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, a first vent hole is formed in the front side wall of the shell, and the first vent hole communicates with the outside and the containing cavity; the circuit board is positioned in the accommodating cavity; the laser module is located in the containing cavity and arranged on the side, away from the front side wall, of the circuit board, so that airflow flowing in from the first air hole bypasses the circuit board and flows to the laser module. Gas entering from the first vent hole firstly diffuses in the containing cavity and then needs to bypass the circuit board 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 shell or circuit board, finally, the oil smoke flowing to the laser module is reduced, and the service life of the laser module is prolonged. In this way, the fuel gas detection function of the laser module can be guaranteed, oil smoke accumulated on the laser module can be reduced, the service life of the laser module is prolonged, and the use experience of a user is improved.

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 precision. 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 device.

[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 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. Summary of the Utility Model

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple overview is given below.

[0008] The above 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.

[0009] 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.

[0010] An embodiment of the present disclosure provides a gas detector, which includes: a housing defining an accommodation cavity, with a first ventilation hole provided on the front side wall of the housing, and the first ventilation hole communicating the outside with the accommodation cavity; a circuit board located in the accommodation cavity; a laser module electrically connected to the circuit board, located in the accommodation cavity, and provided on the side of the circuit board facing away from the front side wall, so that the airflow flowing in through the first ventilation hole bypasses the circuit board and flows to the laser module.

[0011] Optionally, a gap is formed between the outer edge of the circuit board and the inner wall surface of the housing, so that the airflow flowing in through the first ventilation hole flows to the laser module through the gap.

[0012] Optionally, a notch is provided at the outer edge of the circuit board, so that the airflow flowing in through the first ventilation hole flows to the laser module through the notch.

[0013] Optionally, the gas detector further includes: a circuit board bracket located on the side of the laser module facing away from the circuit board; wherein, the laser module is connected to the circuit board, and / or, the laser module is connected to the circuit board bracket.

[0014] Optionally, a part of the circuit board bracket is recessed in a direction away from the circuit board to form an avoidance groove, and the laser module is located in the avoidance groove.

[0015] Optionally, the laser module is spaced apart from the groove wall of the avoidance groove.

[0016] Optionally, the circuit board bracket includes: a support part; an avoidance part located on the side of the support part facing away from the outer edge of the circuit board, and configured with an avoidance groove; wherein, the support part is configured with a communication channel, and the communication channel communicates the outer edge of the circuit board and the avoidance groove, so that the airflow bypassing the circuit board passes through the communication channel and flows into the avoidance groove.

[0017] Optionally, the support part is attached to the circuit board, and the support part is configured with a communication hole, and the communication hole communicates the outer edge of the circuit board and the avoidance groove, so that the airflow bypassing the circuit board passes through the communication hole and flows into the avoidance groove, and the communication channel includes the communication hole; and / or, there is a gap between the support part and the circuit board, and the gap communicates the outer edge of the circuit board and the avoidance groove, so that the airflow bypassing the circuit board passes through the gap and flows into the avoidance groove, and the communication channel includes the gap.

[0018] Optionally, the circuit board bracket is detachably connected to the circuit board.

[0019] Optionally, the laser module corresponds to the middle part of the circuit board.

[0020] The gas detector provided by the embodiment of the present disclosure can achieve the following technical effects:

[0021] In the gas detector according to the embodiments of the present disclosure, the front side wall of the housing is provided with a first ventilation hole, and the laser module is located on the side of the circuit board away from the front side wall. In this way, the gas entering through the first ventilation hole first diffuses in the accommodation cavity, and then needs to bypass the circuit board to reach the position of the laser module. This extends the path of the air flow to the laser module, and part of the oil fume in the air flow can be adsorbed on the passing housing or circuit board, finally reducing the oil fume flowing to the laser module. 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, thereby improving the user experience.

[0022] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by the corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0024] Figure 1 is a schematic structural diagram of a perspective view of a gas detector provided by an embodiment of the present disclosure;

[0025] Figure 2 is an exploded structural diagram of a gas detector provided by an embodiment of the present disclosure;

[0026] Figure 3 is a schematic structural diagram of a partial structure of a gas detector provided by an embodiment of the present disclosure;

[0027] Figure 4 is another schematic structural diagram of a partial structure of a gas detector provided by an embodiment of the present disclosure;

[0028] Figure 5 is another schematic structural diagram of a partial structure of a gas detector provided by an embodiment of the present disclosure;

[0029] Figure 6 is a schematic structural diagram of a perspective view of a circuit board bracket provided by an embodiment of the present disclosure;

[0030] Figure 7 is a schematic structural diagram of another perspective view of a circuit board bracket provided by an embodiment of the present disclosure;

[0031] Figure 8 is another schematic structural diagram of a partial structure of a gas detector provided by an embodiment of the present disclosure;

[0032] Figure 9 is a schematic cross-sectional structure diagram of a gas detector provided by an embodiment of the present disclosure;

[0033] Figure 10 is a schematic structural diagram of a circuit board provided by an embodiment of the present disclosure;

[0034] Figure 11 is a schematic structural diagram of a perspective of a rear housing provided by an embodiment of the present disclosure;

[0035] Figure 12 is a schematic structural diagram of another perspective of a rear housing provided by an embodiment of the present disclosure;

[0036] Figure 13 is another schematic sectional structural diagram of a gas detector provided by an embodiment of the present disclosure;

[0037] Figure 14 is a schematic structural diagram of a front housing provided by an embodiment of the present disclosure.

[0038] Reference numerals:

[0039] 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, connection hole; 204, gap; 205, notch; 206, first notch; 207, second notch; 30, circuit board bracket; 301, installation 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, stepped structure; 40, rear housing body; 401, connection side wall; 403, first clamping protrusion; 404, second clamping protrusion; 50, laser module. Detailed implementation manners

[0040] 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 attached drawings are only for reference and explanation purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a sufficient understanding of the disclosed embodiments is provided through multiple details. 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.

[0041] In the description, claims, and the above-mentioned drawings of the embodiments of the present disclosure, terms such as "first" and "second" are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to describe the embodiments of the present disclosure here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0042] In the embodiments of the present disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", and "rear" 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 device, element, or component 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.

[0043] 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 directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements, or components. 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.

[0044] Unless otherwise specified, the term "plurality" means two or more.

[0045] The term "and / or" is a description of the associated relationship of an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0046] It should be noted that, without conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0047] For the sake of convenience of description, the front-rear direction of this application is as Figure 2 shown.

[0048] Figure 2 The thin line arrows on both sides of the circuit board in

[0049] Combined Figures 1 to 14 As shown, an embodiment of the present disclosure provides a gas detector, which includes a housing 10. The housing 10 defines a receiving cavity, and the housing 10 is provided with air vents that communicate the outside and the receiving cavity, so that the gas outside can flow into the receiving cavity through the air vents.

[0050] Optionally, a first air vent 103 is provided on the front side wall 1011 of the housing 10, and the first air vent 103 communicates the outside with the receiving cavity. The gas outside flows into the receiving cavity through the first air vent 103, where the air vent includes the first air vent 103.

[0051] Optionally, the number of the first air vents 103 is multiple, which can increase the inflow of gas.

[0052] Optionally, as Figure 1 shown, multiple first air vents 103 are sequentially and spaced apart along the radial direction of the front side wall 1011 of the housing 10 to form a first air vent group. The number of the first air vent groups is multiple, and the multiple first air vent groups are sequentially and spaced apart along the circumferential direction of the front side wall 1011 of the housing 10. In this way, the number of the first air vents 103 can be increased in both the radial and circumferential directions of the front side wall 1011 of the housing 10, and the air permeability is improved.

[0053] 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.

[0054] 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 receiving cavity. The laser module 50 is provided on a side of the circuit board 20 away from the front side wall 1011, so that the airflow flowing in through the first air vent 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.

[0055] In the embodiments of the present disclosure, the laser module 50 has multiple advantages in the field of gas detection, including long-distance detection, high precision, fast response, high system stability and reliability, and multi-gas detection capabilities, providing effective technical support for gas safety monitoring. The laser module 50 is disposed on the side of the circuit board 20 facing away from the front side wall 1011. The laser module 50 does not face the first ventilation hole 103 directly, avoiding the laser module 50 being exposed to the oil fume environment. External gas first diffuses into the accommodation cavity through the first ventilation hole 103 on the front side wall 1011 and reaches the area where the laser module 50 is located only after bypassing the circuit board 20. This extends the flow path of the air flow in the accommodation cavity. During this process, part of the oil fume will be adsorbed onto the passing housing 10 or 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.

[0056] 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 air flow exceeds a preset value, the circuit board can determine whether natural gas leaks, thereby achieving the detection effect.

[0057] 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 hole 103 flows to the laser module 50 through the gap 204.

[0058] 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. After the air flow flowing in through the first ventilation hole 103 encounters the obstruction of 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 flows to the laser module 50 on the back of the circuit board 20 to ensure the detection function of the laser module 50.

[0059] Optionally, the gap 204 extends in a ring shape or is segmented along the circumference of the circuit board 20.

[0060] In the embodiments of the present disclosure, the gap 204 can extend in a ring shape, which can increase the flow area of the air flow in the circumferential direction and improve the uniformity of the air flow. The gap 204 can also be segmented, 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, ensuring the size of the gap 204 to the greatest extent.

[0061] 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.

[0062] 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 holes flows to the laser module 50 through the notch 205.

[0063] In the embodiment 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 to increase the flow area of the air flow and ensure the air flow rate flowing to the laser module 50.

[0064] Optionally, the outer edge of the circuit board 20 is recessed towards the center of the circuit board 20 to form a notch 205.

[0065] Optionally, the number of 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 amount of gas flowing from the first ventilation hole 103 to the gas module, thereby improving the detection efficiency of the laser module 50.

[0066] Optionally, as Figure 4 shown, the laser module 50 is in contact with the circuit board 20.

[0067] In the embodiment 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-rear direction, thereby reducing the volume of the gas detector and facilitating the installation and use of the gas detector.

[0068] Optionally, the laser module 50 is connected to the circuit board 20.

[0069] In the embodiment of the present disclosure, the laser module 50 can be connected to the circuit board 20, which can realize the fixation of the laser module 50.

[0070] 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 bonded to the circuit board 20.

[0071] 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.

[0072] Exemplarily, the laser module 50 and the circuit board 20 can be connected by means of snap connection, magnetic attraction or screws.

[0073] Optionally, as Figure 2 , Figures 4 to 9 shown, the gas detector further includes a circuit board support 30, and the circuit board support 30 is located on the side of the laser module 50 away from the circuit board 20.

[0074] In the embodiment 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 support 30, and the rear side wall of the housing are arranged in sequence. The circuit board support 30 is located on the side of the laser module 50 away from the circuit board 20, and the circuit board support 30 is used to fix the circuit board 20.

[0075] Optionally, the circuit board support 30 and the circuit board 20 are arranged at intervals, so that the airflow bypassing the circumference of the circuit board 20 can smoothly flow to the laser module 50.

[0076] Optionally, the laser module 50 is connected to the circuit board support 30.

[0077] In the embodiment of the present disclosure, the laser module 50 can also be arranged on the circuit board support 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 is also convenient for the disassembly of the laser module 50.

[0078] Optionally, the laser module 50 is detachably connected to the circuit board support 30. This is convenient for the disassembly, maintenance and cleaning of the laser module 50.

[0079] Exemplarily, the laser module 50 and the circuit board support 30 are detachably connected by means of snap connection, magnetic attraction or screws.

[0080] Optionally, the laser module 50 is fixedly connected to the circuit board support 30. The connection stability between the laser module 50 and the circuit support can be improved, and the laser module 50 can be prevented from falling off.

[0081] Exemplarily, the laser module 50 and the circuit board support 30 can be fixedly connected by means of bonding.

[0082] Optionally, the laser module 50 can be connected to both the circuit board support 30 and the circuit board 20.

[0083] It should be noted that: the laser module 50 in the embodiment of the present disclosure is always communicatively connected to the circuit board, and the connection methods between the laser module 50 and the circuit board or the circuit board support mentioned above are mainly mechanical connections.

[0084] Optionally, as Figures 4 to 9As shown, the circuit board bracket 30 is recessed in a direction away from the circuit board 20 to form an avoidance groove 3031, and the laser module 50 is located in the avoidance groove 3031.

[0085] In the embodiment of the present disclosure, the circuit board bracket 30 forms an avoidance groove 3031, and 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 can also increase the space around the laser module 50 to facilitate the flow of air into the laser module 50.

[0086] Optionally, the avoidance groove 3031 matches the laser module 50, that is, 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.

[0087] Optionally, the size of the avoidance groove 3031 is larger than the size of the laser module 50 to facilitate the cooperation between the laser module 50 and the avoidance groove 3031.

[0088] Optionally, as Figure 5 shown, the circuit board bracket 30 is detachably connected to the circuit board 20.

[0089] In the embodiment of the present disclosure, the circuit board bracket 30 is detachably connected to the circuit board 20, so that 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.

[0090] Optionally, as Figure 5 shown, the outer edge of the circuit board bracket 30 is provided with a hook 309, the hook 309 extends in the direction towards the circuit board 20, the hook 309 is adapted to the outer edge of the circuit board 20, and when the outer edge of the circuit board 20 is located within the hook 309, the circuit board 20 is connected to the circuit board bracket 30.

[0091] In the embodiment of the present disclosure, the outer edge of the circuit board bracket 30 is provided with a hook 309, and the hook 309 can be engaged with the outer edge of the circuit board 20, thus realizing the fixation of the circuit board 20 by the circuit board bracket 30.

[0092] Optionally, the number of the hooks 309 is multiple, and the multiple hooks 309 are sequentially arranged at intervals along the circumferential direction of the circuit board bracket 30, which can improve the connection between the circuit board bracket 30 and the circuit board 20.

[0093] 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 realizing the stable connection of the circuit board 20.

[0094] Optionally, as Figure 14As 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 .

[0095] 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.

[0096] 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 .

[0097] 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 .

[0098] 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.

[0099] Alternatively, if Figure 13 As shown, the engaging groove 105 corresponds to the edge of the notch 205 .

[0100] In the disclosed embodiment, the snap-in groove 105 corresponds to the edge of the notch 205 , that is, the snap-in groove 105 is snap-fitted to the edge of the notch 205 , which can not only fix the notch 205 , but also reduce the obstruction of the notch 205 by the snap-in groove 105 , thereby ensuring the flow area of the notch 205 .

[0101] Optionally, the laser module 50 corresponds to the middle portion of the circuit board 20 , and the laser module 50 extends along the radial direction of the circuit board 20 .

[0102] In the disclosed embodiment, the laser module 50 corresponds to the middle of the circuit board 20, so that the airflow flowing in from the circumference of the circuit board 20 can reach the laser module 50, improving the uniformity of the airflow flowing to the laser module 50. When the size of the laser module 50 is large, the laser module 50 extends along the radial direction of the circuit board 20, which facilitates the installation and setting of the laser module 50.

[0103] Optionally, the outer edge of the laser module 50 is located on the inner side of the outer edge of the circuit board 20, that is, the laser module 50 will not protrude from the outer edge of the circuit board 20. This can avoid the laser module 50 protruding from the circuit board 20 and causing the size of the gas detector to increase, thereby improving the convenience of use and installation of the gas detector.

[0104] Optionally, the laser module 50 is in a strip shape, and the laser module 50 extends along the diameter of the circuit board 20 .

[0105] Alternatively, if Figure 5 and Figure 10 As shown, the circuit board 20 is provided with a through hole, so that at least part of the gas flowing into the first air hole 103 flows through the through hole to the laser module 50 .

[0106] In the disclosed embodiment, the circuit board 20 is provided with a through hole, and at least part of the gas flowing into the first air hole 103 can also flow through the through hole of the circuit board 20 to the laser module 50 on the back side of the circuit board 20. In this way, a part of the oil fume in the airflow flowing to the laser module 50 will be absorbed by the circuit board 20, thereby reducing the oil fume accumulated on 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, thereby increasing the service life of the laser module 50, and reduce the frequency of user cleaning, thereby improving the user experience.

[0107] Optionally, the through holes and the solder joints of the circuit board 20 are staggered.

[0108] In the disclosed embodiment, the through holes and the solder joints of the circuit board 20 are staggered, which can ensure the normal operation of the circuit board 20 and the setting of the through holes.

[0109] Optionally, the through hole is arranged in a bare copper area of the circuit board.

[0110] Optionally, there are multiple through holes, and the multiple through holes are arranged on the circuit board 20 at intervals.

[0111] In the disclosed embodiment, the circuit board 20 is provided with a plurality of through holes, which can increase the total flow area of the through holes, thereby increasing the amount of airflow to the laser module 50 and ensuring the detection efficiency of the laser module 50 .

[0112] Alternatively, if Figure 5 As shown, the multiple through holes include a first through hole 201 and a second through hole 202, wherein the second through hole 202 is located outside the first through hole 201 and 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. There are relatively many solder joints provided on the inner side of the circuit board 20. Therefore, the opening area of the first through-hole 201 is relatively small, 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. There are relatively few solder joints near the outer edge of the circuit board 20. The opening area of the second through-hole 202 is relatively large, 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 being located outside the first through-hole 201 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 arranged at intervals along the circumferential direction of the circuit board 20.

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

[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, which can 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 flowing portion. The connecting portion is detachably connected to the housing 10; the flowing portion is provided with a notch 205, and the flowing 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, and 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. The other end of the first connecting side and the other end of the second connecting side are located inside the connecting portion. In this way, it can not only increase the flow area of the first notch 206, but also ensure the strength of the circuit board 20.

[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. In this way, it can 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 edge. Both ends of the second connecting edge are respectively connected to the connecting portion. In this way, the second notch 207 can be arranged at the position where the circuit board 20 has fewer solder joints, so as to increase the flow 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, so as to increase 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 at the connecting portion.

[0124] In the embodiment of the present disclosure, a notch 205 is arranged at the flow-through portion, and the gas flowing in through the first ventilation hole 103 can flow to the laser module 50 through the notch 205. The connecting portion is connected to the housing 10. That is to say, the distance between the connecting portion and the housing 10 is relatively close. Therefore, the second through hole 202 is arranged at the connecting portion, 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, so as to 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, a connection hole 203 is further formed in the circuit board 20, and the connection hole 203 corresponds to the stud 310, and the stud 310 passes 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. In this way, not only the connection stability of the circuit board 20 can be improved, but also the connection hole 203 is convenient for 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 air flow flowing in through the ventilation holes passes through the ventilation holes of the circuit board bracket 30 and flows to the laser module 50.

[0129] In the embodiments 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 extends the path of the airflow flowing to the laser module 50, and part of the oil fume in the airflow can be adsorbed on the passing circuit board bracket 30, ultimately 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, thereby improving the user experience.

[0130] 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; wherein, the mounting portion 301 and / or the body 302 is provided with ventilation holes.

[0131] In the embodiments 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, and both the mounting portion 301 and the body 302 are provided with ventilation holes so that the airflow can flow to the laser module 50 from multiple directions.

[0132] Optionally, as Figure 7 shown, at least 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 embodiments 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.

[0133] Optionally, the mounting portion 301 is annular, and 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.

[0134] In the embodiments 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 the airflow can flow from the circumference between the circuit boards 20 to the laser module 50, improving the air flow rate and flow uniformity.

[0135] 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.

[0136] Optionally, as Figure 7 and Figure 8As 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 a second ventilation hole 3032. The ventilation holes include the second ventilation hole 3032.

[0137] In the embodiments of the present disclosure, 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, thereby increasing the inflow of air flow and ensuring the detection efficiency of the laser module 50.

[0138] Optionally, the second ventilation hole 3032 is in a long strip shape, which can increase the flow area of the second ventilation hole 3032.

[0139] Optionally, multiple second ventilation holes 3032 are arranged side by side at intervals to further increase the flow area.

[0140] Optionally, the main body 302 includes an avoidance portion 303 and a support portion 304. The avoidance portion 303 is configured with an avoidance groove 3031; the support portion 304 is connected between the avoidance portion 303 and the mounting portion 301, and the avoidance portion 303 is located on one side of the support portion 304 away from the outer edge of the circuit board 20; wherein, the support portion 304 is provided with a third ventilation hole 3041. The ventilation holes include the third ventilation hole 3041.

[0141] In the embodiments of the present disclosure, 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 ventilation hole 3041, so that air flow can also flow into the laser module 50 from the second ventilation hole 3032, increasing the gas flow rate.

[0142] Optionally, the avoidance groove 3031 is located in the middle of the main body 302, and support portions 304 are provided on both sides of the avoidance groove 3031. Each support portion 304 is provided with a third ventilation hole 3041, so that air flow can flow into both sides of the avoidance groove 3031, increasing the inflow of air flow and further improving the detection efficiency of the laser module 50.

[0143] Optionally, as Figure 4 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.

[0144] Optionally, the support portion 304 protrudes from the mounting portion 301 in the direction towards 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 communicated with 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.

[0145] Optionally, the hook 309 protrudes towards the circuit board 20 from the support portion 304, so that the circuit board 20 can be engaged with the hook 309, and the circuit board 20 will not directly interfere with the circuit board 20.

[0146] Optionally, the laser module 50 is spaced apart from the wall of the avoidance groove 3031.

[0147] In the embodiment of the present disclosure, the laser module 50 is spaced apart from the wall of the avoidance groove 3031, so that the laser module 50 does not closely adjoin the wall of the avoidance groove 3031, and a certain detection space is provided 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, and can fill the avoidance groove 3031, so that the detection gas exists in the circumferential direction of the laser module 50, improving the detection effect and detection accuracy.

[0148] Optionally, as Figure 11 and Figure 12 shown, a second ventilation hole 104 is formed in the rear side wall of the housing 10, and the second ventilation hole 104 communicates 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. The ventilation holes include the second ventilation hole 104.

[0149] In the embodiment of the present disclosure, the rear side wall of the housing 10 is also provided with the 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 ventilation holes on the circuit board bracket 30 again to reach the laser module 50. After being filtered by the two layers of the second ventilation hole 104 and the holes of the circuit board bracket 30, the entry of the oil fume will be greatly reduced.

[0150] Optionally, the second ventilation hole 104 is close to the outer edge of the rear side wall of the housing 10, so as to 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 the oil fume.

[0151] Optionally, the second ventilation holes 104 are sequentially and spaced apart along the circumferential direction of the rear side wall of the housing 10, so that both the air intake amount of the rear side wall can be increased and the entry of the oil fume can be reduced.

[0152] 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 can pass through the communication channel and flow into the avoidance groove 3031.

[0153] 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, therefore, the support portion 304 is configured with a communication channel, which can 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.

[0154] Optionally, the support portion 304 is attached to the circuit board 20, and the support portion 304 is configured with a communication hole, and the communication hole 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, and the communication channel includes the communication hole.

[0155] In the embodiments of the present disclosure, when the support portion 304 is attached to the circuit board 20, the communication hole provided in the support portion 304 can communicate the outer edge of the circuit board 20 and the avoidance groove 3031, which can ensure the supporting effect of the support portion 304 on the circuit board 20 and also ensure the smooth flow of the air flow into the avoidance groove 3031.

[0156] Optionally, there is a gap 308 between the support portion 304 and the circuit board 20, and 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 passes through the gap 308 and flows into the avoidance groove 3031, and the communication channel includes the gap 308.

[0157] 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.

[0158] 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, and the first communication hole 305 communicates the third ventilation hole 3041 and the avoidance groove 3031, and the communication hole includes the first communication hole 305.

[0159] In the embodiments of the present disclosure, when the air flow flows from the rear to the 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 that it can be ensured that the air flow flowing in through the third ventilation hole 3041 can flow to the laser module 50 in the avoidance groove 3031.

[0160] 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, and the gap 308 communicates the avoidance groove 3031 and the third ventilation hole 3041.

[0161] In the embodiments of the present disclosure, the gap 308 can not only connect the outer edge of the circuit board 20 with the avoidance groove 3031, but also connect the third ventilation hole 3041 with the avoidance groove 3031, so that when the air flow flows forward from the rear side of the circuit board bracket 30, it can flow into the avoidance groove 3031 through the third ventilation hole 3041 and the gap 308.

[0162] Optionally, the support portion 304 protrudes towards the circuit board 20 from the mounting portion 301. The circuit board bracket 30 further includes: a step structure 311 connected between the support portion 304 and the mounting portion 301; wherein, 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 step structure 311, and the second communication hole 306 connects 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 connects the first ventilation hole 3011 and the third ventilation hole 3041.

[0163] In the embodiments of the present disclosure, when the air flow flows from the rear side to the front side between the circuit boards 20, if the support 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 step structure 311, 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 connection between the first ventilation hole 3011 and the avoidance groove 3031.

[0164] Optionally, when there is a gap 308 between the support portion 304 and the circuit board 20, a third communication hole 307 is further provided in the step structure 311, and the third communication hole 307 connects the first ventilation hole 3011 and the third ventilation hole 3041. Since the third ventilation hole 3041 is connected to the avoidance groove 3031 through the gap 308, the third communication hole 307 and the third ventilation hole 3041 can connect the first communication hole 305 and the avoidance groove 3031.

[0165] In the embodiments of the present disclosure, when there is a gap 308 between the support 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.

[0166] Optionally, the outer edge of the circuit board 20 protrudes outside the step 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.

[0167] In the embodiments of the present disclosure, the outer edge of the circuit board 20 protrudes beyond the outer side in the radial direction of the stepped structure 311. In this way, when the supporting portion 304 is attached to the circuit board 20, the air flow flowing into the first ventilation hole 103 bypasses the circuit board 20 and first flows to the stepped structure 311, and then flows into the first communication hole 305 through the second communication hole 306 of the stepped structure 311 and then into the avoidance groove 3031. At this time, the communication holes include the first communication hole 305 and the second communication hole 306. In this way, the air flow at the outer edge of the circuit board 20 sequentially passes through the second communication hole 306 and the first communication hole 305 and flows into the avoidance groove 3031 to realize the communication between the outer edge of the circuit board 20 and the avoidance groove 3031.

[0168] Optionally, when the groove wall of the avoidance groove 3031 facing the supporting portion 304 is provided with a second ventilation hole 3032, the second ventilation hole 3032 is communicated with the second communication hole 306, and the air flow flowing into the second communication hole 306 flows to the side of the supporting portion 304 away from the circuit board 20, that is, the side flowing into the avoidance groove 3031. In this way, the air flow flowing into the second communication hole 306 can not only flow into the avoidance groove 3031 through the first communication hole 305, but also flow into the avoidance groove 3031 through the second ventilation hole 3032 on the groove wall of the avoidance groove 3031.

[0169] Optionally, the outer edge of the circuit board 20 protrudes beyond the outer side 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 third communication hole 307.

[0170] In the embodiments of the present disclosure, the outer edge of the circuit board 20 protrudes beyond the outer side in the radial direction of the stepped structure 311. In this way, when there is a gap 308 between the supporting portion 304 and the circuit board 20, a part of the air flow flowing into the first ventilation hole 103 bypasses the circuit board 20 and directly flows into the avoidance groove 3031 through the gap 308, and another part of the air flow can flow into the gap 308 through the third communication hole 307 of the stepped structure 311 and then into the avoidance groove 3031.

[0171] In the embodiments of the present disclosure, by providing a variety of ventilation holes, communication holes and gaps 308 in the circuit board bracket 30, not only can the air flow flow to the avoidance groove 3031 from multiple directions be realized, but also the flow path of the air flow is increased. Furthermore, the oil fume in the air flow can be adsorbed on the flowing path, the oil fume flowing to the laser module 50 is reduced, and the service life of the laser module 50 is improved.

[0172] Optionally, when the avoidance groove 3031 is provided with a second ventilation hole 3032 facing the groove wall of the support portion 304, the third communication hole 307 is communicated with the second ventilation hole 3032, and flows into the side of the support portion 304 facing away from the circuit board 20, that is, the side flowing into the avoidance groove 3031. In this way, the air flow flowing in through the second communication hole 306 can not only flow into the avoidance groove 3031 from the gap 308, but also flow into the avoidance groove 3031 through the second ventilation hole 3032 on the groove wall of the avoidance groove 3031.

[0173] 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, so as to facilitate the disassembly of the housing 10, and further perform maintenance, cleaning and repair on the internal laser module 50.

[0174] Optionally, the front housing 101 and the rear housing 102 are snap-connected. In this way, only by separating the front housing 101 and the rear housing 102 can the accommodation cavity be opened, so as to facilitate the maintenance of the components in the accommodation cavity.

[0175] Optionally, the front housing 101 includes a front side wall 1011 and a peripheral side wall 1012. The peripheral side wall 1012 is connected to the outer edge of the front side wall 1011, and the peripheral side wall 1012 extends towards the rear side wall. The peripheral side wall 1012 is arranged in a ring shape along the circumference of the housing 10. Among them, the front side wall 1011 is provided with a first ventilation hole 103.

[0176] Optionally, the circuit board bracket 30 and the rear housing 102 are detachably connected, so that the circuit board bracket 30 can be fixed, and further facilitate the circuit board bracket 30 to fix the circuit board 20.

[0177] Optionally, as Figure 6 and Figure 12 shown, the circuit board bracket 30 and the rear housing 102 are snap-connected. A first snap projection 403 is formed on the inner side wall of the rear housing 102, and a second snap projection 404 is formed on the circuit board bracket 30. When the rear housing 102 and the circuit board bracket 30 are connected, the first snap projection 403 and the second snap projection 404 are snap-connected.

[0178] Optionally, along the direction away from the circuit board 20, the body 302 protrudes from the mounting portion 301, and the second snap projection 404 is provided on the outer edge of the body 302, so that the second snap projection 404 can cooperate with the first snap projection 403.

[0179] Optionally, the number of the second snap projections 404 is multiple, and the multiple second snap projections 404 are arranged at intervals in sequence along the circumference of the body 302, and the number of the first snap projections 403 is the same as that of the second snap projections 404 and corresponds one by one.

[0180] 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. A clamping portion is provided on the outer edge of the rear housing 102. The clamping portion is 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.

[0181] 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. Wherein, along the direction from back to front, the connecting side wall 401 inclines outwards. The second ventilation hole 104 is provided on the connecting side wall 401, which can increase the flow area of the second ventilation hole 104 and prevent the airflow flowing into the second ventilation hole 104 from directly flowing to the laser module 50.

[0182] Optionally, the connecting side wall 401 is sleeved on the outside of 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. In this way, the airflow 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.

[0183] Optionally, the connecting side wall 401 corresponds to the mounting portion 301. The connecting side wall 401 and the mounting portion 301 enclose an intake space. After the airflow of the second ventilation hole 104 on 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.

[0184] In a specific embodiment, after the external airflow flows into the accommodation cavity from the first ventilation hole 103, a part of the airflow 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 airflow can directly pass through the through hole of the circuit board and flow to the laser module. Another part of the airflow flows to the laser module through the ventilation hole of the circuit board bracket. In this way, the airflow can enter the laser module through multiple paths, ensuring the detected air flow rate, and the oil fume in the airflow can be adsorbed by multiple components, reducing the oil fume accumulation amount of the laser module.

[0185] The external gas can also enter the accommodation cavity from the second ventilation hole. The airflow 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 airflow by the laser module and reducing the accumulation of oil fume.

[0186] 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 that have been 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 front sidewall of the housing is provided with a first ventilation hole that communicates the outside with the receiving cavity. A circuit board located within the receiving cavity. A laser module electrically connected to the circuit board, located within the receiving cavity, and disposed on a side of the circuit board facing away from the front sidewall, such that the airflow flowing in through the first ventilation hole bypasses the circuit board and flows to the laser module.

2. The gas detector according to claim 1, wherein A gap is formed between the outer edge of the circuit board and the inner wall surface of the housing, such that the airflow flowing in through the first ventilation hole passes through the gap and flows to the laser module.

3. The gas detector according to claim 1, wherein A notch is provided at the outer edge of the circuit board, such that the airflow flowing in through the first ventilation hole passes through the notch and flows to the laser module.

4. The gas detector according to claim 1, characterized in that, Further comprising: A circuit board bracket located on a side of the laser module facing away from the circuit board. Wherein, the laser module is connected to the circuit board, and / or, the laser module is connected to the circuit board bracket.

5. The gas detector according to claim 4, wherein The circuit board bracket is partially recessed in a direction away from the circuit board to form an avoidance groove, and the laser module is located within the avoidance groove.

6. The gas detector according to claim 5, wherein The laser module is spaced apart from the groove wall of the avoidance groove.

7. The gas detector according to claim 5, wherein, The circuit board bracket comprises: A support portion; An avoidance portion located on a side of the support portion facing away from the outer edge of the circuit board, and the avoidance portion is configured with an avoidance groove. Wherein, the support portion is configured with a communication channel that communicates the outer edge of the circuit board and the avoidance groove, such that the airflow bypassing the circuit board passes through the communication channel and flows into the avoidance groove.

8. The gas detector according to claim 7, wherein The support portion is in contact with the circuit board, and the support portion is configured with a communication hole that communicates the outer edge of the circuit board and the avoidance groove, such that the airflow bypassing the circuit board passes through the communication hole and flows into the avoidance groove, and the communication channel includes the communication hole; and / or, A gap exists between the support portion and the circuit board, and the gap communicates the outer edge of the circuit board and the avoidance groove, such that the airflow bypassing the circuit board passes through the gap and flows into the avoidance groove, and the communication channel includes the gap.

9. The gas detector according to claim 4, wherein The circuit board bracket is detachably connected to the circuit board.

10. The gas detector according to any one of claims 1 to 9, wherein The laser module corresponds to the middle of the circuit board.

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