CN219891743U - Smoke sensing assembly and smoke sensing device - Google Patents

Abstract

The utility model relates to a smoke sensing assembly and a smoke sensing device, wherein the smoke sensing assembly comprises a signal source, a receiver and a container with an air chamber, and the signal source and the receiver are both arranged on the container; the container is also provided with a low-concentration gas passing channel and a high-concentration gas passing channel, and the low-concentration gas passing channel and the high-concentration gas passing channel are intersected with the gas chamber and respectively form an isolation area and a high-concentration area; the signal source is relatively far away from the high-concentration area and is used for emitting test light passing through the high-concentration area and comprises a signal emitting end positioned in the isolation area; and/or the receiver is disposed relatively far from the high concentration zone and participates in forming the inner side surface of the isolation zone. The utility model has the advantages that: the low impurity concentration gas in the low concentration gas passing channel can obstruct the smoke in the high concentration gas passing channel from contacting the signal transmitting end and/or the receiver, so that the scattered light received by the surface of the light receiver is prevented from being obviously reduced, and the sensitivity and the monitoring accuracy of the smoke sensing component to the smoke concentration are prevented from being obviously reduced.

Description

Smoke sensing assembly and smoke sensing device

Technical Field

The utility model relates to the technical field of smoke detection, in particular to a smoke sensing assembly and a smoke sensing device.

Background

The smoke detector is a fire early warning device for monitoring smoke by utilizing the scattering effect of smoke particles on light, and comprises a maze, and a light emitter and a light receiver which are arranged in the maze. The light emitter emits test light, the test light is scattered onto the light receiver after passing through a smoke area in the maze, and the light receiver receives the scattered light and converts an optical signal into an electrical signal. The higher the smoke concentration is, the more smoke particles are, and more test light is scattered to the light receiver, the stronger the electric signal on the light receiver is, and the smoke concentration can be judged by detecting the intensity of the electric signal.

The conventional smoke detector has the following problems: the high-concentration smoke containing a large amount of smoke particles formed when a fire occurs pollutes the light emitter and the light receiver after entering the maze, and the impurity particles entering the maze after long-time use pollutes the light emitter and the light receiver. Particles attached to the surface of the light emitter block the emission of the test light, particles attached to the surface of the light receiver block the light receiver from receiving the scattered light, both of which ultimately result in a reduction of the scattered light received by the surface of the light receiver. Wherein, scattered light received by the surface of the light receiver means: test light that is not blocked by the particles and is converted into an electrical signal by the light receiver. In the event that both the light emitter and the light receiver are contaminated, the sensitivity of the smoke detector to smoke concentration and monitoring accuracy can be significantly reduced.

Disclosure of Invention

Based on this, it is necessary to provide a smoke sensing assembly that addresses the above-described issues. The smoke sensing assembly can prevent the signal transmitting end and the receiver from contacting high-concentration smoke at the same time, so that scattered light received by the receiver is prevented from being obviously reduced, and further sensitivity and monitoring accuracy of the smoke sensing assembly to smoke concentration are prevented from being obviously reduced.

In order to solve the problems, the utility model provides the following technical scheme:

a smoke sensing assembly comprises a signal source, a receiver and a container with an air chamber, wherein the signal source and the receiver are arranged on the container; the container is also provided with a low-concentration gas passing channel and a high-concentration gas passing channel, and the low-concentration gas passing channel and the high-concentration gas passing channel are intersected with the gas chamber and respectively form an isolation area and a high-concentration area; the signal source is relatively far away from the high-concentration area and is used for emitting test light passing through the high-concentration area and comprises a signal emitting end positioned in the isolation area; and/or the receiver is disposed relatively far from the high concentration zone and participates in forming the inner side surface of the isolation zone.

In one embodiment, the signal transmitting end and the receiver are positioned at two sides of the high-concentration area, the number of the low-concentration gas passing channels is two, the two gas passing channels respectively intersect with the gas chamber to form a first isolation area and a second isolation area, the signal transmitting end is positioned in the first isolation area, and the receiver participates in forming the inner side surface of the second isolation area.

So set up, signal transmitting terminal and receiver all are located outside the high dense district, can not contact with the smog in the high dense district, this can guarantee that signal transmitting terminal and receiver keep sufficient cleanliness in longer time to guarantee sensitivity and the monitoring accuracy of smog sensing assembly to smog concentration.

In one embodiment, the container further comprises a first demarcation plate arranged between the signal source and the receiver, the first demarcation plate is provided with a first light through hole for communicating the high-concentration area with the second isolation area so as to allow the test light of the signal source to pass through, and the high-concentration area and the second isolation area are partially separated through the first demarcation plate.

This arrangement is advantageous in preventing smoke in the high concentration zone from diffusing to the second isolation zone and in maintaining cleanliness of the receiver surface.

In one embodiment, the side of the first demarcation plate facing the receiver is provided with a light absorbing projection.

So set up, when test light reflection to the extinction arch, the extinction arch can be with test light absorption to avoid test light to take place repeated reflection and influence the detection result.

In one embodiment, the chamber wall of the air chamber is provided with a high-concentration air inlet hole, a low-concentration air inlet hole and an air outlet hole, wherein the high-concentration air inlet hole is communicated with the air outlet hole and participates in forming a high-concentration air passing channel together, and the low-concentration air inlet hole is communicated with the air outlet hole and participates in forming a low-concentration air passing channel together.

So set up, smog can get into high-concentration gas passage from high-concentration inlet opening to discharge through the apopore. The test light emitted by the signal source is scattered by smoke particles in the high-concentration area, and part of the test light is reflected to the receiver, so that smoke detection is realized. The low-impurity-concentration gas can enter the low-concentration gas passing channel from the low-concentration air inlet hole and is discharged through the air outlet hole. The low impurity concentration gas flowing in the isolation region can prevent the smoke in the high concentration gas passage from contacting the signal source and/or the receiver.

In one embodiment, the low-concentration air inlet hole comprises a first air inlet hole, the air outlet hole comprises a first air outlet hole, the first air inlet hole is communicated with the first air outlet hole to form a first low-concentration air passing channel, the high-concentration air inlet hole is communicated with the first air outlet hole to form a high-concentration air passing channel, the first low-concentration air passing channel is intersected with the air chamber to form a first isolation area, and the signal transmitting end is located in the first isolation area.

By the arrangement, the first isolation area is filled with the low-impurity-concentration gas, so that smoke in the high-concentration area can be prevented from contacting the signal transmitting end.

In one embodiment, the low-concentration air inlet hole further comprises a second air inlet hole, the air outlet hole further comprises a second air outlet hole, the second air inlet hole is communicated with the second air outlet hole to form a second low-concentration air passing channel, the second low-concentration air passing channel is intersected with the air chamber to form a second isolation area, and the receiver participates in forming the inner side surface of the second isolation area.

By the arrangement, the smoke in the high-concentration area can be blocked from contacting the receiver by introducing the low-impurity-concentration gas into the second isolation area.

In one embodiment, the container is further provided with a filtering chamber, and the high-concentration gas passage is communicated with the filtering chamber and is intersected with the filtering chamber to form a coarse filtering chamber, and the smoke sensing assembly further comprises a coarse filtering piece filled in the coarse filtering chamber.

By means of the arrangement, the coarse filter can be used for coarse filtering of air and/or smoke, large-particle impurities in the air and/or smoke are filtered out, and only small particles containing smoke components are allowed to pass through. Thereby preventing the large particle impurities from gradually accumulating in the high-concentration gas passing channel and blocking the high-concentration gas passing channel.

In one embodiment, the low-concentration gas passage is communicated with the filtering chamber and is intersected with the low-concentration gas passage to form a fine filtering chamber, and the smoke sensing assembly further comprises a fine filtering piece filled in the fine filtering chamber, wherein the filtering grade of the fine filtering piece is higher than that of the coarse filtering piece.

So set up, the fine filtration spare can carry out fine filtration to smog, all filters out the granule that contains smog composition with the big granule impurity in the smog. Therefore, even if a fire disaster occurs, the air mixed with the smoke in the fire disaster site can be introduced into the fine filtering chamber, and the air enters the isolation area after being finely filtered by the fine filtering piece, so that the smoke in the high-concentration area is prevented from contacting the signal transmitting end and the receiver.

In one embodiment, the container further comprises a second dividing plate arranged in the filtering chamber, and the separation between the fine filtering chamber and the coarse filtering chamber is realized through the second dividing plate.

By the arrangement, the gas which is finely filtered by the fine filter piece can be prevented from being mixed into the high-concentration gas passage through the coarse filter piece, and the smoke in the high-concentration area is prevented from being diluted by the gas which is finely filtered by the fine filter piece to influence the smoke detection result.

In one embodiment, the container further has a light-absorbing chamber, which is located on the side of the receptacle facing away from the gas chamber, the inner wall of the light-absorbing chamber being provided with light-absorbing projections.

When no smoke exists in the high-concentration area, the test light emitted by the signal source enters the light absorption chamber, and then is reflected and absorbed by the light absorption bulge, so that the test light cannot reach the receiver under the condition that no smoke exists in the container, and false alarm is prevented; when smog exists in the high-concentration area, a part of test light is scattered and then enters the light absorption chamber instead of reaching the receiver, and the test light is reflected in the light absorption chamber and absorbed by the light absorption protrusions, so that the influence of repeated reflection of the test light on a detection result is avoided.

In one embodiment, the light-absorbing chamber includes a light-reflecting wall disposed obliquely with respect to the receiver, and further includes a light-absorbing wall, the light-absorbing protrusion being positioned on the light-absorbing wall, the light-reflecting wall and the light-absorbing wall forming an angle therebetween that allows light entering the light-absorbing chamber to reflect from the light-reflecting wall to the light-absorbing wall.

So set up, the light absorption protrusion on the light absorption wall can fully absorb the test light that gets into the light absorption room.

In one embodiment, the container is provided with a mounting hole, a pre-pressing force is arranged between the signal source and the hole wall of the mounting hole, an interference fit taking the axis of the mounting hole as a rotation center is formed, and the signal source and the hole wall of the mounting hole are relatively fixed through the pre-pressing force.

When the signal source is calibrated, the signal source can be rotated, so that the direction of test light emitted by the signal source is adjusted; after the calibration of the signal source is completed, the signal source is abutted and fixed by only stopping rotating the signal source, and the calibration result is maintained, so that the signal source is prevented from shifting after the calibration is completed to influence the smoke detection result of the smoke sensing assembly.

In one embodiment, the hole wall of the mounting hole is fixedly provided with a matching protrusion, and the matching protrusion is arranged around the axis of the mounting hole and is abutted against the peripheral side wall of the signal source.

So set up, area of contact is less when signal source periphery lateral wall and the protruding butt of cooperation, and this frictional force between signal source periphery lateral wall and the protruding of cooperation can be reduced, the in-process at the demarcation signal source is comparatively laborsaving rotatory signal source of being favorable to.

The utility model also provides a smoke sensing device which comprises the smoke sensing assembly.

The utility model has at least the following beneficial effects:

at least one of the signal transmitting end and the receiver of the signal source is positioned at a position relatively far away from the high-concentration area, and meanwhile, the low-impurity concentration gas in the low-concentration gas passing channel can block smoke in the high-concentration gas passing channel from contacting the signal transmitting end and/or the receiver, so that the accumulation amount and accumulation speed of impurity particles on the surface of the signal transmitting end and/or the receiver can be reduced, the smoke sensing component can keep the cleanliness of the signal transmitting end and/or the receiver for a longer time, scattered light received by the surface of the light receiver is prevented from being obviously reduced, the sensitivity and monitoring accuracy of the smoke sensing component to the smoke concentration are prevented from being obviously reduced, and the probability that the smoke sensing component cannot timely early warn of real fire is reduced.

Drawings

FIG. 1 is a schematic diagram of a smoke sensing assembly according to one embodiment of the utility model;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

fig. 3 is an enlarged schematic view at a in fig. 2.

Reference numerals:

1. a signal source; 11. a signal transmitting terminal; 2. a receiver; 3. a container; 31. a gas chamber; 311. an isolation region; 3111. a first isolation region; 3112. a second isolation region; 312. a high concentration zone; 32. a low-concentration gas passage; 321. a first low-concentration overgas passage; 3211. a first air inlet; 3212. a first air outlet hole; 322. a second low-concentration overgas passage; 3221. a second air inlet; 3222. a second air outlet hole; 33. a high-concentration gas passing channel; 331. high-concentration air inlet holes; 34. a first demarcation plate; 341. a first light through hole; 35. a filtering chamber; 351. a coarse filtration chamber; 352. a fine filtration chamber; 36. a second dividing plate; 37. a light absorbing chamber; 371. a reflective wall; 372. a light absorbing wall; 38. a mounting hole; 381. fitting the protrusion; 39. a mounting plate; 391. a second light through hole; 4. a light absorbing protrusion; 5. a coarse filter; 6. fine filter.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The smoke detector is a fire early warning device for monitoring smoke by utilizing the scattering effect of smoke particles on light, and comprises a maze, and a light emitter and a light receiver which are arranged in the maze. The light emitter emits test light, the test light is scattered onto the light receiver after passing through a smoke area in the maze, and the light receiver receives the scattered light and converts an optical signal into an electrical signal. The higher the smoke concentration is, the more smoke particles are, and more test light is scattered to the light receiver, the stronger the electric signal on the light receiver is, and the smoke concentration can be judged by detecting the intensity of the electric signal.

The conventional smoke detector has the following problems: the high-concentration smoke containing a large amount of smoke particles formed when a fire occurs pollutes the light emitter and the light receiver after entering the maze, and the impurity particles entering the maze after long-time use pollutes the light emitter and the light receiver. Particles attached to the surface of the light emitter block the emission of the test light, particles attached to the surface of the light receiver block the light receiver from receiving the scattered light, both of which ultimately result in a reduction of the scattered light received by the surface of the light receiver. Wherein, scattered light received by the surface of the light receiver means: test light that is not blocked by the particles and is converted into an electrical signal by the light receiver. In the event that both the light emitter and the light receiver are contaminated, the sensitivity of the smoke detector to smoke concentration and monitoring accuracy can be significantly reduced.

In order to solve the above problems, the present utility model provides a smoke sensing assembly capable of preventing a signal transmitting end 11 and a receiver 2 from simultaneously contacting high concentration smoke, thereby preventing scattered light received by the receiver 2 from being significantly reduced, and further preventing sensitivity and monitoring accuracy of the smoke sensing assembly to smoke concentration from being significantly reduced.

Referring to fig. 1 and 2, the smoke sensing assembly provided by the present utility model includes a signal source 1, a receiver 2 and a container 3, wherein the signal source 1 and the receiver 2 are both disposed in the container 3, the signal source 1 is used for emitting test light, and the receiver 2 is used for receiving test light. The container 3 has a plenum 31, and when smoke is present in the plenum 31 and test light emitted by the signal source 1 passes through the smoke, the smoke particles scatter the test light, a portion of which is scattered to the receiver 2. The higher the smoke concentration, the more smoke particles, and the more test light is scattered to the receiver 2.

Referring to fig. 1 and 2, the smoke sensor assembly further includes a high concentration gas passage 33, and the high concentration gas passage 33 intersects the gas chamber 31 to form a high concentration region 312, and the test light emitted from the signal source 1 passes through the high concentration region 312. When a fire occurs, smoke is generated, the smoke can enter the high-concentration area 312 through the high-concentration gas passing channel 33, part of the test light is scattered to the receiver 2 by smoke particles in the high-concentration area 312, and when the receiver 2 receives enough test light, the condition that the smoke concentration exceeds the normal range can be judged, and a fire possibly occurs.

Referring to fig. 1 and 2, the smoke sensing assembly further comprises a low-concentration gas passage 32, the low-concentration gas passage 32 intersecting the gas chamber 31 and forming an isolation zone 311.

In some embodiments, the signal source 1 includes a signal emitting end 11, and the test light emitted by the signal source 1 is emitted from the signal emitting end 11. The signal source 1 is relatively far away from the high concentration region 312, and the signal transmitting end 11 is located in the isolation region 311. When the smoke sensing assembly is used, low-concentration gas can be introduced into the low-concentration gas passing channel 32, so that smoke in the high-concentration region 312 is blocked, the smoke in the high-concentration region 312 is prevented from diffusing to be in contact with the signal transmitting end 11, more particles can be prevented from being attached to the signal transmitting end 11, scattered light received by the receiver 2 is prevented from being obviously reduced, and sensitivity of the smoke sensing assembly to the smoke concentration and monitoring accuracy are prevented from being obviously reduced.

While in other embodiments, the receiver 2 is disposed relatively far from the high concentration zone 312 and participates in forming the inside surface of the isolation zone 311. When the smoke sensing assembly is used, low-concentration gas can be introduced into the low-concentration gas passing channel 32, so that smoke in the high-concentration region 312 is blocked, the smoke in the high-concentration region 312 is prevented from diffusing to be in contact with the receiver 2, more particles can be prevented from being attached to the surface of the receiver 2, scattered light received by the receiver 2 is prevented from being obviously reduced, and sensitivity of the smoke sensing assembly to the smoke concentration and monitoring accuracy are prevented from being obviously reduced.

Of course, in other embodiments, it is also possible to have smoke from the high concentration zone 312 contact neither the signal emitting end 11 nor the receiver 2. Specifically, the signal source 1 and the receiver 2 are each disposed away from the high concentration region 312, the signal transmitting end 11 of the signal source 1 is located in the isolation region 311, and the receiver 2 participates in forming the inner side surface of the isolation region 311. When the smoke sensing component is used, low-concentration gas can be introduced into the low-concentration gas passing channel 32, so that smoke in the high-concentration region 312 is blocked, the smoke in the high-concentration region 312 is prevented from diffusing to be in contact with the signal transmitting end 11 and the receiver 2, more particles can be prevented from being attached to the surfaces of the signal transmitting end 11 and the receiver 2, scattered light received by the receiver 2 is prevented from being obviously reduced, and sensitivity of the smoke sensing component to the smoke concentration and monitoring accuracy are prevented from being obviously reduced.

It is understood that a low impurity concentration gas refers to a gas having a lower impurity concentration. Fine filtration of the air mixed with the smoke can obtain a gas with a low impurity concentration. By fine filtration is meant the filtration of large particulate impurities (e.g., dust, pollen) and small particles containing smoke constituents from the smoke. In addition, pure air may also be used as the low impurity concentration gas.

Referring to fig. 1 and 2, in some embodiments, the container 3 is further provided with a filtering chamber 35, the high concentration gas passage 33 is communicated with the filtering chamber 35 and is intersected with the filtering chamber 35 to form a coarse filtering chamber 351, and the smoke sensing assembly further comprises a coarse filtering member 5 filled in the coarse filtering chamber 351. Thus, the coarse filter 5 can coarsely filter air and/or smoke, and filter out large-particle impurities in the air and/or smoke, and only small particles containing smoke components can pass through. Thereby preventing large particle impurities from gradually accumulating in the high-concentration gas passing passage 33 to clog the high-concentration gas passing passage 33.

Further, referring to fig. 1 and 2, in some embodiments, the low-concentration gas passage 32 communicates with the filter chamber 35 and intersects therewith to form a fine filter chamber 352, and the smoke sensing assembly further includes a fine filter 6 filled in the fine filter chamber 352, the fine filter 6 having a higher filtration rating than the coarse filter 5. The fine filter 6 can finely filter the smoke, and both large particle impurities and small particles containing smoke components in the smoke are filtered out. In this way, even if a fire occurs, the air mixed with smoke in the fire scene can be introduced into the fine filter chamber 352, and the air is finely filtered by the fine filter 6 and then enters the isolation region 311, so that the smoke in the high concentration region 312 is blocked from contacting the signal transmitting end 11 and/or the receiver 2.

Further, referring to fig. 1 and 2, in some embodiments, the container 3 further includes a second dividing plate 36 mounted in the filter chamber 35, and the separation between the fine filter chamber 352 and the coarse filter chamber 351 is achieved by the second dividing plate 36. This prevents the gas finely filtered by the fine filter 6 from being mixed into the high-concentration gas passage 33 by the coarse filter 5, and prevents the smoke in the high-concentration region 312 from being diluted by the gas finely filtered by the fine filter 6 to affect the smoke detection result.

It will be appreciated that the coarse filter element 5 and the fine filter element 6 may be filter cotton or mesh of different filter grades, the fine filter element 6 having a higher filter grade than the coarse filter element 5.

It will be appreciated that in some embodiments, the filter chamber 35 may not include the coarse filter chamber 351 and the fume sensing assembly may not include the coarse filter 5, and fume may pass directly into the high concentration zone 312. The filter chamber 35 comprises only a fine filter chamber 352, the fine filter chamber 352 being filled with fine filter elements 6. The fine filter chamber 352 is supplied with gas, and the fine filter 6 finely filters the gas to obtain a gas having a low impurity concentration. The low impurity concentration gases enter the isolation region 311, which can block smoke in the high concentration region 312 from contacting the signal transmitting terminal 11 and/or the receiver 2.

In some embodiments, the smoke sensing assembly further comprises an alarm through which the smoke sensing assembly alerts a user that a fire may have occurred after the smoke sensing assembly detects that the smoke concentration exceeds the normal range. The alarm mode of the alarm can be sound alarm or flash alarm. In other words, the alarm may be a horn or an alarm lamp.

Referring to fig. 1 and 2, in some embodiments, the signal transmitting end 11 and the receiver 2 are located at two sides of the high concentration region 312, the number of low concentration gas passing channels 32 is two, the two low concentration gas passing channels 32 respectively intersect with the gas chamber 31 to form a first isolation region 3111 and a second isolation region 3112, the signal transmitting end 11 is located at the first isolation region 3111, and the receiver 2 participates in forming an inner side surface of the second isolation region 3112. The two low concentration gas passages 32 are filled with low impurity concentration gas, so that the smoke in the high concentration region 312 can be blocked from contacting the signal transmitting end 11 and the receiver 2. This ensures that the signal transmitting end 11 and the receiver 2 remain sufficiently clean for a longer period of time, thereby ensuring sensitivity of the smoke sensing assembly to smoke concentration and monitoring accuracy.

Further, referring to fig. 1 and 2, in some embodiments, the container 3 further includes a first dividing plate 34 disposed between the signal source 1 and the receiver 2, the first dividing plate 34 is provided with a first light through hole 341 that communicates the high concentration area 312 with the second isolation area 3112, so that the test light of the signal source 1 passes through, and the high concentration area 312 and the second isolation area 3112 are partially separated by the first dividing plate 34. This helps to prevent smoke from spreading in the high concentration zone 312 to the second isolation zone 3112 and helps to maintain cleanliness of the surface of the receiver 2.

Further, referring to FIGS. 1 and 2, in some embodiments, the side of the first demarcation plate 34 facing the receiver 2 is provided with a light absorbing protrusion 4. Even if there is no smoke in the high concentration area 312, in other words, even if the test light emitted from the signal source 1 is not scattered, the inner wall of the container 3 reflects the test light when the test light strikes the inner wall of the container 3. When the test light is reflected to the light absorption protrusion 4, the light absorption protrusion 4 can absorb the test light to avoid the repeated reflection of the test light to influence the detection result.

Referring to fig. 1 and 2, in some embodiments, the container 3 further has a light absorbing chamber 37, the light absorbing chamber 37 being located on a side of the receptacle 2 facing away from the gas chamber 31, the inner wall of the light absorbing chamber 37 being provided with light absorbing protrusions 4. When no smoke exists in the high-concentration area 312, after the test light emitted by the signal source 1 enters the light absorption chamber 37, the test light is reflected and absorbed by the light absorption protrusions 4, so that the test light cannot reach the receiver 2 under the condition that no smoke exists in the container 3, and false alarm is prevented; when smoke exists in the high concentration area 312, a part of the scattered test light does not reach the receiver 2 but enters the light absorption chamber 37, and the test light is reflected in the light absorption chamber 37 and absorbed by the light absorption protrusions 4, so that the repeated reflection of the test light is avoided to influence the detection result.

Further, referring to fig. 1 and 2, in some embodiments, the light-absorbing chamber 37 includes a light-reflecting wall 371 disposed obliquely with respect to the receiver 2, and further includes a light-absorbing wall 372, the light-absorbing protrusion 4 being positioned on the light-absorbing wall 372, the light-reflecting wall 371 forming an angle with the light-absorbing wall 372 that allows light entering the light-absorbing chamber 37 to reflect through the light-reflecting wall 371 to the light-absorbing wall 372. Thereby, the light-absorbing protrusions 4 on the light-absorbing wall 372 can sufficiently absorb the test light entering the light-absorbing chamber 37.

Optionally, in some embodiments, the container 3 comprises a mounting plate 39, the mounting plate 39 participating in forming the inner wall side of the isolation zone 311, and the receptacle 2 is mounted to the mounting plate 39. The mounting plate 39 is provided with a second light through hole 391, and the second light through hole 391 communicates the air chamber 31 with the light absorption chamber 37 so that the test light emitted by the signal source 1 enters the light absorption chamber 37 after passing through the air chamber 31. When no smoke exists in the high concentration area 312, the test light emitted by the signal source 1 directly enters the light absorption chamber 37 to be fully absorbed, and does not reach the receiver 2; when smoke exists in the high concentration area 312, the test light emitted by the signal source 1 is scattered by the smoke particles, a part of the test light is scattered to the receiver 2, the receiver 2 converts the optical signal into an electrical signal after receiving the test light, and the smoke concentration can be determined by detecting the intensity of the electrical signal.

Referring to fig. 1 and 2, in some embodiments, a chamber wall of the air chamber 31 is provided with a high-concentration air inlet 331, a low-concentration air inlet (not numbered in the figure) and an air outlet (not numbered in the figure), the high-concentration air inlet 331 is communicated with the air outlet and participates in forming the high-concentration air passing channel 33 together, and the low-concentration air inlet is communicated with the air outlet and participates in forming the low-concentration air passing channel 32 together. Thus, the smoke can enter the high-concentration air passage 33 from the high-concentration air inlet 331 and be discharged through the air outlet. The test light emitted by the signal source 1 is scattered by smoke particles in the high concentration area 312, and part of the test light is reflected to the receiver 2, so that smoke detection is realized. The low impurity concentration gas may enter the low concentration gas passage 32 from the low concentration gas inlet hole and be discharged through the gas outlet hole. The low impurity concentration gas flowing in the isolation region 311 can block the smoke in the high concentration gas passage 33 from contacting the signal transmitting end 11 and/or the receiver 2.

Further, referring to fig. 1 and 2, in some embodiments, the low-concentration air inlet includes a first air inlet 3211, the air outlet includes a first air outlet 3212, the first air inlet 3211 communicates with the first air outlet 3212 to form a first low-concentration air passage 321, the high-concentration air inlet 331 communicates with the first air outlet 3212 to form a high-concentration air passage 33, the first low-concentration air passage 321 intersects with the air chamber 31 to form a first isolation region 3111, and the signal transmitting end 11 is located in the first isolation region 3111. By introducing the low impurity concentration gas into the first isolation region 3111, the smoke in the high concentration region 312 is blocked from contacting the signal transmitting terminal 11, thereby preventing the smoke in the high concentration region 312 from contaminating the signal transmitting terminal 11.

Further, referring to fig. 1 and 2, in some embodiments, the low-concentration air intake further includes a second air intake 3221, the air outlet further includes a second air outlet 3222, the second air intake 3221 communicates with the second air outlet 3222 to form a second low-concentration air passage 322, the second low-concentration air passage 322 intersects the air chamber 31 to form a second isolation region 3112, and the receiver 2 participates in forming an inner side surface of the second isolation region 3112. The introduction of the low impurity concentration gas into the second isolation region 3112 can block the smoke in the high concentration region 312 from contacting the receiver 2, thereby preventing the smoke in the high concentration region 312 from contaminating the receiver 2.

The signal source 1 may be a laser which emits an elliptical laser beam. For embodiments employing a laser as the signal source 1, the signal source 1 needs to be calibrated during assembly of the smoke sensing assembly, specifically by rotating the laser to rotate the elliptical laser beam to an optimal position, so that the smoke sensing assembly achieves an optimal detection effect.

Referring to fig. 2 and 3, in some embodiments, the container 3 is provided with a mounting hole 38, and a pre-pressing force is provided between the signal source 1 and a hole wall of the mounting hole 38, and an interference fit using an axis of the mounting hole 38 as a rotation center is formed, and the signal source 1 and the hole wall of the mounting hole 38 are relatively fixed by the pre-pressing force. When the signal source 1 is calibrated, the signal source 1 can be rotated to rotate the elliptical laser beam to an optimal position; after the calibration of the signal source 1 is completed, the signal source 1 is abutted and fixed by only stopping rotating the signal source 1 and the hole wall of the mounting hole 38, so that the calibration result is maintained, and the signal source 1 is prevented from shifting after the calibration is completed to influence the smoke detection effect of the smoke sensing assembly.

Further, referring to fig. 2 and 3, in some embodiments, the wall of the mounting hole 38 is fixedly provided with a fitting protrusion 381, and the fitting protrusion 381 is disposed around the axis of the mounting hole 38 and abuts against the peripheral sidewall of the signal source 1. The contact area is smaller when the peripheral side wall of the signal source 1 is abutted against the matching protrusion 381, so that the friction force between the peripheral side wall of the signal source 1 and the matching protrusion 381 can be reduced, and the signal source 1 can be rotated in a labor-saving manner in the process of calibrating the signal source 1.

The utility model also provides a smoke sensing device which comprises the smoke sensing assembly. Through setting up foretell smoke sensing subassembly, this smoke sensing device can prevent that signal transmitting terminal 11 and receiver 2 from contacting high concentration smog simultaneously to prevent that receiver 2 received test light from showing to reduce, and then prevent that smoke sensing subassembly from showing to reduce to the sensibility and the monitoring accuracy of smog concentration.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (15)

1. The smoke sensing assembly is characterized by comprising a signal source (1), a receiver (2) and a container (3) with an air chamber (31), wherein the signal source (1) and the receiver (2) are both arranged on the container (3);

the container (3) is also provided with a low-concentration gas passing channel (32) and a high-concentration gas passing channel (33), the low-concentration gas passing channel (32) and the high-concentration gas passing channel (33) are all intersected with the air chamber (31) and form an isolation area (311) and a high-concentration area (312) respectively;

the signal source (1) is arranged relatively far away from the high-concentration area (312) and is used for emitting test light passing through the high-concentration area (312) and comprises a signal emitting end (11) positioned in the isolation area (311); and/or the receiver (2) is arranged relatively far from the high concentration zone (312) and participates in forming the inner side surface of the isolation zone (311).

2. The smoke sensing assembly according to claim 1, wherein said signal transmitting end (11) and said receiver (2) are located at two sides of said high concentration zone (312), said low concentration gas passing channels (32) are two in number, which respectively intersect said gas chamber (31) to form a first isolation zone (3111) and a second isolation zone (3112), said signal transmitting end (11) is located at said first isolation zone (3111), said receiver (2) is involved in forming an inner side surface of said second isolation zone (3112).

3. The smoke sensing assembly according to claim 2, wherein said container (3) further comprises a first demarcation plate (34) arranged between said signal source (1) and said receiver (2), said first demarcation plate (34) being provided with a first light through hole (341) communicating said high concentration zone (312) with said second isolation zone (3112) for the passage of test light of said signal source (1), said high concentration zone (312) being partially separated from said second isolation zone (3112) by said first demarcation plate (34).

4. A smoke sensing assembly according to claim 3, characterised in that the side of the first demarcation plate (34) facing the receiver (2) is provided with a light absorbing protrusion (4).

5. The smoke sensing assembly according to claim 1, wherein the chamber wall of the air chamber (31) is provided with a high-concentration air inlet hole (331), a low-concentration air inlet hole and an air outlet hole, the high-concentration air inlet hole (331) is communicated with the air outlet hole and participates in forming the high-concentration air passage (33), and the low-concentration air inlet hole is communicated with the air outlet hole and participates in forming the low-concentration air passage (32).

6. The smoke sensing assembly of claim 5 wherein said low concentration air inlet comprises a first air inlet (3211), said air outlet comprises a first air outlet (3212), said first air inlet (3211) communicates with said first air outlet (3212) to form a first low concentration air passage (321), said high concentration air inlet (331) communicates with said first air outlet (3212) to form said high concentration air passage (33), said first low concentration air passage (321) intersects with said air chamber (31) to form a first isolation zone (3111), said signal emitter (11) is located in said first isolation zone (3111).

7. The smoke sensing assembly of claim 6 wherein said low concentration air intake further comprises a second air intake aperture (3221), said air outlet aperture further comprises a second air outlet aperture (3222), said second air intake aperture (3221) in communication with said second air outlet aperture (3222) to form a second low concentration air passage (322), said second low concentration air passage (322) intersecting said air chamber (31) to form a second isolation zone (3112), said receiver (2) participating in forming an inside surface of said second isolation zone (3112).

8. A smoke sensing assembly according to claim 1, wherein the container (3) is further provided with a filter chamber (35), the high concentration gas passage (33) being in communication with the filter chamber (35) and intersecting therewith to form a coarse filter chamber (351), the smoke sensing assembly further comprising a coarse filter element (5) filling the coarse filter chamber (351).

9. The smoke sensing assembly according to claim 8, wherein said low concentration gas passage (32) communicates with said filter chamber (35) and intersects therewith to form a fine filter chamber (352), said smoke sensing assembly further comprising a fine filter (6) filling said fine filter chamber (352), said fine filter (6) having a higher filtration rating than said coarse filter (5).

10. The smoke sensing assembly according to claim 9, wherein said container (3) further comprises a second demarcation plate (36) mounted in said filter chamber (35), a separation between said fine filter chamber (352) and said coarse filter chamber (351) being achieved by said second demarcation plate (36).

11. A smoke sensing assembly according to claim 1, wherein the container (3) further has a light absorbing chamber (37), the light absorbing chamber (37) being located on a side of the receptacle (2) facing away from the air chamber (31), the inner wall of the light absorbing chamber (37) being provided with light absorbing protrusions (4).

12. The smoke sensing assembly according to claim 11, wherein said light absorbing chamber (37) comprises a light reflecting wall (371) arranged obliquely with respect to said receiver (2), further comprising a light absorbing wall (372), said light absorbing protrusion (4) being located at said light absorbing wall (372), said light reflecting wall (371) forming an angle with said light absorbing wall (372), said angle allowing light entering said light absorbing chamber (37) to be reflected by said light reflecting wall (371) to said light absorbing wall (372).

13. The smoke sensing assembly according to claim 1, wherein the container (3) is provided with a mounting hole (38), a pre-tightening pressure is arranged between the signal source (1) and the wall of the mounting hole (38), an interference fit taking the axis of the mounting hole (38) as a rotation center is formed, and the signal source (1) and the wall of the mounting hole (38) are relatively fixed through the pre-tightening pressure.

14. The smoke sensing assembly according to claim 13, wherein the wall of said mounting hole (38) is fixedly provided with a mating protrusion (381), said mating protrusion (381) being arranged around the axis of said mounting hole (38) and abutting against the peripheral side wall of said signal source (1).

15. A smoke sensing device comprising the smoke sensing assembly of any one of claims 1-14.