A structure for controlling the valve opening of a water meter using magnetic reluctance

Abstract

This utility model discloses a structure for controlling the opening of a water meter valve using magnetic reluctance. It includes a gear transmission system mounted on the water meter valve. The gear transmission system comprises a transmission disc, several meshing gears mounted within the transmission disc, and a housing mounted outside the transmission disc. A PCB board is installed inside the housing, positioned above the meshing gears. The system also includes a magnetic reluctance device and two magnets. The magnetic reluctance device is inserted into the PCB board, and the two magnets are positioned directly below it and fixed to the same gear. When the valve moves forward, the magnets on the gear alternately attract the magnetic reluctance device. The valve's position is determined by detecting the number of magnetic reluctance device engagements, thus determining the current valve opening. This utility model uses magnetic reluctance to detect the valve control system's operating status, which is more reliable than determining the valve's operating status by detecting the motor's operating current.

Description

Technical Field

[0001] This utility model relates to the field of water meter valve opening control technology, specifically a structure for controlling the opening of a water meter valve through magnetic reluctance. Background Technology

[0002] With the increasing prevalence of smart water meters, operators can now aggregate and quantify water meter data directly at their terminals. This leads to higher demands for water meter control. Existing technologies, primarily based on automatic valve switching, only require valves to be fully open or closed, without addressing the specific opening degree or control measures. This results in an inability to precisely control the valve's opening and closing angles, and relies on detecting motor current to determine valve operation and whether it is stalled. This approach suffers from the following problems:

[0003] 1. It is impossible to confirm whether the valve is actuating, or how much it is actuating.

[0004] 2. Motors are inductive loads, and misjudging them by current is prone to errors.

[0005] 3. When using PWM to control the motor, the current acquisition effect is worse due to the inductive load of the motor.

[0006] Therefore, in order to correct the above-mentioned defects, we propose a structure that controls the opening degree of the water meter valve through magnetic reluctance. Utility Model Content

[0007] The technical problem solved by this utility model is to propose a structure that controls the opening degree of a water meter valve through magnetic reluctance.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a structure for controlling the opening degree of a water meter valve via magnetic reluctance, comprising a gear transmission system installed on the water meter valve. The gear transmission system includes a transmission disc, several meshing gears installed inside the transmission disc, and a housing installed outside the transmission disc. A PCB board is installed inside the housing, and the PCB board is positioned above the several meshing gears. The system also includes a magnetic reluctance and two magnets. The magnetic reluctance is inserted into the PCB board, and the two magnets are positioned directly below the magnetic reluctance and fixed to the same gear. When the valve moves forward, the magnets on the gear alternately attract the magnetic reluctance. The valve's position is determined by detecting the number of magnetic reluctance engagements, thereby determining the current valve opening degree.

[0009] Furthermore, the centers of the two magnets and the gear that carries the two magnets are on the same straight line.

[0010] Furthermore, the direction of the magnetoresistive field is parallel to the direction of the magnetic field.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model adopts a magnetic reluctance and magnetic steel detection valve control system, which can ensure the waterproof performance of magnetic transmission and accurately detect the working status of the valve, achieving precise valve opening control. It is suitable for magnetic transmission valve-controlled water meters. By detecting the magnetic reluctance's engagement state and coordinating with PWM modulation of the motor output, the water meter valve can operate at the required opening degree. The valve control system ensures the waterproof performance of the valve control system through magnetic transmission, and controls the torque of the magnetic transmission by PWM modulation of the motor output, ensuring that the motor will not demagnetize due to excessive torque causing valve blockage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the gear transmission system structure in this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of two magnets on a gear in this utility model;

[0014] Figure 3 This is a flowchart illustrating the valve's operation according to its opening degree in this utility model.

[0015] In the diagram: 1. Transmission disc; 2. Gear; 3. Magnet. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides a technical solution:

[0018] Please see Figure 1-3 This invention relates to a structure that controls the opening of a water meter valve using magnetic reluctance. By detecting the working status of the valve control system through magnetic reluctance, it is more reliable than determining the valve's working status by detecting the motor's operating current. For example, when phenomena such as valve demagnetization or jamming occur, the motor current driven by the magnetic drive cannot distinguish these phenomena, and it is impossible to determine whether the motor is idling. This solution can accurately confirm whether the motor is currently operating and what state it is in, unaffected by valve wear, motor aging, or other issues. Even if the motor's operating speed changes due to these problems, the number of motor rotations for one complete valve operation will not change. By controlling the number of phase changes in the operation, the valve opening can be precisely controlled. The cost is low, requiring only a small increase in magnetic reluctance and magnets, as detailed below:

[0019] The magnetoresistive detection scheme uses one magnetoresistive resistor and two magnets 3. The magnetoresistive resistor is inserted into the PCB board. After the PCB board supplies power to the magnetoresistive resistor, it outputs a magnetically engaged state. The two magnets 3 are mounted on the gears of the valve's transmission system, with the two magnets 3 forming a 180-degree angle. The magnetoresistive resistor is placed directly above the magnets 3, and its direction is parallel to the direction of the magnetic field. See the schematic diagram of the transmission system. Figure 1 See the installation diagram for the magnet. Figure 1-2 The flowchart for valve operation according to opening degree is shown below. Figure 3 .

[0020] When the valve moves forward, the magnets on the gear alternately attract the magnetic reluctance. The valve's position is determined by detecting the number of magnetic reluctance rotations, thus determining the current valve opening. Through structural design, the number of gear rotations for one complete valve movement is known. For example, if the gear rotates 10 times for one complete valve movement, and the movement typically takes 10 seconds, then the magnetic reluctance will experience 40 high and low level changes, with an average interval of 250ms between each change. Assuming a 30% valve opening, the valve is first fully opened. If no level change is detected for one second, the valve is considered fully opened. Then, the valve is closed, and the number of level changes to process during closure is calculated to be 40 * (1 - 0.3) = 28. After 28 level changes, the valve is fully opened.

[0021] This structure is suitable for magnetically driven valve-controlled water meters. By detecting the engagement state of the reluctance magnets and coordinating with PWM modulation of the motor output, the water meter valve can be operated to the required opening degree. The valve control system ensures its waterproof performance through magnetic transmission. PWM modulation controls the torque of the magnetic transmission to the motor output, ensuring that the motor will not demagnetize due to excessive torque causing valve blockage. Simultaneously, the software can detect whether one of the two reluctance magnets is damaged. If one magnet is damaged (i.e., one reluctance shows no phase change), the direction detection function is canceled, and only the valve opening function is implemented.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure for controlling the opening degree of a water meter valve via magnetic reluctance, comprising a gear transmission system mounted on the water meter valve, the gear transmission system comprising a transmission disc (1), a plurality of meshing gears (2) mounted within the transmission disc (1), and a housing mounted outside the transmission disc (1), wherein a PCB board is mounted inside the housing, the PCB board being positioned above the plurality of meshing gears (2), characterized in that: It also includes a magnetic reluctance and two magnets (3). The magnetic reluctance is inserted on the PCB board, and the two magnets (3) are located directly below the magnetic reluctance. The two magnets (3) are fixed on the same gear. When the valve moves in the forward direction, the magnets (3) on the gear (2) take turns attracting the magnetic reluctance. The valve's position is determined by detecting the number of turns of magnetic reluctance attraction, thereby determining the current opening degree of the valve.

2. The structure for controlling the opening degree of a water meter valve via magnetic reluctance according to claim 1, characterized in that: The centers of the two magnets (3) and the gear that carries the two magnets (3) are on the same straight line.

3. The structure for controlling the opening degree of a water meter valve via magnetic reluctance according to claim 1, characterized in that: The direction of the magnetoresistive field is parallel to the direction of the magnetic field.

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