thermal sensor

Abstract

To provide an embedded heat detector capable of improving aesthetics.SOLUTION: In an embedded heat detector 1, a protector 4 has a plurality of strut sections 4b, which is vertically erected at a front part of a guard 3 toward the front side to protect a heat-sensitive element from a side, and a top plate section 4a, which is provided at a tip 4ba of the plurality of strut sections 4b to protect the heat-sensitive element from the front side. All of the plurality of strut sections 4b are located within a vertical projection area of the top plate section 4a for the entire length of the length direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heat detector used as a fire detector. [Background technology]

[0002] Heat detectors are used as fire detectors that detect heat and are attached to the ceiling or walls of buildings to protect them from fires.

[0003] In this type of heat detector, when the heat-sensitive element is exposed from the front of the main body, a protector is provided on the front side of the main body to protect the heat-sensitive element from external forces. There are various protector structures, including one that has multiple support parts that protect the heat-sensitive element from the sides and a top plate part that is provided at the tip of the multiple support parts and protects the heat-sensitive element from the front (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-159866 Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of a protector having multiple support posts as described above, gaps are provided between the support posts, and these gaps ensure the inflow of hot air toward the thermal element inside. However, on the other hand, there is a problem in that the support posts with gaps are visible, which spoils the aesthetic appearance. In particular, in the case of a built-in heat detector that is installed by embedding it in a ceiling or wall with only the front part of the main body where the protector is installed exposed, the support posts with gaps become conspicuous, further spoiling the aesthetic appearance.

[0006] SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to improve the aesthetic appearance of an embedded heat detector. [Means for solving the problem]

[0007] This invention is an embedded type heat detector comprising a main body, a flat flange provided on the front side of the main body, and a protector provided directly on the front side of the flange to protect a heat-sensitive element, the main body being embedded in a ceiling, wall, etc. with only the front side portion including the protector forward from the flange exposed, the heat-sensitive element being a lead-type thermistor provided upright facing forward on a circuit board housed inside the main body, with the tip end portion where the heat-sensitive element is located exposed forward from the main body via the flange, and the protector is attached to the front of the flange. thermistor from the front end of the thermal expansion module; a top plate portion provided at the front ends of the plurality of support portions and protecting the front end portion of the thermistor from the front; and each of the plurality of support portions is located within a vertical projection area of ​​the top plate portion over its entire length, and an angle θ formed by an imaginary line extending from the base ends of the plurality of support portions toward the top plate portion along the axial direction and an imaginary line extending from the base ends of the plurality of support portions toward the top plate portion and passing through the outer circumferential edge of the top plate portion is 10 to 50 degrees. The width and height of the main body are approximately equal in length, and the width of the top plate is approximately equal to or longer than the width of the main body. This is a heat detector characterized by the following.

[0008] In this invention, Angle θ is 15 to 45 degrees It can be said that: [Effects of the Invention]

[0010] According to this invention, for example, when a heat detector is mounted on a ceiling or the like, the support posts can be hidden by the top plate from the view of people below. Therefore, even if the support posts with gaps in the protector are originally mounted in a recessed type that is conspicuous, the support posts can be made less visible and less conspicuous, making the aesthetic appearance less likely to be perceived as poor. In other words, the aesthetic appearance of the recessed type heat detector can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] This figure shows an example of an embodiment of a heat detector of the present invention, and is a side view of the entire heat detector when the angle θ is 15 degrees. The ceiling side portion is shown with a dashed line, which also shows the positional relationship with the ceiling side portion when it is attached to the ceiling. [Figure 2] 1 in the case where the angle θ is 45 degrees. [Figure 3] 2 is a bottom view (front side of the detector) of the heat detector of FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

[0013] Here, the terms "front" and "rear" used to describe this invention, which indicate orientation and position, are used in accordance with the orientation and position of each component relative to the space to be protected, such as inside a building, when installed. Specifically, for example, the side of each component that faces the space to be protected when installed is used as the "front," and the opposite side is used as the "rear."

[0014] [Basic configuration] 1 and 2, the heat detector 1 includes a housing 2 (an example of a main body), a flange 3 provided on the front side of the housing 2, and a protector 4 provided on the front side of the flange 3. A circuit board (not shown) is housed inside the housing 2. A heat-sensing element, for example, a lead-type thermistor 6 (see FIG. 3), is attached to and fixed on the circuit board so that it stands upright toward the front and the tip end of the heat-sensing element is exposed forward from the housing 2 via the flange 3.

[0015] [Installation method (embedded)] The heat detector 1 is a recessed type and is mounted by embedding it into a ceiling, wall, or the like. Figures 1 and 2 also show the positional relationship with the ceiling T side when the detector is mounted on the ceiling T. As shown in the figures, for example, the housing 2, which is the main body, is mounted on the ceiling T by embedding it from bottom to top into a mounting hole H (dashed line) provided in the ceiling T (dashed line), with only the front portion including the protector 4 forward of the flange 3 exposed to the space to be protected. While a detailed explanation will be omitted, in the illustrated example, the mounting state in the mounting hole H is maintained by the elastic force of a mounting spring 7 (see Figure 3) provided on the side of the main body 2. For convenience, the mounting spring 7 is shown in the figures as being in a substantially free state, not an attached state.

[0016] [Protector] The protector 4 has a structure that protects the thermistor 6 from external forces while ensuring the inflow of hot air toward the thermistor 6 (see FIG. 3) located inside, specifically, on the inner periphery of the support pillars 4b. Specifically, the protector 4 has a plurality of support pillars 4b that stand upright toward the front of the flange 3 and are arranged at predetermined intervals (gaps 4bc, described below) around the thermistor 6 to protect the thermistor 6 located inside from the sides, and a flat top plate 4a that is provided at the tip ends 4ba of the plurality of support pillars 4b to protect the thermistor 6 located inside from the front. Gaps 4bc are provided between the plurality of support pillars 4b, which function as inflow ports for the hot air toward the thermistor 6 inside, and a through-hole 4aa (see FIG. 3) is also provided in the center of the top plate 4a, which penetrates toward the thermistor 6 and functions as an inflow port for the hot air toward the thermistor 6 inside. The gap 4bc and the through hole 4aa ensure that hot air can flow into the thermistor 6.

[0017] In the protector 4, each of the plurality of support columns 4b is provided so as to be positioned within the range of the vertical projection area of ​​the top plate 4a (inside the outer peripheral edge 4ab of the top plate 4a) over the entire length. That is, as shown in Fig. 3, when facing the front side of the heat detector 1, each of the plurality of support columns 4b is provided so as to be completely hidden by the top plate 4a.

[0018] As a result, in the case of heat detector 1, when heat detector 1 is mounted facing downward above the space to be protected, for example when mounted on ceiling T, the multiple support posts 4b can be hidden by top plate 4a from the line of sight of a person standing below the mounted heat detector 1. Therefore, even if the multiple support posts 4b are of a recessed type that would normally be mounted conspicuously, the support posts 4b can be made less visible and less conspicuous, making the aesthetic appearance less likely to be perceived as poor. In other words, the aesthetic appearance can be improved.

[0019] Here, the dimensions of each part of the protector 4 will be explained. The height (length) of the support pillars 4b is preferably set to a length that ensures the inflow of hot air without spoiling the aesthetic appearance. For example, it can be set to a length shorter than the height of the housing 2. The thickness of the top plate 4a can be set to be approximately the same as the thickness of the support pillars 4b or thinner than the thickness of the flange 3. Furthermore, the outer diameter of the top plate 4a can be set to be approximately the same as or shorter than the outer diameter of the housing 2, or approximately half the width of the outer shape of the flange 3.

[0020] Positional relationship between the base end of the support and the outer edge of the top plate (angle θ) The extent to which the support columns 4b can be hidden by the top plate 4a is determined by the relationship between the height (length) of the support columns 4b and the size (outer diameter) of the front surface of the top plate 4a. This relationship can be expressed as the angle θ between an imaginary line L1 extending axially from the base ends 4bb of the support columns 4b to the top plate 4a and an imaginary line L2 extending from the base ends 4bb of the support columns 4b toward the top plate 4a and passing through the outer peripheral edge 4ab of the top plate 4a.

[0021] Even when the angle θ is set to 0 degrees, the top plate 4a can obscure the line of sight of a person directly below the heat detector 1. However, the range of obscured lines of sight is narrowed. Increasing the angle θ can widen the range of obscured lines of sight. The angle θ can be increased by shortening the length of the support columns 4b, but a certain length is required to ensure good inflow of hot airflow through the gaps 4bc between the support columns 4b. The angle θ can be increased by increasing the outer diameter of the top plate 4a without shortening the length of the support columns 4b. In other words, the angle θ can be increased while ensuring good inflow of hot airflow. However, if the angle θ is set too large, the outer diameter of the top plate 4a will become too large, which will adversely affect the aesthetic appearance. Therefore, it is considered preferable to set the angle θ to an appropriate angle, for example, between 10 and 50 degrees or between 15 and 45 degrees. Figure 1 shows the case where the angle θ is set to 15 degrees. FIG. 2 shows a case where the outer diameter of the top plate portion 4a is increased and the angle θ is set to 45 degrees.

[0022] In the illustrated example, the plurality of support columns 4b stand vertically in front of the flange 3, but they may also stand at an angle. Additionally, the top plate 4a is circular in plan view (see FIG. 3), but may have other shapes, such as a polygonal shape in plan view.

[0023] [Small size and thin design (without cover)] More specifically, in the illustrated example of heat detector 1, flange 3 has a flat plate-like shape, and protector 4 is provided directly on the front side of flange 3, with no cover covering the front side of flange 3 between flange 3 and protector 4. This allows the front portion exposed from the ceiling T or wall to be made smaller and thinner. In this case, the area occupied by the multiple support columns 4b is larger than the entire exposed front portion, so the multiple support columns 4b would normally be more noticeable. However, as described above, in heat detector 1, the top plate 4a can obscure the multiple support columns 4b, making them less noticeable and less aesthetically pleasing. In other words, in the illustrated example, not only can the aesthetic appearance of heat detector 1 be improved, but it can also be made smaller and thinner.

[0024] In the illustrated example, the flange portion 3 is also circular in plan view, but like the top plate portion 4a, it may be polygonal in plan view or have other shapes.

[0025] [Configuration change example] The above describes an embodiment of the present invention with reference to the drawings, taking as an example a case where the present invention is applied to a heat detector. However, the specific configuration is not limited to the above embodiment, and also includes designs within the scope that do not deviate from the gist of the present invention. [Explanation of symbols]

[0026] 1: Heat detector 2: Housing (main body) 3: Flange 4: Protector 4a: Top plate 4aa: Through hole 4ab: Outer periphery 4b: Support part 4ba: Tip part 4bb: Base part 4bc: Gap 6: Thermistor 7: Mounting spring T: Ceiling H: Mounting hole

Claims

[Claim 1] A built-in heat detector includes a main body, a flat flange provided on the front side of the main body, and a protector provided directly on the front side of the flange to protect a heat-sensitive element, and the main body is embedded in a ceiling, wall, or the like with only the front side portion including the protector forward of the flange exposed, the heat-sensitive element is a lead-type thermistor that is provided upright toward the front on a circuit board housed inside the main body, and a tip end portion where a heat-sensitive portion is located is exposed forward from the main body via the flange portion, the protector has a plurality of support columns provided on the front side of the flange portion and standing upright toward the front to protect the tip end portion of the thermistor from the sides, and a top plate portion provided on the tip end portions of the plurality of support columns and protecting the tip end portion of the thermistor from the front, each of the plurality of support columns being located within a vertical projection area of ​​the top plate portion over its entire length, and an angle θ formed by an imaginary line extending from the base ends of the plurality of support columns toward the top plate portion along the axial direction and an imaginary line extending from the base ends of the plurality of support columns toward the top plate portion and passing through the outer circumferential edge of the top plate portion is 10 to 50 degrees, The main body has a length that is approximately equal to its width and height, A heat detector characterized in that the width of the top plate is approximately equal to or longer than the width of the main body.

Images