CN2257603Y - Piezoelectric swirl differential flow sensor - Google Patents
Piezoelectric swirl differential flow sensor Download PDFInfo
- Publication number
- CN2257603Y CN2257603Y CN 96203199 CN96203199U CN2257603Y CN 2257603 Y CN2257603 Y CN 2257603Y CN 96203199 CN96203199 CN 96203199 CN 96203199 U CN96203199 U CN 96203199U CN 2257603 Y CN2257603 Y CN 2257603Y
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- CN
- China
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- tower structure
- transmission shaft
- force transmission
- housing
- contact plate
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- Expired - Fee Related
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Abstract
The utility model relates to a piezoelectric type swirl differential flow sensor. The utility model is characterized in that a vortex generating body is perpendicularly fastened to the shaft line of the housing of a sensor; a tower structure with a driving shaft and a contact plate is arranged at the position behind the vortex generating body for a distance which is 0.05 to 0.35 times length of the inner diameter of the housing. A contact on the contact plate is used for contacting piezoelectric ceramics sealed on an adjusting seat, the electromechanical conversion can be realized, and the flow of liquid, air, and steam can be measured. The utility model has the advantages of strong signals, anti-jamming functions, stable and reliable performance, high measuring accuracy, wide measuring range, etc.
Description
The utility model relates to a kind of sensor that is used for measuring in real time liquid, gas and steam flow.
Present domestic most of flow sensor all is in the housing moving part to be arranged, and as impeller etc., holds impact failure that can't stand complex dielectrics, and when measuring the discharge of sewage, measuring accuracy sharply descends after the fouling, and stops up silt easily, has an accident, and influence is produced.
Vortex flow sensors mostly is vortex generation body stress formula detection modes such as triangular prism, quadrangular prism, trapezoidal column.Though no moving part in the housing, with piezoelectric ceramics, conversion elements such as semiconductor gauge are packed in the vortex generation body.According to Ku Ta-rogowski theory, circulation makes on the cylinder unit length and is subjected to lift, and by strain, stress makes conversion element produce pulse signal and detects.Vortex signal intensity and fluid density and flow velocity square in direct ratio.Like this, at fluid density little (low-pressure gas) and flow hour, a little less than the signal, be subject to hinder and damage, or external condition just can not normally detect when changing slightly.
The purpose of this utility model is to propose a kind of novel flow sensor, and this sensor has higher measurement sensitivity, utilizes differential principle still can provide stronger detection signal when low discharge, and antijamming capability is strong.
The purpose of this utility model is achieved in that square column type vortex generation body 1 fastening perpendicular to sensor housing 11 axis, its fixed form can be welded, be gluedd joint, fastening with securing member, at vortex generation body 1 back (fluid flow direction relatively) tower structure 2 that band force transmission shaft 6 and contact plate 10 are housed separated by a distance, (fixing with methods such as welding, bondings between contact plate 10, force transmission shaft 6 and the tower structure 2), vortex generation body 1 and tower structure 2 standoff distances be tubular shell 11 internal diameters (0.05～0.35) doubly; Contact contact on the contact plate 10 is encapsulated on the piezoelectric ceramics of adjusting in the seat 73 with vibrating membrane.Adjust seat 7 and have slotted hole, adjustable, be fastened on behind the accent on the buckle closure 4.The output terminal of the piezoelectric ceramics 3 metering circuit input end outer with being contained in housing is connected.
Owing to have the gap between vortex generation body 1 and the tower structure 2, serve as the fluid interaction district, when fluid flows through with certain speed, fluid stagnation district of generation in this gap, along with alternately emitting of two row vortexs, the stagnant wake is move left and right thereupon also.As vortex when the left side emits, at the vortex place, speed height and pressure is low, the appearance of this low-pressure area makes the stagnant wake be offset left, causes a large amount of fluids to pour into the right arm of tower structure 2, and it is produced thrust.
In contrast, when the right emitted, the low pressure at vortex place caused the stagnant wake to be offset to the right, makes a large amount of fluids pour into the left arm of tower structure 2 as vortex, and it is produced thrust.Hence one can see that, and when vortex alternately generated, the stagnant wake is move left and right thereupon, makes two arms of tower structure 2 alternately be subjected to the power that springs up of fluid, and its frequency is identical with vortex release frequency.By detecting the frequency of stagnant wake move left and right, perhaps test fluid just can draw the frequency of vortex separation, and draw the average flow velocity of pipeline inner fluid thus the frequency that two arms of tower structure 2 alternately spring up.The said structure form has been arranged, and as shown in Figure 7, tower structure 2 is outstanding shaft type, can swing (pendulum power) slightly, contact shake-up on the contact plate 10 is encapsulated in vibrating membrane on the piezoelectric ceramics of adjusting in the seat 73, produces electric signal, its change frequency is identical with vortex release frequency.The metering circuit input end that the output terminal of piezoelectric ceramics 3 is outer with being contained in housing is connected.So just realized the mechanoelectric conversion of vortex differential type.The utility model adopts detachable structure, as shown in Figure 7, vortex generation body 1 usefulness screw is fastened on the buckle closure 4, locate with pin its lower end, and then be pressed in the housing 11, realization vortex generation body 1 is fastening perpendicular to sensor housing 11 axis, and centre support 8 is fastened on the housing 11, force transmission shaft 6 is packed on the tower structure 2, centre support 8 and force transmission shaft 6 are bearing in respectively in the hole that graphite bearing 5 is housed, become detachable structure after the assembling, make it easy to maintenance, improve machine life.Vortex generation body 1 of the present utility model is made square column type as shown in Figure 1.Band force transmission shaft 6 and the tower structure 2 of contact plate 10 make as shown in Figure 4 outline and in the slotted hole profile be straight line, or up and down the outline of oblique line shown in Fig. 4 double dot dash line, or outline is as shown in Figure 5 made middle wide, narrow up and down circular arc connects shape, or inside and outside contour is all made the shape of circular arc as shown in Figure 6, or interior slotted hole profile still is straight line, and outline is the shape of camber line.The utility model tightens up force transmission shaft 6 on the top of tower structure 2 symcenter, the fastening contact plate 10 on the top of force transmission shaft 6, its contact plate 10 both can have been pointed to backward becomes the vertical tail formula, can point to forward again, promptly 360 ° of any directions all can, more can vertical symmetry fastening in force transmission shaft 6 axis.Adjust seat 7 then, contact is contacted with the piezoelectric ceramics 3 of encapsulation, realize the adjustment clamping mechanoelectric conversion in conversion chamber 9 as shown in Figure 7.
Characteristics of the present utility model are: signal is strong, and is anti-interference, stable and reliable for performance, the measuring accuracy height, and rangeability is big, and lower limit is low especially, and is insensitive to general fouling when measuring the discharge of sewage.
Fig. 1 is a vortex generation body front view in the utility model.
Fig. 2 is that the side view takes place vortex in the utility model.
Fig. 3 analyses and observe the theory structure synoptic diagram for the utility model center rack and panel construction master.
Fig. 4 is the tower structure theory structure synoptic diagram that has force transmission shaft and contact plate for the utility model.
Fig. 5 is a theory structure synoptic diagram wide, narrow up and down in the middle of the utility model center rack and panel construction outline.
Fig. 6 all is theory structure synoptic diagram of circular shape or interior slotted hole profile straight line for the utility model center rack and panel construction inside and outside contour.
Fig. 7 adjusts mechanoelectric conversion's structural representation for the utility model in the conversion chamber.
Embodiment:
Vortex generation body is 1 chromium 18 nickel, 9 titaniums (1Cr18Ni9Ti) material in the utility model, and wide is 0.26 times of sensor internal diameter, and thick is 0.5 times of width, and the width of tower structure will satisfy: and vortex generation body is wide＜and framework is wide＜and 1.6 * vortex generation body is wide.The utility model is is now installed and used on Daqing oil field oil extraction No.1 Factory bilge sounding pipe line.
Claims (7)
1. piezoelectric type vortex difference current quantity sensor, mainly comprise dynamo-electric converter, it is characterized in that: square column type vortex generation body [1] is fastening perpendicular to sensor housing [11] axis, (fluid flow direction relatively) tower structure [2] that band force transmission shaft [6] and contact plate [10] are housed separated by a distance in vortex generation body [1] back, vortex generation body [1] and framed structure [2] standoff distance are 0.05～0.35 times of tubular shell internal diameter, the outline of tower structure [2] and interior slotted hole profile are straight line, or are the outline of oblique line up and down.
2. sensor according to claim 1, it is characterized in that: vortex generation body [1] is fastened on the buckle closure [4] with screw, locate with pin its lower end, and then be pressed in the housing [11], realization vortex generation body [1] is fastening perpendicular to sensor housing [11] axis, and centre support [8] is fastened on the housing [11], force transmission shaft [6] is packed on the tower structure [2], centre support [8] and force transmission shaft [6] are bearing in respectively in the hole that graphite bearing [5] are housed.
3. sensor according to claim 1, it is characterized in that: be encapsulated in the contact of the contact plate [10] on the tower structure [2] on the piezoelectric ceramics of adjusting in the seat [7] [3] with vibrating membrane, adjust seat [7] and have slotted hole, adjustable, be fastened on behind the accent on the buckle closure [4], the output terminal of piezoelectric ceramics [3] the metering circuit input end outer with being contained in housing is connected.
4. sensor according to claim 1, it is characterized in that: the top in tower structure [2] symcenter tightens up force transmission shaft [6], in the fastening contact plate in the top of force transmission shaft [6] [10], its contact plate [10] both can have been pointed to backward becomes the vertical tail formula, can point to forward again, promptly all can at 360 ° of any directions, more can vertical symmetry fastening in force transmission shaft [6] axis, adjust seat [7] then, contact is contacted with the piezoelectric ceramics [3] of encapsulation, be implemented in the adjustment clamping mechanoelectric conversion in the conversion chamber [9].
5. sensor according to claim 1 is characterized in that: tower structure [2] outer contour is wide for the centre, the shape of narrow up and down circular arc line.
6. sensor according to claim 1 is characterized in that: tower structure [2] inside and outside contour is circular shape.
7. sensor according to claim 1 is characterized in that: the interior slotted hole profile of tower structure [2] is a straight line, and outline is the shape of camber line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96203199 CN2257603Y (en) | 1996-06-30 | 1996-06-30 | Piezoelectric swirl differential flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96203199 CN2257603Y (en) | 1996-06-30 | 1996-06-30 | Piezoelectric swirl differential flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2257603Y true CN2257603Y (en) | 1997-07-09 |
Family
ID=33888875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96203199 Expired - Fee Related CN2257603Y (en) | 1996-06-30 | 1996-06-30 | Piezoelectric swirl differential flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2257603Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2156734A2 (en) * | 1998-05-01 | 2010-02-24 | Maasland N.V. | A piezo-sensor |
| CN110987092A (en) * | 2019-12-27 | 2020-04-10 | 东北石油大学 | Multiphase flow vortex shedding flowmeter in pit |
-
1996
- 1996-06-30 CN CN 96203199 patent/CN2257603Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2156734A2 (en) * | 1998-05-01 | 2010-02-24 | Maasland N.V. | A piezo-sensor |
| EP2156734A3 (en) * | 1998-05-01 | 2014-06-25 | Maasland N.V. | A piezo-sensor |
| CN110987092A (en) * | 2019-12-27 | 2020-04-10 | 东北石油大学 | Multiphase flow vortex shedding flowmeter in pit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |