A non-magnetic signal receiving device and signal receiving method for a single hollow coil gas meter and a gas meter

Abstract

The present invention relates to the field of metering technology, and specifically to a non-magnetic signal obtaining device for a single hollow coil gas meter, comprising at least a disc and a metal rod, a gear being provided on the circumference of the disc, a circular shaft being fixed on the disc, an elliptical slot being provided at one end of the metal rod perpendicular to the length direction of the metal rod, the disc being arranged on the base meter of the gas meter and meshing with the output gear of the base meter, the other end of the metal rod being arranged on the base meter via a fixing member, a coil being wound around the fixing member, the lead wire of the coil being connected to the circuit board of the gas meter, the circular shaft being passed through the elliptical slot; when gas flows through the base meter, the output gear of the base meter rotates, driving the disc to rotate, thereby driving the metal rod to alternately reciprocate in the fixing member. The beneficial effects of the present invention are: by reducing one coil, the size is greatly reduced, bringing greater flexibility to the shell design; and the magnetic interference of the traditional double reed switch and double Hall element methods, as well as the optical interference problem of photoelectric signal obtaining, are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the field of metering technology, and in particular to a non-magnetic signal obtaining device and signal obtaining method for a single hollow coil gas meter, and a gas meter. Background Art

[0002] Currently, common measurement and data collection methods for gas meters include dual reed switches, dual Hall elements, and photoelectric sensing. Dual reed switches and dual Hall elements are susceptible to magnetic field interference, leading to miscounts. Similarly, photoelectric sensing can also be affected by light interference, leading to miscounts and requiring high light-shielding properties from the housing.

[0003] For example, Chinese patent CN111579006A, published on August 25, 2020, discloses a non-magnetic sensor metering and detection smart gas meter. The gas meter is equipped with a mechanical accumulator for gas flow measurement. A main drive wheel is provided on a perpendicular surface of the mechanical accumulator's drive shaft. The surface of the main drive wheel is bisected by a line passing through the center of the circle, forming two semicircles. One semicircle is made of metal, and the other is made of non-metal. Each semicircle is provided with a spatially fixed inductor, namely a first inductor and a second inductor. The gas meter also includes a controller circuit comprising a microprocessor and an A / D converter module. A first LC circuit formed by connecting the first inductor in parallel with the first capacitor is connected to the first input port of the A / D converter module, and a second LC circuit formed by connecting the second inductor in parallel with the second capacitor is connected to the second input port of the A / D converter module. The technical solution utilizes a ferrite core to increase inductance and converge magnetic flux lines to achieve external metal detection. However, external magnetic fields can easily saturate the ferrite core, rendering it ineffective.

[0004] The applicant applied for a patent with publication number CN113432664A, which disclosed a non-magnetic signal obtaining device and signal obtaining method for a double hollow coil gas meter. However, this method has the following disadvantages: 1. It is large in size, which reduces the flexibility of the shell design; 2. It has many components, many installation and operation steps, and high cost; 3. It has large friction resistance, which in turn affects the pressure loss of the gas meter. Summary of the Invention

[0005] To overcome the shortcomings of the above technologies, the present invention provides a non-magnetic signaling device for a single air-core coil gas meter. This signaling device has a simple structure, is easy to implement, and has high reliability. It effectively avoids the magnetic interference of traditional dual reed switch and dual Hall element methods, as well as the optical interference of photoelectric signaling. The present invention also provides a signaling method for a dual air-core coil gas meter non-magnetic signaling device and a gas meter.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a non-magnetic signal obtaining device for a single hollow coil gas meter, comprising at least a disc and a metal rod, a gear being provided on the circumference of the disc, a circular shaft being fixed on the disc, an elliptical slot being provided at one end of the metal rod perpendicular to the length direction of the metal rod, the disc being arranged on the base meter of the gas meter and meshing with the output gear of the base meter, the other end of the metal rod being arranged on the base meter through a fixing part, a coil being wound around the fixing part and the lead wire of the coil being connected to the circuit board of the gas meter, the circular shaft being passed through the elliptical slot; when the gas flows through the base meter, the output gear of the base meter rotates to drive the disc to rotate, thereby driving the circular shaft to reciprocate in the elliptical slot along its length direction and then driving the metal rod to alternately reciprocate in the fixing part.

[0007] Preferably, the fixing member and the disc are both made of non-magnetic materials.

[0008] Preferably, the fixing member and the disc are made of plastic.

[0009] Preferably, the outer surface of the fixing member is provided with a groove for winding the coil, and the fixing member is provided with a through hole along the central axis that matches the shape of the metal rod so that the metal rod can alternately reciprocate in the fixing member.

[0010] Preferably, 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 the diameter of the metal rod.

[0011] Preferably, the length of the elliptical slot is greater than or equal to the diameter of the circle where the circular axis lies.

[0012] A method for obtaining a signal from a non-magnetic signal obtaining device of a single hollow coil gas meter as described above, comprising: S1, when gas flows through the base meter, the output gear of the base meter rotates, driving the disc to perform circular motion; S2, the disc drives the circular shaft to perform circular motion, and at the same time performs reciprocating motion in the elliptical slot along the length direction of the elliptical slot; S3, the circular shaft drives the metal rod to perform reciprocating motion in the fixing part; S4, determining the initial position of the metal rod, if the metal rod is initially outside the coil, executing step S5, if the metal rod is initially inside the coil, executing step S6; S5, damping enhancement half-cycle detection: sending a weak excitation signal and detecting the output pulse of the coil, and continuously sending a strong excitation signal after receiving the pulse signal until the pulse signal output by the coil can no longer be received; S6, damping reduction half-cycle detection: sending a strong excitation signal and detecting the output pulse of the coil, and continuously sending a weak excitation signal until the pulse signal output by the coil is received if no pulse signal is received; S7, a damping enhancement half-cycle and a damping reduction half-cycle constitute a complete signal of one rotation of the disc.

[0013] Preferably, in step S4, the method for determining the initial position of the metal rod includes: sending a weak excitation signal to the coil and then detecting the output pulse of the coil; if a pulse is received, it is determined that the metal rod is outside the coil; if no pulse signal is received, a strong excitation signal is sent and the output pulse of the coil is detected; if no pulse signal is received, it is determined that the metal rod is completely inside the coil; if no pulse signal is received, a strong excitation signal is continuously sent until the output pulse of the coil is no longer detected, at which point the metal rod is completely inside the coil.

[0014] The present invention also provides a gas meter, which includes at least a base meter and the aforementioned non-magnetic signal obtaining device for the single hollow coil gas meter, or uses the aforementioned signal obtaining method to measure gas flow.

[0015] The beneficial effects of the present invention are: (1) by reducing one coil, the size is greatly reduced, which brings greater flexibility to the shell design; (2) the friction resistance between a fixing part and the metal rod is reduced, and the pressure loss of the whole machine is reduced; (3) the number of components of the present invention is reduced, the cost is reduced, and the production and assembly efficiency is improved; (4) the circular motion of the base meter output gear is converted into the reciprocating motion of the metal rod, so that the hollow coil alternately enters the over-damped and under-damped states, and the electromechanical conversion is realized through circuit post-processing, which greatly increases the contrast between the under-damped and over-damped oscillation intensities; (5) the magnetic interference of the traditional double reed switch and double Hall element methods, as well as the optical interference problem of photoelectric signal acquisition are effectively avoided.

[0016] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 This is a structural schematic diagram of a non-magnetic signal obtaining device for a single hollow coil gas meter according to an embodiment of the present invention.

[0019] Among them: 1. fixing part, 11. groove, 12. through hole, 2. coil, 3. disk, 31. round shaft, 4. metal rod, 41. elliptical slot. DETAILED DESCRIPTION

[0020] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0021] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0022] Explanation of terms:

[0023] 1. Electromechanical signal conversion: convert the mechanical rotation signal of the base meter into an electrical signal that can be collected and processed.

[0024] 2. Overdamped state: When the metal rod moves into the inside of the hollow coil, it is in the overdamped state.

[0025] 3. Underdamped state: When the metal rod moves out of the hollow coil, it is in the underdamped state.

[0026] A non-magnetic signal receiving device for a single hollow coil gas meter. Figure 1 The gas meter comprises at least a disc 3 and a metal rod 4. A gear is provided on the circumference of the disc 3, and a circular shaft 31 is fixed to the disc 3. One end of the metal rod 4 is provided with an elliptical slot 41 perpendicular to its length. The disc 3 is mounted on the base meter of the gas meter and meshes with the output gear of the base meter. The other end of the metal rod 4 is mounted on the base meter via a fixing member 1. A coil 2 is wound around the fixing member 1, and the lead wire of the coil is connected to the circuit board of the gas meter. The circular shaft 31 is inserted into the elliptical slot 41. When gas flows through the base meter, the output gear of the base meter rotates, driving the disc 3 to rotate, thereby driving the circular shaft 31 to reciprocate along its length in the elliptical slot 41, and then driving the metal rod 4 to alternately reciprocate in the fixing member 1.

[0027] The lead wires of coil 2 are connected to the circuit board of the gas meter. The circuit board of the gas meter is provided with the main control MCU of the entire gas meter. Specifically, the lead wires of coil 2 are connected to the main control MCU of the gas meter after passing through the signal conditioning circuit. The signal conditioning circuit is not the innovation of the present invention. The existing signal conditioning circuit structure can be used and will not be described in detail here.

[0028] The fixing member 1 and the disc 3 are both made of non-magnetic material to avoid interference with the receiving process. Furthermore, the fixing member 1 and the disc 3 are made of plastic, which is cheap, light, and easy to process.

[0029] The outer surface of the fixing member 1 is provided with a groove 11 for winding the coil, and the fixing member is provided with a through hole 12 along the central axis thereof that matches the shape of the metal rod 4 so that the metal rod can alternately reciprocate in the fixing member.

[0030] 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 the diameter of the metal rod 4. The length of the elliptical slot 41 is greater than or equal to the diameter of the circle where the circular axis 31 is located.

[0031] The structure of the non-magnetic signal receiving device for the double hollow coil gas meter described in this embodiment is as follows: Figure 1 As shown, first, the disc 3 is fixed to the base meter of the gas meter, specifically, fixed to the outer shell of the base meter, and the disc 3 is engaged with the output gear of the base meter; then, the fixing piece 1 with the coil 2 wound thereon is fixed to the base meter, specifically, also fixed to the outer shell of the base meter; then, one end of the metal rod 4 is inserted into the fixed fixing piece 1, and the circular axis 31 on the disc 3 is inserted into the elliptical slot 41; finally, the lead wire of the coil 2 is connected to the circuit board of the gas meter.

[0032] The double hollow coil gas meter non-magnetic signal obtaining device of the present invention is not limited to the following Figure 1 The horizontal installation method shown can also be installed vertically according to the base meter structure. At this time, the circular shaft 31 reciprocates left and right in the elliptical slot 41, and the metal rod 4 reciprocates up and down. In addition to the horizontal and vertical installation methods, the installation can also be reasonably designed according to the specific structure of the gas meter, as long as the circular shaft 31 can reciprocate along its length in the elliptical slot 41 and the metal rod 4 can reciprocate alternately in the fixing member 1.

[0033] A method for obtaining a signal from a non-magnetic signal obtaining device for a single hollow coil gas meter as described above comprises the following steps: S1, when gas flows through the base meter, the output gear of the base meter rotates, driving the disc 3 to perform a circular motion; S2, the disc drives the circular shaft 31 to perform a circular motion, while simultaneously performing a reciprocating motion in the elliptical slot 41 along the length direction of the elliptical slot; S3, the circular shaft 31 drives the metal rod 4 to perform a reciprocating motion in the fixing member 1; S4, determining the initial position of the metal rod 4. If the metal rod 4 is initially located outside the coil 2, step S5 is executed; if the metal rod 4 is initially located inside the coil 2, step S6 is executed. If the circuit is within 1 minute, then execute step S6; S5, damping enhancement half-cycle detection: send a weak excitation signal and detect the output pulse of coil 2. After receiving the pulse signal, continuously send a strong excitation signal until the pulse signal output by coil 2 cannot be received; S6, damping reduction half-cycle detection: send a strong excitation signal and detect the output pulse of coil 2. If no pulse signal is received, continuously send a weak excitation signal until the pulse signal output by coil 2 is received; S7, a damping enhancement half-cycle and a damping reduction half-cycle constitute a complete signal of one rotation of disk 3.

[0034] In step S4, the method for determining the initial position of the metal rod 4 includes: sending a weak excitation signal to the coil 2 and then detecting the output pulse of the coil 2. If a pulse is received, it is determined that the metal rod 4 is outside the coil 2. If no pulse signal is received, a strong excitation signal is sent and the output pulse of the coil 2 is detected. If no pulse signal is received, it is determined that the metal rod 4 is completely inside the coil 2. If no pulse signal is received, a strong excitation signal is continuously sent until the output pulse of the coil 2 is no longer detected, at which point the metal rod 4 is completely inside the coil 2.

[0035] In step S4, when the right end of metal rod 4 moves closest to disk 3, it completely exits coil 2, meaning coil 2 is free of metal rod 4. At this point, the excitation signal received by the right end of metal rod 4 is in its strongest underdamped state. Even with a weak excitation signal, a pulse is output after processing by the detection circuit. Similarly, when the right end of metal rod 4 moves furthest from disk 3, it completely enters coil 2, meaning coil 2 is completely filled with metal rod 4. At this point, the excitation signal received by the left end of metal rod 4 is in its strongest overdamped state. Even with a strong excitation signal, no pulse is output after processing by the detection circuit. When in the middle position, the specific position of metal rod 4 cannot be determined; the position of metal rod 4 cannot be determined until it reaches its leftmost or rightmost position. With each rotation of disk 3, coil 2 alternates between an overdamped state and an underdamped state, preventing mechanical jitter from causing overcounting and reliably achieving electromechanical signal conversion in the gas meter.

[0036] This embodiment also provides a gas meter, which includes at least a base meter and the aforementioned non-magnetic signal obtaining device for the single hollow coil gas meter, or uses the aforementioned signal obtaining method to measure gas flow.

[0037] The substantial technical effects of this embodiment are: by reducing one coil, the size is greatly reduced, which brings greater flexibility to the shell design; the friction resistance between a fixing part and the metal rod is reduced, thereby reducing the pressure loss of the entire machine; the number of components of the present invention is reduced, the cost is reduced, and the production and assembly efficiency is improved; the circular motion of the base meter output gear is converted into the reciprocating motion of the metal rod, so that the hollow coil alternately enters the over-damped and under-damped states, and the electromechanical conversion is realized through circuit post-processing, which greatly increases the contrast between the under-damped and over-damped oscillation intensities; the magnetic interference of the traditional double reed switch and dual Hall element methods, as well as the optical interference problem of photoelectric signal acquisition are effectively avoided.

[0038] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A non-magnetic signal obtaining method for a single hollow coil gas meter, the signal obtaining method being based on a non-magnetic signal obtaining device for a single hollow coil gas meter, the non-magnetic signal obtaining device comprising at least a disk (3) and a metal rod (4), a gear being provided on the circumference of the disk (3), a circular shaft (31) being fixed on the disk (3), an elliptical slot (41) being provided at one end of the metal rod (4) being perpendicular to the length direction of the metal rod, the disk (3) being provided on the base meter of the gas meter and meshing with the output gear of the base meter The other end of the metal rod (4) is arranged on the base meter through a fixing member (1), a coil (2) is wound on the fixing member (1), and the lead wire of the coil is connected to the circuit board of the gas meter, and the circular shaft (31) is passed through the elliptical slot (41); when the gas flows through the base meter, the output gear of the base meter rotates to drive the disc (3) to rotate, thereby driving the circular shaft (31) to reciprocate along its length direction in the elliptical slot (41), thereby driving the metal rod (4) to alternately reciprocate in the fixing member (1); It is characterized by: The method comprises: S1. When gas flows through the base meter, the output gear of the base meter rotates, driving the disc (3) to make circular motion; S2, the disc drives the circular shaft (31) to make a circular motion, and at the same time makes a reciprocating motion in the elliptical slot (41) along the length direction of the elliptical slot; S3, the circular shaft (31) drives the metal rod (4) to perform reciprocating motion in the fixing member (1); S4, determining the initial position of the metal rod (4), if the metal rod (4) is initially located outside the coil (2), executing step S5, if the metal rod (4) is initially located inside the coil (2), executing step S6; S5, damping enhanced half-cycle detection: sending a weak excitation signal and detecting the output pulse of coil (2), and continuously sending a strong excitation signal after receiving the pulse signal until the pulse signal output by coil (2) can no longer be received; S6, damping reduction half-cycle detection: send a strong excitation signal and detect the output pulse of coil (2). If no pulse signal is received, continue to send a weak excitation signal until a pulse signal output by coil (2) is received; S7, a damping enhancement half cycle and a damping reduction half cycle constitute a complete signal of one rotation of the disk (3).

2. The non-magnetic signal obtaining method for a single hollow coil gas meter according to claim 1, characterized in that: In step S4, the method for determining the initial position of the metal rod (4) includes: sending a weak excitation signal to the coil (2) and detecting the output pulse of the coil (2); if the pulse is received, determining that the metal rod (4) is outside the coil (2); if no pulse signal is received, sending a strong excitation signal and detecting the output pulse of the coil (2); if no pulse signal is received, determining that the metal rod (4) is completely inside the coil (2); if no pulse signal is received, continuously sending a strong excitation signal until the output pulse of the coil (2) is no longer detected, at which point the metal rod (4) is completely inside the coil (2).

3. The non-magnetic signal obtaining method for a single hollow coil gas meter according to claim 1, characterized in that: The fixing member (1) and the disc (3) are both made of non-magnetic materials.

4. The non-magnetic signal obtaining method for a single hollow coil gas meter according to claim 1 or 3, characterized in that: The fixing member (1) and the disc (3) are made of plastic.

5. The non-magnetic signal obtaining method for a single hollow coil gas meter according to claim 1 or 3, characterized in that: The outer surface of the fixing member (1) is provided with a groove (11) for winding a coil, and the fixing member is provided with a through hole (12) along the central axis thereof that matches the shape of the metal rod (4) so ​​that the metal rod can alternately reciprocate in the fixing member.

6. The non-magnetic signal obtaining method for a single hollow coil gas meter according to claim 5, characterized in that: 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 the diameter of the metal rod (4).

7. The non-magnetic signal obtaining method for a single hollow coil gas meter according to claim 1 or 3, characterized in that: The length of the elliptical slot (41) is greater than or equal to the diameter of the circle where the circular axis (31) is located.

8. A gas meter, comprising at least a base meter, characterized in that: Gas flow measurement is performed using the trust-obtaining method described in any one of claims 1 to 7.

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