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KR-102962563-B1 - Axial Type Fan

KR102962563B1KR 102962563 B1KR102962563 B1KR 102962563B1KR-102962563-B1

Abstract

The present invention relates to an axial-flow fan in which the impeller and rotor are integrally formed using a plastic magnet, and the back yoke can be omitted by magnetizing only the desired inner portion to form an N/S magnet. A fan according to the present invention comprises: a fan housing having a cylindrical inner circumference; a base having a bearing housing integrally formed and protruding from the central portion of the fan housing; a sleeve bearing inserted into the bearing housing; a rotating shaft whose lower portion is rotatably supported by the sleeve bearing; a rotor fixed to the upper portion of the rotating shaft; a stator whose inner circumference is coupled to the outer circumference of the bearing housing and is positioned with a certain gap from the rotor; and an impeller integrally formed on the outer circumference of the rotor and rotating together with it; wherein the rotor and the impeller are integrally formed using a plastic magnet, and the N-pole and S-pole magnets of the rotor are formed by splitting and magnetizing only the inner portion of the integral plastic magnet.

Inventors

  • 김병수

Assignees

  • 주식회사 아모텍

Dates

Publication Date
20260508
Application Date
20230510

Claims (11)

  1. Fan housing having a cylindrical inner section; A base integrally formed with a bearing housing protruding from the central portion and connected through a plurality of bridges from the rear surface of the fan housing; Sleeve bearing inserted into the bearing housing above; A rotating shaft whose lower part is rotatably supported by the sleeve bearing; A rotor fixed to the upper part of the above-mentioned rotation axis; A stator having a bobbin that surrounds a stator core, which is fixed on the base above and whose inner circumference is coupled to the outer circumference of the bearing housing, and which is composed of a plurality of teeth and an annular back yoke; and It includes an impeller integrally formed on the outer circumference of the rotor and rotating together with it; On the outer side of the above-mentioned annular back yoke, a first circular projection with a through hole is formed protruding, and On the outer side of the above bobbin, a plurality of second circular protrusions, each having a through hole, are formed protrudingly. A plurality of connecting protrusions are formed protruding from the bearing housing to fix the stator, and One of the plurality of connecting protrusions passes through the through hole of the first circular protrusion, and the remainder of the plurality of connecting protrusions passes through the through hole of the plurality of second circular protrusions, so that the tip of the plurality of connecting protrusions protrudes to the upper part of the bobbin. A fan in which the rotor and impeller are integrally formed using a plastic magnet, and the N-pole and S-pole magnets of the rotor are formed by splitting and magnetizing only the inner portion of the integral plastic magnet.
  2. In paragraph 1, A fan that sets the thickness of the split magnetized magnet to be 2.0t or more.
  3. In paragraph 2, The above-described split magnet acts as a polar anisotropic magnet that does not require a back yoke of the rotor.
  4. In paragraph 1, The above rotor A magnet having a structure in which N poles and S poles are alternately divided and magnetized, arranged at a certain gap on the outer surface of the stator; and A rotor support formed integrally with the magnet and impeller; comprising The above rotor support A disc portion formed in the shape of a disc, with a shaft support portion extending vertically in the center to support the rotation axis; and A fan comprising: a cylindrical portion extending vertically from the edge of the above-mentioned disc portion, having the magnet disposed on its inner surface and a plurality of blades of the impeller formed radially on its outer surface.
  5. In paragraph 4, The above-mentioned rotating shaft has its upper end supported by the shaft support of the rotor support and its lower end inserted into and supported by the sleeve bearing, and is provided with an anti-detachment groove formed in the middle between the upper end and the lower end. A fan further comprising a stopper washer in which the inner portion is close to the anti-detachment groove of the rotation shaft to block the rotation shaft from detaching due to lift force.
  6. In paragraph 1, The above stator is provided with a bobbin that is formed with a bobbin extension located on the upper surface surrounding the teeth and annular back yoke of the stator core and extending into the interior of the bearing housing. A fan further comprising a stopper washer, the outer circumference of which is disposed between the bobbin extension and the first stepped portion at the top of the bearing housing, and the inner circumference of which is close to the anti-detachment groove of the rotational shaft to block the rotational shaft from detaching due to lifting force.
  7. delete
  8. In paragraph 1, The sleeve bearing above A main body formed in the shape of a rod, wherein the outer periphery is press-fitted to the inner periphery of the groove of the bearing housing, and a circular groove is formed in the central part from the top to the middle part into which the rotation shaft is inserted; A middle section having an outer diameter smaller than that of the main body through an inclined portion on the lower side of the main body; and It includes a lower portion extended below the above-mentioned middle portion; and A fan in which the bottom portion of the circular groove contacted by the lower portion of the above-mentioned rotating shaft is blocked.
  9. In paragraph 1, The above sleeve bearing has a non-penetrating structure in which the lower end of the rotating shaft is supported at the bottom of the groove, and The outer periphery of the upper and middle portions of the sleeve bearing is press-fitted into the inner periphery of the trench-shaped groove of a bearing housing having a cross-section formed as a trench-shaped groove, and the lower portion of the sleeve bearing has an outer periphery with a smaller diameter than that of the upper and middle portions.
  10. delete
  11. In paragraph 1, The first and second circular protrusions are both positioned between the teeth of the stator core, and the through holes of the first and second circular protrusions serve to support the plurality of connecting protrusions.

Description

Axial Type Fan The present invention relates to an axial-flow fan, and more specifically, to an axial-flow fan in which the entire impeller and the magnet portion are integrally formed using a plastic magnet, and only the shaft is insert-molded and injection-molded, and then only the desired inner portion is magnetized to form an N/S magnet, thereby allowing the back yoke to be omitted. Currently, to create a comfortable environment inside a vehicle, the vehicle's air conditioning system measures indoor temperature, humidity, and fine dust, then performs heating and cooling based on temperature and humidity data, and operates electrostatic precipitator filters based on fine dust data. One method of checking indoor temperature and humidity is to use a motor equipped in an in-car sensor to draw in indoor air and create a forced airflow to measure temperature and humidity, thereby checking the environmental conditions inside the vehicle. In addition, with the recent increase in interest regarding fine dust, indoor conditions are checked by measuring the concentration of fine dust. Fine dust measurement is also performed using a method that draws in indoor air using a motor equipped in the fine dust sensor. In-Car sensors and fine dust sensors are also installed on the grille or instrument panel of a vehicle, and detect the temperature and concentration (or amount of fine dust) of the indoor air by drawing in indoor air using an aspirator method. In this case, the fine dust sensor can measure the amount of fine dust by irradiating the inhaled indoor air with a predetermined light and measuring the amount of light scattered by the fine dust in the air. Conventional blower fans (i.e., aspiration motors) installed in the air passage to draw in indoor air of a vehicle are small and do not require precise and complex speed control, so single-phase motors using a single coil are used, which have a simple structure. The above-mentioned blower fan is an axial-flow type fan that draws in external air from an air intake on one side of the housing and discharges it along the axial direction to an air outlet on the other side, and can be installed in the flow path of the housing. In addition, cooling fans used to prevent overheating of electronic components are also axial-flow type fans. In conventional axial-flow fan motors, a brass bushing serving as a bearing housing is formed in the center by insert injection molding within a resin housing, and a sleeve bearing is inserted into the bushing to rotatably support the rotor's rotation axis. Additionally, a support sheet is inserted into the lower part of the bearing housing to reduce rotational resistance of the rotating shaft, and the housing is impregnated with oil. In this case, as the temperature rises due to the rotation of the rotor, the air and oil inside the bearing housing expand in volume due to thermal expansion, causing the oil to rise along the rotating shaft and scatter. In this situation, if a metal bearing housing is press-fitted into a resin housing, the heat dissipation is poor, making it prone to oil scattering if the temperature rises significantly. Furthermore, conventionally, when using a through-type sleeve bearing, a support seat is inserted into the lower part of the bearing housing to reduce rotational resistance of the rotating shaft extending below the sleeve bearing. However, during the manufacturing process, the support seat is often omitted and cannot be placed in a predetermined position, causing various problems, and there is also a problem of reduced durability due to wear of the support seat. In addition, conventional aspiration motors have a problem in which the rotating shaft detaches due to lift force when the rotor (impeller) rotates, and to prevent this, a structure is adopted in which a slit washer is coupled to a groove formed at the bottom of the rotating shaft. However, in this case, when the rotating shaft rises due to lift force when the rotor (impeller) rotates, the slit washer comes into contact with the sleeve bearing, causing a problem of noise. Furthermore, conventional fan motors can configure the rotor by attaching a magnet to the impeller using adhesive along with the back yoke, or by insert molding the magnet and back yoke during impeller injection. The aforementioned insert molding type and bond assembly method result in increased unit costs and, due to the existence of assembly tolerances, cause problems that negatively affect balance; therefore, balance correction is performed by inserting balance correction chips or other weights. In addition, conventional fan motors have a problem of reduced productivity because bonding and caulking operations on the contact surface between the stator and the bushing are essential to prevent the stator from detaching or rotating when assembling the stator to the bushing. FIGS. 1a and FIGS. 1b are a perspective view and a bottom view, respectively, showing an axial flow fan accordi