JPH0531469Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a ventilation fan for ducts with an improved structure for preventing condensation.

(Prior art) Conventionally, in this type of duct ventilation fan, especially those used for bathrooms, the body frame is installed in the ceiling, so the body frame is cooled by the temperature of the air in the ceiling. When the hot and humid air of the bathroom comes into contact with the cooled inner surface of the body frame, condensation occurs, and the dew sometimes drips, making the bather uncomfortable.

Therefore, as shown in Japanese Utility Model Application Publication No. 55-20067, there is a device in which a dew condensation prevention cover made of a heat insulating material is covered on the outside of the main body frame.

(Problem to be solved by the invention) However, in the case of the above-mentioned
A dedicated dew condensation prevention cover is required, and since it is placed on the outside of the main body frame, it has the disadvantage that it is large in volume and costs are considerably high. In addition, the above-mentioned condensation prevention cover placed on the outside of the main body frame must be removed from the main body frame one by one during installation work, and furthermore, it must be reattached to the main body frame in the end, making the work cumbersome. It also had a drawback. In addition, the condensation prevention cover placed on the outside of the main body frame is often damaged by external forces during transportation and handling, which impairs its insulation properties and makes it less effective in preventing condensation. It also had drawbacks.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to reduce the cost, facilitate installation and assembly, and improve the dew condensation prevention effect in preventing dew condensation on the main body frame. It is an object of the present invention to provide an excellent ventilation fan for ducts which can prevent dew condensation and even improve its dew condensation prevention effect.

[Structure of the invention] (Means for solving the problem) The duct ventilation fan of the invention includes a main body frame in the shape of a substantially rectangular box having an intake port on the lower surface and an exhaust port on the other surface, and the main body. A motor disposed inside the frame and a blower blade driven by the motor, an outer surface of which has a shape along the inner surface of the main body frame, has an abutting portion at its lower edge, and surrounds the blower blade inside. a heat insulating body having a portion forming the inner surface shape of the casing, the heat insulating body being inserted into the interior of the main body frame and coming into contact with the inner surface of the main body frame at the abutting portion, whereby the upper portion thereof The main feature is that a gap is formed between the inner surface of the body frame and the inner surface of the body frame.

(Function) According to the above means, it is possible to prevent hot and humid air from a bathroom from coming into contact with the inner surface of the main body frame, which is cooled by the air temperature in the attic. The air layer prevents this. This prevents condensation on the inner surface of the main body frame, and the insulator that does this also serves as a casing that surrounds the blower blades, and is not specifically designed to prevent condensation. Since the device is installed inside the device, its volume can be small. Furthermore, the heat insulating body installed inside the main body frame in this way does not need to be removed every time the installation work is carried out, and therefore there is no need to take the trouble of reattaching it. Further, the outer dimension of the upper side of the heat insulator is smaller than the inner dimension of the main body frame by the gap between the heat insulator and the main body frame, so that the insertability of the heat insulator into the main body frame can be improved. In addition, the heat insulator installed inside the main body frame,
It is not subjected to external force during transportation or handling, so damage can be prevented and good insulation properties can be maintained. The heat insulating body has an outer surface that follows the inner surface of the main body frame, which is approximately rectangular, and has a portion that forms the inner surface of the casing that surrounds the blower blades, thereby creating a large heat insulating layer. The parts are formed at the corners, thereby increasing the heat insulation performance.

(Example) An example of the present invention will be described below with reference to the drawings.

First, in FIG. 1, 1 is the ceiling of a bathroom, for example, 2 is an opening formed in the ceiling 1, 3 is a connecting plate installed exclusively on the back of the ceiling 1 through the right edge of the opening 2 in the figure, and 4 is a vent formed in the connection plate 3,
Reference numeral 5 denotes a connection port body integrated with the connection plate 3 facing the ventilation port 4, and 6 a duct connected to the connection port body 5.

On the other hand, reference numeral 7 denotes a main body frame which passes through the entire remaining area of the opening 2 and is disposed along the connecting plate 3 exclusively at the back of the ceiling 1. It has a substantially rectangular box shape, and an intake port 8 is formed on the bottom surface by an opening that fills the whole surface, and an exhaust port 9 is formed in the form of a circular hole in the upper part of the other surface, in this case the right side surface. This is communicated with the ventilation hole 4 of the connection plate 3. The reference numeral 10 denotes a motor which is installed in advance on the inner upper part of the main body frame 7 by means of a mounting plate 11;
Reference numeral 12 denotes a blower blade attached to the rotating shaft of the motor 10 and disposed at the inner upper part of the main body frame 7.

A heat insulator 13 is made of a heat insulating material such as styrene foam, and its outer surface 14 has a shape along the inner surface of the main body frame 7, that is, a substantially rectangular box shape, as shown in FIGS. 2 and 3. The inside thereof has a portion 15 forming a spiral chamber shape, which is the inner surface shape of a casing surrounding the blowing blade 12. Here, 16 is a suction port for the casing, 17 is a discharge port, and 18 is a flange which is a contact portion formed at the lower edge of the outer surface 14 of the heat insulator and the side edge on the side of the discharge port 17. At this point, this flange portion 18 is set to have approximately the same dimensions as the inner surface of the main body frame 7, and almost all other portions of the outer surface 14 are set to smaller dimensions than the inner surface of the main body frame 7.

Therefore, the heat insulator 13 formed as described above
is installed as shown in FIG. 1 by being press-fitted into the body frame 7 through the intake port 8. In this installed state, most of the outer surface 14 of the heat insulating body 13 and the body frame 7 are Although a gap 19 is created between the flange portion 18 and the inner surface, the flange portion 18 is in close contact with the inner surface of the corresponding portion of the main body frame 7. In this case, an air layer is formed between the body frame 7 and the heat insulator 13 due to the gap 19, and the outer dimension of the upper end of the heat insulator 13 is the same as that of the body frame 7.
The inner dimensions of the heat insulating body 13 are made smaller than the inner dimensions of the heat insulating body 13, thereby making it easier to attach the heat insulating body 13.

Additionally, reference numeral 20 denotes a breathable decorative cover, which is attached to the lower surface of the ceiling 1 so as to cover the air intake port 8 of the main body frame 7.

Now, in the case of the structure as described above, since the main body frame 7 is disposed exclusively behind the ceiling 1, it is cooled by the air temperature behind the ceiling 1, as in the conventional case. However, the heat insulator 13 installed inside the body frame 7 prevents the hot and humid air from the bathroom below the ceiling 1 from coming into contact with the cooled inner surface of the body frame 7. In this way, dew condensation on the inner surface of the main body frame 7 is prevented.
Furthermore, in this case, the presence of the air layer due to the gap 19 makes the heat insulating properties of the heat insulator 13 even more effective, thereby promoting the effect of preventing dew condensation on the inner surface of the main body frame 7. Furthermore, since the heat insulating body 13 itself has heat insulating properties, it will not be cooled even if it comes into contact with the body frame 7, and therefore, even if the inner surface of the heat insulating body 13 comes into contact with the hot and humid air below the ceiling 1, it will not be cooled down. However, since dew does not form, it is possible to prevent dew from dripping and making bathers uncomfortable.

The heat insulating body 13 that performs the dew condensation prevention function as described above has a portion 15 forming the inner surface shape of the casing that surrounds the blower blades 12. It is not a dedicated condensation prevention cover like a dew condensation prevention cover placed on the outside of the frame, and
It is installed inside the main body frame 7, and unlike the conventional dew condensation prevention cover that is placed on the outside of the main body frame, its volume can be reduced, and the cost can also be reduced sufficiently. Can be done. Furthermore, the heat insulating body 13 installed inside the main body frame 7 in this way does not need to be removed every time the installation work is performed, unlike a conventional condensation prevention cover placed on the outside of the main body frame. Reattachment eliminates the need for additional labor, thereby simplifying construction work. In addition, the heat insulating body 13 installed inside the main body frame 7 is not subjected to external force during transportation or cargo handling, thus preventing damage to the heat insulating body 13 and maintaining good heat insulation properties, thereby preventing the aforementioned dew condensation. A sufficient preventive effect can also be obtained without deteriorating it.

In addition, the heat insulator 13 has an outer surface 14 shaped to follow the inner surface of the main body frame 7 having a substantially rectangular box shape, and has a portion 15 forming the inner surface shape of the casing surrounding the blower blades 12 inside. A large portion 21 (see FIG. 2) of the heat insulating layer is formed at the corners, thereby increasing the heat insulating performance and further improving the dew condensation prevention effect.

In the case of the above embodiment, the heat insulator 13 hardly runs along the top surface of the inner surface of the main body frame 1, and there is therefore concern about dew condensation there.
However, since the motor 10 is in contact with it through the mounting plate 11, and the heat of the motor 10 is conducted through the mounting plate 11, there is no need to worry about it being warmed up and causing dew condensation.

However, the heat insulating body 13 may be provided along the top surface of the inner surface of the main body frame 1, and the large portion 21 of the heat insulating layer of the heat insulating body 13 may be either hollow or solid. Furthermore, the heat insulating body 13 may have a tapered shape so that the upper end side is slightly narrower, as long as it is in contact with the inner surface of the main body frame 7 at least at the contact portion exemplified by the flange portion 18.

[Effects of the invention] As is clear from the above description, the duct ventilation fan of the present invention has a main body frame having an approximately rectangular box-like shape, which has an intake port on the lower surface and an exhaust port on the other surface, and this main body. A motor disposed inside the frame and a blower blade driven by the motor, an outer surface of which has a shape along the inner surface of the main body frame, has an abutting portion at its lower edge, and surrounds the blower blade inside. a heat insulating body having a portion forming the inner surface shape of the casing, the heat insulating body being inserted into the interior of the main body frame and coming into contact with the inner surface of the main body frame at the abutting portion, whereby the upper portion thereof The feature is that a gap is formed between the body frame and the inner surface of the body frame, which not only prevents condensation on the body frame, but also reduces costs, simplifies installation work, and improves assembly. It has the excellent effect of improving the dew condensation prevention effect and preventing deterioration of the dew condensation prevention effect, and even improving the dew condensation prevention effect.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a longitudinal sectional view of the whole, FIG. 2 is a perspective view of a single heat insulating body from above, and FIG. 3 is a perspective view of the same from below. In the drawing, 7 is the main body frame, 8 is the intake port, 9 is the exhaust port, 10 is the motor, 12 is the blower blade, 13 is the heat insulator, 14 is the outer surface of the heat insulator, 15 is the inside part of the heat insulator, and 18 is the Flange part (contact part), 19 is a gap,
shows.

Claims (1)

[Scope of utility model registration request] A substantially rectangular box-shaped main body frame having an intake port on the lower surface and an exhaust port on the other surface, a motor disposed inside the main body frame and a blower blade driven by the motor, and an outer surface. a heat insulating body having a shape along the inner surface of the main body frame, having an abutting portion at its lower edge, and having a portion forming the inner surface shape of the casing surrounding the blower blade inside; A ventilation fan for a duct, which is inserted into the inside of a main body frame and comes into contact with the inner surface of the main body frame at the abutting portion, thereby forming a gap between the inner surface of the main body frame and the upper part.