An outer rotor direct current brushless motor for a blower

Abstract

The utility model relates to motor manufacturing technical field, concretely for a kind of outer rotor direct current brushless motor for storm machine, including first shell, second shell, pivot and protection device, the second shell is installed in one end of first shell, the pivot is installed in the inside of first shell and second shell, the protection device is installed in one end of first shell, the protection device includes first mounting ring and protection plate, the protection plate is fixedly connected in the inside of first mounting ring, the first mounting ring is connected in the end of first shell far from second shell, the inside fixed connection of protection plate has second mounting ring, the second mounting ring is connected in the end of first shell far from second shell, the outer surface of first mounting ring is fixedly connected with mounting plate, the protection device of the utility model, blocking foreign matter into equipment inside is realized, and the practicability of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, and in particular to an external rotor DC brushless motor for a blower. Background Technology

[0002] The handheld blower is a portable, wireless, and powerful air-blowing device. Its core function is to achieve cleaning, drying, and dust removal in various scenarios through high-speed airflow. It is widely used in household cleaning, outdoor snow removal, workshop dust removal, car dehydration, camping, and other scenarios. The main body adopts a lightweight ABS shell and a non-slip handle, equipped with an external rotor DC brushless motor (maximum speed up to 130,000 rpm) and a turbocharger structure, and is equipped with a rechargeable lithium battery. It supports multiple wind speed adjustments, with a maximum wind speed of 52-120 m / s. It combines portability with strong power. The external rotor DC brushless motor is a high-efficiency motor with a fixed stator and a rotor wrapped around the outside of the stator. Its core function is to convert electrical energy into mechanical energy. With its high power density, low noise, and long lifespan, it is widely used in fans, water pumps, drones, medical devices, and other scenarios.

[0003] However, the existing equipment has the following shortcomings: When the existing equipment is in use, foreign objects can easily enter the equipment through the heat dissipation holes at one end of the first outer shell. Foreign objects can easily adhere to the surface of the rotating shaft inside the equipment, causing the rotating shaft to jam.

[0004] Therefore, we propose an external rotor DC brushless motor for blowers to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies where foreign objects can easily enter the equipment through the heat dissipation holes of the first outer shell during use, causing the rotating shaft to jam and making it difficult for the shaft to rotate smoothly. Therefore, this invention proposes an external rotor DC brushless motor for a blower.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an external rotor DC brushless motor for a blower, comprising a first housing, a second housing, a rotating shaft, and a protective device. The second housing is installed at one end of the first housing, the rotating shaft is installed inside the first and second housings, and the protective device is installed at one end of the first housing. The protective device includes a first mounting ring and a protective plate. The protective plate is fixedly connected inside the first mounting ring, the first mounting ring is fitted and connected to the end of the first housing away from the second housing, a second mounting ring is fixedly connected inside the protective plate, the second mounting ring is fitted and connected to the end of the first housing away from the second housing, and a mounting plate is fixedly connected to the outer surface of the first mounting ring.

[0007] Furthermore, a limiting block is fixedly connected to the surface of the first outer shell, and a connecting block is fixedly connected to one end of the mounting plate near the second outer shell. By setting the limiting block, the elastic plate can be limited, reducing the difficulty of limiting the elastic plate during use.

[0008] Furthermore, an elastic plate is fixedly connected to the end of the connecting block away from the mounting plate. The elastic plate can limit the movement of the first mounting ring.

[0009] Furthermore, the surface of the limiting block is provided with mounting holes to facilitate the movement of the elastic plate.

[0010] Furthermore, a locking block is fixedly connected to the surface of the elastic plate away from the connecting block, and the locking block is provided to facilitate the limiting of the elastic plate.

[0011] Furthermore, the end of the card block near the connecting block is attached to the surface of the limiting block.

[0012] Furthermore, a mounting groove is provided at one end of the first mounting ring near the first outer shell.

[0013] Furthermore, a gasket is installed inside the mounting slot.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows: In this invention, by setting up a protective device, the internal structure of the equipment is effectively protected, which plays a role in blocking foreign objects from entering the equipment. This reduces the problem that foreign objects can easily enter the equipment through the heat dissipation holes at one end of the first outer shell during use, and that foreign objects can easily adhere to the surface of the rotating shaft inside the equipment, causing the shaft to jam. This protective device effectively blocks foreign objects from entering the equipment and improves the practicality of the equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This utility model provides a three-dimensional structural diagram of an external rotor DC brushless motor for a blower; Figure 2 This utility model provides a side view of an external rotor DC brushless motor for a blower. Figure 3 This utility model provides a partial structural schematic diagram of an external rotor DC brushless motor for a blower; Figure 4 This invention proposes an external rotor DC brushless motor for a blower. Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This invention proposes an external rotor DC brushless motor for a blower. Figure 3 Enlarged structural diagram at point B.

[0017] Legend: 1. First outer shell; 2. Second outer shell; 3. Rotating shaft; 4. Protective device; 41. First mounting ring; 42. Mounting plate; 43. Protective plate; 44. Second mounting ring; 45. Limiting block; 46. Connecting block; 47. Elastic plate; 48. Locking block; 49. Mounting hole; 410. Mounting groove; 411. Gasket. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] Please see Figures 1-5 This utility model provides a technical solution: an external rotor DC brushless motor for a blower, including a first housing 1, a second housing 2, a rotating shaft 3 and a protective device 4. The second housing 2 is installed at one end of the first housing 1, and the rotating shaft 3 is installed inside the first housing 1 and the second housing 2.

[0020] The first outer shell 1 and the second outer shell 2 together constitute the core protective shell of the motor. They are made of high-strength aluminum alloy in one piece, which is both lightweight and impact-resistant, and can withstand the airflow impact and outdoor sand and gravel collision during the operation of the blower. The rotating shaft 3 is the core of the motor's power output. It is made of high-hardness alloy steel and the surface is nitrided for wear resistance. It is combined with precision bearings to ensure stability during high-speed rotation. The protective device 4 is a dedicated protective structure at the end of the motor. It can accurately block the intrusion of foreign objects and ensure smooth heat dissipation of the motor. It is suitable for the harsh working environment of the blower with high speed and strong airflow.

[0021] The specific design and function of its protective device 4 will be explained below.

[0022] In this embodiment: the protective device 4 is installed at one end of the first housing 1. The protective device 4 includes a first mounting ring 41 and a protective plate 43. The first mounting ring 41 is the mounting carrier of the protective plate 43 and is made of high-strength aluminum alloy of the same material as the housing to ensure structural strength and installation compatibility. The protective plate 43 is the core protective component. It adopts a hollow and ventilated structure to block foreign objects without affecting the heat dissipation of the motor. The surface is treated with anti-corrosion to resist the erosion of outdoor humid environment. The protective plate 43 is fixedly connected to the inside of the first mounting ring 41. The first mounting ring 41 is attached to the end of the first housing 1 away from the second housing 2. The second mounting ring 44 is fixedly connected to the inside of the protective plate 43. The second mounting ring 44 is attached to the end of the first housing 1 away from the second housing 2. The mounting plate 42 is fixedly connected to the outer surface of the first mounting ring 41.

[0023] Specifically, a limiting block 45 is fixedly connected to the surface of the first outer shell 1. The limiting block 45 is integrally formed with the first outer shell 1, and the structure is stable, providing a precise locking point for the locking block 48. A connecting block 46 is fixedly connected to one end of the mounting plate 42 near the second outer shell 2.

[0024] In this embodiment: by setting the limiting block 45, the elastic plate 47 can be limited, reducing the difficulty of limiting the elastic plate 47 when the equipment is in use.

[0025] Specifically, a spring plate 47 is fixedly connected to the end of the connecting block 46 away from the mounting plate 42. The spring plate 47 is made of highly elastic stainless steel, which has good deformation and reset capabilities, can be reused and is not easily fatigued. The spring plate 47 can limit the first mounting ring 41.

[0026] Specifically, the surface of the limiting block 45 is provided with a mounting hole 49. The size of the mounting hole 49 is adapted to the elastic plate 47, providing an insertion channel for the elastic plate 47. The hole wall is smooth, making it easy to insert and remove the elastic plate 47. The mounting hole 49 is provided to facilitate the movement of the elastic plate 47.

[0027] Specifically, a locking block 48 is fixedly connected to the end surface of the elastic plate 47 away from the connecting block 46. The locking block 48 adopts an arc transition design to facilitate insertion into the mounting hole 49. At the same time, the locking surface has an anti-slip structure to increase the friction with the limiting block 45. The locking block 48 is set to facilitate the limiting of the elastic plate 47.

[0028] Specifically, the end of the locking block 48 near the connecting block 46 is attached to the surface of the limiting block 45. After attachment, the contact area is large, the force is even, and the locking is firm.

[0029] Specifically, the first mounting ring 41 has a mounting groove 410 at one end near the first outer shell 1. The mounting groove 410 is the mounting space for the gasket 411, and its size is precisely matched with the gasket 411.

[0030] Specifically, a gasket 411 is installed inside the mounting groove 410. The gasket 411 is made of high-temperature resistant silicone material, which has good sealing and cushioning properties and can fill the gap between the first mounting ring 41 and the first outer shell 1.

[0031] Working principle: When installing the protective plate 43, the user attaches the first mounting ring 41 to the surface of the first outer shell 1 away from the second outer shell 2, then presses the elastic plate 47 to move the locking block 48. After inserting the elastic plate 47 into the mounting hole 49 inside the limiting block 45, the user releases the elastic plate 47 to engage the locking block 48 with the surface of the limiting block 45, mechanically locking the protective plate 43. By setting the protective device 4, the internal parts of the equipment are effectively protected, preventing foreign objects from entering the equipment. This reduces the problem of foreign objects easily entering the equipment through the heat dissipation holes at one end of the first outer shell 1 and easily adhering to the surface of the rotating shaft 3 inside the equipment, causing the rotating shaft 3 to jam. This protective device 4 effectively prevents foreign objects from entering the equipment, improving the practicality of the equipment.

[0032] The above description discloses only one or more preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of the present utility model still fall within the scope of the present utility model.

Claims

1. An external rotor brushless DC motor for a blower, comprising a first housing (1), a second housing (2), a rotating shaft (3), and a protective device (4), characterized in that: The second outer casing (2) is installed at one end of the first outer casing (1), and the rotating shaft (3) is installed inside the first outer casing (1) and the second outer casing (2); The protective device (4) is installed at one end of the first outer shell (1). The protective device (4) includes a first mounting ring (41) and a protective plate (43). The protective plate (43) is fixedly connected to the inside of the first mounting ring (41). The first mounting ring (41) is fitted to the end of the first outer shell (1) away from the second outer shell (2). A second mounting ring (44) is fixedly connected to the inside of the protective plate (43). The second mounting ring (44) is fitted to the end of the first outer shell (1) away from the second outer shell (2). The outer surface of the first mounting ring (41) is fixedly connected to the mounting plate (42).

2. The external rotor brushless DC motor for a blower according to claim 1, characterized in that: A limiting block (45) is fixedly connected to the surface of the first outer shell (1), and a connecting block (46) is fixedly connected to one end of the mounting plate (42) near the second outer shell (2).

3. The external rotor brushless DC motor for a blower according to claim 2, characterized in that: The end of the connecting block (46) away from the mounting plate (42) is fixedly connected to an elastic plate (47).

4. The external rotor brushless DC motor for a blower according to claim 2, characterized in that: The surface of the limiting block (45) is provided with mounting holes (49).

5. The external rotor brushless DC motor for a blower according to claim 3, characterized in that: A locking block (48) is fixedly connected to the surface of the elastic plate (47) away from the connecting block (46).

6. The external rotor brushless DC motor for a blower according to claim 5, characterized in that: The end of the card block (48) near the connecting block (46) is attached to the surface of the limiting block (45).

7. The external rotor brushless DC motor for a blower according to claim 1, characterized in that: The first mounting ring (41) has a mounting groove (410) at one end near the first outer shell (1).

8. The external rotor brushless DC motor for a blower according to claim 7, characterized in that: A gasket (411) is installed inside the mounting slot (410).

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