Brushless structure of high-efficiency main suction fan for sweeper

Abstract

The utility model discloses a brushless structure of a high-efficiency main suction fan for a sweeper, which relates to the field of fan design and comprises a fan volute, fan blades and a brushless motor. The fan volute comprises an upper shell and a lower shell, an air inlet is formed in the circle center of the lower shell, a shaft hole is formed in the circle center of the upper shell, the fan blades are installed between the upper shell and the lower shell, and air outlets are formed in the outer sides of the upper shell and the lower shell; the brushless motor is fixedly installed on the upper side of the upper shell, a rotor is arranged on the brushless motor, the rotor of the brushless motor is inserted into the shaft hole in a clearance fit mode, and the circle centers of the fan blades are fixedly installed on the rotor of the brushless motor; according to the brushless fan, the shaft hole is used for replacing an open groove for installing a brushless motor of a traditional brushless fan, the rotor of the brushless motor is inserted into the shaft hole to drive the fan blades to rotate, the fit clearance between the open groove and the brushless motor is avoided, the situation that air leaks from a middle hole is avoided, the air noise is reduced, the suction force and the air suction efficiency of the brushless fan under the same power are improved, and the service life of the brushless fan is prolonged. And the power is lower under the same suction force.

Description

Technical Field

[0001] This utility model relates to the field of fan design, and in particular to a brushless structure for a high-efficiency main suction fan for a sweeper. Background Technology

[0002] Currently common brushless fans utilize brushless motors to drive fan blades. For example, existing technology (publication number: CN211066420U, publication date: 2020.07.24) discloses a suction fan and a sweeper for use in sweeping machines. As can be seen from its cross-sectional view, a slot needs to be set on the other side of the air inlet to install the brushless motor. The rotating part of the brushless motor fits in this slot and needs to drive the fan blades to rotate. Therefore, the gap between the slot and the fan blades is large, which can lead to air leakage through the central hole. When air leaks, it generates a lot of noise, resulting in low suction efficiency, low suction power, and serious heat generation. Therefore, it is necessary to design an installation structure that does not leak air from the central hole to solve the defects of existing brushless fans. Utility Model Content

[0003] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0004] A brushless structure for a high-efficiency main suction fan in a sweeper includes a fan housing, fan blades, and a brushless motor.

[0005] The fan casing includes an upper casing and a lower casing. An air inlet is formed at the center of the lower casing, and a shaft hole is formed at the center of the upper casing. The fan blades are installed between the upper casing and the lower casing. Air outlets are formed on the outer sides of both the upper casing and the lower casing.

[0006] The brushless motor is fixedly installed on the upper side of the upper shell. The brushless motor is equipped with a rotor. The rotor clearance of the brushless motor is set to fit into the shaft hole. The center of the fan blade is fixedly installed on the rotor of the brushless motor.

[0007] Furthermore: the brushless motor includes a motor circuit board, a bearing housing, and a rolling bearing. The motor circuit board is fixedly mounted on the upper shell, and the bearing housing is fixedly mounted in the middle of the motor circuit board. The rotor of the brushless motor includes a circular cover and a rotating shaft. The rotating shaft is fixedly mounted at the center of the circular cover. The middle part of the rotating shaft is rotatably mounted in the bearing housing through the rolling bearing. The lower end of the rotating shaft is inserted into the shaft hole with a clearance fit. The center of the fan blade is fixedly mounted on the rotating shaft.

[0008] Furthermore: a coil winding is installed on the motor circuit board, a magnetic ring is fixedly installed on the inner side of the circular cover, the circular cover covers the coil winding, and the magnetic ring is located on the outer side of the coil winding.

[0009] Furthermore, the top side of the upper shell is formed with multiple arc-shaped heat sinks, which are spaced apart from each other.

[0010] Furthermore: a lifting frame is provided between the upper shell and the motor circuit board, a positioning hole is formed in the middle of the lifting frame, the bearing shaft is tightly fitted in the positioning hole, and a limit ring is formed on the outer side of the bottom end of the bearing seat, the limit ring is set on the bottom side of the lifting frame.

[0011] Furthermore, a sealing gasket is tightly fitted between the limiting ring of the lifting frame and the upper shell.

[0012] Furthermore: the upper edge of the lower shell is formed with several buckles, and the lower edge of the upper shell is formed with several snap-fit ​​edges. The buckles and snap-fit ​​edges are arranged vertically and vertically to each other, and the snap-fit ​​edges are snapped into the buckles one by one.

[0013] Compared with the prior art, the beneficial effects of this utility model are: using a shaft hole to replace the slot for installing the brushless motor in the traditional brushless fan, the rotor of the brushless motor is inserted into the shaft hole to drive the fan blades to rotate, thereby avoiding the gap between the slot and the brushless motor, and preventing air leakage from the central hole. The shaft hole can also ensure the stable rotation of the rotor, thus avoiding the defect of air leakage, reducing wind noise, and having greater suction force and higher suction efficiency at the same fan blade speed. Moreover, it generates less heat when working for a long time under the same suction force.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 A structural diagram from another perspective;

[0018] Figure 3 This is a half-sectional structural diagram of the present invention;

[0019] Figure 4 yes Figure 3 A structural diagram from another perspective;

[0020] Figure 5 This is an exploded structural diagram of the present invention;

[0021] Figure 6 yes Figure 5 A structural diagram from another perspective.

[0022] The figure shows: 1. Fan casing; 1.1. Upper casing; 1.2. Lower casing; 2. Fan blade; 3. Brushless motor; 3.1. Motor circuit board; 3.2. Bearing housing; 3.3. Rolling bearing; 4. Air inlet; 5. Shaft hole; 6. Air outlet; 7. Rotor; 7.1. Circular cover; 7.2. Shaft; 8. Arc-shaped heat sink; 9. Elevating frame; 10. Positioning hole; 11. Limiting ring; 12. Sealing gasket; 13. Buckle; 14. Snap-fit ​​edge. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1-6 As shown, the present invention provides a brushless structure for a high-efficiency main suction fan of a sweeper, comprising a fan volute 1, a fan blade 2, and a brushless motor 3.

[0029] The fan casing 1 includes an upper casing 1.1 and a lower casing 1.2. An air inlet 4 is formed at the center of the lower casing 1.2, and a shaft hole 5 is formed at the center of the upper casing 1.1. The fan blade 2 is installed between the upper casing 1.1 and the lower casing 1.2. An air outlet 6 is formed on the outer side of both the upper casing 1.1 and the lower casing 1.2.

[0030] The brushless motor 3 is fixedly installed on the upper side of the upper shell 1.1. The brushless motor 3 is provided with a rotor 7. The rotor 7 of the brushless motor 3 is fitted with the shaft hole 5 with clearance. The center of the fan blade 2 is fixedly installed on the rotor 7 of the brushless motor 3.

[0031] The principle is as follows: the shaft hole 5 is used to replace the slot for installing the brushless motor 3 in the traditional brushless fan. The rotor 7 of the brushless motor 3 is inserted into the shaft hole 5 to drive the fan blade 2 to rotate, thereby avoiding the gap between the slot and the brushless motor 3 and preventing air leakage in the middle hole. The shaft hole 5 can also ensure the stable rotation of the rotor 7, thus avoiding the defect of air leakage, reducing wind noise, and having greater suction force and higher suction efficiency at the same speed of the fan blade 2. Moreover, it generates less heat when working for a long time under the same suction force.

[0032] The brushless motor 3 of this utility model can adopt a 9-slot 6-pole structure to achieve built-in drive, resulting in small size, high suction power, high efficiency, long life and low temperature rise. The new brushless fan can integrate the installation structure of multiple existing sweeping machines and can be used directly as a replacement. Moreover, its suction power is higher than that of existing brushless fans, giving it a high degree of market competitiveness.

[0033] Furthermore: the brushless motor 3 includes a motor circuit board 3.1, a bearing housing 3.2, and a rolling bearing 3.3. The motor circuit board 3.1 is fixedly mounted on the upper shell 1.1, and the bearing housing 3.2 is fixedly mounted in the middle of the motor circuit board 3.1. The rotor 7 of the brushless motor 3 includes a circular cover 7.1 and a rotating shaft 7.2. The rotating shaft 7.2 is fixedly mounted at the center of the circular cover 7.1, and the middle part of the rotating shaft 7.2 is rotatably mounted in the bearing housing 3.2 through the rolling bearing 3.3. The lower end of the rotating shaft 7.2... The clearance fit is set into the shaft hole 5, and the center of the fan blade 2 is fixedly installed on the rotating shaft 7.2. When the brushless motor 3 is working, the circular cover 7.1 rotates outside the fan volute 1. Compared with the traditional brushless motor 3 directly using the circular cover 7.1 to drive the fan blade 2, this utility model uses the rotating shaft 7.2 fixed at the center of the circular cover 7.1 to drive the fan blade 2 to rotate, which can directly avoid air leakage in the middle hole, thereby effectively reducing the wind noise when the brushless fan is working, and can have greater suction power under the same power.

[0034] Furthermore: a coil winding is installed on the motor circuit board 3.1, and a magnetic ring is fixedly installed on the inner side of the circular cover 7.1. The circular cover 7.1 covers the coil winding, and the magnetic ring is located on the outer side of the coil winding. The working principle is the same as that of the existing brushless motor 3. The fixed coil winding is used to drive the circular cover 7.1 to rotate at high speed to achieve the brushless effect, thereby effectively improving the service life of the motor.

[0035] Furthermore, the top side of the upper shell 1.1 is formed with multiple arc-shaped heat sinks 8, which are spaced apart from each other. The arc-shaped heat sinks 8 can achieve rapid heat dissipation, thereby reducing the heat of the motor circuit board 3.1 during operation, making the motor operation more stable and less prone to overheating damage.

[0036] Furthermore, a lifting frame 9 is provided between the upper shell 1.1 and the motor circuit board 3.1. A positioning hole 10 is formed in the middle of the lifting frame 9. The bearing shaft is tightly fitted into the positioning hole 10. A limit ring 11 is formed on the outer side of the bottom end of the bearing seat 3.2. The limit ring 11 is located on the bottom side of the lifting frame 9. The lifting frame 9 can be used to lift the motor circuit board 3.1, so that its heat can be dissipated from the arc-shaped heat sink 8, thereby improving the heat dissipation efficiency.

[0037] Furthermore, a sealing gasket 12 is tightly fitted between the limiting ring 11 of the lifting frame 9 and the upper shell 1.1; air leakage can be prevented by using the sealing gasket 12, which has a better air leakage prevention effect and can ensure the stable operation of the fan blade 2.

[0038] Furthermore: a plurality of buckles 13 are formed on the upper edge of the lower shell 1.2, and a plurality of snap-fit ​​edges 14 are formed on the lower edge of the upper shell 1.1. The buckles 13 and snap-fit ​​edges 14 are arranged vertically and vertically to each other, and the snap-fit ​​edges 14 are snapped into the buckles 13 one by one; this facilitates the assembly of the fan blades 2 in the fan volute 1.

[0039] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A brushless structure for a high-efficiency main suction fan in a sweeper, comprising a fan housing, fan blades, and a brushless motor; characterized in that: The fan casing includes an upper casing and a lower casing. An air inlet is formed at the center of the lower casing, and a shaft hole is formed at the center of the upper casing. The fan blades are installed between the upper casing and the lower casing. Air outlets are formed on the outer sides of both the upper casing and the lower casing. The brushless motor is fixedly installed on the upper side of the upper shell. The brushless motor is equipped with a rotor. The rotor clearance of the brushless motor is set to fit into the shaft hole. The center of the fan blade is fixedly installed on the rotor of the brushless motor.

2. The brushless structure of a high-efficiency main suction fan for a sweeper according to claim 1, characterized in that: The brushless motor includes a motor circuit board, a bearing housing, and a rolling bearing. The motor circuit board is fixedly mounted on the upper shell, and the bearing housing is fixedly mounted in the middle of the motor circuit board. The rotor of the brushless motor includes a circular cover and a rotating shaft. The rotating shaft is fixedly mounted at the center of the circular cover, and the middle part of the rotating shaft is rotatably mounted in the bearing housing through the rolling bearing. The lower end of the rotating shaft is inserted into the shaft hole with clearance fit, and the center of the fan blade is fixedly mounted on the rotating shaft.

3. The brushless structure of a high-efficiency main suction fan for a sweeper according to claim 2, characterized in that: The motor circuit board is equipped with a coil winding. A magnetic ring is fixedly installed on the inside of the circular cover, which covers the coil winding. The magnetic ring is located on the outside of the coil winding.

4. The brushless structure of a high-efficiency main suction fan for a sweeper according to claim 2, characterized in that: The top side of the upper shell is formed with multiple arc-shaped heat sinks, which are spaced apart from each other.

5. The brushless structure of a high-efficiency main suction fan for a sweeper according to claim 4, characterized in that: A lifting frame is provided between the upper shell and the motor circuit board. A positioning hole is formed in the middle of the lifting frame. The bearing shaft is tightly fitted into the positioning hole. A limit ring is formed on the outer side of the bottom end of the bearing seat. The limit ring is set on the bottom side of the lifting frame.

6. The brushless structure of a high-efficiency main suction fan for a sweeper according to claim 5, characterized in that: A sealing gasket is tightly fitted between the limiting ring of the lifting frame and the upper shell.

7. The brushless structure of a high-efficiency main suction fan for a sweeper according to claim 1, characterized in that: The lower shell has several buckles formed on its upper edge, and the upper shell has several snap-fit ​​edges formed on its lower edge. The buckles and snap-fit ​​edges are arranged vertically and vertically to each other, and the snap-fit ​​edges are snapped into the buckles one by one.

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