CN2594768Y - Self-vibration absorbing floating differential flow pickup - Google Patents
Self-vibration absorbing floating differential flow pickup Download PDFInfo
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- CN2594768Y CN2594768Y CN 03228293 CN03228293U CN2594768Y CN 2594768 Y CN2594768 Y CN 2594768Y CN 03228293 CN03228293 CN 03228293 CN 03228293 U CN03228293 U CN 03228293U CN 2594768 Y CN2594768 Y CN 2594768Y
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Abstract
The utility model relates to a self-vibration damping floating type flow sensor which comprises detecting units which are symmetrically fixed on both surfaces of a flat plate, wherein each detecting unit comprises a casing body which is provided with a through hole which is parallel to an axial cord m-m of the flat plate. The through hole is communicated with an axial line outlet hole of the flat plate by a channel. Both ends of the through hole are respectively provided with an elastic sealing film sheet, and the inner part of the through hole is provided with two piezoelectric ceramic sheets. One end of each of the two piezoelectric ceramic sheets is respectively fixed with the elastic sealing film sheets, and the other end of each of the two piezoelectric ceramic sheets can be fixed with a metal block arranged between the two piezoelectric ceramic sheets. Gaps are arranged among the two piezoelectric ceramic sheets, the periphery of the metal block and the wall of the through hole. A leading wire of the metal block can be led out from the wire outlet hole of the flat plate through the channel. The sensor has high measuring sensitivity so that the sensor can make use of the differential principle to still give a strong detecting signal in the process of small flow. The inner structure of the utility model has strong anti-vibration performance. The utility model has the advantages of larger measuring range and 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 floated from vibration damping difference current quantity sensor.
Of the present utility modelly floatedly comprise that from the vibration damping flow 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, this through hole 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, two piezoelectric ceramic pieces are arranged in the through hole, one end of two piezoelectric ceramic pieces is fixed with flexible sheet respectively, the other end and the derby that is located between the piezoelectric ceramic piece are fixed, leave the gap between the periphery of two piezoelectric ceramic pieces and derby and the through-hole wall, the lead-in wire of derby is drawn from dull and stereotyped wire hole through passage.
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 floated 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 floatedly 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, this through hole 7 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, two piezoelectric ceramic pieces 3 are arranged in the through hole, the size of these two piezoelectric ceramic pieces, quality is all identical with sensitivity coefficient, and an end of two piezoelectric ceramic pieces welds with flexible sheet 1 respectively, and the other end and the derby 2 that is located between the piezoelectric ceramic piece weld.Like this, derby 2 and two piezoelectric ceramic pieces 3 are formed a rigid body, leave the gap between the periphery of this rigid body and the through-hole wall.Above-mentioned derby 2 preferably one have the mass of same size with piezoelectric ceramic piece.Derby 2 is simultaneously also as the output electrode of piezoelectric ceramic piece, and its lead-in wire is drawn from dull and stereotyped wire hole 4 through passage 8.Two piezoelectric ceramic pieces 3 up and down of each detecting unit must have equal pressurized pretightning force when mounted, so in the rigid body of forming by two piezoelectric ceramic pieces 3 and mass 2, have the interphase of an internal stress, because intermetallic metal mass 2 has certain thickness, so this stress interphase is bound in metal quality piece inside, and two piezoelectric ceramic pieces 3 are strict symmetry couplings, therefore can guarantee that in the masterpiece time spent that is equated these two piezoelectric ceramic pieces can produce equal electric charge.
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, floatedly 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, of the present utility modelly floatedly 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.Because the inertia effect of derby, laterally zygomorphic two piezoelectric ceramics sector-meetings difference pressurized and tension in the detecting unit, this makes two piezoelectric ceramic pieces produce equal positive and negative charge signal respectively, and when the signal of two piezoelectric ceramic pieces up and down in derby (electrode) during addition, 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 (4)
- One kind floated 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, this through hole (7) 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), two piezoelectric ceramic pieces (3) are arranged in the through hole, one end of two piezoelectric ceramic pieces is fixing with flexible sheet (1) respectively, the other end and the derby (2) that is located between the piezoelectric ceramic piece are fixing, leave the gap between the periphery of two piezoelectric ceramic pieces (3) and derby (2) and the through-hole wall, the lead-in wire of derby (2) is drawn from dull and stereotyped wire hole (4) through passage (8).
- 2. described floated from vibration damping difference current quantity sensor by claim 1, it is characterized in that said derby (2) is the mass that has with the piezoelectric ceramic piece same size.
- 3. described floated 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. described floated 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 03228293 CN2594768Y (en) | 2003-01-17 | 2003-01-17 | Self-vibration absorbing floating differential flow pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03228293 CN2594768Y (en) | 2003-01-17 | 2003-01-17 | Self-vibration absorbing floating differential flow pickup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2594768Y true CN2594768Y (en) | 2003-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03228293 Expired - Lifetime CN2594768Y (en) | 2003-01-17 | 2003-01-17 | Self-vibration absorbing floating differential flow pickup |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2594768Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699225B (en) * | 2009-10-26 | 2012-04-25 | 山东聊城科尔仪表科技有限公司 | Vortex-street flow sensing measuring method and special sensor |
-
2003
- 2003-01-17 CN CN 03228293 patent/CN2594768Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699225B (en) * | 2009-10-26 | 2012-04-25 | 山东聊城科尔仪表科技有限公司 | Vortex-street flow sensing measuring method and special sensor |
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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: 20050504 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |