Air tube for differential distributed sensor

Abstract

To provide an air tube for a differential distributed sensor that is low cost and has little impact on aesthetics of an installation area.SOLUTION: The air tube for a differential distributed sensor according to the present invention specularly reflects ambient light.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an air pipe of a differential distributed sensor for detecting a fire.

Background Art

[0002] A fire detector senses smoke, heat, etc. and transmits a fire information signal to a fire receiver. Then, the fire receiver that has received the fire information signal issues a fire alarm. Many cultural properties are made of materials such as wood that are vulnerable to fire, so fire prevention measures are important. However, installing a fire detector in a cultural property is not preferred because it greatly affects the aesthetic appearance of the cultural property.

[0003] For cultural properties, a differential distributed sensor as described in Patent Document 1 can be used. The differential distributed sensor lays a thin copper pipe air pipe in the fire detection area, and detects the air expansion due to the rapid temperature rise in the air pipe caused by a fire to sense the fire. The air pipe of the differential distributed sensor is less conspicuous compared to a spot-type smoke detector or heat detector, and is less likely to damage the aesthetic appearance of cultural properties and the like.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Although the differential distributed sensor does not damage the aesthetic appearance more than other fire detectors, since the air pipe formed of a copper pipe or the like is widely exposed in the fire detection area, it still affects the aesthetic appearance. It is also conceivable to color the air pipe, but it is necessary to prepare colored air pipes corresponding to various colors according to the laying location, which results in high costs.

[0006] An object of the present invention is to provide an air pipe of a differential distributed sensor that is low-cost and has little impact on the aesthetics of the installation area.

Means for Solving the Problems

[0007] The air pipe of the differential distributed sensor in one embodiment of the present invention is characterized by specularly reflecting ambient light.

Effects of the Invention

[0008] According to the present invention, a differential distributed sensor that is low-cost and has little impact on the aesthetics of the installation area can be obtained.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0010] First, in FIG. 1, a fire alarm system using a differential distributed sensor 3 is shown. The differential distributed sensor 3 has a pressure sensing unit 31 and the air pipe 32 of Example 1. The air pipe 32 is laid on the ceiling or the like of the building to be monitored for fire. Then, the differential distributed sensor 3 captures the pressure change of the internal air of the air pipe 32 due to the heat of the fire by the pressure sensing unit 31 to detect the fire. When the pressure sensing unit 31 detects a fire, a fire information signal is sent to the fire receiver 1 via the wiring 2, and the fire receiver 1 gives a fire alarm. The same applies to the air pipes 33 to 37 in and after Example 2.

Example

[0011] FIG. 2 shows a cross-sectional view of the air pipe 32 of Example 1. The air pipe 32 has a metal air holding pipe 321 that holds air inside and a resin coating 322 that covers the periphery of the air holding pipe 321. Further, a reflective layer 323 is provided on the outside of the coating 322, and the surrounding light is specularly reflected by the reflective layer 323. In a cross-section in a plane perpendicular to the extending direction of the air pipe 32, the inner and outer surfaces of the air holding pipe 321, the coating 322, and the reflective layer 323 are circular. The air holding pipe 321 of Example 1 is made of copper and can be bent at a curvature such that the inside does not collapse when laid in a building. Further, the reflective layer 323 is formed by vapor-depositing aluminum on the outside of the coating 322 to form a mirror coating. As shown in FIG. 2, the incident light IL due to the surrounding light is reflected by the reflective layer 323 to become the reflected light RL.

[0012] Fig. 3 shows a cross-sectional view of the air duct 32 of Example 1 installed at the corner D of the ceiling. The air duct 32 is installed at the corner D formed by the ceiling board 4 and the beam 5 provided below the ceiling board 4. When viewed from the direction of the reflected light RL in Fig. 3, most of the reflected light RL is the light incident IL from the ceiling board 4 and the beam 5 reflected by the reflective layer 323 of the air duct 32. Therefore, when viewed from the visual position at the tip of the reflected light RL, the ceiling board 4 and the beam 5 are reflected on both sides of the air duct 32. As a result, most parts of the air duct 32 have the color tone near the ceiling of the building and look like a protective color, and the air duct 32 assimilates with the area near the ceiling and is not conspicuous. Further, when the floor surface or the like has the same color tone as the area near the ceiling, most of the air duct 32 has the same color tone as the area near the ceiling, so it is even less conspicuous. These are the same even when the visual position changes.

[0013] By using the air duct 32 of Example 1, for example, when the area near the ceiling is the color of wood like in a traditional Japanese house, the air duct 32 reflects the surrounding light and becomes the color of wood. Therefore, the air duct 32 assimilates with the area near the ceiling and is not conspicuous. Also, when a white mortar interior is used near the ceiling in modern architecture, the air duct 32 reflects the surrounding light and becomes white, assimilating with the area near the ceiling and not being conspicuous.

[0014] In Fig. 3, the air duct 32 is laid at the corner D formed by the ceiling board 4 and the beam 5, but it may also be laid at other corners formed on the ceiling such as the ceiling and the wall. Also, the air duct 32 may be laid at a flat place that is not the corner D on the side surface of the beam 5 or the lower surface of the ceiling board 4.

Example

[0015] FIG. 4 is a cross-sectional view of the air pipe 33 of Example 2. The air pipe 33 of Example 2 can also be connected to the pressure sensing unit 31 as shown in FIG. 1 to form the differential distributed type sensor 3. The air pipe 33 has a metal air holding pipe 331 that holds air inside, and a transparent resin transparent coating 332 that covers the periphery of the air holding pipe 331. Further, a reflective layer 333 is provided outside the air holding pipe 331, and ambient light is specularly reflected by the reflective layer 333 inside the transparent coating 332. In a cross-section in a plane perpendicular to the extending direction of the air pipe 33, the inner and outer surfaces of the air holding pipe 331, the transparent coating 332, and the reflective layer 333 are circular. The air holding pipe 331 of Example 2 is made of copper. Further, the reflective layer 333 is formed by mirror coating by vapor-depositing aluminum on the outside of the air holding pipe 331. As shown in FIG. 4, the incident light IL due to ambient light enters the transparent coating 332, is reflected by the reflective layer 333, and exits the transparent coating 332 to become the reflected light RL.

[0016] Similar to the air pipe 32 of Example 1, the air pipe 33 of Example 2 also reflects the incident light IL from near the ceiling and assimilates with the vicinity of the ceiling, so it is not conspicuous. The transparent coating 332 of the air pipe 33 may be formed thinly. Further, the transparent coating 332 may be omitted so that the reflective layer 333 formed on the surface of the air holding pipe 331 is exposed.

Example

[0017] FIG. 5 is a cross-sectional view of the air pipe 34 of Example 3. The air pipe 34 has a metal air holding pipe 341 that holds air inside, and a resin coating 342 that covers the periphery of the air holding pipe 341. The air holding pipe 341 of Example 3 is made of copper. Further, a reflective layer 343 is provided on the outside of the coating 342, and ambient light is specularly reflected by the reflective layer 343. In Example 3, in a cross-section taken in a plane perpendicular to the extending direction of the air pipe 34, the air holding pipe 341 is cylindrical. Also, the inner surface of the coating 342 is in close contact with the outer surface of the air holding pipe 341 and is circular. However, in the above cross-section, a protruding portion 344 protruding to one side is formed on the outer surface of the coating 342. The protruding portion 344 is formed along the extending direction of the air holding pipe 341. The reflective layer 343 is formed by mirror coating by vapor-depositing aluminum on the outside of the coating 342. As shown in FIG. 5, the incident light IL due to ambient light is reflected by the reflective layer 343 to become reflected light RL.

[0018] Similar to the air pipe 32 of Example 1 and the air pipe 33 of Example 2, the air pipe 34 of Example 3 also reflects the incident light IL from near the ceiling and blends in with the vicinity of the ceiling, so it is not conspicuous. The air pipe 34 of Example 3 is preferably laid in a building such that the protruding portion 344 faces downward or obliquely downward. FIG. 6 shows a situation where the protruding portion 344 is installed on the air pipe 34 so as to be on the opposite side of the corner D of the ceiling. As shown by the incident light IL and the reflected light RL, when the protruding portion 344 faces in the direction of an obliquely downward viewing position, the reflected light RLu obtained by reflecting the incident light ILu from near the viewing position by the reflective layer 343 is less likely to return to the viewing position. Since the viewing position is below the air pipe 34, if the air pipe 34 is installed with the protruding portion 344 facing downward, the reflected light RLu is less likely to return to the viewing position regardless of the shape of the ceiling, including a flat ceiling. And, the reflected light RL reaching the viewing position is mostly the light reflected from the incident light IL from the ceiling near the air pipe 34.

Example

[0019] FIG. 7 is a cross-sectional view of the air pipe 35 of Example 4. The air pipe 35 has a metal air holding pipe 351 that holds air inside, and a resin coating 352 that covers the periphery of the air holding pipe 351. Further, a reflective layer 353 is provided on the outside of the coating 352, and ambient light is specularly reflected by the reflective layer 353. The air holding pipe 351 of Example 4 is made of copper and is cylindrical. Also, the inner surface of the coating 352 is in close contact with the outer surface of the air holding pipe 351 and is circular. And, similar to Example 3, a protruding portion 354 that protrudes on one side in the cross-section in a plane perpendicular to the extending direction of the air pipe 35 is formed on the outer surface of the coating 352. The protruding portion 354 is formed along the extending direction of the air holding pipe 351. The reflective layer 353 is formed by mirror coating by vapor-depositing aluminum on the outside of the coating 352. In Example 4, further, a non-reflective layer 355 is formed near the tip of the protruding portion 354. In Example 4, the non-reflective layer 355 is a black layer. As shown in FIG. 7, the incident light IL by ambient light is reflected by the reflective layer 353 to become the reflected light RL.

[0020] The air pipe 35 of Example 4 also reflects the incident light IL from near the ceiling and assimilates with the vicinity of the ceiling in the same manner as the air pipe 34 of Example 3, etc., so it is not conspicuous. The air pipe 35 of Example 4 is preferably laid in a building such that the protruding portion 354 is downward or obliquely downward. When the protruding portion 354 faces the direction of the visual recognition position that is downward or obliquely downward, as shown in FIG. 6 of Example 3, the reflected light RLu obtained by reflecting the incident light ILu from near the visual recognition position by the reflective layer 353 is unlikely to return to the visual recognition position. And, the reflected light RL reaching the visual recognition position is mostly the one obtained by reflecting the incident light IL from the ceiling near the air pipe 35. And, the air pipe 35 of Example 4 has a non-reflective layer 355 along the extending direction. In the air pipe 34 of Example 3, the tip of the protruding portion 344 may be rounded and shine linearly and be visually recognized, but in the air pipe 35 of Example 4, the tip of the protruding portion 354 is unlikely to shine and be visually recognized due to the non-reflective layer 355. Therefore, the air pipe 35 of Example 4 is even less conspicuous than the air pipe 34 of Example 3.

Example

[0021] In Examples 3 and 4, the protruding portions protrude in one direction, but they may also protrude in a plurality of directions. For example, the coating and the reflective layer may be square in cross-section. FIG. 8 shows a cross-sectional view of the air duct 36 of Example 5 installed along the corner D of the ceiling formed by the ceiling plate 4 and the beam 5 provided below the ceiling plate 4. The air duct 36 is covered by a coating 362 around a cylindrical air holding tube 361. In the cross-section in a plane perpendicular to the extending direction of the air duct 36, the outer surface of the coating 362 and the reflective layer 363 are square, and the four corners of the coating 362 are protruding portions 364. Among the four protruding portions 364, a non-reflective layer 365 is formed on the protruding portion 364 at the corner of the reflective layer 363 away from the ceiling. In Example 5, the non-reflective layer 365 is a black layer provided at the corner away from the ceiling along the extending direction of the air duct 36.

[0022] When viewed from the direction of the reflected light RL in FIG. 8, the reflected light RL is basically the incident light IL from the ceiling plate 4 or the beam 5 reflected by the reflective layer 363 of the air duct 36. Therefore, when viewed from the visual position at the tip of the reflected light RL, the ceiling plate 4 and the beam 5 are reflected on the reflective layer 363 of the air duct 36, so that the air duct 36 has the color tone near the ceiling of the building and becomes like a protective color, and the air duct 36 assimilates with the vicinity of the ceiling and is not conspicuous. Furthermore, the non-reflective layer 365 prevents linear light as in Example 4. Therefore, the air duct 36 is more difficult to visually recognize.

[0023] In the air duct 36 of Example 5, the non-reflective layer 365 is provided on one of the four protruding portions 364, but it may also be provided on the other protruding portions 364. If the non-reflective layer 365 is provided on all the protruding portions 364, when installing at the corner D of the ceiling, the protruding portion 364 can be aligned with the corner D without considering the direction of the non-reflective layer 365, and the installation is easy. Conversely, even if the non-reflective layer 365 is not provided, the effect of not being conspicuous on the ceiling is produced.

[0024] In FIGS. 3, 6, and 8, the air duct 32 or the like is provided at the corner D of the ceiling so as to increase the reflection of the ceiling. However, even if it is installed at a flat place other than the corner D on the lower surface of the ceiling board 4, since there is a part that is reflected by the ceiling and visually recognized, the air duct 32 or the like is not very conspicuous. In particular, when the wall surface and the floor surface are the same color as the ceiling, even if the air duct 32 or the like is provided on the lower surface of the flat ceiling board 4, it is not conspicuous.

Embodiment

[0025] As an example in which the protruding portions protrude in a plurality of directions, the covering and the reflective layer may be triangular in cross section. FIG. 9 shows a cross-sectional view of the air duct 37 of Example 6 installed on the lower surface of the flat ceiling board 4. The air duct 37 is covered by a covering 372 around a cylindrical air holding tube 371. And in the cross section in the plane perpendicular to the extending direction of the air duct 37, the outer surface of the covering 372 and the reflective layer 373 are equilateral triangles, and the three corners of the covering 372 are protruding portions 374. Further, among the three protruding portions 374, a non-reflective layer 375 is formed at the corner of the reflective layer 373 away from the ceiling board 4. In Example 6, the non-reflective layer 375 is a black layer provided at the corner away from the ceiling along the extending direction of the air duct 37.

[0026] When viewed from the direction of the reflected light RL in FIG. 9, the reflected light RL is basically the incident light IL from the ceiling board 4 reflected by the reflective layer 373 of the air duct 37. Therefore, when viewed from the visual recognition position at the tip of the reflected light RL, since the ceiling board 4 is reflected on the reflective layer 373 of the air duct 37, the air duct 37 has the color tone near the ceiling of the building and becomes like a protective color, and the air duct 37 assimilates with the vicinity of the ceiling and is not conspicuous. Further, the non-reflective layer 375 prevents linear light. Therefore, the air duct 37 is more difficult to visually recognize.

[0027] The surface of the air duct in cross section may be elliptical. Further, as in Example 2, in the air duct in which the surface of the air holding tube is a reflective layer, the outer surface of the air holding tube may protrude in at least one direction.

[0028] In the air pipes 34, 35, 36, and 37 of Examples 3 to 6, the surface for specular reflection projects at least partially in the cross section of the air pipes 34, 35, 36, and 37. And even when a reflective layer is provided on the outer surface of the air holding pipe as in the air pipe 33 of Example 2, the surface for specular reflection may project at least partially in the cross section of the air pipe.

[0029] The coating in the examples is formed of a flexible resin. However, in the air pipes 34, 35, 36, and 37 of Examples 3 to 6, the coatings 342, 352, 362, and 372 have a deformed outer shape and project at least partially in the cross section, resulting in thick portions. When installing such air pipes 34, 35, 36, and 37 in a building, if the coatings 342, 352, 362, and 372 are peeled off with a knife or the like at the bent portion, the air pipes 34, 35, 36, and 37 can be easily bent and installed.

[0030] In the embodiment, a differential distributed type sensor for detecting a fire on the ceiling of a building, which is a cultural property, has been described. However, in addition to cultural properties, the air pipes of the above-described differential distributed type sensor can also be used in art museums, concert halls, theaters, etc. so as not to impair the aesthetics. Also, the above air pipes can be used in buildings without a ceiling and with an exposed attic. Furthermore, for facilities where there is no need to pay attention to aesthetics, the above air pipes may be used to improve the aesthetics. The non-reflective layer such as in Example 4 may not be provided. When installing in a building with a bright ceiling such as white, it is preferable not to have the non-reflective layer such as in Example 4.

[0031] In addition, the specific configuration is not limited to the embodiment, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention. Also, the above-described respective examples and modified examples can be combined by diverting each other's technologies as long as there are no particular contradictions or problems in their purposes and configurations.

Explanation of Reference Numerals

[0032] IL Incident light, ILu Incident light, RL Reflected light, RLu Reflected light, D Corner 1 Fire receiver, 2 Wiring, 3 Differential distributed sensor, 31 Pressure sensing part, 32 Air pipe, 321 Air holding pipe, 322 Coating, 323 Reflective layer, 33 Air pipe, 331 Air holding pipe, 332 Transparent coating, 333 Reflective layer, 34 Air pipe, 341 Air holding pipe, 342 Coating, 343 Reflective layer, 344 Protrusion, 35 Air pipe, 351 Air holding pipe, 352 Coating, 353 Reflective layer, 354 Protrusion, 355 Non-reflective layer 36 Air pipe, 361 Air holding pipe, 362 Coating, 363 Reflective layer, 364 Protrusion, 365 Non-reflective layer 37 Air pipe, 371 Air holding pipe, 372 Coating, 373 Reflective layer, 374 Protrusion, 375 Non-reflective layer 4 Ceiling board, 5 Beam

Claims

1. An air tube of a differential distributed sensor, characterized by specularly reflecting ambient light.

2. Having a metal air-retaining tube that retains air inside and a resin coating that covers the periphery of the air-retaining tube, specularly reflecting outside the coating, The air tube of the differential distributed sensor according to claim 1, characterized by the above.

3. Specularly reflecting outside a metal air-retaining tube that retains air inside, The air tube of the differential distributed sensor according to claim 1, characterized by the above.

4. Having a resin coating that covers the periphery of the air-retaining tube, The coating being transparent, The air tube of the differential distributed sensor according to claim 3, characterized by the above.

5. The surface that performs the specular reflection is characterized in that at least a part thereof protrudes in the cross-section of the air tube. The air tube of the differential distributed sensor according to any one of claims 1 to 4.

Images