Magnetoelectric flowmeter utilizing magnetic suspension to avoid friction

Abstract

The utility model relates to the technical field of flow meters, in particular to a magnetoelectric flow meter utilizing magnetic suspension to avoid friction, which comprises a shell and an impeller rotatably arranged in the shell, the impeller is provided with a first magnetic part, and the shell is provided with a second magnetic part. The inner bottom wall of the shell does not make contact with the impeller through the magnetic force of the first magnetic piece and the second magnetic piece. According to the utility model, through the interaction of the first magnetic piece and the second magnetic piece, the gravity of the impeller is counteracted by magnetic force, and the effect of suspending the impeller in the shell is realized, so that the situation that the impeller cannot rotate in a low-flow state due to the friction force between the impeller and the inner bottom wall of the shell is avoided, and the sensitivity of the low-flow impeller is improved.

Description

Technical Field

[0001] This utility model relates to the field of flow meter technology, and in particular to a magnetoelectric flow meter that uses magnetic levitation to avoid friction. Background Technology

[0002] Flow measurement is a technology with increasing demand, playing a crucial role in liquid measurement, typically achieved through flow meters. The impeller is one of the core components of a flow meter, and the resistance it experiences significantly impacts the flow meter's sensitivity. For example, Chinese utility model patent CN202421464840.9 discloses a novel impeller and magnetoelectric flow meter. By optimizing the impeller's drain holes and blades, it improves water flowability and reduces resistance, thereby enhancing sensitivity.

[0003] However, the above-mentioned existing technology still has the following shortcomings: the impeller is mounted on the shaft of the housing, so that the impeller will contact the inner bottom wall of the housing in a natural state. The friction between the impeller and the inner bottom wall of the housing will obviously block the impeller from rotating, so that the impeller cannot rotate when the water flow is low, thus the flow meter cannot measure the water flow under low flow conditions. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a magnetoelectric flow meter that uses magnetic levitation to avoid friction, which can prevent the impeller from contacting the inner bottom wall of the casing, thereby further reducing the friction force on the impeller and realizing measurement at low flow rates.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a magnetoelectric flow meter that uses magnetic levitation to avoid friction, including a housing and an impeller rotatably disposed inside the housing. The impeller is provided with a first magnetic element, and the housing is provided with a second magnetic element. The magnetic force of the first magnetic element and the second magnetic element is used to prevent the inner bottom wall of the housing from contacting the impeller.

[0007] Furthermore, the first magnetic component is installed inside the impeller, and the second magnetic component is located at the bottom of the outer casing. The polarities of the first and second magnetic components are the same at their opposite ends.

[0008] Furthermore, the impeller is provided with a mounting groove at one end near the bottom wall of the outer casing, and the first magnetic component is disposed in the mounting groove.

[0009] Furthermore, the first magnetic element is located at one end of the impeller near the bottom wall of the inner casing.

[0010] Furthermore, a rotating shaft is provided inside the outer casing, and the impeller is rotatably mounted on the rotating shaft; a fixed shaft is provided at the bottom of the outer casing, and the fixed shaft and the rotating shaft are arranged along the same central axis, and the second magnetic component is mounted on the fixed shaft.

[0011] Furthermore, the outer casing is provided with an assembly groove, and the fixed shaft is disposed in the assembly groove and concentrically disposed with the assembly groove. The assembly groove is used to accommodate the second magnetic component.

[0012] Furthermore, the impeller includes a main body and multiple blades. The blades are arranged in a circular array around the center of the main body on the side of the main body. One end of the main body is provided with a mounting base, which has two drainage holes. The drainage holes pass through the mounting base and connect one end of the main body to the other end. The blades have an arc-shaped structure.

[0013] Furthermore, the arc center angle of the blade is 5-15°.

[0014] Furthermore, the first magnetic component is disposed on the top of the impeller, and the second magnetic component is disposed inside the housing, with the polarities of the opposite ends of the first magnetic component and the second magnetic component being the same.

[0015] The beneficial effects of this utility model are as follows: By interacting with the first magnetic component and the second magnetic component, the magnetic force cancels out the gravity of the impeller, thus achieving the effect of suspending the impeller inside the outer casing. This avoids the impeller being unable to rotate at low flow rates due to friction between the impeller and the bottom wall of the outer casing, thereby improving the sensitivity of this utility model. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of Example 1.

[0017] Figure 2 This is an exploded view of Example 1.

[0018] Figure 3 for Figure 2 Enlarged view of point A.

[0019] Figure 4 This is a schematic diagram of the impeller in Example 1.

[0020] Figure 5 This is a schematic diagram of the outer casing of Example 1.

[0021] Reference numerals: 1—outer shell, 2—impeller, 3—first magnetic component, 4—second magnetic component, 10

[0022] 11—Spinning shaft, 12—Fixed shaft, 13—Assembly slot, 14—Water inlet pipe, 15—Water outlet pipe, 20—Induction module, 21—Mounting slot, 22—Main body, 23—Blade, 24—Mounting base, 25—Drain hole, 26—Center hole, 27—Magnet, 210—Positioning slot, 211—Hollow hole. Detailed Implementation

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figures 1 to 5 As shown, this embodiment provides a magnetoelectric flow meter that uses magnetic levitation to avoid friction, including a housing 1 and an impeller 2 rotatably disposed inside the housing 1. The impeller 2 is provided with a first magnetic element 3, and the housing 1 is provided with a second magnetic element 4. The magnetic force of the first magnetic element 3 and the second magnetic element 4 is used to prevent the inner bottom wall of the housing 1 from contacting the impeller 2.

[0026] In practical applications, both the first magnetic component 3 and the second magnetic component 4 are permanent magnets, which can be made of neodymium iron boron or other materials. Since permanent magnets exhibit the effect of like poles repelling and unlike poles attracting, and the magnetic force increases with closer proximity to the permanent magnet, the magnetic field effect between the first magnetic component 3 and the second magnetic component 4 allows the impeller 2 to be suspended within the housing 1 at a specified height. The force between the first magnetic component 3 and the second magnetic component 4 can counteract the total weight of the impeller 2 and the first magnetic component 3, thus allowing the impeller 2 to float within the housing 1 without contacting the inner bottom wall of the housing 1. If a small flow of fluid enters the device at this time, since the frictional force on the impeller 2 does not include the frictional force between it and the inner bottom wall of the housing 1, the impeller 2 can be driven to rotate by the small flow of fluid, thereby achieving the measurement effect.

[0027] In this embodiment, the first magnetic element 3 is installed inside the impeller 2, and the second magnetic element 4 is disposed at the bottom of the outer casing 1. The polarities of the first magnetic element 3 and the second magnetic element 4 are the same at their opposite ends.

[0028] The impeller 2 described in this embodiment can be the impeller 2 disclosed in Chinese Utility Model Patent No. CN202421464840.9. When the distance between the impeller 2 and the outer shell 1 reaches a certain value, the repulsive force between the first magnetic component 3 and the second magnetic component 4 is exactly equal to the total weight of the impeller 2 and the first magnetic component 3, thereby keeping the impeller 2 in a suspended state.

[0029] Specifically, the impeller 2 is provided with a mounting groove 20 at one end near the bottom wall of the inner wall of the outer shell 1, and the first magnetic component 3 is disposed in the mounting groove 20, so that the center of the annular first magnetic component 3 coincides with the center of the rotation axis of the impeller 2, ensuring that the magnetic field of the first magnetic component 3 in the direction of the rotation axis of the impeller 2 remains basically unchanged during rotation, thereby ensuring the stability of the position of the impeller 2.

[0030] Specifically, the first magnetic element 3 is located at one end of the impeller 2 near the bottom wall of the outer casing 1.

[0031] In actual use, a rotating shaft 10 is provided inside the outer casing 1, and the impeller 2 is rotatably mounted on the rotating shaft 10; a fixed shaft 11 is provided on the bottom outside the outer casing 1, and the fixed shaft 11 and the rotating shaft 10 are arranged along the same central axis, and the second magnetic component 4 is mounted on the fixed shaft 11. The second magnetic component 4 is outside the outer casing 1, which helps to ensure the stability of the position of the second magnetic component 4 and avoids the second magnetic component 4 being affected by fluid impact.

[0032] Specifically, the outer casing 1 is provided with an assembly groove 12, and the fixed shaft 11 is disposed in the assembly groove 12 and concentrically disposed with the assembly groove 12. The assembly groove 12 is used to accommodate the second magnetic component 4, so that the second magnetic component 4 and the first magnetic component 3 share the same central axis, so that when the impeller 2 rotates relative to the outer casing 1, the magnetic field strength of the first magnetic component 3 on the central axis remains basically unchanged relative to the first magnetic component 3, thereby ensuring the stability of the impeller 2.

[0033] In this embodiment, the impeller 2 includes a main body 21 and a plurality of blades 22. The blades 22 are arranged in a circular array around the center of the main body 21 on the side of the main body 21. One end of the main body 21 is provided with a mounting base 23. The mounting base 23 is provided with two drainage holes 24. The drainage holes 24 pass through the mounting base 23 and connect one end of the main body 21 and the other end. The blades 22 have an arc-shaped structure.

[0034] The outer casing 1 is connected to an inlet pipe 13 and an outlet pipe 14, and the outer casing 1 is equipped with a sensing module 15 for sensing the rotation of the impeller 2. When in operation, water enters the outer casing 1 through the inlet pipe 13, and the flow of water drives the new impeller 2 to rotate. Since the blades 22 are arc-shaped, the contact area between the blades 22 and the water is larger, making it easier for the water to move the blades 22 to drive the new impeller 2 to rotate. In addition, since the new impeller 2 has a drain hole 24, water can not only overflow upwards from the gap between adjacent blades 22 and move to the outlet pipe 14, but also move upwards from the drain hole 24, making the water flow path more diverse and flexible. This reliably reduces the resistance caused by internal undercurrents due to water obstruction, allowing the force of the water to act better on the impeller 2, thereby making the water flow measurement more sensitive.

[0035] In this embodiment, the mounting base 23 has a central hole 25, and two drainage holes 24 are symmetrically arranged about the central axis of the central hole 25, and the drainage holes 24 are connected to the central hole 25.

[0036] The mounting base 23 is symmetrically arranged with two magnetic holes 26 about the central axis of the central hole 25, and a magnet 27 is installed in the magnetic hole 26.

[0037] The central hole 25 is used to accommodate the rotating shaft 10 set in the outer shell 1, and the distribution of the two drain holes 24 achieves the effect of making the water flow path more uniform; the magnetic hole 26 is used to accommodate the magnet 27. When the new impeller 2 is driven by water to rotate, the sensing module 15 senses the change of the magnetic field around the new impeller 2 to obtain the number of rotations of the impeller 2, and calculates the water flow rate based on the number of rotations.

[0038] Specifically, the inner wall of the magnetic hole 26 has multiple positioning protrusions, and the top of the positioning protrusions is provided with a guiding slope, so that the magnet 27 is guided by the guiding slope and installed into the magnetic hole and positioned by the contact of each positioning protrusion, thus ensuring the reliability of the installation.

[0039] Specifically, positioning grooves 210 are connected to both sides of the central hole 25, and the rotating shaft 10 has a corresponding positioning part. That is, in addition to being used in flow meters, the new impeller 2 can also be used in water pumps. In this case, the positioning groove 210 is used to cooperate with the shaft of the motor to achieve the effect of synchronous rotation of the new impeller 2 and the shaft of the motor.

[0040] In this embodiment, the mounting base 23 is provided with hollow holes 211 on both sides, which are also used to allow water to flow from more angles and reduce the force of water on the mounting base 23.

[0041] In this embodiment, the arc center angle of the blade 22 is 5-15°.

[0042] In this embodiment, since the magnetic fields of the annular first magnetic element 3 and the annular second magnetic element 4 remain basically unchanged in the axial direction of the impeller 2 when the impeller 2 rotates, it will not affect the position change of the sensing magnet 27 sensed by the sensing module 15.

[0043] Example 2

[0044] The difference between this embodiment and embodiment 1 is that the first magnetic component 3 is disposed on the top of the impeller 2, the second magnetic component 4 is disposed inside the outer casing 1, and the polarities of the first magnetic component 3 and the second magnetic component 4 are the same at their opposite ends.

[0045] Specifically, the second magnetic component 4 is a ring structure, which is sleeved on the rotating shaft 10 of the outer shell 1 and fixed to the inner bottom wall of the outer shell 1. In order to ensure that the second magnetic component 4 and the first magnetic component 3 have sufficient distance, the first magnetic component 3 is set on the top of the impeller 2 in this state. At the same time, the first magnetic component 3 and the magnet 27 have a corresponding shielding structure to avoid mutual interference.

[0046] Although the implementation of this embodiment is more difficult than that of Embodiment 1, the technical effects described in Embodiment 1 can still be achieved.

[0047] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A magnetoelectric flowmeter that utilizes magnetic levitation to avoid friction, comprising a housing and an impeller rotatably disposed within the housing, characterized in that: The impeller is provided with a first magnetic component, and the outer casing is provided with a second magnetic component. The magnetic force of the first and second magnetic components is used to prevent the inner bottom wall of the outer casing from contacting the impeller.

2. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 1, characterized in that: The first magnetic component is installed inside the impeller, and the second magnetic component is located at the bottom of the outer casing. The polarities of the first and second magnetic components are the same at their opposite ends.

3. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 2, characterized in that: The impeller is provided with a mounting groove at one end near the bottom wall of the outer casing, and the first magnetic component is disposed in the mounting groove.

4. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 2, characterized in that: The first magnetic component is located at one end of the impeller near the bottom wall of the inner casing.

5. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 2, characterized in that: The housing contains a rotating shaft, on which the impeller rotates; a fixed shaft is located at the bottom of the housing, sharing a central axis with the rotating shaft, and a second magnetic component is mounted on the fixed shaft.

6. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 5, characterized in that: The outer casing is provided with an assembly groove, and the fixed shaft is disposed in the assembly groove and is concentric with the assembly groove. The assembly groove is used to accommodate the second magnetic component.

7. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 1, characterized in that: The impeller includes a main body and multiple blades. The blades are arranged in a circular array around the center of the main body on the side of the main body. One end of the main body is provided with a mounting base, which has two drainage holes. The drainage holes pass through the mounting base and connect one end of the main body to the other end. The blades have an arc-shaped structure.

8. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 7, characterized in that: The arc center angle of the blade is 5-15°.

9. The magnetoelectric flowmeter using magnetic levitation to avoid friction according to claim 1, characterized in that: The first magnetic component is disposed on the top of the impeller, and the second magnetic component is disposed inside the housing. The polarities of the first magnetic component and the second magnetic component are the same at their opposite ends.

Images