CN206399357U - Eddy current displacement sensor and its probe and coil - Google Patents
Eddy current displacement sensor and its probe and coil Download PDFInfo
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- CN206399357U CN206399357U CN201621080905.5U CN201621080905U CN206399357U CN 206399357 U CN206399357 U CN 206399357U CN 201621080905 U CN201621080905 U CN 201621080905U CN 206399357 U CN206399357 U CN 206399357U
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Abstract
The utility model provides a kind of eddy current displacement sensor and its probe and coil, wherein, the probe includes：Winding bracket, the winding bracket is in integrally revolving body, and it has first end and the second end along axis direction, wherein, it is formed with auxiliary section close to first end position；Coil, is arranged on the winding bracket；The overall revolving body annular in shape of the coil, the thiol is provided with the through hole for being engaged with the auxiliary section, and the inner surface that the coil is located at the insertion hole site is axially formed with change internal diameter section.The eddy current displacement sensor and its probe and coil that the utility model is provided can meet installation and detection demand simultaneously.
Description
Technical field
The present invention relates to sensor field, in particular to a kind of eddy current displacement sensor and its probe and coil.
Background technology
The noncontact of eddy current displacement sensor energy, high linearity, measure metal conductor measured away from probe table high resolution
Identity distance is from being a kind of non-contacting linearisation metering outfit.Eddy current displacement sensor usually be applied to high-speed rotating machine and
Reciprocating machine performance is analyzed, in vibration research, analysis measurement, and it can obtain non-contacting high accuracy vibration, displacement letter
Number, many kinds of parameters of rotor oscillation state, radial vibration, amplitude and the axial location of such as axle can be continuously collected exactly
Deng.Current vortex sensor is so that its reliable long-term working is good, measurement range is wide, sensitivity is high, high resolution the advantages of, large-scale
It is used widely in the on-line monitoring and fault diagnosis of rotating machinery state.
Specifically, eddy current displacement sensor is mainly made up of leading sensor device, probe and cable.Wherein, pop one's head in
Displacement for sensing tested metal object.Probe is main by winding bracket and the coil group being wound on the winding bracket
Into.On the whole, the overall dimensions of probe depend primarily on the size of coil.Probe is connected by cable with fore-lying device, will
The signal detected is transferred to fore-lying device.Leading sensor device is received after probe signal, and conditioning output is carried out to probe signal
Electric signal.
In use, probe needs to set to detected material preset distance.When detected material because the limitation of this body structure makes
Its provide install the probe space it is very limited when, it is necessary to select the less current vortex displacement of probe size as much as possible
Sensor could realize the installation of probe；And at the same time, due to the size of probe it is smaller when, the size of its coil is also smaller,
Its corresponding corresponding linear measurement range is also just small, it is more likely that can not meet the demand of detection.That is, it is empty currently for installing
Between narrow and small occasion, when it requires higher to measurement range, the problem of current eddy current displacement sensor has inapplicable.
As fully visible, it is necessary to the improvement of structure is carried out to eddy current displacement sensor, installation can be met simultaneously
With the demand of detection.
The content of the invention
The present invention is intended to provide a kind of can meet eddy current displacement sensor and its spy installed with detection demand simultaneously
Head and coil.
The invention provides one kind probe, including：
Winding bracket, the winding bracket is in integrally revolving body, and it has first end and the second end along axis direction, its
In, it is formed with auxiliary section close to first end position；
Coil, is arranged on the winding bracket；The overall revolving body annular in shape of the coil, the middle part, which is provided with, to be used for
The through hole being engaged with the auxiliary section, the inner surface that the coil is located at the insertion hole site is axially formed with change
Internal diameter section.
Further, the internal diameter of the through hole axially at least partly gradually increasing along the coil.
Further, the cross section that the coil is located at the inner surface of the insertion hole site is trapezoidal.
Further, it is described trapezoidal for isosceles trapezoid.
Further, the auxiliary section is the groove that is inwardly formed of the winding bracket surface, the gradient of the groove with
The acute angle of the isosceles trapezoid matches.
A kind of eddy current displacement sensor, it includes：Any above-mentioned probe, and be connected by cable with the probe
Fore-lying device.
Further, the eddy current displacement sensor also includes housing, and the fore-lying device, cable and probe integration are set
Put in the housing；Or, the probe is provided separately within the housing.
A kind of coil, it is wound on winding bracket by an at least strand and formed, the overall revolving body annular in shape of the coil,
Its middle part is provided with the through hole for being engaged with the winding bracket, and the coil is located at the interior table of the insertion hole site
Face is axially formed with change internal diameter section.
Further, the internal diameter of the through hole axially at least partly gradually increasing along the coil.
Further, the cross section that the coil is located at the inner surface of the insertion hole site is trapezoidal.
The invention provides a kind of eddy current displacement sensor, internal diameter section is become by setting inner surface to have in probe
Coil, relative to existing coil inner surface be constant internal diameter for, equivalent to by existing coil close to inner surface local coil
It is displaced outwardly, makes it closer to detection faces, so that the electric current that passes through of coil current vortex intensity in measured object is bigger.
After field intensity increase is vortexed, coil changes with detection faces in relative distance farther place Ye You vortex fields, in the excursion
As linear sensor range ability, i.e., the improvement of above-mentioned loop construction can finally improve eddy current displacement sensor overall wire
Property range ability, finally realize on the premise of the external diameter of probe coil is not increased, increase eddy current displacement sensor survey
Measure scope, in other words for same measurement range, the application provide eddy current displacement sensor it is smaller,
It is easily installed.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply mode and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of structural representation of eddy current displacement sensor in the application embodiment；
Fig. 2 is a kind of principle schematic of the fore-lying device of eddy current displacement sensor in the application embodiment；
Fig. 3 is a kind of sonde configuration schematic diagram of eddy current displacement sensor in the application embodiment；
Fig. 4 is a kind of sectional view of the coil in probe of eddy current displacement sensor in the application embodiment；
Fig. 5 is the sectional view of coil in the prior art in the probe of eddy current displacement sensor；
Fig. 6 is trapezoidal coil and square coil vortex field comparison diagram.
Description of reference numerals：
1st, pop one's head in；2nd, cable；3rd, fore-lying device；31st, crystal oscillator；32nd, amplifier；33rd, wave detector；34th, wave filter；
11st, coil；12nd, winding bracket；110th, through hole；120th, groove；1A, square coil；1B, trapezoidal coil.
Embodiment
With reference to the description of accompanying drawing and the specific embodiment of the invention, the details of the present invention can be clearly understood.But
It is, the embodiment of invention described herein to be only used for explaining the purpose of the present invention, and can not understands in any way
Into being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that any possible change based on the present invention
Shape, these are regarded as belonging to the scope of the present invention.
It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element
Or can also have element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term " installation ", " connected ", " connection " should be interpreted broadly, example
Such as, it can be mechanical connection or electrical connection or the connection of two element internals, can be joined directly together, can also lead to
Cross intermediary to be indirectly connected to, for the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning.Below with reference to the accompanying drawings and combine embodiment and describe the present invention in detail.
According to faraday electromagnetic induction principle, metallic conductor is placed in the magnetic field of change or made in magnetic field cutting magnetic line
During motion, the induced-current in vortex shape will be produced in conductor, this electric current is referred to as eddy current effect current vortex, above phenomenon.
And the scales being made according to eddy current effect are eddy current sensor.Eddy current displacement sensor is a kind of contactless
Displacement detecting sensor, it relies on the electromagnetic induction mechanism work between the coil and metal conductor measured of probe.
The Eddy-current sensor system generally used at present, is influenceed by signal processing circuit and because current vortex is imitated
It should be non-linear, so the measurement range of eddy current displacement sensor is smaller, generally 1/3-l/5 of probe diameter.Example
Such as, the measurement range of the probe of diameter 5 millimeters (mm) is lmm or 2mm.
Embodiments, provides a kind of current vortex displacement sensing that can simultaneously meet and install with detection demand by the application
Device and its probe and coil, i.e., can increase eddy current displacement sensor on the premise of the external diameter of probe coil is not increased
Measurement range, in other words for same measurement range, the size for the eddy current displacement sensor that the application is provided is more
It is small, it is easily installed.
Referring to Fig. 1, a kind of eddy current displacement sensor proposed in the application embodiment can include：1 He of probe
The fore-lying device 3 being connected by cable 2 with the sensor.
In the present embodiment, the fore-lying device 3 is used to handle the signal that the probe 1 is detected, and exports
Corresponding electric signal.
Please refer to schematic diagram in Fig. 2, Fig. 2 and illustrate the signal processing of eddy current displacement sensor fore-lying device 3.When
After one group of high-frequency excitation signal is by LC, it can export that a corresponding frequency is constant, the alternating voltage feedback signal of amplitude change,
Amplitude changes with inductance L displacements different from detection faces, and the feedback signal can be defeated after the processing such as detection, amplification, filtering
Go out corresponding voltage signal.
In a specific embodiment, the fore-lying device 3 can include crystal oscillator 31, the LC electricity being sequentially connected
Road, amplifier 32, wave detector 33, wave filter 34 and the resistance R and the amplification are arranged on by way of being connected in parallel
Inductance L and electric capacity C between device 32.Wherein, one end of the inductance L is connected between the resistance R and the amplifier 32,
The other end is grounded.One end of the electric capacity C is connected between the resistance R and the amplifier 32, and the other end is also grounded.
Certainly, the concrete composition of the fore-lying device 3 and connection etc. are not limited to the example above, and those skilled in the art may be used also
To make other changes, the application does not make specific limit herein.
In the present embodiment, the probe 1 can be used for the displacement for sensing tested metal object.
Fig. 3 is please referred to, probe 1 is main by winding bracket 12 and 11 groups of coil being wound on the winding bracket 12
Into.Wherein, it is in revolving body that the winding bracket 12 is overall, its along axis direction have back to first end and the second end,
Wherein, it is formed with auxiliary section close to first end position.It is arranged on the coil 11 on the winding bracket 12；The coil 11
Overall revolving body annular in shape, its middle part is provided with the through hole 110 for being engaged with the auxiliary section, and the coil 11 is located at
The inner surface of the position of through hole 110 is axially formed with change internal diameter section.
In the present embodiment, inner surface of the coil 11 positioned at the position of through hole 110 axially can be with shape
Become internal diameter section into having.When the inner surface of the coil 11 is formed with change internal diameter section, relative to the existing inner surface of coil 11 for not
Become for internal diameter, be displaced outwardly equivalent to the local coil 11 by existing coil 11 close to inner surface, make it closer to detection faces,
So that the electric current that passes through of coil 11 current vortex intensity in measured object is bigger.After field intensity increase is vortexed, coil
11 change with detection faces in relative distance farther place Ye You vortex fields, are linear sensor range model in the excursion
Enclose, i.e., the improvement of the above-mentioned structure of coil 11 can finally improve eddy current displacement sensor overall linear range ability.As originally
There can be vortex field change in the range of 0-2mm, after enhancing current vortex intensity, also be changed in the range of 0-3mm, so that by range
Scope increases to 3mm from 2mm.
Wherein, the change internal diameter section can have change into the corresponding internal diameter in the position of 11 through hole of coil 110, be non-
Constant.Specifically, the internal diameter section that becomes can be by the internal diameter of the position of through hole 110 of the coil 11 along the coil 11
Axially at least partly gradually increase is formed.Or, the change internal diameter section can also be inwardly formed into the inner surface of the coil 11
Local reducing section etc..Certainly, the form and generation type for becoming internal diameter section is not limited to foregoing description, art technology
Personnel the application technical spirit enlightenment under, it is also possible to make other changes, but as long as its realize function and effect with
The application is same or similar, all should be covered by the application protection domain.
Further, the cross section that the coil 11 is located at the inner surface of the position of through hole 110 can be trapezoidal.
In the present embodiment, the internal diameter of the inner surface of the coil 11 can be from one end of coil 11 towards coil 11
Other end becomes larger, i.e., the cross section of the inner surface of described coil 11 can be trapezoidal, in order to which coil 11 is close interior
The local coil 11 on surface is displaced outwardly, and makes it closer to detection faces, so that the electric current that coil 11 passes through is tested
Current vortex intensity is bigger in thing, and then improves the linearity measuring range of eddy current displacement sensor.
In one embodiment, it is described it is trapezoidal can be isosceles trapezoid.Accordingly, the auxiliary section is the coiling branch
The groove 120 that the surface of frame 12 is inwardly formed, the acute angle of the gradient and the isosceles trapezoid of the groove 120 matches.
In the present embodiment, the corresponding cross section of inner surface of the coil 11 can be isosceles trapezoid, accordingly, if
The groove 120 matched with the isosceles trapezoid can be provided with by putting the surface of the winding bracket 12 of the coil 11, described recessed
The acute angle of the gradient of groove 120 and the isosceles trapezoid matches, specifically, can be with identical.When the surface of the winding bracket 12
Groove 120 the gradient it is identical with the acute angle of the isosceles trapezoid when, that is, represent the outer cross section of the groove 120 for sectional area by
The circle of gradual change, the shape of above-mentioned groove 120 be not only due to and detour support machine-shaping and also advantageously reduce coil
11 difficulty installed with the winding bracket 12.In a specific embodiment, the angle of the acute angle of the isosceles trapezoid
It can be 45 degree.Certainly, the angle of the acute angle of the isosceles trapezoid is not limited to the example above, and the application is herein and work is specific
Limit.
In one embodiment, the eddy current displacement sensor can also include housing, the fore-lying device 3, cable
With 1 integrated setting of probe in the housing, or, the probe 1 is provided separately within the housing.
When the probe 1 is set with the split of fore-lying device 3, the housing is used for the outside for being arranged on the probe 1.
When the fore-lying device 3, cable and 1 integrated setting of probe are in housing, the fore-lying device 3, cable and probe 1 can bases
Actual installation requirements carry out reasonable layout, so as to ensure that the appearance and size of the housing is smaller as far as possible.Specifically, before described
Device 3,1 distribution in the housing of cable and probe are put, the application does not make specific limit herein.When the fore-lying device 3,
During 1 integrated setting of cable and probe, comparatively, the appearance and size of its shell can be larger, now, includes for all parts
Fore-lying device 3, cable 2 and probe 1 it is compact in size just it is especially prominent., all can be to peace for the size of probe 1
Dress size is brought greater impact.
When actual use, the medium-high frequency oscillating current of fore-lying device 3 in eddy current displacement sensor system is flowed into by cable
Pop one's head in 1 coil 11, the magnetic field of alternation is produced in the coil 11 of probe 1.It is when tested metallic object is close to this magnetic field, then golden herein
Metal surface produces induced-current, and at the same time current vortex field also produces a direction and the alternation magnetic in opposite direction of coil 11
.Due to its reaction, it is changed the amplitude and phase of the high frequency electric of coil 11 and (changes effective resistance of coil 11
It is anti-).This change and metal bulk permeability, electrical conductivity, the geometry of coil 11, physical dimension, power frequency and head
Coil 11 arrives the relating to parameters such as the distance on metallic conductor surface.Often assume that metallic conductor is uniform in material and performance is linear and each
The same sex, then the physical property of coil 11 and metallic conductor system can by metallic conductor electrical conductivity б, magnetic conductivity ξ, size factor
τ, coil 11 and metallic conductor surface are described apart from D, current strength I and frequencies omega parameter.The then characteristic impedance of coil 11 can
Represented with Z=F (τ, ξ, б, D, I, ω) functions.Generally we can accomplish to control τ, ξ, б, I, and these parameters of ω are in certain model
Enclose interior constant, then the characteristic impedance Z of coil 11 just turns into the monotropic function apart from D, although its whole function is one nonlinear,
Its Function feature is " S " type curve, but it is approximately linear one section that can choose it.In this, pass through the electronic circuit of fore-lying device 3
Processing, the change apart from D of the change of the impedance Z of coil 11, i.e. coil 11 and metallic conductor is changed into the change of voltage or electric current
Change, the size of output signal changes with probe 1 to the spacing between measured body surface, realize the displacement to metal object, shake
The measurement of the parameter such as dynamic.
Please refer in Fig. 4 to Fig. 6, the application embodiment, by the coil that the cross section of current inner surface is rectangle
(hereinafter referred to as square coil 1A) and the application inner surface cross section are right for trapezoidal coil (hereinafter referred to as trapezoidal coil 1B)
The vortex field answered is contrasted, and abscissa represents displacement in figure；Ordinate represents to be vortexed field intensity.It can be seen that trapezoidal coil 1B
Corresponding vortex field intensity is significantly stronger than the square coil 1A, accordingly, for trapezoidal coil 1B is equivalent to square coil 1A,
Under the conditions of same outer diameter, its corresponding linearity measuring range scope is bigger.
Eddy current displacement sensor described herein, by setting inner surface that there is the line for becoming internal diameter section in probe 1
Circle 11, relative to the existing inner surface of coil 11 be constant internal diameter for, equivalent to by existing coil 11 close to inner surface part
Coil 11 is displaced outwardly, and makes it closer to detection faces, so that the electric current that passes through of coil 11 current vortex in measured object
Intensity is bigger.After field intensity increase is vortexed, coil 11 changes with detection faces in relative distance farther place Ye You vortex fields, at this
It is linear sensor range ability in excursion, i.e., the improvement of the above-mentioned structure of coil 11 can finally improve current vortex displacement
Sensor overall linear range ability, finally realizes on the premise of the external diameter of 1 coil 11 of probe is not increased, increases current vortex
The measurement range of displacement transducer, in other words for same measurement range, the current vortex displacement that the application is provided is passed
Sensor it is smaller, be easily installed.
A kind of coil 11 is additionally provided in the application embodiment, it is wound on shape on winding bracket 12 by an at least strand
Into, the overall revolving body annular in shape of coil 11, its middle part is provided with the through hole for being engaged with the winding bracket 12
110, the inner surface that the coil 11 is located at the position of through hole 110 is axially formed with change internal diameter section.
In one embodiment, the internal diameter of the through hole 110 along the coil 11 axially at least partly gradually
Increase.
In a specific embodiment, the coil 11 is located at the transversal of the inner surface of the position of through hole 110
Face is trapezoidal.
Specifically, the structure of the coil and its structure improve the technique effect and above-mentioned current vortex displacement that correspondence is produced
The coil popped one's head in sensor embodiment is corresponding, and the application will not be repeated here.
Each above-mentioned embodiment in this specification is described by the way of progressive, identical between each embodiment
Similar portion is cross-referenced, and what each embodiment was stressed is and other embodiment difference.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, for this area
For technical staff, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. one kind probe, it is characterised in that including：
Winding bracket (12), the winding bracket (12) is in integrally revolving body, and it has first end and second along axis direction
End, wherein, it is formed with auxiliary section close to first end position；
Coil (11), is arranged on the winding bracket (12)；The overall revolving body annular in shape of the coil (11), the coil
(11) through hole (110) for being engaged with the auxiliary section is provided with the middle part of, the coil (11) is located at the insertion
The inner surface of hole (110) position is axially formed with change internal diameter section.
2. probe according to claim 1, it is characterised in that the internal diameter of the through hole (110) is along the coil
(11) axially at least part gradually increases.
3. probe according to claim 2, it is characterised in that the coil (11) is located at the through hole (110) position
Inner surface cross section to be trapezoidal.
4. probe according to claim 3, it is characterised in that described trapezoidal for isosceles trapezoid.
5. probe according to claim 4, it is characterised in that the auxiliary section is that the winding bracket (12) surface is inside
The groove (120) of formation, the acute angle of the gradient and the isosceles trapezoid of the groove (120) matches.
6. a kind of eddy current displacement sensor, it is characterised in that it includes：Probe (1) as described in claim 1 to 5 is any,
And the fore-lying device (3) being connected by cable (2) with the probe (1).
7. eddy current displacement sensor as claimed in claim 6, it is characterised in that also including housing, the fore-lying device (3),
Cable (2) and probe (1) integrated setting are in the housing；Or, the probe (1) is provided separately within the housing.
8. a kind of coil, it is characterised in that it is wound on winding bracket (12) by an at least strand and formed,
The overall revolving body annular in shape of the coil (11), its middle part, which is provided with, to be used for and passing through that the winding bracket (12) is engaged
Through hole (110), the inner surface that the coil (11) is located at the through hole (110) position is axially formed with change internal diameter section.
9. coil according to claim 8, it is characterised in that the internal diameter of the through hole (110) is along the coil
(11) axially at least part gradually increases.
10. coil according to claim 9, it is characterised in that the coil (11) is located at the through hole (110) position
Inner surface cross section to be trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621080905.5U CN206399357U (en) | 2016-09-26 | 2016-09-26 | Eddy current displacement sensor and its probe and coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621080905.5U CN206399357U (en) | 2016-09-26 | 2016-09-26 | Eddy current displacement sensor and its probe and coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206399357U true CN206399357U (en) | 2017-08-11 |
Family
ID=59506782
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621080905.5U Withdrawn - After Issue CN206399357U (en) | 2016-09-26 | 2016-09-26 | Eddy current displacement sensor and its probe and coil |
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| CN (1) | CN206399357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500580A (en) * | 2016-09-26 | 2017-03-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Eddy current displacement sensor and its probe and coil |
-
2016
- 2016-09-26 CN CN201621080905.5U patent/CN206399357U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500580A (en) * | 2016-09-26 | 2017-03-15 | 珠海格力节能环保制冷技术研究中心有限公司 | Eddy current displacement sensor and its probe and coil |
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