Pump structure with high efficiency and low noise

Abstract

The utility model relates to the technical field of liquid conveying, in particular to a high-efficiency and low-noise pump structure, which is characterized in that a wire slot on a stator is arranged to be a skewed slot, and the stator and a rotor are arranged to be eccentrically connected, so that the stator generates an inclined magnetic field, and then part of axial force generated on the rotor is counteracted; the abrasion of the impeller shaft on the rotor is reduced, the noise is reduced, the use is convenient, and the reliability is high; comprising a pump shell, a rotor assembly, a waterproof machine shell, a stator assembly, an impeller shaft and a machine shell bottom cover, the impeller shaft is fixedly installed on the rotor assembly, a bearing is arranged on the lower portion of the impeller shaft, the bearing is fixedly installed on the machine shell bottom cover, the pump shell is fixedly connected with the machine shell bottom cover, the stator assembly is fixedly installed in the machine shell bottom cover, and the machine shell bottom cover is arranged in the pump shell. A plurality of wire slots are formed in the stator assembly; a plurality of wire slots on the stator assembly are obliquely arranged on the stator assembly, and included angles are formed between the wire slots and the axis of the stator assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid transportation, in particular to a high-efficiency and low-noise pump structure. Background Art

[0002] A water pump is a machine used to transport liquids. It transports liquids by transferring mechanical energy from the motor to the liquid. The current centrifugal water pump has the following problems during the transportation process: due to the difference between the front and rear covers of the centrifugal water pump and the liquid reaction force, an axial force will be generated on the impeller shaft of the centrifugal water pump, and the direction of the axial force points to the direction of the bottom cover of the water pump; this axial force applied to the impeller shaft will cause the following hazards: increase the friction between the gasket at the bottom of the impeller shaft and the bearing, increase the wear of the bearing, increase the noise, increase the resistance of the wheel during rotation, reduce the efficiency, and affect the smooth operation of the water pump. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a high-efficiency, low-noise pump structure which is easy to use, has high reliability and is easy to use, and can generate an inclined magnetic field on the stator, thereby offsetting a part of the axial force generated on the impeller shaft of the rotor by the outside world, thereby reducing the wear of the impeller shaft on the rotor, reducing noise, and improving efficiency.

[0004] The utility model discloses a high-efficiency, low-noise pump structure, comprising a pump casing, a rotor assembly, a water-proof casing, a stator assembly, an impeller shaft and a casing bottom cover, wherein the impeller shaft is fixedly mounted on the rotor assembly, a bearing is arranged at the lower part of the impeller shaft, the bearing is fixedly mounted on the casing bottom cover, the pump casing is fixedly connected to the casing bottom cover, the stator assembly is fixedly mounted in the casing bottom cover, the casing bottom cover is arranged in the pump casing, a plurality of wire slots are arranged in the stator assembly, a coil is arranged on the stator assembly, the coil is wound in the plurality of wire slots, and a bearing is arranged at the lower end of the rotor assembly; the plurality of wire slots on the stator assembly are all obliquely arranged on the stator assembly, and an angle is formed between the wire slots and the axis of the stator assembly; in the motor in the prior art, the wire slots on the stator The stator assembly is a linear slot in which the coil is wound. When alternating current passes through the multiple coils in the stator, a rotating magnetic field is generated in the positioning, thereby driving the rotor to rotate, and there is no axial force. In this case, the slots in the stator assembly are set as oblique slots, and the magnetic field generated is an inclined magnetic field, which applies a part of the axial force to the rotor assembly while driving it to rotate, and the direction of the axial force rushes toward the pump casing, and then the rotor assembly transmits this part of the axial force to the impeller shaft, offsetting part of the axial force generated on the impeller shaft due to the difference in the front and rear covers of the water pump and the liquid reaction force, reducing the wear between the impeller shaft and the lower bearing, reducing noise, improving efficiency, and being easy to use and highly reliable.

[0005] Preferably, the stator assembly and the rotor assembly are not coaxial; in an ordinary water pump motor, the rotor and the stator are coaxial, and no axial force is generated. In the present case, the stator assembly and the rotor assembly are set to be eccentrically connected. Since the wire slots in the stator assembly of the present case are set to be inclined, the eccentric connection between the stator assembly and the rotor assembly will generate a part of reverse axial force, and the direction of the axial force points to the direction of the impeller on the impeller shaft, which again offsets a part of the axial force on the impeller shaft caused by the difference between the front and rear cover plates of the water pump and the liquid reaction force, thereby improving convenience.

[0006] Preferably, the inclination angle of the wire slot on the stator assembly is 20°; in this case, the inclination angle of the wire slot is β, β is 20°; when the electromagnetic torque TN = 0.45N·m, the stator inner diameter D = 0. stator assembly m, the inclined slot angle β = 20°, the axial force generated by the inclined slot is 7.7N.

[0007] Preferably, the center distance between the stator assembly and the rotor assembly is 1.5 mm. Through the above setting, it can be obtained through simulation calculation that when the spacing is 1.5 mm, the axial force generated is 5.3N.

[0008] Preferably, there is a distance between the bearing at the lower end of the rotor assembly and the bottom cover of the casing; through the above arrangement, wear between the rotor assembly and the bottom cover of the casing is prevented.

[0009] Preferably, the distance between the bearing at the lower end of the rotor assembly and the bottom cover of the casing is 3 mm.

[0010] Compared with the prior art, the utility model has the following beneficial effects: by setting the wire slots on the stator as inclined slots and setting the stator and the rotor to be eccentrically connected, the stator generates an inclined rotating magnetic field, thereby offsetting a part of the axial force generated by the outside on the impeller shaft of the rotor, reducing the wear of the impeller shaft on the rotor, reducing noise, being easy to use and having high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an exploded view of the utility model;

[0012] Figure 2 is a schematic diagram of the structure of the stator assembly;

[0013] Figure 3 is a schematic diagram of the cross-sectional structure of the stator assembly;

[0014] Figure 4 It is a cross-sectional structural schematic diagram of the utility model.

[0015] Markings in the attached figure: 1. Pump casing; 2. Rotor assembly; 3. Waterproof casing; 4. Stator assembly; 5. Impeller shaft; 6. Casing bottom cover; 7. Power-carrying coil. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0017] Example

[0018] like Figures 1 to 4 The high-efficiency, low-noise pump structure of the utility model includes a pump casing 1, a rotor assembly 2, a water-proof casing 3, a stator assembly 4, an impeller shaft 5 and a casing bottom cover 6. The impeller shaft 5 is fixedly mounted on the rotor assembly 2, and a bearing is arranged at the lower part of the impeller shaft 5, and the bearing is fixedly mounted on the casing bottom cover 6. The pump casing 1 is fixedly connected to the casing bottom cover 6, and the stator assembly 4 is fixedly mounted in the casing bottom cover 6. The casing bottom cover 6 is arranged in the pump casing 1, and a plurality of wire slots are arranged in the stator assembly 4. A coil is arranged on the stator assembly 4, and the coil is wound in the plurality of wire slots. A bearing is arranged at the lower end of the rotor assembly 2; the plurality of wire slots on the stator assembly 4 are all arranged obliquely on the stator assembly 4, and there is an angle between the wire slots and the axis of the stator assembly 4; in the motor in the prior art The wire slots on the stator are straight slots, and the coils are wound in the straight slots. When alternating current passes through the multiple coils in the stator, a rotating magnetic field is generated in the positioning, thereby driving the rotor to rotate, and it has no axial force; in this case, by setting the wire slots in the stator assembly 4 as oblique slots, the magnetic field generated is an inclined magnetic field, thereby driving the rotor assembly 2 to rotate while exerting a part of the axial force on the rotor assembly 2, and the direction of the axial force rushes toward the pump casing 1, and then the rotor assembly 2 transmits this part of the axial force to the impeller shaft 5, offsetting part of the axial force generated on the impeller shaft 5 due to the difference between the front and rear cover plates of the water pump and the liquid reaction force, reducing the wear between the impeller shaft 5 and the lower bearing, reducing noise, improving efficiency, easy to use, and high reliability.

[0019] The stator assembly 4 is not coaxial with the rotor assembly 2. In an ordinary water pump motor, the rotor is coaxial with the stator, and no axial force is generated. In this case, the stator assembly 4 and the rotor assembly 2 are set to be eccentrically connected. Since the wire slots in the stator assembly 4 in this case are set to an inclined state, the eccentric connection between the stator assembly 4 and the rotor assembly 2 will generate a part of reverse axial force, and the direction of the axial force points to the direction of the impeller on the impeller shaft 5, which again offsets a part of the axial force generated on the impeller shaft 5 by the difference between the front and rear cover plates of the water pump and the liquid reaction force, thereby improving convenience.

[0020] As the instruction manual Figure 3 The inclination angle of the wire slots on the stator assembly 4 is 20°, and the energized coil 7 is wound in multiple wire slots of the stator assembly 4. In this case, the inclination angle of the wire slots is β, and β is 20°.

[0021] The center distance between the stator assembly 4 and the rotor assembly 2 is 1.5 mm. The distance between the bearing at the lower end of the rotor assembly 2 and the bottom cover 6 of the housing is 3 mm.

[0022] In this case, when the pump head H = 12m, the impeller sealing ring radius Rm = 0.015m, the impeller hub radius Rh = 0.0025m, the total axial force A = k×g×ρ×H×π×(Rm2-Rh2)×i = 48.5N, (k is the specific speed coefficient, ns=30~100, k=0.6; ns=100~220, k=0.7; ns=240~280, k=0.8, k=0.6 in this case); g is the acceleration of gravity, g=9.81m / s2 in this case; ρ is the density of the conveyed medium, ρ=1000kg / m3 in this case; i is the number of pump stages, i=1 in this case.

[0023] In this case, the axial force generated by the misalignment of the center lines of the stator assembly 4 and the rotor assembly 2 is 5.3N when the center distance is 1.5 through simulation calculation.

[0024] In this case, the axial force generated when the wire slots on the stator assembly 4 are set to be inclined at 20° is: electromagnetic torque TN = 0.45 N·m, the inner diameter D of the stator assembly 4 is 0.04m, the inclined slot angle β is 20°, and the inclined slot axial force is: Fma = TN*sinβ / (D / 2) = 7.7N.

[0025] The pump casing 1, watertight casing 3, impeller shaft 5 and power coil 7 of the high-efficiency, low-noise pump structure of the utility model are all purchased on the market. Technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technical personnel in this field to make creative labor.

[0026] 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 principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A high-efficiency, low-noise pump structure, comprising a pump casing (1), a rotor assembly (2), a watertight casing (3), a stator assembly (4), an impeller shaft (5) and a casing bottom cover (6), wherein the impeller shaft (5) is fixedly mounted on the rotor assembly (2), a bearing is arranged at the lower part of the impeller shaft (5), and the bearing is fixedly mounted on the casing bottom cover (6), the pump casing (1) is fixedly connected to the casing bottom cover (6), the stator assembly (4) is fixedly mounted in the casing bottom cover (6), the casing bottom cover (6) is arranged in the pump casing (1), a plurality of wire slots are arranged in the stator assembly (4), a coil is arranged on the stator assembly (4), the coil is wound in the plurality of wire slots, and a bearing is arranged at the lower end of the rotor assembly (2); characterized in that: The plurality of wire slots on the stator assembly (4) are all arranged obliquely on the stator assembly (4), and an angle is formed between the wire slots and the axis of the stator assembly (4).

2. A high-efficiency, low-noise pump structure as claimed in claim 1, characterized in that: The stator assembly (4) is not coaxial with the rotor assembly (2).

3. A high-efficiency, low-noise pump structure as claimed in claim 1, characterized in that: The inclination angle of the wire slots on the stator assembly (4) is 20°.

4. A high-efficiency, low-noise pump structure as claimed in claim 1, characterized in that: The center distance between the stator assembly (4) and the rotor assembly (2) is 1.5 mm.

5. A high-efficiency, low-noise pump structure as claimed in claim 1, characterized in that: There is a distance between the bearing at the lower end of the rotor assembly (2) and the casing bottom cover (6).

6. A high-efficiency, low-noise pump structure as claimed in claim 5, characterized in that: The distance between the bearing at the lower end of the rotor assembly (2) and the housing bottom cover (6) is 3 mm.

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