Outer rotor centrifugal fan capable of accelerating heat dissipation

Abstract

The utility model discloses an outer rotor centrifugal fan capable of accelerating heat dissipation, which is provided with a motor, the motor comprises a motor casing, a motor shaft, a stator iron core arranged on the motor shaft and a rotor magnetic steel combination arranged outside the stator iron core, the motor shaft extends out from two ends of the motor casing, and the rotor magnetic steel combination is arranged outside the stator iron core. A step convenient for embedding and installing a rotor magnetic steel combination is arranged in the motor shell in the circumferential direction, a plurality of radial air guide ribs are further arranged in the motor shell, an air guide channel is formed between every two air guide ribs, a plurality of air guide grooves are further distributed in the inner circumferential wall of the motor shell, and an air guide groove is formed between every two air guide ribs. The multiple air guide channels and the multiple air guide grooves communicate with each other to form a heat dissipation air channel. According to the outer rotor centrifugal fan capable of accelerating heat dissipation, the heat dissipation effect of the motor is remarkably improved, the structural strength of the motor is remarkably improved, and the service life of the motor is remarkably prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to an outer rotor centrifugal fan for accelerating heat dissipation. Background Art

[0002] Centrifugal fans are not only widely used in industrial and civil buildings in the fields of air conditioning, environmental protection, refrigeration, heating, drying, etc., but also have important applications in transportation, mining, metallurgy, energy and other fields. Their main functions are to increase air pressure, flow, form airflow, etc.

[0003] However, the existing centrifugal fan motors on the market have poor heat dissipation. When powered on, the stator core will heat up, but because the stator core is enclosed inside the motor housing, the heat dissipation effect is poor, which leads to overheating of the stator core and reduced lifespan. At the same time, overheating of the stator core will also cause overheating and damage to the bearings. In addition, the motor rotor of the centrifugal fan is squeezed and installed in the motor housing in an interference fit manner. The interference between the motor rotor and the motor housing is large, which can easily cause the motor rotor to deform. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the problems existing in the above-mentioned background technology, an outer rotor centrifugal fan with accelerated heat dissipation is provided, which significantly improves the heat dissipation effect of the motor and significantly improves the structural strength and service life of the motor.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an outer rotor centrifugal fan for accelerating heat dissipation, comprising a motor, the motor comprising a motor housing, a motor shaft, a stator core mounted on the motor shaft, and a rotor magnetic steel combination mounted outside the stator core, the motor shaft extending from both ends of the motor housing, a step is provided in the inner circumferential direction of the motor housing for facilitating the embedding and installation of the rotor magnetic steel combination, a plurality of radial air guide ribs are further provided inside the motor housing, an air guide channel is formed between every two air guide ribs, a plurality of air guide grooves are further arranged on the inner circumferential wall of the motor housing, an air guide groove is provided between every two air guide ribs, and a plurality of air guide channels and a plurality of air guide grooves are interconnected to form a heat dissipation air duct.

[0006] To further specifically define, in the above technical solution, the air guide ribs are long strip convex ribs, the air guide grooves are square air guide grooves, and the air guide channel is a fan-shaped structure that is narrow inside and wide outside.

[0007] It is further specifically defined that, in the above technical solution, the outer opening width of the air guide channel is greater than the opening width of the air guide groove.

[0008] To further specifically define, in the above technical solution, the rotor magnetic steel combination is composed of a rotor ring and a plurality of magnetic steels with different magnetic poles arranged on its inner circumferential wall.

[0009] It is further specifically defined that, in the above technical solution, the step is located between the plurality of air guide ribs and the plurality of air guide grooves.

[0010] To further specifically define, in the above technical solution, the motor housing is cast from aluminum alloy material.

[0011] To further specifically define, in the above technical solution, the motor is a brushless DC motor.

[0012] The beneficial effects of the utility model are as follows: the outer rotor centrifugal fan for accelerating heat dissipation provided by the utility model is provided with a plurality of radial air guide ribs inside the motor shell, a plurality of air guide grooves are arranged on the inner circumferential wall of the motor shell, an air guide channel is formed between every two air guide ribs, an air guide groove is provided between every two air guide ribs, a plurality of air guide channels and a plurality of air guide grooves are interconnected to form a heat dissipation duct, the air flow inside the motor shell is circulated, and the heat dissipation effect of the stator core in the motor is improved; at the same time, a plurality of air guide grooves are arranged on the inner circumferential wall of the motor shell, so that the rotor in the motor is partially installed in the motor shell with an interference fit, and since the rotor and the motor shell are in an interference fit, the interference amount between the two is small, and the interference contact surface is distributed at circumferential intervals, so the interference amount can be appropriately increased to ensure that the rotor can be firmly fixed in the motor shell, and it is not easy to cause the rotor to deform, which greatly improves the structural strength and service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of the outer rotor centrifugal fan for accelerating heat dissipation of the utility model;

[0015] Figure 2 It is a schematic diagram of the assembly structure of the motor housing and the motor in the outer rotor centrifugal fan;

[0016] Figure 3 It is a schematic diagram of the structure of the motor housing in an outer rotor centrifugal fan;

[0017] Figure 4 This is a front view of the motor housing in an outer rotor centrifugal fan.

[0018] The numbers in the attached drawings are: 1, motor housing; 11, wind guide ribs; 12, wind guide channel; 13, wind guide groove; 2, motor shaft. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "one side", "the other side", "both sides", "between", "middle", "upper end", "lower end", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The utility model of the external rotor centrifugal fan for accelerating heat dissipation has a motor, which includes a motor housing 1, a motor shaft 2, a stator core mounted on the motor shaft 2, and a rotor magnetic steel assembly mounted outside the stator core. The motor shaft 2 extends from both ends of the motor housing 1. The motor housing 1 is provided with steps in the inner circumferential direction for easy embedding and installation of the rotor magnetic steel assembly. The motor housing 1 is also provided with a plurality of radial air guide ribs 11, and an air guide channel 12 is formed between every two air guide ribs 11. The inner circumferential wall of the motor housing 1 is also provided with a plurality of air guide grooves 13, and there is an air guide groove 13 between every two air guide ribs 11. The plurality of air guide channels 12 and the plurality of air guide grooves 13 are interconnected to form a heat dissipation air duct. There are two motors, which are relatively distributed. The two motors share a motor shaft 2. A magnetic field coupling is formed between the stator core and the rotor magnetic steel assembly. The magnetic field coupling is a phenomenon in which the current change of a coil generates an induced electromotive force in the adjacent coil.

[0023] Among them, the wind guide rib 11 is a long strip convex rib, the wind guide groove 13 is a square wind guide groove, and the wind guide channel 12 is a fan-shaped structure that is narrow inside and wide outside. The outer width of the wind guide channel 12 is greater than the opening width of the wind guide groove 13. The rotor magnetic steel combination is composed of a rotor ring and a plurality of magnetic steels with different magnetic poles arranged on its inner circumferential wall. The step is located between the plurality of wind guide ribs 11 and the plurality of wind guide grooves 13. The motor housing 1 is cast from aluminum alloy material. Cast aluminum alloy has the advantages of low density, high specific strength, good corrosion resistance and casting processability, and little restriction on part structure design. The motor is a brushless DC motor. The brushless DC motor consists of a motor body and a driver. It is a typical mechatronics product. A brushless motor refers to a motor without brushes and a commutator (or collector ring), also known as a commutatorless motor. The brushless DC motor can be made relatively thin.

[0024] The utility model accelerates the heat dissipation of the outer rotor centrifugal fan, by arranging a plurality of radial air guide ribs 11 inside the motor housing 1, arranging a plurality of air guide grooves 13 on the inner circumferential wall of the motor housing 1, forming an air guide channel 12 between every two air guide ribs 11, and providing an air guide groove 13 between every two air guide ribs 11, and the plurality of air guide channels 12 and the plurality of air guide grooves 13 are interconnected to form a heat dissipation duct, circulating the air flow inside the motor housing 1, and improving the heat dissipation effect of the stator core in the motor; at the same time, the air guide ribs 11 also play the role of reinforcing ribs, saving materials, and the entire motor housing 1 can be made thinner; in addition, by arranging a plurality of air guide grooves 13 on the inner circumferential wall of the motor housing 1, the rotor in the motor is partially installed in the motor housing 1 by interference fit, and since the rotor and the motor housing 1 are interference fit, the interference amount between the two is small, and the interference contact surface is distributed at circumferential intervals, so the interference amount can be appropriately increased to ensure that the rotor can be firmly fixed in the motor housing 1, and it is not easy to cause the rotor to deform, which greatly improves the structural strength and service life of the motor.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An outer rotor centrifugal fan for accelerating heat dissipation, characterized in that: A motor is provided, the motor comprising a motor housing (1), a motor shaft (2), a stator core mounted on the motor shaft (2), and a rotor magnetic steel assembly mounted outside the stator core, the motor shaft (2) extending from both ends of the motor housing (1), a step is provided in the inner circumferential direction of the motor housing (1) for facilitating the embedding and installation of the rotor magnetic steel assembly, a plurality of radial air guide ribs (11) are further provided inside the motor housing (1), an air guide channel (12) is formed between every two air guide ribs (11), a plurality of air guide grooves (13) are further arranged on the inner circumferential wall of the motor housing (1), an air guide groove (13) is provided between every two air guide ribs (11), and the plurality of air guide channels (12) and the plurality of air guide grooves (13) are interconnected to form a heat dissipation air duct.

2. The outer rotor centrifugal fan for accelerating heat dissipation according to claim 1, characterized in that: The air guide ribs (11) are long strip convex ribs, the air guide grooves (13) are square air guide grooves, and the air guide channel (12) is a fan-shaped structure that is narrow inside and wide outside.

3. The outer rotor centrifugal fan for accelerating heat dissipation according to claim 2, characterized in that: The outer opening width of the air guide channel (12) is greater than the opening width of the air guide groove (13).

4. The outer rotor centrifugal fan for accelerating heat dissipation according to claim 1, characterized in that: The rotor magnetic steel combination is composed of a rotor ring and a plurality of magnetic steels with different magnetic poles arranged on the inner circumferential wall thereof.

5. The outer rotor centrifugal fan for accelerating heat dissipation according to claim 1, characterized in that: The step is located between the plurality of air guide ribs (11) and the plurality of air guide grooves (13).

6. The outer rotor centrifugal fan for accelerating heat dissipation according to claim 1, characterized in that: The motor housing (1) is cast from an aluminum alloy material.

7. The outer rotor centrifugal fan for accelerating heat dissipation according to claim 1, characterized in that: The motor is a brushless DC motor.

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