CN113375748A - Digital second water meter applied to water meter Internet of things - Google Patents
Digital second water meter applied to water meter Internet of things Download PDFInfo
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- CN113375748A CN113375748A CN202110628255.2A CN202110628255A CN113375748A CN 113375748 A CN113375748 A CN 113375748A CN 202110628255 A CN202110628255 A CN 202110628255A CN 113375748 A CN113375748 A CN 113375748A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/061—Indicating or recording devices for remote indication
- G01F15/063—Indicating or recording devices for remote indication using electrical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/065—Indicating or recording devices with transmission devices, e.g. mechanical
- G01F15/066—Indicating or recording devices with transmission devices, e.g. mechanical involving magnetic transmission devices
Abstract
A digital second-to-second water meter applied to a water meter Internet of things can be in communication connection with a main node device in a broadcast communication mode in real time. The water meter transmission intermediate wheel is provided with a permanent magnetic sheet, a magnetic induction angle sensor is arranged above a transparent meter sealing cover of the water meter and opposite to the permanent magnetic sheet, a monitoring pointer reflecting whether the metering fluid flows is arranged below the transparent meter sealing cover, the monitoring pointer synchronously rotates with a lowest gear of a metering one-ten-thousandth cubic order pointer through a gear set at the lower end of the monitoring pointer, and a detection part is arranged above the transparent meter sealing cover and corresponding to the monitoring pointer; the master control chip U8 sends the meter number of the water meter and the character wheel electric signal corresponding to the character wheel group accumulated electronic count value to the master node device which is far away from the water meter within 200 meters in a broadcast communication mode at regular time through the Bluetooth chip U4. The Bluetooth chip is in communication connection with the main node device, pairing authentication is not needed, data reporting and receiving are fast, and the sending distance is long.
Description
Technical Field
The invention relates to a Bluetooth wireless water meter, in particular to a digital second-pass water meter which is not required to be paired with a main device and can send information to the main device in real time and is applied to the Internet of things of the water meter.
Background
In the intelligent wireless water meter, there are amateur frequency range wireless water meter, LORA wireless water meter, NB-IoT wireless water meter, IP remote water meter, Bluetooth wireless water meter.
The IP remote transmission water meter and the NB-IoT wireless water meter need to pay the charge of the flow card to a communication operator regularly, and when the data of the water meter is reported to the main equipment, the power consumption is larger due to the fact that a certain time is needed for searching a network (base station), the service life of a battery is influenced, and therefore the service life and the maintenance cost of the water meter are influenced. In order to prolong the service life of the battery, the single use time of the battery has to be reduced by adopting a mode of regularly copying and regularly reporting data, so that the service life of the battery is prolonged. The situation can not be used for reading data of a target water meter in real time, particularly under the condition of prepayment, when a defaulting valve is closed, the valve cannot be opened in time, so that inconvenience is brought to a user, the user frequently complains to a water supply department, and for the problems, a Bluetooth wireless water meter for reporting data in real time also appears in the market, but the existing Bluetooth wireless water meter has the following problems.
1) The Bluetooth wireless water meter needs to be connected with a receiving device (hereinafter referred to as a master node device) in a pairing mode before sending information, and if the master device is far away or pairing information is not fed back, the Bluetooth wireless water meter cannot complete a task of sending related information to the master device, so that the reliability of information transmission is poor, and the stability is poor.
2) The Bluetooth wireless water meter adopting the pulse accumulation electromechanical conversion mode is easy to cause the deviation of pulse electronic accumulation count values and water meter mechanical character wheel count values in the long-time use process, the deviation can be superposed and continuously amplified along with the use time, so that the electromechanical synchronization of the water meter can not be realized, the longer the use time of the water meter is, the larger the deviation is, the inconsistent data which are remotely read and the actual water consumption are finally caused, and the situation often causes unnecessary disputes between users and managers.
The factors causing the deviation between the pulse electronic accumulated count value and the mechanical character wheel count value are many, such as in the use process, the water meter can cause the meter end meter to rotate forwards or backwards due to the phenomena of insufficient pipeline pressure, water hammer or shaking rotation and the like, the sensor for detecting the number of the rotating circles of the pointer can generate counting pulses, namely, the water meter can be used for water no matter rotates forwards or backwards, but the water meter does not really use water at the moment, the mechanical character wheel count of the water meter is not increased, and the pulse electronic counting part can count.
3) When the models of the Bluetooth chips used by a plurality of similar Bluetooth wireless water meters are different greatly or the models of the Bluetooth chips are different from the models of the Bluetooth chips used by the main node equipment, the compatibility problem exists, and the phenomenon that pairing cannot be performed easily occurs.
4) This kind of bluetooth wireless water meter is because need the manual work to carry out the meter and pair with the main node equipment, when the meter count is more, not only greatly increased the personnel's that check meter workload, but also need the personnel that check meter to have stronger responsibility heart and higher occupation literacy.
5) This type of bluetooth wireless water meter sets up to near field operating condition mostly, and communication distance is shorter, is 20 meters's within range at the diameter usually.
Disclosure of Invention
The invention aims to solve the technical problem of providing a digital second-pass water meter which can be used for the Internet of things of water meters and can be in communication connection with a main node device in a broadcast communication mode in real time.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention relates to a digital second water meter applied to a water meter Internet of things, which comprises a plurality of character wheels for directly reading high-order metering values, a plurality of pointers for displaying low-order metering values and a transmission intermediate wheel between a unit character wheel for metering a unit cubic order of magnitude and a pointer for metering a ten-thousandth cubic order of magnitude, wherein the transmission intermediate wheel is meshed with the unit character wheel, and the transmission ratio between the transmission intermediate wheel and the unit character wheel is 1: 1; the transmission intermediate wheel is meshed with a driving gear for driving the pointer of one cubic magnitude in ten-thousandth of measurement to rotate, and the transmission ratio between the transmission intermediate wheel and the driving gear is 1: 10, characterized in that: the center of the upper surface of the transmission intermediate wheel is provided with a permanent magnetic sheet which is oppositely arranged along the radial direction by opposite magnetic poles, a magnetic induction angle sensor is arranged above a transparent meter sealing cover of the water meter and is opposite to the permanent magnetic sheet, a monitoring pointer which reflects whether the metering fluid flows or not is arranged below the transparent meter sealing cover and at the side of a pointer disk, the monitoring pointer synchronously rotates with a lowest gear of a metering cubic magnitude pointer through a gear set at the lower end of the monitoring pointer, and a detection part which can detect the rotation information of the low pointer of the lowest gear is arranged above the transparent meter sealing cover and is corresponding to the monitoring pointer; after the detection part detects that the lowest gear is in a normal rotation state, the angle sensor sends the acquired intermediate wheel electric signal corresponding to the position information of the intermediate wheel rotating by the transmission intermediate wheel to a main control chip U8 in a main control circuit at regular time, the detection part sends the low pointer electric signal corresponding to the rotation information of the low pointer to the main control chip U8, and the rotation information of the low pointer comprises the rotation direction and the corresponding number of rotations of the lowest gear; the master control chip U8 sends the meter number of the water meter and the character wheel electric signals corresponding to the character wheel group accumulated electronic count value to the master node device which is far away from the water meter by 200 meters in a broadcast communication mode through the Bluetooth chip U4 and transmits the master node signal to the background water management center through the Internet.
The detection part consists of three Hall sensors, and the master control chip U8 sends the meter number of the water meter and the pointer electric signal corresponding to the pointer group accumulated electronic count value to the master node device in a broadcast communication mode through the Bluetooth chip U4.
When the intermediate wheel position information detected by the angle sensor is a positive numerical value of a unit character wheel, the main control chip U8 clears the accumulated electronic count value of the pointer group stored in the main control chip U8.
The main control circuit comprises a main control chip U8, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, an angle detection chip U5, a Bluetooth chip U4 and a disposable 3.6V battery, wherein the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 respectively send the low-order pointer electric signals acquired by the low-order pointer electric signals to a 20 th pin, a2 nd pin and a 19 th pin of the main control chip U8 through corresponding pulse output ends of the low-order pointer electric signals; the angle detection chip U5 transmits the collected intermediate wheel electric signals to the 18 th pin and the 17 th pin of the main control chip U8 through the 3 rd pin and the 5 th pin of the angle detection chip U5 respectively; the master control chip U8 sends the meter number of the water meter, the accumulated electronic count value of the character wheel set and the accumulated electronic count value of the pointer set to the 15 th pin and the 16 th pin of the Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin of the master control chip U8; the 3.6V battery respectively outputs stable 3.0V direct current working voltage to the main control chip U8 and the Bluetooth chip U4 through the voltage stabilizing chip U6; the main control chip U8 independently supplies power to the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 through a 10 th pin, an 11 th pin and a 12 th pin respectively; the main control chip U8 supplies power to the angle detection chip U5 through the 16 th pin.
The main control circuit further comprises a pi-type antenna ANT matching circuit formed by a second capacitor C2, a third capacitor C3 and a first resistor R1, one ends of the second capacitor, the third capacitor and the pi-type antenna ANT are connected with the ground end after being connected in common, the first resistor is bridged between the other ends of the second capacitor and the third capacitor, one end of the first resistor is connected with a No. 2 pin of a Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
The master control circuit further comprises a filter circuit of the Bluetooth transceiving circuit, wherein the filter circuit comprises an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a first diode D1 and an eleventh resistor R11, the eighth capacitor is connected with the first inductor in parallel, one end of the eighth capacitor is connected to the 1 st pin of the Bluetooth chip U4 after the eighth capacitor is connected in parallel, one path of the other end of the eighth capacitor is grounded through the ninth capacitor, the other path of the eighth capacitor is connected to the 31 st pin of the Bluetooth chip U4, the other path of the eighth capacitor is connected to the common connection end of one end of the second inductor and the positive electrode of the first diode, and the other end of the second inductor is connected to the 27 th pin of the Bluetooth chip U4.
The main control circuit further comprises a voltage division circuit which is composed of an eighth resistor R8, a ninth resistor R9 and a fourteenth capacitor C14 and used for detecting the input voltage of the main control chip U8, wherein the ninth resistor and the fourteenth capacitor are connected in parallel, one end of the ninth resistor and the fourteenth capacitor are grounded after being connected in parallel, the other end of the ninth resistor and the fourteenth capacitor are connected to the 3 rd pin of the main control chip U8 in parallel, and the other end of the ninth resistor and the fourteenth capacitor are connected to the voltage output end of the 3.6V battery through the eighth resistor.
The main control chip U8 is HC32L110C4UA, the three Hall chips are S-5716ANDL1-M3T1U, the angle detection chip U5 is MMA253F, the Bluetooth chip U4 is ATB1103, and the voltage stabilization chip U6 is S-1206B30-M3T 1U.
The 3.6V battery is a disposable lithium-thionyl chloride battery.
The main node equipment is a digital second-pass gateway or a mobile terminal which is held by a user and downloads special APP software.
The digital second-pass water meter applied to the water meter Internet of things has the following advantages and characteristics: 1) the Bluetooth chip in the main control circuit is in communication connection with the main node equipment in a broadcast communication mode, pairing authentication is not needed, data reporting and receiving are fast, the sending distance is long, and the transmission distance between the water meter and the main node equipment can reach 200 meters. 2) The Hall sensor group is adopted to ensure the small flow meter measurement monitoring, and the functions of mutual calibration of angular displacement direct reading and pulse electronic detection are realized. 3) The whole water meter operates with ultra-low power consumption, and a single battery can meet the requirement of the water meter on a mandatory verification regulation service cycle for 6 years.
Drawings
Fig. 1 is a schematic diagram of the appearance of the digital second-pass water meter applied to the internet of things of the water meter. Fig. 2 is a schematic view of the internal structure of fig. 1. Fig. 3 is a sectional view taken along line a-a in fig. 1. Figure 4 is a side view of the water meter. FIG. 5 is a schematic view of FIG. 4 with the transparent watch cover removed. Fig. 6 is a left side view of fig. 5. Fig. 7 is a right side view of fig. 5. Fig. 8 is a schematic view of the PCBA board of fig. 1. Fig. 9 is a right side view of fig. 8. Fig. 10 is a circuit schematic of the master control circuit of the present invention. Fig. 11 is an enlarged schematic view of a schematic diagram of block a in fig. 10. Fig. 12 is an enlarged schematic view of a schematic diagram of block B in fig. 10.
The reference numbers are as follows: the water meter comprises a water meter 1, a meter case 2, an impeller box 3, an impeller 31, a counter box 4, a lower clamping plate 41, an upper clamping plate 42, a gear transmission component 5, a lowest gear 51, a monitoring pointer 52, a gear set 53, a character wheel set 6, a unit character wheel 61, a middle driving coupling wheel 62, a pointer disc 63, a transmission intermediate wheel 7, a transparent meter cover 8, a direct reading window hole 81, a PCBA board 9, a detection part 91, an angle sensor 92, a permanent magnetic sheet 93, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, a wireless Bluetooth chip U4, an angle detection chip U5, a voltage stabilizing chip U6 and a main control chip U8.
Detailed Description
As shown in fig. 1, the digital second-pass water meter 1 applied to the internet of things of water meters of the present invention includes a mechanical structure and a main control circuit disposed therein.
The mechanical structure of the digital second-pass water meter (hereinafter referred to as the water meter 1) applied to the Internet of things of the water meter.
The water meter 1 is a water meter in which a direct reading counter and a pointer counter are combined, the direct reading counter is a counter for directly reading a flow value displayed by a number, and the pointer counter is a counter for displaying the flow value by indicating the flow value by using a pointer.
As shown in fig. 1, fig. 2, fig. 3, and fig. 4, the water meter 1 includes, from bottom to top, a meter case 2, an impeller case 3, an impeller 31, a counter case 4, a lower clamp plate 41, a gear transmission assembly 5, a gear train 53, a monitoring pointer 52, a character wheel group 6, a middle drive coupling wheel 62, a transmission intermediate wheel 7, an upper clamp plate 42, a transparent meter cover 8, and a PCBA board 9 provided with a main control circuit.
The impeller case 3 is installed in the case 2, the impeller 31 is placed in the impeller case 3, and when the metered aqueous medium flows through the impeller case 3, the flowing aqueous medium stirs the impeller 31 to rotate. The counter box 4 is mounted on the impeller box 3 in a sealed isolation from the impeller box 3, i.e. a sealing rubber ring is mounted between the counter box 4 and the impeller box 3 to prevent water in the impeller box 3 from entering the counter box 4.
The upper clamping plate 42 and the lower clamping plate 41 are arranged in the counter box 4, the gear transmission assembly 5 and the character wheel group 6 are arranged between the upper clamping plate 42 and the lower clamping plate 41, and the upper end of the impeller 31 penetrates through the counter box 4 and is meshed with the lowest-order driving gear in the gear transmission assembly 5 through a driving wheel.
The character wheel group 6 is composed of a plurality of character wheels which display high-order metering numerical values capable of being directly read (direct reading means that data are directly read by naked eyes) by numbers, each character wheel in the character wheel group 6 is arranged in parallel from small to large and comprises character wheels displaying cubic orders of ones, tens, hundreds, thousands and tens (or more orders of magnitude), all the character wheels are assembled on a character wheel shaft, 0-9 digital characters are sequentially arranged on the circumferential side wall of each character wheel at equal intervals, a carry coupling wheel is arranged between every two adjacent character wheels, the low order rotates for one circle, and the adjacent high order rotates for one number.
A direct reading window hole 81 for reading the counting value of each character wheel is arranged on the upper clamping plate 42 at the position corresponding to each character wheel in the character wheel group 6.
As shown in fig. 5, a plurality of pointers which display low-level metering values in a pointer rotation mode, such as one tenth, one hundredth, one thousandth and one ten thousandth cubic order of magnitude, are arranged at positions under the transparent watch cover 8 and opposite to the word wheel set 6, each pointer is fixedly connected with one single-level driving gear in the gear transmission assembly 5, and the driving gear corresponding to the one ten thousandth counting pointer is referred to as a lowest gear 51 hereinafter.
As shown in fig. 1, 2, 3, 4, 5, 8, and 9, a monitoring pointer 52 reflecting whether the metered fluid flows or not is provided below the transparent watch cover 8 and beside the pointer disk 63, and the monitoring pointer 52 rotates synchronously with the lowest gear 51 through a gear set 53 at the lower end thereof, and the transmission ratio therebetween is 1: 1.
as shown in fig. 3, 5, 6and 7, a transmission intermediate wheel 7 and a middle driving coupling wheel 62 are arranged between a driving gear which drives a pointer with the highest magnitude (namely, the order of one tenth of a cubic meter) in the gear transmission assembly 5 and a unit character wheel 61 in the character wheel set 6.
The transmission intermediate wheel 7 is meshed with the driving gear for driving the pointer with the highest magnitude, and the transmission ratio between the transmission intermediate wheel and the driving gear is 1: 10 (namely, the driving gear driving the pointer with the highest magnitude rotates ten times, the transmission intermediate wheel 7 rotates one time), meanwhile, the transmission intermediate wheel 7 is meshed with the middle driving coupling wheel 62, the middle driving coupling wheel 62 is parallel and coaxial with the character wheel group 6, wherein, the transmission intermediate wheel 7 is meshed with the middle driving coupling wheel 62 in an axis crossing mode.
The transmission ratio among the transmission intermediate wheel 7, the middle driving coupling wheel 62 and the unit character wheel 61 is 1: 1: 1. namely, the transmission intermediate wheel 7 rotates for one circle, the middle driving coupling wheel 62 rotates for one circle, and the unit character wheel 61 also rotates for one circle.
A permanent magnet piece 93 having opposite magnetic poles is fixed to the center of the upper surface (i.e., spoke surface) of the transmission intermediate wheel 7, and a magnetically inductive angle sensor 92 (i.e., an angle detection chip U5 in the circuit) is correspondingly provided at a position opposite to the permanent magnet piece 93 outside the transparent cover 8. The angle sensor 92 can capture the rotating angle position of the permanent magnet 93 in real time, so as to obtain the position information of the idle gear (i.e. the rotating position of the transmission idle gear 7, which corresponds to the digital information of the direct reading window 81 of the water meter 1 on the unit number wheel 61). That is, when the permanent magnet 93 rotates 0.1, 0.2, half … or 0.9 turns from the initial position (0 number) along with the transmission intermediate wheel 7, the angle sensor 92 can detect that the number of the unit number wheel 61 facing the direct reading window 81 of the water meter 1 corresponds to 1, 2, 5 … or 9 integer number respectively.
The angle detection accuracy of the angle sensor 92 employed in the present invention can be as low as 0.1 degree.
In the gear transmission assembly 5, from small to large, the transmission ratio between two adjacent low-position metering drive gears is 10: 1 (i.e. ten revolutions of the low pointer and one revolution of the adjacent high pointer).
A detecting member 91 capable of detecting the rotation information of the lower pointer of the lowest gear 51 is provided at a position corresponding to the monitoring pointer 52 on the transparent watch cover 8, and the rotation information of the lower pointer is: when the lowest gear 51 rotates, information of forward rotation (forward direction refers to the rotation direction of the impeller 31 when the water meter 1 uses water normally), information of reverse rotation (reverse direction refers to the reverse rotation of the impeller 31 caused by external interference factors or the reverse rotation of the impeller 31 caused by the deliberate action of an individual water thief), information of micro-rotation caused by the shake of the impeller 31 caused by the external interference, and information of the number of rotations corresponding to the forward rotation and the reverse rotation.
The detection part 91 will the low level pointer signal of telecommunication that the rotatory information of low level pointer corresponds send for main control chip U8, after being discriminated by this main control chip U8 again (getting rid of because of the electronic count of shake and reverse rotation production), send the pointer signal of telecommunication that table number and the pointer group accumulative electronic count value of this wireless water gauge 1 correspond to main node equipment (main node equipment includes digital second water meter gateway, downloads and has special APP software and for the mobile terminal that the user held) with the broadcast communication mode through bluetooth chip U4 wherein.
The accumulated electronic count value of the pointer group is an electronic count value of a metering pointer of one tenth, one hundredth, one thousandth and one thousandth of a cubic order of magnitude calculated by the main control chip U8 according to the low pointer rotation information collected by the detection unit 91.
The detecting member 91 may be a hall sensor assembly, a photoelectric sensor assembly, a mechanical sensor assembly, or the like. The preferred detecting component of the present invention is a hall sensor assembly, which is composed of three hall sensors (i.e. three hall chips), and correspondingly, a permanent magnetic block for detection is arranged on the monitoring pointer 52, the three hall sensors are distributed around the monitoring pointer 52, and the included angle between two adjacent hall sensors among the three hall sensors is preferably 120 degrees.
The three Hall sensors are arranged, so that the gear 51 at the lowest position can be effectively identified to rotate in the forward direction or the reverse direction, and meanwhile, the micro-rotation phenomenon of the gear 51 at the lowest position caused by the shaking of the pipeline can be accurately and timely captured.
The output sequence of the pulse generated by the three Hall sensors corresponding to the forward rotation and the reverse rotation is different. And when the sensor shakes slightly, the lowest gear 51 mostly reciprocates and slowly rotates back and forth at the rest position, and at least one of the three hall sensors does not output a pulse signal because the lowest gear 51 does not do complete circular motion.
After the detecting component 91 detects that the lowest gear 51 is in a normal rotation state, the angle sensor 92 sends the intermediate wheel electric signal corresponding to the acquired intermediate wheel position information to a main control chip U8 in a main control circuit at regular time.
The master control chip U8 sends the electric signals of the character wheel corresponding to the accumulated electronic count value of the character wheel group and the meter number of the digital second-pass water meter 1 applied to the Internet of things of the water meter to the master node device which is as far as 200 meters away from the wireless water meter 1 in a broadcasting communication mode at regular time through the Bluetooth chip U4 in the master control circuit.
The accumulated electronic count value of the character wheel group refers to the electronic count value of the character wheel with the cubic magnitude of measurement units, tens, hundreds, thousands and tens of thousands, which is calculated by the main control chip U8 according to the position information of the intermediate wheel collected by the angle sensor 92 and the accumulated rotation number of the intermediate wheel.
In order to reduce the accumulated error between the pointer group accumulated electronic count value and the character wheel group accumulated electronic count value caused by external interference factors, when the intermediate wheel position information sent to the main control chip U8 by the angle sensor 92 is that the unit character wheel 61 rotates to a positive numerical value (the positive numerical value is that the number on the unit character wheel 61, which faces the direct reading window 81 of the water meter 1, is 0, 1, 2, … or 9), the main control chip U8 clears the accumulated electronic count value of the pointer group stored therein, and then the three hall sensors accumulate and count again.
The purpose of the zero clearing is to realize mutual calibration of the accumulated count value of the pointer group and the accumulated electronic count value of the word wheel group. Theoretically, when the accumulated electronic count value of the pointer group reaches 1000 liters, the number corresponding to the direct reading of the unit character wheel 61 should reach 1 cubic meter; in fact, due to the interference of external factors, generally, when the unit digit wheel 61 directly reads to 1 cube, the corresponding pointer group accumulated electronic count value is often about 1000 liters, and in order to eliminate the counting error caused by the pointer group accumulated electronic count value, when the unit digit wheel 61 directly reads to the normal digit value, the pointer group accumulated electronic count value is cleared to zero, so that the error is prevented from being amplified infinitely in the long-time use process, and therefore the accurate metering of the whole water meter 1 is ensured, and the requirement of a client on accurate metering is met.
And a main control circuit.
As shown in fig. 10, 11 and 12, the main control circuit includes a main control chip U8, a pulse sampling circuit, an angular displacement direct-reading sampling circuit, a bluetooth transceiver circuit and a disposable 3.6V battery.
1. A pulse sampling circuit.
The Hall sensor group comprises three Hall chips, namely a first Hall chip U1, a second Hall chip U2 and a third Hall chip U3.
Three Hall elements are adopted to realize forward and reverse rotation metering and a pointer of 0.0001 cubic meter of the sampling water meter, so that 1 liter can be metered, and the transient flow can be monitored.
The first hall chip U1, the second hall chip U2, and the third hall chip U3 respectively send the collected electric pulse signals (i.e., the low pointer electric signals) corresponding to the rotation number and the rotation direction of the lowest gear 51 to the 20 th pin, the 2 nd pin, and the 19 th pin of the main control chip U8 through the corresponding pulse output terminals.
The main control chip U8 is respectively and independently powered by the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 through the 10 th pin, the 11 th pin and the 12 th pin, and the power consumption of the circuit is reduced.
When water flows in the water meter 1, the three Hall chips sequentially sense the magnetic field intensity of the magnet, the three Hall chips sequentially output low levels to the main control chip U8 due to the sufficient magnetic field intensity, and the interruption trigger circuit in the main control chip U8 triggers the number of interruption counting pulses, so that the elevating metering is realized.
2. An angular displacement direct-reading sampling circuit.
The water meter reading device mainly comprises an angle detection chip U5, wherein the angle detection chip U5 is used for detecting the rotation angle value of the unit number wheel 61 of the water meter, namely, the reading of the unit number wheel 61 is sampled, and the water meter 1 is ensured not to generate accumulated errors in long-term use.
The angle detection chip U5 transmits the collected electric signal of the intermediate wheel to the 18 th pin and the 17 th pin of the main control chip U8 through the 3 rd pin and the 5 th pin of the angle detection chip U5 respectively.
When the main control chip U8 reads the position information of the intermediate wheel, the 16 th pin supplies power to the angle detection chip U5, so that the power consumption of the whole circuit can be effectively reduced.
When the unit character wheel 61 of the water meter 1 rotates, the angle detection chip U5 outputs a voltage signal (ADX +, ADY +, namely a medium wheel electric signal) which forms sine and cosine relations with the angle of the magnetic field, the voltage signal is transmitted to the main control chip U8 through the 3 rd pin and the 5 th pin of the voltage signal, and the indicating value of the current unit character wheel 61 is calculated through the main control chip U8, so that the direct reading function of the unit character wheel 61 is realized.
3. A Bluetooth transceiving circuit.
Mainly comprises a wireless Bluetooth chip U4 which is controlled by a main control chip U8 to perform wireless data exchange with the main node device. Which connects to the master node device via broadcast communication (i.e., without pairing).
The master control chip U8 sends the meter number and the character wheel group accumulated electronic count value of the water meter 1 to the 15 th pin and the 16 th pin of the wireless Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin of the master control chip U8, and the wireless Bluetooth chip U4 sends the meter number and the character wheel group accumulated electronic count value to the master node equipment in a broadcast communication mode;
similarly, the wireless bluetooth chip U4 may also forward the received data signal sent by the master node device and reset the relevant parameters of the wireless water meter 1 (the relevant parameters include the detection period setting of the angle sensor 92, the opening or closing of the water valve, the detection of the battery power consumption, and the bluetooth signal strength setting) to the master control chip U8.
The main control chip U8 controls the conduction of the CMOS switch tube Q1 through its 7 th pin, so that the battery provides a stable 3.0V operating voltage for the wireless bluetooth chip U4.
A main frequency crystal oscillation circuit of the wireless Bluetooth chip U4 is composed of a capacitor C29, a capacitor C30 and a capacitor Y1.
The clock crystal oscillating circuit of the wireless Bluetooth chip U4 is composed of a capacitor C19, a capacitor C20 and a Y3.
4. And a pi-type antenna ANT matching circuit.
The main control circuit further comprises a pi-type antenna ANT matching circuit formed by a second capacitor C2, a third capacitor C3 and a first resistor R1, one ends of the second capacitor, the third capacitor and the pi-type antenna ANT are connected with the ground end after being connected in common, the first resistor is bridged between the other ends of the second capacitor and the third capacitor, one end of the first resistor is connected with a No. 2 pin of a Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
5. And a filter circuit of the Bluetooth transceiving circuit.
The master control circuit further comprises a filter circuit of the Bluetooth transceiving circuit, wherein the filter circuit comprises an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a first diode D1 and an eleventh resistor R11, the eighth capacitor is connected with the first inductor in parallel, one end of the eighth capacitor is connected to the 1 st pin of the Bluetooth chip U4 after the eighth capacitor is connected in parallel, one path of the other end of the eighth capacitor is grounded through the ninth capacitor, the other path of the eighth capacitor is connected to the 31 st pin of the Bluetooth chip U4, the other path of the eighth capacitor is connected to the common connection end of one end of the second inductor and the positive electrode of the first diode, and the other end of the second inductor is connected to the 27 th pin of the Bluetooth chip U4.
6. A voltage detection circuit.
The main control circuit further comprises a voltage division circuit which is composed of an eighth resistor R8, a ninth resistor R9 and a fourteenth capacitor C14 and used for detecting the input voltage of the main control chip U8, wherein the ninth resistor and the fourteenth capacitor are connected in parallel, one end of the ninth resistor and the fourteenth capacitor are grounded after being connected in parallel, the other end of the ninth resistor and the fourteenth capacitor are connected to the 3 rd pin of the main control chip U8 in parallel, and the other end of the ninth resistor and the fourteenth capacitor are connected to the voltage output end of the 3.6V battery through the eighth resistor. The main control chip U8 is HC32L110C4UA, the three Hall chips are S-5716ANDL1-M3T1U, the angle detection chip U5 is MMA253F, the wireless Bluetooth chip U4 is ATB1103, and the voltage stabilization chip U6 is S-1206B30-M3T 1U.
7. A battery.
A 3.6V disposable lithium-thionyl chloride cell is preferred.
The battery outputs stable direct current working voltage to the main control chip U8 through the voltage stabilizing chip U6. .
Claims (10)
1. The utility model provides a be applied to digital second of water gauge thing networking and lead to water gauge, includes a plurality of word wheels of directly reading high-order measurement numerical value, a plurality of pointer that show low-order measurement numerical value and transmission idle wheel (7) between unit word wheel (61) of measurement unit cubic order of magnitude and the pointer of measurement tenth unit cubic order of magnitude, and transmission idle wheel (7) and unit word wheel (61) mesh mutually, and the drive ratio between them is 1: 1; the transmission intermediate wheel (7) is meshed with a driving gear which drives the pointer with one tenth of a cube of magnitude to rotate, and the transmission ratio between the transmission intermediate wheel and the driving gear is 1: 10, characterized in that: a permanent magnetic sheet (93) which is oppositely arranged by opposite magnetic poles along the radial direction is arranged in the center of the upper surface of the transmission intermediate wheel (7), a magnetic induction angle sensor (92) is arranged above a transparent meter sealing cover (8) of the water meter (1) and at the position opposite to the permanent magnetic sheet (93), a monitoring pointer (52) which reflects whether the metering fluid flows or not is arranged below the transparent meter sealing cover (8) and at the side of a pointer disk (63), the monitoring pointer (52) synchronously rotates with a lowest gear (51) of a one-ten-thousandth cubic magnitude pointer through a gear set (53) at the lower end of the monitoring pointer, and a detection part (91) which can detect the rotation information of the low pointer of the lowest gear (51) is arranged above the transparent meter sealing cover (8) and at the position corresponding to the monitoring pointer (52); after the detection part (91) detects that the lowest gear (51) is in a normal rotation state, the angle sensor (92) sends acquired intermediate wheel electric signals corresponding to intermediate wheel position information of rotation of the transmission intermediate wheel (7) to a main control chip U8 in a main control circuit at regular time, the detection part (91) sends low pointer electric signals corresponding to the low pointer rotation information to the main control chip U8, and the low pointer rotation information comprises the rotation direction and the corresponding rotation number of the lowest gear (51); the master control chip U8 sends the meter number of the water meter (1) and the character wheel electric signals corresponding to the character wheel group accumulated electronic count value to the master node device which is far away from the water meter (1) to 200 meters in a broadcasting communication mode through the Bluetooth chip U4 and transmits the master node signal to the background water management center through the Internet.
2. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 1, which is characterized in that: the detection part (91) consists of three Hall sensors, and the master control chip U8 sends the meter number of the water meter (1) and the pointer electric signal corresponding to the pointer group accumulated electronic count value to the master node device in a broadcast communication mode through the Bluetooth chip U4.
3. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 2, wherein: when the intermediate wheel position information detected by the angle sensor (92) is a positive numerical value of the unit character wheel (61), the main control chip U8 clears the accumulated electronic count value of the pointer group stored in the main control chip U8.
4. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 3, wherein: the main control circuit comprises a main control chip U8, a first Hall chip U1, a second Hall chip U2, a third Hall chip U3, an angle detection chip U5, a Bluetooth chip U4 and a disposable 3.6V battery, wherein the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 respectively send the low-order pointer electric signals acquired by the low-order pointer electric signals to a 20 th pin, a2 nd pin and a 19 th pin of the main control chip U8 through corresponding pulse output ends of the low-order pointer electric signals; the angle detection chip U5 transmits the collected intermediate wheel electric signals to the 18 th pin and the 17 th pin of the main control chip U8 through the 3 rd pin and the 5 th pin of the angle detection chip U5 respectively; the master control chip U8 sends the meter number of the water meter (1), the accumulated electronic count value of the word wheel set and the accumulated electronic count value of the pointer set to the 15 th pin and the 16 th pin of the Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin; the 3.6V battery respectively outputs stable 3.0V direct current working voltage to the main control chip U8 and the Bluetooth chip U4 through the voltage stabilizing chip U6; the main control chip U8 independently supplies power to the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 through a 10 th pin, an 11 th pin and a 12 th pin respectively; the main control chip U8 supplies power to the angle detection chip U5 through the 16 th pin.
5. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 4, wherein: the main control circuit further comprises a pi-type antenna ANT matching circuit formed by a second capacitor C2, a third capacitor C3 and a first resistor R1, one ends of the second capacitor, the third capacitor and the pi-type antenna ANT are connected with the ground end after being connected in common, the first resistor is bridged between the other ends of the second capacitor and the third capacitor, one end of the first resistor is connected with a No. 2 pin of a Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
6. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 5, wherein: the master control circuit further comprises a filter circuit of the Bluetooth transceiving circuit, wherein the filter circuit comprises an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a first diode D1 and an eleventh resistor R11, the eighth capacitor is connected with the first inductor in parallel, one end of the eighth capacitor is connected to the 1 st pin of the Bluetooth chip U4 after the eighth capacitor is connected in parallel, one path of the other end of the eighth capacitor is grounded through the ninth capacitor, the other path of the eighth capacitor is connected to the 31 st pin of the Bluetooth chip U4, the other path of the eighth capacitor is connected to the common connection end of one end of the second inductor and the positive electrode of the first diode, and the other end of the second inductor is connected to the 27 th pin of the Bluetooth chip U4.
7. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 6, wherein: the main control circuit further comprises a voltage division circuit which is composed of an eighth resistor R8, a ninth resistor R9 and a fourteenth capacitor C14 and used for detecting the input voltage of the main control chip U8, wherein the ninth resistor and the fourteenth capacitor are connected in parallel, one end of the ninth resistor and the fourteenth capacitor are grounded after being connected in parallel, the other end of the ninth resistor and the fourteenth capacitor are connected to the 3 rd pin of the main control chip U8 in parallel, and the other end of the ninth resistor and the fourteenth capacitor are connected to the voltage output end of the 3.6V battery through the eighth resistor.
8. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 7, wherein: the main control chip U8 is HC32L110C4UA, the three Hall chips are S-5716ANDL1-M3T1U, the angle detection chip U5 is MMA253F, the Bluetooth chip U4 is ATB1103, and the voltage stabilization chip U6 is S-1206B30-M3T 1U.
9. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 8, wherein: the 3.6V battery is a disposable lithium-thionyl chloride battery.
10. The digital second-pass water meter applied to the internet of things of water meters as claimed in claim 1, which is characterized in that: the main node equipment is a digital second-pass gateway or a mobile terminal which is held by a user and downloads special APP software.
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| US20190281371A1 (en) * | 2018-03-07 | 2019-09-12 | Michael Edward Klicpera | Water Meter and Leak Detection System having Communication with a Smart Central Hub Listening and Speaking Apparatus, Wireless Thermostat and/or Home Automation System |
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