CN2597950Y - Fixed self-vibration damping differential flow sensor - Google Patents
Fixed self-vibration damping differential flow sensor Download PDFInfo
- Publication number
- CN2597950Y CN2597950Y CNU032282923U CN03228292U CN2597950Y CN 2597950 Y CN2597950 Y CN 2597950Y CN U032282923 U CNU032282923 U CN U032282923U CN 03228292 U CN03228292 U CN 03228292U CN 2597950 Y CN2597950 Y CN 2597950Y
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- hole
- piezoelectric ceramic
- vibration damping
- fixed
- quantity sensor
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- Expired - Lifetime
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- 238000013016 damping Methods 0.000 title claims description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 30
- 230000035945 sensitivity Effects 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000036039 immunity Effects 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 2
- 238000009413 insulation Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 13
- 238000005259 measurement Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a fixed self vibration reduction differential flow transducer, which comprises a detection unit oppositely fixed on two faces of a plane; wherein each detection unit comprises a shell, and the shell has a through hole parallel to the axial line m-m of a flat slab; wherein the through hole is provided with a convex stand in the middle to separate the through hole into an upper area and a lower area opposite to each other, and two elastic membranes are arranged at both sides of the through hole to seal the two sides; while each separated area is provided with a piezoelectric ceramic chip and an insulation mass block clamped between the convex stand and the piezoelectric ceramic chip; wherein one end of the piezoelectric ceramic chip is fixed with the elastic membranes, while the leads of the upper and lower piezoelectric ceramic chips are connected and leaded out from the flat slab leading hole. The utility model has relatively high measuring sensitivity and can still send out relatively strong detection signals by using differential principle when in small flow; and in addition, the inner structure has self vibration reduction function, relatively strong immunity and large span scope as well as high reliability.
Description
Technical field
The utility model 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 that the purpose of this utility model provides a kind of measurement, strong interference immunity fixed from vibration damping difference current quantity sensor.
Of the present utility modelly 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 from dull and stereotyped wire hole through passage up and down.
Sensor of the present utility model 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 a fixed axial semisectional view from the vibration damping flow sensor of the present utility model;
Fig. 2 is the application principle figure of the utility model in vortex shedding flow meter;
Fig. 3 is the application principle figure of the utility model in vortex precession flowmeter.
Embodiment
With reference to Fig. 1, of the present utility modelly 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 utility model is referring to Fig. 2, Fig. 3.
Fig. 2 is the application of the utility model 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 utility model, 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 utility model, 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 utility model has very high anti-interference in flow measurement.Be applicable to the flow measurement of vibration fluids such as liquid, gas vapor.
Claims (5)
- One kind 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 matter gauge block (2) are arranged respectively in each interval, one end of piezoelectric ceramic piece and flexible sheet (1) are fixing, insulating matter gauge block (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 matter gauge block (2) and the through-hole wall, the lead-in wire of two piezoelectric ceramic pieces (3) joins and draws from dull and stereotyped wire hole (4) through passage (8) up and down.
- 2. described fixed from vibration damping difference current quantity sensor by claim 1, it is characterized in that said insulating matter gauge block (2) is the insulating ceramics piece.
- 3. described fixed from vibration damping difference current quantity sensor by claim 1, it is characterized in that size, quality and the sensitivity coefficient of four piezoelectric ceramic pieces (3) in two detecting units is all identical.
- 4. by claim 1,2 described fixed, it is characterized in that four masses (2) in two detecting units have identical size and quality from vibration damping difference current quantity sensor.
- 5. 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 |
|---|---|---|---|
| CNU032282923U CN2597950Y (en) | 2003-01-17 | 2003-01-17 | Fixed self-vibration damping differential flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032282923U CN2597950Y (en) | 2003-01-17 | 2003-01-17 | Fixed self-vibration damping differential flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2597950Y true CN2597950Y (en) | 2004-01-07 |
Family
ID=34164227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032282923U Expired - Lifetime CN2597950Y (en) | 2003-01-17 | 2003-01-17 | Fixed self-vibration damping differential flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2597950Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378498A (en) * | 2020-10-19 | 2021-02-19 | 姚宁 | Anti-seismic high-sensitivity induction detection sensor measuring device |
-
2003
- 2003-01-17 CN CNU032282923U patent/CN2597950Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378498A (en) * | 2020-10-19 | 2021-02-19 | 姚宁 | Anti-seismic high-sensitivity induction detection sensor measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20050622 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |