KR102352201B1 - Fire smog detector preventing unwanted alarm - Google Patents

Abstract

The present invention relates to a fire smoke detector, which detects a fire by receiving light by a light receiving device after light emitted from a light emitting device is scattered in smoke from a fire and, more particularly, to a fire smoke detector for reducing a non-fire alarm, which does not require a chamber for a dark room, and determines a type of particles scattering light to prevent a non-fire alarm. According to the present invention, the fire smoke detector for reducing a non-fire alarm comprises: a substrate; a housing mounted on the substrate, and forming a light emitting chamber and a light receiving chamber disposed adjacent to each other; a light emitting device mounted on the substrate, and accommodated in the light emitting chamber to emit light; a light receiving device mounted on the substrate, and accommodated in the light receiving chamber to scatter light of the light emitting device by particles to be received; and a particle analysis module mounted on the substrate, and analyzing a change in a power transmission ratio indicating a relationship between power for light emission of the light emitting device and power in accordance with light reception of the light receiving device to determine a type of scattering particles. The particle analysis module includes: an amplifier for amplifying a voltage in accordance with the light reception of the light receiving device; and a band-pass filter for passing a voltage corresponding to a wavelength band of light emitted from the light emitting device from the voltage amplified by the amplifier.

Description

Fire smoke detector preventing unwanted alarm

The present invention relates to a fire smoke detector that detects fire by receiving light from a light receiving element after light emitted from a light emitting element is scattered from fire smoke. It relates to a fire smoke detector that reduces non-fire alarms to prevent non-fire alarms.

A fire detector is a device for early detection of a fire by recognizing heat or smoke generated during a fire.

Fire detectors include fire heat detectors, smoke detectors, complex detectors, and flame detectors.

The smoke detector detects the occurrence of a fire by operating according to the presence or absence of smoke generated in the event of a fire.

The fire smoke detector has been disclosed in various ways, such as Registered Patent 10-0862117 "Smoke Type Fire Detector", Registered Utility 20-0340682 "Smoke Detection Type Fire Detector", and Registered Patent 10-0892662 "Single Smoke Detector".

In the fire smoke detector, a light emitting element emitting light and a light receiving element receiving the light of the light emitting element are arranged to face 180 degrees or to face each other by about 130 degrees.

The fire smoke detector, in which the light-emitting element and the light-receiving element face 180 degrees, judges a fire when the smoke blocks the light of the light-emitting element and reduces the amount of light received by the light-receiving element. The fire smoke detectors facing each other detect the light of the light emitting element when it is scattered by the fire smoke and received by the light receiving element, and it is judged as a fire.

The fire smoke detector according to the prior art requires a chamber that blocks external light to make a dark room when external light is received by the light receiving element and when a false detection occurs as a fire. With the addition of the chamber, the manufacturing cost of the smoke detector according to the prior art is high, the productivity is low, and the volume is large.

In the case of a fire smoke detector according to the prior art, when particles of water vapor generated during cooking in the kitchen, water vapor particles generated in the bathroom, fine dust particles, etc. penetrate into the chamber, these particles block or scatter the light of the light emitting device to create a light receiving device. A non-fire alarm that activates the That is, the prior art does not distinguish between fire smoke and water vapor or fine dust, so there is a problem in that even the penetration of water vapor or fine dust is recognized as a fire and operated.

The present invention is an invention devised to solve the problems of the fire smoke detector according to the prior art. It does not require a chamber because it is not operated by external light. An object of the present invention is to provide a smoke detector that reduces non-fire alarms that are not triggered by dust or the like.

A fire smoke detector for reducing non-fire alarms according to the present invention for achieving the above object is

Board;

a housing mounted on the substrate and forming a light emitting chamber and a light receiving chamber disposed adjacent to each other;

a light emitting device mounted on the substrate and accommodated in the light emitting chamber to emit light;

a light receiving element mounted on the substrate and accommodated in the light receiving chamber, the light of the light emitting element being scattered by particles;

A particle analysis module mounted on the substrate and configured to determine the type of scattering particles by analyzing a change in a power transmission ratio indicating a relationship between power for light emission of the light emitting device and power according to light reception of the light receiving device;

The particle analysis module includes an amplifier for amplifying a voltage according to the light reception of the light-receiving element, and a band-pass filter for passing a voltage corresponding to a wavelength band of light emitted from the light-emitting element at the voltage amplified by the amplifier. characterized.

And the particle analysis module characterized in that it further comprises an integrator for integrating the voltage passing through the bandpass filter,

The light emitting device is characterized in that it comprises a first light emitting device for emitting infrared light and a second light emitting device for emitting blue light,

It characterized in that it further comprises; a protective device mounted on the substrate and surrounding the periphery of the housing.

The fire smoke detector for reducing non-fire alarms according to the present invention blocks external light beyond the wavelength of light emitted from the light emitting device through a band filter to prevent malfunctions caused by external light, and analyzes and judges the types of particles to prevent It is a very useful invention for industrial development as a product that prevents non-fire alarms from being issued by fine dust, etc.

1 is a perspective view of a smoke detector for reducing non-fire alarms according to an example of the present invention;
Figure 2 is an exploded perspective view of Figure 1;
3 is a view showing main parts of a housing and a light emitting device, a light receiving device, and an analysis module mounted therein;
4 is a circuit diagram of a light emitting device, a light receiving device and an analysis module;

Hereinafter, a fire smoke detector for reducing non-fire alarms according to the present invention will be described in more detail with reference to the drawings.

Prior to explaining in more detail with respect to the smoke detector for reducing non-fire alarms according to the present invention,

Since the present invention can have various changes and can have various forms, implementation examples (態樣, aspects) (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In each drawing, the same reference sign, particularly the number of the tens and one digit, or the reference numerals having the same tens, one, and alphabet, indicates a member having the same or similar function, and, unless otherwise specified, each The member indicated by the reference sign may be regarded as a member conforming to these standards.

In addition, in each drawing, components are expressed in exaggeratedly large (or thick), small (or thin) or simplified in size or thickness in consideration of convenience of understanding, but the protection scope of the present invention is limited by this. it shouldn't be

The terminology used herein is only used to describe a specific embodiment (aspect, aspect, aspect) (or embodiment), and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as comprises or consists of are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

As shown in the drawing, the fire smoke detector for reducing non-fire alarms according to the present invention is a case (10, 20), a speaker (S), a battery (BT), and a detection unit for detecting whether a fire has occurred, the substrate 40, the housing 50 , the light emitting devices 61 and 62 , the light receiving device 70 , the analysis module 80 and the protective device 90 .

As shown in the drawings, the cases 10 and 20 have a circular shape as a whole, and a lower case 20 attached to the ceiling, and one end of the lower case 20 and the lower case 20 are hinged, and the other end is bolted (B). ) and an upper case 10 coupled with a nut (N).

Therefore, the maintenance of the parts built into the cases 10 and 20 is easy because the upper case 10 is opened by flipping and maintenance is performed.

The other ends of the upper case 10 and the lower case 20 of the cases 10 and 20 are assembled by being coupled with a bolt (B) and a nut (N). Bar, the present invention further includes a means for preventing loosening of the nut shown in FIG.

The nut loosening prevention means,

A ratchet toothed portion (C31) formed at the bottom of the receiving groove (C32) formed around the screw hole (C3) of the lower K 20,

Doedoe elastically supported in the direction of the ratchet toothed portion (C31) inside the nut (N), the binding portion protruding and protruding from the front surface (the upper part of FIG. 5 ) of the nut (N) so as to be hooked on the ratchet toothed portion (C31) (N11) and a ratchet bar consisting of a pushing portion (N13) extending to the rear (lower part of Fig. 5) of the binding portion (N11) and having a cam groove (N12) inclined upward from the inside to the outside on one surface ( N1),

The nut (N) is elastically supported toward one of the hexagonal surfaces of the nut (N) inside the nut (N), the pressing portion (N21) protruding and protruding from the hexagonal surface, and extending to the lower portion of the pressing portion (N21), the pressing portion and a pressing bar N2 composed of a pressing part N23 having a pressing protrusion N22 fitted to the cam groove N12 on the other surface in a direction perpendicular to one surface of the (N13).

The ratchet toothed portion (C31) protrudes to the rear while the teeth having an inclined surface inclined upward in the tightening direction of the nut (N) are arranged in a circular shape along the circumference of the screw hole (C3).

The ratchet bar (N1) is fitted on the protruding groove formed on the front surface of the nut (N), the rear end of the pushing part (N13) is supported by the first spring (N3), the binding part (N11) is the nut ( It protrudes to the front of N).

The press bar (N2) is fitted on a protruding groove formed in one of the hexagonal surfaces of the nut (N) so that the lower end of the pressing part (N23) is supported by a second spring (N4), so that the pressing part (N21) is The nut (N) protrudes from the hexagonal surface, and the pressing portion (N21) is formed in a hemispherical shape.

Therefore, when the nut (N) is tightened to the bolt (B) and the binding part (N11) comes into contact with the ratchet toothed part (C31), the ratchet bar (N1) protrudes back and forth while the binding part (N11) is a ratchet tooth After being completely tightened past the portion C31, the nut N is not loosened by vibration or the like as the binding portion N11 is caught on one of the teeth of the ratchet toothed portion C31.

And when the spanner is fitted to the hexagonal surface with the press bar N2 to loosen the nut N, the press bar N2 is inserted while the press part N21 is pressed by the spanner, and at this time, the press part As (N23) descends vertically, the pressing protrusion (N22) descends and pushes the inclined surface of the cam groove (N12) to push the pushing part (N13) to the rear side, and thus the ratchet bar (N1) moves backward and the As the binding portion N11 is drawn into the nut N, it is separated from the ratchet toothed portion C31, and the nut N can be easily loosened with a spanner.

A plurality of distribution holes 11 through which smoke is distributed are formed in the upper case 10, and a sound-through hole 12 disposed directly above the speaker S is formed, and LEDs L1 and L2 are provided. Two LED holes 16 to be exposed to the outside are formed,

On the inner surface of the upper case 10, a pressure protrusion 13 that is pressed by an external force and presses the test switch is formed to protrude,

On the inner surface of the upper case 10, a pressing portion 15 that presses the upper surface of the battery BT mounted on the lower case 20 to prevent the battery BT from leaving its seat by its own weight is formed to protrude is becoming,

On the inner edge of the upper case 10, a 'L'-shaped guide portion 14 in contact with the inner surface and upper surface of the side wall of the lower case 20 is formed to protrude. The guide part 14 serves to assist the upper case 10 and the lower case 20 to be engaged and coupled at a fixed position.

On the inner surface of the lower case 20, a separation prevention wall 22 for preventing the separation of the battery BT by covering the front and rear surfaces and both sides of the battery BT is protruded, and at least one of the four separation prevention walls 22 is formed. A locking portion 23 is formed on the upper surface of the battery BT to tilt the upper case 10 and prevent the battery BT from being separated during the maintenance work of the sensor.

As the sensing unit, the substrate 40 is mounted on the lower case 20, and the housing 50, the light emitting devices 61 and 62, the light receiving device 70, the analysis module 80, the protective equipment 90, and Various electronic devices are installed.

The housing 50 is mounted on the central portion of the upper surface of the substrate 40 and forms a light emitting chamber 51 and a light receiving chamber 52 that are spatially separated and disposed adjacently.

The light-emitting elements 61 and 62 are accommodated in the light-emitting chamber 51 , and the light-receiving element 70 and the analysis module 80 are mounted in the light-receiving chamber 52 .

The housing 50 forms a wall between the light emitting devices 61 and 62 and the light receiving device 70 so that light emitted from the light emitting devices 61 and 62 is not directly incident on the light receiving device 70 .

The light emitting elements 61 and 62 and the light receiving element 70 are arranged adjacently, so that light for fire smoke detection can be used more efficiently, power loss for fire smoke detection is reduced, and the battery (BT) Life expectancy is also increased.

The light emitting devices 61 and 62 include a first light emitting device 61 emitting infrared light (wavelength 850 nm) and a second light emitting device 62 emitting blue light (wavelength 470 nm). By using the two light emitting devices 61 and 62 having different wavelengths in this way, the accuracy of analyzing and judging the types of particles is increased.

The light emitting devices 61 and 62 emit light in the form of short pulses.

Light emitted from the light emitting devices 61 and 62 is scattered by surrounding particles and is incident on the light receiving device 70 .

The light receiving element 70 generates a current or a voltage according to the incident light.

The scattering of light from particles is affected by the type of particle (eg, fire smoke particles, water vapor particles, fine dust particles), particle concentration, particle size, wavelength of light, and angle of incidence of light. Therefore, when the light received by the light receiving element 70 is analyzed, the type of the particle can be identified.

The analysis module 80 analyzes the light received by the light receiving element 70 to determine the type of particle.

The analysis module 80 determines the type of scattering particles by analyzing the change in the power transmission ratio indicating the relationship between the power for light emission of the light emitting devices 61 and 62 and the power according to the light reception of the light receiving device 70 . do.

Referring to the circuit diagram of FIG. 4 , the analysis module 80 includes an amplifier 81 , a bandpass filter 82 , an integrator 83 , an A/D converter 84 , and an operator 85 .

The amplifier 81 amplifies the voltage output by the light receiving element 70 according to the reception of light.

The band-pass filter 82 passes a wavelength of a specific band in the voltage amplified by the amplifier 81 and blocks other wavelengths. That is, the voltage of the wavelength band of the light emitted from the first light emitting device 61 and the second light emitting device 62 is passed, and other voltages are blocked. In other words, the influence of light incident from the outside, not the light emitted from the light emitting elements 61 and 62, is received by the light receiving element 70 is blocked.

The integrator 83 integrates the voltage that has passed through the band pass filter 82 to acquire data regarding the voltage change over time.

The A/D converter 84 converts the analog data for the voltage change integrated in the integrator 83 into digital data.

The calculator 85 calculates a change value of the power transfer ratio with time. For reference, since power is proportional to voltage, and current strengths of the light emitting devices 61 and 62 and the light receiving device 70 are known values, the power value can be calculated from the voltage value of the A/D converter 84 .

The change curve of the power transfer ratio has a specific pattern depending on the wavelength of light and the type of particle. Through this pattern, it is determined whether the particles scattering the light of the light emitting devices 61 and 62 are fire smoke particles.

Fire smoke particles are generally composed of carbon particles or petroleum particles such as polyurethane, polyethylene, and polyvinyl chloride.

Data on the pattern of the power transfer ratio change curve of particles mainly generated in a fire, such as carbon particles or petroleum particles, and particles such as water vapor or fine dust that are not related to fire are stored in the memory, and in the analysis module 80 The obtained power transfer ratio change curve is compared with the pattern data stored in the memory, and the type of scattering particles detected by the sensor is identified according to the similarity.

The protective device 90 is mounted on the substrate 40, covers the housing 50, and the light emitting devices 61 and 62, the light receiving device 70, the analysis module 80, etc. disposed inside the housing. protect

In the above description of the present invention, a fire smoke detector for reducing non-fire alarms having a specific shape and structure has been described with reference to the accompanying drawings, but the present invention can be variously modified and changed by those skilled in the art, It should be construed as belonging to the protection scope of the present invention.

10: upper case 20: lower case
40: substrate 50: housing
51: light-emitting chamber 52: light-receiving chamber
61: first light emitting element 62: second light emitting element
70: light receiving element 80: analysis module
81: amplifier 82: bandpass filter
83: integrator 84: A/D converter
85: operator 90: protective gear
B : Battery S : Speaker

Claims (4)

substrate 40;
a housing (50) mounted on the substrate (40) and forming a light emitting chamber (51) and a light receiving chamber (52) disposed adjacently;
light emitting devices mounted on the substrate 40 and accommodated in the light emitting chamber 51 to emit light;
a light-receiving element 70 mounted on the substrate 40 and accommodated in the light-receiving chamber 52 in which the light of the light-emitting elements 61 and 62 is scattered by particles;
It is mounted on the substrate 40 and analyzes the change in the power transfer ratio indicating the relationship between the power for light emission of the light emitting devices 61 and 62 and the power according to the light reception of the light receiving device 70 to analyze the type of scattering particles Particle analysis module 80 to determine;

The particle analysis module 80 includes an amplifier 81 for amplifying a voltage according to the light reception of the light receiving device 70, and the light emitted from the light emitting devices 61 and 62 at the voltage amplified by the amplifier 81. and a band-pass filter 82 for passing a voltage corresponding to a wavelength band of

A lower case 20 on which the substrate 40 is mounted and attached to the ceiling;
An upper case 10 having one end hinge-coupled to the lower case 20 and the other end coupled with a bolt (B) and a nut (N);
Further comprising a nut loosening preventing means for preventing loosening of the nut (N),

The nut loosening prevention means is
Ratchet toothed portion (C31) formed on the bottom of the receiving groove (C32) formed around the screw hole (C3) of the lower case (20),
Doedoe elastically supported in the direction of the ratchet toothed portion (C31) inside the nut (N), the binding portion (N11) protruding and protruding from the front of the nut (N) so as to be hooked on the ratchet toothed portion (C31), and the binding The ratchet bar (N1), which is connected to the rear of the part (N11) and is composed of a pushing part (N13) having a cam groove (N12) inclined upward from the inside to the outside on one surface,
The nut (N) is elastically supported toward one of the hexagonal surfaces of the nut (N) inside the nut (N), the pressing portion (N21) protruding and protruding from the hexagonal surface, and extending to the lower portion of the pressing portion (N21), the pressing portion A press bar (N2) composed of a pressing part (N23) having a pressing protrusion (N22) fitted in the cam groove (N12) on the other surface in a direction perpendicular to one surface of (N13),

The ratchet toothed portion (C31) protrudes to the rear while the teeth having an inclined surface inclined upward in the tightening direction of the nut (N) are arranged in a circular shape along the circumference of the screw hole (C3),
The ratchet bar (N1) is fitted on the protruding groove formed on the front surface of the nut (N), the rear end of the pushing portion (N13) is supported by the first spring (N3), the binding portion (N11) is the nut ( It protrudes to the front of N),
The press bar (N2) is fitted on a protruding groove formed in one of the hexagonal surfaces of the nut (N) so that the lower end of the pressing part (N23) is supported by a second spring (N4), so that the pressing part (N21) is It protrudes to the hexagonal surface of the nut (N), and the pressing part (N21) is formed in a hemispherical shape,
By tightening the nut (N) to the bolt (B), when the binding part (N11) comes into contact with the ratchet toothed part (C31), the ratchet bar (N1) protrudes back and forth while the binding part (N11) is the ratchet toothed part After being completely tightened past (C31), the nut (N) is not loosened as the binding portion (N11) is caught on one of the teeth of the ratchet toothed portion (C31). smoke detector. The method of claim 1,
The particle analysis module (80) further comprises an integrator (83) for integrating the voltage passing through the band-pass filter (82). 3. The method according to claim 1 or 2,
The light emitting devices (61, 62) include a first light emitting device (61) for emitting infrared light and a second light emitting device (62) for emitting blue light. 4. The method of claim 3,
Mounted on the substrate (40), the protective device (90) surrounding the periphery of the housing (50); Fire smoke detector to reduce non-fire alarm, characterized in that it further comprises.

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