JPH0472132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method of manufacturing a body frame of a ventilation fan that is embedded in a ceiling or the like.

BACKGROUND TECHNOLOGY As shown in FIGS. 5 to 7, the conventional main body frame of this type of ventilation fan includes a pair of side plates 22 spot-welded to the side edges of a frame body 26 formed of a band-shaped plate.
It was manufactured in the shape of a casing in which a motor 23 with a fan 27 fixedly attached was installed. Then, an exhaust hole 21 is formed in one of the pair of side plates 22, and the top plate 25 of the frame body 26 is
A mounting hole 24 for the electric motor 23 was formed at the portion where the motor 23 was mounted. Note that a suction grill 28 was provided on the suction side of the lower opening of the main body frame.

Problems to be Solved by the Invention However, in such a manufacturing method, spot welding cannot be performed unless a metal plate with good conductivity is used as the material constituting the main body frame. Therefore, after assembling the main body frame, it is necessary to apply the coating using electrodeposition coating, etc., which requires large-scale painting equipment, and each component is joined in spots, so there is no space between each component. This caused problems such as air leakage.

The present invention solves the above-mentioned problems, and eliminates the need for large-scale painting equipment by making it possible to use processed steel plates coated with coatings, etc., for the members constituting the main body frame, and also eliminates the need for large-scale painting equipment. To provide a method for manufacturing a main body frame that is good and eliminates air leakage.

Means for Solving the Problems In order to achieve the above object, the present invention forms a strip of processed steel plate with a coating film etc. into a frame shape having openings at both upper and lower ends, A frame is formed by providing an exhaust hole that communicates with the discharge port of a centrifugal fan provided inside, and a top plate is provided with a squeeze portion around the entire periphery so as to close the upper opening of the frame. The exhaust hole side corner portion of at least one side of the frame portion is formed at a substantially right angle with a notch provided in the upper end portion, and the closing plate is connected to the upper end portion of the frame portion by winding and tightening. The body frame of the ventilation fan is manufactured by bringing it into contact with the side corner of the exhaust hole to close the notch.

Effects The present invention uses the above-described manufacturing method to join the frame part and the top plate that constitute the main body frame by rolling and tightening processing, which is a mechanical process, so the processed steel plate is coated with a coating film or the like on the material of the frame part and the top plate. This eliminates the need for anti-rust coating after the main body frame is assembled. Furthermore, since the frame and the top plate are not connected in spots but in their entirety, there are no gaps and no air leakage occurs.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in the figure, the frame 1 is made by making notches at predetermined intervals on the lower side edge of a strip-shaped processed steel plate coated with a coating film, etc., and bending the notches outward approximately 90 degrees. A mounting piece 2 is formed, a squeeze piece 3 is provided on the upper side edge of the processed steel plate, and both longitudinal ends of the strip are tied together and caulked to form a frame shape. An exhaust hole 4 is provided at one end of one side of the frame 1, and a corner 15 on the side of the exhaust hole 4 is formed at a substantially right angle.
Further, the upper end of this corner 15 is provided with a notch 5 for release of a roll of a seaming machine, which will be described later.

The upper opening of the frame 1 has a top plate 6 having a mounting hole 8 for the electric motor 7 in the center and a squeeze part 9 around the entire circumference. 3 and wrap the squeezed part 9 with a tightening machine as shown in FIG.
It is closed by joining and fixing it to the frame part 1. After this closure, the hole formed by the notch 5 is closed by a closing plate 14 bent at 90 degrees, with one piece of the closing plate 14 abutting against the frame 1 and the other piece against the top plate 6.

By the way, the vicinity of the hole formed in the notch 5 is
As shown in FIG. 4, the width between the closing plate 14 and the exhaust hole 4 is small, and it protrudes outward from the squeeze part 9 of the top plate 6, weakening its strength.
This prevents damage during transportation or installation work.

The main body frame manufactured as described above has a duct connection port 10 in the exhaust hole 4, a centrifugal fan 11 fixed to the electric motor 7 inside, an orifice 12 on the suction side of the fan 11, and an orifice 12 on the lower side. A suction grill 13 is provided at each opening.

Next, the operation of this embodiment will be explained.

When the fan 11 is driven by the electric motor 7, the air taken into the main body frame from the intake grille 13 is exhausted from the exhaust hole 4 and ventilation is performed. Since the frame part 1 and the top plate 6 are formed by winding and tightening, there is no leakage from the joint between the frame part 1 and the top plate 6. Further, the hole formed by the notch 5 at the upper end of the corner portion 15 is closed by the closing plate 14, and air leakage therefrom is also eliminated.

By the way, since the body frame is installed embedded in the ceiling etc., its size is limited, and in order to use the limited space inside the body frame 1 widely and effectively, it is necessary to install the fan 1.
When 1 is a centrifugal type, it is important to locate the outlet as close as possible to the inner wall surface of the frame 1 and to provide the air chamber of the fan 11 to fill this space. The corner 15 of the frame 1 near the exhaust hole 4 needs to be formed at a substantially right angle.

However, since the frame portion 1 and the top plate 6 are joined by winding when constructing the main body frame, the corner portions are formed as circular arcs with a certain degree of curvature.
However, since the notch 5 is provided at the upper end of the corner 15 of the frame 1, there is an escape when the top plate 6 is wrapped around the frame 1, and the corner 15 of the frame 1 is formed at an almost right angle. It is possible to perform winding and tightening processing even if it is left in place.

Furthermore, since the frame part 1 and the top plate 6 are formed from a processed steel plate coated with a coating film, etc., without electrically connecting the frame part 1 and the top plate 6, the frame part 1 and the top plate 6 are not connected electrically. There is no need to apply paint to the body frame formed by the process, and therefore there is no need for large-scale painting equipment for painting a large body frame.

Effects of the Invention As is clear from the above embodiments, according to the present invention, a frame portion formed into a frame shape from a strip of processed steel plate with a coating film etc. and a top plate are joined by a tightening process, and the frame portion Since the main body frame is formed with the exhaust hole side corner on one side at a right angle, there is no need for large-scale painting equipment, reducing costs, and improving the adhesion between the frame and the top plate. This increases efficiency by reducing air leakage, making it possible to use the space within the frame more effectively and improving performance, as well as increasing the rust prevention effect. In addition, the wrapping process between the frame and the top plate over the entire circumference in order to improve adhesion can be easily achieved by providing a notch at the upper end of the corner of the frame. The closing plate that closes the hole created by the notch reinforces the nearby area where the strength has been reduced due to the notch, and improves the strength of the ventilation fan body frame. A manufacturing method can be provided.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an assembled state in a method for manufacturing a main body frame of a ventilation fan according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of a ventilation fan using the same body frame, Figure 3 is a cross-sectional view showing how the frame of the body frame and the top plate are tightened, and Figure 4 is the installation of the closing plate of the body frame. FIG. 5 is a sectional view of a ventilation fan using a conventional main body frame, FIG. 6 is a perspective view after assembling the main body frame, and FIG. 7 is a perspective view before assembling the main body frame. . 1... Frame, 4... Exhaust hole, 5... Notch, 6
...Top plate, 9...Squeezing part, 11...Fan, 1
4... Closing plate, 15... Corner.

Claims (1)

[Claims] 1 A strip of processed steel plate with a coating, etc. applied is shaped into a frame with openings at both the top and bottom ends, and an exhaust hole is provided at one end of one side of the frame to communicate with the discharge port of a centrifugal fan provided inside. is provided to form a frame portion, and a top plate is wound and joined to the upper end portion of the frame portion through a squeeze portion provided around the entire periphery of the top plate so as to close the upper opening of the frame portion, and The exhaust hole side corner of at least one side of the ventilation fan is formed at a substantially right angle with a notch provided at the upper end, and a closing plate is brought into contact with the exhaust hole side corner to close the notch. Method of manufacturing the main body frame.