JPS6014920B2 - blower impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to impellers of a blower, particularly those spaced apart from each other at right angles to the axis of rotation of the impeller, as commonly used in multiblade or cross-flow blowers. The present invention relates to an impeller comprising at least two substantially circular disks having a substantially circular shape, and a large number of elongated blades extending parallel to the rotational axis and attached to the outer periphery of the disks at equal intervals in the circumferential direction.

In order to attach the blades to the disk, the impeller of the above structure generally has a large number of openings that open on the outer periphery of the disk and are formed at equal intervals in the circumferential direction, and each blade is connected from the outside of the outer circumference of the disk in the radial direction of the entrance. After being inserted along the opening toward the inner end, the opening is closed in an appropriate manner and fixed in place.
When assembling the secondary impeller mentioned above, if the blades are only inserted into the opening □ of the disc, the blades are only loosely fitted with iron into the disc and the shape of the impeller cannot be maintained, so the opening □ is closed and the final It was necessary to use some type of fixture to maintain the predetermined shape of the impeller until the desired fixation was achieved.

In order to simplify the conventional assembly work that required such fixing devices, an impeller was proposed in Japanese Patent Publication No. 55-32919, in which the blades are already attached to the disk to some extent with the blades inserted into the closing opening. It is stated in the official gazette.

The impeller described in this publication is formed from a metal plate and has a large number of long and thin blades extending parallel to the axis of the impeller, and each blade is arranged at right angles to the axis of the impeller at intervals, and each blade is made of iron. at least two generally circular discs having a plurality of openings equally spaced circumferentially therefor, each opening opening into the outer periphery of the disc and extending radially inwardly therefrom. Each of the blades has a uniform cross-sectional shape over its entire length, except for the part that is fitted into the opening, and is curved in the middle direction, but is iron-fitted into the opening. The part has a cross-sectional shape that can be inserted into the opening by moving it from the outer circumference of the disc to the inner end thereof, and furthermore, each of said blades has a part that is iron-fitted in said opening. It has a channel-shaped fold that forms a narrow back wall that is recessed from the curved surface and extends in the direction of the blade, and two opposing side walls that extend parallel to each other at an angle on both sides of the back wall. The spacing between the holes is approximately equal to the thickness of the disc, and the thickness of the pleats is such that the pleats frictionally engage with the greens on both sides of the opening □ after inserting the vane into the closure, and The opposing side wall is configured to engage with both sides of the disc adjacent to the side edge of the entrance and hold the disc, and the channel-like shape formed in the blade is formed when the blade is merely inserted into the entrance of the disc. The opposing side walls of the pleats engage with both sides of the disc, thereby stopping the movement of the blade in the axial direction of the impeller, and the movement in the radial direction is restrained by friction between the pleats and the sekiguchi. Therefore, this impeller can maintain its assembled shape using the fixing device itself, but in order to give it enough rigidity to withstand external forces during use, it is of course necessary to close the entrance and fix each component in some way. . In order to fix the blades in the radial direction in the conventional impeller described above, a metal ring is attached around the disk and fixed by rolling, so that the entrance and radially outer edge of the disk are covered by the ring. What has been done is publicly known.

This coin stop device complicates assembly operations, increases assembly costs, and furthermore, the assembled ring occupies additional space in the radial direction, reducing the capacity of the impeller to be installed in a given space. Another known method is to roll the circumference of the disc itself after inserting the blades. This is because the radial thickness of the material in the disc that touches the side green of the blade becomes thinner due to rolling deformation, which cannot fix the blade permanently and loosens due to the forces acting during operation. It has a tendency to disappear. The present invention provides the impeller described in the above-mentioned Japanese Patent Publication No. 55-3291y with a special stop means that fits well to the impeller in order to securely and finally fix the impeller, thereby making it possible to consistently assemble the impeller. The purpose is to make the process easy to perform.

The mirror stop means of the present invention which achieves the above object is such that the circumferential green part of the disc on one side on the same side in the circumferential direction of all the openings is radially outward from the circumferential green part on the other side of each closed opening. a protrusion is formed on the outer periphery of the disk near the entrance of each checkpoint, and the protrusion is deformed inward to cross each closing port to close the entrance of the checkpoint and fix the blade in a predetermined position. It is characterized by being made to do.

Hereinafter, the present invention will be explained in detail with reference to the illustrated embodiments.

In the figure, reference numeral 1 indicates the entire impeller. The impeller 1 is suitable for a cross-flow blower, and as shown in FIG.
It is placed in the casing 2, and when rotated, it moves air in the direction of the arrow shown. The impeller 1 has a plurality of radially oriented discs 3.

The number of discs 3 is selected depending on the length of the impeller, and at least two discs are required, one at each end. The disc 3 is circular and is made by punching from a metal plate. The discs at both ends of the impeller are provided with a coupling hole 4 and a hub 5, as shown in FIG. Responsible for supporting and driving roles. The impeller has a plurality of elongated blades 6, which are arranged at equidistant and equal angles along the circumference of all the discs, and the greens 12 and 14 on both sides make an acute angle and an obtuse angle, respectively, with respect to the circumference of the disc. It is inserted into the closed checkpoint 7 and extends parallel to the axis of rotation. The blade 6 is also made by punching from a metal plate material, and has a cross-sectional shape that is uniformly curved over the entire length except for the part that is iron-fitted into the sekiguchi 7.
In the part where the iron is inserted, there are horizontal folds 8. These folds are formed by pressing the curved blades from the convex surface 9 to form a plurality of parallel back walls 10, as illustrated in FIGS. 3 to 7, and at the same time, as shown in FIG. , by forming two opposing side walls 11 on both sides thereof at an angle and extending parallel to each other in a direction perpendicular to the longitudinal direction of the blade. The inside of the back wall, measured in the longitudinal direction, is made to approximate the thickness of the disc at the position of the closing mouth 7, so that when the blade is inserted into the disc, the side green 12 on the 1 side of the entrance is as shown in Figure 8. tightly engage the bottom of the pleats, as shown in . In this embodiment, the back wall is made shorter than the inside of the blade (see FIG. 3), and opposing parallel side greens 13 are formed on the extension of the line of intersection between the back wall and the side wall of the pleat 8. A recess is provided. In the embodiment shown, the aperture 7 is in the form of a slot with a uniform interior, adapted to the thickness of the back wall 10, thus making the vanes perpendicular to the plane of the disc. When the disc 3 is inserted into the opening □ by moving it along the side edge of the opening □, the portion of the back wall 10 of the wing pleat 8 substantially fills the opening □ 7 and the portion of the opposite side wall 11 is adjacent to the side wall 12. It engages both sides of and holds it.

In order to prevent the blades from coming out of the opening □7, the shape of the cross section of the dorsal arm 10 taken along the longitudinal direction is slightly different from the shape of the parallel side edges 12 and 14 of the opening □7, as shown in the figure. The inside of the opening □ is made slightly larger than the thickness of the back wall. As a result, the vane is easily inserted into the opening, but
A tightening effect is exerted by frictional engagement between the first side green 12 of the opening □ and the center portion of the back wall, and between the opposite side line and both end greens of the back wall. A similar effect can be obtained by making the back wall flat and making the entrance curved. It is preferable to make the cross-sectional shape of the back wall and the shape of the opening slightly different, as shown in these two examples, in order to reliably prevent the blade from coming off before final fixing. The structure that holds both sides of the impeller maintains the assembled shape of the impeller and prevents the blades from coming off to some extent, so the cross-sectional shape of the back wall 10 matches the shape of the opening, and the back wall is completely closed. Both sides green 12,1
4, the object of the present invention can be sufficiently achieved. Therefore, the present invention includes all of these cases, and this relationship between the back wall and the opening is defined in the claims as follows: ``The thickness of the pleats is defined as the thickness of the pleats on both sides of the opening after inserting the blade into the opening.'' It is limited by the expression "thickness that frictionally engages with the edge". In order to make it easier to insert the blade, it is better to round the mouth of the Sekiguchi. The cross-sectional shape of the blade that engages with the closure where the blade and the disk are connected is such that the blade is inserted along the green side of the closure, and when housed in the closure, it acts in the scale line direction of the blade. It may be changed to another shape as long as it prevents it.

Two different arrangements are shown in Figures 10 and 11. In the first of these cases, the shape of the blade is deformed, and at the point of engagement with the disc, it is pressed both from the side of the convex surface 9 and from the side of the concave surface 16, so that the recessed part 17 has a length equal to the inside of the blade. In addition to the opposing side walls 11 on the convex side, each recessed portion also has two opposing side walls 18 on the concave side, which allow the lateral sides of the notch shown in the embodiments of FIGS. 13
A stabilizing effect similar to that obtained by the above method is obtained, but the strength at the disc-engaging portion of the vane is not compromised at all. 1st
The inside of the recessed part 17 in FIG. The retainers are adapted to engage these. With this construction, the blades are supported by the disc throughout their entire length, providing a bond that is well resistant to the bending experienced during operation. This configuration also has the advantage of reducing the strain forces applied to the metal plate when punching the metal plate to form the recess. This is because the part is deformed from both sides, so only a relatively small strain can be applied to a certain part. Of course, it is not necessary that the recess must be made of a single continuous wall. In the modification shown in FIG. 11, unlike the previous one, the outer end of the cross-section of the blade is not deformed by the shirring operation, and only the inner part has a structure similar to that in FIG. 10. .

Therefore, the outer portion of the tip of each closed opening is cut into the same shape as the concave shape of the blade, so that the blade closely contacts the side wall of the opening □. Regardless of the shape and mounting method chosen for the vane joint, once the vane has been inserted into the closure, it must be permanently secured to prevent movement of the vane from its position within the disc closure. There must be. For this purpose, in the present invention, a special shape is given to the circumference of the disk, especially the circumferential line on one side of the opening. One side of this closure is the same side of each opening □ when viewed in the circumferential direction, preferably the side where the opening □ forms an acute angle and intersects the periphery (in each of the illustrated embodiments, the opening (It is the counterclockwise side relative to B). This section is offset radially outwards compared to the opposite side, the offset being confined to the area of the mouth of the entrance, so that such offset twill of the closure forms a protrusion 21. In other words, the part that protrudes outward from the intersection of the circumference drawn by the radius of the green part on the opposite side and the closed part is the protruding part 21, and the one side green facing in the circumferential direction is the open □ side green 12. They are connected. The impeller according to the present invention is assembled as follows. That is, the disks 3 are placed side by side at right angles to the same axis line and at the same distance at a required interval, and by moving the blades 6 one by one in the direction perpendicular to the side green, the disks 3 are placed in the opening 7. When inserted, the back walls 10 of the pleats 8, which are provided at intervals equal to the above-mentioned required spacing across the vane, are woven just enough into the opening □7, and the inner ends of the pleats of the vane are closed. When it hits the bottom, the vane occupies a predetermined position. In this case, it is necessary that all the pleats 8 of the blade fit within the opening □. In the embodiment of FIG. 11, the correct position of the blade is that the concave portion of the blade is at the edge
This means that it hit number 9. A radially inward force is then applied to the protrusion 21 of the disc.

This is done by the well-known rolling method, that is, by moving the roller from the side with the protrusion 21 toward the opposite side of the opening (clockwise in the figure), the material of the disc on the side with the protrusion is gradually moved forward. Then, it is deformed inwardly and moved towards the mouth of the entrance so as to reach the back wall 10 inside the entrance. The material located radially inwardly of the projection is compressed and moved in a direction perpendicular to the back wall 10', sealing the outer end portion of the closure while the material forming the projection closes the closure. As a result, the outer periphery of the disk takes the shape shown by the solid line in FIG. 7 (the shape shown by the broken line in FIGS. 9 and 11). By giving the protrusion a suitable shape and size, the opening is completely closed and the resulting impeller disc has a substantially circular contour. In the case shown in FIGS. 7 and 9, the outer end of the back wall 10 is fixed by the deformed material from the protrusion 21, whereas in the case shown in FIG. 20 is crimped onto the convex portion of the outer end of the vane.

In either case, the impeller blades are permanently and firmly fixed in the correct position within the disk.

[Brief explanation of the drawing]

Figure 1 is a side view of the impeller of a cross-flow blower, and Figure 2 is a side view of the impeller of the crossflow blower.
FIGS. 3 and 4 are respectively a plan view and a partially sectional side view of one embodiment of the blade, and FIGS. 7 is a cross-sectional view of a part of an impeller assembled with the blades of the embodiment shown in FIGS. 3 to 6, and FIG. 8 is a sectional view taken along the leg-side line of the impeller in FIG. 7 to show the state of connection between the blade and the disk, and FIG. 9 is a partial sectional view of the impeller in FIG. 7, showing the disk according to the present invention. Figures 10 and 11 show two different examples of the blade, and Figure 11 shows the impeller before and after finishing, similar to Figure 9. The latter 5 states are shown. In the drawings, the correspondence between main parts and their symbols is as follows. 1 is an impeller, 2 is a casing, 3 is a disk, 6 is a blade, 7
is the opening, 8 is the fold, 9 is the convex surface, 10 is the back wall, 11 is the side wall, 12 is the 0 side green on one side, 13 is the side green of the defective part, 14
16 is a concave surface, 17 is a recessed portion, 18 is a side wall, and 21 is a protrusion. FIG. l FIG. 2 FIG. 3 FIG. MuFIG. 5 FIG. 6 FIG. 8 FIG. 10 FIG. 7 FIG. 9 FIG. 11

Claims (1)

[Scope of Claims] 1. A plurality of elongated blades extending parallel to the axis of an impeller formed from a metal plate, and spaced apart from each other at right angles to the axis of the impeller; at least two generally circular disks having a plurality of apertures equally spaced circumferentially therefor, each aperture opening into the outer periphery of the disk and extending radially inwardly therefrom. Each of the blades has a uniform cross-sectional shape over its entire length, except for the part fitted into the opening, and is curved in the width direction; however, the part fitted into the opening extends from the outer periphery of the disk. Each blade 6 has a cross-sectional shape that can be inserted into the opening by moving it along the opening to the inner end thereof, and each blade 6 is recessed from the curved surface at the portion to be fitted into the opening 7 so that the blade is It has a channel-shaped fold 8 forming a narrow back wall 10, 17 extending in the width direction and two opposing side walls 11, 18 extending parallel to each other at an angle on both sides thereof, and the two opposing side walls in the fold. The spacing between 11 and 18 is approximately equal to the thickness of the disk 3, and the thickness of the corrugations 8 is such that the corrugations 8 frictionally engage with both side edges of the aperture after inserting the blade into the aperture 7. In the impeller of the blower, the back walls 10, 17 and the opposing side walls 11, 18 are configured to engage and hold both sides of the disk 3 adjacent to the side edges of the opening,
The circumferential edge of the disk on one side that is circumferentially on the same side for all of the apertures 7 is offset radially outwardly from the circumferential edge on the other side of each aperture, such that the disk near the entrance of each aperture An impeller characterized in that a protruding part 21 is formed on the outer periphery of the impeller, and the protruding part is deformed inwardly so as to cross each opening to close the entrance of the opening and fix the blade in a predetermined position. 2. The blower impeller according to claim 1, wherein each of the openings is defined by a first side edge 12 and a second side edge 14 forming an acute angle and an obtuse angle with respect to the outer circumferential edge of the disc, respectively, in the radial direction. Said outer peripheral edge forming an outwardly offset protrusion 21 is placed on the side of the first side edge 12 of said opening, said protrusion 21 continuous with said first side edge and oriented in the circumferential direction. An impeller characterized by having a side edge.