CN104344875B - A kind of pulse timing counting device and method for fluid flow calibrating - Google Patents
A kind of pulse timing counting device and method for fluid flow calibrating Download PDFInfo
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- CN104344875B CN104344875B CN201410637208.4A CN201410637208A CN104344875B CN 104344875 B CN104344875 B CN 104344875B CN 201410637208 A CN201410637208 A CN 201410637208A CN 104344875 B CN104344875 B CN 104344875B
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Abstract
The present invention provides a kind of pulse timing counting device and method for fluid flow calibrating, and it sets pulse timing counting device above the flowmeter of fluid flow device；Pulse timing counting device includes master controller, and master controller coordinates external module work, and external module includes timing counting module, communication module, keyboard input module, level triggers module, display module, output module.Commutator commutates, current direction is set to weigh in water tank, washer on commutator can block optoelectronic switch and produce trigger signal, trigger signal is transmitted to pulse timing counting device, start timing with counting, when the water in water tank of weighing reaches predetermined quality, commutator commutation stops timing with counting, and records the quality weighed, time and umber of pulse.By using the present invention relates to pulse timing counting device and method, it is possible to achieve flow calibrating device timing, count synchronization；It can detect that the commutating period that commutator commutates every time is poor simultaneously.
Description
Technical field
The invention belongs to fluid flow or volume measurement technical field, and in particular to a kind of arteries and veins for fluid flow calibrating
Rush time-counting device and method.
Background technology
Flow measurement is that measuring science most wants the part to be widely applied in each field.Flow standard device is made
For a kind of standard set-up of flow instrument transmission, based on the fluid flow device of Static mass method.
《The fluid flow device vertification regulations of JJG164-2000》In define two methods commutator examined and determine,
Progressive error method and flowmeter method.Progressive error method is the time for swapping out and changing to by measuring commutator respectively, and they are calculated
Standard deviation and time difference for swapping out and changing to, and then calculate the uncertainty of commutator.This method is relatively simple, real
Apply conveniently, be widely used, but in verification process, because timer and timer are two independent equipment, theirs is same
Step property is difficult to ensure that.
The content of the invention
It is an object of the invention to provide a kind of pulse timing counting device and method for fluid flow calibrating, it can
The umber of pulse sent with synchro measure flowmeter and the time of calibrating, and it is measurable go out standard water flow device in commutator
Commutating period is poor.
Realize the technical scheme of the object of the invention：A kind of pulse timing counting device for fluid flow calibrating, the dress
Put and be used for fluid flow device, it sets pulse timing counting device above the flowmeter of fluid flow device；
Described fluid flow device includes cyclic water tank, and cyclic water tank connects water pump by pipeline；Water pump passes through pipeline
Vacuum tank is connected, vacuum tank is arranged on the water outlet above commutator by pipeline connection by pipeline connection flow gauge, flowmeter
Pipe；Electronic scale is set above cyclic water tank, water tank of weighing is placed on electronic scale, is cyclic water tank entrance beside water tank of weighing；
Commutator is arranged on weigh water tank and cyclic water tank entrance top, and outlet pipe is arranged on above commutator；The outlet pipe side band
There is washer, the commutator of corresponding opening position is provided with optoelectronic switch；Commutator bottom is provided with delivery port, passes through commutator position
Put conversion so that outlet pipe outflow water its only flow into cyclic water tank entrance or only flow into water tank of weighing；
Described pulse timing counting device includes master controller, and master controller coordinates external module work, external module
Including timing counting module, communication module, keyboard input module, level triggers module, display module, output module；Wherein, count
When counting module pulse signal caused by flowmeter is counted, and according to the trigger signal of level triggers module to pulsimeter
Number function is enabled；Timing, tally function use the same processor in the module to complete, and ensure the synchronization of time reference；
In timing, counting process, the umber of pulse meeting real-time display of record is in display module；Keyboard input module has one group and pressed
Key, by operative combination button, the content shown with reference to display screen, timing can be counted and be zeroed out, messaging parameter is set；
Communication module has RS485 interfaces, by modbus485 agreements, reads umber of pulse.
A kind of pulse timing counting device for fluid flow calibrating as described above, it connects in cyclic water tank and water pump
The pipeline connect is provided with pump intake valve；Pump discharge valve is provided with water pump and the tank connected pipeline of voltage stabilizing；In vacuum tank and flow
The pipeline of meter connection is provided with flowmeter inlet valve；Regulating valve is provided with the pipeline that flowmeter is connected with outlet pipe.
A kind of pulse timing method of counting for fluid flow calibrating of the present invention, it first fills cyclic water tank
More than 80% water, remove the peel after water tank unwatering of weighing, commutator makes flow direction cyclic water tank, open respectively pump intake valve,
Pump discharge valve, flowmeter inlet valve, by water pump and regulating valve, after regulation flow reaches certified value, commutator commutation, make current
Into water tank of weighing, the washer on commutator can block optoelectronic switch and produce trigger signal, and trigger signal is transmitted to pulse timing meter
Counting apparatus, start timing with counting, when the water in water tank of weighing reaches predetermined quality, commutator commutation stops timing and meter
Number, records the quality weighed, timing time and umber of pulse N, and the instrument coefficient of flow meter and not true is calculated according to vertification regulation
Fixed degree；The counting mode of pulse timing counting device has two kinds, and one kind is pulse-triggered pattern, and one kind is long signal trigger mode
Formula, may be implemented in verification process record commutating period it is poor, flowmeter use process record flowmeter integrated flow.
A kind of pulse timing method of counting for fluid flow calibrating as described above, the pulse-triggered mould described in it
Formula, when it is high level to start control input in level triggers module, this function is enabled, when gating pulse one is optoelectronic switch
Caused signal, first rising edge caused by optoelectronic switch, timer, counter O reset, and timer, counter are made
Can, the umber of pulse that timing counting module start recording receives, when optoelectronic switch produces second rising edge, stop counting,
In the process, while the time t1 of first pulse, the time between first rising edge and second rising edge can be recorded
T2, the time t3 between first rising edge and second trailing edge；Wherein t1 for change the time, t2 for calibrating the time, t3 with
T2 difference is to swap out the time；Commutating period difference △ t=in verification process | t3-t2-t1 |；
Described long signal trigger mode formula, when the input of gating pulse two receives rising edge in level triggers module, meter
When device, counter do not reset, and timer, counter enabled, return pulse signal input, bulk registration, gating pulse two
Input receives trailing edge and stops timing, counts, and records to be added with the cumulative time before by this time and draws cumulative time tc.
A kind of pulse timing method of counting for fluid flow calibrating as described above, its during timing counting,
The umber of pulse meeting real-time display of record, by Cao Zuoanjian input module, can transfer t1, t2, t3, tc in display module
Value is shown in display module.
A kind of pulse timing method of counting for fluid flow calibrating as described above, its during timing counting,
The umber of pulse meeting real-time display of record is in display module；Keyboard input module has one group of button, by operative combination button,
The content shown with reference to display screen, to timing count be zeroed out, set RS485 messaging parameters, can also show respectively t1, t2,
T3, tc and umber of pulse set alarm threshold value；After alarm threshold value transfinites, the alarm signal can be shown in display module,
And export digital quantity signal to output module；Communication module has RS485 interfaces, can read arteries and veins by modbus485 agreements
Number, t1, t2, t3, tc value are rushed, their alarm threshold value is may also set up, reads warning message, and be zeroed out.
Effect of the invention is that：It is synchronous with count measurement not that the present invention is directed to the time in existing standard flow apparatus
Foot, design a kind of pulse timing counting device and method for fluid flow calibrating.By using the present invention relates to
Pulse timing counting device and method, it is possible to achieve flow calibrating device timing, the synchronization counted；Commutation can be detected simultaneously
The commutating period that device commutates every time is poor, and alarm can be produced when pulse is transfinited or commutating period transfinites.
Brief description of the drawings
Fig. 1 is fluid flow schematic device；
Fig. 2 is pulse timing counting device schematic diagram；
Fig. 3 pulse-triggered pattern timing diagrams；
The long signal trigger mode formula timing diagrams of Fig. 4；
In figure：1. washer；2. optoelectronic switch；3. commutator；4. water tank of weighing；5. outlet pipe；6. electronic scale；7. pump intake
Valve；8. cyclic water tank；9. pulse timing counting device；10. water pump；11. pump discharge valve；12. vacuum tank；13. flowmeter entrance
Valve；14. flowmeter；15. regulating valve；16. cyclic water tank entrance；21. master controller；22. timing counting module；23. communicate mould
Block；24. keyboard input module；25. level triggers module；26. display module；27. output module；31. start control input；
32. gating pulse one；33. counter enabled state；41. gating pulse two；42. counter enabled state.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment to a kind of pulse timing for fluid flow calibrating of the present invention
Counting device and method are further described.
Embodiment 1
A kind of pulse timing counting device for fluid flow calibrating of the present invention, the device are used for fluid flow
Device, it sets pulse timing counting device 9 above the flowmeter 14 of fluid flow device；
As shown in figure 1, described fluid flow device includes cyclic water tank 8, cyclic water tank 8 connects water pump by pipeline
10；Water pump 10 connects vacuum tank 12 by pipeline, and by pipeline connection flow gauge 14, flowmeter 14 is connected vacuum tank 12 by pipeline
Connect the outlet pipe 5 for being arranged on the top of commutator 2；Electronic scale 6 is set above cyclic water tank 8, water tank of weighing is placed on electronic scale 6
4, the side of water tank 4 of weighing is cyclic water tank entrance 16；Commutator 3 is arranged on weigh water tank 4 and cyclic water tank entrance top, water outlet
Pipe 5 is arranged on the top of commutator 3；The side of outlet pipe 5 carries washer 1, and the commutator 3 of corresponding opening position is provided with photoelectricity
Switch 2；The bottom of commutator 3 is provided with delivery port, passes through the position of commutator 3 and changes so that the water that outlet pipe 5 flows out its only flow into and follow
Ring tank entry 16 only flows into water tank 4 of weighing；
Pump intake valve 7 is provided with the pipeline that cyclic water tank 8 is connected with water pump 10；It is connected in water pump 10 with vacuum tank 12
Pipeline is provided with pump discharge valve 11；Flowmeter inlet valve 13 is provided with the pipeline that vacuum tank 12 is connected with flowmeter 14；Flowing
The pipeline that gauge 15 is connected with outlet pipe 17 is provided with regulating valve 15.
As shown in Fig. 2 described pulse timing counting device 9 includes master controller 21, master controller 21 coordinates each outside
Module work, external module include timing counting module 22, communication module 23, keyboard input module 24, level triggers module 25,
Display module 26, output module 27；Wherein, timing counting module 22 counts to pulse signal caused by flowmeter 14, and
Enabled according to the trigger signal pulse count function of level triggers module 25；Timing, tally function are used in the module
Same processor complete, ensure the synchronization of time reference；In timing, counting process, the umber of pulse of record can real-time display
In display module 26；Keyboard input module 24 has one group of button, by operative combination button, show with reference to display screen in
Hold, timing can be counted and be zeroed out, messaging parameter is set；Communication module 23 has RS485 interfaces, passes through modbus485
Agreement, read umber of pulse.
Embodiment 2
Using the pulse timing counting side of the pulse timing counting device for being used for fluid flow calibrating described in embodiment 1
Method, its step are as follows：
Cyclic water tank 8 is filled to more than 80% water first, removed the peel after the unwatering of water tank 4 of weighing, commutator 5 makes flow direction
Cyclic water tank 8, pump intake valve 7, pump discharge valve 11, flowmeter inlet valve 13 are opened respectively, by water pump 10 and regulating valve 15, adjust
After amount of restriction reaches certified value, commutator 3 commutates, and current direction is weighed in water tank 4, the washer 1 on commutator 3 can block photoelectricity
Switch 2 produces trigger signal, and trigger signal is transmitted to pulse timing counting device 9, starts timing with counting, when in water tank 4 of weighing
Water when reaching predetermined quality, the commutation of commutator 3 stops timing and counted, record the quality weighed, timer time with
The umber of pulse N of counter, the instrument coefficient and uncertainty of flow meter are calculated according to vertification regulation；
The counting mode of pulse timing counting device has two kinds, and one kind is pulse-triggered pattern, and one kind is long signal triggering
Pattern, may be implemented in verification process record commutating period it is poor, flowmeter use process record flowmeter integrated flow.Tool
Body is as follows：
As shown in figure 3, described pulse-triggered pattern, is high level when starting control input 31 in level triggers module 25
When, this function is enabled, when the as signal caused by optoelectronic switch 2 of gating pulse 1, first rising caused by optoelectronic switch 2
Edge, timer, counter O reset, and timer, counter are enabled, the pulse that the start recording of timing counting module 22 receives
Number, when optoelectronic switch 2 produces second rising edge, stop counting, in the process, while can record first pulse when
Between t1, the time t2 between first rising edge and second rising edge, between first rising edge and second trailing edge
Time t3；Wherein t1 is the change time, and for t2 to examine and determine the time, t3 and t2 difference are to swap out the time；During commutation in verification process
Between poor △ t=| t3-t2-t1 |；
As shown in figure 4, described long signal trigger mode formula, when the input of gating pulse 2 41 receives in level triggers module 25
During to rising edge, timer, counter are not reset, and timer, counter are enabled, and return pulse signal input, add up note
Record, the input of gating pulse two receive trailing edge and stop timing, count, record and be added by this time with the cumulative time before
Go out cumulative time tc.
During timing counting, the umber of pulse meeting real-time display of record is in display module 26；Keyboard input module 24
With one group of button, by operative combination button, the content shown with reference to display screen, timing is counted and is zeroed out, sets
RS485 messaging parameters, t1, t2, t3, tc and umber of pulse can be also shown respectively or alarm threshold value is set；, should after alarm threshold value transfinites
Alarm signal 26 can be shown in display module, and export digital quantity signal to output module 27；Communication module 23 has
RS485 interfaces, it can read umber of pulse, t1, t2, t3, tc value by modbus485 agreements, may also set up they alarm
Threshold value, warning message is read, and be zeroed out.
In the present invention when the side of commutator 3 initially enters opposite side, washer 1 starts to trigger optoelectronic switch 2, works as commutator
3 completely into opposite side when, the trigger signal of optoelectronic switch 2 disappears, and is achieved in commutator 3 in commutation process so that light
Electric switch 2 produces two pulses, and the two pulses are respectively to change to the time and swap out the time.The timing of pulse timing counting device
Same crystal oscillator generation time benchmark is used with counting module, ensures timing and the synchronism counted.
Claims (4)
- A kind of 1. pulse timing method of counting of pulse timing counting device for fluid flow calibrating, it is characterised in thatThe described pulse timing counting device for being used for fluid flow calibrating, it is above the flowmeter (14) of fluid flow device Pulse timing counting device (9) is set；Described fluid flow device includes cyclic water tank (8), and cyclic water tank (8) passes through pipeline Connect water pump (10)；Water pump (10) connects vacuum tank (12) by pipeline, vacuum tank (12) by pipeline connection flow gauge (14), Flowmeter (14) is arranged on the outlet pipe (5) above commutator (2) by pipeline connection；Electricity is set above cyclic water tank (8) Sub- scale (6), water tank (4) of weighing is placed on electronic scale (6), is cyclic water tank entrance (16) beside water tank of weighing (4)；Commutator (3) water tank of weighing (4) and cyclic water tank entrance top are arranged on, outlet pipe (5) is arranged on above commutator (3)；The outlet pipe (5) side carries washer (1), and the commutator (3) of corresponding opening position is provided with optoelectronic switch (2)；Commutator (3) bottom is set Have delivery port, pass through commutator (3) position change so that outlet pipe (5) outflow water its only flow into cyclic water tank entrance (16) Or only flow into water tank of weighing (4)；Described pulse timing counting device (9) includes master controller (21), master controller (21) Coordinate each external module work, external module includes timing counting module (22), communication module (23), keyboard input module (24), level triggers module (25), display module (26), output module (27)；Wherein, timing counting module (22) is to flowmeter (14) pulse signal is counted caused by, and is carried out according to the trigger signal pulse count function of level triggers module (25) It is enabled；Timing, tally function use the same processor in the module to complete, and ensure the synchronization of time reference；In timing, count During, the umber of pulse meeting real-time display of record is in display module (26)；Keyboard input module (24) has one group of button, leads to Operative combination button is crossed, the content shown with reference to display screen, timing can be counted and be zeroed out, messaging parameter is set；Communication Module (23) has RS485 interfaces, by modbus485 agreements, reads umber of pulse；This method is specific as follows：Cyclic water tank (8) is filled to more than 80% water first, removed the peel after water tank of weighing (4) unwatering, commutator (5) makes current stream To cyclic water tank (8), pump intake valve (7), pump discharge valve (11), flowmeter inlet valve (13) are opened respectively, is passed through water pump (10) With regulating valve (15), after regulation flow reaches certified value, commutator (3) commutation, current direction is set to weigh in water tank (4), commutator (3) washer (1) on can block optoelectronic switch (2) and produce trigger signal, and trigger signal is transmitted to pulse timing counting device (9), Start timing with counting, when the water in water tank of weighing (4) reaches predetermined quality, commutator (3) commutation stops timing and meter Number, records the quality weighed, timing time and umber of pulse N, and the instrument coefficient of flow meter and not true is calculated according to vertification regulation Fixed degree；The counting mode of pulse timing counting device has two kinds, and one kind is pulse-triggered pattern, and one kind is long signal trigger mode formula, May be implemented in verification process record commutating period it is poor, flowmeter use process record flowmeter integrated flow；Described pulse-triggered pattern, when it is high level to start control input (31) in level triggers module (25), enable this Function, when gating pulse one (32) is signal caused by optoelectronic switch (2), first rising edge caused by optoelectronic switch (2), Timer, counter O reset, and timer, counter are enabled, the pulse that timing counting module (22) start recording receives Number, when optoelectronic switch (2) produces second rising edge, stop counting, in the process, while first pulse can be recorded Time t1, the time t2 between first rising edge and second rising edge, between first rising edge and second trailing edge Time t3；Wherein t1 is the change time, and for t2 to examine and determine the time, t3 and t2 difference are to swap out the time；Commutation in verification process Time difference △ t=| t3-t2-t1 |；Described long signal trigger mode formula, when gating pulse two (41) input receives rising edge in level triggers module (25) When, timer, counter are not reset, and timer, counter are enabled, and return pulse signal input, bulk registration, gate arteries and veins The input of punching two receives trailing edge and stops timing, counts, and records and is added by this time with the cumulative time before when drawing accumulative Between tc.
- 2. a kind of pulse timing of pulse timing counting device for fluid flow calibrating according to claim 1 counts Method, it is characterised in that：During timing counting, the umber of pulse meeting real-time display of record passes through in display module (26) Cao Zuoanjian input module (24), the value that can transfer t1, t2, t3, tc are shown in display module (26).
- 3. a kind of pulse timing of pulse timing counting device for fluid flow calibrating according to claim 1 counts Method, it is characterised in that：During timing counting, the umber of pulse meeting real-time display of record is in display module (26)；Button Input module (24) has one group of button, by operative combination button, the content shown with reference to display screen, timing is counted and carried out Reset, RS485 messaging parameters are set, can also show t1, t2, t3, tc and umber of pulse respectively or alarm threshold value is set；Alarm threshold value After transfiniting, the alarm signal (26) can be shown in display module, and export digital quantity signal to output module (27)；It is logical Letter module (23) has RS485 interfaces, can read umber of pulse, t1, t2, t3, tc value by modbus485 agreements, also may be used Their alarm threshold value is set, reads warning message, and is zeroed out.
- 4. a kind of pulse timing of pulse timing counting device for fluid flow calibrating according to claim 1 counts Method, it is characterised in that：Pump intake valve (7) is provided with the pipeline that cyclic water tank (8) is connected with water pump (10)；In water pump (10) The pipeline being connected with vacuum tank (12) is provided with pump discharge valve (11)；On the pipeline that vacuum tank (12) is connected with flowmeter (14) Provided with flowmeter inlet valve (13)；Regulating valve (15) is provided with the pipeline that flowmeter (15) is connected with outlet pipe (17).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1654667A1 (en) * | 1988-12-05 | 1991-06-07 | Предприятие П/Я Р-6564 | Model flowmetering rig |
| CN2251715Y (en) * | 1995-11-23 | 1997-04-09 | 宝山钢铁(集团)公司 | Hydraulic flowmeter on-line checking device |
| CN102141426A (en) * | 2010-12-07 | 2011-08-03 | 浙江省计量科学研究院 | Fluid reversing device and reversing and timing method |
| CN103248356A (en) * | 2013-05-20 | 2013-08-14 | 上海理工大学 | Counter based on phase-lock loop pulse interpolation technology and realization method |
| CN204188240U (en) * | 2014-11-05 | 2015-03-04 | 北京航天计量测试技术研究所 | A kind of pulse timing counting assembly for fluid flow calibrating |
-
2014
- 2014-11-05 CN CN201410637208.4A patent/CN104344875B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1654667A1 (en) * | 1988-12-05 | 1991-06-07 | Предприятие П/Я Р-6564 | Model flowmetering rig |
| CN2251715Y (en) * | 1995-11-23 | 1997-04-09 | 宝山钢铁(集团)公司 | Hydraulic flowmeter on-line checking device |
| CN102141426A (en) * | 2010-12-07 | 2011-08-03 | 浙江省计量科学研究院 | Fluid reversing device and reversing and timing method |
| CN103248356A (en) * | 2013-05-20 | 2013-08-14 | 上海理工大学 | Counter based on phase-lock loop pulse interpolation technology and realization method |
| CN204188240U (en) * | 2014-11-05 | 2015-03-04 | 北京航天计量测试技术研究所 | A kind of pulse timing counting assembly for fluid flow calibrating |
Non-Patent Citations (3)
| Title |
|---|
| 一种基于流量法的大型贮罐容积标定***;逯军，孙海涛，唐永欣，任闽，孙凤举，***;《宇航计测技术》;20101231;第30卷(第6期);第20-25页 * |
| 流量装置中换向器检定方法的研究;孟涛,王池,***;《计量学报》;20081130;第29卷(第5期);第420页左栏第1段及图1 * |
| 静态质量法水流量标准装置的设计与实现;陈利,刘鹏飞,郑永辉,刘仁;《自动化与仪器仪表》;20071231(第3期);第62页右栏倒数第1段-第63页右栏倒数第3段及图1 * |
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