JP2002349943A - Rubber bush, ventilation adapter, and sealing structure for ventilation pipe for ventilation hole using both - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber bush, a ventilation adapter, and a sealing structure for a ventilating pipe for a ventilating hole using the former members, where on the ventilation pipe being inserted and fixed into the ventilation hole sealing applied at opposite ends of the ventilation pipe is less likely to be destroyed. SOLUTION: A rubber bush 10 is adapted such that a protrusion 13 protruded from an outer surface of a flange section 12 makes contact with the back of a bathroom heating drier 1 mounted on the wall surface of an outer wall W, in a state where a body section 11 mounted at an end of a ventilation pipe EP on the side of the bathroom is fitted to a ventilation hole EH from the side of the bathroom, such that a flange section 12 being brought into close contact with the wall surface of the outer wall W through a sealing member. A ventilation adapter 20 is adapted, such that a substrate 21 is fixed with a screw to the wall surface of the outer wall W, in a state where after a fitting groove 23 is filled with the sealing member and the sealing member is applied on a sealing member application region 24, and end of the ventilation pipe EP is fitted to the fitting groove 23, such that a pipe connection port 22 is inserted into the end of the ventilation pipe EP outside a house.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber bush and a ventilation adapter for fixing a ventilation pipe for a bathroom heater inserted into a ventilation hole penetrating an outer wall forming a bathroom on a bathroom side and an outdoor side, respectively. Further, the present invention relates to a structure for sealing a ventilation pipe to a ventilation hole using such a rubber bush or a ventilation adapter.

[0002]

2. Description of the Related Art A high-humidity air in a bathroom is supplied to a bathroom heater / dryer that heats the bathroom by blowing hot air into the bathroom using the heat of hot water supplied from a hot water heating heat source unit. There are those equipped with a ventilation fan for exhausting outdoors, and such a bathroom heating and drying machine is usually installed on the bathroom side wall of the outer wall forming the bathroom,
Air in the bathroom is exhausted to the outside through a ventilation hole formed in the mounting area.

By the way, when air in a bathroom is exhausted outside through a ventilation hole formed in an outer wall, a ventilation pipe is provided in the ventilation hole so that humid air in the bathroom does not enter the outer wall through the ventilation hole. The ventilation pipe inserted into the ventilation hole is fixed at one end side (the end on the bathroom side) to the ventilation hole by a rubber bush, and is ventilated using the rubber bush. A gap formed between the hole and the ventilation pipe is sealed.

[0006] The rubber bush is shown in FIGS.
As shown in FIG. 5, a tubular main body 51 attached to one end (end on the bathroom side) of a ventilation pipe inserted into a ventilation hole, and a flange 5 projecting outward from one end of the main body 51.
The ventilation pipe having the rubber bush 50 is inserted into the ventilation hole from the bathroom side and the main body 51 of the rubber bush 50 is fitted into the ventilation hole.
One end of the ventilation pipe inserted into the ventilation hole is fixed to the ventilation hole via a rubber bush 50.

When the rubber bush 50 is fitted into the ventilation hole, a sealing material is applied to the inner surface of the flange 52 in advance, and the inner surface of the flange 52 is brought into close contact with the wall surface of the outer wall. By sealing the flange portion 52 to the wall surface of the bathroom through the hole, high-humidity air does not enter between the ventilation hole and the ventilation pipe from the bathroom side.

On the other hand, the other end (outside end) of the ventilation pipe inserted into the ventilation hole is fixed by a ventilation adapter attached to the outside wall of the outer wall forming the bathroom. It is discharged from the outdoor end through the ventilation pipe by sealing the outdoor end of the ventilation hole with the sealing material filled between the ventilation hole and the ventilation pipe from the outdoor side Humid air in the bathroom is prevented from entering between the ventilation hole and the ventilation pipe.

[0007] As shown in FIG.
A substrate 61 fixed to the wall surface of the outer wall, and a cylindrical connection port 62 protruding from the inner surface side of the substrate 61 are provided. When the connection port 62 is inserted into the end of the ventilation pipe,
By fixing 1 to the outer wall surface, the outdoor end of the ventilation pipe is held in a predetermined state.

In order to insert and fix a ventilation pipe into a ventilation hole formed on an outer wall using the rubber bush 50 and the ventilation adapter 60 as described above, first, as shown in FIG. One end of the ventilation pipe EP is inserted into the main body 51 and an aluminum tape AT is wound around the body to fix them, and then a seal material SM is applied to the inner surface of the flange 52. The ventilation pipe EP on which the rubber bush 50 is mounted in this manner is inserted into the ventilation hole EH from the bathroom side as shown in FIG. 4B, and the flange portion 52 of the rubber bush 50 is in close contact with the wall surface of the bathroom. As described above, by fitting the rubber bush 50 into the ventilation hole EH, one end of the ventilation pipe EP is fixed to the ventilation hole EH,
After sealing the flange portion 52 and the wall surface of the bathroom with the sealing material SM, the bathroom heater / dryer 70 is attached to the wall surface of the bathroom.

Subsequently, as shown in FIG. 9A, a sealing material SM is provided between the ventilation hole EH and the ventilation pipe EP from the outdoor side.
After filling, the board 61 of the ventilation adapter 60 is fixed to the outer wall surface with the connection port 62 of the ventilation adapter 60 inserted into the outdoor end of the ventilation pipe EP as shown in FIG. Then, the ventilation pipe EP is inserted and fixed in the ventilation hole EH in a state where the ventilation hole EH and the ventilation pipe EP are sealed on the bathroom side and the outdoor side.

[0010]

By the way, when the bathroom heater / dryer 70 equipped with the ventilation fan is mounted on the wall of the bathroom, as shown in FIG. As shown in FIG. 9 (b), the ventilation adapter 60 is attached to the outdoor end of the ventilation pipe EP as shown in FIG.
When the ventilation adapter 60 is fixed to the wall surface of the outer wall so as to insert the connection port 62, even if the ventilation pipe EP is pushed toward the bathroom, the ventilation pipe EP does not move toward the bathroom, and the flange 51 The seal applied to the wall is not destroyed.

However, in a bathroom heater / dryer of a type in which a ventilation fan unit is separately installed outdoors, FIG.
As shown in (a), a certain gap S is formed between the back surface of the bathroom heater / dryer 80 and the wall surface of the bathroom.
Generally, the bathroom heater / dryer 80 is mounted on the wall surface of the bathroom so that the air in the bathroom can be sucked through the gap S. Therefore, a rubber bush that fixes the end of the ventilation pipe EP on the bathroom side is fixed. A gap is formed between the flange portion 52 of 50 and the back surface of the bathroom heater / dryer 80.

Therefore, when the ventilation pipe 60 is pushed to the bathroom side with a strong force when the ventilation adapter 60 is attached to the outer wall surface, the ventilation pipe EP moves to the bathroom side as shown in FIG. In such a case, the flange portion 52 of the rubber bush 50 that is in close contact with the wall surface of the bathroom via the sealing material SM is separated from the wall surface and is provided between the wall surface of the bathroom and the flange portion 52. There is a problem that the existing seal is broken.

Further, when the gap between the ventilation hole EH and the ventilation pipe EP becomes large, when the connection port 62 of the ventilation adapter 60 is inserted into the outdoor end of the ventilation pipe EP for connection, or when the ventilation pipe EP is When fixing the connected ventilation adapter 60 to the outer wall surface, the outdoor end of the ventilation pipe EP moves easily in the radial direction of the ventilation hole EH, and the ventilation pipe E
By filling the sealing material between P and the ventilation hole EH, the seal provided between the ventilation hole EH and the ventilation pipe EP may be broken.

Accordingly, an object of the present invention is to provide a rubber bush and a ventilation adapter which are hard to break seals provided at both ends of the ventilation pipe when the ventilation pipe is inserted into and fixed to the ventilation hole. It is an object of the present invention to provide a structure for sealing a ventilation pipe with respect to a ventilation hole which has been used.

[0015]

Means for Solving the Problems and Their Effects To solve the above-mentioned problems, the invention according to claim 1 is provided with a ventilation for a bathroom heater inserted into a ventilation hole penetrating an outer wall forming a bathroom. A pipe is a rubber bush that is fixed on the bathroom side, and a cylindrical main body fitted into the ventilation hole from the bathroom side in a state of being attached to one end of the ventilation pipe, and from one end of the main body. A flange protruding outward, and a protrusion protruding from an outer surface of the flange, wherein the protrusion is configured to ventilate the main body from the bathroom side such that the flange is in close contact with a wall surface of the outer wall. The rubber bush is provided so as to be in contact with a back surface of the bathroom heater attached to a wall surface of the outer wall while being fitted in the hole.

As described above, in this rubber bush, the protrusion protruding from the outer surface of the flange portion is provided in a state where the main body is fitted into the ventilation hole from the bathroom side so that the flange portion is in close contact with the wall surface of the outer wall. , Because it comes into contact with the back of the bathroom heater attached to the wall of the outer wall, like a bathroom heater of the type where the ventilation fan unit is installed outdoors, in a state where it is attached to the bathroom wall, Even if a certain gap must be formed between the back of the bathroom heater and the bathroom wall, the rubber bush may move toward the bathroom between the back of the bathroom heater and the bathroom wall. Therefore, the flange portion is securely held in a state in which the flange portion is in close contact with the wall surface of the bathroom.

Therefore, a sealing structure for the ventilation hole of the ventilation pipe inserted and fixed through the rubber bush into the ventilation hole penetrating the outer wall forming the bathroom, wherein one end of the ventilation pipe is connected to the ventilation hole In a state of being mounted on the main body, the main body is fitted into the ventilation hole from the bathroom side such that the inner surface of the flange portion is in close contact with the bathroom-side wall surface of the outer wall via a sealing material, The adoption of the seal structure according to claim 2, wherein the convex portion protruding from the outer surface of the flange portion is in contact with a back surface of a bathroom heater attached to a bathroom-side wall surface of the outer wall. When installing, even if the ventilation pipe is pushed to the bathroom side, the ventilation pipe does not move to the bathroom side, so there is no breakage of the seal between the flange part and the wall surface An initial sealed condition was performed in the bathroom side can be securely held.

According to another aspect of the present invention, a ventilation pipe for a bathroom heater inserted into a ventilation hole penetrating an outer wall forming a bathroom is provided on the outer wall. A ventilation adapter to be fixed on the outside, comprising: a substrate having a cylindrical connection port fixedly installed on an outdoor wall surface of the outer wall, wherein the inside of the substrate has the ventilation port outside the connection port. An object of the present invention is to provide a ventilation adapter in which an annular fitting groove into which an end of a pipe fits and an annular sealing material application region are formed so as to surround the outside of the fitting groove.

As described above, this ventilation adapter ventilates the inside of the substrate having the cylindrical connection port, which is fixedly installed on the outdoor wall of the outer wall forming the bathroom, and the outside of the connection port. Since the annular fitting groove into which the end of the pipe fits and the annular sealing material application area surrounding the outside of the fitting groove are formed, the fitting groove is filled with the sealing material and the sealing material is filled. With the sealing material applied to the application area, insert the end of the ventilation pipe into the fitting groove and fix the board to the wall of the outer wall.The outdoor end of the ventilation pipe inserted into the ventilation hole is the ventilation adapter And the sealing material filled in the fitting groove is used to seal the fitting groove and the end of the ventilation pipe fitted in the fitting groove, and to the sealing material application area. By the applied sealing material, the substrate and And the wall surface of Kigaiheki is sealed, a seal structure according to claim 5 is realized.

In the seal structure configured as described above,
Although the gap between the ventilation hole and the ventilation pipe is not directly sealed, the ventilation pipe and the ventilation adapter are mutually sealed by the fitting groove part formed outside the connection port, and the fitting groove The interior surface of the ventilation adapter substrate and the wall surface of the outer wall are sealed in the annular sealing material application area formed so as to surround the humid air. However, the humid air in the bathroom, which was once exhausted outside, did not enter between the ventilation hole and the ventilation pipe through the connection port of the ventilation adapter, and the ventilation hole And between the ventilation pipes.

In addition, this seal structure fills a gap between the ventilation hole and the ventilation pipe by filling the space between the ventilation pipe and the ventilation hole with a sealing material as in the conventional seal structure. When the ventilation adapter is connected to the outdoor end of the ventilation pipe, or when the ventilation adapter connected to the ventilation pipe is fixed to the wall of the outer wall, it is not directly sealed. Even if the end moves in the radial direction in the ventilation hole, seal breakage (poor sealing) does not occur, and the outdoor end of the ventilation hole can be reliably sealed.

In the case of a bathroom heater equipped with a ventilation fan, the ventilation adapter constructed as described above is fixed independently to the wall surface of the outer wall. However, a bathroom in which the ventilation fan unit is installed outdoors In the case of a heater, the ventilation adapter is provided as in the ventilation fan unit according to claim 4, comprising the ventilation adapter, a casing attached to the ventilation adapter, and a ventilation fan housed in the casing. The same effect can be achieved by fixing the device to the wall surface of the outer wall in a state where it is incorporated in the ventilation fan unit.

[0023]

Embodiments will be described below with reference to the drawings. FIG. 1 shows a bathroom heating / drying device 1 of a type in which a ventilation fan unit 2 for exhausting humid air in a bathroom to the outside is installed on a wall surface of an outer wall W forming a bathroom. The state is shown.

The bathroom heater / dryer 1 is fixed to the bathroom side wall of the outer wall W such that a gap of about several mm is formed between the back surface and the outer wall W as shown in FIG. Is fixed in the bathroom through the mounting plate 3 provided, and the outside wall W receives air in the bathroom sucked from a gap formed between the back surface of the bathroom heating / drying machine 1 and the wall surface of the outside wall W. A ventilation hole EH for exhausting air outdoors is formed so as to penetrate the installation area of the bathroom heating / drying machine 1.

A ventilation pipe EP is inserted into the ventilation hole EH to prevent the humid air in the bathroom from entering the outer wall W from the ventilation hole EH when the air in the bathroom is exhausted outside. The end of the ventilation pipe EP on the bathroom side is fixed by a rubber bush 10, and the end on the outdoor side is fixed by a ventilation adapter 20 which is a component of the ventilation fan unit 2.

The rubber bush 10 is shown in FIGS.
As shown in (c), a cylindrical main body 11 fitted into one end (end on the bathroom side) of the ventilation pipe EP inserted into the ventilation hole EH, and stretched outward from one end of the main body 11. A flange portion 12 to be protruded, and four projections 13 protruding outward from an outer surface of the flange portion 12.
When the ventilation pipe EP fitted with one end of the rubber bush 10 is inserted into the ventilation hole EH from the bathroom side and the main body 11 of the rubber bush 10 is fitted into the ventilation hole EH, as shown in FIG. One end of the ventilation pipe EP inserted into the hole EH is fixed to the ventilation hole EH via the rubber bush 10. The rubber bush 10 fitted to one end of the ventilation pipe EP is fixed to the ventilation pipe EP by winding aluminum tape so as to cover both the outer peripheral surface of the main body 11 and the outer peripheral surface of the ventilation pipe EP. I have.

When the rubber bush 10 is fitted into the ventilation hole EH, a sealing material is applied to the entire inner surface of the flange portion 12 in advance and the inner surface of the flange portion 12 is brought into close contact with the wall surface of the outer wall. Thus, by sealing the flange portion 12 to the wall surface of the bathroom via a sealing material, air with high humidity does not enter between the ventilation hole EH and the ventilation pipe EP from the bathroom side.

After one end of the ventilation pipe EP inserted into the ventilation hole EH is fixed by the rubber bush 10 in this manner, the bathroom heater / dryer 1 is connected to the outer wall W through the mounting plate 3.
In the state where the bathroom heater / dryer 1 is installed and fixed on the wall surface of the outer wall W, as shown in FIG. 1, it protrudes from the flange portion 12 of the rubber bush 10. The projection 13 comes into contact with the back of the bathroom heater / dryer 1. In addition, since the back surface of the bathroom heating / drying device 1 is formed in an uneven shape, a part of the projection 13 is bent so that the tip thereof is along the back surface of the bathroom heating / drying device 1, and is bent. Due to the elastic force of the projection 13, the flange portion 12 of the rubber bush 10
To be pressed against the wall.

As shown in FIGS. 1 and 4 (a) to 4 (d), the ventilation fan unit 2 has a ventilation adapter 20 fixed to an outer wall surface of the outer wall W, and screws attached to the ventilation adapter 20. And a ventilation fan 40 attached to the ventilation adapter 20 in the casing 30.
At 0, an exhaust port 31 covered with a mesh is formed at a position corresponding to the discharge port 41 of the ventilation fan 40, and a connection tube for hot water circulation guided from the bathroom heater / dryer 1 through the ventilation pipe EP. In order to pull out the HC (see FIG. 1) and the electric wires outside, knockout portions 32a, 32b, and 32c are formed on both side surfaces and a bottom surface, and are formed to have thin walls around the periphery.

The ventilation adapter 20 is shown in FIG.
As shown in (b), a substrate 21 having a screw hole 21a formed therein for screwing the screw to the outdoor wall surface of the outer wall W, and an end of a ventilation pipe EP protruding inward at a central portion of the substrate 21. A cylindrical pipe connection port 22 inserted into the portion,
An annular fitting groove 23 formed around the pipe connection port 22 and into which the end of the ventilation pipe EP fits, and an annular sealing material having a predetermined width slightly depressed so as to surround the fitting groove 23. A cylindrical fan connection port 2 protruding to the outer surface side of the substrate 21 so as to surround the coating area 24 and the pipe connection port 22
The fan connection port 25 is connected to a suction port of a ventilation fan 40.

The ventilation adapter 20 configured as described above
As shown in FIG. 1 and FIG. 2, after filling the sealing material SM into the fitting groove 23 and applying the sealing material SM to the sealing material application region 24, the ventilation pipe EP inserted into the ventilation hole EH is When the board 21 is screwed to the wall surface of the outer wall W in a state where the end of the ventilation pipe EP is fitted into the fitting groove 23 so that the pipe connection port 22 is inserted into the end on the outdoor side,
The outdoor end of the ventilation pipe EP is fixed by the ventilation adapter 20, and the fitting groove 23 and the end of the ventilation pipe EP are sealed by the sealing material SM filled in the fitting groove 23, and the sealing material is applied. The substrate 21 and the wall surface of the outer wall W are sealed by the seal material SM applied to the region 24.

Accordingly, the humid air in the bathroom discharged outside through the ventilation pipe EP is supplied to the ventilation adapter 20.
Ventilation hole EH and ventilation pipe E from the pipe connection port 22
The air having high humidity in the bathroom, which has been exhausted to the outside by the ventilation fan 40 once without entering between the ventilation hole E and the ventilation pipe E, is formed between the substrate 21 and the wall surface of the outer wall W. There is no intrusion.

As described above, the rubber bush 10 described above is used.
Is such that the flange portion 12 is in close contact with the wall surface of the outer wall W,
In a state where the main body 11 is fitted into the ventilation hole EH from the bathroom side,
The protrusion 13 protruding from the outer surface of the flange portion 12
Is brought into contact with the back surface of the bathroom heating / drying device 1 attached to the wall surface of the outer wall W. Even when a gap for sucking air is formed, the rubber bush 10 fitted in the ventilation hole EH moves toward the bathroom between the back surface of the bathroom heater / dryer 1 and the wall surface of the outer wall W. And the flange portion 12 is securely held in a state in which the flange portion 12 is in close contact with the wall surface of the outer wall W.

Therefore, on the outdoor side, the ventilation adapter 20
When the ventilation pipe EP is pushed toward the bathroom side when attaching the pipe, the ventilation pipe EP does not move toward the bathroom side, so that a seal break occurs between the flange portion 12 of the rubber bush 10 and the wall surface of the outer wall W. Therefore, the initial sealing state applied on the bathroom side can be reliably maintained.

In the sealing structure using the ventilation adapter 20 described above, the ventilation hole E is provided as in the conventional sealing structure.
The gap between the ventilation hole EH and the ventilation pipe EP is not directly sealed by filling the sealing material between the ventilation pipe EP and the ventilation hole EH inserted in the H. Ventilation adapter 20 at outer end
When connecting to the wall or fixing the ventilation adapter 20 to which the ventilation pipe EP is connected to the wall of the outer wall W, the ventilation pipe EP
Even if the outdoor end of the air hole moves in the radial direction in the ventilation hole EH, seal breakage (seal failure) does not occur, and the outdoor end of the ventilation hole EH can be reliably sealed. it can.

In the above-described embodiment, the description has been given of the bathroom heater / dryer 1 of a type in which the ventilation fan unit 2 incorporating the ventilation adapter 20 is separately installed outdoors. However, the ventilation adapter of the present invention and the use thereof are described. The sealing structure was not limited to this type of bathroom heater / dryer, but could also be applied to bathroom heater / dryers equipped with a ventilation fan. What is necessary is just to fix to the wall surface of.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a ventilation pipe inserted through a ventilation hole penetrating an outer wall forming a bathroom is fixed using a rubber bush and a ventilation adapter according to the present invention.

FIG. 2 is an enlarged view showing a portion surrounded by a two-dot chain line in FIG.

FIG. 3A is a sectional view showing a rubber bush of the above.
(B) is a side view which shows the same rubber bush, and (c) is a front view which shows the same rubber bush.

4A is a front view showing a ventilation fan unit in which the ventilation adapter is incorporated, FIG. 4B is a right side view showing the ventilation fan unit in the same, and FIG. FIG. 5D is a left side view, and FIG.

FIG. 5A is a plan view showing the inside of the ventilation adapter of the above, and FIG. 5B is a sectional view of the ventilation adapter of the same.

FIG. 6A is a sectional view showing a conventional rubber bush;
(B) is a side view which shows the same rubber bush, and (c) is a front view which shows the same rubber bush.

FIG. 7 is a sectional view showing a conventional ventilation adapter.

FIGS. 8A and 8B are process diagrams showing a method of inserting and fixing a ventilation pipe into a ventilation hole formed in an outer wall using a conventional rubber bush and a ventilation adapter.

9A and 9B are process diagrams showing a method of inserting and fixing a ventilation pipe into a ventilation hole formed on an outer wall using a conventional rubber bush and a ventilation adapter.

FIGS. 10A and 10B are explanatory diagrams for explaining a problem of a sealing structure of a ventilation pipe fixedly inserted into a ventilation hole using a conventional rubber bush and a ventilation adapter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bathroom heater / dryer (bathroom heater) 2 Ventilation fan unit 3 Mounting plate 10 Rubber bush 11 Main part 12 Flange part 13 Projection (convex part) 20 Ventilation adapter 21 Substrate 22 Pipe connection port (connection port) 23 Fitting groove 24 Seal material application area 30 Casing 31 Exhaust port 40 Ventilation fan 41 Discharge port EH Ventilation hole EP Ventilation pipe SM Seal material W Outer wall

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F24F 7/06 F24F 7/06 B 7/10 7/10 Z (72) Inventor Nobuyuki Higuchi Kobe, Hyogo Prefecture 93 Noritsu, Edo-cho, Chuo-ku, Japan (72) Inventor Tadashi Yamamoto 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture, Japan (72) Inventor Shunsuke Nihei 93, Edocho, Chuo-ku, Kobe, Hyogo, Japan F-term in Noritz Corporation (reference) 3L058 BD02 BE05 BG03 3L080 AA03 AA09 AB07 AC03 AD02 4L019 BA03

Claims (5)

[Claims] 1. A rubber bush for fixing a ventilation pipe for a bathroom heater inserted in a ventilation hole penetrating an outer wall forming a bathroom on a bathroom side, the ventilation bush being attached to one end of the ventilation pipe. A cylindrical main body fitted into the ventilation hole from the bathroom side in a state, a flange protruding outward from one end of the main body, and a convex protruding from an outer surface of the flange, The convex portion is attached to the ventilation hole from the bathroom side such that the flange portion is in close contact with the wall surface of the outer wall. A rubber bush characterized by being abutted. 2. A sealing structure for the ventilation hole of a ventilation pipe inserted and fixed via a rubber bush according to claim 1, into a ventilation hole penetrating an outer wall forming a bathroom, wherein the ventilation pipe is provided. With one end attached to the main body,
The main body is fitted into the ventilation hole from the bathroom side such that an inner surface of the flange portion is in close contact with a bathroom-side wall surface of the outer wall via a sealing material, and the body protrudes from an outer surface of the flange portion. A structure for sealing a ventilation pipe with respect to a ventilation hole, wherein the projection is in contact with a back surface of a bathroom heater attached to a bathroom-side wall surface of the outer wall. 3. A ventilation adapter for fixing a ventilation pipe for a bathroom heater, which is inserted into a ventilation hole penetrating an outer wall forming a bathroom, on the outdoor side of the outer wall, A substrate fixedly installed on a wall surface and having a cylindrical connection port; an annular fitting groove into which an end of the ventilation pipe fits outside the connection port on an inner surface side of the substrate; A ventilation adapter, wherein an annular seal material application region is formed so as to surround the outside of the groove. 4. A ventilation fan unit for a bathroom heater mounted on an outdoor wall of an outer wall forming a bathroom, wherein the ventilation adapter according to claim 3 and a casing attached to the ventilation adapter. And a ventilation fan unit housed in the casing. 5. A sealing structure for the ventilation hole of a ventilation pipe inserted and fixed in a ventilation hole penetrating an outer wall forming a bathroom using the ventilation adapter according to claim 3, wherein the ventilation adapter In a state where is fixedly installed on the outer wall, the fitting groove and the end of the ventilation pipe fitted into the fitting groove are sealed by a sealing material filled in the fitting groove, The sealing structure for a ventilation pipe with respect to a ventilation hole, wherein the substrate and the wall surface of the outer wall are sealed by a sealing material applied to the sealing material application region.