JP2001006067A - Side wall-type fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side wall-type fire sensor in which the drop of response speed of a thermal sensor to the ambient temperature is avoided by preventing the adhesion of dust and oil to the thermal sensor as much as possible. SOLUTION: A side wall-type fire sensor which is used by fitting it to a side wall 6 is provided with a casing 2 incorporating sensing circuit parts and having a fitting part 2a for fitting it to the side wall 6 and a thermal sensor 3 fitted to the casing 2 so that a sensing face turns downward. Thus, the adhesion of dust to a thermistor is less and response speed to a peripheral temperature is not dropped. The adhesion of oil to the thermistor is reduced and response speed to the peripheral temperature is not easily dropped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side wall type fire detector mounted on a side wall and, more particularly, to a mounting structure of the heat sensor.

[0002]

2. Description of the Related Art A constant-temperature fire alarm (hereinafter, referred to as a fire detector), which is a type of fire sensor, detects heat generated by a fire with a heat-sensitive sensor and issues an alarm when the temperature exceeds a certain level. It is a device that emits. It is common to use a thermistor whose resistance value decreases as the temperature rises as the thermal sensor.

[0003] There are various types of such fire detectors, such as a type mounted on the ceiling of a building and a type mounted on the side wall of a building.

FIG. 5 is a schematic perspective view showing an example of a fire detector of the type used by being attached to the ceiling of a building.
The fire detector 1 includes a disc-shaped casing 2 and a thermal sensor 3 attached to the center of the casing 2. Thermal sensor 3
Is composed of a protective frame 4 and a thermistor 5. The protection frame 4 has a structure that surrounds and protects the thermistor 5 connected to a sensing circuit component (not shown) built in the housing 2, and vents the thermistor 5.

In this type of fire detector 1, as shown in FIG. 6, for example, a thermal sensor 3 is mounted on a ceiling surface 8 in a building so that the heat sensor 3 faces downward. 6 and hot air 10 flowing along the ceiling surface 8
Is sensed by the thermistor 5 of the thermal sensor 3.

FIG. 7 is a schematic perspective view showing an example of a fire detector of a type used by being attached to a side wall of a building.
The fire detector 1 includes a box-shaped housing 2, a protective frame 4 and a thermistor 5, and a heat-sensitive sensor 3 mounted on the front surface of the box-shaped housing 2. This type of fire detector 1 is attached to a side wall 6 inside a building, and detects the temperature of hot air 10 flowing at the time of a fire when the fire is detected.
It is something that senses.

[0007]

However, the above-mentioned side wall type fire detector 1 has the following problems. (1) When the fire detector 1 is attached to the side wall 6, the thermal sensor 3 protrudes in the lateral direction, and the thermistor 5 is exposed to the air through the protection frame 4, so that dust in the air is removed.
And the response speed to the ambient temperature may be degraded. (2) When the fire detector 1 is used in a kitchen or the like, the response speed to the ambient temperature may be deteriorated due to the adhesion of the oil to the thermistor 5 when exposed to oil smoke.

In view of the foregoing, an object of the present invention is to solve the above-described problems by minimizing dust and oil from adhering to the thermal sensor and reducing the response speed of the thermal sensor to ambient temperature. An object of the present invention is to provide a side wall type fire detector which can be avoided.

[0009]

SUMMARY OF THE INVENTION In view of the above-mentioned object, a side wall type fire detector according to the first aspect of the present invention is a side wall type fire detector which is used by being attached to a side wall. It is characterized by comprising a housing 2 which is built-in and has a mounting portion 2a for mounting to the side wall 6, and a thermal sensor 3 mounted on the housing 2 so that a sensing surface faces downward.

In the first aspect of the present invention, the thermal sensor 3 is attached to the housing 2 so that the sensing surface faces downward. As a result, adhesion of foreign matter to the thermistor 5
It is almost the same as the conventional ceiling type fire detector, and is less than the conventional side wall type fire detector.

According to a second aspect of the present invention, in the side wall type fire detector according to the first aspect, the external shape of the housing 2 and the thermal sensor 3 is such that the thermal sensor 3 is attached to the housing 2. , And is formed so as to be streamlined without a step.

According to the second aspect of the present invention, the external shape of the housing 2 and the thermal sensor 3 is formed so as to be streamlined without any step when the thermal sensor 3 is mounted on the housing 2. Thereby, hot air generated in the event of a fire smoothly passes through the thermistor 5.

According to a third aspect of the present invention, there is provided the side wall type fire detector according to the first aspect, wherein an air passage penetrating from the mounting surface 2b on which the thermal sensor 3 is mounted to the other surface inside the housing 2. 7 is formed.

According to the third aspect of the present invention, an air passage 7 is formed inside the housing 2 so as to penetrate from the mounting surface 2b to which the thermal sensor 3 is mounted to another surface. Thereby, a part of the hot air flowing along the wall passes through the ventilation path 7, and the hot air smoothly passes through the thermistor 5 without generating an air current vortex near the root of the mounting surface 2 b of the thermistor 5.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fire detector according to the present invention.

FIG. 1 shows an example of the structure of a side wall type fire detector according to the present invention, wherein (a) is a perspective view, (b) is a front view,
(C) is a plan view. The side wall type fire detector 1 includes a housing 2 having a mounting portion 2a on a bottom portion and a mounting surface 2b on a side portion.
And a thermal sensor 3 mounted on the mounting surface 2b of the housing 2.
Consists of The thermal sensor 3 includes a protective frame 4 and a thermistor 5.

The protective frame 4 is an integrally molded product composed of a small-diameter wheel, a large-diameter wheel, and several columns connecting the small-diameter wheel and the large-diameter wheel, and has an outer shape of a truncated cone. ing. The protective frame 4 surrounds and protects the thermistor 5 connected to a sensing circuit component (not shown) built in the housing 2 and has a structure for ventilating the thermistor 5.

The external shape of the housing 2 is the mounting surface 2b of the housing 2.
When the thermal sensor 3 is attached to the thermal sensor 3, the thermal sensor 3 is formed so as to be streamlined from the outer shape of the truncated cone toward the end opposite to the mounting surface 2 b without any step.

Next, a method of using the side wall type fire detector 1 having the above structure will be described. Side wall fire detector 1
2, as shown in FIG. 2, the mounting portion 2 a is attached to an appropriate position of the side wall 6 in the interior of the building with some fixing means (adhesive, double-sided adhesive tape, etc.) so that the thermistor 5 of the thermal sensor 3 faces downward. To use.

With this arrangement, when a fire occurs, the hot air 10 rising along the side wall 6 is sensed by the thermistor 5 of the thermal sensor 3 facing downward. When the heat of the hot air 10 exceeds a certain temperature, the resistance value of the thermistor 5 decreases, and an alarm is issued from the fire detector 1 based on the sensing information based on the reduction of the resistance value.

At this time, since the external shapes of the housing 2 and the thermal sensor 3 are formed so as to be streamlined with no steps, the housing 2 blocks the hot air 10 from flowing to the thermistor 5 and the mounting portion of the thermistor 5 There is no eddy of the airflow near the root of the hot air, and the hot air 10 flowing along the side wall 6 passes through the thermistor 5 smoothly.

As described above, when used, the side wall type fire detector 1 is in the same posture (downward) as the conventional ceiling type fire detector.
Is attached to the thermistor 5, the amount of foreign matter attached to the thermistor 5 is almost the same as that of the conventional ceiling type, but smaller than that of the conventional side wall type fire detector.

Next, FIG. 3 shows another example of the structure of the side wall type fire detector according to the present invention, wherein (a) is a perspective view, (b) is a front view, and (c) is a plan view. . Side wall fire detector 1
Comprises a box-shaped housing 2 having a mounting portion 2a on the bottom and a mounting surface 2b on the side, and a thermal sensor 3 mounted on the mounting surface 2b of the housing 2. The thermal sensor 3 includes a protective frame 4 and a thermistor 5.

The protective frame 4 is an integrally molded product composed of a small-diameter ring, a large-diameter ring, and several pillars connecting the small-diameter ring and the large-diameter ring, and has an outer shape of a truncated cone. ing. The protective frame 4 surrounds and protects the thermistor 5 connected to a sensing circuit component (not shown) built in the housing 2 and has a structure for ventilating the thermistor 5.

An air passage 7 is formed inside the housing 2 so as to pass from the mounting surface 2b on which the thermal sensor 3 is mounted to another surface. The ventilation path 7 is provided with a circular opening 7 formed in a mounting portion of the thermal sensor 3 to the housing 2, for example, a mounting surface 2 b of the housing 2 inside the protective frame 4 of the thermal sensor 3.
Two chimney-shaped ventilation passages having a circular cross-section penetrating from a at a predetermined angle to a circular opening 7b opened in the upper surface of the housing 2 and the opposing surface of the mounting surface 2b.

Next, a method of using the side wall type fire detector having the above structure will be described. The side wall type fire detector 1
As shown in FIG. 4, the mounting portion 2 a is fixed to a proper position of the side wall 6 in the interior of the building such that the thermistor 5 of the thermal sensor 3 is directed downward by some fixing means (adhesive, double-sided adhesive tape, etc.)
Attach and use.

With this mounting, in the event of a fire, the hot air 10 rising along the side wall 6 is sensed by the thermistor 5 of the thermosensor 3 facing downward. When the heat of the hot air 10 exceeds a certain temperature, the resistance value of the thermistor 5 decreases, and an alarm is issued from the fire detector 1 based on the sensing information based on the reduction of the resistance value.

At this time, the hot air 10 flowing along the side wall 6
Is a circular opening 7 formed in the mounting surface 2b of the housing 2 on which the thermal sensor 3 is mounted after passing through the thermistor 5.
From a, it passes through the ventilation path 7 and passes through the opening 7b opened on the other surface of the housing 2 in the upward direction. Therefore, the casing 2 does not block the hot air 10 from flowing into the thermistor 5, so that no eddy of air flow occurs near the root of the attachment part of the thermistor 5, and the side wall 6 does not.
The hot air 10 flowing along the thermistor 5 smoothly passes through the thermistor 5.

When a circuit such as a gas leak alarm function is added to the fire detector 1, the housing 2 becomes thicker. In this case, since the size of the housing 2 becomes large, the structure of FIG. 3 in which the ventilation path 7 through which the hot air 10 flows is provided on the side surface of the housing 2 rather than the structure of FIG.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and applications are possible. For example, in the above embodiment, the protection frame 4 is
It is composed of a small-diameter wheel, a large-diameter wheel, and several columns connecting the small-diameter wheel and the large-diameter wheel, but other configurations may be used. Further, in the above-described embodiment, the outer shape of the protective frame 4 has a truncated cone shape, but may have another similar curved surface shape.

Further, two or more ventilation paths 7 may be provided at appropriate positions.

In the ventilation path 7, the opening 7 a is provided on the mounting surface 2 of the housing 2 outside the protection frame 4 of the thermal sensor 3.
You may open it in b.

The shapes of the openings 7a and 7b are as follows.
Shapes other than a circle may be sufficient.

When a plurality of openings 7a are formed in the mounting surface 2b of the housing 2, the size of the opening 7a which is opened at the position closest to the side wall 6 when mounting on the side wall 6 is changed to the opening which can be opened at another position. It may be larger than the dimension of. By adopting such a dimensional relationship, a large amount of hot air rising along the side wall 6 flows into the opening 7a opened at the position closest to the side wall 6, so that the heat can be more smoothly passed.

Further, the shape of the chimney-shaped ventilation passage may be a cross-sectional shape other than a circular cross-section.

[0036]

According to the first aspect of the present invention, dust adheres little to the thermistor, and the response speed to the ambient temperature does not deteriorate. Also, the adhesion of oil to the thermistor decreases,
The response speed to the ambient temperature does not easily deteriorate.

According to the second aspect of the invention, the hot air smoothly passes through the thermistor.

According to the third aspect of the present invention, the hot air smoothly passes through the thermistor. It is also suitable for a case where the size of the housing is increased by adding a circuit such as a gas leak alarm function.

[Brief description of the drawings]

FIG. 1 shows an example of the structure of a side wall type fire detector according to the present invention, wherein (a) is a perspective view, (b) is a front view, and (c) is a plan view.

FIG. 2 is a schematic view for explaining how to use the side wall type fire detector of FIG. 1;

FIG. 3 shows another example of the structure of the side wall type fire detector according to the present invention, wherein (a) is a perspective view, (b) is a front view, and (c) is a plan view.

FIG. 4 is a schematic view for explaining how to use the side wall type fire detector of FIG. 3;

FIG. 5 is a perspective view showing a structural example of a conventional ceiling fire detector.

FIG. 6 is a schematic view illustrating a method of using the conventional ceiling fire detector of FIG. 5;

FIG. 7 is a perspective view showing a structural example of a conventional side wall type fire detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side wall type fire detector 2 Housing 2a Attachment part 2b Attachment surface 3 Thermal sensor 4 Protection frame 5 Thermistor 6 Side wall 7 Ventilation path 7a Opening 7b Opening

Claims (3)

[Claims] 1. A side wall type fire detector used by being attached to a side wall, comprising: a housing having a built-in sensing circuit component and having an attachment portion for attaching to the side wall; A side wall type fire detector, comprising: a heat sensor mounted so as to be in the form of a fire sensor. 2. The external shape of the housing and the thermal sensor is formed so as to be streamlined without a step when the thermal sensor is attached to the housing. Side wall type fire detector. 3. The side wall type fire detector according to claim 1, wherein an air passage penetrating from a mounting surface on which the thermal sensor is mounted to another surface is formed inside the housing.