CN201488851U - High-accuracy vibrating-wire pressure sensor - Google Patents
High-accuracy vibrating-wire pressure sensor Download PDFInfo
- Publication number
- CN201488851U CN201488851U CN2009200292911U CN200920029291U CN201488851U CN 201488851 U CN201488851 U CN 201488851U CN 2009200292911 U CN2009200292911 U CN 2009200292911U CN 200920029291 U CN200920029291 U CN 200920029291U CN 201488851 U CN201488851 U CN 201488851U
- Authority
- CN
- China
- Prior art keywords
- film
- extension
- pressure sensor
- accuracy
- working
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses a high-accuracy vibrating wire pressure sensor. The diameter of a deformed membrane boss of the conventional working membrane is made 60 to 90 percent of that of a deformed membrane; the working membrane body is provided with an extension section in the direction of a hydraumatic joint; a blind hole to the deformed membrane is machined on the extension section; internal threads are machined on the blind hole wall or external threads are machined on the circumference surface of the extension section; the hydraumatic joint is in threaded connection with the extension section through the internal threads or the external threads; and sealant is coated at a threaded connection position. In the high-accuracy vibrating wire pressure sensor, the diameter of the deformed membrane boss is 60 to 90 percent of that of the deformed membrane and the hydraumatic joint and a threaded connection section of the working membrane are extended to increase the height of the threaded connection section greatly, so that the number of the threads is increased, the sealant is convenient for coating and sealing, the sealing effect is improved, and the effect of the lateral expansion force of liquid on accuracy.
Description
Technical field
The utility model 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.
The utility model content
The purpose of this utility model is the vibrating wire pressure sensor that proposes a kind of pin-point accuracy.
The technical solution of the utility model 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 utility model obtains is:
1, the vibrating wire sensor mathematical models of one of utility model people 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 the utility model working film 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 utility model, 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: the utility model error 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 utility model is a breakthrough in vibrating wire pressure sensor field.
In a word, the utility model 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 utility model;
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 utility model embodiment one, as Fig. 1, Fig. 2 and shown in Figure 3, structure of the present utility model 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-F
0=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. 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 |
|---|---|---|---|
| CN2009200292911U CN201488851U (en) | 2009-07-12 | 2009-07-12 | High-accuracy vibrating-wire pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200292911U CN201488851U (en) | 2009-07-12 | 2009-07-12 | High-accuracy vibrating-wire pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201488851U true CN201488851U (en) | 2010-05-26 |
Family
ID=42427724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200292911U Expired - Fee Related CN201488851U (en) | 2009-07-12 | 2009-07-12 | High-accuracy vibrating-wire pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201488851U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603868B (en) * | 2009-07-12 | 2011-02-09 | 邓铁六 | High-accuracy vibrating wire pressure sensor |
| CN102506959A (en) * | 2011-10-18 | 2012-06-20 | 中环天仪股份有限公司 | Sensor assembly |
| CN105091806A (en) * | 2015-08-24 | 2015-11-25 | 南京南瑞集团公司 | High pressure-resistant vibrating wire strain gauge |
| CN106353026A (en) * | 2016-08-12 | 2017-01-25 | 山东佰测传感科技股份有限公司 | Pressure instrument with excellent damp-proof function |
-
2009
- 2009-07-12 CN CN2009200292911U patent/CN201488851U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603868B (en) * | 2009-07-12 | 2011-02-09 | 邓铁六 | High-accuracy vibrating wire pressure sensor |
| CN102506959A (en) * | 2011-10-18 | 2012-06-20 | 中环天仪股份有限公司 | Sensor assembly |
| CN102506959B (en) * | 2011-10-18 | 2013-05-29 | 中环天仪股份有限公司 | Sensor assembly |
| CN105091806A (en) * | 2015-08-24 | 2015-11-25 | 南京南瑞集团公司 | High pressure-resistant vibrating wire strain gauge |
| CN105091806B (en) * | 2015-08-24 | 2017-09-15 | 南京南瑞集团公司 | High pressure resistant vibrating string extensometer |
| CN106353026A (en) * | 2016-08-12 | 2017-01-25 | 山东佰测传感科技股份有限公司 | Pressure instrument with excellent damp-proof function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101603868B (en) | High-accuracy vibrating wire pressure sensor | |
| CN105841858B (en) | A kind of fiber Bragg grating type pressure sensor for the complete stress measurement of ground | |
| EP2691754B1 (en) | Pressure-tight encapsulated differential pressure sensor | |
| CN202903128U (en) | Strain measuring device for concrete structural body | |
| CN104132767B (en) | A kind of pressure transmitter based on MEMS | |
| CN201488851U (en) | High-accuracy vibrating-wire pressure sensor | |
| CN102162757B (en) | Fiber grating earth pressure sensor | |
| CN105066869A (en) | Transverse deviation double sensitive gate interdigital metal strain sheet capable of measuring surface strain transverse partial derivative | |
| CN101710007A (en) | Concrete wall body expansion internal stress measuring sensor and measuring method | |
| CN110501098A (en) | A kind of highly sensitive micro-pressure sensor based on double pressure membranes and weak coupling resonator system | |
| CN102175137B (en) | Extensometer for measuring micro-deformation of component | |
| CN202350745U (en) | Optical grating displacement meter | |
| CN200993573Y (en) | Device for measuring highway surface structural strain | |
| CN207946294U (en) | Cylindrical structure transversely deforming measuring device | |
| CN207502701U (en) | A kind of magnetic field sensor based on long-period fiber grating | |
| CN105628279A (en) | Regular-dodecahedron pressure sensor | |
| CN103822609B (en) | A kind of two telescopic optical fiber Bragg raster sedimentometer | |
| CN208443332U (en) | Measure the resistance-strain type bilateral displacement sensor of reinforced concrete member deformation | |
| CN209470662U (en) | A kind of tool-type strain transducer | |
| CN202216671U (en) | Fiber grating displacement meter | |
| CN204788747U (en) | Answer variant cheng sanwei force transducer in a small amount | |
| CN209214813U (en) | The micro- fusion pressure force snesor of glass | |
| CN208736754U (en) | The mechanical property test structure of scaffold right-angle coupler | |
| EP4150308A1 (en) | Connecting piece for fluid-conducting line systems | |
| CN202433131U (en) | Device for inspecting load of bolt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20100712 |