JPH0949657A - Backflow prevention damper - Google Patents

Abstract

(57) [Summary] When the backflow prevention damper 10 is attached to the two-pipe conduit 14 by the mounting portion 18, the ring-shaped portion 20a and the blade 32a are arranged in the one conduit 12a, and the other conduit 12 is arranged.
The ring-shaped portion 20b and the blade 32b are arranged at b. The ring-shaped portions 20a and 20b are provided with a drain cutout portion 22a for discharging condensed water due to moisture from an exhaust source.
And 22b are formed. Then, rubber rings 26a and 26b are attached to the outer circumferences in order to prevent the position from being displaced or the falling due to the wind pressure from the exhaust source. The blades 32a and 32b are in pressure contact with the ring-shaped portions 20a and 20b by the coil springs 36a and 36b, and are opened by the wind pressure when exhaust gas is passed through. [Effect] The blade can be opened and closed reliably.

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 pipe of a multi-pipe pipe used for ventilation pipes or building equipment.

[0002]

2. Description of the Related Art An example of a conventional backflow preventing damper 1 of this type is disclosed in Japanese Patent Application No. 5-303755. As shown in FIG. 4, the backflow prevention damper 1 includes a substantially U-shaped mounting portion 4 that is mounted on the partition 3 of the two-pipe pipe 2. The attachment portion 4 is formed with ring-shaped portions 5a and 5b each having an outer shape along the inner surface of each of the conduits 2a and 2b of the two conduit pipe 2,
Further, blades 6a and 6b which are brought into contact with the ring-shaped portions 5a and 5b in the closed state are attached so that the respective pipelines 2a and 2b of the two-pipe tube 2 can be individually opened and closed. The ring-shaped portions 5a and 5b are attached to the mounting portion 4
Is reinforced by the reinforcing portions 7a and 7b that connect the ring-shaped portions 5a and 5b.

Then, such a backflow preventing damper 1 is mounted on the end portion of the two-pipe pipe 2 so that the partition 3 is sandwiched by the mounting portions 4. When exhaust gas is delivered from an exhaust source (not shown) connected to the pipe lines 2a and 2b of the two-pipe pipe 2, the blades 6a and 6b are opened by the wind pressure, and the exhaust gas is discharged outdoors. If the exhaust gas is not delivered from each exhaust source (not shown), the blades 6a and 6b are closed by the pressing force of the coil springs 8a and 8b, and each of the pipelines 2
a and 2b are closed.

[0004]

In the conventional backflow prevention damper 1, the blades 6a and 6b have springs 8a and 8b.
When it is closed by the pressing force of, since the inside of the two-pipe pipe 2 is completely sealed by the rubber packings 9a and 9b, the dew condensation water (due to the humidity in the bath) inside the pipe is inside the backflow prevention damper 1. Accumulated on the blade 6
The a and 6b were sometimes stuck to the ring-shaped portion 5 by the condensed water, and the blades 6a and 6b sometimes did not work well.

Therefore, a main object of the present invention is to provide a backflow preventive damper capable of reliably opening and closing the blade.

[0006]

SUMMARY OF THE INVENTION The present invention is a ring-shaped member having a mounting portion mounted on a partition of a multi-pipe pipe and an outer shape formed on the mounting portion and extending along the inner surface of each pipe line of the multi-pipe pipe. Department,
A blade which is attached to the attachment portion so as to individually open and close each pipe of the multi-passage pipe and which abuts the ring-shaped portion in the closed state, and the ring-shaped portion by connecting the attachment portion and the ring-shaped portion In the backflow prevention damper including a reinforcing portion for reinforcing, the backflow prevention damper is characterized in that a drain cutout portion is formed by deforming a part of the outer shape of the ring-shaped portion with respect to the inner surface.

[0007]

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
Usually, it is closed by the pressing force of the spring. But,
The condensed water in the pipe flows out from the drain cutout formed in the ring-shaped portion. Therefore, condensed water does not collect in the pipe.

[0008]

According to the present invention, since the condensed water does not collect in the pipe, the blade can be surely opened and closed without the blade sticking to the ring-shaped portion. 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.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 3, a backflow prevention damper 10 of this embodiment is a two-pipe line in which one end of each of the pipe lines 12a and 12b is connected to an individual exhaust source (bath, toilet, etc.) not shown. It is attached to the other end of the 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 the open end of the mounting portion 18,
A ring-shaped portion 20 having an outer shape along the inner surface of the two-pipe pipe 14.
a and 20b are formed.

The ring-shaped portions 20a and 20b are substantially D-shaped members extending along the inner surfaces of the pipe lines 12a and 12b, and the drain notches 22a are provided at both ends of the straight line portions, as can be seen from FIG. And 22b are formed. In this embodiment, the drain notch portions 22a and 22b are formed in two upper and lower portions in order to eliminate the vertical directionality of the backflow prevention damper 10, but they may be formed in only one lower portion.

Further, as shown in FIG. 2, the rubber ring grooves 24a and 24b are provided at predetermined positions along the entire outer circumference.
Is formed, and the rubber rings 26a and 26b are attached to the rubber ring grooves 24a and 24b. 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, as shown in FIG. 1, ring-shaped portions 20a and 20b are provided.
Of the substantially cylindrical bearings 30a and 3
0b is attached.

The body 16 is connected with blades 32a and 32b, which are made of synthetic resin such as polyethylene and have a substantially semi-disc shape, for opening and closing the conduits 12a and 12b of the two-pipe pipe 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. In addition, the bearing 34b and the coil spring 36b formed on the blade 32b
And are aligned with bearings 30b mounted on body 16 and through which shaft 38b is threaded, thereby connecting blade 32b and 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.

Such a backflow prevention damper 10 is mounted on the end of the two-pipe pipe 14 so that the partition 38 is sandwiched between the mounting portions 18. Then, as shown in FIG. 3, 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. At this time, the backflow prevention damper 10 is securely attached to the two-pipe pipe 14 by the friction of the rubber rings 26a and 26b attached to the outer circumferences of the ring-shaped portions 20a and 20b so as to come into contact with the inner surface of the two-pipe pipe 14. Since it is supported, the backflow prevention damper 10 will not be displaced or fall off due to the wind pressure from the exhaust source.

The blades 32a and 32b are provided with a coil spring 36 unless exhaust air is sent from each exhaust source (not shown).
closed by the pressing force of a and 36b,
a and 12b are closed. In this case, the dew condensation water generated in the two-pipe pipe 14 due to the humidity of the bath or the like flows out through the drain notches 22a and 22b (FIG. 1), so that the dew condensation water does not accumulate in the pipe. Therefore,
The blade causes the ring-shaped portions 20a and 20
The blades 32a and 32b can be reliably opened and closed without sticking to b.

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 a cross-sectional view of the embodiment of FIG.

FIG. 3 is an illustrative view showing a usage state of the embodiment in FIG. 1;

FIG. 4 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 22a, 22b ... Drain notch part 26a, 26b ... Rubber ring 28a, 28b ... Reinforcement part 30a, 30b, 34a, 34b ... Bearing 36a, 36b ... Coil spring 38 ... Partitions 38a, 38b ... Shaft 44 ... Expansion / contraction adapter

Claims (1)

[Claims] 1. A mounting portion to be 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, and the multi-pipe. A blade that is attached to the attachment portion so as to individually open and close each of the passages of the passage pipe and abuts the ring-shaped portion in the closed state, and connects the attachment portion and the ring-shaped portion to each other. A backflow prevention damper comprising: a reinforcing portion that reinforces the ring-shaped portion, wherein a part of the outer shape of the ring-shaped portion is deformed with respect to the inner surface to form a drain cutout portion. .