JPH0828494A - Multibalde fan - Google Patents

Abstract

PURPOSE:To enable an optimal number of blades bent by the specific curvature to be attached by connecting mutually adjacent upper and lower end plate parts to each other on both ends in the blade width direction of an impeller, so as to be cylindrically laid, and caulking and fitting upper and lower plates on both ends of this cylindrical body. CONSTITUTION:In a multiblade fan A, upper and lower plates 3, 4 are caulked and fixed on both ends of a cylindrical body 2 formed by connecting a required number of impeller constituting plates 1 provided with impellers 11. The cylindrical body 2 is circularly laid by hooking a hooking part 41 on a part to be hooked 51 and bending the hooking part 41, and connecting them into a rectangular shape in a mutual upper end plates and mutual lower end plates 31, 31 of the mutually adjacent impeller constituting plates 11. In the cylindrical body 2, the mutually adjacent impellers can be arranged as close as possible by setting the lengths (1) of the upper and lower end plates including the hooking part 41 and the part to be hooked 51 to the desired value. Thereby, a multiblade fan A provided with the optimal number of blades having the specific curvature can be manufactured without being influenced by the outside dimension of the fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-blade fan, and more particularly to a multi-blade fan in which blades are manufactured one by one and fixed to upper and lower plates.

[0002]

2. Description of the Related Art Conventionally, as a fan used in a blower or the like, a multi-blade fan has been widely used in order to obtain a small size, high pressure, and a large air volume. In a multi-blade fan, a required number of blades are cut and raised from a single plate, the substrate is wound in a ring shape, the upper plate and the lower plate are crimped and fixed, and the flat plate is squeezed into a cylindrical shape. A type that cuts and raises the blades (called the former in the following)
In addition, as shown in FIG. 8, there is a type in which fan blades 100 are manufactured one by one, and both ends of the blades 100 are implanted and fixed in a donut-shaped upper plate 3 and a disk-shaped lower plate 4.

[0003]

The multi-blade fan of the type in which the blades 100 shown in FIG. 8 are manufactured one by one is
Since the number and length of 100 can be freely designed, it is necessary to create a fan whose performance is improved compared to the former, where the length of the board is naturally determined by the outer diameter of the fan and the number of blades is limited by the chord length. Is possible. However, the upper and lower plates 3, 4
When implanting the implant piece 101 protruding from the end of the blade 100 for each of the implant holes 34, 44 that are bored at equal intervals, the closer the interval between the implant holes 34, 44 is, the more caulked after inserting the holes. Implants 101 to be fixed 101 interfere with each other, so it is impossible to prevent the number of blades from being limited, and the number of blades to be implanted is determined by selecting a proper place, and the performance cannot be improved as expected. It was the actual situation. In addition, the implantation work was troublesome and expensive.

The present invention has been made in view of conventional circumstances, and its technical problem is to provide an optimum number of blades that are curved with a predetermined curvature.

[0005]

The technical means taken in order to achieve the above-mentioned technical object is as follows. Claim 1 discloses that upper and lower end plates having desired lengths at both ends in the spanwise direction of a blade curved to a predetermined curvature. Part is provided to form a required number of blade component plates, and upper and lower plate members of adjacent blade component plates are connected to each other to form a cylindrical body, and upper and lower plates are provided at upper and lower ends of the cylindrical member. The gist is that they have been caulked and fixed. According to a second aspect of the present invention, each of the upper and lower end plate portions according to the first aspect has a hook portion at one end in the length direction and a hooked portion at the other end, and the upper end plate portion and the lower end plate portion are the same as each other. The gist is that the above-mentioned cylindrical body is formed by hooking the hooking portion and the hooked portion to each other. Further, a third aspect of the present invention is summarized as the blade according to the first or second aspect, in which the positions of desired portions of the inner and outer side edges or the outer edge are displaced. Further, a fourth aspect of the present invention is that the blade according to the first or second aspect is configured such that the opposite positions on both inner and outer edges are displaced in the same shape so that the chord length is the same over the entire span. And

[0006]

According to the above technical means, there are the following actions. (Claim 1) The upper and lower end plate portions adjacent to each other at both ends of the blade in the spanwise direction are connected to each other and wound in a cylindrical shape, and the upper and lower plates are crimped and fixed to both end portions of the cylindrical body. Therefore, FIG.
As shown in FIG. 3, by arbitrarily selecting the length dimension 1 of the upper and lower end plate portions (the length dimension in the direction perpendicular to the extending direction of the blade wingspan (referred to as W in FIG. 3)) , The number of blades can be freely set regardless of the outer diameter of the fan. (Claim 2) The cylindrical body can be formed only by hooking the hooking portion and the hooked portion to each other. (Claim 3) It is possible to provide a low noise property in which separation of air generated at the outer edge of the blade during rotation is generated with a time lag in the entire length section of the blade. (Claim 4) In addition to claim 3, the chord length L of the blade is made the same over the entire width W of the blade, and uniform work is performed over the entire blade (see FIG. 7).

[0007]

Since the present invention is constructed as described above, it has the following advantages. (Claim 1) By selecting the length dimension of the upper and lower end plate portions (length dimension in a direction perpendicular to the blade width extension direction), a blade having a predetermined fan outer diameter and curved to a predetermined curvature can be obtained. The number of blades can be freely set, and a high-performance multi-blade fan having the desired optimal number of blades can be easily and reliably manufactured. (Claim 2) In addition to claim 1, the work of winding the cylindrical body by connecting the respective blade constituent members to each other can be performed efficiently, and the manufacture of a high-performance multi-blade fan becomes easier. (Claim 3) In addition to claim 1 or 2, it is possible to provide a high-performance multi-blade fan having noise reduction type blades. (Claim 4) In addition to claim 3, it is possible to improve the durability of the blade by performing uniform work over the entire area of the blade.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 4 show a first embodiment of the present invention, and FIG.
6 and 6 respectively show the second embodiment. First, the first embodiment will be described.

The multi-blade fan A has a necessary number of blade constituent plates 1 having blades 11, a cylindrical body 2 formed by connecting adjacent blade constituent plates 1 ... The upper and lower plates 3 and 4 are fastened and fixed.

As shown in FIG. 3, the blade constituting plate 1 has a desired length dimension 1 (with respect to the extending direction of the blade width W of the blade 11) at the upper and lower ends of the blade 11 curved in a predetermined curvature in the blade width direction. Upper and lower end plate portions 21 and 31 are continuously provided, and a hooking portion 41 is provided at one end in the length direction of the upper and lower end plate portions 21 and 31, and a hooked portion 51 is provided at the other end. Each is prepared, and the necessary sheets are prepared.

The hooked portion 51 has a horizontal piece 51a extending one step lower at one end of each of the upper and lower plate portions 21 and 31, as shown in the figure.
The hooking portion 51 is a hooking hole 51b, and the hooking portion 41 is an insertion hooking piece 41a which is bent vertically downward to the other end of each of the upper and lower end plate portions 21 and 31.

As shown in FIG. 4, the blade 11 displaces the desired position of the outer edge. This is to prevent the air separation phenomenon that occurs at the outer edge (outlet side) of the blade during rotation from occurring simultaneously in all sections of the blade so that noise can be reduced. Its shape is a tooth shape as shown. Inclining linearly from one end to the other. It is slanted linearly from the highest point of the central part toward one end and the other end. It is also free to make such shapes. Further, although not shown, the positions of desired portions of the inner edge (inlet side) as well as the outer edge may be displaced. Furthermore, as shown in FIG. 7, the same positions on both the inner and outer edges facing each other may be displaced to the same shape so that the chord length L is made to be the same over the entire width W of the blade. As an example of this, the blade inner and outer edges are inclined in parallel in a zigzag shape as shown in the drawing.

Further, rising pieces 21a, 31a are formed by bending upward on the upper edge of the upper end plate portion 21 and the lower edge of the lower end plate portion 31, respectively.

In the cylindrical body 2, the upper end plate portions 21 and 21 of the adjacent blade forming plate 11 and the lower end plate portions 31 and 31 of the adjacent blade constituting plate 11 are engaged with each other by the hooking portion 41.
Is hooked on the hooked portion 51, and the hooking portion 41 is bent to connect in a rectangular shape and wound in a circular shape (FIG. 1).

This cylindrical body 2 has a length dimension 1 of upper and lower end plate portions 21 and 31 including a hooking portion 41 and a hooked portion 51 (in a direction perpendicular to the extending direction of the blade width W of the blade 11). By setting the length dimension) to a desired value, it becomes possible to arrange the adjacent blades 11 as close to each other as necessary. And this cylindrical body 2
The ring-shaped upper plate 3 is attached to one of the rising pieces 21a of the group, and the lower plate 4 having a boss portion 5 is attached to the other rising piece 31a of the group by caulking and fixing the rotating shaft of the motor. The multi-blade fan A is assembled and formed.

As described above, in the first embodiment, the upper and lower end plate portions 21,
By setting the length dimension 1 of 31 (the length dimension in the direction perpendicular to the extending direction of the blade width W of the blade 11) to a desired curvature without being influenced by the outer diameter dimension of the fan. A high-performance multi-blade fan A having the optimum number of blades 11 can be manufactured.

Next, a second embodiment will be described. This second embodiment shows a modified example of the hooking portion 41 and the hooked portion 51, and the other structure is the same as that of the first embodiment and is the same. The reference numerals are attached and the description is omitted.

The hooked portion 51 is composed of a protruding piece 51c protruding laterally from one end of each of the upper and lower end plate portions 21 and 31 described above, and the hooked portion 41 is the upper and lower end plate. Two pieces of the upper sandwiching piece projecting upward at a distance from the other end of each of the parts 21 and 31.
41b, 41b and a lower clip piece horizontally protruding from the center thereof
41c, and the lateral piece portion 51c ′ of the protruding piece 51c is provided between the adjacent blade constituent plates 11 and the upper sandwiching pieces 41b, 41.
After being inserted between b and the lower clip 41c, the upper clip 41b,
The tip of 41b is bent along the rear end face of the horizontal piece 51c ', and the horizontal piece 51c' is sandwiched by the upper and lower sandwiching pieces 41b, 41b, 41c, and the blade constituent plates 11 adjacent to each other are hooked. Stop.

Also in the second embodiment, the length dimension 1 of the upper and lower end plate portions 21 and 31 including the hooking portion 41 and the hooked portion 51 (direction perpendicular to the extending direction of the wing width W of the blade 11) Length dimension of
By setting as desired, adjacent blades 11 can be arranged as close to each other as necessary.

As described above, according to the present invention, the hooking portion 41 and the hooked portion are
By setting the length dimension 1 (length dimension in the direction perpendicular to the extending direction of the blade width W of the blade 11) of the upper and lower end plate portions 21 and 31 having the left and right 51, the blade 11 curved to a predetermined curvature. It is possible to manufacture a high-performance multi-blade fan A by freely setting the number of sheets without depending on the outer diameter of the fan, and also to reduce noise.

The hooking portion 41 and the hooked portion 51 are not limited to the structures of the first and second embodiments as long as the desired number of blades can be connected. Further, the upper and lower end plate portions 21, 31 are connected to each other by hooking the hooking portion 41 and the hooked portion 51 and bending after hooking, but by performing a known method such as spot welding or bonding. Is also good. In this case, although not shown, the upper and lower end plate portions are connected to each other with a desired curvature by spot welding, bonding, etc. to form a curved substrate, and the fixing by spot welding or bonding is not destroyed on this substrate. A cylindrical body is formed by applying elastic deformation to some extent, and the upper and lower plates are fixed by caulking.

[Brief description of drawings]

FIG. 1 is a side view of a multi-blade fan according to a first embodiment with a part cut away.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is an enlarged perspective view showing an end plate portion of a blade constituent plate which is a main part.

FIG. 4 is an exploded perspective view of a multi-blade fan.

FIG. 5 is an enlarged cross-sectional view of a main part of a multi-blade fan according to a second embodiment.

FIG. 6 is an enlarged perspective view showing an end plate portion of a blade constituent plate which is a main part.

FIG. 7 is a front view showing a modified example of the blade constituent plate.

FIG. 8 is an exploded perspective view of a conventional multi-blade fan.

[Explanation of symbols]

 A: Multi-blade fan 11: Blade component plate 21: Upper end plate portion 31: Lower end plate portion 11: Blade 41: Locking portion 51: Locked portion 3, 4: Upper and lower plates

Claims (4)

[Claims] 1. An upper and lower end plate portion of a desired length is formed by providing upper and lower end plate portions of a desired length at both ends of a blade curved in a predetermined curvature in a spanwise direction, and upper end plate portions of adjacent blade constituent plates are comrades. A multi-blade fan characterized in that lower end plate parts are connected to each other to form a cylindrical body, and upper and lower plates are caulked and fixed to upper and lower end parts of the cylindrical body. 2. The upper and lower end plate portions each have a hooking portion at one end in the length direction and a hooked portion at the other end, and the upper end plate portion and the lower end plate portion are respectively the hooking portions. The multi-blade fan according to claim 1, wherein the hooked portion and the hooked portion are hooked to each other to form the cylindrical body. 3. The multi-blade fan according to claim 1, wherein the blades are ones in which desired positions of inner and outer both side edges or outer edges are displaced. 4. The blade according to claim 1 or 2, wherein the blades have the same chord length over the entire span thereof by displacing the same positions of the inner and outer edges facing each other to the same shape. Multi-wing fan.