CN109489771A - It is a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment - Google Patents
It is a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment Download PDFInfo
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- CN109489771A CN109489771A CN201811397593.4A CN201811397593A CN109489771A CN 109489771 A CN109489771 A CN 109489771A CN 201811397593 A CN201811397593 A CN 201811397593A CN 109489771 A CN109489771 A CN 109489771A
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- vibrating arm
- piezoelectric ceramics
- inflammable
- high temperature
- copper
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
- G01F23/18—Indicating, recording or alarm devices actuated electrically
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
It is a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, comprising: vibration head, vibrating arm, lead electrode, piezoelectric ceramics, crimping copper sheet, compress copper post, contact conductor, installation pedestal, vibrating arm copper sheathing, support copper post, switching circuit board, housing screw；Compression copper post lower end surface is the smooth flat big with piezoelectric ceramics etc.；It compresses and has internal screw thread inside copper post lower end, cooperate with the screw rod of vibration head rear end face, piezoelectric ceramics is fastened on and is compressed between copper post and vibration head, realize and be fitted close；Lead electrode is located among piezoelectric ceramics；Vibrating arm is cylindrical, hollow straight-bar, and one end is connected in vibration head, and one end is connect with vibrating arm copper sheathing；Vibrating arm and vibration head front end together constitute the external sensing unit of level-sensing device；Installation pedestal is welded on the vibration rod；Crimping copper sheet is tightly attached on vibrating arm internal diameter；Meanwhile a groove is inwardly suppressed, contact conductor is passed through from groove and vibrating arm inner wall.
Description
Technical field
The invention belongs to level switch fields, and in particular to a kind of suitable for high temperature and pressure, the vibration of inflammable and explosive environment
Formula level switch.
Background technique
In industrial production, manufacturing process, it is often necessary to solids such as coal dust, flour, cereal, plastic grain, detergent
The position of particle or liquid is monitored, to control industrial processes.
Oscillatory type level switch is particularly suitable for the solid or liquid position in monitoring and control feed bin or container.Generally
Working principle is as follows: applying periodic voltage signal to piezoelectric ceramics, by inverse piezoelectric effect, piezoelectric ceramics is made to generate vibration
It is dynamic, and vibrating arm is driven to generate resonance；Meanwhile by piezoelectric effect, the amplitude or frequency of resonance are monitored；It shakes when there is material to cover
When lever, resonance, piezoelectric ceramics output voltage or frequency shift are destroyed, to realize the monitoring of material position.
Oscillatory type level-sensing device can also generate resonance since its vibrating arm is connect with process, so that energy loss is brought, and
External vibration can also pass to vibrating arm, influence work.Usual way is to increase by a Duan Fei between vibrating arm and process connection
Metal vibration isolation section.In this way, new problem can be brought again:
Level-sensing device cannot take integrated structure design, can not achieve reliable sealing, cannot use in high temperature and high pressure environment.
It can not achieve flame proof to design, cannot be used in inflammable and explosive equal environment dusty.
The intensity for reducing level-sensing device can not achieve high-intensitive design, is not suitable for, reduces in high-intensitive, strong impact environment
The reliability of level-sensing device.
Driving voltage is very high, and power consumption is larger, is not suitable for using in inflammable and explosive environment.
Summary of the invention
It is an object of the invention to: overcome the deficiencies in the prior art, designing one kind can be used for high temperature and pressure, inflammable and explosive etc.
Environment, high intensity, impact resistance, low-power consumption integration oscillatory type level-sensing device.The level-sensing device is applicable to solid particle and liquid etc.
Various simple and complex working conditions, to meet the requirement of process control and measurement.
Technical scheme is as follows: it is a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment,
Include: vibration head, vibrating arm, lead electrode, piezoelectric ceramics, crimping copper sheet, compress copper post, contact conductor, installation pedestal, vibration
Bar copper sheathing, support copper post, switching circuit board, housing screw；
Compression copper post lower end surface is the smooth flat big with piezoelectric ceramics etc.；It compresses and has internal screw thread inside copper post lower end,
Cooperate with the screw rod of vibration head rear end face, piezoelectric ceramics is fastened on and is compressed between copper post and vibration head, realizes and be fitted close；Draw
Line electrode is located among piezoelectric ceramics；
Vibrating arm is cylindrical, hollow straight-bar, and one end is connected in vibration head, and one end is connect with vibrating arm copper sheathing；Vibrating arm
The external sensing unit of level-sensing device is together constituted with vibration head front end；Installation pedestal is welded on the vibration rod；Crimping copper sheet is close to
On vibrating arm internal diameter；Meanwhile a groove is inwardly suppressed, contact conductor is passed through from groove and vibrating arm inner wall；
Lead wire circuit plate is fixed in installation pedestal by support copper post and housing screw；
Piezoelectric ceramics is thin rounded flakes, middle opening.
It compresses copper post, vibration head, piezoelectric ceramics, lead electrode and collectively forms PZT (piezoelectric transducer), apply week to piezoelectric ceramics
The pumping signal of phase property, piezoelectric ceramic vibration drive entire energy converter starting of oscillation；Then vibrate successively pass to external vibration bar and
Vibrating arm copper sheathing forms resonance, is finally reached stable vibration；
PZT (piezoelectric transducer), vibrating arm, vibrating arm copper sheathing together constitute a whole set of vibrational system；When normal work, generate altogether
Shake simultaneously stable vibration；When having material to cover vibrating arm, damping increases, and destroys resonance, piezoelectric ceramics output reduces, to complete to examine
It surveys.
End face is a word slotted screw form to the compression copper post thereon.
The lead electrode is round copper sheet, and middle opening, there are the via hole and pad for welding lead in edge.
The vibrating arm is cylindrical, hollow straight-bar, and one end is welded in vibration head, and one end is matched with vibrating arm copper sheathing interference
Close connection.
Crimping copper sheet is open circles cylindricality, and outer diameter is greater than vibrating arm internal diameter.
The crimping copper sheet inwardly suppresses the groove of a diameter 1mm.
Disconnection monitoring resistance, and mounting temperature sensor are welded on the lead wire circuit plate.
Compression copper post material is brass.
Vibration head material is 316L.
Remarkable result of the invention is: the level switch based on vibration principle designed by using the present invention solves
The problem of vibrating arm and installation pedestal resonate, realizes integrated flame proof design, and impact resistance is highly reliable；High temperature may be implemented
The solid particle and liquid monitoring material position of the bad working environments such as high pressure, inflammable and explosive, meanwhile, it is also applied for conventional environment.Greatly
Improve the reliability and applicability of sensor.
Detailed description of the invention
It is suitable for high temperature and pressure described in Fig. 1, the oscillatory type level switch of inflammable and explosive environment is weighing sensor schematic diagram；
Fig. 2 is the apparatus for measuring quality schematic diagram of the present invention based on principle of moment balance；
In figure: 1. vibration heads；2. vibrating arm；3. lead electrode；4. piezoelectric ceramics；5. crimping copper sheet；6. compressing copper post；7.
Contact conductor；8. installation pedestal；9. vibrating arm copper sheathing；10. supporting copper post；11. lead wire circuit plate；12. housing screw
Specific embodiment
It is a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, comprising: vibration head 1, vibrating arm 2,
Lead electrode 3, crimping copper sheet 5, compresses copper post 6, contact conductor 7, installation pedestal 8, vibrating arm copper sheathing 9, support at piezoelectric ceramics 4
Copper post 10, switching circuit board 11, housing screw 12；
Compression 6 material of copper post is brass, and end face is a word slotted screw form thereon, with screwdriver fastening convenient to use；
Its lower end surface is the smooth flat big with piezoelectric ceramics 4 etc.；It compresses and has internal screw thread inside 6 lower end of copper post, with 1 rear end of vibration head
The screw rod in face cooperates, and piezoelectric ceramics 4 is fastened on and is compressed between copper post 6 and vibration head 1, realizes and is fitted close；Lead electrode 3 is
Round copper sheet, middle opening are located among piezoelectric ceramics 4, an excitation electrode as piezoelectric ceramics 4.Its edge has
For the via hole and pad of welding lead.Another electrode is itself acted as by metal sensor.
Vibrating arm 2 is cylindrical, hollow straight-bar, and one end is welded in vibration head 1, and one end and vibrating arm copper sheathing 9 are interference fitted
Connection.Vibrating arm 2 and 1 front end of vibration head together constitute the external sensing unit of level-sensing device.Installation pedestal 8 is welded on vibrating arm 2
On；Crimping copper sheet 5 is open circles cylindricality, and outer diameter is slightly larger than 2 internal diameter of vibrating arm, is tightly attached to it on 2 internal diameter of vibrating arm.Meanwhile
Its groove for inwardly suppressing a diameter 1mm, contact conductor 7 pass through from 2 inner wall of groove and vibrating arm, avoid being wound into pressure
Electric transducer causes vibration of breaking or destroy.
Lead wire circuit plate 11 is fixed in installation pedestal 8 by support copper post 10 and housing screw 12, realizes lead switching
Function.Meanwhile it being welded with disconnection monitoring resistance on it.In addition, can also mounting temperature sensor as needed, realize temperature prison
Brake.
1 material of vibration head is 316L, and front end is smooth arc-shaped surface, reduces material bonding.Rear end undergauge is convenient for saving energy
Starting of oscillation.
Piezoelectric ceramics 4 is thin rounded flakes, middle opening.Piezoelectric ceramics 4 functions simultaneously as driving element and detecting element, reduces
Piezoelectric ceramics quantity.By inverse piezoelectric effect, vibration component is driven to form resonance；By piezoelectric effect, electricity is converted by vibration
Signal output, realizes vibration monitoring.
It compresses copper post 6, vibration head 1, piezoelectric ceramics 4, lead electrode 3 and collectively forms PZT (piezoelectric transducer), applied to piezoelectric ceramics 4
Add periodic pumping signal, due to inverse piezoelectric effect, piezoelectric ceramics 4 vibrates, and drives entire energy converter starting of oscillation.Then vibrate according to
It is secondary to pass to external vibration bar 2 and vibrating arm copper sheathing 9, resonance is formed, stable vibration is finally reached.
PZT (piezoelectric transducer), vibrating arm 2, vibrating arm copper sheathing 9 together constitute a whole set of vibrational system.When normal work, generate
Resonate simultaneously stable vibration；When having material to cover vibrating arm, damping increases, and destroys resonance, piezoelectric ceramics output reduces, to complete
Detection.And since installation pedestal 8 is welded on vibrating arm 2, so that installation pedestal 8 is not followed by system vibration, solve
The problem of resonance, realizes integrated high-intensitive flame proof design to eliminate nonmetallic vibration isolation section.
Transducing unit is that piezoelectric ceramics 4 provides periodic activation signals.Meanwhile the electric signal for exporting piezoelectric ceramics 4 turns
Become standard signal output.Transducing unit realizes modularized design, can be changed quickly.
The level-sensing device course of work are as follows: periodic pumping signal, piezoelectric ceramics are applied to piezoelectric ceramics 4 by transducing unit
4 drive PZT (piezoelectric transducer) starting of oscillation；Vibration passes to vibrating arm 2 and vibrating arm copper sheathing 9, and whole system realizes resonance, generates stabilization
Vibration.Piezoelectric ceramics 4 exports stable voltage magnitude by piezoelectric effect monitoring vibration.When external material covers 1 He of vibration head
When vibrating arm 2, resonance is destroyed, amplitude reduces, and output voltage reduces, and transducing unit detects that this changes and to be converted into standard signal defeated
Out, to complete the real time monitoring of material position.When external material is eliminated, resonance restores.
Claims (10)
1. a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is characterised in that: include: vibration head
(1), vibrating arm (2), lead electrode (3), piezoelectric ceramics (4), crimping copper sheet (5), compression copper post (6), contact conductor (7), peace
Fill pedestal (8), vibrating arm copper sheathing (9), support copper post (10), switching circuit board (11), housing screw (12)；
Compressing copper post (6) lower end surface is and the big smooth flats such as piezoelectric ceramics (4)；It compresses inside copper post (6) lower end with interior
Screw thread cooperates with the screw rod of vibration head (1) rear end face, piezoelectric ceramics (4) is fastened on compress copper post (6) and vibration head (1) it
Between, it realizes and is fitted close；It is intermediate that lead electrode (3) is located at piezoelectric ceramics (4)；
Vibrating arm (2) is cylindrical, hollow straight-bar, and one end is connected on vibration head (1), and one end is connect with vibrating arm copper sheathing (9)；
Vibrating arm (2) and vibration head (1) front end together constitute the external sensing unit of level-sensing device；Installation pedestal (8) is welded on vibrating arm
(2) on；Crimping copper sheet (5) is tightly attached on vibrating arm (2) internal diameter；Meanwhile inwardly suppress a groove, contact conductor (7) from
It is passed through in groove and vibrating arm (2) inner wall；
Lead wire circuit plate (11) is fixed on installation pedestal (8) by support copper post (10) and housing screw (12)；
Piezoelectric ceramics (4) is thin rounded flakes, middle opening.
2. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: compression copper post (6), vibration head (1), piezoelectric ceramics (4), lead electrode (3) collectively form PZT (piezoelectric transducer), give piezoelectricity
Ceramic (4) apply periodic pumping signal, and piezoelectric ceramics (4) vibration drives entire energy converter starting of oscillation；Then it vibrates and successively passes
External vibration bar (2) and vibrating arm copper sheathing (9) are passed, resonance is formed, is finally reached stable vibration；
PZT (piezoelectric transducer), vibrating arm (2), vibrating arm copper sheathing (9) together constitute a whole set of vibrational system；When normal work, generate
Resonate simultaneously stable vibration；When having material to cover vibrating arm, damping increases, and destroys resonance, piezoelectric ceramics output reduces, to complete
Detection.
3. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: end face is a word slotted screw form to the compression copper post (6) thereon.
4. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: the lead electrode (3) is round copper sheet, and middle opening, there are the via hole and pad for welding lead in edge.
5. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: the vibrating arm (2) is cylindrical, hollow straight-bar, and one end is welded on vibration head (1), one end and vibrating arm copper sheathing
(9) interference fit connection.
6. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: crimping copper sheet (5) is open circles cylindricality, and outer diameter is greater than vibrating arm (2) internal diameter.
7. it is according to claim 6 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: the crimping copper sheet (5) inwardly suppresses the groove of a diameter 1mm.
8. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: being welded with disconnection monitoring resistance, and mounting temperature sensor on the lead wire circuit plate (11).
9. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment, it is special
Sign is: compression copper post (6) material is brass.
10. it is according to claim 1 a kind of suitable for high temperature and pressure, the oscillatory type level switch of inflammable and explosive environment,
Be characterized in that: vibration head (1) material is 316L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811397593.4A CN109489771B (en) | 2018-11-22 | 2018-11-22 | Vibrating material level switch suitable for high-temperature high-pressure, inflammable and explosive environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811397593.4A CN109489771B (en) | 2018-11-22 | 2018-11-22 | Vibrating material level switch suitable for high-temperature high-pressure, inflammable and explosive environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109489771A true CN109489771A (en) | 2019-03-19 |
| CN109489771B CN109489771B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811397593.4A Active CN109489771B (en) | 2018-11-22 | 2018-11-22 | Vibrating material level switch suitable for high-temperature high-pressure, inflammable and explosive environment |
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Citations (7)
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|---|---|---|---|---|
| US5247832A (en) * | 1991-02-14 | 1993-09-28 | Nohken Inc. | Vibrator-type level sensor |
| US6272921B1 (en) * | 1997-09-15 | 2001-08-14 | Balin Nikolai Ivanovich | Ultrasound sensor for detecting the level of liquids |
| CN1439093A (en) * | 2000-05-15 | 2003-08-27 | Vega格里沙贝两合公司 | Piezoelectrically excited oscillating element |
| CN201417166Y (en) * | 2009-03-23 | 2010-03-03 | 上海凡宜科技电子有限公司 | Ultra-high temperature tuning fork level switch |
| CN202092723U (en) * | 2011-05-19 | 2011-12-28 | 唐锟 | High-temperature resistant piezoelectric ceramic transducer sensor |
| CN205262544U (en) * | 2015-11-23 | 2016-05-25 | 艾默生(北京)仪表有限公司 | Tuning fork level meter |
| CN106840309A (en) * | 2017-04-01 | 2017-06-13 | 伊玛精密电子（苏州）有限公司 | Intelligent miniature tuning fork type level meter |
-
2018
- 2018-11-22 CN CN201811397593.4A patent/CN109489771B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247832A (en) * | 1991-02-14 | 1993-09-28 | Nohken Inc. | Vibrator-type level sensor |
| US6272921B1 (en) * | 1997-09-15 | 2001-08-14 | Balin Nikolai Ivanovich | Ultrasound sensor for detecting the level of liquids |
| CN1439093A (en) * | 2000-05-15 | 2003-08-27 | Vega格里沙贝两合公司 | Piezoelectrically excited oscillating element |
| CN201417166Y (en) * | 2009-03-23 | 2010-03-03 | 上海凡宜科技电子有限公司 | Ultra-high temperature tuning fork level switch |
| CN202092723U (en) * | 2011-05-19 | 2011-12-28 | 唐锟 | High-temperature resistant piezoelectric ceramic transducer sensor |
| CN205262544U (en) * | 2015-11-23 | 2016-05-25 | 艾默生(北京)仪表有限公司 | Tuning fork level meter |
| CN106840309A (en) * | 2017-04-01 | 2017-06-13 | 伊玛精密电子（苏州）有限公司 | Intelligent miniature tuning fork type level meter |
Non-Patent Citations (1)
| Title |
|---|
| 曹恒 等: ""振动式料位计固有频率分析及测试方法"", 《仪表技术与传感器》 * |
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