JP2007009714A - Easily recyclable sirocco fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily recyclable Sirocco fan which allows recycling by easily removing a metal bearing part fitted to a driving shaft, offers excellent strength and durability, mitigates deflection and unbalance in operation, eliminates the occurrence of vibration and noise, and becomes friendly to a human being and global environment. <P>SOLUTION: A Sirocco fan 1 is provided with a disk-like base 2 provided with a recess 6 in the midsection and a metal insert boss 8 having a driving shaft hole 7 formed in the center of the recess 6 and fitted to the driving shaft, a blade 4 cylindrically formed by combining a plurality of blades 3 in the outer peripheral part of the disk-like base 2 and a reinforcing ring 5 provided to the end of the blade 3, all of which are integrally injection-molded by using a polyolefin resin composition. The metal insert boss 8 is surely fixed onto a contact surface 9 with the disk-like base 2 thereof during operation. A fix/separate part 10 which can easily separates the metal insert boss 8 is integrally formed with the metal insert boss 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recyclable sirocco fan. More specifically, the present invention relates to a disk-shaped base portion, a wing portion formed by connecting a large number of blades to the outer periphery thereof, and a cylindrical shape, and an end portion of the wing. The present invention relates to a sirocco fan configured by integrally injection-molding a provided reinforcing ring using a polyolefin resin composition.

Conventionally, a sirocco fan main body used for kitchen use or the like sends out gas flowing in the direction of the rotation axis in a direction perpendicular to the rotation axis, or vice versa, sends out gas flowing in the direction of the rotation axis in the direction of the rotation axis. It is like that.
FIG. 4 is a block diagram showing a conventional sirocco fan. A conventional sirocco fan 50 (see, for example, Patent Documents 1 and 2) has a structure in which a bearing portion 51 is mounted at the center of a disk-like base portion 52 so as to withstand torque at startup and a load during rotation. A drive shaft hole (not shown) that penetrates through the center of the portion 51 and fits with the drive shaft 53 is provided, the drive shaft 53 is inserted into the drive shaft hole, and a fixing nut 54 is screwed into the tip of the drive shaft 53. Thus, the drive shaft 53 is fixed. A plurality of thin-walled blades 55 are joined to the outer periphery of the disk-shaped base portion 52 to form a cylindrical shape, and a reinforcing ring 57 is formed at the end of the blade 55.
The sirocco fan 50 is manufactured by fixing the blades 55 by caulking or the like using a thin steel plate, a thin aluminum plate, or the like so as to withstand the centrifugal force during high-speed rotation. The sirocco fan 50 made of metal is provided with a balancer 58 to the reinforcing ring 57 in order to maintain a balance during rotation.

However, the sirocco fan 50 made of a conventional metal has a high material cost and manufacturing cost, and there is a problem that it is necessary to add a balancer 58 and it takes a lot of work time.
In order to improve this problem, there has been proposed a sirocco fan that is integrally formed of a plastic compounded with glass fibers as shown in FIG. 3 (see Patent Document 3).
In FIG. 3, 31 is a centrifugal blower, 33 is a blade part composed of a main blade 40, an auxiliary blade 41 and a mortar-shaped reinforcing plate 37 housed in a case 32 and a bottom surface 42, and 43 is a blade directly connected to a motor 34. A shaft boss that rotates the portion 33, 39 is a reinforcing ring that holds the blade portion 33 in a cylindrical shape, and 35 and 36 are an air outlet and an air intake provided in the case. In such a blade portion 33, resin is injected from a resin injection gate, and a product is integrally formed.

On the other hand, a sirocco fan in which a bearing portion, a disk-shaped base portion, a wing, a ring, etc. are integrally formed by injection using a synthetic resin in which 25 to 35% of a glass long fiber is blended with a polypropylene resin has been proposed. (See Patent Document 4).
JP 2000-314391 A Japanese Patent Application Laid-Open No. 07-77196 JP 09-126189 A JP 2002-317792 A

  However, strong sirocco fan products with glass fiber blended with conventional synthetic resin are difficult to recycle materials, and the bearing that fits the drive shaft is made of resin blended with glass fiber. However, there is a problem with durability and there is a risk of vibration and noise during operation. On the other hand, if the bearing part that fits into the drive shaft is made of metal and it is insert-molded, the metal bearing part must be Since it is not designed to be easily removed and recycled, there is a problem that it cannot be said that the product is friendly to the global environment.

  The object of the present invention is to solve the problems of the conventional metal sirocco fan that requires high work cost due to high material cost and manufacturing cost, and it is easy to recycle the material and drive. Easily remove and recycle the metal bearing that fits the shaft. Excellent strength and durability, no vibration and noise during operation, friendly to human and global environment, easy to recycle Is to provide sirocco fans.

The sirocco fan according to claim 1 of the present invention for solving the above problems is provided with a metal insert boss having a recess at the center and a drive shaft hole fitted to the drive shaft at the center of the recess. A polyolefin-based resin composition comprising: a disc-shaped base portion; a wing portion formed by connecting a large number of blades to the outer periphery of the disc-shaped base portion to form a cylindrical shape; and a reinforcing ring provided at an end portion of the wing. A sirocco fan that is integrally injection molded using
There is a fixing / separating portion that securely fixes the metal insert boss to the contact surface of the metal insert boss with the disk-shaped base portion during operation of the sirocco fan and can easily separate the metal insert boss during recycling. A metal insert boss formed integrally with the metal insert boss is used.

  The sirocco fan according to claim 2 of the present invention is the sirocco fan according to claim 1, wherein the sirocco fan according to claim 1 is provided on at least one of the surface on the wing portion side and the surface on the opposite side of the wing portion. A plurality of reinforcing ribs are provided radially outward from the metal insert boss and perpendicular to the surface.

  The sirocco fan according to claim 3 of the present invention is the sirocco fan according to claim 1 or 2, wherein the fixing / separating portion is at least one in the longitudinal direction of the metal insert boss parallel to the drive shaft. A plurality of convex fixing / separating parts formed in the part, or a plurality of concave fixing / separating parts formed in at least one part in the longitudinal direction of the metal insert boss parallel to the drive shaft, Alternatively, the fixing / separating unit is a combination of these.

  A sirocco fan according to a fourth aspect of the present invention is the sirocco fan according to the first or second aspect, wherein the fixing / separating portion is a reverse screw formed in at least one portion in the longitudinal direction of the metal insert boss. It is a shape fixing / separating part.

  A sirocco fan according to a fifth aspect of the present invention is the sirocco fan according to the first or second aspect, wherein the drive shaft is inserted into a drive shaft hole of the metal insert boss and fitted into an end portion of the sirocco fan. Further, the fixing / separating portion protruding outward at a right angle to the longitudinal direction of the metal insert boss is integrally formed with the metal insert boss.

  A sirocco fan according to a sixth aspect of the present invention is the sirocco fan according to any one of the first to fifth aspects, wherein the center of gravity of the sirocco fan is in the space inside the wing portion formed in a cylindrical shape. It is characterized in that it is on the center line of the drive shaft and is located at the position of the metal insert boss or in the vicinity of the metal insert boss.

  A sirocco fan according to a seventh aspect of the present invention is the sirocco fan according to the sixth aspect, wherein a metal insert boss formed using a metal having a large specific gravity is used.

  The sirocco fan according to claim 8 of the present invention is the sirocco fan according to claim 7, characterized in that brass is used as the metal.

  The sirocco fan according to claim 9 of the present invention is characterized in that, in the sirocco fan according to any one of claims 1 to 8, a polypropylene resin composition is used as the polyolefin resin composition. .

  The sirocco fan of Claim 10 of this invention is a sirocco fan of Claim 9, The polypropylene resin composition which contains 60-90 mass parts of polypropylene resins and 40-10 mass parts of talc as said polypropylene resin composition. It is characterized by using.

The sirocco fan according to claim 1 of the present invention has a disc-shaped base portion provided with a metal insert boss having a recess at the center and a drive shaft hole fitted to the drive shaft at the center of the recess, A wing part formed in a cylindrical shape by connecting a large number of wings to the outer periphery of the disk-shaped base part and a reinforcing ring provided at the end of the wings are integrally injected using a polyolefin resin composition. A sirocco fan made by molding,
A fixing / separating portion that securely fixes the metal insert boss to the contact surface of the metal insert boss with the disk-shaped base portion during operation of the sirocco fan and can easily separate the metal insert boss during recycling. Since the metal insert boss formed integrally with the metal insert boss is used,
The conventional metal sirocco fan has a high material cost and manufacturing cost, and it is necessary to add a balancer and requires a lot of work time. It is excellent in strength and durability, and generates vibration and noise during operation. In addition, the material can be easily recycled, and the metal insert boss fitted to the drive shaft can be easily removed and recycled. This brings about a remarkable effect of being friendly to humans and the global environment.

  In addition, polyolefin resin compositions are inexpensive and easy to obtain, have excellent processability and fluidity, and can be easily and sirocco-fabricated, and have a low density, high acid resistance, alkali resistance, and oil resistance. Excellent chemical resistance, excellent mechanical strength and durability, resistant to dirt when used in kitchens, etc., can be cleaned with detergent, etc. There are significant effects such as no runout and balance loss.

The sirocco fan according to claim 2 of the present invention is the sirocco fan according to claim 1, wherein the sirocco fan according to claim 1 is provided on at least one of the surface on the wing portion side and the surface on the opposite side of the wing portion. Since a plurality of reinforcing ribs are provided radially outward from the metal insert boss and perpendicular to the surface,
It is further excellent in strength and durability, and has a further remarkable effect that vibration and noise are reliably eliminated during operation.

The sirocco fan according to claim 3 of the present invention is the sirocco fan according to claim 1 or 2, wherein the fixing / separating portion is at least one in the longitudinal direction of the metal insert boss parallel to the drive shaft. A plurality of convex fixing / separating parts formed in the part, or a plurality of concave fixing / separating parts formed in at least one part in the longitudinal direction of the metal insert boss parallel to the drive shaft, Or it is a fixed / separating part that combines these,
It is easy to insert-mold the metal insert boss easily by injection molding integrally using a polyolefin resin composition, and further has the remarkable effect that the metal insert boss can be easily removed and recycled. .

A sirocco fan according to a fourth aspect of the present invention is the sirocco fan according to the first or second aspect, wherein the fixing / separating portion is a reverse screw formed in at least one portion in the longitudinal direction of the metal insert boss. Since it is a fixed / separating part,
The metal insert boss can be easily formed by injection molding using a polyolefin resin composition, and the metal insert boss can be more securely fixed during sirocco fan operation, and easy to remove. Can be removed and recycled.

A sirocco fan according to a fifth aspect of the present invention is the sirocco fan according to the first or second aspect, wherein the drive shaft is inserted into a drive shaft hole of the metal insert boss and fitted into an end portion of the sirocco fan. In addition, since the fixing / separating portion protruding outward at a right angle to the longitudinal direction of the metal insert boss is integrally formed with the metal insert boss,
The structure is simple, and it is easy to insert-mold the metal insert boss easily by injection molding with polyolefin resin composition, and the metal insert boss is more securely fixed during sirocco fan operation. And can be easily removed and removed when removed, with the added advantage of being recyclable.

A sirocco fan according to a sixth aspect of the present invention is the sirocco fan according to any one of the first to fifth aspects, wherein the center of gravity of the sirocco fan is in the space inside the wing portion formed in a cylindrical shape. Since it is on the center line of the drive shaft and is configured to be in the position of the metal insert boss or in the vicinity of the metal insert boss,
When the sirocco fan is operated, the balance is not lost, and there is a further remarkable effect that vibration and noise are reduced.

Since the sirocco fan according to claim 7 of the present invention uses a metal insert boss formed using a metal having a large specific gravity in the sirocco fan according to claim 6,
The structure is simple, the balance is not lost, and there is a further remarkable effect that vibration and noise are less generated when the sirocco fan is operated.

Since the sirocco fan according to claim 8 of the present invention uses brass as the metal in the sirocco fan according to claim 7,
In addition to being inexpensive and easy to obtain, the metal insert boss can be produced with a remarkable effect that it is difficult to rust, has good workability, and can be easily and accurately produced.

The sirocco fan according to claim 9 of the present invention uses a polypropylene resin composition as the polyolefin resin composition in the sirocco fan according to any one of claims 1 to 8,
Polypropylene resin compositions are inexpensive and easy to obtain, have good workability and fluidity, and can easily produce sirocco fans with high accuracy and low density, and have high acid resistance, alkali resistance, oil resistance, etc. Excellent chemical properties, better mechanical strength and durability than polyethylene-based resin, can be cleaned with detergent etc. even if it is hard to get dirty in kitchens, etc. There is no shake and balance does not break, so there is no vibration or noise during operation, and a highly reliable sirocco fan can be provided, and it can be recycled and reused. It does not occur, and from this point, it has the further remarkable effect of being friendly to people and the global environment.

The sirocco fan of Claim 10 of this invention is a sirocco fan of Claim 9, The polypropylene resin composition which contains 60-90 mass parts of polypropylene resins and 40-10 mass parts of talc as said polypropylene resin composition. So use
There is a further remarkable effect that the mechanical strength can be improved without impairing processability, fluidity, acid resistance, alkali resistance and the like.

Next, the present invention will be described in detail based on embodiments with reference to the drawings.
[First Embodiment]
FIGS. 1A, 1B, and 1C are explanatory views for explaining an example of an easily recyclable sirocco fan according to the present invention.
FIG. 1A is an explanatory view illustrating a cross section of the sirocco fan of the present invention.
FIG. 1B is an explanatory view illustrating an outer surface of the sirocco fan of the present invention of FIG.
FIG. 1C is an explanatory view illustrating an outer surface of the sirocco fan of the present invention of FIG.

As shown in FIGS. 1A, 1 </ b> B, and 1 </ b> C, the sirocco fan 1 of the present invention includes a disc-shaped base portion 2 (outer diameter: 211 mm) and an outer peripheral portion of the disc-shaped base portion 2. Are provided with a plurality of blades 3 (length from the disk-shaped base portion 2 to the end: 105 mm) and formed into a cylindrical shape, and a reinforcing ring 5 provided at the end of the blade 3. ing.
The disc-shaped base portion 2 has a concave portion 6 (depth: 8 mm) that is recessed toward the wing portion 4 at the center thereof, and a drive that fits a drive shaft (not shown) at the center of the concave portion 6. A metal insert boss 8 (made of brass) having a shaft hole 7 is provided.

  The contact surface 9 between the metal insert boss 8 and the disc-shaped base portion 2 is provided on the outer peripheral surface of the metal insert boss 8 so that the metal insert boss 8 is securely fixed during operation of the sirocco fan 1. A fixing / separating portion 10 that is recessed in the direction of the drive shaft hole 7 is formed at substantially the center in the length direction. Since the fixing / separating portion 10 is a small recess, it can be easily separated from the disk-shaped base portion 2 by hitting one end portion of the metal insert boss 8 with, for example, a punch during recycling.

  A support groove 14 for fixing a metal insert boss 8 to a drive shaft (not shown) by inserting a pin provided on a drive shaft (not shown) on the tip surface opposite to the wing portion 4 of the metal insert boss 8 is provided. ing.

  A plurality of reinforcing ribs 11 are provided on the surface of the disk-like base portion 2 on the wing portion 4 side, radially outward from the metal insert boss 8 and perpendicular to the surface on the wing portion 4 side. .

  Further, a plurality of reinforcing ribs are formed on the surface of the disk-shaped base portion 2 opposite to the wing portion 4, radially outward from the metal insert boss 8 and perpendicular to the surface opposite to the wing portion 4. 12 is provided.

  Further, on the surface of the disc-shaped base portion 2 opposite to the wing portion 4, the disc-shaped base portion 2 is formed in a circular shape around the metal insert boss 8 at the substantially central portion of the plurality of reinforcing ribs 12. Reinforcing ribs 13 having the same height as the plurality of reinforcing ribs 12 are provided at right angles to the surface opposite to the wing portion 4.

  The height of the reinforcing ribs 11, 12, and 13 is not particularly limited. However, as shown in FIG. 1, it is preferable that the height does not exceed the depth H of the recess 6. Exceeding the depth H of the recess 6 is not preferable because the reinforcing ribs 11, 12, and 13 may protrude to the outside and come into contact with other parts or cause an obstacle.

  Since the sirocco fan 1 is provided with a plurality of reinforcing ribs 11, 12, 13, the strength and durability of the contact portion between the disc-like base portion 2 and the metal insert boss 8 and the disc-like base portion 2. Etc., and shape stability and dimensional stability are improved, and vibration and noise are reliably eliminated during operation. The sirocco fan 1 is easy to recycle materials, and can be easily removed by recycling a metal insert boss 8 fitted to a drive shaft (not shown), which is friendly to humans and the global environment.

The sirocco fan 1 of the present invention includes a disc-shaped base portion 2 provided with a metal insert boss 8, and a wing portion 4 formed in a cylindrical shape by connecting a large number of blades 3 to the outer peripheral portion of the disc-shaped base portion 2. The reinforcing ring 5 provided at the end of the wing 3 is integrally injection-molded with a polyolefin resin composition (trade name: Chissopolypropyleneform TW: 80% by mass of polypropylene, 20% by mass of talc). Since it is configured, the material cost and the manufacturing cost are low, and the sirocco fan 1 can be easily produced without the need for balance adjustment after production if it is molded under stable molding conditions.
For example, the sirocco fan 1 has an appropriate size and shape in the appropriate mold position so that balance adjustment is possible even if imbalance occurs, and the balance can be adjusted with the mold. The sirocco fan 1 can be easily produced at low cost.

  The center of gravity W of the sirocco fan 1 of the present invention is on the center line 16 of the drive shaft (not shown) in the space 15 inside the wing part 4 formed in a cylindrical shape, and the position of the metal insert boss 8 (for example, FIG. 1 (A) (position of W1) or in the vicinity of the metal insert boss 8 (for example, the position of W2 shown in FIG. 1 (A)). As a result, the accuracy of the sirocco fan 1 is improved. Since it is held, there is no runout, and the balance is not lost, vibration and noise are less generated when the sirocco fan 1 is operated.

  In order to have the center of gravity W at the position of W1 or W2, first, the overall mass balance of the sirocco fan 1 is taken and designed and manufactured so that the center of gravity W is on the center line 16. For example, (1) the thickness of the disc-shaped base portion 2 is increased, (2) the depth H of the concave portion 6 is decreased within a range that does not impair the strength and durability, and (3) a metal insert boss (8) The metal insert boss 8 itself is enlarged and made heavy. (5) The number and thickness of the reinforcing ribs 11, 12, and 13 are increased. (6) At least one means selected from means such as reducing the thickness of the blade 3 and reducing the weight of the blade 4 within a range that does not impair the strength and durability is used.

[Second Embodiment]
FIGS. 2A to 2E are explanatory views for explaining examples of other metal insert bosses used in the easily recyclable sirocco fan of the present invention.
The metal insert boss 8A shown in FIG. 2 (a) is securely attached to the contact surface 9 between the metal insert boss 8A and the disc-like base portion 2 (not shown) while the sirocco fan is operating. A fixed / separating portion 10A including a plurality of recesses is formed integrally with the metal insert boss 8A so as to be fixed in parallel with the entire length in the length direction of the outer peripheral surface of the metal insert boss 8A.
A disc-like base portion 2 (not shown) provided with a metal insert boss 8A, a wing portion 4 (not shown) formed on the outer peripheral portion of the disc-like base portion 2, and a reinforcing ring 5 provided at the end of the wing 3 Since it is easy to perform injection molding integrally using a polyolefin resin composition and the fixing / separating portion 10A is a small recess, the end portion of the metal insert boss 8A is not illustrated using a punch or the like during recycling. The base portion 2 can be easily separated.
The other sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8A is used instead of the metal insert boss 8.

[Third Embodiment]
The metal insert boss 8B shown in FIG. 2 (b) is securely attached to the contact surface 9 between the metal insert boss 8B and the disc-like base portion 2 (not shown) while the sirocco fan is operating. A fixing / separating portion 10B composed of a plurality of convex portions is formed integrally with the metal insert boss 8B so as to be fixed in parallel with the entire length in the length direction of the outer peripheral surface of the metal insert boss 8B.
A disc-like base portion 2 (not shown) provided with a metal insert boss 8B, a wing portion 4 (not shown) formed on the outer peripheral portion of the disc-like base portion 2, and a reinforcing ring 5 provided at the end of the wing 3 are provided. In addition to easy injection molding using a polyolefin-based resin composition, the fixing / separating part 10B is a small convex part, so that the end of the metal insert boss 8B is not shown in a circle (not shown) using a punch or the like during recycling. It can be easily separated from the plate-like base portion 2.
Another sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8B is used instead of the metal insert boss 8.

[Fourth Embodiment]
The metal insert boss 8C shown in FIG. 2 (c) is securely attached to the contact surface 9 between the metal insert boss 8C and the disc-like base portion 2 (not shown) while the sirocco fan is operating. A reverse screw-like fixing / separating portion 10C is integrally formed with the metal insert boss 8C over the entire length of the outer peripheral surface of the metal insert boss 8C so as to be fixed.
A disc-like base portion 2 (not shown) provided with a metal insert boss 8C, a wing portion 4 (not shown) formed on the outer peripheral portion of the disc-like base portion 2, and a reinforcing ring 5 provided at the end of the wing 3 are provided. In addition to easy injection molding using a polyolefin resin composition, the metal insert boss 8C is further tightened during operation of the sirocco fan, so that the metal insert boss 8C can be more stably and securely fixed. If the end of the made insert boss 8C is rotated clockwise using, for example, a wrench, it can be easily separated from the disc-like base portion 2 (not shown).
The other sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8C is used instead of the metal insert boss 8.

[Fifth Embodiment]
The metal insert boss 8D shown in FIG. 2 (d) is made of a metal insert boss 8D at the end of the metal insert boss 8D at the end where the drive shaft (not shown) is inserted into the drive shaft hole 7 and fitted. A fixing / separating portion 10D protruding outward at a right angle to the longitudinal direction is provided integrally with the metal insert boss 8D so that the metal insert boss 8D is securely fixed during operation of the sirocco fan. Yes. The fixing / separating portion 10D of the metal insert boss 8D is in contact with the disc-like base portion 2 (not shown) at the contact surface 9.
A support groove 14 for fixing a metal insert boss 8D to a drive shaft (not shown) by inserting a pin provided on a drive shaft (not shown) on the tip surface opposite to the wing portion 4 (not shown) of the metal insert boss 8D. Is provided.
A disk-shaped base portion 2 provided with a metal insert boss 8D, a wing portion 4 (not shown) formed on the outer peripheral portion of the disk-shaped base portion 2, and a reinforcing ring 5 provided at an end portion of the wing 3 are polyolefin-based. The resin composition is easily injection-molded integrally, and at the time of recycling, the end of the metal insert boss 8D can be easily separated from the disc-shaped base portion 2 (not shown) using, for example, a wrench. .
The other sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8D is used instead of the metal insert boss 8.

[Sixth Embodiment]
The metal insert boss 8E shown in FIG. 2 (e) is fixed to the metal insert boss 8D shown in FIG. 2 (d) by a plurality of recesses of the metal insert boss 8A shown in FIG. The separator 10A is combined.
A disk-shaped base portion 2 provided with a metal insert boss 8E, a wing portion 4 (not shown) formed on the outer peripheral portion of the disk-shaped base portion 2, and a reinforcing ring 5 provided at the end of the wing 3 are polyolefin-based. In addition to being easy to integrally injection mold using the resin composition, the end of the metal insert boss 8E can be easily separated from the disc-shaped base 2 (not shown) using a wrench or the like during recycling. .
The other sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8E is used instead of the metal insert boss 8.

[Seventh Embodiment]
The metal insert boss 8F shown in FIG. 2 (F) is fixed to the metal insert boss 8D shown in FIG. 2 (D) by a plurality of convex portions of the metal insert boss 8B shown in FIG. 2 (B). A combination of the separation unit 10B.
A disc-shaped base portion 2 provided with a metal insert boss 8F, a wing portion 4 (not shown) formed on the outer peripheral portion of the disc-shaped base portion 2, and a reinforcing ring 5 provided at the end of the wing 3 are polyolefin-based. The resin composition is easily injection-molded integrally, and at the time of recycling, the end portion of the metal insert boss 8F can be easily separated from the disc-shaped base portion 2 (not shown) using, for example, a wrench. .
The other sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8F is used instead of the metal insert boss 8.

[Eighth Embodiment]
The metal insert boss 8G shown in FIG. 2 (G) has a reverse screw-like fixing / separating portion of the metal insert boss 8D shown in FIG. 2 (C) to the metal insert boss 8D shown in FIG. 2 (D). 10C is combined.
A disc-shaped base portion 2 provided with a metal insert boss 8G, a wing portion 4 (not shown) formed on the outer peripheral portion of the disc-shaped base portion 2, and a reinforcing ring 5 provided at the end of the wing 3 are polyolefin-based. The resin composition can be easily injection-molded integrally, and at the time of recycling, the end of the metal insert boss 8G can be easily separated from the disc-shaped base portion 2 (not shown) using, for example, a wrench. Yes.
The other sirocco fan of the present invention is the same as the sirocco fan 1 shown in FIG. 1 except that a metal insert boss 8G is used instead of the metal insert boss 8.

  The polyolefin resin composition used in the present invention is a polymerization of olefins such as ethylene, propylene, butadiene, 1-butene, isobutene, isoprene, vinyl acetate, acrylic acid, ethyl acrylate, or diolefins or vinyl monomers. It refers to a composition in which at least one selected from an antioxidant, a UV absorber, a filler such as talc, a pigment, and the like is blended in a resin made of a copolymer at an optimum ratio.

  Among polyolefin-based resin compositions, polypropylene-based resin compositions are inexpensive and easy to obtain, have good workability and fluidity, and can be easily integrated into sirocco fans with high accuracy, with low density, acid resistance, and alkali resistance. High oil resistance, excellent chemical resistance, better mechanical strength and durability than polyethylene resins, and can be cleaned with detergent etc. Therefore, accuracy is maintained, no runout occurs, and balance is not lost, so there is no generation of vibration or noise during operation, and a highly reliable sirocco fan can be provided, which can be recycled and reused. However, since only carbon dioxide and water are generated, it can be preferably used in the present invention.

  The polypropylene resin may be a propylene homopolymer, or a random copolymer or block copolymer of propylene with other olefins such as ethylene and 1-butene, but has a high crystallinity and excellent crystallinity. A flexible polypropylene resin can be preferably used in the present invention.

When a polypropylene resin composition containing 60 to 90 parts by mass of polypropylene resin and 40 to 10 parts by mass of talc is used as the polypropylene resin composition, mechanical properties are not impaired without impairing workability, fluidity, acid resistance, alkali resistance and the like. Since strength can be improved, it can be preferably used in the present invention.
If the blending amount of talc is less than 10 parts by mass, the mechanical strength such as rigidity may be inferior. If the rigidity is inferior, the accuracy of the sirocco fan is difficult to maintain, causing runout and resulting in loss of balance. There is a risk of vibration and noise during the operation of the sirocco fan. If the amount exceeds 40 parts by mass, the impact resistance may be reduced. If the impact resistance is reduced, during production, transportation, use or It is not preferable because it may be damaged during recycling.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the examples.
Example 1
The sirocco fan performance tester 20 shown in FIG. 5 was installed with the sirocco fan 1 shown in FIG. 1 to evaluate the performance.
In FIG. 5, reference numeral 21 denotes a test apparatus for installing and driving the sirocco fan 1. The drive shaft 17 of the drive motor (not shown) is inserted into the drive shaft hole 7 of the metal insert boss 8 (not shown) of the sirocco fan 1. The drive shaft 17 is fixed by screwing a fixing nut 18 to the tip of the drive shaft 17 by fitting. Reference numeral 22 denotes a hood, and 23 denotes a wind passage. The end of the wind passage 23 is connected to the side wall of a wind tunnel 25 having an on-off valve 24 installed at the top.
The wind tunnel 25 is provided with a pressure gauge 26 for measuring the internal pressure and an air flow meter 27 for measuring the air volume.
When a drive motor (not shown) is operated (power supply: AC 100 V, 50 Hz), the wing part 4 of the sirocco fan 1 rotates clockwise in the direction of the arrow shown in the drawing, and air is taken in from the outside and sent into the wind tunnel 25 through the air passage 23 to open and close The gas is discharged to the outside through the valve 24.
The on-off valve 24 was gradually opened from the fully closed state and changed to the fully opened state, and the soot pressure and air volume were measured.
The result is shown as a graph in FIG.
In the figure, (a) shows data when the sirocco fan 1 is operated with high strength, and (b) shows data when the sirocco fan 1 is operated with low strength.

(Comparative Example 1)
The performance was evaluated in the same manner as in Example 1 except that a metal sirocco fan having the same dimensions as the sirocco fan 1 shown in FIG. 1 was used, and the results are shown in a graph in FIG.

  It can be seen from FIG. 6 that the sirocco fan 1 has almost the same or slightly better performance than the metal sirocco fan.

(Example 2)
The sirocco fan 1 shown in FIG. 1 and the metal sirocco fan used in Comparative Example 1 are mounted on a range hood installed in a general household kitchen and operated for a certain period of time. The performance such as suction, noise, vibration, abnormal noise and durability was evaluated and compared.

(Evaluation results)
Suction: The degree of suction of steam, smoke, etc. rising from the cooking utensil applied to the range was visually determined. The sirocco fan 1 showed the same or slightly better suction than the metal sirocco fan.

  Noise: Judgment was mainly based on the sound of the wings cutting the wind. The sirocco fan 1 showed the same or slightly better silence than the metal sirocco fan.

  Vibration: Judgment was made based on vibration generated when the balance was lost due to runout. Sirocco fan 1 had almost no vibration due to its excellent balance compared to metal sirocco fan.

  Abnormal noise: Judgment was made based on the abnormal noise generated when the balance was lost due to, for example, runout of the core. The sirocco fan 1 has almost the same noise as the metal sirocco fan, or has a slightly better balance.

Durability: Judgment was made based on whether it was able to repeatedly withstand a large force generated at the time of starting, whether it was damaged by the centrifugal force applied to the blades during operation, or whether the performance deteriorated.
Since the sirocco fan 1 is a highly accurate and balanced sirocco fan, the load on the drive motor is reduced compared to a metal sirocco fan, and the sirocco fan 1 also has mechanical strength such as rigidity. Large enough, can repeatedly withstand the large force generated at start-up, is not damaged by the centrifugal force applied to the blades during operation, does not degrade performance, and reduces the occurrence of failure, superior to metal sirocco fans Showed high durability.

  The sirocco fan of the present invention solves the problem that the conventional metal sirocco fan has high material cost and manufacturing cost, requires a balancer and requires a lot of work time, has excellent strength and durability, and operates Occasionally there is no generation of vibration or noise, and the material can be easily recycled, and the metal insert boss that fits the drive shaft can be easily removed and recycled, making it friendly to both people and the global environment. In addition, the polyolefin resin composition is inexpensive and easy to obtain, and the sirocco fan can be easily and integrally produced with good processability and fluidity, with low density, acid resistance, alkali resistance, High oil resistance, excellent chemical resistance, excellent mechanical strength and durability, resistant to dirt when used in kitchens, etc. In clean can, be lightweight precision sirocco fan for having an appropriate stiffness retention, no runout, so a marked effect of such balance is not destroyed, high industrial value.

(A), (B), (C) is explanatory drawing explaining an example of the sirocco fan which is easy to recycle of this invention. (A)-(e) is explanatory drawing explaining the example of the other metal insert boss | hubs used for the sirocco fan which is easy to recycle of this invention. It is a block diagram which shows the conventional sirocco fan. It is a block diagram which shows the other conventional sirocco fan. It is explanatory drawing which shows the structure of a sirocco fan performance testing machine. It is a graph which shows the relationship between reed pressure and an air volume.

Explanation of symbols

H Depth W1, W2 Center of gravity 1 Sirocco fan 2 Disc-shaped base part 3 Wing 4 Wing part 5 Reinforcement ring 6 Recess 7 Drive shaft hole 8, 8A, 8B, 8C, 8D, 8E, 8F, 8G Metal insert boss 9 Contact surface 10, 10 </ b> A, 10 </ b> B, 10 </ b> C, 10 </ b> D Fixing / separating portions 11 to 13 Reinforcing rib 14 Support groove 15 Space 16 Center line 17 Drive shaft 18 Fixing nut

Claims (10)

A disc-shaped base portion provided with a metal insert boss having a concave portion in the central portion and a drive shaft hole fitted in the central portion of the concave portion, and a plurality of blades on the outer peripheral portion of the disc-shaped base portion A sirocco fan configured by integrally injection-molding a wing part formed into a cylindrical shape by combining the reinforcing ring provided at the end part of the wing with a polyolefin resin composition,
A fixing / separating portion that securely fixes the metal insert boss to the contact surface of the metal insert boss with the disk-shaped base portion during operation of the sirocco fan and can easily separate the metal insert boss during recycling. An easily recyclable sirocco fan using a metal insert boss formed integrally with the metal insert boss.   A plurality of the disk-shaped base portion, at least one of the surface on the wing portion side and the surface on the opposite side of the wing portion, radially outwardly with respect to the metal insert boss and perpendicular to the surface. The sirocco fan according to claim 1, further comprising a reinforcing rib.   The fixing / separating part is a plurality of convex fixing / separating parts formed in at least one part in the longitudinal direction of the metal insert boss parallel to the drive shaft, or made of the metal parallel to the drive shaft. The sirocco according to claim 1 or 2, wherein the insert boss is a plurality of concave fixing / separating portions formed in at least one part in the longitudinal direction of the insert boss, or a fixing / separating portion combining them. fan.   3. The sirocco fan according to claim 1, wherein the fixing / separating part is a reverse screw-like fixing / separating part formed in at least one part in the longitudinal direction of the metal insert boss.   A fixing / separating portion protruding outward at a right angle to the longitudinal direction of the metal insert boss is formed at the end portion on the side where the drive shaft is inserted and fitted into the drive shaft hole of the metal insert boss. 3. The sirocco fan according to claim 1, wherein the sirocco fan is formed integrally with an insert boss.   The sirocco fan is configured such that the center of gravity of the sirocco fan is on the center line of the drive shaft in the space inside the wing portion formed in a cylindrical shape, and at the position of the metal insert boss or in the vicinity of the metal insert boss. The sirocco fan according to any one of claims 1 to 5, wherein   7. The sirocco fan according to claim 6, wherein a metal insert boss formed using a metal having a large specific gravity is used.   The sirocco fan according to claim 7, wherein brass is used as the metal.   The sirocco fan according to any one of claims 1 to 8, wherein a polypropylene resin composition is used as the polyolefin resin composition.   The sirocco fan according to claim 9, wherein a polypropylene resin composition containing 60 to 90 parts by mass of polypropylene resin and 40 to 10 parts by mass of talc is used as the polypropylene resin composition.

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