Outer rotor centrifugal fan easy to dissipate heat and convenient to manufacture

Abstract

The utility model discloses an outer rotor centrifugal fan easy to radiate heat and convenient to manufacture, which is provided with a motor, the motor comprises a motor casing, a motor shaft, a stator iron core mounted on the motor shaft and a rotor magnetic steel combination mounted outside the stator iron core, the motor shaft extends out of two ends of the motor casing, the motor shaft is a hollow shaft, and the rotor magnetic steel combination is connected with the motor casing. The outer ring of the motor shaft is provided with a flat surface along the length direction, the shape of the outer ring of the motor shaft is the same as that of an inner hole of the stator iron core, the motor shaft is provided with a positioning groove, a positioning clamp spring is clamped in the positioning groove, and the motor shaft is a step-free shaft with only the positioning groove on the surface. And the stator iron core is fixed on the motor shaft through positioning clamp springs positioned on two sides of the stator iron core. According to the outer rotor centrifugal fan easy to dissipate heat and convenient to manufacture, the motor shaft is of a hollow shaft structure, the weight is light, the cost is reduced, and the heat dissipation effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to an outer rotor centrifugal fan which is easy to dissipate heat and is convenient to manufacture. 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 motor shafts of the existing centrifugal fans on the market are solid shafts, which are generally made of thicker materials, so they are relatively heavy and costly. At the same time, the heat dissipation effect of the solid shaft is poor, and for centrifugal fans that need to run for a long time, overheating problems are very likely to occur. 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 which is easy to dissipate heat and is easy to manufacture is provided, the motor shaft adopts a hollow shaft structure, is light in weight, reduces cost and has good heat dissipation effect.

[0005] The utility model solves the technical problem by adopting the following technical solution: an outer rotor centrifugal fan which is easy to dissipate heat and manufacture, 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, the motor shaft being a hollow shaft, the outer ring of the motor shaft having a flat surface along the length direction, the shape of the outer ring of the motor shaft being the same as the shape of the inner hole of the stator core, a positioning groove being provided on the motor shaft, a positioning retaining spring being clamped in the positioning groove, the motor shaft being a stepless shaft having only the positioning groove on the surface, and the stator core being fixed on the motor shaft by positioning retaining springs located on both sides thereof.

[0006] 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.

[0007] To further specifically define, in the above technical solution, the shell is cast from aluminum alloy material.

[0008] To further specifically define, in the above technical solution, the motor is a brushless DC motor.

[0009] The beneficial effects of the utility model are as follows: the outer rotor centrifugal fan provided by the utility model is easy to dissipate heat and is easy to manufacture, by designing the motor shaft into a hollow shaft structure, and arranging a flat surface along the length direction on the motor shaft, the shape of the outer ring of the motor shaft is the same as the shape of the inner hole of the stator core, a positioning groove is opened on the motor shaft, a positioning spring is clamped in the positioning groove, and the stator core is fixed to the motor shaft by the positioning spring, which can not only ensure the normal operation of the outer rotor centrifugal fan, but also greatly reduce the weight and cost of the motor shaft. At the same time, since the inside of the hollow shaft is hollow, the heat can be dissipated faster. For the outer rotor centrifugal fan that runs for a long time, the hollow shaft has a better heat dissipation effect than the solid shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] 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.

[0011] Figure 1 This is a schematic diagram of the structure of the outer rotor centrifugal fan of the utility model which is easy to dissipate heat and is convenient to manufacture;

[0012] Figure 2 It is a schematic diagram of the assembly structure of the housing and the motor in the outer rotor centrifugal fan;

[0013] Figure 3 It is a schematic diagram of the structure of the motor shaft in an external rotor centrifugal fan;

[0014] Figure 4 It is a side view of the motor shaft in an external rotor centrifugal fan.

[0015] The numbers in the accompanying drawings are: 1, housing; 2, motor shaft; 21, flat surface; 22, positioning groove; 3, positioning retaining spring. DETAILED DESCRIPTION

[0016] 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.

[0017] 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.

[0018] 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.

[0019] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The utility model is an outer rotor centrifugal fan which is easy to dissipate heat and manufacture, and has a motor. The motor includes a motor housing 1, a motor shaft 2, a stator core installed on the motor shaft 2, and a rotor magnetic steel combination installed outside the stator core. The motor shaft 2 extends from both ends of the motor housing 1. The motor shaft 2 is a hollow shaft. The outer ring of the motor shaft 2 has a flat surface 21 along the length direction. The shape of the outer ring of the motor shaft 2 is the same as the shape of the inner hole of the stator core. A positioning groove 22 is opened on the motor shaft 2, and a positioning retaining spring 3 is clamped in the positioning groove 22. The motor shaft 2 is a stepless shaft with only the positioning groove 22 on the surface. The stator core is fixed to the motor shaft 2 by the positioning retaining springs 3 located on both sides thereof.

[0020] There are two motors, which are relatively distributed and share a motor shaft 2. A magnetic field coupling is formed between the stator core and the rotor magnet. The magnetic field coupling is a phenomenon in which a current change in one coil generates an induced electromotive force in an adjacent coil.

[0021] The rotor magnet assembly is composed of a rotor ring and a plurality of magnets with different magnetic poles arranged on its inner circumferential wall. The motor housing 1 is cast from an 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 parts 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.

[0022] The outer rotor centrifugal fan of the utility model is easy to dissipate heat and is easy to manufacture. The motor shaft 2 is designed to be a hollow shaft structure, and a flat surface 21 is arranged on the motor shaft 2 along the length direction. The shape of the outer ring of the motor shaft 2 is the same as the shape of the inner hole of the stator core. A positioning groove 22 is arranged on the motor shaft 2, and a positioning spring 3 is clamped in the positioning groove 22. The stator core is fixed to the motor shaft 2 by the positioning spring 3. This can not only ensure the normal operation of the outer rotor centrifugal fan, but also greatly reduce the weight and cost of the motor shaft 2. At the same time, since the inside of the hollow shaft is hollow, the heat can be dissipated faster. For the outer rotor centrifugal fan that runs for a long time, the hollow shaft has a better heat dissipation effect than the solid shaft.

[0023] 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 that is easy to dissipate heat and manufacture, 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), the motor shaft (2) being a hollow shaft, the outer ring of the motor shaft (2) having a flat surface (21) along the length direction, the shape of the outer ring of the motor shaft (2) being the same as the shape of the inner hole of the stator core, a positioning groove (22) being provided on the motor shaft (2), a positioning retaining spring (3) being clamped in the positioning groove (22), the motor shaft (2) being a stepless shaft having only the positioning groove (22) on its surface, and the stator core being fixed to the motor shaft (2) by the positioning retaining springs (3) located on both sides thereof.

2. The outer rotor centrifugal fan according to claim 1, which is easy to dissipate heat and manufacture, is 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.

3. The outer rotor centrifugal fan according to claim 1, which is easy to dissipate heat and manufacture, is characterized in that: The motor housing (1) is cast from an aluminum alloy material.

4. The outer rotor centrifugal fan according to claim 1, which is easy to dissipate heat and manufacture, is characterized in that: The motor is a brushless DC motor.

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