KR20150002299A - Photoelectric smoke detector - Google Patents

Abstract

Disclosed is a photoelectric fire detector having a high response speed to a fire. The photoelectric fire detector of the present invention comprises: a base having one surface attached to the ceiling or wall of a building; and a terminal coupled to the base and having a printed circuit board and a smoke chamber installed therein, wherein the smoke chamber includes: a sensor unit having a light emitting sensor and a light receiving sensor installed therein and including a light shielding unit formed between the light emitting sensor and the light receiving sensor and a maze wall formed along the edge thereof; and a cover unit coupled to the sensor unit and having a smoke hole formed therein to introduce smoke into the smoke chamber and block introduction of foreign materials. The photoelectric fire detector of the present invention can exclude metal properties by including the cover unit having the smoke hole for introducing smoke into the smoke chamber and blocking introduction of foreign materials to integrate a component used for protection against insects and a component used for smoke introduction and fire detection, thereby securing durability and improving convenience in manufacture and productivity. Also, the photoelectric fire detector of the present invention can have a high response speed to a fire by simplifying smoke introduction and discharge paths.

Description

[0001] PHOTOELECTRIC SMOKE DETECTOR [0002]

The present invention relates to a photoelectric fire detector, and more particularly, to a photoelectric fire detector for detecting light scattered by smoke during a fire to generate an alarm.

A fire detector is a part that directly detects the fire of an automatic fire detection system or an automatic fire extinguishing system. It is composed of a differential detector using the expansion of air and a heat detector, There is a detector. (Compensation type) which uses air expansion and heat accumulation at the same time, and a smoke detector which detects smoke, and it is classified into a spot type sensor which detects the local portion and a distributed type sensor which detects the whole area according to the sensing method . Detectors are classified into differential type, differential type, fixed type, spot type, temperature type, linear type, ionization type, photo type, thermal type, smoke type, and thermal type. .

The signal received from the detector is received from the receiver operating by the power supply, and furthermore, the bell is activated by the alarm, and the transmitter is informed by the fire department, so reliability and maintenance of the equipment and wiring constituting the fire alarm system are very important In addition, detailed installation standards are specified by the Fire Service Regulations concerning the installation method of detectors for the target buildings, heat resistance of wiring, and fire resistance.

Photoelectric fire detectors are classified into photosensitive type and light scattering type in which a light emitting source such as an LED is combined with a light receiving device such as a photodiode, and smoke is induced therebetween. In the photosensitive type, the light emitted from the light source is blocked by the particles of the smoke, while the light scattering formula enables the light to be observed at a certain angle from the optical axis because the light from the light source is scattered on the way. The photosensitive type has a characteristic that the sensitivity to smoke is close to the human eye, and the light scattering type has a large sensitivity difference due to the color of smoke.

In this regard, Korean Patent Registration No. 10-0983539 filed and registered by the applicant of the present application discloses a photoelectric fire detector, and more specifically, generates a traveling wave of light through a light emission sensor and generates scattered light by smoke particles Discloses a photoelectric fire detector including a sensor unit for sensing a traveling wave of light through a light receiving sensor and detecting a fire, and a cover unit coupled to an upper portion of the sensor unit for scattering traveling waves of light and inducing a flow of smoke .

According to the photoelectric fire detector according to Korean Patent Registration No. 10-0983539, not only the assembling property and robustness of the photoelectric fire detector are improved, but also the efficiency and precision of fire detection can be improved.

However, in the 'photoelectric fire detector' according to Korean Patent Registration No. 10-0983539, the insectproof unit and the cover unit are separately provided, which has a disadvantage in that the responsiveness to smoke is reduced when a fire occurs or when a fire is extinguished. That is, in the conventional fire detector including the Korean Patent Registration No. 10-0983539, the smoke caused by the fire passes through the smoke inlet hole of the case, the through hole of the insecting net, the smoke inlet hole of the cover unit and the wall of the sensor unit The flow rate of the smoke moving toward the light emitting sensor and the light receiving sensor when the fire occurs and the discharge speed of the smoke escaping from the inside of the fire detector during the fire suppression There was a delay problem.

In addition, since the insectproof unit and the cover unit are separately formed, the manufacturing process is complicated, and particularly, the insectproof unit is made of metal, so that there is a problem that the durability is reduced due to corrosion during use of the fire detector.

In the 'photoelectric fire detector' according to Korean Patent Registration No. 10-0983539, since the light emitting sensor is wrapped with a pair of holders for fixing the light emitting sensor, and the holder is fixed to the light emitting sensor holding portion, There is a problem in that the assembly tolerances existing between the light emitting sensor and the holder and between the holder and the light emitting sensor fixing section are overlapped and the irradiation angle of the light emitting sensor is shifted from each other in proportion to the sum of the assembly tolerances.

In addition, since a curved portion having a circular cross section is formed on the light shielding plate, foreign matter such as dust or ashes adheres to the curved portion in proportion to the passage of the installation time, so that the light travel path between the light emitting sensor and the light receiving sensor becomes narrow When a light reflected by dust, smoke, or a wall portion is reflected again by a curved portion, a considerable number of light reflected by the various reflection angles formed on the curved portion is introduced into the light receiving sensor, There is a problem that the response speed varies depending on the fire detectors.

In addition, in the conventional fire detector including the Korean Patent Registration No. 10-0983539, there is generally provided only one indicator for indicating whether or not the fire is detected. Such an indicator is formed only on one side of the fire detector, There is a problem that can not be confirmed.

(0001) Korean Patent Registration No. 10-0983539 (Registered on September 15, 2010)

It is an object of the present invention to provide a method and a device for manufacturing a photoelectric type fire extinguishing system capable of securing durability by eliminating metallicity in the flow path of smoke and improving the convenience of manufacturing and productivity, Detector.

It is another object of the present invention to provide a photoelectric fire detector capable of easily confirming whether or not an operation is performed in all directions even if the light emitting unit is formed on only one side of the terminal.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. .

According to the present invention, the above object is achieved by a floor structure comprising: a base having one side attached to a ceiling or a wall surface of a building; And a terminal coupled to the base, the terminal including a printed circuit board and a smoke chamber, wherein the smoke chamber is provided with a light emitting sensor and a light receiving sensor, the light shielding portion formed between the light emitting sensor and the light receiving sensor, A sensor unit including a labyrinth wall formed along the labyrinth; And a cover unit coupled to the sensor unit and including a smoke hole for introducing smoke into the smoke chamber and for blocking foreign matter from entering the smoke chamber.

The cover unit may be formed in a cylindrical shape, and the smoke hole may be formed along the circumferential direction of the cover unit.

Wherein the smoke hole comprises: a flow net formed in a circumferential direction to induce a circumferential flow of smoke from the outside of the cover unit; And a supporting network formed inside the flow network.

The cover unit can be manufactured by injection molding.

The light-shielding portion may be formed in the shape of a polygonal bar so that the reflection angle of each segment is constant.

A concave portion may be formed on one side of the light-shielding portion so that light to be refracted is absorbed or reflected to the maze wall side.

The sensor unit may be provided with a first light emitting sensor fixing portion into which the light emitting sensor is inserted and a second light emitting sensor fixing portion inserted into the first light emitting sensor fixing portion and fixing the light emitting sensor may be formed in the cover unit have.

The sensor unit is provided with a first light receiving sensor fixing portion into which the light receiving sensor is inserted and a second light receiving sensor fixing portion inserted into the first light receiving sensor fixing portion and fixing the light receiving sensor is formed in the cover unit have.

A first labyrinth plate having a plurality of labyrinth walls and repeatedly formed along an edge of the sensor unit, the first labyrinth plate having a flat cross-section and a direction orthogonal to a direction other than the center of the sensor unit; And a second labyrinth plate having a flat cross section and extending inwardly of the sensor unit in the first labyrinth plate, and overlapping each other in a non-contact state to cover the sensor unit.

 A line connecting the rear end of the first labyrinth plate and the rear end of the second labyrinth plate in any one of the labyrinth walls in a clockwise or counterclockwise direction is formed in the first labyrinth plate As shown in FIG.

A light emitting unit that emits light when a fire is detected may be provided at one side of the terminal, and the light emitting unit may protrude further than an end of the terminal opposite to a ceiling or a wall surface to which the base is attached.

According to the present invention, by providing the cover unit in which the smoke is introduced into the smoke chamber and the smoke hole for blocking the inflow of the foreign substance is formed, the structure used for insect control and the structure used for smoke inflow and fire detection are integrated Accordingly, it is possible to provide a photoelectric type fire detector having a fast response speed against a fire, because durability can be ensured by eliminating metallicity, the convenience of manufacture and productivity can be improved, and the inflow and discharge paths of smoke can be simplified.

Also, the light emitting part can protrude more than the end part of the terminal opposite to the ceiling or the wall surface to which the base is attached, so that it is possible to provide a photoelectric fire detector capable of easily checking whether the light emitting part is operated in all directions .

1 is a perspective view of a photoelectric fire detector according to an embodiment of the present invention.
2 is an exploded perspective view showing the overall configuration of the photoelectric fire detector of FIG.
FIG. 3 is an exploded perspective view showing a smoke chamber of the photoelectric fire detector of FIG. 1; FIG.
4 is a view showing a sensor unit of the photoelectric fire detector of FIG.
FIG. 5 is a view showing a cover unit of the photoelectric fire detector of FIG. 1. FIG.
Figure 6 is a cross-sectional view of the smoke chamber of the photoelectric fire detector of Figure 1;
7 is a cross-sectional view of the photoelectric fire detector of FIG.
FIG. 8 is a view showing an injection mold of the photoelectric fire detector of FIG. 1; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

The photovoltaic fire detector of the present invention can improve durability by eliminating metallicity in the flow path of smoke, improve the convenience of manufacturing and productivity, and simplify the flow of smoke in and out, .

In addition, even if the light emitting unit is formed on only one side of the terminal, it is possible to easily confirm the operation of the light emitting unit in all directions.

FIG. 1 is a perspective view of a photoelectric fire detector according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the entire construction of the photoelectric fire detector of FIG. 1, FIG. 4 is a view showing a sensor unit of the photoelectric fire detector of FIG. 1, FIG. 5 is a view showing a cover unit of the photoelectric fire detector of FIG. 1, and FIG. FIG. 7 is a cross-sectional view of the photoelectric fire detector of FIG. 1, and FIG. 8 is a view of an injection mold of the photoelectric fire detector of FIG. 1. Referring to FIG.

1 and 2, the photoelectric fire detector 1 according to an embodiment of the present invention detects light scattered by smoke during a fire to generate an alarm, and includes a base 100, And a terminal 300. One side of the base 100 is attached to the building, and the terminal 300 is assembled to the other side of the base 100.

Photovoltaic fire detectors (1) are usually installed in the ceiling of a building. In order to facilitate a quick understanding of the coupling structure of each component constituting the photoelectric fire detector 1 according to an embodiment of the present invention, the upper and lower positions will be described separately in a state of being installed on a ceiling.

Although not shown in detail, the base 100 is coupled to a ceiling or a wall surface of the building on one side thereof, and terminal portions (not shown) are formed on the other side thereof to engage with the terminal terminal T. In the base 100, a coupling hole is formed to be coupled to the ceiling or the wall surface of the building.

The terminal 300 is provided with a printed circuit board P and a smoke chamber 500 and a terminal terminal T connected to the terminal is formed and rotationally coupled with the base 100 installed on the ceiling or wall. The terminal terminal T may be combined with the printed circuit board P in combination with the cover plate C or may be formed integrally with the printed circuit board P. [ A smoke inlet hole 310 is formed in the center of the terminal 300 in which the smoke chamber 500 is installed along the circumferential direction so that the smoke is introduced into the smoke chamber 500.

3, the smoke chamber 500 is constituted by a sensor unit 510 and a cover unit 530 for optically sensing smoke generated in a fire. The sensor unit 510 and the cover unit 530 are coupled to each other and are provided with a light-emitting sensor S1 and a light-receiving sensor S2 for detecting smoke between the spaces. The sensor unit 510 and the cover unit 530 are configured to detect smoke in a state where they are coupled to each other.

4, the sensor unit 510 includes a circular support plate 511, a first light emitting sensor fixing portion 512, a first light receiving sensor fixing portion 513, a light shielding portion 514, 515). The support plate 511 is formed in a circular shape and has an upper surface coupled to a bottom surface of the printed circuit board P and a first light emitting sensor fixing portion 512, a first light receiving sensor fixing portion 513, a light shielding portion 514 And a maze wall 515 are formed. A hook F1 coupled to a fastening hole (not shown) of the printed circuit board P is provided on the upper edge of the support plate 511. [ The hook F1 is formed at intervals of 180 degrees together with the lug F2 to be described later.

5, the cover unit 530 is formed in a cylindrical shape having an opening in the direction of engagement with the sensor unit 510, and includes a circular cover plate 531, a second light emitting sensor fixing unit 532, 2 light receiving sensor fixing portion 533, a shielding wall 534 and a smoke hole 535. [ The second light emitting sensor fixing part 532 corresponds to the first light emitting sensor fixing part 512 and the second light receiving sensor fixing part 533 corresponds to the first light receiving sensor fixing part 513. [

4 to 6, the first light emitting sensor fixing part 512 is provided in a form corresponding to the appearance of the light emitting sensor S1 so that the light emitting sensor S1 is inserted to form a wide contact surface. When the light emitting sensor S1 is inserted into the first light emitting sensor fixing portion 512, the center line of the light source irradiated from the light emitting sensor S1 is directed to the center axis of the smoke chamber 500. [ In one embodiment of the present invention, the light emitting sensor S1 is composed of an infrared diode.

The first light emitting sensor fixing part 512 includes a side wall 512a formed on the left and right sides of the light emitting sensor S1, a rear wall 512b formed on the rear side of the light emitting sensor S1, A first front wall 512c formed on the front side, and a first seating part 512d on which the light emitting sensor S1 is seated.

The first seat portion 512d is formed of a curved surface corresponding to the shape of the infrared ray diode S1 and the infrared ray diode S1 inserted into the first light emitting sensor fixing portion 512 has a first Thereby forming a wide contact surface with the seat portion 512d. A slot 512i is formed in the first front wall 512c so that the light emitted from the light emitting sensor S1 is irradiated into the inner space of the smoke chamber 500. [ The long holes 512i are formed to be narrow at the seating portion to form a step.

The lead wire of the light emitting sensor S1 is disposed behind the first seating portion 512d inside the first light emitting sensor fixing portion 512 and spaced apart from the side wall 512a, the rear wall 512b and the first seating portion 512d Is provided on the upper surface of the base plate 512a. A pair of through holes 512f through which lead wires of the infrared ray diode S1 pass are formed in the support plate 511 of the spacing accommodation portion 512e and a pair of lead wires are formed on the rear wall 512b, (512g).

The infrared diode S1 is provided with a protruding portion in the circumferential direction behind the lens. A step is formed at the boundary between the first seating part 512d and the spacing accommodation part 512e and the flow inhibiting tails 512h are formed on the inner side wall 512a of the spacing accommodation part 512e, The forward and backward flow of the infrared diode S1 within the interior of the section 512 is limited.

The second luminescence sensor fixing part 532 is vertically protruded from the upper surface of the cover plate 531 so that when the sensor unit 510 is coupled with the cover unit 530, . The second light emitting sensor fixing part 532 includes a second seating part 532a which forms a lower flow boundary of the light emitting sensor S1 in the direction opposite to the first seating part 512d and a second seating part 532b which is inserted into the long hole 512i 2 front wall 532b.

When the second light emitting sensor fixing part 532 is inserted into the first light emitting sensor fixing part 512, the light emitting sensor S1 is prevented from flowing and rotating simultaneously with the coupling, The second front wall 532b inserted into the long hole 512i corresponds to the long hole 512i so that the second seating portion 532a is narrowly formed, The fixing portion 512 and the second light emitting sensor fixing portion 532 are prevented from flowing in the irradiation direction.

4 to 6, the first light receiving sensor fixing portion 513 is provided in a form corresponding to the appearance of the light receiving sensor S2 so as to prevent the horizontal flow when the light receiving sensor S2 is inserted . When the light receiving sensor S2 is inserted into the first light receiving sensor fixing portion 513, the center line of the light sensing portion of the light receiving sensor S2 faces the central axis of the smoke chamber 500. [ The light receiving sensor S2 according to an embodiment of the present invention is provided with a photo diode.

The first light receiving sensor fixing portion 513 has a side wall 513a formed on the left and right sides of the light receiving sensor S2, a rear wall 513b formed on the rear side of the light receiving sensor S2, A third front wall 513c formed on the front surface, a sensor accommodating portion 513f for receiving the light receiving sensor S2, and a light inflow portion 513g for determining an inflow angle and an inflow area of the inflow light. (513d).

The light receiving sensor S2 is covered with a shielding cover to shield external electromagnetic waves. The shielding cover covers the entire surface of the light receiving sensor S2 except the upper surface on which the light sensing part and the lead wire are provided. An extension portion fixed to the printed circuit board P at one end of the shielding cover extends in the same direction as the lead wire.

Three through holes (not shown) are formed in the cover plate 531 in the sensor accommodating portion 513f so as to allow the lead wire and the extension portion to pass through when the light receiving sensor S2 is inserted and the upper end of the side wall 513a or the cover plate 531 Is provided with a separation step 513e for separating the cover plate 531 from the light receiving sensor S2.

The third front wall 513c and the partition wall 513d are formed with a first light inlet hole 513h and a second light inlet hole 513i through which light from the light emitting sensor S1 is introduced. The first light inlet hole 513h is preferably formed to be smaller than the second light inlet hole 513i in order to remove noise other than the light reflected by the smoke particles in the light entering the light inlet 513g.

The second light receiving sensor fixing portion 533 has a fourth front wall 533a which is coupled with the first light inlet hole 513h and forms a circular light inflow passage and a second front wall 533b which is in contact with the bottom surface of the light receiving sensor S2, And a flow preventive wall 533b for preventing upward and downward flow of the fluid S2.

When the first light-receiving sensor fixing portion 513 and the second light-receiving sensor fixing portion 533 are coupled, the light-receiving sensor S2 is prevented from flowing and rotating simultaneously with the coupling, thereby always maintaining a constant sensing direction.

3 and 4, the light-shielding portion 514 is provided with a first light-emitting sensor fixing portion 512 and a second light-emitting sensor fixing portion 512 so that the light of the light-emitting sensor S1 is not directly irradiated to the light- 1 light receiving sensor fixing portion 513. [ The light shielding portion 514 is formed in the shape of a polygonal barrel which is elongated along the direction in which the sensor unit 510 and the cover unit 530 are coupled.

When the light shielding portion 514 is formed in the shape of a polygonal barrel, the light is guided to the shielding portion 514 even if the light from the light emitting sensor S1 is reflected by the dust, the smoke or maze wall 515, So that the angle of reflection is constantly formed in each of the compartments (the surface forms one compartment). Therefore, since the light reflected by the light-shielding portion 514 must enter at a specific angle to enter the light-receiving sensor S2, it becomes difficult to enter the light-receiving sensor S2 of the re-reflected light.

Further, a concave portion H which is recessed inward is formed on one side of the light-shielding portion 514. The concave portion H absorbs light reflected toward the shielding portion 514 through the inner side surface or reflects the reflected light toward the labyrinth wall 515 side so that light reflected by the shielding portion 514 enters the light receiving sensor S2 There is an effect of eliminating the reflecting surface. It is preferable that the concave portion H is formed toward the center of the smoke chamber 500 in which light of the light emitting sensor S1 is scattered when the smoke is introduced.

3 and 4, the labyrinth wall 515 is repeatedly formed along the edge of the sensor unit 510 so as to block external light so as to insulate the interior of the labyrinth wall 515, And discharges the inside of the smoke to the outside. The plurality of labyrinth walls 515 are overlapped with each other in a state in which they are not in close contact with each other to cover the inner space of the sensor unit 510.

The labyrinth wall 515 has a first labyrinth plate 515a having a flat cross section and oriented in a direction orthogonal to a direction other than the center of the sensor unit 510 and a second labyrinth plate 515b extending from the first labyrinth plate 515a to the sensor unit 510, And a second maze plate 515b extending inward of the second maze plate 515b. That is, the first labyrinth plate 515a is formed obliquely to the tangent line of the support plate 511 at the edge of the circular support plate 511, and the second labyrinth plate 515b is formed at the inner surface of the first labyrinth plate 515a 1 labyrinth plate 515a in the opposite direction.

When the maze wall 515 is viewed clockwise or counterclockwise with respect to the center of the support plate 511, the rear end of the first maze plate 515a and the rear end of the second maze plate 515a, The line connecting the rear end of the second maze plate 515b is formed so as to be located behind the front end of the first maze plate 515a of the other maze wall 515 located at the rear side. Such an overlapping structure of the first maze plate 515a and the second maze plate 515b prevents external light from entering the interior of the smoke chamber 500. [

3, the shielding wall 534 is formed along the edge of the circular cover plate 531, and covers the labyrinth wall 515 when the sensor unit 510 and the cover unit 530 are engaged. Lt; / RTI > A coupling hole F3 is formed in the upper portion of the shielding wall 534 for coupling the shielding wall 534 and the support plate 511 and a lug F2 inserted in the coupling hole F3 is formed on the outer periphery of the support plate 511. [ Is formed. The engaging hole F3 and the lug F2 are formed at intervals of 180 degrees.

The shielding wall 534 is formed with a smoke hole 535 for introducing smoke into the smoke chamber 500 and blocking foreign substances from entering the smoke chamber 500. The smoke hole 535 is provided through a coupling structure of a flow network N1 formed along the circumferential direction and a supporting network N2 formed inside the flow net N1. The supporting network N2 is formed in the longitudinal direction corresponding to the end of the vertical labyrinth wall 515. [

1 and 7, the smoke moving toward the fire detector 1 due to convection when a fire occurs flows into the smoke chamber 500 installed in the terminal 300 through the smoke inlet hole 310, And the smoke flowing in and out repeatedly flows around the smoke chamber 500. The photoelectric fire detector 1 according to the embodiment of the present invention induces the circumferential flow of the smoke from the outside of the cover unit 530 by forming the flow net N1 in the circumferential direction of the shielding wall 534 .

In the conventional fire detector, the smoke around the smoke chamber flows without directionality and then flows into or out of the smoke chamber according to the convective flow of the room. On the other hand, in the fire detector 1 according to the embodiment of the present invention, Since the smoke around the honeycomb 500 is oriented in the circumferential direction by the flow net N1 formed in the circumferential direction along the circumferential direction, a constant path through which the smoke flows is formed, so that the inflow into and out of the smoke chamber 500 The discharge can be performed more smoothly.

As shown in FIGS. 1 and 7, a light emitting unit 330 is provided at one side of the terminal 300 to emit light when a fire is detected. The light emitting unit L connected to the printed circuit board P is turned on when a fire is detected and the light emitting unit 330 is disposed in front of the light emitting unit L so that the light of the light emitting unit L is reflected / The light of the light emitting body L is exposed to the outside. An LED bulb or the like is used as the luminous body L.

The light emitting portion 330 protrudes more than the end portion of the terminal 300 opposite to the ceiling or wall surface to which the base 100 is attached. One end of the light emitting unit 330 is exposed to the outside of the terminal 300 while the other end of the light emitting unit 330 is disposed adjacent to the lens of the light emitting unit L, Of the bottom surface of the base plate. Accordingly, even if the light emitting unit 330 is formed on only one side of the terminal 300, it is possible to easily check whether the light emitting unit 330 is operated in all directions.

8A and 8B, the cover unit 530 is manufactured by injection molding, and the first upper mold 10, the second upper mold 20, and the lower mold 30 are used for this purpose .

The first upper mold 10 and the second upper mold 20 are for forming an outer shape of the cover unit 530 and correspond to the first upper mold 10 and the second upper mold 20. Accordingly, Each of the dies 20 is formed into a semicircular container shape in plan view. That is, the first upper mold 10 and the second upper mold 20 are generally formed in the form of a circular container opened downward in a state where they are coupled to each other.

The first upper mold 10 and the second upper mold 20 are symmetrical to each other and a first rib 11 and a second rib 21 protruding inward along the circumferential direction are formed respectively . The first rib 11 and the second rib 21 are repeatedly formed in the upward and downward directions, and all of them are formed in the same shape. The flow ribs N1 are formed by the first ribs 11 and the second ribs 21.

The lower mold 30 is formed in a substantially cylindrical shape as means for forming the inner shape of the cover unit 530. A third rib 31 protruding outward along the longitudinal direction is formed on the rim of the lower mold 30. The third ribs 31 are repeatedly formed at regular intervals along the circumferential direction of the lower mold 30. The supporting ribs N2 are formed by the third ribs 31.

The lower mold 30 is inserted into the first upper mold 10 and the second upper mold 20 while the first upper mold 10 and the second upper mold 20 are in close contact with each other and the first upper mold 10 And the space formed by the second upper mold 20 and the lower mold 30 are injected and injection molded.

When the molding of the cover unit 530 in the first upper mold 10, the second upper mold 20 and the lower mold 30 is completed by cooling, the first upper mold 10 and the second upper mold 20 Is horizontally spaced apart and the lower mold 30 is slid downward to release the cover unit 530 from the mold. By such a mold structure and a manufacturing method, it is possible to easily manufacture the cover unit 530 in which the flow net N1 in a lattice form and the support net N2 are integrally formed.

According to the present invention, there is provided a cover unit 530 in which a smoke hole 535 for introducing smoke into the inside of the smoke chamber 500 and blocking the inflow of foreign matter is provided, By integrating the components used for sensing, it is possible to eliminate durability by eliminating metallicity, to improve manufacturing convenience and productivity, and to simplify the inflow and outflow paths of smoke, the photoelectric fire The detector 1 can be provided.

The light emitting unit 330 may further protrude from the end of the terminal 300 opposite to the ceiling or wall surface to which the base 100 is attached so that the light emitting unit 330 may be formed on only one side of the terminal 300, It is possible to provide a photovoltaic fire detector 1 capable of easily confirming whether or not the operation of the fire detector 1 is enabled.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.

1: photoelectric fire detector 100: base
300: Terminal 500: Smoke chamber
310: Smoke inlet hole 510: Sensor unit
330: light emitting portion 511:
530: cover unit 512: first light emitting sensor fixing unit
531: cover plate 513: first light receiving sensor fixing section
532: Second light emitting sensor fixing part 514: Light shielding part
533: second light receiving sensor fixing portion 515: maze wall
534: Shielding wall S1: Light emitting sensor
535: Smoke hole S2: Light receiving sensor

Claims (11)

A base to which one side is attached to the ceiling or wall of the building; And
And a terminal coupled to the base and having a printed circuit board and a smoke chamber,
The smoke chamber includes:
A sensor unit including a light emitting sensor and a light receiving sensor, a light shield formed between the light emitting sensor and the light receiving sensor, and a labyrinth wall formed along the edge; And
And a cover unit coupled to the sensor unit and including a smoke hole for introducing smoke into the smoke chamber and blocking foreign matter from entering the smoke chamber.
The method according to claim 1,
Wherein the cover unit is formed in a cylindrical shape,
And the smoke hole is formed along the circumferential direction of the cover unit.
3. The method of claim 2,
The above-
A flow net formed circumferentially to induce a circumferential flow of smoke from the outside of the cover unit; And
And a support network formed inside the flow network.
The method of claim 3,
Wherein the cover unit is manufactured by injection molding.
The method according to claim 1,
The light-
Wherein a polygonal barrel is formed in the form of a polygonal bar so that the angle of reflection of each zone is constant.
6. The method of claim 5,
On one side of the light-shielding portion,
Wherein a concave portion is formed so that the refracted light is absorbed or reflected toward the maze wall side.
The method according to claim 1,
Wherein the sensor unit is provided with a first light-emitting-sensor fixing portion into which the light-emitting sensor is inserted,
Wherein the cover unit is formed with a second light emitting sensor fixing part inserted into the first light emitting sensor fixing part to fix the light emitting sensor.
The method according to claim 1,
The sensor unit is provided with a first light receiving sensor fixing portion into which the light receiving sensor is inserted,
Wherein the cover unit is provided with a second light receiving sensor fixing portion inserted into the first light receiving sensor fixing portion and fixing the light receiving sensor.
The method according to claim 1,
The labyrinth wall
Wherein the plurality of sensor units are repeatedly formed along an edge of the sensor unit,
A first labyrinth plate having a flat cross-section and oriented in a direction orthogonal to a direction other than the center of the sensor unit; And
And a second labyrinth plate having a flat cross-section and extending inwardly of the sensor unit at the first labyrinth plate,
And the sensor unit is overlapped with each other in a state in which the sensor unit is not closely contacted to cover the inside of the sensor unit.
10. The method of claim 9,
A line connecting the rear end of the first labyrinth plate and the rear end of the second labyrinth plate in any one of the labyrinth walls in a clockwise or counterclockwise direction is formed in the first labyrinth plate Is positioned behind the front end of the fire detector.
11. The method according to any one of claims 1 to 10,
A light emitting unit that emits light when a fire is detected is provided on one side of the terminal,
Wherein the light emitting part protrudes from an end of the terminal opposite to a ceiling or a wall surface to which the base is attached.

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