阅读说明：本技术 双空心线圈燃气表无磁取信装置及其取信方法、燃气表 (Nonmagnetic signal taking device and method for double-hollow-coil gas meter and gas meter ) 是由 李亚亮 邓立斌 金永利 祝艳婷 王�琦 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种双空心线圈燃气表无磁取信装置及其取信方法、燃气表,所述取信装置至少包括圆盘和金属棒,圆盘的圆周上设有齿轮,圆盘上固定有圆轴,金属棒的中间设有与金属棒的长度方向相垂直的椭圆槽孔,圆盘设置于燃气表的基表上并与基表的输出齿轮相啮合,金属棒的两端分别通过固定件设置于基表上,两端的固定件上均绕有线圈且线圈的引出线与燃气表的电路板连接,所述圆轴穿设于椭圆槽孔中；当气体流过基表时,通过基表的输出齿轮转动带动圆盘转动从而带动圆轴在椭圆槽孔中沿其长度方向往复运动进而带动金属棒在两个固定件中交替往复运动。该取信装置有效避免了传统双干簧管和双霍尔元方式的磁干扰,以及光电取信的光干扰问题。(The invention discloses a double-hollow coil gas meter non-magnetic letter taking device, a letter taking method and a gas meter, wherein the letter taking device at least comprises a disc and a metal rod, gears are arranged on the circumference of the disc, a circular shaft is fixed on the disc, an oval slot hole vertical to the length direction of the metal rod is formed in the middle of the metal rod, the disc is arranged on a base meter of the gas meter and meshed with an output gear of the base meter, two ends of the metal rod are respectively arranged on the base meter through fixing pieces, coils are wound on the fixing pieces at the two ends, lead-out wires of the coils are connected with a circuit board of the gas meter, and the circular shaft penetrates through the oval slot hole; when the gas flows through the base meter, the output gear of the base meter rotates to drive the disc to rotate, so that the circular shaft is driven to reciprocate in the elliptical groove hole along the length direction of the elliptical groove hole, and the metal rod is driven to reciprocate in the two fixing pieces alternately. The device effectively avoids the magnetic interference of the traditional double reed switches and double Hall elements and the problem of optical interference of photoelectric signal acquisition.)

1. A double-hollow-coil gas meter non-magnetic signal obtaining device is characterized by at least comprising a disc (3) and a metal rod (4), wherein gears are arranged on the circumference of the disc (3), a circular shaft (31) is fixed on the disc (3), an oval slot (41) perpendicular to the length direction of the metal rod is arranged in the middle of the metal rod (4), the disc (3) is arranged on a base meter of a gas meter and meshed with an output gear of the base meter, two ends of the metal rod (4) are respectively arranged on the base meter through fixing pieces (1), coils (2) are wound on the fixing pieces (1) at the two ends, leading-out wires of the coils are connected with a circuit board of the gas meter, and the circular shaft (31) penetrates through the oval slot (41); when gas flows through the base meter, the output gear of the base meter rotates to drive the disc (3) to rotate, so that the circular shaft (31) is driven to reciprocate in the elliptical groove hole (41) along the length direction of the circular shaft, and the metal rod (4) is driven to reciprocate alternately in the two fixing pieces (1).

2. The non-magnetic signal acquisition device of the double-hollow-coil gas meter according to claim 1, wherein the fixing member (1) and the disk (3) are made of non-magnetic materials.

3. The non-magnetic signal acquisition device of the double-hollow-coil gas meter according to claim 2, wherein the fixing member (1) and the disk (3) are made of plastic.

4. The non-magnetic information obtaining device of the double-hollow-coil gas meter according to claim 1, characterized in that the outer surface of the fixing piece (1) is provided with a groove (11) for winding a coil, and the fixing piece is provided with a through hole (12) matched with the shape of the metal rod (4) along the central axis so that the metal rod can reciprocate in the two fixing pieces alternately.

5. The non-magnetic information obtaining device of the double-hollow-coil gas meter according to claim 4, wherein the metal rod (4) is cylindrical, the cross section of the through hole (12) is circular, and the diameter of the through hole (12) is slightly larger than that of the metal rod (4).

6. The double hollow coil gas meter non-magnetic signal obtaining device according to claim 1, wherein the length of the oval slot hole (41) is greater than or equal to the diameter of the circle where the circular shaft (31) is located.

7. The method for acquiring the information of the double-hollow-coil gas meter without the magnetic information acquiring device according to any one of claims 1 to 6, characterized by at least comprising the following steps:

s1, when gas flows through the base meter, the output gear of the base meter rotates to drive the disc (3) to do circular motion;

s2, the circular shaft (31) is driven by the disc to do circular motion, and meanwhile, the circular shaft reciprocates in the elliptical slot hole (41) along the length direction of the elliptical slot hole;

s3, the metal bar (4) reciprocates in the two fixed pieces (1);

s4, setting the two ends of the metal rod (4) as a first end and a second end respectively, when the first end of the metal rod (4) moves into the fixing piece (1) close to the first end of the metal rod, the metal rod completely penetrates into the coil (2) close to the first end of the metal rod, and an excitation signal received by the first end of the metal rod is in a strongest over-damping state and is output without pulse after being processed by a circuit; meanwhile, the second end of the metal rod (4) is completely separated from the interior of the coil (2) close to the second end of the metal rod, an excitation signal received by the second end of the metal rod is in a strongest underdamping state, and pulse output is realized after the excitation signal is processed by a circuit.

8. The credit acquisition method according to claim 7, characterized in that, every time the disk (3) rotates for one circle, the two coils (2) alternately enter an over-damping state and an under-damping state to realize the electromechanical signal conversion of the gas meter.

9. A gas meter, which at least comprises a base meter, and is characterized by further comprising a double hollow coil gas meter non-magnetic signal acquisition device according to any one of claims 1 to 6, or a gas flow metering method according to claim 7 or 8.

Technical Field

The invention relates to the technical field of meter metering, in particular to a double-hollow-coil gas meter non-magnetic signal obtaining device, a signal obtaining method and a gas meter.

Background

At present, the common measurement and acquisition modes of the gas meter mainly comprise a double reed pipe mode, a double Hall element mode, a photoelectric signal acquisition mode and the like. The double reed switch and the double Hall element are easy to be disturbed by a magnetic field to generate false counting in a signal acquisition mode; similarly, the photoelectric signal acquisition will be interfered by light to generate false counting, and the requirement for the light shielding performance of the housing is high.

In the prior art, the inductance value is improved by using the ferrite core, and the magnetic induction lines are gathered to realize the detection of the external metal, but the ferrite core is easily saturated by an external magnetic field to lose the effect, namely the problem of magnetic interference cannot be avoided, and the detection is not as simple as that of a Hall sensor.

Chinese patent publication No. CN111998904A discloses a non-magnetic metering device, in which a circuit is wound into a circular cake shape on a PCB and used as an inductor to increase the relative area with a metal object, but because the inductance is very low and the oscillation frequency is very high, the requirements on the circuit and software processing algorithm are very high, a special MCU is required for processing, and a general whole meter manufacturer cannot realize the measurement by itself, needs to purchase a module, and has uncontrollable cost.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the non-magnetic information acquiring device of the double-hollow coil gas meter, which has the advantages of simple structure, easy realization and strong reliability, and effectively avoids the problems of magnetic interference of the traditional double-reed pipe and double-Hall element modes and optical interference of photoelectric information acquisition. The invention also provides a message taking method of the double-hollow-coil gas meter non-magnetic message taking device and the gas meter.

Interpretation of terms:

1. electromechanical signal conversion: and converting the mechanical rotation signal of the base meter into an electric signal which can be collected and processed.

2. An over-damping state: the metal rod is in an over-damped state when it moves inside the air coil.

3. An underdamped state: when the metal rod moves out of the hollow coil, the metal rod is in an underdamped state.

The technical scheme adopted by the invention for overcoming the technical problems is as follows:

a double hollow coil gas meter non-magnetic signal obtaining device at least comprises a disc and a metal rod, wherein gears are arranged on the circumference of the disc, a circular shaft is fixed on the disc, an elliptical slot hole perpendicular to the length direction of the metal rod is formed in the middle of the metal rod, the disc is arranged on a base meter of the gas meter and meshed with an output gear of the base meter, two ends of the metal rod are respectively arranged on the base meter through fixing pieces, coils are wound on the fixing pieces at the two ends, leading-out wires of the coils are connected with a circuit board of the gas meter, and the circular shaft penetrates through the elliptical slot hole; when the gas flows through the base meter, the output gear of the base meter rotates to drive the disc to rotate, so that the circular shaft is driven to reciprocate in the elliptical groove hole along the length direction of the elliptical groove hole, and the metal rod is driven to reciprocate in the two fixing pieces alternately.

Furthermore, the fixing piece and the disc are made of non-magnetic materials, so that interference on the letter taking process is avoided.

Furthermore, the fixing piece and the disc are made of plastic, and the plastic is low in price, light in weight and easy to process.

Furthermore, the outer surface of the fixing piece is provided with a groove for winding a coil, and the fixing piece is provided with a through hole matched with the shape of the metal rod along the central axis so that the metal rod can reciprocate in the two fixing pieces alternately.

Furthermore, the metal rod is cylindrical, the cross section of the through hole is circular, and the diameter of the through hole is slightly larger than that of the metal rod.

Furthermore, the length of the oval slot is larger than or equal to the diameter of a circle where the circular shaft is located.

The invention also provides a message taking method of the double-hollow-coil gas meter non-magnetic message taking device, which at least comprises the following steps:

s1, when gas flows through the base meter, the output gear of the base meter rotates to drive the disc to do circular motion;

s2, the circular shaft is driven by the disc to do circular motion, and meanwhile, the circular shaft does reciprocating motion in the elliptical slot hole along the length direction of the elliptical slot hole;

s3, the metal bar reciprocates in the two fixed pieces;

s4, setting the two ends of the metal rod as a first end and a second end respectively, when the first end of the metal rod moves into the fixing piece close to the first end of the metal rod, the metal rod completely penetrates into the coil close to the first end of the metal rod, and an excitation signal received by the first end of the metal rod is in a strongest over-damping state and is output without pulse after being processed by a circuit; meanwhile, the second end of the metal rod is completely separated from the inside of the coil close to the second end of the metal rod, the excitation signal received by the second end of the metal rod is in the strongest underdamping state, and pulse output is realized after the excitation signal is processed by a circuit.

Further, every time the disc rotates for one circle, the two coils alternately enter an over-damping state and an under-damping state, and therefore electromechanical signal conversion of the gas meter is achieved.

The invention also provides a gas meter which at least comprises a base meter and the double-hollow-coil non-magnetic signal acquiring device or the signal acquiring method is used for gas flow measurement.

The invention has the beneficial effects that:

1. the invention converts the circular motion of the output gear of the base meter into the reciprocating motion of the metal rod through a mechanical structure, so that the two hollow coils alternately enter an over-damping state and an under-damping state, and the electromechanical conversion is realized through circuit post-processing, thereby greatly increasing the comparison of the under-damping oscillation intensity and the over-damping oscillation intensity.

2. The invention has simple structure, easy realization and strong reliability, and effectively avoids the magnetic interference of the traditional double reed switches and double Hall elements and the optical interference problem of photoelectric signal acquisition.

3. The structure of the invention ensures that the circuit processing is simple, the special MCU is not needed for processing, the master control MCU of the whole gas meter is directly used, and the cost is lower.

4. The invention still adopts a mode of alternating two signals, the main logic of the existing Hall signal-taking software algorithm is unchanged, and the software transplantation is convenient.

Drawings

Fig. 1 is a schematic structural diagram of a non-magnetic signal acquisition device of a double-hollow coil gas meter according to an embodiment of the invention.

In the figure, 1, a fixing piece, 11, a groove, 12, a through hole, 2, a coil, 3, a disc, 31, a circular shaft, 4, a metal rod, 41 and an oval slot hole.

Detailed Description

In order to facilitate a better understanding of the invention for those skilled in the art, the invention will be described in further detail with reference to the accompanying drawings and specific examples, which are given by way of illustration only and do not limit the scope of the invention.

Examples 1,

As shown in fig. 1, the non-magnetic signal obtaining device for a double-hollow coil gas meter according to this embodiment at least includes a fixing member 1, a coil 2, a disk 3, and a metal rod 4.

The outer surface of the fixing piece 1 is provided with a groove 11, the groove 11 is convenient for winding the coil 2, and the coil wound on the groove 11 is not easy to separate from the fixing piece; the fixing piece 1 is hollow, is provided with a through hole 12 matched with the shape of the metal rod 4 along the central axis, and can bear the metal rod 4 to reciprocate.

The leading-out wires of the two coils 2 are connected with a circuit board of the gas meter, and a master control MCU of the whole gas meter is arranged on the circuit board of the gas meter, specifically, the leading-out wires of the two coils 2 are connected with the master control MCU of the gas meter after passing through a signal conditioning circuit, and the signal conditioning circuit is not an innovation point of the invention, and only an existing signal conditioning circuit structure is adopted, and the description is not provided herein.

The circumference of the disk 3 is provided with a gear, the gear of the disk is meshed with an output gear of a gas meter base meter, and a circular shaft 31 is fixed on one surface of the disk 3 close to the edge.

The two ends of the metal rod 4 can be inserted into the through holes 12 of the fixing member 1, the middle of the metal rod 4 is provided with an elliptical slot hole 41 which is vertical to the length direction of the metal rod, and the circular shaft 31 can be inserted into the elliptical slot hole 41.

In this embodiment, the fixing member 1 and the disc 3 are made of a non-magnetic material, and it is further preferable that the fixing member 1 and the disc 3 are made of a plastic material, which is low in price, light in weight, and easy to process.

The metal rod 4 is preferably cylindrical, and accordingly, the cross section of the through hole 12 is circular, and the diameter of the through hole 12 is slightly larger than that of the metal rod 4, so that the metal rod 4 can be inserted into the through hole 12 of the fixing member and freely reciprocate.

Preferably, the length of the oval slot 41 is equal to or greater than the diameter of the circle on which the circular shaft 31 is located.

In the structure of the non-magnetic signal acquiring device of the double-hollow-coil gas meter in this embodiment, as shown in fig. 1, first, a disk 3 is fixed on a base meter of the gas meter, specifically, in a housing outside the base meter, and the disk 3 is engaged with an output gear of the base meter; then, fixing a fixing piece 1 wound with a coil 2 with the base table, specifically fixing the fixing piece in a shell outside the base table; inserting one end of a metal rod 4 into the fixed fixing piece 1, inserting the circular shaft 31 on the disc 3 into the elliptical slot hole 41, and sleeving the other fixing piece 1 on the metal rod 4 and fixing the metal rod with the base watch; and finally, connecting the outgoing lines of the two coils 2 with a circuit board of the gas meter.

The non-magnetic signal acquisition device of the double-hollow coil gas meter is not limited to the horizontal installation mode shown in figure 1, and can also be vertically installed according to a base meter structure, at the moment, the circular shaft 31 reciprocates left and right in the oval slot hole 41, and the metal rod 4 reciprocates up and down; besides the horizontal and vertical installation modes, the installation can also be reasonably designed according to the specific structure of the gas meter, as long as the reciprocating motion of the circular shaft 31 in the elliptical groove hole 41 along the length direction thereof and the alternating reciprocating motion of the metal rod 4 in the two fixing pieces 1 can be met.

The structure of this embodiment makes the circuit processing simple, need not special MCU and does the processing, directly use the whole master control MCU of table of gas table can, the cost is lower, simple structure, and easily realization.

Examples 2,

The embodiment provides a method for obtaining a message from a nonmagnetic message obtaining device of a double-hollow-coil gas meter as described in embodiment 1, and as shown in fig. 1, the method at least includes the following steps:

s1, when gas flows through the base meter, the output gear of the base meter rotates to drive the disc 3 to do circular motion;

s2, the circular shaft 31 is driven by the disc to do circular motion, and meanwhile, the circular shaft makes reciprocating motion in the elliptical slot 41 along the length direction of the elliptical slot;

s3, the round shaft 31 drives the metal bar 4 to reciprocate in the two fixing pieces 1;

s4, when the left end of the metal rod 4 moves into the fixing piece 1 close to the left end, the metal rod 4 completely penetrates into the coil 2 at the left end, namely the coil 2 at the left end is filled with the metal rod 4, and an excitation signal received by the left end of the metal rod 4 is in a strongest over-damping state and is output without pulse after being processed by a circuit; meanwhile, the right end of the metal rod 4 is completely separated from the inside of the coil 2 at the right end, namely the inside of the coil 2 at the right end is in a state without the metal rod 4, an excitation signal received by the right end of the metal rod 4 is in a strongest underdamping state, and pulse output is realized after the excitation signal is processed by a circuit.

Every time the disk 3 rotates for a circle, the two coils 2 alternately enter an over-damping state and an under-damping state, so that the phenomenon that multiple counts are caused by mechanical vibration can be avoided, and the electromechanical signal conversion of the gas meter is reliably realized.

According to the method for picking up the information of the non-magnetic information picking-up device of the double-hollow-coil gas meter, the two hollow coils alternately enter an over-damping state and an under-damping state, electromechanical conversion is realized through circuit post-processing, comparison of under-damping oscillation intensity and over-damping oscillation intensity is greatly increased, and the problems of magnetic interference of the traditional double-reed pipe and double-Hall element modes and optical interference of photoelectric information picking-up are effectively solved; the method still adopts a mode of alternating two signals, the main logic of the existing Hall signal-taking software algorithm is unchanged, and software transplantation is facilitated.

Examples 3,

This embodiment provides a gas meter, at least includes the base table, still includes as embodiment 1 the no magnetism of double hollow coil gas meter fetches the letter device, or uses the method of fetching the letter of embodiment 2 to carry out gas flow measurement, and the structure of base table is current structure, and no longer repeated here.

The foregoing merely illustrates the principles and preferred embodiments of the invention and many variations and modifications may be made by those skilled in the art in light of the foregoing description, which are within the scope of the invention.