Inductance direct-reading character wheel device

Abstract

The invention relates to a technology for carrying out digital conversion on a mechanical register character wheel, in particular to a technology for carrying out digital positioning and coding on a character wheel angle by adopting a U-shaped magnetic core winding inductor as a sensor, the U-shaped magnetic core winding inductor carries out sensing by utilizing an electromagnetic field induction principle, and no light transmission requirement exists; the water meter has the advantages of being simple in structure, free of refraction and reflection phenomena caused by internal environment factors of the water meter, capable of completely adopting a waterproof treatment mode of a traditional electronic industry standard, namely high-density epoxy resin potting, enabling modules composed of components and a circuit board to be combined into a solid-state whole, and free of gaps. A photoelectric sensor which is low in technical content and not suitable for an underwater environment is not used any more, and an electromagnetic sensor which is more suitable for the underwater environment is adopted, so that the whole electronic module is simple and stable in process, greatly improved in waterproof standard, durable in use and suitable for popularization and application. The water meter is particularly suitable for being used in a wet-type water meter.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of digitization conversion of mechanical counter dial, especially using winding inductance as sensor to carry out dial angle digital positioning and coding, belongs to the metering instrument and apparatus technical field in Internet of Things system. BACKGROUND

[0002] Mechanical counter is mainly used in intelligent water meter, intelligent gas meter and other measuring instruments, as display and storage element of cumulative measurement data, the dial of mechanical counter belongs to mechanical structure, must use sensor to carry out digital positioning and coding to its rotation angle, so that computer can recognize and process the data displayed, the key of digitization conversion lies in the selection and structure design of sensor.

[0003] For digital positioning and coding of counter dial, the existing photoelectric direct reading technology is to use visible light or infrared light transceiver as sensor to construct, which is divided into two parts of emitting tube and receiving tube, and works by using light transmission and reflection principle. In dry water meter and gas meter, visible light or infrared light propagates in air environment, and is not affected by water, air bubbles and the refraction and reflection of different material joint interfaces, so that normal transmission and reception of light can be basically realized.

[0004] However, in wet water meter, light needs to propagate in water environment in water meter, and also needs to penetrate the blockage of internal waterproof structure such as plastic cavity wall. Under the joint action of water, air bubbles and plastic sheet of various materials, the conduction of light is greatly affected, and various refraction, reflection and attenuation make it difficult for light to be normally transmitted and received. In order to overcome these difficulties, various measures need to be taken in terms of material, process and structure to ensure that the light emitted by the emitting tube can be correctly received by the specified receiving tube.

[0005] Photoelectric direct reading technology has been used for thirty years, and for thirty years, the intelligent water meter industry has been trying various methods around photoelectric sensor. Various measures and methods are various, and now in the field of wet water meter, photoelectric direct reading is still an unfinished work. Many occasions use dry water meter, or directly give up direct reading and use pulse counting mode. For example, non-magnetic sensor counting is still essentially pulse counting, which cannot be powered off for a long time, cannot miss or miscount pulses, forms double metering with mechanical counter, and may cause inconsistent metering values after long-term use.

[0006] The internal environment of wet water meter is fixed, and light propagation needs to be clear and transparent. Photoelectric device and circuit board need to be waterproof, which is a big contradiction. In order to meet the requirement of transparency, the waterproof measures of components and circuit boards in water meter industry cannot use the effective standard method in electronic industry: epoxy resin potting, which greatly reduces the waterproof effect.

[0007] In order to thoroughly avoid this pair of contradictions, give up the low technical content of the photoelectric sensor, in the natural variety of various physical sensing principle when choosing the right technology, is the real solution. Do not use light sensor, natural without penetration, only need to do a good job of electronic components and circuit board waterproof can be in the electronics industry has very mature and reliable and widely used waterproof technology, even can be applied to more extreme more adverse environment than the water table inside. SUMMARY

[0008] The utility model patent "inductance sensor for mechanical meter dial positioning" with application number 2014200042851, proposes a non-photoelectric sensor, which uses electromagnetic induction principle to sense, without light transmission requirement, without refraction and reflection phenomenon caused by water table internal environment factors, can completely adopt the waterproof treatment way of traditional electronic industry standard: that is, using high density epoxy resin pouring, makes the module composed of components and circuit board all combine into a solid whole, without a crack, eliminates the possibility of water vapor penetrating into the module and eroding components and circuit board, greatly improves the waterproof effect, which is also the standard waterproof mode formed in the electronic industry for many years, widely used, and the effect is excellent.

[0009] The specific invention is: using the working principle of variable inductance, by dividing the guiding magnetic circuit into two parts, one is a fixed U-shaped magnetic core, which is wound with a coil to become an inductor, and the other is a movable ferrite tile, which is embedded in the circumference of the movable dial.

[0010] When the tile and the U-shaped core are combined together, the magnetic resistance of the magnetic circuit formed by the tile and the U-shaped core becomes smaller, and the inductance of the inductor composed of the U-shaped core and the coil becomes larger for the alternating current signal. When the tile and the U-shaped core are separated, the magnetic resistance of the magnetic circuit formed by the U-shaped core itself becomes larger, and the inductance of the inductor composed of the U-shaped core and the coil becomes smaller for the alternating current signal. By measuring the size of the inductance through electronic circuit, the distance between the tile and the U-shaped core can be detected, and under the premise that the relative installation position structure of the U-shaped core and the tile is known, the rotation angle position of the dial can also be detected.

[0011] The magnetic permeability of the U-shaped core is basically the same for water, air, plastic, impurities in water and other non-magnetic materials within the normal temperature range, so the inductance change law of the U-shaped core inductance is exactly the same in water and in air, and the tile and the core rely on electromagnetic field sensing without the need for transparency, so only the waterproof measures of the electronic circuit are needed to work normally.

[0012] DRAWINGS Figure 3is the relative position installation schematic diagram of U-shaped magnetic core inductance and the word wheel, in the figure, multiple U-shaped magnetic core inductances (1) are spaced according to a fixed angle, and are surrounded along the concentric circle arc of the word wheel circumference, the two legs of each U-shaped magnetic core inductance (1) straddle on both sides of the radial plane of the word wheel (4), when the word wheel (4) rotates, the magnetic tile (3) will enter or leave the position between the two legs of the U-shaped magnetic core (1), when the magnetic tile (3) is between the two legs of the U-shaped magnetic core (1), the inductance of the U-shaped magnetic core coil becomes large, when the magnetic tile (3) leaves the position between the two legs of the U-shaped magnetic core (1), the inductance of the U-shaped magnetic core coil becomes small, through the measurement of the inductance change of each U-shaped magnetic core coil inductance by the electronic circuit, the word wheel can be angularly positioned and coded.

[0013] A single word wheel can only indicate a single digit, and when expressing multiple digits such as individual, ten, hundred, and thousand digits, multiple word wheels are needed, and the structure of the word wheel is fixed together in multiple groups in parallel, thus forming an inductance direct reading module of multiple digits. Figure 3

[0014] The plastic frame (5) is used as an installation framework, which is used to place the word wheel (4) and install the U-shaped magnetic core inductance (1), and at the same time ensures the relative matching position requirement of the two, and also serves as a container for sealing glue for waterproof and dustproof, achieving multiple purposes at once.

[0015] The significance and advantages of the inductance direct reading word wheel device are as follows:

[0016] Instead of using photoelectric sensors with low technical content and not suitable for underwater environment, electromagnetic sensors more suitable for underwater environment are adopted, so that the process of the overall electronic module is simple and stable, waterproof standard electronic module waterproof measures are adopted, and the device is durable and waterproof, and the waterproof effect is self-evident, which can be used for both dry water meter and wet water meter. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic diagram of the U-shaped magnetic core in the device.

[0018] Figure 2 It is a structure schematic diagram of the U-shaped magnetic core inductance formed by winding a coil on the U-shaped magnetic core in the device.

[0019] Figure 3 It is a structure schematic diagram of the cooperation and installation of the word wheel and the U-shaped magnetic core inductance in the device.

[0020] Figure 4 It is a structure schematic diagram of the inner part of the plastic frame in the device.

[0021] Figure 5 It is a structure schematic diagram of the outer part of the plastic frame in the device.

[0022] Figure 6 ​It is the structure diagram of the device when the partial word wheel is placed in the arc-shaped groove of the plastic frame.

[0023] Figure 7 It is the structure diagram of the device when the U-shaped magnetic core inductor and the circuit board are installed in the plastic frame.

[0024] Figure 8 It is the structure diagram of the device after the plastic frame is filled with the potting glue.

[0025] In the figure, the component names and serial numbers are as follows: 1-U-shaped magnetic core inductor, 101-U-shaped magnetic core, 102-coil, 3-magnetic tile, 4-word wheel, 5-plastic frame, 501-arc-shaped groove, 502-arc-shaped convex edge, 503-arc-shaped trench, 6-electronic circuit board, and 7-potting glue. DETAILED DESCRIPTION

[0026] The embodiments of the device will be described in detail below with reference to the accompanying drawings:

[0027] The present application is an inductance direct-reading word wheel device, which comprises a plastic frame (5), a word wheel (4) inlaid with magnetic tiles (3), a U-shaped magnetic core inductor (1), an electronic circuit board (6), waterproof and dustproof potting glue (7), the word wheel (4) is placed in the arc-shaped groove (501) on the 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 interior of the plastic frame (5), and the interior of the plastic frame is filled with the potting glue (7) to form a solid whole after the installation is completed.

[0028] In the device, there is an arc-shaped trench (503) on the bottom surface of the plastic frame (5) from left to right, a plurality of arc-shaped grooves (501) are further dug along the arc-shaped trench (503), the center axis of each arc-shaped groove (501) is the same as the center axis of the arc-shaped trench (503), the arc-shaped groove (501) is arc-shaped on the bottom surface of the frame, the arc-shaped convex edge (502) is arc-shaped on the bottom surface of the frame, and the arc-shaped convex edge (502) and the arc-shaped groove (501) belong to the same shape structure of the inner and outer surfaces.

[0029] In the device, the magnetic tiles (3) are inlaid on the circumference of the word wheel (4), and a plurality of magnetic tiles are inlaid according to different coding requirements and corresponding intervals.

[0030] In the device, the center axis of the word wheel (4) is the same as the center axis of the arc-shaped groove (501) on the bottom surface of the plastic frame (5).

[0031] In the device, the coil (102) is wound on the horizontal axis of the U-shaped magnetic core (101) to form the U-shaped magnetic core inductor (1).

[0032] In the device, a plurality of U-shaped magnetic core inductors (1) inside the plastic frame (5) are arranged at intervals along the arc of the circular-arc convex ridge (502), and the two legs of each U-shaped magnetic core inductor (1) straddle the two sides of the radial plane of the circular-arc convex ridge (502).

[0033] In the device, a wheel (4) is used to represent each digit bit of the counter, and one wheel (4) corresponds to one circular-arc groove (501). The number of digit bits of the counter is equal to the number of circular-arc grooves (501).

[0034] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification or equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An inductive direct-reading character wheel device, characterized in that: The entire device consists of a plastic frame (5), a character wheel (4) inlaid with magnetic tiles (3), a U-shaped magnetic core inductor (1), an electronic circuit board (6), and waterproof and dustproof potting compound (7). The character wheel (4) is placed in the arc-shaped groove (501) on the bottom surface of the plastic frame (5). The electronic circuit board (6) and multiple U-shaped magnetic core inductors (1) are installed inside the plastic frame (5). After installation, the inside of the plastic frame is filled with potting compound (7) to form a solid whole.

2. The inductive direct-reading character wheel device according to claim 1, characterized in that: The bottom surface of the plastic frame (5) has an arc-shaped groove (503) from left to right. Along the arc-shaped groove (503), multiple arc-shaped grooves (501) are dug. The central axis of each arc-shaped groove (501) is the same as the central axis of the arc-shaped groove (503). When viewed from the bottom surface outside the frame, it is an arc-shaped groove (501). When viewed from the bottom surface inside the frame, it is an arc-shaped convex ridge (502). The arc-shaped convex ridge (502) and the arc-shaped groove (501) are the inner and outer surfaces of the same shape structure.

3. The inductive direct-reading character wheel device according to claim 1, characterized in that: The magnetic tile (3) is inlaid on the periphery of the character wheel (4), and multiple magnetic tiles are inlaid according to different coding requirements and corresponding intervals.

4. The inductive direct-reading character wheel device according to claim 1, characterized in that: The central axis of the character wheel (4) is the same as the central axis of the arc-shaped groove (501) on the bottom surface of the plastic frame (5).

5. The inductive direct-reading character wheel device according to claim 1, characterized in that: By winding a coil (102) on the horizontal axis of the U-shaped magnetic core (101), a U-shaped magnetic core inductor (1) is formed.

6. The inductive direct-reading character wheel device according to claim 1, characterized in that: Multiple U-shaped magnetic core inductors (1) inside the plastic frame (5) are arranged at certain intervals along the arc of the arc-shaped convex ridge (502), with the two legs of each U-shaped magnetic core inductor (1) straddling both sides of the radial plane of the arc-shaped convex ridge (502).

7. The inductive direct-reading character wheel device according to claim 1, characterized in that: Each digit of the counter is represented by a digit wheel (4), and one digit wheel (4) corresponds to one arc-shaped groove (501). The number of digits of the counter is equal to the number of arc-shaped grooves (501).

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