KR102053418B1 - Photoelectric fire detector having dual sensors - Google Patents

Abstract

A photoelectric fire detector having a dual sensor is disclosed. According to one aspect of the present invention, the photoelectric fire detector having a dual sensor comprises: a first light emitting element and a second light emitting element for emitting light; a first light receiving element installed at a position for receiving a part scattered by smoke of light emitted from the first light emitting element; a second light receiving element installed at a position for receiving a part scattered by smoke of light emitted from the second light emitting element; and a control module providing a pair of the first light emitting element and the first light receiving element as a main sensor, and a pair of the second light emitting element and the second light receiving element as a sub-sensor, and activating any one of the main sensor or the sub-sensor to detect smoke and outputting a fire alarm.

Description

Photoelectric fire detector with dual sensors {PHOTOELECTRIC FIRE DETECTOR HAVING DUAL SENSORS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector for detecting smoke photoelectrically, and more particularly to a photoelectric fire detector having dual sensors.

 Photoelectric fire detectors detect fires using scattering of light from the incoming smoke as a fire occurs. That is, a dark box that is shielded from light is built in the detector, and the light emitting device and the light receiving device are fixed at an angle inside the dark box. Accordingly, in the normal state, the light cannot be detected by the light receiving element, but when a certain amount of smoke flows into the dark box of the detector due to a fire, the light is detected by the light receiving element by scattered light generated inside the dark box. When the amount of light rises above a certain value, the light receiving element inside the dark box amplifies the signal, sends a signal to the fire receiver and alerts the scene.

Since the photoelectric sensor should have a structure that allows smoke to flow in a fire, the light emitting device and the light receiving device mounted inside the dark box have a structure that can always be in contact with the outside air. Therefore, dust or oil vapor is usually combined with moisture and sticks to the surface of the light emitting device or light receiving device. As a result, after a long time after installation of the detector, the light receiving device or light emitting device becomes increasingly polluted and ultimately detects smoke. The original function will be lost.

As a result, the photoelectric fire detector needs to set a regular cycle to remove substances contaminating the surface of the light emitting device or the light receiving device, but regularly collects a large number of detectors installed in the households of apartment houses that may cause high ceilings or privacy violations It is almost impossible to clean it, which results in a situation in which the function of detecting a fire prematurely deteriorates or it becomes a result. In addition, smoke detectors are difficult to repair or inspect because they are set by fire methods to be installed in vulnerable areas such as high ceilings, stairs, and feet, compared to heat detectors.

Republic of Korea Patent No. 10-1363276 (Registration date February 06, 2014) Photoelectric fire detector

Accordingly, the present invention has been made to solve the above problems, and to provide a photoelectric fire detector having a dual sensor that can extend the operating life and increase the accuracy.

Other objects of the present invention will become more apparent through the preferred embodiments described below.

According to an aspect of the invention, the first light emitting device and the second light emitting device for emitting light; A first light receiving element installed at a position for receiving a part scattered by smoke among the light emitted from the first light emitting element; A second light receiving element installed at a position for receiving a part scattered by smoke among the light emitted from the second light emitting element; And a pair of the first light emitting element and the first light receiving element as a main sensor, and a pair of the second light emitting element and the second light receiving element as a sub sensor, and driving any one of the main sensor and the sub sensor to detect smoke. A fire detector having a dual sensor including a control module for outputting a fire alarm is provided.

Here, while performing a fire detection function using the main sensor, when at least one of the light emission amount of the first light emitting element and the received light amount of the first light receiving element is less than a predetermined minimum threshold value fire detection function using the sub-sensor. Can be performed.

In addition, the control module periodically drives the second light receiving element to sense the light emitted from the first light emitting element, and the first light receiving element is recognized as a fire according to the amount of light detected by the second light receiving element The threshold value for the amount of received light can be set.

In addition, the second light receiving element may be installed at a front position of the first light emitting element.

The control module may output a fire signal after reconfirmation by the main sensor when a fire is detected when the fire detection function is performed by the sub sensor.

In addition, the second light emitting device may have a light emission amount set higher than that of the first light emitting device, or a material having a higher light emission amount may be used.

In addition, the sub-sensor has a distance between the light emitting element and the light receiving element is installed far compared to the main sensor, a fire detector having a dual sensor.

According to the present invention, the use of the dual sensor can not only extend the operating life, but also increase the fire recognition accuracy.

1 is a view inside the box showing the operation principle of a typical photoelectric fire detector.
2 is a view showing the internal structure of a photoelectric fire detector with a dual sensor according to an embodiment of the present invention.
3 is a flow chart illustrating a process of controlling a dual sensor with a control module of the photoelectric fire detector according to an embodiment of the present invention.
4 is a table illustrating reference data for determining threshold setting and sensor replacement drive according to an embodiment of the present invention.
5 is a view showing the internal structure of a photoelectric fire detector with a dual sensor according to another embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, terms such as a first threshold value, a second threshold value, and the like, which will be described later, may be pre-specified as threshold values that are substantially different or partially the same value, but may be confused when expressed with the same word. For the sake of convenience, the terms "first" and "second" will be written together for convenience of classification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

In addition, the components of the embodiments described with reference to the drawings are not limited to the corresponding embodiments, and may be implemented to be included in other embodiments within the scope of the technical spirit of the present invention. Even if the description is omitted, it is obvious that a plurality of embodiments may be reimplemented into one integrated embodiment.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same or related reference numerals and redundant description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

FIG. 1 is a diagram illustrating an internal operation of a general photoelectric fire detector, and FIG. 2 is a diagram illustrating an internal structure of a photoelectric fire detector having a dual sensor according to an exemplary embodiment of the present invention.

First, referring to FIG. 1, currently, a general photoelectric fire detector includes only one light emitting device and a light receiving device in a dark box. The dark box passes through the air only and cannot pass outside light, and only when the light emitted from the light emitting element in the dark box is scattered by the smoke introduced into the dark box, a part of the dark box flows into the light receiving element to recognize the fire. It is.

However, since only one light emitting device and light receiving device are provided, when each device is old or contaminants accumulate in the lioness, abnormal fire recognition may be performed due to incorrect light scattering, or even if a fire occurs Because of the material, light scattering is difficult to occur or the light receiving device may not be able to transmit light well, thereby preventing the fire from being recognized normally.

Referring to FIG. 2, which shows an example of the present invention for solving this problem, two light emitting devices (first light emitting device 20-1 and second light emitting device 20-2) and two inside the dark box 10 are provided. Light receiving elements (the first light receiving element 30-1 and the second light receiving element 30-2) are provided. The first light emitting device 20-1 and the first light receiving device 30-1 form a pair, and the other part of the other pair detects a fire. That is, the photoelectric fire detector according to the present embodiment includes a dual sensor having two light emitting elements and a light receiving element.

In the fire detector having the dual sensor according to the present embodiment, the first light emitting device and the first light receiving device are set as the main sensor, and the second light emitting device and the second light receiving device are set as the sub-sensors. It further comprises a control module for outputting a fire alarm by detecting any smoke by driving any one of the main sensor or the sub-sensor. The control module controls the driving of the main sensor and the sub-sensor, and transmits a fire occurrence signal using a communication means (not shown) provided as a fire receiving panel by using the amount of light detected by each light receiving element.

Hereinafter, a method of controlling the main sensor and the sub sensor by the control module will be described.

3 is a flowchart illustrating a process of controlling a dual sensor equipped with a control module of the photoelectric fire detector according to an embodiment of the present invention.

Referring to FIG. 3, first, a main sensor (that is, a first light emitting device 20-1 and a second light receiving device 30-1) is driven to perform a fire detection function, and a preset period (for example, The sub light receiving element (ie, the second light receiving element 30-2) senses the light emitted from the main light emitting element (ie, the first light emitting element 20-1) every 24 hours or 100 hours. That is, the second light receiving element 30-2, which is a sub light receiving element, is not normally driven but is periodically driven to sense light. Referring to FIG. 2, according to an example, the second light receiving element 30-2 may be installed in the front direction to receive a lot of light from the first light emitting element 20-1. Therefore, the amount of light emitted by the first light emitting device 20-1 can be known by measuring the amount of light received by the second light receiving device 30-2. 2, the first light receiving element 30-1 may also be positioned in the front direction of the second light emitting element 20-2, but is not necessarily limited thereto (FIG. 5 and accordingly). See description).

The threshold value for fire recognition by the main sensor may be set using the received light amount of the second light receiving element 30-2, or it may be determined whether to replace the sub-sensor with driving.

4 is a table illustrating reference data for determining threshold setting and sensor replacement driving according to an embodiment of the present invention.

Referring to FIG. 4, a threshold value of the received light amount for the fire recognition of the main light receiving element 30-1 may be set according to the received light amount of the second light receiving element 30-2 which is the sub light receiving element. For example, when the sensing value of the sub light receiving device 30-2 (that is, the amount of received light receiving the light emitted from the first light emitting device 20-1) is 100 or more, the main light receiving device 30- The fire signal is output only when 1) senses more than 20 received lights. Of course, the numerical values of the sensing values given in the present embodiment are merely examples for explanation, not absolute values, and the detailed description will be omitted since the actual intensity and measurement unit of light will be apparent to those skilled in the art.

When the sensing value of the sub light receiving element 30-2 is less than the minimum threshold value (60 in the drawing), the driving sensor is replaced with the sub sensor. In other words, recognizing that the function of the main sensor is significantly reduced, the driving of the main sensor is stopped, and fire detection using the second light emitting device 20-2 and the second light receiving device 30-2, which are sub-sensors, is performed. It is.

Referring to FIG. 3 again, the control module of the fire detector determines whether the received light quantity value sensed by the sub-light-receiving element is less than the minimum threshold value (S320). Performs a fire detection function using (S340).

Alternatively, unlike the method of stopping the driving of the main sensor and performing a fire detection function using the sub sensor, according to another example, it may be set to change the role between the main sensor and the sub sensor. In other words, the main sensor is set as the sub sensor and the sub sensor is set to function as the main sensor.

Here, although not shown in the drawing, according to an example, when performing a fire detection function using a sub-sensor, if a fire is detected, the fire module may output a fire signal after reconfirmation by the main sensor. Can be.

As a result of the determination in S320, when the value sensed by the sub-light-receiving element is greater than or equal to the minimum threshold value, the threshold value of the main light-receiving element corresponding to the sensed value is set (S330). Since this has been described with reference to FIG. 4, redundant descriptions thereof will be omitted.

If the sensor driven from the main sensor to the sub-sensor is replaced, it is highly likely that the fire detector itself is old as time passes, and the possibility that a large amount of contaminants are also introduced into the dark box 10. have.

Therefore, it is preferable that the second light emitting device 20-1, which is a sub-sensor, is set to have a higher light emission amount than the first light emitting device 20-1, or a material having a higher light emission amount is used. Similarly, the second light receiving element 30-2 may be preferably made of a material having a higher sensitivity for sensing light than the first light receiving element.

Alternatively, a method of varying the distance between the light emitting device and the light receiving device (the separation angle thereof) may be used.

5 is a diagram illustrating an internal structure of a photoelectric fire detector with a dual sensor according to another embodiment of the present invention.

Referring to FIG. 5, the sub-sensors 20-2 and 30-2 may be installed farther away from the light emitting device than the main sensors 20-1 and 30-1. The reason for this is that since the location is in the dark box 10 of the circular shape, the long distance is because the light from the light emitting element having the straightness is more likely to flow into the light receiving element.

Referring to the drawings, the main sensor is positioned so that the light emitting element 20-1 and the light receiving element 30-1 have an angle of 90 degrees, and normally, light from the light emitting element 20-1 is almost received. 1) will not be delivered. On the other hand, the sub-sensor is positioned such that the light emitting device 20-2 and the light receiving device 30-1 have an angle of 90 degrees or more, so that some of the light from the light emitting device 20-1 is lost even if some contaminants are present therein. It is more likely to be delivered to the light receiving element 30-2 by scattering by smoke.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

10: cancer box
20-1, 20-2: light emitting element
30-1, 30-2: light receiving element

Claims (7)

A first light emitting device and a second light emitting device for emitting light;
A first light receiving element installed at a position for receiving a part scattered by smoke among the light emitted from the first light emitting element;
A second light receiving element installed at a position for receiving a part scattered by smoke among the light emitted from the second light emitting element; And
Setting the first light emitting device and the first light receiving device as a main sensor, and the second light emitting device and the second light receiving device as a subsensor,
First, the fire detection function using the main sensor is performed, and when at least one of the light emission amount of the first light emitting device and the received light amount of the first light receiving device is less than a preset minimum threshold, the fire detection function using the main sensor End the fire detection function using the sub-sensor,
When the fire detection function is performed using the main sensor, the second light receiving element is periodically driven to sense light emitted from the first light emitting element, and the first light receiving element is based on the amount of light detected by the second light receiving element. Sets the threshold for the amount of received light that is recognized as a fire.
The fire detection function by the sub-sensor includes a control module for outputting a fire signal after reconfirmation by the main sensor when a fire is detected,
The sub-sensor is a fire detector having a dual sensor, the distance between the light emitting element and the light receiving element is installed so that the amount of light transmission is higher than the main sensor.
delete delete delete delete The method according to claim 1,
The second light emitting device is a fire detector with a dual sensor, the light emitting amount is set higher than the first light emitting device or a material having a higher light emitting amount is used.
delete

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