CN103900738A - Calorimeter suitable for detection of double-time measuring method - Google Patents
Calorimeter suitable for detection of double-time measuring method Download PDFInfo
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- CN103900738A CN103900738A CN201410030777.2A CN201410030777A CN103900738A CN 103900738 A CN103900738 A CN 103900738A CN 201410030777 A CN201410030777 A CN 201410030777A CN 103900738 A CN103900738 A CN 103900738A
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- 230000002411 adverse Effects 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000000691 measurement method Methods 0.000 claims description 9
- 230000001702 transmitter Effects 0.000 claims description 4
- 238000000034 methods Methods 0.000 abstract description 7
- 238000004891 communication Methods 0.000 abstract description 6
- 238000005516 engineering processes Methods 0.000 abstract description 6
- 230000001360 synchronised Effects 0.000 abstract description 6
- 230000004907 flux Effects 0.000 description 10
- 239000011901 water Substances 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagrams Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 238000006011 modification reactions Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 280000063503 Clamper companies 0.000 description 1
- 280000255884 Dispatching companies 0.000 description 1
- 230000000996 additive Effects 0.000 description 1
- 239000000654 additives Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000000919 ceramics Substances 0.000 description 1
- 238000006243 chemical reactions Methods 0.000 description 1
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- 238000004904 shortening Methods 0.000 description 1
- 230000000087 stabilizing Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Abstract
Description
Technical field
The present invention relates to the flow measurement field of calorimeter/flowmeter, be specifically related to a kind of calorimeter/flowmeter and be applicable to the detection method of dual-time method.
Background technology
When calorimeter (general designation instrument) metering detects, detected instrument is installed in flow standard device or heat standard set-up (general designation standard set-up).According to metrology theory,, compare with the displayed value of detected instrument as standard value with the displayed value of standard set-up, to determine error and the meter characteristic thereof of detected instrument.This detection technique conventionally requires the displayed value of detected instrument (or to represent the output signal of its displayed value, as pulse signal, current signal and digital signal) and the displayed value of standard set-up within the identical time, obtain, be to think that in theory both are synchronous, the computing formula of its Error of flowrate computation is shown in formula (1), and the computing formula of heat metering error is shown in formula (2).
In formula, E 1for Error of flowrate computation, V 1and V 2be respectively the integrated flux (can be volumetric flow rate, can be also mass rate) that standard set-up and detected instrument record within the identical time, E 2for heat metering error, Q 1and Q 2be respectively the accumulation heat that standard set-up and detected instrument record within the identical time.
But in order to realize synchronous or near-synchronous, need calorimeter to have the output of pulse signal of high response, or ignore the asynchronous additive error of bringing by extending detection time.A lot of calorimeters often do not possess the output of pulse signal of high response, wish by shortening detection time to raise the efficiency simultaneously, are difficult to adapt to so this detection technique based on synchronous measurement seems.
In small-bore calorimeter testing process, mostly adopt at present start-stop method to be similar to the sampled signal starting and ending time consistency that ensures final tested table and standard instruments.And in device use procedure more than bore is greater than DN100, under the impact of the factor such as high pressure and impact of water hammer, cannot long-term security carry out the testing process of hotlist by start and stop method.
To sum up state the research that my associating Zhejiang Province Measure Science & Technology Research Institute of company of reason carries out " the asynchronous metering detection method of the flowmeter based on communication and calorimeter and system thereof " and is applicable to the calorimeter of the method.
The step of the flow of double-time measurement method (i.e. " the asynchronous metering detection method of the flowmeter based on communication and calorimeter and system thereof ") detection calorimeter is as follows:
Step 1: adjust flux device make through the stability of flow of tested calorimeter in desired value;
Step 2: at standard time t sinside record standard integrated flux V s;
Step 3: send metering detection to flowmeter and start request, read one group as initial integrated flux V 1with time value t 1;
Step 4: send metering to flowmeter and detect ending request, and read one group as the integrated flux V stopping 2with time value t 2;
Step 5: pass through V s/ t s(V 2-V 1)/(t 2-t 1) deviometer of two instantaneous deliveries calculates the flow error of detected calorimeter;
Step 6: tested calorimeter is according to staying flow error to carry out parameter correction and whether again demarcate validation error up to standard.
Dual-time method flow detection platform schematic diagram as described in Figure 3;
Summary of the invention
Be applicable to the calorimeter that double-time measurement method detects, this flowmeter detects the defect existing for synchronous measurement, under communication modes, introduces the measurement of time parameter, adopts modification method to realize the technology that asynchronous metering detects.
The present invention adopts following technology to implement for achieving the above object:
Be applicable to the calorimeter that double-time measurement method detects, it is characterized in that: comprise a body, in body, be provided with flow measurement assembly and/or temperature survey assembly; In the upstream tube of body, be provided with following current transducer, in the downstream tube of body, be provided with adverse current transducer; This calorimeter also comprises Control Component and signal transmission component, and control module control flow measurement assembly and/or temperature survey assembly carry out input and the signal that flow measurement assembly and/or temperature survey assembly record is carried out to analyzing and processing; Between the signal timing of flow measurement assembly and/or the collection of temperature survey assembly, the storage element that exports at interval stores; The signal is far passed unit carries out telecommunication by the signal of storage unit with the time signal that is accurate to second and uploads.This calorimeter detects the defect existing for synchronous measurement, under communication modes, introduce the measurement of time parameter, adopts modification method to realize the technology that asynchronous metering detects.
Concrete scheme is:
Following current transducer and adverse current transducer are respectively ultrasonic transducer.
Constant duration carries out data storage.
The signal that signal transmitter unit is uploaded also comprises the time signal that is accurate to 1 second.
The principle of operation that adopts the above-mentioned calorimeter that is applicable to the detection of double-time measurement method to detect is as follows:
Through calorimeter following current transducer and adverse current transducer to hot water flow from transmitting, sample and calculate per second carrying out four times, calculating averages after flow is added in the integrated flux variable of tested table as the integrated flux of p.s.;
Integrated flux adopts the interval storage of fixing time, and the time interval of storage data is 1 second, and error is no more than positive and negative 1 millisecond;
In detection and teletransmission communication process, when uploading integrated flux, accumulation heat, upload an internal time, the time includes year, month, day, hour, min, second.
Brief description of the drawings
Fig. 1 is flow detection principle schematic of the present invention.
Fig. 2 is data calculating of the present invention, storage and teletransmission schematic diagram.
Fig. 3 is dual-time method flow detection platform schematic diagram of the present invention;
1-frequency conversion voltage stabilizing water pump water supply system, (domestic pump. import frequency converter. power kw. output 0-600M 3/ h is adjustable; 2-4M 3volume buffer tank; 3-stop valve DN200; 4-ABB DN200 electromagnetic flowmeter (0.25 grade of 30-600M 3/ h; 5-electric control valve DN200; 6-pneumatic on-off valve DN200; 7-ABB DN100 electromagnetic flowmeter (0.25 grade of 8-160M 3/ h; 8-electric control valve DN100; 9-pneumatic on-off valve DN100; 10-ABB DN50 electromagnetic flowmeter (0.25 grade of 1-10M 3/ h; 11-electric control valve DN50; 12-pneumatic on-off valve DN50; 13-stop valve DN200; 14-tank; The tested table of 15-; 16-Water Tank with Temp.-controlled; 17-air clamper DN200; 18-DN25 suction pump; 19-non-return valve DN25; 20-pneumatic on-off valve DN200; The pneumatic commutator DN200 of 21-; 22-30M 3water tank; 23-Imported Electronic claims 0-5T; 24-pneumatic on-off valve DN100; 25-switch board; 26-shows mirror thoroughly; 27-heater strip system 15kwX10;
Embodiment
Detect the step of the flow of calorimeter according to dual-time method and formulate concrete embodiment:
1, the sampling of flow and calculating
The external dimensional requirement of the mechanical mechanism of sampling national standard; Following current transducer and adverse current transducer that the traffic sampling part of calorimeter adopts are ultrasonic transducer; Ultrasonic calorimeter is to add temperature-measuring module on the basis of ultrasonic flow meter, the heat providing to user is provided for flow and confession, backwater temperature difference by fluid, wherein flow measurement part is that a pair of ultrasonic transducer of application is is alternately received and dispatched ultrasound wave mutually, indirectly measure the flow velocity of fluid by the co-current flow and counter-current flow propagation time difference of observation ultrasound wave in medium, then carry out calculated flow rate by flow velocity.
2, the storage of data
Constant duration (1 second) carries out data storage.
What our company's ultrasonic calorimeter used is MSP430 series low-power scm, keep low-power consumption and high-precision requirement for adapting to long-term use, employing twin crystal shakes: on the basis of 32768Hz, be furnished with the ceramic crystal oscillator of the start and stop rapidly of 4MHz, in the time of sampling, moment opens.
Often open entering single-chip microcomputer 4M crystal oscillator under calibrating state, 200ms once samples, and calculates one time instantaneous delivery, and each flow value calculating is put into a buffer memory, etc. the data of next 200ms to be superimposed, cumulative draw data on flows per second after then the data in buffer memory are average continuous four times; Temperature approach of collection per second simultaneously, draws through integral and calculating the calorie value that produce p.s..
After the sampling calculating of p.s. finishes, adopt the mode that timing is interrupted to carry out data storage.Single-chip microcomputer adopts 32768Hz crystal oscillator as reference clock, and the single step time is 30.518 delicate (1/32768=0.000030518s), and the deviation in 1 second time interval of same hotlist is below ten thousand/second.
3, the transmission of signal
The signal that signal transmitter unit is uploaded also comprises the time signal that is accurate to 1 second.
Master routine operates under basic crystal oscillator 32768Hz state, with fixing per second to address 0x01+0x1f0x90 stack and refresh data in single-chip microcomputer of the mode of interrupting, accomplish hotlist by infrared or M-BUS externally in the information of output data consistent with the height of time:
000000.000500.0000000500000000170000000035000000002C
The current heat thermal power of clearing heat flux cumulating flow
580301???010001?470000???04072302061220???0000
Supply water temperature return water temperature accumulated operating time ss-mm-hh-dd-yy-yy (time) state
Note: wherein 05,17,35,2C, the representation unit such as 01,00 is numerical value and time
The present invention is on the basis of conventional hotlist, and the performance parameter of the MCU using in view of existing batch is carried out technical finesse on flow rate calculation and time data memory node, completes the accurately calibrating of dispatching from the factory of calorimeter.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
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| EP1170575A2 (en) * | 2000-07-04 | 2002-01-09 | Siemens Building Technologies AG | Liquid flowmeter ,like watermeter,and heat meter |
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| CN101581596A (en) * | 2009-06-05 | 2009-11-18 | 浙江省计量科学研究院 | Flow detecting method based on double-time measurement technology and apparatus thereof |
| CN201672996U (en) * | 2010-05-05 | 2010-12-15 | 左晔 | Ultrasonic heat meter |
| CN102252785A (en) * | 2011-06-10 | 2011-11-23 | 吴兴中 | Ultrasonic heat and cold meter through time difference process and metering method thereof |
| CN202057434U (en) * | 2011-05-12 | 2011-11-30 | 铜陵德瑞曼电子科技有限公司 | Ultrasonic base tube for heat meter |
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| CN102889915A (en) * | 2012-07-26 | 2013-01-23 | 浙江省计量科学研究院 | Flowmeter and calorimeter asynchronous metering and detecting method and flowmeter and calorimeter asynchronous metering and detecting system based on communication |
| CN203259272U (en) * | 2013-03-28 | 2013-10-30 | 乌鲁木齐新睿科技有限责任公司 | Calorimeter with sound velocity real-time calibration function |
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2014
- 2014-01-18 CN CN201410030777.2A patent/CN103900738A/en not_active Application Discontinuation
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1170575A2 (en) * | 2000-07-04 | 2002-01-09 | Siemens Building Technologies AG | Liquid flowmeter ,like watermeter,and heat meter |
| CN101004353A (en) * | 2007-01-16 | 2007-07-25 | 中国计量学院 | Detection method of time difference cross in use for ultrasonic flowmeter |
| CN101581596A (en) * | 2009-06-05 | 2009-11-18 | 浙江省计量科学研究院 | Flow detecting method based on double-time measurement technology and apparatus thereof |
| CN201672996U (en) * | 2010-05-05 | 2010-12-15 | 左晔 | Ultrasonic heat meter |
| CN202057434U (en) * | 2011-05-12 | 2011-11-30 | 铜陵德瑞曼电子科技有限公司 | Ultrasonic base tube for heat meter |
| CN102252785A (en) * | 2011-06-10 | 2011-11-23 | 吴兴中 | Ultrasonic heat and cold meter through time difference process and metering method thereof |
| CN102889915A (en) * | 2012-07-26 | 2013-01-23 | 浙江省计量科学研究院 | Flowmeter and calorimeter asynchronous metering and detecting method and flowmeter and calorimeter asynchronous metering and detecting system based on communication |
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