JPH07158957A - Reverse flow preventive damper - Google Patents

Abstract

PURPOSE:To prevent reverse flow of exhaust air of the other conduit to one conduit by providing a blade so mounted as to individually switch conduits of a multi-tube conduit to be brought into contact with a ringlike part in a closed state. CONSTITUTION:When exhaust air is sent from an exhaust source connected to conduits 12a, 12b of a two-conduit tube 14, blades 32a, 32b are opened by its wind pressure, and the air is discharged out of a room through a straight tube 48 as a confluent exhaust tube of a stretchable adapter 44. If the airs from exhaust sources are not discharged, the blades 32a, 32b are closed by pressing pressures of coiled springs 36a, 36b, and the conduits 12a, 12b are closed. Thus, reverse flow of the air exhausted through the one conduit to the other conduit can be effectively prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention damper, and more particularly to a backflow prevention damper used for preventing backflow of exhaust gas in each conduit of a multi-conduit tube.

[0002]

2. Description of the Related Art A conventional backflow preventing damper 1 of this type shown in FIG. 5 includes a substantially cylindrical frame body 2, to which blades 3a and 3b are connected. Then, such a backflow prevention damper 1 is attached to the straight pipe portion 7 of the expansion and contraction adapter 6 to which the two pipe passage pipe 5 is connected to the rubber ring receiving port 4. The blades 3a and 3b are normally closed by the pressing force of a spring (not shown), but are opened by the wind pressure when exhaust gas is passed through.

[0003]

In the conventional backflow prevention damper 1, since it is mounted on the straight pipe portion 7 of the expansion and contraction adapter 6, a space 8 is formed between the backflow prevention damper 1 and the two conduit pipe 5. The respective conduits of the two conduit pipes 5 were communicated with each other through this space 8. Therefore, there is a risk that a part of the exhaust gas discharged through one of the two conduits will flow backward through the other conduit. For example, if one conduit is in communication with the bath and the other conduit is in communication with the toilet, the humidity of the bath may flow into the toilet and the stench of the toilet may flow into the bath. .

Therefore, a main object of the present invention is to provide a backflow prevention damper capable of preventing exhaust gas of another pipe from backflowing into one pipe line.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a mounting portion mounted on a partition of a multi-conduit tube, a ring-shaped portion formed on the mounting portion and having an outer shape along the inner surface of each conduit of the multi-conduit tube. A blade that is attached to the attachment portion so as to be able to individually open and close each pipeline of the multi-pipe pipe, and contacts the ring-shaped portion in the closed state, and a ring shape that connects the attachment portion and the ring-shaped portion It is a backflow prevention damper provided with the reinforcement part which reinforces a part.

[0006]

Operation: The mounting portion is attached to the partition of the multi-pipe pipe, and the ring-shaped portion and the blade are arranged in each pipe passage. Each blade is
Normally, it is closed by the pressing force of the spring, and when exhaust gas is passed, it is opened in one direction by the wind pressure. Also,
Since the ring-shaped portion is reinforced by the reinforcing portion, there is no problem that the ring-shaped portion is deformed or damaged when the ring-shaped portion is inserted into the conduit or the like.

[0007]

According to the present invention, it is possible to reliably prevent the exhaust gas from the other pipeline from flowing back into the one pipeline. The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0008]

1 and 2, the backflow preventing damper 10 of this embodiment has one end of each of the conduits 12a and 12b connected to an individual exhaust source (not shown) (bath, toilet, etc.). It is attached to the other end of the two-pipe tube 14, and includes a main body 16 formed by injection molding of a synthetic resin such as polyethylene. The main body 16 includes a substantially U-shaped mounting portion 18, and rises vertically from an open end of the mounting portion 18 to form ring-shaped portions 20 a and 20 b having an outer shape along the inner surface of the two-pipe tube 14. Ring-shaped part 2
As can be seen from FIGS. 3 and 4, a plurality of protrusions 24 each having a substantially hemispherical head portion 22 are formed at predetermined positions on 0a and 20b, and the rubber packings 26a and 26b is attached. Then, the ring-shaped portions 20a and 20b and the mounting portion 18 are connected via the reinforcing portions 28a and 28b, respectively, and thereby the ring-shaped portions 20a and 20b are reinforced. Further, substantially cylindrical bearings 30a and 30b (not shown) are attached to the rising bases of the ring-shaped portions 20a and 20b.

The body 16 is connected with blades 32a and 32b, which are made of synthetic resin such as polyethylene and have a substantially semicircular disk shape, for opening and closing the conduits 12a and 12b of the two-pipe conduit 14. That is, the bearing 34a and the coil spring 36a formed on the blade 32a are connected to the main body 16
Are arranged in line with the bearings 30a attached to them, through which the shafts 38a are passed, whereby
The blade 32a and the main body 16 are connected. Further, the bearing 34b (not shown) formed on the blade 32b and the coil spring 36b (FIG. 1) are arranged in a straight line with respect to the bearing 30b (not shown) attached to the main body 16, and the shaft is attached to them. 38b is passed therethrough, thereby connecting the blade 32b and the main body 16. Therefore, a pressing force in the closing direction is applied to the blades 32a and 32b by the coil springs 36a and 36b. In addition,
Ring-shaped portion 20 that abuts on the blades 32a and 32b
A rubber plate may be attached to the abutting surfaces of a and 20b to improve airtightness, or a sealing material may be caulked.

Such a backflow preventing damper 10 is attached to the end portion of the two-pipe pipe 14 so that the partition 38 is sandwiched between the mounting portions 18. Then, as shown in FIG. 1, this end portion is inserted into the rubber ring receptacle 46 of the expansion and contraction adapter 44 fixed to the outer wall 40 with the mortar 42. When exhaust gas is delivered from an exhaust source (not shown) connected to the conduits 12a and 12b of the two conduit pipe 14, the blade 3 is blown by the wind pressure thereof.
2a and 32b are opened, and the exhaust is a telescopic adapter 44
Is discharged to the outside through the straight pipe portion 48 as the combined exhaust pipe portion. If the exhaust gas is not delivered from each exhaust source (not shown), the blades 32a and 32b are closed by the pressing force of the coil springs 36a and 36b, and the respective pipelines 12a and 12b are closed.

According to this embodiment, the exhaust gas discharged through one of the conduits 12a or 12b is transferred to the other conduit 12 of the other conduit.
It is possible to reliably prevent backflow of b or 12a. Further, the ring-shaped portion 20 is provided by the reinforcing portions 28a and 28b.
Since the a and 20b are reinforced, the ring-shaped portion 20a is used when the backflow prevention damper 10 is mounted on the two-pipe pipe 14, etc.
There is no problem that the 20 and 20b are deformed or damaged.

Further, the rubber packings 26a and 26b can ensure the airtightness of the outer peripheral portion of the backflow prevention damper 10. Furthermore, since the main body 16 and the blades 32a and 32b are made of synthetic resin, the noise when the blades are opened and closed when they are made of stainless steel or the like can be eliminated.

In this embodiment, the blades 32a and 32b corresponding to the respective pipelines 12a and 12b are connected to each other by the mounting portion 18, but they are independently formed to form the respective pipelines 12a and 12b. You may make it attach individually. In addition to the two-pipe pipe, the present invention can be applied to other multi-pipe pipes such as a three-pipe pipe and a four-pipe pipe.

[Brief description of drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention.

2 is an exploded perspective view of the embodiment of FIG. 1. FIG.

FIG. 3 is an illustrative view showing a state where a rubber packing is attached to a ring-shaped portion.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

FIG. 5 is an illustrative view showing a conventional technique.

[Explanation of symbols]

 10 ... Backflow prevention damper 12a, 12b ... Pipe line 18 ... Attachment part 20a, 20b ... Ring-shaped part 26a, 26b ... Rubber packing 28a, 28b ... Reinforcement part 30a, 30b, 34a, 34b ... Bearing 36a, 36b ... Coil spring 38 ... Partitions 38a, 38b ... Shaft 44 ... Telescopic adapter

Claims (1)

[Claims] 1. A mounting portion mounted on a partition of a multi-pipe pipe, a ring-shaped portion formed on the mounting portion and having an outer shape along the inner surface of each pipe of the multi-pipe pipe, A blade that is attached to the attachment portion so as to be able to individually open and close each of the pipelines, and that abuts the ring-shaped portion in the closed state, and the ring-shaped portion that connects the attachment portion and the ring-shaped portion. A backflow prevention damper having a reinforcing portion for reinforcing the portion.