CN111951518A - Detection device for photoelectric smoke sensing - Google Patents

Abstract

The application relates to the technical field of fire detection devices, and discloses a photoelectric smoke sensing detection device which comprises a first cylinder body, a second cylinder body and a third cylinder body, wherein the top of the first cylinder body is closed, the bottom of the first cylinder body is provided with an opening, and a smoke inlet hole is formed in the circumferential direction of the first cylinder body; a second cylinder disposed in the first cylinder and located on the open side; the base is arranged below the first cylinder; the second cylinder, the base and all the light-shielding sheets define a cigarette collecting cavity together; a circuit board; a first emitter tube; a second launch tube; the first transmitting tube, the second transmitting tube and the photosensitive receiving tube are all connected with the circuit board, and the first transmitting tube, the second transmitting tube and the photosensitive receiving tube penetrate through the base and are arranged and face the inside of the smoke gathering cavity. The device can improve the sensitivity of smoke detection and the accuracy of smoke detection, and reduce the false alarm of a non-fire interference source.

Description

Detection device for photoelectric smoke sensing

Technical Field

The present application relates to the field of fire detection devices, for example to a detection device for photoelectric smoke sensing.

Background

In recent years, because fire disasters frequently occur, great loss is caused to life safety and property of people, and therefore, the key point for reducing the loss is to find the fire disasters and alarm in time. The basic principle of photoelectric smoke detectors is to detect the scattering of light by fire smoke particles. The particle size of the smoke is mostly in the range of 0.1-1 micron, the wavelength of a common emission tube is in the range of 460-940 nm, the scattering of the smoke particles conforms to the mie scattering principle, and the scattering parameter α ═ π d/λ is satisfied, wherein d represents the particle diameter and λ represents the wavelength of the incident light. It is known that the scattering intensity is proportional to the particle diameter and inversely proportional to the wavelength of the incident light. For the gray smoke particles with larger particles generated by the combustion of wood and cotton ropes, the light with red light and near infrared wave bands can be used for detection. For the black smoke with smaller particles generated by the combustion of polyurethane and n-heptane, the blue-violet light with short wavelength can be used for detection.

At present, the photoelectric smoke detector performs photoelectric detection on the premise that smoke is gathered inside the photoelectric smoke detector. Typically, a photoelectric smoke detector includes a base and a photoelectric detection assembly. The photoelectric detection component is arranged at the bottom of the base in a penetrating way. One side of base sets up a plurality of separation blades. All the blocking pieces are arranged on the inner wall of the base. Although all the blocking pieces have a certain guiding effect on external smoke, the flowing of the smoke is not directional, so that the external smoke cannot be effectively gathered inside the base by the existing blocking pieces, and the smoke detection sensitivity of the photoelectric smoke sensing detection device is affected.

Most photoelectric smoke sensing detection devices applied to the market adopt a single forward scattering labyrinth or a single backward scattering labyrinth, and a single light path is used for detecting and distinguishing black and white smoke particles, so that interference on non-fire factors such as large-particle dust or water mist and the like is difficult to eliminate. Some manufacturers also use a light path combining forward and backward scattering for smoke detection. The back scattering light path background light is large, and the scattering intensity of black and white smoke is weak, so that the accuracy of the photoelectric smoke detection device in the market is low.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a detection device for photoelectric smoke sensing to the sensitivity of photoelectric detection device smoke detection is improved to the effect of gathering together of reinforcing to external smog.

In some embodiments, the detection device for photoelectric smoke comprises: the first cylinder is closed at the top, is provided with an opening at the bottom and is circumferentially provided with a smoke inlet; a second cylinder disposed in the first cylinder and located on the open side; the base is arranged below the first cylinder; the second cylinder, the base and all the light-shielding sheets define a cigarette collecting cavity together; a circuit board; a first emitter tube; a second launch tube; the first transmitting tube, the second transmitting tube and the photosensitive receiving tube are all connected with the circuit board, and the first transmitting tube, the second transmitting tube and the photosensitive receiving tube penetrate through the base and are arranged and face the inside of the smoke gathering cavity.

The detection device for photoelectric smoke sensing provided by the embodiment of the disclosure can realize the following technical effects:

because a plurality of anti-dazzling screens set up in the top surface of base and radially arrange along the base, so, the smog that comes from different directions gets into first barrel inside through advancing the cigarette hole after, can follow near the center of same diffusion path entering base, has superior orientation uniformity. In addition, because the second barrel is located the below of the first barrel of top confined, the second barrel, base and all anti-dazzling screens inject jointly and are used for the smog to gather together and hold together the cigarette chamber, like this, the top and the bottom of holding together the cigarette chamber all seal, so, the smog that gets into near the center of base is by quick, effectively water conservancy diversion to this inside holding together the cigarette chamber, the reinforcing is to gathering together the effect of smog, more is favorable to first transmitting tube, second transmitting tube and photosensitive receiver tube to carry out photoelectric detection, improve the sensitivity of smog detection. Meanwhile, a first detection light path is formed by the first transmitting tube and the photosensitive receiving tube, a second detection light path is formed by the second transmitting tube and the photosensitive receiving tube, the two detection light paths jointly detect smoke entering the smoke holding cavity, and the first detection light path and the second detection light path are vertical forward scattering light paths. By analyzing and processing the two paths of detection signals received by the photosensitive receiving tube, black and white smoke particles with different particle diameters and a non-fire interference source can be identified, so that the discrimination capability of the detection device for photoelectric smoke sensing on smoke is improved, the detection precision is higher, and the misinformation of the non-fire interference source is reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of a detection device for sensing smoke by using a photoelectric sensor according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in the embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in the embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a first cylinder and a second cylinder provided by an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of another first cylinder and a second cylinder provided by the embodiment of the disclosure;

fig. 6 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in the embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in the embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in the embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in the embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of another detection device for sensing smoke by using a photoelectric sensor provided in an embodiment of the present disclosure.

Reference numerals:

1: a first cylinder; 2: a second cylinder; 3: a base; 4: a shading sheet; 11: opening the mouth; 1 a: a smoke inlet hole; 41: a first light shielding section; 42: a second light shielding section; 421: a guide section; 43: a third light-shielding section; 51: a first emitter tube; 52: a second launch tube; 53: a receiving tube; 6: a circuit board; 7: a light guide pillar; 100: a cigarette collecting cavity; 301: a first bracket; 302: a second bracket; 303: and a third bracket.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.

The term "plurality" means two or more unless otherwise specified.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

An exploded view of the detection device for photoelectric smoke detection is shown in fig. 1, and a cross-sectional view of the detection device for photoelectric smoke detection is shown in fig. 3. Fig. 6 is a perspective view of the detection device for photoelectric smoke detection. Referring to fig. 1, 3 and 6, an embodiment of the present disclosure provides a detection device for sensing photoelectric smoke, including a first cylinder 1, a second cylinder 2, a base 3, a circuit board 6, a first transmitting tube 51, a second transmitting tube 52 and a photosensitive receiving tube 53. The top of the first cylinder 1 is closed, and the bottom is provided with an opening 11. The first cylinder 1 is provided with smoke inlet holes 1a in the circumferential direction. The second cylinder 2 is arranged in the first cylinder 1 and is positioned at the side of the opening 11. The base 3 is arranged below the first cylinder 1. A plurality of light-shielding sheets 4 are arranged on the top surface of the base 3 and arranged along the radial direction of the base 3. The second cylinder 2, the base 3 and all the light-shielding sheets 4 define a cigarette collecting cavity 100 together. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are connected to the circuit board 6. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are arranged through the base 3 and face the inside of the cigarette collecting cavity 100.

By adopting the detection device for photoelectric smoke sensing provided by the embodiment of the disclosure, because the plurality of light shielding sheets are arranged on the top surface of the base and are arranged along the radial direction of the base, smoke from different directions can enter the vicinity of the center of the base along the same diffusion path after entering the first cylinder through the smoke inlet, and the detection device has excellent orientation consistency. In addition, because the second barrel is located the below of the first barrel of top confined, the second barrel, base and all anti-dazzling screens inject jointly and are used for the smog to gather together and hold together the cigarette chamber, like this, the top and the bottom of holding together the cigarette chamber all seal, so, the smog that gets into near the center of base is by quick, effectively water conservancy diversion to this inside holding together the cigarette chamber, the reinforcing is to gathering together the effect of smog, more is favorable to first transmitting tube, second transmitting tube and photosensitive receiver tube to carry out photoelectric detection, thereby improve the sensitivity of smog detection. Meanwhile, a first detection light path is formed by the first transmitting tube and the photosensitive receiving tube, a second detection light path is formed by the second transmitting tube and the photosensitive receiving tube, the two detection light paths jointly detect smoke entering the smoke holding cavity, and the first detection light path and the second detection light path are vertical forward scattering light paths. By analyzing and processing the two paths of detection signals received by the photosensitive receiving tube, black and white smoke particles with different particle diameters and a non-fire interference source can be identified, so that the discrimination capability of the detection device for photoelectric smoke sensing on smoke is improved, the detection precision is higher, and the misinformation of the non-fire interference source is reduced.

Optionally, the first emitting tube 51 is a red emitting tube or an infrared emitting tube. The second emission tube 52 is a blue light emission tube or a violet light emission tube. Therefore, the first transmitting tube and the receiving tube form a first detection light path, and the second transmitting tube and the receiving tube form a second detection light path, so that detection of different types of smoke can be realized, and balanced response of different types of smoke can be realized. In practical application, the first emission tube and the second emission tube are emission tubes with two different wavelengths. The first emission tube was selected to be a 940 nm infrared emission tube and the second emission tube was selected to be a 460 nm blue emission tube. The receiving tube is a wide-spectrum receiving tube matched with the first transmitting tube and the second transmitting tube.

Optionally, the base 3 is detachably disposed below the first barrel 1. Thus, the assembly is convenient and the maintenance or replacement of the components is convenient.

Optionally, the base 3 is in snap connection, threaded connection or bonded connection with the first cylinder 1. Like this, can realize the quick assembly disassembly of base and first barrel.

Referring to fig. 2 and 3, an embodiment of the present disclosure provides a detection device for detecting photoelectric smoke, including a first cylinder 1, a second cylinder 2, a base 3, a circuit board 6, and a photoelectric smoke detection assembly. The top of the first cylinder 1 is closed, and the bottom is provided with an opening 11. The first cylinder 1 is provided with smoke inlet holes 1a in the circumferential direction. The second cylinder 2 is arranged in the first cylinder 1 and is positioned at the side of the opening 11. The base 3 is arranged below the first cylinder 1. A plurality of light-shielding sheets 4 are arranged on the top surface of the base 3 and arranged along the radial direction of the base 3. The second cylinder 2, the base 3 and all the light-shielding sheets 4 define a cigarette collecting cavity 100 together. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are connected to the circuit board 6. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are arranged through the base 3 and face the inside of the cigarette collecting cavity 100. Each of the light-shielding sheets 4 includes a first light-shielding section 41 and a second light-shielding section 42. The first light shielding section 41 is located at the edge of the base 3 and abuts against the inner wall of the first cylinder 1. The second light shielding section 42 is located inside the first light shielding section 41 and connected to the first light shielding section 41. The second light shielding section 42 faces the center of the base 3. The second cylinder 2 abuts against the second light shielding section 42.

Adopt the detection device for cigarette is felt to photoelectricity that this disclosed embodiment provided, smog can follow near the center that first shading section and the second shading section of arbitrary adjacent shading piece got into the base, because first shading section supports and leans on in the inner wall of first barrel, the second barrel supports and leans on the second shading section, so, the second barrel, base and all first shading sections and all second shading sections inject the chamber of holding together that is used for smog to gather together jointly, avoid getting into the inside smog of first barrel through advancing the cigarette hole and producing the diffusion, further promote smog and gather together the effect, improve this a detection device for cigarette is felt to photoelectricity's sensitivity.

Alternatively, as shown in fig. 2, all the second light shielding sections 42 are located on a plane intersecting the axis of the base 3. Wherein the axis of the base 3 is perpendicular to the top surface of the base 3. Therefore, after the smoke passes through the adjacent first light shielding sections, the planes of all the second light shielding sections intersect with the axis of the base, so that the smoke from different directions can enter the vicinity of the center of the base along the same diffusion path, and the detection device for photoelectric smoke sensing has excellent orientation consistency.

Alternatively, all the first light shielding sections 41 are located on a plane perpendicular to the top surface of the base 3. Therefore, smoke enters the position near the center of the base along the adjacent first shading section, and the direction consistency is excellent.

Optionally, the top surface of the base 3 is provided with a light guide post 7. The light guide column 7 is located at the first shading section 41 of any shading sheet 4 and penetrates through the first cylinder 1 to be communicated with the outside. The light guide column 7 penetrates through the base 3 and is connected with the circuit board 6. Therefore, under the condition that the smoke concentration obtained by smoke detection exceeds the preset concentration value, the light guide column emits light to realize alarm prompt.

Referring to fig. 2 and 3, an embodiment of the present disclosure provides a detection device for detecting photoelectric smoke, including a first cylinder 1, a second cylinder 2, a base 3, a circuit board 6, and a photoelectric smoke detection assembly. The top of the first cylinder 1 is closed, and the bottom is provided with an opening 11. The first cylinder 1 is provided with smoke inlet holes 1a in the circumferential direction. The second cylinder 2 is arranged in the first cylinder 1 and is positioned at the side of the opening 11. The base 3 is arranged below the first cylinder 1. A plurality of light-shielding sheets 4 are arranged on the top surface of the base 3 and arranged along the radial direction of the base 3. The second cylinder 2, the base 3 and all the light-shielding sheets 4 define a cigarette collecting cavity 100 together. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are connected to the circuit board 6. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are arranged through the base 3 and face the inside of the cigarette collecting cavity 100. Each of the light-shielding sheets 4 includes a first light-shielding section 41 and a second light-shielding section 42. The first light shielding section 41 is located at the edge of the base 3 and abuts against the inner wall of the first cylinder 1. The second light shielding section 42 is located inside the first light shielding section 41 and connected to the first light shielding section 41. The second light shielding section 42 faces the center of the base 3. The second cylinder 2 abuts against the second light shielding section 42. The second light shielding section 42 of the partial light-shielding sheet 4 includes a guide section 421. The guiding section 421 is disposed inside the second light shielding section 42. The height of the guide section 421 is less than that of the second light shielding section 42. The second cylinder 2 abuts against the top of the guide section 421.

Adopt the detection device for photoelectric smoke sensing that this disclosed embodiment provided, because the height that highly is less than the second shading section of direction section, so, get into the smog of holding together the cigarette chamber and for receiving the separation of direction section to, the direction section can not produce the smog yet and block, more is favorable to smog to be surveyed.

Optionally, the front end surface of the guiding segment 421 is a slope. Wherein, the preceding terminal surface of guide section indicates the face of guide section towards the axis of base. Therefore, the orientation consistency of the detection device for photoelectric smoke sensing is further improved.

Optionally, as shown in fig. 3, a cross section of any of the light-shielding sheets 4 is Y-shaped. Thus, external stray light can be prevented from entering. Meanwhile, the light emitted by the first emission tube and the light emitted by the second emission tube are reflected for multiple times, so that the intensity of the light after multiple reflections is reduced.

Optionally, as shown in fig. 2, at least 3 light-shielding sheets 4 with the guide segments 421 are uniformly arranged along the radial direction of the base 3. Thus, the second cylinder can be stably arranged above the light shielding sheet, and the stability of the detection device for photoelectric smoke is improved.

Optionally, the number of the light-shielding sheets 4 provided with the guide segments 421 is 8, and the light-shielding sheets are uniformly arranged along the radial direction of the base 3. Therefore, all the light-shielding sheets form an optical maze, and smoke can be quickly guided into the smoke collecting cavity. Meanwhile, 8 light-shielding sheets with guide sections enable smoke to enter the smoke collecting cavity from different directions along the same track, and the directivity of the optical maze is guaranteed.

Referring to fig. 2, an embodiment of the present disclosure provides a detection device for detecting a photoelectric smoke, including a first cylinder 1, a second cylinder 2, a base 3, a circuit board 6, and a photoelectric smoke detection assembly. The top of the first cylinder 1 is closed, and the bottom is provided with an opening 11. The first cylinder 1 is provided with smoke inlet holes 1a in the circumferential direction. The second cylinder 2 is arranged in the first cylinder 1 and is positioned at the side of the opening 11. The base 3 is arranged below the first cylinder 1. A plurality of light-shielding sheets 4 are arranged on the top surface of the base 3 and arranged along the radial direction of the base 3. The second cylinder 2, the base 3 and all the light-shielding sheets 4 define a cigarette collecting cavity 100 together. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are connected to the circuit board 6. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are arranged through the base 3 and face the inside of the cigarette collecting cavity 100. Each of the light-shielding sheets 4 includes a first light-shielding section 41 and a second light-shielding section 42. The first light shielding section 41 is located at the edge of the base 3 and abuts against the inner wall of the first cylinder 1. The second light shielding section 42 is located inside the first light shielding section 41 and connected to the first light shielding section 41. The second light shielding section 42 faces the center of the base 3. The second cylinder 2 abuts against the second light shielding section 42. A third light shielding section 43 is arranged at the joint of the first light shielding section 41 and the second light shielding section 42, and an acute angle is formed between the third light shielding section 43 and the inner wall of the second cylinder 2. The second cylinder 2 abuts against the second light shielding section 42.

By adopting the detection device for photoelectric smoke sensing provided by the embodiment of the disclosure, smoke entering the base through the smoke inlet hole is prevented from flowing back to the outside of the first barrel, so that the smoke flowing to the vicinity of the center of the base in a one-way manner after passing through the smoke inlet hole as much as possible is prevented.

Alternatively, as shown in fig. 4 and 5, the base 3 has a circular plate shape. The second cylinder 2 is coaxial with the first cylinder 1 and with the base 3. Therefore, the contact area between the first cylinder and the outside can be increased, and smoke flows into the base after passing through the smoke inlet holes as much as possible. Meanwhile, the second cylinder is coaxial with the first cylinder, so that smoke can enter the position near the center of the base at any angle, and the sensitivity of smoke detection is improved.

Optionally, as shown in fig. 5, the smoke inlet holes 1a are arranged in an array in the circumferential direction of the first cylinder 1. Like this, because smog flows and has the uncertainty, through arranging the smoke inlet in the circumference of first barrel 1 with the array, makes the smog that comes from arbitrary direction all can pass through inside getting into first barrel, on the basis of improving the sensitivity that smog detected, improves the commonality that smog detected.

Optionally, the smoke inlet 1a is a square hole. Therefore, the particle smoke can enter the smoke collecting cavity conveniently.

Optionally, as shown in fig. 5, the top wall and/or the side wall of the second cylinder 2 is provided with a conical convex stripe. Thus, the absorption effect of the stray light of the background is enhanced, and the elimination of the stray light is facilitated.

Optionally, the top wall and/or the side wall of the second cylinder 2 is provided with a conical convex stripe. Thus, the absorption effect of the stray light of the background is enhanced, and the elimination of the stray light is facilitated.

Referring to fig. 7, an embodiment of the present disclosure provides a detection device for detecting a photoelectric smoke, including a first cylinder 1, a second cylinder 2, a base 3, a circuit board 6, and a photoelectric smoke detection assembly. The top of the first cylinder 1 is closed, and the bottom is provided with an opening 11. The first cylinder 1 is provided with smoke inlet holes 1a in the circumferential direction. The second cylinder 2 is arranged in the first cylinder 1 and is positioned at the side of the opening 11. The base 3 is arranged below the first cylinder 1. A plurality of light-shielding sheets 4 are arranged on the top surface of the base 3 and arranged along the radial direction of the base 3. The second cylinder 2, the base 3 and all the light-shielding sheets 4 define a cigarette collecting cavity 100 together. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are connected to the circuit board 6. The first transmitting tube 51, the second transmitting tube 52 and the photosensitive receiving tube 53 are arranged through the base 3 and face the inside of the cigarette collecting cavity 100. Each of the light-shielding sheets 4 includes a first light-shielding section 41 and a second light-shielding section 42. The first light shielding section 41 is located at the edge of the base 3 and abuts against the inner wall of the first cylinder 1. The second light shielding section 42 is located inside the first light shielding section 41 and connected to the first light shielding section 41. The second light shielding section 42 faces the center of the base 3. The second cylinder 2 abuts against the second light shielding section 42. The axis of the first transmitting tube 51 and the axis of the photosensitive receiving tube 53 form an obtuse angle a. The axis of the second transmitting tube 52 is at an obtuse angle b (not shown) with respect to the axis of the photosensitive receiving tube 53. The first transmitting tube 51 and the photosensitive receiving tube 53 form a first forward scattering detection optical path, and the second transmitting tube 52 and the photosensitive receiving tube 53 form a second forward scattering detection optical path. Referring to fig. 8, the projection of the axis of the first transmitting tube 51 along the base 3 is collinear with the projection of the axis of the photosensitive receiving tube 53 along the base 3.

By adopting the detection device for photoelectric smoke sensing provided by the embodiment of the disclosure, the first transmitting tube adopts the infrared transmitting tube, the first transmitting tube and the photosensitive receiving tube form the first detection light path, the second transmitting tube adopts the blue light transmitting tube, and the second transmitting tube and the receiving tube form the second detection light path. Because the detection angles of the two detection light paths are different, the detection light with infrared light and blue light with different wavelengths is respectively adopted, and a and b are obtuse angles, the projection of the axis of the first transmitting tube along the base is collinear with the projection of the axis of the photosensitive receiving tube along the base, and the two detection signals received by the photosensitive receiving tube are analyzed and processed, so that black and white smoke particles with different particle sizes and a non-fire interference source can be identified, the discrimination capability of smoke is improved, the detection precision is higher, and the misinformation of the non-fire interference source can be reduced.

Alternatively, the first emission tube 51 is an infrared emission tube. The second emission tube 52 employs a blue emission tube or an ultraviolet emission tube. Wherein the wavelength of light wave corresponding to the infrared emission tube is 850 nm-1050 nm. The wavelength of light wave corresponding to the blue light emitting tube is 400 nm-480 nm. The wavelength corresponding to the ultraviolet emission tube is 250 nm-400 nm. Wherein nm is a length measurement unit and represents nanometer.

Optionally, the first emission tube 51 is a blue light emission tube or an ultraviolet emission tube, and the second emission tube 52 is an infrared emission tube.

Alternatively, the axis of the first transmitting tube 51, the axis of the second transmitting tube 52 and the axis of the photosensitive receiving tube 53 intersect at the axis of the base 3. Therefore, the discrimination capability of the smoke is further improved, and the detection precision is further improved.

Optionally, a is more than or equal to 100 degrees and less than or equal to 140 degrees, and b is more than or equal to 100 degrees and less than or equal to 140 degrees.

Alternatively, as shown in fig. 8 and 9, 20 ° < α ═ β ═ γ <30 °. Where α denotes an angle between the axis of the first transmitting tube 51 and the top surface of the base 3, β denotes an angle between the axis of the second transmitting tube 52 and the top surface of the base 3, and γ denotes an angle between the axis of the photosensitive receiving tube 53 and the top surface of the base 3. Therefore, external stray light can be effectively prevented from entering the smoke gathering cavity, the influence of the external stray light on the scattering of smoke by the first detection light path and the second detection light path is reduced, and the detection precision of the photoelectric smoke sensing detection device is improved.

Alternatively, as shown in fig. 10, the base 3 includes a first bracket 301, a second bracket 302, and a third bracket 303. The first emission pipe 51 is disposed inside the first bracket 301. The second launch tube 52 is disposed within the second support 302. The third support 303 is provided with a photosensitive receiving tube 53 inside. The first bracket 301, the second bracket 302 and the third bracket 303 are all disposed on the base 3 in a penetrating manner. Like this, through first support, second support and third support with first transmitting tube, second transmitting tube and photosensitive receiving tube steadily be fixed in the framework bottom, improve the firm degree of this a detection device for photoelectric smoke sensing's structure.

Optionally, an included angle between the axis of the first emission tube and the axis of the second emission tube is greater than 0 ° and less than or equal to 40 °. Therefore, the light emitted by the first emission tube and the second emission tube is approximately towards the photosensitive receiving tube, and the detection precision of the detection device for the photoelectric smoke is further improved.

Optionally, the included angle between the axis of the first emission tube and the axis of the second emission tube is greater than 25 ° and less than or equal to 35 °. Therefore, the light emitted by the first emission tube and the light emitted by the second emission tube are both towards the photosensitive receiving tube, and the detection precision of the detection device for the photoelectric smoke is further improved.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (15)

1. A detection device for photoelectric smoke sensing, comprising:

the first cylinder is closed at the top, is provided with an opening at the bottom and is circumferentially provided with a smoke inlet;

a second cylinder disposed in the first cylinder and located on the open side;

the base is arranged below the first cylinder;

the second cylinder, the base and all the light-shielding sheets define a cigarette collecting cavity together;

a circuit board;

a first emitter tube;

a second launch tube;

the first transmitting tube, the second transmitting tube and the photosensitive receiving tube are all connected with the circuit board, and the first transmitting tube, the second transmitting tube and the photosensitive receiving tube penetrate through the base and are arranged and face the inside of the smoke gathering cavity.

2. The apparatus of claim 1, wherein each louver comprises:

the first shading section is positioned at the edge of the base and is abutted against the inner wall of the first cylinder;

and the second shading section is positioned on the inner side of the first shading section, is connected with the first shading section and faces the center of the base, and the second cylinder body is abutted against the second shading section.

3. The device of claim 2, wherein the planes of all the second light-shielding sections intersect the axis of the base; wherein the axis of the base is perpendicular to the top surface of the base.

4. The device of claim 3, wherein all of the first light-shielding segments are disposed in a plane perpendicular to the top surface of the base.

5. The apparatus of claim 2, wherein the second light-shielding segment of the partial light-shielding sheet comprises:

the guide section is arranged on the inner side of the second shading section, the height of the guide section is smaller than that of the second shading section, and the second cylinder body is abutted against the top of the guide section.

6. The apparatus as claimed in claim 5, wherein the number of the light-shielding sheets provided with the guide sections is at least 3 and is uniformly arranged in a radial direction of the base.

7. The device of any one of claims 2 to 6, wherein a third light shielding section is arranged at the joint of the first light shielding section and the second light shielding section, and the third light shielding section forms an acute angle with the inner wall of the second cylinder.

8. The device according to any one of claims 1 to 6, characterized in that said base is in the form of a circular plate, said second cylinder being coaxial with said first cylinder and with said base.

9. The device of any one of claims 1 to 6, wherein the smoke inlet holes are arranged in an array in the circumferential direction of the first cylinder.

10. The device according to any one of claims 1 to 6, wherein the top wall and/or the side wall of the second cylinder is provided with tapered striations.

11. The device according to any one of claims 1 to 6, wherein the included angle a between the axis of the first transmitting tube and the axis of the photosensitive receiving tube is an obtuse angle; an included angle b between the axis of the second transmitting tube and the axis of the photosensitive receiving tube is an obtuse angle;

wherein a projection of an axis of the first transmitting tube along the base is collinear with a projection of an axis of the photosensitive receiving tube along the base.

12. The apparatus of claim 11, wherein the axis of the first transmitting tube, the axis of the second transmitting tube and the axis of the photosensitive receiving tube intersect at the axis of the base.

13. The device according to claim 12, characterized in that 20 ° < α ═ β ═ γ <30 °;

wherein, α represents an included angle between the axis of the first transmitting tube and the top surface of the base, β represents an included angle between the axis of the second transmitting tube and the top surface of the base, and γ represents an included angle between the axis of the photosensitive receiving tube and the top surface of the base.

14. The apparatus of claim 11, wherein the base comprises:

the first support is internally provided with the first transmitting tube;

the second support is internally provided with the second transmitting tube;

the third bracket is internally provided with the photosensitive receiving tube;

wherein, first support, second support and third support all run through set up in the base.

15. The apparatus of claim 11, wherein the axis of the first emitter tube is at an angle greater than 0 ° and less than or equal to 40 ° to the axis of the second emitter tube.

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