JPH01163497A - Impeller made of fiber reinforced plastics - Google Patents

Abstract

PURPOSE:To improve manufacturing and processing efficiency without requirement on formation of a mounting unit having a stopper with bolt and nut on each blade by forming recessed grooves on a main plate and a side plate so as to fitting and fix each blade in each recessed groove with a binder. CONSTITUTION:Respective components like a main plate 1, a side plate 2, blades 3 and so on are formed by a fibre reinforced plastic material. On the main plate 1 and the side plate 2, the recessed grooves 11, 21 for inserting the blades are formed on the positions corresponding to the blade mounting parts on the outer circumference parts thereof. The fitting parts 31, 31 corresponding to the recessed grooves 11, 21 are formed on both ends of the blades 3. Notches 32 for preventing their falling off are formed as occasion demands on one or both of the side parts of these fitting parts 31.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fiber-reinforced plastic impeller, particularly to a fiber-reinforced plastic impeller useful for use in multi-blade fans.

Conventionally, as fiber-reinforced plastic impellers for multi-blade fans, fiber-reinforced plastic molded materials are used to mold U-shaped blades that have a main plate, a side plate, and attachment parts for the plates at both ends. At the attachment parts at both ends, the main plate and side plates are bonded with adhesive using bolt-nut tightening means, and overlay treatment is applied to these attachment parts using the same molded material. Structures that can be used as products are known. Figure 1 shows the blade in the conventional product, and Figure 2 shows how the blade is attached to the main plate and side plate. In the figure, (a) is the main plate, (b) is the side plate, and (C) is a blade, (d) is a mounting part formed at both ends of the blade, (e) is a bolt/nut, (f) is an overlay part, (g) is an adhesive layer, and the overlay part (f) is an adhesive layer that strengthens the adhesive strength. and bolt nuts (e) are formed for the purpose of corrosion prevention.

However, with such a conventional structure, the blade has a complicated U-shaped shape, which requires a lot of work to manufacture and process. Attaching the blade using bolts and nuts involves drilling holes (for bolt insertion), adhering the blade attachment part to the main plate and side plates using adhesive, tightening the main plate and side plates, and overlaying the attachment part, which is extremely complicated. In particular, adhering the blade attachment part to the main plate and side plate is quite difficult because the blade attachment part does not have the specified dimensional accuracy due to "sink marks" after molding, and production becomes inefficient. There was a problem. In addition, it is impossible to expect the precision of the attachment part of the blade to meet the specified dimensions due to "sink marks" after molding, and there is usually a gap between the adhesive surface of the attachment part and the adhesive surfaces of the main plate and side plate. This creates gaps that cause poor adhesion. In order to eliminate such gaps, bolts and nuts are tightened, but it is difficult to completely eliminate such gaps even by tightening bolts and nuts, and it is inevitable that some parts will have poor adhesion. This has the disadvantage that adhesive strength is unreliable, and the weight balance is poor due to excess or deficiency of overlay, which tends to lead to decreased performance and uneven quality.

In addition, from a performance standpoint, this type of impeller has the advantage of having a large number of blades, but with conventional impellers, as the number of blades used increases, the distance between the blades becomes narrower. Bolting and overlaying were no longer possible, and the number of blades that could be used was severely restricted, resulting in inferior performance compared to metal blades that were not subject to such restrictions. Furthermore, in manufacturing small-diameter impellers, the gap between the blades becomes narrow, making it difficult to insert tools or hands into this gap, making manufacturing difficult.

The present invention has been made with the aim of eliminating all of these conventional problems. Specifically, the present invention has been made with the main plate and side plates made of fiber-reinforced plastic, and the blades are inserted at positions corresponding to the blade attachments on the outer periphery. Using a blade made of fiber-reinforced plastic and having insertion parts for the groove on both ends, insert the required number of blades into the groove of the main plate (or side plate) at one end. At the same time, the inserted blade is completely fixed in the groove by curing the resin bonding material filled before or after the blade is inserted, and then the blade is inserted into the main plate. Each blade that has been inserted and fixed is inserted into the groove of the side plate (or main plate) at the insertion part at the other end, and the inserted blade is inserted into the groove before or after insertion. This invention relates to a fiber-reinforced plastic impeller in which the main plate, side plates, and blades are integrally bonded by being completely fixed by curing the filled resin bonding material.

An embodiment of the present invention will be described below based on the accompanying drawings.

Figure 3 shows an example of the main plate (1), side plate (2), and blade (3) which are the constituent elements of the impeller of the present invention, and each of these constituent parts is made of fiber-reinforced plastic material as in the past. , is molded by applying a conventionally known appropriate molding means.

The main plate (1) and side plate (2) used in the impeller of the present invention have grooves (11) and (21) for inserting the blades formed in the outer circumferential portion thereof at positions corresponding to the blade attachment. When obtaining an impeller for a multi-blade fan as shown in Figs. 3 to 9, such grooves (11) and (21) should be formed continuously in the circumferential direction as shown in the figures. is preferable, but for example, the first
When obtaining impellers for a turbo fan as shown in FIGS. 0 and 11, they may be formed independently at positions corresponding to the attachment of the impellers. In FIGS. 10 and 11, (1') is the main plate, (2') is the side plate, (3') is the blade, and (21') is the groove in the side plate. The depth of the concave grooves (11) and (21) is not particularly limited and is determined appropriately according to the dimensions of the impeller, etc., but usually the depth is about 1 to 5 times the thickness of the blade (3). It is sufficient.

The blade (3) has insertion parts (31) (31) for the grooves (11) and (21) at both ends, and the insertion parts (31)
) can be formed with a notch (32) on one or both of the sides to prevent it from coming off, if necessary. The notch (32) is omitted in FIG. 3a. The cross-sectional shape of the blade (3) is similar to the conventional blade of this type, and FIG. 3a shows one having an arcuate cross-section. Such a feather (3) is
For example, it can be easily obtained by molding a long product having the same cross-sectional shape and cutting it into a predetermined size. Feather (
The surface of the insertion part (31) in 3) can be roughened for the purpose of improving adhesiveness.

FIGS. 4 to 9 are explanatory diagrams showing an example of the manufacturing method of the impeller of the present invention in the order of steps. As shown in FIG. Resin-based bonding material (4
). The bonding material (4) is not particularly limited as long as it can bond and integrate the blade (3) and the main plate (1), but it is usually a resin of the same type as the molding material of the blade (3) and the main plate (1). A resin-based bonding material is used as the main component. Such bonding materials include those whose main component is a thermosetting resin, such as an unsaturated polyester resin, to which a hardening agent and a crack-preventing material (such as glass powder, calcium carbonate, shirasu balloon, etc.) are added. I can give an example. A thickener (for example, Aerosil (trademark, manufactured by Nippon Aerosil Co., Ltd.)) can be added to such a resin-based bonding material for the purpose of adjusting the viscosity, if necessary. Such viscosity adjustment can be done, for example, by using a side plate (2') as shown in FIG.
) is necessary to prevent the bonding material from flowing out from inside the groove (21') when the groove (21') is formed on the slope (2a') of the groove (2a'). By adding a thickener, the viscosity is adjusted to a level that does not cause it to run out.

As shown in FIG. The blades are constructed by inserting them in sequence into the grooves (11). In this case, in order to improve the compatibility between the insertion part (31) and the bonding material (4), the surface of the insertion part (31) to be adhered may be pretreated with a bonding material to provide a wet surface. .

Providing this wetted surface is particularly useful when the bonding material (4) has a high viscosity. As shown in FIG. 5, the jig (5) has a central axis (5a) and two upper and lower disk parts (5b) (5b) extending outward from the axis (5a), A large number of insertion holes (5) for inserting and supporting the blades are provided on the outer periphery of the disk portions (5b) (5b) in the same positional relationship as the installation position of the blades (3).
c)... is formed. This insertion hole (5c)...
・The formation situation is shown in FIG. 6 (a plan view of FIG. 5). Figure 6a shows the relationship between the insertion hole (5c) and the blade (3) inserted and supported by the insertion hole (5c). has been done.

While maintaining the state shown in Figure 5, the bonding material (4
) is cured and the blade (3) and main plate (1) are joined and integrated, and then the jig (5) is pulled out in both directions to obtain an intermediate product (A) as shown in Figure 7. .

In this intermediate product (A), each blade (3) is completely fixed at the insertion part (31) at one end by the bonding material (4), so after the jig is removed, Also, the dimensional accuracy (inter-wing spacing and perpendicularity, etc.) when applying the jig is maintained as is.

Next, the groove (21) of the side plate (2) is filled with the bonding material (4) in the same manner as in the case of the main plate (1), and the groove (21) filled with the bonding material is filled with the bonding material (4).
1), as shown in Figures 8 and 9, by inserting the lower end insertion part (31) of each blade (3) of the intermediate product (A), and then curing the bonding material (4). As shown in FIG. 9, the impeller (B) of the present invention is obtained.

In the above manufacturing example, a case was explained in which the bonding material (4) was filled into the grooves (11) and (21) before the blades (3) were inserted. is a feather (3
) may be performed after the insertion.

In this way, in the impeller of the present invention, grooves are formed in the main plate and the side plates, and the blades can be inserted and fixed in the grooves using a bonding material, thereby forming a mounting portion for bolts and nuts to the blades. Since this is no longer necessary, the shape of the blade can be simplified and manufacturing efficiency can be improved, and since bolt and nut fastening is not required, complicated processes such as forming bolt and nut holes and overlaying the bolt and nut fastening parts are no longer necessary. Overall productivity can be significantly improved.

Furthermore, since there is no need for bolt-nut fixing or overlay treatment of bolt-nut fixing parts, there are no restrictions on the size of the spacing between the blades or the number of blades that can be used, resulting in a product with the same high performance as a metal product. In addition to being easy to manufacture, even small-diameter impellers, which were difficult to manufacture with conventional fiber-reinforced plastic impellers, can be easily manufactured.

Furthermore, since the present invention eliminates the overlay process that caused uneven weight balance of the product, it is possible to improve the quality accordingly, and also eliminates the cause of adhesion failures seen in conventional products. We can provide high quality and reliable products.

In this way, the present invention enables manufacturing of high-quality, high-performance, and highly reliable products with high productivity, and in particular, it is possible to manufacture relatively small blades on the outer periphery of the main plate and side plates. Particularly useful are multi-blade fan impellers that have multiple spaced apart impellers.

In the present invention, the fiber-reinforced plastic molding material includes:
Although there are no particular limitations, from the viewpoint of strength and economy, those whose main component is a thermosetting resin such as unsaturated polyester, epoxy resin, phenol resin, furan resin, etc. can be advantageously used. Further, as the reinforcing fibers, matt or cross-shaped glass fibers, carbon fibers, etc. can be advantageously used.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the shape of the blades of a conventional impeller;
The figure is an exploded vertical cross-sectional view of essential parts showing how the blades are installed in a conventional impeller, Figure 3 is an explanatory diagram showing an example of each component of the impeller of the present invention, and Figure 3a is the slope of the blade. 4 to 9 are explanatory diagrams showing an example of the manufacturing method of the impeller of the present invention in the order of steps, FIG. 10 is a perspective view showing an example of the components of a turbo fan, and FIG. 11 is a side plate of the FIG. In the figure, (1) is the main plate, (11) is its groove, (2)
is the side plate, (21) is its groove, (3) is the blade, (31)
is the insertion part, (4) is the bonding material, and (5) is the jig. (Above) Figure 2 Figure 3 α Figure 4 Figure 5 Figure 10 Figure 11 Figure 2 (IL' Procedural amendment blind motion type) Indication of the case 1988 Patent Application No. 292908 2 Name of the invention Textile Reinforced plastic impeller 3 Relationship with the case of the person making the amendment Patent applicant Seiko Kakoki Co., Ltd. 4 Agent 5. ';Jiunno August 30, 1988 6 Contents of amendment to the "Title of the Invention" section in the specification subject to amendment 1 The "Title of the Invention" section in the specification is changed to "Fiber-reinforced plastic impeller" correct. (Above) Procedural correctness (method) February 7, 1999 1 Indication of the case Patent Application No. 292908 of 1988 2 Name of the invention Seiko Kakoki Co., Ltd. 4 Agent 2 Hirano-cho, Higashi-ku, Osaka City 10 Sawanotsuru Building January 3, 1999
1st day 6 Contents of amendment subject to amendment 1 The statement ``Figures 4 to 9'' in page 13, line 17 of the specification is corrected as follows. "Figure 4, Figure 5, Figure 6, Figure 6 a1 Figure 7, Figure 8, and Figure 9" (and above)

Claims (1)

[Claims] (1) The main plate and side plates are made of fiber-reinforced plastic and have grooves for inserting the blades at the positions corresponding to the blade attachment on the outer periphery, and the blades are made of fiber-reinforced plastic and inserted into the grooves at both ends. Using a blade with a fitting part, insert the required number of blades into the groove of the main plate (or side plate) at the insertion part at one end, and then insert the inserted blades into the groove. On the other hand, the blades are completely fixed by hardening of the resin-based bonding material filled before or after insertion, and each blade inserted and fixed on the main plate is attached to the side plate (or main plate) at the insertion part at the other end. The inserted blade is completely fixed by curing the resin bonding material filled in the groove before or after insertion, thereby joining the main plate, side plate, and blade into one piece. Fiber-reinforced plastic impeller.