JPS6245115Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a cross-flow fan that can be easily molded.

(Prior Art) In general, as shown in FIG. 1, a cross-flow fan has a large number of long fan blades 2 each having an arc-shaped cross section at the peripheral edge 1a of the end plate 1, between opposing disc-shaped end plates 1, 1. It is constructed in a cylindrical shape by spanning the blade at appropriate intervals along the blade, and blade supporting members 3 for reinforcement are provided at appropriate intervals between the end plates 1, 1 at both ends. A cross-flow fan configured in this way differs from a normal fan in that it sucks in and blows out air at the outer periphery, and because it exhibits a uniform air blowing function along the axial direction, it has a wide and narrow flow path. It is suitable for installation in air conditioners and is often used as a blower for air conditioners.

By the way, in order to form and assemble a cross-flow fan, as shown in Fig. 2, the fan blades 2 formed separately are inserted one by one through the end plates 1, 1 and the blade support member 3, and then assembled. As shown in Fig. 3, a large number of fan blade component pieces 4 are integrally formed along the peripheral edge 1a of one end plate 1 (or blade support member 3) so that the die cutting direction is in the axial direction. A frame connecting method is adopted in which a plurality of frames 5 are molded as an integrally molded product, and a plurality of frames 5 are arranged in the axial direction and connected to each other for assembly. In particular, this method of joining the pieces employs molding, making it easy to manufacture and assemble, but there is a problem in that the strength is weak because the pieces 5 are connected in the axial direction.

In order to solve this problem, at least the end plate 1 and the fan blade 2 should be integrally molded in an assembled state. However, in this case, since the fan blades 2 must be arranged in an annular shape, This is impossible because the die cutting direction cannot be determined.

Therefore, a group of fan blades is integrally molded between the end plates only within the center angle of 90°, and the fan body is molded with the radial direction of the end plates as the die-cutting direction.
A cross-flow fan has been proposed that can be assembled by connecting divided blade components to the remaining peripheral edge of the fan body.

(Problem to be solved by the invention) By the way, if a small-diameter cross-flow fan is required due to the installation space, the relative blade length (width of fan blades/radius of arrangement of fan blades) should be determined from the relationship of the number of Ray nozzles. You need to take it big. Therefore, when such a small-diameter cross-flow fan is manufactured by molding with the vertical direction, which is the radial direction of the end plate, as the die-cutting direction, as described above, the inner arcuate surface of the fan blade is aligned with the vertical direction. If the radially outer end of a fan blade intersects with the radially inner end of its adjacent fan blade on the same vertical line, a portion that cannot be cut out may occur. This problem occurs. Therefore, the reality is that a cross-flow fan that can be easily manufactured by molding has not yet been proposed.

The present invention was devised in order to focus on the above-mentioned circumstances and solve the problems all at once. An object of the present invention is to provide a cross-flow fan that can be easily molded, has strong strength, and is easy to manufacture.

(Means for Solving the Problems) The present invention includes supporting plates that are appropriately divided along the periphery of opposing disc-shaped end plates to surround them, and integral parts between these opposing supporting plates. In a cross-flow fan, the fan blades are formed in an arc shape with a cross section facing in one direction at appropriate intervals along the circumferential direction of the support plate, with respect to the divided support plate. The inner arcuate surface of the fan blade on one side is formed thickly so that it follows the vertical line in the radial direction of the end plate, and the radially inner end of the fan blade on the other end is formed into a thick wall so that the inner arcuate surface of the fan blade on one side is aligned with the vertical line in the radial direction of the end plate. The support plate is cut out to be located circumferentially outside of the support plate with respect to the vertical line from the radially outer end of the support plate.

(Function) The shape of some of the multiple fan blades that are integrally molded on the divided support plate is thickened and has an irregular blade shape with notches compared to the normal fan blade, so that the vertical direction is the die cutting direction. It can be easily molded using only two molds, one for upper and lower or one for male and female. In addition, since the number of irregularly shaped fan blades is small, there is almost no deterioration in the performance of the crossflow fan.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 4, reference numeral 10 denotes a disc-shaped end plate, and a support plate part 11 is formed extending in an arc shape on the peripheral edge of the end plate 10 within a range of approximately 90 degrees at the center angle. Support plate mounting grooves 12 having center angles of approximately 90° are formed in the peripheral portion. These support plate mounting grooves 1
A partition protrusion 13 is formed between the two. The two end plates 10, 10 configured in this manner are opposed to each other with an appropriate distance apart, and a blade support member 23 having the same configuration is positioned in the center between them, and the respective support plate portions 11, 11 , 11, a plurality of fan blades 14 are arranged at appropriate intervals along the circumferential direction and have arcuate cross sections facing in one direction.
...is integrally extended.

The fan main body 15 is constructed as described above, and the fan main body 15 is integrally molded. A rotary shaft 16 for rotatably supporting the fan body 15 is protruded from the center of one end plate 10 of the fan body 15, and a rubber fitting for fitting a motor shaft is provided at the center of the other end plate 10. Boss part 1
7 is provided.

On the other hand, a blade constituent piece 19 consisting of a support plate 18 and a plurality of fan blades 14 is attached to each support plate mounting groove 12 connected in the axial direction of the fan body 15 by bonding the support plate 18 thereto. It is attached by welding or welding. This blade component piece 19 has three parts in order to correspond to the support plate mounting groove 12 which is continuous in the axial direction of the fan main body 15.
It has two support plates 18 in parallel, and these support plates 1
It is constructed by integrally extending a plurality of fan blades 14, which are formed in an arc shape with a cross section facing in one direction, in the same way as described above, at appropriate intervals between the fan blades 8, 18, and 18 along the circumferential direction. There is. That is, the support plate 18 is appropriately divided along the periphery of the end plate 10 to surround it, and also includes the support plate portion 11 in this embodiment. In the above mounting configuration, the blade component piece 19 is also mounted in the circumferential direction of the fan main body 15 by being positioned in the support plate mounting groove 12 in the same manner as described above.

The fan blades 1 are arranged such that the central angle θ between the fan main body 15 and the blade component piece 19 is set to 90°, and the fan blades 1 are arranged at a predetermined pitch P within this range.
4 (see FIG. 5), the fan blade 14 on one side (third from the left in FIG. 5) of the divided support plate 18 (or support plate portion 11)
The inner arcuate surface 14a of _{No. 4} is formed thicker than the normal or normal inner arcuate surface 14a' indicated by the number of points so as to be along the vertical line V, and the fan on the other side (the rightmost side in FIG. 5) The radially inner end 14x of the blade ₁₄₁ is connected to the fan blade 14 adjacent thereto.
The notch is formed so as to be positioned to the right of the vertical line V from the radially outer end 14y of ₂ . Therefore, if the fan main body 15 and the blade component piece 19 are cut out in the direction A, A' in which they are divided into upper and lower parts in the direction of the vertical line V, which is a part of the radial direction, the die cutting direction shown by the dotted line in FIG. Since there are no portions m and n that cannot be formed, it is possible to integrally form them by molding. In this case, the mold 20 is the sixth
As shown in the figure, it can be constructed from a pair of male and female mold components, an upper mold 20a and a lower mold 20b. That is,
In the mold chamber 21 of the mold 20, the inner wall surface 21a of the mold chamber ₂₁₄ , whose arcuate convex inner wall surface 21a is located in a portion along the vertical line V, is formed into a flat surface along the vertical line V. , and the radially inner end 21x of the mold chamber 211 located at the part where the radially inner end 21x intersects under the vertical line V from the radially outer end _21y is connected to the adjacent mold chamber. ₂₁₂ is formed so as to be spaced apart in the circumferential direction from the vertical line V from the radially outer end 21y of 212. In particular, the mold 20 has a joint part c between the upper mold 20a and the lower mold 20b.
is located at the end 21x or 21y of the mold chamber 21 or on the arcuate concave inner wall surface 21b. As a result, the parding 22, which is a divided protrusion formed on the fan blade 14 by casting, is formed on the outer arcuate surface 14b or on the end portions 14x and 14y, as shown in FIG. Therefore, as is clear from the graph of FIG. 8 showing the relationship between the parting formation position and performance, there is no cause for performance deterioration and the air blowing performance can be improved.

Furthermore, since the shape of the fan blade 14 becomes irregular due to the above-mentioned thickening and notch, the performance of the crossflow fan after assembly becomes a problem, but the irregular blade shape is limited to 1 to 2 of each type. Experiments have shown that there is almost no performance deterioration if this is done. Further, since the irregular blade shape of the fan blades 14 disturbs the periodicity of sounds generated between adjacent fan blades 14, it is extremely advantageous in terms of improving noise such as blade pitch noise.

(Effects of the invention) As is clear from the above explanation, the invention provides the following effects.

(1) When molding fan blades arranged in an arc shape from the radially inner and outer vertical directions, there is no part that cannot be cut out, so the support plate can be used even for small-diameter cross-flow fans. It is possible to easily perform molding in which the fan blade and the fan blade are integrally molded.

(2) Therefore, it is easy to manufacture and can be provided at low cost.

(3) Furthermore, since the fan blade is integrally molded with the support plate as described above and is integrated in the axial direction, it is strong in strength.

(4) Furthermore, some of the fan blades have a modified blade shape due to thickening and notches, which can reduce noise such as blade pitch noise.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a crossflow fan, Figs. 2 and 3 are side views and partially enlarged perspective views showing different conventional crossflow fan assembly structures, and Fig. 4 is an embodiment of the present invention. FIG. 5 is an enlarged sectional view taken along the line V-V in FIG. The figure is a graph showing the relationship between the parting formation position and performance. In the figure, 10 is an end plate, 14 is a fan blade, 1
4 ₄ is a fan blade on one side of the support plate;
14 ₁ is a fan blade on the other side, 14 is an inner arcuate surface, 14 x and 14 y are radially inner and outer ends of the fan blade, 18 is a support plate, and V is a vertical line.

Claims (1)

[Scope of utility model registration request] Support plates that are appropriately divided along the periphery of opposing disc-shaped end plates to surround them, and a support plate that is integrally spanned between these opposing support plates and that extend along the circumferential direction of the support plates. In a cross-flow fan equipped with arc-shaped fan blades whose cross sections face in one direction at appropriate intervals, the inner arcuate surface of the fan blade on one side of the fan blade is placed at the end with respect to the divided support plate. The plate is formed thickly so as to fit along the vertical line in the radial direction, and the radially inner end of the fan blade on the other side is aligned with the vertical line from the radially outer end of the adjacent fan blade. A cross-flow fan characterized in that the support plate is notched so as to be positioned on the outside in the circumferential direction of the support plate.