Household combustible gas alarm

Abstract

The utility model discloses a household combustible gas alarm. The household combustible gas alarm comprises a housing assembly, a circuit assembly and a cover plate. The shell assembly is provided with a containing cavity, the first end of the shell assembly is provided with an access hole penetrating through the first end in the wall thickness direction of the first end, and the access hole communicates with the containing cavity. The circuit assembly comprises a circuit board and a sensor, the circuit board and the sensor are both located in the containing cavity, the sensor is detachably connected to the circuit board, the sensor is located between the first end and the circuit board, and the sensor is arranged opposite to the manhole in the wall thickness direction. The cover plate is detachably arranged on the access hole so that the access hole can be closed or opened. According to the household combustible gas alarm, the positions of the sensor, the circuit board and the access hole are reasonably arranged, so that when the access hole is opened, the sensor is exposed, the sensor can be detached through the access hole, and the sensor is easy to clean and replace.

Description

Technical Field

[0001] The utility model relates to the technical field of gas alarm devices, and particularly relates to a household combustible gas alarm. Background Art

[0002] What is provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Common alarms are extremely vulnerable to the oil fume generated during cooking, which affects the sensors in the alarms, resulting in decreased sensitivity, false alarms, and reduced lifespan.

[0004] However, the existing household combustible gas alarm products do not consider the problem of cleaning and replacing sensors, and it is difficult to clean and replace the sensors in household combustible gas alarms. Summary of the Utility Model

[0005] The purpose of the utility model is to at least solve the problem that sensors are difficult to clean and replace. This purpose is achieved through the following technical solutions:

[0006] The utility model provides a household combustible gas alarm, which includes a housing assembly, a circuit assembly, and a cover plate. The housing assembly is provided with a receiving cavity, and a maintenance hole is provided at the first end of the housing assembly, penetrating the first end along the wall thickness direction of the first end, and the maintenance hole is communicated with the receiving cavity. The circuit assembly includes a circuit board and a sensor, both the circuit board and the sensor are located in the receiving cavity, the sensor is detachably connected to the circuit board, the sensor is located between the first end and the circuit board, and the sensor is disposed opposite to the maintenance hole in the wall thickness direction. The cover plate is detachably disposed on the maintenance hole to be able to close or open the maintenance hole.

[0007] According to the household combustible gas alarm of the utility model, by reasonably arranging the positions of the sensor, the circuit board, and the maintenance hole, when the maintenance hole is opened, the sensor is exposed, so that the sensor can be disassembled through the maintenance hole, thereby facilitating the cleaning and replacement of the sensor.

[0008] In addition, according to the household combustible gas alarm of the utility model, the following additional technical features may also be provided:

[0009] In some embodiments, the housing assembly includes a first housing and a second housing, the second housing defines the receiving cavity with an opening provided at the second end of the second housing, the first housing is disposed at the second end to cover the opening, and the first housing has the first end.

[0010] In some embodiments, a functional area is provided at a third end of the second housing, and a plurality of ventilation hole groups are arranged at intervals in the circumferential direction of the functional area. Each ventilation hole group includes a first ventilation hole arranged at intervals in the inner and outer directions. The first ventilation hole communicates with the accommodation cavity. A second ventilation hole communicating with the accommodation cavity is provided on a side wall of the second housing. A third ventilation hole communicating with the accommodation cavity is provided at the first end of the first housing. The second housing is provided with a key hole, the inner wall of the key hole is arc-shaped, the key hole is located in the functional area, and the third end and the second end are oppositely arranged in the wall thickness direction.

[0011] In some embodiments, one of the first housing and the second housing is provided with a first engaging portion, and the other of the first housing and the second housing is provided with a second engaging portion, and the first engaging portion and the second engaging portion are engaged.

[0012] In some embodiments, the first engaging portion includes a guiding portion and an abutting portion connected to each other. The second engaging portion has a preset length, and the second engaging portion forms a preset angle with the wall thickness direction. The second engaging portion is configured to be displaced under extrusion when sliding along the guiding portion toward the abutting portion so as to be able to slide along the guiding portion. The second engaging portion is further configured to be reset when disengaging from the guiding portion so as to be able to engage with the abutting portion.

[0013] In some embodiments, the circuit assembly further includes a wiring terminal. The wiring terminal is arranged on the circuit board. A wiring hole penetrating through the first end in the wall thickness direction is provided at the first end of the first housing. The wiring terminal is located between the first end and the circuit board. The sensor is oppositely arranged with the wiring hole in the wall thickness direction. A wiring board covering the wiring hole is provided at the first end. The wiring board is configured to be separated from the first end when subjected to a preset force.

[0014] In some embodiments, the wiring board is connected to the wiring hole through a connecting rib, and the connecting rib is configured to be damaged when subjected to the preset force.

[0015] In some embodiments, a connecting buckle is provided on the first housing or the second housing. The household combustible gas alarm further includes a mounting bracket. The mounting bracket is provided with a mounting hole. The mounting bracket is rotatably arranged on the second housing between a mounting position and a separation position. The mounting bracket at the mounting position is connected to the connecting buckle, and the mounting bracket at the separation position is separated from the connecting buckle.

[0016] In some embodiments, the connection buckle is provided with a first rib, the mounting bracket is provided with a plurality of second ribs, the second ribs are arranged at intervals along the circumferential direction of the mounting bracket. When the mounting bracket is located at the mounting position, the first rib is located between two adjacent second ribs. The first rib and the second rib are configured to generate resistance when moving relative to each other and contacting each other to prevent relative rotation between the mounting bracket and the connection buckle; and / or, the mounting bracket is provided with a mounting notch. When the mounting bracket is located at the separation position, the connection buckle is located in the mounting notch so as to be separable from the mounting bracket.

[0017] In some embodiments, the sensor includes a main body and a pin that are connected to each other. The circuit board is provided with a socket adapted to the pin. The main body is inserted into the socket through the pin. The cover plate is provided with a reset post that abuts against the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0019] Figure 1 is a schematic diagram of a household combustible gas alarm according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a partial structural schematic diagram of the household combustible gas alarm in

[0021] Figure 3 is Figure 2 a partial structural schematic diagram of the household combustible gas alarm in

[0022] Figure 4 is Figure 1 a sectional view of the household combustible gas alarm in

[0023] Figure 5 is a schematic diagram of the assembly of the first housing and the second housing according to an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of the second housing according to an embodiment of the present invention;

[0025] Figure 7 is a partially enlarged sectional view of the household combustible gas alarm according to an embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of the connection buckle according to an embodiment of the present invention;

[0027] Figure 9 is Figure 1 a sectional view of a household combustible gas alarm in

[0028] Figure 10 a schematic diagram of the sensor according to an embodiment of the present utility model;

[0029] Figure 11 a schematic diagram of the circuit assembly according to an embodiment of the present utility model.

[0030] The reference numerals are as follows:

[0031] 100, household combustible gas alarm;

[0032] 1, housing assembly; 11, accommodation cavity; 12, first end; 121, inspection hole; 13, first housing; 131, second clamping portion; 132, wiring hole; 133, wiring board; 134, connecting rib; 135, connecting buckle; 1351, first rib; 136, third ventilation hole; 14, second housing; 141, first clamping portion; 1411, guiding portion; 1412, abutting portion; 142, ventilation hole group; 1421, first ventilation hole; 143, second ventilation hole; 144, key hole; 145, second end; 146, third end; 147, power cord hole;

[0033] 2, circuit assembly; 21, circuit board; 22, sensor; 221, main body; 222, pin; 23, terminal;

[0034] 3, cover plate; 31, reset post;

[0035] 4, mounting bracket; 41, second rib; 42, mounting notch; 43, mounting hole;

[0036] A, the wall thickness direction of the first end; B, the inside-outside direction. Detailed implementation manners

[0037] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0038] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0039] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0040] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0041] The household combustible gas alarm 100 according to the embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0042] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in the figure, an embodiment of the utility model provides a household combustible gas alarm 100, which includes a housing assembly 1, a circuit assembly 2 and a cover plate 3. The housing assembly 1 is provided with a receiving cavity 11. An inspection hole 121 penetrating through the first end 12 along the wall thickness direction A of the first end is provided at the first end 12 of the housing assembly 1, and the inspection hole 121 is communicated with the receiving cavity 11. The circuit assembly 2 includes a circuit board 21 and a sensor 22. Both the circuit board 21 and the sensor 22 are located in the receiving cavity 11. The sensor 22 is detachably connected to the circuit board 21. The sensor 22 is located between the first end 12 and the circuit board 21, and the sensor 22 is disposed opposite to the inspection hole 121 in the wall thickness direction A of the first end. The cover plate 3 is detachably disposed on the inspection hole 121 to be able to close or open the inspection hole 121.

[0043] As Figure 3 shown, when it is necessary to disassemble the sensor 22, the cover plate 3 is disassembled to open the inspection hole 121 to expose the sensor 22, so that the sensor 22 can be disassembled through the inspection hole 121, thereby facilitating the cleaning and replacement of the sensor 22.

[0044] When it is necessary to install the sensor 22, the sensor 22 is installed on the circuit board 21 through the inspection hole 121, and the cover plate 3 is installed on the inspection hole 121 to complete the installation of the sensor 22.

[0045] For the household combustible gas alarm 100 of the embodiment of the utility model, through the reasonable layout of the positions of the sensor 22, the circuit board 21 and the inspection hole 121, the sensor 22 is exposed when the inspection hole 121 is opened, so that the sensor 22 can be disassembled through the inspection hole 121, thereby facilitating the cleaning and replacement of the sensor 22.

[0046] As Figure 4 、 Figure 10 and Figure 11 shown, in some embodiments, the sensor 22 includes a main body 221 and pins 222 connected to each other. The circuit board 21 is provided with insertion holes (not shown in the figure) adapted to the pins 222. The main body 221 is inserted into the insertion holes through the pins 222. The cover plate 3 is provided with a reset post 31, and the reset post 31 abuts against the main body 221.

[0047] The main body 221 can be inserted into the insertion holes through the pins 222. That is to say, the sensor 22 is detachably connected to the circuit board 21 in a plug-in manner, so that the installation and disassembly steps of the sensor 22 on the circuit board 21 can be simplified, and further the installation and disassembly of the sensor 22 can be facilitated.

[0048] When installing the sensor 22, align the pins 222 of the sensor 22 with the insertion holes of the circuit board 21 to position and preliminarily install the sensor 22. Make the reset posts 31 of the cover plate 3 abut against the main body 221, and drive the cover plate 3 to move so that the cover plate 3 covers the inspection hole, thereby enabling the reset posts 31 provided on the cover plate 3 to drive the main body 221 closer to the circuit board 21, and further enabling the pins 222 to be installed at reasonable positions within the insertion holes. Thus, through the reset posts 31, it is further easier to install the sensor 22, and the installation steps of the sensor 22 can be simplified.

[0049] In addition, the reset posts 31 abut against the main body 221, which can prevent the sensor 22 from displacing relative to the circuit board 21 due to unexpected situations during use. That is to say, the reset posts 31 abutting against the main body 221 can keep the sensor 22 in a reasonable position for normal operation, thereby avoiding faults caused by poor contact between the sensor 22 and the circuit board 21, and further improving the reliability of the household combustible gas alarm 100 of this embodiment.

[0050] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown in

[0051] By providing the mutually independent first housing 13 and second housing 14, the assembly steps of the housing assembly 1 are simplified, thereby improving the production speed.

[0052] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, in some embodiments, a functional area is provided at the third end 146 of the second housing 14, and a plurality of ventilation hole groups 142 are provided at intervals along the circumferential direction of the functional area. Each ventilation hole group 142 includes first ventilation holes 1421 provided at intervals along the inner and outer direction B. The first ventilation holes 1421 communicate with the accommodation cavity 11. A second ventilation hole 143 communicating with the accommodation cavity 11 is provided on the side wall of the second housing 14. A third ventilation hole 136 communicating with the accommodation cavity 11 is provided at the first end 12 of the first housing 13. The second housing 14 is provided with a keyhole 144. The inner wall of the keyhole 144 is arc-shaped. The keyhole 144 is located within the functional area. The third end 146 and the second end 145 are oppositely arranged in the wall thickness direction A of the first end.

[0053] It should be noted that "a plurality" means two or more.

[0054] By providing the first ventilation holes 1421, the second ventilation holes 143, and the third ventilation holes 136, the ventilation effect inside the accommodation cavity 11 is enhanced, so that the sensor 22 located inside the accommodation cavity 11 can detect the leakage of combustible gas more quickly.

[0055] The arc-shaped keyhole 144 is adapted to the shape of the finger, enabling the finger to more easily press the key located within the keyhole 144.

[0056] By arranging the keyhole 144 within the functional area and the plurality of ventilation hole groups 142 outside the functional area, the position of the keyhole 144 can be indicated to the user, thereby facilitating the user to find the key.

[0057] Furthermore, the second housing 14 is provided with an indicator light. The indicator light is located within the energy area, and the working state of the household combustible gas alarm 100 in this embodiment is reflected through the indicator light.

[0058] Such as Figure 6 As shown, furthermore, the second housing 14 is provided with a power cord hole 147 communicating with the accommodation cavity 11. The power cord is electrically connected to the circuit component 2 through the power cord hole 147.

[0059] Such as Figure 7 As shown, in some embodiments, one of the first housing 13 and the second housing 14 is provided with a first clamping portion 141, and the other of the first housing 13 and the second housing 14 is provided with a second clamping portion 131. The first clamping portion 141 and the second clamping portion 131 are clamped together.

[0060] The first housing 13 and the second housing 14 are installed by clamping, which facilitates the installation of the first housing 13 and the second housing 14, thereby simplifying the installation steps between the first housing 13 and the second housing 14 and improving the production efficiency.

[0061] Optionally, the first clamping portion 141 is a snap, and the second clamping portion 131 is a slot adapted to the snap, so as to facilitate the clamping between the first housing 13 and the second housing 14.

[0062] As Figure 7 shown, in some embodiments, the first clamping portion 141 includes a guiding portion 1411 and an abutting portion 1412 connected to each other. The second clamping portion 131 has a preset length, and the second clamping portion 131 forms a preset angle with the wall thickness direction A of the first end. The second clamping portion 131 is configured to be squeezed and offset when sliding along the guiding portion 1411 towards the abutting portion 1412, so as to be able to slide along the guiding portion 1411. The second clamping portion 131 is also configured to reset when disengaging from the guiding portion 1411, so as to be able to be clamped with the abutting portion 1412.

[0063] The second clamping portion 131 has a preset length, and the second clamping portion 131 forms a preset angle with the wall thickness direction A of the first end, so that the second clamping portion 131 can have a longer length, thereby enabling the second clamping portion 131 to meet the production and design requirements.

[0064] The guiding portion 1411 guides the second clamping portion 131, so that the second clamping portion 131 can accurately move to the position of the abutting portion 1412 and be clamped with the abutting portion 1412, so as to improve the movement stability of the second clamping portion 131 with a preset length.

[0065] In addition, the guiding portion 1411 can pre-press the second clamping portion 131. When the second clamping portion 131 disengages from the guiding portion 1411, the second clamping portion 131 will impact the first clamping portion 141 to generate a prompt sound, thereby prompting the user that the clamping is in place.

[0066] As Figure 9 and Figure 11 shown, in some embodiments, the circuit component 2 further includes a wiring terminal 23. The wiring terminal 23 is arranged on the circuit board 21. A wiring hole 132 penetrating the first end 12 along the wall thickness direction A of the first end is provided at the first end 12 of the first housing 13. The wiring terminal 23 is located between the first end 12 and the circuit board 21. The sensor 22 is arranged opposite to the wiring hole 132 in the wall thickness direction A of the first end. A wiring board 133 covering the wiring hole 132 is provided at the first end 12. The wiring board 133 is configured to separate from the first end 12 when subjected to a preset force.

[0067] Since the wiring terminal 23 is located between the first end 12 and the circuit board 21, and the sensor 22 is arranged opposite to the wiring hole 132 in the wall thickness direction A of the first end, when the wiring board 133 separates, the sensor 22 can be exposed, so that the wire harness can be connected to the wiring terminal 23 through the wiring hole 132.

[0068] When the terminal block 23 needs to be used, a preset force is applied to the wiring board 133 so that the wiring board 133 is in contact with the first end 12, thereby exposing the sensor 22, and then the terminal block 23 can be used.

[0069] Optionally, the wiring board 133 is adhesively bonded to the wiring hole 132 with glue of finite strength so that the wiring board 133 can be separated from the first end 12 when a preset force is applied.

[0070] As Figure 2 and Figure 3 shown, in some embodiments, the wiring board 133 is connected to the wiring hole 132 through a connecting rib 134, and the connecting rib 134 is configured to be damaged when a preset force is applied.

[0071] The separation of the wiring board 133 from the first end 12 when a preset force is applied is achieved by damaging the connecting rib 134.

[0072] The connection between the wiring board 133 and the first housing 13 is realized through the connecting rib 134, which can simplify the connection structure between the wiring board 133 and the first housing 13, thereby making the structure of the household combustible gas alarm 100 according to the embodiment of the present invention simple and compact.

[0073] In addition, the connection between the wiring board 133 and the first housing 13 is realized through the connecting rib 134, so that the connecting rib 134, the wiring board 133 and the first housing 13 can be integrally formed, thereby simplifying the manufacturing process, reducing the production difficulty and production cost, and further simplifying the connection structure between the wiring board 133 and the first housing 13, thus further making the structure of the household combustible gas alarm 100 according to the embodiment of the present invention simple and compact.

[0074] As Figure 1 and Figure 8 shown, in some embodiments, the first housing 13 or the second housing 14 is provided with a connection buckle 135. The household combustible gas alarm 100 further includes a mounting bracket 4. The mounting bracket 4 is provided with a mounting hole 43. The mounting bracket 4 is rotatably arranged on the second housing 14 between a mounting position and a separation position. The mounting bracket 4 located at the mounting position is connected to the connection buckle 135, and the mounting bracket 4 located at the separation position is separated from the connection buckle 135.

[0075] The mounting bracket 4 can be installed through the mounting hole 43. The household combustible gas alarm 100 of the present embodiment is installed by connecting the connection buckle 135 to the mounting bracket 4, and the household combustible gas alarm 100 of the present embodiment is disassembled by separating the connection buckle 135 from the mounting bracket 4, thereby facilitating the installation and disassembly of the household combustible gas alarm 100.

[0076] As Figure 1 andFigure 8 As shown, in some embodiments, the connecting buckle 135 is provided with a first rib 1351, and the mounting bracket 4 is provided with a plurality of second ribs 41. The second ribs 41 are arranged at intervals along the circumferential direction of the mounting bracket 4. When the mounting bracket 4 is in the mounting position, the first rib 1351 is located between two adjacent second ribs 41. The first rib 1351 and the second ribs 41 are used to generate resistance when moving relative to each other and coming into contact, so as to prevent the mounting bracket 4 and the connecting buckle 135 from rotating relative to each other.

[0077] The first rib 1351 and the second ribs 41 prevent the connecting buckle 135 and the mounting bracket 4 from rotating relative to each other due to the influence of the external environment, thereby preventing the connecting buckle 135 and the mounting bracket 4 from being abnormally disengaged.

[0078] When the connecting buckle 135 needs to be disengaged from the mounting bracket 4, rotate the connecting buckle 135 or the mounting bracket 4 so that the mounting bracket 4 and the connecting buckle 135 overcome the resistance and rotate, so that the mounting bracket 4 can rotate to the separation position and disengage from the connecting buckle 135.

[0079] Therefore, by providing the first rib 1351 and the second ribs 41, the connecting buckle 135 and the mounting bracket 4 can be prevented from being abnormally disengaged, and the connecting buckle 135 and the mounting bracket 4 can be disengaged from each other when disengagement is required.

[0080] As Figure 1 shown, in some embodiments, the mounting bracket 4 is provided with a mounting notch 42. When the mounting bracket 4 is in the separation position, the connecting buckle 135 is located in the mounting notch 42 so as to be able to separate from the mounting bracket 4.

[0081] The connection relationship between the connecting buckle 135 located in the mounting notch 42 and the mounting bracket 4 is released so as to be able to separate from each other. The mounting notch 42 can reduce the difficulty of separating the connecting buckle 135 from the mounting bracket 4, thereby improving the operation speed of the user.

[0082] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A household combustible gas alarm, characterized in that, Comprising: A housing assembly, the housing assembly is provided with a receiving cavity, a maintenance hole penetrating through the first end along the wall thickness direction of the first end is provided at the first end of the housing assembly, and the maintenance hole communicates with the receiving cavity; A circuit assembly, the circuit assembly includes a circuit board and a sensor, both the circuit board and the sensor are located in the receiving cavity, the sensor is detachably connected to the circuit board, the sensor is located between the first end and the circuit board, and the sensor is disposed opposite to the maintenance hole in the wall thickness direction; A cover plate, the cover plate is detachably disposed on the maintenance hole to be able to close or open the maintenance hole.

2. The household combustible gas alarm according to claim 1, characterized in that, The housing assembly includes a first housing and a second housing, the second housing defines the receiving cavity with an opening provided at the second end of the second housing, the first housing is disposed at the second end to cover the opening, and the first housing has the first end.

3. The household combustible gas alarm according to claim 2, characterized in that, A functional area and a plurality of ventilation hole groups are provided at intervals along the circumference of the functional area at the third end of the second housing. Each ventilation hole group includes a first ventilation hole spaced apart in the inner and outer directions, the first ventilation hole communicates with the receiving cavity, a second ventilation hole communicating with the receiving cavity is provided on the side wall of the second housing, a third ventilation hole communicating with the receiving cavity is provided at the first end of the first housing, a key hole is provided on the second housing, the inner wall of the key hole is arc-shaped, the key hole is located in the functional area, and the third end and the second end are disposed opposite to each other in the wall thickness direction.

4. The household combustible gas alarm according to claim 2, characterized in that, One of the first housing and the second housing is provided with a first engaging portion, and the other of the first housing and the second housing is provided with a second engaging portion, and the first engaging portion and the second engaging portion are engaged.

5. The household combustible gas alarm according to claim 4, wherein The first engaging portion includes a guiding portion and an abutting portion connected to each other. The second engaging portion has a preset length, the second engaging portion forms a preset angle with the wall thickness direction, and the second engaging portion is configured to be displaced under extrusion when sliding along the guiding portion towards the abutting portion so as to be able to slide along the guiding portion. The second engaging portion is further configured to reset when disengaging from the guiding portion so as to be able to engage with the abutting portion.

6. The household combustible gas alarm according to any one of claims 2 to 5, characterized in that, The circuit assembly further includes a wiring terminal, the wiring terminal is disposed on the circuit board, a wiring hole penetrating through the first end along the wall thickness direction is provided at the first end of the first housing, the wiring terminal is located between the first end and the circuit board, the sensor is disposed opposite to the wiring hole in the wall thickness direction, and a wiring board covering the wiring hole is provided at the first end. The wiring board is configured to be separated from the first end when subjected to a preset force.

7. The household combustible gas alarm according to claim 6, wherein The wiring board is connected to the wiring hole through a connecting rib, and the connecting rib is configured to be damaged when subjected to the preset force.

8. The household combustible gas alarm according to any one of claims 2 to 5, characterized in that, The first housing or the second housing is provided with a connecting buckle. The household combustible gas alarm further includes a mounting bracket which is provided with a mounting hole. The mounting bracket is rotatably arranged on the second housing between a mounting position and a separating position. The mounting bracket at the mounting position is connected to the connecting buckle, and the mounting bracket at the separating position is separated from the connecting buckle.

9. The household combustible gas alarm according to claim 8, wherein, The connecting buckle is provided with a first rib, and the mounting bracket is provided with a plurality of second ribs which are arranged at intervals along the circumferential direction of the mounting bracket. When the mounting bracket is at the mounting position, the first rib is located between two adjacent second ribs. The first rib and the second ribs are used to generate resistance when moving relatively and contacting each other to prevent the relative rotation of the mounting bracket and the connecting buckle; and / or, The mounting bracket is provided with a mounting notch. When the mounting bracket is at the separating position, the connecting buckle is located in the mounting notch so as to be separable from the mounting bracket.

10. The household combustible gas alarm according to any one of claims 1 to 5, characterized in that, The sensor includes a main body and a pin which are connected to each other. The circuit board is provided with a socket hole adapted to the pin. The main body is inserted into the socket hole through the pin. The cover plate is provided with a reset post which abuts against the main body.

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