Fire detector

Abstract

To provide a fire detector that can improve the visibility of the display unit. [Solution] The fire detector comprises a detection unit 21 for detecting heat, a main body 30 installed on an installation surface and holding the detection unit 21 with the detection unit 21 exposed on the side facing the installation surface, and a display mechanism including a light-emitting unit that displays information using light from the light-emitting unit. The main body 30 has a front portion 30b that is exposed facing the side facing the installation surface, and a recess 40 is formed in the center of the front portion 30b that is recessed inward from the main body 30b. The recess 40 has a bottom portion 43 located on the installation surface side in the height direction when installed, and a side portion 41 that rises from the periphery of the bottom portion 43 in the direction away from the installation surface in the height direction when installed, surrounding the bottom portion 43. A display unit 22 is arranged in the recess 40, extending from the bottom portion 43 in the height direction when installed, and the display unit 22 has a height greater than the depth of the recess 40.

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 Art

[0002] A fire detector that detects the occurrence of a fire is fixed to an installation surface such as a ceiling surface of a building. Examples of the fire detector include a fire detector having a heat detection unit that detects heat due to a fire. In addition to this, a fire detector that detects smoke, a fire detector that detects gas, or a fire detector that combines these functions is known.

[0003] The fire detector may be provided with a display unit that optically indicates an operating state such as a fire alarm. As the light emitting unit that constitutes the display unit of the fire detector, for example, a light emitting diode (LED) or the like is used. The light emitting unit is provided inside the main body of the fire detector and is guided to the outside by a light guide or the like. Examples of such a fire detector include those described in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The fire detector of Patent Document 1 is a sealed type, and by providing a light guide portion that extends over substantially the entire housing, light can be visually recognized from a wide range. However, there are also fire detectors in which it is difficult to provide a light guide portion that extends over the entire housing, such as a fire detector in which a thermistor is exposed. Even in such a case, a fire detector in which the light of the display unit is easily visible is desired.

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

[0007] To solve the aforementioned problems, the fire detector according to the present invention comprises a detection unit for detecting heat, a main body unit installed on an installation surface and holding the detection unit with the detection unit exposed on the side facing the installation surface, and a display mechanism including a light-emitting unit that displays information using light from the light-emitting unit. The main body unit has a front surface that is exposed toward the side facing the installation surface, and a recess is formed in the center of the front surface unit that is recessed toward the interior side of the main body unit. The recess has a bottom surface unit located toward the installation surface in the height direction when installed, and a side surface unit that rises from the periphery of the bottom surface unit toward the installation surface in the height direction when installed, surrounding the bottom surface unit. A display unit is arranged in the recess, extending from the bottom surface unit toward the height direction when installed, and the display unit has a height greater than the depth of the recess. [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 drawing]

[0009] [Figure 1] This is a perspective view of the fire detector in this embodiment, as seen from the front. [Figure 2] This is a front view of a fire detector. [Figure 3] This is a cross-sectional view of section AA in Figure 2, specifically the section closer to the front than the front section. [Figure 4] This is a front view of a fire detector showing the parts that light up due to the reflector when the display unit is illuminated. [Figure 5] This is a cross-sectional view illustrating a different form of display unit. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail with reference to the drawings. The fire detector 10 of this embodiment is fixed to an installation surface such as the ceiling of a building and detects heat generated by a fire. Figure 1 shows a perspective view of the fire detector 10 of this embodiment as seen from the front, and Figure 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 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 circuit board and other components arranged for detecting a fire and transmitting a fire detection signal. The main body 30 has a roughly cylindrical rear portion 30a and a roughly disc-shaped front portion 30b with a larger diameter than the rear portion 30a. When the housing 20 is fixed to the installation surface, the rear portion 30a is embedded 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. However, the housing 20 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 made up of a thermistor and can detect heat at its tip.

[0014] The main body 30 is provided with a guard section to protect the heat detection section 21. The guard section has side column sections 31 that rise in the height direction from the front section 30b, an outer casing section 32 supported by the side column sections 31, a guard support section 33 that extends from the outer casing section 32 toward the center, and a central guard section 34 supported by the guard support section 33.

[0015] Multiple side column sections 31 are formed in the circumferential direction and are arranged at equal intervals in the circumferential direction. The side column sections 31 support the outer casing section 32 at their tops. The outer casing section 32 has a ring shape with a certain width and is positioned apart from the main body section 30 in the height direction.

[0016] Three arm-shaped guard support portions 33 are provided at three circumferential locations on the outer casing portion 32, rising from the outer casing portion 32 and extending toward the center. The guard support portions 33 support the central guard portion 34 at the center. The central guard portion 34 has a small diameter and annular shape. The heat detection portion 21 is located in the center of the main body portion 30, and since its tip is positioned lower than the central guard portion 34, it is covered by the central guard portion 34.

[0017] The main body 30 has two display units 22 located on the outer periphery of the central guard unit 34. The two display units 22 are positioned at the 3 o'clock and 9 o'clock positions in the circumferential direction in Figure 2. A light-emitting unit (not shown) made of LEDs is provided inside the main body 30, and the display units 22 are light guides that guide the light from this light-emitting unit to the outside. The display units 22 can light up when the light-emitting unit emits light.

[0018] The front surface 30b of the main body 30 has an identification label section 50 on the outer surface side of the recess 40, at the 3 o'clock position in the circumferential direction in Figure 2. The identification label section 50 is formed of a sticker or the like that can be attached to the main body 30. The identification label section 50 has a mark printed on it that corresponds to the type of fire detector 10. Fire detectors are classified into several types according to the fire detection method, such as differential spot type and fixed temperature spot type that detect heat, and photoelectric spot type and photoelectric separated type that detect smoke. Fire detectors are also classified into different types according to their functions, such as the presence or absence of a test function, or the sensitivity of fire detection. The mark on the identification label section 50 has a different design for each of these types. The fire detector 10 in this embodiment is a differential spot type and is classified as a type with a test function, so it is marked with a mark corresponding to this type. By attaching such a unique mark according to the type to the fire detector, the type of fire detector can be easily identified during installation and maintenance, allowing work to be carried out quickly and reliably.

[0019] FIG. 3 shows a cross-sectional view of the A-A cross-section of FIG. 2 on the front side of the front portion 30b. As shown in this figure, a concave portion 40 is formed in the central portion of the front portion 30b. The concave portion 40 has a bottom surface portion 43 facing in the height direction and side surface portions 41 rising from the bottom surface portion 43. The two display portions 22 are arranged in the concave portion 40. Further, the display portion 22 has a height greater than the depth of the concave portion 40 and protrudes slightly in the height direction from the concave portion 40.

[0020] A side surface reflection portion 42 is provided on the side surface portion 41 of the concave portion 40. The side surface reflection portion 42 is formed of a thin film-like seal or the like having a reflective material that reflects light. As shown in FIG. 2, the side surface reflection portion 42 is provided over a portion of the side surface portion 41 that faces the display portion 22 and the region in the vicinity thereof.

[0021] As shown in FIG. 3, a counter surface reflection portion 36 is provided on the counter surface portion 35, which is the surface of the outer peripheral portion 32 constituting the guard portion that faces the main body portion 30. Further, a bottom surface reflection portion 44 is provided on the bottom surface portion 43 of the concave portion 40 that faces the counter surface reflection portion 36. The bottom surface reflection portion 36 is arranged inside a circular region centered on the exposed location of the main body portion 30 of the heat detection portion 21 and having a radius from this central position to the display portion 22. The counter surface reflection portion 36 and the bottom surface reflection portion 44 can be formed of a thin film-like seal or the like having a reflective material that reflects light, similar to the side surface reflection portion 42.

[0022] The above-described identification label portion 50 provided on the main body portion 30 has a reflection portion 51 that reflects light. The reflection portion 51 is formed by providing a reflective material on the identification label portion's 50. Further, the identification label portion 50 also has a phosphorescent portion 52. The phosphorescent portion 52 is formed by applying or including a phosphorescent paint or the like on the identification label portion 50.

[0023] Of the light emitted from the display unit 22, the light directed toward the side portion 41 is reflected by the side reflector 42, as shown by the light ray L1 in Figure 3, allowing it to travel at an angle in the height and horizontal directions of the main body 30. In addition, of the light emitted from the display unit 22, the light directed toward the outer casing 32 is reflected by the opposing surface reflector 36 of the outer casing 32, as shown by the light ray L2 in Figure 3, and further reflected by the bottom reflector 44 provided on the bottom portion 43 of the main body 30, allowing it to travel at an angle in the height and horizontal directions of the main body 30.

[0024] Of the light emitted 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, as shown by the light ray L3 in Figure 3, and is reflected by the reflector 51 of the identification label unit 50. This allows the light emitted from the display unit 22 to illuminate the identification label unit 50.

[0025] Figure 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 parts of the side 41 where the side reflectors 42 are provided, the parts of the bottom 43 where the bottom reflectors 44 are provided, and the identification label 50 are illuminated by reflected light. The light reflected by the side reflectors 42 and the bottom reflectors 44 also travels at an angle horizontally along the main body 30, so when the fire detector 10 is installed on the ceiling of a building, it can be easily seen illuminating the fire detector 10 from diagonally below. Therefore, the display from the display unit 22 can be seen from a wide range of angles.

[0026] Furthermore, since the identification label section 50 illuminates with light from the display section 22, the display section 22 is illuminated when the fire detector 10 is installed or maintained, improving the visibility of the identification label section 50 and making it easy to identify 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 section 50 makes the work easier.

[0027] Furthermore, since the identification label section 50 has a phosphorescent section 52 that stores light when it receives light from the display section 22, it can continue to glow for a while even after the light from the display section 22 has gone out. This makes the identification label section 50 more visible and improves work efficiency, especially when the fire detector 10 is installed in a dark place.

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

[0029] The fire detector 10 in the above-described embodiment is a small, embedded type, but the present invention can also be applied to other types of fire detectors. For example, the present invention can also be applied to exposed-type fire detectors that are fixed to the installation surface via a mounting base. Furthermore, while the fire detector 10 in the above-described embodiment detects fire by detecting heat, it may also be a fire detector that detects smoke or gas, or a combination thereof, and is not limited to any particular type.

[0030] Furthermore, in the main body 30, the reflective portion can be arbitrarily positioned in any location other than the above-described embodiment, as long as it can reflect light from the display unit 22. For example, a reflective portion may be provided on the side column portion 31 that rises from the main body 30. Alternatively, a reflective portion may be provided on the surface of the central guard portion 34 that constitutes the guard portion, facing the main body 30. In addition, the position and number of the display unit 22 in the main body 30 can be arbitrarily set, and accordingly, reflective portions can be provided in positions that can reflect light from the display unit 22.

[0031] Furthermore, 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 portion 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. However, only the side reflective portion 42 may be provided, or only the opposing surface reflective portion 36 and the bottom surface reflective portion 44 may be provided, or only the reflective portion 51 on the identification label portion 50 may be provided, or two of these reflective portions may be provided.

[0032] Furthermore, in the above-described embodiment, each reflective part is provided on a sticker attached to the main body 30, but the main body 30 itself may have a reflective material, or reflective parts may be provided by other methods, such as applying a paint containing a reflective material to the main body 30.

[0033] Furthermore, in the above-described embodiment, a bottom reflective portion 44 is provided on the bottom surface portion 43 of the recess 40. However, the front components of the fire detector 10, such as the side column portion 31, the outer casing portion 32, the guard support portion 33, and the central guard portion 34, may be formed from a transparent material to allow light from the light-emitting portion inside the main body portion 30 to pass through, thereby illuminating the front side of the fire detector 10.

[0034] Furthermore, in the above-described embodiment, reflected light from the display unit 22 is incident on the bottom reflective section 44 and reflected by the bottom reflective section 44. However, the light from the display unit 22 may be directly incident on the bottom reflective section 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 reflective section 42. Figure 5 shows an explanatory cross-sectional view of another embodiment of the display unit 22. As shown in this figure, by providing light guide paths with different refractive indices inside the display unit 22, the light can be directed directly toward the bottom section 43. The display unit 22 is provided with a curved bottom-side light guide section 22c as a light guide path, with both ends facing toward the light-emitting section 23 and the bottom reflective section 44, respectively. A portion of the light from the light-emitting section 23 is emitted toward the bottom section 43 by the bottom-side light guide section 22c and reflected by the bottom reflective section 44. Light is emitted directly 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 section 22a, and the side surface of the display unit 22 is the side light guide section 22b. In this way, by providing the bottom light guide section 22c that guides light toward the bottom reflector section 44, the light from the display unit 22 can be directed directly toward the bottom reflector section 44. [Explanation of Symbols]

[0035] 10 Fire detector 20 cabinets 21 Heat detection unit 22 Display section 30 Main body 30a Back part 30b Front part 31 Side column section 32 Outer shell 33 Guard support section 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 the mounting surface and holds the detection unit with the side facing the mounting surface exposed, It includes a display mechanism that includes a light-emitting part and displays information using light from the light-emitting part, The main body has a front portion that is exposed facing the side opposite to the installation surface, A recess is formed in the center of the front portion, which is recessed inward on the main body portion. The recess has a bottom portion located on the installation surface side in the height direction when installed, and a side portion that rises from the periphery of the bottom portion in a direction away from the installation surface in the height direction when installed, surrounding the bottom portion. A fire detector wherein a display unit is arranged in the recess, extending in the height direction from the bottom surface when installed, and the display unit has a height greater than the depth of the recess.

Images