CN220893486U - Inductance direct-reading character wheel device - Google Patents
Inductance direct-reading character wheel device Download PDFInfo
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- CN220893486U CN220893486U CN202321482092.2U CN202321482092U CN220893486U CN 220893486 U CN220893486 U CN 220893486U CN 202321482092 U CN202321482092 U CN 202321482092U CN 220893486 U CN220893486 U CN 220893486U
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- magnetic core
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Abstract
The invention relates to a technology for digitally converting a character wheel of a mechanical counter, in particular to a technology for digitally positioning and coding the angle of the character wheel by adopting a U-shaped magnetic core winding inductor as a sensor, wherein the U-shaped magnetic core inductor senses by utilizing an electromagnetic field induction principle, has no light transmission requirement, has no refraction and reflection phenomenon generated by internal environment factors of a water meter, can completely adopt a traditional waterproof treatment mode of electronic industry standard, namely, a high-density epoxy resin encapsulation mode, enables modules formed by components and a circuit board to be completely combined into a solid whole without a wire gap, avoids the possibility of water vapor penetrating into the modules to erode the components and the circuit board, and adopts an electromagnetic sensor which is more suitable for the water environment because the technology content is low, so that the technology of the whole electronic module is simple and stable, the waterproof standard is greatly improved, and the technology is durable, and the technology is particularly suitable for being used in a wet water meter.
Description
Technical Field
The invention relates to a technology for digitally converting a character wheel of a mechanical counter, in particular to a technology for digitally positioning and coding the angle of the character wheel by taking a winding inductance as a sensor, belonging to the technical field of metering instruments in an Internet of things system.
Background
The character wheel of the mechanical counter belongs to a mechanical structure, and a sensor is required to be used for carrying out digital positioning and coding on the rotation angle of the character wheel, so that a computer can identify and process the displayed data, and the key of digital conversion is the selection and structural design of the sensor.
The digital positioning and coding are carried out on the character wheel of the register, the existing photoelectric direct reading technology is constructed by adopting a visible light ray or infrared light ray receiving and transmitting device as a sensor and is divided into a transmitting tube and a receiving tube, the two parts work by utilizing the correlation and reflection principles of light rays, in a dry water meter and a gas meter, the visible light ray or infrared light ray propagates in an air environment and is not influenced by refraction and reflection of water, bubbles and different material connection interfaces, and the normal receiving and transmitting of the light rays can be basically realized.
However, in a wet water meter, light needs to propagate in a water environment in the water meter, and the light is greatly influenced by the combined action of various materials such as water, bubbles and plastic sheets through the blocking of an internal waterproof structure such as a plastic cavity wall, so that the normal receiving and transmitting of the light are difficult due to various refraction, reflection and attenuation.
The development of photoelectric direct reading technology has been carried out for three decades, various attempts are continuously carried out around a photoelectric sensor in the intelligent water meter industry for three years, various measures and methods are carried out around the photoelectric sensor, photoelectric direct reading is still an unfinished business in the wet water meter field until now, many occasions are to replace a dry water meter, or direct reading is abandoned and a pulse counting mode is adopted, for example, nonmagnetic sensing counting which basically still belongs to pulse counting cannot be carried out, power cannot be lost in the last month, pulse cannot be missed to be counted, double metering is formed with a mechanical meter, and the problem that the metering values of the two are inconsistent can occur after long-term use.
The internal environment of the wet water meter is fixed, and light rays are required to be transmitted clearly, and the photoelectric device and the circuit board thereof are required to be waterproof, which is a pair of great contradictions. In order to meet the transparent requirements, waterproof measures of components and circuit boards in the water meter industry cannot be adopted by the effective standard practice in the electronic industry: the epoxy resin is filled and sealed, and the waterproof effect is greatly reduced.
In order to thoroughly avoid the contradiction, the photoelectric sensor with low technical content is abandoned, and a proper technology is selected from various physical sensing principles in the nature, so that the photoelectric sensor is a real solution. The water-proof device does not need to use optical line sensing, is naturally not transparent, only needs to be waterproof for electronic components and circuit boards, has a very mature, reliable and widely used waterproof technology in the electronic industry, and can be even applied to the environment which is extremely worse than the inside of the water meter.
Disclosure of Invention
In the long-term sensor technology research, the inventor provides a non-photoelectric sensor which uses an electromagnetic field induction principle to conduct sensing, has no light transmission requirement and no refraction and reflection phenomenon generated by internal environmental factors of a water meter, and can completely adopt a traditional waterproof treatment mode of electronic industry standard: the high-density epoxy resin is used for encapsulation, so that the modules formed by the components and the circuit board are all combined into a solid whole, a wire gap is not reserved, the possibility that water permeates into the modules to erode the components and the circuit board is eliminated, the waterproof effect is greatly improved, and the waterproof module is a standard waterproof mode formed by the electronic industry for many years, and is widely applied and excellent in effect.
The specific invention is as follows: by utilizing the working principle of the variable inductor, the ferrite core of the guiding magnetic circuit is divided into two parts, one part is a fixed U-shaped core, a coil is wound to form an inductor, and the other part is a movable ferrite magnetic shoe which is embedded on the circumferential surface of a movable character wheel.
When the magnetic shoe and the U-shaped magnetic core are combined together, the magnetic circuit reluctance formed by the magnetic shoe and the U-shaped magnetic core is reduced, and the inductance formed by the U-shaped magnetic core and the coil is increased in inductance presented to an alternating current signal. When the magnetic shoe and the U-shaped magnetic core are separated, the magnetic circuit reluctance formed by the U-shaped magnetic core is increased, and the inductance of the inductance formed by the U-shaped magnetic core and the coil is reduced to the inductance of the alternating current signal. The electronic circuit is used for measuring the inductance, so that the distance between the magnetic shoe and the U-shaped magnetic core can be detected, and the rotating angle position of the character wheel can be detected on the premise that the relative installation position structure of the U-shaped magnetic core and the magnetic shoe is known.
The magnetic permeability of the U-shaped magnetic core is basically the same in the normal temperature range of non-magnetic conductive materials such as water, air, plastics, impurities in water and the like, so that the change rule of the inductance of the U-shaped magnetic core is completely the same in water and air, the magnetic shoe and the magnetic core are sensed by the electromagnetic field, no transparency is needed, and the U-shaped magnetic core can work normally only by taking waterproof measures of an electronic circuit.
In the description, fig. 3 is a schematic diagram of the installation of the relative positions of the U-shaped magnetic core inductors and the character wheel, wherein a plurality of U-shaped magnetic core inductors (1) are arranged at intervals according to a fixed angle, the U-shaped magnetic core inductors are wound along the circumference of the character wheel according to the radian of concentric circles of the U-shaped magnetic core inductors, two legs of each U-shaped magnetic core inductor (1) are straddled on two sides of a radial plane of the character wheel (4), when the character wheel (4) inlaid with the magnetic shoe (3) rotates, the magnetic shoe (3) enters or leaves the position between the two legs of the U-shaped magnetic core (1), when the magnetic shoe (3) is positioned between the two legs of the U-shaped magnetic core (1), the inductance of a U-shaped magnetic core coil is increased, and when the magnetic shoe (3) leaves the position between the two legs of the U-shaped magnetic core coil is decreased, and the character wheel can be positioned and encoded by measuring the inductance change of the inductance of each U-shaped magnetic core coil inductor through an electronic circuit.
When a single character wheel only can indicate one digit and expresses a plurality of digits such as ten digits, hundred digits and thousand digits, a plurality of character wheels are needed, and the structure shown in figure 3 is parallelly fixed together in a plurality of groups, so that the inductance direct-reading module of the multi-digit digits is formed.
The plastic frame (5) is used as an installation framework, is used for placing the character wheel (4) and also is used for installing the U-shaped magnetic core inductor (1), meanwhile, the relative matching position requirement of the character wheel and the U-shaped magnetic core inductor is guaranteed, and the U-shaped magnetic core inductor is used as a container for filling, sealing, water proofing and dust proofing sealant, so that multiple purposes are achieved.
The meaning and advantage that inductance direct-reading word wheel device produced lie in:
The photoelectric sensor with low technical content and unsuitable for the underwater environment is not used any more, and the electromagnetic sensor which is more suitable for the underwater environment is adopted, so that the process of the whole electronic module is simple and stable, the standard electronic module waterproof measure is adopted for waterproof, the waterproof effect is durable, and the waterproof effect is undoubted, and the waterproof device can be used no matter a dry type water meter or a wet type water meter.
Drawings
Fig. 1 is a schematic structural diagram of a U-shaped magnetic core in the present device.
Fig. 2 is a schematic structural diagram of a U-shaped core inductor formed by winding a U-shaped core around a coil in the present apparatus.
Fig. 3 is a schematic structural diagram of the device in which the character wheel and the U-shaped magnetic core are mounted in an inductive fit manner.
Fig. 4 is a schematic view of the structure of the plastic frame in the present device.
Fig. 5 is a schematic view of the structure of the outer part of the plastic frame in the device.
Fig. 6 is a schematic view of the structure of the device when a part of character wheel is placed in the groove on the outer bottom surface of the plastic frame.
Fig. 7 is a schematic diagram of the structure of the device when the U-shaped magnetic core inductor and the circuit board are mounted in the plastic frame.
Fig. 8 is a schematic structural view of the plastic frame in the device after filling pouring sealant.
Part name and number in the figure: 1-U-shaped magnetic core inductance, 101-U-shaped magnetic core, 102-coil, 3-magnetic shoe, 4-character wheel, 5-plastic frame, 501-arc-shaped groove, 502-arc-shaped convex rib, 503-arc-shaped ditch, 6-electronic circuit board and 7-pouring sealant.
Detailed Description
Embodiments of the present device will be described in detail below with reference to the attached drawings:
The invention relates to an inductance direct-reading character wheel device which comprises a plastic frame (5), character wheels (4) embedded with magnetic shoes (3), U-shaped magnetic core inductors (1), an electronic circuit board (6), waterproof dustproof pouring sealant (7), wherein the character wheels (4) are arranged in arc grooves (501) on the outer bottom surface of the plastic frame (5), the electronic circuit board (6) and a plurality of U-shaped magnetic core inductors (1) are arranged in the plastic frame (5), and after the installation is completed, the pouring sealant (7) is filled in the plastic frame to form a solid whole.
In the device, a circular arc-shaped ditch (503) is formed in the bottom surface of a plastic frame (5) from left to right, a plurality of circular arc-shaped grooves (501) are deeply dug along the circular arc-shaped ditch (503), the center axis of each circular arc-shaped groove (501) and the center axis of the circular arc-shaped ditch (503) are the same axis, the circular arc-shaped groove (501) is seen at the outer bottom surface of the frame, the circular arc-shaped convex rib (502) is seen at the inner bottom surface of the frame, and the circular arc-shaped convex rib (502) and the circular arc-shaped groove (501) belong to the inner surface and the outer surface of the same shape structure.
In the device, the magnetic shoes (3) are embedded on the circumference of the character wheel (4), and a plurality of magnetic shoes are embedded according to different coding requirements and corresponding intervals.
In the device, the center axis of the character wheel (4) and the center axis of the arc-shaped groove (501) on the outer bottom surface of the plastic frame (5) are the same axis.
In the device, a U-shaped magnetic core inductor (1) is formed by winding a coil (102) on the transverse axis of a U-shaped magnetic core (101).
In the device, a plurality of U-shaped magnetic core inductors (1) in a plastic frame (5) are arranged along the radian of an arc-shaped rib (502) at certain intervals, and two legs of each U-shaped magnetic core inductor (1) are straddled on two sides of the radial plane of the arc-shaped rib (502).
In the device, each digital digit of the counter is represented by a character wheel (4), one character wheel (4) corresponds to one circular arc-shaped groove (501), and the digital digits of the counter are equal to the number of the circular arc-shaped grooves (501).
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (7)
1. An inductance direct-reading character wheel device is characterized in that: the whole device comprises a plastic frame (5), a character wheel (4) embedded with a magnetic shoe (3), a U-shaped magnetic core inductor (1), an electronic circuit board (6) and waterproof dustproof pouring sealant (7), wherein the character wheel (4) is placed in an arc-shaped groove (501) on the outer bottom surface of the plastic frame (5), the electronic circuit board (6) and the plurality of U-shaped magnetic core inductors (1) are installed in the plastic frame (5), and after the installation is completed, the pouring sealant (7) is used for filling the inside of the plastic frame to form a solid whole.
2. The inductance direct-reading character wheel device according to claim 1, wherein: the bottom surface of the plastic frame (5) is provided with a circular arc-shaped ditch (503) from left to right, a plurality of circular arc-shaped grooves (501) are deeply dug along the circular arc-shaped ditch (503), the center axis of each circular arc-shaped groove (501) and the center axis of the circular arc-shaped ditch (503) are the same axis, the circular arc-shaped groove (501) is seen at the bottom surface of the frame, the circular arc-shaped convex rib (502) is seen at the bottom surface of the frame, and the circular arc-shaped convex rib (502) and the circular arc-shaped groove (501) belong to the inner surface and the outer surface of the same shape structure.
3. The inductance direct-reading character wheel device according to claim 1, wherein: the magnetic shoes (3) are embedded on the circumference of the character wheel (4), and a plurality of magnetic shoes are embedded according to different coding requirements and corresponding intervals.
4. The inductance direct-reading character wheel device according to claim 1, wherein: the center axis of the character wheel (4) and the center axis of the circular arc groove (501) on the outer bottom surface of the plastic frame (5) are the same axis.
5. The inductance direct-reading character wheel device according to claim 1, wherein: a U-shaped core inductance (1) is formed by winding a coil (102) around the transverse axis of the U-shaped core (101).
6. The inductance direct-reading character wheel device according to claim 1, wherein: the U-shaped magnetic core inductors (1) in the plastic frame (5) are arranged along the radian of the circular arc-shaped convex rib (502) at certain intervals, and two legs of each U-shaped magnetic core inductor (1) are straddled on two sides of the radial plane of the circular arc-shaped convex rib (502).
7. The inductance direct-reading character wheel device according to claim 1, wherein: each digital digit of the counter is represented by a character wheel (4), one character wheel (4) corresponds to one circular arc groove (501), and the number of the digital digits of the counter is equal to that of the circular arc grooves (501).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321482092.2U CN220893486U (en) | 2023-06-12 | 2023-06-12 | Inductance direct-reading character wheel device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321482092.2U CN220893486U (en) | 2023-06-12 | 2023-06-12 | Inductance direct-reading character wheel device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220893486U true CN220893486U (en) | 2024-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321482092.2U Active CN220893486U (en) | 2023-06-12 | 2023-06-12 | Inductance direct-reading character wheel device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220893486U (en) |
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2023
- 2023-06-12 CN CN202321482092.2U patent/CN220893486U/en active Active
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