CN213817734U - High-precision water flow velocimeter - Google Patents
High-precision water flow velocimeter Download PDFInfo
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- CN213817734U CN213817734U CN202022446748.8U CN202022446748U CN213817734U CN 213817734 U CN213817734 U CN 213817734U CN 202022446748 U CN202022446748 U CN 202022446748U CN 213817734 U CN213817734 U CN 213817734U
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Abstract
A high-precision water flow velocimeter is used for effectively improving the accuracy of velocity measurement data. The device comprises a speed measurement sensor, a signal conditioning module, a timing module and a controller; the speed measuring sensor is used for detecting the flow velocity, the output end of the speed measuring sensor is connected with the input end of the signal conditioning module, and the pulse signal output by the speed measuring sensor is processed by the signal conditioning module; the output end of the signal conditioning module is connected with the input ends of the controller and the timing module; the control end of the timing module is connected with the controller, and the output end of the timing module is connected with the controller.
Description
Technical Field
The utility model relates to a rivers technical field that tests the speed, especially relates to a rivers tachymeter of high accuracy.
Background
The measurement of the fluid velocity is of great significance for researching the motion law of the fluid and the interaction mechanism between particles in the fluid. The current meter is an instrument for measuring the water flow velocity of water bodies such as rivers, lakes, channels and the like. At present, four types of machines, kinetic potential energy conversion, electrical measurement and ultrasound are mainly adopted. The device comprises a propeller type current meter, a pitot tube uniform point current velocity meter, an electromagnetic current meter and an ultrasonic current velocity measuring and calculating instrument. The accuracy of the velocimeter is mainly based on the detection data of the velocimeter sensor, and the accuracy of the data is mainly based on the counting accuracy of the output pulse signal. However, during speed measurement, it is very easy to happen that when a detection signal starts to arrive, the rising edge of the first detected pulse signal also arrives, then the counter just counts the first pulse, and when the detection signal stops arriving, the rising edge of the (N + 1) th pulse signal will arrive, then the counter loses the (N + 1) th pulse, and this situation will cause inaccurate counting, so that the measured data of the final velocimeter is inaccurate, and therefore it is very necessary to provide a high-precision water flow velocimeter.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a rivers tachymeter of high accuracy is provided to effectively improve the accuracy of the data that tests the speed.
The utility model provides a technical scheme as follows that above-mentioned technical problem took:
the utility model discloses a rivers tachymeter of high accuracy, characterized by: the device comprises a speed measurement sensor, a signal conditioning module, a timing module and a controller; the speed measuring sensor is used for detecting the flow velocity, the output end of the speed measuring sensor is connected with the input end of the signal conditioning module, and the pulse signal output by the speed measuring sensor is processed by the signal conditioning module; the output end of the signal conditioning module is connected with the input ends of the controller and the timing module; the control end of the timing module is connected with the controller, and the output end of the timing module is connected with the controller.
In the above technical solution, the signal conditioning module includes an isolation circuit and a shaping circuit, where the isolation circuit includes a 1 st resistor, a 2 nd resistor, a 3 rd resistor, a 4 th resistor, a 1 st transistor, and a 1 st processor; one end of the 1 st resistor is used as the input end of the circuit and connected with the speed measurement sensor, the other end of the 1 st resistor is connected with the base of the 1 st transistor, the collector of the 1 st transistor is connected with one end of the 2 nd resistor, the other end of the 2 nd resistor is connected with external voltage, the emitter of the 1 st transistor is connected with one end of the 3 rd resistor, the other end of the 3 rd resistor is connected with the pin 1 of the 1 st processor, the pin 2 and the pin 3 of the 1 st processor are both grounded, the pin 4 of the 1 st processor is connected with one end of the 4 th resistor, the other end of the 4 th resistor is connected with external voltage, and the pin 4 of the 1 st processor is also used as the output end of the circuit and connected with the shaping circuit.
In the above technical solution, the shaping circuit includes a 2 nd processor, a pin 1 of the 2 nd processor is used as an input terminal of the circuit to be connected with the shaping circuit, a pin 7 is grounded, a pin 8 is connected with an external voltage, a pin 2 is connected with a pin 9 thereof, and a pin 10 thereof is also used as an output terminal of the circuit to be connected with a next-stage circuit.
The timing module comprises a 5 th resistor, a 6 th resistor, a 7 th resistor, an 8 th resistor, a 9 th resistor, a 10 th resistor, a 3 rd processor, a 4 th processor, a 5 th processor, a 6 th processor and a 7 th processor; one end of the 5 th resistor is connected to an external voltage, the other end of the 5 th resistor is connected to a pin 4 of the 3 rd processor, and a pin 3 of the 3 rd processor is connected to a pin 1 of the 4 th processor after being connected with the output end of the shaping circuit; the pin 7 of the 3 rd processor is grounded, the pin 8 is connected to one ends of a 7 th resistor and a 9 th resistor and external voltage, the other end of the 9 th resistor is connected with the pin 1 of the 3 rd processor, and the pin 2 of the 3 rd processor is connected to the other end of the 7 th resistor and the pin 4 of the 5 th processor; a pin 3 of the 5 th processor is grounded, a pin 1 is connected to the other end of the 6 th resistor, one end of the 6 th resistor is connected with external voltage, and a pin 2 of the 5 th processor is used as a control end and connected with the controller; pin 6 of the 3 rd processor is connected to pin 2 of the 4 th processor and one end of an 8 th resistor (R8); pin 3 of the 4 th processor is connected to one end of a 10 th resistor, pin 7 of the 4 th processor is grounded, and pin 8 is connected with external voltage; the other end of the 8 th resistor is connected to a pin 1 of the 6 th processor, pins 2 of the 6 th processor and the 7 th processor are grounded, the other end of the 10 th resistor is connected to a pin 1 of the 7 th processor, and a pin 4 of the 6 th processor and the 7 th processor serves as an output end of the module and is connected with the controller.
The utility model has the advantages that the signal conditioning module conditions the signal output by the speed measuring sensor, isolates the signal, increases the safety, reduces the interference caused by external signals, avoids the error of later-stage test results caused by the uncertainty caused by various interference factors in the test site, and can reshape the signal of the unstable and uniform pulse signal output by the speed measuring sensor so as to prevent the signal generated by the circuit from impacting the damage of later-stage circuits; the timing module adopts the mode of twice counting, calculates the time that the detected signal begins and stops earlier, and the terminal of rethread timing module catches the specific rising edge number of pulse signal, avoids pulse signal to lose the pulse easily in the count to influence the drawback of the final accuracy of testing the speed.
Drawings
The specification includes the following four figures:
fig. 1 is a block diagram of the high-precision water flow velocimeter of the present invention.
Fig. 2 is a circuit diagram of an isolation circuit in a high-precision water flow velocimeter of the present invention.
Fig. 3 is a circuit diagram of a shaping circuit in a high-precision water flow velocimeter of the present invention.
Fig. 4 is the circuit diagram of the timing module in the high-precision water flow velocimeter of the utility model.
The figure shows the part names and the corresponding labels:
the processor comprises a 1 st resistor R1, a 2 nd resistor R2, a 3 rd resistor R3, a 4 th resistor R4, a 5 th resistor R5, a 6 th resistor R6, a 7 th resistor R7, an 8 th resistor R8, a 9 th resistor R9, a 10 th resistor R10, a 1 st transistor Q1, a 1 st processor U1, a 2 nd processor U2, a 3 rd processor U3, a 4 th processor U4, a 5 th processor U5, a 6 th processor U6 and a 7 th processor U7.
Detailed Description
The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings.
As shown in fig. 1, the utility model relates to a rivers tachymeter of high accuracy, including tacho sensor, signal conditioning module, timing module and controller, tacho sensor is used for detecting the velocity of flow, and its output is connected with signal conditioning module input, can handle the pulse signal of tacho sensor's output through signal conditioning module, and signal conditioning module's output is connected with controller and timing module's input, and timing module's control end is connected with the controller, and its output is connected with the controller. When the signal conditioning module outputs a signal to the controller, the controller starts the timing module to start timing the signal output by the signal conditioning module, and outputs a timing result to the controller, and the controller is also connected with an external upper computer PC end through RS485 communication, so that the specific condition of speed measurement can be seen at the PC end. The model of the speed measuring sensor is LS1206B, and the model of the controller is FX1N-24 MT-001.
As shown in fig. 2 and 3, the signal conditioning module includes an isolation circuit and a shaping circuit. The isolation circuit comprises a 1 st resistor R1, a 2 nd resistor R2, a 3 rd resistor R3, a 4 th resistor R4, a 1 st transistor Q1 and a 1 st processor U1. One end of the 1 st resistor R1 is used as the input end of the circuit to be connected with a tachometer sensor, the other end of the 1 st resistor R1 is connected with the base of the 1 st transistor Q1, the collector of the 1 st transistor Q1 is connected with one end of the 2 nd resistor R2, the other end of the 2 nd resistor R2 is connected with external voltage, the emitter of the 1 st transistor Q1 is connected with one end of the 3 rd resistor R3, the other end of the 3 rd resistor R3 is connected with the pin 1 of the 1 st processor U1, the pin 2 and the pin 3 of the 1 st processor U1 are both grounded, the pin 4 of the 1 st processor U1 is connected with one end of the 4 th resistor R4, the other end of the 4 th resistor R4 is connected with external voltage, and the pin 4 of the 1 st processor U1 is also used as the output end of the circuit to be connected with a shaping circuit.
The shaping circuit comprises a No. 2 processor U2, wherein a pin 1 of a No. 2 processor U2 is used as an input end of the circuit and is connected with the shaping circuit, a pin 7 is grounded, a pin 8 is connected with external voltage, a pin 2 is connected with a pin 9 of the circuit, and a pin 10 of the circuit is also used as an output end of the circuit and is connected with a next-stage circuit.
As shown in FIG. 4, the timing module includes a 5 th resistor R5, a 6 th resistor R6, a 7 th resistor R7, an 8 th resistor R8, a 9 th resistor R9, a 10 th resistor R10, a 3 rd processor U3, a 4 th processor U4, a 5 th processor U5, a 6 th processor U6 and a 7 th processor U7. One end of the 5 th resistor R5 is connected to an external voltage, the other end is connected to the pin 4 of the 3 rd processor U3, and the pin 3 of the 3 rd processor U3 is connected to the output end of the shaping circuit and then is connected to the pin 1 of the 4 th processor U4. Pin 7 of the 3 rd processor U3 is grounded, pin 8 is connected to one end of a 7 th resistor R7 and a 9 th resistor R9 and external voltage, the other end of the 9 th resistor R9 is connected to pin 1 of the 3 rd processor U3, and pin 2 of the 3 rd processor U3 is connected to the other end of the 7 th resistor R7 and pin 4 of the 5 th processor U5. The pin 3 of the 5 th processor U5 is grounded, the pin 1 is connected to the other end of the 6 th resistor R6, one end of the 6 th resistor R6 is connected to an external voltage, and the pin 2 of the 5 th processor U5 is connected to the controller as a control end. Pin 6 of the 3 rd processor U3 is connected to pin 2 of the 4 th processor U4 and one end of an 8 th resistor R8; the pin 3 of the 4 th processor U4 is connected to one end of a 10 th resistor R10, the pin 7 of the 4 th processor U4 is grounded, and the pin 8 is connected to an external voltage. The other end of the 8 th resistor R8 is connected to pin 1 of the 6 th processor U6, pin 2 of the 6 th processor U6 and the 7 th processor U7 are grounded, the other end of the 10 th resistor R10 is connected to pin 1 of the 7 th processor U7, and pin 4 of the 6 th processor U6 and the 7 th processor U7 are connected with the controller as the output end of the module.
The utility model discloses a signal conditioning module can carry out the signal shaping with the even pulse signal of the unstability of output in the tacho sensor to the signal impact that prevents the circuit and produce damages that cause the later stage circuit, so that the later stage circuit can normal operating and make output signal be even, and the later stage circuit can obtain clear signal. And the signal conditioning module also isolates the pulse signals output by the velocimeter sensor, so that the isolated circuits are not electrically and directly connected, the safety is improved, the interference caused by external signals can be reduced, and the error of later-stage test results caused by the uncertainty caused by various interference factors in a test field is avoided. The method specifically comprises the following steps: the signal output by the speed sensor is transmitted to the base stage of the 1 st transistor Q1 through the 9 th resistor R9, so that the passing pulse signal is stable through the 1 st transistor Q1, and the damage to a chip caused by interference or impact generated by a circuit can be prevented, thereby playing a role in protection. When the input signal is high frequency, the 1 st transistor Q1 is turned on, its emitter outputs high level to pin 1 of the 1 st processor U1, the 1 st processor U1 input is turned on, its output, pin 3, is turned on and grounded, and pin 4 outputs low level signal, i.e. the pulse signal can be isolated to reduce the circuit interference. And the output signal is transmitted to a shaping circuit, the 2 nd processor U2 can perform reverse triggering on the input pulse signal twice to shape the input pulse signal into a clear and jitter-free pulse signal, and finally the shaped pulse signal is output by the output end of the processor U2.
Because the signal output by the tachometer sensor is a pulse signal, the pulse signal is easy to lose pulses in counting, and whether the pulse counting is accurate or not affects the accuracy of the final measurement. The utility model discloses a mode that timing module adopted twice count, calculate earlier promptly that detected signal begins and stops, the terminal of rethread timing module catches pulse signal's concrete rising edge number, specifically is: the signal for controlling timing is isolated by the 5 th processor U5, the isolated signal is transmitted to the 3 rd processor U3 through the pin 4 of the 5 th processor U5 for processing, the conditioned pulse signal is output to the 6 th processor U6 for isolating again and then output to the high-speed counting port of the controller to realize primary counting, meanwhile, the 3 rd processor U3 outputs the signal to the 4 th processor U4, the pulse signal is subjected to AND processing by the 4 th processor U4 and output to the 7 th processor U7, the signal is isolated again and then output to the other counting port of the PLC to serve as a starting and stopping timing signal of the whole timing module, thereby realizing double timing and improving the timing accuracy of the pulse signal.
Because the start and stop of the detection signal are random, the time interval from the start of the detection signal to the stop of the detection signal and the time interval from the first pulse rising edge to the first pulse rising edge of the stop of the detection signal within a whole pulse period are simultaneously counted in one period, the condition of pulse counting loss is avoided, and the measuring precision is improved.
The above is only used for illustrating the present invention, and the present invention is not limited to the specific structure and application range shown and described, so all the corresponding modifications and equivalents that may be utilized belong to the claimed patent scope of the present invention.
Claims (4)
1. The utility model provides a rivers tachymeter of high accuracy which characterized by: the device comprises a speed measurement sensor, a signal conditioning module, a timing module and a controller; the speed measuring sensor is used for detecting the flow velocity, the output end of the speed measuring sensor is connected with the input end of the signal conditioning module, and the pulse signal output by the speed measuring sensor is processed by the signal conditioning module; the output end of the signal conditioning module is connected with the input ends of the controller and the timing module; the control end of the timing module is connected with the controller, and the output end of the timing module is connected with the controller.
2. A high precision water flow velocimeter as claimed in claim 1, wherein: the signal conditioning module comprises an isolation circuit and a shaping circuit, wherein the isolation circuit comprises a 1 st resistor (R1), a 2 nd resistor (R2), a 3 rd resistor (R3), a 4 th resistor (R4), a 1 st transistor (Q1) and a 1 st processor (U1); one end of the 1 st resistor (R1) is used as the input end of the circuit to be connected with the tachometer sensor, the other end of the 1 st resistor (R1) is connected with the base of the 1 st transistor (Q1), the collector of the 1 st transistor (Q1) is connected with one end of the 2 nd resistor (R2), the other end of the 2 nd resistor (R2) is connected with external voltage, the emitter of the 1 st transistor (Q1) is connected with one end of the 3 rd resistor (R3), the other end of the 3 rd resistor (R3) is connected with the pin 1 of the 1 st processor (U1), the pin 2 and the pin 3 of the 1 st processor (U1) are both grounded, the pin 4 of the 1 st processor (U1) is connected with one end of the 4 th resistor (R4), the other end of the 4 th resistor (R4) is connected with external voltage, and the pin 4 of the 1 st processor (U1) is also used as the output end of the circuit to be connected with the shaping circuit.
3. A high accuracy water flow velocimeter as claimed in claim 2, wherein: the shaping circuit comprises a No. 2 processor (U2), wherein a pin 1 of the No. 2 processor (U2) is used as an input end of the circuit and is connected with the shaping circuit, a pin 7 is grounded, a pin 8 is connected with external voltage, a pin 2 is connected with a pin 9 of the circuit, and a pin 10 of the circuit is also used as an output end of the circuit and is connected with a next-stage circuit.
4. A high precision water flow velocimeter as claimed in claim 1, wherein: the timing module comprises a 5 th resistor (R5), a 6 th resistor (R6), a 7 th resistor (R7), an 8 th resistor (R8), a 9 th resistor (R9), a 10 th resistor (R10), a 3 rd processor (U3), a 4 th processor (U4), a 5 th processor (U5), a 6 th processor (U6) and a 7 th processor (U7); one end of the 5 th resistor (R5) is connected to an external voltage, the other end of the 5 th resistor is connected to a pin 4 of a 3 rd processor (U3), and a pin 3 of the 3 rd processor (U3) is connected with the output end of the shaping circuit and then is connected to a pin 1 of the 4 th processor (U4); the pin 7 of the 3 rd processor (U3) is grounded, the pin 8 is connected to one ends of a 7 th resistor (R7) and a 9 th resistor (R9) and external voltage, the other end of the 9 th resistor (R9) is connected to the pin 1 of the 3 rd processor (U3), and the pin 2 of the 3 rd processor (U3) is connected to the other end of the 7 th resistor (R7) and the pin 4 of the 5 th processor (U5); the pin 3 of the 5 th processor (U5) is grounded, the pin 1 is connected to the other end of the 6 th resistor (R6), one end of the 6 th resistor (R6) is connected with external voltage, and the pin 2 of the 5 th processor (U5) is connected with the controller as a control end; pin 6 of the 3 rd processor (U3) is connected to pin 2 of the 4 th processor (U4) and one end of an 8 th resistor (R8); the pin 3 of the 4 th processor (U4) is connected to one end of a 10 th resistor (R10), the pin 7 of the 4 th processor (U4) is grounded, and the pin 8 is connected with an external voltage; the other end of the 8 th resistor (R8) is connected to pin 1 of the 6 th processor (U6), pin 2 of the 6 th processor (U6) and the 7 th processor (U7) are grounded, the other end of the 10 th resistor (R10) is connected to pin 1 of the 7 th processor (U7), and pin 4 of the 6 th processor (U6) and the 7 th processor (U7) is connected with the controller as the output end of the module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022446748.8U CN213817734U (en) | 2020-10-29 | 2020-10-29 | High-precision water flow velocimeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022446748.8U CN213817734U (en) | 2020-10-29 | 2020-10-29 | High-precision water flow velocimeter |
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| CN213817734U true CN213817734U (en) | 2021-07-27 |
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| CN202022446748.8U Active CN213817734U (en) | 2020-10-29 | 2020-10-29 | High-precision water flow velocimeter |
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| CN (1) | CN213817734U (en) |
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