JP2014070497A - Ring fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring fan capable of effectively avoiding biting of foreign matters at a ring part.SOLUTION: A ring fan 3 rotatably arranged on an inner periphery of a shroud 2 via an annular chip clearance C comprises: plural blades 32 radially extending from a boss part 33 rotating around a center shaft 3a; a ring part 31 coupling tips of the plural blades 32; and plural rib-like protrusion parts 35 for exhausting foreign matters provided on an outer periphery faced to the chip clearance C of the ring part 31. The plural protrusion parts 35 are spaced in a circumferential direction at a posture inclined to the center shaft 3a.

Description

  The present invention relates to a fan for cooling a radiator or the like mounted on an automobile.

  Conventionally, various ring fans that are rotatably arranged through a tip clearance that is a ring-shaped gap around the inner periphery of the shroud have been proposed for the purpose of cooling refrigerants of radiators and air conditioners mounted on automobiles. (For example, refer to Patent Document 1). Such a ring fan includes a plurality of blades radially extending from a boss portion that rotates around a central axis, and a ring portion that connects the tips of the plurality of blades. A constant chip clearance is always formed between the ring portion.

  However, in the case of the above, if a foreign object enters from the outside during use of the ring fan, the foreign object may be caught in the tip clearance. In this case, the rotation of the ring fan is locked or the fan motor that drives the ring fan is overheated.

Japanese Patent Laid-Open No. 2007-40110

  The present invention pays attention to such inconveniences, and an object of the present invention is to provide a ring fan capable of effectively avoiding biting of foreign matters in the ring portion.

  In order to achieve such an object, the present invention takes the following measures.

  In other words, the ring fan according to the present invention is rotatably arranged through an annular tip clearance on the inner periphery of the shroud, and is radially extended from the boss portion rotating around the central axis. A plurality of blades, a ring portion for connecting the tips of the plurality of blades, and a plurality of rib-shaped projections for discharging foreign matter provided on the outer peripheral surface of the ring portion facing the tip clearance. The plurality of protrusions are arranged at intervals in the circumferential direction in a posture inclined with respect to the central axis.

  If this is the case, the foreign matter coming from the front side to the ring portion and the tip clearance by the blowing of the ring fan hits the rib-like foreign matter discharge projection portion arranged in an inclined posture with respect to the central axis again. It is possible to quickly scrape back to the rear side while effectively avoiding the foreign matter from splashing back to the front side and hitting other elements such as other radiators. As a result, it is possible to effectively avoid foreign matter biting in the ring portion.

  ADVANTAGE OF THE INVENTION According to this invention, the ring fan which can avoid the biting of the foreign material in a ring part effectively can be provided.

The front view which concerns on one Embodiment of this invention. The front view of the principal part. The typical center sectional view concerning the embodiment. The side view which concerns on FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The ring fan 3 according to the present embodiment constitutes a radiator fan 1 for cooling a radiator R mounted on a vehicle, for example.

  The radiator fan 1 is attached behind the radiator R that dissipates the cooling water of the internal combustion engine of the vehicle, and cools the radiator R by sucking air from the front and discharging it to the rear. Note that the radiator fan 1 of the present embodiment may also serve as a cooling fan for the air conditioner.

  The radiator fan 1 includes a shroud 2 fixed to the radiator R, a ring fan 3 rotatably attached to the shroud 2, and a fan motor 4 for driving the ring fan 3. Since various existing configurations can be applied to the fan motor 4, detailed description in this embodiment is omitted.

  The shroud 2 includes a frame body 21 appropriately attached to the radiator R, an opening 22 provided substantially at the center of the frame body 21, and a cylindrical shape projecting in a cylindrical shape toward the rear at the edge of the opening 22. Part 23, a fan stay 24 extending in a strip shape from four locations around the front side of the opening 22 toward the center of the opening 22, and a fan for rotatably supporting the ring fan 3 provided on the front end side of the fan stay 24 And a support portion 25. In the state shown in FIG. 1 in which the ring fan 3 is supported by the shroud 2, a tip clearance C that is a gap having a predetermined dimension is formed between the ring fan 3, the opening 22, and the cylindrical portion 23.

  Therefore, the ring fan 3 according to the present embodiment is a ring fan 3 that is rotatably disposed via a tip clearance C that forms an annular shape on the inner periphery of the shroud 2, and is a boss that rotates around a central axis 3 a. A plurality of blades 32 extending radially from the portion 33, a ring portion 31 connecting the tips of the plurality of blades 32, and a rib-like shape provided on the outer peripheral surface of the ring portion 31 facing the tip clearance C The plurality of foreign matter discharge projections 35 are provided, and the plurality of projections 35 are arranged at intervals in the circumferential direction in a posture inclined with respect to the central axis 3a. And Hereinafter, the configuration of each part of the ring fan 3 will be described in detail.

  The ring fan 3 integrally includes the plurality of blades 32, the ring portion 31, and a boss portion 33 that is fixed to the fan motor 4 side while the base ends of the plurality of blades 32 are continuous with each other. It is.

  The boss portion 33 is fixed to the drive shaft of the motor at the position of the rotation shaft formed in the center, and protrudes rearward in a cylindrical shape so as to cover the outer periphery of the motor.

  In the present embodiment, three blades 32 are provided between the boss portion 33 and the ring portion 31 so that their angular phases are different from each other every 120 °. The blade 32 rises in an inclined direction with respect to the boss portion 33 and continues to the ring portion 31 while forming a curved surface. As a result, the front surface 32a operates in the direction in which the front surface 32a retracts when the ring fan 3 rotates and the rear surface 32b protrudes, thereby sucking air from the front and discharging it backward.

  The ring portion 31 includes an annular ring body 34 that connects the tips of the blades 32, and the rib-shaped protrusion 35 that protrudes outward from substantially the entire front-rear direction of the ring body 34. The protruding portion 35 has a rib shape protruding in an inclined direction that is the same direction as the direction in which the blade 32 is inclined from the axial direction of the central shaft 3a, and the shape of the rib is substantially S-shaped. It has an elongated shape. Of the rising surfaces of the S-shaped ribs, the front-facing inclined surface 36 is the front-facing surface and the rear-facing inclined surface 37 is the rear-facing inclined surface 36. Further, rounded surfaces 38 are formed on both sides of the standing end of the rib.

  Thus, in the present embodiment, as shown in FIGS. 1, 2, and 4, the plurality of protrusions 35 are provided to be inclined, and the protrusions 35 are arranged at equal intervals. And it arrange | positions so that the front end and the other end of the rear side of each adjacent projection part 35 may overlap with front view. In other words, the plurality of protrusions 35 are provided over the entire circumference of the ring portion 31 when viewed from the front. By disposing the protrusions 35 in this way, when foreign matter is sucked toward the tip clearance C, the foreign matter exclusively contacts the front inclined surface 36. Here, since the front inclined surface 36 moves in the direction of retreating by the rotation operation, the foreign matter does not rebound with a strong momentum. Moreover, since the front inclined surface 36 is inclined in the same direction as the blade 32, the bounced foreign matter moves exclusively toward the rear inclined surface 37. Then, the rear inclined surface 37 operates in a protruding direction by the rotation of the ring fan 3. That is, the foreign matter that hits the rear inclined surface 37 is strongly ejected exclusively backward. That is, most of the foreign matter sucked toward the tip clearance C is quickly ejected rearward without being caught in the tip clearance C or hitting the front radiator R without damaging the radiator R. Further, the protrusion 35 is formed with rounded surfaces 38 at both front and rear ends, thereby preventing the protrusion 35 from forming a right angle or an acute corner. As a result, foreign matter hits the corner portion and is prevented from jumping in an unnatural direction including the front, which contributes to the reliable backward discharge of the foreign matter.

  By adopting the configuration as described above, the ribs are arranged in such a manner that foreign matters coming from the front side to the ring portion 31 and the tip clearance C by the air blow of the ring fan 3 according to the present embodiment are inclined with respect to the central axis 3a. By hitting the protrusion 35 for discharging the foreign matter, the foreign matter rebounds to the front side, and it is effectively avoided that the foreign matter strikes other elements such as other radiators R. That is, the foreign matter is quickly scraped to the rear side. As a result, the biting of the foreign matter in the ring portion 31 minutes is effectively avoided. In the present embodiment, since the rib-like protrusion 35 is formed integrally with the ring main body 34, the rigidity of the ring 31 itself is also effectively improved. Further, by providing the protrusion 35, the size of the tip clearance C itself can be set small, and as a result, the air blowing performance of the ring fan 3 itself is effectively improved. In the present embodiment, since the projection 35 itself is also inclined in the same direction as the blade 32, the air on the front side of the tip clearance C can be discharged rearward. Thereby, the effect | action which can guide a foreign material to the projection part 35 is show | played.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, the ring fan having three blades is disclosed in the above embodiment, but the number of blades is not limited. In addition, the protrusion is formed so as to extend over the entire front and rear sides of the ring portion, but it is needless to say that a plurality of protrusions may be provided on the front and rear. And the protrusion part is not restricted to the aspect extended while curving in S shape like the said embodiment, It is good also as what extends in linear form, circular arc shape, or bending shape. Moreover, it may replace with the round surface provided in the projection part, and the thing which chamfered the excess of the projection part linearly, or was notched in step shape. In addition, the aspect such as the angle at which the protrusion is inclined with respect to the central axis and the specific shape of the protrusion is not limited to that of the above embodiment, and various aspects including the existing ones are applied. be able to.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used as a fan for cooling a radiator or the like mounted on an automobile.

2 ... shroud 3 ... ring fan 3a ... central axis 31 ... ring part 32 ... blade 33 ... boss part 35 ... projection part C ... tip clearance

Claims (1)

A ring fan that is rotatably arranged via a tip clearance that forms an annular shape on the inner periphery of the shroud,
A plurality of blades extending radially from a boss rotating around the central axis, a ring portion connecting the tips of the plurality of blades, and a rib provided on the outer peripheral surface of the ring portion facing the tip clearance A plurality of protrusions for discharging foreign matter,
The ring fan, wherein the plurality of protrusions are arranged at intervals in a circumferential direction in a posture inclined with respect to the central axis.

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