CN209745998U - Sensor for measuring flow velocity of fluid in pipeline - Google Patents

Abstract

The utility model discloses a sensor for measuring the flow velocity of fluid in a pipeline, which comprises a Hall sensor and a counter for counting the pulse signal output by the Hall sensor, wherein the counter outputs one datum per second; the flow rate control device also comprises a multiplier which multiplies the data output by the counter by a set coefficient to obtain the flow rate; and a display device for displaying the data output from the multiplier. The utility model relates to a flow sensor who simplifies only uses counter and multiplier just to realize the processing of hall sensor output data, simple structure, and is with low costs.

Description

Sensor for measuring flow velocity of fluid in pipeline

Technical Field

The utility model relates to a velocity of flow sensor field, especially a sensor of the interior fluid velocity of flow of measurement pipeline.

Background

The flow rate sensor is widely used, for example, a flow rate sensor for measuring the water flow rate in a tap water pipe exists in a tap water meter, and the water consumption can be calculated according to the water flow rate and the water flow time. In some gasoline stations, a flow sensor is used to measure the amount of fuel to be supplied.

At present, various flow sensors are available, blade type flow sensors are widely used for measuring the flow velocity of fluid in a pipeline, the principle is simple, namely an impeller is arranged in the pipeline, the impeller is rotated by impacting the fluid such as water, oil and the like, and then the flow velocity of the fluid in the pipeline is determined by the rotating speed of the impeller. Chinese patent publication No. 102792131B discloses a device for measuring the flow of a fluid, providing an innovative solution for more accurate measurement of the flow rate of at least one fluid, in particular at least one liquid, in at least one conduit. The measuring device includes: at least one bladed impeller mounted in a conduit so as to be rotationally driven by the fluid flow and to which at least one magnet is fixed, and at least one magnetic field sensor provided in a fixed position close to the conduit and capable of causing a signal or pulse to be emitted each time the magnet of said impeller passes by its side; the arrangement being such that the number of signals or pulses generated by the sensor over a period of time is indicative of the flow rate of fluid in the associated conduit according to a predetermined relationship; and wherein said at least one magnetic field sensor is coupled to processing and control circuitry comprising a microprocessor having associated memory means predisposed to process signals emitted by said at least one sensor in a predetermined manner and to provide digital output signals having at least one characteristic that varies with the flow rate of fluid in said associated conduit; wherein the relationship between the number of pulses of the sensor and the flow rate of the fluid in the conduit is non-linear, the memory device storing calibration data with which the ratio of the flow rate value to the corresponding number of pulses emitted by the sensor is variable as the flow rate of the fluid in the conduit changes so as to compensate for the non-linearity of the relationship; the device is characterized in that the microprocessor-operated processing and control circuit is predisposed to provide at its output a digital signal having a modulated pulse width or duration, one characteristic of which varies in a substantially linear manner with the flow rate of the fluid in the conduit.

For general users, only basic measurement and calculation are needed for the flow rate or the flow rate of fluid in a pipeline, such as tap water in a tap water pipe, and if the flow meter is adopted, the cost is multiplied, and the requirements of the users cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a to present flow sensor with high costs can not satisfy the user to the needs of simple and easy measurement flow, provide a sensor of the fluid velocity in the measurement pipeline.

The utility model discloses a realize that the technical scheme that its technical purpose adopted is: a sensor for measuring the flow rate of fluid in a pipeline comprises a Hall sensor and a counter for counting pulse signals output by the Hall sensor, wherein the counter outputs data every second; the flow rate control device also comprises a multiplier which multiplies the data output by the counter by a set coefficient to obtain the flow rate; and a display device for displaying the data output from the multiplier.

The utility model relates to a flow sensor who simplifies only uses counter and multiplier just to realize the processing of hall sensor output data, simple structure, and is with low costs.

Further, in the sensor for measuring a flow rate of fluid in the pipe, the sensor includes: the counter is realized by a CPU, a receiving pin of the CPU receives a pulse signal output by the Hall sensor, program interruption occurs when the pulse signal is switched off to on, then counting is carried out, and the counting is read by the CPU at the internal timing of 1 second.

Further, in the sensor for measuring a flow rate of fluid in the pipe, the sensor includes: the CPU adopts a singlechip with the model of STC15W204S, the Hall sensor is arranged on a pipeline of the flow velocity of the fluid to be measured, an OUT pin of the Hall sensor is connected with an INT1 pin of the singlechip, and a lead connected with the OUT pin of the Hall sensor and the INT1 pin of the singlechip is also connected with a working power supply through a pull-up resistor R1.

Further, in the sensor for measuring a flow rate of fluid in the pipe, the sensor includes: the system also comprises a communication device for uploading the detected flow data to a background, wherein the communication device comprises a wireless communication module; the output signals of the TXD pin and the RXD pin of the singlechip are connected with the RXD port and the TXD port of the wireless communication module through a communication interface J1 by a low-power consumption transceiver with the model number of MAX3485, and the P1.1 pin of the singlechip is connected with an output enabling pin of the low-power consumption transceiver; and the output signal of the P1.2 pin of the singlechip is used as the awakening signal of the wireless communication module.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a structure diagram of the flow sensor of the present invention.

Fig. 2 is a schematic block diagram of the data processing of the flow sensor of the present invention.

Fig. 3 is a schematic diagram of embodiment 1 of the present invention, which adopts a single chip to implement data processing.

Fig. 4 is a diagram of the single chip microcomputer and peripheral circuits in embodiment 1 of the present invention.

Fig. 5 is the interface between the single chip microcomputer and the wireless communication module according to embodiment 1 of the present invention.

Detailed Description

Embodiment 1, as shown in fig. 1, this embodiment is a flow sensor installed in the middle of a tap water pipe for measuring the flow rate of tap water in the tap water pipe, and the flow sensor has a housing 100 having a mouthpiece 101 provided at both ends thereof to be connected to the tap water pipe, and in practice, this housing 100 is similar to a small section of a general tap water pipe. The impeller 102 is installed in the shell 100, when water flows through the shell 100 installed in the middle of a tap water pipe, the impeller rotates alternately, a magnetic field sensor is installed on the impeller 102, practically, the magnetic field sensor is a small magnet block 103 which is fixed on the impeller 102 and can rotate along with the impeller 102, a Hall sensor 104 is installed outside the shell 100 and used for sensing the magnet block 103, the Hall sensor 104 is the same as all the Hall sensors and senses the magnetic field intensity, when the magnetic field intensity is increased from weak to strong for a period, a pulse signal is generated and output, the pulse signal can represent the rotation of the impeller for one circle, and the frequency of the pulse signal represents the rotation speed of the impeller.

In this embodiment, the pulse signal output by the hall sensor is processed, and the flow rate of the tap water in the tap water pipe can be obtained. In this embodiment, the circuit for processing the pulse signal output by the hall sensor is simple, only two devices can be used as shown in fig. 2, one is a counter for counting the pulse signal output by the hall sensor, the counter outputs a count data every 1 second, and then the counter is emptied, so that the frequency of the pulse signal, that is, the number of revolutions of the impeller per second is output, since the cross section of the pipe where the impeller is located, that is, the cross section of the water flow place in the flow sensor housing is known, the flow rate can be calculated according to the formula in the art, in fact, the flow rate and the frequency of the rotation of the impeller have a corresponding relationship, that is, within a certain flow rate range, a substantially linear relationship, so that the embodiment further has a multiplier, in which the flow rate of the water in the water pipe per second can be obtained by multiplying the data output by the counter by a set coefficient, and then the flow rate of the water is obtained. If one leaves this range, the calculated tap water flow rate will have a small error, the error being larger the further it leaves this range. Since the flow velocity of the fluid in the pipe measured by the sensor for measuring the flow velocity of the fluid in the pipe according to the embodiment is generally within a certain range, a coefficient K can be used to multiply the pulse frequency, which is simplified, so as to reduce the cost. A display device is used to display the output of the multiplier, i.e., the detected flow value.

In this embodiment, the coefficient K may be calculated by comparing with a standard flowmeter, for example, the casing shown in fig. 1 of this embodiment and the standard flowmeter are installed in a section of tap water pipe in series, and the flow rate measured by the standard flowmeter is compared with the number output by the counter per second to obtain the coefficient K.

Specifically, in this embodiment, a CPU, that is, a single chip microcomputer is used to implement a counter and a multiplier, as shown in fig. 3, which is a schematic block diagram, and specific circuit board diagrams are shown in fig. 4 and 5.

In this embodiment, a CPU implementing the counter is a single chip microcomputer of type STC15W204S, a receiving pin (interrupt receiving port) of the single chip microcomputer of STC15W204S receives a pulse signal output by the hall sensor, when a pulse signal period is received, a program interrupt occurs when the signal is turned off to on, that is, a rising edge of the pulse signal is detected, and the count is read at a timing of 1 second inside the CPU. The function of the counter is realized, in practice, counting pulse signals by utilizing the interrupt input of the single chip microcomputer is a commonly used counting method in the field, and in other embodiments, counting can be carried out by detecting a falling edge as soon as the falling edge is detected, and the same technical effect can be achieved. In order to detect the frequency of the pulse signal, a relatively simple method is adopted in the trade, namely, a timer is used, a counter outputs a counting result every second, and the counting is reset and cleared. Thus, the counter outputs a frequency number, actually, the impeller 102 is in the tap water pipe, the impeller 102 is driven to rotate by the flowing of tap water in the tap water pipe, the induction magnet block 103 on the impeller 102 rotates along with the impeller 102, the hall sensor 104 fixedly installed on the outer side of the tap water pipe generates a pulse signal by detecting the strength of the induction magnet block 103, the induction magnet block 103 rotates along with the impeller 102 for a circle, and the hall sensor 104 outputs a pulse signal, actually, when the tap water in the tap water pipe flows, generally, after the tap water starts to flow, the flow rate is basically stable without large fluctuation, therefore, the impeller 102 basically rotates at a constant speed in the flowing process of the tap water, thus, the pulse signal output by the hall sensor 104 is also uniform, when in calibration, the standard flow meter is used for measuring the flow rate of fluid in the pipeline with basically consistent flow rate, the coefficient K multiplied by the multiplier in the present embodiment can be determined more accurately. In this embodiment, the multiplier is implemented inside a single chip microcomputer with the model of STC15W 204S. Thus, the flow sensor in this embodiment outputs a substantially steady flow value.

In this embodiment, the hall sensor is not on a circuit board with a single chip microcomputer with model STC15W204S, the hall sensor is generally installed on a small circuit board on a water pipe, a power source VCC is needed to be supplied by a power source installed on a single chip microcomputer mainboard with model STC15W204S, in addition, the ground is also coupled with a ground installed on the single chip microcomputer mainboard with model STC15W204S, an output end OUT of the hall sensor is led to the single chip microcomputer mainboard through a route interface, at this time, a pull-up resistor R1 is used to pull up the output end OUT of the hall sensor to VCC and then input the VCC to an interrupt pin of the single chip microcomputer with model STC15W204S, in this embodiment, INT0 is used, after counting and multiplication are performed in the single chip microcomputer, and then output by TXD of the single chip microcomputer, in this embodiment, a wireless communication module is used to transmit TXD signals of the single chip microcomputer, and TXD and RXD pin output signals of the single chip microcomputer are connected to RXD and RXD ports of the wireless communication module through a communication interface J1 by, the P1.1 pin of the singlechip is connected with an output enabling pin of the low-power transceiver; fig. 5 shows an output signal of the P1.2 pin of the single chip as a wake-up signal of the wireless communication module.

Claims (4)

1. The utility model provides a measure sensor of fluid velocity of flow in pipeline, includes hall sensor, its characterized in that: the device also comprises a counter for counting the pulse signals output by the Hall sensor, wherein the counter outputs one datum every second; the flow rate control device also comprises a multiplier which multiplies the data output by the counter by a set coefficient to obtain the flow rate; and a display device for displaying the data output from the multiplier.

2. A sensor for measuring the flow rate of a fluid in a conduit as defined in claim 1, wherein: the counter is realized by a CPU, a receiving pin of the CPU receives a pulse signal output by the Hall sensor, program interruption occurs when the pulse signal is switched off to on, then counting is carried out, and the counting is read by the CPU at the internal timing of 1 second.

3. A sensor for measuring the flow rate of a fluid in a conduit as claimed in claim 2, wherein: the CPU adopts a singlechip with the model of STC15W204S, the Hall sensor is arranged on a pipeline of the flow velocity of the fluid to be measured, an OUT pin of the Hall sensor is connected with an INT1 pin of the singlechip, and a lead connected with the OUT pin of the Hall sensor and the INT1 pin of the singlechip is also connected with a working power supply through a pull-up resistor R1.

4. A sensor for measuring the flow rate of a fluid in a conduit as claimed in claim 3, wherein: the system also comprises a communication device for uploading the detected flow data to a background, wherein the communication device comprises a wireless communication module; the output signals of the TXD pin and the RXD pin of the singlechip are connected with the RXD port and the TXD port of the wireless communication module through a communication interface J1 by a low-power consumption transceiver with the model number of MAX3485, and the P1.1 pin of the singlechip is connected with an output enabling pin of the low-power consumption transceiver; and the output signal of the P1.2 pin of the singlechip is used as the awakening signal of the wireless communication module.