CN1206517C - Fixed type self vibration damping difference flow sensor - Google Patents
Fixed type self vibration damping difference flow sensor Download PDFInfo
- Publication number
- CN1206517C CN1206517C CN 03114983 CN03114983A CN1206517C CN 1206517 C CN1206517 C CN 1206517C CN 03114983 CN03114983 CN 03114983 CN 03114983 A CN03114983 A CN 03114983A CN 1206517 C CN1206517 C CN 1206517C
- Authority
- CN
- China
- Prior art keywords
- piezoelectric ceramic
- hole
- ceramic piece
- vibration damping
- sensor
- 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
Abstract
The present invention relates to a fixed self-vibration damping differential flow sensor which comprises detection units symmetrically fixed on both sides of a flat plate, wherein each of the detection unit comprises a shell which is provided with a through hole parallel to the axial line m-m of the flat plate. A lug boss by which the through hole is equally divided into two symmetrical regions of an upper region and a lower region is arranged in the middle of the through hole; both ends of the through hole are respectively sealed by an elastic diaphragm. A piezoelectric ceramic piece and an insulating mass block clamped between the lug boss and the piezoelectric ceramic piece are respectively arranged in each of the regions. One end of each of the piezoelectric ceramic pieces and the elastic membranes are fixed; the leading wires of the upper piezoelectric ceramic piece and the lower piezoelectric ceramic piece are connected and are led out from a wire outlet hole. The sensor has high measurement sensitivity, and is still capable of providing strong detection signals by the differential principle when in small flow rate. The inner structure of the sensor has the self-vibration damping function, and has strong anti-interference performance, large measuring range and high reliability.
Description
Technical field
The present invention relates to flow sensor, especially from vibration damping difference current quantity sensor.
Background technology
Latter stage in the sixties, the novel instrument that has occurred applicating fluid vibration principle measurement flow in succession, for example, vortex shedding flow meter, fluidic flowmeter and vortex precession flowmeter all belong to liquid vibration formula flowmeter, they detect the fluid oscillation frequency signal that is directly proportional with volumetric flow rate by the flow sensor of detection modes such as temperature-sensitive, strain, electric capacity, ultrasound wave.For the oscillatory type flow sensor, vibration problem is to weigh an important indicator of a vibratory flowmeter commercial Application quality.Vibration in the industry is ubiquitous, for example velocity fluctuation, fluid oscillating under the fluid turbulence state, and enchancement factors such as industrial pipeline vibration, valve opening and closing and valve core vibration, and this all can make detected frequency signal be subjected to great noise.Advanced at present oscillatory type flow sensor all has certain anti-vibration ability.But the detecting element of these sensors all is fixed on the tube wall, resists the limited in one's ability of pipe vibration.In addition for the interference of fluid oscillation, in the time of the direction of vibration parallel (i.e. vibration in the same way) of the direction of vibration of vibration noise and institute measured frequency signal, the antijamming capability of these flow sensors is all more weak, and output signal can be sneaked into a large amount of noises.This phenomenon is especially obvious when low discharge is measured.
Summary of the invention
It is highly sensitive to the purpose of this invention is to provide a kind of measurement, strong interference immunity fixed from vibration damping difference current quantity sensor.
Of the present inventionly fixedly comprise that from vibration damping difference current quantity sensor symmetry is fixed on the detecting unit on dull and stereotyped two sides, each detecting unit comprises housing, housing has the parallel through hole with dull and stereotyped axis m-m, there is one through hole is divided into the boss of two symmetric intervals up and down in the middle of this through hole, the aperture of two symmetric intervals is greater than aperture, boss place, the boss place has passage to be connected with the axial wire hole of flat board, the flexible diaphragm seal respectively of the two ends of through hole, piezoelectric ceramic piece and annular insulating matter gauge block are arranged respectively in each interval, one end and the flexible sheet of piezoelectric ceramic piece are fixed, the insulating matter gauge block is clipped in the middle of boss and the piezoelectric ceramic piece, leave the gap between the periphery of piezoelectric ceramic piece and insulating matter gauge block and the through-hole wall, the lead-in wire of two piezoelectric ceramic pieces joins and draws the size of four piezoelectric ceramic pieces in two above-mentioned detecting units through passage from dull and stereotyped wire hole up and down, quality is all identical with sensitivity coefficient.
Sensor of the present invention has higher measurement sensitivity, utilizes differential principle still can provide stronger detection signal when low discharge, and its inner structure has from vibration-damping function, stronger anti-interference and relatively large journey scope is arranged, the reliability height.
Description of drawings
Fig. 1 is fixed axial semisectional view from the vibration damping flow sensor;
Fig. 2 is the application principle figure of the present invention in vortex shedding flow meter;
Fig. 3 is the application principle figure of the present invention in vortex precession flowmeter.
Embodiment
With reference to Fig. 1, fixedly comprise that from the vibration damping flow sensor symmetry is fixed on the detecting unit on dull and stereotyped 6 two sides, each detecting unit comprises housing 5, in order to obtain more stable signal, the general semi-cylindrical shells that adopts, housing 5 has the through hole 7 parallel with dull and stereotyped axis m-m, there is one through hole is divided into the boss of two symmetric intervals up and down in the middle of this through hole 7, the aperture of two symmetric intervals is greater than aperture, boss place, the boss place has passage 8 to be connected with the axial wire hole 4 of flat board, respectively flexible diaphragm 1 sealing in the two ends of through hole 7, piezoelectric ceramic piece 3 and annular insulating ceramics piece 2 are arranged respectively in each interval, one end of piezoelectric ceramic piece and flexible sheet 1 welding, insulating ceramics piece 2 is clipped in the middle of boss and the piezoelectric ceramic piece, leaves the gap between the periphery of piezoelectric ceramic piece 3 and insulating ceramics piece 2 and the through-hole wall.The lead-in wire of two piezoelectric ceramic pieces joins and draws from dull and stereotyped wire hole 4 through passage 8 up and down.Four piezoelectric ceramic pieces have identical size, quality and sensitivity coefficient in two detecting units, and the pretightning force that equates, four insulating ceramics pieces have identical size and quality too.
Concrete application of the present invention is referring to Fig. 2, Fig. 3.
Fig. 2 is the application of the present invention in vortex shedding flow meter, for the flow of measuring vibrations fluid, fixedly is installed in the back of vortex generation body A in the vortex shedding flow meter from vibration damping flow sensor B of the present invention, and sensor is parallel with vortex generation body; And, fixedly should be installed in runner expanding section front end from the vibration damping flow sensor, the axis m-m of sensor plate and the intersect vertical axis of pipeline for vortex precession flowmeter shown in Figure 3.
During work, whole sensor all is immersed in the fluid.When bumpy flow during through sensor, the alternating pressure that vortex produces acts directly on the flexible sheet of two detecting units, makes piezoelectric ceramic piece produce the alternation electric charge.At this moment two detecting units can be exported regular sinusoidal signal S1 and S2, these two signal frequencies equate, 180 ° of phase phasic differences, and then the output signal between two output lines is S1-S2, even in low discharge, utilize differential output can obtain stronger detection signal like this.
When fluid since stochastic factor such as pipe vibration, valve opening when fluid oscillating takes place, can cause flexible sheet or sensor housing to produce and follow vibration.This makes laterally zygomorphic two piezoelectric ceramics sector-meetings difference pressurized and tension in the detecting unit, so two piezoelectric ceramics sector-meetings produce the positive and negative charge signal that equates, and when the signal plus of two piezoelectric ceramic pieces up and down, the charge signal that disturbs vibration to be produced can be cancelled out each other, thereby sensor has played from damping effect.
In addition, for sensor of the present invention, pipe vibration belongs to vibration in the same way, and sensor is to adopt two detecting units to carry out differential detection, therefore the undesired signal of vibration can be cancelled out each other in output signal S1-S2 in the same way, can eliminate the interference of pipe vibration to detection signal effectively like this.And the fluid oscillation that causes for fluid pulsation, it is the plane waves that row are propagated along with flow direction in pipeline, the pressure that it causes acts on simultaneously with identical direction on two detecting units of sensor, belongs to vibration interference in the same way.In like manner, the differential detection principle of sensor can be pulsed to the interference of detection signal by eliminate fluid.Therefore, flow sensor of the present invention has very high anti-interference in flow measurement.Be applicable to the flow measurement of vibration fluids such as liquid, gas vapor.
Claims (2)
1. fixed from vibration damping difference current quantity sensor, it is characterized in that comprising that symmetry is fixed on the detecting unit on flat board (6) two sides, each detecting unit comprises housing (5), housing (5) has the through hole (7) parallel with dull and stereotyped axis m-m, there is in the middle of this through hole (7) one through hole is divided into the boss of two symmetric intervals up and down, the aperture of two symmetric intervals is greater than aperture, boss place, the boss place has passage (8) to be connected with the axial wire hole (4) of flat board, flexible diaphragm (1) sealing respectively of the two ends of through hole (7), piezoelectric ceramic piece (3) and annular insulating ceramics piece (2) are arranged respectively in each interval, one end of piezoelectric ceramic piece and flexible sheet (1) are fixing, insulating ceramics piece (2) is clipped in the middle of boss and the piezoelectric ceramic piece, leave the gap between the periphery of piezoelectric ceramic piece (3) and insulating ceramics piece (2) and the through-hole wall, the lead-in wire of two piezoelectric ceramic pieces (3) joins and draws the size of four piezoelectric ceramic pieces (3) in two above-mentioned detecting units through passage (8) from dull and stereotyped wire hole (4) up and down, quality is all identical with sensitivity coefficient.
2. described fixed from vibration damping difference current quantity sensor by claim 1, it is characterized in that said housing (5) is half-cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114983 CN1206517C (en) | 2003-01-17 | 2003-01-17 | Fixed type self vibration damping difference flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114983 CN1206517C (en) | 2003-01-17 | 2003-01-17 | Fixed type self vibration damping difference flow sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1431472A CN1431472A (en) | 2003-07-23 |
| CN1206517C true CN1206517C (en) | 2005-06-15 |
Family
ID=4790547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03114983 Expired - Fee Related CN1206517C (en) | 2003-01-17 | 2003-01-17 | Fixed type self vibration damping difference flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1206517C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114964391B (en) * | 2022-07-28 | 2022-11-01 | 潍坊奥博仪表科技发展有限公司 | Anti-seismic vortex shedding flowmeter probe structure |
-
2003
- 2003-01-17 CN CN 03114983 patent/CN1206517C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1431472A (en) | 2003-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5394506B2 (en) | Vortex flowmeter with vortex vibration sensor plate | |
| EP3488192B1 (en) | Vortex flowmeter with reduced process intrusion | |
| CN202255473U (en) | Intelligent quake-proof vortex precession flow meter | |
| US4169376A (en) | External sensing system for vortex-type flowmeters | |
| CN1206517C (en) | Fixed type self vibration damping difference flow sensor | |
| CN2597950Y (en) | Fixed self-vibration damping differential flow sensor | |
| CN1200253C (en) | Suspension type self vibration damping difference flow sensor | |
| CN2594768Y (en) | Self-vibration absorbing floating differential flow pickup | |
| RU47097U1 (en) | VORTEX FLOW METER SENSOR (OPTIONS) | |
| CN100424474C (en) | Externally-connected inductive flow sensor | |
| US4572003A (en) | Sidetone generator flowmeter | |
| CN2849666Y (en) | External multi-point induction flow sensor | |
| CN2849667Y (en) | Plane type multi-sensitive face flow sensor | |
| RU2351900C2 (en) | Rate-of-flow indicator of liquid mediums in pipelines | |
| RU2765608C1 (en) | Non-invasive sensor for vortex flow meter | |
| GB2148003A (en) | Measurement of flowrate | |
| JPS58160813A (en) | Vortex flow meter | |
| CN100424475C (en) | External multi-point inductive flow sensor | |
| CN2849665Y (en) | External linked induction flow sensor | |
| RU207419U1 (en) | ULTRASONIC GAS FLOW SENSOR | |
| RU222980U1 (en) | HOUSING OF THE FLOW PART OF A VORTEX FLOWMETER WITH TWO ELECTRONIC UNITS | |
| CN104655197A (en) | Suspension type self-vibration suppression differential flow sensor | |
| RU206991U1 (en) | VIBRATION TRANSMITTER | |
| RU82320U1 (en) | PROBE VORTEX FLOW SENSOR | |
| RU18852U1 (en) | FLOW SENSOR |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20050615 Termination date: 20100219 |