Negative pressure fan based on high-speed brushless motor

Abstract

The negative pressure fan based on the high-speed brushless motor comprises a centrifugal impeller, a wind scooper and the high-speed brushless motor, the high-speed brushless motor is used for providing a high rotating speed, the centrifugal impeller and the wind scooper are matched to guide axial inlet air into radial outlet air, and under the driving of the high-speed brushless motor, the axial inlet air is guided into radial outlet air. The axial air inlet of the wind scooper has high negative pressure with one-way stability; according to the principle that the higher the air flow rate is, the lower the air pressure is, due to the fact that the axial air channel is communicated with the radial air outlet, when the high-speed brushless motor rotates continuously, the axial air channel in the heat dissipation shell will form the air flow continuously flowing towards the radial air outlet, and therefore the heat dissipation efficiency of the high-speed brushless motor is improved. And the airflow plays a role in cooling the high-speed brushless motor. The negative pressure fan is simple in structure, small in size and small in outer diameter, the suction force is higher by adopting the oblique flow type centrifugal impeller, and the requirement for a small-sized high-suction-force negative pressure fan is met.

Description

Technical Field

[0001] The utility model relates to the field of negative pressure fans, in particular to a negative pressure fan based on a high-speed brushless motor. Background Art

[0002] In some applications requiring a miniaturized negative pressure fan, such as small vacuum cleaners, robot vacuums, and portable irons, space constraints necessitate a smaller diameter negative pressure fan, resulting in weaker suction. Alternatively, miniaturization or structural improvements may require reducing the diameter of existing negative pressure fans while maintaining the same suction. However, this reduction in diameter can affect speed and heat dissipation.

[0003] In view of this, this application is filed. Utility Model Content

[0004] The utility model provides a negative pressure fan based on a high-speed brushless motor to solve at least one of the above technical problems.

[0005] To solve the above problems, as one aspect of the utility model, a negative pressure fan based on a high-speed brushless motor includes a centrifugal impeller, including a substrate, and guide blades arranged on the substrate for using centrifugal force to guide axial air intake to radial air outlet; an air guide cover, which is sleeved on the centrifugal impeller and has an axial air inlet, and is adapted to have a radial air outlet at the radial air outlet position of the centrifugal impeller; a high-speed brushless motor, including a heat dissipation shell, and a brushless motor body located in the heat dissipation shell, the output shaft of the brushless motor body is connected to the substrate, the guide blades are located on the side away from the high-speed brushless motor, the heat dissipation shell is connected to the air guide cover, and an axial air duct passing through the brushless motor body is provided in the heat dissipation shell, and the axial air duct is communicated with the radial air outlet.

[0006] Preferably, the centrifugal impeller is a diagonal flow centrifugal impeller, and the diameter of the centrifugal impeller is substantially the same as the outer diameter of the heat dissipation housing.

[0007] Preferably, the base plate is convex from the periphery to the middle portion toward the axial direction of the air inlet, and the guide blade is twisted from the air inlet end to the air outlet end.

[0008] Preferably, the upper edge of the guide blade has at least one height decreasing section from the air inlet end to the air outlet end in the shape of a blade with decreasing height, the wind guide cover is provided with an arc-shaped turning section adapted to the height decreasing section, and the radial air outlet is provided with an air guide surface in roughly the same direction as the radial air outlet.

[0009] Preferably, the heat dissipation housing and the substrate are spaced apart, and the gap is 0.5-5 mm.

[0010] Preferably, the axial air duct is formed by a plurality of air guide plates in the heat dissipation housing, and the brushless motor body is supported by the plurality of air guide plates in the middle of the heat dissipation housing.

[0011] Preferably, the brushless motor body includes a stator mechanism, a rotor mechanism, a semicircular machine cover and a concave motor bracket, the stator mechanism and the rotor mechanism are installed in the concave motor bracket, the concave motor bracket and the semicircular machine cover form a cylindrical structure, and ventilation holes are provided at both ends of the cylindrical structure.

[0012] Preferably, the heat dissipation housing, the air guide plate, the semicircular cover and the concave motor bracket are all made of metal.

[0013] Preferably, one end of the air guide cover away from the axial air inlet is fixedly sleeved on the outside of the heat dissipation shell, and the radial air outlet extends to the position of the heat dissipation shell.

[0014] Preferably, a plurality of heat dissipation gaps corresponding to the positions of the heat dissipation shell are arranged at intervals along the circumferential direction on the inner side of the air guide cover, and the heat dissipation gaps and the heat dissipation shell form a heat dissipation channel, and the heat dissipation gaps are connected to the radial air outlet.

[0015] In response to the miniaturization and high negative pressure requirements of negative pressure fans, the utility model has developed a negative pressure fan based on a high-speed brushless motor. The high-speed brushless motor is used to provide a high speed, and the centrifugal impeller and the air guide cover cooperate to guide the axial air inlet to the radial air outlet. Driven by the high-speed brushless motor at tens of thousands of revolutions per minute, the axial air inlet of the air guide cover has a high negative pressure with unidirectional stability; and the high negative pressure forms a huge high-speed airflow at the radial air outlet. According to the principle that the higher the gas flow rate, the lower the air pressure, since the axial air duct is connected to the radial air outlet, when the high-speed brushless motor continues to rotate, the axial air duct in the heat dissipation housing will form an airflow that continuously flows toward the radial air outlet, and this airflow has the effect of dissipating heat for the high-speed brushless motor.

[0016] Furthermore, the negative pressure fan has a simple structure and adopts a diagonal flow centrifugal impeller to make the suction stronger. The diameter of the centrifugal impeller is set to be roughly the same as the outer diameter of the heat dissipation shell, thereby further miniaturizing the outer diameter of the entire negative pressure fan and meeting the scenario that requires a miniaturized negative pressure fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a negative pressure fan based on a high-speed brushless motor according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the explosion structure;

[0019] Figure 3 yes Figure 1Schematic diagram of the vertical section structure;

[0020] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at AA;

[0021] Figure 5 yes Figure 1 A schematic diagram of the structure of the hidden air guide cover;

[0022] Figure 6 yes Figure 1 A schematic structural diagram of a hidden heat dissipation housing;

[0023] Figure 7 yes Figure 1 Schematic diagram of the structure of the centrifugal impeller;

[0024] Figure 8 yes Figure 1 Schematic diagram of the structure of the air guide cover.

[0025] Reference numerals:

[0026] 1. Centrifugal impeller; 11. Base plate; 12. Guide vanes; 2. Air guide hood; 21. Axial air inlet; 22. Radial air outlet; 221. Air guide surface; 23. Arc-shaped turning section; 24. Heat dissipation gap; 3. High-speed brushless motor; 31. Heat dissipation housing; 311. Air guide plate; 32. Brushless motor body; 321. Output shaft. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. 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 utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] In the description of the utility model, it is understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] The specific embodiments of the utility model will be described in detail below in combination with the drawings.

[0030] Please refer to Figures 1 to 8 A negative pressure fan based on a high-speed brushless motor 3, comprising, centrifugal impeller 1, air deflector 2 and high-speed brushless motor 3.

[0031] Centrifugal impeller 1 includes base plate 11 and guide vane 12 arranged on base plate 11 to guide axial air inlet to radial air outlet by centrifugal force, guide vane 12 is arranged on one side surface of base plate 11, and the base plate 11 is circular.

[0032] Air deflector 2 is sleeved on the centrifugal impeller 1 and is provided with axial air inlet 21, and is provided with radial air outlet 22 matched with the radial air outlet position of the centrifugal impeller 1; the radial air outlet 22 has a plurality of and is arranged at intervals.

[0033] High-speed brushless motor 3, including heat dissipation shell 31 and brushless motor body 32 in heat dissipation shell 31, the output shaft 321 of the brushless motor body 32 is connected with the base plate 11, the guide vane 12 is located away from the high-speed brushless motor 3 side, the heat dissipation shell 31 is connected with the air deflector 2, the axial air duct through the brushless motor body 32 is arranged in the heat dissipation shell 31, and the axial air duct is communicated with the radial air outlet 22.

[0034] The maximum speed of high-speed brushless motor 3 can reach tens of thousands of revolutions per minute, and the conventional state can be maintained at tens of thousands of revolutions per minute, under the driving of high-speed brushless motor 3 tens of thousands of revolutions per minute, please refer to Figure 3The gas flow direction indicated by the small arrow is a high negative pressure with unidirectional stability at the axial air inlet 21 of the air guide cover 2; and the high negative pressure forms a huge high-speed airflow at the radial air outlet 22. According to the principle that the higher the gas flow rate, the lower the air pressure, since the axial air duct is connected to the radial air outlet 22, when the high-speed brushless motor 3 continues to rotate, the axial air duct in the heat dissipation housing 31 will form an airflow that continuously flows toward the radial air outlet 22 under the push of the normal atmospheric pressure at the other end, and this airflow has the effect of dissipating heat for the high-speed brushless motor 3.

[0035] Furthermore, the centrifugal impeller 1 is a diagonal flow centrifugal impeller 1, and its diameter is substantially the same as the outer diameter of the heat dissipation housing 31. This negative pressure fan has a simple structure, and the use of the diagonal flow centrifugal impeller 1 provides stronger suction. Setting the diameter of the centrifugal impeller 1 to be substantially the same as the outer diameter of the heat dissipation housing 31 further miniaturizes the outer diameter of the entire negative pressure fan, meeting the needs of scenarios requiring a miniaturized negative pressure fan.

[0036] Preferably, the base plate 11 of the diagonal flow centrifugal impeller 1 protrudes from the periphery to the middle toward the axial air inlet 21, and the guide blades 12 are twisted from the air inlet end to the air outlet end, thereby forming a rotating wind when rotating at high speed, obtaining a greater centrifugal driving force on the gas.

[0037] Among them, the upper edge of the guide blade 12 has at least one height decreasing section from the air inlet end to the air outlet end, and the air guide cover 2 is provided with an arc-shaped turning section 23 adapted to the height decreasing section, so that the gas enters from the axial air inlet 21 and accelerates to flow along the radial direction in the channel formed by multiple guide blades 12. With the cooperation of the arc-shaped turning section 23 of the air guide cover 2, the turning is smoother and the loss of dynamic pressure is reduced, so that the negative pressure efficiency is higher. Among them, under the condition that the diameter of the negative pressure fan is 32.5mm, the fully closed pressure can reach 8.0Kpa; in other embodiments, the diameter range of the negative pressure fan is 25~40mm.

[0038] Please refer to Figure 4 and Figure 8 The radial air outlet 22 is provided with an air guide surface 221 in a direction roughly the same as the radial air outlet, so that the rotating wind can maintain the highest speed and flow out along the air guide surface 221, ensuring the high-speed flow of gas in the radial air outlet 22, thereby forming a negative pressure suction force facing the axial air duct in the heat dissipation shell 31, thereby achieving the effect of heat dissipation for the brushless motor body 32.

[0039] Preferably, the number of the guide blades 12 is 6 to 9, and the number of the radial air outlets 22 is 12 to 18 along the circumference of the air guide cover 2. In this embodiment, the number of the guide blades 12 is 7, and the number of the radial air outlets 22 is 14 along the circumference of the air guide cover 2.

[0040] In order to ensure better gas flow in the axial air duct when the centrifugal impeller 1 rotates, it is necessary to optimize the connection between the axial air duct and the radial air outlet 22. In this embodiment, the heat dissipation shell 31 and the substrate 11 are spaced apart, and the preferred gap is 0.5 to 5 mm. Within this gap range, the gas flow driven by the air pressure difference can be fully utilized for heat dissipation.

[0041] In other embodiments, the heat dissipation housing 31 may be provided with a ventilation gap relative to the radial air outlet 22 , so that the axial air duct is connected to the radial air outlet 22 .

[0042] In other embodiments, the axial air duct may be a heat dissipation housing that fixes the motor body through a rod-shaped structure, a block-shaped structure, or other structures, so as not to block the axial flow of gas.

[0043] In this embodiment, the axial air duct is formed by a plurality of air guide plates 311 spaced apart within the heat dissipation housing 31. The brushless motor body 32 is supported by the plurality of air guide plates 311 in the middle of the heat dissipation housing 31. Furthermore, the air guide plates 311 can be tilted in the circumferential direction, with the tilt direction being aligned with the air guide surface 221 of the radial air outlet 22.

[0044] The brushless motor body 32 can have various structures. To further enhance heat dissipation, in this embodiment, the brushless motor body 32 includes a stator mechanism, a rotor mechanism, a semicircular cover, and a concave motor bracket. The stator and rotor mechanisms are mounted within the concave motor bracket. The concave motor bracket and the semicircular cover form a cylindrical structure with ventilation openings at both ends. For more details, please refer to Chinese Patent Publication No. CN218586993U, which describes the structure of a high-speed hair dryer motor.

[0045] The heat dissipation housing 31, the air guide plate 311, the semicircular cover and the concave motor bracket are all made of metal, which can improve the heat dissipation effect. The metal material can be aluminum alloy, or aluminum, copper, copper alloy and other metals with good heat dissipation effect.

[0046] Please refer to Figure 1 and Figure 2 The end of the air guide 2, away from the axial air inlet 21, is fixedly mounted on the outside of the heat dissipation housing 31. This connection structure is simple and easy to assemble. Furthermore, the radial air outlet 22 extends to the heat dissipation housing 31, allowing the axial air duct to communicate directly with the radial air outlet 22 through the gap between the heat dissipation housing and the base plate 11, reducing air flow obstruction and improving heat dissipation.

[0047] For further information, please refer to Figure 1 and Figure 8The inner side of the wind scooper 2 is provided with a plurality of heat dissipation gaps 24 corresponding to the positions of the heat dissipation shells 31 in the circumferential direction, and the heat dissipation gaps 24 and the heat dissipation shells 31 form a heat dissipation channel, and the heat dissipation gaps 24 are communicated with the radial air outlets 22. The heat dissipation gaps 24 can effectively improve the heat dissipation effect of the heat dissipation shells 31. The principle is that the radial air outlet 22 position has high-speed airflow with low air pressure, and the other end of the heat dissipation gap 24 is atmospheric pressure. Therefore, the heat dissipation channel forms an airflow flowing towards the radial air outlet 22 under the action of atmospheric pressure, thereby improving the heat dissipation effect of the heat dissipation shells 31.

[0048] Further, in other embodiments, the substrate 11 is provided with a centrifugal flow guide groove or a centrifugal flow guide convex strip on the side surface close to the heat dissipation shells 31. The average height of the guide vane 12 is defined as H, and the height of the centrifugal flow guide groove or the centrifugal flow guide convex strip is 1 / 20H-1 / 10H. The centrifugal flow guide groove or the centrifugal flow guide convex strip can have the same effect as the guide vane 12, that is, using centrifugal force to guide the axial air flow to the radial air outlet. However, since the height of the centrifugal flow guide groove or the centrifugal flow guide convex strip is much smaller than that of the guide vane 12, the energy consumption of the centrifugal flow guide groove or the centrifugal flow guide convex strip is much smaller than that of the guide vane 12. However, the centrifugal flow guide groove or the centrifugal flow guide convex strip can provide sufficient negative pressure suction to suck air from the other end of the axial air duct at high speed, thereby improving the heat dissipation effect on the brushless motor body 32.

[0049] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the idea of the present application belongs to the protection scope of the present application.

Claims

1. A negative pressure fan based on a high-speed brushless motor, characterized in that: include, The centrifugal impeller comprises a base plate and guide blades arranged on the base plate for guiding the axial air inlet to the radial air outlet by utilizing the centrifugal force; An air guide cover is sleeved on the centrifugal impeller and is provided with an axial air inlet, and is adapted to be provided with a radial air outlet at a radial air outlet position of the centrifugal impeller; A high-speed brushless motor includes a heat dissipation housing and a brushless motor body located within the heat dissipation housing, wherein the output shaft of the brushless motor body is connected to the substrate, the guide blades are located on a side away from the high-speed brushless motor, the heat dissipation housing is connected to the air guide cover, and an axial air duct passing through the brushless motor body is provided within the heat dissipation housing, and the axial air duct is connected to the radial air outlet.

2. The negative pressure fan based on a high-speed brushless motor according to claim 1, characterized in that: The centrifugal impeller is a diagonal flow centrifugal impeller, and the diameter of the centrifugal impeller is substantially the same as the outer diameter of the heat dissipation housing.

3. The negative pressure fan based on a high-speed brushless motor according to claim 2, characterized in that: The base plate is convex from the periphery to the middle portion toward the axial direction of the air inlet, and the guide blade is twisted from the air inlet end to the air outlet end.

4. The negative pressure fan based on a high-speed brushless motor according to claim 3, characterized in that: The upper edge of the guide blade has at least one height decreasing section from the air inlet end to the air outlet end, in the shape of a blade with decreasing height. The wind guide cover is provided with an arc-shaped turning section adapted to the height decreasing section, and the radial air outlet is provided with an air guide surface in roughly the same direction as the radial air outlet.

5. The negative pressure fan based on a high-speed brushless motor according to claim 1, characterized in that: The heat dissipation housing and the substrate are spaced apart, and the space is 0.5-5 mm.

6. The negative pressure fan based on a high-speed brushless motor according to claim 5, characterized in that: The axial air duct is formed by a plurality of air guide plates in the heat dissipation housing, and the brushless motor body is supported by the plurality of air guide plates in the middle of the heat dissipation housing.

7. The negative pressure fan based on a high-speed brushless motor according to claim 6, characterized in that: The brushless motor body includes a stator mechanism, a rotor mechanism, a semicircular machine cover and a concave motor bracket. The stator mechanism and the rotor mechanism are installed in the concave motor bracket. The concave motor bracket and the semicircular machine cover form a cylindrical structure. Ventilation holes are provided at both ends of the cylindrical structure.

8. The negative pressure fan based on a high-speed brushless motor according to claim 7, characterized in that: The heat dissipation housing, the air guide plate, the semicircular machine cover and the concave motor bracket are all made of metal.

9. The negative pressure blower based on a high-speed brushless motor according to claim 5, characterized in that: One end of the air guide cover away from the axial air inlet is fixedly sleeved on the outside of the heat dissipation shell, and the radial air outlet extends to the position of the heat dissipation shell.

10. The negative pressure fan based on a high-speed brushless motor according to claim 9, characterized in that: A plurality of heat dissipation gaps corresponding to the positions of the heat dissipation shell are arranged at intervals along the circumferential direction on the inner side of the air guide cover, and the heat dissipation gaps and the heat dissipation shell form a heat dissipation channel, and the heat dissipation gaps are connected to the radial air outlet.

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