Water meter variable pitch impeller assembly

Abstract

The invention provides a water meter variable-pitch impeller assembly which comprises an impeller shell, a water meter variable-pitch impeller, a water meter variable-pitch impeller, a water meter variable-pitch impeller and a water meter variable-pitch impeller. The multiple blades are evenly distributed in the circumferential direction, the blades are rotationally installed on the side wall of the impeller shell through blade shafts, and the rotating axes of the blades are perpendicular to and intersect with the axis of the impeller shell; the first bevel gear is arranged at the end part of the blade shaft; the inner barrel is fixed in the mounting cavity and is coaxial with the impeller shell; the second bevel gear is coaxial with the inner cylinder body, is rotatably mounted at the upper end of the inner cylinder body, and is meshed with each first bevel gear; and the motor is coaxially fixed in the inner barrel, the output end of the motor is connected with the second bevel gear and used for driving the second bevel gear to rotate, and then the deflection direction and the deflection angle of the blades can be adjusted. According to the variable-pitch impeller assembly of the water meter, the rotary blades are adopted, the deflection angle and direction of the blades can be accurately controlled, the variable-pitch impeller assembly can adapt to different water flow environments, the application range is wide, the service life is long, and bidirectional accurate metering can be achieved.

Description

Technical Field

[0001] The invention relates to a water meter, in particular to a variable pitch impeller assembly of a water meter. Background Art

[0002] The working principle of a water meter typically involves water flow driving an impeller (rotor or propeller) to rotate. The impeller's speed is proportional to the water velocity, which in turn drives a counter mechanism through a linkage component to record the amount of water passing through the meter. However, the impeller in this case does not have a "variable pitch" function, meaning its blade angle is fixed during operation and does not automatically adjust based on water flow conditions.

[0003] The blade angle of the impeller of a traditional water meter is fixed, which has the following shortcomings in the usage scenario:

[0004] 1. When the water flow velocity in the pipeline is too low, the impeller is not driven by sufficient force and cannot rotate or the resistance is too large, resulting in poor accuracy, which is manifested as a high starting flow rate; when the water flow velocity in the pipeline is too high, the impeller speed increases significantly, causing the support shaft and the sleeve of the impeller to be in a high-load friction state for a long time, accelerating mechanical wear and affecting the impeller's operating accuracy, reliability and service life.

[0005] 2. For larger water supply pipe network systems in industry, agriculture, or commerce, the water in the pipes will have design requirements for forward or reverse flow. Due to structural influences, the impeller of traditional water meters has unidirectional force and can only achieve unidirectional metering. During reverse metering, the reverse water flow will impact the blades at an undesigned angle, causing abnormal impeller speed, and thus making the metered value only about 50% of the actual flow rate. The error is extremely large, and bidirectional metering cannot be achieved, which cannot meet the use of bidirectional metering water pipe networks. Summary of the Invention

[0006] Technical problems to be solved

[0007] The technical problem to be solved by the present invention is to provide a water meter variable pitch impeller assembly which has a compact structure, reliable operation, can adjust the direction and angle of the blades and can adapt to different operating conditions.

[0008] Technical solutions to the problem

[0009] The present invention provides a water meter variable pitch impeller assembly, which includes:

[0010] An impeller shell, with impeller shafts at both ends, a sealed cavity formed inside the impeller shell and forming a mounting cavity 110;

[0011] There are multiple blades 12 that are evenly distributed around the circumference. The blades 12 are rotatably mounted on the side wall of the impeller shell via blade shafts 121, and their rotation axes are perpendicular to and intersect the axis of the impeller shell.

[0012] A first bevel gear 21 is mounted on the end of the blade shaft 121;

[0013] The inner cylinder 5 is fixed in the mounting cavity 110 and is coaxial with the impeller shell;

[0014] A second bevel gear 22 is coaxially and rotatably mounted on the upper end of the inner cylinder 5 and meshes with each of the first bevel gears 21;

[0015] The motor 6 is coaxially fixed in the inner cylinder 5 , and its output end is connected to the second bevel gear 22 and is used to drive the second bevel gear 22 to rotate, thereby being able to adjust the deflection direction and deflection angle of the blade 12 .

[0016] Furthermore, a pressing block 41 is provided at the end of the second bevel gear 22 , and the end of the pressing block 41 is fixedly connected to the end face of the mounting cavity 110 , and sliding bearings are provided between the contact surfaces of the second bevel gear 22 , the pressing block 41 and the inner cylinder 5 .

[0017] Furthermore, the sliding bearing includes a first sliding bearing 42 provided between the lower end of the pressing block 41 and the upper end of the second bevel gear 22 , and a second sliding bearing 43 provided between the lower end of the second bevel gear 22 and the upper end of the inner cylinder.

[0018] Furthermore, the first sliding bearing 42 and the second sliding bearing 43 are sheet-shaped annular structures, and their upper and lower surfaces serve as working surfaces.

[0019] Furthermore, the end surface of the pressing block 41 and the end surface of the inner cylinder 5 are provided with mounting grooves for mounting sliding bearings.

[0020] Furthermore, the inner wall of the inner cylinder 5 is provided with an annular protrusion and forms a mounting platform 51. The two end faces of the second bevel gear 22 are penetrated by arc-shaped limiting grooves 2210. There are at least two limiting grooves 2210 and they are evenly distributed circumferentially. The pin shaft or bolt 7 passes through the mounting platform 51 and the limiting grooves 2210 from bottom to top in sequence and is fixedly connected to the pressure block 41, and can realize axial and rotational limitation of the second bevel gear 22.

[0021] Furthermore, pin holes for inserting pin shafts or screw holes 412 corresponding to bolts are evenly distributed on the circumference of the pressing block.

[0022] Furthermore, the central angle of the limiting groove 2210 is greater than or equal to 30 degrees and less than or equal to 90 degrees.

[0023] Furthermore, the mounting platform 51 separates the inner cylinder 5 into an upper area and a lower area, and the end face of the motor 6 is fitted on the lower end face of the mounting platform 51 and fixed by bolts; the end of the second bevel gear 22 is provided with a cylindrical protrusion and forms a gear shaft 221, and the gear shaft 221 is rotatably mounted in the upper area.

[0024] Furthermore, there is rotation damping between the second bevel gear 22 and the inner cylinder 5 .

[0025] Furthermore, the motor 6 is a planetary reduction motor with a brake.

[0026] Furthermore, the rotation angle of the blade 12 is ±45 degrees.

[0027] Furthermore, a third bevel gear 23 is rotatably mounted on the outside of the inner cylinder 5, which is coaxial with the second bevel gear 22 and meshed with each of the first bevel gears 21. The first bevel gear 21 is located between the second bevel gear 22 and the third bevel gear 23. A limiting ring 82 is provided at the end of the third bevel gear 23 for axially limiting it. A first torsion spring 81 is provided between the limiting ring 82 and the third bevel gear 23. The first torsion spring 81 enables the third bevel gear 23 to drive the blade 12 to have a movement tendency to reset to a vertical state.

[0028] Furthermore, the limiting ring 82 is connected to the outside of the inner cylinder 5 through threads, and the side wall of the inner cylinder 5 is provided with a first retaining spring 84 for axially limiting the limiting ring 82 .

[0029] Furthermore, the end face of the limiting ring 82 is provided with a receiving groove 820 for accommodating the first torsion spring 81, and the receiving groove 820 is provided with a first clamping hole 821 for inserting the head of the first torsion spring 81, and the end face of the third bevel gear 23 is provided with a second clamping hole for inserting the tail of the first torsion spring 81.

[0030] Furthermore, the impeller shell includes a shell body 11 with open ends and an upper cover body and a lower cover body 33 respectively arranged at the two open ends of the shell body 11. The inner end surface of the upper cover body is provided with a first card groove that just accommodates the pressure block 41 to be embedded, and the upper cover body and the pressure block 41 are connected by bolts or pins; the inner end surface of the lower cover body is provided with a second card groove 333 that just accommodates the end of the inner cylinder 5 to be embedded, and the lower cover body and the inner cylinder 5 are connected by a pin 59.

[0031] Furthermore, the upper cover body includes a main upper cover 32 and an auxiliary upper cover 31. The edge of the main upper cover 32 is evenly distributed circumferentially with first mounting holes for connecting to the upper end of the shell 11. The upper surface of the main upper cover 32 is provided with a third slot 320 that just accommodates the auxiliary upper cover 31. The third slot 320 is provided with a second mounting hole 321 for connecting to the pressure block 41 and a first screw hole 322 for connecting to the auxiliary upper cover 31; the auxiliary upper cover 31 is provided with a third mounting hole 3110 corresponding to the first screw hole 322, and the upper end center of the auxiliary upper cover 31 is provided with a convex shaft to form a first impeller shaft 312.

[0032] Furthermore, the first screw hole 322 is a blind hole and is located outside the second mounting hole 321 . A sealing ring is provided between the third slot 320 and the auxiliary upper cover 31 , and the sealing ring is located between the first screw hole 322 and the second mounting hole 321 .

[0033] Furthermore, the second mounting hole 321 is a countersunk hole.

[0034] Furthermore, a pin hole 3330 is provided in the second slot 333 to accommodate the pin 59 and realize radial limitation.

[0035] Furthermore, the center of gravity of the impeller assembly is located on its axis.

[0036] Furthermore, there is a distance between the end of the motor 6 and the end surface of the installation cavity 110 to form a battery cavity, and a cylindrical battery electrically connected to the motor 6 is installed in the battery cavity.

[0037] Furthermore, an angle detection device for detecting the rotation angle of the second bevel gear 22 or the third bevel gear 23 is also included.

[0038] Furthermore, the angle detection device is a photoelectric encoder or a magnetic encoder.

[0039] Beneficial effects

[0040] The variable pitch impeller assembly of the water meter of the present invention adopts a rotating blade structure, which can realize the adjustment of the deflection angle and deflection direction of the blade. When the speed is too high, the blade inclination angle is reduced, the water resistance is reduced, the measurement accuracy is improved, the wear is reduced, and the service life is extended; when the speed is low, the blade inclination angle is increased, the water resistance is increased, the measurement stability is ensured, and the measurement range is increased; when the water flow direction changes and reverse water flow measurement is required, the blade is driven to deflect in the reverse direction, so that the reverse water flow impacts the impeller at a force angle, so that the impeller rotates normally, thereby realizing accurate reverse measurement, can adapt to different water flow environments, improve measurement accuracy, and has a wide range of applications; the split structure is adopted to reduce the difficulty of the production process and the manufacturing cost, and is easy to assemble, and is beneficial to improving the overall performance and reliability of the water meter; the pressure block structure is provided to ensure the installation stability of the inner cylinder and the bevel gear, and ensure the reliability of the impeller assembly; a sliding shaft is provided The bearing can improve the rotation stability of the bevel gear and avoid jamming, and the installation space is small, which is beneficial to the overall gear control; a third bevel gear and a torsion spring are provided, so that the third bevel gear has a movement tendency to drive the blade to reset to a vertical state, and the third bevel gear always has a tendency to push the first bevel gear to rotate, thereby enabling the gear teeth of the first bevel gear to always contact the gear teeth of the second bevel gear, eliminating the gap between the teeth, and avoiding the blades from swinging slightly at a small angle, thereby greatly improving the stability of the blades in the locked state, improving their rotation stability, avoiding the overall deflection caused by uneven force due to the swing of the blade angle, high metering accuracy, and can avoid wear of the assembly shaft, and long service life; the water meter variable pitch impeller assembly of the present invention adopts rotating blades, can accurately control the deflection angle and direction of the blades, can adapt to different water flow environments, has a wide range of applications, a long service life, and can achieve two-way precise metering. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of the structure of the variable pitch impeller assembly of the water meter of the present invention;

[0042] Figure 2 This is a schematic structural diagram of the variable pitch impeller assembly of a water meter according to the present invention from another angle;

[0043] Figure 3 is a cross-sectional view of the variable pitch impeller assembly of the water meter of the present invention;

[0044] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0045] Figure 5 Schematic diagram of the exploded structure of the variable pitch impeller assembly of the water meter of the present invention;

[0046] Figure 6 Schematic diagram of the connection of the bevel gears of the variable pitch impeller assembly of the water meter of the present invention;

[0047] Figure 7 This is a schematic diagram showing the connection of the bevel gears of the variable pitch impeller assembly of the water meter according to the present invention at another angle;

[0048] Figure 8 It is a cross-sectional view of the inner cylinder of the variable pitch impeller assembly of the water meter of the present invention;

[0049] Figure 9 for Figure 8 Enlarged view of middle part B;

[0050] Figure 10 for Figure 8 Enlarged view of middle C part;

[0051] Figure 11 for Figure 8 Enlarged view of the middle D part;

[0052] Figure 12 It is a structural schematic diagram of the limiting ring of the variable pitch impeller assembly of the water meter of the present invention;

[0053] Figure 13 A sectional view of the second bevel gear of the variable pitch impeller assembly of the water meter of the present invention;

[0054] Figure 14 It is a structural schematic diagram of a pressing block of a water meter variable pitch impeller assembly of the present invention;

[0055] Figure 15 This is a schematic structural diagram of the compression block of the variable pitch impeller assembly of the water meter according to the present invention from another angle;

[0056] Figure 16 It is a structural schematic diagram of the upper cover body of the variable pitch impeller assembly of the water meter of the present invention;

[0057] Figure 17 It is a structural schematic diagram of the lower cover of the variable pitch impeller assembly of the water meter of the present invention;

[0058] Figure 18 This is a schematic diagram of the first angle structure of the blades of the variable pitch impeller assembly of the water meter of the present invention;

[0059] Figure 19 This is a schematic diagram of the second angle structure of the blades of the variable pitch impeller assembly of the water meter of the present invention. DETAILED DESCRIPTION

[0060] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0061] See Figures 1-19 The present invention provides a water meter variable pitch impeller assembly, which includes an impeller shell, blades 12, an inner cylinder 5 and an adjustment component, and the center of gravity of the impeller assembly is located on its axis.

[0062] The impeller shell is cylindrical as a whole, and an impeller shaft is provided at the center of both ends of the impeller shell, which serves as the rotation fulcrum of the impeller assembly and as the input end of the water meter gear box. A gear is provided at the end of one of the impeller shafts, and a sealed cavity is formed in the impeller shell. The cavity is cylindrical and coaxial with the impeller shell, forming an installation cavity 110 for installing the inner cylinder 5 and the adjustment component.

[0063] There are multiple blades 12, usually 5-10, which are evenly distributed around the axis of the impeller shell. The blades 12 are rotatably mounted on the side wall of the impeller shell through blade shafts 121, and the rotation axis of the blade shafts 121 is perpendicular to and intersects the axis of the impeller shell.

[0064] The inner cylinder 5 is a cylindrical body, which is fixed in the installation cavity 110 and is coaxial with the impeller shell.

[0065] The adjustment assembly includes a first bevel gear 21, a second bevel gear 22 and a motor 6, wherein the number of the first bevel gears 21 is the same as that of the blade shaft 121, and the first bevel gear 21 is fixed to the end of the blade shaft 121, serving as the power end for the rotation of the blade 12; the second bevel gear 22 is coaxially arranged with the inner cylinder 5, and is rotatably mounted on the upper end of the inner cylinder 5, and the tooth surface of the second bevel gear 22 is simultaneously engaged with the tooth surface of each first bevel gear 21.

[0066] The motor 6 is fixed in the inner cylinder 5 and serves as the power end of the adjustment component. In the present application, the motor 6 is cylindrical and coaxial with the inner cylinder 5 to ensure the center of gravity position. The output end of the motor 6 is connected to the second bevel gear 22 to drive the second bevel gear 22 to rotate, thereby driving the first bevel gear 21 to rotate, thereby realizing the rotation of the blade shaft 121, and finally realizing the adjustment of the deflection direction and deflection (tilt) angle of the blade 12 to meet different working conditions. For example, when the speed is too high, the blade tilt angle is reduced, the water resistance is reduced, the measurement accuracy is improved and the wear is reduced; when the speed is low, the blade tilt angle is increased, the water resistance is increased, the measurement stability is ensured, and the service life is extended; when the water flow direction changes and reverse water flow metering is required, the blade is driven to deflect in the opposite direction. For example, during forward metering, the upper end of the blade tilts to the left, see Figure 18 , when measuring in reverse, the upper end of the blade tilts to the right, see Figure 19 , that is, the deflection direction of the blade changes, so that the reverse water flow hits the impeller at the force angle, causing the impeller to rotate normally, thereby achieving accurate reverse metering.

[0067] In this application, motor 6 is a planetary reduction motor with a brake. On the one hand, the planetary reduction motor can control the overall center of gravity position so that the center of gravity is located on the axis of the impeller assembly. On the other hand, by decelerating, it can reduce the speed and improve the adjustment accuracy. At the same time, it can increase the torque and driving force to ensure the stability and reliability of the adjustment component.

[0068] In the present application, a spline is provided on the output shaft of the motor 6, and a spline groove is provided on the second bevel gear. The two are connected by the spline to ensure a smooth and gap-free connection, thereby improving the overall accuracy.

[0069] The planetary reduction motor with brake has a braking function after power failure to lock the second bevel gear. That is, after the adjustment is completed, the angle of the blade can be locked to ensure the stability of the blade angle, prevent angle deviation caused by water impact, and improve measurement accuracy.

[0070] In this application, the blade 12 is at a vertical angle (parallel to the axis of the shell) as the reference state, that is, 0 degrees. The blade 12 can rotate to both sides to achieve left rotation or right rotation. The rotation angle of the blade 12 is ±45 degrees, that is, it can be deflected 45 degrees to the left or 45 degrees to the right, which can meet different operating conditions and forward and reverse bidirectional measurement.

[0071] In the present application, an inner cylinder 5 is provided in the impeller shell as an installation carrier of the adjustment component. In order to reduce the difficulty of the production process, facilitate assembly, and improve the installation stability of the inner cylinder 5 in the impeller shell to avoid deflection, in the present application, a pressure block 41 is provided at the upper end of the second bevel gear 22. The pressure block 41 is cylindrical and coaxial with the inner cylinder 5. The end of the pressure block 41 is fixedly connected to the end face of the installation cavity 110, and the lower end thereof contacts the second bevel gear 22, thereby realizing axial limitation of the second bevel gear 22 and ensuring the meshing degree of the second bevel gear and the first bevel gear.

[0072] In order to reduce the friction between the second bevel gear 22 and the pressure block 41 and the inner cylinder 5, improve the adjustment smoothness and avoid the jamming phenomenon, in the present application, sliding bearings are provided between the second bevel gear 22 and the pressure block 41, and between the contact surfaces with the inner cylinder 5. The sliding bearings are bearings that work under sliding friction; specifically, the sliding bearings include a first sliding bearing 42 and a second sliding bearing 43, wherein the first sliding bearing 42 is arranged between the lower end of the pressure block 41 and the upper end of the second bevel gear 22, and the second sliding bearing is arranged between the lower end of the second bevel gear 22 and the upper end of the inner cylinder; wherein the first sliding bearing 42 and the second sliding bearing 43 are sheet-like annular structures, And its upper and lower surfaces serve as working surfaces, which can achieve limiting and lubrication, reduce the friction of the second bevel gear between the pressure block and the inner cylinder, improve the smoothness of rotation, and reduce the load on the motor. At the same time, a sheet-like sliding bearing is used, which has a small installation space and is conducive to the size control of the impeller assembly; a mounting groove 411 is provided on the lower end face of the pressure block 41, and the mounting groove 411 is coaxial with the pressure block 41, which can just accommodate the first sliding bearing 42 to be embedded, and the depth is less than the thickness of the first sliding bearing 42, which can achieve radial limiting of the first sliding bearing 42 and is convenient; at the same time, an annular mounting groove is also provided on the end face of the inner cylinder to accommodate the second sliding bearing 43.

[0073] In order to facilitate the installation of the motor, the second bevel gear 22 and the pressure block, in this application, an annular protrusion is provided on the inner wall of the inner cylinder 5, which forms a mounting platform 51. The lower end surface of the mounting platform 51 serves as the lower mounting surface, and a countersunk hole is opened on the lower mounting surface. The countersunk holes are multiple and evenly distributed circumferentially. At the same time, arc-shaped limiting grooves 2210 are passed through the two end surfaces of the second bevel gear 22. There are at least two limiting grooves 2210, which are evenly distributed circumferentially around the axis of the second bevel gear 22. The pin shaft or bolt 7 passes through the mounting platform 51 (countersunk hole) and the limiting groove 2210 from bottom to top in sequence and is fixedly connected to the pressure block 41, thereby realizing axial limitation and rotation (stroke limitation) of the second bevel gear 22. Therefore, pins for inserting the pin shaft are evenly distributed circumferentially on the pressure block. Hole or screw hole 412 corresponding to the bolt; in the present application, there are three limiting grooves 2210 and they are evenly distributed circumferentially, and three circumferentially evenly distributed bolts are used to pass through the mounting platform 51 and the limiting groove 2210 from bottom to top and then connect with the three screw holes 412 on the lower surface of the pressing block, which makes the inner cylinder 5, the second bevel gear 22 and the pressing block form a whole, improves the compactness of the structure, facilitates assembly, and is beneficial to the center of gravity control; the central angle of the above-mentioned limiting groove 2210 is greater than or equal to 30 degrees and less than or equal to 90 degrees, which serves as a rotation limiting mechanism of the second bevel gear 22, for limiting the rotation stroke of the second bevel gear, and at the same time, the width of the limiting groove is close to the width of the bolt 7, which plays the role of a guide groove, improves the rotation stability of the second bevel gear 22, and avoids deflection.

[0074] The mounting platform 51 separates the inner cylinder 5 into an upper area and a lower area. The cross-sections of the upper area and the lower area are both circular, and the upper end of the upper area is open, and the lower end of the lower area is open. The two are connected by a center hole. The end face of the motor 6 is fitted on the lower end face of the mounting platform 51 and fixed by bolts. In this embodiment, the diameter of the motor 6 is smaller than the pitch circle diameter formed by each bolt 7, which facilitates the assembly of the motor and the bolts 7. When a pin is used to limit the second bevel gear 22, the size relationship between the motor 6 and the pitch circles of each pin can be ignored. The output shaft of the motor 6 passes through the center hole on the mounting platform 51 and is connected to the second bevel gear.

[0075] A cylindrical protrusion is provided at the end of the second bevel gear 22 to form a gear shaft 221. The gear shaft 221 is coaxial with the second bevel gear. The gear shaft 221 is rotatably installed in the upper area and contacts the inner wall of the upper area. In order to improve the rotation reliability and reduce wear, a cylindrical sleeve is provided between the gear shaft 221 and the inner wall of the upper area. The sleeve forms a sliding bearing, plays a wear-resistant role, reduces the friction between the two, and improves the rotation reliability.

[0076] In order to further improve the rotational stability of the second bevel gear, especially to avoid the impact generated at the moment of rotation, in the present application, there is a rotational damping between the second bevel gear 22 and the inner cylinder 5, that is, there is a certain resistance between the two, thereby improving the rotational stability of the second bevel gear and facilitating precision control.

[0077] In the present application, a third bevel gear 23 is rotatably mounted outside the inner cylinder 5. The third bevel gear 23 is located at the lower end of the second bevel gear 22 and is coaxial therewith. The tooth surface of the third bevel gear 23 is simultaneously meshed with each first bevel gear 21. Therefore, each first bevel gear 21 is located between the second bevel gear 22 and the third bevel gear 23. An annular limiting ring 82 is provided at the end of the third bevel gear 23 for axially limiting the third bevel gear 23 to ensure the meshing degree of the third bevel gear 23 with the first bevel gear 21. At the same time, in the present embodiment, a first torsion spring 81 is provided between the limiting ring 82 and the third bevel gear 23. The first torsion spring 81 enables the third bevel gear 23 to drive the blade 12 to have a movement tendency to reset to a vertical state, that is, when When the blade deflects to the left, it has a tendency to deflect the blade to the right; when the blade deflects to the right, it has a tendency to deflect the blade to the left. Even if the blade has a tendency to reset to a vertical state (0 degrees), since the blade is usually at a deflection angle when working, the third bevel gear always has a tendency to push the first bevel gear to rotate, so that the teeth of the first bevel gear 21 are always in contact with the teeth of the second bevel gear 22, eliminating the gap between the teeth and avoiding the blade from swinging slightly at a small angle, thereby greatly improving the stability of the blade in the locked state, improving its rotation smoothness, avoiding the overall deflection caused by uneven force due to the swing of the blade angle, high metering accuracy, and avoiding wear of the assembly shaft, with a long service life.

[0078] Specifically, the upper end face of the limiting ring 82 (towards the end of the third bevel gear) is provided with a circular groove to form a receiving groove 820. The receiving groove 820 is used to accommodate the first torsion spring 81. A first clamping hole 821 is provided in the receiving groove 820 to accommodate the head of the first torsion spring 81. At the same time, a second clamping hole is provided on the end face of the third bevel gear 23 to accommodate the tail of the first torsion spring 81, thereby achieving the installation of the first torsion spring 81. After assembly, the second clamping hole is located in the receiving groove, which does not affect the contact between the upper end face of the limiting ring 82 and the end face of the third bevel gear, that is, it does not affect the axial limitation of the limiting ring 82 on the third bevel gear. Through this design, not only the precise fit between the components is ensured,

[0079] In order to improve the rotation accuracy and limiting accuracy, in this application, an annular protrusion is provided on the lower end face of the third bevel gear 23 to form a sleeve 231. The sleeve 231 cooperates with the outer wall of the inner cylinder 5 to achieve a rotational connection. At the same time, the lower end of the sleeve 231 contacts the limiting ring 82 to achieve axial limiting.

[0080] In order to facilitate processing and assembly, in this application, the limiting ring 82 is connected to the outside of the inner cylinder 5 by a thread. At the same time, a first retaining spring 84 is provided on the side wall of the inner cylinder 5. The first retaining spring 84 is used to axially limit the limiting ring 82 to prevent it from loosening during rotation and affecting the axial limitation of the third bevel gear 23, thereby ensuring the close fit between the limiting ring 82 and the third bevel gear 23 and improving the stability and reliability of the overall structure.

[0081] In order to reduce the difficulty of the production process and the manufacturing cost, and at the same time, facilitate the overall assembly, in the present application, the impeller shell includes a shell 11, an upper cover and a lower cover 33, wherein the shell 11 is cylindrical with open ends (openings), and the upper cover and the lower cover 33 are respectively installed at the two ends of the shell 11 by bolts, so that a sealed chamber is formed inside thereof for installing the inner cylinder and the adjustment component, and a first card groove is provided on the inner (lower) end surface of the upper cover, and the first card groove is circular and just accommodates the pressure block 41 to be embedded, so as to limit the pressure block, and the upper cover and the pressure block 41 are connected by bolts or pins, preferably by bolts; a second card groove 333 is provided on the inner (upper) end surface of the lower cover, The second slot 333 is circular or annular, which just accommodates the end of the inner cylinder 5 to be embedded, thereby limiting the inner cylinder. The lower cover and the inner cylinder 5 are connected by a pin 59. A pin hole 3330 is provided in the second slot 333. The pin hole 3330 is a blind hole that can accommodate the pin 59 to be inserted. At the same time, a pin hole is also provided at the end of the inner cylinder 5. Through the insertion of the pin 59, the inner cylinder 5 and the lower cover 33 are fixedly connected, ensuring the stability of the inner cylinder during rotation, and further optimizing the compactness and durability of the overall structure. Through the above-mentioned structural arrangement, the stability of the installation and operation of the inner cylinder can be ensured, thereby ensuring the installation accuracy of the second bevel gear 22 and the third bevel gear 23.

[0082] Blade shaft mounting holes are evenly distributed on the circumference of the side wall of the shell 11. The axis of the blade shaft mounting hole is perpendicular to and intersects with the axis of the shell 11. A sleeve 13 is embedded in the blade shaft mounting hole. The blade shaft is inserted into the sleeve 13 to achieve a rotational connection. The outer end of the sleeve 13 is bent outward 90 degrees to form an annular limiting portion 131 to ensure the axial mounting accuracy of the sleeve 13. The length of the sleeve 13 is greater than the thickness of the shell 11, which can extend the contact length between the blade shaft and the sleeve, ensuring the rotational stability and rotation accuracy of the blade shaft. At the same time, a sealing ring is provided between the blade shaft and the sleeve, which forms a certain damping while sealing, thereby improving the stability of the blade. After the blade shaft is inserted, it is fixed by a retaining spring to achieve its axial positioning.

[0083] The upper cover body includes a main upper cover 32 and a sub-upper cover 31. The edge of the main upper cover 32 is uniformly distributed with first mounting holes in the circumferential direction, which are used to connect with the screw holes at the upper end of the shell 11. At the same time, a third card slot 320 is provided on the upper surface of the main upper cover 32. The third card slot 320 is circular and just allows the sub-upper cover 31 to be embedded for rapid positioning. A second mounting hole 321 and a first screw hole 322 are provided in the third card slot 320. The second mounting hole 321 is used to connect with the pressure block 41 through a bolt. The second mounting hole 321 is a countersunk hole that can reduce the installation thickness. The first screw hole is used to connect with the sub-upper cover 31. At the same time, a screw hole 322 is provided on the sub-upper cover 31 to align with the first screw hole 322. Corresponding to the third mounting hole 3110, a convex shaft is provided at the center of the upper end of the auxiliary upper cover 31 to form a first impeller shaft 312, and a gear is provided on the side wall of the end of the first impeller shaft 312 for connecting to the gear box to transmit power to the gear box and measure it; in order to improve the air tightness and service life, in this application, the first screw hole 322 is a blind hole, which is located on the outside of the second mounting hole 321. At the same time, a sealing ring is provided between the third slot 320 and the auxiliary upper cover 31, and the sealing ring is located between the first screw hole 322 and the second mounting hole 321. It can prevent water from flowing through the second mounting hole into the mounting cavity, thereby improving the overall air tightness of the mounting cavity and ensuring long-term stable operation of the impeller assembly.

[0084] In the present application, there can be a distance between the lower end of the motor 6 and the end face (lower cover) of the mounting cavity 110, and a battery cavity can be formed. A battery is installed in the battery cavity, and the battery is electrically connected to the motor 6 for power supply. The battery is cylindrical to maintain the center of gravity position; of course, other external power supply methods can also be used, such as power supply through brushes.

[0085] The deflection angle of the blades can be adjusted by setting an encoder disk on the motor, or setting a detection device in the gear box of the water meter, for example, to detect the rotation direction and angle of the impeller shaft, and then judge the state of the impeller and water flow.

[0086] In the present application, an angle detection device is provided in the impeller assembly, which is used to detect the rotation angle of the second bevel gear 22 or the third bevel gear 23, and then calculate the inclination angle of the blade 12. The angle detection device is an encoder, which can be a photoelectric encoder or a magnetic encoder; it is installed at the end of the second bevel gear 22 or the end of the third bevel gear 23, or directly integrated into the motor 6 to form a whole with the motor 6, that is, the motor 6 has an angle detection function.

[0087] When installed outside the motor, the angle detection device is arranged between the upper surface of the mounting platform 51 and the end of the second bevel gear 22. Wire holes are opened at the upper and lower ends of the mounting platform 51 for passing wires.

[0088] At the same time, a speed detection device is also provided for detecting the rotation speed of the impeller assembly. The detection device can be arranged at the end of the impeller housing or on the impeller shaft. The speed detection device can be a Hall sensor (magnetoelectric type), which includes a magnet and a sensor, wherein the magnet is installed on the water meter housing and the sensor is installed on the impeller assembly; or it can be an encoder.

[0089] The rotation speed of the impeller assembly is detected by a speed detection device. When the speed is too fast, the motor 6 is activated to drive the second bevel gear 22 to rotate, thereby driving the first bevel gear to rotate, and finally driving the blades to rotate, reducing their deflection angle, reducing water resistance, and reducing the impact force of water on the blades, especially the axial thrust, thereby improving the measurement accuracy. At the same time, the wear of the impeller shaft and sleeve is reduced, and the service life is extended.

[0090] When the speed is too slow, the motor 6 moves in the reverse direction, eventually driving the blades to rotate in the reverse direction, increasing the blade deflection angle and the water resistance, thereby ensuring the stability of the measurement and the detection accuracy.

[0091] When reverse metering is required, the motor 6 is activated and the blade tilt direction is reversed, so that the reverse water flow impacts the impeller at the force angle, thereby achieving reverse metering of the impeller.

[0092] The corresponding relationship between the inclination angle of the blade and the impeller speed is preset in the controller, which can be a corresponding comparison table or a formula; when the impeller speed is detected to be n1, the blade angle α1 corresponding to the speed n1 is obtained through the comparison table or calculation, and the blade is adjusted to the angle α1, thereby changing the projected area of the blade in the direction of water flow, even if the axial thrust of water on the blade changes, thereby achieving the adjustment of the impeller speed.

[0093] The following examples illustrate the relationship between the rotational speed and the tilt angle in this application:

[0094] 1. Use a general formula;

[0095]

[0096] Wherein, N is the detected speed. When its sign is positive, it indicates the water flow is in the forward direction, and when its sign is negative, it indicates the water flow is in the reverse direction. The positive and negative signs are used to control the tilt direction of the blade, and its direction is detected by the speed sensor; N max is the maximum design speed, such as 3000r / min, 5000r / min, etc.; α is the attenuation coefficient, the data is 1-1.2; k is the nonlinear index, the data is 1.1-1.5; the parameters can be modified according to different working conditions.

[0097] 2. Use the segmented refinement formula:

[0098]

[0099] Where N is the detected speed, N1 is the preset speed for the high and low speed dividing point. For example, when it is lower than this speed, it is low speed and the first equation is used; when it is higher than this speed, it is high speed and the second equation is used; N2 is the maximum design speed; it adopts segmented adjustment, which can improve the adjustment smoothness and efficiency, and avoid impact during high-speed adjustment.

[0100] 3. Preset speed-angle comparison table;

[0101]

[0102]

[0103] The above n is the detected impeller speed, which can be a specific speed or a speed range. For example, a difference of 10r / min is used as an adjustment range, n1 is 0-10r / min, n2 is 10-20r / min, etc. Different control data can be set according to different working conditions.

[0104] When adjusting the angle of the blades, different types of control methods can be selected to adjust the tilt angle of the blades according to different usage scenarios and working conditions.

[0105] The inclination angle and direction of the blades are detected by an angle detection device.

[0106] The rotation speed and direction of the impeller are detected by a rotation speed detection device.

[0107] In the present application, the density of the impeller assembly is 0.9-1.1 times the density of water at room temperature, and its center of gravity is located on the axis of the impeller assembly.

[0108] The variable pitch impeller assembly of the water meter of the present invention adopts a rotating blade structure, which can realize the adjustment of the deflection angle and deflection direction of the blade. When the speed is too high, the blade inclination angle is reduced, the water resistance is reduced, the measurement accuracy is improved, the wear is reduced, and the service life is extended; when the speed is low, the blade inclination angle is increased, the water resistance is increased, the measurement stability is ensured, and the measurement range is increased; when the water flow direction changes and reverse water flow measurement is required, the blade is driven to deflect in the reverse direction, so that the reverse water flow impacts the impeller at a force angle, so that the impeller rotates normally, thereby realizing accurate reverse measurement, can adapt to different water flow environments, improve measurement accuracy, and has a wide range of applications; the split structure is adopted to reduce the difficulty of the production process and the manufacturing cost, and is easy to assemble, and is beneficial to improving the overall performance and reliability of the water meter; the pressure block structure is provided to ensure the installation stability of the inner cylinder and the bevel gear, and ensure the reliability of the impeller assembly; a sliding shaft is provided The bearing can improve the rotation stability of the bevel gear and avoid jamming, and the installation space is small, which is beneficial to the overall gear control; a third bevel gear and a torsion spring are provided, so that the third bevel gear has a movement tendency to drive the blade to reset to a vertical state, and the third bevel gear always has a tendency to push the first bevel gear to rotate, thereby enabling the gear teeth of the first bevel gear to always contact the gear teeth of the second bevel gear, eliminating the gap between the teeth, and avoiding the blades from swinging slightly at a small angle, thereby greatly improving the stability of the blades in the locked state, improving their rotation stability, avoiding the overall deflection caused by uneven force due to the swing of the blade angle, high metering accuracy, and can avoid wear of the assembly shaft, and long service life; the water meter variable pitch impeller assembly of the present invention adopts rotating blades, can accurately control the deflection angle and direction of the blades, can adapt to different water flow environments, has a wide range of applications, a long service life, and can achieve two-way precise metering.

[0109] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A water meter variable pitch impeller assembly, characterized in that: include: An impeller shell, with impeller shafts at both ends, a sealed cavity formed inside the impeller shell and forming a mounting cavity 110; There are multiple blades 12 that are evenly distributed around the circumference. The blades 12 are rotatably mounted on the side wall of the impeller shell via blade shafts 121, and their rotation axes are perpendicular to and intersect the axis of the impeller shell. A first bevel gear 21 is mounted on the end of the blade shaft 121; The inner cylinder 5 is fixed in the mounting cavity 110 and is coaxial with the impeller shell; A second bevel gear 22 is coaxially and rotatably mounted on the upper end of the inner cylinder 5 and meshes with each of the first bevel gears 21; The motor 6 is coaxially fixed in the inner cylinder 5 , and its output end is connected to the second bevel gear 22 and is used to drive the second bevel gear 22 to rotate, thereby being able to adjust the deflection direction and deflection angle of the blade 12 .

2. The water meter variable pitch impeller assembly according to claim 1, characterized in that: A pressing block 41 is provided at the end of the second bevel gear 22 . The end of the pressing block 41 is fixedly connected to the end surface of the mounting cavity 110 . Sliding bearings are provided between the contact surfaces of the second bevel gear 22 , the pressing block 41 and the inner cylinder 5 .

3. The water meter variable pitch impeller assembly according to claim 1, characterized in that: The inner wall of the inner cylinder 5 is provided with an annular protrusion and forms a mounting platform 51. The two end faces of the second bevel gear 22 are penetrated by arc-shaped limiting grooves 2210. There are at least two limiting grooves 2210 and they are evenly distributed circumferentially. The pin shaft or bolt 7 passes through the mounting platform 51 and the limiting grooves 2210 from bottom to top in sequence and is fixedly connected to the pressure block 41, and can realize axial and rotational limitation of the second bevel gear 22.

4. The water meter variable pitch impeller assembly according to claim 3, characterized in that: The mounting platform 51 separates the inner cylinder 5 into an upper area and a lower area, and the end face of the motor 6 is fitted on the lower end face of the mounting platform 51 and fixed by bolts; the end of the second bevel gear 22 is provided with a cylindrical protrusion and forms a gear shaft 221, and the gear shaft 221 is rotatably mounted in the upper area.

5. The water meter variable pitch impeller assembly according to claim 1, characterized in that: There is rotation damping between the second bevel gear 22 and the inner cylinder 5 .

6. The water meter variable pitch impeller assembly according to claim 1, characterized in that: The motor 6 is a planetary reduction motor with a brake.

7. The water meter variable pitch impeller assembly according to claim 1, characterized in that: The rotation angle of the blade 12 is ±45 degrees.

8. The water meter variable pitch impeller assembly according to claim 1, characterized in that: A third bevel gear 23 is rotatably mounted on the outside of the inner cylinder 5, which is coaxial with the second bevel gear 22 and meshed with each of the first bevel gears 21. The first bevel gear 21 is located between the second bevel gear 22 and the third bevel gear 23. A limiting ring 82 is provided at the end of the third bevel gear 23 for axially limiting the third bevel gear 23. A first torsion spring 81 is provided between the limiting ring 82 and the third bevel gear 23. The first torsion spring 81 enables the third bevel gear 23 to drive the blade 12 to have a movement tendency to return to a vertical state.

9. The water meter variable pitch impeller assembly according to claim 1, characterized in that: The limiting ring 82 is connected to the outside of the inner cylinder 5 by threads, and the side wall of the inner cylinder 5 is provided with a first clamping spring 84 for axially limiting the limiting ring 82.

10. The water meter variable pitch impeller assembly according to claim 1, characterized in that: The end surface of the limiting ring 82 is provided with a receiving groove 820 for accommodating the first torsion spring 81, and the receiving groove 820 is provided with a first clamping hole 821 for inserting the head of the first torsion spring 81. The end surface of the third bevel gear 23 is provided with a second clamping hole for inserting the tail of the first torsion spring 81.

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