JPH0515598Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a mixed flow fan (mixed flow fan) that is mounted opposite to the back surface of a radiator, and particularly relates to a fan formed of a synthetic resin molded body. .

[Prior art]

A mixed flow fan for a radiator has one end edge of a plurality of wing parts joined to the outer periphery of a truncated cone-shaped boss part that expands downstream, so that the wing parts protrude radially, and the outer periphery of the other end edge of the wing parts. A cylindrical ring part that expands toward the downstream side was fitted over the blade, and the inner surface of the ring part was joined to the tip of the wing part.

[Problem to be solved]

In such a conventional axial flow fan, the boss portion and the ring portion are each inclined so as to expand toward the downstream side, so it was difficult to form it from an integral molded body of synthetic resin. . In other words, a large undercut portion is formed in the mold for molding the mold, making it difficult to remove the mold from the mold. Therefore, each member must be assembled by joining, making the fan expensive and lacking in mass productivity.

[Means for solving problems]

Therefore, the present invention specifies the shape of the ring part 4 of the fan so that a mixed flow fan can be formed using a synthetic resin molded body that can be mass-produced. improved,
The purpose of this invention is to provide a fan with improved lifting force, and its configuration is as follows.

That is, the outer peripheral surface of the boss part 1 is formed as a part of a conical surface that expands toward the downstream side of the airflow, and a plurality of wing parts 3 are integrally formed radially around the outer periphery of the boss part 1. Then, a ring portion 4 formed in a short cylindrical shape is integrally connected between the edges of the respective wing portions 3. It is located opposite to the back surface of the radiator core 10 and is configured to blow air from the front surface of the core 10 to the back surface side. Here, the feature of the present invention is that the inner circumferential surface of the ring portion 4 is formed so as not to expand toward the downstream side of the air flow. Further, among the radial end edges of each wing section 3, the ring section 4 is not present at the downstream portion in the wind raising direction, so that the wing section 3 is constructed of an integrally molded body of synthetic resin.

Therefore, according to the present fan, since the ring portion 4 is formed as described above, the ring portion 4, the boss portion 1, and the wing portion 3 can be integrally molded with a synthetic resin molded body, and the ring portion 4 is formed as described above. It is possible to prevent the space between the inner surface of the portion 4 and the boss portion 1 from narrowing toward the downstream side and obstructing the flow of the airflow 17 as much as possible. That is, since the downstream edge of the ring part 4 is formed so as not to fit over the wing part 3, the airflow 17 can flow smoothly and the motive force can be increased.

Furthermore, in a preferred embodiment of the present invention, the upstream edge of the ring portion 4 is also positioned so as to be set back from the front edge of the wing portion 3, so that the airflow 17 flowing in from the peripheral edge of the radiator core 10 can be smoothly directed. Ring part 4
The motive force at the peripheral edge of the radiator core 10 can also be improved.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view showing the installed state of the radiator fan of the present invention. FIG. 2 is a schematic perspective view of a fan shroud portion 6 provided adjacent to the rear end edge of the ring portion 4, FIG. 3 is a front view of the same fan 5, and FIG. 4 is a partially cutaway side view thereof. Also the fifth
The figure is an enlarged view of the main part of FIG. The fan 5 of this embodiment is made of an integral molded body of synthetic resin, with a mounting part 20 made of a metal plate insert-molded in the center, as shown in FIGS. 3 and 4. The outer peripheral surface of the boss portion 1 is formed into a truncated conical shape, and
A large number of radial wing parts 3 are integrally molded on the outer periphery of the boss part 1, and the outer periphery between the tip edges of the wing parts 3 is formed with a ring part 4.
are integrally connected. This wing part 3 is the third
As shown in the figure, the widths in the plane are each expanded outward in the radial direction, and the separation distance g in the projection direction between the leading edge 18 and the trailing edge 19 of the adjacent wing parts 3, 3 is formed almost constant. has been done. The reason why the wing portion 3 is formed in this way is to increase the wind movement by having the widest possible wing surface. At the same time, a slight gap g is provided in the axial direction so that the movable mold and the fixed mold of the resin molding mold can be separated. Next, the trailing edge of the ring portion 4 is located forward of the trailing edge 19 of the wing portion 3, and the leading edge of the ring portion 4 is located extremely slightly rearward of the leading edge 18 of the wing portion 3. The inner peripheral surfaces of the ring portions 4 are each formed to have the same diameter along the axial direction. Further, a protruding portion 9 is formed in an annular shape on the outer periphery of the ring portion 4 . The fan 5 thus constructed is installed as shown in FIG. That is, the boss portion 1 is rotatably supported by the engine 2. Close to the rear end edge of the ring portion 4 of the fan 5, only its outer periphery is fitted with an annular fan shroud portion 6 with an extremely narrow L-shaped cross section, and the fan shroud portion 6 is supported by the engine 2 by an arm 13. do. Further, the radiator 12 is supported in front of the engine separately and independently from the engine 2, and the front end opening of a short cylindrical radiator shroud 7 is fixed to the rear side peripheral edge of the radiator core 10. The rear end opening edge of the radiator shroud 7 and the edge of the fan shroud portion 6 are connected by a flexible annular band 8 made of a rubber material or the like. The belt pulley 16 is driven by the driving force of the engine via a belt (not shown), and the fan 5 is rotated via the clutch 15. At this time, since both the fan 5 and the fan shroud portion 6 are supported by the engine 2, relative movement between them due to vibrations and the like is extremely small. Therefore, the fan shroud portion 6 can be brought close to the ring portion 4. Furthermore, as shown in FIGS. 1 and 2, this fan shroud portion 6 is formed into an L-shaped cross section and is provided along the outer periphery of the protruding strip portion 9, so that the flow resistance of the air flow between the two is greatly increased. This can prevent air from circulating there. Further, one end of the radiator shroud 7 is fixed to the radiator 12, and it moves relatively largely relative to the wing section 3 due to vibrations of the vehicle, etc., but the rear end edge and the fan shroud section 6 are connected to each other by a flexible annular band. 8, and the rear end edge of the radiator shroud provides a gap with the ring portion 4 and the fan shroud 6 in the diametrical direction and the longitudinal direction, so there is no problem that the two come into contact with each other. Note that since the fan shroud portion 6 is located close to the rear end edge of the ring portion 4, the distance between the rear end of the wing portion 3 and the back surface of the radiator core 10 can be maintained relatively small. This allows for a compact fan mounting structure.

When the fan 5 is driven, the air flow 17 flows as shown by the arrow. That is, the radiator core 10
An air flow 17 is generated from the front side to the back side, flows between the boss part 1 and the ring part 4, and is diffused diagonally rearward. At this time, the ring part 4
The space between the inner surface of the radiator core 10 and the outer surface of the radiator core 10 decreases slightly toward the rear, but this is because the width of the ring portion 4 is narrow, as if the rear edge of the ring portion 4 was cut out. , there is no risk of obstructing the flow of the air flow 17. In addition, the front edge of the ring portion 4 is also
Because it is slightly set back from the front edge of the wing section 3,
In particular, without interfering with the airflow 17 flowing into the fan from the peripheral edge of the radiator core 10,
It can be guided backwards smoothly. As a result, the motive force of the fan 5 can be increased.

[Effect of idea]

The radiator fan of the present invention has the above configuration and has the following effects.

This fan is formed so that the inner circumferential surface of the ring portion 4 does not expand toward the downstream side of the air flow.
The ring portion 4, boss portion 1, and wing portion 3 can be easily manufactured by integral molding of synthetic resin. Since the ring part 4 is not present in the downstream part of the radial edge of the wing part 3 in the wind raising direction,
The air flow 17 flowing inside the ring portion 4 can be smoothly guided in the diagonal flow direction. That is, the flow of the airflow 17 is prevented from being obstructed by the rear edge of the ring portion 4, and the motive force can be improved. And wing part 3
The width in the axial direction is wider than the ring part 4,
Since the blade area is large, the motive force increases from this point as well.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view showing the installed state of the radiator fan of the present invention, Fig. 2 is a schematic perspective view of the fan shroud portion 6 provided adjacent to the rear end edge of the ring portion 4, and Fig. 3 is a schematic diagram of the same fan. 5 is a front view of 5, FIG. 4 is a partially cutaway side view thereof, and FIG. 5 is an enlarged view of the main part of FIG. 1. 1...Boss part, 2...Engine, 3...Wing part,
4...Ring part, 5...Fan, 6...Fan shroud part, 7...Radiator shroud, 8...
... Flexible annular band, 9 ... Convex strip, 10 ... Radiator core, 11 ... Tank, 12 ... Radiator, 13 ... Arm, 14 ... Air flow, 15 ...
Clutch, 16... Belt pulley, 17... Air flow, 18... Front edge, 19... Trailing edge, 20... Mounting section.

Claims (1)

[Claims for Utility Model Registration] 1. A boss portion 1 whose outer circumferential surface expanding toward the downstream side of the air flow is formed as a part of a conical surface, and a plurality of blades formed radially on the outer circumferential surface of the boss portion 1. Part 3 and
a ring part 4 formed in a short cylindrical shape so that the edges of the respective wing parts 3 are integrally connected, and is located opposite to the back surface of the radiator core 10, In a radiator fan that blows air from the front side to the back side, the inner circumferential surface of the ring part 4 is formed so as not to expand toward the downstream side of the airflow, and among the radial edges of the wing parts 3, A fan for a radiator, characterized in that the ring part 4 is not present in the downstream part in the wind raising direction, and is constructed by integrally molding synthetic resin. 2. The fan according to claim 1, wherein a portion of the radial end edge of each of the wing portions 3 in which the ring portion 4 does not exist is provided at an upstream portion in the wind raising direction.