CN201044119Y

CN201044119Y - Photoelectricity smoke sensing type fire detector

Info

Publication number: CN201044119Y
Application number: CNU2007200212903U
Authority: CN
Inventors: 张学刚; 金巨宝; 张永和
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-28
Filing date: 2007-04-28
Publication date: 2008-04-02
Anticipated expiration: 2017-04-28

Abstract

The utility model discloses a photoelectric smoke fire detector, comprising a base, a cover which is arranged on the base and is provided with a plurality of vents on the side wall, a circuit board which is arranged on the base and positioned inside the cover, a chassis which is arranged on the circuit board and has a receiving lamp chamber which is provided with a receiver inside and a transmitting lamp chamber which is provided with a transmitting tube, an exhaust fume collecting hood which is arranged on the chassis and is provided with an air vent on the top face, at least three guide ribs which are arranged on the top face of the exhaust fume collecting hood and is distributed radially, a light shied which is arranged on the exhaust fume collecting hood and is provided with a plurality of air intake holes on the side wall, wherein the tops of the guide ribs are pressed against the top face of the inner side of the light shied. The utility model can change the angle of the side wall to prevent dust and to reflect light rays outside the detector, thereby improving the induction sensitivity and avoiding false alarms.

Description

Photoelectric smoke type fire detector

Technical field

The utility model relates to a kind of fire alarm installation, particularly relates to a kind of photoelectric smoke type fire detector.

Background technology

Fire is in case take place and will be difficult to estimated loss to what people brought, and the best method of avoiding losing is promptly in time found the condition of a fire before fire takes place, and in addition control effectively, and therefore, people often adopt the fire alarm installation detection condition of a fire.But, existing fire alarm installation sensitivity is lower, be prone to the wrong report situation, its main cause is: 1, dustproof effect is relatively poor, the dust that enters warning device easily is adsorbed on inner walls, the light that transmitter sends is met dust generation irregular reflection, makes receiving trap receive light and sends false alarm; 2, it is outdoor that the light of transmitter is difficult for ejaculation, because mostly the sidewall of existing warning device is vertical angle, the light that transmitter penetrates is interreflection in housing easily, in case be received by the receiver, promptly sends false alarm information.

Summary of the invention

The purpose of this utility model provides a kind of photoelectric smoke type fire detector, and it can both can prevent dust by the angle that changes sidewall, light can be reflexed to outside the detector again, thereby reach the purpose that improves induction sensitivity, avoids false alarm.

The purpose of this utility model is achieved through the following technical solutions: photoelectric smoke type fire detector comprises pedestal, cover body is installed on the pedestal, offer a plurality of air vents on the sidewall of cover body, mounting circuit boards on the pedestal, circuit board is positioned at cover body, installation chassis on the circuit board, install on the chassis and receive lamp house and emission lamp house, the indoor installation receiver of receiving light, in the emission lamp house power valve is installed, exhaust fume collecting hood is installed on the chassis, and the end face of exhaust fume collecting hood is provided with air-permeating hole, and at least three guiding ribs are installed on the end face of exhaust fume collecting hood, the polylith guiding rib radially distributes, light shield is installed on the exhaust fume collecting hood, is offered a plurality of fresh air inlets on the sidewall of light shield, the top of guiding rib contacts with the end face of light shield inboard.

For further realizing the purpose of this utility model realizing by the following technical solutions: the angle that receives between lamp house and emission lamp house is α, and the α angle is 90 to 120 degree.Baffle plate is set on the chassis, and baffle plate hangs down and sees that in the chassis extended line of the axis of power valve, the axis of receiver and baffle plate intersects at the center on chassis.Collection cigarette cover is installed in the chassis, and collection cigarette cover is positioned at exhaust fume collecting hood, and the transmitting terminal of emission lamp house is positioned at collection cigarette cover with the receiving end that receives lamp house.Collection cigarette cover is a conical sleeve, and the less end of collection cigarette cover diameter contacts with the chassis, and the bigger end of collection cigarette cover diameter contacts with exhaust fume collecting hood.Girth sheets is installed in the air-permeating hole, and girth sheets is connected with guiding rib.The periphery of guiding rib is installed fly net, and fly net is a ring network.Pedestal is connected and composed by base and middle seat.

Good effect of the present utility model is: it is equipped with exhaust fume collecting hood, light shield and chassis, exhaust fume collecting hood, light shield and chassis cooperate can constitute a sense smoke-box with good ventilation shaded effect, the sense smoke-box is connected and composed by a plurality of parts, has processing and fabricating advantage simple, convenient for installation and maintenance.Sense also is equipped with collection cigarette cover in the smoke-box, and collection cigarette cover has tapered sidewalls, can prevent effectively that dust from adhering to, and light can be reflected outside the detector, thereby can improve the sensitivity of detector, prevents the generation of false alarm situation.

Description of drawings

Fig. 1 is a structural representation of the present utility model; Fig. 2 is a sectional structure synoptic diagram of the present utility model; Fig. 3 is that each plug-in unit of photoelectric smoke type fire detector is with the sectional exploded view before the mutual setting-in; Fig. 4 is that the A of Fig. 3 is to structural representation; Fig. 5 is that the B of Fig. 3 is to structural representation; Fig. 6 is that the C of Fig. 3 is to the structure for amplifying synoptic diagram.

Embodiment

Photoelectric smoke type fire detector described in the utility model comprises pedestal, and pedestal can be connected and composed by base 9 and middle seat 10.On the middle seat 10 cover body 2 is installed, middle seat 10 and cover body 2 connect and compose a complete detector housing.Offer a plurality of air vents 20 on the sidewall of cover body 2, mounting circuit boards 8 on the middle seat 10, circuit board 8 is positioned at cover body 2, and installation chassis 7 on the circuit board 8, installs on the chassis 7 to receive lamp house 6 and emission lamp house 13, receive receiver 23 is installed in the lamp house 6, in the emission lamp house 13 power valve 22 is installed, power valve 22 can be an infrared emission tube, and exhaust fume collecting hood 4 is installed on the chassis 7, the end face of exhaust fume collecting hood 4 is provided with air-permeating hole 19, and air-permeating hole 19 can be a manhole.Circuit board 8 is pcb boards.At least three guiding ribs 11 are set on the end face of exhaust fume collecting hood 4, as shown in Figure 4, six guiding ribs 11 are set on the end face of exhaust fume collecting hood 4, six guiding ribs 11 radially distribute, light shield 3 is installed on the exhaust fume collecting hood 4, offer a plurality of fresh air inlets 17 on the sidewall of

light shield

3,17 of adjacent two fresh air inlets constitute a muscle 24, the top of guiding rib 11 contacts with the end face of light shield 3 inboards, the quantity of muscle 24 is identical with the quantity of guiding rib 11, after light shield 3 and exhaust fume collecting hood 4 installed and cooperated, guiding rib 11 was corresponding one by one with a muscle 24, constitutes six fan-shaped fume inlet passages.The angle that receives

lamp house

6 and 13 of emission lamp houses is α, and the α angle is 90 to 120 degree, through repeated tests, when the α angle is 90 to 120 when spending, can make detector all reach optimum value in detection from the sensitivity of the flue gas of each different directions.Baffle plate 14 is set on the chassis 7, baffle plate 14 intersects at the center on chassis 7 perpendicular to the extended line of the axis of the axis of chassis 7 power valves 22, receiver 23 and baffle plate 14, baffle plate 14 can prevent effectively that the light that the sends mistake of power valve 22 from injecting in the receiver 23, can improve the sensitivity of detector.The collection cigarette is installed in the chassis 7 is overlapped 1, collection cigarette cover 1 is positioned at exhaust fume collecting hood 4, and the receiving end of the transmitting terminal of emission lamp house 13 and reception lamp house 6 is positioned at collection cigarette cover 1.Collection cigarette cover 1 is a conical sleeve, the collection cigarette overlaps the less end of 1 diameter and contacts with chassis 7, the collection cigarette overlaps the bigger end of 1 diameter and contacts with exhaust fume collecting hood 4, and collection cigarette cover 1 is in a certain angle with the axis direction of power valve and receiving tube, outside the light directive collection cigarette cover 1 that can be convenient to reflect.As Fig. 1, Fig. 2 and shown in Figure 6, collection cigarette cover 1 is provided with first draw-in groove 15 and second draw-in groove 16, receives lamp house 6 and is penetrated in the collection cigarette cover 1 by first draw-in groove 15, and emission lamp house 13 is penetrated in the collection cigarette cover 1 by second draw-in groove 16.Collection cigarette cover 1 can make the flue gas that enters in the detector more concentrated, makes detector may detect the lower flue gas of concentration, thereby improves detector sensitivity.Girth sheets 12 is installed in the air-permeating hole 19, and girth sheets 12 is connected with guiding rib 11, and the different girth sheets 12 of a plurality of diameters can be installed in same plane in the air-permeating hole 19 with one heart, and a plurality of girth sheets 12 are divided into rule annular air inlet with air-permeating hole 19.The periphery of guiding rib 11 is installed fly net 5, and fly net 5 is ring networks, and fly net 5 can play vermins-proof effect effectively, prevents from that winged insect from entering in the collection cigarette cover 1 false alarm to occur.21 is pilot lamp among the figure, pilot lamp 21 is connected with circuit board 8 by lead, as Fig. 1, Fig. 2 and shown in Figure 3, symmetry is installed two pilot lamp 21 on the circuit board 8, the 18th, the lamp hole of offering on the cover body 2, can offer two lamp holes 18 by corresponding two pilot lamp 21 on the cover body 2, each pilot lamp 21 is positioned at a corresponding lamp hole 18.On the cover body 2, can offer two osculums being positioned on the vertical direction of two lamp holes, 18 place diameters, so that the water that enter in the cover body 2 can in time be discharged.When the utility model is made, process each parts and assembling by above-mentioned requirements.When installing and using, earlier base 9 is fixed on the ceiling; Again each parts is installed in the housing that constitutes by middle seat 10 and cover body 2, promptly constitutes a complete detector; Then middle 10 is connected with base 9, to reach the purpose of fixed detector.When the condition of a fire takes place, flue gas can be successively by ventilating opening 20, fresh air inlet 17, in fly net 5 enters six fan-shaped fume inlet passages, annular air inlet through 12 of girth sheets enters in the collection cigarette cover 1 again, when the light that sends when power valve 22 is met flue gas particle, irregular reflection can take place, and after light was reflected into receiver 23, receiver 23 sent alerting signal.Technical scheme described in the utility model is not restricted in the scope of embodiment described in the utility model.The utility model not technology contents of detailed description is known technology.

Claims

1. photoelectric smoke type fire detector, it is characterized in that: comprise pedestal, cover body (2) is installed on the pedestal, offer a plurality of air vents (20) on the sidewall of cover body (2), mounting circuit boards on the pedestal (8), circuit board (8) is positioned at cover body (2), circuit board (8) is gone up installation chassis (7), chassis (7) is gone up to install and is received lamp house (6) and emission lamp house (13), receive receiver (23) is installed in the lamp house (6), power valve (22) is installed in the emission lamp house (13), chassis (7) is gone up exhaust fume collecting hood (4) is installed, the end face of exhaust fume collecting hood (4) is provided with air-permeating hole (19), at least three guiding ribs (11) are set on the end face of exhaust fume collecting hood (4), and polylith guiding rib (11) radially distributes, and exhaust fume collecting hood (4) is gone up light shield (3) is installed, offer a plurality of fresh air inlets (17) on the sidewall of light shield (3), the top of guiding rib (11) contacts with the end face of light shield (3) inboard.

2. photoelectric smoke type fire detector according to claim 1 is characterized in that: the angle that receives between lamp house (6) and emission lamp house (13) is α, and the α angle is 90 to 120 degree.

3. photoelectric smoke type fire detector according to claim 2, it is characterized in that: baffle plate (14) is set on chassis (7), baffle plate (14) is perpendicular to chassis (7), baffle plate (14) is positioned in the middle of power valve (22) and the receiver (23), and the axis of the axis of power valve (22), receiver (23) and the extended line of baffle plate (14) intersect at the center of chassis (7).

4. according to each described photoelectric smoke type fire detector of claim 1 to 3, it is characterized in that: collection cigarette cover (1) is installed in chassis (7), collection cigarette cover (1) is positioned at exhaust fume collecting hood (4), and the receiving end of the transmitting terminal of emission lamp house (1 3) and reception lamp house (6) is positioned at collection cigarette cover (1).

5. photoelectric smoke type fire detector according to claim 4 is characterized in that: collection cigarette cover (1) is a conical sleeve, and the less end of collection cigarette cover (1) diameter contacts with chassis (7), and the bigger end of collection cigarette cover (1) diameter contacts with exhaust fume collecting hood (4).

6. photoelectric smoke type fire detector according to claim 5 is characterized in that: girth sheets (12) is set in the air-permeating hole (19), and girth sheets (12) is connected with guiding rib (11).

7. photoelectric smoke type fire detector according to claim 6 is characterized in that: the periphery of guiding rib (11) is installed fly net (5), and fly net (5) is a ring network.

8. according to each described photoelectric smoke type fire detector of claim 1 to 3, it is characterized in that: pedestal is connected and composed by base (9) and middle seat (10).

9. photoelectric smoke type fire detector according to claim 8 is characterized in that: girth sheets (12) is set in the air-permeating hole (19), and girth sheets (12) is connected with guiding rib (11).

10. according to each described photoelectric smoke type fire detector of claim 1 to 3, it is characterized in that: girth sheets (12) is set in the air-permeating hole (19), and girth sheets (12) is connected with guiding rib (11).