Tamperproof assembly for a water meter counter

Abstract

The application discloses an anti-interference assembly for a water meter counter, relates to the technical field of water meter counter anti-interference, and improves the magnetic field interference problem of the water meter counter. The water meter counter comprises a sealing cover, a mounting plate, two groups of magnetic steel groups, a gear spindle and a gear group. One group of the magnetic steel groups is fixed to one end of the gear spindle located in a recess, and the other group of the magnetic steel groups is installed on a gear of the gear group away from the gear spindle. The anti-interference assembly comprises a magnetic shielding sheet, the magnetic shielding sheet is installed on the side of the mounting plate away from the gear group, and is located between the two groups of magnetic steel groups. A through hole is formed in the middle of the magnetic shielding sheet for the recess to pass through. The application can solve the problem of mutual interference of magnetic fields, and improve the measurement accuracy and stability of the water meter under low flow rate working conditions.

Description

Technical Field

[0001] This application relates to the field of anti-interference technology for water meter counters, and in particular to an anti-interference component for water meter counters. Background Technology

[0002] Mechanical water meters count the cumulative water usage by rotating a counter. Our counter has two sets of magnets, whose functions are as follows: Function of the magnet assembly: Through the coupling of the magnets, the mechanical meter realizes the conversion from the rotation of the water meter movement to the counting of the counter; Another function of the magnet assembly: The 100L position remote transmission magnet customized by the customer is used to sense magnetic signals through the Hall element during the rotation of the counter, thereby realizing electromechanical conversion and supporting wireless remote transmission function.

[0003] During rotation, there is mutual magnetic field interference between the two sets of magnets. Especially under low-speed operating conditions, the resistance encountered by the gear rotation will significantly affect the metering accuracy of the water meter in the low flow rate region. At the same time, the magnetic field changes of the magnets at different positions further exacerbate the instability in the metering process, leading to a decline in the metering performance of the water meter. Utility Model Content

[0004] To improve the accuracy and stability of water meter readings at low flow rates, this application provides an anti-interference component for a water meter counter.

[0005] This application provides an anti-interference component for a water meter counter, employing the following technical solution: An anti-interference component for a water meter counter includes a sealing cover, a mounting plate, two sets of magnets, a gear spindle, and a gear set. The mounting plate is installed inside the sealing cover, and a recessed portion in the center of the mounting plate is provided for mounting the gear spindle. The gear set is mounted on the mounting plate, and the gear spindle drives the gear set to operate. One set of magnets is fixed to one end of the gear spindle located in the recessed portion, and the other set of magnets is installed on a gear in the gear set away from the gear spindle. The anti-interference component includes an anti-magnetic sheet, which is installed on the side of the mounting plate away from the gear set and located between the two sets of magnets. A through hole is provided in the center of the anti-magnetic sheet for the recessed portion to pass through.

[0006] By adopting the above technical solution and placing an anti-magnetic sheet between the two sets of magnets, the magnetic field interference generated by the two sets of magnets during rotation can be reduced. This helps to reduce the resistance during transmission and the instability caused by changes in resistance, thereby improving the accuracy and stability of the water meter at low flow rates.

[0007] Optionally, the antimagnetic sheet is a silicon steel sheet.

[0008] By adopting the above technical solution, silicon steel sheets have the characteristic of high magnetic permeability, which can provide a low magnetic resistance path for interfering magnetic fields, greatly enhancing the absorption and shielding efficiency of dynamically changing magnetic fields between two sets of magnets; moreover, silicon steel sheets are a mature and cost-effective magnetic material in industry, and choosing them ensures the reliability of the solution and the feasibility of large-scale production.

[0009] Optionally, the mounting plate has an annular groove on the side opposite to the gear set for installing the antimagnetic sheet. The outer side of the antimagnetic sheet has a snap-fit ​​opening, and the inner wall of the annular groove has a retaining strip. After the antimagnetic sheet is inserted into the annular groove through the cooperation of the snap-fit ​​opening and the retaining strip, the retaining strip is rotated to limit the antimagnetic sheet in the annular groove.

[0010] By adopting the above technical solution, the annular groove structure ensures that the anti-magnetic sheet can be accurately positioned in the designed center position, which is a prerequisite for ensuring optimal and consistent magnetic shielding effect. The "click-in-rotate-lock" installation method eliminates the need for additional screws or adhesives, simplifying the assembly process and improving production efficiency.

[0011] Optionally, the bottom of the annular groove has several support bars distributed around the axis, and the antimagnetic sheet is located between the support bars and the locking bar.

[0012] By adopting the above technical solution, several support bars are distributed around the axis at the bottom of the annular groove, confining the antimagnetic sheet between the support bars and the retaining bars. This design further enhances the stability of the antimagnetic sheet installation. The support bars provide additional support for the antimagnetic sheet, preventing it from deforming or shifting after being subjected to external forces or prolonged use. This ensures that the antimagnetic sheet can continuously and reliably isolate the magnetic field interference between the two sets of magnets, maintaining the accuracy and stability of the water meter at low flow rates.

[0013] Optionally, the diameter of the through hole is larger than the outer diameter of the recess.

[0014] By adopting the above technical solution, the diameter of the through hole is larger than the outer diameter of the recess. This design provides sufficient space and tolerance for installation, allowing the gear spindle to pass smoothly through the through hole in the center of the antimagnetic sheet and be installed in the recess of the mounting plate, reducing installation difficulty and improving assembly efficiency. At the same time, it also avoids interference between the antimagnetic sheet and the gear spindle due to installation errors, ensuring that all components of the water meter counter can be installed and operate normally, thereby guaranteeing that the antimagnetic sheet effectively isolates magnetic field interference and improves the water meter's low-flow-rate metering performance.

[0015] In summary, this application has the following beneficial effects: By installing an anti-magnetic sheet between the two sets of magnets in the water meter counter and optimizing its installation structure and material selection, magnetic field interference between the two sets of magnets is effectively blocked, resistance fluctuations during gear transmission are reduced, and the metering accuracy and stability of the water meter under low flow rate conditions are significantly improved. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of an embodiment of this application; Figure 2 This is an exploded view of an embodiment of this application; Figure 3 This is a schematic diagram illustrating the connection between the mounting plate and the anti-magnetic sheet in an embodiment of this application.

[0017] Explanation of reference numerals in the attached drawings: 1. Sealing cover; 2. Mounting plate; 3. Magnet assembly; 4. Gear spindle; 5. Gear assembly; 6. Recess; 7. Synchronous transmission wheel; 8. Antimagnetic sheet; 9. Through hole; 10. Annular groove; 11. Bayonet; 12. Locking strip; 13. Support strip. Detailed Implementation

[0018] The present application will be further described in detail below with reference to the accompanying drawings.

[0019] This application discloses an anti-interference component for a water meter counter, which aims to solve the problem of mutual interference of magnetic fields generated by the two sets of magnet groups 3 in the water meter counter during operation. In particular, it addresses the issue of measurement accuracy being affected at low flow rates by improving measurement performance through structural optimization.

[0020] Reference Figure 1 , 2 The water meter counter includes a sealing cover 1, a mounting plate 2, two sets of magnets 3, a gear spindle 4, and a gear set 5. The mounting plate 2 is installed inside the sealing cover 1 and has a disc-shaped structure that fits the inner cavity of the sealing cover 1. A recessed portion 6 is integrally formed in the center of the mounting plate 2, recessed along the axial direction of the mounting plate 2 to form a space for mounting the gear spindle 4. A synchronous transmission wheel 7 is coaxially fixedly connected to the bottom of the gear spindle 4. When passing through the synchronous transmission wheel 7, the gear spindle 4 and the synchronous transmission wheel 7 are rotatably connected within the recessed portion 6, allowing for stable rotation around their own axis.

[0021] Reference Figure 1 , 2 The gear set 5 consists of multiple meshing gears and is assembled on the side of the mounting plate 2 facing the inside of the sealing cover 1. The gear spindle 4 meshes with the gear in the gear set 5 near the recess 6 to form a transmission connection. When the gear spindle 4 rotates, it can drive the entire gear set 5 to operate in sequence, thereby realizing the accumulation of water volume measurement.

[0022] Reference Figure 1 ,2 The two sets of magnets 3 perform different functions in the counter: one set of magnets 3 is fixed on the synchronous transmission wheel 7 of the gear main shaft 4, and its main function is to transmit the rotation of the water meter movement to the counter through magnetic field coupling. It is a key component for converting mechanical rotation into a counting system. The other set of magnets 3 is installed on a gear in the gear set 5 that is away from the gear main shaft 4. This set of magnets 3, in cooperation with an external Hall element, realizes the induction and conversion of magnetic signals, providing the basic signal for the wireless remote transmission function.

[0023] Reference Figure 1 , 2 To reduce magnetic field interference between the two sets of magnets 3 during rotation, the anti-interference component of this application includes an antimagnetic plate 8. This antimagnetic plate 8 is installed on the side of the mounting plate 2 away from the gear set 5, and its installation position is precisely between the magnetic field paths of the two sets of magnets 3, effectively blocking or weakening the magnetic field interaction between the two sets of magnets. A through hole 9 is provided in the center of the antimagnetic plate 8. When the antimagnetic plate 8 is installed, the recessed portion 6 can pass through the through hole 9, which avoids interference between the antimagnetic plate 8 and the mounting structure of the gear spindle 4, and ensures that the antimagnetic plate 8 is in the optimal shielding position.

[0024] Reference Figure 1 , 2 In terms of material selection, silicon steel sheet is preferably used for the antimagnetic sheet 8. Silicon steel sheet is a ferromagnetic alloy with a high silicon content, which has excellent magnetic permeability and low hysteresis loss characteristics. When the interfering magnetic field generated by the two sets of magnets 3 acts on the silicon steel sheet, the silicon steel sheet can provide a low magnetic resistance path for the magnetic field, so that most of the interfering magnetic field is concentrated inside the silicon steel sheet to form a closed loop, thereby reducing the leakage of magnetic field to the other set of magnets and significantly reducing the mutual interference between the two sets of magnets.

[0025] Reference Figure 2 , 3 To ensure the secure installation of the antimagnetic sheet 8, an annular groove 10 is provided on the side of the mounting plate 2 opposite to the gear set 5. This annular groove 10 is arranged in a ring around the axis of the mounting plate 2. Multiple slots 11 are spaced circumferentially along the outer edge of the antimagnetic sheet 8. A retaining strip 12 is fixedly installed on the inner wall of the annular groove 10 of the mounting plate 2, with the size of the slots 11 matching the retaining strip 12. During assembly, first align the slots 11 of the antimagnetic sheet 8 with the retaining strip 12 in the annular groove 10, allowing the antimagnetic sheet 8 to smoothly engage with the annular groove 10. Then, rotate the antimagnetic sheet 8 by a certain angle, causing the retaining strip 12 to misalign with the slots 11. At this point, the side of the retaining strip 12 forms a limiting fit with the edge of the antimagnetic sheet 8, firmly locking the antimagnetic sheet 8 within the annular groove 10 and preventing it from shifting due to vibration or magnetic force during water meter operation.

[0026] Reference Figure 2 , 3Furthermore, several support strips 13 are evenly distributed circumferentially at the bottom of the annular groove 10. These support strips 13 are integrally formed with the mounting plate 2 and extend radially outward along the annular groove 10. When the antimagnetic sheet 8 is installed in the annular groove 10, its bottom surface contacts the support strips 13, while its top surface is pressed by the retaining strips 12, thereby stably confining the antimagnetic sheet 8 between the support strips 13 and the retaining strips 12. The support strips 13 not only enhance the stability of the antimagnetic sheet 8 installation but also create a small gap between the antimagnetic sheet 8 and the bottom of the annular groove 10, which helps reduce the transmission of vibration from the mounting plate 2 to the antimagnetic sheet 8. At the same time, it provides buffer space for possible minor deformations, ensuring that the antimagnetic sheet 8 always remains flat and guaranteeing the stability of the shielding effect.

[0027] Regarding the size design of the through hole 9, its diameter is slightly larger than the outer diameter of the recess 6. This design provides ample tolerance for the installation of the antimagnetic plate 8, ensuring that even with minor positioning deviations during assembly, the recess 6 can smoothly pass through the through hole 9, avoiding installation interference. Furthermore, the appropriate gap reduces contact between the antimagnetic plate 8 and the recess 6, lowering the vibration transmitted to the antimagnetic plate 8 through the recess 6 when the gear spindle 4 rotates, preventing abnormal noise or wear due to vibration, and extending its service life. Additionally, the gap between the antimagnetic plate 8 and the recess 6 also prevents the antimagnetic plate 8 from interfering with the magnet assembly 3 within the recess 6.

[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An anti-interference component for a water meter counter, the water meter counter comprising a sealing cover (1), a mounting plate (2), two sets of magnets (3), a gear spindle (4), and a gear set (5), wherein the mounting plate (2) is installed inside the sealing cover (1), the mounting plate (2) has a recess (6) in the middle for mounting the gear spindle (4), the gear set (5) is mounted on the mounting plate (2), and the gear spindle (4) drives the gear set (5) to operate, characterized in that: One set of the magnets (3) is fixed to one end of the gear spindle (4) located in the recess (6), and another set of the magnets (3) is installed on the gear in the gear set (5) away from the gear spindle (4); the anti-interference component includes an anti-magnetic sheet (8), which is installed on the side of the mounting plate (2) away from the gear set (5) and located between the two sets of magnets (3), and the anti-magnetic sheet (8) has a through hole (9) in the middle for the recess (6) to pass through.

2. The anti-interference component for a water meter counter according to claim 1, characterized in that: The antimagnetic sheet (8) is a silicon steel sheet.

3. The anti-interference component for a water meter counter according to claim 1, characterized in that: The mounting plate (2) has an annular groove (10) on the side away from the gear set (5) for installing the antimagnetic sheet (8). The outer side of the antimagnetic sheet (8) has a slot (11). The inner wall of the annular groove (10) has a retaining strip (12). After the antimagnetic sheet (8) is inserted into the annular groove (10) through the cooperation of the slot (11) and the retaining strip (12), the retaining strip (12) will limit the antimagnetic sheet (8) in the annular groove (10) by rotation.

4. The anti-interference component for a water meter counter according to claim 3, characterized in that: The bottom of the annular groove (10) is provided with several support bars (13) around the axis, and the antimagnetic sheet (8) is located between the support bars (13) and the locking bar (12).

5. The anti-interference component for a water meter counter according to claim 1, characterized in that: The diameter of the through hole (9) is larger than the outer diameter of the recess (6).

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