CN113375748B - Digital second through water meter applied to water meter internet of things - Google Patents
Digital second through water meter applied to water meter internet of things Download PDFInfo
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- CN113375748B CN113375748B CN202110628255.2A CN202110628255A CN113375748B CN 113375748 B CN113375748 B CN 113375748B CN 202110628255 A CN202110628255 A CN 202110628255A CN 113375748 B CN113375748 B CN 113375748B
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- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 4
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- 239000003990 capacitor Substances 0.000 claims description 42
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- SOZVEOGRIFZGRO-UHFFFAOYSA-N [Li].ClS(Cl)=O Chemical compound [Li].ClS(Cl)=O SOZVEOGRIFZGRO-UHFFFAOYSA-N 0.000 claims description 3
- 230000006855 networking Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 7
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- 238000010586 diagram Methods 0.000 description 5
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- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
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- 238000009825 accumulation Methods 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
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Abstract
A digital second through water meter which can be used for carrying out communication connection to main node equipment in a broadcasting communication mode in real time is applied to the Internet of things of the water meter. 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 metering fluid flows is arranged below the transparent meter sealing cover, the monitoring pointer synchronously rotates with a lowest gear of a metering ten-thousandth cubic order pointer through a gear group 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 main control chip U8 sends the number of the water meter and the character wheel electric signal corresponding to the accumulated electronic count value of the character wheel group to the main node equipment within 200 meters away from the water meter in a broadcasting communication mode through the Bluetooth chip U4. The Bluetooth chip is in communication connection with the main node equipment, pairing authentication is not needed, and the Bluetooth chip is fast in reporting and receiving data and long in sending distance.
Description
Technical Field
The invention relates to a Bluetooth wireless water meter, in particular to a digital second through water meter which does not need 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
The intelligent wireless water meter comprises amateur frequency band wireless water meter, LORA wireless water meter, NB-IoT wireless water meter, IP remote water meter and Bluetooth wireless water meter.
The IP remote water meter and the NB-IoT wireless water meter need to pay the traffic card charge to the communication operator regularly, and when the water meter data is reported to the main equipment, the power consumption is high due to a certain time required for searching the network (base station), and the service life of the battery is influenced, so that 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 timing meter reading and timing data reporting, so that the service life of the battery is prolonged. The situation can not read data in real time aiming at a target water meter, particularly under the condition of prepayment, after the valve is closed due to arrearage, the valve can not be opened in time, so that a plurality of inconveniences are brought to a user, the user is frequently complained to a water supply department, and according to the problems, the Bluetooth wireless water meter capable of reporting data in real time appears on the market, but the current Bluetooth wireless water meter has the following problems.
1) The Bluetooth wireless water meter needs to be matched and connected with receiving equipment (hereinafter referred to as main node equipment) before sending information, if the distance of the main equipment is far or the matched information is not fed back, the Bluetooth wireless water meter cannot finish the task of sending related information to the main equipment, 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 deviation between the pulse electronic accumulation count value and the mechanical character wheel count value of the water meter in the long-time use process, and the deviation can be overlapped and continuously amplified along with the use time, so that the electromechanical synchronization cannot be realized, the longer the use time of the water meter is, the larger the deviation is, the inconsistent between the remote data and the actual water consumption is finally caused, and unnecessary disputes are often generated between a user and a management party under the condition.
The factors causing the deviation of the pulse electronic accumulated count value and the mechanical character wheel count value are many, for example, in the use process, the phenomenon of insufficient pipeline pressure, water hammer or shaking rotation and the like of the water meter can cause the meter end meter to rotate forward or reverse, at the moment, the sensor for detecting the rotation number of the pointer can generate count pulses, namely, the water is used no matter the forward rotation or the reverse rotation, 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 counts.
3) When the types of the Bluetooth chips used by the same type Bluetooth wireless water meters are large in difference or different from those of the Bluetooth chips used by the main node equipment, compatibility problems exist, and the phenomenon of incapability of pairing easily occurs.
4) The Bluetooth wireless water meter is matched with the main node equipment by manually carrying out meter counting, so that when the number of the meter counting is large, the workload of meter reading personnel is greatly increased, and the meter reading personnel is required to have stronger responsibility and higher occupational literacy.
5) Most of Bluetooth wireless water meters are set to be in a near-field working state, and the communication distance is short, and is usually in the range of 20 meters in diameter.
Disclosure of Invention
The invention aims to solve the technical problem of providing a digital second through water meter which can be used for carrying out communication connection to main node equipment in a broadcasting communication mode and is applied to the Internet of things of the water meter.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a digital second through water meter applied to the Internet of things of water meters, which comprises a plurality of word 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 word wheel for metering a unit cube order of magnitude and a pointer for metering a unit ten-thousandth cube order of magnitude, wherein the transmission intermediate wheel is meshed with the unit word wheel, and the transmission ratio between the transmission intermediate wheel and the unit word wheel is 1:1, a step of; the transmission intermediate wheel is meshed with a driving gear for driving the pointer of the order of one ten thousandth bit cube 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 which is oppositely arranged in the radial direction by a different magnetic pole is arranged in the center of the upper surface of the transmission intermediate wheel, a magnetic induction angle sensor is arranged at the position above the transparent meter sealing cover of the water meter, which is opposite to the permanent magnetic sheet, a monitoring pointer which reflects whether the metering fluid flows is arranged below the transparent meter sealing cover and is positioned at the side of the pointer disc, the monitoring pointer synchronously rotates with the lowest-order gear of the metering ten-thousandth cubic order pointer through a gear group at the lower end of the monitoring pointer, and a detection part which can detect the rotation information of the lowest-order pointer is arranged at the position above the transparent meter sealing cover, which corresponds to the monitoring pointer; the angle sensor sends the acquired intermediate wheel electric signal corresponding to the intermediate wheel position information of the transmission intermediate wheel rotation to a main control chip U8 in a main control circuit at regular time after the detection part detects that the lowest-order gear is in a normal rotation state, and the detection part sends the low-order pointer electric signal corresponding to the low-order pointer rotation information to the main control chip U8, wherein the low-order pointer rotation information comprises the rotation direction of the lowest-order gear and the corresponding rotation number; the main control chip U8 sends the number of the water meter and the character wheel electric signal corresponding to the accumulated electronic count value of the character wheel group to the main node equipment within 200 meters away from the water meter in a broadcasting communication mode through the Bluetooth chip U4 at regular time and sends the number of the water meter and the character wheel electric signal to the background water management center through the Internet.
The detection part consists of three Hall sensors, and the main control chip U8 sends pointer electric signals corresponding to the meter number and the pointer group accumulated electronic count value of the water meter to the main node equipment in a broadcast communication mode through the Bluetooth chip U4.
When the intermediate wheel position information detected by the angle sensor is a positive value of a bit character wheel, the main control chip U8 clears the accumulated electronic count value of the pointer group stored in the intermediate wheel position information.
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-level pointer electric signals acquired by the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 to a 20 th pin, a2 nd pin and a 19 th pin of the main control chip U8 through corresponding pulse output ends; the angle detection chip U5 transmits the acquired 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 intermediate wheel electric signals respectively; the main control chip U8 sends the meter number of the water meter, the accumulated electronic count value of the character wheel group and the accumulated electronic count value of the pointer group to the 15 th and 16 th pins 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 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 respectively; the main control chip U8 supplies power to 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 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 after being connected together, the first resistor is connected between the other ends of the second capacitor and the third capacitor in a bridging mode, one end of the first resistor is connected with the 2 nd pin of the Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
The main control circuit further comprises a filter circuit of the Bluetooth receiving and transmitting 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 filter circuit after being connected in parallel is connected with the 1 st pin of the Bluetooth chip U4, the other end of the filter circuit after being connected in parallel is grounded through the ninth capacitor, the other end of the filter circuit is connected with the 31 st pin of the Bluetooth chip U4, the other end of the filter circuit is connected with a common connection end of one end of the second inductor and the anode of the first diode, and the other end of the second inductor is connected with the 27 th pin of the Bluetooth chip U4.
The main control circuit further comprises a voltage dividing circuit which is formed by 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 is connected with the fourteenth capacitor in parallel, one end of the parallel connection is grounded, the other end of the parallel connection is connected with the 3 rd pin of the main control chip U8, and the other end of the parallel connection is connected with the voltage output end of the 3.6V battery through the eighth resistor.
The model of the main control chip U8 is HC32L110C4UA, the model of the three Hall chips is S-5716ANDL1-M3T1U, the model of the angle detection chip U5 is MMA253F, the model of the Bluetooth chip U4 is ATB1103, and the model of the voltage stabilizing chip U6 is S-1206B30-M3T1U.
The 3.6V battery is a disposable lithium-thionyl chloride battery.
The main node equipment is a mobile terminal which is held by a digital second gateway or a user and downloads special APP software.
The digital second through water meter applied to the Internet of things of the water meter 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, reporting and receiving data 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 metering monitoring and realize the mutual calibration function of angular displacement direct reading and pulse electronic detection. 3) The whole water meter operates with ultra-low power consumption, and a single battery can meet the requirement of the forced verification of the water meter for 6 years.
Drawings
Fig. 1 is a schematic diagram of the appearance of a digital second through water meter applied to the internet of things of the water meter. Fig. 2 is a schematic diagram of the internal structure of fig. 1. Fig. 3 is a cross-sectional view taken along A-A in fig. 1. Fig. 4 is a side view of the meter. FIG. 5 is a schematic illustration 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 schematic circuit diagram of a master circuit according to the present invention. Fig. 11 is an enlarged schematic view of the schematic diagram of block a in fig. 10. Fig. 12 is an enlarged schematic view of the schematic diagram of block B of fig. 10.
The reference numerals 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 assembly 5, a lowest gear 51, a monitoring pointer 52, a gear group 53, a character wheel group 6, a unit character wheel 61, a middle drive 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 through water meter 1 applied to the internet of things of the water meter of the invention comprises a mechanical structure and a main control circuit arranged in the mechanical structure.
1. The mechanical structure of the digital second through water meter (hereinafter referred to as water meter 1) applied to the Internet of things of water meter.
The water meter 1 is a water meter combining a direct-reading counter and a pointer counter, wherein the direct-reading counter is a counter for directly reading and displaying flow values in a digital manner, and the pointer counter is a counter for displaying the flow values by adopting a pointer indication.
As shown in fig. 1, 2, 3 and 4, the water meter 1 comprises a case 2, an impeller box 3, an impeller 31, a counter box 4, a lower clamping plate 41, a gear transmission assembly 5, a gear set 53, a monitoring pointer 52, a character wheel set 6, a middle drive coupling wheel 62, a transmission intermediate wheel 7, an upper clamping plate 42, a transparent meter cover 8 and a PCBA plate 9 provided with a main control circuit from bottom to top.
The impeller box 3 is mounted in the case 2, and the impeller 31 is placed in the impeller box 3, and when a metered amount of aqueous medium flows through the impeller box 3, the flowing aqueous medium stirs the impeller 31 to rotate. The counter box 4 is mounted above 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 set 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 the driving wheel.
The character wheel group 6 consists of a plurality of character wheels which can directly read (direct reading means that data can be directly read by naked eyes) by digital display, wherein each character wheel in the character wheel group 6 is arranged in parallel from small to large and comprises character wheels which display cubic orders of magnitude of units, tens, hundreds, thousands and tens (more orders of magnitude can be arranged), all the character wheels are assembled on a character wheel shaft, 0-9 digital characters are sequentially and equidistantly arranged on the circumferential side wall of each character wheel at intervals, carry coupling wheels are arranged between two adjacent character wheels, the lower position rotates one circle, and the adjacent upper position rotates one digit.
The upper clamping plate 42 is provided with a direct reading window 81 for reading the metering value of each character wheel at a position opposite to each character wheel in the character wheel group 6.
The transparent cover 8 is made of a non-magnetic material and is fixedly connected to the top end of the case 2, and is used for not only packaging the counter case 4, the upper clamping plate 42 arranged in the counter case 4, the lower clamping plate 41, the gear transmission assembly 5 and the character wheel set 6 in the case 2, but also observing the metering values of the character wheels in the character wheel set 6.
As shown in fig. 5, a plurality of pointers, such as one tenth, one hundredth, one thousandth and one ten thousandth cubic orders, for displaying low-order measurement values in a pointer rotation form are provided at positions opposite to the character wheel set 6 under the transparent meter cover 8, and each pointer is fixedly connected with a single-order driving gear in the gear transmission assembly 5, and the driving gear corresponding to the one ten thousandth counting pointer is hereinafter referred to as a lowest-order gear 51.
As shown in fig. 1, 2, 3, 4, 5, 8 and 9, a monitor pointer 52 reflecting whether the metering fluid flows is provided below the transparent meter cover 8 and beside the pointer disk 63, and the monitor pointer 52 rotates synchronously with the lowest gear 51 through a gear set 53 at the lower end of the monitor pointer 52, and the transmission ratio between the monitor pointer and the lowest gear is 1:1.
as shown in fig. 3, 5, 6and 7, a driving gear for driving the pointer with the highest magnitude (namely, the magnitude 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 are provided with a transmission intermediate wheel 7 and a middle drive coupling wheel 62.
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 for driving the pointer with the highest magnitude rotates for ten circles, the intermediate wheel 7 rotates for one circle), meanwhile, the intermediate wheel 7 is meshed with the intermediate drive coupling wheel 62, the intermediate drive coupling wheel 62 is parallel and coaxial with the character wheel set 6, and the intermediate wheel 7 is meshed with the intermediate drive coupling wheel 62 in an intersecting manner.
The transmission ratio among the transmission intermediate wheel 7, the intermediate drive coupling wheel 62 and the unit character wheel 61 is 1:1:1. that is, the intermediate transmission wheel 7 rotates once, the intermediate drive coupling wheel 62 rotates once, and the unit character wheel 61 also rotates once.
A permanent magnetic sheet 93 which is arranged with opposite magnetic poles along the radial direction is fixed at the center of the upper surface (i.e. spoke surface) of the transmission intermediate wheel 7, and a magnetic induction angle sensor 92 (i.e. an angle detection chip U5 in the circuit) is arranged at the position opposite to the permanent magnetic sheet 93 outside the transparent meter cover 8 correspondingly. The angle sensor 92 captures the rotational angle of the permanent magnet sheet 93 in real time, so as to acquire intermediate wheel position information (i.e., the rotational position of the intermediate wheel 7, corresponding to digital information on the unit character wheel 61 facing the direct-reading window 81 of the water meter 1). Namely, when the permanent magnet sheet 93 rotates 0.1 circle, 0.2 circle, half circle … or 0.9 circle along with the transmission intermediate wheel 7 from the initial position (0 number), the angle sensor 92 can detect that the number of the direct reading window 81 of the water meter 1 on the position print wheel 61 corresponds to 1, 2, 5 … or 9 integer phase respectively.
The angle sensor 92 employed in the present invention may have an angle detection accuracy as small as 0.1 degrees.
In the gear transmission assembly 5, the transmission ratio between two adjacent low-level metering driving gears is 10 from small to large: 1 (i.e., the lower pointer rotates ten times and the adjacent upper pointer rotates one time).
A detecting unit 91 for detecting low-order pointer rotation information of the lowest-order gear 51 is provided on the transparent cover 8 at a position corresponding to the monitor pointer 52, the low-order pointer rotation information being: when the lowest gear 51 rotates, forward rotation (forward direction means the rotation direction of the impeller 31 when the water meter 1 is normally using water), reverse rotation (reverse direction means the reverse rotation of the impeller 31 due to external interference factors or the reverse rotation of the impeller 31 caused by intentional actions of individual water thieves), micro rotation information due to shaking of the impeller 31 due to external interference, and rotation number information corresponding to the forward rotation and the reverse rotation.
The detecting unit 91 sends the low-level pointer electrical signal corresponding to the low-level pointer rotation information to the main control chip U8, and after the main control chip U8 discriminates (eliminates the electronic count generated by jitter and reverse rotation), sends the pointer electrical signal corresponding to the table number of the wireless water meter 1 and the accumulated electronic count value of the pointer group to the main node device (the main node device includes a digital second water meter gateway, and a mobile terminal loaded with special APP software and held by a user) in a broadcast communication mode through the bluetooth chip U4.
The accumulated electronic count value of the pointer group refers to the electronic count value of the pointers of one tenth, one hundredth, one thousandth and one ten thousandth of a bit cube orders of magnitude calculated by the main control chip U8 according to the rotation information of the low-order pointer acquired by the detection component 91.
The detecting part 91 may be a hall sensor assembly, a photoelectric sensor assembly, a mechanical sensor assembly, or the like. The preferred detection component of the present invention is a hall sensor assembly comprising three hall sensors (i.e., three hall chips), correspondingly, a permanent magnet for detection is provided on the monitoring pointer 52, the three hall sensors are distributed around the periphery of the monitoring pointer 52, and the included angle between two adjacent hall sensors in the three hall sensors is preferably 120 degrees.
The three Hall sensors are arranged to effectively identify whether the lowest gear 51 rotates in the forward direction or in the reverse direction, and simultaneously, the micro-rotation phenomenon generated by the lowest gear 51 due to the vibration of the pipeline can be accurately and timely captured.
The pulse output sequences generated by the three hall sensors corresponding to the forward rotation and the reverse rotation are different. The lowest gear 51 is mostly rotated back and forth in the rest position in a reciprocating and slow manner, and at least one of the three hall sensors does not output a pulse signal because the lowest gear 51 does not perform a complete circular motion.
After the detection unit 91 detects that the lowest gear 51 is in a normal rotation state, the angle sensor 92 periodically sends the acquired intermediate wheel electric signal corresponding to the intermediate wheel position information to a main control chip U8 in a main control circuit.
The main control chip U8 sends the digital second through water meter 1 with the number and the number wheel group accumulated electronic count value corresponding to the number wheel electric signal to the main node equipment with the distance of 200 m from the wireless water meter 1 in a broadcasting communication mode through the Bluetooth chip U4 in the main control circuit.
The accumulated electronic count value of the character wheel set refers to the electronic count value of the measured units, tens, hundreds, thousands and tens of thousands of cubic order character wheels calculated by the main control chip U8 according to the intermediate wheel position information acquired by the angle sensor 92 and the accumulated intermediate wheel rotation number.
In order to reduce the accumulated errors of the accumulated electronic count value of the pointer group and the accumulated electronic count value of the character wheel group caused by external interference factors, when the intermediate wheel position information sent by the angle sensor 92 to the main control chip U8 is that the unit character wheel 61 rotates to a positive digit value (the positive digit value refers to when the number of the unit character wheel 61, which is right opposite to 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 counts again.
The purpose of the above zero clearing is to realize the mutual calibration of the pointer group accumulated count value and the character wheel group accumulated electronic count value. Theoretically, when the accumulated electronic count value of the pointer set reaches 1000 liters, the number corresponding to the direct reading of the unit character wheel 61 should reach 1 cube; in fact, due to the interference of external factors, generally, when the direct reading of the unit character wheel 61 reaches 1 cube, the corresponding accumulated electronic count value of the pointer group is often about 1000 liters, in order to eliminate the count error caused by the accumulated electronic count value of the pointer group, when the direct reading of the unit character wheel 61 reaches the positive numerical value, the accumulated electronic count value of the pointer group is cleared, so that the error is prevented from being infinitely amplified in the long-time use process, the accurate metering of the whole water meter 1 is ensured, and the requirement of customers on the accurate metering is met.
2. And a master control circuit.
As shown in fig. 10, 11 and 12, the main control circuit comprises 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 mainly comprises three Hall chips, namely a first Hall chip U1, a second Hall chip U2 and a third Hall chip U3.
Three Hall components are adopted to realize forward and reverse rotation metering and sampling of a pointer of 0.0001 cube of the water meter, and the water meter can meter to 1 liter to monitor transient flow.
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-level pointer electric signals) corresponding to the rotation number and the rotation direction of the lowest-level 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 ends.
The main control chip U8 is respectively and sequentially independently powered for 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, so that the circuit power consumption is reduced.
When water flows in the water meter 1, the three Hall chips sense the magnetic field intensity of the magnet in sequence, and the sufficient magnetic field intensity enables the three Hall chips to output low level to the main control chip U8 in sequence, and the interrupt trigger circuit in the main control chip U8 triggers the interrupt count pulse number, so that the ascending metering is realized.
2. And the angular displacement direct-reading sampling circuit.
The water meter mainly comprises an angle detection chip U5 which detects the rotation angle value of the water meter unit character wheel 61, namely, samples the reading of the unit character wheel 61, and ensures that the water meter 1 can not have accumulated errors in long-term use.
The angle detection chip U5 transmits the acquired 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 intermediate wheel electric signals respectively.
When the main control chip U8 reads the intermediate wheel position information, the 16 th pin supplies power for the angle detection chip U5, so that the power consumption of the whole circuit can be effectively reduced.
When the water meter 1 bit character wheel 61 rotates, the angle detection chip U5 outputs voltage signals (ADX+, ADY+, namely intermediate wheel electric signals) which are in sine and cosine relation with the angle of the magnetic field, the voltage signals are transmitted to the main control chip U8 through the 3 rd pin and the 5 th pin of the voltage signals, and the indication value of the current bit character wheel 61 is calculated through the main control chip U8, so that the direct reading function of the bit character wheel 61 is realized.
3. Bluetooth transceiver circuitry.
The wireless Bluetooth communication system mainly comprises a wireless Bluetooth chip U4 which is in wireless data exchange with the main node equipment under the control of a main control chip U8. Which connects with the master node device by means of broadcast communication, i.e. without pairing.
The main control chip U8 transmits the accumulated electronic count values of the meter number and the character wheel set of the water meter 1 to the 15 th and 16 th pins of the wireless Bluetooth chip U4 in a serial port communication mode through the 9 th pin and the 8 th pin of the main control chip, and the wireless Bluetooth chip U4 transmits the accumulated electronic count values to the main 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 for resetting the relevant parameters of the wireless water meter 1 (the relevant parameters include the detection period setting of the angle sensor 92, the water valve opening or closing, the battery power consumption detection 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 the 7 th foot, so that the battery provides stable 3.0V working voltage for the wireless Bluetooth chip U4.
The main frequency crystal oscillation circuit of the wireless Bluetooth chip U4 consists of a capacitor C29, a capacitor C30 and a capacitor Y1.
The clock crystal oscillation circuit of the wireless Bluetooth chip U4 consists of a capacitor C19, a capacitor C20 and a capacitor 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 after being connected together, the first resistor is connected between the other ends of the second capacitor and the third capacitor in a bridging mode, one end of the first resistor is connected with the 2 nd pin of the 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 transceiver circuit.
The main control circuit further comprises a filter circuit of the Bluetooth receiving and transmitting 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 filter circuit after being connected in parallel is connected with the 1 st pin of the Bluetooth chip U4, the other end of the filter circuit after being connected in parallel is grounded through the ninth capacitor, the other end of the filter circuit is connected with the 31 st pin of the Bluetooth chip U4, the other end of the filter circuit is connected with a common connection end of one end of the second inductor and the anode of the first diode, and the other end of the second inductor is connected with the 27 th pin of the Bluetooth chip U4.
6. And a voltage detection circuit.
The main control circuit further comprises a voltage dividing 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 is connected with the fourteenth capacitor in parallel, one end of the ninth resistor is grounded, the other end of the ninth resistor is connected with the 3 rd pin of the main control chip U8 in one path, and the other path of the ninth resistor is connected with the voltage output end of the 3.6V battery through the eighth resistor. The model of the main control chip U8 is HC32L110C4UA, the model of the three Hall chips is S-5716ANDL1-M3T1U, the model of the angle detection chip U5 is MMA253F, the model of the wireless Bluetooth chip U4 is ATB1103, and the model of the voltage stabilizing chip U6 is S-1206B30-M3T1U.
7. And a battery.
A 3.6V disposable lithium-thionyl chloride battery is preferred.
The battery outputs stable direct current working voltage to the main control chip U8 through the voltage stabilizing chip U6. .
Claims (7)
1. The utility model provides a be applied to digital second through water gauge of water gauge thing networking, includes a plurality of direct-reading high-order metering number's word wheel, a plurality of pointer that show low-order metering number and the transmission intermediate wheel (7) between the pointer of measuring unit cube order of magnitude unit word wheel (61) and measuring tenth bit cube order of magnitude, and transmission intermediate wheel (7) meshes with unit word wheel (61), and the transmission ratio between them is 1:1, a step of; the transmission intermediate wheel (7) is meshed with a driving gear for driving the pointer of the order of magnitude of one tenth of a cubic meter 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 in the radial direction by opposite magnetic poles is arranged in the center of the upper surface of the transmission intermediate wheel (7), a magnetic induction angle sensor (92) is arranged at the position above the transparent meter cover (8) of the water meter (1) and opposite to the permanent magnetic sheet (93), a monitoring pointer (52) which reflects whether the metering fluid flows is arranged below the transparent meter cover (8) and beside the pointer disc (63), the monitoring pointer (52) synchronously rotates with the lowest-order gear (51) of the metering ten-thousandth cubic order pointer through a gear group (53) at the lower end of the monitoring pointer (52), and a detection part (91) which can detect the rotation information of the lowest-order pointer is arranged above the transparent meter cover (8) and at the position corresponding to the monitoring pointer (52); the angle sensor (92) sends the acquired intermediate wheel electric signal corresponding to the intermediate wheel position information of the rotation of the transmission intermediate wheel (7) to a main control chip U8 in a main control circuit at regular time after the detection part (91) detects that the lowest-order gear (51) is in a normal rotation state, the detection part (91) sends the low-order pointer electric signal corresponding to the low-order pointer rotation information to the main control chip U8, and the low-order pointer rotation information comprises the rotation direction of the lowest-order gear (51) and the corresponding rotation number of turns; the main control chip U8 regularly transmits a character wheel electric signal corresponding to the meter number of the water meter (1) and the accumulated electronic count value of the character wheel group to main node equipment which is far from the water meter (1) by a Bluetooth chip U4 in a broadcasting communication mode, and transmits the character wheel electric signal to a background water service management center by the Internet;
the detection part (91) is composed of three Hall sensors, and the main control chip U8 sends pointer electric signals corresponding to the meter number of the water meter (1) and the pointer group accumulated electronic count value to the main node equipment in a broadcast communication mode through the Bluetooth chip U4;
when the intermediate wheel position information detected by the angle sensor (92) is a positive value of a bit character wheel (61), the main control chip U8 clears the accumulated electronic count value of the pointer group stored in the intermediate wheel position information;
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-level pointer electric signals acquired by the first Hall chip U1, the second Hall chip U2 and the third Hall chip U3 to a 20 th pin, a2 nd pin and a 19 th pin of the main control chip U8 through corresponding pulse output ends; the angle detection chip U5 transmits the acquired 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 intermediate wheel electric signals respectively; the main control chip U8 sends the meter number of the water meter (1), the accumulated electronic count value of the character wheel group and the accumulated electronic count value of the pointer group to the 15 th and 16 th pins 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 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 respectively; the main control chip U8 supplies power to 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 respectively; the main control chip U8 supplies power to the angle detection chip U5 through the 16 th pin.
2. The digital second through water meter applied to the internet of things of the water meter according to claim 1, 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 after being connected together, the first resistor is connected between the other ends of the second capacitor and the third capacitor in a bridging mode, one end of the first resistor is connected with the 2 nd pin of the Bluetooth chip U4, and the other end of the first resistor is connected with the other end of the pi-type antenna ANT.
3. The digital second through water meter applied to the internet of things of the water meter according to claim 2, wherein: the main control circuit further comprises a filter circuit of the Bluetooth receiving and transmitting 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 filter circuit after being connected in parallel is connected with the 1 st pin of the Bluetooth chip U4, the other end of the filter circuit after being connected in parallel is grounded through the ninth capacitor, the other end of the filter circuit is connected with the 31 st pin of the Bluetooth chip U4, the other end of the filter circuit is connected with a common connection end of one end of the second inductor and the anode of the first diode, and the other end of the second inductor is connected with the 27 th pin of the Bluetooth chip U4.
4. The digital second through water meter for water meter internet of things according to claim 3, wherein: the main control circuit further comprises a voltage dividing circuit which is formed by 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 is connected with the fourteenth capacitor in parallel, one end of the parallel connection is grounded, the other end of the parallel connection is connected with the 3 rd pin of the main control chip U8, and the other end of the parallel connection is connected with the voltage output end of the 3.6V battery through the eighth resistor.
5. The digital second through water meter for water meter internet of things according to claim 4, wherein: the model of the main control chip U8 is HC32L110C4UA, the model of the three Hall chips is S-5716ANDL1-M3T1U, the model of the angle detection chip U5 is MMA253F, the model of the Bluetooth chip U4 is ATB1103, and the model of the voltage stabilizing chip U6 is S-1206B30-M3T1U.
6. The digital second through water meter for water meter internet of things according to claim 5, wherein: the 3.6V battery is a disposable lithium-thionyl chloride battery.
7. The digital second through water meter applied to the internet of things of the water meter according to claim 1, wherein: the main node equipment is a digital second through water meter gateway or a mobile terminal which is held by a user and downloads special APP software.
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| CN110232801A (en) * | 2019-05-09 | 2019-09-13 | 刘伟成 | A kind of theft preventing method for bluetooth water meter |
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| US11095960B2 (en) * | 2018-03-07 | 2021-08-17 | Michael Edward Klicpera | Water meter and leak detection system having communication with a intelligent central hub listening and speaking apparatus, wireless thermostat and/or home automation system |
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| CN110232801A (en) * | 2019-05-09 | 2019-09-13 | 刘伟成 | A kind of theft preventing method for bluetooth water meter |
| CN111337088A (en) * | 2020-04-16 | 2020-06-26 | 广东捷先智能制造有限公司 | Structure of direct reading counter and mechanical meter with same |
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