CN220105802U - Smoke chamber structure of point-type smoke-sensing fire detector and detector comprising same - Google Patents

Abstract

The utility model relates to the technical field of fire detectors, and particularly discloses a smoke chamber structure of a point-type smoke-sensing fire detector and a detector with the same. It comprises the following steps: the photoelectric seat and the shading chassis are oppositely arranged, a shading outer ring is arranged on the photoelectric seat, and a shading inner ring is arranged at one side, facing the shading outer ring, of the middle part of the shading chassis; the light shielding inner ring extends into the light shielding outer ring, a longitudinal gap for smoke to enter is reserved between the lower end of the light shielding outer ring and the light shielding chassis, and a transverse gap for smoke to enter is reserved between the light shielding outer ring and the light shielding inner ring; the photoelectric seat is transversely provided with a transmitting tube and a receiving tube, and the ray track of the transmitting tube, the ray track of the receiving tube and the intersection point of the two ray tracks are positioned on the same horizontal plane; the distance between the intersection point and the plane where the upper end part of the shading inner ring is positioned is reserved for smoke to flow through the intersection point for smoke sampling. The utility model simultaneously carries out smoke detection in two smoke inlet modes of diffuse smoke and air convection, so that the smoke detection sensitivity and the accuracy performance are greatly improved.

Description

Smoke chamber structure of point-type smoke-sensing fire detector and detector comprising same

Technical Field

The utility model relates to the technical field of fire detectors, and particularly discloses a smoke chamber structure of a point-type smoke-sensing fire detector and a detector with the same.

Background

The fire detector generally comprises a smoke detector and a temperature detector, wherein the smoke detector generally comprises a smoke chamber, a transmitting tube, a receiving tube, a circuit board and the like, and the smoke chamber is used as a smoke sampling and photoelectric detection area, so that the smoke detector has a light-proof effect and a smoke inlet effect, and has a particularly critical effect on the detection performance of the fire detector.

For example, a double-tube smoke detector maze disclosed in patent number CN214312002U comprises an upper shell, a lower shell, a transmitting tube and a receiving tube, wherein the upper shell is provided with a herringbone light blocking rib position, the herringbone light blocking rib position is arranged around the upper shell for a circle, the herringbone light blocking rib position enables indexes of smoke to be consistent, and the uniformity of detection is improved. For example, a smoke-sensing labyrinth and a smoke-sensing detector disclosed in CN211044476U include a labyrinth upper cover, a labyrinth base, a light emitting device and a light receiving device, wherein an L-shaped labyrinth member is disposed on the labyrinth base along the inner periphery of the bottom surface, and each L-shaped standing plate is arranged in a laminated manner, so that although there is a gap between the L-shaped standing plates, light cannot radiate in, and smoke particles can enter the smoke-sensing labyrinth and are protected from light.

Although these chevron shapes, L shape in the market can play good effect that shelters from external light for the detector maze has good darkroom effect, because these tortuous setting of shading components makes the air fluxion in the maze tobacco chamber relatively poor, and smog granule can only rely on diffuse mode to get into the tobacco chamber, and smog granule is difficult to get into the tobacco chamber smoothly in the first time, leads to the smog concentration sample in tobacco chamber to have the time delay nature, is unfavorable for fire detector's sensitivity, needs further improvement.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a smoke chamber structure of a point-type smoke-sensing fire detector and a detector with the same.

In one aspect, the utility model discloses a smoke chamber structure of a point-type smoke-sensing fire detector, which adopts the following technical scheme:

a smoke chamber structure of a point smoke-sensing fire detector, comprising: the photoelectric seat and the shading chassis are arranged in opposite directions, a shading outer ring is arranged on the photoelectric seat, and a shading inner ring is arranged at one side, facing the shading outer ring, of the middle part of the shading chassis; the light shielding inner ring stretches into the light shielding outer ring, a longitudinal gap a for smoke to enter is reserved between the lower end of the light shielding outer ring and the light shielding chassis, a transverse gap b for smoke to enter is reserved between the inner wall of the light shielding outer ring and the outer wall of the light shielding inner ring, and the longitudinal gap a is communicated with the transverse gap b; the photoelectric seat is transversely provided with a transmitting tube and a receiving tube, and the ray track of the transmitting tube, the ray track of the receiving tube and the intersection point of the two ray tracks are positioned on the same horizontal plane; and a distance from the intersection point to a plane where the upper end part of the shading inner ring is positioned is reserved between the intersection point and the plane where the smoke flows through the intersection point for smoke sampling.

Preferably, in the longitudinal section of the smoke chamber structure of the point smoke-sensing fire detector, at least a part of the shading outer ring is positioned on a connecting line from the periphery of the shading chassis to the upper end of the shading inner ring.

Preferably, the distance c from the intersection point to the plane where the upper end part of the light shielding inner ring is located is 1-10 mm, the distance d from the intersection point to the plane where the lower end part of the light shielding outer ring is located is 1-10 mm, and the value of c is smaller than the value of d.

Preferably, the ratio of the length of the longitudinal gap a to the length of the transverse gap b is 0.5 to 3.

Preferably, the ratio of the length of the transverse gap b to the distance c from the intersection point to the plane of the upper end part of the light shielding inner ring is 0.7-1.3.

Preferably, an insect-proof net is arranged around the periphery of the shading chassis.

Preferably, an annular step is arranged on the periphery of the shading outer ring, the insect-proof net cover is covered on the annular step, and the ratio of the distance e between the annular step and the plane where the lower end part of the shading outer ring is located and the distance f between the annular step and the shading chassis is 0.1-0.3.

Preferably, a plurality of smoke guide baffles are arranged in an annular space between the outer wall of the light shielding inner ring and the inner wall of the insect-proof net at intervals, and the annular space is partitioned by the smoke guide baffles to form a plurality of smoke inlet channels.

Preferably, the distance g from the ray junction point of the emitting tube and the receiving tube to the top wall of the photoelectric seat is 5 mm-22 mm.

On the other hand, the utility model also discloses a point type smoke-sensing fire detector, which comprises the smoke chamber structure of the point type smoke-sensing fire detector.

Compared with the prior art, the utility model at least comprises the following beneficial effects:

according to the smoke sampling cavity with the smoke chamber structure, the photoelectric seat, the light shielding outer ring, the light shielding chassis and the light shielding inner ring are arranged, the light shielding inner ring and the light shielding outer ring are matched, so that not only can a good light shielding effect be achieved, but also a good air convection effect can be formed in the smoke chamber, the smoke sampling speed is improved, meanwhile, the emission pipe and the receiving pipe are horizontally arranged, the ray intersection point of the emission pipe and the receiving pipe is positioned in the shortest path of air convection, so that smoke particles entering the smoke chamber can be detected more rapidly, and smoke detection is carried out in two smoke inlet modes of diffuse smoke and air convection, and the smoke detection sensitivity and the accuracy performance are greatly improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a smoke chamber structure of a spot smoke-sensing fire detector according to example 1;

FIG. 2 is a schematic illustration of the air convection path of the smoke cell structure of a point-type smoke-sensing fire detector according to example 1;

FIG. 3 is another angular schematic view of a smoke cell structure of a point-type smoke-sensing fire detector according to example 1;

FIG. 4 is a schematic view of the photoelectric seat of the smoke chamber structure of a point smoke-sensing fire detector in example 1;

FIG. 5 is a schematic view of a shading chassis of a smoke chamber structure of a spot smoke-sensing fire detector according to example 1;

FIG. 6 is a schematic cross-sectional view of a smoke chamber structure of a spot smoke-sensing fire detector according to example 2;

FIG. 7 is a schematic view of a photoelectric seat of a smoke chamber structure of a point type smoke-sensing fire detector according to example 2;

FIG. 8 is a schematic diagram of a point-type smoke-sensing fire detector according to example 3.

Reference numerals illustrate:

1. a photoelectric seat; 11. a light shielding outer ring; 12. a transmitting tube mounting seat; 13. a receiving tube mount; 14. an annular step; 2. a shading chassis; 21. a light shielding inner ring; 22. an insect-proof net; 23. a smoke guide baffle; 3. and (5) a junction point.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Example 1

The utility model provides a smoke chamber structure of some smoke and fire detector, as shown in fig. 1-5, it includes photoelectric seat 1 and shading chassis 2, photoelectric seat 1 and shading chassis 2 set up in opposite directions, integrated into one piece has shading outer lane 11 on the photoelectric seat 1, shading chassis 2 is towards one side integrated into one piece of shading outer lane 11 has shading inner circle 21, shading inner lane 11 diameter is less than shading outer lane 21's diameter, and shading inner lane 11 stretches into shading outer lane 21, i.e. the upper end open end of shading inner lane 21 stretches into in the lower extreme opening of shading outer lane 11, leave the longitudinal gap a that supplies smog to get into from the external world between shading outer lane 11 to shading chassis 2, leave the transverse gap b that supplies smog to get into between shading outer lane 11 and the shading inner lane 21, longitudinal gap a is linked together with transverse gap b.

The shading outer ring 11 of the photoelectric seat 1 is internally provided with a transmitting tube mounting seat 12 and a receiving tube mounting seat 13, the transmitting tube mounting seat 12 and the receiving tube mounting seat 13 are respectively provided with a transmitting tube and a receiving tube, the included angle between the transmitting optical axis of the transmitting tube and the receiving optical axis of the receiving tube is 125-145 degrees, the intersection point 3 of the transmitting optical axis of the transmitting tube and the receiving optical axis of the receiving tube is a detection source, the transmitting tube and the receiving tube are horizontally arranged, the ray track of the transmitting tube, the ray track of the receiving tube and the intersection point 3 of the ray track of the transmitting tube and the ray track of the receiving tube are in the same horizontal plane, and a distance for smoke to flow through the intersection point 3 for smoke sampling is reserved between the intersection point 3 of the ray track of the transmitting tube and the receiving tube and the plane of the upper end part of the shading inner ring 21.

The photoelectric seat 1, the shading outer ring 11, the shading chassis 2 and the shading inner ring 21 form a smoke sampling cavity of the smoke chamber structure, when a fire disaster occurs, smoke particles in the air can enter the cavity of the smoke chamber structure along the longitudinal gap a and the transverse gap b, so that the smoke particles are scattered after being irradiated by the transmitting tube, and then are captured and received by the receiving tube, and the purpose of detecting the smoke concentration is achieved. By utilizing the dislocation of the shading inner ring 21 and the shading outer ring 11 to block light, not only can a good shading effect be achieved, but also a good air convection effect is formed in the smoke chamber (as shown in an air flow path of fig. 2), the speed of external smoke entering the smoke chamber is improved, and therefore the smoke sampling speed of the smoke chamber structure is improved.

Specifically, referring to fig. 1, in the longitudinal section of the smoke chamber structure, at least a portion of the light shielding outer ring 11 is located on a line from the periphery of the light shielding chassis 2 to the upper end of the light shielding inner ring 21, so that when oblique light irradiates from the periphery of the light shielding chassis 2 towards the directions of the longitudinal gap a and the transverse gap b, the oblique light can only irradiate to the outer wall of the light shielding inner ring 21 after being shielded by the light shielding outer ring 11, thus further reducing the irradiation of external light, improving the darkroom effect, and enabling the transmitting tube mounting seat 12 and the receiving tube mounting seat 13 not to be close to the middle for avoiding the external light, thereby being capable of being arranged towards the edge of the photoelectric seat 1 and expanding the photoelectric detection area of the smoke chamber.

The distance c from the junction 3 to the plane of the upper end part of the light shielding inner ring 21 is 1 mm-10 mm, preferably 4.3 plus or minus 0.5mm, and the distance d from the junction 3 to the plane of the lower end part of the light shielding outer ring 11 is 1 mm-10 mm, preferably 6.6 plus or minus 0.5mm. The depth of inserting the light-shielding inner ring 21 into the light-shielding outer ring 11 is controlled in a reasonable range, so that the overlapping space of the air convection path and the detection junction 3 area is larger, smoke can enter the smoke chamber along the convection air better, and smoke particles can be detected more accurately and rapidly. In addition, the ratio of the length of the longitudinal gap a to the length of the transverse gap b is 0.5-3, preferably 2, which can facilitate the smooth flow of air and the convection of air. The ratio of the length of the transverse gap b to the distance c from the junction 3 to the plane of the upper end of the inner shading ring 21 is 0.7-1.3, preferably 1, so that the path width of the smoke particles can be kept close, and the smoke particles can be better detected through the junction 3.

Preferably, referring to fig. 1, 4 and 5, an insect-proof net 22 is arranged around the periphery of the shading chassis 2, an annular step 14 is arranged around the periphery of the shading outer ring 11, and the insect-proof net 22 covers the annular step 14, so that the effect of preventing insects from entering the smoke chamber by mistake to interfere with the detection result is achieved. In addition, a plurality of smoke guide baffles 23 are arranged in the annular space between the outer wall of the light shielding inner ring 21 and the inner wall of the insect-proof net 22 at intervals, and the smoke guide baffles 23 divide the transverse gaps b into a plurality of smoke inlet channels, as shown in fig. 5. In this embodiment, the smoke guide baffles 23 are eight equidistantly distributed, so that the design of the smoke guide baffles 23 helps to improve the consistency of azimuth response to smoke, and further improves the detection performance of the fire detector.

As the preferable scheme, the distance g from the ray junction 3 of the transmitting tube and the receiving tube to the top wall of the photoelectric seat 1 is 5 mm-22 mm, preferably 7mm, so that the interference of the reflected light generated by the top wall of the photoelectric seat 1 on smoke detection is effectively reduced, and the reliability of the smoke detector is improved.

Example 2

Embodiment 2 differs from embodiment 1 in that, referring to fig. 6, the annular step 14 is disposed on the peripheral wall of the light-shielding outer ring 11, and referring to fig. 7, the end of the light-shielding outer ring 11 is provided with a yielding gap for inserting the smoke guide baffle 23, so that the connection between the photoelectric seat 1 and the light-shielding chassis 2 is more stable, and further improvement of darkroom effect is facilitated. The ratio of the distance e from the annular step 14 to the plane where the lower end part of the light shielding outer ring 11 is located to the distance f from the annular step 14 to the light shielding chassis 2 is 0.1-0.3, and a specific ratio is more favorable for smoke particles to smoothly enter the smoke chamber, and excessive ratio can cause that part of the smoke particles entering the smoke inlet channel are blocked by the light shielding outer ring 11 when moving towards the cavity, and excessive ratio can reduce the space of the smoke inlet channel or other problems such as unstable installation.

Example 3

As shown in fig. 8, a spot-type smoke-sensing fire detector, which uses the smoke chamber structure described above, has the performance advantages of high smoke detection sensitivity and good accuracy.

The foregoing has outlined rather broadly the more detailed description of the utility model in order that the detailed description of the utility model that follows may be better understood, and in order that the present principles and embodiments may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.

Claims (10)

1. A smoke chamber structure of a point smoke-sensing fire detector, comprising: the photoelectric seat and the shading chassis are arranged in opposite directions, a shading outer ring is arranged on the photoelectric seat, and a shading inner ring is arranged at one side, facing the shading outer ring, of the middle part of the shading chassis; the light shielding inner ring stretches into the light shielding outer ring, a longitudinal gap a for smoke to enter is reserved between the lower end of the light shielding outer ring and the light shielding chassis, a transverse gap b for smoke to enter is reserved between the inner wall of the light shielding outer ring and the outer wall of the light shielding inner ring, and the longitudinal gap a is communicated with the transverse gap b; the photoelectric seat is transversely provided with a transmitting tube and a receiving tube, and the ray track of the transmitting tube, the ray track of the receiving tube and the intersection point of the two ray tracks are positioned on the same horizontal plane; and a distance from the intersection point to a plane where the upper end part of the shading inner ring is positioned is reserved between the intersection point and the plane where the smoke flows through the intersection point for smoke sampling.

2. A smoke cell structure of a spot fire detector according to claim 1, wherein in a longitudinal cross section of the smoke cell structure of the spot fire detector, at least a portion of the shade outer ring is located on a line from a periphery of the shade chassis to an upper end of the shade inner ring.

3. The smoke chamber structure of the point type smoke-sensing fire detector according to claim 1, wherein the distance c from the intersection point to the plane where the upper end part of the light shielding inner ring is located is 1-10 mm, the distance d from the intersection point to the plane where the lower end part of the light shielding outer ring is located is 1-10 mm, and the value of c is smaller than the value of d.

4. A smoke cell structure for a point type smoke-sensing fire detector according to claim 1, wherein the ratio of the length of the longitudinal gap a to the length of the transverse gap b is 0.5-3.

5. The smoke chamber structure of a point type smoke-sensing fire detector according to claim 1, wherein the ratio of the length of the transverse gap b to the distance c from the junction to the plane of the upper end of the light-shielding inner ring is 0.7-1.3.

6. The smoke chamber structure of a point type smoke-sensing fire detector according to claim 1, wherein the periphery of the shading chassis is provided with an insect-proof net.

7. The smoke chamber structure of the point type smoke-sensing fire detector according to claim 6, wherein an annular step is arranged on the periphery of the shading outer ring, the insect-proof net cover is covered on the annular step, and the ratio of the distance e from the annular step to the plane where the lower end part of the shading outer ring is located to the distance f from the annular step to the shading chassis is 0.1-0.3.

8. The smoke chamber structure of a point type smoke-sensing fire detector according to claim 6, wherein a plurality of smoke guide baffles are arranged in an annular space between the outer wall of the light shielding inner ring and the inner wall of the insect-proof net at intervals, and the annular space is partitioned by the smoke guide baffles to form a plurality of smoke inlet channels.

9. The smoke chamber structure of the point type smoke-sensing fire detector according to claim 1, wherein the distance g from the ray junction point of the emitting tube and the receiving tube to the top wall of the photoelectric seat is 5 mm-22 mm.

10. A detector comprising a smoke cell structure of a point-type smoke-sensitive fire detector according to any one of claims 1 to 9.