CN105547416A - Magnetostriction liquid level sensor - Google Patents
Magnetostriction liquid level sensor Download PDFInfo
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- CN105547416A CN105547416A CN201610079593.4A CN201610079593A CN105547416A CN 105547416 A CN105547416 A CN 105547416A CN 201610079593 A CN201610079593 A CN 201610079593A CN 105547416 A CN105547416 A CN 105547416A
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- 239000007788 liquid Substances 0.000 title claims abstract description 32
- 238000007667 floating Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims description 15
- 238000013016 damping Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 10
- 230000005855 radiation Effects 0.000 description 6
- 230000005672 electromagnetic field Effects 0.000 description 5
- 230000036039 immunity Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000037361 pathway Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000807 Ga alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
Classifications
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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
- G01F23/30—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 floats
- G01F23/64—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 floats of the free float type without mechanical transmission elements
- G01F23/72—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 floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
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- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a magnetostriction liquid level sensor which comprises a sensor head, a measuring rod and a floating ball assembly. The measuring rod is fixedly connected with the sensor head. The floating ball assembly is installed on the measuring rod and can freely move along a shell of the measuring rod. The sensor head internally comprises a fixed base, a measuring circuit module, an outer shielding case and a coil shielding case. The measuring circuit module comprises a coil, a measuring circuit board and a return wire. The measuring circuit board is installed on the fixed base. The coil is installed on the measuring circuit board. The coil shielding case covers the coil to shield the coil. The outer shielding case is installed on the fixed base, and covers the measuring circuit board and the coil to shield the measuring circuit module. The magnetostriction liquid level sensor is high in space utilization rate and capable of effectively reducing noise and influences of electromagnetic interference, and has the advantages of being high in anti-interference capability, high in measuring precision and the like.
Description
Technical field
The present invention relates to sensor technical field, be specifically related to a kind of magnetostrictive liquid level sensor that can normally work under strong electromagnetic interference environment.
Background technology
Magnetostrictive liquid level sensor utilizes the Wiedemann effectiveness of magnetostriction materials, intersected the instrument that generation strain-pulse signal comes measuring position exactly by two different magnetic fields.It measures what carry out is the non-cpntact measurement of absolute position, and have range large, precision is high, high reliability, is widely used in various position measurement.
But the generation due to magnetostrictive liquid level sensor signal is the magnetic field produced based on current impulse; the collection of signal adopts coil class perceptual device; these Sensitive Apparatuses or magnetic field are easily subject to the impact of various interference, when especially using under the electromagnetic environment of complexity, as fast-pulse group; conduction; radiation, electrostatic, during the interference such as surge voltage and surge current; output of products is beated very large, exceedes accuracy rating; Or output distortion; Time serious, the complete cisco unity malfunction of product, even damages.
Publication number is that the Chinese invention patent application of CN103837211A discloses a kind of magnetostrictive liquid level sensor based on Fe-Ga material.The composition of this sensor comprises sensor head, sounding rod and float, and wherein, sensor head is threaded connection and is connected with sounding rod, and movable float is enclosed within the bottom of sounding rod; Sensor head is cylinder-like structure, and inside comprises ware circuit, pick-up unit and front damping unit; Waveguide filament is Fe-Ga material, inner at sounding rod; Waveguide filament front end enters sensor head by threaded hole, successively through the center of the coil rack in pick-up unit and front damping unit, is directly connected into ware circuit; Waveguide filament end is connected with return conductor through the center of rear damping unit, and return conductor takes back hardware circuit, forms closed loop.It adopts Fe-Ga alloy as the waveguide filament material of magnetostrictive liquid level sensor, can be applied in the liquid level sensor of wide range, can under more severe noisy environment steady operation.But because it lacks Antijamming protecting method under complex electromagnetic environment, there is following shortcoming:
(1) described coil is easily by the impact of strong electromagnetic, causes the collection distortion of coil pulse signals, and signal exports abnormal, measures inaccurate;
(2) described product is under the working conditions such as stronger surge voltage and surge current, and product lacks protection circuit, easily causes damaging;
(3) product electrical fast transient (eft) and radio frequency electromagnetic field induction conduction working environment under, output signal saltus step, cisco unity malfunction;
In sum, although existing magnetostrictive liquid level sensor by structure and circuit when conventional noise, achieve certain achievement.When but product is under strong electromagnetic interference environment, can not normal work as in normal circumstances.
Therefore, if a kind of magnetostrictive high precision liquid level sensor that can be applicable under strong electromagnetic interference environment can be developed; Also normally can work under strong electromagnetic interference environment, then will have market outlook.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the object of this invention is to provide a kind of magnetostrictive liquid level sensor that can be applicable under strong electromagnetic interference environment.Its three elements according to electromagnetic interference (EMI) " electromagnetic disturbance source, coupling path or propagation ducts, sensitive equipment " set out, and see clearly that harassing and wrecking source object is on the impact of circuit function unit; Cut off propagation ducts and coupling path; Shielding protection is carried out to Sensitive Apparatus, thus realizes the present invention also can realize normal work under strong electromagnetic interference environment.The impact that this magnetostrictive liquid level sensor space availability ratio is high, effectively can reduce noise and electromagnetic interference (EMI), has that antijamming capability is strong, measuring accuracy advantages of higher.
For solving problems of the prior art, the concrete technical scheme of employing is:
A kind of magnetostrictive liquid level sensor, comprises sensor head, sounding rod and floating ball component; Described sounding rod is fixedly connected with described sensor head, and described floating ball component is arranged on described sounding rod, and described floating ball component can move freely along described sounding rod shell; It is characterized in that: comprise holder, metering circuit assembly, external shield and coil radome in described sensor head, described metering circuit assembly comprises coil, metering circuit plate and loop line; Described metering circuit plate is arranged on holder, and described coil is arranged on metering circuit plate; Coil is stated in described coil radome residence, realizes shielding to coil; Described external shield is arranged on holder, covers described metering circuit plate and described coil, realizes shielding to described metering circuit assembly; Described sounding rod comprises the outer pillar of metal, insulation inner protective tube, waveguide filament and damping; Described waveguide filament one end is connected with metering circuit plate through after coil endoporus, and damping is arranged on the waveguide filament other end, and the waveguide filament other end is fixedly connected with loop line one end by geometrical clamp; The described loop line other end is connected with metering circuit plate; Described insulation inner protective tube is set on waveguide filament, between waveguide filament and the outer pillar of metal.
Preferred technical scheme, described magnetostrictive liquid level sensor also comprises power protecting circuit plate, and this power protecting circuit plate is positioned at described sensor head, and is positioned at outside described external shield; This power protecting circuit plate is used for carrying out multi-stage protection to input power, and opposing outside electromagnetic interference is to guarantee input end power good.
Preferred technical scheme, described power protecting circuit plate comprises the Pyatyi protection circuit sequentially connected; Wherein, first order protection circuit comprises discharge tube, and this discharge tube first end and the second end connect the positive and negative two-stage of power supply respectively, the 3rd end ground connection; Second level protection circuit comprises the bi-directional voltage stabilizing pipe, fuse and the diode that sequentially connect, and described bi-directional voltage stabilizing pipe two ends are also connected with the discharge tube first end of first order protection circuit and the second end respectively; Third level protection circuit is elementary filtering circuit, it comprises the first electric capacity, the second electric capacity and the 3rd electric capacity, with the 3rd Capacitance parallel connection after described first electric capacity and the second capacitances in series, and the link ground connection of the first electric capacity and the second electric capacity, the ungrounded end of the first electric capacity is connected with positive pole, and the ungrounded end of the second electric capacity is connected with negative pole; Fourth stage protection circuit is isolation protective circuit, and it comprises isolator, and this isolator is connected with the 3rd electric capacity of third level protection circuit; Level V protection circuit is secondary filtering circuit, and this secondary filtering circuit comprises the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, after the 4th electric capacity and the 5th capacitances in series and the 6th Capacitance parallel connection; 6th electric capacity two ends are the output terminal of power protecting circuit plate.Power protecting circuit, for the pathway of electromagnetic interference (EMI), by Pyatyi protection circuits such as ground connection, filtering, isolation, will disturb and cut off from power end, thus ensure normal work of the present invention.
Preferred technical scheme, the fuse in the protection circuit of the described second level is the fuse with self-healing, the open circuit when there is surge direct current, when input voltage recovers automatically to recover conducting normally.
Preferred technical scheme, the coil in described metering circuit assembly is unicoil, and metering circuit plate adopts differential amplifier circuit to gather this unicoil induced signal.Differential Input effectively can eliminate common mode noise signal, thus improves the signal to noise ratio (S/N ratio) of the present invention's output signal, improves accuracy of detection and antijamming capability; Compared to the Differential Input of twin coil, the present invention adopts unicoil, makes coil Differential Input metering circuit by circuit mode, effectively can reduce the size of coil like this, improves space availability ratio.
Preferred technical scheme, described coil radome is the square radome of nickel alloy with magnet.Effectively can improve the signal to noise ratio (S/N ratio) of signal on the one hand; On the other hand due to the acting in conjunction of magnet and nickel alloy material, outside electromagnetic interference (EMI) effectively can be shielded to the interference of Sensitive Apparatus coil.
Preferred technical scheme, described external shield is the square radome of cupronickel.External shield covers described metering circuit plate and described coil, effectively can shield the outside radiation interference to metering circuit plate and coil.
By adopting such scheme, compared with prior art, its technique effect is a kind of magnetostrictive liquid level sensor of the present invention:
The present invention adopts unicoil to obtain the positional information of magnet assemblies, gathers induction coil simultaneously, effectively can reduce noise in metering circuit by differential amplification form, prevents common mode interference on the impact of output signal; In addition, owing to adopting multilayer screen technology, the electromagnetic interference (EMI) in external space therefore can be prevented the impact of metering circuit and Sensitive Apparatus and coil, and improve the antijamming capability of product, signal exports more stable; Further; owing to adopting power protecting circuit; by various protection device; multi-stage filter circuit and grounding technology; be highly resistant to the impact of the various strong electromagnetic such as surge voltage, electrostatic and pulse train; thus improving the antijamming capability of product, the enforcement of multi-stage protection scheme ensure that product also can normally work under strong electromagnetic interference environment.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of a kind of magnetostrictive liquid level sensor of the present invention;
Fig. 2 is the sounding rod partial structurtes schematic diagram of a kind of magnetostrictive liquid level sensor of the present invention;
Fig. 3 is the sensor head partial structurtes schematic diagram of a kind of magnetostrictive liquid level sensor of the present invention;
Fig. 4 is the circuit theory schematic diagram of the power protection plate of a kind of magnetostrictive liquid level sensor of the present invention.
Description of reference numerals:
1, sensor head, 11, holder, 12, metering circuit assembly, 121, coil, 122, metering circuit plate, 123, loop line, 13, external shield, 14, coil radome; 2, sounding rod, 21, the outer pillar of metal, 22, insulation inner protective tube, 23, waveguide filament, 24, damping; 3, floating ball component; 4, geometrical clamp; 5, power protecting circuit plate, 501, discharge tube, 502, bi-directional voltage stabilizing pipe, 503, fuse; 504, diode, the 505, first electric capacity, the 506, second electric capacity, the 507, the 3rd electric capacity; 508, isolator, the 509, the 4th electric capacity, the 510, the 5th electric capacity, the 511, the 6th electric capacity.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with instantiation, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
As shown in Figures 1 to 4,
A kind of magnetostrictive liquid level sensor comprises sensor head 1, sounding rod 2 and floating ball component 3; Described sounding rod 2 is fixedly connected with described sensor head 1, and described floating ball component 3 is arranged on described sounding rod 2, and described floating ball component 3 can move freely along described sounding rod 2 shell; Comprise holder 11, metering circuit assembly 12, external shield 13 and coil radome 14 in described sensor head 1, described metering circuit assembly 12 comprises coil 121, metering circuit plate 122 and loop line 123; Described metering circuit plate 122 is arranged on holder 11, and described coil 121 is arranged on metering circuit plate 122; Coil 121 is stated in described coil radome 14 residence, realizes shielding to coil 121; Described external shield 13 is arranged on holder 11, covers described metering circuit plate 122 and described coil 121, realizes shielding to described metering circuit assembly 12; Described sounding rod 2 comprises the outer pillar 21 of metal, insulation inner protective tube 22, waveguide filament 23 and damping 24; Described waveguide filament 23 one end is connected with metering circuit plate 122 through after coil 121 endoporus, and damping 24 is arranged on waveguide filament 23 other end, and waveguide filament 23 other end is fixedly connected with loop line 123 one end by geometrical clamp 4; Described loop line 123 other end is connected with metering circuit plate 122; Described insulation inner protective tube 22 is set on waveguide filament 23, between waveguide filament 23 and the outer pillar 21 of metal.
Described magnetostrictive liquid level sensor also comprises power protecting circuit plate 5, and this power protecting circuit plate 5 is positioned at described sensor head 1, and is positioned at outside described external shield 13; This power protecting circuit plate 5 is for carrying out multi-stage protection to input power, and opposing outside electromagnetic interference is to guarantee input end power good.
Described power protecting circuit plate 5 comprises the Pyatyi protection circuit sequentially connected; Wherein, first order protection circuit comprises discharge tube 501, and this discharge tube 501 first end and the second end connect the positive and negative two-stage of power supply respectively, the 3rd end ground connection; Second level protection circuit comprises the bi-directional voltage stabilizing pipe 502, fuse 503 and the diode 504 that sequentially connect, and described bi-directional voltage stabilizing pipe 502 two ends are also connected with discharge tube 501 first end of first order protection circuit and the second end respectively; Third level protection circuit is elementary filtering circuit, it comprises the first electric capacity 505, second electric capacity 506 and the 3rd electric capacity 507, described first electric capacity 505 and the second electric capacity 506 are in parallel with the 3rd electric capacity 507 after connecting, and the link ground connection of the first electric capacity 505 and the second electric capacity 506, the ungrounded end of the first electric capacity 505 is connected with positive pole, and the ungrounded end of the second electric capacity 506 is connected with negative pole; Fourth stage protection circuit is isolation protective circuit, and it comprises isolator 508, and this isolator 508 is connected with the 3rd electric capacity 507 of third level protection circuit; Level V protection circuit is secondary filtering circuit, this secondary filtering circuit comprise the 4th electric capacity 509, the 5th electric capacity 510 and the 6th electric capacity the 511, four electric capacity 509 and the 5th electric capacity 510 connect after and the 6th electric capacity 511 in parallel; 6th electric capacity 511 two ends are the output terminal of power protecting circuit plate 5.Power protecting circuit, for the pathway of electromagnetic interference (EMI), by Pyatyi protection circuits such as ground connection, filtering, isolation, will disturb and cut off from power end, thus ensure normal work of the present invention.
Fuse 503 in the protection circuit of the described second level is for having the fuse of self-healing, and the open circuit when there is surge direct current, when input voltage recovers automatically to recover conducting normally.
Coil 121 in described metering circuit assembly 12 is unicoil, and metering circuit plate 122 adopts differential amplifier circuit to gather this unicoil 121 induced signal.Differential Input effectively can eliminate common mode noise signal, thus improves the signal to noise ratio (S/N ratio) of the present invention's output signal, improves accuracy of detection and antijamming capability; Compared to the Differential Input of twin coil, the present invention adopts unicoil, makes coil Differential Input metering circuit by circuit mode, effectively can reduce the size of coil like this, improves space availability ratio.
Described coil radome 14 is the square radome of nickel alloy with magnet.Effectively can improve the signal to noise ratio (S/N ratio) of signal on the one hand; On the other hand due to the acting in conjunction of magnet and nickel alloy material, outside electromagnetic interference (EMI) effectively can be shielded to the interference of Sensitive Apparatus coil.
Described external shield 13 is the square radome of cupronickel.External shield 13 covers described metering circuit plate 122 and described coil 121, effectively can shield the outside radiation interference to metering circuit plate 122 and coil 121.The double shield cover adopted, can play shield effectiveness better.
The principle of work of this magnetostrictive liquid level sensor is as follows:
The pulse current having metering circuit plate 122 to produce is loaded on waveguide filament 23 by loop line 123, and join mutually at floating ball component 3 place along waveguide filament 23 longitudinal magnetic field that axially generation this pulse current of longitudinal magnetic field produces with the magnetic field that floating ball component 3 produces, waveguide filament 23 produces pulse signal, this pulse signal is along waveguide, 23 propagate to its two ends, when this signal propagates into damping 24 place of waveguide filament 23 one end, due to the effect of damping 24, signal is cut down disappearance; When this signal propagates into coil 121 place along waveguide filament 23, coil 121 obtains this signal and is converted into corresponding electric signal, and obtained by metering circuit plate 122, the mistiming obtaining electric signal by the pulse current of computation and measurement circuit board 122 and metering circuit plate 122 can determine the present position of floating ball component 3.
When the present invention works, external shield 13 and coil radome 14 are housed respectively, coil radome 14 is the square shielding devices of nickel alloy with magnet, and its effect effectively can improve the signal to noise ratio (S/N ratio) of signal on the one hand; On the other hand due to the acting in conjunction of magnet and nickel alloy material, outside electromagnetic interference (EMI) effectively can be shielded to the interference of Sensitive Apparatus coil 121; External shield 13 is for preventing external interference to the radiation interference of metering circuit plate 122 and coil 121, like this after two-layer shielding, make Sensitive Apparatus metering circuit plate 122 and coil 121 be highly resistant to external electromagnetic radiation interference, product also can normally be worked under the electromagnetic interference of complexity;
There is various noise signal during work, as spatial electromagnetic disturbs noise, system power supply noise, the Acquisition Circuit noise brought, produce the various noise signals such as each self noise when the pulse power works on waveguide filament 23, these interference noises can affect the output of product.The present invention adopts unicoil 121 to obtain the positional information of floating ball component 3; metering circuit plate 122 and unicoil 121; metering circuit plate 122 gathers unicoil 121 induced signal by differential amplification form; effectively can reduce noise; thus improve the signal to noise ratio (S/N ratio) of product output signal, improve accuracy of detection and antijamming capability; Compared to the Differential Input of twin coil, the present invention adopts unicoil, makes coil Differential Input Acquisition Circuit by circuit mode, effectively can reduce the size of coil like this, improves space availability ratio.
The present invention adopts power protection plate 5 pairs of input powers to provide multi-stage protection, multi-layer filtering, is highly resistant to extraneous electromagnetic interference (EMI), guarantees the stable of input end power supply.As shown in fig. 4; power protection plate 5 adopts five layers of protected location; first order protection circuit is just adopting discharge tube 501 liang of termination powers; power-, the 3rd end ground connection, large voltage can import to by discharge tube 501 fast " " layer; second level protection circuit is made up of bi-directional voltage stabilizing pipe 502, fuse 503 and diode 504; bi-directional voltage stabilizing pipe 502 can reduce the residual voltage of discharge tube 501 further, and fuse 503 pairs of direct open circuits of surge current, prevent excess current.
Damage circuit below, fuse 503 has self-healing, and input voltage returns to normally can automatically restore to normal condition; Third level protection circuit is first-level filtering wave circuit (elementary filtering circuit), is made up of three electric capacity 505,506 and 507; Fourth stage protection circuit is isolation protective circuit, is made up of isolator 508; Level V protection circuit is secondary filter circuit (secondary filtering circuit); it is made up of three electric capacity 509,510 and 511; three-level protective circuit can effectively to the residual voltage eliminated after the protection of the second level below; reduce power supply noise; the harmonic wave, high frequency interference etc. of input power can effectively be eliminated; for system provides the power supply of " stable, clean "; thus effectively can suppress electromagnetic interference (EMI), guarantee that magnetostrictive high precision liquid level sensor also can normally work under strong electromagnetic interference environment.
Compared to the Differential Input of twin coil, (two coil winding need electrical specification consistent, around on the contrary; During installation, the signal that two coil-induced waveguide filaments pass over, technique need Striking symmetry install, otherwise because coil winding electrical specification is inconsistent or installation manufacture craft is asymmetric, not contrary two signals in same amplitude direction by causing two signal sources entering differential amplification, further can not effective difference stress release treatment) the present invention adopts unicoil, by reference voltage and upper and lower pull-up resistor effect, unicoil signal differential is made to input Acquisition Circuit, so not only effectively can reduce the size of coil, improve space availability ratio; Also the difficulty of coil making and mounting process can effectively be reduced on the other hand, the effective differential amplification of energy, stress release treatment.
Above-described embodiment, carrying out testing in strong electromagnetic interference environment, all have passed test.Its test is concrete as follows with reference to international standard: surge immunity IEC61000-4-5:2005, test grade: 4 grades; Electrical fast transient (eft) immunity to interference IEC61000-4-4:2012, test grade: 4 grades; Esd immunity IEC61000-4-2:2008, test grade: 4 grades; Radio frequency electromagnetic field radiation immunity IEC61000-4-3:2006+A1:2007+A2010 tests grade: 4 grades; The conducted immunity IEC61000-4-6:2008 of radio frequency electromagnetic field induction, test grade: 4 grades; Radio frequency electromagnetic field radiation harassing and wrecking degree EN55022:2010+AC:2011, test grade: classA; The conduction interference degree EN55022:2010+AC:2011 of radio frequency electromagnetic field induction, test grade: classA.
The foregoing is only preferred embodiment of the present invention, not in order to limit the scope of the invention, within the spirit and principles in the present invention all, any amendment done, equivalent to replace, be all included within protection scope of the present invention.
Claims (7)
1. a magnetostrictive liquid level sensor, comprises sensor head, sounding rod and floating ball component; Described sounding rod is fixedly connected with described sensor head, and described floating ball component is arranged on described sounding rod, and described floating ball component can move freely along described sounding rod shell; It is characterized in that: comprise holder, metering circuit assembly, external shield and coil radome in described sensor head, described metering circuit assembly comprises coil, metering circuit plate and loop line; Described metering circuit plate is arranged on holder, and described coil is arranged on metering circuit plate; Coil is stated in described coil radome residence, realizes shielding to coil; Described external shield is arranged on holder, covers described metering circuit plate and described coil, realizes shielding to described metering circuit assembly; Described sounding rod comprises the outer pillar of metal, insulation inner protective tube, waveguide filament and damping; Described waveguide filament one end is connected with metering circuit plate through after coil endoporus, and damping is arranged on the waveguide filament other end, and the waveguide filament other end is fixedly connected with loop line one end by geometrical clamp; The described loop line other end is connected with metering circuit plate; Described insulation inner protective tube is set on waveguide filament, between waveguide filament and the outer pillar of metal.
2. a kind of magnetostrictive liquid level sensor according to claim 1, is characterized in that: it also comprises power protecting circuit plate, this power protecting circuit plate is positioned at described sensor head, and is positioned at outside described external shield; This power protecting circuit plate is used for carrying out multi-stage protection to input power, and opposing outside electromagnetic interference is to guarantee input end power good.
3. a kind of magnetostrictive liquid level sensor according to claim 2, is characterized in that: described power protecting circuit plate comprises the Pyatyi protection circuit sequentially connected; Wherein, first order protection circuit comprises discharge tube, and this discharge tube first end and the second end connect the positive and negative two-stage of power supply respectively, the 3rd end ground connection; Second level protection circuit comprises the bi-directional voltage stabilizing pipe, fuse and the diode that sequentially connect, and described bi-directional voltage stabilizing pipe two ends are also connected with the discharge tube first end of first order protection circuit and the second end respectively; Third level protection circuit is elementary filtering circuit, it comprises the first electric capacity, the second electric capacity and the 3rd electric capacity, with the 3rd Capacitance parallel connection after described first electric capacity and the second capacitances in series, and the link ground connection of the first electric capacity and the second electric capacity, the ungrounded end of the first electric capacity is connected with positive pole, and the ungrounded end of the second electric capacity is connected with negative pole; Fourth stage protection circuit is isolation protective circuit, and it comprises isolator, and this isolator is connected with the 3rd electric capacity of third level protection circuit; Level V protection circuit is secondary filtering circuit, and this secondary filtering circuit comprises the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, after the 4th electric capacity and the 5th capacitances in series and the 6th Capacitance parallel connection; 6th electric capacity two ends are the output terminal of power protecting circuit plate.
4. a kind of magnetostrictive liquid level sensor according to claim 3; it is characterized in that: the fuse in the protection circuit of the described second level is the fuse with self-healing; the open circuit when there is surge direct current, when input voltage recovers automatically to recover conducting normally.
5. a kind of magnetostrictive liquid level sensor according to claim 1, is characterized in that: the coil in described metering circuit assembly is unicoil, and metering circuit plate adopts differential amplifier circuit to gather this unicoil induced signal.
6. a kind of magnetostrictive liquid level sensor according to claim 1, is characterized in that: described coil radome is the square radome of nickel alloy with magnet.
7. a kind of magnetostrictive liquid level sensor according to claim 1, is characterized in that: described external shield is the square radome of cupronickel.
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| CN201610079593.4A CN105547416B (en) | 2016-02-04 | 2016-02-04 | A kind of magnetostrictive liquid level sensor |
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| CN201610079593.4A CN105547416B (en) | 2016-02-04 | 2016-02-04 | A kind of magnetostrictive liquid level sensor |
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| CN106525195A (en) * | 2016-12-11 | 2017-03-22 | 丹东通博电器(集团)有限公司 | Meter mechanism of magnetostriction liquid level gauge |
| CN108594311A (en) * | 2018-06-11 | 2018-09-28 | 中国石油天然气集团公司 | A kind of harmonic source detection device and method based on magnetostriction cable |
| CN109443498A (en) * | 2019-01-07 | 2019-03-08 | 肇庆市高新区笙辉机械有限公司 | A kind of liquid level detection device and liquid-level detecting method |
| CN109813397A (en) * | 2019-04-01 | 2019-05-28 | 张永立 | A three-dimensional guided floating disc liquid level sensor |
| CN110375632A (en) * | 2019-08-23 | 2019-10-25 | 河北工业大学 | A kind of magnetostrictive displacement sensor suitable for big temperature range/hot environment |
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| CN111504442A (en) * | 2020-04-27 | 2020-08-07 | 天津恒立远大仪表股份有限公司 | Tuning fork switch probe structure |
| CN111729833A (en) * | 2020-07-28 | 2020-10-02 | 江门市润宇传感器科技有限公司 | A high stability magnetostrictive transducer |
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| CN112729479A (en) * | 2020-12-23 | 2021-04-30 | 北京斯克维思仪表有限公司 | Coil type magnetostrictive sensor |
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