CN203704987U - Differential pressure type flow measuring system - Google Patents
Differential pressure type flow measuring system Download PDFInfo
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- CN203704987U CN203704987U CN201420107801.3U CN201420107801U CN203704987U CN 203704987 U CN203704987 U CN 203704987U CN 201420107801 U CN201420107801 U CN 201420107801U CN 203704987 U CN203704987 U CN 203704987U
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- differential pressure
- pressure
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- pressure transmitter
- shaped pipe
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Abstract
The utility model discloses a differential pressure type flow measuring system, which comprises a throttling element, pressure measuring pipelines, a differential pressure transmitter, a flow totalizer, a pressure transmitter and a thermal resistance, wherein the differential pressure transmitter is connected onto the throttling element arranged in a fluid pipeline through positive and negative pressure measuring pipelines, the pressure transmitter and the thermal resistance are arranged on the fluid pipeline and are respectively connected with the flow totalizer, and the flow totalizer comprises a microprocessor, a channel switch, an analog-to-digital (AD) convertor, a Hart adapter, an input key, a display screen and a communication circuit. Because the Hart adapter is arranged in the flow totalizer, the flow totalizer simulates 4-20mA simulation and transports Hart digital communication signals at the same time with the differential pressure transmitter, and replaces an independent Hart manual controller. The differential pressure type flow measuring system can set parameters for the differential pressure transmitter, and can adjust measurement range of the differential pressure transmitter and the flow totalizer according to flow size, thereby solving the problem that the flow is smaller than 30% or exceeds the measurement range, and achieving full range precision.
Description
Technical field
The utility model relates to a kind of flow measurement device, specifically a kind of differential pressure system for flow measurement.
Background technology
Flow measurement industry national Specification: the applicable throughput ratio of restriction device is namely maximum flow of 30%(: minimum flow=3:1), here because differential pressure and flow square proportional, throughput ratio is lower than 30% time, and precision just can not guarantee; In addition, flow is lower than 30% time, and Reynolds number is often lower than boundary Reynolds number, and flow coefficient C is not constant, causes flow measurement inaccurate.Flow is lower than 30% time, the one, can use other type flow meter instead, but invest larger, the 2nd, in the time that Reynolds number is enough large, can, through calculating, solve by the range of manual setting differential pressure transmitter and flow integrator, but the real-time of manual setting be poor, and in the large application scenario of flow rate fluctuation, the workload of often adjusting is large.
In current Flow Measuring System, between flow integrator and differential pressure transmitter, be two-wire system 4～20mA analog transmission, nil communication between the two, both parameter settings are separately carried out.Differential pressure transmitter is the intelligent transducer with Hart agreement, exports corresponding electric current according to the differential pressure detecting, and the parameters such as its range, unit, output characteristics, small-signal excision are undertaken by 375 or 475 serial Hart manual operators.Flow integrator calculates flow according to the output current of differential pressure transmitter and the pressure detecting, temperature through flow rate calculation formula.
In prior art, the function of flow integrator from strength to strength, there is the multi-faceted compensation such as efflux coefficient, inflatable coefficient, fluid density, even network communication function of integrated serial communication, external integrated Hart agreement, but do not set up digital communication with differential pressure transmitter so far, cannot replace Hart manual operator and transmitter is carried out to parameter setting.In addition, existing Flow Measuring System also cannot effectively be processed the excessive problem of range ratio under differential pressure type flow measurement, does not realize the automatic expansion of range or dwindles.
Summary of the invention
For above-mentioned deficiency, the utility model provides a kind of differential pressure system for flow measurement, flow integrator and differential pressure transmitter adopt Hart communication, not only can carry out the parameter setting of differential pressure transmitter, and can adjust the range of differential pressure transmitter range and flow integrator.
The technical scheme in the invention for solving the technical problem is: a kind of differential pressure system for flow measurement, comprise throttling element, pressure pipeline, differential pressure transmitter and flow integrator, described differential pressure transmitter is connected on the throttling element being arranged in fluid line by symmetrically arranged positive and negative pressure pressure pipeline, it is characterized in that: also comprise pressure unit and thermal resistance, described pressure unit is arranged on fluid line and respectively and is connected with flow integrator with thermal resistance; Described flow integrator comprises microprocessor, channel switch, AD converter, Hart adapter, input key, display screen and communicating circuit, the input end of described channel switch is connected with differential pressure transmitter, pressure unit and thermal resistance respectively, output terminal is connected with microprocessor by AD converter, described Hart adapter is connected with Hart interface and the microprocessor of differential pressure transmitter respectively, and described microprocessor is connected with input key, display screen and communicating circuit respectively.Flow integrator and differential pressure transmitter carry out Hart digital communication, can check and arrange the flow measurement parameters such as the range, range unit, output characteristics, damping time, small-signal excision of differential pressure transmitter.
Preferably, during for flow measurement of steam, positive and negative pressure pressure pipeline described in the utility model comprises pressure guiding pipe and injects the U-shaped pipe of silicone oil, one end of described U-shaped pipe is connected on throttling element by pressure guiding pipe, the other end is connected to differential pressure transmitter by pressure guiding pipe, and the pressure guiding pipe at described connection U-shaped pipe two ends is horizontally disposed with; Pressure guiding pipe between described U-shaped pipe and throttling element is provided with valve one time, and one end of described U-shaped pipe is provided with pouring orifice near port, and described pouring orifice is provided with gland bonnet.
Preferably, described U-shaped pipe and pressure guiding pipe are weldless steel tube, and U-shaped pipe and pressure guiding pipe seamless link.
Preferably, the U-shaped pipe on described positive and negative pressure pressure pipeline and pressure guiding pipe are one and bend the weldless steel tube forming.
Good effect of the present utility model is: due to the built-in Hart adapter of flow integrator, and between differential pressure transmitter, carry out 4～20mA simulation and the transmission of Hart digital communication signal simultaneously, replace independently Hart manual manipulation device completely, the utility model not only can carry out parameter setting to differential pressure transmitter, and can adjust according to uninterrupted the range of differential pressure transmitter range and flow integrator, solve flow and be less than 30% or the situation of outrange, realized gamut accurate.
In addition, during for flow measurement of steam, the utility model by arranging U-shaped pipe in pressure pipeline, this U-shaped pipe and pressure guiding pipe can be adopted as a weldless steel tube and bend and form, reach the condensation isolation object to steam by inject silicone oil in U-shaped pipe, the pressure pipeline that efficiently solves traditional flow measurement of steam device is long, need to install cooling tank, need insulation companion heat, condensed fluid easily runs off, transmitter takes normal debugging, pipeline and transmitter are easily freezing, the defects such as maintenance workload is large, realize the long-term stability operation of steam flow measurement facility, reduce workload, reduce labour intensity, save tracing thermal-insulating cost.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the theory diagram of flow integrator described in the utility model;
Fig. 3 be the utility model during for flow measurement of steam described in the connection diagram of differential pressure transmitter and throttling element;
Fig. 4 be the utility model during for flow measurement of steam described in the structural representation of U-shaped pipe;
In figure, 1 throttling element, 2 pressure pipelines, 3 differential pressure transmitters, 4 flow integrators, 5 pressure units, 6 thermal resistances, 7 fluid lines, 8 pressure guiding pipes, 9 U-shaped pipes, 91 pouring orifices, 92 silicone oil, 93 gland bonnets, No. 10 valves.
Embodiment
As depicted in figs. 1 and 2, a kind of differential pressure system for flow measurement of the present utility model, comprise throttling element 1, pressure pipeline 2, differential pressure transmitter 3, flow integrator 4, pressure unit 5 and thermal resistance 6, described differential pressure transmitter 3 is connected on the throttling element 1 being arranged in fluid line 7 by symmetrically arranged positive and negative pressure pressure pipeline 2, and described pressure unit 5 is arranged on fluid line 7 and respectively and is connected with flow integrator 4 with thermal resistance 6; Described flow integrator 4 comprises microprocessor, channel switch, AD converter, Hart adapter, input key, display screen and communicating circuit, the input end of described channel switch is connected with differential pressure transmitter 3, pressure unit 5 and thermal resistance 6 respectively, output terminal is connected with microprocessor by AD converter, described Hart adapter is connected with Hart interface and the microprocessor of differential pressure transmitter 3 respectively, and described microprocessor is connected with input key, display screen and communicating circuit respectively.In Fig. 1 and Fig. 3, pressure position and pressure pipeline direction are that principle schematic represents, when practical application, need determine according to the fluid media (medium) that will measure.
Due to the built-in Hart protocol MODEM of flow integrator integrated chip, and between differential pressure transmitter, carry out 4～20mA simulation and the transmission of Hart digital communication signal simultaneously, replace independently Hart manual manipulation device completely, the range of differential pressure transmitter not only can be checked and arrange to the utility model on flow integrator, range unit, output characteristics, damping time, small-signal excision, zeroing waits flow measurement parameter, and can adjust according to uninterrupted the range of differential pressure transmitter range and flow integrator, solve flow and be less than 30% or the situation of outrange, realize gamut accurate.
Flow integrator of the present utility model can be adjusted according to uninterrupted the range of differential pressure transmitter range and flow integrator, the regulation rule following (range when acquiescence range is flowmeter design) of the range of differential pressure transmitter range and flow integrator:
1/3 and present range that flow is less than present range equal to give tacit consent to range, dwindle present range to the half of giving tacit consent to range;
flow exceeds present range and present range is less than acquiescence range, expands present range to giving tacit consent to range;
flow exceed present range and now range equal to give tacit consent to range, expand present range to giving tacit consent to 1.5 times of range;
1/3 and present range that flow is less than present range are greater than acquiescence range, dwindle present range to the half of giving tacit consent to range.
As further scheme of the present utility model, as shown in Figure 3 and Figure 4, during for flow measurement of steam, positive and negative pressure pressure pipeline 2 described in the utility model comprises pressure guiding pipe 8 and injects the U-shaped pipe 9 of silicone oil, one end of described U-shaped pipe 8 is connected on throttling element 1 by pressure guiding pipe 8, the other end is connected to differential pressure transmitter 3 by pressure guiding pipe 8, and the pressure guiding pipe at described connection U-shaped pipe two ends is horizontally disposed with; Described U-shaped pipe 9 and pressure guiding pipe 8 adopt a weldless steel tube to bend and form, pressure guiding pipe between U-shaped pipe 9 and throttling element 1 is provided with valve 10 one time, one end of described U-shaped pipe 9 is provided with pouring orifice 91 near port, to inject silicone oil 92 in U-shaped pipe, described pouring orifice 91 is provided with gland bonnet 93.
During for flow measurement of steam, the pressure guiding pipe of U-shaped pipe described in the utility model both sides need to keep level, it is symmetrical that positive/negative-pressure pipeline keeps, and pressure pipeline is short as far as possible, when installation after a valve closing, in U-shaped pipe, inject silicone oil from pouring orifice, while normally work, silicone oil plays buffer action, prevents that steam from damaging transmitter.Silicone oil is made condensation spacer pad and is had a clear superiority in compared with water, it is colourless, tasteless, nontoxic, not volatile, there is excellent resistant of high or low temperature, can at-50 ℃～+ 200 ℃, use for a long time, when steam is normally carried, the radiations heat energy of jet chimney is enough to guarantee the normal work of differential pressure transmitter and pressure pipeline, anhydrous in pressure pipeline while stopping vapour, winter can freezing pressure pipeline and differential pressure transmitter yet, has solved the pipeline instrument insulation problem of headache.The utility model adopts silicone oil to make spacer pad, not volatile, and because the pressure pipeline of U-bend both sides is levels, silicone oil can not flow in jet chimney, and the amount of long-play silicone oil can not change like this, is conducive to keep measuring accuracy.
Tradition drainer steam flow measurement device is because drainer outlet is in drainer bottom, if differential pressure transmitter is below drainer, maintainer, in the time of the blowdown of differential pressure transmitter end, is easy to just the water in drainer be drained, so just need water filling again, adjust liquid level equilibrium; And pressure pipeline described in the utility model adopts the U-shaped pipe that injects silicone oil as condensation spacer assembly, as long as close valve one time, how blowdown can not cause silicone oil to run off.
The above is preferred implementation of the present utility model; for those skilled in the art; not departing under the prerequisite of the utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection domain of the present utility model.
Claims (4)
1. a differential pressure system for flow measurement, comprise throttling element, pressure pipeline, differential pressure transmitter and flow integrator, described differential pressure transmitter is connected on the throttling element being arranged in fluid line by symmetrically arranged positive and negative pressure pressure pipeline, it is characterized in that: also comprise pressure unit and thermal resistance, described pressure unit is arranged on fluid line and respectively and is connected with flow integrator with thermal resistance; Described flow integrator comprises microprocessor, channel switch, AD converter, Hart adapter, input key, display screen and communicating circuit, the input end of described channel switch is connected with differential pressure transmitter, pressure unit and thermal resistance respectively, output terminal is connected with microprocessor by AD converter, described Hart adapter is connected with Hart interface and the microprocessor of differential pressure transmitter respectively, and described microprocessor is connected with input key, display screen and communicating circuit respectively.
2. a kind of differential pressure system for flow measurement according to claim 1, it is characterized in that: described positive and negative pressure pressure pipeline comprises pressure guiding pipe and injects the U-shaped pipe of silicone oil, one end of described U-shaped pipe is connected on throttling element by pressure guiding pipe, the other end is connected to differential pressure transmitter by pressure guiding pipe, and the pressure guiding pipe at described connection U-shaped pipe two ends is horizontally disposed with; Pressure guiding pipe between described U-shaped pipe and throttling element is provided with valve one time, and one end of described U-shaped pipe is provided with pouring orifice near port, and described pouring orifice is provided with gland bonnet.
3. a kind of differential pressure system for flow measurement according to claim 2, is characterized in that: described U-shaped pipe and pressure guiding pipe are weldless steel tube, and U-shaped pipe and pressure guiding pipe seamless link.
4. a kind of differential pressure system for flow measurement according to claim 2, is characterized in that: the U-shaped pipe on described positive and negative pressure pressure pipeline and pressure guiding pipe are one and bend the weldless steel tube forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420107801.3U CN203704987U (en) | 2014-03-11 | 2014-03-11 | Differential pressure type flow measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420107801.3U CN203704987U (en) | 2014-03-11 | 2014-03-11 | Differential pressure type flow measuring system |
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| Publication Number | Publication Date |
|---|---|
| CN203704987U true CN203704987U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420107801.3U Expired - Fee Related CN203704987U (en) | 2014-03-11 | 2014-03-11 | Differential pressure type flow measuring system |
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| CN (1) | CN203704987U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808377A (en) * | 2014-03-11 | 2014-05-21 | 济钢集团有限公司 | Differential pressure type flow measuring system |
| CN108645459A (en) * | 2018-07-04 | 2018-10-12 | 东莞市益安人防工程有限公司 | A kind of apparatus for measuring air quantity |
| CN111351533A (en) * | 2020-04-21 | 2020-06-30 | 中国舰船研究设计中心 | Marine steam flow measuring device and method |
| CN112697213A (en) * | 2020-11-14 | 2021-04-23 | 中国石油天然气股份有限公司 | Differential pressure type flowmeter, filling system and method for measuring micro-flow U-shaped pipe |
-
2014
- 2014-03-11 CN CN201420107801.3U patent/CN203704987U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808377A (en) * | 2014-03-11 | 2014-05-21 | 济钢集团有限公司 | Differential pressure type flow measuring system |
| CN103808377B (en) * | 2014-03-11 | 2017-02-01 | 济钢集团有限公司 | Differential pressure type flow measuring system |
| CN108645459A (en) * | 2018-07-04 | 2018-10-12 | 东莞市益安人防工程有限公司 | A kind of apparatus for measuring air quantity |
| CN111351533A (en) * | 2020-04-21 | 2020-06-30 | 中国舰船研究设计中心 | Marine steam flow measuring device and method |
| CN112697213A (en) * | 2020-11-14 | 2021-04-23 | 中国石油天然气股份有限公司 | Differential pressure type flowmeter, filling system and method for measuring micro-flow U-shaped pipe |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20170311 |
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| CF01 | Termination of patent right due to non-payment of annual fee |