Outer rotor centrifugal fan with ultrathin motor

Abstract

The outer rotor centrifugal fan is provided with a brushless direct current motor and a centrifugal impeller, the brushless direct current motor comprises a motor shell, a motor shaft, a stator iron core installed on the motor shaft and a rotor magnetic steel combination installed outside the stator iron core, the motor shaft extends out of the two ends of the motor shell, and the centrifugal impeller is installed on the motor shell. Self-tapping screw holes are formed in the inner rings of the motor shells, the two motor shells are oppositely distributed, self-tapping screws penetrate through the self-tapping screw holes to enable the two motor shells to be meshed with each other, the outer rings of the motor shells extend outwards to form flashes, and first mounting holes used for mounting the centrifugal impeller are formed in the flashes. According to the outer rotor centrifugal fan with the ultrathin motor, the brushless direct current motor is simple in structure and reasonable in design, and the improved brushless direct current motor can be smoothly applied to an existing outer rotor centrifugal fan.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to an outer rotor centrifugal fan with an ultra-thin motor. 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] Since brushless DC motors have the advantages of traditional DC motors and at the same time eliminate the carbon brushes and slip ring structures, brushless DC motors are used in more and more fields. At present, existing centrifugal fans on the market usually directly use purchased standard motors. Technicians will not change the structure of standard motors. The size of standard motors is thicker, the motor housing is also thicker, and the centrifugal impeller is directly installed on the motor housing. However, due to their own structural characteristics, existing brushless DC motors on the market cannot be directly applied to existing centrifugal fans. In other words, existing centrifugal fans cannot directly use purchased brushless DC motors, and the structure of brushless DC motors needs to be improved. 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 an ultra-thin motor is provided. The brushless DC motor has a simple structure and a reasonable design, and the improved brushless DC motor can be smoothly applied to the existing outer rotor centrifugal fan.

[0005] The utility model solves the technical problem by adopting the following technical solution: an outer rotor centrifugal fan with an ultra-thin motor, comprising a brushless DC motor and a centrifugal impeller, wherein the brushless DC motor comprises 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, wherein the motor shaft extends from both ends of the motor housing, and a self-tapping screw hole is provided on the inner ring of the motor housing, wherein two motor housings are relatively distributed and are engaged with each other by passing self-tapping screws through the self-tapping screw holes, and the outer ring of the motor housing extends outward to form a flash edge, and a first mounting hole for mounting the centrifugal impeller is provided on the flash edge.

[0006] To further specifically define, in the above technical solution, the flash and the motor housing are an integral structure cast from an ultra-thin aluminum alloy material.

[0007] To further specifically define, in the above technical solution, an annular groove for filling a sealing ring is provided on the inner end surface of the burr, and a second mounting hole corresponding to the first mounting hole is opened on the sealing ring.

[0008] To further specifically define, in the above technical solution, a plurality of blind holes are distributed in the circumferential direction of the outer end surface of the flash.

[0009] 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.

[0010] The beneficial effects of the utility model are as follows: the outer rotor centrifugal fan with an ultra-thin motor provided by the utility model is convenient for installing the brushless DC motor by arranging self-tapping screw holes on the inner ring of the motor shell, and the self-tapping screws pass through the self-tapping screw holes to engage the two motor shells with each other; the motor shell is designed to be an ultra-thin structure, and a flash is added to the outer ring of the motor shell, and a mounting hole is opened on the flash to facilitate the installation of the centrifugal impeller; the brushless DC motor has a simple structure and a reasonable design, and the improved brushless DC motor can be smoothly applied to the existing outer rotor centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 It is a structural schematic diagram of an outer rotor centrifugal fan with an ultra-thin motor of the utility model;

[0013] Figure 2 It is a schematic diagram of the assembly structure of the motor housing and the motor in the outer rotor centrifugal fan;

[0014] Figure 3 This is a schematic diagram of the structure of the motor housing in an external rotor centrifugal fan. Figure 1 ;

[0015] Figure 4 yes Figure 3 A front view of

[0016] Figure 5 This is a schematic diagram of the structure of the motor housing in an external rotor centrifugal fan. Figure 2 ;

[0017] Figure 6 yes Figure 5 Front view of .

[0018] The numbers in the accompanying drawings are: 1, motor housing; 2, motor shaft; 11, self-tapping screw hole; 3, flash; 31, first mounting hole; 32, annular groove; 33, blind hole. 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 , Figure 4 , Figure 5 and Figure 6 The utility model discloses an outer rotor centrifugal fan with an ultra-thin motor, which has a brushless DC motor and a centrifugal impeller. The brushless DC motor includes a motor housing 1, a motor shaft 2, a stator core mounted on the motor shaft 2, and a rotor magnetic steel combination mounted outside the stator core. The motor shaft 2 extends from both ends of the motor housing 1. The inner ring of the motor housing 1 has a self-tapping screw hole 11. The two motor housings 1 are relatively distributed and the two motor housings 1 are engaged with each other by passing the self-tapping screws through the self-tapping screw holes 11. The outer ring of the motor housing 1 extends outward to form a flash 3. The flash 3 is provided with a first mounting hole 31 for mounting a centrifugal impeller, that is, the centrifugal impeller is fixed on the flash 3 of the motor housing 1. There are two brushless DC motors, which are relatively distributed. The two brushless DC motors share a motor shaft 2. A magnetic field coupling is formed between the stator core and the rotor magnetic steel combination. The magnetic field coupling is a phenomenon in which the current change of a coil generates an induced electromotive force in an adjacent coil.

[0023] Among them, the brushless DC motor is composed of a motor body and a driver, and is a typical mechatronics product. A brushless motor refers to a motor without brushes and commutators (or collector rings), also known as a commutatorless motor. The brushless DC motor can be made relatively thin. The flash 3 and the motor housing 1 are an integral structure cast by ultra-thin aluminum alloy material. The cast aluminum alloy has the advantages of low density, high specific strength, good corrosion resistance and casting processability, and little restriction on the structural design of parts. An annular groove 32 for filling the sealing ring is provided on the inner end surface of the flash 3, and a second mounting hole corresponding to the first mounting hole 31 is provided on the sealing ring. A plurality of blind holes 33 are distributed in the circumferential direction of the outer end surface of the flash 3. The blind holes 33 are square blind holes. The design of the blind holes 33 can not only save materials, but also increase the heat dissipation area. 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. At the same time, a slot ring is also provided inside the motor housing 1 to reduce the processing amount and the amount of chips.

[0024] The utility model discloses an outer rotor centrifugal fan with an ultra-thin motor, by arranging a self-tapping screw hole 11 on the inner ring of a motor housing 1, and the self-tapping screw passes through the self-tapping screw hole 11 to engage the two motor housings 1 with each other, thereby facilitating the installation of a brushless DC motor; by designing the motor housing 1 to be an ultra-thin structure, and adding a burr 3 on the outer ring of the motor housing 1, and opening a first mounting hole 31 on the burr 3, so as to facilitate the installation of a centrifugal impeller; the brushless DC motor has a simple structure and a reasonable design, and the improved brushless DC motor can be smoothly applied to the existing outer rotor centrifugal fan; in addition, by adopting the motor housing 1 with an ultra-thin structure, the heat dissipation effect of the brushless DC motor can be greatly improved.

[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 with an ultra-thin motor, characterized in that: A brushless DC motor and a centrifugal impeller are provided. The brushless DC motor comprises a motor housing (1), a motor shaft (2), a stator core mounted on the motor shaft (2), and a rotor magnet assembly mounted outside the stator core. The motor shaft (2) extends from both ends of the motor housing (1). The inner ring of the motor housing (1) is provided with a self-tapping screw hole (11). Two motor housings (1) are arranged opposite to each other and are engaged with each other by passing self-tapping screws through the self-tapping screw holes (11). The outer ring of the motor housing (1) extends outward to form a burr (3). The burr (3) is provided with a first mounting hole (31) for mounting the centrifugal impeller.

2. The outer rotor centrifugal fan with an ultra-thin motor according to claim 1 is characterized in that: The flash edge (3) and the motor housing (1) are an integral structure formed by casting an ultra-thin aluminum alloy material.

3. The outer rotor centrifugal fan with an ultra-thin motor according to claim 1 is characterized in that: An annular groove (32) for filling a sealing ring is provided on the inner end surface of the burr (3), and a second mounting hole corresponding to the first mounting hole (31) is opened on the sealing ring.

4. The outer rotor centrifugal fan with an ultra-thin motor according to claim 1 is characterized in that: A plurality of blind holes (33) are distributed in the circumferential direction of the outer end surface of the flash edge (3).

5. The outer rotor centrifugal fan with an ultra-thin motor 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.

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