasonic level gauge must provide a button and display section for the user to set the necessary parameters. The structure of the ultrasonic level meter with the above device is complicated, the volume is large, and the manufacturing cost is relatively large.
Summary of the invention
The utility model proposes a solution to the shortage of the above ultrasonic level gauge, that is, an ultrasonic level transmitter is designed to remove the button and the display part in the electronic unit, thereby compressing the volume of the entire electronic unit, and the electronic unit is compressed. Integrated with a piezoelectric transducer to form a two-wire integrated level transmitter that transmits a DC 4 to 20 mA current signal through a 2-core cable and is on the same circuit. Powered by the outside, the part below 4mA in the loop is used for the internal circuit of the transmitter, and the part above 4mA is output as the distant signal.
Therefore, the transmitter is an integrated structure, the power supply and the current signal output are in the same circuit of the two-wire system, and the electronic unit and the piezoelectric transducer are sealed in a single casing, and the electronic unit includes a voltage conversion, a single chip system. , piezoelectric transducer drive, echo signal reception, Bluetooth communication and DC 4 ~ 20mA current output circuit, piezoelectric transducer is a single transducer for transceiver.
Since the speed of sound is affected by temperature, in order to improve the measurement accuracy, a temperature sensor should be packaged in the housing. A 2-core cable is led out from inside the housing for signal transmission to the outside world and to supply power to the transmitter. Since the electronic unit removes the buttons and the display, the original housing for the electronic unit is removed, which further reduces the cost, reduces the product price, and saves the user cost. The parameter setting is more convenient and flexible due to the provision of Bluetooth communication.
Description
The utility model relates to an ultrasonic level transmitter, belonging to the technical field of level measurement.
Background of the invention
The ultrasonic level meter is a meter that measures the height of the material in the container by using the principle of sound wave reflection. It can measure and display the level value (level or level) and the output signal is transmitted to the host computer in the main control room. The ultrasonic level gauge is composed of an electronic unit, a piezoelectric transducer and an outer casing, and is divided into an integral type and a split type. The piezoelectric transducer packaged with the outer casing 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 meter, the electronic unit is inside the housing, and the lower part of the housing is combined with a piezoelectric transducer; when the electronic unit and the piezoelectric transducer When each of them forms an independent structure, it is called a split type ultrasonic level gauge, and the two are connected by an external cable .
The existing ultrasonic level meter, whether it is an integrated or split structure, needs to set some installation parameters through the buttons and display provided by the ultrasonic level meter to make the level meter work normally. The ultrasonic level gauge first measures the distance to the surface of the object, and the level value (level or level) is obtained by subtracting the distance measurement from the mounting height (distance from the surface of the piezoelectric transducer to the bottom of the container). Therefore, the installation height must be set to the level meter, and other parameters such as the full-scale current signal and zero point of the remote transmission must also be set. The ultrasonic level gauge must provide a button and display section for the user to set the necessary parameters. The structure of the ultrasonic level meter with the above device is complicated, the volume is large, and the manufacturing cost is relatively large.
Summary of the invention
The utility model proposes a solution to the shortage of the above ultrasonic level gauge, that is, an ultrasonic level transmitter is designed to remove the button and the display part in the electronic unit, thereby compressing the volume of the entire electronic unit, and the electronic unit is compressed. Integrated with a piezoelectric transducer to form a two-wire integrated level transmitter that transmits a DC 4 to 20 mA current signal through a 2-core cable and is on the same circuit. Powered by the outside, the part below 4mA in the loop is used for the internal circuit of the transmitter, and the part above 4mA is output as the distant signal.
Figure is a schematic diagram showing the structure of a specific embodiment of the ultrasonic level transmitter of the utility model
The electronic unit is designed with a compact Bluetooth module for transmitting and receiving 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, and can be fixed at a distance transmitter. Read the measurement data and internal parameters of the transmitter within the range, without having to be close to the transmitter, it is convenient to debug the equipment. The Bluetooth module adopts the active sleep mode and wakes up once 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, and the single chip system controls the piezoelectric transducer drive circuit to work periodically, and the echo signal receiving circuit receives the piezoelectric transducer echo signal 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 DC 4~20mA current output circuit. The single-chip computer controls the Bluetooth communication module to communicate with the outside world. Therefore, the transmitter is an integrated structure, the power supply and the current signal output are in the same circuit of the two-wire system, and the electronic unit and the piezoelectric transducer are sealed in a single casing, and the electronic unit includes a voltage conversion, a single chip system. , piezoelectric transducer drive, echo signal reception, Bluetooth communication and DC 4 ~ 20mA current output circuit, piezoelectric transducer is a single transducer for transceiver.
Since the speed of sound is affected by temperature, in order to improve the measurement accuracy, a temperature sensor should be packaged in the housing. A 2-core cable is led out from inside the housing for signal transmission to the outside world and to supply power to the transmitter. Since the electronic unit removes the buttons and the display, the original housing for the electronic unit is removed, which further reduces the cost, reduces the product price, and saves the user cost. The parameter setting is more convenient and flexible due to the provision of Bluetooth communication.
The manufacturing process of optical cable is generally divided into the following processes:
1. Optical fiber selection: select optical fibers with excellent transmission characteristics and qualified tension.
2. The dyeing of the optical fiber: the standard full chromatogram is used for identification, and the high temperature is required to be non-fading and non-migrating.
Optical cable
Optical cable
3. Secondary extrusion: select high elastic modulus, low linear expansion coefficient plastic to extrude into a tube of a certain size, put the optical fiber into and fill it with moisture-proof and waterproof gel, and finally store it for a few days (not less than two days) .
4. Optical cable stranding: stranding several extruded optical fibers with the strengthening unit.
5. Squeeze the outer sheath of the optical cable: add a layer of sheath to the stranded optical cable.
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