CN203177903U - Combined type sensing element - Google Patents
Combined type sensing element Download PDFInfo
- Publication number
- CN203177903U CN203177903U CN 201320185567 CN201320185567U CN203177903U CN 203177903 U CN203177903 U CN 203177903U CN 201320185567 CN201320185567 CN 201320185567 CN 201320185567 U CN201320185567 U CN 201320185567U CN 203177903 U CN203177903 U CN 203177903U
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- sensing element
- combined type
- piezoelectric crystal
- signal
- electrode plates
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Abstract
The utility model relates to a combined type sensing element which is a combined type piezoelectric crystal piece. Two pairs of electrode plates are symmetrically arranged on the upper end plane and the lower end plane of a ceramic piece, the polarity of the two electrode plates on the same plane is identical, positive electrode plates and negative electrode plates on the upper plane and the lower plane are connected in a staggering and crossing mode and then connected with a signal wire respectively. The sensing element is innovated on the basis of the electric principle, the signal amplitude detected by the combined piezoelectric crystal piece is larger than 0.15mv and is 3-5 times as large as that in the prior art under identical flow speed or identical action force, minimum flow measuring performance is greatly improved, the range rate is increased from 10:1-20:1 to 30:1-60:1, meanwhile the signal to noise ratio is obviously improved, and anti-jamming performance is greatly improved. The combined type sensing element is simple and reasonable in structure, small in size, good in performance, good in vibration resistance, free of interference of ground current and electromagnetic fields, suitable to be packaged in various types of probes for detecting vortex signals, capable of conducting non-flow-stop overhauling and convenient to replace.
Description
Technical field
The utility model relates to a kind of measuring element of pipeline inner fluid flow, specifically a kind of combined type sensing element.Can be used for detecting the vortex signal of flow or vibration force and the frequency signal of vibration test machine.
Background technology
We know, the seventies in last century first vortex shedding flow meter birth, cause a sensation world's flow industry, U.S. expert prophesy can replace the restriction device of having widely applied last a century in the near future.In decades, the various countries scientist, flow industry scientific and technical personnel, users have experienced unremitting effort in scientific research, production, application, occurred the vortex shedding flow meter that principle such as thermistor, piezoelectric crystal, differential capacitor, ultrasound wave and device are made in succession, can not be implemented in line mostly and do not arrhea and change the maintenance sensor because its core component detects the sensor of the vortex shedding flow meter of flow signal.Arrhea maintenance and mean that production line will stop production, stopping production is that in the modern production avoids greatly, stops production one hour with regard to possible loss units up to a million as petrochemical plant, even more, and heating network not only influences production, also will influence the common people's normal life.Therefore users very expect function admirable, install and online removable flowmeter easily.
At present the problem that exists of online removable vortex shedding flow meter is mainly reflected in: there is defective in (1) structural design: as the patent No. be 01205954.4 and the patent No. be that all to adopt its common ground of connected structure be that the vibrating arm that will the probe of detecting element be housed is plugged on another similar metal vibrating arm or elastic body and support chamber grafting to 101979964A, their shortcoming is to manufacture complexity, processing and assembling difficulty are big, be difficult to produce in batches, particularly its contact point easily produces vibration noise, contact also easy fatigue follows the string, problems such as even more serious in the high temperature, this connected structure influences the transmission of swirling action power, the anti-vibration performance is very poor, therefore signal to noise ratio (S/N ratio) is relatively poor, can't operate as normal when serious, more be difficult to measure low discharge.The quality of signal to noise ratio (S/N ratio) is the important indicator that directly influences the flowmeter performance quality.(2) there are defective in detecting element piezoelectric crystal electricity principle and structure: be to be encapsulated in piezoelectric crystal in the probing shell or fastening sealing becomes one in probing shell mostly.China Patent No. is 01261173.5, it is the bottom surface that is close to the probe metal shell that its garden sheet shape piezoelectric crystal adopts an end electrode plate, namely connect together with the earth and draw signal lead by casing or briquetting, the other end battery lead plate is with the insulation of probe metal shell and draw another signal lead, the sort signal lead-in wire is subject to the influence that vagabond current disturbs owing to not unsettled with the earth.Above-mentioned piezoelectric crystal electricity principle is parallel way, signal a little less than, poor signal to noise, when mechanical vibration, can superpositing vibration on the flow signal signal, when vibration signal during greater than flow meter signal flow signal strange the change taken place, cause leaky wave or increase ripple, this just causes measuring result error very big, can't operate as normal when serious, and the blank pipe when no fluid is mobile is all the more so.Signal to noise ratio (S/N ratio) is to weigh the performance index that flowmeter is important.Because poor signal to noise, the flow too weak detection of hour signal do not come out, and can survey minimum flow, claim the lower limit flow yet, are the another important performance indexes of weighing a flowmeter.The patent No. is 201120029273.0, because sensing element piezoelectric crystal wafer is fastened in the probing shell, be difficult to control gland nut to the pressure of sensing element piezoelectric crystal wafer, the improper crushing of sensing element piezoelectric crystal wafer will the damage arranged slightly, and sensing element piezoelectric crystal wafer closes bad with probe baseplane card in addition and the pressurized inequality all can cause the cracked damage of sensing element piezoelectric crystal wafer.Also there is defective in this sensing element piezoelectric crystal on the polarised direction of battery lead plate and electric principle.
Summary of the invention
Technical problem to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of simple and reasonable, volume is little, function admirable, anti-vibration performance are good, be not subjected to the interference of vagabond current and electromagnetic field, use is installed and keeps in repair easy, and the combined type sensing element that is convenient for changing.
The technical scheme in the invention for solving the above technical problem is:
A kind of combined type sensing element, it is characterized in that: described sensing element is the combined type piezoelectric crystal plate, potsherd wherein end flat up and down is provided with two pairs of battery lead plates, the polarity of two battery lead plates on the same plane is identical, positive-negative electrode plate on two planes dislocation X-bracing then connects a signal lead respectively up and down.
Be provided with the signal lead perforation in the middle of the described potsherd.
The utility model combined type sensing element can also be made up of two piezoelectric crystal plates, the polarity of the battery lead plate of the same side is identical on two piezoelectric crystal plates, the anode electrode plate of a piezoelectric crystal plate and the negative el of another piezoelectric crystal plate dislocation X-bracing then connect a signal lead respectively.
The utility model sensing element is the positive-negative electrode plate dislocation X-bracing mode on two planes up and down, in electric principle new innovation has been arranged, the signal amplitude of measuring is higher than prior art far away, as under same flow velocity or same purpose power, the signal amplitude that the combined type piezoelectric crystal plate detects is greater than 0.15mv, be the 3-5 of prior art doubly, the performance of the minimum flow of measuring has striden forward major step, range ratio is brought up to 30:1～60:1 by 10:1～20:1, signal to noise ratio (S/N ratio) has also had obvious improvement simultaneously, and interference free performance also improves a lot.Against existing technologies, the utility model is simple and reasonable, volume is little, function admirable, anti-vibration performance are good, is not subjected to the interference of vagabond current and electromagnetic field, uses to install and keep in repair easy.The utility model is suitable for being encapsulated in the probe of various types of detection vortex signals, can not arrhea to overhaul and be convenient for changing.Be installed on the pipeline table body of vortex shedding flow meter and just can form a kind of online removable induction type vortex shedding flow meter that do not arrhea.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is sensing element structure and electric principle diagram.
Label among the figure is: 1. potsherd, 2. battery lead plate, 3. signal lead, 4. signal lead perforation.
Embodiment
As can be seen from Figure 1, a kind of combined type sensing element, it is characterized in that: described sensing element is the combined type piezoelectric crystal plate, potsherd wherein is arranged with two pairs of battery lead plates 2 on the end flat about in the of 1, the polarity of two battery lead plates 2 on the same plane is identical, positive-negative electrode plate on two planes dislocation X-bracing then connects a signal lead 3 respectively up and down.
Be provided with signal lead perforation 4 in the middle of the described potsherd 1.
The utility model combined type sensing element can also be made up of two piezoelectric crystal plates, the polarity of the battery lead plate 2 of the same side is identical on two piezoelectric crystal plates, the anode electrode plate of a piezoelectric crystal plate and the negative el of another piezoelectric crystal plate dislocation X-bracing then connect a signal lead 3 respectively.
The utility model sensing element is the positive-negative electrode plate 2 dislocation X-bracing modes on two planes up and down, in electric principle new innovation has been arranged, the signal amplitude of measuring is higher than prior art far away, as under same flow velocity or same purpose power, the signal amplitude that the combined type piezoelectric crystal plate detects is greater than 0.15mv, be the 3-5 of prior art doubly, the performance of the minimum flow of measuring has striden forward major step, range ratio is brought up to 30:1～60:1 by 10:1～20:1, signal to noise ratio (S/N ratio) has also had obvious improvement simultaneously, and interference free performance also improves a lot.
The utility model is simple and reasonable, volume is little, function admirable, anti-vibration performance are good, is not subjected to the interference of vagabond current and electromagnetic field, uses to install and keep in repair easy.The utility model is suitable for being encapsulated in the probe of various types of detection vortex signals, can not arrhea to overhaul and be convenient for changing.Be installed on the pipeline table body of vortex shedding flow meter and just can form a kind of online removable induction type vortex shedding flow meter that do not arrhea.
Claims (3)
1. combined type sensing element, it is characterized in that: described sensing element is the combined type piezoelectric crystal plate, potsherd wherein end flat up and down is provided with two pairs of battery lead plates, the polarity of two battery lead plates on the same plane is identical, positive-negative electrode plate on two planes dislocation X-bracing then connects a signal lead respectively up and down.
2. according to the described combined type sensing element of claim 1, it is characterized in that: be provided with the signal lead perforation in the middle of the described potsherd.
3. combined type sensing element, it is characterized in that: it is made up of two piezoelectric crystal plates, the polarity of the battery lead plate of the same side is identical on two piezoelectric crystal plates, the anode electrode plate of a piezoelectric crystal plate and the negative el of another piezoelectric crystal plate dislocation X-bracing then connect a signal lead respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320185567 CN203177903U (en) | 2013-04-15 | 2013-04-15 | Combined type sensing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320185567 CN203177903U (en) | 2013-04-15 | 2013-04-15 | Combined type sensing element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203177903U true CN203177903U (en) | 2013-09-04 |
Family
ID=49074586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320185567 Expired - Lifetime CN203177903U (en) | 2013-04-15 | 2013-04-15 | Combined type sensing element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203177903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217194A (en) * | 2013-04-15 | 2013-07-24 | 柏凯译 | Combined type sensing element |
-
2013
- 2013-04-15 CN CN 201320185567 patent/CN203177903U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217194A (en) * | 2013-04-15 | 2013-07-24 | 柏凯译 | Combined type sensing element |
| CN103217194B (en) * | 2013-04-15 | 2016-07-27 | 柏凯译 | A kind of combination type sensing element |
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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 |
Granted publication date: 20130904 Effective date of abandoning: 20160727 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |