JPH0350355Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a double-walled duct that is constructed in a jacket tubular shape and is attached to the open end of a double-pipe duct that opens into the outer wall of a double-pipe duct in which an outer duct is formed around the outer periphery of an inner duct. This invention relates to a fire prevention damper device for heavy pipes.

[Prior Art] A double-pipe duct in which an outer duct is formed around the outer periphery of an inner duct is sometimes employed as an outdoor terminal member of a ventilation system. With a double pipe duct, the exhaust path and air supply path can be constructed from a single member,
This is because the ventilation system can be configured simply. Conventionally, a fire prevention damper device for such a double-pipe duct has been disclosed in Japanese Utility Model Application Laid-open No. 49-9903. That is, it has a structure in which a fireproof damper that is closed by heat is installed in a hood-shaped main body that covers the entire open end of the double-pipe duct in the outer wall.

[Problems to be solved by the invention] In the above-mentioned conventional fire prevention damper device, the entire open end of the double pipe duct that opens on the outer wall is covered with a hood-shaped main body. If the duct forms an exhaust path and an air supply path,
There was a problem with the fire prevention damper device, such as air supply and exhaust short circuits (air shot circuits).

This invention was made in order to solve such conventional problems, and the object is to obtain a fireproof damper device for double pipes that is free from problems related to supply and exhaust short circuits.

[Means for Solving the Problems] The fire prevention damper device for double pipes according to this invention has an open bottom surface that covers the entire opening end in the outer wall of the double pipe duct from the outside, and a back surface on the wall mounting side. The outer shell of the main body is provided with an inner ventilation passage connected to the open end of the inner duct of the double-pipe duct and opened to the front of the outer shell of the main body in a fitted form. Each is provided with a fireproof damper that closes when exposed to heat, and the open portion of the lower surface of the outer shell of the main body is disposed below the open portion of the inner ventilation passage.

[Function] In this device, the inside of the main body is divided into two parts corresponding to the double pipe ducts, and a fire damper is attached to each part, so that the supply air flow and the exhaust air flow do not mix inside the main body. Since the opening on the lower surface of the outer shell of the main body is located at a lower level than the opening on the inner ventilation passage, supply/exhaust short circuits will not occur.

[Embodiment] FIG. 1, FIG. 2, and FIG. 3 all show this double pipe fire prevention damper device as an embodiment of the present invention. The fire prevention damper device for double pipes of this example has a jacket tubular shape, and covers from the outside the entire opening end opening into the outer wall W of the double pipe duct 3, in which the outer duct 2 is formed around the outer periphery of the inner duct 1. It has a main body outer shell 4 with an open lower surface and a back surface on the wall-mounting side. This main body outer shell 4 is provided with an inner ventilation passage 5 in a fitting form, one end communicating with the open end of the inner duct 1 of the double pipe duct 3 and the other end opening to the front surface of the main body outer shell 4. ing. Body outer shell 4
A fire prevention damper 6 is installed in each of the inner and inner ventilation passages 5, which closes when exposed to heat. The opening part 7 on the lower surface of the main body outer shell 4 opens downward,
A bird prevention net 8 is removably stretched.
The open part 9 of the inner ventilation passage 5 is located at a higher level than the open part 7, and in the one shown in FIG. 1, a vent cap 10 is attached, and in the one shown in FIG. It is covered by an open hood 11. The fire dampers 6 themselves are of known construction, both of which are held open by thermal fuses 12.

As shown in the figure, the fire prevention damper device for double pipes of this example is attached to the outer wall W so as to cover the entire open end of the double pipe duct 3 on the outer wall W from the outside. It prevents intrusion into the pipe duct 3 and performs a fire prevention function by the fire prevention damper 6.
Since the inside of the main body outer shell 4 is divided corresponding to the double pipe duct 3 and a fire damper 6 is attached to each, the supply air flow and the exhaust air flow do not mix inside the main body outer shell 4. Since the open part 7 on the lower surface of the main body outer shell 4 is located at a lower level than the open part 9 of the inner ventilation passage 5, no supply/exhaust short circuit occurs.

[Effects of the invention] As is clear from the above description of the embodiments, the fire prevention damper device for double pipes of the present invention has a lower surface that covers the entire open end of the double pipe duct in the outer wall from the outside, and a wall-mounted side. An inner ventilation passage that communicates with the open end of the inner duct of the double-pipe duct and opens to the front of the main body outer shell is provided in the outer shell of the main body, which is open to the rear surface of the main body, and an inner ventilation passage that connects with the open end of the inner duct of the double pipe duct and opens to the front of the outer shell of the main body. Each of the inner ventilation passages is provided with a fire prevention damper that closes when exposed to heat, and the open part of the lower surface of the outer shell of the main body is located below the open part of the inner ventilation passage. Since the supply air flow and the exhaust air flow do not mix within the outer shell, and the opening on the lower surface of the main body shell is located below the opening of the inner ventilation passage, there is an effect that no supply/exhaust short circuit occurs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of one embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view showing another embodiment. In the figure, 1 is an inner duct, 2 is an outer duct, 3 is a double pipe duct, 4 is an outer shell of the main body, 5 is an inner ventilation passage, 6 is a fire damper, and 7 and 9 are open parts. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] Jacket A double-pipe duct that is configured in a tubular shape and has an outer duct formed around the outer periphery of an inner duct.The outer shell of the main body has an open lower surface and a back surface on the wall-mounted side that covers the entire open end of the double-pipe duct that opens on the outer wall from the outside. ,
An inner ventilation passage that communicates with the open end of the inner duct of the double pipe duct and opens to the front of the main body outer shell is provided in a fitted form, and the inside of the main body outer shell and the inner ventilation passage receive heat respectively. A fire prevention damper device for a double pipe, characterized in that a fire prevention damper is provided which moves to close and close the main body, and an open portion of the lower surface of the outer shell of the main body is disposed below the open portion of the inner ventilation passage.