JPH04309738A - Ventilating device - Google Patents

Abstract

PURPOSE:To improve the ventilation efficiency, reduce noise and simplify the structure of a casing by a method wherein air is sucked into an air duct by a sirocco fan and smoothly conducted and transferred by a baffle plate having a porous structure and an air layer is formed on the rear face of the baffle plate. CONSTITUTION:Air in a room is sucked by a sirocco fan 10 horizontally through a duct 1 on the suction side into an air duct 8 of a casing 3 and moved downwards while being conducted by a second baffle plate 15. The room air is also moved horizontally over a flat surface part 12a of a first baffle plate 12 and sent upwards going up a sloping part 12b. The air is then introduced through a sucking opening 9 of a partition wall 6 into a fan chamber 7 and, from there, it is discharged through a duct 2 on the discharge side to the outside. In this way the air can be smoothly transferred through the air duct 8. The baffle plates 12 and 15 having porous structure and air layers 14 and 16 are formed on the rear face thereof, respectively, thereby absorbing the noises produced in the air duct 8 by the sirocco fan 10.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system, and more particularly to a ventilation system installed in the middle of a ventilation path to transfer air within the path from one side to the other.

0002

2. Description of the Related Art A conventional ventilation system of this type is shown in FIG.

FIG. 8 is a sectional view showing this conventional ventilation system.

In the figure, 1 is a suction side duct communicating with an indoor room (not shown), 2 is a discharge side duct communicating with the outside (not shown), and 3 is a casing interposed between the suction side and discharge side ducts 1 and 2. It is. 7 is a fan chamber formed in the casing 3 by a partition wall 6 and communicates with the discharge side duct 2; 8 is approximately L-shaped so as to be adjacent to the fan chamber 7, one end of which is connected to the suction side duct 1; This is an air passage whose other end communicates with the fan chamber 7 via the suction port 9. Further, 10 is installed in the fan chamber 7 and the motor 1
A sirocco fan 101 rotationally driven at 1 is a baffle plate arranged in the air passage 8 so as to be inclined with respect to the suction port 9 of the partition wall 6.

When the ventilation system configured as described above is in operation, indoor air is sucked from the suction side duct 1 into the air passage 8 of the casing 3 by the sirocco fan 10, and is guided to the air guide plate 101. Suction port 9 of partition wall 6
The air is introduced into the fan chamber 7 through the outlet duct 2, and then discharged outside the room through the discharge duct 2. In this way, the indoor air is smoothly guided by the baffle plate 101, so that the ventilation efficiency of the ventilation system is improved.

On the other hand, another conventional ventilation system is shown in FIG. FIG. 9 is a sectional view showing another conventional ventilation device.

In the figure, 111 is a casing of a ventilation system, and 112 and 113 are a pair of partition walls that partition the inside of the casing 111. These partition walls 112 and 113 define a fan chamber 114 and an air passage 115 inside the casing 111. It is formed. A motor 116 is provided on one partition wall 112 and rotates a sirocco fan 117 in the fan chamber 114. A motor 118 is provided on the other partition wall 113 in correspondence with the scirocco fan 117.
4 and the air passage 115 are connected to each other. Also, 1
19 is a sound absorbing material provided on the inner wall of the casing 111 to face the motor 116, and 120 is a sound absorbing material provided on the inner wall of the casing 111 to face the suction port 118.

When the ventilation system configured as described above is in operation, the sirocco fan 117 moves indoor air from the suction side duct (not shown) to the air passage 115 of the casing 111.
The air is sucked into the fan chamber 114 through the suction port 118 of the partition wall 113, and is then discharged outside through a discharge duct (not shown). During this operation, the noise of the motor 116 is absorbed by one of the sound absorbing materials 119, and the noise of the sirocco fan 117 is absorbed by the other sound absorbing material 120.

[0009] As for the former type of ventilation system,
There is one disclosed in Japanese Utility Model Publication No. 1-119048, and the latter type of ventilation device is disclosed in Japanese Utility Model Application Publication No. 2-46099.

0010

[Problem to be Solved by the Invention] The former type of conventional ventilation system is configured to guide indoor air using the baffle plate 101 as described above to improve ventilation efficiency, but it does not do much to reduce noise. Not considered. Conversely, although the latter ventilation device is configured to reduce noise using sound absorbing materials 119 and 120, no measures are taken to improve ventilation efficiency. However, improving ventilation efficiency and reducing noise are issues that have been strongly desired for a long time, and the above two ventilation systems that only solved one of the issues are considered to have sufficient functionality. It was hard to say.

[0011] The latter ventilation system also includes sound absorbing materials 119,
Glass wool and rock wool are used as 120, but since these materials have no rigidity,
As shown in FIG. 9, it was necessary to hold the sound absorbing materials 119 and 120 within the recess 111a of the casing 111 to keep them in a predetermined shape. Therefore, there was a possibility that the structure of the casing 111 would become complicated and the cost would increase.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a ventilation system that can improve ventilation efficiency and reduce noise, as well as simplify the structure of the casing and reduce manufacturing costs. It is.

[0013]

[Means for Solving the Problems] The ventilation device according to the invention of claim 1 has a fan chamber communicating with the discharge side ventilation path, one end side communicating with the suction side ventilation path, and the other end side communicating with the suction side ventilation path. A fan equipped with an air passage that communicates in the orthogonal direction through an opening, and a sirocco fan that introduces the air in the air passage into the fan chamber through an intake opening, is arranged opposite to the intake opening, and has an air outlet on the back side. The air guide plate has a porous structure with layers.

[0014] The ventilation device according to the invention of claim 2 includes, in addition to the ventilation device of the first invention, a drain pan that closes the back side of the baffle plate to form an air layer and is provided with a drain hole. It is.

[0015] The ventilation device according to the invention of claim 3 has a fan chamber communicating with the discharge side ventilation path, one end side communicating with the suction side ventilation path in a direction perpendicular to the suction side ventilation path, and the other end side communicating with the fan chamber through the suction port. and a sirocco fan that introduces the air in the air path into the fan chamber through the suction port, the fan is disposed opposite to the suction side ventilation path and has an air layer on the back side. It is equipped with a porous structure air guide plate.

[0016]

[Operation] In the invention of claim 1, the air in the suction side ventilation path is sucked into the air path by the sirocco fan, passes through the air path, and then passes through the suction port while being guided by the baffle plate into the fan chamber. is introduced into the outlet and discharged into the outlet ventilation path,
In this way, the air moves smoothly through the guidance of the baffle plate, and since the baffle plate has a porous structure with an air layer on the back, noise is absorbed. It is easy to install due to its rigidity.

In the invention of claim 2, in addition to the effect of the first invention, the condensed water generated in the air passage passes through the porous structure baffle plate, is received by the drain pan, and is drained from the drain hole. It is discharged to the outside.

In the invention of claim 3, the air in the suction side ventilation path is sucked into the air path by the sirocco fan while being guided by the baffle plate, and after passing through the air path, it is introduced into the fan room through the suction port. is discharged into the outlet ventilation path,
In this way, the air moves smoothly through the guidance of the baffle plate, and since the baffle plate has a porous structure with an air layer on the back, noise is absorbed. It is easy to install due to its rigidity.

[0019]

【Example】

<First example>

A first embodiment embodying the first and third inventions will be described below.

FIG. 1 is a sectional view showing a ventilation system according to a first embodiment of the present invention, and FIG. 2 is a perspective view of a cover in the ventilation system according to a first embodiment of the present invention.

In the figure, 1 is a suction side duct as a suction side ventilation path communicating with the indoor room (not shown), and 2 is a discharge side ventilation path facing the suction side duct 1 on the same line and communicating with the outside (not shown). The discharge side duct 3 is box-shaped and opens downward, and is connected to the suction side and discharge side duct 1.
, 2, the inlet 3a of the casing 3 is connected to the suction side duct 1, and the outlet 3b is connected to the suction side duct 1.
is connected to the discharge side duct 2.

A cover 4 is shaped like a shallow box with an upward opening, and is removably attached to the opening of the casing 3 from below with screws 5;
The fan chamber 7 is in communication with the discharge side duct 2. Further, the air passage 8 is approximately L
It is shaped like a letter and is adjacent to the fan chamber 7, one end of which communicates with the suction side duct 1 in the orthogonal direction, and the other end of which communicates with the fan chamber 7 through a suction port 9 formed in the partition wall 6. They communicate in the orthogonal direction. In other words, the suction side duct 1,
The path consisting of the air passage 8 and the fan chamber is formed by bending at a right angle between the suction side duct 1 and one end of the air passage 8, and similarly, the path consisting of the air passage 8 and the fan chamber is bent at a right angle. It is also formed by bending at right angles in between. 10 is rotationally driven in the fan chamber 7 by a motor 11, and passes through the suction port 9 to the air passage 8.
This is a sirocco fan that introduces air inside the fan chamber 7.

Reference numeral 12 denotes a first air guide plate that is attached to the upper part of the cover 4 with screws 13 and is placed opposite to the suction port 9 of the partition wall 6. This first air guide plate 12 is attached to the suction side It is composed of a flat part 12a and an inclined part 12b on the discharge side,
The boundary between the flat part 12a and the inclined part 12b is located on the rotation axis of the sirocco fan 10, and the end of the inclined part 12b is in contact with the discharge side of the suction port 9 in the partition wall 6. The first baffle plate 12 can be removed from the casing 3 together with the cover 4.

[0025] Further, 14 is a first
This is the first air layer formed on the back surface of the baffle plate 12. Reference numeral 15 designates a second baffle plate which has a gently curved plate shape and is disposed in the air passage 8 to face the suction side duct 1, one end of which is in contact with the upper surface of the inside of the casing 3, and the other end of which is in contact with the upper surface of the casing 3; The end is in contact with the lower side surface of the partition wall 6. Further, 16 is a second air layer provided on the back surface of the second baffle plate 15.

FIG. 3 is a partially enlarged view of the first baffle plate in the ventilation system according to the first embodiment of the present invention.

As shown in the figure, the first baffle plate 12 is
It is constructed by assembling a large number of spherical pellets P made of BS resin, and has a porous structure containing a large number of voids S. The outline of the manufacturing method will be explained below. Air bubbles are mixed in the pellets P used in advance, and the pellets P are first filled into a mold in which a cavity corresponding to the first baffle plate 12 is formed. Then, the pellet P is heated together with the mold. As the surface of the pellet P melts, the air bubbles inside expand and the adjacent pellets P come into pressure contact with each other. As a result, each pellet P welds to each other with a gap S formed therein, and then, when cooled, the first The baffle plate 12 is completed.

The second baffle plate 15 is also manufactured in exactly the same manner as the first baffle plate 12, and has a porous structure made of ABS resin.

Next, the operation of the ventilation system of this embodiment configured as described above will be explained.

When the ventilation system is in operation, room air is sucked horizontally by the sirocco fan 10 from the suction side duct 1 into the air passage 8 of the casing 3.
The direction of movement is changed downward while being guided by the baffle plate 15. Thereafter, the indoor air is transferred to the flat part 1 of the first baffle plate 12.
2a, the moving direction is changed upward while being guided by the inclined part 12b, and the fan chamber 7 is introduced through the suction port 9 of the partition wall 6, and is discharged outside through the discharge side duct 2. .

[0031] In this way, the direction of movement of the indoor air is once changed downward in the air passage 8, and then the direction of movement is changed upward and introduced into the fan chamber 7 through the suction port 9. When it is changed downward, it is guided by the second air guide plate 15, and similarly, when it is changed upward, it is guided by the first air guide plate 1.
2, the indoor air moves smoothly within the air passage 8.

[0032] Furthermore, the first and second baffle plates 12, 1
5 has a porous structure and has a sound absorbing effect, and the sound absorbing effect is achieved by an air layer 14 provided on the back side of the baffle plates 12 and 15.
16, the noise generated in the air passage 8 by the sirocco fan 10 and the like is absorbed. In particular, since the flat portion 12a of the first baffle plate 12 faces the sirocco fan 10 via the suction port 9 of the partition wall 6, it is possible to effectively absorb sound. Note that the frequency of noise that can be absorbed changes depending on the thickness of the air layers 14 and 16, so the air layer 14 is adjusted so that the frequency has the greatest sound absorption effect.
, 16 are adjusted.

Furthermore, the first and second baffle plates 12,1
5 is made of ABS resin and has rigidity, so it is only necessary to arrange it in the air passage 8 of the casing 3 and fix it with screws 13 or the like. Therefore, the casing 3 has a baffle plate 12.
, 15 in a predetermined shape.

As described above, the above embodiment includes a fan chamber 7 provided in the casing 3 interposed between the suction side and discharge side ventilation paths 1 and 2, and communicating with the discharge side ventilation path 2; Approximately L is provided in the casing 3, one end side communicates with the suction side ventilation path 1 in the orthogonal direction, and the other end side communicates with the fan chamber 7 in the orthogonal direction via the suction port 9.
a porous fan made of ABS resin; a first air guide plate 12 having a structure and arranged opposite to the suction port 9 in the air passage 8 to guide indoor air in the air passage 8 to the suction port 9; A first air layer 14 provided on the back surface of the plate 12 has a porous structure made of ABS resin, and is arranged opposite to the suction side duct 1 in the air passage 8 to form an inner space of the suction side duct 1. It includes a second air guide plate 15 that guides air into the air passage 8, and a second air layer 16 provided on the back surface of the second air guide plate 15.

[0035] Therefore, the first and second baffle plates 12,
15, indoor air moves smoothly within the air passage 8, and the ventilation efficiency of the ventilation system can be greatly improved.

Further, the noise generated in the air passage 8 is absorbed by the first and second baffle plates 12 and 15 having a porous structure, thereby making it possible to reduce the noise of the ventilation system.

Furthermore, since the first and second baffle plates 12 and 15 are molded with ABS resin to give them rigidity, they do not require a special structure to hold the baffle plates in a predetermined shape like a conventional casing. is not required at all, the structure of the casing 3 can be simplified and manufacturing costs can be reduced.

〈Second Example〉

A second embodiment embodying the first and third inventions will be described below.

FIG. 4 is a perspective view of a cover in a ventilation system according to a second embodiment of the present invention. Note that the overall configuration of the ventilation system of this embodiment is the same as that of the ventilation system described in the first embodiment. In particular, in this embodiment, differences will be emphasized.

Reference numeral 21 denotes a first baffle plate attached to the upper part of the cover 4 with screws 22, and this first baffle plate 21 is composed of a flat part 21a on the suction side and an inclined part 21b on the discharge side. A flange portion 21c is erected in a semicircular shape on the inclined portion 21b. Similar to the first embodiment, the first baffle plate 21 has a porous structure in which a large number of ABS resin pellets are welded to each other, and although not shown, is arranged opposite to the inlet of the partition wall. ing.

When the ventilation system configured as described above is in operation, the first baffle plate 21 guides indoor air in the air passage to improve ventilation efficiency, as in the first embodiment. At the same time, it is possible to absorb noise in the air passage and achieve noise reduction.

The first air guide plate 21 of this embodiment has a more complicated shape than the first air guide plate 12 of the first embodiment, but as described above, it is made of ABS resin. Since the pellets are welded and integrally molded, it can be manufactured using the same number of steps as the first embodiment.

<Third Example>

A third embodiment embodying the first and third inventions will be described below.

FIG. 5 is a partially cutaway perspective view of a casing in a ventilation system according to a third embodiment of the present invention, and FIG. 6 is a perspective view of a second baffle plate in a ventilation system according to a third embodiment of the present invention. Note that the overall configuration of the ventilation system of this embodiment is the same as that of the ventilation system described in the first embodiment. In particular, in this embodiment, differences will be emphasized.

Reference numeral 31 denotes a bracket provided in the air passage 8 of the casing 3; 32 is disposed in the air passage 8 to face a suction side duct (not shown); flange portions 32a formed on both sides are attached to the bracket 31; This is a second baffle plate fixed with screws 33. This second baffle plate 32 is formed in a three-dimensional shape with only the suction side duct side and the lower side open,
Similar to the first embodiment, it has a porous structure in which a large number of ABS resin pellets are welded together.

When the ventilation system configured as described above is in operation, the second baffle plate 32 guides indoor air within the air passage 8 and absorbs noise. However, since this second baffle plate 32 has a three-dimensional shape rather than a simple plate shape like the baffle plate 15 of the first embodiment, it can circulate indoor air more smoothly. In addition to improving ventilation efficiency, it is also possible to further improve sound absorption and reduce noise.

<Fourth Example>

A fourth embodiment embodying the invention of claim 2 will be described below.

FIG. 7 is a sectional view showing a ventilation system according to a fourth embodiment of the present invention. Note that the overall configuration of the ventilation system of this embodiment is the same as that of the ventilation system described in the first embodiment. In particular, in this embodiment, differences will be emphasized.

Reference numeral 41 denotes a drain dish which has a shallow box shape with an upward opening and is removably attached to the opening of the casing 3 from below with screws 42, and the bottom surface 41a of this drain dish 41 faces toward the discharge side. slanted downward. Also, 4
3 is a drain hole provided on the downstream side of the bottom surface 41a of the drain dish 41 and communicating with the outside. This drain dish 41 forms a first air layer 14 on the back surface of the first baffle plate 12, similar to the cover 4 of the first embodiment.

[0053] When the ventilation system configured as described above is in operation, the indoor air is guided in the air passage 8 by the first baffle plate 12 and its movement is prevented, as in the first embodiment. This is carried out smoothly, and the noise within the air passage 8 is absorbed by the first baffle plate 12.

[0054] Also, as in the first embodiment, the first air guide plate 12 is molded from ABS resin and has rigidity, so it is fixed in the air passage 8 of the casing 3 with screws 13 or the like. Just that is enough.

Furthermore, when this ventilation system is installed in a bathroom or the like, water vapor generated in the bathroom will pass through the air passage 8, and condensed water will be generated in the air passage 8. passes through the first baffle plate 12 having a porous structure and drains into the drain pan 41.
and is reliably discharged to the outside from the drain hole 43 via a drain hose (not shown).

As described above, the above embodiment has a fan chamber 7 which is provided in the casing 3 interposed between the suction side and discharge side ventilation paths 1 and 2, and which communicates with the discharge side ventilation path 2, and a substantially L-shaped air passage 8 provided in the casing 3, one end communicating with the suction side ventilation passage 1 and the other end communicating with the fan chamber 7 in a perpendicular direction via the suction port 9; A sirocco fan 10 is installed in the fan chamber 7 and introduces indoor air in the air passage 8 into the fan chamber 7 through the suction port 9. a first baffle plate 12 which is arranged opposite to the suction port 9 and guides the indoor air in the air passage 8 to the suction port 9; The back surface of the first baffle plate 12 is closed and a first air guide plate is formed inside.
The drain plate 41 is provided with a drain hole 43 on the downstream side of the bottom surface 41a.

[0057] Therefore, the indoor air is guided by the first baffle plate 12 and moves smoothly within the air passage 8, making it possible to greatly improve the ventilation efficiency of the ventilation system.

Further, the noise generated in the air passage 8 is absorbed by the first baffle plate 12 having a porous structure, thereby making it possible to reduce the noise of the ventilation system.

Furthermore, since the first baffle plate 12 has rigidity, there is no need for any special structure on the casing 3 side to hold the baffle plate 12 in a predetermined shape. It is possible to simplify the structure and reduce manufacturing costs.

On the other hand, when this ventilation system is installed in a bathroom or the like, the condensed water generated in the air passage 8 is reliably discharged to the outside from the drain hole 43, so that the inside of the ventilation system is not corroded by the condensed water. Various problems such as condensed water leaking from the ventilation system and dripping can be prevented.

[0061] By the way, in the above embodiment, the ventilation device is installed between the suction side and discharge side ducts 1 and 2 and exhausts indoor air to the outside. There are no limitations, and any device may be used as long as it is installed in the middle of the ventilation route and can transport the air in the route from one side to the other. Therefore, for example, it may be embodied as a ventilation device that introduces outdoor air into a room.

[0062] Furthermore, the first to third embodiments are similar to the first and second embodiments.
The fourth embodiment has been realized as a ventilation system equipped with all of the first air guide plates 12, 15, 21, and 32, and the fourth embodiment has been realized as a ventilation apparatus equipped with only the first air guide plate 12. In this case, the present invention is not limited to this, and it is sufficient to provide one of the first and second air guide plates 12, 15, 21, and 32. Therefore, for example, it may be implemented as a ventilation device including only the second baffle plates 15 and 32.

Furthermore, the air guide plate of the above embodiment has first and second air guide plates 1 formed by welding a large number of pellets P to each other.
2, 15, 21, and 32, but when implementing the present invention, it is not limited to this,
Any material may be used as long as it has a sound absorbing effect and can guide indoor air within the air passage 8. Therefore, for example, it may be configured as a porous air guide plate that is injection molded from a synthetic resin material containing a foaming agent.

[0064]

As described above, the ventilation system of the invention according to claim 1 has a fan chamber that communicates with the discharge side ventilation path, one end side that communicates with the suction side ventilation path, and the other end that communicates with the suction side ventilation path. an air passage that communicates with each other in the orthogonal direction through the opening, a sirocco fan that introduces the air in the air passage into the fan chamber through the suction opening, and a porous structure made of a synthetic resin material; Since the air guide plate is arranged opposite to the suction port and guides the air in the air path to the suction port, and the air layer is provided on the back side of the air guide plate, the suction side ventilation is prevented during operation. The air in the route is sucked into the air duct by a sirocco fan and passes through the air duct, then guided by the baffle plate and introduced into the fan room through the suction port and discharged into the outlet ventilation route. The guide of the baffle plate allows air to move smoothly and improve ventilation efficiency, and the baffle plate has a porous structure with an air layer on the back, which absorbs noise. In addition, since the baffle plate has rigidity, it is easy to install, and the structure of the casing can be simplified to reduce manufacturing costs.

[0065] Further, the ventilation device of the invention of claim 2 is the ventilation device of the invention of claim 1, in which the back side of the baffle plate is closed to form an air layer inside, and a drain plate is provided with a drain hole. Because of this, condensed water generated in the air channel passes through the porous-structured baffle plate, is received by the drain pan, and is discharged to the outside from the drain hole, preventing various problems caused by this condensed water. It can be prevented.

Furthermore, in the ventilation device of the invention of claim 3, a fan chamber communicating with the discharge side ventilation path, one end side communicating with the suction side ventilation path in a direction perpendicular to the suction side ventilation path, and the other end side communicating with the fan chamber through the suction port. an air passage communicating with the room; a sirocco fan that introduces air in the air passage into the fan room through the suction port; The air guide plate is arranged opposite to the air guide plate and guides the air in the suction side ventilation path into the air path, and the air layer is provided on the back side of the air guide plate. The air in the route is sucked into the air channel by the sirocco fan while being guided by the baffle plate, and after passing through the air channel, it is introduced into the fan room through the suction port and is discharged into the outlet ventilation route. Guided by the baffle plate, air can move smoothly to improve ventilation efficiency, and the baffle plate has a porous structure with an air layer on the back, which absorbs and reduces noise. In addition, since the baffle plate has rigidity, it is easy to install, and the structure of the casing can be simplified to reduce manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a ventilation device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a cover in a ventilation system according to a first embodiment of the present invention.

FIG. 3 is a partially enlarged view of the first baffle plate in the ventilation system according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a cover in a ventilation device according to a second embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a casing in a ventilation system according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a second baffle plate in a ventilation system according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing a ventilation device according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a conventional ventilation device.

FIG. 9 is a sectional view showing another conventional ventilation device.

[Explanation of symbols]

1 Suction side duct (Suction side ventilation route) 2 Discharge side duct (Discharge side ventilation route) 3 Casing 7 Fan chamber 8 Air path 9 Suction port 10 Sirocco fan 12, 21 First baffle plate 14 First air layer 15 , 32 Second baffle plate 16 Second air layer 41 Drain pan 41a Bottom surface 43 Drain hole

Claims (3)

[Claims] 1. A fan chamber provided in a casing interposed between a suction side and a discharge side ventilation path and communicating with the discharge side ventilation path; and a fan chamber provided in the casing, one end of which is connected to the suction side ventilation path. an air passage that communicates with the air passage and whose other end communicates with the fan chamber in a perpendicular direction through an inlet; and an air passage that is disposed within the fan chamber and introduces the air in the air passage into the fan chamber through the suction opening. a sirocco fan that has a porous structure made of a synthetic resin material, and is disposed in the air passage in opposition to the suction port to guide air in the air passage to the suction port; and the air guide plate A ventilation device characterized by comprising: an air layer provided on the back side of the ventilator. [Claim 2] It has a box shape with an upward opening and an inclined bottom surface, and the back surface of the baffle plate is closed to form an air layer inside,
The ventilation device according to claim 1, further comprising a drain pan having a drain hole provided on the downstream side of the bottom surface. 3. A fan chamber provided in a casing interposed between a suction side and a discharge side ventilation path and communicating with the discharge side ventilation path; and a fan chamber provided in the casing, one end of which is connected to the suction side ventilation path. an air path that communicates in a direction perpendicular to the fan chamber and whose other end communicates with the fan chamber via an inlet; a sirocco fan having a porous structure made of a synthetic resin material, and an air guide plate that is disposed in the air passage to face the suction side ventilation passage and guides air in the suction side ventilation passage into the air passage. , and an air layer provided on the back surface of the baffle plate.