CN102519653A - Spring tube and foil gauge combined type digital pressure gauge - Google Patents
Spring tube and foil gauge combined type digital pressure gauge Download PDFInfo
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- CN102519653A CN102519653A CN2011104219495A CN201110421949A CN102519653A CN 102519653 A CN102519653 A CN 102519653A CN 2011104219495 A CN2011104219495 A CN 2011104219495A CN 201110421949 A CN201110421949 A CN 201110421949A CN 102519653 A CN102519653 A CN 102519653A
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Abstract
The invention relates to a spring tube and foil gauge combined type digital pressure gauge mainly comprising a pressure sensor, a signal conditioning circuit, a microcomputer, an LCD liquid crystal screen, a button, a circuit board, a pressure gauge joint and a gauge shell. The pressure sensor consists of a spring tube, a full bridge circuit, two temperature compensation foil gauges, and a negative temperature coefficient thermistor, wherein the full bridge circuit is formed by two resistance foil gauges that are symmetrically pasted along an inner side axis and an outer side axis of the spring tube. The pressure sensor is connected with the signal conditioning circuit that is formed by a filtering circuit and an amplification circuit; the signal conditioning circuit is connected with the microcomputer that is connected with the LCD liquid crystal screen and the key. One end of the spring tube is sealed and the other end of the spring tube is communicated with a pressure source through the joint. According to the invention, the digital pressure gauge is suitable for fluid pressure measurement; after the temperature compensation, a temperature drift error becomes small; and additional functions of unit switching, starting-up self-checking, time-delay shutdown, and low voltage alarm can be realized; moreover, the digital pressure gauge has characteristics of circuit universality, wide measuring range scope, high precision, low power consumption, corrosion resistance, low cost and convenient zero adjustment and calibration and the like.
Description
Technical field
The present invention relates to a kind of bourdon tube digital pressure gauge based on the ess-strain principle.Be specially a kind of bourdon tube foil gauge combined type digital tensimeter.
Background technology
Along with the fast development of science and technology, the embedded Control technology has obtained using widely in the middle of all trades and professions.Particularly at instrument, instrument industry, from unifunctional analog meter instrument to digitizing, multi-functional, intelligent direction development.Traditional tensimeter is to produce elastic deformation through elastic body, amplifies through the manometric mechanical gear mechanism that passes on Gong then, and tensimeter will demonstrate with respect to atmospheric relative value.But this type tensimeter is generally relatively heavier and with being easy to fall partially with backpointer for a long time, and detects by an unaided eye and have error, makes measuring accuracy decline.Thereby mechanical instrument and meter all need be to digitizing, multi-functional, intelligent direction development.
Summary of the invention
In order to solve existing technical matters in the background technology, the present invention provides a kind of bourdon tube foil gauge combined type digital tensimeter.This digital pressure gauge duty numerical value intuitive display, easy to operate, stable, and also ratio of precision is higher, and range is big.
Technical scheme of the present invention: a kind of bourdon tube foil gauge combined type digital tensimeter, it comprises pressure transducer, signal conditioning circuit, microcomputer, LCD liquid crystal display, button, pressure tapping and watchcase; Described pressure transducer respectively pastes the full-bridge circuit that two pieces of resistance strain gages are linked to be through lead by both sides inside and outside the bourdon tube along axis symmetry; Adding two pieces of temperature compensation foil gauges constitutes jointly; Its full-bridge circuit output terminal connects signal conditioning circuit input end (being added with the thermistor of negative temperature coefficient in the signal conditioning circuit, so that pressure transducer output signal is carried out temperature compensation), and the signal conditioning circuit output terminal connects the microcomputer sample port; Button is connected with microcomputer; The microcomputer output terminal connects the LCD liquid crystal display, and bourdon tube one end is sealed into free end, and the other end has and the pressure-source communication joint.
In the technical scheme of the present invention, signal conditioning circuit comprises full-bridge circuit output signal filter circuit and signal amplification circuit, and its signal filter circuit output connects the input of signal amplification circuit.
In the technical scheme of the present invention, in the signal amplification circuit of signal conditioning circuit, be connected with of the temperature compensation of negative tempperature coefficient thermistor circuit as the output signal
In the technical scheme of the present invention, described microcomputer carries 16 or 24 figure place weighted-voltage D/A converters, or adds 16 or 24 analog to digital converters.
In the technical scheme of the present invention, described microcomputer is single-chip microcomputer, ARM or DSP.
In the technical scheme of the present invention, microcomputer is provided with realizes startup self-detection, system hibernates, delay switching-off and low-voltage alert applications software.
In the technical scheme of the present invention, described resistance strain gage adopts constantan material or semiconductor material, closely pastes and is fixed on and the bourdon tube surface, constitutes bridge diagram.
In the technical scheme of the present invention, described bourdon tube foil gauge combined type digital tensimeter power supply adopts the civil power after battery or process power module are handled.
In the technical scheme of the present invention, the chip for driving of microcomputer control LCD liquid crystal display shows, in PSI, BAR, KPA, MPA or five kinds of different pressure units of KG, carries out unit through button and switches.
Bourdon tube foil gauge combined type digital tensimeter of the present invention comprises pressure transducer, signal conditioning circuit, microcomputer and LCD liquid crystal display; Pressure transducer is gathered the signal numerical value of bourdon tube fluid pressure size in real time; And this signal is delivered to signal conditioning circuit carry out filtering and amplification; Signal conditioning circuit connects microcomputer, and microcomputer connects the LCD liquid crystal display, drives the LCD liquid crystal display and shows.
The present invention constitutes the full-bridge differential circuit with the inside and outside both sides that stick on bourdon tube of resistance strain gage symmetry; The output termination signal conditioning circuit of electric bridge when the deformation of bourdon tube pressurized, can make bourdon tube generation deformation; Thereby cause resistance strain gage deformation; The deformation of foil gauge causes the resistance value of foil gauge to change, and makes the electric bridge out of trim voltage signal to occur.Microcomputer is through detecting this voltage signal and converting thereof into corresponding physical pressure value and the brilliant demonstration of liquor charging.
Substantive distinguishing features of the present invention is mainly reflected in progressive: adopt the combination of bourdon tube and foil gauge good as fluid pressure signal collecting unit versatility, range ability is wide, is connected with existing machinery formula tensimeter technology.The present invention reduces system power dissipation through adopting the low-power consumption micro computing machine; Be employed in and do not have the automatic technological system power dissipation that further reduces of screen that closes of the time of use; Microcomputer carries 16 perhaps digital to analog converters of 24; In amplifying circuit, be connected with negative tempperature coefficient thermistor and carry out temperature compensation, thereby make the precision of measurement result and stability improve greatly.
Digital pressure gauge of the present invention, measurement range from tens of kPas to hundreds of MPas, and as long as changing the different bourdon tube of Young modulus is convertible pressure measurement range, and cost is very low, it is big more to have overcome existing digital pressure gauge range, the shortcoming that cost is high more.
Description of drawings
Fig. 1 is a bourdon tube foil gauge combined type digital tensimeter schematic diagram of the present invention
Fig. 2 is that manometric resistance strain gage of bourdon tube foil gauge combined type digital of the present invention and temperature compensation sheet are pasted synoptic diagram
Fig. 3 full-bridge circuit schematic diagram
Fig. 4 is the used thermistor elementary diagram of the present invention.
Among the figure: the 1-bourdon tube; 2-the 1st resistance strain gage; 3-the 2nd resistance strain gage; 4-the 3rd resistance strain gage; 5-the 4th resistance strain gage; The 6-joint; 7-the 1st temperature compensation sheet; 8-the 2nd temperature compensation sheet.
Embodiment
Pressure transducer exemplary construction of the present invention is as shown in Figure 2, is pasting the 1st resistance strain gage 2, the 2 resistance strain gages 3, the 3 resistance strain gages 4, the 4 resistance strain gages 5 vertically in C type bourdon tube 1 inside and outside both sides; The 1st resistance strain gage 2 and the 2nd resistance strain gage 3 symmetries; The 3rd resistance strain gage 4 and the 4th resistance strain gage 5 symmetries; Four sheet resistance foil gauges connect to form the full-bridge circuit (see figure 3), in this full-bridge circuit, have added the 1st temperature compensation sheet 7 and the 2nd temperature compensation sheet 8 (like resistance R among Fig. 46 and resistance R 5) in addition.Because C type spring intraductal pressure equates that bourdon tube the same side telescopic variation rate everywhere is equal basically, therefore only need be inside and outside C type bourdon tube both sides vertically each symmetrical stickup two sheet resistance foil gauge form full-bridge circuit.Consider that in addition the bourdon tube temperature influence is easy to generate deformation, therefore in this full-bridge circuit, having added 2 temperature compensation sheets in addition carries out temperature compensation.Resistance strain gage adopts the constantan material, and paster technique property is good on elastic body, and elastic body and paster taping process do not exert an influence to bourdon tube (baud pipe).
The synoptic diagram of the full-bridge circuit of four resistance strain gage compositions is as shown in Figure 3: wherein the resistance value of the 1st resistance strain gage the 2, the 2nd resistance strain gage the 3, the 3rd resistance strain gage 4 and the 4th resistance strain gage 5 equates; Electric bridge is kept the condition R1*R4=R2*R3 of initial balance; Thereby electric bridge output Δ U should be zero in theory, and output voltage Δ U=U* Δ R1/R1.But because initially there is certain deformation in bourdon tube, so electric bridge output is non-vanishing, but can return to zero through software calibration, and output signal delta U and linear by measuring pressure.
Full-bridge circuit output signal delta U process signal condition: wherein signal condition comprises that signal filtering and signal amplify, and the signal filter mainly is the ripple signal among the filtering output voltage Δ U.Because full-bridge circuit output signal is very little; Therefore need to amplify through amplifier; The thermistor that in amplifying circuit, is added with negative temperature coefficient is to change the enlargement factor (as shown in Figure 4) of amplifier, and cardinal principle is in the time of variation of ambient temperature, and the resistance of negative temperature coefficient resister also corresponding variation can take place; Thereby change the enlargement factor of amplifier, the voltage of compensation full-bridge circuit output.Thereby the deformation that bourdon tube produces because of environment temperature changes output voltage Δ U.
Receive the A/D sample port of microcomputer after full-bridge circuit output signal amplifies through amplifier, the present invention is an example with 16 ADC.The microcomputer of selecting carries 16 digital to analog converter, thereby makes circuit structure simpler, has also practiced thrift the space of PCB (PrintedCircuitBoard, printed circuit board), has reduced the cost of manufacture of PCB.Most critical is that 16 the digital to analog converter that MCU carries has improved manometric precision to a great extent, obtains the minimum voltage Vmin=Vref/2 that differentiates of MCU according to digital-to-analog conversion minimum resolution computing formula
16V, the wherein inner digital-to-analog conversion reference voltage of Vref position MCU, and Vref=1.25V; Therefore calculate Vmin=0.019mV; And because pressure transducer maximum output voltage Δ U is 0.5mV, and enlargement factor is 20, the theoretical precision that therefore can calculate digital pressure gauge is 0.019mV/0.5*20mV=0.0019=0.19%FS; And the precision that actual experiment measures is 0.4%FS, has reached the requirement of GB.Further, adopt 24 ADC (digital to analog converter), precision will reach 0.1%FS.
Design novel display part and can show five kinds of different units such as PSI, BAR, KPA, MPA, KG respectively; Thereby make the display part practicality of design strengthen greatly; And microcomputer inside carries liquid crystal display and drives, thereby has further saved the space of PCB, and more reasonable aspect software design; Be mainly reflected in off working state and close screen automatically, further saved electrisity consumption.
Claims (8)
1. a bourdon tube foil gauge combined type digital tensimeter is characterized in that this digital pressure gauge comprises pressure transducer, signal conditioning circuit, microcomputer, LCD liquid crystal display, button, pressure tapping and watchcase; Described pressure transducer respectively pastes the full-bridge circuit that two pieces of resistance strain gages are linked to be through lead by both sides inside and outside the bourdon tube along axis symmetry; Adding two pieces of temperature compensation foil gauges that are connected in the full-bridge circuit forms; Its full-bridge circuit output terminal connects the signal conditioning circuit input end; The signal conditioning circuit output terminal connects the microcomputer sample port, and button is connected with microcomputer, and the microcomputer output terminal connects the LCD liquid crystal display; Bourdon tube one end is sealed into free end, and the other end is provided with and the pressure-source communication joint.
2. bourdon tube foil gauge combined type digital tensimeter according to claim 1; It is characterized in that: signal conditioning circuit comprises the filtering circuit and the signal amplification circuit of full-bridge circuit output signal; Its signal filter circuit output connects the input of signal amplification circuit; In the signal amplification circuit, be connected with of the temperature compensation of negative tempperature coefficient thermistor circuit as the output signal.
3. bourdon tube foil gauge combined type digital tensimeter according to claim 1 is characterized in that: described microcomputer carries 16 or 24 bit A/D converters, or adds 16 or 24 bit A/D converters.
4. bourdon tube foil gauge combined type digital tensimeter according to claim 1 is characterized in that: said microcomputer is single-chip microcomputer (super low-power consumption), ARM or DSP.
5. bourdon tube foil gauge combined type digital tensimeter according to claim 1 is characterized in that: microcomputer is provided with realizes startup self-detection, system hibernates, delay switching-off and low-voltage alert applications software.
6. bourdon tube foil gauge combined type digital tensimeter according to claim 1 is characterized in that described resistance strain gage (2) is constantan material or semiconductor material.
7. bourdon tube foil gauge combined type digital tensimeter according to claim 1 is characterized in that, this digital pressure gauge power supply adopts the civil power after battery or process power module are handled.
8. bourdon tube foil gauge combined type digital tensimeter according to claim 1; It is characterized in that: microcomputer shows through chip for driving control LCD liquid crystal display, in PSI, BAR, KPA, MPA or five kinds of different pressure units of KG, carries out unit through button and switch.
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103309379A (en) * | 2013-05-29 | 2013-09-18 | 辽宁科技大学 | Coke high-temperature dynamic reactivity controller |
CN103837285A (en) * | 2012-11-23 | 2014-06-04 | 上海朝辉压力仪器有限公司 | Pressure gage |
CN106228876A (en) * | 2016-10-21 | 2016-12-14 | 无锡职业技术学院 | A kind of high-precision pressure sensor experimental model and experimental technique thereof |
CN109682410A (en) * | 2017-10-19 | 2019-04-26 | 江苏扬航光电科技有限公司 | A kind of single-pass data acquisition device |
CN110608785A (en) * | 2019-08-22 | 2019-12-24 | 安徽省法米特物联技术有限公司 | Internet of things pressure liquid level meter and liquid level measurement method |
CN110926682A (en) * | 2019-12-11 | 2020-03-27 | 红旗仪表有限公司 | Mechanical pressure gauge |
CN113465675A (en) * | 2021-07-08 | 2021-10-01 | 大连交通大学 | Modularized high-sampling-rate wireless structure stress-strain measurement system and method |
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DE2943621A1 (en) * | 1979-10-29 | 1981-05-07 | Gebr. Hofmann Gmbh & Co Kg Maschinenfabrik, 6100 Darmstadt | Bourdon tube pressure transducer - has local needle indicator and strain gauges for remote indication |
CN85203516U (en) * | 1985-08-26 | 1986-04-30 | 李胜男 | Remote pressure meter with spiral boudon tube as strain beam |
CN101556196A (en) * | 2009-05-15 | 2009-10-14 | 胡书彬 | Combined method of a gas pressure complex detection system and device |
CN102252788A (en) * | 2011-04-06 | 2011-11-23 | 沈怡茹 | Compensation circuit for pressure sensor |
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2011
- 2011-12-15 CN CN2011104219495A patent/CN102519653A/en active Pending
Patent Citations (4)
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DE2943621A1 (en) * | 1979-10-29 | 1981-05-07 | Gebr. Hofmann Gmbh & Co Kg Maschinenfabrik, 6100 Darmstadt | Bourdon tube pressure transducer - has local needle indicator and strain gauges for remote indication |
CN85203516U (en) * | 1985-08-26 | 1986-04-30 | 李胜男 | Remote pressure meter with spiral boudon tube as strain beam |
CN101556196A (en) * | 2009-05-15 | 2009-10-14 | 胡书彬 | Combined method of a gas pressure complex detection system and device |
CN102252788A (en) * | 2011-04-06 | 2011-11-23 | 沈怡茹 | Compensation circuit for pressure sensor |
Non-Patent Citations (1)
Title |
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邹广平等: "弹簧管压力表改装为远传压力表的方法研究", 《应用科技》, vol. 30, no. 4, 30 April 2003 (2003-04-30) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103837285A (en) * | 2012-11-23 | 2014-06-04 | 上海朝辉压力仪器有限公司 | Pressure gage |
CN103309379A (en) * | 2013-05-29 | 2013-09-18 | 辽宁科技大学 | Coke high-temperature dynamic reactivity controller |
CN106228876A (en) * | 2016-10-21 | 2016-12-14 | 无锡职业技术学院 | A kind of high-precision pressure sensor experimental model and experimental technique thereof |
CN109682410A (en) * | 2017-10-19 | 2019-04-26 | 江苏扬航光电科技有限公司 | A kind of single-pass data acquisition device |
CN110608785A (en) * | 2019-08-22 | 2019-12-24 | 安徽省法米特物联技术有限公司 | Internet of things pressure liquid level meter and liquid level measurement method |
CN110926682A (en) * | 2019-12-11 | 2020-03-27 | 红旗仪表有限公司 | Mechanical pressure gauge |
CN113465675A (en) * | 2021-07-08 | 2021-10-01 | 大连交通大学 | Modularized high-sampling-rate wireless structure stress-strain measurement system and method |
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Application publication date: 20120627 |