JP2002130181A - Cross flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cross flow fan capable of ultrasonic welding by properly correcting the inclination even if a tip part of blades inclines. SOLUTION: In this cross flow fan integrally formed by mutually performing the ultrasonic welding by stacking a plurality of fan blocks 5 composed of a circular plate 3 forming plural circular arc-shaped guide grooves 2 in an almost radial shape on one side surface peripheral edge and plural circular arc-shaped blades 4 erected on the other side surface peripheral edge of the plate and having the tip joined to the guide grooves, a bottom surface of the guide grooves is inclined to either of the central direction or the outer peripheral direction of the plate, and since the tip part of the blades is inclined in response to an inclination of the bottom surface of the guide grooves, the ultrasonic welding can be performed by properly correcting the inclination by forming a shape after molding so that the tip part of the blades forcedly falls down outside or inside, excess labor at stacking time is not required, and a yield at molding time is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross flow fan, and more particularly to a shape of a welded portion of a fan block to be ultrasonically welded.

[0002]

2. Description of the Related Art As shown in a perspective view of a main part of FIG. 2 and a sectional side view of a main part of FIG. A fan formed of a circular plate 3 formed substantially radially and a plurality of arc-shaped blades 4 erected on the periphery of the other side surface of the plate 3 and having a tip 4a joined to the guide groove 2; The block 5 is formed by injection molding using a thermoplastic resin as a material. As shown in FIG. 1, a plurality of blocks 5 are stacked, and a plurality of arc-shaped guide grooves 2 are formed at the ends in a substantially radial shape. There is a case in which a circular end plate 3 ′ having the above is disposed and ultrasonically welded to each other to be integrally formed. However, since the fan block 5 is formed by injection molding, depending on molding conditions, cooling conditions, and the like, as shown in FIG. When the fan blocks 5 are stacked, as shown in FIG. 6, the tip 4a of the blade 4 is not fitted into the guide groove 2 and is displaced, so that it takes much time and effort to correct this. There was a problem. Also, in order to save this trouble, the blade 4
In order to form the front end portion 4a of the plate 3 so that it does not fall to the center side or the outside of the plate 3, a lot of molding techniques (for example, techniques relating to oil flowing, cooling water flowing, etc.) are required. This is a situation that must be sorted out, resulting in a poor yield.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and even if the tip of the blade is formed to be inclined at the time of molding, the inclination is appropriately corrected and ultrasonic welding is performed. The purpose is to provide a cross flow fan that can.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a circular plate having a plurality of arcuate guide grooves formed on the periphery of one side surface in a substantially radial manner, and another side surface of the plate. In a cross-flow fan formed by stacking a plurality of fan blocks each including a plurality of arc-shaped blades which are erected on a peripheral edge and whose leading ends are joined to the guide grooves, and are integrally formed by ultrasonic welding with each other, The cross flow fan is configured such that the bottom surface of the groove is inclined in either the center direction or the outer peripheral direction of the plate, and the tip of the blade is inclined corresponding to the inclination of the bottom surface of the guide groove.

[0005] A cross flow fan is formed in which the tip side of the blade is inclined in the outer peripheral direction or the central direction of the plate corresponding to the inclination of the bottom surface of the guide groove in the central direction or the outer peripheral direction of the plate. .

A cross flow fan is formed by projecting a back surface corresponding to the guide groove of the plate.

[0007] A cross-flow fan is provided in which a stopper is provided at the inclined lower end of the guide groove to stop the tip of the blade from sliding.

[0008] By providing a rib on one of the outer peripheral side and the center side of the joint portion between the blade and the plate of the blade, the tip side of the blade falls in the outer peripheral direction or the central direction of the plate during molding. The cross-flow fan is formed as follows.

By providing a hole or a groove on one of the outer peripheral side and the central side near the joint portion of the plate with the blade, the tip side of the blade is oriented in the outer peripheral direction or the central direction of the plate during molding. It is a cross flow fan that is formed to fall down.

After the ultrasonic welding, an annealing treatment is performed to remove the residual stress at the root of the blade, that is, at the joint with the plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cross flow fan according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a main part of a cross-flow fan according to the present invention as viewed from the front showing a manufacturing process thereof. FIG. 2 is a perspective view of a main part of a fan block showing an embodiment of a cross-flow fan according to the present invention. 4 is an enlarged sectional view of the main part, and FIG. 5 is a schematic view showing molding conditions. As shown in FIG.
First, a circular plate 3 formed by forming a plurality of arc-shaped guide grooves 2 having a margin 2a inside the one side surface in a substantially radial shape, and a plate 3 standing upright on the other side surface periphery of the plate 3 Is formed by injection molding using a thermoplastic resin as a material and a fan block 5 including a plurality of arc-shaped blades 4 joined to the guide groove 2. Next, as shown in FIG. 1, the fan block 5 is stacked with a plurality of tips 4a of the blades 4 fitted in the guide grooves 2, and ultrasonic vibration is applied from above the fan blocks 5, so that the bonding margin 2a is formed. The tip 4a of the blade 4 is melted and welded to the guide groove 2 to be integrally formed. By the way, in the case of the embodiment shown in FIG. 3, the guide groove 2 is inclined low toward the center of the plate 3, as shown in FIG. Then, the tip 4a of the blade 4 is moved to the plate 3 corresponding to the inclination of the guide groove 2.
It is inclined long toward the center. In this case, as shown in FIG. 5, for example, as shown in FIG. The portion 4a is formed to fall outward.

Further, in the case of the embodiment shown in FIG. 4, the guide groove 2 is inclined low in the outer peripheral direction of the plate 3 as shown in FIG. The tip 4a of the blade 4 is inclined long in the outer peripheral direction of the plate 3 corresponding to the inclination of the guide groove 2. In this case, as shown in FIG. 5, for example, as shown in FIG. 5, the cooling condition at the time of molding is such that a large number of pipes 7 through which cooling water flows are arranged inside the blade 4, and the inside is quickly cooled and shrunk, whereby the tip of the blade 4 is cooled. The part is formed to fall inward.

FIG. 6 is a sectional view of a main part of a fan block showing another embodiment of the cross flow fan according to the present invention.
In this embodiment, depending on the shape of the fan block 5, the tip portion 4a of the blade 4 falls outward or inward. In the case of FIG. 6 (a), a rib 4b is provided at the joint portion of the blade 4 with the plate 3, and the contraction of the rib 4b forcibly causes the tip 4a of the blade 4 to move.
To fall outward or inward. FIG. 6 (b)
In the case of (1), a hole or a groove 3a is formed in a joint portion of the plate 3 with the blade 4.

FIG. 7 is a sectional view of a main part of a fan block showing another embodiment of the cross flow fan according to the present invention.
In the present embodiment, the tip 4a of the blade 4 is formed so as to fall inward or outward in advance, and has a shape in which the back surface of the guide groove 2 is projected. In the case of FIG. 7 (a), the back surface of the guide groove 2 of the plate 3 is made to protrude with the outer peripheral side inclined downward, and the blade 4 is configured such that its tip 4a falls down. FIG.
In the case of (b), the back surface of the guide groove 2 of the plate 3 is made to protrude with the outer peripheral side inclined upward and the tip 4a of the blade 4 is tilted outward.

Next, the assembling procedure of the above configuration will be described. The embodiment of FIG. 3 will be described. The other embodiments are the same as those in the embodiment of FIG. 3 in consideration of the direction of inclination, and a description thereof will be omitted. A plurality of arc-shaped guide grooves 2 described in the conventional example are formed substantially radially, and a circular end plate 3 ′ having a rotation axis at the center is placed on the vibrating table 10 with the guide grooves 2 facing up. And a plurality of fan blocks 5 formed thereon such that the tip 4a of the blade 4 is fitted into the guide groove 2 so that the tip 4a of the blade 4 falls outward as shown in FIG. Stack up. At this time, the tip 4a of the blade 4 is guided inward along the slope of the guide groove 2, comes into contact with the stopper 6, and is fixed at a predetermined position. The fan block 5 is held down by the chuck 11, and the vibration horn 12 is put on the fan block 5. By applying ultrasonic vibration, the welding margin provided in the guide groove 2 is melted, and the tip 4 a of the blade 4 is removed. The cross flow fan 1 is completed by being welded to and integrated with the guide groove 2 of the plate 3.

[0016]

As described above, according to the crossflow fan according to the present invention, a circular plate having a plurality of arcuate guide grooves formed on the periphery of one side surface in a substantially radial manner, In a cross-flow fan formed by stacking a plurality of fan blocks each including a plurality of arc-shaped blades that are erected on the side surface periphery and whose tips are joined to the guide grooves and integrally formed by ultrasonic welding with each other, Since the bottom surface of the guide groove is inclined in either the center direction or the outer peripheral direction of the plate and the tip of the blade is inclined corresponding to the inclination of the bottom surface of the guide groove, the shape after molding is the same as that of the blade. The tip of the fork is formed so that it is forced to fall outward or inward, so that the inclination can be properly corrected and ultrasonic welding can be performed, saving unnecessary labor when stacking. Is possible, also, it is possible to provide a good cross-flow fan of the yield at the time of molding.

[Brief description of the drawings]

FIG. 1 is a main part plan view showing a manufacturing process of a cross flow fan according to the present invention as viewed from the front.

FIG. 2 is a perspective view of a main part of a fan block showing one embodiment of a cross flow fan according to the present invention.

FIG. 3 is an enlarged sectional view of a main part of a fan block showing an embodiment of a cross flow fan according to the present invention.

FIG. 4 is an enlarged sectional view of a main part of a fan block showing another embodiment of the cross flow fan according to the present invention.

FIG. 5 is a schematic view showing molding conditions of a fan block showing another embodiment of the cross flow fan according to the present invention.

FIG. 6 is a sectional view of a main part of a fan block showing another embodiment of the cross flow fan according to the present invention.

FIG. 7 is a cross-sectional view of a main part of a fan block showing another embodiment of the cross flow fan according to the present invention.

FIG. 8 is a sectional view of a main part showing a fan block of a conventional crossflow fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cross flow fan 2 Guide groove 2a Adhesive margin 3 Plate 3a Hole or groove 4 Blade 4a Tip 4b Rib 5 Fan block 6 Stopper 7 Pipe

Claims (7)

[Claims] 1. A circular plate in which a plurality of arc-shaped guide grooves are formed on a peripheral edge of one side surface in a substantially radial shape, and a plurality of plates are provided upright on the peripheral edge of the other side surface of the plate, and tips are joined to the guide grooves. A cross-flow fan formed by stacking a plurality of fan blocks each formed of an arc-shaped blade and ultrasonically welding them together, wherein the bottom surface of the guide groove is either in the center direction or in the outer circumferential direction of the plate. And a tip portion of the blade is inclined corresponding to an inclination of a bottom surface of the guide groove. 2. The blade according to claim 1, wherein a tip end side of the blade is formed so as to be inclined in an outer circumferential direction or a center direction of the plate corresponding to an inclination of a bottom surface of the guide groove in a center direction or an outer circumferential direction of the plate. The cross flow fan according to claim 1, wherein 3. The cross flow fan according to claim 1, wherein a back surface corresponding to the guide groove of the plate is protruded. 4. The cross flow fan according to claim 1, wherein a stopper is provided at an inclined lower end portion of the guide groove to stop the tip of the blade from slipping. 5. A rib is provided on one of an outer peripheral side and a central side of a joint portion between the blade and the plate of the blade, so that a tip end side of the blade is directed to an outer peripheral direction or a central direction of the plate during molding. 3. The cross flow fan according to claim 2, wherein the cross flow fan is formed to fall down. 6. A hole or a groove is provided on one of an outer peripheral side and a central side in the vicinity of a joint portion of the plate with the blade, so that a tip end side of the blade is formed in an outer peripheral direction or a center of the plate during molding. The cross flow fan according to claim 2, wherein the cross flow fan is formed so as to be inclined in the direction. 7. The cross flow according to claim 1, wherein an annealing process is performed after the ultrasonic welding to remove a residual stress at a root of the blade, that is, at a joint portion with the plate. fan.