CN210051386U - Electric eddy current electromechanical conversion device - Google Patents
Electric eddy current electromechanical conversion device Download PDFInfo
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- CN210051386U CN210051386U CN201920882170.5U CN201920882170U CN210051386U CN 210051386 U CN210051386 U CN 210051386U CN 201920882170 U CN201920882170 U CN 201920882170U CN 210051386 U CN210051386 U CN 210051386U
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- eddy current
- electromechanical conversion
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Abstract
The utility model discloses an eddy current electromechanical conversion device, it includes the disc of partial metallization, printed circuit board, a plurality of induction coil is right, excitation device, and measuring device, wherein partial metallized disc is suitable for and connects outside rotary part and synchronous revolution that awaits measuring, printed circuit board sets up with partial metallized disc parallel relatively, induction coil is right including primary and secondary, primary and secondary are coaxial setting respectively at printed circuit board's positive and negative two sides, and the central axis that each induction coil is right parallels with the central axis of partial metallized disc, excitation device electricity is connected in primary, secondary electricity is connected in measuring device, primary and secondary couple through the mutual inductance, measuring device changes output measured signal according to secondary's induction variable. The utility model discloses simple structure, the installation of being convenient for, and the mutual inductance coefficient between primary and secondary coil is great, and the consumption is lower.
Description
Technical Field
The utility model relates to a measurement detects technical field, more specifically relates to an electric vortex electromechanical transducer.
Background
In general, a liquid meter measures data such as a liquid flow rate and a flow velocity based on rotation of a rotary member. Therefore, it is important to detect the number of turns, direction, speed, etc. of the rotating component. At present, electromechanical (i.e. mechanical quantity and electric quantity) signal conversion of the water meter is realized based on the eddy current effect, and the electromechanical conversion mode is the most common electromechanical conversion mode for the current intelligent water meter. It can realize the conversion of accumulated flow and instantaneous flow.
However, the existing devices for electromechanical conversion based on the eddy current principle have some disadvantages. The existing scheme is adopted, the excitation coil and the sensing coil are designed into an integrated three-dimensional structure, a large installation space is needed, the installation is inconvenient, the manufacturing cost of the coil is high, and the performance cost is low.
Prior patent publication CN101137892A discloses an inductive angular position sensor comprising a partially metallized disc adapted to rotate about its own axis of rotation, a primary coil, and several secondary coils arranged in pairs substantially symmetrically with respect to said axis of rotation to form one or more pairs of secondary coils, whereby each pair of said secondary coils is connected to each other in series and in anti-phase with respect to each other on the one hand, and to a terminal of a measuring device capable of generating an output signal dependent on the voltage at the terminals of said pair on the other hand, said primary coil surrounding said secondary coils. According to the scheme, the planar inductance coil adopting the printed board mode is small in required installation space, but the mutual inductance coefficients of the primary coil and the secondary coil are low because the central axes of the primary coil and the secondary coil are not overlapped, so that the coupling of an excitation signal from the primary coil to the secondary coil is not facilitated, and large power loss exists. In addition, the structure limits the effective acting distance between the coil and the measured object, and is not beneficial to increasing the acting distance of the coil to the measured object.
It is also worth mentioning that the two schemes do not consider the problem of static magnetic interference, when the external static magnetic field interferes, the sensing coil signal will make mistakes, which causes the electromechanical conversion device to generate larger conversion error, and affects the normal use of the water meter.
In view of the above, there is a need in the art for a new eddy current electromechanical conversion device to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an eddy current electromechanical conversion device, simple structure, required installation space is less, the installation of being convenient for, and the cost is lower, and the sexual valence is higher.
Another object of the present invention is to provide an eddy current electromechanical conversion device, in which the mutual inductance between the primary coil and the secondary coil is large, the power consumption is low, and the effective acting distance of the inductance coil is large.
Another object of the present invention is to provide an eddy current electromechanical transducer, which can effectively eliminate the interference of external static magnetic field, avoid the occurrence of large measurement error, and ensure the accuracy of measurement.
Another object of the utility model is to provide an eddy current electromechanical conversion device, the eddy current of production is stronger, and is great to secondary coil's reaction ability, is favorable to improving the measurement accuracy.
In order to achieve the above object, the present invention provides an eddy current electromechanical conversion apparatus, which includes:
the device comprises a partially metallized disk, a printed circuit board, a plurality of induction coil pairs, an excitation device and a measuring device, wherein the partially metallized disk is suitable for being connected with an external rotating component to be tested and synchronously rotating;
the exciting device is electrically connected with the primary coil, the secondary coil is electrically connected with the measuring device, the primary coil and the secondary coil are coupled through mutual inductance, and the measuring device outputs a measuring signal according to the induction quantity change of the secondary coil.
According to the utility model discloses a preferred embodiment, partly metallized disc includes non-metallic disc and semi-circular sheetmetal, semi-circular sheetmetal sets up non-metallic disc surface and with non-metallic disc is concentric.
Preferably, the semicircular metal plate is made of one of silver, silver alloy, copper, or copper alloy, and has a low resistivity to generate a large eddy current.
Preferably, the thickness of the semicircular metal sheet is 0.1 mm to 2.0 mm.
Preferably, the number of the induction coil pairs is odd or even, and the central axis formed by each induction coil pair is coincident with the central axis of the partially metallized disk.
Preferably, the periphery of the printed circuit board is provided with a magnetic shield which can shield the interference of an external static magnetic field.
Preferably, the periphery of the partially metallized disk is provided with a magnetic shielding ring capable of shielding the interference of an external static magnetic field.
Compared with the prior art, the beneficial effects of the utility model reside in that: the primary coil and the secondary coil are coaxially arranged on the front side and the back side of the printed circuit board respectively, the required installation space is small, the installation is convenient, the coaxial structure enables the mutual inductance between the primary coil and the secondary coil to be large, the power consumption is low, and the effective action distance of the inductance coil is large; the semi-circular metal sheet has low resistivity and large thickness, so that the generated eddy current is strong, the reaction capability on the secondary coil is large, and the metering accuracy is improved; the magnetic shielding structure can effectively eliminate the interference of an external static magnetic field and avoid larger metering errors.
The above and other objects, features and advantages of the present invention will be further apparent from the following detailed description and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of an eddy current electromechanical conversion apparatus according to a preferred embodiment of the present invention;
fig. 2 is a top view of a printed circuit board according to a preferred embodiment of the present invention;
fig. 3 is a waveform diagram of signals when a pair of induction coils is over a non-metallic region and over a metallic region according to a preferred embodiment of the present invention;
fig. 4 is a schematic view of a measuring process of the measuring device according to the preferred embodiment of the present invention;
in the figure: a partially metallized disk 10; a non-metallic disc 11; a semicircular metal piece 12; a printed circuit board 20; a primary coil 31; the secondary coil 32; a magnetic shield 41; the magnetic shield ring 42; a water meter housing 50; and a glass 51.
Detailed Description
The following description will be further described with reference to the accompanying drawings and specific embodiments, and it should be noted that any combination of the following described embodiments or technical features can be used to form a new embodiment without conflict.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1 to 4 of the drawings, an eddy current electromechanical conversion apparatus according to a preferred embodiment of the present invention will be explained in the following description.
As shown in fig. 1 and 2, the eddy current electromechanical conversion device includes a partially metalized disk 10, a printed circuit board 20, a plurality of induction coil pairs, an excitation device (not shown), and a measurement device (not shown).
The partially metallized disk 10 is adapted to be connected to an external rotating member to be tested and rotated in synchronization, and the printed circuit board 20 is disposed in parallel opposition to the partially metallized disk 10. Taking the application scenario of the water meter as an example, as shown in fig. 1, the partially metallized disk 10 is disposed in a meter case 50 of the water meter and is adapted to be connected to a rotating member for metering in the water meter, and the partially metallized disk 10 and the rotating member in the water meter keep rotating synchronously. The printed circuit board 20 is disposed on the glass 51 of the water meter case 50 and is in parallel opposition to the partially metallized disk 10.
It is easily understood by those skilled in the art that the external rotating component to be measured is not limited to only the rotating component used for metering in the water meter, but the present invention provides the eddy current electromechanical conversion device which is also applicable to electromechanical conversion of the rotating component in other application scenarios.
Further, the pair of induction coils includes a primary coil 31 and a secondary coil 32. The primary coil 31 and the secondary coil 32 are respectively and coaxially arranged on the front surface and the back surface of the printed circuit board 20, and the central axis of each induction coil pair is parallel to the central axis of the partially metallized disk 10.
As shown in fig. 2, in the preferred embodiment, the number of the induction coil pairs is 4, and the induction coil pairs are uniformly arranged on the printed circuit board 20, and the central axis of each induction coil pair coincides with the central axis of the partially metallized disk 10.
It is easily understood that the number of the pair of induction coils is not limited in the present invention, and the identification resolution of the eddy current switching can be improved by increasing the number of the pair of induction coils. The contents and features of the eddy current electromechanical conversion device of the present invention are illustrated and disclosed in the present preferred embodiment by the case where the number of the pairs of the induction coils is 4 pairs, but the number of the pairs of the induction coils is 4 pairs and cannot be regarded as a limitation to the contents and scope of the eddy current electromechanical conversion device of the present invention. Alternatively, in other possible examples of the present invention, the number of pairs of induction coils may also be, but is not limited to, implemented as 3 pairs, 5 pairs, 6 pairs, etc.
As a preferred embodiment, in the present embodiment, the partially metallized disk 10 includes a non-metallic disk 11 and a semicircular metal sheet 12. The non-metal disc 11 is suitable for being connected with an external rotating component to be tested, and the semicircular metal sheet 12 is arranged on the surface of the non-metal disc 11 in a clamping and embedding mode and is concentric with the non-metal disc 11.
Further, the exciting device is electrically connected to the primary coil 31, the secondary coil 32 is electrically connected to the measuring device, the primary coil 31 and the secondary coil 32 are coupled by mutual inductance, and the measuring device outputs a measuring signal according to the change of the inductance of the secondary coil 32. The electric eddy current effect is utilized to convert the rotation amount of the rotating component of the water meter into the change of the induction amount of the plurality of secondary coils 32, such as impedance change, inductance change, quality factor and the like, thereby achieving the purpose of electromechanical conversion.
It is worth mentioning that the primary coil 31 and the secondary coil 32 are respectively and coaxially disposed on the front and back sides of the printed circuit board 20, so that the required installation space is small, the structure is simple, the installation is convenient, the coaxial structure enables the mutual inductance between the primary coil 31 and the secondary coil 32 to be large, the power consumption is low, and the effective acting distance of the inductance coil is increased.
In particular, the excitation means energizes the primary coil 31 with an alternating excitation current, the primary coil 31 coupling the signal to the secondary coil 32 by mutual induction. At this time, the secondary coil 32 will generate an alternating current I
1An alternating magnetic field H is generated around the secondary coil 32 due to the change of the current
1. The partially metallized disk 10 may be considered as an electrical vortex generator if the semicircular metal sheet 12 is placed in the alternating magnetic field H
1Below, an eddy current I is generated in the semicircular metal sheet 12
2Eddy current I
2Will also generate a new magnetic field H
2，H
2And H
1In opposite directions, thereby canceling part of the magnetic field H around the secondary coil 32
1Resulting in a change in the inductance (impedance, inductance, quality factor, etc.) of the secondary coil 32.
As shown in fig. 3, it shows the signal waveform diagram of the pair of induction coils above the non-metal region and above the metal region, respectively, where the left side is the signal waveform above the non-metal region and the right side is the signal waveform above the metal region. Illustratively, as shown in FIG. 4, it is shown that two pairs L of said induction coils are utilized
1And L
2A schematic view of the measuring process of the measuring device, by signal processing of the measuring device, the amount of rotation and the direction of rotation of the partially metallized disk 10 can be identified by two pairs of the induction coils.
It will be readily appreciated by those skilled in the art that the discrimination of eddy current switching, i.e. the number of states output per revolution of the partially metallised disc 10, can be improved by increasing the number of pairs of induction coils.
In order to ensure that the secondary coil 32 senses the difference between the metallic and non-metallic areas of the partially metallized disk 10 significantly over a distance, the eddy currents I in the semicircular metal sheet 12 need to be increased
2To induce eddy currentsI
2The generated magnetic field H
2The magnetic field H around the secondary coil 32 can be cancelled as much as possible
1Thereby causing a significant change in the amount of induction of the secondary coil 32. Therefore, it is required to reduce the eddy current I
2Resistance value R of the semicircular metal piece 12 on the flow path
2So that I
2Become larger with H
2Become large, eventually resulting in H
1And is significantly smaller.
Resistance value R
2Is formed by the following formula
Wherein h is the thickness of the semicircular metal sheet 12, r
aIs the outer diameter of the eddy current loop, r
iIs the inner diameter of the eddy current loop. Therefore, by increasing the thickness h of the semicircular metal piece 12 and reducing the resistivity ρ of the semicircular metal piece 12, the resistance value R of the eddy current can be reduced well
2。
Preferably, the semicircular metal plate 12 is made of one material of silver, silver alloy, copper, or copper alloy, and has a low resistivity to generate a large eddy current.
Preferably, the semicircular metal sheet 12 has a thickness of 0.1 mm to 2.0 mm.
It is worth mentioning that the external static magnetic field may interfere with the eddy current transformation. Preferably, the periphery of the printed circuit board 20 is provided with a magnetic shield 41, and the periphery of the partially metallized disk 10 is provided with a magnetic shield ring 42, so that the interference of an external static magnetic field can be shielded, and a large metering error can be avoided.
It is easily understood by those skilled in the art that the magnetic shield 41 and the magnetic shield ring 42 should be made of magnetic conductive material with high magnetic permeability (magnetic permeability should be more than 5000H/m). In addition, the magnetic shield ring 42 is subject to wading with the partially metallized disk 10, and therefore the magnetic shield ring 42 should be protected from corrosion by a coating of an anti-corrosive material.
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (7)
1. An eddy current electromechanical conversion device, comprising:
the device comprises a partially metallized disk, a printed circuit board, a plurality of induction coil pairs, an excitation device and a measuring device, wherein the partially metallized disk is suitable for being connected with an external rotating component to be tested and synchronously rotating;
the exciting device is electrically connected with the primary coil, the secondary coil is electrically connected with the measuring device, the primary coil and the secondary coil are coupled through mutual inductance, and the measuring device outputs a measuring signal according to the induction quantity change of the secondary coil.
2. The eddy current electromechanical conversion device according to claim 1, wherein the partially metallized disk includes a non-metallic disk and a semicircular metal piece that is provided on a surface of the non-metallic disk and is concentric with the non-metallic disk.
3. The eddy current electromechanical conversion device according to claim 2, wherein the semicircular metal piece is made of one of silver, a silver alloy, copper, or a copper alloy.
4. The eddy current electromechanical conversion device according to claim 2, wherein the thickness of the semicircular metal piece is 0.1 mm to 2.0 mm.
5. The eddy current electromechanical conversion device according to claim 1, wherein the number of the induction coil pairs is an odd number or an even number, and a central axis of each of the induction coil pairs coincides with a central axis of the partially metallized disk.
6. The eddy current electromechanical conversion device according to claim 1, wherein a magnetic shield is provided to a periphery of the printed circuit board.
7. Eddy current electromechanical conversion device according to claim 1, characterized in that the outer periphery of the partially metallized disc is provided with a magnetic shielding ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920882170.5U CN210051386U (en) | 2019-06-12 | 2019-06-12 | Electric eddy current electromechanical conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920882170.5U CN210051386U (en) | 2019-06-12 | 2019-06-12 | Electric eddy current electromechanical conversion device |
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| CN210051386U true CN210051386U (en) | 2020-02-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319898A (en) * | 2019-06-12 | 2019-10-11 | 宁波水表股份有限公司 | A kind of Retarder electrical switching device and method |
| CN112729438A (en) * | 2020-12-22 | 2021-04-30 | 连云港腾越电子科技有限公司 | Water flow direction detection device and method in water meter |
| CN114018351A (en) * | 2021-10-20 | 2022-02-08 | 新郦璞科技(上海)有限公司 | Electronic membrane type gas meter metering system based on eddy current induction principle |
-
2019
- 2019-06-12 CN CN201920882170.5U patent/CN210051386U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319898A (en) * | 2019-06-12 | 2019-10-11 | 宁波水表股份有限公司 | A kind of Retarder electrical switching device and method |
| CN112729438A (en) * | 2020-12-22 | 2021-04-30 | 连云港腾越电子科技有限公司 | Water flow direction detection device and method in water meter |
| CN114018351A (en) * | 2021-10-20 | 2022-02-08 | 新郦璞科技(上海)有限公司 | Electronic membrane type gas meter metering system based on eddy current induction principle |
| CN114018351B (en) * | 2021-10-20 | 2024-01-23 | 新郦璞科技(上海)有限公司 | Electronic diaphragm gas meter metering system based on eddy current induction principle |
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Address after: Hongxing Road Jiangbei District 315000 Zhejiang city of Ningbo province No. 355 Patentee after: Ningbo water meter (Group) Co.,Ltd. Address before: Hongxing Road Jiangbei District 315000 Zhejiang city of Ningbo province No. 355 Patentee before: NINGBO WATER METER Co.,Ltd. |