Helical vane type water meter with double-lead vanes

Abstract

The invention provides a helical vane type water meter with double-lead vanes, and belongs to the technical field of water meters. The rectifier is arranged in the water passing cavity of the meter shell, the impeller is rotationally arranged in the rectifier, meanwhile, the downstream face of the side, away from the impact face, of each double-lead blade on the impeller is arranged to be the double-lead face, and the thickness of the cross section of each double-lead face in the direction from water inlet to water outlet is smoothly increased; the thickness of the cross section, close to the water inlet end, of the double-lead face is smaller than that of the cross section, close to the water outlet end, of the double-lead face, so that the water passing sectional area between every two adjacent double-lead blades can be stably and gradually changed, the stress direction of the double-lead blades in water flow is finely adjusted, the stress environment during water flow impact and impeller rotation is better met, and the service life of the impeller is prolonged. The anti-interference performance of the water meter is better, the stability is higher, the problem that the precision is not high due to the fact that the surface state of blades of an impeller in an existing water meter is corrected only depending on experience is effectively solved, and the use performance of the water meter is further improved.

Description

Technical Field

[0001] This invention relates to the field of water meter technology, specifically to a rotor-type water meter with dual-lead blades. Background Technology

[0002] As a type of velocity water meter, the rotor water meter is mainly used for measuring water flow in large-diameter pipes. It works by rotating a spiral impeller caused by the impact of water flow, which in turn drives the metering module to work and achieve metering.

[0003] Currently, most helical impellers on the market are typically horizontal helical structures, meaning the water flows along the impeller's axial direction and impacts it. For example, patent application CN118640986A discloses a novel horizontal helical detachable water meter with a rectifier unit on the meter casing. Behind the rectifier unit is an impeller assembly, which converts the rotational motion of the water flow into mechanical motion to measure the flow rate entering the meter. Simultaneously, a flow regulating device is installed on the rectifier unit to adjust the direction of the water flow entering the meter. Furthermore, the meter casing has an inlet, an outlet, and a flow channel between the inlet and outlet. The rectifier unit is placed within the flow channel. This unit comprises a front rectifier and a rear rectifier. The front rectifier is located at the inlet, and the rear rectifiers are positioned behind it. The front rectifier eliminates pre-swirl and eddies in the inlet flow, while the rear rectifier transforms the turbulent flow into laminar flow, reducing the radial force on the impeller assembly. The impeller assembly includes an impeller and a worm. The impeller rotates under the impact of the water flow to generate power, and the worm transmits this power to the metering module for flow measurement. Although existing rotor-type water meters can meet metering requirements, the fixed cross-sectional area of ​​the impeller blades and the complex flow direction within the flow channel result in complex forces acting on the impeller. This makes accurate analysis of the actual operating conditions difficult, forcing existing impeller structures to rely on empirical adjustments, often leading to significant errors and negatively impacting meter performance. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this paper aims to provide a rotor-type water meter with dual-lead blades. The backwater surface of each dual-lead blade is configured as a dual-lead surface, and the cross-sectional thickness of the dual-lead surface near the water inlet is smaller than that near the water outlet. This results in a smooth increase in the cross-sectional thickness of the backwater surface of each dual-lead blade along the direction from water inlet to outlet. Consequently, the cross-sectional area between adjacent dual-lead blades gradually changes, enabling fine-tuning of the force direction of the water flow. This improves the stability of the water meter and solves the problem of large accuracy errors caused by relying solely on experience for correction, resulting in better water meter performance.

[0005] The specific technical solutions are as follows: A dual-lead blade propeller-type water meter includes a casing, an impeller, and a rectifier. The casing has a water passage cavity, and inlets and outlets, both communicating with the water passage cavity, are respectively provided on both sides of the casing. The impeller is rotatably mounted in the water passage cavity, with its shaft arranged along the direction from the inlet to the outlet. The rectifier includes a front rectifier and a rear rectifier, which are disposed in the water passage cavity and respectively at the inlet and outlet. The two ends of the impeller's shaft are rotatably mounted on the front and rear rectifiers, respectively. The rectifier section has the following features: the impeller includes a shaft, a wheel body, and several double-lead blades. The wheel body is fixedly sleeved outside the shaft. Several double-lead blades are evenly arranged on the wheel surface of the wheel body. The inner side of each double-lead blade is fixed to the wheel body. Each double-lead blade is arranged along a spiral line along the axial direction of the wheel body. Furthermore, each double-lead blade includes an impact surface and a backwater surface. Each backwater surface is a double-lead surface. Along the direction of water flow, the cross-sectional area of ​​the double-lead surface gradually increases.

[0006] The aforementioned dual-lead blade helical water meter includes two sides in each dual-lead surface, which respectively constitute the first lead and the second lead of the dual-lead surface. One end of the two sides intersects, and the other end of the two sides gradually diverges. Both sides are helical lines arranged along the axis of rotation. The end where the two sides intersect is the end closer to the water inlet, and the end where the two sides gradually diverge is the end closer to the water outlet.

[0007] In the aforementioned type of rotor water meter with dual-lead blades, the angle between the side of the dual-lead blades closest to the impact surface and the end face of one end of the wheel body is the first lead angle, and the angle range of the first lead angle is 40-45°; the angle between the side of the dual-lead blades away from the impact surface and the end face of one end of the wheel body is the second lead angle, and the angle range of the second lead angle is 45-50°.

[0008] In the aforementioned type of rotor water meter with double-lead blades, one end of the rotating shaft is a worm gear structure, and it also includes a worm wheel shaft. One end of the worm wheel shaft meshes with the worm gear, and the other end of the worm wheel shaft extends to the counting and indicating mechanism.

[0009] The aforementioned dual-lead blade spiral water meter further includes an adjuster, which comprises an adjusting shaft and an adjusting plate. One end of the adjusting shaft is rotatably mounted on the flange cover of the water meter, and the other end of the adjusting shaft extends into the water passage cavity and into the front rectifier section. One end of the adjusting plate is sleeved on the end of the adjusting shaft that extends into the front rectifier section, and the adjusting plate and the adjusting shaft are circumferentially limited.

[0010] The aforementioned dual-lead blade spiral water meter includes a rear rectifier section comprising a barrel and a rear guide section. The barrel is fitted inside the water passage cavity, and inlets and outlets corresponding to the inlet and outlet are respectively opened on the two side walls of the barrel. The rear guide section is located at the outlet, while the front rectifier section is embedded in the barrel and located at the inlet.

[0011] The aforementioned dual-lead blade rotor water meter further includes a pre-filter, which is installed inside the water inlet. The pre-filter includes a filter base, a filter screen, and a vibration assembly. The filter base is installed inside the water inlet, and a water passage hole is opened in the center of the filter base. The filter screen is installed on the filter base and covers the water passage hole.

[0012] In the aforementioned dual-lead blade spiral water meter, the filter base is a barrel structure with a water passage hole located on the bottom of the barrel. A pressure cap with an annular structure is provided at the opening of the barrel, and the inner side of the pressure cap extends into the opening of the barrel. The filter screen is located in the inner cavity of the barrel of the filter base, and both sides of the filter screen contact the bottom of the barrel and the pressure cap, respectively. A gap is provided between the outer edge of the filter screen and the inner wall of the barrel of the filter base.

[0013] The aforementioned dual-lead blade spiral water meter further includes a turbulence seat, which is disposed on the pressure cover and located at the end of the pressure cover near the water inlet. The turbulence seat includes a turbulence cylinder and a turbulence plate. One end of the turbulence cylinder is fixedly installed on the pressure cover, and the turbulence plates are all disposed in the end of the turbulence cylinder away from the pressure cover, and the arrangement directions of the turbulence plates are all different.

[0014] In the aforementioned type of rotor water meter with dual-lead blades, several stress-bearing ribs are provided on the side of the filter screen near the turbulence seat, and the arrangement direction of the stress-bearing ribs on the filter screen is different.

[0015] The positive effects of the above technical solution are: The aforementioned dual-lead blade rotor water meter, by designating the side of each dual-lead blade of the impeller away from the impact surface as the backwater surface, and the backwater surface being a dual-lead surface, and the cross-sectional thickness of each dual-lead surface smoothly increasing along the direction from water inlet to water outlet, makes the cross-sectional thickness of the dual-lead surface near the water inlet smaller than that near the water outlet. This allows the cross-sectional area of ​​water passage between adjacent dual-lead blades to change smoothly and gradually, thereby achieving fine adjustment of the force direction of the dual-lead blades in the water flow, resulting in better stability of the water meter. It effectively solves the accuracy error problem caused by the impeller blade surface of existing water meters relying solely on experience for correction, and improves the performance of the water meter. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of a rotor water meter with dual-lead blades according to the present invention. Figure 2 This is a cross-sectional view of a rotor water meter with dual-lead blades according to the present invention. Figure 3 This is a structural diagram of the impeller of a dual-lead blade spiral water meter according to the present invention; Figure 4 This is a structural diagram of the dual-lead blades of a rotor-type water meter according to the present invention. Figure 5 This is a cross-sectional view of the pre-filter section of a dual-lead blade spiral water meter according to the present invention.

[0017] In the attached diagram: 1. Casing; 11. Inlet; 12. Outlet; 2. Impeller; 21. Shaft; 22. Wheel body; 23. Double-lead blade; 231. Impact surface; 232. Double-lead surface; 2321. First lead; 2322. Second lead; 3. Rectifier; 31. Front rectifier; 32. Rear rectifier; 321. Barrel; 322. Rear guide; 4. Flange cover; 41. Counting indicator mechanism; 5. Worm gear shaft; 6. Adjuster; 61. Adjusting shaft; 62. Adjusting plate; 7. Pre-filter; 71. Filter base; 72. Filter screen; 73. Baffle base; 711. Water passage hole; 712. Pressure cap; 721. Stress rib; 731. Baffle cylinder; 732. Baffle plate. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 5 The technical solutions provided by this invention are described in detail, but the following content is not intended to limit this invention.

[0019] Figure 1 This is a structural diagram of an embodiment of a rotor water meter with dual-lead blades according to the present invention. Figure 2 This is a cross-sectional view of a rotor-type water meter with dual-lead blades according to the present invention. Figure 1 and Figure 2 As shown, the dual-lead blade spiral water meter provided in this embodiment includes: a casing 1, an impeller 2, and a rectifier 3.

[0020] Specifically, the meter housing 1 has a water passage cavity with an upper opening to facilitate the installation of the impeller 2, rectifier 3, and other components within it. A flange cover 4 is installed on the upper opening of the water passage cavity to seal it and also serves as a mounting carrier for the subsequent counting and indicating mechanism 41 and other structures. Additionally, an inlet 11 and an outlet 12, both communicating with the water passage cavity, are located on both sides of the meter housing 1. Water enters the water passage cavity through the inlet 11 and then flows out through the outlet 12. The impeller 2 is rotatably mounted within the water passage cavity, with its shaft 21 arranged along the direction from the inlet 11 to the outlet 12, forming a traditional horizontal rotor-type water meter structure. This allows the impact energy of the water to drive the impeller 2 to rotate, thus meeting the metering requirements. At this time, the rectifier 3 includes a front rectifier 31 and a rear rectifier 32, both of which are disposed within the water passage cavity and respectively at the inlet 11 and outlet 12. This allows the water entering the water passage cavity to be rectified by the rectifier 3, preventing turbulence from affecting the rotation of the impeller 2 and improving metering accuracy. Furthermore, the front rectifier 31 and the rear rectifier 32 are rotatably mounted on both ends of the impeller 2's shaft 21, providing stable support for both ends of the impeller 2. This ensures the stability of the impeller 2 even when installed within the water passage cavity.

[0021] Figure 3 This is a structural diagram of the impeller of a dual-lead blade spiral water meter according to the present invention; Figure 4 This is a structural diagram of the dual-lead blades in a rotor-type water meter according to the present invention. Figures 2 to 4As shown, the impeller 2 includes a shaft 21, a wheel body 22, and several double-lead blades 23. The wheel body 22 is fixedly fitted onto the shaft 21, allowing the wheel body 22 to rotate synchronously with the shaft 21, thus providing the conditions for transmitting power to the metering index mechanism via the shaft 21. Furthermore, several double-lead blades 23 are evenly arranged on the surface of the wheel body 22, forming a circular array around the shaft 21 to ensure stable force distribution on the impeller 2. Additionally, the inner side of each double-lead blade 23 is fixed to the wheel body 22, allowing water to impact the blades and drive the wheel body 22 and shaft 21 to rotate, providing the conditions for subsequent metering. Moreover, each double-lead blade 23 is arranged in a helical pattern along the axial direction of the wheel body 22, meeting the design requirements of the impeller 2 of the rotor-type water meter, thereby adapting to the water metering needs in large-diameter pipelines. Furthermore, each double-lead blade 23 includes an impact surface 231 and a backwater surface. In the direction where water enters from the inlet 11 and flows out from the outlet 12, the side of the double-lead blade 23 that directly impacts the water is designated as the impact surface 231. Conversely, the side of each double-lead blade 23 that is away from the impact surface 231 is designated as the backwater surface. At this time, when water passes between two adjacent double-lead blades 23, the water passes between the impact surface 231 of one double-lead blade 23 and the backwater surface of the other double-lead blade 23. That is, both the impact surface 231 and the backwater surface of the double-lead blade 23 have an impact on the metering. At this point, each backwater surface is set to be a double-lead surface 232. Along the direction of water flow, the cross-sectional area of ​​the double-lead surface 232 gradually increases, so that the cross-sectional thickness of each double-lead blade 23 gradually and smoothly increases in the direction from water inlet to water outlet. This allows the cross-sectional area between two adjacent double-lead blades 23 to gradually change, thereby realizing the fine adjustment of the double-lead blades 23 in the direction of water flow force, improving the adaptability under high and low flow rates, thereby improving the stability of the water meter, solving the problem of large accuracy error caused by relying solely on experience for correction, and making the water meter perform better.

[0022] More specifically, each double-lead surface 232 on each double-lead blade 23 includes two sides, which respectively form the first lead 2321 and the second lead 2322 of the double-lead surface 232. At this time, one end of the two sides intersects, and the other end of the two sides gradually diverges. Furthermore, both sides are helical lines arranged along the axis of rotation 21, which meets the design requirements of the rotor blade and also allows the distance between the two sides to gradually increase in the direction from water inlet to water outlet, thereby enabling the thickness of the double-lead surface 232 to gradually change. Moreover, the end where the two sides intersect is the end closer to the water inlet, and the end where the two sides gradually diverge is the end closer to the water outlet. This allows the direction of water flow force to be finely adjusted when water passes between the double-lead surface 232 and the impact surface 231, enabling the impeller 2 to better adapt to high-speed and low-speed water flow environments, maintain the stability of the impeller 2, and make the performance of the water meter more stable.

[0023] More specifically, the angle between the side of the double-lead surface 232 closest to the impact surface 231 and the end face of one end of the impeller 22 is the first lead angle 2321, and the angle range of the first lead angle 2321 is 40-45°. This better adapts to the impact of water flow, resulting in a greater thrust of water flow on the double-lead blade 23 and improving the impeller 2's sensing ability. Preferably, the first lead angle 2321 is 44°. Simultaneously, the angle between the side of the double-lead surface 232 away from the impact surface 231 and the end face of one end of the impeller 22 is the second lead angle 2322, and the angle range of the second lead angle 2322 is 45-50°. This makes the second lead angle 2322 slightly larger than the first lead angle 2321, allowing for a gradual change in the cross-sectional thickness of the double-lead surface 232. This also avoids excessive angle changes from causing excessive impact on water flow, improving stability while ensuring metering. Preferably, the second lead angle is 47°, which can better adapt to the impact of water flow and also meet the usage requirements of cross-sectional changes.

[0024] More specifically, one end of the rotating shaft 21 is a worm gear structure. A worm wheel shaft 5 is also provided, with one end meshing with the worm. When water flow impacts the impeller 2, causing the rotating shaft 21 to rotate, transmission is achieved through the cooperation of the worm gear structure and the worm wheel shaft 5. Simultaneously, the other end of the worm wheel shaft 5 extends to the counting and indicating mechanism 41, allowing the rotation of the impeller 2 to be smoothly transmitted to the counting and indicating mechanism 41. This enables the counting and indicating mechanism 41 to count the rotation of the impeller 2, thereby calculating water consumption. It is worth noting that several transmission gears are provided between the worm wheel shaft 5 and the counting and indicating mechanism 41. Through the meshing of these transmission gears and adjustments to the gear ring and number of teeth, power transmission and speed variation are achieved simultaneously, better adapting to the assembly requirements of the counting and indicating mechanism 41.

[0025] More specifically, an adjuster 6 is also provided in the water passage cavity. The adjuster 6 includes an adjusting shaft 61 and an adjusting plate 62. One end of the adjusting shaft 61 is rotatably mounted on the flange cover 4 of the water meter, achieving stable installation of the adjusting shaft 61 and facilitating subsequent rotation of the adjusting shaft 61 by operators. Furthermore, the other end of the adjusting shaft 61 extends into the water passage cavity and into the front rectifier 31, and one end of the adjusting plate 62 is sleeved on the end of the adjusting shaft 61 that extends into the front rectifier 31. The adjusting plate 62 and the adjusting shaft 61 are circumferentially limited, so that when the adjusting shaft 61 rotates, it can drive the adjusting plate 62 to deflect. This allows the angle of the adjusting plate 62 to be changed by rotating the adjusting shaft 61, thereby changing the water inlet direction and altering the effect of the water flow on the impeller 2, meeting the adjustment requirements and providing conditions for improving the performance of the water meter.

[0026] More specifically, the rear rectifier 32 of the rectifier 3 includes a barrel 321 and a rear guide 322. The barrel 321 is fitted inside the water passage cavity, achieving isolation of the water passage cavity and enabling the rectifier to form a modular structure. This provides the conditions for subsequent installation of structures such as the impeller 2 into the rectifier for overall assembly and disassembly. In addition, the barrel 321 has an inlet and an outlet on its two side walls, corresponding to the inlet 11 and the outlet 12, respectively. The rear guide 322 is located at the outlet. Meanwhile, the front rectifier 31 is embedded in the barrel 321 and located at the inlet. The impeller 2 is installed in the barrel 321, and the two ends of the shaft 21 of the impeller 2 are rotatably mounted on the front rectifier 31 and the rear guide 322, respectively. This allows water flowing in from the inlet 11 to enter the front rectifier 31 through the inlet. The front rectifier 31 adjusts the water flow direction, reducing the impact of turbulence on the rotation of the impeller 2. In addition, the water flow after passing through the impeller 2 can be discharged through the rear guide section 322 of the rear rectifier section 32, which can also reduce the impact on the rotation of the impeller 2. Furthermore, the water discharged from the rear guide section 322 can be discharged through the outlet and the outlet 12 to meet the test requirements.

[0027] Figure 5 This is a cross-sectional view of the pre-filter section of a dual-lead blade helical water meter according to the present invention. Figures 2 to 5 As shown, a pre-filter 7 is also provided inside the water inlet 11 of the housing 1. The pre-filter 7 pre-filters the water flowing into the water meter, preventing excessive entry of sediment, rust, etc. into the water meter and affecting the meter's measurement, while also reducing impurities in the water. The pre-filter 7 includes a filter base 71 and a filter screen 72. The filter base 71 is installed inside the water inlet 11, with a water passage hole 711 in its center. The filter screen 72 is installed on the filter base 71 and covers the water passage hole 711, allowing the water entering the water meter from the water inlet 11 to first pass through the filter screen 72 and then flow through the water passage hole 711 into the front rectifier 31. After being rectified by the front rectifier 31, the water impacts the impeller 2. This achieves filtration while avoiding interference with the rotation of the impeller 2, resulting in a more rational structural design.

[0028] More specifically, the filter seat 71 of the pre-filter unit 7 has a barrel structure 321, with a water passage hole 711 located on the bottom of the filter seat 71. A pressure cap 712 is provided at the opening of the filter seat 71, preferably threaded onto the filter seat 71. The pressure cap 712 has an annular structure, with its inner side extending towards the opening of the filter seat 71, forming a retaining edge at the opening of the filter seat 71. The filter screen 72 is then placed inside the barrel cavity of the filter seat 71, with both sides of the filter screen 72 contacting the bottom of the filter seat 71 and the pressure cap 712, respectively, restricting the axial movement of the filter screen 72 and ensuring that the filter screen 72 covers the water passage hole 711, thus guaranteeing the filtration effect. Meanwhile, a gap is provided between the outer edge of the filter screen 72 and the inner wall of the filter base 71, so that the filter screen 72 can move in the inner cavity of the filter base 71, providing conditions for the subsequent vibration of the filter screen 72.

[0029] More specifically, the pre-filter 7 also has a baffle seat 73. The baffle seat 73 is positioned on the pressure cap 712 and near the end of the pressure cap 712 closest to the water inlet 11, so that water passes through the baffle seat 73 before passing through the filter screen 72, providing conditions for subsequent vibration of the filter screen 72. The baffle seat 73 includes a baffle cylinder 731 and a baffle plate 732. One end of the baffle cylinder 731 is fixedly installed on the pressure cap 712. Preferably, the baffle cylinder 731 and the pressure cap 712 are an integral structure, resulting in higher structural strength and easier assembly and disassembly. If the flow disturbance plates 732 are all located in the end of the flow disturbance cylinder 731 away from the pressure cover 712, and if the arrangement directions of the flow disturbance plates 732 are not the same, the flow disturbance plates 732 are randomly distributed in the flow disturbance cylinder 731, so that when the water passes through the flow disturbance seat 73, it can form a multi-directional water flow and impact the filter screen 72. This allows the filter screen 72 to be subjected to forces in different directions, thereby allowing the filter screen 72 to move in the inner cavity of the filter seat 71 and to collide with the inner wall of the inner cavity of the filter seat 71, shaking off the impurities adsorbed on the filter screen 72. This effectively reduces the risk of impurities such as mud and sand clogging the mesh of the filter screen 72, delays the time when the mesh of the filter screen 72 is blocked, and makes the service life of the pre-filter 7 longer, reducing the frequency of cleaning the pre-filter 7 and reducing the workload.

[0030] More specifically, several force-bearing ribs 721 are provided on the side of the filter screen 72 near the baffle seat 73. These ribs 721 are arranged in different directions on the filter screen 72, resulting in a randomized distribution. This allows the ribs 721 to increase the contact area with the water flow generated by the baffle seat 73, thereby increasing the moving speed of the filter screen 72. This enables the filter screen 72 to quickly impact the inner cavity of the filter seat 71, enhancing the shaking effect of the filter screen 72. Furthermore, because the ribs 721 are arranged in different directions, the force on the filter screen 72 changes after it moves, thus changing its direction of movement. This forces the filter screen 72 to move randomly, ensuring that it can move whenever there is water flow, resulting in a more rational structural design. It is worth noting that since the water passes through the filter screen 72, then through the water passage hole 711, and then through the front rectifier 31 for rectification, the impeller 2 is not affected by the turbulence generated during filtration, and the metering performance of the water meter can still be guaranteed.

[0031] The dual-lead blade helical water meter provided in this embodiment includes a casing 1, an impeller 2, and a rectifier 3. The rectifier 3 is installed within the water passage cavity of the casing 1, and the impeller 2 is rotatably mounted within the rectifier 3. Simultaneously, the backwater surface of each dual-lead blade 23 on the impeller 2, facing away from the impact surface 231, is configured as a dual-lead surface 232. Furthermore, the cross-sectional thickness of each dual-lead surface 232 smoothly increases along the direction from water inlet to water outlet. This ensures that the cross-sectional thickness of the dual-lead surface 232 near the water inlet is smaller than that near the water outlet, allowing the water passage cross-sectional area between adjacent dual-lead blades 23 to gradually change. This fine-tunes the force direction of the dual-lead blades 23 in the water flow, better conforming to the force environment during water flow impact and impeller 2 rotation. This results in better anti-interference performance and higher stability of the water meter, effectively solving the problem of low accuracy caused by existing water meters where the impeller 2 blades rely solely on experience to correct their surface condition. This further improves the performance of the water meter.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotor-type water meter with dual-lead blades, comprising a casing, an impeller, and a rectifier, wherein the casing has a water passage cavity, and an inlet and an outlet, both communicating with the water passage cavity, are respectively provided on both sides of the casing; the impeller is rotatably mounted in the water passage cavity with its shaft arranged along the direction from the inlet to the outlet; the rectifier includes a front rectifier and a rear rectifier, the front rectifier and the rear rectifier being disposed in the water passage cavity and respectively at the inlet and the outlet; the two ends of the impeller's shaft are rotatably mounted on the front rectifier and the rear rectifier, respectively, characterized in that... The impeller includes a shaft, a wheel body, and several double-lead blades. The wheel body is fixedly sleeved on the outside of the shaft. Several double-lead blades are evenly arranged on the wheel surface of the wheel body. The inner side of each double-lead blade is fixed to the wheel body. Each double-lead blade is arranged along a spiral line along the axial direction of the wheel body. Furthermore, each double-lead blade includes an impact surface and a backwater surface. Each backwater surface is a double-lead surface. Along the direction of water flow, the cross-sectional area of ​​the double-lead surface gradually increases.

2. The rotor-type water meter with dual-lead blades according to claim 1, characterized in that, Each of the dual-lead surfaces includes two sides, which respectively constitute the first lead and the second lead of the dual-lead surface. One end of the two sides intersects, and the other end of the two sides gradually diverges. Both sides are helical lines arranged along the axis of rotation. The end where the two sides intersect is closer to the water inlet, and the end where the two sides gradually diverge is closer to the water outlet.

3. The dual-lead blade spiral water meter according to claim 2, characterized in that, The angle between the side of the dual lead surface near the impact surface and the end face of one end of the wheel body is the first lead angle, and the angle range of the first lead angle is 40-45°. The angle between the side of the dual lead surface away from the impact surface and the end face of one end of the wheel body is the second lead angle, and the angle range of the second lead angle is 45-50°.

4. The rotor-type water meter with dual-lead blades according to claim 1, characterized in that, One end of the rotating shaft is a worm gear structure, and it also includes a worm wheel shaft. One end of the worm wheel shaft meshes with the worm gear, and the other end of the worm wheel shaft extends to the counting indicator mechanism.

5. The rotor-type water meter with dual-lead blades according to claim 1, characterized in that, It also includes an adjuster, which includes an adjusting shaft and an adjusting plate. One end of the adjusting shaft is rotatably mounted on the flange cover of the water meter, and the other end of the adjusting shaft extends into the water passage cavity and into the front rectifier. One end of the adjusting plate is sleeved on the end of the adjusting shaft that extends into the front rectifier, and the adjusting plate and the adjusting shaft are circumferentially limited.

6. The rotor-type water meter with dual-lead blades according to claim 1, characterized in that, The rear rectifier includes a barrel and a rear guide section. The barrel is fitted inside the water passage cavity. The two side walls of the barrel are respectively provided with an inlet and an outlet corresponding to the water inlet and the water outlet. The rear guide section is located at the outlet. Meanwhile, the front rectifier is embedded in the barrel and located at the inlet.

7. The rotor-type water meter with dual-lead blades according to claim 1, characterized in that, It also includes a pre-filter, which is installed inside the water inlet. The pre-filter includes a filter base, a filter screen, and a vibration assembly. The filter base is installed inside the water inlet, and a water passage hole is opened in the center of the filter base. The filter screen is installed on the filter base and covers the water passage hole.

8. The rotor-type water meter with dual-lead blades according to claim 7, characterized in that, The filter base has a barrel structure. The water passage hole is located on the bottom of the filter base. A pressure cap is provided at the opening of the filter base. The pressure cap has an annular structure, and the inner side of the pressure cap extends into the opening of the filter base. The filter screen is located in the inner cavity of the filter base. Both sides of the filter screen are in contact with the bottom of the filter base and the pressure cap, respectively. There is a gap between the outer edge of the filter screen and the inner wall of the filter base.

9. The rotor-type water meter with dual-lead blades according to claim 8, characterized in that, It also includes a baffle seat, which is disposed on the pressure cover and located at the end of the pressure cover near the water inlet. The baffle seat includes a baffle cylinder and several baffle plates. One end of the baffle cylinder is fixedly installed on the pressure cover, and several baffle plates are disposed in the end of the baffle cylinder away from the pressure cover, and the arrangement directions of the several baffle plates are all different.

10. The dual-lead blade spiral water meter according to claim 9, characterized in that, Several stress-bearing ribs are provided on the side of the filter screen near the baffle seat, and the arrangement direction of the stress-bearing ribs on the filter screen is different.

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