CN101603868A - High-accuracy vibrating wire pressure sensor - Google Patents
High-accuracy vibrating wire pressure sensor Download PDFInfo
- Publication number
- CN101603868A CN101603868A CNA2009100172115A CN200910017211A CN101603868A CN 101603868 A CN101603868 A CN 101603868A CN A2009100172115 A CNA2009100172115 A CN A2009100172115A CN 200910017211 A CN200910017211 A CN 200910017211A CN 101603868 A CN101603868 A CN 101603868A
- Authority
- CN
- China
- Prior art keywords
- film
- extension
- processed
- deformation film
- deformation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of high-accuracy vibrating wire pressure sensor, it mainly is the 60%-90% that the deformation film boss diameter of work on hand film is become the deformation film diameter; Described working film body has an extension to the hydraulic joint direction, be processed with blind hole on the extension to deformation film, be processed with internal thread on the blind pore wall or on the periphery of extension, be processed with external thread, realize being threaded of hydraulic joint and extension by internal thread or external thread; And scribble fluid sealant at connection of thread.The present invention is because deformation film boss diameter is the 60%-90% of deformation film diameter, and hydraulic joint and the working film elongated segment that is threaded, the section of being threaded is increased highly greatly, thereby increase the screw thread channel number, be convenient to the gluing sealing, improved sealing function, eliminated of the influence of the horizontal expansive force of liquid accuracy.
Description
Technical field
The invention belongs to liquid-pressure pick-up.
Background technology
The structure of present vibrating wire pressure sensor as shown in Figure 5, be that a end at sensor outer housing 9 is equipped with working film, the structure of working film is, process annular groove a cylindrical end feed, the middle little boss 14 that forms forms working film body 2, the bottom of body 2 is as deformation film 13, be processed with external thread on the body 2 two terminal circle side faces, end in deformation film is connected with hydraulic joint 1 by external thread, the other end of working film is connected with sensor outer housing 9 by external thread, string frame 3 is installed in the shell 9, the post to which the strings of a musical instrument are attached 4, string wire 6, headplate 7, string presss from both sides 5 chords folder 8, the other end of sensor outer housing 9 is equipped with bonnet 10 and cable splice 11, be processed with screw on the boss 14, the post to which the strings of a musical instrument are attached 4 is threaded in the screw of small boss 14.
This vibrating string type sensor is applicable to wet environment, and long-time stability are good, and the life-span, the output frequency signal antijamming capability was strong more than 10 years, is fit to long-distance transmissions, the extensible cable.Because above-mentioned advantage is widely applied in monitoring rock and soil engineering, also in colliery, traffic industries such as (dynamic vehicle are weighed), use simultaneously.But present vibrating wire pressure sensor has following deficiency: 1, the small boss at former deformation film center designs for connecting the post to which the strings of a musical instrument are attached, because diameter very little (being generally below 30% of deformation film diameter), only play the effect that connects the post to which the strings of a musical instrument are attached, can be considered a flat film that the two sides is parallel when therefore deformation film is worked, when applying fluid pressure, the distortion complexity of flat film and core distortion are bigger, so accuracy is low.2, the height of the thread segment of deformation film one end is minimum, and several roads screw thread is only arranged, so cause greatly and the liquid applanation is big with the sealing difficulty of hydraulic joint, highly pressurised liquid enters thread gaps easily and produces horizontal expansive force, has a strong impact on accuracy.In general, the error of this structure is about 1%FS, and the hysteresis of backhaul is bigger.So mostly adopting sensor error in the occasion of big pressure pin-point accuracy is the resistance strain type pressure sensor of 0.1%FS.But resistance strain type pressure sensor is not suitable for wet environment (it is too high to insulating requirements), and long-time stability are relatively poor, the life-span is short, is output as the mV magnitude voltage signals and is subject to disturb unsuitable spreading cable; Extraordinary (as plated film) resistance-strain type pressure unit (pressure transducer adds the electric current loop output circuit) solves these problems, but too expensive.Therefore be necessary to research and develop and a kind ofly be applied to that cost under the rugged surroundings is low, accuracy is high, hysteresis is little, long-time stability are good and the vibratory string pressure transducer of signal long-distance transmissions occasion.
Summary of the invention
The objective of the invention is to propose a kind of vibrating wire pressure sensor of pin-point accuracy.
Technical scheme of the present invention is: a kind of high-accuracy vibrating wire pressure sensor, its structure is that shell one end at sensor is equipped with working film, be processed with deformation film on the working film, the working film body is connected with outer casing screw, string frame, the post to which the strings of a musical instrument are attached, string folder, string wire and headplate are installed in the shell, the other end of shell is provided with bonnet and cable splice, the post to which the strings of a musical instrument are attached is threaded in the screw of deformation film boss, it is characterized in that, boss diameter on the described deformation film is the 60%-90% of deformation film diameter, makes the deformation film of an annular of part formation of practical distortion; Described working film body has an extension to the hydraulic joint direction, be processed with blind hole on the extension to deformation film, be processed with internal thread on the blind pore wall or on the periphery of extension, be processed with external thread, realize being threaded of hydraulic joint and extension by internal thread or external thread; And scribble fluid sealant at the connection of thread of hydraulic joint and extension.
For enhanced leaktightness, place O-ring seals again at the relief groove place of blind hole, screw in hydraulic joint then and tighten, further stop highly pressurised liquid to enter to be threaded in the slit.
The good effect that the present invention obtains is:
1, the vibrating wire sensor mathematical models of one of inventor Deng Tie proposition in 6 years is the second-degree parabola formula:
In the formula: A, B---sensor constants, calibration data can be imported the least square method data processor and obtain;
Output frequency when f---pressure is P;
f
0---the frequency during P=0 is called just frequency or zero-frequency.
Facts have proved, use this formula match and not only be convenient to use computer rapidly and accurately by f calculating P value, significantly improve the accuracy of vibrating wire sensor, and for having reached stable sensor through overaging, when temperature variation not too big (for example ± 50 ℃), still A, B can be used as constant, the first frequency of this temperature lower sensor is imported as f
0, calculate the P value by f, need not to add in addition the temperature compensation.Resistance strain type sensor then must add hardware, software temperature compensation, and is cumbersome.
Because the deformation film convex platform diameter of working film of the present invention is the 60%-90% of deformation film diameter, make the part of practical distortion form annular deformation film, so the pressure at right angle of liquid body is done the time spent, the simple shear distortion only takes place, the displacement at deformation film center (displacement) is directly proportional with fluid pressure, and the better elastic recovery ability arranged, make pressure-frequency curve meet the second-degree parabola rule, be convenient to above-mentioned second-degree parabola mathematical model match, thereby obtain very high accuracy, and it is very little to lag behind.
2, the elongated segment because hydraulic joint and working film are threaded, the section of being threaded is increased highly greatly, thereby increase the screw thread channel number, be convenient to the gluing sealing, and formed relief groove during processing blind hole, in relief groove, be convenient to install O-ring seals, further improved sealing function, eliminated of the influence of the horizontal expansive force of liquid accuracy.
When 3, particularly extension adopts female thread structure, the joint pressure area is reduced, under same pressure conditions, the pressure of joint face reduces greatly, thereby has thoroughly eliminated the influence of the horizontal expansive force of liquid to accuracy.
In order to prove pin-point accuracy of the present invention, make many group samples and carried out the experiment detection.Measure output frequency with GSJ-2 type Computerized tester during detection, demarcate 40MPa with piston type (counterweight) pressure testers, process, backhaul are respectively done twice, twice pressure-frequency data input least square method data processor is handled, drawing testing result shows: error of the present invention less than 0.1%FS, lag behind less than 0.1%FS, suitable with the accuracy of high-performance resistance strain type pressure sensor.So invention is a breakthrough in vibrating wire pressure sensor field.
In a word, the present invention had both possessed the advantage of vibrating wire pressure sensor self, possessed the pin-point accuracy of resistance strain type pressure sensor, the low advantage that lags behind again simultaneously, can be widely used in the remote engineering monitoring of chronicity under the various wet environments, and cost reduces greatly than resistance strain type pressure sensor.
Description of drawings
Fig. 1 is a front view of the present invention;
Fig. 2 is the structural map that internal thread connects working film;
Fig. 3 is the sectional drawing of the A-A of Fig. 2 and Fig. 4;
Fig. 4 is the structural map that external thread connects working film;
Fig. 5 is the structural map of existing vibrating string type sensor.
Marginal data: 1---hydraulic joint; 2---the working film body; 3---the string frame; 4---the post to which the strings of a musical instrument are attached; 5---the string folder; 6---string wire; 7---headplate; 8---the string folder; 9---shell; 10---bonnet; 11---cable splice; 12---fluid sealant; 13---deformation film; 14---boss; 15---internal thread; 16---external thread; 17---relief groove; 18---blind hole; 19---external thread.
Embodiment
Fig. 5 is the structural map of existing vibrating string type sensor, and its structure scape technology of passing away is described.
The embodiment of the invention one, as Fig. 1, Fig. 2 and shown in Figure 3, structure of the present invention is (existing working film structure is seen Fig. 4) except that working film, other essential structure with prior art is identical substantially.It comprises shell 9 and by external thread 16 be installed in the working film body 2 of shell 9 left ends and string frame 3, the post to which the strings of a musical instrument are attached 4, string presss from both sides 5 chords folder 8, press from both sides 5 chords folder, the 8 fixing string wires 6 of going up by string, headplate 7 is installed on the string frame 3, bonnet 10 in the right-hand member shutoff of shell 9, and install cable splice 11, there is the four-core pair cable to be connected on the cable splice with the circuit of headplate 7.
As can be seen from Figure 2, the structure of embodiment one working film is, processes an annular groove in the feed of the right side of body 2, and the centre is a boss 14, be used to connect the screw of the post to which the strings of a musical instrument are attached 4 in the center processing of boss 14, process the external thread 16 that is used to connect shell 9 on the side face of right side; The left end of body 2 prolongs, processing internal thread 15 on blind hole 18 and the car on the extension, make left end form a heavy wall tubular, this moment, the intermediate isolating of body 2 partly constituted circular membrane 13, that is to say that circular membrane 13 directly processes on working film body 2, for guaranteeing that working film has favorable elasticity, adopt the superior alloy steel manufacturing, and heat-treat.Hydraulic joint 1 scribbles fluid sealant 12 with the connection of thread of extension.Perhaps install O-ring seals (not drawing among the figure) at screw relief groove place again.
Embodiment two, and the structure of embodiment two and embodiment one are basic identical, and difference is the syndeton of extension and hydraulic joint.It is to be processed with external thread on working film body 2 extensions, is connected with tapped hydraulic joint by external thread, and concrete structure is seen Fig. 4.As can be seen from Figure 4, the relief groove 17 that is processed with blind hole 18 on the extension of working film and forms is processed with external thread 19 on the extension periphery.Detailed construction is seen Fig. 1, is not described in detail in this.
From Fig. 2 and Fig. 3, also can find out the structure of annular working film, wherein φ
1Be deformation film external diameter (relief groove external diameter), φ
2Be deformation film internal diameter (being the boss diameter), φ
2/ φ
1=(60-90)/100, φ
1With φ
2Between constituted ring film 13.
Be the detection case of an embodiment below, the boss diameter is φ with the external diameter ratio of deformation film among the embodiment
2/ φ
1=70/100, the thickness of annular section should satisfy when the 40MP working pressure, and the deformation that makes diaphragm is in elastic limit.Testing result is seen attached list.
As can be seen from the table:
(1) process accuracy: error 0.02%FS, reproducibility error 0.07%FS;
(2) overall accuracy: the process maximum error is 0.04%FS, and the backhaul maximum error is 0.03%FS, and reproducibility error is 0.08%FS, and hysteresis error is 0.06%FS.
The sensor static parameter
Numbering: NO.8200 2009-5-27
Range: Pm=40MPa; Full scale output: Fm-Fo=425.09Hz; Temperature coefficient: a=0.025%FS/ ℃
Calibration: number of times: m=2, count: n=10
Process:
The work equation:
：A＝-2.501366E-05，B＝-1.020459E-03，F0＝2113.9199Hz
Error: Es=0.02%FS; Reproducibility error: Er=0.07%FS
Comprehensively:
The work equation:
：A＝-2.491911E-05，B＝-6.412156E-04，F0＝2113.9199Hz
Systematic error: Ec=0.04%FS; Reproducibility error: Er=0.08%FS; Fundamental error: E=Ec+Er=0.12%FS;
Hysteresis error: Eh=0.06%FS
Nominal data
Standard value process frequency backhaul frequency process frequency backhaul frequency
(MPa) (Hz) (Hz) (Hz) (Hz)
0 2113.84 2113.68 2114 2113.84
4 2075.31 2075.31 2075.46 2075.46
8 2036.06 2035.91 2036.21 2036.06
12 1995.98 1995.69 1996.12 1995.98
16 1954.96 1954.82 1955.1 1954.96
20 1913.35 1913.08 1913.35 1913.22
24 1870.63 1870.38 1870.63 1870.5
28 1826.95 1826.71 1826.95 1826.71
32 1782.06 1781.83 1782.06 1782.06
36 1736.17 1736.17 1736.06 1736.06
40 1688.68 1688.68 1688.98 1688.98
Process matched curve precision is checked comprehensive matched curve precision and is checked
Standard value process calculated value process fiducial error process calculated value process fiducial error backhaul calculated value backhaul fiducial error each point lags behind
(MPa) (MPa) (％FS) (MPa) (％FS) (MPa) (％FS) (％FS)
0 0.00 0.00 -0.01 0.02 0.01 0.02 0.04
4 4.00 0.00 3.99 0.03 3.99 0.03 0.00
8 8.00 0.01 7.99 0.04 8.00 0.00 0.04
12 12.00 0.01 11.99 0.03 12.01 0.02 0.05
16 16.01 0.02 16.00 0.00 16.01 0.03 0.03
20 20.00 0.00 19.99 0.02 20.01 0.03 0.05
24 24.00 0.00 23.99 0.02 24.01 0.02 0.04
28 28.00 0.01 27.99 0.03 28.01 0.03 0.06
32 32.00 0.00 32.00 0.01 32.01 0.02 0.03
36 36.00 0.00 36.00 0.01 36.00 0.01 0.00
40 40.00 0.00 40.00 0.00 40.00 0.00 0.00
Claims (2)
1, a kind of high-accuracy vibrating wire pressure sensor, it is that shell one end at sensor is equipped with working film, be processed with deformation film on the working film, the working film body is connected with outer casing screw, string frame, the post to which the strings of a musical instrument are attached, string folder, string wire and headplate are installed in the shell, the other end of shell is provided with bonnet and cable splice, the post to which the strings of a musical instrument are attached is threaded in the screw of deformation film boss, it is characterized in that, boss diameter on the described deformation film is the 60%-90% of deformation film diameter, makes the deformation film of an annular of part formation of practical distortion; Described working film body has an extension to the hydraulic joint direction, be processed with blind hole on the extension to deformation film, be processed with internal thread on the blind pore wall or on the periphery of extension, be processed with external thread, realize being threaded of hydraulic joint and extension by internal thread or external thread; And scribble fluid sealant at the connection of thread of hydraulic joint and extension.
2, high-accuracy vibrating wire pressure sensor as claimed in claim 1 is characterized in that, adds at the relief groove place of described blind hole to be placed with O-ring seals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100172115A CN101603868B (en) | 2009-07-12 | 2009-07-12 | High-accuracy vibrating wire pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100172115A CN101603868B (en) | 2009-07-12 | 2009-07-12 | High-accuracy vibrating wire pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101603868A true CN101603868A (en) | 2009-12-16 |
| CN101603868B CN101603868B (en) | 2011-02-09 |
Family
ID=41469691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100172115A Active CN101603868B (en) | 2009-07-12 | 2009-07-12 | High-accuracy vibrating wire pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101603868B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794358A (en) * | 2015-04-30 | 2015-07-22 | 无锡悟莘科技有限公司 | Parameter estimation and fitting method for collecting supporting point frequency in vibrating wire mode |
| CN106092425A (en) * | 2016-06-06 | 2016-11-09 | 南京南瑞集团公司 | A kind of high accuracy type vibration wire micro-pressure sensor |
| CN106525308A (en) * | 2016-08-24 | 2017-03-22 | 江西飞尚科技有限公司 | Reinforcement meter for measuring support axial force of foundation pit |
| CN106813822A (en) * | 2016-12-29 | 2017-06-09 | 江西飞尚科技有限公司 | A kind of method for improving the type vibration wire ventage piezometer calibration fitting a straight line linearity |
| CN108548629A (en) * | 2018-06-25 | 2018-09-18 | 成都安岩岩土工程技术有限公司 | A kind of osmometer |
| CN110579306A (en) * | 2019-09-17 | 2019-12-17 | 长江水利委员会长江科学院 | Vibrating wire type pressure sensor |
| CN116659432A (en) * | 2023-08-01 | 2023-08-29 | 中冶检测认证有限公司 | Self-calibration strain sensor for embedded concrete and calibration method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB882086A (en) * | 1957-05-20 | 1961-11-08 | Borg Warner | Differential pressure transducer |
| US3153351A (en) * | 1957-12-27 | 1964-10-20 | Borg Warner | Vibrating string transducer devices and systems employing the same |
| GB907240A (en) * | 1959-01-23 | 1962-10-03 | Borg Warner | Vibrating string transducer devices and systems for employing the same |
| CN2057509U (en) * | 1989-11-06 | 1990-05-23 | 山东矿业学院 | Steel string type displacement sensor |
| CN1060569C (en) * | 1996-02-15 | 2001-01-10 | 山东矿业学院 | Steels tring type force sensor |
| CN201488851U (en) * | 2009-07-12 | 2010-05-26 | 邓铁六 | High-accuracy vibrating-wire pressure sensor |
-
2009
- 2009-07-12 CN CN2009100172115A patent/CN101603868B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794358A (en) * | 2015-04-30 | 2015-07-22 | 无锡悟莘科技有限公司 | Parameter estimation and fitting method for collecting supporting point frequency in vibrating wire mode |
| CN106092425A (en) * | 2016-06-06 | 2016-11-09 | 南京南瑞集团公司 | A kind of high accuracy type vibration wire micro-pressure sensor |
| CN106092425B (en) * | 2016-06-06 | 2018-10-30 | 南京南瑞集团公司 | A kind of high-precision type vibration wire micro-pressure sensor |
| CN106525308A (en) * | 2016-08-24 | 2017-03-22 | 江西飞尚科技有限公司 | Reinforcement meter for measuring support axial force of foundation pit |
| CN106813822A (en) * | 2016-12-29 | 2017-06-09 | 江西飞尚科技有限公司 | A kind of method for improving the type vibration wire ventage piezometer calibration fitting a straight line linearity |
| CN108548629A (en) * | 2018-06-25 | 2018-09-18 | 成都安岩岩土工程技术有限公司 | A kind of osmometer |
| CN110579306A (en) * | 2019-09-17 | 2019-12-17 | 长江水利委员会长江科学院 | Vibrating wire type pressure sensor |
| CN116659432A (en) * | 2023-08-01 | 2023-08-29 | 中冶检测认证有限公司 | Self-calibration strain sensor for embedded concrete and calibration method |
| CN116659432B (en) * | 2023-08-01 | 2024-02-09 | 中冶检测认证有限公司 | Self-calibration strain sensor for embedded concrete and calibration method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101603868B (en) | 2011-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101603868B (en) | High-accuracy vibrating wire pressure sensor | |
| EP2691754B1 (en) | Pressure-tight encapsulated differential pressure sensor | |
| Godwin | An extended octagonal ring transducer for use in tillage studies | |
| CN202903128U (en) | Strain measuring device for concrete structural body | |
| CN102162757B (en) | Fiber grating earth pressure sensor | |
| CN201488851U (en) | High-accuracy vibrating-wire pressure sensor | |
| DE602005000859T2 (en) | Strain sensor and corresponding manufacturing process. | |
| US11473260B2 (en) | Effective stress cell for direct measurement of effective stress in saturated soil | |
| CN101710007A (en) | Concrete wall body expansion internal stress measuring sensor and measuring method | |
| CN106248267B (en) | Miniature three-dimensional soil pressure cell and its method of testing | |
| CN102175137B (en) | Extensometer for measuring micro-deformation of component | |
| CN200993573Y (en) | Device for measuring highway surface structural strain | |
| CN202350745U (en) | Optical grating displacement meter | |
| CN104697710B (en) | A kind of pressure sensor calibrating device with graininess solid as medium | |
| CN103822609B (en) | A kind of two telescopic optical fiber Bragg raster sedimentometer | |
| CN105628279A (en) | Regular-dodecahedron pressure sensor | |
| CN202083516U (en) | Pressure sensor based on micro-melting technology | |
| CN202339237U (en) | Elastomer of load sensor for oil field | |
| CN202216671U (en) | Fiber grating displacement meter | |
| DE102014211928A1 (en) | Pressure sensor for detecting a pressure of a fluid medium | |
| CN201569521U (en) | Expansion internal stress measuring sensor for concrete wall body | |
| CN112326076A (en) | Pressure sensor and installation mechanism thereof | |
| CN203216656U (en) | Bridge automatic tensioning device adopting spoke-type sensor to measuring forces | |
| CN2643280Y (en) | High-precision string wire type strain (stress) transducer | |
| CN216482840U (en) | Deformation monitoring device for steel-concrete composite structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Deng Tieliu Inventor after: Zhao Shengli Inventor after: Zhao Zhenyuan Inventor before: Deng Tieliu Inventor before: Zhao Zhenyuan |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: DENG TIELIU ZHAO ZHENYUAN TO: DENG TIELIU ZHAO SHENGLI ZHAO ZHENYUAN |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHAO ZHENYUAN BEIJING GOLD WEIGHING APPARATUS CO., Free format text: FORMER OWNER: ZHAO ZHENYUAN Effective date: 20150611 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150611 Address after: 271019 Shandong Province, Tai'an city Taishan District Daizong Street No. 223 Shandong University of Science and Technology Patentee after: Deng Tieliu Patentee after: Zhao Zhenyuan Patentee after: Anhui Gold Weighing Apparatus Co., Ltd. Address before: 271019 Shandong Province, Tai'an city Taishan District Daizong Street No. 223 Shandong University of Science and Technology Patentee before: Deng Tieliu Patentee before: Zhao Zhenyuan |