Gas detector

Abstract

The utility model relates to the technical field of gas detection, and discloses a gas detector. The fuel gas detector comprises a shell defining a containing cavity, the shell is provided with a vent hole, and the vent hole is communicated with the outside and the containing cavity; the circuit board is positioned in the accommodating cavity; the circuit board support is located in the containing cavity, arranged on one side of the circuit board and connected with the circuit board; the laser module is positioned in the accommodating cavity and is arranged between the circuit board and the circuit board bracket; the circuit board support is provided with a vent hole, so that airflow flowing in from the vent hole flows to the laser module through the vent hole of the circuit board support. At least part of gas entering the vent holes needs to pass through the vent holes of the circuit board support to reach the position of the laser module, so that the path of airflow flowing to the laser module is prolonged, part of oil smoke in the airflow can be adsorbed on the passing circuit board support, finally the oil smoke flowing to the laser module is reduced, the oil smoke accumulated on the laser module is reduced, and the service life of the laser module is prolonged. And the service life of the laser module is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of gas detection, for example, to a gas detector. Background Art

[0002] Currently, in the detection of combustible gases, laser detection is a detection method with relatively high accuracy. Household gas detectors are generally used in kitchens with a lot of lampblack, and the accumulation of lampblack on the laser gas detector head will affect the normal inspection of the equipment.

[0003] A gas detector is disclosed in the related art, including: a mounting base, the mounting base having a detection gas chamber; a detection device, the detection device being disposed in the detection gas chamber, the detection device being used for detecting the concentration of natural gas; an information acquisition and processing module, the information acquisition and processing module being communicatively connected to the detection device and disposed in the mounting base; an alarm device, the alarm device being disposed on the mounting base and communicatively connected to the information acquisition and processing module, the information acquisition and processing module being used for controlling the operation of the alarm device; a cover body, the cover body being detachably connected to the mounting base and covering the detection gas chamber, the cover body having a ventilation hole communicating with the detection gas chamber.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] In the related art, the cover body is provided with a ventilation hole, and gas enters the detection gas chamber through the ventilation hole. The detection device is disposed in the detection gas chamber, so that the detection device is directly in contact with the external lampblack through the ventilation hole, and the lampblack is likely to accumulate on the detection device, affecting the normal detection of the detection device. Although the cover body and the mounting base can be detached for cleaning in the related art, in areas with heavy lampblack such as kitchens, the detection device is easily blocked in a short period of time, and the user needs to frequently detach the cover body for cleaning, reducing the user experience.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Utility Model Content

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] The embodiments of the present disclosure provide a gas detector to reduce the accumulation of lampblack on the detection device of the gas detector, reduce the number of cleaning times, and improve the service life of the detection device.

[0009] An embodiment of the present disclosure provides a gas detector, which includes: a housing defining an accommodation cavity, the housing being provided with air vents that communicate the outside with the accommodation cavity; a circuit board located in the accommodation cavity; a circuit board bracket located in the accommodation cavity and disposed on one side of the circuit board and connected to the circuit board; a laser module electrically connected to the circuit board, located in the accommodation cavity, and disposed between the circuit board and the circuit board bracket; wherein, the circuit board bracket is provided with ventilation holes so that the air flow flowing in through the air vents flows to the laser module through the ventilation holes of the circuit board bracket.

[0010] Optionally, the circuit board bracket includes: a body corresponding to the laser module; a mounting portion connected to the outside of the body and connected to the circuit board; wherein, the mounting portion and / or the body are provided with ventilation holes.

[0011] Optionally, the mounting portion is provided with first ventilation holes that are sequentially spaced along the circumferential direction of the mounting portion, and the ventilation holes include the first ventilation holes.

[0012] Optionally, at least a part of the body is recessed away from the circuit board to form an avoidance groove, and the laser module is located in the avoidance groove; wherein, at least one of the rear groove wall, upper groove wall and lower groove wall of the avoidance groove is provided with second ventilation holes, and the ventilation holes include the second ventilation holes.

[0013] Optionally, the body includes: an avoidance portion configured with an avoidance groove; a support portion connected between the avoidance portion and the mounting portion, the support portion being provided with third ventilation holes, and the ventilation holes include the third ventilation holes; wherein, the support portion is disposed in contact with the circuit board, and a first communication hole is provided at one end of the third ventilation hole facing the avoidance groove, and the first communication hole communicates the third ventilation hole with the avoidance groove; and / or, the support portion is spaced from the circuit board, there is a gap between the support portion and the circuit board, and the gap communicates the avoidance groove and the third ventilation hole.

[0014] Optionally, the support portion protrudes towards the circuit board beyond the mounting portion, and the circuit board bracket further includes: a step structure connected between the support portion and the mounting portion; wherein, when a first communication hole is provided at one end of the third ventilation hole facing the avoidance groove, the step structure is further provided with a second communication hole that communicates the first ventilation hole and the third ventilation hole; and / or, when there is a gap between the support portion and the circuit board, the step structure is further provided with a third communication hole that communicates the first ventilation hole and the third ventilation hole.

[0015] Optionally, the front side wall of the housing is provided with first air vents, and at least a part of the air flow flowing in through the first air vents can bypass the circuit board and then flow to the laser module through the ventilation holes, and the air vents include the first air vents.

[0016] Optionally, the outer edge of the circuit board protrudes beyond the outer side of the step structure so that the air flow at the outer edge of the circuit board flows to the laser module through the second communication hole and / or the third communication hole.

[0017] Optionally, along the front-to-back direction, the circuit board, the laser module, and the circuit board bracket are arranged in sequence; an outer edge of a rear sidewall of the housing is provided with second ventilation holes, the number of the second ventilation holes is multiple, and the multiple second ventilation holes are sequentially arranged at intervals along the circumferential direction of the housing, and the ventilation holes include the second ventilation holes.

[0018] Optionally, the rear sidewall of the housing includes: a rear housing body; a connecting sidewall, connected to the outside of the rear housing body and extending in a ring shape along the circumferential direction of the rear housing body, and the connecting sidewall inclines outward along the rear-to-front direction, and the second ventilation holes are arranged on the connecting sidewall; the second ventilation holes are communicated with the first ventilation holes.

[0019] The gas detector provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] For the gas detector according to the embodiment of the present disclosure, the housing is provided with ventilation holes, the laser module is located between the circuit boards, and the circuit board bracket is provided with ventilation holes. In this way, the gas entering through the ventilation holes first diffuses in the accommodation cavity, and then at least part of the air flow needs to pass through the ventilation holes of the circuit board bracket to reach the position of the laser module. In this way, the path of the air flow flowing to the laser module is extended, and part of the oil fume in the air flow can be adsorbed on the passing circuit board bracket, and finally the oil fume flowing to the laser module is reduced. In this way, it can not only ensure the gas detection function of the laser module, but also reduce the oil fume accumulated on the laser module, improve the service life of the laser module, and reduce the frequency of user cleaning, improving the user experience. In addition, the circuit board bracket is located on one side of the laser module, which is also convenient for the air flow to diffuse to the laser module, improving the detection efficiency.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings, and these exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a proportional limitation, and among them:

[0023] Figure 1 is a schematic structural diagram of a perspective view of a gas detector provided by an embodiment of the present disclosure;

[0024] Figure 2 is an exploded structural diagram of a gas detector provided by an embodiment of the present disclosure;

[0025] Figure 3 is a partial structural diagram of a gas detector provided by an embodiment of the present disclosure;

[0026] Figure 4It is another partial structural schematic diagram of the gas detector provided by the embodiments of the present disclosure;

[0027] Figure 5 It is another partial structural schematic diagram of the gas detector provided by the embodiments of the present disclosure;

[0028] Figure 6 It is a structural schematic diagram of a circuit board bracket from one perspective provided by the embodiments of the present disclosure;

[0029] Figure 7 It is a structural schematic diagram of a circuit board bracket from another perspective provided by the embodiments of the present disclosure;

[0030] Figure 8 It is another partial structural schematic diagram of the gas detector provided by the embodiments of the present disclosure;

[0031] Figure 9 It is a sectional structural schematic diagram of the gas detector provided by the embodiments of the present disclosure;

[0032] Figure 10 It is a structural schematic diagram of a circuit board provided by the embodiments of the present disclosure;

[0033] Figure 11 It is a structural schematic diagram of a rear housing from one perspective provided by the embodiments of the present disclosure;

[0034] Figure 12 It is a structural schematic diagram of a rear housing from another perspective provided by the embodiments of the present disclosure;

[0035] Figure 13 It is another sectional structural schematic diagram of the gas detector provided by the embodiments of the present disclosure;

[0036] Figure 14 It is a structural schematic diagram of a front housing provided by the embodiments of the present disclosure.

[0037] Reference numerals:

[0038] 10. Housing; 101. Front housing; 1011. Front side wall; 1012. Peripheral side wall; 102. Rear housing; 103. First ventilation hole; 104. Second ventilation hole; 105. Clamping groove; 20. Circuit board; 201. First through hole; 202. Second through hole; 203. Connecting hole; 204. Gap; 205. Notch; 206. First notch; 207. Second notch; 30. Circuit board bracket; 301. Mounting part; 3011. First ventilation hole; 302. Body; 303. Avoidance part; 3031. Avoidance groove; 3032. Second ventilation hole; 304. Support part; 3041. Third ventilation hole; 305. First communication hole; 306. Second communication hole; 307. Third communication hole; 308. Void; 309. Hook; 310. Stud; 311. Step structure; 40. Rear housing body; 401. Connecting side wall; 403. First clamping projection; 404. Second clamping projection; 50. Laser module. Detailed implementation manners

[0039] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and illustration purposes and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0040] The terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the embodiments of the present disclosure are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present disclosure here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0041] In the embodiments of the present disclosure, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0042] In addition, the terms "arranged", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0043] Unless otherwise specified, the term "plurality" means two or more.

[0044] The term "and / or" is a description of the association relationship of an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0045] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0046] For the sake of convenience of description, the front-back direction of the present application is as Figure 2 shown.

[0047] Figure 2 The thin line arrows on both sides of the circuit board in [FIGURE REFERENCE] represent the flow paths of the airflow bypassing the circuit board through gaps or notches, the dashed lines represent the flow paths of the airflow passing through the through holes in the circuit board, and the thick line arrows represent the flow paths of the airflow entering from the rear housing and passing through the circuit board bracket.

[0048] Combined with Figures 1 to 14 shown, the embodiments of the present disclosure provide a gas detector, which includes a housing 10. The housing 10 defines a receiving cavity, and the housing 10 is provided with air-permeable holes that communicate the outside and the receiving cavity, so that the gas outside can flow into the receiving cavity through the air-permeable holes.

[0049] Optionally, a first air-permeable hole 103 is provided on the front side wall 1011 of the housing 10, and the first air-permeable hole 103 communicates the outside with the receiving cavity. The gas outside flows into the receiving cavity through the first air-permeable hole 103, where the air-permeable holes include the first air-permeable hole 103.

[0050] Optionally, the number of the first air-permeable holes 103 is plural, which can increase the inflow of gas.

[0051] Optionally, as Figure 1As shown, a plurality of first ventilation holes 103 are sequentially arranged at intervals along the radial direction of the front side wall 1011 of the housing 10 to form a first ventilation hole group. The number of the first ventilation hole groups is multiple, and the multiple first ventilation hole groups are sequentially arranged at intervals along the circumferential direction of the front side wall 1011 of the housing 10. In this way, the front side wall 1011 of the housing 10 can increase the number of the first ventilation holes 103 both in the radial direction and the circumferential direction, thereby increasing the ventilation volume.

[0052] Optionally, a button is further provided on the front side wall 1011 of the housing 10, and the button is used to control the operation of the gas detector.

[0053] Optionally, as Figure 2 and Figure 3 shown, the gas detector further includes a circuit board 20 and a laser module 50. The circuit board 20 and the laser module 50 are both located in the accommodation cavity. The laser module 50 is arranged on the side of the circuit board 20 facing away from the front side wall 1011, so that the airflow flowing in through the first ventilation holes 103 bypasses the circuit board 20 and flows to the laser module 50. The laser module 50 is electrically connected to the circuit board, and the laser module is used to detect the concentration of gas.

[0054] In the embodiment of the present disclosure, the laser module 50 has various advantages in the field of gas detection, including long-distance detection, high precision, fast response, high system stability and reliability, and multi-gas detection ability, providing effective technical support for gas safety monitoring. The laser module 50 is arranged on the side of the circuit board 20 facing away from the front side wall 1011, and the laser module 50 is not directly opposite to the first ventilation holes 103, avoiding the laser module 50 being exposed to the oil fume environment. The external gas first diffuses into the accommodation cavity through the first ventilation holes 103 on the front side wall 1011 and can reach the area where the laser module 50 is located only after bypassing the circuit board 20. In this way, the flow path of the airflow in the accommodation cavity is extended, and during this process, part of the oil fume will be adsorbed onto the passing housing 10 or the circuit board 20, reducing the oil fume finally falling on the laser module 50, ensuring the sensitivity of the laser probe, and extending the service life of the laser module 50.

[0055] The laser module 50 is communicatively connected to the circuit board 20. The laser module 50 can convert the detected gas concentration into a data signal and then transmit the data signal to the circuit board 20. When the concentration of methane or the target gas in the airflow exceeds the preset value, the circuit board can determine whether the natural gas leaks, thereby achieving the detection effect.

[0056] Optionally, as Figure 3 shown, a gap 204 is formed between the outer edge of the circuit board 20 and the inner wall surface of the housing 10, so that the oil fume flowing in through the first ventilation holes 103 passes through the gap 204 and flows to the laser module 50.

[0057] In the embodiments of the present disclosure, a gap 204 is formed between the outer edge of the circuit board 20 and the inner wall surface of the housing 10. In this way, after the air flow flowing in through the first ventilation hole 103 is blocked by the circuit board 20, it can bypass the circuit board 20 through the gap 204 between the circuit board 20 and the inner wall surface of the housing 10, so that the air flow can reach the laser module 50 on the back surface of the circuit board 20 to ensure the detection function of the laser module 50.

[0058] Optionally, the gap 204 extends annularly or is arranged in segments along the circumferential direction of the circuit board 20.

[0059] In the embodiments of the present disclosure, the gap 204 can extend annularly, which can increase the air flow area in the circumferential direction and improve the uniformity of air flow. The gap 204 can also be arranged in segments, which can be set according to the connection situation between the outer edge of the circuit board 20 and the housing 10 or other components, so as to ensure the size of the gap 204 to the greatest extent.

[0060] Optionally, the circuit board 20 is arranged parallel and spaced apart from the front side wall 1011 of the housing 10, and the shapes of the housing 10 and the circuit board 20 match, that is, the shapes of the housing 10 and the circuit board 20 are the same or similar. This facilitates the connection between the housing 10 and the circuit board 20 to fix the position of the circuit board 20 in the accommodation cavity. For example, the housing 10 is circular and the circuit board 20 is also circular.

[0061] Optionally, as Figure 5 、 10 、shown in 13, a notch 205 is provided at the outer edge of the circuit board 20, so that the oil fume flowing in through the air hole can flow to the laser module 50 through the notch 205.

[0062] In the embodiments of the present disclosure, a notch 205 is provided at the outer edge of the circuit board 20, which can increase the distance between the circuit board 20 and the inner wall surface of the housing 10, so as to increase the air flow area and ensure the air flow volume flowing to the laser module 50.

[0063] Optionally, the outer edge of the circuit board 20 is recessed towards the center of the circuit board 20 to form a notch 205.

[0064] Optionally, the number of the notches 205 is multiple, and the multiple notches 205 are arranged at intervals in sequence along the circumferential direction of the circuit board 20, which can increase the gas volume flowing from the first ventilation hole 103 to the gas module, and thus improve the detection efficiency of the laser module 50.

[0065] Optionally, as Figure 4 shown, the laser module 50 is in contact with the circuit board 20.

[0066] In the embodiments of the present disclosure, the laser module 50 can be close to or attached to the circuit board 20, which can reduce the thickness of the gas detector in the front-back direction, thereby reducing the volume of the gas detector and facilitating the installation and use of the gas detector.

[0067] Optionally, the laser module 50 is connected to the circuit board 20.

[0068] In the embodiments of the present disclosure, the laser module 50 can be connected to the circuit board 20, which can achieve the fixation of the laser module 50.

[0069] Optionally, the laser module 50 is fixedly connected to the circuit board 20, which can prevent the laser module 50 from falling off. For example, the laser module 50 is welded or adhered to the circuit board 20.

[0070] Optionally, the laser module 50 is detachably connected to the circuit board 20, which facilitates the disassembly of the laser module 50 for maintenance, cleaning or replacement.

[0071] For example, the laser module 50 and the circuit board 20 can be connected by means of snap connection, magnetic attraction or screws.

[0072] Optionally, as Figure 2 、 Figures 4 to 9 shown, the gas detector further includes a circuit board bracket 30, and the circuit board bracket 30 is located on the side of the laser module 50 away from the circuit board 20.

[0073] In the embodiments of the present disclosure, along the front-to-back direction, the front side wall of the housing, the circuit board 20, the laser module 50, the circuit board bracket 30 and the rear side wall of the housing are arranged in sequence. The circuit board bracket 30 is located on the side of the laser module 50 away from the circuit board 20, and the circuit board bracket 30 is used to fix the circuit board 20.

[0074] Optionally, the circuit board bracket 30 is spaced from the circuit board 20, so that the airflow bypassing the circumference of the circuit board 20 can smoothly flow to the laser module 50.

[0075] Optionally, the laser module 50 is connected to the circuit board bracket 30.

[0076] In the embodiments of the present disclosure, the laser module 50 can also be arranged on the circuit board bracket 30. In this way, the laser module 50 does not need to be connected to the circuit board 20, which can reduce the influence on the circuit board 20 and also facilitate the disassembly of the laser module 50.

[0077] Optionally, the laser module 50 is detachably connected to the circuit board bracket 30. This facilitates the disassembly, maintenance and cleaning of the laser module 50.

[0078] Exemplarily, the laser module 50 and the circuit board bracket 30 are detachably connected by means of snap connection, magnetic attraction or screws.

[0079] Optionally, the laser module 50 is fixedly connected to the circuit board bracket 30. This can improve the connection stability between the laser module 50 and the circuit bracket and prevent the laser module 50 from falling off.

[0080] Exemplarily, the laser module 50 and the circuit board bracket 30 can be fixedly connected by means of bonding.

[0081] Optionally, the laser module 50 can be connected to both the circuit board bracket 30 and the circuit board 20.

[0082] It should be noted that: the laser module 50 in the embodiments of the present disclosure is always in communication connection with the circuit board, and the connection methods between the laser module 50 and the circuit board or the circuit board bracket mentioned above are mainly mechanical connections.

[0083] Optionally, as Figures 4 to 9 shown, a part of the circuit board bracket 30 is recessed away from the circuit board 20 to form an avoidance groove 3031, and the laser module 50 is located in the avoidance groove 3031.

[0084] In the embodiments of the present disclosure, the circuit board bracket 30 forms an avoidance groove 3031. The avoidance groove 3031 facilitates the placement of the laser module 50, which can avoid interference between the circuit board bracket 30 and the laser module 50 and improve the space around the laser module 50, facilitating the flow of air into the laser module 50.

[0085] Optionally, the avoidance groove 3031 matches the laser module 50, that is to say, the shape of the avoidance groove 3031 is the same as or similar to that of the laser module 50. For example, if the laser module 50 is rectangular, the avoidance groove 3031 is also rectangular. If the laser module 50 is circular, the avoidance groove 3031 is also circular.

[0086] Optionally, the size of the avoidance groove 3031 is larger than that of the laser module 50 to facilitate the cooperation between the laser module 50 and the avoidance groove 3031.

[0087] Optionally, as Figure 5 shown, the circuit board bracket 30 is detachably connected to the circuit board 20.

[0088] In the embodiments of the present disclosure, the circuit board bracket 30 is detachably connected to the circuit board 20. In this way, the circuit board bracket 30 can not only support and fix the circuit board 20, but also facilitate the disassembly of the circuit board bracket 30 and the circuit board 20.

[0089] Optionally, as Figure 5As shown, a hook 309 is provided on the outer edge of the circuit board bracket 30 , and the hook 309 extends toward the circuit board 20 . The hook 309 is adapted to the outer edge of the circuit board 20 . When the outer edge of the circuit board 20 is located in the hook 309 , the circuit board 20 is connected to the circuit board bracket 30 .

[0090] In the disclosed embodiment, a hook 309 is provided at the outer edge of the circuit board bracket 30 , and the hook 309 can be engaged with the outer edge of the circuit board 20 , thereby achieving fixation of the circuit board bracket 30 to the circuit board 20 .

[0091] Optionally, there are multiple hooks 309 , and the multiple hooks 309 are sequentially spaced apart along the circumference of the circuit board bracket 30 , which can improve the connection between the circuit board bracket 30 and the circuit board 20 .

[0092] Optionally, the housing 10 is detachably connected to the circuit board 20. In this way, the circuit board 20 can be fixed not only by the circuit board bracket 30, but also by the housing 10, thereby achieving a stable connection of the circuit board 20.

[0093] Alternatively, if Figure 14 As shown, the inner wall surface of the housing 10 is configured with a snap-in groove 105 , and the outer edge of the circuit board 20 is snap-into the snap-in groove 105 .

[0094] In the disclosed embodiment, the outer edge of the circuit board 20 is snapped into the snap-in groove 105, so that the circuit board 20 is stable relative to the housing 10, and the snap-in groove 105 is used to connect so that a gap 204 is formed between the outer edge of the circuit board 20 and the inner wall surface of the housing 10 to facilitate gas to flow from the outer edge of the circuit board 20 into the laser module 50.

[0095] Optionally, there are multiple snap-in slots 105 , which are spaced apart in sequence along the circumference of the circuit board 20 . This not only improves the connection stability between the circuit board 20 and the shell 10 , but also ensures a gap 204 between the shell 10 and the circuit board 20 .

[0096] Alternatively, if Figure 5 and Figure 10 As shown, the snap-fitting groove 105 and the notch 205 are staggered, which can reduce the size of the snap-fitting groove 105 and facilitate the connection between the housing 10 and the circuit board 20 .

[0097] Optionally, when the size of the notch 205 is relatively large, a snap-in groove 105 is constructed on the inner wall surface of the shell 10 corresponding to the notch 205, and the snap-in groove 105 is snap-fitted to the notch 205, so as to avoid the notch 205 being relatively large, resulting in an unstable connection between the circuit board 20 and the shell 10.

[0098] Alternatively, if Figure 13As shown, the engaging groove 105 corresponds to the edge of the notch 205.

[0099] In the embodiment of the present disclosure, the engaging groove 105 corresponds to the edge of the notch 205, that is to say, the engaging groove 105 is engaged with the edge of the notch 205, so that not only the notch 205 can be fixed, but also the shielding of the notch 205 by the engaging groove 105 can be reduced, ensuring the flow area of the notch 205.

[0100] Optionally, the laser module 50 corresponds to the middle part of the circuit board 20, and the laser module 50 extends along the radial direction of the circuit board 20.

[0101] In the embodiment of the present disclosure, the laser module 50 corresponds to the middle part of the circuit board 20, so that the air flow flowing in from the circumferential direction of the circuit board 20 can reach the laser module 50, improving the uniformity of the air flow flowing to the laser module 50. When the size of the laser module 50 is relatively large, the laser module 50 extends along the radial direction of the circuit board 20, which is convenient for the installation and setting of the laser module 50.

[0102] Optionally, the outer edge of the laser module 50 is located inside the outer edge of the circuit board 20, that is to say, the laser module 50 does not protrude from the outer edge of the circuit board 20, so as to avoid the increase in the size of the gas detector caused by the laser module 50 protruding from the circuit board 20, and improve the convenience of use and installation of the gas detector.

[0103] Optionally, the laser module 50 is in a long strip shape, and the laser module 50 extends along the diameter of the circuit board 20.

[0104] Optionally, as Figure 11 and Figure 12 shown, the second ventilation hole 104 is opened on the rear side wall of the housing 10, and the second ventilation hole 104 is communicated with the accommodation cavity, so that the external gas can flow into the accommodation cavity through the second ventilation hole 104 and then flow to the laser module 50, and the ventilation holes include the second ventilation hole 104.

[0105] In the embodiment of the present disclosure, the second ventilation hole 104 is also provided on the rear side wall of the housing 10, so that the gas can also enter from the rear side of the housing 10. After the gas enters the accommodation cavity, it can also flow to the laser module 50 from the gap between the circuit board bracket and the housing or through the circuit board bracket.

[0106] Optionally, as Figure 5 and Figure 10 shown, the circuit board 20 is provided with a through hole, so that at least part of the gas flowing in through the first ventilation hole 103 flows to the laser module 50 through the through hole.

[0107] In the embodiments of the present disclosure, the circuit board 20 is provided with through holes, and at least part of the gas flowing into the first ventilation holes 103 can also flow into the laser module 50 on the back side of the circuit board 20 through the through holes of the circuit board 20. In this way, part of the oil fume in the air flow flowing into the laser module 50 will be adsorbed by the circuit board 20, reducing the oil fume accumulated in the laser module 50. This can not only ensure the gas detection function of the laser module 50, but also reduce the oil fume accumulated in the laser module 50, improve the service life of the laser module 50, and reduce the frequency of user cleaning, thereby improving the user experience.

[0108] It can be understood that the circuit board is provided with through holes, which is not only applicable to the solution where the laser module 50 is located on the side of the circuit board facing away from the front side wall. When the laser module 30 is arranged on one side of the circuit board facing the front side wall and the rear side wall of the housing can intake air, the air flow on the side of the circuit board facing the rear side wall can also flow to the laser module 50 through the through holes of the circuit board.

[0109] Optionally, the through holes are arranged in the bare copper area of the circuit board.

[0110] Optionally, the number of the through holes is multiple, and the multiple through holes are spaced apart on the circuit board 20.

[0111] In the embodiments of the present disclosure, the circuit board 20 is provided with multiple through holes, which can increase the total flow area of the through holes, thereby increasing the air flow flowing into the laser module 50 and ensuring the detection efficiency of the laser module 50.

[0112] Optionally, as Figure 5 shown, the multiple through holes include a first through hole 201 and a second through hole 202. The second through hole 202 is located outside the first through hole 201, and the second through hole 202 is close to the outer edge of the circuit board 20; wherein, the opening area of the second through hole 202 is larger than the opening area of the first through hole 201.

[0113] In the embodiments of the present disclosure, the second through hole 202 is located outside the first through hole 201, and there are more solder joints on the inner side of the circuit board 20. Therefore, the opening area of the first through hole 201 is smaller, which can reduce the impact on the strength of the circuit board 20. The second through hole 202 is located outside and close to the outer edge of the circuit board 20, and there are fewer solder joints near the outer edge of the circuit board 20. The opening area of the second through hole 202 is larger, which can increase the flow area while reducing the impact on the strength and solder joints of the circuit board 20.

[0114] It should be noted that the second through hole 202 is located outside the first through hole 201, which means that the distance from the second through hole 202 to the center of the circuit board 20 is greater than the distance from the first through hole 201 to the center of the circuit board.

[0115] Optionally, the number of the second through holes 202 is multiple, and the multiple second through holes 202 are sequentially and spaced apart along the circumferential direction of the circuit board 20.

[0116] In the embodiments of the present disclosure, a plurality of second through holes 202 are sequentially arranged at intervals along the circumferential direction of the circuit board 20, so that air flow can flow from the circumferential direction of the circuit board 20 to the laser module 50, improving the uniformity of air flow circulation.

[0117] Optionally, the number of the first through holes 201 is multiple, and the multiple first through holes 201 are arranged at intervals on the circuit board 20, so as to further increase the air flow rate in the middle of the circuit board 20.

[0118] Optionally, the outer edge of the circuit board 20 includes a connecting portion and a circulation portion, the connecting portion is detachably connected to the housing 10; the circulation portion is configured with a notch 205, and the circulation portion and the connecting portion are sequentially arranged along the circumferential direction of the circuit board 20.

[0119] Optionally, as Figure 5 shown, the notch 205 includes a first notch 206, the first notch 206 includes a first connecting side and a second connecting side, the first connecting side and the second connecting side are in an L shape, one end of the first connecting side is connected to the connecting portion, one end of the second connecting side is connected to the connecting portion, the other end of the first connecting side and the second connecting side are connected and arranged in an L shape, and the other end of the first connecting side and the other end of the second connecting side are located inside the connecting portion, so that both the circulation area of the first notch 206 can be increased and the strength of the circuit board 20 can be ensured.

[0120] Optionally, the number of the first notches 206 is multiple, and the multiple first notches 206 are sequentially arranged at intervals along the circumferential direction of the circuit board 20. Among them, the clamping groove 105 includes a first clamping groove, and the first clamping groove is located between adjacent first notches 206, so as to improve the connection stability between the circuit board 20 and the housing 10 between the two first notches 206 and prevent the circuit board 20 from shaking or falling off.

[0121] Optionally, as Figure 5 shown, the notch 205 includes a second notch 207, the second notch 207 includes a third connecting side, and both ends of the second connecting side are respectively connected to the connecting portion, so that the second notch 207 can be arranged at the position where the number of solder joints of the circuit board 20 is small to increase the circulation area of the second notch 207.

[0122] Optionally, the clamping groove 105 includes a second clamping groove, and the second clamping groove is clamped with at least one side of the second notch 207 to improve the connection strength of the circuit board 20 at the second notch 207 and prevent the circuit board 20 from loosening or falling off.

[0123] Optionally, the second through hole 202 is arranged on the connecting portion.

[0124] In the embodiment of the present disclosure, a notch 205 is provided at the circulation part, and the gas flowing in through the first ventilation hole 103 can flow to the laser module 50 through the notch 205. The connection part is connected to the housing 10. That is to say, the distance between the connection part and the housing 10 is relatively close. Therefore, a second through hole 202 is provided at the connection part, so that air flow can pass through the circumference of the circuit board 20, improving the uniformity of air flow.

[0125] Optionally, the distance from the second through hole 202 to the center of the circuit board 20 is greater than or equal to the distance from the notch 205 to the center of the circuit board 20, which can further increase the air flow area near the outer edge of the circuit board 20.

[0126] Optionally, a stud 310 is formed on the side of the circuit board bracket 30 facing the circuit board 20; wherein, the circuit board 20 is further provided with a connection hole 203, and the connection hole 203 corresponds to the stud 310, and the stud 310 penetrates through the connection hole 203 to realize the connection between the circuit board 20 and the circuit board bracket 30.

[0127] In the embodiment of the present disclosure, the circuit board 20 is connected to the circuit board bracket 30 through the stud 310 and the connection hole 203. This can not only improve the connection stability of the circuit board 20, but also the connection hole 203 facilitates part of the air flow to pass through the circuit board 20 and flow to the laser module 50.

[0128] Optionally, as Figures 6 to 9 shown, the circuit board bracket 30 is provided with ventilation holes, so that the gas flowing in through the ventilation holes flows to the laser module 50 through the ventilation holes of the circuit board bracket 30.

[0129] In the embodiment of the present disclosure, the circuit board bracket 30 is provided with ventilation holes. In this way, the gas entering through the ventilation holes first diffuses in the accommodation cavity, and then at least part of the gas needs to pass through the ventilation holes of the circuit board bracket 30 to reach the position of the laser module 50. This prolongs the path of the air flow flowing to the laser module 50, and part of the oil fume in the air flow can be adsorbed on the passing circuit board bracket 30, finally reducing the oil fume flowing to the laser module 50. This can not only ensure the gas detection function of the laser module 50, but also reduce the oil fume accumulated on the laser module 50, improve the service life of the laser module 50, and reduce the frequency of user cleaning, improving the user experience.

[0130] It can be understood that the external air flow can flow into the accommodation cavity through the first ventilation hole at the front side, and then part of the air flow flows to the motor bracket and then flows to the laser module through the ventilation holes of the circuit board bracket. The external air flow can also flow into the accommodation cavity through the second ventilation hole at the rear side, and then pass through the ventilation holes of the circuit board bracket and flow to the laser module.

[0131] Optionally, the circuit board bracket 30 includes a mounting portion 301 and a body 302. The mounting portion 301 is connected to the circuit board 20. The body 302 is located inside the mounting portion 301, and the laser module 50 corresponds to the body 302. Among them, the mounting portion 301 and / or the body 302 are provided with ventilation holes.

[0132] In the embodiment of the present disclosure, the mounting portion 301 is used to be connected to the circuit board 20 to connect and fix the circuit board 20. The body 302 corresponds to the laser module 50. The mounting portion 301 and the body 302 are both provided with ventilation holes so that air flow can flow to the laser module 50 from multiple directions.

[0133] Optionally, as Figure 7 shown, at least a part of the body 302 is recessed away from the circuit board 20 to form an avoidance groove 3031, and the laser module 50 is located in the avoidance groove 3031. In the embodiment of the present disclosure, the body 302 forms the avoidance groove 3031 to place the circuit board 20, which can reduce the distance between the mounting portion 301 and the circuit board 20 and facilitate the connection between the mounting portion 301 and the circuit board 20.

[0134] Optionally, the mounting portion 301 is annular. The mounting portion 301 is provided with first ventilation holes 3011, and the first ventilation holes 3011 are sequentially arranged at intervals along the circumference of the mounting portion 301. The ventilation holes include the first ventilation holes 3011.

[0135] In the embodiment of the present disclosure, the mounting portion 301 is annular, and the first ventilation holes 3011 are sequentially arranged at intervals along the circumference of the mounting portion 301, so that air flow can flow from the circumference between the circuit boards 20 to the laser module 50, improving the air flow rate and flow uniformity.

[0136] Optionally, the mounting portion 301 is provided with hooks 309, and the hooks 309 are adapted to the outer edge of the circuit board 20. When the outer edge of the circuit board 20 is engaged with the hooks 309, the circuit board bracket 30 is connected to the circuit board 20.

[0137] Optionally, as Figure 7 and Figure 8 shown, the notch of the avoidance groove 3031 faces forward, and at least one of the rear groove wall, upper groove wall and lower groove wall of the avoidance groove 3031 is provided with second ventilation holes 3032. The ventilation holes include the second ventilation holes 3032.

[0138] In the embodiment of the present disclosure, the multiple groove walls of the avoidance groove 3031 are provided with second ventilation holes 3032, so that air flow can flow into the laser module 50 from multiple directions of the avoidance groove 3031 to increase the air inflow rate and ensure the detection efficiency of the laser module 50.

[0139] Optionally, the second ventilation holes 3032 are strip-shaped, which can increase the flow area of the second ventilation holes 3032.

[0140] Optionally, a plurality of second ventilation holes 3032 are arranged side by side and spaced apart to further increase the flow area.

[0141] Optionally, the main body 302 includes an avoidance portion 303 and a supporting portion 304, the avoidance portion 303 is configured with an avoidance groove 3031; the supporting portion 304 is connected between the avoidance portion 303 and the mounting portion 301, and the avoidance portion 303 is located on the side of the supporting portion 304 away from the outer edge of the circuit board 20; wherein the supporting portion 304 is provided with a third ventilation hole 3041, and the ventilation hole includes the third ventilation hole 3041.

[0142] In the disclosed embodiment, the avoidance portion 303 is configured with an avoidance groove 3031, and the support portion 304 is connected between the avoidance portion 303 and the mounting portion 301, which can ensure the strength of the circuit board bracket 30. The support portion 304 is provided with a third vent hole 3041, so that the airflow can also flow from the second vent hole 3032 into the laser module 50, thereby improving the flow of gas.

[0143] Optionally, the avoidance groove 3031 is located in the middle of the main body 302, and support parts 304 are provided on both sides of the avoidance groove 3031, and each support part 304 is provided with a third ventilation hole 3041, so that airflow can flow into both sides of the avoidance groove 3031, thereby increasing the inflow of airflow and thereby improving the detection efficiency of the laser module 50.

[0144] Alternatively, if Figure 4 As shown, the support portion 304 is provided with a stud 310 , and the stud 310 is connected to the connection hole 203 of the circuit board 20 .

[0145] Optionally, the support portion 304 protrudes from the mounting portion 301 in the direction of the circuit board 20, and a step structure 311 is formed at the connection between the mounting portion 301 and the main body 302. The step structure 311 is provided with a fourth ventilation hole, and the fourth ventilation hole is connected to the first ventilation hole 3011. The ventilation holes include the fourth ventilation hole, which can further increase the flow area of the ventilation holes of the circuit board bracket 30.

[0146] Optionally, the hook 309 protrudes from the support portion 304 in the direction of the circuit board 20 , so that the circuit board 20 can be engaged with the hook 309 , and the circuit boards 20 will not directly interfere with each other.

[0147] Optionally, the laser module 50 is spaced apart from the groove wall of the avoidance groove 3031 .

[0148] In the embodiments of the present disclosure, the laser module 50 is spaced apart from the groove wall of the avoidance groove 3031, so that the laser module 50 does not closely adhere to the groove wall of the avoidance groove 3031, providing a certain detection space around the laser module 50. The air flow passes through the ventilation holes, through holes or bypasses the circuit and flows into the avoidance groove 3031, filling the avoidance groove 3031, ensuring that there is detection gas around the laser module 50, improving the detection effect and accuracy.

[0149] Optionally, as Figure 11 and Figure 12 shown, the rear side wall of the housing 10 is provided with a second ventilation hole 104, which is communicated with the accommodation cavity. The outside gas can flow into the accommodation cavity through the second ventilation hole 104 and then flow to the laser module 50. The ventilation holes include the second ventilation hole 104.

[0150] In the embodiments of the present disclosure, the rear side wall of the housing 10 is also provided with a second ventilation hole 104, so that the gas can also enter the housing 10. And due to the blockage of the circuit board bracket 30, the laser module 50 is not directly facing the air flow. In this way, the external oil fume needs to pass through the same holes on the circuit board bracket 30 again to reach the laser module 50. After being filtered by the diffusion holes and the holes on the circuit board bracket 30, the entry of oil fume will be greatly reduced.

[0151] Optionally, the second ventilation hole 104 is close to the outer edge of the rear side wall of the housing 10, which can prevent the gas flowing in through the second ventilation hole 104 from directly flowing to the laser module 50, improving the air flow path and thus reducing the entry of oil fume.

[0152] Optionally, the second ventilation holes 104 are sequentially arranged at intervals along the circumferential direction of the rear side wall of the housing 10, which can not only increase the air intake of the rear side wall but also reduce the entry of oil fume.

[0153] Optionally, the support portion 304 is configured with a communication channel that communicates the outer edge of the circuit board 20 and the avoidance groove 3031, so that the air flow bypassing the circuit board 20 passes through the communication channel and flows into the avoidance groove 3031.

[0154] In the embodiments of the present disclosure, after the air flow bypasses the outer edge of the circuit board 20 and flows to the rear side of the circuit board 20, since there is a certain distance between the laser module 50 and the outer edge of the circuit board 20, the support portion 304 is configured with a communication channel to enable the gas at the outer edge of the circuit board 20 to smoothly flow into the avoidance groove 3031 where the laser module 50 is located.

[0155] Optionally, the support portion 304 is attached to the circuit board 20, and the support portion 304 is configured with a communication hole that communicates the outer edge of the circuit board 20 and the avoidance groove 3031, so that the air flow bypassing the circuit board 20 passes through the communication hole and flows into the avoidance groove 3031. The communication channel includes the communication hole.

[0156] In the embodiments of the present disclosure, when the support portion 304 is attached to the circuit board 20, the communication holes provided in the support portion 304 can communicate the outer edge of the circuit board 20 and the avoidance groove 3031, so as to ensure the supporting effect of the support portion 304 on the circuit board 20 and also ensure that the air flow can smoothly flow into the avoidance groove 3031.

[0157] Optionally, there is a gap 308 between the support portion 304 and the circuit board 20. The gap 308 communicates the outer edge of the circuit board 20 and the avoidance groove 3031, so that the air flow bypassing the circuit board 20 can pass through the gap 308 and flow into the avoidance groove 3031. The communication channel includes the gap 308.

[0158] In the embodiments of the present disclosure, a gap 308 can also be provided between the support portion 304 and the circuit board 20, so that the air flow at the edge of the circuit board 20 can smoothly flow into the avoidance groove 3031 to ensure the contact effect between the gas and the laser module 50.

[0159] Optionally, the support portion 304 is attached to the circuit board 20, and the support portion 304 is provided with a first communication hole 305. The first communication hole 305 communicates the third ventilation hole 3041 and the avoidance groove 3031. The communication hole includes the first communication hole 305.

[0160] In the embodiments of the present disclosure, when the air flow flows from back to front, the air flow passes through the third ventilation hole 3041 and flows to the side of the circuit board bracket 30 facing the circuit board 20, and then passes through the first communication hole 305 and flows into the avoidance groove 3031, so as to ensure that the air flow flowing in through the third ventilation hole 3041 can flow to the laser module 50 in the avoidance groove 3031.

[0161] Optionally, the support portion 304 is spaced from the circuit board 20, and there is a gap 308 between the support portion 304 and the circuit board 20. The gap 308 communicates the avoidance groove 3031 and the third ventilation hole 3041.

[0162] In the embodiments of the present disclosure, the gap 308 can not only communicate the outer edge of the circuit board 20 and the avoidance groove 3031, but also communicate the third ventilation hole 3041 and the avoidance groove 3031, so that when the air flow flows from the rear side to the front side of the circuit board bracket 30, it can pass through the third ventilation hole 3041 and the gap 308 and flow into the avoidance groove 3031.

[0163] Optionally, the supporting portion 304 protrudes towards the circuit board 20 from the mounting portion 301. The circuit board bracket 30 further includes: a stepped structure 311 connected between the supporting portion 304 and the mounting portion 301. When a first communication hole 305 is provided at one end of the third ventilation hole 3041 facing the avoidance groove 3031, a second communication hole 306 is further provided in the stepped structure 311. The second communication hole 306 communicates the first ventilation hole 3011 and the third ventilation hole 3041. It can be understood that the second communication hole 306 is located at the end of the third ventilation hole 3041 away from the avoidance groove 3031, and the second communication hole 306 communicates the first ventilation hole 3011 and the third ventilation hole 3041.

[0164] In the embodiment of the present disclosure, when the air flow flows from the rear side between the circuit boards 20 to the front side, if the supporting portion 304 is in contact with the circuit board 20, the air flow flowing out of the first ventilation hole 3011 can flow to the third ventilation hole 3041 through the second communication hole 306 of the stepped structure 311, and then flow radially along the circuit board bracket 30 to the first communication hole 305, and then flow from the first communication hole 305 into the avoidance groove 3031 to realize the communication between the first ventilation hole 3011 and the avoidance groove 3031.

[0165] Optionally, when there is a gap 308 between the supporting portion 304 and the circuit board 20, a third communication hole 307 is further provided in the stepped structure 311. The third communication hole 307 communicates the first ventilation hole 3011 and the third ventilation hole 3041. Since the third ventilation hole 3041 is communicated with the avoidance groove 3031 through the gap 308, the third communication hole 307 and the third ventilation hole 3041 can communicate the first communication hole 305 and the avoidance groove 3031.

[0166] In the embodiment of the present disclosure, when there is a gap 308 between the supporting portion 304 and the circuit board 20, a part of the air flow flowing out of the first ventilation hole 3011 can flow into the avoidance groove 3031 through the gap 308. At the same time, a part of the air flow can also flow into the gap 308 through the third communication hole 307 and the third ventilation port and then flow into the avoidance groove 3031 from the gap 308.

[0167] Optionally, the outer edge of the circuit board 20 protrudes from the outside of the stepped structure 311 so that the air flow at the outer edge of the circuit board 20 flows to the laser module 50 through the second communication hole 306.

[0168] In the embodiment of the present disclosure, the outer edge of the circuit board 20 protrudes radially outward from the step structure 311, so that when the support portion 304 is attached to the circuit board 20, the airflow flowing in from the first vent hole 103 bypasses the circuit board 20 and first flows to the step structure 311, then flows from the second communication hole 306 of the step structure 311 to the first communication hole 305 and then flows into the avoidance groove 3031. At this time, the communication hole includes the first communication hole 305 and the second communication hole 306, so that the airflow at the outer edge of the circuit board 20 flows to the avoidance groove 3031 through the second communication hole 306 and the first communication hole 305 in sequence, so as to achieve the connection between the outer edge of the circuit board 20 and the avoidance groove 3031.

[0169] Optionally, when the avoidance groove 3031 is provided with a second vent hole 3032 on the groove wall facing the support portion 304, the second vent hole 3032 is connected with the second connecting hole 306, and flows into the side of the support portion 304 away from the circuit board 20 through the second connecting hole 306, that is, into the side of the avoidance groove 3031. In this way, the airflow flowing into the second connecting hole 306 can not only flow into the avoidance groove 3031 from the first connecting hole 305, but also flow into the avoidance groove 3031 from the second vent hole 3032 on the groove wall of the avoidance groove 3031.

[0170] Optionally, the outer edge of the circuit board 20 protrudes out of the outer side of the step structure 311 , so that the airflow at the outer edge of the circuit board 20 flows to the laser module 50 through the third connecting hole 307 .

[0171] In the embodiment of the present disclosure, the outer edge of the circuit board 20 protrudes radially outward from the step structure 311, so that when there is a gap 308 between the support portion 304 and the circuit board 20, the airflow flowing in from the first air hole 103 bypasses the circuit board 20 and a portion of it flows directly into the avoidance groove 3031 through the gap 308, and another portion of the airflow can pass through the third connecting hole 307 of the step structure 311 and flow into the gap 308 and then into the avoidance groove 3031.

[0172] In the embodiment of the present disclosure, a variety of ventilation holes, connecting holes and gaps 308 are provided on the circuit board bracket 30, which not only enables the airflow to flow into the avoidance groove 3031 from multiple directions, but also increases the flow path of the airflow, thereby allowing the oil smoke in the airflow to be adsorbed on the flow path, thereby reducing the oil smoke flowing to the laser module 50 and increasing the service life of the laser module 50.

[0173] Optionally, when the avoidance groove 3031 is provided with a second vent hole 3032 on the groove wall facing the support portion 304, the third connecting hole 307 is connected with the second vent hole 3032, and flows into the side of the support portion 304 away from the circuit board 20 through the third connecting hole 307, that is, flows into the side of the avoidance groove 3031, so that the airflow flowing into the second connecting hole 306 can not only flow into the avoidance groove 3031 from the gap 308, but also flow into the avoidance groove 3031 from the second vent hole 3032 on the groove wall of the avoidance groove 3031.

[0174] Optionally, the housing 10 includes a front housing 101 and a rear housing 102 , and the front housing 101 and the rear housing 102 are detachably connected to facilitate disassembly of the housing 10 , and then to inspect, clean and repair the laser module 50 inside.

[0175] Optionally, the front housing 101 is snap-connected with the rear housing 102. In this way, the accommodating cavity can be opened by only separating the front housing 101 and the rear housing 102, so as to overhaul the components in the accommodating cavity.

[0176] Optionally, the front shell 101 includes a front side wall 1011 and a peripheral side wall 1012, wherein the peripheral side wall 1012 is connected to the outer edge of the front side wall 1011 and extends toward the rear side wall. The peripheral side wall 1012 is arranged in a ring shape along the circumference of the shell 10, wherein the front side wall 1011 is provided with a first air vent 103.

[0177] Optionally, the circuit board bracket 30 is detachably connected to the rear housing 102 , so that the circuit board bracket 30 can be fixed, thereby facilitating the circuit board bracket 30 to fix the circuit board 20 .

[0178] Alternatively, if Figure 6 and Figure 12 As shown, the circuit board bracket 30 is engaged with the rear housing 102. The inner side wall of the rear housing 102 is configured with a first engagement protrusion 403, and the circuit board bracket 30 is configured with a second engagement protrusion 404. When the rear housing 102 and the circuit board bracket 30 are connected, the first engagement protrusion 403 and the second engagement protrusion 404 are engaged.

[0179] Optionally, along a direction away from the circuit board 20 , the body 302 protrudes from the mounting portion 301 , and the second latching protrusion 404 is disposed on an outer edge of the body 302 , so that the second latching protrusion 404 can cooperate with the first latching protrusion 403 .

[0180] Optionally, there are multiple second latching protrusions 404 , which are arranged in sequence and spaced apart along the circumference of the body 302 , and the number of the first latching protrusions 403 is the same as the number of the second latching protrusions 404 and corresponds one to one.

[0181] Optionally, a card slot is defined by the rear end portion of the circumferential side wall 1012 and the outer edge of the circuit board bracket 30. The outer edge of the rear housing 102 is provided with a clamping portion adapted to the card slot. When the clamping portion is located in the card slot, the rear housing 102 is connected to the front housing 101 and the circuit board bracket 30.

[0182] Optionally, the rear housing 102 includes a rear housing body 40 and a connecting side wall 401. The connecting side wall 401 is connected to the outer edge of the rear housing body 40 and extends annularly along the circumference of the rear housing body 40. Along the direction from back to front, the connecting side wall 401 inclines outward. The second ventilation hole 104 is provided in the connecting side wall 401, which can increase the flow area of the second ventilation hole 104 and prevent the air flow flowing into the second ventilation hole 104 from directly flowing to the laser module 50.

[0183] Optionally, the connecting side wall 401 is sleeved outside the first convex 403. The front wall surface of the first convex 403 is spaced from the wall surface of the mounting portion 301 facing the rear housing 102. Thus, the air flow flowing into the second ventilation hole 104 can flow into the side of the circuit board bracket 30 facing the circuit board 20 through the gap between the first convex 403 and the mounting portion 301, and then flow to the laser module 50.

[0184] Optionally, the connecting side wall 401 corresponds to the mounting portion 301. The connecting side wall 401 and the mounting portion 301 define an intake space. After the air flow of the second ventilation hole 104 in the connecting side wall 401 enters the intake space, it can flow to the side of the circuit board bracket 30 facing the circuit board 20 through the first ventilation hole 3011 of the mounting portion 301, and then flow to the laser module 50.

[0185] In a specific embodiment, after the external air flow flows into the accommodation cavity from the first ventilation hole 103, a part of the air flow bypasses the circuit board and flows to the laser module on the back side of the circuit board through the gap between the circuit board and the housing or the notch of the circuit board. Another part of the air flow can directly pass through the through hole of the circuit board and flow to the laser module. Still another part of the air flow flows to the laser module through the ventilation hole of the circuit board bracket. In this way, the air flow can enter the laser module through multiple paths, ensuring the detected air flow rate, and the oil fume in the air flow can be adsorbed by multiple components, reducing the accumulation amount of oil fume on the laser module.

[0186] The external gas can also enter the accommodation cavity from the second ventilation hole. The air flow passes through the ventilation hole of the circuit board bracket or flows to the laser module through the gap between the circuit board bracket and the circuit board, thereby realizing the detection of the air flow by the laser module and reducing the accumulation of oil fume.

[0187] The above description and the accompanying drawings sufficiently illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A gas detector, characterized in that, Comprising: A housing that defines a receiving cavity. The housing is provided with ventilation holes that communicate the outside with the receiving cavity; A circuit board located within the receiving cavity; A circuit board bracket located within the receiving cavity and disposed on one side of the circuit board and connected to the circuit board; A laser module electrically connected to the circuit board, located within the receiving cavity, and disposed between the circuit board and the circuit board bracket; Wherein, the circuit board bracket is provided with ventilation holes such that the airflow flowing in through the ventilation holes passes through the ventilation holes of the circuit board bracket and reaches the laser module.

2. The gas detector according to claim 1, wherein, The circuit board bracket includes: A body corresponding to the laser module; A mounting portion connected to the outside of the body and connected to the circuit board; Wherein, the mounting portion and / or the body is provided with ventilation holes.

3. The gas detector according to claim 2, characterized in that The mounting portion is provided with first ventilation holes, and the first ventilation holes are sequentially arranged at intervals along the circumferential direction of the mounting portion. The ventilation holes include the first ventilation holes.

4. The gas detector according to claim 2, characterized in that At least a part of the body is recessed away from the circuit board to form an avoidance groove, and the laser module is located within the avoidance groove; wherein, at least one of the rear groove wall, upper groove wall, and lower groove wall of the avoidance groove is provided with second ventilation holes. The ventilation holes include the second ventilation holes.

5. The gas detector according to claim 4, characterized in that, The body includes: An avoidance portion configured with an avoidance groove; A support portion connected between the avoidance portion and the mounting portion. The support portion is provided with third ventilation holes. The ventilation holes include the third ventilation holes; Wherein, the support portion is disposed in contact with the circuit board. One end of the third ventilation hole facing the avoidance groove is provided with a first communication hole that communicates the third ventilation hole with the avoidance groove; and / or The support portion is spaced apart from the circuit board, and there is a gap between the support portion and the circuit board. The gap communicates the avoidance groove and the third ventilation hole.

6. The gas detector according to claim 5, characterized in that The support portion protrudes toward the circuit board from the mounting portion. The circuit board bracket further includes: A step structure connected between the support portion and the mounting portion; Wherein, when one end of the third ventilation hole facing the avoidance groove is provided with a first communication hole, the step structure is further provided with a second communication hole that communicates the first ventilation hole and the third ventilation hole; and / or When there is a gap between the support portion and the circuit board, the step structure is further provided with a third communication hole that communicates the first ventilation hole and the third ventilation hole.

7. The gas detector according to claim 6, characterized in that The front side wall of the housing is provided with first ventilation holes, and at least a part of the airflow flowing in through the first ventilation holes can bypass the circuit board and then flow to the laser module through the ventilation holes. The ventilation holes include the first ventilation holes.

8. The gas detector according to claim 7, characterized in that The outer edge of the circuit board protrudes beyond the outer side of the step structure, so that the airflow at the outer edge of the circuit board flows to the laser module through the second communication hole and / or the third communication hole.

9. The gas detector according to any one of claims 3 to 8, characterized in that Along the front-to-back direction, the circuit board, the laser module, and the circuit board bracket are sequentially arranged; The outer edge of the rear side wall of the housing is provided with second ventilation holes, and the number of the second ventilation holes is multiple. The multiple second ventilation holes are sequentially arranged at intervals along the circumferential direction of the housing. The ventilation holes include the second ventilation holes.

10. The gas detector according to claim 9, characterized in that, The rear side wall of the housing includes: A rear housing body; The connecting side wall is connected to the outside of the rear housing body and extends in a ring shape along the circumference of the rear housing body. Along the direction from back to front, the connecting side wall is inclined outward, and the second ventilation holes are provided in the connecting side wall; The second ventilation holes communicate with the first ventilation holes.

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