JP2014199632A - Heat sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sensor that is difficult to block the heat coming into a heat sensing unit.SOLUTION: The heat sensor X includes: a sensor body 10 fixed to an installation surface; a heat sensing unit 20 that is erected so as to project from an opening disposed in the sensor body 10 and senses the heat in a monitoring area; and a protection unit 30 for covering and protecting the heat sensing unit 20. A connection member 40 for interconnecting the sensor body 10 and protection unit 30 is disposed so as to obliquely overlie a part of the heat sensing unit 20 in the side view of the sensor body 10.

Description

  The present invention provides a sensor main body fixed to an installation surface, a heat sensing unit that stands up from an opening provided in the sensor main body and senses heat in a monitoring area, and the heat sensing unit. The present invention relates to a heat sensor including a protection unit that covers and protects the heat sensor.

  2. Description of the Related Art Conventionally, there has been known a heat sensor that detects the occurrence of a fire by using a change in electrical characteristics due to heat of a heat sensing element such as a thermistor. The thermistor, which is a heat sensing unit, is arranged upright so as to protrude from an opening provided on one side of the sensor body, for example.

  In this way, the thermistor is erected so as to protrude from the opening, by separating the thermistor from the sensor body as much as possible to prevent heat conduction with the sensor body and from the outside of the sensor body. This is because the thermal responsiveness of the thermistor is enhanced by applying the airflow directly to the thermistor as much as possible. Further, in order to protect the thermistor erected in this way from an external impact or the like, a protection portion that covers and protects the thermistor is provided.

  In addition, since such a heat sensor is a general technique, a prior art is not shown.

  The protection unit that covers and protects the thermistor is connected to the sensor body by a plurality of connection members. The connection member is a columnar member that is erected substantially perpendicular to the sensor body. Therefore, in the side view of the sensor main body, the thermistor 20 ′ and the connecting member 40 ′ standing so as to protrude from the opening portion overlap each other depending on the angle (FIGS. 6 and 7A). At this angle, the thermistor may be completely hidden by the connecting member, and the connecting member blocks the heat directly incident on the thermistor from the heat source. For this reason, when heat is incident from an angle at which the thermistor and the connecting member overlap, heat is less likely to be detected than when heat is incident from an angle at which the thermistor and the connecting member do not overlap, and the timing for issuing an alarm to notify the fire There was a risk of delay.

  Accordingly, an object of the present invention is to provide a heat detector that is difficult to block the heat incident on the heat sensing unit.

  In order to achieve the above object, a heat sensor according to the present invention is provided such that a sensor main body fixed to an installation surface and a sensor body standing upright so as to protrude from an opening provided in the sensor main body, and heat in a monitoring region. A heat sensor comprising a heat sensing part for sensing and a protection part for covering and protecting the heat sensing part, the first feature of which is a connection member connecting the sensor body and the protection part However, in the side view of the sensor main body, the sensor body is disposed so as to be obliquely overlapped with a part of the heat sensing unit.

  According to this configuration, in the side view of the sensor main body, the heat sensing unit and the connection member are only partially overlapped depending on the angle, and the heat sensing unit is not completely hidden by the connection member. That is, in the side view of the sensor main body, even if the heat sensing part and the connection member partially overlap, it is possible to receive the directly incident heat at the part of the heat sensing part that does not overlap the connection member. Therefore, if it is the heat sensor of this invention, it will become difficult to interrupt the heat which injects into a heat sensing part.

It is the schematic which shows the heat sensor of this invention ((a) top view (b) side view). It is a perspective view of the heat sensor of the present invention. It is a principal part schematic of the side view of the heat sensor of this invention. It is the schematic which shows the other Example of a connection member. It is the figure which showed the angle of the heat | fever which flows in into a heat sensor from a heat source. It is the schematic of the conventional heat sensor. It is the principal part schematic of the conventional heat sensor by the side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The heat sensor of the present invention detects abnormal heat generation in a monitoring area such as a fire. As shown in FIGS. 1 to 3, the heat sensor X of the present invention is erected so as to protrude from the sensor body 10 fixed to the installation surface and the opening 11 provided in the sensor body 10, A heat sensor X including a heat sensing unit 20 that senses heat in a monitoring region and a protection unit 30 that covers and protects the heat sensing unit 20, and connects the sensor body 10 and the protection unit 30. The member 40 is disposed so as to be obliquely overlapped with a part of the heat sensing unit 20 in a side view of the sensor body 10.

  The sensor body 10 may be made of a material having excellent heat resistance, for example. Examples of such materials include, but are not limited to, heat resistant resins and metals. The sensor body 10 may be formed into a known shape such as a columnar shape, a disk shape, or a rectangular parallelepiped. In the present embodiment, a case will be described in which the sensor body 10 is a disk (diameter 120 mm, thickness 23.8 mm).

  The sensor body 10 has a housing space for housing a power supply unit, a circuit board, a notification means (not shown), and the like, and an opening 11 is formed at the center thereof.

  The power supply unit may have any form as long as it can supply power to the circuit board. For example, a button-type lithium ion battery can be used.

  For example, when the heat detection unit 20 or a detection unit described later continuously detects heat, CO concentration, and city gas concentration at or above the alarm level, the notification unit issues an alarm by blinking a lamp or sound. In the present embodiment, a lamp display unit 13 that visually notifies an alarm is provided, and a speaker sound emitting unit 14 that emits the sound of a speaker that emits an alarm sound is provided. The speaker sound emitting unit 14 is configured by three slits in the present embodiment. The slit is formed on the lower surface side of the sensor body 10 and is not formed on the side surface side of the sensor body 10. If the slit of the speaker sound emitting unit 14 is formed on the side surface of the sensor body 10, external heat easily enters the sensor body 10, which may affect the heat detection of the heat sensor 20. .

  An attachment portion (not shown) that can be attached to an attachment object such as a wall or a ceiling is formed on the outer surface of the sensor body 10. For the attachment part, for example, a well-known attachment means such as an aspect in which the heat detection device X is attached to an attachment object by an adhesive force, an aspect in which the heat detection apparatus X is attached by magnetic force, an aspect in which the heat detection apparatus X is attached by fitting between irregularities can be applied. .

The heat sensing unit 20 includes a sensor unit that senses heat in the monitoring area and converts the sensed state into another state change. The sensor unit may be a thermistor whose resistance value changes according to the temperature, a bimetal that deforms in a predetermined direction according to the temperature, but is not limited thereto.
When the thermistor 20 is a thermistor, the approximate spherical part at the tip of the thermistor is the main sensitive part (material whose electrical resistance changes due to heat, such as metal oxide), and the other parts are the metal lead wire and its covering Part (resin etc.).
The covering portion may be further covered with a protective member, but may be an embodiment without a protective member. When the protective member is not provided, heat can be sensed at an early stage in order to cause a change in resistance value of the sensitive part even by heat conduction from the covering part.

  The heat sensing unit 20 is erected so as to protrude from an opening 11 formed at the center of the sensor body 10. The heat sensing unit 20 is covered with a protection unit 30 and is mechanically protected.

  The heat detector X may include a CO sensor and a city gas sensor as detection means in addition to the heat detection unit 20. If the CO sensor can detect carbon monoxide gas generated by incomplete combustion, and the city gas sensor can detect leakage gas such as hydrocarbon gas, a known semiconductor type sensor element or catalytic combustion type gas sensor element Etc. can be used. These sensors may be arranged so as to detect carbon monoxide gas and city gas flowing into the heat sensor X through a plurality of slits 12 formed in the sensor body 10.

  The shape of the protection unit 30 is not particularly limited as long as the protection unit 30 can cover and protect the heat sensing unit 20. The case where the protection unit 30 of the present embodiment is a disk-shaped (diameter 60 mm) member that covers the heat sensing unit 20 will be described. The disk-shaped protection part 30 has a hole 31 formed in the center thereof, and is configured to detect heat from below when the heat sensor X is attached to the ceiling.

  In the heat sensor X of the present invention, the connection member 40 that connects the sensor main body 10 and the protection unit 30 is disposed so as to be obliquely overlapped with a part of the heat detection unit 20 in a side view of the sensor main body 10. (FIG. 3C).

  The connection member 40 may be either linear or curved as long as it can be disposed so as to be obliquely overlapped with the heat sensing unit 20 in a side view of the sensor body 10. When the connecting member 40 has a curved shape, the degree of bending is not limited, and the connecting member 40 may have a slightly curved shape (FIGS. 1 to 3) or a greatly curved shape (FIG. 4). The connecting member 40 may be curved in any direction, for example, may be curved toward the heat sensing unit 20 (FIGS. 1 to 3), or may be curved along the circumferential direction of the opening 11 (FIG. 4). ). In the present embodiment, a plurality of connection members 40 are provided along the opening 11 so as to surround the heat sensing unit 20, but the connection member 40 is not limited to such a mode and is arranged so as to surround the opening 11. Just set up. 1 to 3 show a case where four linear connection members 40 are connected to each other at a connection portion 41 to form four V-shaped members. By forming the two linear connection members 40 in a V shape as shown in FIG. 3, the strength is improved as compared with, for example, an inverted V shape.

  In the present embodiment, the thickness of the heat sensor X having the sensor body 10, the protection unit 30, and the connection member 40 is 34 mm. The size of the heat sensing portion (thermistor) 20 is such that the diameter of the substantially spherical portion at the tip is 2 mm and the metal lead wire is 1 mm. The width of the connecting member 40 is 1.2 mm.

  In this case, in the side view of the sensor body 10, the heat sensing unit 20 and the connection member 40 only overlap with each other depending on the angle, and the heat sensing unit 20 is not completely hidden by the connection member 40. That is, in the side view of the sensor main body 10, even if the heat sensing unit 20 and the connection member 40 partially overlap, it can receive the directly incident heat at the part of the heat sensing unit 20 that does not overlap the connection member 40. . Therefore, with the heat sensor X of the present invention, it is difficult to block the heat incident on the heat sensing unit 20.

  As described above, the heat sensor X can be attached to an attachment object such as a wall or a ceiling. When the heat detector X is attached to the wall, the shape of the opening 11 can be rectangular or elliptical.

[Example 1]
Using the heat sensor X of the present invention and the conventional heat sensor X ′, it was examined how the time required to issue a fire alarm varies depending on the angle at which heat flows from the heat source.

FIG. 5 shows the angle of heat flowing from the heat source into the heat sensor X.
In the heat detector X of the present invention, the reference of the inflow angle (0 degree) was set to a position where the connection part 41 connecting the one ends of the two connection members 40 and the heat detection unit 20 overlap. Further, in the conventional heat sensor X ′, the reference (0 degree) of the inflow angle is a position where the connection member 40 ′ and the heat sensing unit 20 ′ overlap.

  The inflow angle was 0, 10, 45, 70, 90, 100, 135, 160, and 180 degrees. 3A shows 0, 90, 180 degrees, FIG. 3B shows 45, 135 degrees, FIG. 3C shows 10, 100 degrees, and FIG. 3D shows 70, 160 degrees. Each is shown. 7A shows 0, 45, 90, 135, and 180 degrees, FIG. 7B shows 10, 100 degrees, and FIG. 7C shows 70 and 60 degrees, respectively.

  In the conventional heat sensor X ′, as shown in FIG. 7A, when the inflow angle is 0, 45, 90, 135, and 180 degrees, the heat sensing unit 20 ′ and the connecting member 40 ′ are overlapped, The sensing unit 20 ′ is completely hidden by the connecting member 40 ′. On the other hand, in the heat sensor X of the present invention, the heat sensor 20 is not completely hidden by the connecting member 40 at any angle (FIG. 3).

  The test conditions are supplementary provisions of the detailed rules for appraisal of disaster prevention equipment for homes, etc. stipulated by the Japan Fire Service Certification Association (NSK). It was conducted based on the operation test, and when it was put into a vertical air flow of 81.25 degrees and a wind speed of 1 meter per second, the time for issuing a fire alarm was measured. The results are shown in Table 1.

  As a result, in the conventional heat sensor X ′, when the inflow angle (0, 45, 90, 135, 180 degrees) where the heat sensing unit 20 ′ and the connecting member 40 ′ overlap each other, the fire alarm time is 30 seconds or more. However, when the inflow angle (10, 70, 100, 160 degrees) at which the heat sensing unit 20 ′ and the connecting member 40 ′ do not overlap each other, the time for issuing the fire alarm was about 12 to 13 seconds. When the heat sensing unit 20 ′ and the connection member 40 ′ have such an inflow angle that overlaps, the connection member blocks heat directly incident on the heat sensing unit 20 ′ from the heat source. It took about 2.4 to 3.2 times as long as the inflow angle where the members 40 'did not overlap.

  On the other hand, in the heat detector X of the present invention, the time for issuing the fire alarm was about 10 to 19 seconds. Therefore, the heat sensor X of the present invention can eliminate the aspect that requires a lot of time for fire alarm (20 seconds or more) like the conventional heat sensor X 'according to the inflow angle of heat. That is, in the heat sensor X of the present invention, when the sensor body 10 is viewed from the side, the heat sensor 20 and the connection member 40 only overlap with each other depending on the angle. Therefore, it is difficult to block the heat incident on the heat sensing unit 20.

  The heat sensor according to the present invention includes a sensor body fixed to an installation surface, a heat sensor that stands up to protrude from an opening provided in the sensor body and senses heat in a monitoring area, and The present invention can be applied to a heat sensor including a protection unit that covers and protects the heat detection unit.

X heat sensor 10 sensor body 11 opening 20 heat sensor 30 protector 40 connecting member

Claims (1)

A sensor body fixed to the installation surface;
A heat sensing unit that stands up from an opening provided in the sensor body and senses heat in the monitoring area;
A heat detector that covers and protects the heat sensor,
A heat sensor in which a connecting member for connecting the sensor body and the protection unit is disposed so as to be obliquely overlapped with a part of the heat sensor part in a side view of the sensor body.

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