JPH0587294U - Cylindrical impeller - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cylindrical impeller 3 such as a cross-flow fan that can smooth the flow of air during use and does not deform with high productivity. [Structure] A cylindrical impeller 3 in which a disc-shaped or annular support member 1 and a large number of blades 2a, 2b whose outer ends are located on the outer peripheral surface of the support member 1 are integrally formed by injection molding of synthetic resin. Is. Blades 2a, 2b formed in a cross-sectional airfoil
The blades 2a and 2b are made equal to each other in the inner and outer directions by alternately arranging the blades in opposite directions. [Function] Since the intervals 6 are equalized during rotation, the flow of wind becomes smooth. During the cooling step during manufacturing, the difference in cooling rate between the inner and outer peripheral portions of the mold is reduced, so that distortion is unlikely to occur in the molded product and the molding cycle can be shortened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cylindrical impeller such as a cross flow fan.

[0002]

[Prior Art]

 As a cross-flow fan, conventionally, as shown in FIG. 5, a large number of blades 2 whose outer ends are in contact with the outer peripheral surface of the support member 1 are integrally formed on the support member 1 in the shape of a disk or along the circumferential direction. In some cases, the arranged cylindrical impellers 3 are arranged in a casing 4, and the cylindrical impellers 3 are rotated to blow air in the direction of arrow 5 across the impellers 3.

Then, as shown in FIG. 3, as a cylindrical impeller 3 used for a cross-flow fan, a blade 2 was produced by press-molding a metal flat plate of iron, aluminum or the like and then caulking and welding. The blade 2 has a one-dimensional R-shape in cross section, and it is almost impossible to make the shape into a quadratic R-shape. Therefore, if the blade 2 is formed by injection molding of synthetic resin, the cross-sectional shape of the blade 2 can be made into a free curved surface such as a two-dimensional R shape, as shown in FIG. A cylindrical impeller 3 is also proposed in which a large number of blades 2 are formed integrally with the supporting member 1 by injection molding of synthetic resin, and the blade 2 has a two-dimensional R-shaped blade.

The blade 2 of the cylindrical impeller 3 shown in FIG. 4 has better static pressure and noise during use than the blade shown in FIG.

[0005]

[Problems to be solved by the device]

 However, in the cylindrical impeller 3 shown in FIG. 4, since the thick-walled portion 7 of the blade 2 is located on the inner peripheral side portion, the interval 6 between the adjacent blades 2 is set on the outer peripheral side portion A. On the other hand, there was a problem that the inner peripheral portion B became smaller and the flow of wind was obstructed when the impeller 3 was rotated.

Further, when the cylindrical impeller 3 shown in FIG. 4 is manufactured, the cooling step is performed after the injection step of the synthetic resin. However, due to the cooling structure of the molding die, the cooling rate of the inner peripheral portion is higher than that of the outer peripheral portion. An imbalance occurs in which the cooling rate slows down. This imbalance causes distortion in the molded product, resulting in a deformed product.If the cooling time is adjusted to the cooling rate of the inner peripheral part to prevent the deformation, the molding cycle becomes longer and the production efficiency decreases. there were.

This invention solves the above-mentioned problems and equalizes the intervals between adjacent blades along the inner and outer directions to smooth the flow of wind when the impeller rotates, and to cool the injection molding process. The object is to provide a cylindrical impeller with good productivity and no deformation by averaging the cooling time of the outer and inner circumferences in the process.

[0008]

[Means for Solving the Problems]

 According to the invention, a disk-shaped or annular supporting member and a large number of blades whose outer ends are located near the outer peripheral surface or the outer peripheral surface of the supporting member and arranged along the circumferential direction are made of synthetic resin. A cylindrical impeller integrally formed by injection molding, wherein the cross section of the blade is formed into a two-dimensional R-shaped airfoil, and the blades are alternately arranged in opposite radial directions, and The intervals are equalized inward and outward.

[0009]

[Action]

 In the cylindrical impeller of this invention, a large number of blades formed in a two-dimensional R-shaped airfoil are alternately arranged in the radial direction, so that the thicker portions of the blades alternate with the inner peripheral portion. Since it is located on the outer peripheral part and the outer peripheral part, it is used for a cross flow fan or a sirocco fan by equalizing the intervals between adjacent blades in the inward and outward directions. It is smooth without being hindered by the inner circumference.

Further, during the manufacturing of the cylindrical impeller, the cooling process is performed after the synthetic resin injection process. At this time, the thick-walled portions of the blade are alternately located at the inner peripheral side portion and the outer peripheral side portion. However, since the interval between adjacent blades is equalized in each part in the inward and outward directions, the difference between the cooling rate of the outer periphery of the molding die and the cooling rate of the inner periphery is reduced, and distortion occurs in the molded product. In addition, the cooling time of the circumferential portion can be shortened, and therefore the molding cycle can be shortened and the production efficiency can be improved.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, 1 is a disk-shaped or annular support member, 2a and 2b are many blades, and the support member 1 and the blades 2a and 2b are integrally formed by injection molding of synthetic resin.

The blades 2a and 2b are formed in the same cross-sectional shape as the conventional one shown in FIG. 4, but the thick-walled portions 7a and 7b are alternately arranged on the outer peripheral side and the inner peripheral side, and adjacent to each other. The blades 2a and 2b are made to be opposite to each other in the radial direction, and the distance 6 between the blades 2a and 2b is set so that the outer peripheral side portion A and the inner peripheral side portion B are substantially equal. The structure of this embodiment other than that described above is the same as the conventional structure shown in FIG.

Further, according to the present invention, as shown in FIG. 2, the outer ends of the blades 2a and 2b are integrally formed with the outer peripheral support ring 8, or the support member 1 is provided with a metal member such as a boss or a mounting shaft. Inserting (not shown) may be performed during injection molding. Then, in the injection molding process of the synthetic resin for manufacturing the cylindrical impeller 3 shown in FIGS. 1 and 2, in the injection molding process, the synthetic resin is injected into the closed molding die to support the support member 1 And a large number of blades 2 are integrally molded. After the injection molding process, a cooling process is performed, and in the cooling process, the molded product is cooled while being kept in the mold. At this time, the thick-walled portions 7a, 7b of the blades 2a, 2b are alternately located on the inner peripheral side portion and the outer peripheral side portion, and the intervals 6 between the blades 2a, 2b are equalized in each portion in the inner and outer directions. Therefore, the mold is cooled and hardened in a state where there is little difference in the cooling rate between the mold and the outer peripheral portion. The cooling step is finished at an appropriate time, the mold is opened, the molded product is taken out, and the next step is performed to obtain the cylindrical impeller 3 shown in FIGS. 1 and 2. This impeller 3 is used for a cross-flow fan as shown in FIG.

[0014]

[Effect of the device]

 As described above, the present invention comprises a disc-shaped or annular support member and a plurality of blades whose outer ends are located at or near the outer peripheral surface of the support member and are arranged along the circumferential direction. Is a cylindrical impeller integrally formed by injection molding of synthetic resin, wherein the cross section of the blade is formed into a two-dimensional R-shaped airfoil, and the blades are alternately arranged in opposite radial directions, The following effects can be obtained by equalizing the distance between the adjacent blades in the inward and outward directions.

In the cylindrical impeller of the present invention, a large number of blades formed in the shape of a two-dimensional R-shaped blade are alternately arranged in the radial direction. Since it is located on the side part and the outer peripheral part, it is used for a cross flow fan or a sirocco fan by equalizing the intervals of the adjacent blades in the inward and outward directions. It becomes smooth without being obstructed by the inner peripheral part between the blades.

Further, during the manufacturing process of the cylindrical impeller, the cooling process is performed after the synthetic resin injection process. At this time, the thick wall portions of the blades are alternately located at the inner peripheral side portion and the outer peripheral side portion. However, since the intervals between the adjacent blades are equalized in each part in the inward and outward directions, the difference between the cooling rate of the outer periphery of the molding die and the cooling rate of the inner periphery is reduced, and distortion occurs in the molded product. In addition, the cooling time of the circumferential portion can be shortened, and therefore the molding cycle can be shortened and the production efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a cylindrical impeller according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a cross-sectional view showing an example of a conventional cylindrical impeller.

FIG. 4 is a schematic cross-sectional view showing another example of a conventional cylindrical impeller.

FIG. 5 is a schematic cross-sectional view of a cross-flow fan using a cylindrical impeller.

[Explanation of symbols]

 1 Support Member 2, 2a, 2b Blades 3 Cylindrical Impeller 6 Intervals 7, 7a, 7b Parts where the thickness of the blades is thick

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin injection molding method comprising: a disc-shaped or annular support member; and a large number of blades whose outer ends are located at or near the outer peripheral surface of the support member and are arranged in the circumferential direction. A cylindrical impeller integrally formed by molding,
A cylindrical shape characterized in that the cross section of the blade is formed into a two-dimensional R-shaped airfoil, the blades are alternately arranged in opposite radial directions, and the intervals between adjacent blades are equalized in the inner and outer directions. Impeller.