A movement and a water meter having such a movement

Abstract

A mechanism and a water meter having the mechanism are disclosed, relating to the technical field of water meters. The mechanism includes a rectifier and an impeller assembly arranged sequentially along an axial direction. The impeller assembly is rotatably connected to the rectifier. A mounting cover is fitted around the rectifier and the impeller assembly, and the rectifier is fixedly connected within the mounting cover. The impeller assembly includes an impeller, which includes a shaft, multiple helical blades, and an annular outer peripheral connecting portion. The multiple blades are circumferentially spaced around the shaft. The outer peripheral connecting portion connects the outer peripheries of the multiple blades together. The outer peripheral connecting portion has multiple notches arranged circumferentially between adjacent blades. One side of each notch is flush with the surface of the blade facing the water outlet, and the other side connects to the end of each adjacent blade away from the shaft. This application has the effects of improving metering accuracy and range ratio, and improving assembly accuracy and efficiency.

Description

Technical Field

[0001] This application relates to the technical field of water meters, and in particular to a movement and a water meter having the movement. Background Technology

[0002] Horizontal rotor water meters are widely used in large-diameter water supply pipelines and industrial water metering due to their advantages such as low pressure loss, large flow capacity, and stable and reliable structure. The mechanism of existing horizontal rotor water meters typically includes components such as a rectifier, impeller, and meter head. The impeller usually consists of a shaft and multiple circumferentially spaced helical blades, with the blade roots fixed to the shaft and the blades operating independently. During operation, water flow impacts the blades axially, driving the impeller to rotate, and a transmission mechanism drives a counter to display the flow rate. In national standards, the metering performance of water meters is evaluated through three key flow points: Q1 is the minimum flow rate, determining the lower limit of the meter's range; Q2 is the boundary flow rate, the turning point between the low zone (Q1~Q2) and the high zone (Q2~Q3) error requirements; and Q3 is the commonly used flow rate, reflecting the metering capability under high flow conditions.

[0003] The existing traditional blade structure has certain shortcomings in metering performance. At point Q1, the water flow energy is weak, and the blade inlet end, directly facing the water flow, is prone to slippage, leading to difficulty in impeller start-up and slow metering, resulting in excessive negative error at point Q1 and limited range ratio. Near point Q2, due to the abrupt change in water flow state between the blade inlet and outlet ends, the error curve is prone to sharp drops or rises, making it difficult to smoothly connect the low and high zones. At point Q3, poor drainage at the blade outlet end increases rotational resistance, causing a negative error at point Q3. Simultaneously, with only the root of the blade fixed, the overhanging portion is prone to deformation and vibration under the impact of the water flow, causing speed fluctuations and further affecting the metering stability at the three flow points. Summary of the Invention

[0004] To address the issues of large measurement errors and short measuring range in existing water meter mechanisms, this application provides a mechanism and a water meter incorporating the mechanism.

[0005] The technical solution provided in this application is as follows: A movement and a water meter having the movement are described in this application. A mechanism includes a rectifier and an impeller assembly, wherein the rectifier and the impeller assembly are arranged sequentially along the axial direction, the rectifier is located on the water inlet side of the impeller assembly, and the impeller assembly is rotatably connected to the rectifier via a rotating shaft. A mounting cover is fitted around the rectifier and the impeller assembly, and the rectifier is fixedly connected inside the mounting cover. The impeller assembly includes an impeller, which includes a shaft, a plurality of helical blades, and an annular outer peripheral connecting portion. The plurality of blades are circumferentially spaced around the shaft, and the outer peripheral connecting portion connects the outer peripheries of the plurality of blades together. The outer peripheral connecting portion has a plurality of notches arranged in a circumferential array between two adjacent blades. One side of the notch is flush with the surface of the blade facing the water outlet side, and the other side of the notch connects to the end of the adjacent two blades away from the shaft.

[0006] By adopting the above technical solution, the overall rigidity of the blade is enhanced by the outer peripheral connection, reducing the speed fluctuation that may be caused by vibration. At the same time, the notch provides an additional discharge channel for the water flow. At low flow rates, the notch reduces the starting resistance of the blade and improves the sensitivity of Q1. At high flow rates, the notch accelerates the discharge of water at the outlet and improves the negative error of Q3. It also smoothly transitions between high and low zones at the dividing flow rate Q2. Thus, while ensuring the impeller strength, it takes into account the hydraulic performance of the entire range, improves the metering performance of Q1, Q2, and Q3, and effectively expands the range ratio.

[0007] Preferably, the end face of the blade at the water inlet end is provided with a first inclined surface that is inclined toward the water inlet side, and the end face of the blade at the water outlet end is provided with a second inclined surface that is inclined away from the water inlet side.

[0008] Preferably, the rectifier, impeller assembly, and mounting cover are assembled as a single unit and horizontally inserted into the water meter's casing from one side along the axial direction. Traditionally, when the rectifier and impeller are installed into the water meter's metal casing, the casing is formed using a casting process, resulting in fixed tolerances in the subsequent machining. This makes it difficult to achieve ideal overlap between the mounting holes of the rectifier and impeller after they are installed separately, leading to concentricity errors between the impeller and rectifier. Furthermore, the errors accumulate during the sequential assembly of multiple components, further amplifying the concentricity error between the rectifier and impeller. These concentricity errors cause uneven force on the impeller during rotation, resulting in speed fluctuations, affecting metering accuracy and precision, and increasing the frictional resistance of the impeller rotation. By assembling the rectifier, impeller assembly, and mounting cover as a single unit and horizontally inserting them into the water meter's casing from one side along the axial direction, the concentricity of the rectifier, impeller assembly, and mounting cover can be guaranteed, thereby improving the metering accuracy of the water meter to a certain extent.

[0009] Preferably, the rectifier is fixedly connected to the water inlet end of the mounting cover, and the end of the rectifier facing away from the impeller assembly is flush with the water inlet end.

[0010] Preferably, it also includes a meter head assembly, wherein the peripheral sidewall of the water meter housing has an assembly port for installing the meter head assembly, and the end of the meter head assembly extends into the water meter housing through the assembly port and is connected to the impeller assembly for transmission.

[0011] Preferably, the mounting cover has an axially formed protrusion at one end facing the meter assembly, and the interior of the protrusion forms a receiving space for accommodating the transmission structure at the end of the impeller assembly. A positioning hole is provided above the protrusion, and the transmission mechanism at the end of the meter assembly extends into the receiving space in the protrusion through the positioning hole to drive the transmission structure at the end of the impeller assembly.

[0012] Preferably, it also includes an adjustment plate fixed to the rectifier, the adjustment plate being disposed within the water flow channel for adjusting the angle at which the water flow impacts the blades.

[0013] Preferably, a circular adjusting plate is fixedly connected to one end of the adjusting plate. An elongated mounting hole is provided on the outer wall of the rectifier. The length direction of the mounting hole is perpendicular to the length direction of the adjusting plate. The adjusting plate extends into the water flow channel through the mounting hole, so that the adjusting plate abuts against the outer wall of the rectifier. The length direction of the adjusting plate is parallel to the water flow direction. Two arc-shaped grooves are symmetrically provided on the adjusting plate. A fastener is inserted in each arc-shaped groove. The fastener passes through the arc-shaped groove and is fixed to the rectifier, so that the adjusting plate is relatively fixed to the rectifier.

[0014] A water meter includes the mechanism described above, and also includes a housing with openings at both ends, wherein the water inlet end of the mounting cover is flush with the water inlet end of the housing.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The design significantly improves metering accuracy and range ratio. Through the outer peripheral connection and its notch, a design that achieves partial connection and partial openness balances blade strength and full-range hydraulic performance, thereby increasing the range ratio. Furthermore, the first inclined plane makes metering at point Q1 more sensitive, and the second inclined plane makes the rotational speed at point Q3 more stable. The first and second inclined planes respectively improve the water flow conditions at the root and tip near point Q2, allowing for a smoother transition of error at point Q2.

[0016] This ensures the concentricity of the rectifier and impeller, improves assembly accuracy, and further guarantees metering accuracy. By integrating the rectifier, impeller assembly, and mounting cover into a single module, the concentricity of the rectifier and impeller is guaranteed by the molding accuracy of the plastic mold, reducing concentricity deviations caused by the accumulation of housing tolerances and assembly errors.

[0017] This design improves assembly efficiency, simplifies the production process, and reduces maintenance costs. By dividing the mechanism into two modules—the rectifier, impeller assembly, and mounting cover are installed from one side of the housing, while the meter assembly is installed from the top—the two modules can be manufactured and maintained independently. Furthermore, since only the meter assembly needs to pass through the top of the housing, the opening can be designed to be small, minimizing disruption to the water flow path and promoting smooth impeller rotation. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the water meter in the embodiments of this application.

[0019] Figure 2 This is a three-dimensional structural diagram of the movement in the embodiments of this application.

[0020] Figure 3 This is an exploded schematic diagram of the movement in an embodiment of this application.

[0021] Figure 4 This is another exploded view of the movement in the embodiments of this application.

[0022] Figure 5 This is an exploded view of the rectifier and impeller assembly in an embodiment of this application.

[0023] Figure 6 This is a cross-sectional view of the impeller in an embodiment of this application.

[0024] Figure 7 This is an exploded view of the regulating plate and rectifier in the embodiments of this application.

[0025] Figure 8 This is an exploded schematic diagram of the water meter in the embodiments of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Metering module; 2. Meter head assembly; 11. Rectifier; 12. Impeller assembly; 13. Mounting cover; 131. Inlet; 132. Outlet; 133. Protrusion; 134. Positioning hole; 14. Rotating shaft; 121. Impeller; 122. First drive shaft; 21. Second drive shaft; 123. Wheel axle; 124. Blade; 125. Outer peripheral connection; 126. First inclined surface; 127. Second inclined surface; 128. Notch; 15. Adjusting plate; 151. Adjusting piece; 16. Mounting hole; 152. Arc groove; 3. Housing; 31. Assembly port. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0028] This application discloses a movement. (Refer to...) Figure 1-3The metering mechanism includes a metering module 1 and a meter head assembly 2. The metering module 1 includes a rectifier 11, an impeller assembly 12, and a mounting cover 13. The rectifier 11 and impeller assembly 12 are arranged sequentially along the axial direction and are rotatably connected, with the rectifier 11 located on the water inlet side of the impeller assembly 12. The rectifier 11 rectifies the water flow entering the water meter, ensuring a smooth impact on the impeller assembly 12. The impeller assembly 12 rotates under the impact of the water flow, converting the kinetic energy of the water into mechanical rotation. The mounting cover 13 is a sleeve structure, fitted around the rectifier 11 and impeller assembly 12, and fixedly connected to the rectifier 11. The mounting cover 13 integrates the rectifier 11 and impeller assembly 12 into the metering module 1, while also providing protection and support for the rectifier 11 and impeller assembly 12. The metering module 1, as a whole, is horizontally inserted axially from one side of the water meter housing 3. Meter head assembly 2 is installed from the outer periphery of water meter housing 3 and is connected to impeller assembly 12 via a transmission. Meter head assembly 2 is used to transmit the rotation of impeller assembly 12 and display it as flow data.

[0029] Reference Figure 2 and Figure 3 The mounting cover 13 has a continuous circumferential sidewall. It is axially fitted around the rectifier 11 and impeller assembly 12. This continuous sidewall provides a smooth and continuous flow channel for the water, reducing eddy current disturbances caused by changes in the inner diameter of the sidewall. An inlet 131 and an outlet 132 are formed at the two ends of the mounting cover 13, respectively. The rectifier 11 is fixedly connected to the inlet 131 end of the mounting cover 13, and the end of the rectifier 11 facing away from the impeller assembly 12 is flush with the inlet 131 end of the mounting cover 13, thereby reducing the generation of eddies or turbulence and ensuring that the water flows smoothly into the impeller assembly 12. Furthermore, the mounting cover 13 serves as the outer shell of the metering module 1, integrating the rectifier 11 and impeller assembly 12 into one unit, ensuring the relative positional accuracy of the rectifier 11 and impeller assembly 12. The rectifier 11 is fixed to the end of the inlet 131 and is flush with the end of the inlet 131, so that the inlet end face of the entire metering module 1 is flat, which makes it easy to fit with the end face of the water meter housing 3.

[0030] Reference Figure 3 and Figure 4 In this application, the rectifier 11, impeller assembly 12, and mounting cover 13 are all manufactured using injection molding. The positional accuracy between the components is directly guaranteed by the precision of the injection mold, which can reduce the cumulative errors generated during the machining and assembly of traditional housings. Simultaneously, the mounting cover 13 is axially fitted around the rectifier 11 and impeller assembly 12, and the three are assembled into a single unit and horizontally inserted axially from one side of the water meter's housing 3. This method ensures the concentricity of the rectifier 11, impeller assembly 12, and mounting cover 13, thereby improving the metering accuracy of the water meter to a certain extent.

[0031] The mounting cover 13 extends axially towards the end facing the meter assembly 2, forming a protrusion 133. The protrusion 133 is located at the central axis of the outlet 132 end of the mounting cover 13. The interior of the protrusion 133 forms a receiving space for accommodating the transmission structure at the end of the impeller assembly 12. A positioning hole 134 is provided above the protrusion 133. The transmission mechanism at the end of the meter assembly 2 extends into the receiving space through the positioning hole 134, achieving a transmission connection with the transmission structure at the end of the impeller assembly 12. The positioning hole 134 guides and limits the transmission mechanism at the end of the meter assembly 2, ensuring precise alignment of the transmission connection between the meter assembly 2 and the impeller assembly 12.

[0032] Reference Figure 4 and Figure 5 The rectifier 11 and impeller assembly 12 are rotatably connected by a rotating shaft 14. One end of the rotating shaft 14 is fixed relative to the central axis of the rectifier 11, and the other end of the rotating shaft 14 is rotatably engaged with the impeller assembly 12. The impeller assembly 12 includes an impeller 121 and a first drive shaft 122. The first drive shaft 122 is coaxially fixed to the side of the impeller 121 away from the rectifier 11. One end of the rotating shaft 14 is coaxially fixedly connected to the rectifier 11, and the other end of the rotating shaft 14 is coaxially rotatably connected to the impeller 121. The end of the meter assembly 2 is provided with a second drive shaft 21, and the first drive shaft 122 and the second drive shaft 21 are drively connected. In a specific embodiment, the end of the first drive shaft 122 is constructed as a worm, and the end of the second drive shaft 21 is provided with a worm wheel. The first drive shaft 122 and the second drive shaft 21 are drively connected to the impeller assembly 12 and the meter assembly 2 through the worm wheel and worm gear transmission method.

[0033] The impeller 121 includes a shaft 123, multiple helical blades 124, and an outer peripheral connecting portion 125. The shaft 123 is located at the center of the impeller 121 and is rotatably connected to the shaft 14. Multiple blades 124 are circumferentially spaced around the outer periphery of the shaft 123 and extend radially outward. The root of each blade 124 is fixedly connected to the shaft 123, and the end of each blade 124 away from the shaft 123 is fixedly connected to the outer peripheral connecting portion 125. The shaft 123, blades 124, and outer peripheral connecting portion 125 are preferably integrally formed. The blades 124 have a generally torsional curved surface shape. The helix angle of each blade 124 gradually changes radially from the inner end to the outer end, and also gradually changes axially from the inlet end to the outlet end, giving the blades 124 better hydraulic performance in three-dimensional space.

[0034] The outer peripheral connecting portion 125 is a ring structure that surrounds the outer periphery of the blades 124. It is used to connect the outer ends of multiple blades 124 into a whole, so that the wheel shaft 123, multiple blades 124, and the outer peripheral connecting portion 125 form an integral structure. Through this structure, the outer peripheral connecting portion 125 connects the originally independent multiple blades 124 into a whole, which significantly enhances the overall structural strength and rigidity of the impeller 121. This makes the blades 124 less prone to deformation or vibration under the impact of water flow, and reduces the speed fluctuation caused by the vibration of the blades 124.

[0035] Specifically, the outer peripheral connecting portion 125 has a plurality of notches 128 arranged in a circumferential array, each notch 128 being arranged between two adjacent blades 124. Viewed from the outer periphery of the impeller assembly 12, the notch 128 has an approximately triangular outline. Specifically, one side of the notch 128 is flush with the surface of the blade 124 facing the water outlet, allowing water to flow smoothly along that side. The other side of the notch 128 connects to the end of the two adjacent blades 124 away from the axle 123, so that the outer peripheral connecting portion 125 still maintains the connection between adjacent blades 124 at the notch 128. In other words, this structure is equivalent to setting a triangular outer peripheral connecting portion 125 and a triangular notch 128 between adjacent blades 124, and the outer peripheral connecting portion 125 has an overall serrated annular shape. By adopting this partially open and partially connected structure, the outer peripheral connection 125 achieves continuous connection between the blades 124 in the area outside the notch 128, ensuring the overall rigidity and vibration resistance of the impeller 121. Simultaneously, each notch 128 provides an additional discharge channel for water flow, allowing for smooth discharge and effectively reducing the flow resistance at the outer end of the blades 124. Under low flow conditions, the notch 128 reduces water flow resistance during impeller 121 startup, improving Q1 sensitivity. Under high flow conditions, the notch 128 accelerates water discharge at the outlet, improving the negative error of Q3. Near the boundary flow rate Q2, the notch 128 makes the pressure distribution at the outer end of the blades 124 more uniform, facilitating a smooth transition of the error curve.

[0036] Reference Figure 5 and Figure 6 The end face of the blade 124 at the water inlet end is provided with a first inclined surface 126 that is inclined toward the water inlet side. In a preferred embodiment, the angle of the first inclined surface 126 is set to 15° to 30°. Under low flow conditions, the water flow energy is relatively weak. The inclination of the first inclined surface 126 toward the water inlet side allows the water flow to smoothly enter the working surface of the blade 124 along the first inclined surface 126, thereby improving the metering sensitivity of the minimum flow rate Q1.

[0037] The end face of the blade 124 at the water outlet is provided with a second inclined surface 127 that is tilted away from the water inlet side. In a preferred embodiment, the angle of the second inclined surface 127 is set to 10°–25°. Under high flow conditions, if the resistance at the water outlet of the impeller 121 is too high, it will cause the impeller 121 to rotate too slowly, resulting in a negative error. The second inclined surface 127, tilted away from the water inlet side, increases the water-facing area of ​​the blade 124, reduces the water flow resistance at the water outlet, and allows the water to leave the blade 124 more smoothly, thereby increasing the rotational speed of the impeller 121 under high flow conditions and effectively improving the negative error problem of Q3.

[0038] The first inclined plane 126 and the second inclined plane 127 work synergistically to achieve synchronous correction of errors at all flow rate points across the entire range. At the minimum flow rate Q1, the first inclined plane 126 significantly increases the starting torque and improves the negative error, while the second inclined plane 127 has virtually no impact, resulting in a significant improvement in the measurement accuracy at Q1. At the boundary flow rate Q2, the first inclined plane 126 optimizes the inlet water flow, and the second inclined plane 127 optimizes the outlet water flow. Together, they ensure a smooth transition of the error curve at Q2, guaranteeing a stable connection between the low and high flow zones. At the commonly used flow rate Q3, the second inclined plane 127 effectively controls the outlet resistance and reduces the negative error, while the first inclined plane 126 has virtually no impact, ensuring stable and reliable measurement at Q3.

[0039] Furthermore, the first inclined surface 126 and the second inclined surface 127 work together to improve the rotational stability of the impeller 121 in both axial and radial directions, compensating for the rotational imbalance caused by concentricity errors. In the axial direction, the first inclined surface 126 ensures stable adhesion of the water flow at the inlet, while the second inclined surface 127 optimizes the water flow separation angle at the outlet. Together, they suppress the axial movement of the impeller 121. In the radial direction, the first inclined surface 126 guides the water flow smoothly into the impeller, reducing radial disturbance at the inlet, while the second inclined surface 127 promotes smooth water discharge, weakening the radial force peak at the outlet. Together, they make the circumferential force on the blades 124 more uniform, significantly reducing radial oscillation caused by eccentricity.

[0040] The mechanism also includes an adjustment plate 15 fixed to the rectifier 11. The adjustment plate 15 is located in the water flow channel. By moving the adjustment plate 15, the angle of the water flow impacting the blades 124 can be adjusted, thereby adjusting the driving force of the impeller 121. When it is necessary to reduce the speed of the impeller 121, the angle of the adjustment plate 15 is appropriately increased to slow down the water flow impact angle. When it is necessary to increase the speed of the impeller 121, the angle of the adjustment plate 15 is appropriately decreased to make the water flow impact the working surface of the blades 124 more concentrated.

[0041] Reference Figure 5 and Figure 7In one specific implementation, a circular adjusting plate 151 is fixedly connected to one end of the adjusting plate 15, and the adjusting plate 151 is positioned above the rectifier 11. An elongated mounting hole 16 is formed on the outer wall of the rectifier 11, and the length direction of the mounting hole 16 is perpendicular to the length direction of the adjusting plate 15. The adjusting plate 15 extends into the water flow channel through the mounting hole 16, causing the adjusting plate 151 to abut against the outer wall of the rectifier 11, and the length direction of the adjusting plate 15 is parallel to the water flow direction.

[0042] Two symmetrical arc-shaped grooves 152 are formed on the adjusting plate 151. A fastener is inserted into each arc-shaped groove 152 and fixed to the rectifier 11 to fix the adjusting plate 15 to the rectifier 11. When it is necessary to adjust the water flow impact angle, the fastener is loosened, causing the adjusting plate 151 to rotate along the trajectory of the arc-shaped groove 152, thereby changing the angle of the adjusting plate 15 in the water flow channel. After adjustment, the fastener is tightened again to lock the adjusting plate 15 in the new angular position. When it is necessary to adjust the position of the entire adjusting plate 15, the fastener is loosened, causing the adjusting plate 15 to slide along the mounting hole 16 and be fixed.

[0043] This application also discloses a water meter, as shown in the embodiments. Figure 1 and Figure 8 The water meter includes a movement and a housing 3. The movement includes a rectifier 11, an impeller assembly 12, a mounting cover 13, and a meter head assembly 2. The housing 3 has openings at both ends for connection to external pipes. The rectifier 11, impeller assembly 12, and mounting cover 13 are assembled into a single unit and axially inserted into and fixed within the housing 3 through one opening. A mounting port 31 is provided on the peripheral sidewall of the housing 3, sized to allow only the meter head assembly 2 to pass through. The meter head assembly 2 is mounted on the housing 3 via the mounting port 31, and the transmission mechanism at the end of the meter head assembly 2 extends into the housing 3 and is connected to the impeller assembly 12. In one specific embodiment, the mounting port 31 is located above the housing 3, and the meter head assembly 2 is inserted in a direction perpendicular to the axis of the housing 3. Since the rectifier 11, impeller assembly 12 and mounting cover 13 are pre-integrated into an integral module and installed from the end of the housing 3, the assembly opening 31 does not need to be too large as in traditional water meters. It only needs to meet the installation requirements of the meter head assembly 2. The small opening design reduces the generation of eddies, which is beneficial to improving metering accuracy. At the same time, it enhances the structural strength of the housing 3 and facilitates reliable sealing.

[0044] The mounting cover 13 has an inlet 131 and an outlet 132 at its two ends, respectively. The inlet 131 of the mounting cover 13 is flush with the inlet end of the housing 3, and the end of the rectifier 11 is also flush with the inlet 131 of the mounting cover 13. This flush structure prevents eddies from forming due to uneven end faces during the process of water flow from the housing 3 into the mounting cover 13 and then into the rectifier 11, ensuring the stability of the water flow. At the same time, the flush end of the housing 3, the mounting cover 13, and the rectifier 11 can serve as a positioning reference for assembly, improving assembly efficiency and consistency.

[0045] 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. A movement comprising a rectifier (11) and an impeller assembly (12), characterized in that: The rectifier (11) and the impeller assembly (12) are arranged sequentially along the axial direction. The rectifier (11) is located on the water inlet side of the impeller assembly (12). The impeller assembly (12) is rotatably connected to the rectifier (11) via a rotating shaft (14). A mounting cover (13) is fitted around the outer periphery of the rectifier (11) and the impeller assembly (12). The rectifier (11) is fixedly connected inside the mounting cover (13). The impeller assembly (12) includes an impeller (121). The impeller (121) includes a shaft (123), a plurality of spiral blades (124), and an outer peripheral connecting... The connecting part (125) has multiple blades (124) circumferentially spaced on the outer periphery of the wheel shaft (123). The outer periphery connecting part (125) connects the outer peripheries of the multiple blades (124) into one piece. The outer periphery connecting part (125) has multiple notches (128) circumferentially arranged. The notches (128) are arranged between two adjacent blades (124). One side of the notch (128) is flush with the surface of the blade (124) facing the water outlet side. The other side of the notch (128) is connected to the end of the two adjacent blades (124) away from the wheel shaft (123).

2. The movement according to claim 1, characterized in that: The end face of the blade (124) at the water inlet end is provided with a first inclined surface (126) that is inclined toward the water inlet side, and the end face of the blade (124) at the water outlet end is provided with a second inclined surface (127) that is inclined away from the water inlet side.

3. The movement according to claim 1, characterized in that: The rectifier (11), impeller assembly (12) and mounting cover (13) are assembled as a whole and installed horizontally along the axial direction from one side of the water meter housing (3).

4. The movement according to claim 1, characterized in that: The rectifier (11) is fixedly connected to the water inlet end of the mounting cover (13), and the end of the rectifier (11) facing away from the impeller assembly (12) is flush with the water inlet end.

5. The movement according to claim 1, characterized in that: It also includes a meter head assembly (2). The peripheral sidewall of the water meter housing (3) is provided with an assembly port (31) for installing the meter head assembly (2). The end of the meter head assembly (2) extends into the water meter housing (3) through the assembly port (31) and is connected to the impeller assembly (12) in a transmission connection.

6. The movement according to claim 5, characterized in that: The mounting cover (13) has a protrusion (133) axially formed at one end facing the meter assembly (2). The interior of the protrusion (133) forms a receiving space for accommodating the transmission structure at the end of the impeller assembly (12). A positioning hole (134) is provided above the protrusion (133). The transmission mechanism at the end of the meter assembly (2) extends into the receiving space in the protrusion (133) through the positioning hole (134) to drive the transmission structure at the end of the impeller assembly (12).

7. The movement according to claim 1, characterized in that: It also includes an adjustment plate (15) fixed to the rectifier (11), the adjustment plate (15) being disposed in the water flow channel for adjusting the angle at which the water flow impacts the blade (124).

8. The movement according to claim 7, characterized in that: A circular adjusting plate (151) is fixedly connected to one end of the adjusting plate (15). An elongated mounting hole (16) is opened on the outer wall of the rectifier (11). The length direction of the mounting hole (16) is perpendicular to the length direction of the adjusting plate (15). The adjusting plate (15) extends into the water flow channel through the mounting hole (16), so that the adjusting plate (151) abuts against the outer wall of the rectifier (11). The length direction of the adjusting plate (15) is parallel to the water flow direction. Two arc-shaped grooves (152) are symmetrically opened on the adjusting plate (151). A fastener is inserted in each arc-shaped groove (152). The fastener passes through the arc-shaped groove (152) and is fixed on the rectifier (11) so that the adjusting plate (15) is relatively fixed to the rectifier (11).

9. A water meter, characterized in that: The movement includes the movement as described in any one of claims 1-8, and also includes a housing (3) having openings at both ends, wherein the water inlet end of the mounting cover (13) is flush with the water inlet end of the housing (3).

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