JP3497735B2 - Duct ventilation fan - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a ventilation fan for a duct, which includes an intermediate mounting type, for connecting to a duct mounted on a ceiling surface or communicating with the duct both indoors and outdoors to exchange air.

[0002]

2. Description of the Related Art Conventionally, a duct joint and a joint base are fixed together by means such as welding or caulking, except for those integrally molded of synthetic resin and those made of metal and integrally formed with the duct joint and joint base. It was done by.

However, as shown in FIG. 5, the duct joint 1
2 is difficult to flatten the flange portion due to wrinkles at the time of drawing, and distortion 17 is caused by means such as welding or caulking when fixing the duct joint 12 and the joint base 9, and the duct joint 12 and the joint There is a problem that a gap a is likely to be generated between the bases 9 and the amount of air leaked from the gap a causes a decrease in air volume and pressure, an increase in operating noise, and an occurrence of abnormal noise.

In FIG. 5, reference numeral 1 is a makeup grille, 2 is a spring, 3 is a bell mouth, 4 is a ceiling surface, 5 is a blower body,
6 is a sirocco fan, 7 is an electric motor, 8 is a side hole, 10 is an airtight packing, 11 is a duct, 13 is a caulked part, and 14 is a flange part. Since these are common to the present invention, the details are the present invention. Will be described in detail in the section of Examples.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to minimize the gap between the duct joint and the joint base, suppress air leakage from the gap, not reduce the air volume, and reduce noise.
It is to provide a duct ventilation fan with high performance and high reliability in which abnormal noise is rarely generated.

[0006]

The first object of the present invention is to provide an annular bent portion on the outer circumference of a flange portion of a duct joint , and
This can be achieved by fixing the joint to the joint base .

[0007]

[0008]

[0009] The above object, the second, we established an annular bent portion on the outer periphery of the flange portion of the duct joint, so that along the outside diameter of the annular bent portion, can be achieved by providing an annular recess in the joint base.

By providing an annular bent portion on the outer circumference of the flange portion of the duct joint and fixing the duct joint to the joint base , the flange portion can be made flat during molding of the duct joint and the flange portion The strength is improved, and there is no distortion even by means such as welding or caulking when fixing the duct joint and the joint base, and the gap between the duct joint and the joint base can be made minute.

[0011]

[0012]

Furthermore, outside the flange portion of the duct joint.
Along with installing an annular bent portion around the circumference , along the outer diameter of the annular bent portion, by providing an annular recess in the joint base, the flange portion can be made flat when molding the duct joint,
Further, the strength of the flange portion is improved, it is not distorted by means such as welding or caulking when fixing the duct joint and the joint base, and the labyrinth effect makes it possible to make the gap between the duct joint and the joint base minute.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

Reference numeral 1 is a decorative grill, to which a spring 2 is attached, and by inserting the spring 2 into a groove (not shown) provided in the bell mouth 3, the ceiling surface 4 can be freely moved up and down by the thickness of the ceiling material. Can be installed.

A blower body 5 includes a sirocco fan 6 for sending out air, an electric motor 7 for transmitting a rotational force to the sirocco fan 6, and the like.

Reference numeral 12 is a metal duct joint, the flange portion 14 of which is joined to the metal joint base 9 at a plurality of welding portions 13. An airtight packing 10 is installed on the metal joint base 9 so as to prevent leakage of air when connecting to the side hole 8 of the blower body 5, and the metal duct joint 12
Is a diameter dimension that can be connected to the duct 11 communicating with the outdoors.

The ventilation fan for the present duct is mainly composed of three sub-assemblies, that is, the above-mentioned makeup grill 1 sub-assembly, the blower main body 5 and the duct joint 12 sub-assembly. The duct 11 communicating with the outdoors is installed in advance, the duct joint 12 is connected to the duct 11, and then the side hole 8 of the blower main body 5 is aligned with the joint base 9 side.
Slide upwards and attach it to the ceiling surface 4 by means of screws or the like.
The installation is completed by attaching the makeup grill 1 and finally.

The dirty air in the room or bathroom is sucked from the makeup grill 1 when the sirocco fan 6 is rotated by the electric motor 7, and efficiently collected by the blower body 5 by the bell mouth 3, and the duct joint 12 from the side hole 8. , Is discharged to the outside through the duct 11.

(Embodiment 1) An annular bent portion (A) is provided on the outer circumference of the flange portion 14 of the metal duct joint 12 shown in FIG.
15 is provided to increase the strength against bending and twisting of the flange portion 14 and to form the flatness with high accuracy. Further, the welded portion 13 at the time of fixing the duct joint 12 and the joint base 9 does not distort and eliminates the gap between the duct joint 12 and the joint base 9.

(Embodiment 2) In the metal joint base 9 shown in FIG. 2, an annular bent portion (B) 16 is formed along the inner diameter of the duct joint 12, and the duct joint 12 and the joint base 9 are fixed. The distortion caused by the welding portion 13 at that time does not affect the air leakage, and the gap between the duct joint 12 and the joint base 9 is eliminated by the effect of the labyrinth.

(Embodiment 3) In the metal joint base 9 shown in FIG. 3, an annular bent portion (B) 16 is formed along the outer diameter of the duct joint 12, and the duct joint 12 and the joint base 9 are formed. The distortion due to the welded portion 13 at the time of fixing does not affect the air leakage, and the effect of the labyrinth eliminates the gap between the duct joint 12 and the joint base 9.

(Embodiment 4) An annular bent portion (A) is provided on the outer periphery of the flange portion 14 of the metal duct joint 12 shown in FIG.
15 is provided to increase the strength against bending and twisting of the flange portion 14 and to form the flatness with high accuracy. Further, the welded portion 13 at the time of fixing the duct joint 12 and the joint base 9 also forms without distortion. Further, an annular recess 18 is provided in the joint base 9 so as to follow the outer diameter of the annular bent portion (A) 15, and the gap between the duct joint 12 and the joint base 9 is eliminated by the effect of the labyrinth.

With the above construction, the joint base 9 and the duct joint 12 both have improved joint strength and adhesion strength, and the gaps in the overlapping portions are almost eliminated to prevent air leakage. Further, there is no need to paint or caulk the duct joint 12 and the joint base 9 after fixing to prevent wind leakage, and to prevent leakage packing from being sandwiched between the duct joint 12 and the joint base 9, thereby reducing the manufacturing cost. Therefore, the duct ventilation fan with high reliability regarding wind leakage can be supplied to the market relatively inexpensively.

[0025]

Since the present invention is configured as described above, it has the following effects.

By providing an annular bent portion on the outer periphery of the flange portion of the duct joint and fixing the duct joint to the joint base , the flange portion can be made flat during molding of the duct joint, and the strength of the flange portion can be improved, so that the duct joint It does not distort even by means such as welding or caulking when fixing the joint and the joint base, the gap between the duct joint and the joint base can be made very small, air leakage from the gap is suppressed, and the air volume does not decrease,
It is possible to provide a duct ventilation fan that has low noise, a low frequency of abnormal noise, high performance, and high reliability.

[0027]

[0028]

An annular bent portion is provided on the outer circumference of the flange portion of the duct joint, and an annular recess is provided in the joint base so as to follow the outer diameter of the annular bent portion, so that the flange portion is flattened during molding of the duct joint. In addition, the strength of the flange is improved, and it is not distorted by means such as welding or caulking when fixing the duct joint and joint base.The labyrinth effect makes it possible to minimize the gap between the duct joint and joint base. It is possible to provide a duct ventilation fan that suppresses wind leakage from the inside, does not reduce the air volume, has low noise, has a low frequency of generating abnormal noise, has high performance, and has high reliability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a duct ventilation fan installation state showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a duct ventilation fan installation state showing Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view of a duct ventilation fan installation state showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a duct ventilation fan installation state showing a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional duct ventilation fan installation state.

[Explanation of symbols]

1 ... Makeup grille, 2 ... Spring, 3 ... Bell mouth, 4 ... Ceiling surface, 5 ... Blower body, 6 ... Sirocco fan, 7 ... Electric motor, 8 ... Side hole, 9 ... Joint base, 10 ... Airtight packing, 11 … Duct, 12… Duct joint, 13… Welded part,
14 ... Flange part, 15 ... Annular bending part (A), 16 ... Annular bending part (B), 18 ... Annular recessed part.

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Claims (2)

(57) [Claims] 1. A duct having a duct base which is connected to a duct that communicates indoors and outdoors or only outdoors and has a joint base for connecting the duct joint and the blower main body . in ventilation fan, an annular bent portion provided on the outer periphery of the flange portion of the duct joint, the da
A ventilation fan for a duct, characterized in that a joint joint is fixed to the joint base . 2. The duct ventilation fan according to claim 1 , wherein the joint base is provided with an annular recess along the outer diameter of the annular bent portion.