Fire detector

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] Fire detectors that detect fires are fixed to an installation surface such as the ceiling of a building. Examples of fire detectors include fire detectors with a heat detector that detects heat caused by a fire. Other known fire detectors include those that detect smoke, those that detect gas, and those that combine these functions.

[0003] Fire detectors are sometimes provided with a display unit that uses light to indicate the operating state, such as a fire alarm. A light-emitting diode (LED) or the like is used as the 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] Japanese Patent Application Laid-Open No. 2006-215865 Summary of the Invention [Problem to be solved by the invention]

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

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

[0007] In order to solve the above problems, the fire detector of the present invention comprises a detection unit that detects heat, a main body that is installed on an installation surface and holds the detection unit exposed on the side facing the installation surface, and a protection layer that is installed around the detection unit and protects the detection unit. Non-translucent The main body has a front surface exposed toward the side facing the installation surface, and the guard has an outer shell having an opening disposed on a side farther from the installation surface than the front surface. a plurality of guard support parts in the circumferential direction rising from the outer shell part and extending toward the center; and a central guard part supported by the guard support parts and positioned farther away from the installation surface than the tip of the detection part to cover the detection part. and when the display by the light is being performed, the front part is The central portion of the detecting portion By looking at the opening the area not covered by the guard support portion and the central guard portion. The light from the light emitting portion is indirectly visible through the lens. [Effects of the Invention]

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

[0009] [Figure 1] 1 is a perspective view of a fire detector according to an embodiment of the present invention, as viewed from the front side. [Figure 2] FIG. 2 is a front view of the fire detector. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2, showing the front side of the front portion. [Figure 4] 1 is a front view of a fire detector showing the area illuminated by the reflecting portion when the display portion is illuminated. FIG. [Figure 5] FIG. 10 is an explanatory cross-sectional view of a display unit of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[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 figures, the fire detector 10 of this embodiment has a housing 20 fixed to the 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 circuit board and 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 portion 30a and a substantially disk-shaped front portion 30b that has a larger diameter than the rear portion 30a. When the housing 20 is fixed to the installation surface, the rear portion 30a is buried in the back of the installation surface, and only the front side of the front portion 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 detecting section 21 is provided so as to protrude in the height direction from the main body 30 of the housing 20. The heat detecting section 21 is made up of 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 side columns 31 that rise in the height direction from the front face 30b, an outer shell section 32 supported by the side columns 31, a guard support section 33 that extends from the outer shell 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 the outer shell 32 at their tops. The outer shell 32 has an annular shape with a constant 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 portions 33 are provided, rising from the outer shell 32 and extending toward the center. The guard support portions 33 support a central guard portion 34 at their centers. The central guard portion 34 has a small-diameter annular shape. The heat detection unit 21 is disposed at the center of the main body 30, and its tip is positioned lower than the central guard portion 34, so it is covered by the central guard portion 34.

[0017] The main body 30 has two display units 22 located on the outer circumferential side of the central guard unit 34. The two display units 22 are located at the 3 o'clock and 9 o'clock positions in the circumferential direction 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 this light-emitting unit to the outside. When the light-emitting unit emits light, the display units 22 can glow.

[0018] The front portion 30b of the main body 30 has an identification label portion 50 at the 3 o'clock circumferential position in FIG. 2 , on the front side of the recess 40. The identification label portion 50 is formed of a sticker or the like that can be attached to the main body 30. A mark corresponding to the type of fire detector 10 is printed on the identification label portion 50. Fire detectors are classified into multiple types based on the fire detection method, such as differential spot type and constant temperature spot type that detect heat, and photoelectric spot type and photoelectric separation type that detect smoke. Fire detectors are also classified into different types based on functions such as the presence or absence of a test function, or fire detection sensitivity. The mark on the identification label portion 50 has a different design for each type. The fire detector 10 of this embodiment is a differential spot type classified as having a test function, and is therefore affixed with a mark corresponding to this type. By affixing such a unique mark corresponding to the type to the fire detector, the type of fire detector can be easily identified during installation and maintenance, enabling work to 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 43 facing in the height direction and a side surface 41 rising from the bottom surface 43. Two display units 22 are disposed in the recess 40. Furthermore, the display units 22 have a height greater than the depth of the recess 40, and protrude slightly from the recess 40 in the height direction.

[0020] A side surface reflecting portion 42 is provided on a side surface portion 41 of the recess 40. The side surface 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 surface 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 that constitutes the guard portion that faces the main body 30. A bottom surface reflector 44 is provided on a bottom surface 43 of the recess 40 that faces the opposing surface reflector 36. The bottom surface reflector 36 is located inside a circular area whose center is the exposed location of the heat detection unit 21 on the main body 30 and whose radius extends from this center to the display unit 22. Like the side surface reflector 42, the opposing surface reflector 36 and the bottom surface reflector 44 can be formed from a thin-film sticker or the like that has 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 by 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. Furthermore, 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 by 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 portion of the light directed 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 portion of the side surface 41 where the side reflector 42 is provided, the portion of the bottom surface 43 where the bottom reflector 44 is provided, and the identification label 50 are illuminated by the reflected light. Since the light reflected by the side reflector 42 and the bottom reflector 44 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, the illuminated state can be easily seen 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 can be improved by illuminating the display unit 22 during installation or maintenance of the fire detector 10, making it easy to see the type of fire detector 10. In particular, when the fire detector 10 is installed in a dark place, the illumination of the identification label unit 50 can make the work easier.

[0027] Furthermore, the identification label unit 50 has a luminous section 52 that stores light when exposed to light from the display section 22, and so can continue to glow for a while even after the light from the display section 22 has gone out. This allows the identification label unit 50 to be more reliably seen, further improving workability, for example, when the fire detector 10 is installed in a dark place.

[0028] Although the embodiment of the present invention has been described above, the application of the present invention is not limited to this embodiment, and various applications are possible within the scope of the technical concept thereof.

[0029] Although the fire detector 10 in the above-described embodiment is a small, built-in type, the present invention can also be applied to other types of fire detectors. For example, the present invention can also be applied to a surface-mounted fire detector that is fixed to an installation surface via a mounting base. Furthermore, although the fire detector 10 in the above-described embodiment detects fires by detecting heat, the fire detector may also 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 31 rising from the main body 30. A reflective portion may also be provided on the surface of the central guard portion 34 that constitutes the guard portion, facing the main body 30. The position and number of the display unit 22 in the main body 30 can also be set arbitrarily, and the 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 casing 32, a bottom surface 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 surface 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] Furthermore, in the above-described embodiment, each reflective portion is provided on a sticker attached 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 reflecting 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, outer shell portion 32, guard support portion 33, and central guard portion 34, may be formed from a transparent material so as to transmit light from the light-emitting portion inside the main body portion 30, thereby making the front side of the fire detector 10 illuminate.

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

[0035] 10 Fire detector 20 Case 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 that is installed on an installation surface and holds the detection unit so that the detection unit is exposed on a side facing the installation surface; a non-transparent 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 the side facing the installation surface, the guard portion has an outer shell portion having an opening disposed on a side farther from the installation surface than the front portion, a plurality of guard support portions in the circumferential direction rising from the outer shell portion and extending toward the center, and a central guard portion supported by the guard support portions and positioned on a side farther from the installation surface than the tip of the detection portion to cover the detection portion, When the light display is on, the light from the light-emitting unit can be indirectly seen through the area of ​​the opening that is not covered by the guard support part and the central guard part by looking at the center part of the front part centered on the detection unit from a position away from the outer casing part on the side opposite the installation surface.

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