JPH035650A - Ventilating fan for duct - Google Patents

Abstract

PURPOSE:To prevent the generation of dew condensation in the inside of a mainbody frame and improve ventilating performance by a method wherein an insulating body is installed along the inner circumferential surface, a double blades type fan of which blades are extended at the air suction diode side and the opposite side is formed in the inside of a mainbody frame, and an air flow passage ventilating air to the blade parts is formed in the insulating body. CONSTITUTION:By the start of a motor 14 a double blades type fan 15 is started to rotate and by the main blades parts 15a at the air suction hole 4 side, air of a bath room, etc., under a ceiling 1 is sucked from the hole 4 through ventilating holes 24 of a decorative panel 23 and further, sucked into an lower insulating body 10 through the suction hole 17 of the body 10. Air is exhausted outdoor from an exhaust hole 5 through the exhaust hole 6 of a connecting plate 7 and a duct 8. Simultaneously, by the auxiliary blades parts 15b at the opposite side of the air suction, air is exhausted outdoor from the hole 5 through the hole 6 of the plate 7 and the duct 8 as before. The air with high temp. and humidity from the bath room under the ceiling 1 entering into the frame 3 in the operation or stop time of the ventilator is prevented from touching to the inner surface by the insulating structure due to both insulating bodies 9, 10 in the upper and lower parts set up along the inner circumferential surface of the frame 3 and the generation of dew condensation in the frame 3 can be prevented.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a duct ventilation fan with measures against condensation.

(Prior art) Conventionally, in this type of duct ventilation fan, especially in bathroom duct ventilation fans, the main frame installed in the ceiling is generally cooled by the air in the ceiling, and the cooled main body frame is cooled by the air in the ceiling. There is a problem in that dew condensation occurs when the hot and humid air of the bathroom comes into contact with the inner surface of the bathtub, and the dripping of the dew makes the bather uncomfortable.

Therefore, by arranging a heat insulator along the inner peripheral surface of the body frame inside the body frame, the heat insulation structure prevents the hot and humid air from coming into contact with the inner surface of the body frame, thereby preventing the formation of dew condensation. it was thought.

(Problem to be solved by the invention) However, even with a heat insulator as described above,
Although the fan is not equipped with a heat insulating body, it is still the same as a fan, and has the problem that only a commensurate ventilation performance can be obtained.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent dew condensation from forming on the inner surface of the main body frame, to further improve ventilation performance, and to do so in a more rational manner. The purpose is to provide an excellent duct ventilation fan that can be achieved with a structure.

[Structure of the Invention] (Means for Solving the Problems) The duct ventilation fan of the present invention has a heat insulating structure along the inner circumferential surface of the body frame, which has an intake port on the lower surface and an exhaust port on the side surface. A double-blade fan having a wing portion on the intake port side and a wing portion on the counter-intake port side and a motor for driving the same are provided in the heat insulating body from the intake port. The present invention is characterized in that a ventilation path is formed in the blade portion of the fan on the side opposite to the intake port.

In this case, if the body frame is formed in the shape of a rectangular box and the heat insulator has an outer surface that follows the inner peripheral surface of the body frame and an inner surface that is formed in the shape of a casing that surrounds the fan, the ventilation path may be It is best to form it at the corner of the heat insulator.

Further, in the case where the heat insulating body is fixed to the main body frame by a holding member, it is even better if the holding member also serves as a member for holding a spring for attaching the decorative panel.

(Function) According to the above-mentioned means, contact of hot and humid air to the inner surface of the main body frame can be basically prevented by the heat insulating structure of the heat insulating body along the inner circumferential surface of the main body frame.

Further, since the fan has a double-blade shape, it is possible to increase the air volume.

Also, in this case, the blades on the intake port side of the double-blade fan take in air directly from the intake port on the bottom surface of the main body frame, whereas the wings on the side opposite to the intake port take air in through the ventilation passage formed in the heat insulator. By allowing air to be taken into the wing portion on the side opposite to the intake port through the heat insulator, it is possible to more reliably prevent hot and humid air from coming into contact with the inner surface of the main body frame.

Furthermore, the body frame is formed into a rectangular box shape, and the heat insulator has an outer surface that follows the inner peripheral surface of the body frame, and an inner surface that is formed in the shape of a casing that surrounds the fan. When the insulation body is formed at a corner of the body, a ventilation passage can be formed in addition to the so-called thinning of the insulation body, and the material used for the insulation body can be reduced and the weight can be reduced.

In addition, in cases where the heat insulator is fixed to the main body frame by a holding member, and the holding member also serves as a member for holding the spring for attaching the decorative panel, the price can be reduced by sharing parts. It is possible to achieve improvements in assembly and ease of assembly.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

First, in FIG. 2 showing the installation state of the duct ventilation fan, the main body frame 3 attached to the ceiling 1 via the wooden frame 2 is made of, for example, plastic, and the lower surface has an air intake port 4 formed by an opening in the metal plate area. It is formed into a rectangular box shape with an exhaust port 5 formed by a rectangular hole as shown in FIG. A duct 8 shown in FIG. 2 is communicated via a connecting plate 7.

Inside the main body frame 3, there is an appeal heating element 9 made of styrofoam, for example.
and a lower heat insulating body 10 also made of polystyrene foam, of which the appeal heating element 9 is attached to the lower heat insulating body along the upper surface part and the upper part of the circumferential side part of the inner peripheral surface part of the main body frame 3. 1
0 is along most of the remaining part of the circumferential side surface. A motor mounting plate 11 is arranged between these two heat insulators 9 and 10, and is screwed to a motor fixing metal fitting 12 arranged on the main body frame 3 to fix the motor mounting plate 11 to the main body frame 3. ing.

A motor 14 is attached to the motor mounting plate 11 by screwing it to the bellmouth-shaped vent 13 in the center.
5a and a double wing-shaped fan 15 having an auxiliary wing portion 15b on the side opposite to the intake port 4 is attached. Here, both the heat insulators 9,
As shown in FIGS. 3 and 4, the lower heat insulator 10 has an inner surface shaped like a casing that surrounds the fan 15, and an outer surface shaped to follow the inner peripheral surface of the main body frame 3. is forming. In each of the triangular corners of the upper surface, a ventilation passage 16 that opens vertically is formed.
The motor mounting plate 11 is designed to have a shape that is only slightly larger than the planar shape of the casing, for example, without blocking it. In addition, a suction port 17 is formed in the lower part of the lower heat insulator 10, and a four-striped part 18 is formed on the outer side surface, which is fitted into a convex striped part 19 formed on the inner side surface of the main body frame 3. The lower edge of the outer surface is formed with a convex portion 20 around the entire circumference of the V, and is pressed against the inner circumferential surface of the main body frame 3 and crushed.

Below the lower heat insulator 10, in the intake port 4 portion of the main body frame 3,
A long holding member 21 is attached to the protruding portion 19 by screwing, thereby fixing the lower heat insulator 10 to the main body frame 3 from below. In addition, the holding member 21 holds a spring 22, and the spring 22 holds the air intake port 4 of the main body frame 3 to the ceiling.
A decorative panel 23 is attached to cover from below. Note that the decorative panel 23 has a large number of ventilation holes 24 formed throughout its entire area.

Now, in the case of the configuration as described above, when the motor 14 is started, the double-blade fan 15 is driven to rotate, and the main wing part 15a on the side of the intake port 4 blows air from the bathroom under the ceiling 1, etc. As shown by arrow A in FIG.
3 from the intake port 4 through the ventilation hole 24 of the lower insulation body 1.
The air is sucked into the lower heat insulating body 10 through the suction port 17 of 0, and is discharged outdoors through the exhaust port 5 and the exhaust hole 6 of the connection plate 7 and the duct 8. At the same time, the secondary wing part 15b on the side of the counter-intake [4] also draws the air from the bathroom, etc. under the ceiling 1 through the ventilation hole 24 of the decorative panel 23 to the lower insulation body, as shown by arrow B in the same figure. 10 through the ventilation passages 16, and further into the lower insulation body 10 through the ventilation hole 13 of the motor mounting plate 11, and similarly from the exhaust hole 5 to the connection plate 7.
It is discharged outdoors through the exhaust hole 6 and duct 8.

During such operation or when the operation is stopped, the hot and humid air that enters the main body frame 3 from the bathroom under the ceiling 1, etc. basically
Both upper and lower insulators 9, 1 along the inner peripheral surface of the main body frame 3
0 prevents contact with the inner surface of the main body frame 3, thereby preventing dew condensation on the inner surface of the main body frame 3.

Further, as described above, the ventilation operation can be performed by the same action of intake and exhaust by the main wing part 15a of the double-wing fan 15 and intake and exhaust by the secondary wing part 15b. It is possible to operate with a larger air volume than with a fan, and it is possible to achieve improved ventilation performance. Furthermore, in this case, the cooling effect of the motor 14 due to the wind can be improved, and its life can be extended.

The main wing portion 15a of the double-blade fan 15 is connected to the main body frame 3.
Air is taken directly from the intake port 4 of the secondary wing section 15.
b is for taking in air through the ventilation passage 16 formed in the lower insulator 10, and the intake air to this secondary wing part 15b is taken in through the lower insulator 1.
By passing through the inside of the main body frame 3, the intake air can be prevented from coming into contact with the inner surface of the main body frame 3, and dew condensation on the inner surface of the main body frame 3 can be more reliably prevented.

On the other hand, the main body frame 3 is formed in a rectangular box shape, and the lower heat insulator 10 has an outer surface shaped to follow the inner peripheral surface of the main body frame 3, and an inner surface formed in the shape of a casing surrounding the fan 15,
By forming the ventilation passages 16 at the corners of the lower insulation body 10, the ventilation passages 16 can be formed in conjunction with the so-called thinning of the lower insulation body 10, and the material of the insulation body can be reduced and the weight can be reduced. can be achieved.

In addition, since the lower heat insulating body 10 is fixed to the main body frame 3 by a presser member 21, and the presser member 21 also serves as a member for holding the spring 22 for attaching the decorative panel 23, It is possible to share parts, thereby reducing costs and improving ease of assembly.

In addition, by dividing the heat insulator into the upper heat insulator 9 and the lower heat insulator 1°, the motor mounting plate 11 can be easily assembled, and the lower edge of the outer surface of the lower heat insulator 10 can be Convex portion 2
0 and is pressed into contact with the inner peripheral surface of the main body frame 3, it is possible to prevent even a small amount of hot and humid air from entering between the inner surface of the main body frame 3 and the outer surface of the lower heat insulator 10. Further, due to the pressure welding, it is possible to absorb variations in dimensions between the main body frame 3 and the lower heat insulator 10, and it is also possible to obtain effects such as ease of assembly.

Although one embodiment of the present invention has been described above, the present invention is not limited thereto, and in particular, the lower heat insulator 10 of the above embodiment in which the lower heat insulator 10 is along most of the circumferential side surface of the inner circumferential surface portion of the main body frame 3. In such a case, the heating element 9 may not be provided as long as it is used in a place where the air temperature behind the ceiling 1 is relatively high.

In addition, the present invention may be implemented with appropriate modifications within the scope of the invention.

[Effects of the Invention] The present invention is as described above, and has the following effects.

In the duct ventilation fan according to claim 1, a heat insulator is disposed along the inner peripheral surface of the body frame having an intake port on the lower surface portion and an exhaust port on the side surface portion, and a heat insulator is provided on the side of the intake port. A double-blade fan having a wing portion and a wing portion on the side opposite to the intake port and a motor for driving the same are disposed in the heat insulator, and ventilation is provided from the air intake port to the blade portion on the side opposite the intake port of the fan in the heat insulator. Because of this, we created a ventilation path that prevents condensation from forming on the entire inner surface of the main body frame, and even in the ventilation path.
Furthermore, improvement in ventilation performance can be achieved by itself.

In the duct ventilation fan according to claim 2, in the above structure, the main body frame is formed in a rectangular box shape, and the heat insulating body has an outer surface that follows the inner circumferential surface of the main body frame, and an inner surface that has a casing shape that surrounds the fan. Since the ventilation passages were formed at the corners of the insulation body, the ventilation passages could be formed in conjunction with the so-called meat stealth of the insulation body, reducing the material used for the insulation body and making it lighter. can be achieved.

In the duct ventilation fan according to claim 3, the heat insulating body is fixed to the main body frame by a holding member, and the holding member also serves as a member for holding a spring for attaching the decorative panel. , parts can be shared, and benefits such as lower prices and improved ease of assembly can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
FIG. 2 is a longitudinal sectional view taken along line I-1 in the figure, FIG. 2 is a longitudinal sectional view taken along line 1--2, FIG. 3 is an exploded perspective view, and FIG. In the drawing, 3 is the main body frame, 4 is the intake port, 5 is the exhaust port, 10 is the lower heat insulator (insulator), 14 is the motor, 15 is the fan, 1
5a is the main wing part (the wing part on the inlet side), 15b is the secondary wing part (the wing part on the side opposite to the inlet port), 16 is the ventilation passage, 21 is the holding member, 2
2 is a spring, and 23 is a decorative panel.

Claims (1)

[Scope of Claims] 1. A heat insulating body is disposed along the inner circumferential surface of the body frame having an intake port on the lower surface and an exhaust port on the side surface, and a wing portion on the side of the intake port. and a double-blade-shaped fan having a wing portion on the side opposite to the intake port, and a motor for driving the same, and a fan having a double-blade shape having a wing portion on the side opposite to the intake port, and a motor for driving the same, and a fan having a blade portion on the side opposite to the intake port of the fan from the intake port in the heat insulator. A duct ventilation fan characterized by forming a ventilation path for ventilation. 2. The body frame is formed into a rectangular box shape, and the heat insulating body has an outer surface that follows the inner peripheral surface of the body frame, and an inner surface that is formed in the shape of a casing that surrounds the fan, and the heat insulating body is used to insulate the ventilation passage. Claim 1 characterized in that it is formed at a corner of the body.
Ventilation fan for the duct as described. 3. The duct ventilation fan according to claim 1, wherein the heat insulator is fixed to the main body frame by a holding member, and the holding member also serves as a member for holding a spring for attaching the decorative panel.