JP2004218622A - Casing for sirocco fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casing for a sirocco fan structured to be manufacturable at a low cost with the improvement of machining workability by reducing an equipment cost required for manufacture regarding the casing for the sirocco fan with a spirally curved peripheral plate 15 held and jointed by the outer peripheral edges of two opposed side plates 10a, 10b formed in plane spiral shape. <P>SOLUTION: Collars 15a bent outward are formed along both side edges of the peripheral plate 15, and a plurality of dowels 12 projected inward are formed at suitable spaces at the side plates 10a, 10b along the outer peripheral edges. The collars 15a are allowed to abut on the dowels 12, and the outer peripheral edges of the side plates 10a, 10b are seam-folded inward to hold the collars 15a, thus jointing the peripheral plate 15 to the side plates 10a, 10b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a casing of a centrifugal multi-blade fan such as a turbo fan and a sirocco fan.
[0002]
[Prior art]
A multi-blade fan incorporated as a blower into various devices is configured by housing an impeller having a large number of blades arranged in a ring in a spiral casing, and the casing of the multi-blade fan has a planar spiral shape. It is manufactured by sandwiching a spirally curved peripheral plate at the outer peripheral edges of the formed two opposing side plates. Conventionally, as a method of joining the side plate and the peripheral plate without welding, there is a method shown in FIGS.
[0003]
The casing shown in the figure is formed in a planar spiral shape, and a peripheral plate 15 is sandwiched between one side plate 10a having an air suction port 11 opened substantially in the center and the other side plate 10b opposed to the side plate 10a. An air discharge port 16 is opened. The outer edges of the side plates 10a and 10b are sandwiched by bending both side edges of the peripheral plate 15 (see FIG. 9), and the peripheral plate 15 is firmly and airtightly joined to the side plates 10a and 10b.
[0004]
[Problems to be solved by the invention]
In the manufacture of the casing by such joining means, a special roll caulking machine is required to caulk the side edge of the peripheral plate 15 along the outer peripheral edge of the side plates 10a and 10b, and it is necessary to use a general-purpose press machine. The facility cost was expensive because it was not possible. An object of the present invention is to solve such a problem, and to achieve a large reduction in equipment costs required for manufacturing by enabling joining by a general-purpose press machine or the like, and a structure that can be manufactured at low cost by improving workability. It is an object of the present invention to provide a multi-blade fan casing.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the casing of the multi-blade fan according to claim 1 has a peripheral plate 15 curved in a spiral shape at the outer peripheral edges of two opposed side plates 10a and 10b formed in a planar spiral shape. In the casing of the multi-blade fan which is sandwiched and joined, a flange 15a which is bent outward along both side edges of the plate 15 is formed, and a dowel 12 projecting inward is formed on the side plates 10a and 10b along the outer peripheral edge. To form a plurality at appropriate intervals. Then, the flange 15a is brought into contact with the dowel 12, the outer peripheral edges of the side plates 10a, 10b are bent inward, the flange 15a is sandwiched, and the peripheral plate 15 is joined to the side plates 10a, 10b.
[0006]
Further, in the casing of the multi-blade fan according to the second aspect, the outer peripheral edge of the two opposing side plates 10a and 10b formed in a flat spiral shape is sandwiched and joined by a spirally curved peripheral plate 15. In the casing of the multi-blade fan, a flange 15a is formed by bending outward along both side edges of the peripheral plate 15, and a step 13 bulging outward along the outer peripheral edges of the side plates 10a, 10b. Then, the collar 15a is brought into contact with the step 13, the outer peripheral edges of the side plates 10a, 10b are bent inward, and the collar 15a is sandwiched, and the peripheral plate 15 is joined to the side plates 10a, 10b.
Hereinafter, embodiments of the present invention will be specifically described based on examples in the drawings.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 4 show an embodiment of the casing according to claim 1, in which the outer peripheral edge of two opposed side plates 10a and 10b also formed in a flat spiral shape sandwich a spirally curved peripheral plate 15. The air outlet 16 is opened on the side surface. The peripheral plate 15 is formed by curling a strip-shaped thin plate in a spiral shape, and has a brim 15a bent outward on both side edges. On the other hand, on the side plates 10a and 10b, a plurality of dowels (small protrusions) 12 projecting inward at a predetermined distance from the outer peripheral edge are formed at appropriate intervals along the outer peripheral edge.
[0008]
Using the side plates 10a, 10b and the peripheral plate 15 formed in this way, the collar 15a is brought into contact with the dowel 12, and the outer peripheral edges of the side plates 10a, 10b are folded inward to sandwich the collar 15a. Are firmly and airtightly joined to the side plates 10a and 10b (see FIGS. 2 and 3).
[0009]
This joining step is shown in FIG. First, the collar 15a is brought into contact with the dowel 12 for positioning, and the outer peripheral edge of the side plate 10a is bent inward (step a). Here, the peripheral plate 15 is supported by being in contact with the dowel 12 and does not escape, and the outer peripheral edge of the side plate 10a is bent 90 degrees along the upper end of the flange 15a. Next, the bent outer peripheral edge is further bent by 90 degrees so as to sandwich the brim 15a (step b). In this manner, the outer peripheral edges of the side plates 10a and 10b are folded inward in a two-punch process using a general-purpose press, and the peripheral plate 15 is joined to the side plates 10a and 10b.
[0010]
5 and 6 show an embodiment of the casing according to the second aspect, in which the outer peripheral edge of two opposed side plates 10a and 10b also formed in a flat spiral shape sandwiches a peripheral plate 15 curved in a spiral shape. The air outlet 16 is opened on the side surface. As in the previous example, the peripheral plate 15 is formed by spirally bending a strip-shaped thin plate, and has a brim 15a that is bent outward at both side edges. On the other hand, the side plates 10a and 10b have a step 13 bulging outward along the outer peripheral edge.
[0011]
Using the side plates 10a, 10b and the peripheral plate 15 formed in this way, the collar 15a is brought into contact with the step 13, the outer peripheral edges of the side plates 10a, 10b are folded inward, and the collar 15a is sandwiched. Are firmly and airtightly joined to the side plates 10a and 10b (see FIG. 6). In this joining step, as in the previous example, the flange 15a is brought into contact with the step 13 to bend the outer peripheral edge of the side plate 10a inward, and then the bent outer peripheral edge is further bent by 90 degrees, using a general-purpose press machine. This is performed in a punching process, and the outer peripheral edges of the side plates 10a and 10b are folded inward, and the peripheral plate 15 is joined to the side plates 10a and 10b.
[0012]
【The invention's effect】
As described above, the casing of the multi-blade fan according to the present invention described in claim 1 or 2 can join the side plates 10a and 10b and the peripheral plate 15 by bending using a general-purpose press. In addition, equipment costs can be significantly reduced by eliminating the need for dedicated machines. Further, the peripheral plate 15 is supported in contact with the dowel 12 or the step 13 so as not to escape, and the outer peripheral edges of the side plates 10a and 10b are bent in a two-punch process so that the peripheral plate 15 is bent. The present invention provides a multi-blade fan casing that can be firmly and air-tightly joined to a multi-blade fan and has excellent workability and can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment of a casing according to claim 1.
FIG. 2 is an enlarged cross-sectional end view taken along line AA in FIG.
FIG. 3 is an enlarged sectional end view taken along line BB in FIG. 1;
FIG. 4 is an enlarged sectional view of a main part showing a joining step.
FIG. 5 is a plan view of an embodiment of the casing according to claim 2;
6 is an enlarged cross-sectional end view taken along line CC in FIG. 5;
FIG. 7 is a plan view of a conventional casing.
FIG. 8 is a front view of the same.
9 is an enlarged cross-sectional end view taken along line DD in FIG. 7;
[Explanation of symbols]
10a, 10b Side plate 12 Dowel 13 Step 15 Peripheral plate 15a Collar

Claims (2)

In the casing of the multi-blade fan, the outer peripheral edges of the two opposing side plates 10a and 10b formed in a plane spiral shape sandwich and join the spirally curved peripheral plate 15;
Forming a brim 15a bent outward along both side edges of the peripheral plate 15,
A plurality of dowels 12 projecting inward are formed on the side plates 10a and 10b at appropriate intervals along the outer peripheral edge,
A casing of a multi-blade fan in which the flange 15a is brought into contact with the dowel 12, the outer peripheral edges of the side plates 10a and 10b are bent inward, the flange 15a is sandwiched, and the peripheral plate 15 is joined to the side plates 10a and 10b. In the casing of the multi-blade fan, the outer peripheral edges of the two opposing side plates 10a and 10b formed in a plane spiral shape sandwich and join the spirally curved peripheral plate 15;
Forming a brim 15a bent outward along both side edges of the peripheral plate 15,
Forming a step 13 bulging outward along the outer peripheral edge of the side plates 10a, 10b;
A casing of a multi-blade fan in which the flange 15a is brought into contact with the step 13, the outer peripheral edges of the side plates 10a, 10b are folded inward, the flange 15a is sandwiched, and the peripheral plate 15 is joined to the side plates 10a, 10b.

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