JPH11125445A - Ventilation fan - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To ensure the clearance between the outer surface of the casing and the inner surface of the main body frame without being damaged by the folding of the installation work, the effect of preventing dew condensation on the inner surface of the main body frame, and noise. So that the effect of preventing the occurrence of blemishes can be reliably obtained. SOLUTION: A convex portion 27 is provided on the outer surface of a casing 23 made of foamed plastic which is housed in a main body frame 11 and surrounds the blower blades 21, and the convex portion 27 is provided on the inner surface 1 of the main body frame 11.
1a, the gap 30 is secured between the outer surface 23b of the casing 23 other than the convex portion 27 and the inner surface 11a of the main body frame 11.
By providing 7 so as to be located inward of the main body frame 11 from the flange portion 16 of the main body frame 11, the convex portion 27 is located at a place where the cutter does not reach or hardly reaches at the time of mounting work, The projection 27 was not cut by the cutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan in which a casing surrounding a blowing blade is formed of foamed plastic.

[0002]

2. Description of the Related Art Conventionally, in this type of ventilation fan,
A blower is provided in the main body frame, and the air in the room facing the main body frame is discharged outside through the main body frame by the blower. In such a ventilation fan, when the room facing the above-mentioned main body frame is a room such as a bathroom that generates high-temperature and high-humidity air, when the high-temperature and high-humidity air passes through the inside of the main body frame, it is cooled by the main body frame. As a result, dew condensation occurs on the inner surface of the main body frame, and the dew may flow down from the inside of the main body frame to the outside of the main body frame or drop.

Therefore, a countermeasure is provided as disclosed in Japanese Utility Model Publication No. 5-31469. As shown in FIG. 8, a motor 2 is mounted on a main body frame 1, a blower blade 3 is mounted on the motor 2, and a casing 4 surrounding the blower blade 3 is housed in the main body frame 1. In this structure, the casing 4 is formed of foamed plastic, and the lower end edge of the casing 4 is provided with the convex portion 5, and the convex portion 5 comes into contact with the inner surface of the main body frame 1. As a result, the casing 4 other than the protrusion 5
A gap 6 is provided between the outer surface and the inner surface of the main body frame 1.

In this apparatus, when air blown in by the blower blades 3 passes through the inside of the main body frame 1, a space between the main body frame 1 and the casing 4 made of foamed plastic which is a heat insulating material, a heat insulating air layer, And the cooling by the body frame 1 is eliminated, so that the above-described problems of dew condensation, the flow of the dew, and dripping do not occur.

[0005]

In the case described above, the projection 5 of the casing 4 is provided at the lower edge of the casing 4 and is formed at the peripheral edge of the opening on the lower surface of the main body frame 1. It is located almost flush with the flange 7 as an attachment portion. On the other hand, as shown in FIG.
Then, the ceiling 8 is cut with a cutter 9 in accordance with the inner surface of the main body frame 1 so that the air vent 1
It may be performed by a method of forming 0.

In this case, the ceiling 8 is made of a material that can be cut by the cutter 9 such as a gypsum board. When the ceiling 8 is cut as described above, the cutting edge of the cutter 9 is positioned below the ceiling 8. While being invisible to the worker who works, it cuts into the convex portion 5 of the casing 4 and
May be cut. Moreover, in this case, since the cutter 9 is advanced along the inner surface of the main body frame 1, the projection 5 may be cut in a long range accordingly.

In this case, it is uncertain that the clearance 6 between the outer surface of the casing 4 and the inner surface of the main body frame 1 by the convex portion 5 is uncertain. Problem may occur. In addition, the protrusions 5 cause the casing 4 to be stretched in the main body frame 11, thereby generating noise such as chattering sound (sound produced when the casing 4 repeatedly contacts and separates from the main body frame 1). It also works effectively to prevent However,
When the projections 5 are cut as described above, the casing 4 loses its support in the main body frame 1 and moves freely, thereby generating noise such as the above-mentioned chattering noise.

The present invention has been made in view of the above-mentioned circumstances, and accordingly, it is an object of the present invention to ensure the clearance between the outer surface of the casing and the inner surface of the main body frame without being damaged by the folding of the mounting work. It is an object of the present invention to provide a ventilation fan that can reliably obtain the effect of preventing dew condensation on the inner surface of the main body frame and also can reliably obtain the effect of preventing noise.

[0009]

In order to achieve the above object, a ventilating fan according to the present invention has an opening on one side, a main body frame having a flange portion at an edge thereof, and a main body frame housed in the main body frame and having a motor. A blower blade that is driven to rotate, and a casing that is housed in the main body frame and surrounds the blower blade. The casing is formed of foamed plastic, and a convex portion is provided on an outer surface of the casing. A part is brought into contact with the inner surface of the body frame to secure a gap between the outer surface of the casing other than the protrusion and the inner surface of the body frame. It is characterized by being provided so as to be located inside the frame.

According to this, the convex portion of the casing is
The cutter is located at a position where the cutter does not reach or is difficult to reach at the time of the installation work, so that the projection is prevented from being cut by the cutter. In this case, the convex portion replaces the outer surface of the casing,
It may be provided on the inner surface of the main body frame at a portion located inside the main body frame from the flange portion of the main body frame.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 1 shows the entirety of the duct ventilation fan in an attached state. The main body frame 11 is located on the back side (upper side) of the ceiling 13 which is a ventilation fan attachment member of the room 12 and attached to the ceiling 13. I have. In addition, a vent 13 is formed in the ceiling 13.

On the other hand, the main body frame 11 is formed in a substantially rectangular parallelepiped box shape from a metal plate or plastic, and has an opening at the lower surface which is one surface.
In particular, the flange portion 16 is formed so as to protrude outward on the entire peripheral portion. An exhaust port 17 is formed in the upper part of the side wall part of the main body frame 11, especially the right side wall part in the drawing, and a wind pressure release type shutter 18 is provided on the outer part of the main body frame 11 of the exhaust port 17. A duct connection tube 19 is attached. The main frame 11 is provided with a motor 2 at almost the center of the upper wall.
0 is mounted in a vertically penetrated state (inside and outside), the blower blades 21 are accommodated in the main body frame 11, and the blower blades 21 are attached to the motor 2.
0 is attached to the lower end of the rotating shaft 22.

Further, a casing 23 is provided in the main body frame 11.
Is housed. The casing 23 is formed of a foamed plastic as a heat insulating material, for example, styrofoam.
4, and a suction port 25 is formed substantially at the center of the partition part 24. An inner surface 23 a of the casing 23 above the partitioning portion 24 is formed in a wall shape of a substantially lower half portion of a vortex chamber surrounding the blowing blade 21, and is connected to the exhaust port 17.

In accordance with the shape of the inner surface 23a of the casing 23, the upper wall of the main body frame 11 is formed with a wall shape 26 substantially at the upper half of the vortex chamber. Like the inner surface 23a of the nozzle 23, it is connected to the exhaust port 17. Also, as is clear from these, the exhaust port 17
Is formed in a portion of the main body frame 11 where the casing 23 is located.

On the other hand, the outer surface 23b of the casing 23 has a shape along the inner surface 11a of the main body frame 11, in this case, a rectangular parallelepiped as shown in FIG.
A protrusion 27 is formed on the lower edge of 3b. Here, FIG. 3 shows a dimensional relationship between the casing 23 and the main body frame 11, and a transfer dimension B of the outer surface of the convex portion 27 of the casing 23 with respect to a transfer dimension A of the inner surface 11 a of the main body frame 11. It is set equal to or slightly larger than that (A ≦ B), and the crossover dimension C of the outer surface 23b other than the convex portion 27 of the casing 23 is set smaller (A> C).

The height D from the upper surface to the lower surface, which is the dimension in the insertion direction of the casing 23, with respect to the depth dimension D from the opening 15 of the main body frame 11 to the portion 28 where the casing 23 abuts on the back. E is set smaller (D> E). Further, as is apparent from FIG. 3, the convex portion 27 is not provided on the right side surface of the casing 23 in the drawing, that is, the surface on the exhaust port 17 side of the main body frame 11. It is provided except for the side surface. In addition, convex part 2
7 is provided on the upper portion on the tip side of the casing 23, as shown in FIG.
As shown in detail in FIG. 1, an inclined surface 29 having an upwardly tapering shape is formed.

With this configuration, the casing 23 is attached to the body frame 1.
1 through the opening 15. At this time, the casing 23 has an upper end portion as a distal end portion and a lower end portion as a proximal end portion. Therefore, the convex portion 27 is located around the proximal end portion of the casing 23. The insertion of the casing 23 is performed until the upper end of the casing 23 is stopped by the stop portion 28. As a result, the casing 23 has the base end (lower end) due to the dimensional relationship of D> E. ) Is located inside the main body frame 11 from the flange portion 16 of the main body frame 11, and the convex portion 27 is also located inside the main body frame 11 from the flange portion 16 of the main body frame 11.

Then, at that position, the convex portion 27 is
A predetermined gap 30 is secured between the outer surface 23 b of the casing 23 other than the convex portion 27 and the inner surface 11 a of the main body frame 11.

On the other hand, FIG. 5 shows an example of mounting a ventilation fan. In this case, the ceiling 13 is made of a material that can be cut by the cutter 31, such as a gypsum board. On the other hand, the ventilation fan has the motor 20 mounted on the main body frame 11, the blower blades 21 mounted on the motor 20, and the casing 23 inserted and housed in the main body frame 11 as described above. Is fixed on the ceiling 13 by the flange portion 16.

Then, the ceiling 13 is cut by the cutter 31 in accordance with the inner surface 11a of the main body frame 11, whereby
The vent 14 is formed. At this time, the casing 23
The protrusion 27 of the main body frame 1 is
1, the cutting edge of the cutter 31 does not reach or hardly reaches the protrusion 27. Thereafter, as shown in FIG. 1, a decorative cover 33 having a ventilation hole 32 is attached to the ceiling 13 to cover the ventilation hole 14 of the ceiling 13. A duct 34 is connected to the duct connection tube 19 of the main body frame 11 in advance.

Next, the operation of the above configuration will be described. With the ventilation fan attached as described above, the motor 20
When the motor is energized, the motor 20 is activated to rotationally drive the blower blades 21, and the driven blower blades 21 move the air in the room 12 from the vent holes 32 of the decorative cover 33 to the vent holes 14 of the ceiling 13 and Through the opening 15 of the body frame 11, the body frame 1
1 and further into the casing 23 through the suction port 25 of the casing 23. Then, the sucked air is advanced along the inner surface 23 a of the casing 23 and the vortex chamber wall shape 26 of the main body frame 11, and is discharged from the exhaust port 17 to the shutter 1.
8 is discharged to the outside through the duct 34 while being opened.

At this time, the sucked air is supplied to the main body frame 11.
And a gap (insulated air layer) 30 between the outer surface 23b of the casing 23 and the inner surface 11a of the main body frame 11 secured by the convex portion 27 of the casing 23. This prevents the inhaled air from being cooled by the main body frame 11, thereby avoiding the problem of dew condensation on the inner surface 11 a of the main body frame 11, the flow of the dew, and the drip. Can be

In the case of this configuration, the projection 27 of the casing 23 in which the above-mentioned gap 30 is secured is the main frame 1.
The first flange portion 16 is located inside the main body frame 11. As a result, as described above, the cutter 31 does not reach the protrusion 27 of the casing 23 or becomes difficult to reach during the folding of the mounting work, and the protrusion 27 is cut by the cutter 31. Disappears.

Thus, the casing 23 by the projection 27
3 between the outer surface 23b of the body and the inner surface 11a of the body frame 11
0 can be reliably secured without impairing the folding of the installation work, and the problem of dew condensation on the inner surface 11a of the main body frame 11, the flow of the dew, and dripping can be more reliably prevented.

Further, the projection 27 is formed by connecting the casing 23 to the main frame 1.
1 so that chattering sound (casing 2
3 is a function of effectively preventing the generation of noise, such as a sound produced by repeatedly repeating contact and separation with respect to the main body frame 11. Since the portion 27 is no longer cut by the cutter 31, the casing 23 does not lose its support in the main body frame 11 and becomes free to move, and the noise such as the above-mentioned chattering sound is more reliably reduced. It can be prevented from occurring.

It should be noted that, in the above configuration, when the transfer dimension B of the outer surface of the convex portion 27 is set to be larger than the transfer size A of the inner surface 11a of the main body frame 11, the convex portion 27 is
1 can be brought into pressure contact with the inner surface 11a to prevent leakage of air from the abutting portion, thereby contributing to an improvement in performance.

In the case of the above structure, the casing 2
Reference numeral 3 designates a base portion (lower end portion) located inside the main body frame 11 from the flange portion 16 of the main body frame 11, and has a convex portion 27 around the base end portion. Thereby, in addition to being able to eliminate the protruding portion 27 being cut by the cutter 31, in addition to folding the casing 23 into the main body frame 11, the contact of the protruding portion 27 with the main body frame 11 is performed at the end of the insertion. You can do it. Therefore, the protrusion 27 can be inserted into the main body frame 11 without abutting so far, and can be inserted without receiving frictional resistance due to the abutment, thereby improving the assemblability.

Further, in the case of the above-described structure, the protrusion 27
Are provided except for the surface of the casing 23 on the exhaust port 17 side of the main body frame 11. As a result, the surface on the exhaust port 17 side of the casing 23 comes into contact with the main body frame 11 on the entire surface, not the convex portion 27, and many surfaces are connected to the main body frame 1
1 can be prevented from leaking air at the exhaust port 17 and contribute to improvement of performance.

In addition, in the case of the above configuration, the protrusion 27
Has an inclined surface 29 on the tip end side (upper portion) of the casing 23. Thereby, the resistance by the convex portion 27 when the casing 23 is inserted into the main body frame 11 can be reduced, the insertion becomes easy, and the assemblability can be further improved. Further, in this case, the protrusion 27 itself can be prevented from being caught, and the protrusion 27 can be prevented from being lost. Thus, the outer surface 23b of the casing 23 and the inner surface 11 of the body frame 11 can be prevented.
a can be more reliably ensured.

6 and 7 show the second and third embodiments of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, respectively, and will be described. Omitted,
Only the differences will be described. [Second Embodiment] In a second embodiment shown in FIG. 6, a casing 41 in place of the above-mentioned casing 23 has a base end (lower end) positioned substantially flush with the flange 16 of the main body frame 11. The main body frame 11 has a convex portion 27 at an inner portion, for example, an intermediate portion.

Also in this case, the convex portion 27 of the casing 41 can be located inward of the main body frame 11 from the flange portion 16 of the main body frame 11, so that the cutter 31 can be folded into the casing 41 at the time of mounting work. Does not reach or hardly reach the convex portion 27 of the projection, and the projection 27 is not cut by the cutter 31. Therefore, the gap 30 between the outer surface 41b of the casing 41 and the inner surface 11a of the main body frame 11 due to the convex portion 27 is formed.
The frame can be secured securely without damaging the folding of the installation work.
The problem of dew condensation on the inner surface 11a, the flow of the dew, and the dropping can be prevented more reliably.

Still, in this case, the casing 4
A gap 1 (insulated air layer) 30 between the outer surface 41b of the casing 41 and the inner surface 11a of the main body frame 11 can extend to a position where the lower end is almost flush with the flange portion 16 of the main body frame 11. Also, since it is possible to secure the position of the lower end, which is almost flush with the flange portion 16 of the main body frame 11, the effect of thermally insulating the air sucked into the main body frame 11 from the main body frame 11 is further improved. In addition, the dew condensation on the inner surface 11a of the main body frame 11, the flow of the dew, and the problem of dripping can be prevented more reliably from occurring.

[Third Embodiment] In a third embodiment shown in FIG. 7, a portion of the side wall adjacent to the stop portion 28, which is located inside the main body frame 11 from the flange portion 16 of the main body frame 11, is formed. A convex portion 51 is formed on the inner surface, and the outer surface 23 b of the casing 23 is brought into contact with the convex portion 51, whereby a gap is formed between the inner surface 11 a of the main body frame 11 other than the convex portion 41 and the outer surface 23 b of the casing 23. 30 is secured.

Even in this case, the cutter 31 does not reach or is difficult to reach the convex portion 51 of the main body frame 11 at the time of mounting work, and the convex portion 51 is not cut by the cutter 31. Therefore, the gap 30 between the outer surface 23b of the casing 23 and the inner surface 11a of the main body frame 11 due to the convex portion 51 can be reliably secured without damaging the folding of the mounting work, and the dew condensation on the inner surface 11a of the main body frame 11 and the The problem of dripping under the flow of dew can be prevented more reliably.

Further, in this case, the above-mentioned projection 5
The inner surface of the side wall portion adjacent to the stop portion 28 of the main body frame 11 forming the portion 1 is a portion corresponding to the front end portion (upper end portion) of the casing 23, that is, the inner surface 11 a of the main body frame 11.
Of the casing 23 corresponds to the tip of the casing 23.
1 are formed. In addition to this, a portion of the outer surface 23b of the casing 23 which is located inward of the main body frame 11 from the flange portion 16 of the main body frame 11, and which is closer to the base end (lower end portion) than the front end of the casing 23. ) Side, in this case, a convex portion 27 is also provided on the base end portion.

Accordingly, in this case, the outer surface 23b of the casing 23 is brought into contact with the convex portion 51 and the convex portion 27 is brought into contact with the inner surface 11a of the main body frame 11, whereby the convex portions 51, 27 Inner surface 1 of body frame 11 other than
A gap 30 is secured between the outer surface 23b of the casing 23 and the protrusions 2a.
In addition to preventing the cutters 7 and 51 from being cut by the cutter 31, the gap 30 between the outer surface 23 b of the casing 23 and the inner surface 11 a of the main body frame 11 is entirely reduced by the convex portions 27 and 51. Evenly secured, body frame 1
The problem of dew condensation on the inner surface 11a, the flow of the dew, and dripping can be prevented more reliably.

Moreover, in this case, the fixing of the casing 23 in the main body frame 11 can be more reliably performed by the convex portions 27 and 51, so that noise such as the above-mentioned chattering noise is not generated more reliably. Can be.

The projections 27 and 51 are provided on the casing 23,
41 may be provided partially or fragmentarily. Further, the whole ventilation fan is not limited to the duct ventilation fan mounted on the ceiling 13 of the room, but can be widely applied to general ventilation fans such as a kitchen ventilation fan mounted on the side wall of the room. In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

[0039]

The present invention is as described above.
The following effects are obtained. According to the ventilation fan of the first aspect, the clearance between the outer surface of the casing and the inner surface of the main body frame can be reliably secured by the convex portion of the casing without being damaged by the folding of the mounting work, and the dew condensation on the inner surface of the main body frame is formed. The effect of prevention can be reliably obtained, and the effect of prevention of noise generation can also be reliably obtained.

According to the ventilation fan of the second aspect, the casing can be folded into the main body frame, and the projection can be brought into contact with the main body frame at the end of the insertion, thereby improving the assemblability. According to the ventilation fan of the third aspect, the effect of thermally insulating the air sucked into the main body frame and the main body frame is further improved, and the dew condensation on the inner surface of the main body frame and the flow of the dew are obtained.
The problem of dripping can be prevented more reliably.

According to the ventilating fan of the fourth aspect, the entire casing can be brought into contact with the main body frame on the surface of the main body frame on the side of the exhaust port, so that air leakage at the exhaust port portion can be more reliably achieved. Can be prevented, and the performance can be improved. According to the ventilation fan of the fifth aspect, the casing can be easily inserted into the main body frame, and the assembling property can be improved.
In addition, it is possible to prevent the protrusion of the insertion fold from being lost, and it is possible to more reliably secure a gap between the outer surface of the casing and the inner surface of the main body frame.

According to the ventilation fan of the sixth aspect, the gap between the outer surface of the casing and the inner surface of the main body frame can be ensured by the convex portion of the main body frame without being damaged by the folding of the mounting work.
The effect of preventing dew condensation on the inner surface of the main body frame is reliably obtained, and the effect of preventing generation of noise can also be reliably obtained.

According to the ventilating fan of the seventh aspect, the gap between the outer surface of the casing and the inner surface of the main body frame can be uniformly secured as a whole, and the problem of dew condensation on the inner surface of the main body frame, the flow of the dew, and dripping can be further reduced. It is possible to reliably prevent the noise from being generated, and at the same time, it is possible to more reliably fix the casing in the main body frame, and it is possible to more reliably prevent noise from being generated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention in a state where a ventilation fan is mounted.

FIG. 2 is an exploded perspective view.

FIG. 3 is an exploded longitudinal sectional view of a main part.

FIG. 4 is an enlarged front view of a convex portion of the casing.

FIG. 5 is a vertical cross-sectional view of the main part during installation work.

FIG. 6 is a view corresponding to FIG. 5, showing a second embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 8 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 9 is a diagram corresponding to FIG. 5;

[Explanation of symbols]

11 is a main body frame, 13 is a ceiling (ventilation fan mounting member), 14 is a vent, 15 is an opening, 16 is a flange, 17 is an exhaust port, 20 is a motor, 21 is a blower blade, 23 is a casing, and 23b is a casing. , 27 is a convex portion, 29 is a slope, 30 is a gap, 31 is a cutter, 41 is a casing,
1b denotes an outer surface of the casing, and 51 denotes a projection.

Claims (7)

[Claims] 1. A main body frame having an opening on one surface and having a flange portion at an edge thereof; a blower blade housed in the main body frame and driven to rotate by a motor; A casing surrounding the blades, and the casing is formed of foamed plastic, and a convex portion is provided on the outer surface of the casing, and the convex portion is brought into contact with the inner surface of the main body frame, so that a portion other than the convex portion is formed. A ventilator in which a gap is secured between an outer surface of a casing and an inner surface of a main body frame, wherein the convex portion is provided so as to be located inside the main body frame from a flange portion of the main body frame. 2. The ventilation fan according to claim 1, wherein the casing has a base end located inside the main body frame from a flange portion of the main body frame, and has a projection around the base end. 3. The ventilation fan according to claim 1, wherein the casing has a base end located substantially flush with the flange portion of the main body frame, and has a convex portion in a portion inward of the main body frame. . 4. The ventilation fan according to claim 1, wherein the main body frame has an exhaust port at a portion where the casing is located, and the casing has a convex portion except for a surface of the main body frame on the exhaust port side. . 5. The ventilation fan according to claim 1, wherein the projection has a slope on the side of the tip of the casing. 6. A main body frame having an opening on one surface and a flange portion at an edge thereof; a blower blade housed in the main body frame and driven to rotate by a motor; A casing surrounding the blades, the casing is formed of foamed plastic, and a convex portion is provided on the inner surface of the main body frame at a portion located inward of the main body frame from the flange portion of the main body frame. A ventilation fan wherein an outer surface is abutted to secure a gap between an inner surface of the main body frame other than the convex portion and an outer surface of the casing. 7. A main body frame having an opening on one surface and a flange at an edge thereof; a blower blade housed in the main body frame and driven to rotate by a motor; A casing surrounding the blades, the casing is formed of foamed plastic, and a projection is provided on a portion of the inner surface of the main body frame corresponding to the tip end of the casing. Are also provided on the portion located on the base end side of the casing from the distal end portion, and these convex portions are brought into contact with the outer surface of the casing and the inner surface of the body frame, respectively. A ventilation fan wherein a gap is secured between the inner surface of the main body frame other than the convex portion and the outer surface of the casing.