CN103017847A - Signal transmission and calculation method for vortex electronic type water meter and heat meter - Google Patents
Signal transmission and calculation method for vortex electronic type water meter and heat meter Download PDFInfo
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- CN103017847A CN103017847A CN2011102832846A CN201110283284A CN103017847A CN 103017847 A CN103017847 A CN 103017847A CN 2011102832846 A CN2011102832846 A CN 2011102832846A CN 201110283284 A CN201110283284 A CN 201110283284A CN 103017847 A CN103017847 A CN 103017847A
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Abstract
The invention relates to a signal transmission and calculation method for a vortex electronic type water meter and heat meter. One or more metal or nonmetal vortex water meter cores are arranged in a cylindrical meter shell main body (11), a non-magnetic hollow pipe joint (34) is arranged in a T-shaped connection pipe of the meter shell main body (11) and is internally provided with a magnetic sensor or metal sensor (36), and the magnetic sensor or metal sensor (36) is just aligned with a signal triggering magnet or metal sheet (7) on a blade of a turbine (8) of the vortex water meter core. As long as the time when the turbine of the vortex water meter core rotates for one circle or a certain angle is measured, no matter whether the measured time is of an equal time point which can be found out in function data (m--tau) of a data memory or not, a time interval (tau n+1 to tau n) in which the time (tau I) is arranged can be utilized, and linear modification is carried out by utilizing the function data of the time interval (m--tau), thus the practically measured fluid amount (mI) when an impeller rotates for one circle or the certain angle can be modified to be close to an actual value.
Description
Technical field:
The invention belongs to water meter and heat energy meter, relate in particular to signal transmission and the computing method of a kind of vortex electric water meter and heat energy meter.
Background technology:
At present, the heavy caliber and small-bore intellectual water meter and the heat energy meter that are used for various places, great majority adopt mechanical drive or ultrasound wave to make, its metering is shaped to decade by transmitting gear engagement and the periodic transmission ultrasonic signal reaches the metering purpose, the structure of these tables is more complicated all, measuring accuracy is lower, or the low discharge insufficient sensitivity in when metering.
The invention provides a solution, it can make the structure of intellectual water meter and heat energy meter become simple and reliable, and measuring accuracy can improve greatly.
Summary of the invention:
The present invention be achieved in that it be in metal or the nonmetal watchcase main body cylindraceous of making, pack into one or more with metal or the nonmetal vortex water meter movement of making, this vortex water meter movement is to embed one or more shaft base and rotating shaft rings made from high-abrasive material in the center of two rectification supports, its rotating shaft ring is that endoporus is inverted cone-shaped, and the turbine of packing in the centre of two rectification supports, be fixed with one or more signals on a plurality of blades of turbine and trigger magnet or sheet metal, the rotating shaft of turbine is made of high-abrasive material, and the two ends of the rotating shaft of turbine are inserted respectively in the rotating shaft ring that the rectification carriage center embeds and consisted of; Then connect hermetically with the end of inlet/outlet pipe O-ring seal with the watchcase main body with water inlet pipe and water outlet pipe; The other end in the watchcase main body, adopt valve through hole ball, spring washer, valve sealing ring, water inlet pipe and water outlet pipe, inlet/outlet pipe O-ring seal and valve rod and valve stem packing ring to form the valve with ball valve function, valve through hole ball then is to be processed with one or more apertures formations that run through at the vertical of the macropore of valve through hole ball or the vertical direction of standard; The blank pipe joint of packing into non-magnetic at the side joint pipe place of watchcase main body, in the wiring board of magneto sensor or metal sensor is housed in the blank pipe joint and with fluid sealant it is potted in, magneto sensor or metal sensor are just in time aimed at the triggering magnet of the signal on the turbo blade or sheet metal on the vortex water meter movement, and the signal conductor of magneto sensor or metal sensor is drawn and entered in the valve control caisson and with circuit controller to be connected; Be incorporated with the electrode contact of electrode at another side joint pipe place of watchcase main body, the electrode of the in-built useful insulating sheath of electrode contact also is potted in the back segment of its electrode interior and exposes electrode tip with fluid sealant, and the signal conductor of electrode is drawn and entered in the valve control caisson and with circuit controller to be connected; The reducing gear and motor and circuit controller and the LCD display that are connected with the valve rod of energy by-pass valve control through hole ball rotation are housed in the valve control caisson, the waterproof of valve control caisson then is to be on the one hand with watchcase main body junction with soft seal circle wringing fit, then be the soft seal circle of loading onto first rectangle groove at the opening portion of valve control caisson on the other hand, allow the sealing circle ride over the marginal portion of the opening of valve control caisson, and then with one or more glands transparent and that the wedge pin is arranged, the soft seal circle that rectangle groove is arranged of edge that will ride over the opening of valve control caisson with screw compresses, so that it reaches the ability that electronics and control section have waterproof.
When being arranged, tap water flows through when of the present invention, the kinetic energy of tap water will promote turbine rotation, the signal triggering magnet that is fixed on the turbo blade will periodically trigger the magneto sensor that is fixed in the blank pipe joint, magneto sensor will outwards send electric impulse signal, the circuit controller that is comprised of computer chip (MCU) will utilize these pulse signals to calculate the tap water volume of the invention of flowing through of each pulse signal representative, flowing through of each pulse signal representative tap water volume of the present invention is added up, and is exactly the semi-invariant of the present invention's tap water that will measure.Its computing method are as follows:
To make every rotation one circle of turbine in the movement of the present invention or rotate the required Fluid Volume of certain angle (m) be different under different flow for water of the present invention or other liquid owing to flow through, if we will make measuring accuracy of the present invention reach very high, just must be at as much as possible flow point to every rotation one circle of the turbine in the movement of the present invention of flowing through or rotate the required Fluid Volume of certain angle (m) and measure; In addition, each only shows to rotate a circle or rotate the required Fluid Volume of certain angle (m) in same traffic also is different, so in order to make every table that good measuring accuracy be arranged, just must carry out the demarcation that flow point as much as possible makes the every rotation one of turbine in the movement of the present invention enclose or rotate the required Fluid Volume of certain angle (m) to every table.
In order to overcome the above problems, the present invention is such Flow through the cumulative flow scale of construction (M) of water of the present invention or other liquid: to the accessory made with a collection of same material and the base table that forms, assembling is installed on the correction platform after finishing in batch, and shows from minimum flow (q at this
1) to maximum flow (q
4) between except minimum flow (q
1), boundary flow (q
2) and flow (q commonly used
3) and maximum flow (q
4) outside, also will be at minimum flow (q
1) to maximum flow (q
4) between inserted more various flow point, and its each flow point made every rotation one circle of turbine in the movement of the present invention or rotate the required Fluid Volume of certain angle (m) and turbine rotation one is enclosed or rotated the required time of certain angle (τ) and measure simultaneously, and with each turbine rotation one circle or rotate certain Fluid Volume that angle is flowed through (m) and turbine rotation one circle or rotate the required time of certain angle (τ) and draw out (m--τ) functional arrangement, the measurement point that certain Fluid Volume that angle is flowed through (m) was enclosed or rotated to the turbine rotation one that the required time of certain angle (τ) was enclosed or rotated to adjacent two turbine rotation one couples together with straight line.Like this, as long as the flow point that inserts is abundant, this (m--τ) function line is just more close to the actual value of base table, (the m--τ) of measured base table concluded and draws in the computing machine that public (m--τ) function line is stored in the base table of demarcating required production.
The present invention in use, when having water or other liquid to flow through when of the present invention, every rotation one circle of the turbine of movement or rotate certain angle in the present invention, we just can measure this circle of turbine rotation or rotate the required time (τ of certain angle
I), and will this circle of the measured turbine rotation of this time or rotate the required time (τ of certain angle
I) be recorded in the storer of single-chip microcomputer (MCU), and replace last stored time (τ in the storer of single-chip microcomputer (MCU)
I-1), the Fluid Volume (m that certain angle is surveyed out is enclosed or rotates in the every rotation one of turbine that then just can find timing signal to deposit in from the base table data-carrier store by the single-chip microcomputer among the present invention (MCU) chip
I); Concrete is with turbine rotation one circle or rotates the measured time (τ of certain angle
I) find the time (τ at place in the base table data-carrier store in stored (m--τ) function data
I) time interval (τ
nTo τ
N+1), then look every rotation one circle of this time interval turbine or rotate the Fluid Volume (m that certain angle is surveyed out
I) be linear change, if:
τ
I-τ
I-1≥τ
0........................................(1)
In the formula: τ
IWhen inferior this circle of measured turbine rotation or rotate the required time of certain angle;
τ
I-1Last this circle of measured turbine rotation or rotate the required time of certain angle;
τ
0Initial-flow point (q
0) time this circle of turbine rotation or rotate the required time of certain angle;
Then revise in the following manner:
m
I＝(m
1+m
4)/2......................................................................(2)
In the formula: m
I: be that the Fluid Volume that certain angle is surveyed out is enclosed or rotated to turbine rotation one;
m
1: be minimum flow (q
1) put in timing signal turbine rotation one and enclose or rotate the Fluid Volume of certain angle;
m
4: be maximum flow point (q
4) enclose or rotate the Fluid Volume of certain angle in timing signal turbine rotation one;
If:
τ
I-τ
I-1≤τ
1.......................................(3)
In the formula: τ
IWhen inferior this circle of measured turbine rotation or rotate the required time of certain angle;
τ
I-1Last time this circle of measured turbine rotation or rotate the required time of certain angle;
τ
1This circle of turbine rotation or rotate the required time of certain angle during minimum flow point (q1);
Then revise in the following manner:
m
I＝m
n+(m
n+1-m
n)(τ
I-τ
n)/(τ
n+1-τ
n)........................(4)
In the formula: m
IThat the Fluid Volume that certain angle is surveyed out is enclosed or rotated to turbine rotation one;
m
nInherent certain the flow point (q of base table data-carrier store
n) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through;
m
N+1Inherent certain the flow point (q of base table data-carrier store
n) adjacent flow point (q
N+1) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through;
τ
IThat turbine rotation one is enclosed or rotated the measured time of certain angle;
τ
nInherent certain the flow point (q of base table data-carrier store
n) time turbine rotation one circle or rotate the required time of certain angle;
τ
N+1Inherent certain the flow point (q of base table data-carrier store
n) adjacent flow point (q
N+1) time turbine rotation one circle or rotate certain angle required time.
If:
τ
1≤τ
I-τ
I-1≤τ
0..................................(5)
In the formula: τ
1Minimum flow point (q
1) time this circle of turbine rotation or rotate the required time of certain angle;
τ
IWhen inferior this circle of measured turbine rotation or rotate the required time of certain angle;
τ
I-1Last time this circle of measured turbine rotation or rotate the required time of certain angle;
τ
0Initial-flow point (q
0) time this circle of turbine rotation or rotate the required time of certain angle;
Then revise in the following manner:
m
I＝m
1+(m
0-m
1)(τ
I-τ
1)/(τ
0-τ
1)...............................(6)
In the formula: m
IThat the Fluid Volume that certain angle is surveyed out is enclosed or rotated to turbine rotation one;
m
1The inherent minimum flow point of base table data-carrier store (q
1) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through;
m
0The inherent initial-flow point of base table data-carrier store (q
0) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through;
τ
IThat turbine rotation one is enclosed or rotated the measured time of certain angle;
τ
1The inherent minimum flow point of base table data-carrier store (q
1) time turbine rotation one circle or rotate the required time of certain angle;
τ
0The inherent initial-flow point of base table data-carrier store (q
0) time turbine rotation one circle or rotate certain angle required time;
Finish turbine rotation one circle or rotated the Fluid Volume (m that certain angle is surveyed out
I) correction after, as long as we are with all turbine rotation one circle or rotate the value of certain angle through revising and add up and can draw flow through water of the present invention or other accumulation of fluid Fluid Volume (M):
M＝∑m
I............................................(7)
The invention has the advantages that: when actual metered, as long as measure in it in movement turbine rotation one circle or rotate the used time of certain angle, no matter whether this time finds equal time point in (the m--τ) of data-carrier store function data, can adopt this time (τ
I) time interval (τ at place
N+1To τ
n), and carry out linear revise with (m--τ) function data of this time interval, just can or rotate the Fluid Volume (m that certain angle is surveyed out with its wheel rotation one circle
I) be adapted near actual value; And the insertion point in (m--τ) function data is more, and the Fluid Volume (m that certain angle is surveyed out is enclosed or rotated to the turbine rotation one that is corrected
I) just more near its actual value.
Description of drawings:
Fig. 1 is cut-open view of the present invention
Among the figure: 1, magnetic filtering ring; 2, stainless steel wire screen pack; 3, the cap that meets water; 4, shaft base; 5, rotating shaft ring; 6, locating sleeve; 7, signal triggers magnet or sheet metal; 8, turbine; 9, rotating shaft; 10, rectification support; 11, watchcase main body; 12, watch glasses lower body; 13, inlet/outlet pipe O-ring seal; 14, valve seal seat cushion; 15, water inlet pipe and water outlet pipe; 16, valve seal block bracket; 17, spring washer; 18, valve seal seat; 19, valve through hole ball; 20, valve stem sleeve O-ring seal; 21, valve stem sleeve; 22, valve stem packing ring; 23, valve rod attachment screw; 24, valve rod; 25, dust cover rotating shaft; 26, dust cover; 27, watch glasses upper body; The gland that 28, the wedge pin is arranged; The soft seal circle that 29, rectangle groove is arranged; 30, electrode contact; 31, electrode; 32, valve control caisson; 33, battery door is put and is torn screw open; 34, blank pipe joint; 35, battery door cover plate 36, magneto sensor or metal sensor; 37, wiring board; 38, fluid sealant; 39, battery door screw; 40, soft seal circle.
Embodiment:
The present invention be achieved in that it be in metal or the nonmetal watchcase main body cylindraceous (11) of making, pack into one or more with metal or the nonmetal vortex water meter movement of making, this vortex water meter movement is to embed one or more shaft bases made from high-abrasive material (4) and rotating shaft ring (5) in the center of two rectification supports (10), its rotating shaft ring (5) is inverted cone-shaped for endoporus, and the turbine assembly of packing in the centre of two rectification supports (10), be fixed with one or more signals on a plurality of blades of turbine (8) and trigger magnet or sheet metal (7), the rotating shaft (9) of turbine (8) is made of high-abrasive material, and the two ends of the rotating shaft (9) of turbine (8) are inserted respectively in the rotating shaft ring (5) that rectification support (10) center embeds and consisted of; Then use water inlet pipe and water outlet pipe (15) to be connected 13 with the inlet/outlet pipe O-ring seal) end of watchcase main body (11) is connected hermetically; The other end in watchcase main body (11), adopt valve through hole ball (19), spring washer (17), valve seal seat (18), water inlet pipe and water outlet pipe (15), inlet/outlet pipe O-ring seal (13) and valve rod (24) and valve stem packing ring (22) to form the valve with ball valve function, valve through hole ball (19) then is to be processed with one or more apertures formations that run through at the vertical of the macropore of valve through hole ball (19) or the vertical direction of standard; The blank pipe joint (34) of packing into non-magnetic at the side joint pipe place of watchcase main body (11), in the wiring board (37) of magneto sensor or metal sensor (36) is housed in the blank pipe joint (34) and with fluid sealant (38) it is potted in, the signal that magneto sensor or metal sensor (36) are just in time aimed on turbine on the vortex water meter movement (8) blade triggers magnet or sheet metal (7), and the signal conductor of magneto sensor or metal sensor (36) is drawn and entered in the valve control caisson (32) and with circuit controller to be connected; Be incorporated with the electrode contact (30) of electrode at another side joint pipe place of watchcase main body (11), the electrode (31) of the in-built useful insulating sheath of electrode contact (30) also is potted in the back segment of its electrode (31) interior and exposes electrode tip with fluid sealant, and the signal conductor of electrode (31) is drawn and entered in the valve control caisson (32) and with circuit controller to be connected; The reducing gear and motor and circuit controller and the LCD display that are connected with the valve rod (24) of energy by-pass valve control through hole ball (19) rotation are housed in the valve control caisson (32), the waterproof of valve control caisson (32) then is to be on the one hand with watchcase main body (11) junction with soft seal circle (40) wringing fit, then be the soft seal circle (29) of loading onto first rectangle groove at the opening portion of valve control caisson (32) on the other hand, allow the sealing circle ride over the marginal portion of the opening of valve control caisson (32), and then with one or more glands (28) transparent and that the wedge pin is arranged, the soft seal circle (29) that rectangle groove is arranged of edge that will ride over the opening of valve control caisson (32) with screw compresses, so that it reaches the ability that electronics and control section have waterproof.
Claims (7)
1. signal transmission and the computing method of vortex water meter and heat energy meter, it is characterized in that: be in metal or the nonmetal watchcase main body cylindraceous (11) of making, pack into one or more with metal or the nonmetal vortex water meter movement of making, then use water inlet pipe and water outlet pipe (15) to be connected 13 with the inlet/outlet pipe O-ring seal) end of watchcase main body (11) is connected hermetically, the other end in watchcase main body (11), adopt valve through hole ball (19), spring washer (17), valve seal seat (18), water inlet pipe and water outlet pipe (15), inlet/outlet pipe O-ring seal (13), and valve rod (24) and valve stem packing ring (22) composition valve, pack blank pipe joint (30) into non-magnetic in T adapter place of watchcase main body (11), magneto sensor (35) is housed in the blank pipe joint (30), and the signal that magneto sensor (35) is just in time aimed on turbine on the vortex water meter movement (8) blade triggers magnet (7).
2. according to claim 1 signal transmission and the computing method of described vortex water meter and heat energy meter, it is characterized in that: when the kinetic energy of tap water promotes turbine (8) rotation, the signal triggering magnet (7) that is fixed on turbine (8) blade periodically triggers the magneto sensor (35) that is fixed in the blank pipe joint (30), magneto sensor (35) will outwards send electric impulse signal, the circuit controller that is comprised of computer chip (MCU) will utilize these pulse signals to calculate the tap water volume of the invention of flowing through of each pulse signal representative, flowing through of each pulse signal representative tap water volume of the present invention is added up, and is exactly the semi-invariant of the present invention's tap water that will measure.
3. according to claim 1 signal transmission and the computing method of described vortex water meter and heat energy meter, it is characterized in that: the every rotation one of turbine (8) is enclosed or is rotated certain angle, then measures turbine (8) and rotates this circle or rotate the required time (τ of certain angle
I), and the measured turbine of this time (8) rotated this circle or rotate the required time (τ of certain angle
I) be recorded in the storer of single-chip microcomputer (MCU).
4. according to claim 1 signal transmission and the computing method of described vortex water meter and heat energy meter is characterized in that: if:
τ
I-τ
I-1≥τ
0........................................(1)
In the formula: τ
IWhen inferior this circle of measured turbine rotation or rotate the required time of certain angle,
τ
I-1Last time this circle of measured turbine rotation or rotate the required time of certain angle,
τ
0Initial-flow point (q
0) time this circle of turbine rotation or rotate the required time of certain angle,
Then revise in the following manner:
m
I＝(m
1+m
4)/2..................................................................................(2)
In the formula: m
I: be that the Fluid Volume that certain angle is surveyed out is enclosed or rotated to turbine rotation one,
m
1: be minimum flow point (q
1) enclose or rotate the Fluid Volume of certain angle in timing signal turbine rotation one,
m
4: be maximum flow point (q
4) enclose or rotate the Fluid Volume of certain angle in timing signal turbine rotation one.
5. according to claim 1 signal transmission and the computing method of described vortex water meter and heat energy meter is characterized in that: if:
τ
I-τ
I-1≤τ
1......................................(3)
In the formula: τ
IWhen inferior this circle of measured turbine rotation or rotate the required time of certain angle,
τ
I-1Last time this circle of measured turbine rotation or rotate the required time of certain angle,
τ
1Minimum flow point (q
1) time this circle of turbine rotation or rotate the required time of certain angle,
Then revise in the following manner:
m
I＝m
n+(m
n+1-m
n)(τ
I-τ
n)/(τ
n+1-τ
n).............................(4)
In the formula: m
IThat the Fluid Volume that certain angle is surveyed out is enclosed or rotated to turbine rotation one,
m
nInherent certain the flow point (q of base table data-carrier store
n) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through,
m
N+1Inherent certain the flow point (q of base table data-carrier store
n) adjacent flow point (q
N+1) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through,
τ
IThat turbine rotation one is enclosed or rotated the measured time of certain angle,
τ
nInherent certain the flow point (q of base table data-carrier store
n) time turbine rotation one circle or rotate the required time of certain angle,
τ
N+1Inherent certain the flow point (q of base table data-carrier store
n) adjacent flow point (q
N+1) time turbine rotation one circle or rotate certain angle required time.
6. according to claim 1 signal transmission and the computing method of described vortex water meter and heat energy meter is characterized in that: if:
τ
1≤τ
I-τ
I-1≤τ
0..................................(5)
In the formula: τ
1Minimum flow point (q
1) time this circle of turbine rotation or rotate the required time of certain angle,
τ
IWhen inferior this circle of measured turbine rotation or rotate the required time of certain angle,
τ
I-1Last time this circle of measured turbine rotation or rotate the required time of certain angle,
τ
0Initial-flow point (q
0) time this circle of turbine rotation or rotate the required time of certain angle,
Then revise in the following manner:
m
I＝m
1+(m
0-m
1)(τ
I-τ
1)/(τ
0-τ
1).............................(6)
In the formula: m
IThat the Fluid Volume that certain angle is surveyed out is enclosed or rotated to turbine rotation one,
m
1The inherent minimum flow point of base table data-carrier store (q
1) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through,
m
0The inherent initial-flow point of base table data-carrier store (q
0) time turbine rotation one circle or rotate the actual measurement Fluid Volume that certain angle is flowed through,
τ
IThat turbine rotation one is enclosed or rotated the measured time of certain angle,
τ
1The inherent minimum flow point of base table data-carrier store (q
1) time turbine rotation one circle or rotate the required time of certain angle,
τ
0The inherent initial-flow point of base table data-carrier store (q
0) time turbine rotation one circle or rotate certain angle required time.
7. according to claim 1 signal transmission and the computing method of described vortex water meter and heat energy meter is characterized in that: finished turbine rotation one circle or rotated the Fluid Volume (m that certain angle is surveyed out
I) correction after, as long as with all turbine rotation one circle or rotate the value of certain angle through revising and add up and can draw flow through water of the present invention or other accumulation of fluid Fluid Volume (M):
M＝∑m
I.......................................................................................(7)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110283284.6A CN103017847B (en) | 2011-09-22 | 2011-09-22 | The signal transmission of vortex electronic type water meter and heat energy meter and calculating device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110283284.6A CN103017847B (en) | 2011-09-22 | 2011-09-22 | The signal transmission of vortex electronic type water meter and heat energy meter and calculating device and method |
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| Publication Number | Publication Date |
|---|---|
| CN103017847A true CN103017847A (en) | 2013-04-03 |
| CN103017847B CN103017847B (en) | 2016-07-20 |
Family
ID=47966715
Family Applications (1)
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|---|---|---|---|
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| CN107314793A (en) * | 2017-06-19 | 2017-11-03 | 南京水门电子有限公司 | Detachable and combination type large-diameter water meter |
| CN112729486A (en) * | 2020-12-29 | 2021-04-30 | 杭州山科智能科技股份有限公司 | Intelligent water meter measuring method with self-calibration function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314793A (en) * | 2017-06-19 | 2017-11-03 | 南京水门电子有限公司 | Detachable and combination type large-diameter water meter |
| CN107314793B (en) * | 2017-06-19 | 2023-08-29 | 南京水门电子有限公司 | Detachable parallel combined large-caliber water meter |
| CN112729486A (en) * | 2020-12-29 | 2021-04-30 | 杭州山科智能科技股份有限公司 | Intelligent water meter measuring method with self-calibration function |
| CN112729486B (en) * | 2020-12-29 | 2023-08-08 | 杭州山科智能科技股份有限公司 | Intelligent water meter measuring method with self-calibration function |
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| CN103017847B (en) | 2016-07-20 |
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Denomination of invention: Signal transmission and calculation device and method of vortex electronic water meter and heat meter Effective date of registration: 20220118 Granted publication date: 20160720 Pledgee: Agricultural Bank of China Limited Changde branch Pledgor: HUNAN CHANGDE WATER METER MANUFACTURE Co.,Ltd. Registration number: Y2022980000559 |