A water meter movement

Abstract

The present invention discloses a water meter movement, comprising: an impeller box, the impeller box has a storage space inside; an impeller shaft, an impeller is mounted on the impeller shaft, the impeller is movably arranged in the storage space so that the impeller shaft can rotate relative to the impeller box, and an annular coil is arranged on the impeller shaft; a permanent magnet is arranged in the storage space, the permanent magnet is positioned relative to the impeller box and corresponds to the annular coil. The present invention can realize the correction of the flow error of the water meter.

Description

Technical Field

[0001] The invention relates to the technical field of water meters, and in particular to a water meter movement. Background Art

[0002] The water meter movement is the core component that affects the metering accuracy of the water meter. When water enters the impeller box through the pipe and the water meter case, it will impact the impeller and form a driving torque on the impeller. When the driving torque of the impeller is greater than the friction resistance torque of the impeller, the impeller begins to accelerate, and finally the driving torque and friction resistance torque of the impeller reach a balance, and the impeller rotates at a constant speed at this time. For multi-stream meters, especially those with high precision, at low flow rates, due to the effect of the impeller's own gravity, the friction force generated by the impeller shaft largely offsets the driving force generated by the water flow impacting the impeller, resulting in a slow speed of the water meter impeller, which makes the water meter negative at small flow rates. As the flow rate increases, the water meter impeller gradually floats up, causing the water meter impeller to rotate faster, which makes the water meter positive at large flow rates. The negative situation at small flow rates and the positive situation at large flow rates are difficult problems that affect the accuracy of the metering curve of multi-stream water meters. Summary of the invention

[0003] The invention provides a water meter movement, which can realize the correction of the water meter flow error.

[0004] In order to solve the above technical problems, the present invention provides a water meter movement, comprising:

[0005] An impeller box, wherein the impeller box has a receiving space therein;

[0006] An impeller shaft, on which an impeller is mounted, the impeller being movably arranged in the accommodation space so that the impeller shaft can rotate relative to the impeller box, and an annular coil being arranged on the impeller shaft;

[0007] A permanent magnet is disposed in the accommodating space, and the permanent magnet is positioned relative to the impeller box and corresponds to the annular coil.

[0008] As a preferred embodiment of the above technical solution, the number and position of the permanent magnets and the annular coils correspond to each other, the number of the permanent magnets is an even number, and the permanent magnets are distributed in an annular array.

[0009] As a preferred embodiment of the above technical solution, the permanent magnets are alternately distributed according to their magnetic pole directions so that the magnetic pole directions of every two adjacent permanent magnets are opposite.

[0010] As a preferred embodiment of the above technical solution, the lower end of the impeller shaft is close to the bottom of the accommodating space, the permanent magnet is arranged at the bottom of the accommodating space, and the annular coil is embedded in the lower end surface of the impeller shaft.

[0011] As a preferred embodiment of the above technical solution, a top point is provided at the bottom of the accommodating space, a bushing is provided at the lower end of the impeller shaft, and the bushing is sleeved on the top point so that the impeller shaft can rotate relative to the top point.

[0012] As a preferred embodiment of the above technical solution, corundum is provided on the bushing, and the corundum is used to contact the top.

[0013] As a preferred embodiment of the above technical solution, the annular coils are distributed in an annular array around the central axis of the impeller shaft, and the permanent magnets are distributed in an annular array around the central axis of the tip.

[0014] As a preferred embodiment of the above technical solution, the diameter of the annular coil is the same as that of the permanent magnet.

[0015] As a preferred embodiment of the above technical solution, a spoiler rib is provided at the bottom of the accommodating space, the spoiler rib protrudes from the bottom of the accommodating space, and the permanent magnet is arranged on the top of the spoiler rib.

[0016] As a preferred embodiment of the above technical solution, the annular coil is a concentric annular coil or a spiral annular coil.

[0017] The present invention provides a water meter movement, which comprises an impeller box, an impeller shaft and a permanent magnet. The impeller box has an accommodation space inside, an impeller is installed on the impeller shaft, the impeller shaft is rotatably installed in the accommodation space, an annular coil is arranged on the impeller shaft, the annular coil rotates with the impeller shaft when the impeller shaft rotates, and the permanent magnet is arranged in the accommodation space. The annular coil can rotate relative to the permanent magnet during the rotation of the impeller shaft. When a large flow of water passes through the water meter, the impeller floats, and the impeller floats, which reduces the friction force on the impeller shaft, thereby causing the rotation speed to be too fast, and the measurement result is larger than the actual flow rate. In the present invention, the annular coil and the permanent magnet are based on Lenz's law, that is, the magnetic field of the induced current generated by the annular coil always hinders the change of the magnetic flux causing the induced current. Based on the Lenz principle, the rotating shaft is subjected to Lenz force to reduce its rotation speed. As the impeller rotation speed increases, the Lenz torque on the impeller gradually increases, thereby achieving the purpose of correcting the flow error of the water meter.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view of a water meter movement according to an embodiment of the present invention is shown;

[0020] Figure 2 Shows Figure 1 AA section view in the figure;

[0021] Figure 3 Shows Figure 1 BB section view in the figure;

[0022] Figure 4 A schematic diagram of the structure of a toroidal coil in a first embodiment of the present invention is shown;

[0023] Figure 5 A schematic diagram of the structure of a toroidal coil in a second embodiment of the present invention is shown;

[0024] In the figure: 1. movement body; 2. impeller box; 3. impeller; 4. annular coil; 5. permanent magnet; 21. top; 22. spoiler ribs; 31. impeller shaft; 32. bushing; 33. corundum. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 5 , an embodiment of the present invention provides a water meter movement, including:

[0027] An impeller box 2, wherein the impeller box 2 has a receiving space therein;

[0028] An impeller shaft 31, on which an impeller 3 is mounted, the impeller 3 is movably arranged in the accommodation space so that the impeller shaft 31 can rotate relative to the impeller box 2, and an annular coil 4 is arranged on the impeller shaft 31;

[0029] The permanent magnet 5 is disposed in the accommodating space. The permanent magnet 5 is positioned relative to the impeller box 2 and corresponds to the annular coil 4 .

[0030] The present embodiment provides a water meter movement, which includes a movement body 1, the movement body 1 has an impeller box 2, an impeller shaft 31 and a permanent magnet 5, the impeller box 2 has an accommodating space inside, an impeller 3 is installed on the impeller shaft 31, the impeller shaft 31 is rotatably installed in the accommodating space, an annular coil 4 is arranged on the impeller shaft 31, when the impeller shaft 31 rotates, the annular coil 4 rotates with the impeller shaft 31, and the permanent magnet 5 is arranged in the accommodating space, the impeller shaft 31 rotates during the rotation of the annular coil 4 can rotate relative to the permanent magnet 5, in the water meter When the water flow is large, the impeller floats up, and the impeller floats up, which reduces the friction force on the impeller shaft, thus causing the rotation speed to be too fast, and the measurement result is larger than the actual flow rate. In the present invention, the annular coil 4 and the permanent magnet 5 are based on Lenz's law, that is, the magnetic field of the induced current generated by the annular coil always hinders the change of the magnetic flux causing the induced current. Based on the Lenz principle, the rotating shaft is subjected to the Lenz force to reduce its rotation speed. As the rotation speed of the impeller 3 increases, the Lenz torque on the impeller 3 gradually increases, thereby achieving the purpose of correcting the water meter flow error.

[0031] Specifically, the permanent magnet 5 in this embodiment is magnetic steel. Of course, the installation position between the permanent magnet 5 and the annular coil 4 in this embodiment can be adjusted and exchanged, as long as the permanent magnet 5 and the annular coil 4 can rotate relative to each other.

[0032] In a further feasible embodiment of the present invention, the number and position of the permanent magnets 5 and the annular coils 4 correspond to each other, the number of the permanent magnets 5 is an even number, and the permanent magnets 5 are distributed in an annular array.

[0033] The permanent magnets 5 in this embodiment are distributed in a circular array, and the annular coils 4 are arranged correspondingly to the permanent magnets 5, which can make the entire working process more stable. Specifically, the permanent magnets 5 and the annular coils 4 are evenly distributed, so the entire deceleration working process can be more stable.

[0034] In a further possible implementation of this embodiment, the permanent magnets 5 are alternately distributed according to their magnetic pole directions so that the magnetic pole directions of every two adjacent permanent magnets 5 are opposite.

[0035] The permanent magnets 5 in this embodiment are alternately distributed according to the direction of their magnetic poles, which can increase the change of the magnetic field in the coil, which can improve the response speed and further achieve rapid correction.

[0036] In a further implementable embodiment of the present invention, the lower end of the impeller shaft 31 is close to the bottom of the accommodation space, the permanent magnet 5 is arranged at the bottom of the accommodation space, and the annular coil 4 is embedded in the lower end surface of the impeller shaft 31 .

[0037] In this embodiment, the permanent magnet 5 is arranged at the bottom of the accommodating space, and the annular coil 4 is embedded in the lower end surface of the impeller shaft 31, which makes the permanent magnet 5 and the annular coil 4 close to each other and opposite to each other, which can improve the working stability and prevent the work between the permanent magnet 5 and the annular coil 4 from being affected due to the floating of the impeller 3.

[0038] In a further embodiment of the present invention, a tip 21 is disposed at the bottom of the accommodating space, a bushing 32 is disposed at the lower end of the impeller shaft 31 , and the bushing 32 is sleeved on the tip 21 so that the impeller shaft 31 can rotate relative to the tip 21 .

[0039] In the present embodiment, the rotation of the impeller shaft 31 is achieved by the cooperation between the tip 21 and the bushing 32, which can not only reduce the friction of the impeller shaft 31 during the rotation, but also, the cooperation between the tip 21 and the bushing 32 can facilitate the arrangement of the annular coil 4 on the lower end surface of the impeller shaft 31, and further facilitate the installation and arrangement of the permanent magnet 5 and the annular coil 4.

[0040] In a further possible implementation of this embodiment, a corundum 33 is provided on the bushing 32 , and the corundum 33 is used to contact the top 21 .

[0041] The corundum 33 in this embodiment is used to contact the top 21 , which can improve the wear resistance of the bushing 32 and further extend the service life of the water meter movement 1 .

[0042] In a further feasible embodiment of the present invention, the annular coils 4 are distributed in an annular array around the central axis of the impeller shaft 31 , and the permanent magnets 5 are distributed in an annular array around the central axis of the tip 21 .

[0043] The installation positions of the annular coil 4 and the permanent magnet 5 in this embodiment are reasonable, which can improve the working stability.

[0044] In a further feasible embodiment of the present invention, the permanent magnet 5 is cylindrical, and the annular coil 4 and the permanent magnet 5 have the same diameter.

[0045] The permanent magnet 5 in this embodiment is cylindrical, and the diameter of the annular coil 4 is the same as that of the permanent magnet 5 , which can improve the working stability.

[0046] In a further implementable embodiment of the present invention, a spoiler rib 22 is disposed at the bottom of the accommodation space, the spoiler rib 22 protrudes from the bottom of the accommodation space, and the permanent magnet 5 is disposed on the top of the spoiler rib 22 .

[0047] The spoiler ribs 22 in this embodiment can prevent the generation of spoilers under large flow conditions. In addition, the permanent magnet 5 is arranged on the top of the spoiler ribs 22 in combination with the spoiler ribs 22 to further improve the working stability.

[0048] In a further possible implementation of this embodiment, the annular coil 4 is a concentric annular coil or a spiral annular coil.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A water meter movement, characterized in that: It comprises: an impeller box, wherein the impeller box has a receiving space inside; An impeller shaft, on which an impeller is mounted, the impeller being movably arranged in the accommodation space so that the impeller shaft can rotate relative to the impeller box, and an annular coil being arranged on the impeller shaft; a permanent magnet, disposed in the accommodation space, the permanent magnet being positioned relative to the impeller box and corresponding to the annular coil; As the impeller speed increases, the Lenz force acting on the impeller gradually increases to balance the reduced friction of the impeller shaft caused by the impeller floating up.

2. The water meter movement according to claim 1, characterized in that: The number and position of the permanent magnets correspond to the annular coils. The number of the permanent magnets is an even number, and the permanent magnets are distributed in an annular array.

3. The water meter movement according to claim 2, characterized in that: The permanent magnets are alternately distributed according to their magnetic pole directions so that the magnetic pole directions of every two adjacent permanent magnets are opposite.

4. The water meter movement according to claim 2, characterized in that: The lower end of the impeller shaft is close to the bottom of the accommodating space, the permanent magnet is arranged at the bottom of the accommodating space, and the annular coil is embedded in the lower end surface of the impeller shaft.

5. The water meter movement according to claim 4, characterized in that: The bottom of the accommodating space is provided with a top, the lower end of the impeller shaft is provided with a bushing, and the bushing is sleeved on the top so that the impeller shaft can rotate relative to the top.

6. The water meter movement according to claim 5, characterized in that: The bushing is provided with corundum, and the corundum is used for contacting with the top.

7. The water meter movement according to claim 5, characterized in that: The annular coils are distributed in an annular array around the central axis of the impeller shaft, and the permanent magnets are distributed in an annular array around the central axis of the top.

8. The water meter movement according to claim 2, characterized in that: The permanent magnet is cylindrical, and the annular coil has the same diameter as that of the permanent magnet.

9. The water meter movement according to claim 1, characterized in that: The bottom of the accommodation space is provided with a spoiler rib, the spoiler rib protrudes from the bottom of the accommodation space, and the permanent magnet is arranged on the top of the spoiler rib.

10. The water meter movement according to claim 1, characterized in that: The annular coil is a concentric annular coil or a spiral annular coil.

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