A dual lead vane helical water meter

Abstract

The application provides a double-lead vane helical water meter, and belongs to the technical field of water meters. The application is characterized in that a rectifier is arranged in a water passing cavity of a meter shell, and an impeller is arranged to rotate in the rectifier, meanwhile, a backwater surface of each double-lead vane on the impeller, which is away from an impact surface side, is arranged as a double-lead surface, and the cross-sectional thickness of each double-lead surface in the direction from water inlet to water outlet is smoothly thickened, so that the cross-sectional thickness of the double-lead surface near the water inlet end is smaller than that near the water outlet end, the water passing cross-sectional area between the two adjacent double-lead vanes can be smoothly and gradually changed, the stress direction of the double-lead vane in the water flow is finely adjusted, the stress environment when the water flow impacts and the impeller rotates is more in line with, the anti-interference performance of the water meter is better, and the stability is higher, so that the problem that the precision is not high due to that the surface state of the impeller vane in the existing water meter is only corrected according to experience is solved, and the use performance of the water meter is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water meters, in particular to a spiral water meter with double-lead blades. BACKGROUND

[0002] As a category of velocity water meters, spiral water meters are mainly used for water flow measurement of large-diameter pipelines. The spiral water meter works by rotating the spiral impeller through water flow impact, which drives the metering module to work and realizes metering.

[0003] At present, the spiral impeller of most spiral water meters on the market is usually a horizontal spiral structure, that is, the water flow flows along the axial direction of the impeller and impacts the impeller. For example, a new type of horizontal spiral detachable water meter disclosed in patent application CN118640986A has a flow straightener unit on the meter shell, a impeller assembly behind the flow straightener unit, which converts the rotational motion of the water flow into mechanical motion, and measures the water flow entering the water meter. At the same time, a water flow adjusting device is arranged on the flow straightener unit to adjust the flow direction of the water entering the water meter. In addition, the meter shell is provided with a water inlet, a water outlet and a flow channel between the water inlet and the water outlet. The flow straightener unit is arranged in the flow channel. At this time, the flow straightener unit includes a front flow straightener and a rear flow straightener. The front flow straightener is arranged at the water inlet, and the rear flow straightener is arranged behind the front flow straightener. The front flow straightener is used to eliminate the pre-rotation and vortex of the water flow at the water inlet, and the rear flow straightener is used to change the turbulent flow of the water flow into laminar flow to reduce the radial force on the impeller assembly. In addition, the impeller assembly includes an impeller and a worm, which is used to generate power under the impact of water flow and transmit the power generated by the impeller to the metering module to realize water flow metering. Although the existing spiral water meter can meet the metering requirements, the cross-sectional area of the blade of the impeller is fixed, and the flow direction in the flow channel is complex, resulting in complex force acting on the impeller. Therefore, it is difficult to accurately analyze the actual operation of the impeller, and the structure of the existing impeller can only be modified based on experience, which often has large errors and greatly affects the performance of the water meter. SUMMARY

[0004] In view of the above problems in the prior art, the present application provides a spiral water meter with double-lead blades. The back surface of each double-lead blade is set as a double-lead surface, and the cross-sectional thickness of the double-lead surface near the water inlet end is smaller than that near the water outlet end. The cross-sectional thickness of the back surface of each double-lead blade gradually increases in the direction from the water inlet to the water outlet, so that the water passing cross-sectional area between the adjacent double-lead blades gradually changes, the force direction of the water flow is adjusted, and the stability of the water meter is improved. The problem of large precision error caused by modification based on experience is solved, and the performance of the water meter is better.

[0005] The specific technical solutions are as follows:

[0006] A screw type water meter with double lead vanes comprises a meter shell, an impeller and a flow straightener, the meter shell has a water passing cavity, the meter shell is provided with a water inlet and a water outlet which are communicated with the water passing cavity respectively, the impeller is rotatably installed in the water passing cavity and the rotation axis is arranged along the direction from the water inlet to the water outlet, the flow straightener comprises a front straightener and a rear straightener, the front straightener and the rear straightener are arranged in the water passing cavity and are arranged at the water inlet and the water outlet respectively, the two ends of the rotation axis of the impeller are rotatably installed on the front straightener and the rear straightener respectively, and the impeller comprises a rotation axis, a wheel body and a plurality of double lead vanes, the wheel body is fixedly sleeved on the rotation axis, a plurality of double lead vanes are uniformly arranged on the wheel surface of the wheel body, the inner side of each double lead vane is fixed to the wheel body, each double lead vane is arranged along the helical line of the axial direction of the wheel body, and each double lead vane comprises an impact surface and a backwater surface, and each backwater surface is a double lead surface, and the cross-sectional area of the double lead surface gradually increases along the direction of the water flow.

[0007] The screw type water meter with double lead vanes, wherein each double lead surface comprises two side edges, the two side edges respectively constitute a first lead and a second lead of the double lead surface, one end of the two side edges intersects, the other end of the two side edges gradually diverges, the two side edges are helical lines arranged along the axial direction of the rotation axis, one end of the two side edges where the two side edges intersect is close to the water inlet, and the other end of the two side edges where the two side edges gradually diverge is close to the water outlet.

[0008] The screw type water meter with double lead vanes, wherein the included angle between the side edge of the double lead surface close to the impact surface and the end surface of one end of the wheel body is a first lead angle, the angle range of the first lead angle is 40-45°, the included angle between the side edge of the double lead surface away from the impact surface and the end surface of one end of the wheel body is a second lead angle, and the angle range of the second lead angle is 45-50°.

[0009] The screw type water meter with double lead vanes, wherein one end of the rotation axis is a worm structure, further comprising a worm wheel shaft, one end of the worm wheel shaft is engaged with the worm, and the other end of the worm wheel shaft extends to the counting indication mechanism.

[0010] The screw type water meter with double lead vanes, further comprising an adjuster, the adjuster comprises an adjusting shaft and an adjusting piece, one end of the adjusting shaft is rotatably installed on the flange cover of the water meter, the other end of the adjusting shaft extends into the water passing cavity and into the front straightener, one end of the adjusting piece is sleeved on the end of the adjusting shaft extending into the front straightener, and the adjusting piece and the adjusting shaft are circumferentially limited.

[0011] The double-lead vane screw water meter has a rear flow regulating portion, which comprises a barrel and a rear flow guiding portion, the barrel is sleeved in the water passing cavity, and the barrel has two side walls, each of which is provided with an inlet and an outlet corresponding to the water inlet and the water outlet respectively, and the rear flow guiding portion is arranged at the outlet, and the front flow regulating portion is embedded in the barrel and located at the inlet.

[0012] The double-lead vane screw water meter has a front filter portion, which is arranged in the water inlet, and comprises a filter seat, a filter screen and a vibration assembly, the filter seat is arranged in the water inlet, the filter seat is provided with a water passing hole in the center, and the filter screen is arranged on the filter seat and covers the water passing hole.

[0013] The double-lead vane screw water meter has a filter seat in the barrel structure, the water passing hole is arranged on the barrel bottom of the filter seat, the barrel opening of the filter seat is provided with a gland, the gland is in the annular structure, the inner side of the gland extends towards the barrel opening of the filter seat, the filter screen is arranged in the barrel inner cavity of the filter seat, and the outer side of the filter screen is provided with a spacing between the barrel inner wall of the filter seat.

[0014] The double-lead vane screw water meter has a front filter portion, which is arranged in the water inlet, and comprises a filter seat, a filter screen and a vibration assembly, the filter seat is arranged in the water inlet, the filter seat is provided with a water passing hole in the center, and the filter screen is arranged on the filter seat and covers the water passing hole.

[0015] The double-lead vane screw water meter has a front filter portion, which is arranged in the water inlet, and comprises a filter seat, a filter screen and a vibration assembly, the filter seat is arranged in the water inlet, the filter seat is provided with a water passing hole in the center, and the filter screen is arranged on the filter seat and covers the water passing hole.

[0016] The double-lead vane screw water meter has a front filter portion, which is arranged in the water inlet, and comprises a filter seat, a filter screen and a vibration assembly, the filter seat is arranged in the water inlet, the filter seat is provided with a water passing hole in the center, and the filter screen is arranged on the filter seat and covers the water passing hole.

[0017] The double-lead vane screw water meter has a front filter portion, which is arranged in the water inlet, and comprises a filter seat, a filter screen and a vibration assembly, the filter seat is arranged in the water inlet, the filter seat is provided with a water passing hole in the center, and the filter screen is arranged on the filter seat and covers the water passing hole. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application;

[0019] Figure 2 Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application;

[0020] Figure 3 Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application;

[0021] Figure 4 Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application;

[0022] Figure 5 Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application;

[0023] In the drawings: 1, meter shell; 11, water inlet; 12, water outlet; 2, impeller; 21, rotating shaft; 22, wheel body; 23, double-pitch blade; 231, impact surface; 232, double-pitch surface; 2321, first pitch; 2322, second pitch; 3, flow straightener; 31, front flow straightening part; 32, rear flow straightening part; 321, barrel body; 322, rear flow guiding part; 4, flange cover; 41, counting indication mechanism; 5, worm shaft; 6, adjuster; 61, adjusting shaft; 62, adjusting piece; 7, pre-filtering part; 71, filtering seat; 72, filtering screen; 73, turbulence seat; 711, water passage hole; 712, gland; 721, stress rib; 731, turbulence cylinder; 732, turbulence plate. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following embodiments are combined with the accompanying drawings to further describe the present application. Figure 1 to the accompanying drawings Figure 5 The technical solutions provided by the present application are described in detail below, but the following content is not a limitation of the present application.

[0025] Figure 1 Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application; Figure 2 Structure diagram of an embodiment of a double-pitch blade helical water meter of the present application; Figure 1 and Figure 2 As shown in the drawings, the double-pitch blade helical water meter provided by the present embodiment includes a meter shell 1, an impeller 2, and a flow straightener 3.

[0026] Specifically, the watch case 1 is provided with a water passing cavity, at this time, the water passing cavity is provided with an upper opening, which is convenient for the subsequent installation of the impeller 2, the flow regulator 3 and the like in the water passing cavity, at the same time, the flange cover 4 is arranged on the upper opening of the water passing cavity, the upper opening is closed through the flange cover 4, and the flange cover 4 also serves as a mounting carrier of the subsequent counting indication mechanism 41 and the like. In addition, the water inlet 11 and the water outlet 12 which are both communicated with the water passing cavity are arranged on both sides of the watch case 1, water enters the water passing cavity from the water inlet 11 and then flows out from the water outlet 12. The impeller 2 is rotatably arranged in the water passing cavity, and the rotating shaft 21 is arranged along the direction from the water inlet 11 to the water outlet 12, forming a traditional horizontal spiral wing type water meter structure, so that the impact of water can drive the impeller 2 to rotate to meet the metering requirement. At this time, the flow regulator 3 includes the front flow regulating part 31 and the rear flow regulating part 32, and the front flow regulating part 31 and the rear flow regulating part 32 are arranged in the water passing cavity and arranged at the water inlet 11 and the water outlet 12 respectively, so that the water entering the water passing cavity can be regulated by the flow regulator 3, preventing the influence of the flow disturbance on the rotation of the impeller 2 and improving the metering accuracy. In addition, the rotating shaft 21 of the impeller 2 is rotatably arranged on the front flow regulating part 31 and the rear flow regulating part 32 at both ends, and the front flow regulating part 31 and the rear flow regulating part 32 provide stable support carriers for both ends of the impeller 2, which can maintain the stability of the impeller 2 while meeting the installation of the impeller 2 in the water passing cavity.

[0027] Figure 3 A structure diagram of an impeller of a double-lead blade spiral wing type water meter of the application; Figure 4 A structure diagram of a double-lead blade of a double-lead blade spiral wing type water meter of the application. Figures 2 to 4As shown, the impeller 2 further comprises a rotating shaft 21, a wheel body 22 and a plurality of double-lead blades 23, at this time, the wheel body 22 is fixedly sleeved on the rotating shaft 21, so that the wheel body 22 rotates synchronously with the rotating shaft 21, which provides conditions for subsequent power transmission to the meter index mechanism through the rotating shaft 21. In addition, a plurality of double-lead blades 23 are uniformly arranged on the wheel surface of the wheel body 22, at this time, the plurality of double-lead blades 23 are arranged in a ring array with the rotating shaft 21 as the center, which ensures that the impeller 2 is stressed smoothly. In addition, the inner side of each double-lead blade 23 is fixed to the wheel body 22, so that the wheel body 22 and the rotating shaft 21 can be rotated when water impacts the double-lead blade 23, which provides conditions for subsequent metering. In addition, each double-lead blade 23 is arranged along the helical line of the axial direction of the wheel body 22, which meets the design requirements of the impeller 2 of the screw type water meter, thereby adapting to the metering requirements of water quantity in large-diameter pipelines. Moreover, each double-lead blade 23 comprises an impact surface 231 and a backwater surface. In the direction in which water flows from the water inlet 11 to the water outlet 12, the side of the double-lead blade 23 that is directly impacted by water is defined as the impact surface 231, and the side of the double-lead blade 23 that is opposite to the impact surface 231 is defined 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 affect the metering. At this time, each backwater surface is defined as a double-lead surface 232, and the cross-sectional area of the double-lead surface 232 gradually increases in the direction of water flow, so that the cross-sectional thickness of each double-lead blade 23 gradually and smoothly increases in the direction from the water inlet to the water outlet, thereby enabling the water passing area between two adjacent double-lead blades 23 to gradually change, thereby realizing the fine adjustment of the double-lead blade 23 in the direction of water flow stress, improving the adaptability at high and low flow rates, thereby improving the stability of the water meter, solving the problem of large precision error caused by relying on experience for correction, and making the water meter performance better.

[0028] More specifically, each double-lead surface 232 on each double-lead blade 23 comprises two sides, which respectively constitute a first lead 2321 and a 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, and both sides are helical lines arranged along the axial direction of the rotating shaft 21, which meets the design requirements of the screw type blade and also realizes that the distance between the two sides gradually increases in the direction from the water inlet to the water outlet, so that the thickness of the double-lead surface 232 can gradually change. Moreover, one end of the two sides that intersects is close to the water inlet, and one end of the two sides that gradually diverges is close to the water outlet, so that when water passes between the double-lead surface 232 and the impact surface 231, the direction of water flow stress can be fine adjusted, so that the impeller 2 can better adapt to high-speed and low-speed water flow environment, maintain the stability of the impeller 2, and make the use performance of the water meter more stable.

[0029] More specifically, the angle between the side edge of the double-lead surface 232 close to the impact surface 231 and the end surface of one end of the wheel body 22 is a first lead angle 2321, and the angle range of the first lead angle 2321 is 40-45°, which can better adapt to the water flow impact, so that the water flow has a greater thrust on the double-lead blade 23, thereby improving the sensing ability of the impeller 2. Preferably, the first lead angle 2321 is 44°. At the same time, the angle between the side edge of the double-lead surface 232 away from the impact surface 231 and the end surface of one end of the wheel body 22 is a second lead angle 2322, and the angle range of the second lead angle 2322 is 45-50°, so that the second lead angle 2322 is slightly larger than the first lead angle 2321, so that the cross-sectional thickness of the double-lead surface 232 can be gradually changed, and at the same time, the large angle change is also avoided to cause too large an impact on the water flow, thereby improving the stability while ensuring the metering. Preferably, the second lead angle 2322 is 47°, which can better adapt to the water flow impact, and at the same time, can also meet the use demand of cross-sectional change.

[0030] More specifically, one end of the rotating shaft 21 is a worm structure, at this time, a worm shaft 5 is also provided, one end of the worm shaft 5 is engaged with the worm, so that when the water flow impacts the impeller 2 to rotate the rotating shaft 21, the transmission can be realized through the cooperation of the worm structure and the worm shaft 5, at the same time, the other end of the worm shaft 5 extends to the counting indicating mechanism 41, so that the rotation of the impeller 2 can be smoothly transmitted to the counting indicating mechanism 41, thereby enabling the counting indicating mechanism 41 to count the rotation of the impeller 2, thereby counting the water consumption. It is worth noting that a plurality of transmission gears are provided between the worm shaft 5 and the counting indicating mechanism 41, through the mutual engagement of the plurality of transmission gears and the adjustment of the data such as gear ring, gear number, etc., the power transmission can be realized, and at the same time, the speed change can also be realized, which better meets the assembly demand of the counting indicating mechanism 41.

[0031] More specifically, an adjuster 6 is also provided in the water passage, the adjuster 6 includes an adjusting shaft 61 and an adjusting piece 62, one end of the adjusting shaft 61 is rotatably installed on the flange cover 4 of the water meter, thereby realizing the stable installation of the adjusting shaft 61, and at the same time, the subsequent operator can also conveniently rotate the adjusting shaft 61. And the other end of the adjusting shaft 61 extends into the water passage and into the front flow regulating portion 31, and one end of the adjusting piece 62 is sleeved on the end of the adjusting shaft 61 extending into the front flow regulating portion 31, and the adjusting piece 62 and the adjusting shaft 61 are circumferentially limited, so that the adjusting shaft 61 can drive the adjusting piece 62 to deflect when rotating, so that the angle of the adjusting piece 62 can be changed by rotating the adjusting shaft 61, thereby changing the water inlet direction and the effect of the water flow on the impeller 2, thereby meeting the adjustment demand and providing conditions for improving the performance of the water meter.

[0032] More specifically, the rear rectifier part 32 of the rectifier 3 further comprises a barrel 321 and a rear flow guide part 322, the barrel 321 is sleeved in the water passage, which realizes the isolation of the water passage, so that the rectifier part can form a module structure, which provides conditions for the subsequent installation of the impeller 2 and other structures in the rectifier part to realize overall disassembly. In addition, the barrel 321 is provided with an inlet and an outlet corresponding to the water inlet 11 and the water outlet 12 on the two side walls respectively, the rear flow guide part 322 is arranged at the outlet, and the front rectifier part 31 is embedded in the barrel 321 and located at the inlet, and the impeller 2 is installed in the barrel 321, and the both ends of the rotating shaft 21 of the impeller 2 are rotatably installed on the front rectifier part 31 and the rear flow guide part 322, so that the water flowing from the water inlet 11 enters the front rectifier part 31 through the inlet, and the water flow direction is adjusted by the front rectifier part 31, which reduces the influence of turbulent flow on the rotation of the impeller 2. In addition, the water flow after the impeller 2 can be guided out through the rear flow guide part 322 of the rear rectifier part 32, which can also reduce the influence on the rotation of the impeller 2, and the water guided out from the rear flow guide part 322 can be discharged through the outlet and the water outlet 12, which meets the test requirements.

[0033] Figure 5 It is a sectional view of the front filter part of a double-lead blade screw type water meter of the application. As shown in Figures 2 to 5 The water inlet 11 of the watch case 1 is also provided with a front filter part 7, which realizes the pre-filtering of the water flowing into the water meter, prevents the excessive entry of sand, rust and other impurities in the water into the water meter to affect the metering of the water meter, and reduces the impurities in the water. At this time, the front filter part 7 comprises a filter seat 71 and a filter screen 72, the filter seat 71 is installed in the water inlet 11, the center of the filter seat 71 is provided with a water passage hole 711, and the filter screen 72 is installed on the filter seat 71 and covers the water passage hole 711, so that the water entering the water meter from the water inlet 11 can be filtered through the filter screen 72 first, and then flows into the front rectifier part 31 from the water passage hole 711, and then impacts the impeller 2 after being rectified by the front rectifier part 31, which can realize filtering and avoid affecting the rotation of the impeller 2, and the structure design is more reasonable.

[0034] More specifically, the filter seat 71 of the pre-filtering part 7 is in the structure of a barrel 321, and the water passing hole 711 is arranged on the barrel bottom of the filter seat 71. At this time, the gland 712 is arranged at the barrel opening of the filter seat 71, and preferably, the gland 712 is screwed on the filter seat 71. Moreover, the gland 712 is in the annular structure, and the inner side of the gland 712 extends towards the inside of the barrel opening of the filter seat 71, so that the stopper is formed at the barrel opening of the filter seat 71 by the gland 712. At this time, the filter screen 72 is arranged in the barrel inner cavity of the filter seat 71, and the two sides of the filter screen 72 are in contact with the barrel bottom of the filter seat 71 and the gland 712 respectively, so that the axial movement of the filter screen 72 is limited, the covering of the filter screen 72 on the water passing hole 711 is ensured, and the filtering effect is ensured. At the same time, the interval is arranged between the outer side of the filter screen 72 and the inner wall of the barrel of the filter seat 71, so that the filter screen 72 can move in the barrel inner cavity of the filter seat 71, and the vibration of the filter screen 72 is provided.

[0035] More specifically, the pre-filtering part 7 also has the turbulence seat 73, and at this time, the turbulence seat 73 is arranged on the gland 712 and located at the end of the gland 712 close to the water inlet 11, so that the water passes through the turbulence seat 73 first and then passes through the filter screen 72, and the vibration of the filter screen 72 is provided. The turbulence seat 73 includes the turbulence cylinder 731 and a plurality of turbulence plates 732. One end of the turbulence cylinder 731 is fixedly installed on the gland 712, and preferably, the turbulence cylinder 731 is in the one-piece structure with the gland 712, so that the structural strength is higher and the disassembly and assembly are facilitated. The plurality of turbulence plates 732 are arranged in the end of the turbulence cylinder 731 away from the gland 712, and the arrangement directions of the plurality of turbulence plates 732 are all different, so that the plurality of turbulence plates 732 are distributed in disorder in the turbulence cylinder 731. When the water passes through the turbulence seat 73, the water flow in multiple directions is formed and impacts the filter screen 72, so that the filter screen 72 can move in the barrel inner cavity of the filter seat 71 and collide with the inner wall of the barrel inner cavity of the filter seat 71 to shake off the impurities adsorbed on the filter screen 72, effectively reduces the risk that the mesh holes of the filter screen 72 are blocked by the impurities such as mud, delays the time when the mesh holes of the filter screen 72 are blocked, makes the use cycle of the pre-filtering part 7 longer, reduces the frequency of cleaning the pre-filtering part 7, and reduces the work burden.

[0036] More specifically, a plurality of stress ribs 721 are arranged on the filter screen 72 and close to one side of the spoiler seat 73, and the arrangement directions of the plurality of stress ribs 721 on the filter screen 72 are different, so that the plurality of stress ribs 721 are also irregularly distributed on the filter screen 72. When the water flow generated by the spoiler seat 73 impacts the filter screen 72 in different directions, the contact area with the water flow can be increased by the stress ribs 721, thereby increasing the moving speed of the filter screen 72, so that the filter screen 72 can quickly impact the barrel inner cavity of the filter seat 71, and the shaking effect of the filter screen 72 is improved. In addition, since the arrangement directions of the plurality of stress ribs 721 on the filter screen 72 are different, the stress on the filter screen 72 will change after the filter screen 72 moves, thereby changing the moving direction of the filter screen 72, so that the filter screen 72 is forced to move irregularly, ensuring that the filter screen 72 can move in the presence of water flow, and the structure design is more reasonable. It should be pointed out that since the water passes through the filter screen 72 first passes through the water passing hole 711, and then passes through the front rectifier 31 for rectification, the influence of the turbulence formed during the filtration on the impeller 2 can be avoided, and the metering performance of the water meter can still be ensured.

[0037] The double-lead blade screw type water meter provided by the embodiment comprises a meter shell 1, an impeller 2, and a rectifier 3. The rectifier 3 is arranged in the water passing cavity of the meter shell 1, and the impeller 2 is rotatably arranged in the rectifier 3. The backwater surface of each double-lead blade 23 of the impeller 2 away from the impact surface 231 is arranged as a double-lead surface 232, and the cross-sectional thickness of each double-lead surface 232 in the direction from water inlet to water outlet is smoothly thickened. The cross-sectional thickness of the double-lead surface 232 close to the water inlet end is smaller than that close to the water outlet end, so that the water passing cross-sectional area between the adjacent two double-lead blades 23 can be smoothly and gradually changed, the stress direction of the double-lead blade 23 in the water flow is finely adjusted, and the stress environment when the water flow impacts and the impeller 2 rotates is better met, so that the anti-interference performance of the water meter is better, and the stability is higher. Therefore, the problem that the precision is not high due to that the surface state of the blade of the impeller 2 is only corrected according to experience in the existing water meter is effectively solved, and the use performance of the water meter is further improved.

[0038] The above is only the preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application. It should be realized by those skilled in the art that any equivalent replacement and obvious change made according to the content of the present application should be included in the protection scope of the present application.

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 on 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. 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. 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°.

2. 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.

3. 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.

4. 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.

5. 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.

6. The rotor-type water meter with dual-lead blades according to claim 5, 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.

7. The rotor-type water meter with dual-lead blades according to claim 6, 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.

8. The rotor-type water meter with dual-lead blades according to claim 7, 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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