Flowmeter

Abstract

The utility model provides a flowmeter which comprises a water level detection circuit, a radar speed measurement circuit, an ultrasonic speed measurement circuit and a control output circuit, and the water level detection circuit respectively outputs a first water level detection signal and a second water level detection signal when detecting that the water level of a pipeline is above or below a water level threshold value; the control output circuit correspondingly controls the radar speed measurement circuit or the ultrasonic speed measurement circuit to be powered on to work and detect the flow velocity of the pipeline, and meanwhile, the control output circuit receives corresponding flow velocity detection signals, so that the flow velocity and the flow of the pipeline are determined, and data are uploaded to an upper computer through the communication circuit. The radar velocity measurement circuit measures the flow velocity of a low water level, the ultrasonic velocity measurement circuit measures the flow velocity of a high water level, and radar waves or ultrasonic waves are switched according to different water levels, so that the flow velocity measurement is realized, the scenes of radar wave velocity measurement and ultrasonic velocity measurement are compatible, and the flow velocity measurement efficiency is improved. And the installation cost of a plurality of devices and the overall power consumption of the flowmeter are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of flow meters, and in particular relates to a flow meter. Background Art

[0002] Flow meters are often used to detect and obtain the flow velocity and flow rate inside the pipeline. There are generally two types of equipment used for municipal sewer flow detection on the market. The first type is the ultrasonic Doppler flow meter. When the water level is lower than the height of the ultrasonic probe, ultrasonic flow velocity measurement cannot be achieved. At the same time, since it is installed at the bottom of the pipeline, it causes garbage blockage and requires a high frequency of daily maintenance. The second type is the radar flow meter. Since the radar flow meter is a non-contact measurement, it is generally installed near the top of the pipeline. When the pipeline is full and the equipment is immersed in water, the radar wave cannot measure the velocity underwater.

[0003] In order to solve the above problems, the existing flow meter is synchronously set with a radar flow meter and an ultrasonic Doppler flow meter. The radar velocity measurement and ultrasonic test are run simultaneously to obtain the flow velocity at different water levels in the pipeline.

[0004] However, since radar speed measurement and ultrasonic speed measurement are running at the same time, the power consumption of the equipment is increased, and two different flow meters need to be set up, which increases the design cost. In addition, the flow meter data needs to be checked on site frequently, which increases the number of times and costs for manual visits to the site to check the equipment. Utility Model Content

[0005] The utility model aims to provide a flow meter, aiming to solve the problems of high power consumption and high cost of traditional flow meters.

[0006] A first aspect of an embodiment of the utility model provides a flow meter for measuring and determining a flow velocity and a flow rate of a pipeline, the flow meter comprising:

[0007] a water level detection circuit, used to detect the water level of the pipeline, and output a first water level detection signal when the water level does not exceed the water level threshold, and output a second water level detection signal when the water level exceeds the water level threshold;

[0008] A radar speed measuring circuit, used for detecting the flow velocity of the pipeline when powered on, and outputting a first flow velocity detection signal;

[0009] An ultrasonic velocity measuring circuit, used for detecting the flow velocity of the pipeline when powered on, and outputting a second flow velocity detection signal;

[0010] a control output circuit, connected to the water level detection circuit, the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and outputting working power to the radar speed measurement circuit when triggered by the first water level detection signal, and outputting working power to the ultrasonic speed measurement circuit when triggered by the second water level detection signal;

[0011] and obtaining and determining the flow velocity and flow rate of the pipeline according to the first flow velocity detection signal or the second flow velocity detection signal;

[0012] The communication circuit is connected to the control output circuit and the host computer respectively to transmit data and / or instructions.

[0013] Optionally, the water level detection circuit comprises:

[0014] A radar ranging circuit, connected to the control output circuit, for detecting the water level of the pipeline and outputting a first water level detection signal when the water level does not exceed a water level threshold;

[0015] A pressure water level gauge is connected to the control output circuit, and is used to detect the water level of the pipeline and output a second water level detection signal when the water level exceeds a water level threshold.

[0016] Optionally, the flow meter further comprises:

[0017] The shell, the pressure water level gauge, the ultrasonic speed measurement circuit, the radar speed measurement circuit and the radar distance measurement circuit are sequentially arranged at intervals along the direction of water level rise.

[0018] Optionally, the control output circuit includes:

[0019] a power output circuit, connected to the water level detection circuit, the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and outputting working power to the radar speed measurement circuit when triggered by the first water level detection signal, and outputting working power to the ultrasonic speed measurement circuit when triggered by the second water level detection signal;

[0020] The controller is connected to the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and is used to obtain and determine the flow velocity and flow rate of the pipeline according to the first flow velocity detection signal or the second flow velocity detection signal.

[0021] Optionally, the control output circuit includes:

[0022] A power output circuit, connected to the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and triggered by a first enable signal to output a working power supply to the radar speed measurement circuit, and triggered by a second enable signal to output a working power supply to the ultrasonic speed measurement circuit;

[0023] a controller connected to the power output circuit, the water level detection circuit, the radar speed measurement circuit and the ultrasonic speed measurement circuit, respectively, the controller being triggered by the first water level detection signal to output the first enable signal and being triggered by the second water level detection signal to output the second enable signal;

[0024] The flow velocity and flow rate of the pipeline are determined according to the first flow velocity detection signal or the second flow velocity detection signal.

[0025] Optionally, the power output circuit includes:

[0026] A first voltage stabilizing circuit is connected to the control output circuit and the radar speed measuring circuit, is triggered to conduct by the first water level detection signal or the first enable signal, and outputs working power to the radar speed measuring circuit;

[0027] The second voltage stabilizing circuit is connected to the control output circuit and the ultrasonic speed measuring circuit, is triggered to conduct by the second water level detection signal or the second enable signal, and outputs working power to the ultrasonic speed measuring circuit.

[0028] Optionally, the power output circuit includes:

[0029] A third voltage stabilizing circuit, used for outputting working power;

[0030] A first switch circuit is connected between the third voltage stabilizing circuit and the radar speed measuring circuit, is triggered to conduct by the first water level detection signal or the first enable signal, and outputs working power to the radar speed measuring circuit;

[0031] The second switch circuit is connected between the third voltage stabilizing circuit and the ultrasonic speed measuring circuit, is triggered to conduct by the second water level detection signal or the second enable signal, and outputs working power to the ultrasonic speed measuring circuit.

[0032] Optionally, the communication circuit includes a wireless communication circuit and / or a wired communication circuit.

[0033] Optionally, the flow meter further comprises:

[0034] A gyroscope is connected to the control output circuit or the communication circuit, and is used to collect the three-axis coordinates of the flow meter and output coordinate data.

[0035] Optionally, the flow meter further comprises:

[0036] A temperature sensor is connected to the control output circuit or the communication circuit, and is used to collect the temperature of the flow meter and output temperature data.

[0037] Compared with the prior art, the beneficial effects of the embodiments of the utility model are as follows: the above-mentioned flow meter includes a water level detection circuit, a radar speed measurement circuit, an ultrasonic speed measurement circuit and a control output circuit. When the water level in the pipeline is detected to be above or below the water level threshold, the water level detection circuit outputs a first water level detection signal and a second water level detection signal respectively. The control output circuit controls the radar speed measurement circuit or the ultrasonic speed measurement circuit to power on and detect the pipeline flow velocity respectively. At the same time, the control output circuit receives the corresponding flow velocity detection signal, thereby determining the pipeline flow velocity and flow rate and uploading the data to the host computer through the communication circuit, reducing the number of manual checks and costs. The radar speed measurement circuit measures the flow velocity at low water levels, and the ultrasonic speed measurement circuit measures the flow velocity at high water levels. Radar waves or ultrasonic waves are switched according to different water levels to achieve flow velocity measurement while being compatible with radar wave speed measurement and ultrasonic speed measurement scenarios, reducing the installation cost of multiple devices and the overall power consumption of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 A schematic diagram of a first module of a flow meter provided by an embodiment of the utility model;

[0040] Figure 2 A schematic diagram of a second module of a flow meter provided in an embodiment of the utility model;

[0041] Figure 3 A schematic diagram of the structure of a flow meter provided in an embodiment of the utility model;

[0042] Figure 4 A third module schematic diagram of a flow meter provided in an embodiment of the utility model;

[0043] Figure 5 A fourth module schematic diagram of a flow meter provided in an embodiment of the utility model;

[0044] Figure 6 A schematic diagram of a module of a radar ranging circuit provided by an embodiment of the utility model;

[0045] Figure 7 A schematic diagram of a module of a radar speed measurement circuit provided in an embodiment of the utility model;

[0046] Figure 8 A schematic diagram of a module of an ultrasonic velocity measurement circuit provided in an embodiment of the utility model;

[0047] Fig. 9 A schematic diagram of a first module of a power output circuit provided by an embodiment of the utility model;

[0048] Fig.10 A second module schematic diagram of a power output circuit provided by an embodiment of the utility model;

[0049] Fig.11 A fifth module schematic diagram of the flow meter provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0052] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] A first aspect of an embodiment of the utility model provides a flow meter for measuring flow velocity and flow rate in a pipeline.

[0055] like Figure 1 As shown, in this embodiment, the flow meter includes:

[0056] The water level detection circuit 10 is used to detect the water level of the pipeline and output a first water level detection signal L1 when the water level does not exceed the water level threshold, and output a second water level detection signal H1 when the water level exceeds the water level threshold;

[0057] The radar speed measuring circuit 20 is used to detect the flow velocity of the pipeline when powered on and output a first flow velocity detection signal S1;

[0058] The ultrasonic velocity measuring circuit 30 is used to detect the flow velocity of the pipeline when powered on, and output a second flow velocity detection signal S2;

[0059] The control output circuit 40 is respectively connected to the water level detection circuit 10, the radar speed measurement circuit 20 and the ultrasonic speed measurement circuit 30, and is triggered by the first water level detection signal L1 to output the working power VCC to the radar speed measurement circuit 20, and is triggered by the second water level detection signal H1 to output the working power VCC to the ultrasonic speed measurement circuit 30;

[0060] and obtaining and determining the flow velocity and flow rate of the pipeline according to the first flow velocity detection signal S1 or the second flow velocity detection signal S2;

[0061] The communication circuit 50 is connected to the control output circuit 40 and the host computer respectively to transmit data and / or instructions.

[0062] In this embodiment, when the flow velocity and flow rate of the pipeline are detected, the water level detection circuit 10 first performs water level detection. When the pipeline is not full, the water level detected by the water level detection circuit 10 does not exceed the water level threshold, and the water level detection circuit 10 outputs a first water level detection signal L1. At this time, it switches to radar flow velocity measurement, and the first water level detection signal L1 is output to the control output circuit 40. The control output circuit 40 triggers the output of the working power supply VCC to the radar speed measurement circuit 20, and ends the output of the working power supply VCC to the ultrasonic speed measurement circuit 30. The radar speed measurement circuit 20 operates normally, and the radar speed measurement circuit 20 sends an electromagnetic wave signal, and determines the flow velocity data according to the frequency change of the returned electromagnetic wave signal, and outputs the first flow velocity detection signal S1 to the control output circuit 40. The control output circuit 40 monitors the flow velocity data of the pipeline and determines the flow rate data of the pipeline in real time according to the first flow velocity detection signal S1 of the radar speed measurement circuit 20, and sends the flow velocity and flow rate data to the host computer through the communication circuit 50.

[0063] When the water level exceeds the water level threshold or the pipe is full, the water level detection circuit 10 switches to output the second water level detection signal H1. At this time, it switches to ultrasonic flow velocity measurement, and the second water level detection signal H1 is output to the control output circuit 40. The control output circuit 40 triggers the output of the working power VCC to the ultrasonic velocity measurement circuit 30, and ends the output of the working power VCC to the radar velocity measurement circuit 20. The ultrasonic velocity measurement circuit 30 operates normally and monitors the flow velocity data of the pipeline in real time. The ultrasonic velocity measurement circuit 30 uses the Doppler principle to emit an ultrasonic signal. When the ultrasonic signal encounters the flowing water, the frequency of the returned ultrasonic signal shifts. The greater the flow velocity, the greater the frequency shift of the ultrasonic signal, and vice versa. The flow velocity of the current pipeline is determined according to the frequency shift of the ultrasonic wave, and the second flow velocity detection signal S2 is output to the control output circuit 40. The control output circuit 40 determines the flow velocity and flow data of the pipeline according to the second flow velocity detection signal S2 of the ultrasonic velocity measurement circuit 30, and sends the flow velocity and flow data to the host computer through the communication circuit 50.

[0064] The control output circuit 40 obtains the real-time water level data of the current pipeline, calculates the cross-sectional area of ​​the fluid according to the shape of the pipeline, and obtains the real-time flow rate of the pipeline at the same time, and determines the current real-time flow rate by the formula that flow rate equals area multiplied by flow rate.

[0065] The flow meter switches the radar speed measuring circuit 20 and the ultrasonic speed measuring circuit 30 to work separately according to different water levels. The radar speed measuring circuit 20 and the ultrasonic speed measuring circuit 30 do not need to work at the same time, which reduces the overall power consumption of the flow meter. At the same time, a communication circuit 50 is set up to send data such as water level, flow velocity, and flow rate to the host computer. The inspection personnel can view the data of the current pipeline through the host computer without on-site inspection, which reduces the number and cost of manual inspections.

[0066] The water level detection circuit 10 may adopt corresponding radar ranging modules, electrode sheets and other structures. In an optional embodiment, as shown in FIG. Figure 2 As shown, the water level detection circuit 10 includes:

[0067] The radar ranging circuit 11 is connected to the control output circuit 40, and is used to detect the water level of the pipeline and output a first water level detection signal L1 when the water level does not exceed the water level threshold;

[0068] The pressure water level gauge 12 is connected to the control output circuit 40, and is used to detect the water level of the pipeline, and output a second water level detection signal H1 when the water level exceeds a water level threshold.

[0069] In this embodiment, the pressure water level gauge 12 and the radar ranging circuit 11 are arranged in sequence at intervals along the direction of rising water level. The radar ranging circuit 11 is arranged toward the water body. When the water level exceeds the pressure water level gauge 12, the pressure water level gauge 12 outputs a signal and outputs a second water level detection signal H1 when the water level exceeds the water level threshold.

[0070] When the pipeline is not full, the water level does not exceed the water level threshold, the water level does not exceed the pressure water level gauge 12, or the water level exceeds the pressure water level gauge 12 but the water pressure does not reach the preset pressure, the pressure water level gauge 12 outputs a detection signal different from the second water level detection signal H1. At this time, the radar ranging circuit 11 detects the water level. The radar ranging circuit 11 transmits a radio frequency signal toward the surface of the water body and receives an echo signal. After internal mixing and amplification, an intermediate frequency signal is obtained. The distance information is determined according to the frequency of the intermediate frequency signal. When the water level of the pipeline does not exceed the water level threshold, the radar ranging circuit 11 outputs a first water level detection signal L1. At this time, it switches to radar flow velocity measurement, and the first water level detection signal L1 is output to the control output circuit 40. When the control output circuit 40 receives the first water level detection signal L1 and does not receive the second water level detection signal H1, it triggers the output of the working power VCC to the radar speed measurement circuit 20, and stops outputting the working power VCC to the ultrasonic speed measurement circuit 30. The radar speed measurement circuit 20 operates normally, and the radar speed measurement circuit 20 sends an electromagnetic wave signal, and determines the flow rate data according to the frequency change of the returned electromagnetic wave signal, and outputs the first flow rate detection signal S1 to the control output circuit 40. The control output circuit 40 monitors the flow rate data of the pipeline in real time and determines the flow rate data of the pipeline according to the first flow rate detection signal S1 of the radar speed measurement circuit 20, and sends the flow rate and flow rate data to the host computer through the communication circuit 50.

[0071] When the water level exceeds the water level threshold or the pipe is full, the distance between the radar ranging circuit 11 and the water surface is very small or zero, and the transmission and reception time of the transmitted RF signal and the echo signal cannot be measured. At this time, the radar ranging circuit 11 outputs a detection signal different from the first water level detection signal L1, and the value of the detection signal may be zero. The water level exceeds the pressure water level gauge 12, and the water pressure reaches the preset pressure. The pressure water level gauge 12 outputs the second water level detection signal H1. At this time, it switches to ultrasonic flow velocity measurement, and the second water level detection signal H1 is output to the control output circuit 40. When the control output circuit 40 does not receive the first water level detection signal L1 and receives the second water level detection signal H1, it triggers the output of the working power supply VCC to the ultrasonic velocity measurement circuit 3 0, and ends the output of the working power supply VCC to the radar speed measurement circuit 20, the ultrasonic speed measurement circuit 30 operates normally, and monitors the flow velocity data of the pipeline in real time. The ultrasonic speed measurement circuit 30 uses the Doppler principle to transmit an ultrasonic signal. When the ultrasonic signal encounters the flowing water, the frequency of the returned ultrasonic signal shifts. The greater the flow velocity, the greater the frequency shift of the ultrasonic signal, and vice versa. The flow velocity of the current pipeline is determined according to the frequency shift of the ultrasonic wave, and a second flow velocity detection signal S2 is output to the control output circuit 40. The control output circuit 40 determines the flow velocity and flow data of the pipeline according to the second flow velocity detection signal S2 of the ultrasonic speed measurement circuit 30, and sends the flow velocity and flow data to the host computer through the communication circuit 50.

[0072] The radar ranging circuit 11 can adopt corresponding structures such as radio frequency transmitting circuit and radio frequency receiving circuit. In an optional embodiment, the radar ranging circuit 11 is also connected to the control output circuit 40. Figure 6 As shown, the radar ranging circuit 11 includes a frequency sweeping circuit 111, a radar chip 112, an antenna 113, a differential amplifier circuit 114 and a low-noise amplifier circuit 115. The frequency sweeping circuit 111 and the low-noise amplifier circuit 115 are respectively connected to the control output circuit 40, the frequency sweeping circuit 111, the differential amplifier circuit 114 and the antenna 113 are respectively connected to the radar chip 112, and the differential amplifier circuit 114 is also connected to the low-noise amplifier circuit 115.

[0073] When the radar ranging circuit 11 is working, the control output circuit 40 outputs a first ranging control signal, the sweeping frequency circuit 111 converts the first ranging control signal into a sweeping frequency voltage signal, the sweeping frequency voltage signal is converted into a radio frequency signal by the radar chip 112, and is transmitted to the water body through the antenna 113, and the echo signal reflected back by the water body is output to the antenna 113 and the radar chip 112, and after mixing, intermediate frequency filtering and amplification by the radar chip 112, the intermediate frequency differential signal is output to the differential amplifier circuit 114 and the low noise amplifier circuit 115, and a stable intermediate frequency signal is obtained after differential amplification and low noise amplification. The control output circuit 40 obtains the corresponding detection distance according to the intermediate frequency signal, and controls the radar speed measurement circuit 20 or the ultrasonic speed measurement circuit 30 to power on and work accordingly.

[0074] The pressure water level gauge 12 detects the water level pressure. When there is no water in the pipeline, the output value of the pressure water level gauge 12 is zero. When the pressure water level gauge 12 is submerged, the pressure changes accordingly. The pressure water level gauge 12 outputs a corresponding pressure signal according to the water level, and when the water level exceeds the preset water level, it outputs a preset pressure signal of matching size, that is, outputs a second water level detection signal H1.

[0075] The radar speed measurement circuit 20 can use a corresponding transmitting board, receiving circuit, etc. In an optional embodiment, as Figure 7 As shown, the radar speed measurement circuit 20 includes a radar board 21 and a first filtering and amplifying circuit 22. The control output circuit 40, the radar board 21 and the first filtering and amplifying circuit 22 are connected in sequence. The radar speed measurement circuit 20 applies the Doppler effect. The control output circuit 40 controls the radar board 21 to power on and outputs an electromagnetic wave signal of a corresponding frequency to the radar board 21. The radar board 21 outputs an intermediate frequency signal and receives the reflected electromagnetic wave signal. When the emitted electromagnetic wave signal encounters a moving object, the frequency of the reflected electromagnetic wave signal changes. The reflected electromagnetic wave signal is amplified by the first filtering and amplifying circuit 22 and output to the control output circuit 40. The control output circuit 40 obtains the corresponding flow velocity information according to the received electromagnetic wave signal.

[0076] The ultrasonic velocity measurement circuit 30 uses the Doppler principle to determine the flow velocity according to the deviation of the signal frequency. In an optional embodiment, the ultrasonic velocity measurement circuit 30 includes a clock generator 31, an isolation driver 32, a transformer 33, an ultrasonic transmitting probe 34, an ultrasonic receiving probe 35, a second filter amplifier circuit 36, a mixer 37 and a low-pass filter circuit 38. The clock generator 31 is connected to the control output circuit 40, the isolation driver 32 and the mixer 37 respectively. The isolation driver 32, the transformer 33 and the ultrasonic transmitting probe 34 are connected in sequence. The ultrasonic transmitting probe 34 and the ultrasonic receiving probe 35 are arranged at a relative interval. The ultrasonic receiving probe 35, the second filter amplifier circuit 36, the mixer 37, the low-pass filter circuit 38 and the control output circuit 40 are connected in sequence. The control output circuit 40 outputs a working power supply V CC to the corresponding circuit module inside the ultrasonic speed measurement circuit 30, and at the same time, output a clock enable signal to the clock generator 31, the clock generator 31 outputs a transmission signal to the isolation driver 32, and outputs a mixing signal to the mixer 37. The transmission signal is isolated and amplified by the isolation driver 32 and the transformer 33 in turn, and then outputs a boosted AC voltage signal, that is, an ultrasonic signal. The AC voltage signal is transmitted to the water body through the ultrasonic transmitting probe 34, and the ultrasonic receiving probe 35 receives the reflected ultrasonic frequency shift signal, and after filtering and amplification by the second filtering and amplifying circuit 36, it is output to the mixer 37. The ultrasonic mixing signal is mixed with the mixing signal to output a zero-frequency signal, and the frequency signal is obtained after the high-frequency clutter is filtered out by the low-pass filtering circuit 38. The control output circuit 40 determines the flow velocity and flow rate of the pipeline according to the frequency signal.

[0077] The probes and radar panels 21 of each module are correspondingly arranged on the water level gauge. In an optional embodiment, as Figure 3 As shown, the flow meter also includes:

[0078] The housing, the pressure water level gauge 12, the ultrasonic velocity measuring circuit 30, the radar velocity measuring circuit 20 and the radar distance measuring circuit 11 are sequentially arranged at intervals along the direction of water level rise.

[0079] In this embodiment, the pressure water level gauge 12 is at the low water level position of the pipeline, and the radar ranging circuit 11 is at the high water level position of the pipeline. When the pipeline is not full, the water level does not exceed the water level threshold, the water level does not exceed the pressure water level gauge 12, or the water level exceeds the pressure water level gauge 12 but the water pressure does not reach the preset pressure, the pressure water level gauge 12 does not output a signal. At this time, the radar ranging circuit 11 detects the water level, and the radar ranging circuit 11 transmits a radio frequency signal toward the surface of the water body and receives an echo signal. After internal mixing and amplification, an intermediate frequency signal is obtained, and the distance information is determined according to the frequency of the intermediate frequency signal. At this time, switch to radar flow velocity measurement.

[0080] When the water level exceeds the water level threshold or the pipe is full, the distance between the radar ranging circuit 11 and the water surface is zero or very small. At this time, the radar ranging circuit 11 does not output the first water level detection signal L1, and the water level exceeds the pressure water level gauge 12, and the water pressure reaches the preset pressure. The pressure water level gauge 12 outputs the second water level detection signal H1. At this time, switch to ultrasonic flow rate measurement.

[0081] The control output circuit 40 may use a corresponding power supply circuit, a controller 42, etc. In an optional embodiment, as Figure 4 As shown, the control output circuit 40 includes:

[0082] The power output circuit 41 is respectively connected to the water level detection circuit 10, the radar speed measurement circuit 20 and the ultrasonic speed measurement circuit 30, and is triggered by the first water level detection signal L1 to output the working power VCC to the radar speed measurement circuit 20, and is triggered by the second water level detection signal H1 to output the working power VCC to the ultrasonic speed measurement circuit 30;

[0083] The controller 42 is connected to the radar speed measuring circuit 20 and the ultrasonic speed measuring circuit 30 respectively, and is used to obtain and determine the flow velocity and flow rate of the pipeline according to the first flow velocity detection signal S1 or the second flow velocity detection signal S2.

[0084] In this embodiment, the power output circuit 41 is used to realize the control output of the working power supply VCC, and the controller 42 is used to determine the flow velocity and flow rate of the pipeline according to the received flow velocity detection signal.

[0085] When the water level does not exceed the water level threshold, the radar ranging circuit 11 outputs the first water level detection signal L1, the power output circuit 41 is controlled to output the working power VCC to the radar speed measurement circuit 20, the radar speed measurement circuit 20 is powered on and performs flow velocity detection.

[0086] When the water level exceeds the water level threshold, the pressure water level gauge 12 outputs a second water level detection signal H1, and the power output circuit 41 outputs the working power VCC to the ultrasonic velocity measurement circuit 30, and the ultrasonic velocity measurement circuit 30 performs flow velocity detection.

[0087] When detecting different water levels and different flow rates, the controller 42 receives the flow rate detection signal output by the radar speed measurement circuit 20 or the ultrasonic speed measurement circuit 30, and determines the flow rate and flow volume of the pipeline according to the flow rate detection signal.

[0088] In another alternative embodiment, if Figure 5 As shown, the control output circuit 40 includes:

[0089] The power output circuit 41 is connected to the radar speed measuring circuit 20 and the ultrasonic speed measuring circuit 30 respectively, and is triggered by the first enable signal EN1 to output the working power VCC to the radar speed measuring circuit 20, and is triggered by the second enable signal EN2 to output the working power VCC to the ultrasonic speed measuring circuit 30;

[0090] The controller 42 is connected to the power output circuit 41, the water level detection circuit 10, the radar speed measurement circuit 20 and the ultrasonic speed measurement circuit 30 respectively. The controller 42 is triggered by the first water level detection signal L1 to output the first enable signal EN1 and is triggered by the second water level detection signal H1 to output the second enable signal EN2;

[0091] The flow velocity and flow rate of the pipeline are determined according to the first flow velocity detection signal S1 or the second flow velocity detection signal S2.

[0092] In this embodiment, the power output circuit 41 realizes the power output operation. When the water level does not exceed the water level threshold, the radar ranging circuit 11 outputs the first water level detection signal L1, and the controller 42 outputs the first enable signal EN1. The power output circuit 41 triggers the output of the working power VCC to the radar speed measurement circuit 20 according to the first enable signal EN1. The radar speed measurement circuit 20 is powered on and performs flow velocity detection.

[0093] When the water level exceeds the water level threshold, the pressure water level gauge 12 outputs a second water level detection signal H1, the controller 42 triggers the output of the second enable signal EN2, and the power output circuit 41 triggers the output of the working power VCC to the ultrasonic speed measurement circuit 30 according to the second enable signal EN2, and the ultrasonic speed measurement circuit 30 performs flow velocity detection.

[0094] The controller 42 may adopt a structure such as MCU, CPU, single chip microcomputer, etc., and the power output circuit 41 may adopt a corresponding switch circuit, voltage stabilizing circuit, etc. In an optional embodiment, as Fig. 9 As shown, the power output circuit 41 includes:

[0095] The first voltage stabilizing circuit 411 is connected to the control output circuit 40 and the radar speed measuring circuit 20, is triggered to conduct by the first water level detection signal L1 or the first enable signal EN1, and outputs the working power supply VCC to the radar speed measuring circuit 20;

[0096] The second voltage stabilizing circuit 412 is connected to the control output circuit 40 and the ultrasonic velocity measuring circuit 30 , is triggered to conduct by the second water level detection signal H1 or the second enable signal EN2 , and outputs a working power supply VCC to the ultrasonic velocity measuring circuit 30 .

[0097] In this embodiment, the radar speed measurement circuit 20 and the ultrasonic speed measurement circuit 30 are respectively operated by the first voltage stabilizing circuit 411 and the second voltage stabilizing circuit 412. The power input terminals of the first voltage stabilizing circuit 411 and the second voltage stabilizing circuit 412 can be connected to the same power terminal, or respectively connected to a power terminal. When the water level does not exceed the water level threshold, the radar ranging circuit 11 outputs the first water level detection signal L1 or the controller 42 outputs the first enable signal EN1. When the first water level detection signal L1 is received or the first enable signal EN1 is received through the controller 42, the first voltage stabilizing circuit 411 is triggered to turn on and output the working power supply VCC to the radar speed measurement circuit 20. The radar speed measurement circuit 20 is powered on and performs flow velocity detection of the pipeline. The second voltage stabilizing circuit 412 does not receive the second water level detection signal H1 or the second enable signal EN2, the second voltage stabilizing circuit 412 is controlled to be turned off, and the output of the working power supply VCC to the ultrasonic speed measurement circuit 30 is cut off, and the ultrasonic speed measurement circuit 30 does not work.

[0098] When the water level exceeds the water level threshold, the pressure water level gauge 12 outputs the second water level detection signal H1, and the controller 42 triggers the output of the second enable signal EN2. The pressure water level gauge 12 outputs the second water level detection signal H1 or the controller 42 outputs the second enable signal EN2. When the second water level detection signal H1 is received or the second enable signal EN2 is received through the controller 42, the second voltage stabilizing circuit 412 is triggered to turn on, and outputs the working power supply VCC to the ultrasonic speed measurement circuit 30. The ultrasonic speed measurement circuit 30 is powered on and performs flow velocity detection in the pipeline. The first voltage stabilizing circuit 411 does not receive the first water level detection signal L1 or the first enable signal EN1. The first voltage stabilizing circuit 411 is controlled to be shut down, and the output of the working power supply VCC to the radar speed measurement circuit 20 is cut off, and the radar speed measurement circuit 20 does not work.

[0099] like Fig.10 As shown, in another optional embodiment, the power output circuit 41 includes:

[0100] The third voltage stabilizing circuit 413 is used to output a working power supply VCC;

[0101] The first switch circuit 414 is connected between the third voltage stabilizing circuit 413 and the radar speed measuring circuit 20, is triggered to conduct by the first water level detection signal L1 or the first enable signal EN1, and outputs the working power supply VCC to the radar speed measuring circuit 20;

[0102] The second switch circuit 415 is connected between the third voltage stabilizing circuit 413 and the ultrasonic velocity measuring circuit 30 , is triggered to conduct by the second water level detection signal H1 or the second enable signal EN2 , and outputs the working power supply VCC to the ultrasonic velocity measuring circuit 30 .

[0103] In this embodiment, the third voltage stabilizing circuit 413 serves as a power supply and outputs a working power supply VCC. When the first switch circuit 414 is turned on or the second switch circuit 415 is turned on, the working power supply VCC is output to the radar speed measurement circuit 20 or the ultrasonic speed measurement circuit 30 respectively.

[0104] When the water level does not exceed the water level threshold, the radar ranging circuit 11 outputs the first water level detection signal L1 or the controller 42 outputs the first enable signal EN1. When the first water level detection signal L1 is received or the first enable signal EN1 is received through the controller 42, the first switch circuit 414 is triggered to turn on and outputs the working power supply VCC to the radar speed measurement circuit 20. The radar speed measurement circuit 20 is powered on and performs flow velocity detection in the pipeline. The second switch circuit 415 does not receive the second water level detection signal H1 or the second enable signal EN2. The second switch circuit 415 is controlled to be turned off and the output of the working power supply VCC to the ultrasonic speed measurement circuit 30 is cut off. The ultrasonic speed measurement circuit 30 does not work.

[0105] When the water level exceeds the water level threshold, the pressure water level gauge 12 outputs a second water level detection signal H1, and the controller 42 triggers the output of the second enable signal EN2. The pressure water level gauge 12 outputs the second water level detection signal H1 or the controller 42 outputs the second enable signal EN2. When the second water level detection signal H1 is received or the second enable signal EN2 is received through the controller 42, the second switch circuit 415 is triggered to turn on and outputs the working power supply VCC to the ultrasonic speed measurement circuit 30. The ultrasonic speed measurement circuit 30 is powered on and performs flow velocity detection in the pipeline. The first switch circuit 414 does not receive the first water level detection signal L1 or the first enable signal EN1. The first switch circuit 414 is controlled to be turned off, and the output of the working power supply VCC to the radar speed measurement circuit 20 is cut off, and the radar speed measurement circuit 20 does not work.

[0106] Among them, each voltage stabilizing circuit can adopt a structure such as an LDO regulator, a three-terminal regulator, etc., and each switching circuit can adopt a switching device with controlled on and off. At the same time, the first switching circuit 414 and the second switching circuit 415 can select the same type or different types of switching devices according to the received signal and the on and off mode, and the specific structure is not limited.

[0107] The communication circuit 50 may be a wired communication circuit, a wireless communication circuit, etc. according to the type of the host computer. In an optional embodiment, the communication circuit 50 may include a wireless communication circuit and / or a wired communication circuit.

[0108] By setting up wired communication circuits and / or wireless communication circuits, communication can be achieved when facing different types of host computers, and data transmission, command issuance and remote power on and off can be achieved. The wired communication circuit can adopt RS485 communication module, RS232 communication module, etc., and the wireless communication circuit can adopt Bluetooth module, WIFI module, 4G module and other structures, and the specific structure is not limited.

[0109] Among them, since the flow meter is easily changed in angle due to the impact of water flow and debris during use, resulting in inaccurate distance and speed measurement data, in order to determine the coordinates of the flow meter for subsequent maintenance and repair, in an optional embodiment, as Fig.11 As shown, the flow meter also includes:

[0110] The gyroscope 60 is connected to the control output circuit 40 or the communication circuit 50, and is used to collect the three-axis coordinates of the flow meter and output the coordinate data.

[0111] In this embodiment, the gyroscope 60 detects the three-axis coordinates of the flow meter and outputs the coordinate data of the flow meter. The coordinate data is sent to the host computer through the control output circuit 40, the communication circuit 50 or directly through the communication circuit 50. The host computer can remotely obtain the angular coordinate information of the flow meter, promptly discover problems with the installation angle of the flow meter, and perform data correction and compensation for the acquired flow velocity and flow rate according to the angular coordinates.

[0112] Furthermore, in order to obtain the real-time status of the flow meter, determine whether an over-temperature problem occurs and implement over-temperature protection, in an optional embodiment, as Fig.11 As shown, the flow meter also includes:

[0113] The temperature sensor 70 is connected to the control output circuit 40 or the communication circuit 50, and is used to collect the temperature of the flow meter and output temperature data.

[0114] In this embodiment, the temperature sensor 70 is arranged in the flow meter, and the temperature of the flow meter is collected. The temperature data is sent to the host computer through the control output circuit 40, the communication circuit 50 or directly through the communication circuit 50. The host computer can remotely obtain the temperature of the flow meter, and promptly discover the problem of overheating of the flow meter. It can also output a power on / off signal or a low power consumption control signal according to the temperature to control the working state of the flow meter.

[0115] Compared with the prior art, the embodiment of the utility model has the following beneficial effects: the above-mentioned flow meter includes a water level detection circuit 10, a radar speed measurement circuit 20, an ultrasonic speed measurement circuit 30 and a control output circuit 40. When the water level in the pipeline is detected to be above or below the water level threshold, the water level detection circuit 10 outputs a first water level detection signal L1 and a second water level detection signal H1 respectively. The control output circuit 40 controls the radar speed measurement circuit 20 or the ultrasonic speed measurement circuit 30 to power on and detect the pipeline flow velocity. At the same time, the control output circuit 40 receives the corresponding flow velocity detection signal, thereby determining the pipeline flow velocity and flow rate and uploading the data to the host computer through the communication circuit 50, reducing the number of manual checks and costs. The radar speed measurement circuit 20 measures the flow velocity at a low water level, and the ultrasonic speed measurement circuit 30 measures the flow velocity at a high water level. The radar wave or ultrasonic wave operation is switched according to different water levels. While realizing flow velocity measurement, it is compatible with the scenarios of radar wave speed measurement and ultrasonic speed measurement, reducing the installation cost of multiple devices and the overall power consumption of the flow meter.

[0116] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A flow meter for measuring the flow velocity and flow rate of a pipeline, characterized in that: The flow meter comprises: a water level detection circuit, used to detect the water level of the pipeline, and output a first water level detection signal when the water level does not exceed the water level threshold, and output a second water level detection signal when the water level exceeds the water level threshold; A radar speed measuring circuit, used for detecting the flow velocity of the pipeline when powered on, and outputting a first flow velocity detection signal; An ultrasonic velocity measuring circuit, used for detecting the flow velocity of the pipeline when powered on, and outputting a second flow velocity detection signal; a control output circuit, connected to the water level detection circuit, the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and outputting working power to the radar speed measurement circuit when triggered by the first water level detection signal, and outputting working power to the ultrasonic speed measurement circuit when triggered by the second water level detection signal; and obtaining and determining the flow velocity and flow rate of the pipeline according to the first flow velocity detection signal or the second flow velocity detection signal; The communication circuit is connected to the control output circuit and the host computer respectively to transmit data and / or instructions.

2. The flow meter according to claim 1, characterized in that The water level detection circuit comprises: A radar ranging circuit, connected to the control output circuit, for detecting the water level of the pipeline and outputting a first water level detection signal when the water level does not exceed a water level threshold; A pressure water level gauge is connected to the control output circuit, and is used to detect the water level of the pipeline and output a second water level detection signal when the water level exceeds a water level threshold.

3. The flow meter according to claim 2, characterized in that The flow meter also includes: The shell, the pressure water level gauge, the ultrasonic speed measurement circuit, the radar speed measurement circuit and the radar distance measurement circuit are sequentially arranged at intervals along the direction of water level rise.

4. The flow meter according to claim 1, characterized in that The control output circuit comprises: a power output circuit, connected to the water level detection circuit, the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and outputting working power to the radar speed measurement circuit when triggered by the first water level detection signal, and outputting working power to the ultrasonic speed measurement circuit when triggered by the second water level detection signal; The controller is connected to the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and is used to obtain and determine the flow velocity and flow rate of the pipeline according to the first flow velocity detection signal or the second flow velocity detection signal.

5. The flow meter according to claim 1, characterized in that The control output circuit comprises: A power output circuit, connected to the radar speed measurement circuit and the ultrasonic speed measurement circuit respectively, and triggered by a first enable signal to output a working power supply to the radar speed measurement circuit, and triggered by a second enable signal to output a working power supply to the ultrasonic speed measurement circuit; a controller connected to the power output circuit, the water level detection circuit, the radar speed measurement circuit and the ultrasonic speed measurement circuit, respectively, the controller being triggered by the first water level detection signal to output the first enable signal and being triggered by the second water level detection signal to output the second enable signal; The flow velocity and flow rate of the pipeline are determined according to the first flow velocity detection signal or the second flow velocity detection signal.

6. The flow meter according to claim 4 or 5, characterized in that: The power output circuit comprises: A first voltage stabilizing circuit is connected to the control output circuit and the radar speed measuring circuit, is triggered to conduct by the first water level detection signal or the first enable signal, and outputs working power to the radar speed measuring circuit; The second voltage stabilizing circuit is connected to the control output circuit and the ultrasonic speed measuring circuit, is triggered to conduct by the second water level detection signal or the second enable signal, and outputs working power to the ultrasonic speed measuring circuit.

7. The flow meter according to claim 4 or 5, characterized in that: The power output circuit comprises: A third voltage stabilizing circuit, used for outputting working power; A first switch circuit is connected between the third voltage stabilizing circuit and the radar speed measuring circuit, is triggered to conduct by the first water level detection signal or the first enable signal, and outputs working power to the radar speed measuring circuit; The second switch circuit is connected between the third voltage stabilizing circuit and the ultrasonic speed measuring circuit, is triggered to conduct by the second water level detection signal or the second enable signal, and outputs working power to the ultrasonic speed measuring circuit.

8. The flow meter according to claim 1, characterized in that The communication circuit includes a wireless communication circuit and / or a wired communication circuit.

9. The flow meter according to claim 1, characterized in that The flow meter also includes: A gyroscope is connected to the control output circuit or the communication circuit, and is used to collect the three-axis coordinates of the flow meter and output coordinate data.

10. The flow meter according to claim 1, wherein: The flow meter also includes: A temperature sensor is connected to the control output circuit or the communication circuit, and is used to collect the temperature of the flow meter and output temperature data.

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