JP2022100794A - Ventilation unit and ventilation system - Google Patents

Abstract

To provide a ventilation unit and a ventilation system that enables an inner frame to be smoothly attached and suppress damage to an inner surface of an outer frame.SOLUTION: Ventilation structure 2 is configured to suck and ventilate air in a room 3 by connecting an opening part 8 formed in a wall material 7 provided on a wall surface in the room and a ventilation duct 12. The ventilation structure 2 is provided between the opening part 8 of the wall material 7 and a ventilation duct side opening part 15A drawn and placed in the vicinity of the opening part 8, and the ventilation structure comprises: an outer frame 20 that communicates both opening parts 8 and 15A; an inner frame 30 to which a dust filter 33 is replaceably attached, which is attached to the outer frame 20 so that the outer frame can be freely taken in and out from a front side; and a lock mechanism 40 that locks the inner frame 30 with respect to the outer frame 20. The lock mechanism 40 comprises: a lock member 43 provided on the outer frame 20, in which a protruding piece 43A having an outer surface formed into a curved surface is elastically urged to freely appear and disappear; and a hole 45 that is provided in the inner frame 30 for receiving the protruding piece 43A of the lock member 43.SELECTED DRAWING: Figure 4

Description

The present invention relates to a ventilation unit such as a toilet and a ventilation system (hereinafter, also referred to as a ventilation structure) used by an unspecified number of people.

In the toilet, an opening for ventilation is provided in the lumber provided between the wall material that defines the interior of the toilet and the floor, and this opening is connected to the ventilation duct via a branch pipe, and the ventilation duct and other parts are used. There is a ventilation structure in which the ends are communicated to the outside and forced exhaust is performed by a ventilation fan (see, for example, Patent Document 1).

In such a ventilation structure, a ventilation box is connected to the opening end of the branch pipe, and this ventilation box is placed on the back side to match the shape of the opening of the skirting board, and this ventilation box is provided for dust protection. A net body is provided. If the net is clogged with dust due to long-term use, the ventilation performance will deteriorate. Therefore, if the net is found to be clogged with dust by maintenance and inspection, the ventilation box will be removed and the net will be replaced. However, in the reticular formation work, the toilet is first stopped, the skirting board is removed, and then the ventilation box is separated from the end of the branch pipe to replace the reticular formation of the ventilation box. .. After the replacement, the ventilation box with the new reticular formation is connected to the branch pipe, the skirting board is attached to the original place, and the replacement work is completed. For this reason, there is a problem that the replacement work is troublesome and the toilet cannot be used during the work.

On the other hand, an opening is formed on the wall material side, and an outer frame is attached to the box-shaped connection duct that communicates with the ventilation duct, and an inner frame with a replaceable dustproof filter is attached to the ventilation duct so that it can be freely taken in and out from the front side. A unit (ventilation box) is known (see Patent Document 2). There, the left and right sides of the inner frame are provided with lock members that are elastically urged to the outside by torsion springs, and the left and right sides of the outer frame have holes for receiving the lock members when the inner frame is attached. It will be drilled. When mounting or separating the inner frame from the outer frame, the locking member of the inner frame has its protruding end between the outer opening and the hole of the outer frame, from the outer frame opening toward the hole, or. From the hole to the opening of the outer frame, the left and right sides of the outer frame are slid under the urging force of the torsion spring.

Utility Model Registration No. 2525300 Gazette Japanese Unexamined Patent Publication No. 2015-21688

In the structure of the ventilation unit, the protruding end slides with the outer frame from the middle stage of fitting the inner frame to the outer frame, which hinders smooth mounting of the inner frame. Further, when the inner side is attached to and detached from the outer frame, the inner surface of the outer frame receives a force from the protruding end of the lock member, and depending on the material, rubbing sliding marks remain in a band shape and the decorative surface is damaged.

The present invention has been made to solve the above problems, and provides a ventilation unit and a ventilation system capable of smoothly attaching and detaching an inner frame with a simple configuration and suppressing the occurrence of scratches on the decorative surface of the outer frame. The purpose is to do.

The ventilation unit according to one aspect of the present invention is a ventilation unit that forms a connection opening facing the opening provided on the inner wall surface and can be attached to a connection duct that communicates with the ventilation duct, and is fitted into the connection duct. It is equipped with an outer frame that can be mounted, an inner frame that is freely attached to the outer frame from the front side and a dustproof filter is replaceably attached, and a lock mechanism that locks the inner frame to the outer frame. For example, the connection duct has a box shape, and a square cylindrical outer frame and an inner frame can be configured according to the internal space size (cross-sectional shape) of the connection duct.

In the present invention, the lock mechanism is provided on the outer frame fitted to the connection duct, and the inner frame is provided with a lock member in which a protruding piece having a curved outer surface formed inside thereof is elastically urged to appear and disappear. It is provided with a receiving portion for receiving a protruding piece of the lock member.

When the inner frame is taken in and out of the outer frame and the receiving portion of the inner frame reaches the lock member of the outer frame, the lock member is received and locked. The lock member provided inside the outer frame does not come out from the inner surface of the outer frame by the rear end of the connection duct of the inner frame (for example, a dustproof filter attachment / detachment portion is provided) when the inner frame is fitted to the outer frame. It becomes possible to install it smoothly to the stop position as it is. In addition, it prevents sliding marks from being attached to the outer frame regardless of the material, and the outer frame retains the aesthetic appearance of the inner surface.

For example, the receiving part can be composed of holes. It is also possible to make the outer surface of the inner frame a recess.

When the inner frame is fitted and accommodated in the outer frame, the outer frame may be provided with a stopper that regulates the retreat of the inner frame when the inner frame is fitted and accommodated in the outer frame. The frame can be reliably held at a predetermined position in the inner and outer directions with respect to the outer frame.

It is also possible to provide a flange portion at the outer end portion in the inner / outer direction of the outer frame, and the mounting position of the stopper in the inner / outer direction can be set to a position where the inner frame protrudes outward from the flange portion of the outer frame. ..

The ventilation system according to one aspect of the present invention includes the above-mentioned ventilation unit, and also has a ventilation duct and a connection duct to which the ventilation unit can be attached, which forms an opening toward the indoor space and communicates with the ventilation duct. And. The connection duct is provided with an accommodating portion capable of accommodating at least a part of the lock member protruding from the outer surface of the outer frame. For example, the accommodating portion is composed of holes.

Considering cleaning inside the connecting duct, it is possible to provide an inclined portion between the inner side wall facing the opening and the bottom portion of the connecting duct. Further, in order to increase the wind speed of the air passing through the ventilation duct, it is possible to make the opening tube portion connected to the ventilation duct of the connecting duct an elliptical cross-sectional shape.

According to the ventilation unit and the ventilation system according to the present invention, the inner frame can be smoothly attached and detached with a simple configuration, and the occurrence of scratches on the decorative surface of the outer frame can be suppressed.

It is explanatory drawing which shows the toilet which installed the ventilation structure which concerns on one Embodiment of this invention. It is explanatory drawing which shows the arrangement of the ventilation duct, the outer frame, the inner frame, and the toilet bowl of the ventilation structure of FIG. FIG. 1 is a front view showing a state in which an inner frame is attached to an outer frame of the ventilation structure of FIG. 1, a vertical cross-sectional view of the state, a cross-sectional view of a main part, and an explanatory view showing a connection between a branch pipe and a connection duct. It is a perspective view which shows the state which the outer frame and the inner frame of the ventilation structure of FIG. 1 are separated. It is explanatory drawing which shows the lock member exposed on the outer surface of the outer frame of the lock mechanism, and is the sectional view of the main part. An explanatory view showing the lower side wall panel in which the opening is formed, an explanatory view showing a state in which the outer frame is inserted from the opening of the lower side wall panel and the flange portion is attached to the lower side wall panel, and an inner frame equipped with a dustproof filter. It is explanatory drawing which shows the state which was fitted in the outer frame. It is a perspective view which shows the ventilation structure which concerns on the modification of the said Embodiment.

The ventilation structure (ventilation system) of the present embodiment is a ventilation structure that connects an opening formed in a wall material provided on a wall surface of a room and a ventilation duct to suck and ventilate the air in the room. A structure is provided between the opening of the wall material and the ventilation duct side opening that is drawn and arranged in the vicinity of the opening, and the outer frame that communicates both of these openings and the outer frame from the front side. It is configured to have an inner frame that is freely attached and detached and a dustproof filter is replaceably attached, and a lock mechanism that locks the inner frame to the outer frame, and this lock mechanism is provided on the outer frame. This was realized by providing a lock member whose outer surface is formed on a curved surface and elastically urged to appear and disappear, and a receiving portion provided on the inner frame to receive the protruding pieces of the lock member.

Hereinafter, the present invention will be described with reference to the examples shown in the drawings. As shown in FIGS. 1 and 2, the ventilation structure (ventilation system) 2 according to the embodiment of the present invention is installed in a room 3 such as a toilet used by an unspecified number of people. Upper side wall panels (wall materials) 5 are juxtaposed on the wall surface of the room 3 at a predetermined height from the floor 4. A lower side wall panel (wall material) 7 is juxtaposed between the floor 4 and the upper side wall panel 5 to secure a storage space S for equipment inside. The lower side wall panel 7 is composed of a lower side wall panel 7A having a short width and a ventilation opening 8 formed at the bottom, and a lower side wall panel 7B having a long width and a toilet bowl 9 attached to the front side. The lower side wall panel portion 10 is formed by arranging the panels 7A and 7B alternately. The equipment storage space S (see FIG. 2) formed between the lower side wall panel portion 10 and the wall surface provided with the upper side wall panel 5 is provided with a top plate 11 that closes the upper opening thereof.

As shown in FIG. 2, the ventilation duct 12 is drawn into the space S defined between the lower side wall panel portion 10 and the wall surface. The intake / discharge end of the ventilation duct 12 communicates with the outside air through a ventilation fan (not shown). Branch pipes 13 (13A, 13B, 13C) are connected to the ventilation duct 12 at predetermined intervals according to the arrangement of the toilet bowl 9, and these branch pipes 13 are drawn into the vicinity of the ventilation opening 8 and are branched pipes. The other end opening 14 of 13 faces the opening 8 of the lower side wall panel 7A at a predetermined distance (see (B) in FIG. 3). The upper opening tube portion 15B of the connection duct 15 is connected to the lower end opening 14 of the branch pipe 13. The opening cylinder portion 15B has an elliptical cross section to increase the wind speed. The connection duct 15 is arranged so as to face the opening 8 so that the connection opening 15A is formed on the surface facing the opening 8 and one end of the outer frame 20 described later is fitted. There is.

In the ventilation structure 2 according to the present embodiment, the box-type ventilation unit 100 can be detachably attached to the connection duct 15 fitted in the opening 8 formed in the wall surface toward the space of the room 3. The outer frame 20 connects and communicates with the opening 8 of the lower side wall panel 7A and the connection opening 15A of the connection duct 15. As shown in FIG. 4, the outer frame 20 is formed in a square cylinder shape so that the outer periphery thereof matches the square opening 8 of the lower side wall panel 7A. The outer frame 20 has an outer frame main body 21 that connects and communicates between the opening 8 of the lower side wall panel 7A and the connection opening 15A of the connection duct 15, and the front end edge (inner / outer direction outer side) of the outer frame main body 21. It is configured to include a flange portion 23 formed on the edge) and a stopper 24 formed so as to project from the inner surface at a predetermined distance in the depth direction from the front edge of the outer frame main body 21. When the outer frame main body 21 is inserted from the opening 8 of the lower side wall panel 7A and connected to the connection duct 15, the flange portion 23 faces the opening peripheral edge 8A of the lower side wall panel 7A and comes into contact with the flange portion 23. There is. A mounting hole is formed in the corner of the flange portion 23. In the outer frame 20, the inner opening end 20A in the inner / outer direction is fitted from the opening 8 of the lower side wall panel 7A into the connection opening 15A of the connection duct 15, and the flange portion 23 hits the opening peripheral edge 8A of the lower side wall panel 7A. When the mounting screw 22 is brought into contact with the mounting screw 22 and screwed into the mounting hole of the flange portion 23, the mounting screw 22 can be mounted on the lower side wall panel 7A (see (C) in FIG. 3). In this way, the chamber 3 and the ventilation duct 12 are communicated with each other by the outer frame 20 via the connecting duct 15 and the branch pipe 13.

The inner frame 30 is freely attached to the outer frame 20 from the outer opening (front opening) 20B in the inner / outer direction. The inner frame 30 is formed in a square cylinder shape so as to be fitted on the inner surface of the outer frame main body 21 so as to substantially match the inner surface of the outer frame main body 21. Armor plates 31 are horizontally attached to the inner frame 30 on the outside (front side) at predetermined intervals. The armor plate 31 is provided with support plates 32 for supporting the armor plate 31 on both the left and right sides. A handle is formed by the armor plate 31 and the support plate 32. The armor plate 31 is used by the operator to grip the inner frame 30 by hand and to move the inner frame 30 in and out of the outer frame 20.

On the back side (inside in the inner / outer direction) of the inner frame 30, a detachable portion 34 for replaceably attaching the dustproof filter 33 is provided. The detachable portion 34 is formed by bending both inner and outer end portions of the inner frame 30 inward and bending the end edge of the bottom portion upward so that the dustproof filter 33 can be taken in and out from the upper opening. When the dustproof filter 33 is attached to the detachable portion 34 of the inner frame 30, the worker grasps the armor plate 31 by hand and pushes it into the outer frame 20. Then, when the inner end surface in the inner / outer direction, that is, the end surface of the detachable portion 34 comes into contact with the stopper 24 of the outer frame 20, the inner frame 30 is further displaced and mounted on the outer frame 20 at the restricted position. It has become like. At this time, the outer end faces of the inner frame 30 in the inner and outer directions are positioned on substantially the same plane as the flange portion 23. In this way, since the protruding portion is eliminated, safety can be ensured even if a part of the user's body touches it. In addition, by making the same surface, the user can be impressed with the aesthetic appearance of the design. The inner frame 30 may be stocked with spares in case of theft or damage.

The dustproof filter 33 is composed of a single plate of stainless steel punching metal having a large number of circular holes. The dust filter 33 is composed of a plurality of types having different diameters of circular holes, and is adapted to be appropriately selected and used by changing the opening ratio according to the ventilation plan of the facility. Since the dustproof filter 33 is made of a single metal plate, when the inner frame 30 is removed from the outer frame 20 and the dustproof filter 33 is pulled out from the inner frame 30, it is washed on site to remove moisture. The cleaning work is completed by reinserting the inner frame 30 on the spot and attaching the inner frame 30 to which the dustproof filter 33 is attached to the outer frame 20. If work cannot be performed on site, the dust filter 33 may be removed from the inner frame 30 and replaced with a new dust filter to clean the dirty dust filter 33 in another place, or the inner frame 30 may be cleaned. May be replaced with a new one. The dust filter 33 may be composed of a single plate having a grid pattern or a large number of slits formed therein. Further, the dust filter 33 may be made of a synthetic resin plate instead of the metal plate and may be made disposable. Further, the outer frame 20, the inner frame 30, and the dustproof filter 33 are rust-proof coated with colors matching the wall panels 5, 7A, and 7B.

The connection duct 15 is formed in a box shape, and an inclined portion 18 is provided between the inner side wall 16 facing the opening 15A and the bottom portion 17. Therefore, when the inner frame 30 is removed from the outer frame 20 to clean the inside of the outer frame 20 and the connection duct 15, the washing water easily flows to the outside. A waterproof adhesive tape such as adhesive aluminum tape is attached to the stepped portion between the inner edge of the outer frame 20 and the inner surface of the connection duct 15. Further, even if the inner frame 30 is removed from the outer frame 20, a decorative surface is formed on the inner surface of the outer frame 20 by plating or painting so that the appearance is maintained even if the inner surface is exposed.

By the way, a lock mechanism 40 is provided on the inner frame 30 and the outer frame 20. As shown in FIGS. 5A and 5B, the locking mechanism 40 is provided on the left and right side frames 21A and 21B of the outer frame 20, and the protruding pieces having a dogleg cross section inside the side frames 21A and 21B. The lock members 43 and 43 having a structure of a triangular door spring that urges the 43A and 43A to appear and disappear freely, and the left and right side frames 30A and 30B of the inner frame 30 and the protruding pieces 43A and 43A of the lock members 43 and 43, respectively. Correspondingly formed, when the inner frame 30 is fitted into the outer frame 20 and comes into contact with the stopper 24, the inner frame 30 is provided with holes (reception portions) 45 and 45 for receiving the protruding pieces 43A and 43A, respectively.

Each of the lock members 43, 43 is provided over the outer upper and lower sides of the openings 42, 42 that are opened in the left and right side frames 21A, 21B of the outer frame 20, respectively, and the support plate 35 having an opening formed inside, and the support thereof. The shaft support portions 41A and 41B formed above and below the opening of the plate 35, the shaft 41C pivotally supported between the shaft support portions 41A and 41B, and the left and right side frames 21A of the outer frame 20 from the openings 42 and 42. , A protruding piece 43A made of a bent metal piece having a cross-sectional shape that can freely appear and disappear inside the 21B and is accommodated so as to prevent it from falling off. It is configured to include a torsion spring (spring) 44 that elastically urges the projecting piece 43A inside the left and right side frames 21A and 21B.

Further, in the holes 45 and 45 drilled in the left and right side frames 30A and 30B of the inner frame 30, when the inner frame 30 reaches the stopper 24 of the outer frame 20, as described above, the protruding piece 43A of the lock member 43 Has come to accept. Therefore, in the lock mechanism 40, when the inner frame 30 is fitted into the outer frame 20 from the detachable portion 34 side and the outer surfaces of the left and right side frames 30A and 30B of the inner frame 30 hit the protruding pieces 43A and 43A, the left and right side frames 30A , 30B retracts the protruding pieces 43A, 43A inward from the openings 42, 42 against the urging force of the torsion springs 44, 44, and when the inner frame 30 abuts on the stopper 24, the protruding pieces 43A, 43A are torsioned. The springs 44 and 44 project to the holes 45 and 45 of the inner frame 30 by the elastic force of the springs 44 and 44, and the inner frame 30 is locked and held at that position. Then, when the inner frame 30 is pulled outward with a force that overcomes the elastic force of the torsion springs 44, 44, the protruding pieces 43A, 43A are separated from the holes 45, 45 and the lock is forcibly released, and the inner frame 30 is released. Is designed to be pulled out from the outer frame 20. The receiving portion for receiving the protruding piece 43A of the lock member 43 is formed by a hole 45 formed in the inner frame 30, but the present invention is not limited to this, and the recessed portion recessed inward in the inner frame 30 is provided. It may be formed and configured. Therefore, the protruding pieces 43A, 43A of the lock members 43, 43 slide only between the holes 45, 45 formed in the left and right side frames 30A, 30B from the back end edge of the inner frame 30, and slide on the outer frame 20. There are no marks.

A hole (accommodation portion) 19 is formed in the connection duct 15, and a part of the lock members 43, 43 provided on the outer frame 20 that protrudes outward from the side frames 21A, 21B of the outer frame 20, that is, a support. The plate 35, the shaft support portions 41A and 41B, the shaft 41C and the torsion spring 44 are accommodated. That is, when the inner frame 30 is fitted into the outer frame 20 and the projecting pieces 43A, 43A are fitted into the holes 45, 45 and locked, a part of the lock members 43, 43 is accommodated. There is. The connecting duct 15 is made of a thin metal plate and is deformable. Instead of the hole 19, a recessed portion may be formed on the outside of the connection duct 15 to accommodate a part of the lock members 43, 43.

Next, the operation of the ventilation structure 2 according to the above embodiment will be described. In the ventilation structure 2 according to the above embodiment, first, the connection duct 15 is installed in the branch pipe 13 of the ventilation duct 12, and the opening 8 is provided in the lower side wall panel 7A according to the arrangement of the connection duct 15. Next, the lower side wall panel 7A in which the opening 8 is formed is installed in a room 3 such as a toilet (see (A) in FIG. 6). Then, the outer frame 20 is inserted inside from the opening 8 of the lower side wall panel 7A, the inner opening end 20A in the inner / outer direction of the outer frame 20 is fitted into the connection opening 15A of the connection duct 15, and the flange portion 23 is inserted into the lower side wall. The flange portion 23 is attached to the lower side wall panel 7A by abutting the opening peripheral edge 8A of the panel 7A with the mounting screw 22. In this state, the branch pipe 13 and the chamber 3 are communicated with each other by the outer frame 20 (see (B) in FIG. 6). Next, a dustproof filter 33 is attached to the detachable portion 34 of the inner frame 30, and the inner frame 30 is pushed into the front opening 20B of the outer frame main body 21 by grasping the armor plate 31 by hand and abutting against the stopper 24. Let it be attached to the outer frame 20 at the regulated position. At this time, the protruding piece 43A of the lock member 43 of the lock mechanism 40 protrudes into the hole 45 of the inner frame 30 by the torsion spring 44 and is elastically held, so that the inner frame 30 is securely held with respect to the outer frame 20. .. At this time, a part 35, 41A, 41B, 41C, 44 of the lock member 43 is accommodated in the hole 19 of the connection duct 15. In this way, the air in the chamber 3 is guided to the ventilation duct 12 from the connection duct 15 and the branch pipe 13 via the dust filter 33 of the inner frame 30 and exhausted.

As described above, in the lock mechanism 40 of the ventilation structure according to the present embodiment, even if the inner frame 30 is repeatedly attached and detached, the outer frame 20 side does not have sliding marks of the lock members 43 and 43. Therefore, the decorative surface of the outer frame 20 retains its aesthetic appearance. Further, since the connection duct 15 connected to the bottom portion 21C of the outer frame 20 is provided with an inclined portion 18 between the inner side wall 16 and the bottom portion 17, when the inner frame 30 is removed and washed, washing water is supplied. It is easy to flow to the outside, and the cleaning work is streamlined.

FIG. 7 is a perspective view showing a ventilation structure according to a modified example of the above embodiment. In the ventilation structure 102 according to this modified example, the ventilation structure 2 according to the above embodiment has a mounting position of the stopper 24 in the inward and outward directions. By setting the outer surface of the inner frame 30, that is, the position where the front side surface and the flange portion of the outer frame form the same surface, and making the outer frame and the inner frame the same surface, the user is impressed with the aesthetic appearance of the design. On the other hand, the mounting position of the stopper in the inner and outer directions is set to a position where the front side surface 130C of the inner frame 130 projects outward from the flange portion 123 of the outer frame 120. When the front side surface of the inner frame is made to protrude outward, it is possible to give a strong impression to the user in terms of design and emphasize that consideration is given to the ventilation environment. Further, the front side surface of the inner frame may be set at a position where it retracts inward from the flange portion of the outer frame.

In the above embodiment, the dustproof filter 33 is provided on the back end edge of the inner frame 30, but the present invention is not limited to this, and the dust filter 33 is provided on the outer side of the inner frame 30 in the inner and outer directions, and the hole 45 of the inner frame 30 is provided. , 45 may be provided near the edge of the back side to shorten the sliding distance of the lock members 43, 43. Further, in the above embodiment, the lock member is composed of a bent metal piece having a doglegged cross section, but the present invention is not limited to this. It may be composed of members. Further, in the above embodiment, the flange portion 23 of the outer frame 20 is attached to the outside of the lower side wall panel (wall material) 7A, but the present invention is not limited to this, and the front side surface of the inner frame is the flange of the outer frame. When the surface is flush with the portion, or the flange portion 23 is projected outward or retracted inward, the flange portion 23 may be attached to the back side (inside) of the lower side wall panel 7A to make the design surface look smaller. Further, the inner frame 30 is provided with the attachment / detachment portion 34 of the dustproof filter 33, but the present invention is not limited to this. It may be fitted. Further, in the above embodiment, the ventilation structure is provided in a room such as a toilet, but the present invention is not limited to this, and it goes without saying that the ventilation structure may be provided in a facility where an unspecified number of people enter and exit.

2 Ventilation structure (ventilation system)
3 rooms 7 wall materials 8 openings 12 ventilation ducts 15 connection ducts 15A connection openings 15B opening cylinders 18 slopes 19 holes (accommodation)
20 Outer frame 30 Inner frame 33 Dustproof filter 40 Lock mechanism 43 Lock member 43A Projection piece 45 Hole (accepting part)
100 ventilation unit

Claims (7)

It is a ventilation unit that can be attached to a connection duct that forms a connection opening facing the opening provided on the wall surface of the room and communicates with the ventilation duct.
An outer frame that can be fitted to the connection duct and
The inner frame is attached to this outer frame so that it can be taken in and out from the front side, and the dust filter can be replaced.
Equipped with a lock mechanism that locks the inner frame to the outer frame
This lock mechanism is provided on the outer frame, and a lock member having a curved outer surface formed on the inside thereof is elastically urged to appear and disappear, and a lock member provided on the inner frame to receive the protruding pieces of the lock member. A ventilation unit characterized by being configured with a part. The ventilation unit according to claim 1, wherein the receiving portion is composed of holes. A flange is provided at the outer end of the outer frame in the inner and outer directions.
The outer frame is provided with a stopper that regulates the retreat of the inner frame when the inner frame is fitted and accommodated in the outer frame.
The ventilation unit according to claim 1 or 2, wherein the mounting position of the stopper in the inner / outer direction is set to a position where the inner frame protrudes outward from the flange portion of the outer frame. The ventilation unit according to any one of claims 1 to 3.
Ventilation duct and
A ventilation unit can be attached, a connection opening facing the opening provided on the wall surface of the interior space is formed, and a connection duct that communicates with the ventilation duct is provided.
A ventilation system characterized in that the connection duct is provided with an accommodating portion capable of accommodating at least a part of a lock member protruding from the outer surface of the outer frame. The ventilation system according to claim 4, wherein the accommodating portion is composed of holes. The ventilation system according to claim 4 or 5, wherein in the connection duct, an inclined portion is provided between the inner side wall facing the opening and the bottom portion. The ventilation system according to any one of claims 4 to 6, wherein the opening tube portion connected to the ventilation duct of the connection duct has an elliptical cross-sectional shape.

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