Water meter impeller, water meter and water meter impeller dynamic balance adjustment method

Abstract

The application provides a water meter impeller, a water meter and a water meter impeller dynamic balance adjustment method, and relates to the technical field of water meters. The water meter impeller is provided with a plurality of dynamic balance embedding grooves which are arranged at intervals in the circumferential direction on the rim, and at least one of the dynamic balance embedding grooves is filled with photocuring material, and the photocuring material is configured to be consolidated under preset wavelength light. The light-controlled reversible fine adjustment mechanism is introduced into the field of dynamic balance correction of plastic water meter impellers for the first time, completely avoiding the risks of micro-cracks, edge collapse and structural weakening caused by traditional weight removal methods; the dynamic balance embedding groove and the impeller body are synchronously formed in the injection molding process, the photocuring equipment can be integrated with an online dynamic balance tester to build a full-automatic closed-loop control system and support large-scale and high-consistency intelligent manufacturing of plastic impellers.

Description

Technical Field

[0001] This invention relates to the field of water meter technology, and in particular to a water meter impeller, a water meter, and a method for adjusting the dynamic balance of the water meter impeller. Background Technology

[0002] Mechanical water meters are the fundamental devices for water supply metering. Their metering accuracy, long-term stability, and operational reliability directly affect the fair measurement of water resources and the control of pipeline leakage. In the existing mainstream structure, the metering impeller is the core component for converting fluid kinetic energy into mechanical rotational energy, and its dynamic balance performance has a decisive impact on the overall meter performance. In response to the trends of lightweighting, corrosion resistance, low cost, and green manufacturing, polymer plastics (such as polyphenylene oxide (PPO), polypropylene (PP), acrylonitrile-butadiene-styrene copolymer (ABS), and their glass fiber reinforced modified materials) have widely replaced traditional brass or stainless steel, becoming the mainstream matrix material for water meter impellers.

[0003] However, during the injection molding process, plastic impellers are easily affected by multiple sources of process disturbances, such as uneven melt flow front, gate position deviation, pressure gradient mismatch, cooling rate spatial difference, dispersion of fillers (such as chopped glass fiber), and micro-wear of mold cavity, which can easily lead to asymmetrical mass distribution at the microscale. Such mass eccentricity induces significant dynamic imbalance torque at the impeller operating speed (usually 50–300 rpm), which manifests as follows: (1) generating periodic vibration and high-frequency metering noise during rotation, interfering with user perception and aggravating shell resonance; (2) accelerating the non-uniform wear of the upper / lower support bearings and shortening the mechanical life of the water meter; (3) causing impeller start-stop shaking and speed fluctuation under low flow conditions, resulting in increased starting flow and excessive metering error at low flow rates; (4) after long-term operation, due to the accumulation of micro-plastic deformation, the dynamic imbalance state further deteriorates, causing irreversible drift in metering accuracy.

[0004] Currently, the industry's prevailing dynamic balancing correction methods mainly follow the metal impeller process, namely using CNC drilling, laser ablation, or milling to remove material locally to offset mass eccentricity. However, this method faces fundamental adaptation obstacles in the plastic impeller scenario: the plastic matrix (especially general-purpose PPO / PP with inorganic filler content <20 wt%) has low tensile strength (usually ≤60 MPa) and high notch sensitivity, making it easy for machining to induce microcracks, edge burrs, or even stress concentration cracking at the blade root; the removal operation is irreversible, and the amount of correction in a single operation is difficult to control precisely, with an extremely high risk of overcorrection; for small-sized, low-moment-of-inertia civilian-grade impellers, the micro-mass adjustment window is extremely narrow, and traditional methods lack sub-milligram level control capabilities; more importantly, existing processes rely on manual visual interpretation of dynamic balancing test data, manual positioning, and point-by-point processing, which cannot be integrated into high-speed injection molding production lines, severely restricting the upgrade to large-scale intelligent manufacturing.

[0005] Therefore, it is urgent to break through the rigid de-weighting path dependence and construct a water meter impeller and its dynamic balancing adjustment method that is compatible with the intrinsic properties of plastic materials, has reversible fine-tuning capability, supports online closed-loop control, and can be seamlessly integrated with automated assembly lines. Summary of the Invention

[0006] The purpose of this invention is to provide a water meter impeller, a water meter, and a method for adjusting the dynamic balance of the water meter impeller, which is applicable to water meter impellers made of polymer plastic without damaging the structural integrity of the impeller, and can achieve precise micro-adjustment of its dynamic balance.

[0007] In a first aspect, the water meter impeller provided by the present invention includes: a wheel rim and a plurality of blades, wherein the plurality of blades are arranged at intervals along the circumference of the wheel rim and are respectively fixedly connected to the wheel rim; The wheel rim is provided with a plurality of dynamic balance grooves, which are spaced apart along the circumference of the wheel rim; At least one of the dynamic balancing grooves is filled with a photocurable material, which is configured to solidify under light of a preset wavelength.

[0008] In conjunction with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein each of the dynamic balancing grooves extends in a direction parallel to the wheel rim axis and includes an opening and a groove cavity from the outside to the inside. The area of ​​the opening on the cross-section perpendicular to the wheel rim axis is smaller than the area of ​​the groove on the cross-section perpendicular to the wheel rim axis.

[0009] In conjunction with the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the wheel rim comprises: a rim body and a rim cap coaxially connected to the rim body; The dynamic balancing groove includes a groove cavity provided in the ring body.

[0010] In conjunction with the second possible implementation of the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the dynamic balancing groove further includes an opening disposed in the ring cover, the opening and the groove cavity being connected circumferentially to the wheel rim.

[0011] In conjunction with the second possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein a shaft is coaxially disposed on the inner side of the ring cover; Multiple rods are connected between the shaft and the ring cover, and the multiple rods are arranged at intervals around the shaft.

[0012] In conjunction with the fourth possible implementation of the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein a plug is connected to one end of the ring body away from the ring cover, and the plug is connected to a sleeve that extends into the ring body and is coaxial with the ring body; The shaft is inserted into the sleeve.

[0013] In conjunction with the fifth possible implementation of the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the shaft and the sleeve are provided with matching circumferential positioning portions.

[0014] In conjunction with the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein the shaft is coaxially connected to a worm gear.

[0015] Secondly, the water meter provided by the present invention is equipped with the water meter impeller described in the first aspect.

[0016] Thirdly, the dynamic balancing method for a water meter impeller provided by the present invention is applied to the water meter impeller described in the first aspect, and includes the following steps: The design speed under the preset flow condition is used as the dynamic balancing test speed; The water meter impeller is dynamically balanced at the specified dynamic balance test speed, and the unbalance of the water meter impeller and the corresponding phase angle position are obtained. The phase angle position is mapped to the corresponding dynamic balance groove, and the photocurable material of a weight corresponding to the unbalance amount is filled into the dynamic balance groove; The photocurable material is irradiated with light of a preset wavelength to solidify it.

[0017] The embodiments of the present invention bring the following beneficial effects: by setting multiple dynamic balance grooves in the circumference of the wheel rim and filling at least one groove with a photocurable adjustment material, the light-controlled reversible fine-tuning mechanism is introduced into the field of dynamic balance correction of plastic water meter impellers for the first time, fundamentally overcoming the compatibility defects of traditional weight removal methods with polymer substrates. This structure eliminates the need for mechanical cutting, drilling, or ablation, completely avoiding the risks of microcrack initiation, edge chipping, and structural weakening caused by notch sensitivity, low tensile strength, and anisotropic filler distribution in plastic materials. The photocuring process features controllable energy, precise spatial positioning, and sub-milligram-level dynamic control over mass increments through light intensity, duration, and material layer thickness, making it particularly suitable for civilian-grade plastic impellers with small rotational inertia and low mass redundancy. More importantly, the photocurable material exhibits a stable flow / semi-solid pre-set state in the un-irradiated state, supporting a closed-loop adjustment process of measurement, modeling, tank selection, filling, photocuring, retesting, and iterative compensation. It possesses physical reversibility (uncured material can be removed and reset), significantly reducing the risk of over-calibration and improving the success rate of first-time calibration.

[0018] The dynamic balancing groove and photopolymerization structure design is highly compatible with the integration requirements of injection molding process and intelligent manufacturing production line: the dynamic balancing groove can be formed simultaneously during the impeller body injection molding stage (such as by using a slider core pulling or a post mold insert structure), without adding extra assembly steps; the photopolymerization operation can use an LED surface light source array or a galvanometer scanning ultraviolet / visible light module to complete multi-point synchronous or sequential curing within the production line cycle, and is compatible with online dynamic balancing testers (such as high-sensitivity magnetoelectric sensors + FFT real-time spectrum analysis system) to form a fully automatic closed-loop control unit, truly realizing a paradigm upgrade from offline manual repair to online intelligent fine-tuning, providing a core technology support that can be engineered and implemented for the large-scale, high-consistency manufacturing of plastic water meter impellers.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a water meter impeller provided in an embodiment of the present invention; Figure 2 A cross-sectional view of the impeller rim and blades of a water meter provided in an embodiment of the present invention; Figure 3 A schematic diagram of the impeller rim and blades of a water meter provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the ring cover, shaft, rod, and worm gear of a water meter impeller provided in an embodiment of the present invention.

[0022] Icons: 100-Rim; 110-Rim body; 120-Rim cap; 130-Plug; 140-Sleeve body; 200-Blade; 300-Dynamic balance groove; 301-Opening; 302-Cavity; 400-Shaft; 500-Rod; 600-Worm. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities in the International System of Units (SI), or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] like Figure 1 As shown, the water meter impeller provided in this embodiment of the invention includes: a wheel rim 100 and a plurality of blades 200, the plurality of blades 200 being arranged at intervals along the circumference of the wheel rim 100 and respectively fixedly connected to the wheel rim 100; the wheel rim 100 is provided with a plurality of dynamic balancing grooves 300, the plurality of dynamic balancing grooves 300 being arranged at intervals along the circumference of the wheel rim 100; at least one of the dynamic balancing grooves 300 is filled with a photocurable material, the photocurable material being configured to solidify under light of a preset wavelength.

[0027] Multiple blades 200 are evenly spaced along the circumference of the impeller rim 100 and integrally formed onto the outer circumferential sidewall of the impeller rim 100 by injection molding, forming a complete impeller body. The impeller rim 100 is annular, with its axis being the center line of impeller rotation. The blades 200 extend radially outward from the impeller rim 100 to drive the impeller rim 100 to rotate around its axis under the action of water flow. Multiple dynamic balancing grooves 300 are spaced circumferentially on the shaft end wall of the impeller rim 100. Each dynamic balancing groove 300 has a concave structure, and its number can be set according to the impeller diameter, moment of inertia, and manufacturing tolerance control requirements, for example, it can be 10, 30, 50, or hundreds, etc. The circumferential included angle between adjacent grooves is equal. At least one dynamic balancing groove 300 is filled with a photocurable material; the photocurable material is a preset wavelength responsive liquid or semi-solid polymer precursor, such as an ultraviolet photosensitive resin system containing acrylate or epoxy groups, which undergoes free radical or cationic polymerization reaction under irradiation by an LED light source in the 365nm or 405nm band, changing from a fluid or paste state to a solid state, thus completing the physical anchoring of the mass increment.

[0028] This structure achieves slight adjustments to dynamic balance through controllable weight gain without altering the impeller's main geometry and mechanical boundaries, avoiding mechanical damage to the plastic substrate. Furthermore, the photocuring process is free from thermal stress abrupt changes and vibration impacts, and it exhibits good compatibility with the thermal expansion coefficient of polymer materials.

[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, each dynamic balancing groove 300 extends in a direction parallel to the axis of the rim 100, and includes an opening 301 and a cavity 302 from the outside to the inside. The area of ​​the opening 301 on the cross-section perpendicular to the axis of the rim 100 is smaller than the area of ​​the cavity 302 on the cross-section perpendicular to the axis of the rim 100. That is, the overall direction of the groove is perpendicular to the impeller rotation plane, which facilitates the use of slider core pulling or insert structure in the injection mold, and also facilitates the incident light source of the photocuring light along its axis. The groove includes an opening 301 and a cavity 302, which are arranged in the radial direction of the rim 100 from the outside to the inside: the opening 301 is located on the outermost circumferential surface of the rim 100, and the cavity 302 is located inside the opening 301. Its cross-sectional area is larger than the projected area of ​​the opening 301 on the plane perpendicular to the axis of the rim 100, forming a stepped volume structure with a smaller outer diameter and a larger inner diameter. The structure has a dual function: on the one hand, the small opening of the opening 301 can limit the lateral overflow of the photocurable material during the filling process and improve the positioning accuracy; on the other hand, the large volume of the cavity 302 provides a stable space for the photocurable material and enhances the mechanical interlocking strength between the solidified material and the wheel rim body, preventing centrifugal detachment under high-speed rotation.

[0030] Furthermore, the wheel rim 100 includes: a rim body 110 and a rim cover 120 coaxially connected to the rim body 110; the dynamic balancing groove 300 includes a groove cavity 302 disposed in the rim body 110. The wheel rim 100 adopts a split structure, the rim cover 120 is an independent annular cover plate, coaxially disposed with the rim body 110, and can be fixedly connected to one end face of the rim body 110 by ultrasonic welding or hot plate welding. The groove cavity 302 of the dynamic balancing groove 300 is directly formed on the outer peripheral sidewall of the rim body 110, and the groove cavity 302 can be formed during the injection molding of the rim body 110 without post-processing. This structure allows the forming of the dynamic balancing groove 300 to be completely integrated into the injection molding process of the impeller body, without adding additional assembly steps or weakening the structural continuity of the rim body 110, which is beneficial to ensuring the overall rigidity and long-term dimensional stability of the impeller.

[0031] Furthermore, the dynamic balancing groove 300 also includes an opening 301 disposed in the ring cover 120, the opening 301 and the groove cavity 302 being connected circumferentially to the rim 100. Photocurable material can be injected from the outside of the ring cover 120 through the opening 301 into the groove cavity 302, providing an open and highly visible operating path; simultaneously, the ring cover 120 serves as a light incident surface, facilitating subsequent uniform irradiation using a surface light source array, thus improving curing consistency. After the photocurable material is solidified in the groove cavity 302 and the opening 301, a reinforced structure extending from the groove cavity 302 into the opening 301 can be formed, thereby improving the connection stiffness and stability between the rim 110 and the ring cover 120.

[0032] In this embodiment, a shaft 400 is coaxially arranged inside the ring cover 120; multiple rods 500 are connected between the shaft 400 and the ring cover 120, and the multiple rods 500 are spaced apart around the shaft 400.

[0033] A shaft 400 is coaxially positioned at the center of the inner side of the ring cover 120. The shaft 400 is a cylindrical protrusion structure used to mate with the support shaft hole in the water meter movement. The shaft 400 and the ring cover 120 are integrally injection molded. Multiple rods 500 are evenly distributed around the circumference of the shaft 400. One end of each rod 500 is connected to the outer circumferential surface of the shaft 400, and the other end is connected to the inner circumference of the ring cover 120, forming a radial reinforcing rib structure to improve the torsional stiffness and axial load-bearing capacity of the ring cover 120 under high-speed rotation. This structure effectively suppresses the micro-deformation of the ring cover 120 caused by centrifugal force without significantly increasing the mass, ensuring the spatial positional stability of the dynamic balancing groove 300, and thus maintaining the phase accuracy of the photocured material weight.

[0034] Furthermore, a plug 130 is connected to the end of the ring body 110 opposite to the ring cover 120. The plug 130 is connected to a sleeve 140 that extends into the ring body 110 and is coaxial with the ring body 110. A shaft 400 is inserted into the sleeve 140. The sleeve 140 is a tubular structure, with its axis coinciding with the axis of the wheel rim 100 and extending into the internal cavity of the ring body 110. The shaft 400 is inserted into the inner hole of the sleeve 140, forming a double-support structure: the shaft 400 and the sleeve 140 constitute a radial limiting pair, and the ring cover 120 and the plug 130 together constrain axial movement, thereby improving the overall rotational stability of the impeller.

[0035] It should be noted that the ring body 110, plug 130, sleeve 140, and multiple blades 200 can be integrally molded using injection molding. The ring cover 120, shaft 400, and multiple rods 500 can be processed into a single structure. During assembly, the shaft 400 is inserted into the sleeve 140 and fixed using adhesive or ultrasonic welding. The ring cover 120 and ring body 110 can be fixed by ultrasonic welding or hot plate welding. Further reinforcement can be achieved by curing a UV-cured material within several dynamic balancing grooves 300.

[0036] Furthermore, the shaft 400 and the sleeve 140 are provided with matching circumferential positioning parts. Specifically, the outer circumferential surface of the shaft 400 has a circumferentially extending positioning protrusion, and the inner wall of the sleeve 140 has a matching positioning groove; together, they form a non-circular circumferential positioning fit structure. This circumferential positioning part is used to ensure that the shaft 400 and the sleeve 140 maintain a fixed relative angle in the assembled state, avoiding phase shift of the worm gear 600 transmission due to rotational slippage, thereby ensuring the timing accuracy of the metering signal output.

[0037] In this embodiment, a worm gear 600 is coaxially connected to the shaft 400. The worm gear 600 is connected to the end of the shaft 400 away from the plug 130. The ring cover 120, shaft 400, worm gear 600, and multiple rods 500 can be machined into an integral structure. The worm gear 600 rotates synchronously with the impeller, converting the mechanical rotational motion generated by the water flow into the low-speed, high-torque output required by the downstream counting mechanism.

[0038] The water meter provided in this embodiment of the invention is equipped with the water meter impeller described in the above embodiments. This water meter has the technical advantages of the water meter impeller described above, which will not be repeated here.

[0039] The water meter impeller dynamic balancing adjustment method provided in this embodiment of the invention is applied to the water meter impeller described in the above embodiments, and includes the following steps: using the design speed under a preset flow state as the dynamic balancing detection speed; performing dynamic balancing detection on the water meter impeller at the dynamic balancing detection speed, and obtaining the unbalance amount of the water meter impeller and the corresponding phase angle position; mapping the phase angle position to the corresponding dynamic balancing groove 300, and filling the dynamic balancing groove 300 with a photocurable material of a weight corresponding to the unbalance amount; using a preset wavelength light to irradiate the photocurable material to solidify it.

[0040] Specifically, the method for adjusting the dynamic balance of a water meter impeller includes the following steps: S1: Set the dynamic balancing test speed. The impeller design speed corresponding to the typical flow point of the water meter in actual use (such as Q3 flow, i.e., the commonly used flow) is used as the benchmark for the dynamic balancing test speed; this speed can be obtained through theoretical calculation or calibration.

[0041] S2: At the above-mentioned dynamic balancing test speed, the impeller to be tested is installed in the dynamic balancing test equipment (such as a combination system of magnetoelectric sensor + rotating platform), the vibration signal is collected and analyzed by FFT spectrum to obtain the magnitude of the imbalance (unit: g·mm) and its phase angle position in the circumferential direction of the wheel rim (expressed as 0°~360°).

[0042] S3: Map the phase angle position to the nearest neighboring dynamic balancing groove 300 on the circumferential direction of the wheel rim 100. The mapping rule is as follows: divide 360° into N equal parts (N is the number of grooves), and each part corresponds to a groove number; if the phase angle falls into a certain interval, select the groove with the corresponding number in that interval as the filling target. Subsequently, based on the unbalance value, calculate the required mass of photocurable material, and use a micro-dispensing device to quantitatively fill the corresponding weight of liquid photocurable material into the cavity 302 of the selected dynamic balancing groove 300.

[0043] S4: Irradiate the dynamic balance groove 300 filled with photocurable material using a preset wavelength (e.g., 365 nm) LED surface light source, controlling the light intensity and time to ensure full material curing. After curing, repeat step S2 for retesting. If the imbalance still exceeds the tolerance, repeat steps S3 and S4 for iterative compensation until the dynamic balance accuracy requirements are met.

[0044] This method requires no machining throughout the entire process, and all operations can be completed in a clean workstation or on an assembly line. It supports integration with online dynamic balancing testers, automatic dispensing systems, and PLC control systems to form a fully automatic closed-loop adjustment unit.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water meter impeller, characterized in that, include: A wheel rim (100) and a plurality of blades (200), wherein the plurality of blades (200) are spaced apart along the circumference of the wheel rim (100) and are respectively fixedly connected to the wheel rim (100). The wheel rim (100) is provided with a plurality of dynamic balance grooves (300), and the plurality of dynamic balance grooves (300) are arranged at intervals along the circumference of the wheel rim (100); At least one of the dynamic balancing grooves (300) is filled with a photocurable material, which is configured to solidify under light of a preset wavelength.

2. The water meter impeller according to claim 1, characterized in that, Each of the dynamic balance grooves (300) extends in a direction parallel to the axis of the wheel rim (100) and includes an opening (301) and a groove (302) from the outside to the inside. The area of ​​the opening (301) on the cross-section perpendicular to the axis of the rim (100) is smaller than the area of ​​the groove (302) on the cross-section perpendicular to the axis of the rim (100).

3. The water meter impeller according to claim 1, characterized in that, The wheel rim (100) includes: a rim body (110) and a rim cap (120) coaxially connected to the rim body (110). The dynamic balancing groove (300) includes a groove cavity (302) disposed in the ring body (110).

4. The water meter impeller according to claim 3, characterized in that, The dynamic balancing groove (300) also includes an opening (301) provided in the ring cover (120), and the opening (301) and the groove cavity (302) are connected in the circumferential direction of the wheel rim (100).

5. The water meter impeller according to claim 3, characterized in that, A shaft (400) is coaxially provided on the inner side of the ring cover (120). Multiple rods (500) are connected between the shaft (400) and the ring cover (120), and the multiple rods (500) are spaced apart around the shaft (400).

6. The water meter impeller according to claim 5, characterized in that, The end of the ring body (110) facing away from the ring cover (120) is connected to a plug (130), and the plug (130) is connected to a sleeve (140) that extends into the ring body (110) and is coaxial with the ring body (110). The shaft (400) is inserted into the sleeve (140).

7. The water meter impeller according to claim 6, characterized in that, The shaft (400) and the sleeve (140) are provided with matching circumferential positioning parts.

8. The water meter impeller according to claim 5, 6 or 7, characterized in that, The shaft (400) is coaxially connected to the worm gear (600).

9. A water meter, characterized in that, The water meter is equipped with a water meter impeller as described in any one of claims 1 to 8.

10. A method for dynamic balancing of a water meter impeller, characterized in that, The dynamic balancing method for the water meter impeller is applied to the water meter impeller according to any one of claims 1 to 8, and includes the following steps: The design speed under the preset flow condition is used as the dynamic balancing test speed; The water meter impeller is dynamically balanced at the specified dynamic balance test speed, and the unbalance of the water meter impeller and the corresponding phase angle position are obtained. The phase angle position is mapped to the corresponding dynamic balance groove (300), and the photocurable material of a weight corresponding to the unbalance amount is filled into the dynamic balance groove (300); The photocurable material is irradiated with light of a preset wavelength to solidify it.

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