CN103217194B - A kind of combination type sensing element - Google Patents

A kind of combination type sensing element Download PDF

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Publication number
CN103217194B
CN103217194B CN201310128020.2A CN201310128020A CN103217194B CN 103217194 B CN103217194 B CN 103217194B CN 201310128020 A CN201310128020 A CN 201310128020A CN 103217194 B CN103217194 B CN 103217194B
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signal
sensing element
combination type
plate
piezoelectric crystal
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CN103217194A (en
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姚贤卿
范英才
姚宁
柏凯译
郭长顺
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Abstract

The present invention relates to a kind of combination type sensing element, described sensing element is combination type piezoelectric crystal plate, it is arranged with two pairs of electrodes plate on the upper and lower end flat of potsherd therein, the polarity of two battery lead plates on same plane is identical, positive-negative electrode plate staggered cross in upper and lower two planes couples, and connects a signal lead the most respectively.Present invention sensing has had new innovation in electricity principle, as under same flow velocity or same purpose power, the signal amplitude that combination type piezoelectric crystal plate is detected is more than 0.15mv, it it is 35 times of prior art, the performance of the minimum discharge measured has striden forward major step, range ratio is brought up to 30:1~60:1 by 10:1~20:1, and signal to noise ratio there has also been and is obviously improved simultaneously, and interference free performance is greatly enhanced.It is simple and reasonable, volume is little, function admirable, shock resistance are good, is not disturbed by earth-current and electromagnetic field, is suitable for encapsulate within the probe of various types of detection vortex signal, can not arrhea maintenance and be convenient for changing.

Description

A kind of combination type sensing element
Technical field
The present invention relates to the measurement device of a kind of fluids within pipes flow, specifically a kind of combination type sensing element.Can be used for detecting the vortex signal of flow or the vibration force of vibration rig and frequency signal.
Background technology
It is known that the birth of the First vortex-shedding meter seventies in last century, causing a sensation world's flow industry, US Experts prophesy can replace the throttling arrangement having widely applied upper a century in the near future.In decades, various countries scientist, flow industry scientific and technical personnel, users scientific research, produce, apply in experienced by unremitting effort, in succession occur in that the vortex-shedding meter that the principles such as critesistor, piezoquartz, differential capacitor, ultrasound wave and device manufacture, owing to the sensor of the vortex-shedding meter of its core component detection flow signal can not realize not arrheaing replacing maintenance sensor online mostly.Arrheaing maintenance and mean that production line to stop production, stopping production is one in modern production and avoids greatly, as petrochemical plant stop production one hour it is possible to lose unit up to a million, the most, heating network not only affects production, also will affect the orthobiosis of the common people.Therefore users extremely expect function admirable, install and convenient online removable effusion meter.
The problem that current online removable vortex-shedding meter exists is mainly reflected in: (1) structure design existing defects: as Patent No. 01205954.4 all uses its common ground of connected structure to be that the vibrating arm of the probe that will be equipped with detecting element is plugged on another similar metal vibration bar or elastomer and the grafting of support chamber with Patent No. 101979964A, their shortcoming is to manufacture complexity, processing and assembling difficulty are big, it is difficult to produce in batches, particularly its contact point is easily generated vibration noise, contact also easy fatigue follows the string, the problems such as even more serious in high temperature, this connected structure affects the transmission of swirling action power, shock resistance is very poor, therefore signal to noise ratio is poor, cannot normally work time serious, it is more difficult to measure low discharge.The quality of signal to noise ratio is to directly affect the important indicator that flowmeter performance is good and bad.(2) detecting element piezoquartz electricity principle and structure existing defects: be piezoquartz to be encapsulated in probing shell or fastens sealing be integrally forming in probing shell mostly.China Patent No. is 01261173.5, its garden sheet shape piezoquartz uses end face battery lead plate to be the bottom surface being close to probe metal shell, i.e. connect together with the earth and drawn signal lead by casing or briquetting, other end battery lead plate insulate with probe metal shell and draws another signal lead, this signal lead, due to not unsettled with the earth, is easily affected by grounding current EMI.Above-mentioned piezoquartz electricity principle is parallel way, signal is more weak, poor signal to noise, when there being mechanical vibration, meeting superpositing vibration signal on flow signal, when vibration signal is more than flow meter signal there is strange change in flow signal, cause leaky wave or increase ripple, it is very big that this results in measuring result error, cannot normally work time serious, and blank pipe when flowing without fluid is all the more so.Signal to noise ratio is to weigh the performance indications that an effusion meter is important.Due to poor signal to noise, when flow is less, signal is the most weak can not be detected, measureable minimum flow, and the most lower limit flow, is the another important performance indexes weighing an effusion meter.Patent No. 201120029273.0, because sensing element piezoquartz wafer is fastened in probing shell, it is difficult to control the clamp nut pressure to sensing element piezoquartz wafer, the most improper will crushing by sensing element piezoquartz wafer is damaged, and additionally sensing element piezoquartz wafer is bad with the note conjunction of probe baseplane and pressurized inequality all can cause sensing element piezoquartz wafer fragmentation to damage.This sensing element piezoquartz there is also defect in the polarised direction and electricity principle of battery lead plate.
Summary of the invention
The technical problem to be solved is to overcome above-mentioned the deficiencies in the prior art, offer one is simple and reasonable, volume is little, function admirable, shock resistance are good, do not disturbed by earth-current and electromagnetic field, use and install and maintenance simplicity, and the combination type sensing element being convenient for changing.
The present invention solves above-mentioned technical problem and the technical scheme is that a kind of combination type sensing element, it is characterized in that: described sensing element is combination type piezoelectric crystal plate, the upper and lower end flat of potsherd therein is provided with two pairs of electrodes plate, the polarity of two battery lead plates on same plane is identical, positive-negative electrode plate staggered cross in upper and lower two planes couples, and connects a signal lead the most respectively.
Signal lead perforation it is provided with in the middle of described potsherd.
Combination type sensing element of the present invention can also be made up of two piezoelectric crystal plates, on two piezoelectric crystal plates, the polarity of the battery lead plate of the same side is identical, the positive electrical pole plate of one piezoelectric crystal plate couples with the negative el staggered cross of another piezoelectric crystal plate, connects a signal lead the most respectively.
Positive-negative electrode plate staggered cross connecting mode in upper and lower two planes of sensing element of the present invention, electricity principle there is new innovation, the signal amplitude measured is significantly larger than prior art, as under same flow velocity or same purpose power, the signal amplitude that combination type piezoelectric crystal plate is detected is more than 0.15mv, it it is 3-5 times of prior art, the performance of the minimum discharge measured has striden forward major step, range ratio is brought up to 30:1~60:1 by 10:1~20:1, signal to noise ratio there has also been and is obviously improved simultaneously, and interference free performance is greatly enhanced.Against existing technologies, present configuration advantages of simple, volume are little, function admirable, shock resistance are good, are not disturbed by earth-current and electromagnetic field, use and install and maintenance simplicity.The present invention is suitable for encapsulate within the probe of various types of detection vortex signal, can not arrhea maintenance and be convenient for changing.It is arranged on the pipeline table body of vortex-shedding meter just can form and a kind of does not arrhea removable vicarious vortex-shedding meter online.
Accompanying drawing explanation
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is sensing element structure and electricity principle diagram.
Label in figure is: 1. potsherd, 2. battery lead plate, 3. signal lead, 4. signal lead perforation.
Detailed description of the invention
As can be seen from Figure 1, a kind of combination type sensing element, it is characterized in that: described sensing element is combination type piezoelectric crystal plate, it is arranged with two pairs of electrodes plate 2 on potsherd about 1 end flat therein, the polarity of two battery lead plates 2 on same plane is identical, positive-negative electrode plate staggered cross in upper and lower two planes couples, and connects a signal lead 3 the most respectively.
Signal lead perforation 4 it is provided with in the middle of described potsherd 1.
Combination type sensing element of the present invention can also be made up of two piezoelectric crystal plates, on two piezoelectric crystal plates, the polarity of the battery lead plate 2 of the same side is identical, the positive electrical pole plate of one piezoelectric crystal plate couples with the negative el staggered cross of another piezoelectric crystal plate, connects a signal lead 3 the most respectively.
Positive-negative electrode plate 2 staggered cross connecting mode in upper and lower two planes of sensing element of the present invention, electricity principle there is new innovation, the signal amplitude measured is significantly larger than prior art, as under same flow velocity or same purpose power, the signal amplitude that combination type piezoelectric crystal plate is detected is more than 0.15mv, it it is 3-5 times of prior art, the performance of the minimum discharge measured has striden forward major step, range ratio is brought up to 30:1~60:1 by 10:1~20:1, signal to noise ratio there has also been and is obviously improved simultaneously, and interference free performance is greatly enhanced.
Present configuration advantages of simple, volume are little, function admirable, shock resistance are good, are not disturbed by earth-current and electromagnetic field, use and install and maintenance simplicity.The present invention is suitable for encapsulate within the probe of various types of detection vortex signal, can not arrhea maintenance and be convenient for changing.It is arranged on the pipeline table body of vortex-shedding meter just can form and a kind of does not arrhea removable vicarious vortex-shedding meter online.

Claims (2)

1. a combination type sensing element, it is characterized in that: described sensing element is combination type piezoelectric crystal plate, the upper and lower end flat of potsherd therein is provided with two pairs of electrodes plate, the polarity of two battery lead plates on same plane is identical, positive-negative electrode plate staggered cross in upper and lower two planes couples, and connects a signal lead the most respectively;Signal lead perforation it is provided with in the middle of described potsherd.
2. a combination type sensing element, it is characterized in that: it is made up of two piezoelectric crystal plates, on two piezoelectric crystal plates, the polarity of the battery lead plate of the same side is identical, the positive electrical pole plate of one piezoelectric crystal plate couples with the negative el staggered cross of another piezoelectric crystal plate, connects a signal lead the most respectively.
CN201310128020.2A 2013-04-15 2013-04-15 A kind of combination type sensing element Active CN103217194B (en)

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CN103217194B true CN103217194B (en) 2016-07-27

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4910994A (en) * 1989-01-13 1990-03-27 Lew Hyok S Impulse sensor with calibration means
US6298734B1 (en) * 1999-03-17 2001-10-09 Vortek Instruments Llc Rocker style sensor system for use in a vortex shedding flowmeter
CN2526812Y (en) * 2002-03-08 2002-12-18 欧阳汉良 Piezoelectric crystal sensor
CN203177903U (en) * 2013-04-15 2013-09-04 柏凯译 Combined type sensing element

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05118889A (en) * 1991-10-28 1993-05-14 Yokogawa Electric Corp Vortex flowmeter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4910994A (en) * 1989-01-13 1990-03-27 Lew Hyok S Impulse sensor with calibration means
US6298734B1 (en) * 1999-03-17 2001-10-09 Vortek Instruments Llc Rocker style sensor system for use in a vortex shedding flowmeter
CN2526812Y (en) * 2002-03-08 2002-12-18 欧阳汉良 Piezoelectric crystal sensor
CN203177903U (en) * 2013-04-15 2013-09-04 柏凯译 Combined type sensing element

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