JP4762775B2 - Ring fan and manufacturing method thereof - Google Patents

Description

  The present invention relates to a ring fan and a manufacturing method thereof.

Conventionally, a ring fan integrally formed with resin having a boss portion disposed in the center, a plurality of blades projecting radially outward from the boss portion, and a ring portion for joining tip portions of the blades to each other And the technique of the manufacturing method is well-known (refer patent document 1).
Such a ring fan is integrally formed by sending resin as a raw material into a mold, and at this time, as shown in FIG. 9, a gate 0G for sending the resin into the mold is manufactured. The boss portion 02 of the power ring fan, specifically, near the base end portion of each blade 03, is filled with resin in the order of the blade 03, each blade 03, and the ring portion 04, and is integrally formed.
Further, at this time, the resin joins between the blades 03 of the ring portion 04, and a weld 05 having lower rigidity than that of other portions is formed here.
JP 2005-313640 A

  However, in the conventional ring fan and the manufacturing method thereof, a weld is formed between the blades of the ring portion that originally has a low rigidity, so stress due to the centrifugal force when the ring fan rotates concentrates on the weld. There is a problem in that the durability and sound vibration performance of the ring fan are significantly reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ring fan that can improve durability and sound vibration performance, and a method for manufacturing the same.

  In the ring fan of the present invention, a boss portion disposed in the center, a plurality of blades projecting radially outward from the boss portion, and a ring portion that joins the tip portions of each blade are integrally formed with resin. The formed ring fan is characterized in that a weld formed by joining the resin as a raw material when the ring fan is formed is formed in a portion excluding between the blades of the ring portion.

  In the ring fan manufacturing method of the present invention, a resin is provided with a boss portion disposed at the center, a plurality of blades projecting radially outward from the boss portion, and a ring portion that joins the tip portions of the blades. In the manufacturing method of the ring fan formed integrally, a gate for sending a resin as a material into the mold of the ring fan is arranged between the blades of the ring portion to be manufactured, It is characterized in that a resin as a raw material is fed into a molding die, and a weld where the resin merges is formed at a portion excluding between the blades of the ring portion.

  The ring fan according to claim 1 of the present invention includes a boss portion disposed in the center, a plurality of blades projecting radially outward from the boss portion, and a ring portion that joins tip portions of the blades. In the ring fan that is integrally formed of resin, the weld formed by joining the resin that is the raw material when the ring fan is molded is formed in a portion excluding the space between the blades of the ring part. A ring fan that can improve strength and sound vibration performance can be provided.

  In the ring fan manufacturing method according to claim 4 of the present invention, a boss portion disposed in the center, a plurality of blades projecting radially outward from the boss portion, and a ring portion for joining tip portions of the blades to each other In the method of manufacturing a ring fan integrally formed with resin, a gate for feeding resin as a material into the mold of the ring fan is disposed between the blades of the ring portion to be manufactured. Since the resin as the material is sent from each gate into the mold and the weld where the resin merges is formed at a portion other than between the blades of the ring portion, each blade of the ring portion where the gate is to be manufactured With a simple method of placing them between each other, it is possible to easily form welds at the portions other than between the blades of the ring part, thereby ensuring durability and sound vibration performance. It provides a method of preparing the ring fan that can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
1 is a front view of a ring fan according to a first embodiment of the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 is a cross-sectional view taken along line S4-S4 of FIG. 5 is a cross-sectional view taken along line S5-S5 in FIG. 2, FIGS. 6 and 7 are diagrams for explaining a method of manufacturing the ring fan according to the first embodiment, and FIG. 8 is a diagram illustrating a state in which the ring fan according to the first embodiment is mounted on a vehicle. FIG.

First, the overall configuration will be described.
As shown in FIGS. 1 to 3, the ring fan 1 according to the first embodiment includes a bottomed cylindrical boss portion 2 disposed in the center and a plurality of boss portions 2 projecting radially outward from an outer peripheral portion 2 a. (Embodiment 1 has nine blades) blade-shaped blades 3 and ring-shaped ring portions 4 that connect the tip portions 3a of the blades 3 and are integrally formed of resin.

The boss portion 2 has a fixing hole 2c in which a rotation shaft M1 of a motor M, which will be described later, is fixed at the center O of the bottom portion 2b which is also the center O of the ring fan 1.
The blades 3 are so-called unequal pitch blades having different angles with respect to the adjacent blades 3 and the center O of the ring fan 1 between the blades 3.
Inside the ring portion 4, the tip portion 3 a of each blade 3 is coupled, and the front end thereof is bent into a substantially L shape to form a flange portion 4 a.

  In the first embodiment, a weld 5 is formed at the joint portion between the tip portion 3a and the ring portion 4 of each blade 3 and a resin serving as a material during molding, which will be described later, and the blade 3 of the boss portion 2 is further joined. A weld 6 is formed between them.

Therefore, each blade 3 functions as a rib that reinforces each weld 5 having low rigidity, and thereby, necessary rigidity of the peripheral portion is secured.
On the other hand, as shown in FIGS. 2, 4 and 5, ribs 10 and 11 extending radially from the bottom 2b of the boss 2 to the outer peripheral portion 2a are formed on the inside of the boss 2 so as to correspond to the portions of the welds 6. In addition, the ribs 10 are coupled to each other by circular ribs 12, thereby ensuring the necessary rigidity of the peripheral portion of the weld 6 where the rigidity is lowered.
In the first embodiment, the ribs 10, 11, and 12 are provided on the inner side of the boss portion 2, but may be provided on the outer side.

Hereinafter, a method for manufacturing the ring fan 1 of the first embodiment will be described.
When manufacturing the ring fan 1 configured as described above, as shown in FIG. 6, the ring fan 1 can be divided in the direction of the rotation axis of the ring fan 1 to be manufactured and the ring fan 1 to be manufactured in the inside thereof. Upper and lower molds 8 and 9 having an outer space R are prepared, and a material resin is sent between the blades 3 of the ring portion 4 to be manufactured in the upper mold 8 into the space R. Are arranged (see FIGS. 1 and 3).

  Therefore, when the resin as the raw material is sent out from each gate G, the resin is filled between the blades 3 of the ring portion 4 as shown in FIG. Resins merge at the binding site to form weld 5.

  Subsequently, after each blade 3 is formed, the resin joins between the blades 3 of the boss portion 2 to form a weld 6 near the outer peripheral portion 2a. In addition, since the resin reaches substantially the same time in the vicinity of the center O of the boss portion 2, a weld that is clearly apparent in appearance is not formed.

Therefore, in the ring fan 1 according to the first embodiment, the weld 5 is provided at the joint portion between the tip 3a and the ring 4 of each blade 3, and the weld 6 is provided between the blades 3 of the boss 2 of the boss 2. It is formed.
In addition, although it is a supplement, the quantity and speed | rate of resin sent out from each gate G are adjusted suitably in the middle of filling.

Next, the operation will be described.
As shown in FIG. 8, when mounted on the vehicle, the ring fan 1 is fixed to the fan shroud 20 with the rotating shaft M <b> 1 of the motor M being fixed to the fixing hole 2 c of the boss portion 2, and exchanges heat with the ring fan 1. A container 21 is arranged oppositely.
Then, when the ring fan 1 rotates through the drive of the motor M, the heat exchanger 21 is cooled and functions as a fan.

  Here, in the conventional invention, since a weld is formed between the blades of the ring portion with originally low rigidity, the stress due to the centrifugal force during the rotation of the ring fan concentrates on the weld, and the ring fan There existed a problem that durability strength and sound vibration performance will fall significantly.

  However, in the ring fan 1 of the first embodiment, since the weld 5 is formed at the joint portion between the tip 3a of each blade 3 and the ring portion 4, each blade 3 serves as a rib for reinforcing the weld. As a result, the required rigidity of the peripheral portion can be secured, and the durability and sound vibration performance can be improved as compared with the conventional ring fan.

Further, the weld 6 formed on the boss portion 2 can be reinforced by the ribs 10 and 11, and the necessary rigidity can be easily secured.
Furthermore, even if the weld formation position changes due to the change in the number of blades 3, the formation positions of the ribs 10 and 11 can be easily dealt with only by designing and changing compared to the case where the weld is formed in the middle part of the blade 3 or the like. it can.

Next, the effect will be described.
As described above, in the ring fan 1 according to the first embodiment, the boss portion 2 disposed at the center, the plurality of blades 3 projecting radially outward from the boss portion 2, and the blades 3. In the ring fan 1 that is integrally formed of resin with the ring portion 4 that joins the tip portions 3a of the ring, welds 5 and 6 that are formed by joining the resin as a material when the ring fan 1 is molded are ring-shaped. Since the portion 4 is formed at a portion other than between the blades 3, the rigidity between the blades 3 of the ring portion 4 can be improved as compared with the conventional invention, whereby the durability and sound vibration of the ring fan 1 can be improved. Performance can be improved.

Further, since the weld 5 is formed at the joint portion between the tip 3 a and the ring portion 4 of each blade 3 and the boss portion 2, the weld 5 formed at the joint portion can be reinforced by the blade 3.
Further, the weld 6 formed in the boss portion 2 disposed at the center of the ring fan 1 has a minimum stress due to the centrifugal force during the rotation of the ring fan 1 as compared with other parts, and is hardly affected by that.

  In addition, ribs 10 and 11 formed radially from the bottom 2b of the boss 2 to the outer periphery 2a are provided in accordance with the site where the weld 6 of the boss 2 is formed. Compared to the case of forming in this way, it is possible to cope with an easy design change.

  Further, in the method of manufacturing the ring fan 1 according to the first embodiment, the boss portion 2 disposed at the center, the plurality of blades 3 projecting radially outward from the boss portion 2, and the tips of the blades 3 In the manufacturing method of the ring fan 1 which is provided with the ring part 4 which joins the parts 3a and is integrally formed with the resin, the gate G for sending the resin as the material into the upper and lower molds 8 and 9 of the ring fan 1, It arrange | positions between each braid | blade 3 of the ring part 4 which should be manufactured, sends resin which becomes a raw material into each of the upper and lower molds 8 and 9 from each gate G, and welds 5 and 6 to which the resin merges Since the gate G is formed in a portion excluding the space between the blades 3, the weld can be easily attached to each blade of the ring portion 4 by a simple method of arranging the gate G between the blades 3 of the ring portion 4 to be manufactured. Forming in the part except between 3 Can, thereby, possible to provide a method of manufacturing a ring fan 1 capable of improving the durability strength and sound vibration performance.

  In addition, the resin as a raw material is sent from each gate G into the mold, and is integrally formed in the order of the ring portion 4, each blade 3, and the boss portion 2, so that the welds 5 and 6 where the resin merges are formed. Is formed at the joint portion between the tip portion 3a and the ring portion 4 of each blade 3 and the boss portion 2, so that the weld 5 formed at the joint portion between the tip portion 3a of each blade 3 and the ring portion 4 is formed by the blade 3. In addition to being able to reinforce, the weld 6 can be formed on the boss portion 2 where the centrifugal force during the rotation of the ring fan 1 is minimal to prevent its adverse effects.

  Further, by sending out the resin from the outside of the ring fan 1 toward the center O, the filling balance can be stabilized and the product reliability can be improved.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, the blades 3 are not limited to unequal pitch blades, and may be equal pitch blades in which the angles with respect to the center O of the ring fan 1 between adjacent blades 3 are equal between the blades 3. The number of blades 3 can be set as appropriate.

  If the weld is provided in the middle part of the blade 3, the sound vibration performance may be deteriorated, and the resin filling control becomes complicated and the balance of the ring fan is likely to be deteriorated.

  In the first embodiment, the gate G is disposed between the blades 3 of the ring portion 4 to be manufactured. However, the ring fan 1 is provided with the gate G also provided in the boss portion 2 to control the resin delivery speed. May be formed. In short, it is only necessary that the weld be formed at a portion other than between the blades 3 of the ring portion 4, and detailed design changes including the molding die performed within the range are all within the scope of the present invention.

It is a front view of the ring fan of Example 1 of the present invention. It is a rear view of the ring fan of Example 1 of this invention. It is a perspective view of the ring fan of Example 1 of the present invention. FIG. 2 is a cross-sectional view (partially omitted) taken along line S4-S4 of FIG. It is sectional drawing in the S5-S5 line | wire of FIG. It is a figure explaining the manufacturing method of the ring fan of the present Example 1. FIG. It is a figure explaining the manufacturing method of the ring fan of the present Example 1. FIG. It is a figure explaining the vehicle mounting state of the ring fan of the present Example 1. FIG. It is a figure explaining the manufacturing method of the conventional ring fan.

Explanation of symbols

G Gate M Motor M1 Rotating shaft R Space 1 Ring fan 2 Boss part 2a Outer part 2b Bottom part 2c Fixing hole 3 Blade 3a Tip part 4 Ring part 4a Flange part 5, 6 Weld 8 Upper mold 9 Lower mold 10, 11, 12 Rib 20 fan shroud 21 heat exchanger

Claims (5)

In a ring fan formed integrally with a resin comprising a boss portion arranged in the center, a plurality of blades projecting radially outward from this boss portion, and a ring portion that joins the tip portions of each blade,
A ring fan characterized in that a weld formed by joining resin as a raw material at the time of molding of the ring fan is formed at a portion excluding between the blades of the ring portion. The ring fan according to claim 1,
A ring fan characterized in that the weld is formed at a joint portion between a tip portion and a ring portion of each blade and a boss portion. The ring fan according to claim 2,
A ring fan characterized in that ribs formed radially from the bottom of the boss part to the outer peripheral part are provided in accordance with a portion where the weld of the boss part is formed. Manufacture of a ring fan that is integrally formed of resin with a boss portion disposed in the center, a plurality of blades projecting radially outward from the boss portion, and a ring portion that joins the tip portions of each blade. In the method
A gate that feeds the resin as a material into the mold of the ring fan is arranged between the blades of the ring part to be manufactured,
A method for manufacturing a ring fan, wherein a resin as a raw material is sent from each gate into a mold and a weld where the resin merges is formed at a portion excluding between the blades of the ring portion. In the manufacturing method of the ring fan of Claim 4,
The resin as a raw material is fed from the gates into the mold and is integrally formed in the order of the ring portion, the blades, and the boss portion. A ring fan manufacturing method, characterized in that the ring fan is formed on a boss part and a joint part of the part.

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