JPH04268698A - Photoelectric type smoke detector - Google Patents

Abstract

PURPOSE:To reduce time and trouble for cleaning at the site by providing the photoelectric type smoke detector on a cleaning device capable of inserting to the smoke path between labyrinths. CONSTITUTION:A photoelectric type smoke detector 1 with a sensor head 3 equipped with light projection part and a light receiving part arranged so as to form the detection area where the projection area and the light receiving area are intersected in an optical room, a labyrinth body 4 forming the optical room by providing many labyrinths forming the labyrinth smoke path to which the smoke flows in but the outside light is not made incident and formed freely attachable and detachable to the above sensor head 3 is provided with a cleaning device 5 capable of the insertion to the above-mentioned smoke path. Further, cleaning device housing parts 3h, 3h with the cleaning device 5 are provided on the rear part of the sensor head 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric smoke detector.

0002

2. Description of the Related Art FIG. 4 is an exploded perspective view showing a photoelectric smoke detector 1. The photoelectric smoke detector 1 has a flat cylindrical base 2, a cylindrical peripheral side portion 3g, and a flat inverted a sensor head 3 shaped like a conical tip with its tip removed;
It is composed of a labyrinth body 4 which has a cylindrical shape with a bottom in appearance.

[0003] The base 2 is attached to the ceiling.
A connection terminal (not shown) is provided on the upper part of the base 2 for connection to a fire receiver (not shown) via a signal line (not shown). Furthermore, locking portions 2a, 2a are formed at the lower part of the base 2 for supplying power to the sensor head 3 and for attaching and detaching the sensor head 3.

The sensor head 3 is located on the back side of the sensor head 3.
A plurality of locking pieces (not shown) are provided for receiving power from the base 2 and for attaching and detaching the sensor head 3 to the base 2. A light projecting section 3b and a light receiving section 3c are respectively disposed in the lower tip recess 3a of the sensor head 3, and the light projecting section 3
The light emitting area b and the light receiving area of the light receiving part 3c are arranged so as to intersect slightly below the center of the lower tip recess 3a of the sensor head 3 to form a detection area. Furthermore, locking means for locking the labyrinth body 4 is formed on the peripheral side wall 3d of the lower tip recess 3a.

The labyrinth body 4 is removably attached to the lower tip recess 3a of the sensor head 3. Ring-shaped locking ring 4 forming a means
a, a disk-shaped bottom plate 4b forming a bottom surface, and a large number of labyrinths 4d, which are pillars having a substantially doglegged cross section, connecting the locking ring 4a and the bottom plate 4b, and these labyrinths are made of synthetic resin. It is formed by integral molding of resin.

Further, the labyrinths 4d, which are pillars having a substantially doglegged cross section, each protrude inward from the inner peripheral wall of the locking ring 4a and are connected to the bottom plate 4b in a columnar manner, so that the labyrinths 4d, . A substantially doglegged flue 4e is provided with appropriate intervals so that smoke can flow in but outside light from the surroundings cannot enter.
is formed. Further, FIG. 5 shows a plan view of the labyrinth body 4.

Note that the lower tip recess 3a of the sensor head 3
The inner surface of the labyrinth body 4 (including the surfaces of the labyrinths 4d, . . . ) is dark between the lower tip recess 3a of the sensor head 3 and the inner surface of the labyrinth body 4 when the labyrinth body 4 is locked to the sensor head 3. Surface treatments such as black painting are applied to form an optical chamber. Also, labyrinth body 4
An insect net 4c is wrapped around the outer periphery formed by the large number of labyrinths 4d, . . . to prevent insects from entering the optical chamber from the outside through the flue 4e.

By the way, when the above-mentioned photoelectric smoke detector 1 is used for many years, dirt such as dust adheres to the inside of the labyrinth body 4, and the black paint applied to form a dark optical room becomes damaged. The effect of the surface treatment is lost, and the light emitting part 3b
The light irradiated from the labyrinth body 4 is diffusely reflected on the inner surface of the labyrinth body 4, and the external light is diffusely reflected from the flue 4e and enters the optical chamber, which adversely affects the characteristics of the photoelectric smoke sensor 1. Therefore, it is necessary to periodically remove the labyrinth body 4 from the sensor head 3 and perform cleaning to remove dirt.

[0009]

[Problems to be Solved by the Invention] However, in recent years, there has been a demand for downsizing of the photoelectric smoke detector 1, so the labyrinth 4d,
...The labyrinth-like flue 4e, which is the gap between them, has also become narrower, and the only way to remove dirt adhering to the surfaces of the labyrinths 4d, ... at the site is to blow it away with an air gun or the like. However, if the dirt cannot be removed by wind pressure alone, it is difficult to deal with it on-site, and it becomes necessary to take it to the manufacturer and remove the dirt, which poses a problem in that cleaning the labyrinth body 4 takes time and effort.

The present invention has been made to improve the above problem, and its purpose is to easily remove dirt adhering to the surface of the labyrinth that forms the labyrinth-like flue on-site. To provide a photoelectric smoke detector which can be used easily and which saves time and labor for cleaning a labyrinth body.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a photoelectric smoke detector according to claim 1, in which a light emitting area and a light receiving area are formed to intersect with each other. A sensor head including a light emitting part and a light receiving part arranged so that the detection area is formed within the optical chamber, and a large number of labyrinths forming a labyrinth-like flue through which smoke flows but outside light does not enter. A photoelectric smoke detector comprising a labyrinth body forming an optical chamber and detachably attached to the sensor head, wherein a cleaning tool insertable into the flue is attached to the photoelectric smoke detector. It is characterized by

The photoelectric smoke detector according to the second aspect of the present invention is characterized in that a cleaning tool accommodating portion to which the cleaning tool is attached is provided on the back side of the sensor head.

[0013]

[Function] With the above structure, in the photoelectric smoke detector according to claim 1, dirt attached to the surface of the labyrinth can also be removed by the cleaning tool, and the photoelectric smoke detector according to claim 2 can also remove dirt attached to the surface of the labyrinth. With type smoke detectors, the cleaning tools can be stored in the cleaning tool storage section provided on the back of the sensor head, so there is no chance of losing the cleaning tools, and the stored cleaning tools are photoelectric type. Once a smoke detector is installed, it cannot be seen from the outside.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the photoelectric smoke detector according to the present invention will be described in detail below with reference to FIGS. 1 to 3.

FIG. 1 is an exploded perspective view of a photoelectric smoke sensor 1 according to the present invention, showing a state in which a labyrinth body 4 is locked to a sensor head 3. Since the shapes of the base 2, the sensor head 3, and the labyrinth body 4 are substantially the same as those of the conventional example, parts that could not be shown in FIGS. 4 and 5 of the conventional example and were insufficiently explained, and parts that are different from the conventional example Explain only.

First, to explain the parts that could not be shown in FIGS. 4 and 5 of the conventional example and were insufficiently explained, as shown in FIG. An electronic component accommodating portion 3e is formed, and an electronic component accommodating portion 3e is formed.
A plurality of locking pieces 3f, 3f are provided on the upper surface of the sensor head 3 for receiving power from the base 2 and for attaching and detaching the sensor head 3 to the base 2. Further, there is a ring-shaped space between the electronic component housing portion 3e and the peripheral side portion 3g of the sensor head 3.

Next, the differences from the conventional example will be explained.
In order to accommodate the cleaning tool 5 in the space between the circumferential side 3g of the sensor head 3 and the electronic component accommodating section 3e, clamping pieces 3h, 3h are provided inside the circumferential side 3g to accommodate the cleaning tool 5. The cleaning tool 5 is accommodated and attached to the photoelectric smoke detector 1 by forming the cleaning tool 5 and holding the cleaning tool 5 between the holding pieces 3h, 3h.

As shown in FIG. 3, the cleaning tool 5 has a grip portion 5a.
A cleaning part 5b formed by compressing cloth such as felt material is inserted into the grip part 5a. Note that the cross section of the cleaning part 5b is a labyrinth 4d bent in a substantially dogleg shape,
...The length of the cleaning part 5b is the same as that of the labyrinth 4.
It is shaped slightly longer than the vertical length of d.

Therefore, in order to remove dirt adhering to the labyrinth body 4, the sensor head 3 is first removed from the base 2 attached to the ceiling. After that, the clamping pieces 3h, 3h
At the same time, the labyrinth body 4 is removed from the sensor head 3. Then, grasp the grip part 5a of the cleaning tool 5 with your fingers, insert the cleaning part 5b into the flue 4e from the upper part of the labyrinth body 4, as shown in FIG. 2, and rub the surface of the labyrinth 4d with the cleaning part 5b. By doing so, it is possible to remove dirt that has adhered to the surface of each labyrinth 4d, which cannot be blown off with an air gun or the like. Furthermore, for oil-based stains, the stain removal effect is increased by impregnating the cleaning portion 5b with benzene, alcohol, or the like.

It goes without saying that the cleaning tool 5 can be used not only to remove dirt from the surfaces of the labyrinths 4d, . .

Note that the cleaning tool 5 is not limited to the embodiment, and even if the cross section of the cleaning part 5b does not have substantially the same shape as the flue 4e, it can be inserted into the flue 4e with flexibility and can be inserted into the flue 4e. Needless to say, any material that can thoroughly rub the surfaces of the labyrinths 4d, . . . without damaging the surface treatment of the labyrinths 4d, .

[0022]

Effects of the Invention Since the photoelectric smoke detector of the present invention is constructed as described above, in the present invention as set forth in claim 1, a cleaning tool that can be inserted into the flue between the labyrinths is provided. Since it is attached to a photoelectric smoke detector, it is possible to easily remove dirt from the labyrinth on site, saving time and effort for cleaning. Since the cleaning tool can be stored and attached to the back of the device head, it is possible to provide a photoelectric smoke detector which has an excellent appearance, is convenient for storing the cleaning tool, and prevents the cleaning tool from being lost.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of a photoelectric smoke detector of the present invention.

FIG. 2 is a perspective view showing a method for removing stains from the labyrinth of an embodiment of the photoelectric smoke detector of the present invention.

FIG. 3 is a perspective view showing a cleaning tool of an embodiment of the photoelectric smoke detector of the present invention.

FIG. 4 is an exploded perspective view showing an example of a conventional photoelectric smoke detector.

FIG. 5 is a plan view showing a labyrinth body of an embodiment of a conventional photoelectric smoke detector.

[Explanation of symbols]

1 Photoelectric smoke detector 3 Sensor head 3b Light projecting section 3c Light receiving part 3h Cleaning tool storage area 4 Labyrinth body 4d Labyrinth 4e Flue 5 Cleaning tools

Claims (2)

[Claims] 1. A sensor head comprising a light emitting part and a light receiving part disposed such that a detection area formed by intersecting the light emitting area and the light receiving area is formed in an optical chamber, A photoelectric smoke detector comprising: a labyrinth body formed to be removably attached to the sensor head; a labyrinth body formed to be removably attached to the sensor head; and a labyrinth body formed to form an optical chamber by providing a large number of labyrinths forming a labyrinth-like flue through which external light does not enter. A photoelectric smoke detector characterized in that a cleaning tool that can be inserted into a road is attached to the photoelectric smoke detector. 2. A photoelectric smoke detector, characterized in that a cleaning tool accommodating portion to which the cleaning tool is attached is provided on the back side of the sensor head.