• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Ventilation system for an electric motor, with a fan wheel (16) driven by the motor (10) and a hood (18) provided with a ventilation opening (28), which surrounds the fan wheel (16) on its circumference at a radial distance and is designed for this purpose, directing the air to parts (12) of the motor (10) to be cooled, characterized in that the hood (18) has an inner part (38) surrounding the fan wheel (16), which is at a radial distance from the outer peripheral wall (20) of the Hood (18) is arranged.
    公开号:CH716086A2
    申请号:CH00394/20
    申请日:2020-04-02
    公开日:2020-10-15
    发明作者:Dirk Wenderott Dr；Lempke Magnus
    申请人:Brinkmann Pumpen K H Brinkmann Gmbh & Co Kg；
    IPC主号:
    专利说明:

    The invention relates to a ventilation system for an electric motor, with a fan wheel driven by the motor and a hood provided with a ventilation opening which surrounds the fan wheel on its circumference at a radial distance and is designed to convey the air to parts of the motor to be cooled to steer.
    Ventilation systems of this type are used, for example, in electric motors for pumps, for example for cooling lubricant pumps for machine tools. The electric motor and the pump are mostly integrated in a common, essentially cylindrical housing which is provided with cooling fins on its outer circumference. The fan wheel is arranged outside this housing, and the hood is held at one end of the housing in such a way that it surrounds the fan wheel and forms a protection against contact for the fan wheel. At the same time, the hood serves to deflect the air, which is conveyed essentially radially outward by the fan wheel, in such a way that it flows in an essentially axial direction over the cooling fins.
    Typically, the hood has a cylindrical peripheral wall which is closed at one end by a circular end wall, the transition between the end wall and the peripheral wall being rounded. One or more ventilation openings are formed in the end wall. The ambient air is drawn in essentially axially through these ventilation openings and then conveyed radially outward by the fan wheel and deflected again in the axial direction on the inner surface of the rounded hood.
    The object of the invention is to create a ventilation system that has improved air flow and cooling properties at a given speed of the fan wheel.
    This object is achieved according to the invention in that the hood has an inner part which surrounds the fan wheel and which is arranged at a radial distance from the outer circumferential wall of the hood.
    It has been shown that the flow resistance and the noise can be reduced if the outer diameter of the fan wheel is reduced compared to conventional designs and the hood forms a more streamlined guide contour on which the air is deflected in the axial direction. In the case of conventional, single-shell hoods, however, this would mean that the end wall would also have a smaller outer diameter.
    The electric motors or pumps with an integrated electric motor are, however, often placed on a flat storage surface before the final installation or during maintenance or repair work that the hood faces downwards and the flat, circular end wall of the hood as a base for the entire motor and pump housing is used. If the outer diameter of the hood were to be reduced in the area of the end wall, this would result in reduced stability of the pump and motor housing. According to the invention, this problem is solved in that the guide contour of the hood is not formed by its outer wall, but by a specially shaped inner part of the hood. In this way, the aerodynamics of the ventilation system is improved while the outer shape of the hood is unchanged and the stability is accordingly good.
    [0008] Advantageous refinements are given in the subclaims.
    In an advantageous embodiment, the inner part of the hood has an approximately bell-shaped shape, with a substantially cylindrical upper end portion which at the same time forms the end wall of the hood with the ventilation openings, and a lower portion which continuously adjoins the cylindrical portion and its diameter increases downwards (towards the motor housing). The blades of the fan wheel can be adapted to the inner contour of this inner part in such a way that only a relatively narrow radial gap remains between these blades and the inner surface of the inner part.
    For example, the fan wheel can have a ring of essentially axially oriented blades which are inclined to the radial direction of the fan wheel and / or are curved in the radial direction and whose height decreases radially from the inside to the outside.
    In the following, an embodiment is explained in more detail with reference to the drawing.
    The single figure shows an axial section through an inventive ventilation system of an electric motor.
    In the drawing, the upper part of a housing of an electric motor 10 is shown in an external view, which has a substantially cylindrical shape and is, for example, part of an integrated unit from the electric motor and a pump. The suction port of the pump is then at the opposite end of the housing. The housing of the motor 10 is equipped with radially projecting cooling fins 12 on most of its cylindrical peripheral wall. A motor shaft 14 mounted coaxially in the housing is led upward out of the housing and carries a fan wheel 16 of a ventilation system for cooling the motor outside the housing.
    The fan wheel 16 is received in a downwardly open hood 18 which has a cylindrical circumferential wall 20 and at the upper end a flat end wall 22 which is circular in plan. The upper end of the cylindrical peripheral wall 20 merges into the end wall 22 via a rounding 24.
    The housing of the motor 10 has on its outer circumference, approximately at the level of the upper ends of the cooling fins 12, radially projecting brackets 26 which form a seat for the lower edge of the hood 18. For example, screws (not shown) that are screwed radially into the brackets 26 can be fastened to the motor 10 in the hood.
    In the end wall 22 of the hood 18, a ventilation opening 28 is formed concentrically with the fan wheel 16, which in the example shown tapers slightly inward and is divided into several concentric annular slots 34 by several concentric ring walls 32 connected to one another by radial webs 30, the width of which is so small that effective protection against contact is created.
    On the circumferential edge of the ventilation opening 28, a rotationally symmetrical, approximately bell-shaped inner part 38 is fastened on the inside with the help of screws 36, the inner surface of which forms a streamlined guide contour 40 for the air flowing from the fan wheel 16 below the ventilation opening 28. The outer surface of the inner part 38 is surrounded by the peripheral wall 20 and the rounding 24 of the hood 18 at a radial distance. An upper end section 42 of the inner part 38 is slightly conical, corresponding to the tapering of the ventilation opening 28, and is formed in one piece with the webs 30 and the annular walls 32 held thereon. The section 42 merges downward with decreasing wall thickness into an approximately conical section 44, which widens downward so that its distance from the cylindrical peripheral wall of the hood 20 decreases, while its radial distance from the outer periphery of the fan wheel 16 increases. The guide contour 40 is curved slightly concave in the lower part so that the air is deflected in a predominantly axial direction. In this way, the air conveyed radially outward by the fan wheel 16 is directed largely without turbulence into an annular gap between the peripheral wall 20 of the hood and the rounded upper end of the motor 10, the gap at the lower end opening into the spaces between the cooling fins 12.
    In the example shown, the fan wheel 16 has a circular disk 46 which is seated in a rotationally fixed manner on the motor shaft 14 and which is slightly below the lower edge of the inner part 38 in height and with a ring of vertically (axially) protruding blades 48 on the top is equipped. The blades 48 are inclined to the radial direction of the fan wheel and are curved in the radial direction so that the air is displaced radially outward (radial fan wheel). The height of the vanes 48 decreases from the radially inner end to the radially outer end, so that the contour of the vanes at least in the upper part of the fan wheel is approximately adapted to the course of the guide contour 40 and the sloping edges of the vanes each have only a narrow gap with the inner surface of the inner part 38. The centrifugal effect of the vanes 48 creates a negative pressure in the radially inner area of the fan wheel, so that ambient air is sucked in via the ventilation opening 28 and then passed onto the cooling fins 12 with little flow resistance.
    The hood 18 forms radially outside of the inner part 38 and thus also outside the ventilation opening 28 a circumferential bead 50, the upper apex of which is at least at the level of the heads of the screws 36, so that a flat standing surface is defined that allows that Place complete pump and motor housings in an inverted position on a flat support surface, whereby the large diameter of the base (defined by the diameter of the bead 50) ensures a high level of stability.
    权利要求:
    Claims (9)
    [1]
    1. Ventilation system for an electric motor, with a fan wheel (16) driven by the motor (10) and a hood (18) provided with a ventilation opening (28) which surrounds the fan wheel (16) on its circumference at a radial distance and is designed for this purpose is to direct the air to parts (12) of the motor (10) to be cooled, characterized in that the hood (18) has an inner part (38) which surrounds the fan wheel (16) and which is at a radial distance from the outer peripheral wall (20) the hood (18) is arranged.
    [2]
    2. Ventilation system according to claim 1, in which the inner part (38) forms a bell-shaped guide contour (40) which widens in the axial direction towards the motor (10) for the air flowing out of the fan wheel (16).
    [3]
    3. Ventilation system according to claim 2, in which the fan wheel has a ring of blades (48), the contour of which is adapted to the course of the guide contour (40).
    [4]
    4. Ventilation system according to one of the preceding claims, in which the fan wheel has a circular disc (46) from which the blades (48) project in the axial direction towards the ventilation opening (28).
    [5]
    5. Ventilation system according to one of the preceding claims, in which the inner part (38) is releasably attached to an end wall (22) of the hood (18).
    [6]
    6. Ventilation system according to claim 5, in which the hood (18) has a circumferential convex bead (50) on the peripheral edge of its end wall (22).
    [7]
    7. Ventilation system according to one of the preceding claims, in which the inner part (38) is formed in one piece with a lattice structure (30, 32) which extends over the ventilation opening (28).
    [8]
    8. Electric motor with a ventilation system according to one of the preceding claims.
    [9]
    9. Integrated motor and pump unit with an electric motor according to claim 8.
    类似技术:
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    WO2008101577A2|2008-08-28|Ventilator wheel, system and transmission line
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    DE102013222207B4|2022-03-03|centrifugal fan
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    DE872816C|1953-04-09|Hub for screw fan wheel
    DE1604224B2|1971-12-02|ROOM HUMIDIFICATION DEVICE
    DE102012100464A1|2012-07-26|ventilation arrangement
    DE2836525C2|1982-06-09|Sickle lawn mower
    EP0404722B1|1992-12-23|Air humidifier
    DE19839729A1|1999-12-02|Fan especially for ventilation, heating or air-conditioning installation in cars
    DE10030671B4|2013-11-28|Radial fan installation
    EP1369595B1|2006-07-12|Stator for fans, particularly for air coolers
    DE102005027460B4|2013-07-11|Heat dissipating device
    同族专利:
    公开号 | 公开日
    FR3094852A1|2020-10-09|
    DE102020108371A1|2020-10-08|
    DE202019101969U1|2020-07-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE8623819U1|1986-09-05|1987-03-19|Audi Ag, 8070 Ingolstadt, De|
    DE4335686B4|1993-10-20|2006-07-27|Robert Bosch Gmbh|fan|
    US7883312B2|2005-03-31|2011-02-08|Mitsubishi Heavy Industries, Ltd.|Centrifugal blower|
    JP6551173B2|2015-11-09|2019-07-31|株式会社デンソー|Centrifugal blower|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE202019101969.7U|DE202019101969U1|2019-04-05|2019-04-05|Ventilation system for an electric motor|
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