JP3256382B2 - Ceiling ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation fan for a ceiling comprising a motor, a fan and a casing for covering the fan in a main body frame.

[0002]

2. Description of the Related Art An example of this type of ceiling ventilation fan is shown in FIGS. In FIG. 9, a motor 2 is disposed in a main body frame 1 of the ceiling ventilation fan at a central portion on an upper surface side thereof, and a fan 4 is attached to a lower end portion of a rotating shaft 3 of the motor 2. Have been. A casing 5 is provided in the main body frame 1 so as to cover the fan 4. An exhaust port 1a is formed in a right side wall portion of the main body frame 1, and an exhaust duct 7 is connected to the exhaust port 1a via an exhaust port body 6.

In addition, a discharge port 5a (FIG. 1) is located on a side wall of the casing 5 at a position corresponding to the exhaust port 1a.
1), and a discharge port 5b is formed at the tip of the discharge port 5a. In this case, as shown in FIG. 11, when the casing 5 is fastened and fixed to the main body frame 1 with screws 8, the discharge port 5a of the casing 5 comes into contact with the opening edge of the exhaust port 1a, and the discharge port 5b and the exhaust port 5b are exhausted. Mouth 1a
Are configured to communicate with each other. Here, as shown in FIG. 10 and FIG.
A U-shaped cushion member 9 is adhered to the opening edge of “a”. When the discharge port 5a of the casing 5 abuts on the cushion member 9, air is prevented from leaking from the abutting portion. That is, the cushion member 9 absorbs product variations in the dimensions of the casing 5 or the main body frame 1. In addition, a suction port 5c as a bell mouth is formed at the center of the lower surface of the casing 5, and the upper surface of the casing 5, which is opposite to the bell mouth, is opened.

[0004]

However, in the above-mentioned conventional structure, when the casing 5 is inserted into the main body frame 1 and assembled, as shown in FIG. Since the cushion member 9 is rubbed against the cushion member 9, the cushion member 9 may be peeled off or damaged, thereby causing a problem that air leakage occurs. In addition, the work of bonding the cushion member 9 to the main body frame 1 was troublesome. Further, the cushion member 9
, The number of parts increases and the manufacturing cost increases.

In addition, in order to prevent the cushion member 9 from peeling off when the casing 5 is assembled to the main body frame 1, as shown in FIG. Is designed to increase the gap d between them to some extent. In the case of this configuration, when assembling the casing 5 into the main body frame 1, the casing 5 is inserted into the main body frame 1 so as to approach the side opposite to the discharge port 5 a (left side in FIG. 1), and then the casing 5 is connected to the discharge port. The casing 5 is moved to the side of the section 5a (to the right in FIG. 1) so that the discharge port 5a of the casing 5 comes into contact with the cushion member 9, and then the casing 5 is screwed to the main body frame 1 with screws 8.
This prevents the corner 5d of the discharge port 5a from hitting or rubbing the cushion member 9 as much as possible. However, in the above configuration, the gap d between the side wall of the casing 5 on the side opposite to the discharge port 5a and the main body frame 1 becomes large, so that the internal volume, that is, the expansion rate of the casing 5 becomes small. There is a disadvantage that the amount of air blow is reduced.

Accordingly, an object of the present invention is to prevent air leakage, to eliminate the need for a cushion member, to reduce the number of parts and manufacturing cost, and to minimize the gap between the casing and the body frame. An object of the present invention is to provide a ceiling fan that can be reduced in size.

[0007]

According to the present invention, there is provided a ventilating fan for a ceiling comprising a motor, a fan rotated by the motor, and a resin casing for covering the fan in a main body frame. The casing is
While the mouth of the mouse is configured to be open,
The discharge port is provided with a contractible part, and
In the contractible portion, the discharge direction dimension of the open side portion is closed.
It is configured to be larger than the discharge direction dimension of the closed side part.
It has a feature where you are.

[0008]

[0009]

[0010]

According to the above means, since there is provided the shrinkable portion to the discharge port of the casing, when inserting the casing into the main body frame, it may be inserted while the shrinkable portion of the discharge port portion is contracted next In addition, the need for a cushion member can be eliminated.
For this reason, the troublesome work of bonding the cushion member is eliminated, and the number of parts and the manufacturing cost are reduced. And the discharge direction of the open side portion of the contractible portion
Make the dimension larger than the dimension in the discharge direction of the closed side part.
The open side of the shrinkable part is deformed
Even if it is easy to perform, the elasticity of this open side part is not strong enough.
And the open side of the shrinkable part and the opening edge of the exhaust port
Can maintain sufficient adhesion with the
Is less likely to occur.

[0011]

[0012]

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a ventilation fan for a duct will be described below with reference to FIGS. First, in FIG. 1, a duct ventilation fan 13 is mounted on a ventilation fan mounting frame 12 provided on a ceiling plate 11 of a room so as to be located behind the ceiling. The main body frame 14 of the ventilation fan 13 for a duct has a rectangular box shape with an open lower surface, and an exhaust port 15a is formed in one of the side walls 15 (the right side in FIG. 1). Is the exhaust port body 16
Is installed. And, in this exhaust port body 16,
An exhaust duct 17 is connected. The lower surface opening 18 of the main body frame 14 forms an intake port, and a decorative cover (not shown) having a large number of through-holes is detachably attached thereto.

Further, a motor 19 is disposed in the main body frame 14 at a central portion on the upper surface side, and a centrifugal multi-blade fan is provided at a lower end of a rotating shaft 19a of the motor 19. A fan 20 is mounted. Here, a casing 21 made of resin (for example, made of polypropylene) is provided in the main body frame 14 so as to cover the fan 20. The casing 21 has an open top surface, and a discharge port 22 protrudes toward the exhaust port 15a at a portion of the side wall corresponding to the exhaust port 15a, as shown in FIG. It is formed so that.

A contractible portion 23 is provided at the distal end of the discharge port portion 22, and a discharge port 23a and a flange portion 23b are formed at the distal end of the contractible portion 23. Here, as shown also in FIG.
It is composed of a thin portion 24 that protrudes outward and has a cross section that is formed in a mountain shape. This thin part 24
Has a bellows shape, and is configured to be able to contract in the left-right direction in the figure. In addition, a suction port 21a as a bell mouth is formed at the center of the lower surface of the casing 21.
In this case, the side opposite to the bell mouth of the casing 21 (upper side)
Is opened.

When assembling the casing 21 having the above structure to the main body frame 14, the casing 21 is attached to the main body frame 1.
After being inserted into the casing 4, two screws 25 (only one is shown in FIG. 2) are screwed into a through hole of the mounting piece 21 b of the casing 21 and a screw hole (not shown) of the body frame 14 to be tightened. It is configured to be fixed. Here, when the casing 21 is inserted into the main body frame 14, the discharge port 2
The second contractible portion 23 (that is, the thin portion 24) is inserted while being contracted. Thereby, the casing 2
1 is inserted and assembled, the flange 23 b of the contractible portion 23 of the discharge port 22 is connected to the exhaust port 1 of the main body frame 14.
It is configured to be in close contact with the opening edge of 5a.

Therefore, in the above configuration, it is possible to reliably prevent the air from leaking from the contact portion between the discharge port portion 22 and the opening edge of the exhaust port 15a, and furthermore, the conventional configuration (FIGS. 9 to 11). Unlike the case (2), the cushion member can be eliminated. As a result, the troublesome work of bonding the cushion member is eliminated, and the number of parts and the manufacturing cost can be reduced. Further, the casing 2 is contracted while the contractible portion 23 of the discharge port portion 22 is contracted.
1 can be inserted into the main body frame 14, so that the gap D (see FIG. 1) between the casing 21 and the main body frame 14 can be made as small as possible as compared with the conventional configuration. Thus, the internal volume of the casing 21, that is, the expansion rate can be maximized, and the amount of air blown by the fan 20 can be increased.

Further, in the above embodiment, since the contractible portion 23 is constituted by the thin portion 24 provided so as to project outward and to have a mountain-shaped cross section, the contractible portion 23 can be contracted. In doing so, it can be realized with a simple and easy-to-manufacture configuration.

In the above embodiment, the casing 2
Since the anti-bell mouth side of 1 is open, the open side portion (upper side portion) of the contractible portion 23 of the discharge port portion 22 is easily deformed. There is a possibility that air leaks due to poor adhesion to the opening edge.

On the other hand, as in the second embodiment of the present invention shown in FIG.
Of the open side portion 26a is larger than the discharge direction size B of the closed side portion 26b, so that even if the open side portion 26a of the contractible portion 23 is easily deformed. Since the elasticity of the open side portion 26a is increased, the adhesion between the open side portion 26a and the opening edge of the exhaust port 15a is sufficient. Therefore, it is possible to adopt a configuration in which air leakage hardly occurs.
The configuration other than the above is the same as the configuration of the first embodiment.

FIG. 5 shows a third embodiment of the present invention, and the points different from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the third embodiment, as shown in FIG. 5, the opening area of the discharge side portion 27a of the mountain-shaped thin portion 27 is configured to be larger than the opening area of the non-discharge side portion 27b. . Specifically, the height dimension of the discharge side portion 27a (in this case, the height dimension from the outermost protruding portion of the thin portion 27) C1 is the height dimension C2 of the non-discharge side portion 26b.
The configuration is such that a step C3 is provided to be lower than that. With this configuration, the thin portion 27 (the contractible portion 2)
When 3) is contracted and deformed, the opening area of the discharge side portion 27a of the thin portion 27 can be prevented from being reduced as much as possible. As a result, turbulence does not easily occur in the discharge-side portion 27a of the thin portion 27, so that it is possible to prevent the ventilation resistance from increasing.

On the other hand, in the first to third embodiments,
Thin portions 24, 26 of the contractible portion 23 of the casing 21;
Since each of the cross-sections 27 has a mountain-shaped cross section, water may accumulate in each of the mountain-shaped cross sections. In this case, if water accumulates in the mountain-shaped cross section of the thin portions 24, 26, and 27, water may spill from the mountain-shaped cross section when the casing 21 is removed during repair or the like.

On the other hand, as in the fourth embodiment of the present invention shown in FIG. 6, when the thin portion 28 is provided so as to form a tapered shape whose cross section expands, the thin portion 28, that is, the contractible portion 23 is provided.
Can be prevented from accumulating in the water. This prevents water from spilling from the contractible portion 23 of the casing 21 when removing the casing 21 at the time of repair or the like.

FIG. 7 shows a fifth embodiment of the present invention, and the differences from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the fifth embodiment, as shown in FIG. 7, the thin portion 29 is provided so as to form a curl shape (fin shape) whose cross section expands. With this configuration, since the thin portion 28 is easily contracted and deformed, the work of inserting the casing 21 into the main body frame 14 and assembling the casing 21 becomes easy.

In this case, if the curl-shaped thin portion 30 is formed as a double as in the sixth embodiment of the present invention shown in FIG. Since it comes to adhere more fully to the opening edge of the opening 15a, air leakage can be further prevented. Also,
As shown in FIG. 8, the inner thin portion 30 a is formed shorter than the outer thin portion 30 b so as to have substantially the same diameter as the inner diameter of the discharge port portion 22. When it is inserted into the main frame 14, the frictional force when the tip of the inner thin portion 30a comes into contact with the inner surface of the main body frame 14 is reduced, and the work of inserting the casing 21 into the main body frame 14 and assembling it becomes easier. In addition, in the case of the above configuration, since the inner diameter of the inner thin portion 30a is set to be substantially the same as the inner diameter of the discharge port 22, the ventilation resistance of the exhaust air does not increase.

In the sixth embodiment, the curled thin portion 30 is formed in a double structure. However, the present invention is not limited to this. The curled thin portion 30 may be formed in three or more layers. Of course. Even when the thin portion 30 is formed in three or more layers, it is preferable that the innermost thin portion is formed to be shorter than the outermost thin portion so as to have substantially the same diameter as the inner diameter of the discharge port portion. .

[0028]

According to the present invention, as is apparent from the above description, a contractible portion is provided at the discharge port of the casing.
It is possible to prevent air leakage, to eliminate the need for a cushion member, to reduce the number of parts and manufacturing cost, and to achieve an excellent effect of minimizing the gap between the casing and the body frame. In the case of this configuration, the discharge direction dimension of the open side portion of the contractible portion
To be larger than the discharge direction dimension of the closed side part.
The open side of the shrinkable part is easily deformed
Even if it is, the elasticity of this open side part becomes strong enough,
Between the open side portion of the contractible portion and the opening edge of the exhaust port.
Good adhesion can be maintained, thus preventing air leakage.
Can be stopped.

[0029]

[0030]

[0031]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a ventilation fan for a duct showing a first embodiment of the present invention.

FIG. 2 is a partial perspective view of a casing.

FIG. 3 is a vertical side view of a discharge port of a casing.

FIG. 4 is a view corresponding to FIG. 3, showing a second embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 3, showing a third embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 3, showing a fourth embodiment of the present invention;

FIG. 7 is a view corresponding to FIG. 3, showing a fifth embodiment of the present invention;

FIG. 8 is a view corresponding to FIG. 3, showing a sixth embodiment of the present invention;

FIG. 9 is a diagram corresponding to FIG. 1 showing a conventional configuration.

FIG. 10 is a longitudinal sectional side view showing a state when a casing is inserted into a main body frame.

FIG. 11 is a partially exploded perspective view of a casing and a main body frame.

[Explanation of symbols]

13 is a duct ventilation fan (ceiling ventilation fan), 14 is a main body frame, 15 is a side wall portion, 15a is an exhaust port, 19 is a motor, 1
9a is a rotating shaft, 20 is a fan, 21 is a casing, 21
a is an inlet, 22 is a discharge port, 23 is a contractible part, 23
a is a discharge port, 24 is a thin portion, 26 is a thin portion, 26a is an open side portion, 26b is a closed side portion, 27 is a thin portion, 27a
Is an ejection side portion, 27b is an opposite ejection side portion, 28, 29, 3
0 indicates a thin portion.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 7/10 101 F24F 13/02

Claims (1)

(57) [Claims] 1. A ceiling ventilator comprising a main body frame provided with a motor, a fan rotationally driven by the motor, and a resin casing covering the fan, wherein the casing has an open bell mouth side. Like
And a shrinkable part at its outlet.
The contractible portion is provided such that a discharge direction dimension of an open side portion is a closed side.
It is configured to be larger than the discharge direction dimension of the part
A ventilation fan for ceilings.