JP2749291B2 - Ventilation impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller for air blowing and discharging, which is formed by punching sheet metal.

[0002]

2. Description of the Related Art As shown in FIGS. 1A and 1B, a conventional impeller of this kind of punched sheet metal processing structure is formed by punching a large number of blades 2 at equal pitches on a strip made of a metal plate. A pair of rims 3 for connecting the bases of the blades 2 are integrally formed on both sides of the blades 2 (both ears of the band plate) by cutting and raising inwardly in an arc shape. The punched plate 1 is circular and the ends are butted.

As shown in FIGS. 2 and 3, a side plate 4 is integrally fitted into the left and right openings of the impeller, that is, the rim portion 3, and a suction port 5 provided at the center of one of the side plates 4 is provided. More air is collected, and the air is blown outward by the blades 2.

[0004]

In the impeller of this type of punched sheet metal processing, the number and effective length of the impeller are limited due to the restriction of the diameter of the impeller. The length is shortened, and conversely, if the effective length of the blades is increased, the number of blades decreases.Therefore, there is a contradictory problem.For this reason, the number of blades is increased, or the effective length is increased to increase the blowing efficiency. It was difficult to meet the demand for higher performance, and the solution was the biggest challenge.

[0005]

SUMMARY OF THE INVENTION The present invention provides an impeller effectively solving the above-mentioned problems, and includes a pair of right and left rims for connecting bases of circumferentially arranged impellers. In addition, a large number of bent portions for reducing the diameter of the rim portion are formed at intervals in the circumferential direction to reduce the pitch of the blade plates to form an impeller having a required diameter. Further, the present invention raises an intermittent flange from the outer peripheral edge of the rim portion, reduces the interval between the projecting pieces forming the intermittent flange by forming the bent portion, and forms the outer peripheral edge of the side plate internally fitted in the rim portion. In this configuration, the intermittent flange was rolled up and swaged.

In this impeller structure, the number and pitch of the impellers are set on the basis of a large impeller having no bent portion.

[0007] In other words, when the impeller is deployed, the pre-processed punched plate is a strip longer than the circumference of the impeller having a target diameter. The number and pitch are determined and punching is performed.

That is, an impeller having a target diameter is obtained by using a pre-processed punched plate longer than the circumference of the impeller having a target diameter, and the number and effective length of the impellers can be increased.

That is, the bent portion for reducing the diameter of the rim portion provides an impeller having a target diameter, and the target impeller includes a blade plate having both the number and the effective length not limited to the diameter. I do.

Therefore, it is possible to appropriately respond to requests for increasing the number of blades of an impeller having a specific diameter and increasing the effective length. The intermittent flange can be formed into a flange shape in which the interval between the projecting pieces of the intermittent flange is reduced by the reduced diameter while the diameter of the rim portion is reduced without any trouble by the intermittent structure, and this flange is wound around the outer edge of the side plate. By caulking, the side plate can be firmly attached and the overall strength of the impeller can be improved.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the structure of an air impeller according to the present invention.

As shown in FIGS. 4A and 4B, a large number of blades 2 are punched out of a metal plate at equal pitches, and the blades 2 are formed on both sides (both ears of the band). A pair of rim portions 3 that connect the base portions at both ends of the blade plate 2 are integrally formed by punching to form a pre-processed punched plate W1.

As shown in FIGS. 4A and 4B, the pre-processed punched plate W1 is punched so that the blade plate 2 and the rim 3 become flat plates without performing the arc-shaped bending process on the blade plate 2. 4C
As shown in (1), the blade 2 is subjected to an arc-shaped bending process. Alternatively, the arc-shaped bending of the blade 2 is performed simultaneously with the punching.

As the punching process, a shear cut for performing a shearing process without forming an interval between the rim portion 3 and the blade plate 2 or a blank for removing unnecessary portions so as to leave an interval between the rim portion 3 and the blade plate 2. By punching.

Next, as shown in FIGS. 5A and 5B, a plurality of bent portions 6 for reducing the diameter of the rim portion 3 are formed at intervals in the circumferential direction on the rim portion 3 of the pre-cut stamping plate W1 to form a blade plate. A pre-processed punched bent plate W2 having a reduced pitch is formed.

The bent portions 6 are formed for each of the blades 2. The wing plate 2 has a trapezoidal shape, is punched out so that its short side a is a free end and both ends of its long side b are connected to the rim portion 3, and a rim portion adjacent to the connecting portion 7 of the rim portion 3 to the wing plate 2. The bent portion 6 is formed in the region s. The rim bending region s can be set in a region t adjacent to the punching side c of the slat 2, in other words, in a region t between the connecting portions 7 of the slat 2.

That is, the above-mentioned U-shaped bent portion 6 can be formed in a region t of the blade plate 2 from the short side (top side) a to the long side (base side) b. This reduces the pitch of the slats,
The deployment length of the impeller W3 having the target diameter is set.

The number of the blades 2 can be set to an effective length l (the length from the blade side long side a to the base side) and the number of blades not restricted by the diameter of the impeller. For example, it is possible to increase the number of sheets by increasing the effective length of the blades compared with the conventional one, to increase the number of sheets to make the effective length the same as that of the conventional one, or to increase both the number of sheets and the effective length.

As an example of a bent portion for reducing the diameter of the rim portion 3, the rim portion 3 is bent in a U-shape in the circumferential direction. The U
The bent portion 6 projects outward or inward as shown by the solid line or the imaginary line in FIG. 9A. Preferably the U
As shown in FIG. 9B, the bent portion 6 has a structure that is folded over the peripheral surface of the rim portion 3.

As a further suitable example, the above-mentioned U-shaped bent portion 6 is shown in FIG.
And fold it down on the peripheral surface of the rim 3 in the direction opposite to the rotation direction of the drum indicated by the arrow.

Next, as shown in FIG. 6, the preformed punched bent plate W2 is formed in a circular shape and both ends are butt-butted or butt-welded to form an impeller W3 having a target diameter.

The bent portion 6 can be formed after forming the pre-processed punched plate W1 into a circular shape and forming an impeller with both ends welded. That is, as shown in FIGS. 7A and 7B, the preformed punched plate W1 shown in FIG. 4 is made circular and both ends are butt-welded to form a drum-shaped preformed impeller W2 '.
This impeller W2 'is larger in diameter than the impeller W3 of the target diameter. On the rim portion 3 of the pre-processed impeller W2 ', a number of bent portions 6 for reducing the diameter of the rim portion 3 are formed at intervals in the circumferential direction to reduce the pitch of the blades, and the target diameter shown in FIG. Is formed.

As shown in FIG. 8, an intermittent flange 8 is stamped and formed on the outer peripheral edge of the rim 3. That is, the protruding pieces 8a corresponding to the intermittent flanges 8 are punched out at intervals in the pre-processed punched plate W1 and bent up at the same time as the punching or post-bending to form the intermittent flanges 8. I do.

The intermittent flange 8 reinforces the rim portion 3,
Reinforce the entire impeller. The bending margin (rim portion bending area s) of the U-shaped bending portion 6 is set between the projecting pieces 8a. The rim bending region s (the region between the protruding pieces 8a) corresponds to a region adjacent to the connecting portion of the impeller. Therefore, by forming the U-shaped bent portion 6, the protruding pieces a are adjacent to each other without any gap as shown in FIG. 8B, or are adjacent to each other with a greatly reduced interval.

As shown in FIG. 8C, the side plate 4 is fitted into the left and right openings of the impeller W3 thus formed. In other words, the side plate 4 is fitted inside the inner surfaces of the left and right rim portions 3 and, as shown in FIG.
And crimp it.

A suction port 5 is formed at the center of the one side plate 4, and the air sucked from the suction port 5 is blown to the outside of the impeller diameter by the impeller 2.

[0027]

According to the present invention, the effective length of the blades and the number of blades can be set on the basis of the design of an impeller having a diameter larger than that of the target diameter. By using the impeller, it is possible to provide an impeller having an effective length and the number of blades that are not restricted by the diameter of the impeller.

Therefore, the contradictory problem of increasing the number of blades in the conventional example, that is, shortening the effective length and increasing the effective length, decreasing the number of blades can be effectively solved.

Also, the intermittent flange can be formed into a flange shape in which the interval between the projecting pieces of the intermittent flange is reduced by the reduced diameter while the diameter of the rim portion is reduced without difficulty by the intermittent structure. The side plate is firmly attached by being swaged and crimped around the periphery, so that the overall strength of the impeller can be improved.

[Brief description of the drawings]

FIG. 1A is a plan view of a preprocessed punched plate showing a conventional example, and FIG.
Is the same side view.

FIG. 2 is a perspective view of an impeller formed from the punched plate.

FIG. 3 is a sectional view of the impeller.

FIG. 4A is a plan view of a pre-processed punched plate showing an embodiment of the present invention, B is a cross-sectional view taken along the line AA, and C is an arc-shaped bending process performed on a blade plate of the pre-processed punched plate. Side view.

FIG. 5A is a plan view of a preformed punched bent plate in which a rim portion of the preprocessed punched plate is provided with a bent portion for reducing the diameter, and FIG. 5B is a side view of the same.

FIG. 6 is a side sectional view of an impeller in which the preformed punched bending plate is formed in a circular shape.

FIG. 7A is a plan view of the preprocessed punched plate shown in FIG. 4A, and FIG.
Fig. 4 is a side view of a pre-processed impeller which is formed in a circular shape without a bent portion for reducing the diameter of a rim portion.

8A is a plan view of a preformed punched plate obtained by integrally punching a protruding piece for an intermittent flange, FIG. 8B is a side view of a circular impeller having a bent portion formed thereon, and FIG. Sectional view in which a side plate was fitted inside.

9A is a side view showing an example of a bent portion, and FIG. 9B is a side view showing another example.

[Explanation of symbols]

 2 blade plate 3 rim portion 4 side plate 5 suction port 6 bent portion 7 connecting portion 8 intermittent flange W1 pre-processed punched plate W2 pre-processed punched bent plate W2 'pre-processed impeller W3 impeller a short side b long side c side Side s rim bending area l effective length

Claims (1)

(57) [Claims] A plurality of blades arranged in a circumferential direction, and a pair of rims arranged on both sides of the blades and connected to both end bases of the blades. In a blower / discharge impeller having an integrated structure by punching sheet metal processing, a large number of bent portions for reducing the diameter of the rim portion are formed in the rim portion at intervals in the circumferential direction to reduce the blade plate pitch, Further, the intermittent flange is raised from the outer peripheral edge of the rim, the interval between the projecting pieces forming the intermittent flange is reduced by the formation of the bent portion, and the outer peripheral edge of the side plate internally fitted to the rim is used. An impeller for air blowing and discharging, wherein an intermittent flange is rolled up and swaged.