CN218100392U

CN218100392U - Smoke sensor

Info

Publication number: CN218100392U
Application number: CN202222433818.5U
Authority: CN
Inventors: 杨玉海; 陈珍强
Original assignee: Suzhou Industrial Park Trans Automobile Electronics Co ltd
Current assignee: Suzhou Industrial Park Trans Automobile Electronics Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2022-12-20
Anticipated expiration: 2032-09-14

Abstract

The utility model relates to a smoke transducer, a base and a shell form a detection gas cavity, a circuit board is arranged on the back of the base, the circuit board is encapsulated into a whole by a sealing plate, holes are arranged on the circuit board, and a detection gas flow passage is formed; a lower emitting structure and a lower receiving structure are arranged beside a detection gas flow passage on the base, an upper emitting structure matched with the lower emitting structure is arranged at the position, which is opposite to the lower emitting structure, on the shell, and the emitting element is horizontally arranged in the lower emitting structure; the position of the shell opposite to the lower receiving structure is provided with an upper receiving structure matched with the lower receiving structure to form a closed receiving darkroom, the receiving element is horizontally arranged in the lower receiving structure, and the front end of the receiving element is provided with a light-gathering optical component; a first positioning piece and a first fixing piece for positioning and fixing the transmitting element are arranged in the lower transmitting structure; a second positioning part and a second fixing part for positioning and fixing the receiving element are arranged in the lower receiving structure. The transmitting element and the receiving element are accurately positioned and fixed, and the receiving darkroom is closed, so that the receiving element is prevented from interfering the influence of light, and the detection precision is improved.

Description

Smoke sensor

Technical Field

The utility model relates to a smoke transducer, concretely relates to photoelectric smoke transducer.

Background

Smoke sensors are generally used in open light situations, for example, chinese patent application No. 2020106988828.4 discloses a smoke detection darkroom, on one hand smoke can enter the detection darkroom faster, on the other hand external light cannot enter.

A smoke sensor needs to be installed on the lithium battery pack for the new energy vehicle for early warning of thermal runaway. For this application, the smoke sensor is used for smoke sensing in a dark environment, and compared with the prior art, interference of external light on a sensor signal does not need to be considered. Thus, the problem is mainly how to form optical traps. The optical trap can prevent external light from reaching the photosensitive LED and causing interference on the output of the sensor, and on the other hand, when smoke does not exist, the light emitted by the emitting LED must enter the optical trap and cannot reach the photosensitive LED; in a detection darkroom formed by the optical trap, once smoke enters, due to scattering of the smoke, an original light propagation path is changed, so that light can be detected by the photosensitive LED, the larger the light intensity received by the photosensitive LED is, the larger the generated electric signal is, the larger the light intensity is, the light intensity is in direct proportion to smoke concentration, and a smoke concentration signal can be obtained by calibrating the electric signal.

The photosensitive LED is arranged in the optical darkroom, and once interference light enters the optical darkroom, obvious background noise can be formed to influence the measurement precision; on the other hand, the optical darkroom needs to be capable of accurately positioning the photosensitive LED, so that the detection precision and the consistency of product performance can be improved.

At present, when no smoke signal appears in the smoke sensor, the generated background noise is larger, on one hand, because the optical trap is unreasonable in design, part of light escapes from the optical trap, and in addition, the smoke sensor is related to that a cavity for receiving an LED is not completely in a dark state; furthermore, the emitting and receiving LEDs need to be accurately positioned, so that the light intensity of the emitting LEDs and the light intensity of the receiving LEDs in spatial distribution can be guaranteed, thereby guaranteeing the consistency of the signal output of the product.

Therefore, it is necessary to design a smoke sensor with high detection accuracy.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art existence, provide a high accuracy smoke transducer of low background noise.

The purpose of the utility model is realized through the following technical scheme:

a smoke sensor, characterized by: the smoke detection device comprises a base and a shell clamped and butted with the base to form a detection gas cavity, a circuit board is arranged on the back of the base and is packaged into a whole by a sealing plate, holes are formed in the shell, the base, the circuit board and the sealing plate at opposite positions to form a through detection gas flow channel, and the detection gas cavity exchanges smoke with the outside through the detection gas flow channel; a lower emission structure and a lower receiving structure are arranged beside the detection gas flow channel on the base, correspondingly, an upper emission structure matched with the lower emission structure is arranged at the position, right opposite to the lower emission structure, on the shell to form a relatively closed emission unit, an emission element for emitting detection light into the detection gas chamber is horizontally arranged in the lower emission structure, a pin of the emission element penetrates through the base to be electrically connected with the circuit board, and an emission end of the emission element faces the detection gas flow channel; an upper receiving structure matched with the upper receiving structure is arranged on the shell and right opposite to the lower receiving structure to form a closed receiving darkroom, the receiving element is horizontally arranged in the lower receiving structure, a pin of the receiving element penetrates through the base to be electrically connected with the circuit board, the receiving end of the receiving element faces the detection gas flow channel, and the front end of the receiving end is provided with a light-gathering optical component; a first positioning piece for positioning the emitting element and a first fixing piece for fixing the emitting element are arranged in the lower emitting structure; a second positioning part for positioning the receiving element and a second fixing part for fixing the receiving element are arranged in the lower receiving structure.

Further, in the smoke sensor, the emitting element is an emitting LED, the receiving element is a photosensitive LED, and central optical axes of the emitting LED and the photosensitive LED are located on the same plane perpendicular to the detection gas flow channel.

Further, a smoke sensor as described above, wherein the housing is provided with an optical trap for absorbing light in a region in front of the emitting element.

Further, in the smoke sensor, the upper receiving structure provided on the housing is a closed structure.

Further, in the smoke sensor, the lower receiving structure arranged on the base is a closed structure.

Further, in the smoke sensor, the upper receiving structure arranged on the housing and the lower receiving structure arranged on the base are mutually wedged to form a fully-closed receiving darkroom.

Further, in the smoke sensor, the hole in the housing and the hole in the sealing plate are provided with ribs for preventing foreign matters from entering.

Further, in the smoke sensor, the direction of the rib is parallel to the optical axis direction of the emitting element.

Compared with the prior art, the utility model have apparent advantage and beneficial effect, the concrete aspect that embodies is in following:

the utility model discloses smoke transducer who has location structure and closed darkroom, upper receiving structure and lower receiving structure form the closed receipt darkroom through the cooperation of enclosed construction, and receiving element arranges in and receives the darkroom, and the front region of receiving element has the optical trap, and the closed receipt darkroom makes receiving element avoid receiving the influence of interference light, prevents the influence to measurement accuracy;

the positioning piece and the fixing piece of the novel structure are designed in the lower transmitting structure and the lower receiving structure, the transmitting element and the receiving element are accurately positioned and fixed, and the detection precision and the consistency of product performance are improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1: the utility model discloses an exploded structure schematic diagram of a sensor;

FIG. 2: the structure schematic diagram of the base;

FIG. 3: the structure of the shell is schematically shown.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the directional terms and the sequence terms and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 3, a smoke sensor with a positioning structure and a closed darkroom comprises a base 2 and a housing 1 clamped and butted with the base 2 to form a detection gas chamber, a circuit board 3 is arranged on the back of the base 2 and is packaged into a whole by a sealing plate 4, holes are formed in the housing 1, the base 2, the circuit board 3 and the sealing plate 4 at opposite positions, namely, a hole 5 in the housing 1, a hole 12 in the base 2, a hole in the circuit board 3 and a hole in the sealing plate 4 to form a through detection gas channel, and the detection gas chamber exchanges smoke with the outside through the detection gas channel; a lower emission structure 8 and a lower receiving structure 10 are arranged beside the detection gas flow channel on the base 2, correspondingly, an upper emission structure 7 matched with the lower emission structure 8 is arranged at the position, right opposite to the lower emission structure 8, on the shell 1 to form a relatively closed emission unit, an emission element 9 for emitting probe light into the detection gas chamber is horizontally arranged in the lower emission structure 8, a pin of the emission element 9 penetrates through the base 2 to be electrically connected with the circuit board 3, and the emission end of the emission element 9 faces the detection gas flow channel; an upper receiving structure 6 matched with the lower receiving structure 10 is arranged on the shell 1 at a position opposite to the lower receiving structure 10 to form a closed receiving darkroom, a receiving element 11 is horizontally arranged in the lower receiving structure 10, a pin of the receiving element passes through the base 2 to be electrically connected with the circuit board 3, a receiving end of the receiving element 11 faces a detection gas flow channel, and the front end of the receiving end is provided with a light-gathering optical component 13; a positioning part I14 for positioning the emitting element 9 and a fixing part I15 for fixing the emitting element 9 are arranged in the lower emitting structure 8; a second positioning element 17 for positioning the receiving element 11 and a second fixing element 16 for fixing the receiving element 11 are arranged in the lower receiving structure 10.

The first fixing piece 15 comprises a pair of reverse hook-shaped fixing parts which are arranged oppositely, and the reverse hook-shaped fixing parts are made of soft materials; the second fixing member 16 comprises a pair of reverse hook-shaped fixing parts which are arranged oppositely and made of soft materials; for achieving a precise positioning of the transmitting element 9 and the receiving element 11.

The emitting element 9 is an emitting LED, the receiving element 11 is a photosensitive LED, and central optical axes of the emitting LED and the photosensitive LED are positioned on the same plane vertical to the detection gas flow channel.

The housing 1 is provided with optical traps 18 for absorbing light in the front region of the emitter element 9. The optical trap is provided with the baffle, and most of light rays can be absorbed through multiple times of emission; specifically, a plurality of baffle plates can be connected to form a folded structure.

The upper receiving structure 6 provided on the housing 1 is a closed structure. The lower receiving structure 10 provided on the base 2 is a closed structure. The upper receiving structure 6 and the lower receiving structure 10 are mutually wedged to form a fully closed receiving darkroom.

The holes 5 on the shell 1 and the holes on the closing plate 4 are provided with ribs for preventing foreign matters from entering, and the direction of the ribs is parallel to the optical axis direction of the emitting element 9.

The housing 1 and the base 2 form a detection chamber (detection gas chamber), and the detection chamber exchanges smoke with the outside through a detection hole. The emitting element 9 is at an angle to the receiving element 11. The upper receiving structure 6 and the lower receiving structure 10 form a closed receiving dark room through the cooperation of the closed structures, and the receiving element 11 is placed in the receiving dark room. In this way, on the one hand, the front area of the receiving element 11 has optical traps, and on the other hand, the receiving dark space is arranged in a rational manner, so that the receiving element 11 is not susceptible to disturbing light.

Optical traps are provided, on the one hand, to prevent external light from reaching the receiving element 11 (photosensitive LED), avoiding interference with the sensor; on the other hand, in the absence of smoke, the light emitted by the emitting element 9 (emitting LED) enters the optical trap and cannot reach the light-sensitive LED. In the detection cavity with the optical trap, once smoke enters, due to scattering of the smoke, an original light propagation path is changed, light can be detected by the photosensitive LED, the larger the light intensity received by the photosensitive LED is, the larger the generated electric signal is, the light intensity is in direct proportion to smoke concentration, and therefore the smoke concentration signal can be obtained by amplifying and calibrating the electric signal.

The photosensitive LED is arranged in the closed darkroom, so that interference light rays are prevented from entering the darkroom, and the influence on the measurement precision is prevented; the photosensitive LED is accurately positioned in the closed darkroom, so that the detection precision and the consistency of the product performance can be improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims

1. A smoke sensor, characterized by: the smoke detection device comprises a base (2) and a shell (1) clamped and butted with the base to form a detection gas cavity, wherein a circuit board (3) is arranged on the back surface of the base (2) and is packaged into a whole by a sealing plate (4), holes are formed in opposite positions on the shell (1), the base (2), the circuit board (3) and the sealing plate (4) to form a through detection gas channel, and the detection gas cavity exchanges smoke with the outside through the detection gas channel; a lower emission structure (8) and a lower receiving structure (10) are arranged beside a detection gas flow channel on the base (2), correspondingly, an upper emission structure (7) matched with the lower emission structure is arranged at the position, right opposite to the lower emission structure (8), on the shell (1) to form a relatively closed emission unit, an emission element (9) for emitting detection light into a detection gas chamber is horizontally arranged in the lower emission structure (8), pins of the emission element penetrate through the base (2) to be electrically connected with the circuit board (3), and the emission end of the emission element (9) faces the detection gas flow channel; an upper receiving structure (6) matched with the lower receiving structure (10) is arranged at the position, opposite to the lower receiving structure (10), on the shell (1) to form a closed receiving darkroom, a receiving element (11) is horizontally arranged in the lower receiving structure (10), a pin of the receiving element penetrates through the base (2) to be electrically connected with the circuit board (3), a receiving end of the receiving element (11) faces towards the detection gas flow channel, and the front end of the receiving end is provided with a light-gathering optical component (13); a first positioning part (14) for positioning the emitting element (9) and a first fixing part (15) for fixing the emitting element (9) are arranged in the lower emitting structure (8); a second positioning piece (17) for positioning the receiving element (11) and a second fixing piece (16) for fixing the receiving element (11) are arranged in the lower receiving structure (10).

2. A smoke sensor according to claim 1, wherein: the emitting element (9) is an emitting LED, the receiving element (11) is a photosensitive LED, and the central optical axes of the emitting LED and the photosensitive LED are positioned on the same plane vertical to the detection gas flow channel.

3. A smoke sensor according to claim 1, wherein: the housing (1) is provided with optical traps (18) for absorbing light in the front region of the emitting element (9).

4. A smoke sensor according to claim 1, wherein: the upper receiving structure (6) arranged on the shell (1) is a closed structure.

5. A smoke sensor according to claim 1, wherein: the lower receiving structure (10) arranged on the base (2) is a closed structure.

6. A smoke sensor according to claim 1, wherein: an upper receiving structure (6) arranged on the shell (1) and a lower receiving structure (10) arranged on the base (2) are mutually wedged to form a fully-closed receiving darkroom.

7. A smoke sensor according to claim 1, wherein: the hole (5) on the shell (1) and the hole on the sealing plate (4) are both provided with ribs for preventing foreign matters from entering.

8. A smoke sensor according to claim 7, wherein: the direction of the ribs is parallel to the optical axis direction of the emitting element (9).