JP2874631B2 - Cross-flow fan riblet molding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to Japanese Patent Application No. 7-33.
The present invention relates to a patent application based on the provisions of Article 41 (1) of the Patent Act of which the prior application is No. 6713, and, like the invention of the previous application, relates to a method for forming a riblet of a cross flow fan and an apparatus therefor. is there.

[0002]

2. Description of the Related Art Generally, as shown in FIGS. 7 and 8, a cross flow fan frequently used as a blowing means of an air conditioner has a plurality of partition plates 1, 1,. Are arranged in parallel with each other, and a plurality of blade pieces 2 are arranged in the circumferential direction between the partition plates 1. One fan body is formed between the partition plates 1 and 1 (that is, a row is formed). For example, one main body is formed by eight rows. As another type of cross flow fan, as shown in FIG. 9, there is a cross flow fan in which the blade pieces 2, 2,...

In the meantime, in the case of the cross flow fan configured as described above, there is a problem that turbulent frictional resistance is generated on the pressure surface of each of the blade pieces 2 during operation, and the operation noise is increased due to this.

[0004] In view of this, there has been proposed a method in which a large number of narrow grooves (hereinafter, referred to as riblets) extending in the direction along the air flow are formed on the pressure surface of each wing piece to reduce turbulent frictional resistance (for example, Japanese Patent Application Laid-Open Publication No. HEI 10-157556). And JP-A-7-40151).

The riblets have the following effect on the air flowing between the blade pieces.

That is, the air flowing between the blade pieces flows along the riblets, and the flow in the lateral direction (ie, in the direction of the rotation axis of the cross flow fan) is prevented. Therefore, a near-wall burst which occurs when a pair of longitudinal vortices rotating in opposite directions approaches each other in the viscous bottom layer of the boundary layer will be prematurely generated. As a result, the strength of the blower is reduced, and the duration thereof is also reduced, thereby reducing the turbulent frictional resistance.

[0007]

As a method of forming the riblets, there is a method in which a riblet forming pattern is formed in an injection molding die of a wing piece, and a riblet is formed simultaneously with the injection molding of the wing piece. Although a relatively short length such as a wing piece constituting one ream in a cross flow fan can be used practically, it is common to a large number of reams (for example, eight reams) in a cross flow fan. In the case of a long piece such as a wing piece, there is a problem that the size of the injection mold becomes large, and it is difficult to remove the mold because the pressure surface on which the riblets are formed has a concave shape.

The present invention has been made in view of the above points, and has as its object to enable a riblet to be easily and inexpensively formed even on a multi-unit long blade piece.

[0009]

According to a first method and apparatus of the present invention, as means for solving the above problems, there are provided:
In forming the riblets 3, 3,... On the pressure surface of the synthetic resin wing piece 2 constituting the cross flow fan, the synthetic resin is formed into a wing piece shape by injection molding or the like, and then heated to a semi-molten state. After transferring the riblets 3, 3,... Using the transfer means 12, or extruding the synthetic resin into a wing piece shape using the extruding means 11, the transfer is performed while it is in a semi-molten state in the same process. By transferring the riblets 3, 3,... Using the means 12, the riblets can be formed easily and at low cost.

In the first method and apparatus according to the present invention, the riblets 3, 3,... In the direction orthogonal to the longitudinal end face 2a of the wing piece 2 are transferred by the transfer pattern 21 parallel to the rotation axis of the transfer means 12. When formed, the blade pieces 2 are optimally arranged as the blade pieces 2 arranged in parallel with the rotation axis of the cross flow fan.

The transfer patterns 21 inclined at a predetermined angle with respect to the rotation axis of the transfer means 12 form riblets 3, 3... Inclined at a predetermined angle with respect to the longitudinal end surface 2a of the wing piece 2. In this case, the blade piece 2 is optimally arranged for the blade pieces 2 arranged to be twisted at a predetermined angle with respect to the rotation axis of the cross flow fan.

The first method and apparatus of the present invention described above (ie, the inventions described in claims 1 to 7) are disclosed in the specification and drawings of the previous application.

Further, the method and the apparatus for forming a riblet of a cross flow fan according to the invention of the present application are based on the newly added second method and apparatus described below (that is, the invention described in claims 8 to 18). )have.

In the second method and apparatus according to the present invention, as means for solving the above problems, riblets 3, 3,... Are formed on the pressure surface of the synthetic resin wing piece 2 constituting the cross flow fan. A method comprising:
The coating layer 4 made of a soft synthetic resin is formed on the surface of the substrate, and the coating layer 4 is made into a semi-molten state, and the riblets 3, 3,... Riblet molding is ensured.

In the second method and apparatus according to the present invention, the wing piece 2 and the coating layer 4 are simultaneously molded by two-color extrusion molding, and the transfer by the transfer means 12 is performed.
When applied in a semi-molten state after extrusion molding,
This is preferable in that riblet molding can be performed continuously with the molding of the wing pieces 2.

In the case where the wing piece 2 is formed by injection molding and the coating layer 4 is formed by forced skin layer formation at the time of injection molding, the coating layer 4
This is preferable in that the formation of is easy.

It is preferable that the coating layer 4 is formed on the pressure surface of the blade piece 2 in that the formation of the coating layer 4 can be minimized.

When the coating layer 4 covers the entire surface of the wing piece 2, the surface roughness of the wing piece 2 is greatly improved and burrs are reduced, so that aerodynamic resistance is greatly reduced. To improve.

The blade piece 2 is made of a synthetic resin containing a glass filler, and the coating layer 4 is
When the wing piece 2 is made of a natural layer made of the same synthetic resin as the wing piece 2, the adhesion between the coating layer 4 and the wing piece 2 is improved.

When riblets 3, 3,... Are formed in a direction perpendicular to the longitudinal end face 2a of the wing piece 2 by a transfer pattern 21 parallel to the rotation axis of the transfer means 12, the cross flow The blade pieces 2 are arranged optimally in parallel with the rotation axis of the fan.

Further, riblets 3, 3,... Inclined at a predetermined angle with respect to the longitudinal end surface 2a of the wing piece 2 are formed by the transfer pattern 21 inclined at a predetermined angle with respect to the rotation axis of the transfer means 12. In this case, the blade piece 2 is optimally arranged for the blade pieces 2 arranged to be twisted at a predetermined angle with respect to the rotation axis of the cross flow fan.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 and 2 show an apparatus used in a method for forming a riblet of a cross flow fan according to a first embodiment of the present invention.

As shown in FIG. 1, the riblet molding apparatus includes an extrusion molding means 11 for extruding a synthetic resin into a wing piece shape, and an extruded product 2 'extruded from the extrusion molding means 11 in the same step. , A transfer means 12 for transferring riblets 3, 3... While in a semi-molten state, a water-cooling cooling means 13 for cooling an extruded product 2 'passing through the transfer means 12, and a cooling means 13 And a cutting means 14 for cutting the extruded product 2 ′ to a predetermined size to form the blade piece 2. The cooling means 13 and the cutting means 14
Are not shown in detail because they are known.

The extruding means 11 comprises an extruder 15 for extruding a thermoplastic synthetic resin (for example, acrylonitrile styrene mixed with glass fiber) A in a molten state, and a molten synthetic resin extruded from the extruder 15. And an extrusion die 16 which is an extruded product 2 ′ in the shape of a wing piece.

The extruder 15 is heated (for example, 2
A screw shaft 18 for rotation in a sleeve 17 (about 00 ° C.), a synthetic resin supplied from a hopper (not shown) is melted, and a spinneret (not shown) is rotated by the rotation of the screw shaft 18. Through the cavity of the extrusion die 16 through the extrusion die 1
The extruded product 2 'is extruded continuously from 6.

The transfer means 12 is provided with the extrusion molding means 1.
The extruded product 2 ′ extruded from 1 is placed at a position where the extruded product 2 ′ is in a semi-molten state. The extruded product 2 ′ includes an embossing roll mold 19 and a guide roll 20 which are arranged to face each other across the extruded product 2 ′. It is configured. On the surface of the embossing roll mold 19, a transfer pattern 21 for forming a riblet is formed over the entire circumference. By the way, since the wing piece 2 is formed of a thin plate having a concave surface on the pressure surface side, the outer peripheral surface of the embossing roll mold 19 is made convex while the outer peripheral surface of the guide roll 20 is made It has a concave shape.

The embossing roll mold 19 and the guide roll 20 are rotated by driving means (for example, a motor with a speed reducer) 22, 23 (see FIG. 2) in a direction in which the extruded product 2 'is sent out. ing. Further, the embossing roll mold 19 is appropriately pressed against the guide roll 20 with a pressing force P by a pressing means (not shown).

As shown in FIGS. 2 and 3, the embossing roll mold 19 has a transfer pattern 21 as shown in FIG.
9a (in other words, the rotation axis of the transfer means 12) and the rotation axis 19 as shown in FIG.
a (in other words, the rotational axis of the transfer means 12) is inclined at a predetermined angle with respect to the transfer axis. That is, the embossing roll mold 1 shown in FIGS.
Reference numeral 9 denotes riblets 3, 3,... On the blade pieces 2 (see FIGS. 7 and 8) arranged in parallel to the rotation axis of the cross flow fan.
The embossing roll mold 19 shown in FIG. 5 is used to form the ribs 3, 3,... On the wing pieces 2 (see FIG. 9) arranged at a predetermined angle with respect to the rotation axis of the cross flow fan.・ It is used when forming.

Next, a procedure for forming a riblet on a blade piece for a cross flow fan using the above apparatus will be described in detail.

The molten synthetic resin extruded from the extruder 15 is supplied to an extrusion die 16 to form an extruded product 2 ′ in the shape of a blade.
And is supplied between the embossing roll mold 19 and the guide roll 20 in the transfer means 12 in a semi-molten state in the same step. Here, with the rotation of the embossing roll mold 19 and the guide roll 20, the transfer pattern 21 on the embossing roll mold 19 is transferred to the surface (in other words, concave surface) of the extruded product 2 '. Thereafter, the extruded product 2 ′ is cooled and hardened by the cooling means 13, and then cut into predetermined dimensions by the cutting means 14 to form the blade pieces 2.

As shown in FIG. 4, on the pressure surface (in other words, the concave surface) of the wing piece 2 obtained as described above, the triangular riblets 3, 3... Is formed, but as shown in FIG. 2 and FIG.
When an embossing roll mold 19 having a transfer pattern 21 having a shape parallel to the rotation axis of the transfer means 11 is used, the riblets 3, 3,... The blade pieces 2 obtained in this manner are formed in a direction perpendicular to the longitudinal side end face 2a, and the blade pieces 2 thus obtained are arranged in parallel to the rotation axis of the cross flow fan (see FIGS. 7 and 8). It will be optimal. On the other hand, as shown in FIG. 5, the transfer pattern 21 having a shape inclined at a predetermined angle with respect to the rotation axis 19a (in other words, the rotation axis of the transfer unit 11).
When the embossing roll mold 19 having the following is used, the riblets 3, 3,... Are formed at a predetermined angle with respect to the longitudinal end surface 2a of the wing piece 2, as shown in FIG.
The blade pieces 2 obtained in this manner are optimally arranged so as to be arranged at a predetermined angle with respect to the rotation axis of the cross flow fan (see FIG. 9). That is, in any case, the air flowing between the wing pieces 2, 2,.
3 and the flow in the lateral direction (that is, the direction of the axis of rotation of the cross flow fan) is prevented. Therefore, a near-wall burst which occurs when a pair of longitudinal vortices rotating in opposite directions approaches each other in the viscous bottom layer of the boundary layer will be prematurely generated. As a result, the strength of the blower is reduced, and the duration thereof is also reduced, thereby reducing the turbulent frictional resistance.

As another embodiment of the present invention, the wing piece 2 is molded in advance by injection molding of a synthetic resin or the like, and is heated to a semi-molten state. It is also possible to adopt a method of transferring riblets 3, 3,... To (ie, a concave surface) using transfer means 12 (ie, embossing roll mold 19) having the same configuration as that in FIG. According to such a method, since the shape accuracy of the wing piece 2 is improved as compared with the case of the extrusion molding described above, there is an advantage that it is not necessary to correct the shape of the wing piece 2 in a subsequent process.

The shape of the riblets is not limited to that described in the above embodiment, but may be any other shape as long as it has a narrow groove shape.

The embodiment described above (ie, claim 1)
(Embodiment of the invention according to claim 7) is disclosed in the specification and drawings of the previous application.

In the following, a newly added embodiment (that is, an embodiment according to claims 8 to 18) will be described.

Second Embodiment FIGS. 10 to 12 show an apparatus used in a method for forming a riblet of a cross flow fan according to a second embodiment of the present invention.

As shown in FIGS. 10 and 11, the riblet forming apparatus includes an extruding means 11 for extruding a synthetic resin into a wing piece shape, and an extruded product 2 'extruded from the extruding means 11. Transfer means 1 for transferring riblets 3, 3,... While in a semi-molten state in the same process
2, a water-cooled cooling means 13 for cooling the extruded product 2 'passed through the transfer means 12, and a cutting means for cutting the extruded product 2' passed through the cooling means 13 into predetermined dimensions to form the wings 2. 1
4 is provided. Since the cooling means 13 and the cutting means 14 are known, they are not shown in detail.

The extruding means 11 comprises an extruder 15A for extruding a molten thermoplastic glass fiber-containing synthetic resin (eg, acrylonitrile styrene, polypropylene, polypropylene oxide, etc. containing 30% glass fiber) AG, Extruder 1 for extruding a thermoplastic natural synthetic resin (for example, acrylonitrile styrene, polypropylene, polypropylene oxide, etc.) A
5B and a glass fiber-containing molten synthetic resin AG and a natural synthetic resin A extruded from the extruders 15A and 15B, and a wing-piece-shaped extruded product 2 'having a coating layer 4 made of the natural synthetic resin A on a pressure surface. Extrusion die 16
It is comprised including. The extruded product 2 '
Is about 0.8 mm, and the thickness of the coating layer 4 is about 0.1 mm.

The extruders 15A and 15B are extruded screw shafts 18A and 18B rotated in sleeves 17A and 17B in a heated state (for example, at about 200 ° C.).
The synthetic resin supplied from a hopper (not shown) is melted, and the screw shaft 18 is provided.
A and 18B are supplied to the cavity 16a in the extrusion die 16 through a base (not shown) by rotation of
An extruded product 2 ′ (having the coating layer 4 on the pressure surface) is continuously extruded from the extrusion die 16 by a color extrusion molding method.

The transfer means 12 is provided with the extruding means 1
The extruded product 2 ′ extruded from 1 is placed at a position where the extruded product 2 ′ is in a semi-molten state. It is configured. On the surface of the embossing roll mold 19, a transfer pattern 21 for forming a riblet is formed over the entire circumference. By the way, since the wing piece 2 is formed of a thin plate having a concave surface on the pressure surface side, the outer peripheral surface of the embossing roll mold 19 is made convex while the outer peripheral surface of the guide roll 20 is made It has a concave shape.

The embossing roll mold 19 and the guide roll 20 are rotated by driving means (for example, a motor with a speed reducer) 22, 23 (see FIG. 12) in a direction in which the extruded product 2 'is sent out. ing. Further, the embossing roll mold 19 is appropriately pressed against the guide roll 20 with a pressing force P by a pressing means (not shown).

As the embossing roll mold 19, the transfer pattern 21 has a shape parallel to the rotation axis 19a (in other words, the rotation axis of the transfer means 12) as shown in FIGS. As shown in FIG. 15, two types are prepared, one having a shape inclined at a predetermined angle with respect to the rotation shaft 19a (in other words, the rotation axis of the transfer means 12). That is, the embossing roll mold 19 shown in FIGS. 12 and 13 is used to form the riblets 3, 3,... On the blade pieces 2 (see FIGS. 7 and 8) arranged in parallel with the rotation axis of the cross flow fan. The embossing roll mold 19 shown in FIG. 15 is a blade piece 2 that is twisted and arranged at a predetermined angle with respect to the rotation axis of the cross flow fan (see FIG. 9).
Are used to form riblets 3, 3,...

Next, a procedure for forming a riblet on a blade piece for a cross flow fan using the above apparatus will be described in detail.

The molten synthetic resin AG containing glass fibers and the natural synthetic resin A extruded from the extruders 15A and 15B are supplied to an extrusion die 16 and have a wing-shaped shape having a coating layer 4 made of a natural synthetic resin on a pressure surface. It is continuously extruded as an extruded product 2 ', and in the same step, the embossing roll mold 19 in the transfer means 12 is in a semi-molten state.
And between the guide roll 20. Here, with the rotation of the embossing roll mold 19 and the guide roll 20, the transfer pattern 21 on the embossing roll mold 19 is transferred to the coating layer 4 of the extruded product 2 '. Thereafter, the extruded product 2 ′ is cooled and hardened by the cooling means 13, and then cut into predetermined dimensions by the cutting means 14 to form the blade pieces 2.

On the pressure surface (in other words, the concave surface) of the wing piece 2 obtained as described above, as shown in FIG. 14, riblets 3, 3... Are formed, but as shown in FIG. 12 and FIG.
9a (in other words, the rotation axis of the transfer unit 11) has an embossing roll mold 19 having a transfer pattern 21 having a shape parallel to the transfer pattern.
When ribs 3 and 3 are used, as shown in FIG.
Are formed in a direction orthogonal to the longitudinal end surface 2a of the blade piece 2, and the blade pieces 2 obtained in this manner are arranged in parallel to the rotation axis of the cross flow fan (FIG. 7 and FIG. 8). On the other hand, FIG.
5, the rotation shaft 19a (in other words, the transfer unit 1)
When using an embossing roll mold 19 having a transfer pattern 21 having a shape inclined at a predetermined angle with respect to the center of one rotation axis), the riblets 3, 3,... The blade pieces 2 thus obtained are inclined at a predetermined angle with respect to the rotation axis of the cross flow fan (see FIG. 9). It will be the best. That is, in each case, the air flowing between the blade pieces 2, 2,... Flows along the riblets 3, 3,... And the air flows in the lateral direction (that is, in the direction of the rotation axis of the cross flow fan). Will be blocked. Therefore, a near-wall burst which occurs when a pair of longitudinal vortices rotating in opposite directions approaches each other in the viscous bottom layer of the boundary layer will be prematurely generated. As a result, the strength of the blow-down is reduced,
Its duration will also be reduced, reducing turbulent frictional resistance.

The depth of the valleys of the riblets 3, 3,... Is preferably equal to the thickness of the coating layer 4 in order to ensure the formation of the riblets.

When the transfer pattern 21 of the embossing roll 19 is transferred to the coating layer 4 formed on the pressure surface of the blade piece 2 (in other words, the extruded product 2 ') as described above, the glass Wing piece 2 made of fiber-containing synthetic resin AG
(In other words, in the case of transferring to the extruded product 2 ') itself, the riblets 3, 3 transferred due to the presence of glass fibers
Could be restored, but since the coating layer 4 as the transfer portion is made of a natural synthetic resin, there is no such danger, and the formation of the riblets 3, 3. Can be performed.

By the way, the wing piece 2 is preliminarily formed by injection molding of a synthetic resin or the like, and is heated to a semi-molten state. Then, the pressure surface (that is, the concave surface) of the wing piece 2 is It is also possible to adopt a method of transferring the riblets 3, 3,... Using the transfer means 12 having the same configuration (that is, the embossing roll mold 19). In this case, the coating layer 4 is formed by forced skin layer molding in which the injection mold is heated to a temperature higher than usual and injection molded. According to such a method, since the shape accuracy of the wing piece 2 is improved as compared with the case of the extrusion molding described above, there is an advantage that it is not necessary to correct the shape of the wing piece 2 in a subsequent process.

The shape of the riblet is not limited to that described in the above embodiment, but may be any other shape as long as it has a narrow groove shape.

In this embodiment, the coating layer 4
Although the wing piece 2 and the wing piece 2 are made of the same synthetic resin, they may be made of different synthetic resins.

Third Embodiment FIGS. 17 and 18 show an apparatus used in a riblet molding method for a cross flow fan according to a third embodiment of the present invention.

In this case, the coating layer 4 for covering the entire surface of the extruded product 2 'is formed in the cavity 16a of the extrusion die 16 in the extrusion molding means 11.
Therefore, the molded wing piece 2 has the entire surface covered with the coating layer 4, and there is no contact between the extrusion die 16 and the glass fiber during molding, and the fluidity of the resin is improved. The roughness is greatly improved, and burrs are reduced. Therefore, it is extremely advantageous in terms of aerodynamic performance, and in the case of a cross flow fan using the same, drastic reduction in operating noise can be achieved.

The other configuration, operation, and effect are the same as those in the second embodiment, and the description is omitted.

Also in this case, the wing piece 2 is formed in advance by injection molding of a synthetic resin or the like, and is heated to a semi-molten state. It is also possible to adopt a method of transferring the riblets 3, 3,... Using the transfer means 12 having the configuration (that is, the embossing roll mold 19). In this case, the coating layer 4 is formed by forced skin layer molding in which the injection mold is heated to a temperature higher than usual and injection molded. According to such a method, since the shape accuracy of the wing piece 2 is improved as compared with the case of the extrusion molding described above, there is an advantage that it is not necessary to correct the shape of the wing piece 2 in a subsequent process.

The shape of the riblet is not limited to that described in the above embodiment, but may be any other shape as long as it has a narrow groove shape.

In the present embodiment, the coating layer 4
Although the wing piece 2 and the wing piece 2 are made of the same synthetic resin, they may be made of different synthetic resins.

[0058]

According to the first method and apparatus of the present invention, a synthetic resin wing piece 2 constituting a cross flow fan is provided.
In forming the riblets 3, 3,... On the pressure surface in step 1, the synthetic resin is molded into a wing piece shape by injection molding or the like, and then heated to a semi-molten state, and the riblets 3, 3,. After transferring or extruding a synthetic resin into a wing piece shape using the extrusion molding means 11,
During the semi-molten state in the same process, the transfer means 12
Are used to transfer the riblets 3, 3,..., So that there is an excellent effect that the riblets can be easily formed at low cost.

When the synthetic resin is molded into a wing piece shape by injection molding or the like and then heated to a semi-molten state to transfer the riblets 3, 3,... Since the shape accuracy of the piece 2 is improved as compared with the case of the extrusion molding described above, the wing piece 2
This is advantageous in that it is not necessary to modify the shape of.

On the other hand, after the synthetic resin is extruded into the shape of a wing piece using the extrusion means 11, the transfer means 12 uses the transfer means 12 while the resin is in a semi-molten state in the same step.
When 3 is transferred, riblet molding can be performed simultaneously with extrusion of the wing pieces,
This is advantageous in that the process can be simplified.

The effects of the first method and apparatus of the present invention described above (that is, the inventions described in claims 1 to 7) are those disclosed in the specification and drawings of the previous application. is there.

Further, the second method and apparatus according to the present invention (ie, the invention described in claims 8 to 18)
Has the newly added effects described below.

According to the second method and apparatus of the present invention, the synthetic resin blade piece 2 constituting the cross flow fan
Forming a coating layer 4 made of a soft synthetic resin on the surface of the wing piece 2 and forming the coating layer 4 in a semi-molten state. Since the riblets 3, 3,... Are transferred by using the rib 12, the excellent effect that the riblet molding can be performed easily and reliably at low cost and the material strength of the wing piece 2 is not reduced. There is.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a riblet forming apparatus of a cross flow fan according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view of a transfer means (transfer means for forming a riblet perpendicular to a longitudinal end surface of a wing piece) in the crossflow fan riblet forming apparatus according to the first embodiment of the present invention. .

FIG. 3 is a partially enlarged plan view of a wing piece having riblets transferred by a transfer unit shown in FIG. 2;

FIG. 4 is an enlarged cross-sectional view showing a shape of a riblet formed by a riblet forming method of the cross flow fan according to the first embodiment of the present invention.

FIG. 5 is an enlarged view of a transfer means (transfer means for forming a riblet inclined at a predetermined angle with respect to the longitudinal end surface of the blade piece) in the crossflow fan riblet forming apparatus according to the first embodiment of the present invention; It is a front view.

FIG. 6 is an enlarged plan view of a wing piece having riblets transferred by the transfer unit shown in FIG. 5;

FIG. 7 is a front view of a cross flow fan having a plurality of blade pieces parallel to a rotation axis.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a front view of a cross flow fan having a plurality of blade pieces that are twisted by a predetermined amount with respect to a rotation axis.

FIG. 10 is a schematic configuration diagram showing the configuration of a cross-flow fan riblet forming apparatus according to a second embodiment of the present invention.

FIG. 11 is a cross-sectional view of an extrusion die in a cross-flow fan riblet forming apparatus according to a second embodiment of the present invention.

FIG. 12 is an enlarged front view of a transfer means (transfer means for forming a riblet perpendicular to a longitudinal end surface of a blade piece) in a crossflow fan riblet forming apparatus according to a second embodiment of the present invention. .

FIG. 13 is a partially enlarged plan view of a wing piece having riblets transferred by the transfer unit shown in FIG. 12;

FIG. 14 is an enlarged cross-sectional view showing a shape of a riblet formed by a riblet forming method of the cross flow fan according to the second embodiment of the present invention.

FIG. 15 is an enlarged view of a transfer means (transfer means for forming a riblet inclined at a predetermined angle with respect to the longitudinal end surface of the wing piece) in the crossflow fan riblet forming apparatus according to the second embodiment of the present invention. It is a front view.

16 is an enlarged plan view of a wing piece having riblets transferred by the transfer unit shown in FIG.

FIG. 17 is a schematic configuration diagram illustrating a configuration of a cross-flow fan riblet forming apparatus according to a third embodiment of the present invention.

FIG. 18 is a cross-sectional view of an extrusion die in a riblet forming apparatus of a cross flow fan according to a third embodiment of the present invention.

[Explanation of symbols]

2 is a blade piece, 2a is a longitudinal end face, 2 'is an extruded product, 3 is a riblet, 4 is a coating layer, 11 is an extruding means, 12 is a transfer means, 15, 15A and 15B are extruders, and 16 is an extruder. The mold, 19 is an emboss roll type, 19a is a rotating shaft, 20 is a guide roll, 21 is a transfer pattern, AG is a synthetic resin containing glass fiber, and A is a natural synthetic resin.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-199697 (JP, A) JP-A-62-279297 (JP, A) JP-A-7-40151 (JP, A) JP-A 64-64 18628 (JP, A) JP-A-6-195757 (JP, A) JP-A-3-79909 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04D 29 / 18-29 / 38

Claims (18)

(57) [Claims] 1. A pressure plate of a synthetic resin blade piece (2) constituting a cross flow fan has riblets (3),
(3) is a method of forming a synthetic resin into a wing piece shape, heating it to a semi-molten state, and using a transfer means (12) to transfer riblets (3), (3). · A riblet molding method for a cross flow fan, characterized by transferring 2. A synthetic resin wing piece (2) constituting a cross flow fan has riblets (3),
(3) is a method of forming a synthetic resin into a wing piece shape, and then using a transfer means (12) while transferring the riblet (3),
(3) A method for forming a riblet of a cross flow fan, characterized by transferring 3. The riblets (3), (3)... Are formed in a direction orthogonal to a longitudinal end face (2a) of the wing piece (2). The method for forming a riblet of a cross flow fan according to any one of the preceding claims. 4. The riblets (3), (3)... Are formed so as to be inclined at a predetermined angle with respect to a longitudinal end surface (2a) of the wing piece (2). A method for forming a riblet of a cross flow fan according to claim 2. 5. A riblet (3) on a pressure surface of a synthetic resin blade (2) constituting a cross flow fan.
(3) An apparatus for extruding a synthetic resin into a wing piece shape, and an extruded product (2 ′) extruded from the extrusion means (11). A transfer device (12) for transferring riblets (3), (3),... While in a semi-molten state. 6. The cross-flow fan according to claim 5, wherein the transfer pattern (21) in the transfer means (12) is parallel to the rotation axis of the transfer means (11). Riblet molding equipment. 7. The cloth according to claim 5, wherein the transfer pattern (21) in the transfer means (12) is inclined at a predetermined angle with respect to the rotation axis of the transfer means (12). Flow fan riblet molding equipment. 8. A pressure member of a synthetic resin blade piece (2) constituting a cross flow fan has riblets (3),
Forming a coating layer (4) made of a soft synthetic resin on the surface of the wing piece (2) and transferring the coating layer (4) in a semi-molten state. A riblet molding method for a cross flow fan, wherein the riblets (3) are transferred using the means (12). 9. The wing piece (2) and the coating layer (4)
9. The cross-flow fan according to claim 8, wherein the molding is performed simultaneously by color extrusion, and the transfer by the transfer means is performed in a semi-molten state after the extrusion. Riblet molding method. 10. The wing piece (2) is to be formed by injection molding, and the coating layer (4) is to be formed by forced skin layer molding at the time of injection molding. The method for forming a riblet of a cross flow fan according to claim 8, wherein: 11. The wing piece (2), wherein the coating layer (4) is provided.
The method according to any one of claims 8 to 10, wherein the rib is formed on a pressure surface of the cross flow fan. 12. The wing piece (2), wherein the coating layer (4) is
11. The method according to claim 8, wherein the entire surface of the cross-flow fan is covered. 12. 13. The wing piece (2) is made of a synthetic resin containing a glass filler, and the coating layer (4) is a natural layer made of the same synthetic resin as the wing piece (2). The method for forming a crosslet fan riblet according to any one of claims 8 to 12, characterized in that: 14. The riblets (3), (3)... Are formed in a direction orthogonal to a longitudinal end face (2a) of the wing piece (2).
The method for forming a riblet of a cross flow fan according to any one of the preceding claims. 15. The riblets (3), (3)... Are formed to be inclined at a predetermined angle with respect to a longitudinal end surface (2a) of the wing piece (2). A method for forming a riblet of a cross flow fan according to claim 13. 16. A synthetic resin wing piece (2) constituting a cross flow fan has riblets (3),
(3) ... an extruding means (11) for forming a coating layer (4) made of a soft synthetic resin on the surface of the synthetic resin while extruding the synthetic resin into a wing piece shape; Extruded product (2 ') extruded from molding means (11)
Transfer means (1) for transferring riblets (3), (3),... To the coating layer (4) while is in a semi-molten state.
2) A riblet forming apparatus for a cross flow fan, comprising: 17. The cross-flow fan according to claim 16, wherein the transfer pattern (21) in the transfer means (12) is parallel to the rotation axis of the transfer means (11). Riblet molding equipment. 18. The cloth according to claim 16, wherein the transfer pattern (21) in the transfer means (12) is inclined at a predetermined angle with respect to the rotation axis of the transfer means (12). Flow fan riblet molding equipment.