JPH07317699A - Casting for cylindrical multi-blade fan - Google Patents

Abstract

PURPOSE:To provide a casing for a cylindrical multi-blade fan easy to assemble. CONSTITUTION:Two housings 1, 2 are formed by the press working of a metal plate, and a positioning projection 5a or a positioning hole 5b is provided on part of the discharge port section of one of the housings 1, 2 to fix a flange 3. Outer periphery sections of both housings 1, 2 are folded at a right angle, coupling holes 6a are provided, and a casing for a cylindrical multi-blade fan can be obtained when the coupling holes 6a are fixed with rivets or screws 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical multi-blade fan casing which is easy to assemble.

[0002]

2. Description of the Related Art A conventional casing of a cylindrical multi-blade fan has two side plates 20 formed in a required shape as shown in FIG.
A peripheral plate 21 curved in a circular shape is arranged between the both side plates,
In addition, after inserting the engaging pieces projecting on both side edges of the periphery into the engaging holes formed in the side plate, they are bent and integrated, or the insertion holes formed in the two side plates shown in FIG. After inserting the protruding part formed at the end, bend it at a right angle and spot weld the protruding part, or expand and deform the concave part to fix the protruding part without bending at a right angle as shown in FIG. It is configured to do.

[0003]

However, in the casing having the structure shown in FIG. 4, since the engaging piece of the peripheral plate is inserted into the engaging hole of the side plate and bent to assemble, the burrs and the engaging parts generated during punching of the side plate. One-sided protrusion is dangerous. Further, there is a problem that the bending work of the engaging piece requires man-hours.

Further, the casing shown in FIG. 5 also requires a bending step, and since the side plate and the projecting portion are spot-welded and fixed for many months, there are problems similar to those in the processing step and the configuration of FIG. Also in the casing, there are problems such as defective formation of recesses.

Further, in the casing having the structure shown in FIGS. 4 to 6, it is difficult to insert the protrusion into the insertion hole.
Further, when the fan diameter is larger than the motor diameter when assembling the casing of the motor and the fan, a casing mounting plate is required, which causes an increase in the number of assembling steps and cost.

The present invention solves such a problem. The number of assembling steps and the price are improved by forming the housing structure of the side plate and the peripheral plate into a bracket structure in which the housing integrally formed by metal plate press working and the other housing are combined. It is an object of the present invention to propose a casing capable of reducing

[0007]

In order to achieve the above object, the casing of the present invention is a casing of a cylindrical multi-blade fan which is constructed by assembling a housing formed by metal plate press working, and has an optional outer peripheral portion. The housing has a proper number of engaging holes and is installed along the positioning protrusions or positioning holes provided at the discharge port position, and the housing is fixed with a flange by rivets or spot welding, and the outer peripheral edge is bent at a right angle. A casing for a cylindrical multi-blade fan, characterized in that a housing 2 having a counter hole corresponding to the bent housing is fixed by rivets or screws, which is a means for solving the problems. is there.

[0008]

According to the above construction, since the housing to which the flange is fixed is attached and fixed to the housing, the number of assembling steps including the motor can be reduced.

Also, by bending the outer peripheral edge of the housing at a right angle, the strength of the flat surface after processing can be improved, and it is possible to use a thin metal plate, and at the same time, the burr generated during pressing is inside. It is possible to secure work safety.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cylindrical multiblade fan casing of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a casing assembly of a motor and a fan according to an embodiment of the present invention, FIG. 2 is a partial perspective view of a housing 1 with a flange 3 attached, and FIG. It is a side view of the state bent.

In FIG. 2, a positioning projection 5a or a positioning hole 5b is formed at an arbitrary position of the discharge port of the housing 1 formed by pressing a metal plate. The flange 3 is attached along the protrusion 5a or the positioning hole 5b from the discharge port direction of the housing 1, and is fixed by spot welding or rivet caulking.

Further, engaging holes 6a are formed on the outer peripheral portion of the housing 1 at arbitrary and appropriate positions.

On the other hand, a counter hole 6b corresponding to the engaging hole 6a on the outer peripheral portion of the housing 1 is also formed on the housing 2.

The outer peripheral edge of the housing 2 is bent at an angle close to a right angle which does not cause a problem when combined with the housing 1 so as to improve the strength of the flat surface portion.

In the motor assembly method as shown in FIG. 1, the housing 1 and the housing 2 configured as described above are mounted in a sequentially stacked manner and formed on the outer peripheral portions of the housing 1 and the housing 2. Aperture 6
The casing of a cylindrical multi-blade fan is constructed by combining a and the counter hole 6b, and assembling and fixing them with rivets, screws and the like.

[0017]

As is apparent from the above embodiments, according to the casing of the cylindrical multi-blade fan of the present invention, the housing 1 and the housing 2 having the bracket structure are formed by press working, and the housing 1 is pre-assembled. Since the flange is attached to the casing, the work for assembling the casing of the motor and the fan is facilitated, and the outer peripheral portion of the housing 2 is bent at a right angle to reduce the thickness of the metal plate. Since the direction is inward, safety is also improved, and even if the fan diameter is larger than the motor diameter, the mounting plate is not required, so excellent effects can be achieved in terms of processing, cost, and work. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a casing of a motor and a fan according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a housing 1.

FIG. 3 is a side view showing a state where the outer peripheral edge of the housing 2 is bent at a right angle.

FIG. 4A is a perspective view of a casing of a conventional cylindrical multi-blade fan. FIG. 4B is a diagram showing how the side plate and the peripheral plate are fixed in the casing.

FIG. 5A is a perspective view of a casing of a conventional cylindrical multiblade fan. FIG. 5B is a view showing how the side plate and the peripheral plate are fixed in the casing.

FIG. 6A is a perspective view of a casing of a conventional cylindrical multi-blade fan. FIG. 6B is a diagram showing how side plates and peripheral plates are fixed in the casing.

[Explanation of symbols]

 1 Housing 1 2 Housing 2 3 Flange 5a Projection 5b Positioning hole 6a Engagement hole 6b Counter hole 10 Motor 11 Fan 12 Plate 13 Fixing nut 14 Rivet or screw 20 Side plate 21 Peripheral plate

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[Procedure amendment]

[Submission date] March 2, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (1)

[Claims] 1. A casing of a cylindrical multi-blade fan, which is constructed by assembling a first housing and a second housing formed by pressing a metal plate, and has a plurality of engaging holes in an outer peripheral portion, Corresponds to the first housing in which a flange is attached along the protrusion or the positioning hole provided at the insertion position of the outlet and the flange is fixed by rivets or spot welding, and the housing in which the outer peripheral edge is bent at a right angle. A casing of a cylindrical multi-blade fan, characterized in that a second housing having a hole to be fixed is riveted or screwed.