CN201274081Y

CN201274081Y - Cartridge type smoke alarm

Info

Publication number: CN201274081Y
Application number: CNU2008201647644U
Authority: CN
Inventors: 王荣庆
Original assignee: 王荣庆
Current assignee: Ningbo Lexing Inductor Electronic Co., Ltd.
Priority date: 2008-09-25
Filing date: 2008-09-25
Publication date: 2009-07-15
Anticipated expiration: 2018-09-25

Abstract

The utility model relates to a cassette type smoke alarm which comprises an upper cover, a lower cover, a bottom cover, a breadboard, an infrared transmitting tube and an infrared receiving tube, wherein, the infrared transmitting tube and the infrared receiving tube are arranged on the breadboard; a middle cover plate is arranged between the upper cover and the lower cover; the middle cover plate forms an air window in circular ring distribution through being circled by a circular top face and a plurality of vertical plates which are arranged in a radial way; the lower end of the vertical plate is corresponding to one end of bent plates arranged in the same direction as bent angles; the other end of the bent plates is circled into an circular ring air chamber; the circular ring air chamber can be used for preventing light from entering the circular ring air chamber and can guiding smoke to fast enter the circular ring air chamber; and a light path intersecting point of the infrared transmitting tube and the infrared receiving tube is arranged in the center position of the circular ring air chamber. The utility model has the advantages that a smoke passage is designed into a cassette structure, and the utility model has the main technical scheme that a circular ring air inlet window and a light blocking window which are in radical distribution are arranged under the circular top face of the middle cover plate, light of outer environment including infrared radiation are completely blocked outside the cassette, the light interference from the environment is eliminated, the error alarming is reduced, and the sensitivity and the reliability are improved.

Description

Magazine formula smoke alarm

Technical field

The utility model relates to a kind of smog sensing arrangement of smoke alarm, specifically can import smog in the smoke alarm and can intercept the smog sensing arrangement that the light that comprises infrared ray enters again.

Background technology

Present smoke alarm is reported to the police by the infra-red detection smokescope, specifically launch the infrared ray of certain energy to be located at infrared transmitting tube in the alarm, when smog enters the cavity that infrared ray passes through, ultrared energy is decayed by smog, the infrared energy that reflexes to infrared receiver tube reduces, and produces alerting signal.Therefore to importing the cavity of smog, both requirement can promptly guide smog to enter, and required the light in the environment to comprise that infrared ray can not enter as far as possible again, disturbed and the generation wrong report to avoid the light in the environment.The smoke path of existing smoke alarm by many isolating bar radial distribution around infrared transmitting tube and receiving tube, enter with guiding smog, in order to stop the light that comprises infrared ray to enter better, isolating bar is bent into crooked flue, and come on the same circle with infrared transmitting tube and infrared receiving tube, this distribution can only stop light all around, can not stop the light that enters up and down from wiring board, so anti-interference is not significantly improved.CN2932519Y proposes a kind of smoke alarm labyrinth, and described labyrinth loam cake or lower cover circumferential inner wall are shaped on the unit, labyrinth that is the bending of "＜" word.Represent from embodiment description and accompanying drawing, "＜" font unit still comes on the inwall circle together with infrared transmitting tube and infrared receiving tube, short foreign minister's structure in the division board be difficult to stop that labyrinth light and wiring board light up and down all around enters, thereby interference free performance does not improve obviously yet.

Summary of the invention

The technical problems to be solved in the utility model is, designs a kind of comprehensive quick guiding smog admission passage and reduces ambient light simultaneously as far as possible and enter smog sensing passage in the smoke alarm cavity, reaches the raising interference free performance, prevents false alarm.

Design proposal of the present utility model is: magazine formula smoke alarm, it comprises loam cake, lower cover, bottom, wiring board and the infrared transmitting tube and the infrared receiving tube that are located on the wiring board, it is characterized in that between loam cake and lower cover, establishing cover plate, cover plate surrounds the transom window that annulus distributes by dome face and some risers that is radial setting, the riser lower end is corresponding with bent plate one end that bent angle is arranged in the same direction, the other end of bent plate surrounds the annulus air chamber that can stop that light enters and can guide smog to enter fast, and the light path intersection point of infrared transmitting tube and infrared receiving tube places the center of described annulus air chamber.

The light path intersection point of infrared transmitting tube and infrared receiving tube is placed the center of annulus air chamber, and under the airflow plate central role that respectively is in the light, make air-flow in the sensing chamber, mix and by the anaclasis principle with smog, the air-flow that enters the sensing chamber is carried out the deflection of multiple angles, the smog miscarriage that enters the sensing chamber is given birth to, rotate, make smog concentrate on the sensing center around center, sensing chamber, make light be subjected to the existence of photoelectric receiving device perception smog, the sensitivity that has improved photoelectric sensing greatly.

The beneficial effect of above-mentioned design is that the smoke path of smoke alarm is designed to the magazine structure, the dome face that mainly is cover plate has the circular air intake window of the radial distribution in two roads and the window that is in the light, first road is the annular air intake window of radial distribution, smog around the periphery can be introduced transom window enters in the annulus air chamber smoothly, be located at the window that is in the light of inner ring, it forms the annulus air chamber by the angle block of right angle of arranging in the same direction that radially distributes, it only allows smog enter, and angle block of right angle stops that then light enters.Second road is that loam cake and lower cover surround middle cover up and down, and the transom window that smog can only be opened from the loam cake periphery enters, and the transom window by the middle cover periphery enters in the annulus air chamber that is surrounded by middle cover and wiring board again.Above-mentioned structural design comprises that infrared radiation is blocked in outside the magazine fully to the light of external environment basically, and the light of having eliminated environment disturbs, and reduces false alarm, has improved sensitivity and reliability.

Description of drawings

Fig. 1 is the utility model STRUCTURE DECOMPOSITION figure.

Fig. 2 is the magazine structural drawing.

Fig. 3 is A-A cut-open view of Fig. 2.

Embodiment

Referring to shown in Figure 1, loam cake 1 and middle cover 2 be fit mutually, and the air intake window around loam cake 1 end face is corresponding with the air intake window of middle cover 2 dome faces.Fixed head 4 is enclosed within the middle cover 2, wiring board 5 is located on the fixed head 4, infrared emission tube 25 and infrared receiving tube 26 are located in the rectangular box 6, and rectangular box 6 is little magazines of an opening of five face seals, an opening and corresponding with the infrared ray turnover slotted hole 3 on the fixed head 4 of rectangular box 6.Lower cover 7 becomes air-tight state with the side that bottom 8 is fixed on middle cover 2.Because the setting of rectangular box 6 stops entering of ambient infrared light, lower cover 7 stops also that with bottom 8 the environment infrared ray enters the chance of magazine from bottom.

Referring to shown in Figure 2, the outer ring of middle cover 2 is outwards tiltedly, inner ring is inside oblique scrobicular ring 24, establish some risers 21 that are radial arrangement in the scrobicular ring, riser is a modification of right-angled triangle plate, the hypotenuse of riser 21 is connected the top circular panel 23 of middle cover 2 with the interior scrobicular ring 24 of middle cover, the crack becomes strip parallel feed groove 27 between the riser 21, two right-angle sides of riser 21 are the annulus back up pad of cover plate 2 support, top circular panel 23, and it is corresponding with an end of angle block of right angle 22, the bent angle of angle block of right angle 22 is the right angle of arranging in the same direction, space 28 between the angle block of right angle 22 forms the passage that had both guided smog to enter, it is again the secret tunnel that stops that light enters, one end of angle block of right angle 22 surrounds and stops that light comprises the annulus air chamber 29 that infrared ray enters, and the other end of angle block of right angle 22 is for supporting the window frame of middle cover dome plate 23.The rectangular boxes 6 that are located at wiring board 5 centres pack in the oblong aperture 3 of fixed head 4 centres, and rectangular box 6 packs in the circular ring air cavity 29 again.From shown in Figure 2, infrared transmitting tube 25 is located in the same rectangular box 6 with infrared receiving tube 26, from shown in Figure 3, the infrared ray that infrared transmitting tube 25 sends enters in the annulus air chamber 29, the reflection that is subjected to entering smog in the annulus air chamber 29 is 90 degree refractions and enters in the infrared receiving tube 26, and infrared and receiving tube are the LED diode.The infrared ray that enters infrared receiving tube is to be launched by infrared transmitting tube fully; after the smog reflection, enter into infrared receiving tube; the light that environment is outer; comprise the airtight protection of infrared ray through rectangular box 6; stopping of the hermetically-sealed construction of middle cover and lower cover and angle block of right angle 22; be blocked isolation fully, do not disturb, prevent the generation of false alarm and can not produce to alarm.

Claims

1, magazine formula smoke alarm, it comprises loam cake (1), lower cover (7), bottom (8), wiring board (5) and be located at infrared transmitting tube (25) and infrared receiving tube (26) on the wiring board, it is characterized in that between loam cake (1) and lower cover (7), establishing middle cover (2), middle cover (2) surrounds the transom window that annulus distributes by dome face and some risers (21) that is radial setting, riser (21) lower end is corresponding with bent plate (22) one ends that bent angle is arranged in the same direction, the other end of bent plate (22) surrounds the annulus air chamber (29) that can stop that light enters and can guide smog to enter fast, and the light path intersection point of infrared transmitting tube (25) and infrared receiving tube (26) places the center of annulus air chamber.

2, magazine formula smoke alarm according to claim 1, the outer ring that it is characterized in that middle cover (2) for outwards tiltedly, inner ring is inside oblique scrobicular ring (24), establishes some right-angle triangle risers (21) that are radial arrangement in the scrobicular ring.

3, magazine formula smoke alarm according to claim 2, the hypotenuse that it is characterized in that the riser (21) of described right-angle triangle is connected the top circular panel (23) of middle cover (2) with the interior scrobicular ring (24) of middle cover (2), the crack becomes parallel long bar shaped air inlet duct (27) between the riser (21).

4, magazine formula smoke alarm according to claim 2 is characterized in that two right-angle sides of right-angle triangle riser (21) become the annulus back up pad of middle cover (2) support, top circular panel (23).

5, magazine formula smoke alarm according to claim 1, it is characterized in that with the riser corresponding bent plates of (21) one ends (22) be angle block of right angle, space (28) between the angle block of right angle (22) forms the passage that had both guided smog to enter, and is again the secret tunnel that stops that light enters.

6, magazine formula smoke alarm according to claim 1, it is characterized in that infrared receiving tube (26) and infrared transmitting tube (25) are located at five face seals, in the rectangular box (6) of an opening, the opening surface of rectangular box (6) is corresponding with the infrared ray manhole appendix (3) on the fixed head (4).