Fire sensor

Abstract

To provide a fire sensor capable of improving visibility of a display section.SOLUTION: A fire sensor comprises: a detection section 21 which detects heat; a main body section 30 which is installed on an installation surface and holds the detection section 21 while exposing it on the side opposed with the installation surface; a guard section which is provided around the detection section 21 and protects the detection section 21; and a display mechanism which includes a light-emitting portion and performs display with light from the light-emitting portion. The main body section 30 includes a front face portion 30b which is exposed toward the side opposed with the installation surface, and the guard section includes an outline portion 32 including an opening disposed on the side separated from the installation surface farther than the front face portion 30b. In a state where the display with light is performed, the front face portion 30b is viewed from a position away from the outline portion 32 at the side opposed with the installation surface, such that the light from the light-emitting portion is indirectly visible via the opening.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fire detector that is fixed to an installation surface such as a ceiling surface of a building and detects the occurrence of a fire. [Background technology]

[0002] A fire detector that detects the occurrence of a fire is fixed to an installation surface such as the ceiling of a building. Examples of fire detectors include fire detectors that have a heat detection unit that detects heat caused by a fire. In addition, fire detectors that detect smoke, fire detectors that detect gas, and fire detectors that combine these functions are also known.

[0003] A fire detector may be provided with a display unit that uses light to indicate an operating state, such as a fire alarm. A light-emitting diode (LED), for example, is used as a light-emitting unit that constitutes the display unit of the fire detector. The light-emitting unit is provided inside the body of the fire detector, and light is guided to the outside by a light guide or the like. An example of such a fire detector is that shown in Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-215865 A Summary of the Invention [Problem to be solved by the invention]

[0005] The fire detector in Patent Document 1 is a sealed type, and a light guide section is provided over almost the entire housing, so that the light can be seen from a wide range. However, there are some fire detectors for which it is difficult to provide a light guide section over the entire housing, such as fire detectors with exposed thermistors. Even in such cases, a fire detector in which the light from the display section is easily visible is desired.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a fire detector capable of improving the visibility of a display unit. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the fire detector of the present invention has a detection unit that detects heat, a main body unit that is installed on an installation surface and holds the detection unit exposed on the side facing the installation surface, a guard unit that is provided around the detection unit to protect the detection unit, and a display mechanism that includes a light-emitting unit and displays using light from the light-emitting unit, wherein the main body unit has a front portion that is exposed toward the side facing the installation surface, and the guard unit has an outer casing with an opening that is positioned on a side away from the installation surface than the front portion, and when the display using light is being displayed, the light from the light-emitting unit can be indirectly seen through the opening by viewing the front portion from a position away from the outer casing on the side facing the installation surface. Effect of the Invention

[0008] According to the fire detector of the present invention, the visibility of the display unit can be improved. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of a fire detector according to an embodiment of the present invention, seen from the front side. [Diagram 2] FIG. [Diagram 3] 3 is a cross-sectional view taken along the line AA in FIG. 2, which is closer to the front side than the front portion. [Figure 4] 1 is a front view of a fire detector showing an area that is illuminated by a reflecting portion when a display portion is illuminated. [Diagram 5] FIG. 11 is an explanatory cross-sectional view of a display unit according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described in detail with reference to the drawings. A fire detector 10 of this embodiment is fixed to an installation surface such as a ceiling of a building and detects heat generated by a fire. Fig. 1 shows a perspective view of the fire detector 10 of this embodiment as seen from the front side, and Fig. 2 shows a front view of the fire detector 10. As shown in these drawings, the fire detector 10 of this embodiment has a housing 20 fixed to an installation surface and a heat detection unit 21 that detects heat generated by a fire.

[0011] The housing 20 has a main body 30 that houses a board or the like on which various components for detecting a fire and transmitting a fire detection signal are arranged. The main body 30 has a substantially cylindrical rear part 30a and a substantially disk-shaped front part 30b with a larger diameter than the rear part 30a. When the housing 20 is fixed to the installation surface, the rear part 30a is embedded in the back side of the installation surface and only the front side of the front part 30b is exposed.

[0012] The housing 20 is made of a resin material such as plastic, but may be made of other materials.

[0013] The heat detection unit 21 is provided so as to protrude in the height direction from the main body 30 of the housing 20. The heat detection unit 21 is configured by a thermistor, and is capable of detecting heat at its tip.

[0014] The main body 30 is provided with a guard section for protecting the heat detection section 21. The guard section has a side column section 31 rising in the height direction from the front section 30b, an outer section 32 supported by the side column section 31, a guard support section 33 extending from the outer section 32 toward the center, and a central guard section 34 supported by the guard support section 33.

[0015] A plurality of side pillars 31 are formed in the circumferential direction and are arranged at equal intervals in the circumferential direction. The side pillars 31 support an outer shell 32 at their tops. The outer shell 32 has a circular ring shape with a certain width and is arranged spaced apart from the main body 30 in the height direction.

[0016] At three circumferential positions of the outer shell 32, arm-shaped guard support parts 33 are provided which rise from the outer shell 32 and extend toward the center. The guard support parts 33 support a central guard part 34 at the center. The central guard part 34 has a small diameter annular shape. The heat detection part 21 is disposed at the center of the main body 30, and its tip is disposed at a lower position than the central guard part 34, and is therefore covered by the central guard part 34.

[0017] The main body 30 has two display units 22 at positions on the outer circumferential side of the central guard unit 34. The two display units 22 are arranged at the 3 o'clock and 9 o'clock circumferential positions in FIG. 2. A light-emitting unit (not shown) made of an LED is provided inside the main body 30, and the display units 22 are light guides that guide light from the light-emitting unit to the outside. The display units 22 can be illuminated by the light-emitting unit emitting light.

[0018] The front part 30b of the main body part 30 has an identification label part 50 at the circumferential position of 3 o'clock in FIG. 2 on the front side of the recessed part 40 on the outer periphery side. The identification label part 50 is formed of a sticker or the like that can be attached to the main body part 30. The identification label part 50 has a mark printed thereon according to the type of the fire detector 10. Fire detectors are classified into a plurality of types according to the fire detection method, such as a differential spot type or a constant temperature spot type that detects heat, and a photoelectric spot type or a photoelectric separation type that detects smoke. Fire detectors are also classified into different types according to functions such as the presence or absence of a test function, or the sensitivity of fire detection. The mark on the identification label part 50 has a different design for each of these types. The fire detector 10 of this embodiment is classified into a differential spot type with a test function, and therefore has a mark corresponding to this type. By applying such a unique mark according to the type to the fire detector, the type of the fire detector can be easily identified during installation or maintenance, and work can be performed quickly and reliably.

[0019] 3 shows a cross-sectional view of the front side of the front portion 30b in the AA cross section of FIG. 2. As shown in this figure, a recess 40 is formed in the center of the front portion 30b. The recess 40 has a bottom surface portion 43 facing in the height direction and a side surface portion 41 rising from the bottom surface portion 43. The two display units 22 are disposed in the recess 40. In addition, the display units 22 have a height greater than the depth of the recess 40, and slightly protrude from the recess 40 in the height direction.

[0020] A side reflecting portion 42 is provided on a side surface portion 41 of the recess 40. The side reflecting portion 42 is formed of a thin-film sticker or the like having a reflective material that reflects light. As shown in Fig. 2, the side reflecting portion 42 is provided over a portion of the side surface portion 41 that faces the display unit 22 and an area in the vicinity thereof.

[0021] 3, an opposing surface reflector 36 is provided on an opposing surface 35, which is the surface of the outer shell 32 constituting the guard portion that faces the main body 30. A bottom reflector 44 is provided on a bottom 43 of the recess 40 that faces the opposing surface reflector 36. The bottom reflector 36 is located inside a circular area having a center position at the exposed location of the heat detection unit 21 in the main body 30 and a radius from this center position to the display unit 22. Similar to the side reflector 42, the opposing surface reflector 36 and the bottom reflector 44 can be formed of a thin-film seal having a reflective material that reflects light.

[0022] The above-mentioned identification label unit 50 provided on the main body unit 30 has a reflective unit 51 that reflects light. The reflective unit 51 is formed by providing a reflective material on the identification label unit 50. The identification label unit 50 also has a luminous unit 52. The luminous unit 52 is formed by applying or impregnating the identification label unit 50 with luminous paint or the like.

[0023] Of the light from the display unit 22, light heading toward the side surface portion 41 is reflected by the side surface reflecting portion 42 as shown in ray L1 in Fig. 3, and is thereby able to travel at an angle in the height direction and horizontal direction of the main body unit 30. Also, of the light from the display unit 22, light heading toward the outer shell portion 32 is reflected by the opposing surface reflecting portion 36 of the outer shell portion 32 as shown in ray L2 in Fig. 3, and is further reflected by the bottom surface reflecting portion 44 provided on the bottom surface portion 43 of the main body unit 30, and is thereby able to travel at an angle in the height direction and horizontal direction of the main body unit 30.

[0024] Of the light from the display unit 22, a part of the light heading toward the outer periphery of the main body unit 30 reaches the identification label unit 50 and is reflected by the reflecting portion 51 of the identification label unit 50, as shown by light ray L3 in Fig. 3. This allows the identification label unit 50 to be illuminated by the light from the display unit 22.

[0025] 4 shows a front view of the fire detector 10 with the display unit 22 illuminated. As shown in this figure, when the display unit 22 illuminates, not only the display unit 22 but also the part of the side unit 41 where the side reflector 42 is provided, the part of the bottom unit 43 where the bottom reflector 44 is provided, and the identification label unit 50 are illuminated by the reflected light. Since the light reflected by the side reflector 42 and the bottom reflector 44 also travels at an angle to the horizontal direction of the main body 30, when the fire detector 10 is installed on the ceiling of a building, it is easy to see that the fire detector 10 is illuminated even from diagonally below the fire detector 10. Therefore, the display by the display unit 22 can be seen from a wide range.

[0026] Furthermore, by illuminating the identification label unit 50 with light from the display unit 22, the visibility of the identification label unit 50 is improved by illuminating the display unit 22 during installation or maintenance of the fire detector 10, and the type of the fire detector 10 can be easily identified. In particular, when the fire detector 10 is installed in a dark place, the illumination of the identification label unit 50 can facilitate the work.

[0027] In addition, the identification label unit 50 has a luminous section 52 that stores light by receiving light from the display unit 22, so it can continue to glow for a while even after the light from the display unit 22 goes out. This allows the identification label unit 50 to be more reliably seen and improves operability when the fire detector 10 is installed in a dark place, for example.

[0028] Although the embodiment of the present invention has been described above, the application of the present invention is not limited to the embodiment, and the present invention can be applied in various ways within the scope of its technical concept.

[0029] Although the fire detector 10 in the above embodiment is a small embedded type, the present invention can also be applied to other types of fire detectors. For example, the present invention can also be applied to an exposed type fire detector that is fixed to an installation surface via a mounting base. In addition, the fire detector 10 in the above embodiment detects a fire by detecting heat, but the fire detector may detect smoke or gas, or a combination of these, and the type is not important.

[0030] Furthermore, in the main body 30, the reflective portion can be disposed in any position other than that of the above-described embodiment as long as it is capable of reflecting light from the display unit 22. For example, a reflective portion may be provided on the side pillar portion 31 rising from the main body 30. A reflective portion may also be provided on the surface of the central guard portion 34 constituting the guard portion that faces the main body 30. The position and number of the display unit 22 in the main body 30 can also be set arbitrarily, and a reflective portion can be provided in a position that can reflect light from the display unit 22 accordingly.

[0031] In addition, in the above-described embodiment, a side reflective portion 42 is provided on the side portion 41, an opposing surface reflective portion 36 is provided on the outer portion 32, a bottom reflective portion 44 is provided on the bottom portion 43, and a reflective portion 51 is provided on the identification label portion 50, but it is also possible to provide only the side reflective portion 42, or only the opposing surface reflective portion 36 and the bottom reflective portion 44, or only the reflective portion 51 on the identification label portion 50, or two of these reflective portions may be provided.

[0032] In addition, in the above-described embodiment, each reflective portion is provided on a sticker affixed to the main body portion 30, but the main body portion 30 itself may have a reflective material, or the reflective portion may be provided by other methods, such as applying paint having a reflective material to the main body portion 30.

[0033] In addition, in the above-described embodiment, a bottom reflective portion 44 is provided on the bottom portion 43 of the recess 40, but each component on the front of the fire detector 10, for example, the side pillar portion 31, the outer shell portion 32, the guard support portion 33, and the central guard portion 34, may be formed from a transparent material so as to transmit light from the light-emitting portion in the main body portion 30, thereby illuminating the front side of the fire detector 10.

[0034] In the above embodiment, the reflected light from the display unit 22 is incident on the bottom reflector 44 and reflected by the bottom reflector 44. However, the light from the display unit 22 may be directly incident on the bottom reflector 44. In the above embodiment, the display unit 22 functions as a front light guide that guides light toward the front side of the main body and a side light guide that guides light toward the side reflector 42. FIG. 5 shows an explanatory cross-sectional view of the display unit 22 in another form. As shown in this figure, by providing a light guide path with a different refractive index inside the display unit 22, the light can be directed directly toward the bottom unit 43. The display unit 22 is provided with a curved bottom light guide 22c, both ends of which face the light emitting unit 23 and the bottom reflector 44, as a light guide path. A part of the light from the light emitting unit 23 is emitted to the bottom unit 43 by the bottom light guide 22c and reflected by the bottom reflector 44. The light is directly emitted to the front and side without passing through a light guide path. Therefore, the front surface of the display unit 22 is the front light guide unit 22a, and the side surface of the display unit 22 is the side light guide unit 22b. By providing the bottom light guide unit 22c that guides light toward the bottom reflector 44 in this manner, the light from the display unit 22 can be directed directly toward the bottom reflector 44. [Explanation of symbols]

[0035] 10 Fire detector 20. Cabinet 21 Heat detection unit 22 Display section 30 Main body 30a Back part 30b Front part 31 Side pillar 32 Outer Wall 33 Guard support part 34 Central Guard Section 35 Opposite surface part 36 Opposing surface reflection section 40 Recess 41 Side part 42 Side reflector 43 Bottom part 44 Bottom reflector 50 Identification label section 51 Reflector 52 Luminous part

Claims

[Claim 1] A detection unit that detects heat; A main body portion that is installed on an installation surface and holds the detection portion so that the detection portion is exposed on a side facing the installation surface; a guard portion provided around the detection portion to protect the detection portion; A display mechanism including a light-emitting unit and performing display using light from the light-emitting unit; The main body has a front surface exposed toward a side opposite to the installation surface, The guard portion has an outer shell portion having an opening disposed on a side farther away from the installation surface than the front portion, This fire detector allows the light from the light-emitting element to be indirectly seen through the opening by viewing the front part from a position away from the outer casing on the side opposite the installation surface when the light display is being performed.

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