Combustible gas alarm probe

Abstract

The utility model relates to measuring instrument technical field especially, and it is a kind of combustible gas alarm probe.The utility model discloses shell assembly, gas sensor built-in shell assembly, mounting assembly and circuit board assembly;Shell assembly includes coaxial screwing first shell and second shell;Mounting assembly is installed on the inner wall of second shell, to support gas sensor;Circuit board assembly is installed on the bottom of mounting assembly;The bottom of gas sensor is equipped with multiple pins, and multiple contact ends are equipped on circuit board assembly, multiple pins are detachably worn in mounting assembly, and contact with multiple contact ends one-to-one correspondingly.The utility model discloses gas sensor adopts plug-in structure, so that the replacement of gas sensor is more convenient, significantly simplifies the replacement process of gas sensor, reduces maintenance cost, enhances the practicability and portability of combustible gas alarm probe.

Description

Technical Field

[0001] This utility model relates to the field of measuring instrument technology, and in particular to a combustible gas alarm probe. Background Technology

[0002] A combustible gas detector probe is a device used to detect the concentration of combustible gases in the environment. It is widely used in industrial production sites, home kitchens, and other environments where combustible gas leaks may occur. When the detected combustible gas concentration reaches a preset alarm threshold, the detector probe will trigger an alarm signal to remind relevant personnel to take necessary safety measures in a timely manner to prevent safety accidents such as fires or explosions.

[0003] Existing combustible gas detector probes typically consist of a housing and a gas sensor housed within it. The gas sensor detects the concentration of combustible gas in the environment. When the detected concentration exceeds a set threshold, the alarm emits an audible and visual alarm or other forms of warning signal.

[0004] However, existing technologies have the following problems: gas sensors are generally fixed to a circuit board by soldering, and then further secured inside the alarm housing. Since gas sensors have a limited lifespan (typically 1-2 years), they are prone to performance degradation or even failure during use, requiring periodic replacement. However, because the sensor is fixed inside the housing and connected to the circuit board by solder, the replacement process is complex and difficult for users to perform themselves. It must be done by skilled professionals using specialized tools, increasing maintenance costs and reducing the maintainability and user experience of the equipment.

[0005] Therefore, there is an urgent need to provide a combustible gas alarm probe that facilitates the replacement of gas sensors, thereby improving the replacement efficiency of gas sensors and enhancing the practicality and portability of combustible gas alarm probes. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a combustible gas alarm probe, which solves the technical problem of cumbersome and complicated replacement of gas sensors and reduced replacement efficiency in existing combustible gas alarm probes.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0010] This utility model provides a combustible gas alarm probe, including a housing assembly, a gas sensor built into the housing assembly, a mounting assembly, and a circuit board assembly. The housing assembly includes a first housing and a second housing coaxially screwed together. The mounting assembly is mounted on the inner wall of the second housing to support the gas sensor. The circuit board assembly is mounted on the bottom of the mounting assembly. The bottom of the gas sensor is provided with multiple pins, and the circuit board assembly is provided with multiple contact terminals. The multiple pins are detachably inserted through the mounting assembly and make contact with the multiple contact terminals one by one, so that the gas sensor is electrically connected to the circuit board assembly to detect the concentration of combustible gas.

[0011] Preferably, the mounting assembly includes a fixing sleeve and a fixing bracket; the fixing sleeve and the fixing bracket are coaxially arranged, the fixing sleeve is detachably fitted onto the outer wall of the fixing bracket, and the fixing sleeve is screwed onto the inner wall of the second housing; the fixing bracket has multiple insertion holes so that multiple pins are inserted into the multiple insertion holes one by one and make contact with the multiple contact ends one by one, and the circuit board assembly is detachably mounted on the bottom of the fixing bracket.

[0012] Preferably, the top of the fixed bracket is provided with a receiving groove, and the bottom of the gas sensor is placed in the receiving groove to position the gas sensor; all of the plurality of the sockets are in communication with the receiving groove.

[0013] Preferably, the circuit board assembly includes a circuit board body and a plurality of first copper sleeves; the top of the circuit board body is provided with a plurality of conductive contacts; the first copper sleeves are the contact ends, and the plurality of first copper sleeves are fixedly inserted into the circuit board body in a one-to-one correspondence, and the plurality of first copper sleeves are connected to the plurality of conductive contacts in a one-to-one correspondence; the plurality of first copper sleeves are used to insert into the plurality of pins, so that the current of the gas sensor is transmitted to the circuit board body through the plurality of pins and the plurality of first copper sleeves; the circuit board body is detachably mounted to the bottom of the fixing bracket by screws.

[0014] Preferably, the circuit board assembly includes a circuit board body and a plurality of conductive magnets, wherein the conductive magnets are the contact ends; the bottom of the fixing bracket is provided with a plurality of magnet slots, and the plurality of magnet slots are connected to the plurality of sockets one by one; the top of the circuit board body is provided with a plurality of conductive contacts, the bottoms of the plurality of conductive magnets are fixedly connected to the plurality of conductive contacts one by one, and the plurality of conductive magnets are inserted into the plurality of magnet slots one by one; the conductive magnets are magnetically connected to the pins passing through the sockets, so that the current of the gas sensor is transmitted to the circuit board body through the plurality of pins and the plurality of conductive magnets.

[0015] Preferably, a second copper sleeve is inserted into each of the sockets, and the bottom of the second copper sleeve is a closed structure; the pin is detachably inserted into the second copper sleeve, the inner wall of the second copper sleeve is tightly fitted with the outer wall of the pin, and the bottom wall of the pin is fitted with the inner bottom wall of the second copper sleeve. The bottom of the pin can be magnetically connected to the conductive magnet through the bottom of the second copper sleeve, and the bottom of the second copper sleeve abuts against the top of the conductive magnet.

[0016] Preferably, the inner wall of the second housing is provided with a protrusion, and the bottom outer edge of the fixing bracket or the circuit board body is engaged with the protrusion to position and limit the installation position of the fixing bracket or the circuit board body.

[0017] Preferably, a limiting groove is formed on the inner top wall of the first housing, and the top of the gas sensor is embedded in the limiting groove to limit the position of the gas sensor.

[0018] Preferably, it further includes a protective sleeve; the protective sleeve is fitted onto the outer wall of the housing assembly to protect the housing assembly and the gas sensor, the mounting assembly and the circuit board assembly inside it.

[0019] Preferably, the protective sleeve is made of soft rubber.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of this utility model are:

[0022] This invention improves the efficiency of disassembly and assembly by using a coaxially screwed first and second outer shell. This allows users to easily and conveniently remove the first and second outer shells to expose the internal gas sensor, mounting assembly, and circuit board assembly for replacement. By detachably inserting multiple pins at the bottom of the gas sensor into the mounting assembly and making contact with multiple contact points on the circuit board assembly, a stable electrical connection between the gas sensor and the circuit board assembly is achieved, further improving the efficiency of gas sensor disassembly and assembly. Compared to traditional soldering of gas sensors to circuit board assemblies, the plug-in structure of the gas sensor in this invention makes replacement much more convenient, significantly simplifying the gas sensor replacement process. Users can quickly and manually disassemble and assemble the sensor simply by unscrewing the outer shell assembly, without the need for professional tools or skills. This greatly improves the efficiency of gas sensor replacement and the maintainability of the equipment, reduces maintenance costs, and enhances the practicality and portability of the combustible gas alarm probe. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall three-dimensional structure of a combustible gas alarm probe according to the present invention;

[0024] Figure 2 for Figure 1 A cross-sectional structural diagram of AA in Example 1;

[0025] Figure 3 for Figure 1 A cross-sectional structural diagram of BB's first embodiment;

[0026] Figure 4 This is a schematic diagram of the overall three-dimensional disassembly structure of a combustible gas alarm probe according to a first embodiment of the present invention;

[0027] Figure 5 for Figure 1 A cross-sectional structural diagram of Example 2 of BB;

[0028] Figure 6 This is a schematic diagram of the overall three-dimensional disassembly structure of a second embodiment of the combustible gas alarm probe of this utility model;

[0029] Figure 7 This is a bottom-view three-dimensional structural diagram of the fixed bracket in Embodiment 2 of the combustible gas alarm probe of this utility model.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1: Housing assembly; 11: First housing; 111: Limiting groove; 12: Second housing; 121: Protrusion; 2: Gas sensor; 21: Pin; 3: Mounting assembly; 31: Fixing sleeve; 32: Fixing bracket; 321: Insertion hole; 322: Receiving groove; 323: Magnet receiving groove; 324: Second copper sleeve; 4: Circuit board assembly; 41: Circuit board body; 411: Conductive contact; 42: First copper sleeve; 43: Screw; 44: Conductive magnet; 5: Protective sleeve. Detailed Implementation

[0032] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0033] Example 1

[0034] like Figures 1-4As shown, a combustible gas alarm probe of this embodiment includes a housing assembly 1, a gas sensor 2 built into the housing assembly 1, a mounting assembly 3, and a circuit board assembly 4.

[0035] Specifically, such as Figures 2-4 As shown, the housing assembly 1 includes a first housing 11 and a second housing 12 coaxially screwed together. This improves the efficiency of disassembly and assembly of the housing assembly 1, allowing users to easily and conveniently remove the first housing 11 and the second housing 12 to expose the internal gas sensor 2, mounting assembly 3, and circuit board assembly 4, thereby enabling replacement of the gas sensor 2, mounting assembly 3, or circuit board assembly 4. The mounting assembly 3 is mounted on the inner wall of the second housing 12 to support the gas sensor 2, and the circuit board assembly 4 is mounted on the bottom of the mounting assembly 3. The bottom of the gas sensor 2 is provided with multiple pins 21, and the circuit board assembly 4 is provided with multiple contact terminals. The multiple pins 21 are detachably inserted into the mounting assembly 3 and make contact with the multiple contact terminals one by one, so that the gas sensor 2 is electrically connected to the circuit board assembly 4 to detect the concentration of combustible gas.

[0036] By detachably inserting multiple pins 21 at the bottom of the gas sensor 2 into the mounting assembly 3 and having them contact multiple contact ends on the circuit board assembly 4, a stable electrical connection between the gas sensor 2 and the circuit board assembly 4 can be achieved. Furthermore, the assembly and disassembly efficiency of the gas sensor 2 can be improved. Compared to the traditional soldering of the gas sensor 2 to the circuit board assembly 4, the gas sensor 2 in this invention adopts a plug-in structure, making the replacement of the gas sensor 2 more convenient and significantly simplifying the replacement process. Users only need to unscrew the outer casing assembly 1 to quickly disassemble and install the sensor by hand, without the need for professional tools or skills. This greatly improves the replacement efficiency of the gas sensor 2, reduces maintenance costs, and enhances the practicality and portability of the combustible gas alarm probe.

[0037] Furthermore, such as Figures 2-4As shown, the mounting assembly 3 includes a fixing sleeve 31 and a fixing bracket 32. The fixing sleeve 31 and the fixing bracket 32 ​​are coaxially arranged. The fixing sleeve 31 is detachably fitted onto the outer wall of the fixing bracket 32, allowing for quick disassembly of the fixing bracket 32 ​​from the fixing sleeve 31. The fixing sleeve 31 is screwed onto the inner wall of the second housing 12, so that if either the fixing bracket 32 ​​or the fixing sleeve 31 is damaged, the mounting assembly 3 can be replaced simply by removing the fixing sleeve 31 from the inner wall of the second housing 12 and replacing the fixing bracket 32 ​​or the fixing sleeve 31, greatly improving the replacement efficiency of the mounting assembly 3. The fixing bracket 32 ​​has multiple insertion holes 321, allowing multiple pins 21 to be inserted one-to-one into the multiple insertion holes 321 and make one-to-one contact with multiple contact ends, achieving a plug-in structure between the gas sensor 2 and the fixing bracket 32. This allows for quick replacement of the gas sensor 2 without the need for specialized tools or equipment, improving disassembly and replacement efficiency. A circuit board assembly 4 is detachably mounted at the bottom of the fixing bracket 32.

[0038] Among them, such as Figure 2 and Figure 3 As shown, when screwing the fixing sleeve 31 onto the inner wall of the second housing 12, it can be installed by hand or by using other tools. Generally, it is installed by hand because the top of the fixing sleeve 31 protrudes from the top of the second housing 12, allowing the fixing sleeve 31 to be installed by hand.

[0039] Furthermore, such as Figures 2-4 As shown, the top of the fixed bracket 32 ​​is provided with a receiving groove 322, and the bottom of the gas sensor 2 is placed in the receiving groove 322 to position the gas sensor 2, ensuring its accurate position during installation, avoiding offset or tilting, and improving assembly accuracy and overall structural stability. Multiple insertion holes 321 are connected to the receiving groove 322 to ensure that the pin 21 can be inserted into the insertion hole 321.

[0040] Furthermore, the circuit board assembly 4 includes a circuit board body 41 and multiple first copper sleeves 42. The top of the circuit board body 41 is provided with multiple conductive contacts 411. The first copper sleeves 42 are contact ends, and multiple first copper sleeves 42 are fixedly inserted into the circuit board body 41 in a one-to-one correspondence, and are connected to the multiple conductive contacts 411 in a one-to-one correspondence. The outer wall of the first copper sleeve 42 is connected to the conductive contacts 411 by soldering. The multiple first copper sleeves 42 are used to insert into multiple pins 21, and the outer wall of the pins 21 is tightly fitted with the inner wall of the first copper sleeve 42, forming a good conductive contact surface. This effectively avoids conductive interruptions caused by aging or poor contact of traditional solder joints, allowing the current of the gas sensor 2 to be transmitted to the circuit board body 41 through the multiple pins 21 and the multiple first copper sleeves 42, improving the accuracy of the detection data and the stability of the combustible gas alarm probe. Furthermore, the gas sensor 2 can be electrically connected simply by inserting the pin 21 directly into the first copper sleeve 42, eliminating the need for soldering. This allows users to quickly install and remove the gas sensor 2, greatly simplifying the installation and replacement efficiency and improving the maintainability and ease of use of the combustible gas alarm probe. The circuit board 41 is detachably mounted to the bottom of the mounting bracket 32 ​​using screws 43, facilitating replacement in case of circuit board failure.

[0041] Furthermore, such as Figure 2 and Figure 3 As shown, a protrusion 121 is provided on the inner wall of the second outer casing 12. The bottom outer edge of the fixing bracket 32 ​​is engaged with the protrusion 121 to position and limit the installation position of the fixing bracket 32, ensuring the accurate installation position of the fixing bracket 32 ​​and avoiding structural instability caused by offset or tilting during assembly. Moreover, the protrusion 121 can also effectively support the fixing bracket 32, preventing the internal structure from tilting or shaking due to vibration affecting the combustible gas alarm probe.

[0042] Furthermore, such as Figure 2 and Figure 3 As shown, a limiting groove 111 is formed on the inner top wall of the first housing 11. The top of the gas sensor 2 is embedded in the limiting groove 111 to limit the gas sensor 2, preventing it from shifting or shaking during use, thus improving the consistency and structural stability of the combustible gas alarm probe assembly. Moreover, the limiting groove 111, together with the receiving groove 322, can also limit the gas sensor 2, preventing it from tilting or shaking under vibration or shaking, thereby improving the installation stability of the gas sensor 2.

[0043] Furthermore, such as Figures 1-4As shown, a combustible gas alarm probe in this embodiment also includes a protective sleeve 5. The protective sleeve 5 is fitted onto the outer wall of the housing assembly 1 to protect the housing assembly 1 and its internal components, including the gas sensor 2, mounting assembly 3, and circuit board assembly 4. This effectively prevents dust, moisture, and other foreign matter from entering the combustible gas alarm probe, avoiding any impact on the gas sensor 2 and circuit board 41. This significantly improves the stability and reliability of the combustible gas alarm probe in complex environments. Furthermore, it reduces mechanical damage and electrical connection failures caused by external impacts, friction, or corrosion, thereby extending the service life of the combustible gas alarm probe.

[0044] Furthermore, the protective cover 5 is made of soft rubber, which has good elasticity and toughness. It can cushion the combustible gas alarm probe when it is subjected to slight impact or drop, effectively preventing damage to the outer shell assembly 1 and internal components, and significantly improving the durability and safety of the combustible gas alarm probe.

[0045] Example 2

[0046] Unlike Example 1, as Figures 5-7 As shown, the circuit board assembly 4 in this embodiment includes a circuit board body 41 and a plurality of conductive magnets 44, and the conductive magnets 44 are contact terminals. Figure 7As shown, the bottom of the fixing bracket 32 ​​is provided with multiple magnet slots 323, which are connected to multiple sockets 321 one by one. The top of the circuit board body 41 is provided with multiple conductive contacts 411, and the bottoms of multiple conductive magnets 44 are fixedly connected to the multiple conductive contacts 411 one by one. The conductive magnets 44 are fixedly connected to the conductive contacts 411 by soldering. The multiple conductive magnets 44 are inserted into the multiple magnet slots 323 one by one. That is, the circuit board body 41 is detachably connected to the fixing bracket 32 ​​by inserting multiple conductive magnets 44 into the multiple magnet slots 323 one by one. This allows the circuit board body 41 to be replaced directly by plugging and unplugging when it is damaged, improving the disassembly and replacement efficiency of the circuit board body 41. The conductive magnet 44 is magnetically connected to the pins 21 passing through the socket 321. This allows the current from the gas sensor 2 to be transmitted to the circuit board 41 through multiple pins 21 and multiple conductive magnets 44 without affecting the electrical connection between the gas sensor 2 and the conductive magnet 44. It also makes the replacement of the gas sensor 2 more convenient; to remove the gas sensor 2, simply pull it out, detaching the pins 21 from the conductive magnet 44. To install the gas sensor 2, simply insert the pins 21 into the socket 321, and the conductive magnet 44 will attract the pins 21, allowing the pins 21 to be magnetically connected to the conductive magnet 44. This ensures the continuity of the gas sensor 2's conductivity, further improving the efficiency of disassembly, replacement, and use of the gas sensor 2.

[0047] Furthermore, such as Figure 5 and Figure 6 As shown, a second copper sleeve 324 is inserted into each socket 321, and the bottom of the second copper sleeve 324 is a closed structure. The pin 21 is detachably inserted into the second copper sleeve 324. The inner wall of the second copper sleeve 324 is in close contact with the outer wall of the pin 21, and the bottom wall of the pin 21 is in close contact with the inner bottom wall of the second copper sleeve 324. The bottom of the pin 21 can be magnetically connected to the conductive magnet 44 through the bottom of the second copper sleeve 324, and the bottom of the second copper sleeve 324 abuts against the top of the conductive magnet 44. The second copper sleeve 324 can increase the contact area between the pin 21 and the conductive magnet 44 without affecting the magnetic connection between the pin 21 and the conductive magnet 44, thereby improving the conductivity between the pin 21 and the conductive magnet 44. Moreover, since the outer wall and bottom wall of the pin 21 are respectively attached to the inner wall and the inner bottom wall of the second copper sleeve 324, it can ensure that the current of the gas sensor 2 can be transmitted to the circuit board body 41 through the attachment of the pin 21 and the second copper sleeve 324, thus ensuring the stable transmission of current.

[0048] It should be noted that the bottom of the pin 21 is made of a material that can be magnetically attracted by the conductive magnet 44 and has conductive properties, such as iron or nickel, so that it can be magnetically connected to the conductive magnet 44 and has conductive properties. Moreover, the magnetic force of the conductive magnet 44 is strong enough, and the bottom thickness of the second copper sleeve 324 is small, so that the bottom of the pin 21 can be magnetically connected to the conductive magnet 44 through the bottom wall of the second copper sleeve 324.

[0049] Furthermore, such as Figure 5 and Figure 6 As shown, a protrusion 121 is provided on the inner wall of the second housing 12. The bottom outer edge of the circuit board body 41 is engaged with the protrusion 121 to position and limit the installation position of the circuit board body 41, ensuring the accurate installation position of the circuit board body 41 and avoiding structural instability caused by offset or tilting during assembly. Moreover, the protrusion 121 can also effectively support the circuit board body 41, preventing the internal structure from tilting or shaking due to vibration affecting the combustible gas alarm probe.

[0050] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0052] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A combustible gas alarm probe, characterized in that, It includes a housing assembly (1), a gas sensor (2) built into the housing assembly (1), a mounting assembly (3), and a circuit board assembly (4); The housing assembly (1) includes a first housing (11) and a second housing (12) that are coaxially screwed together; The mounting assembly (3) is mounted on the inner wall of the second housing (12) to support the gas sensor (2); The circuit board assembly (4) is mounted on the bottom of the mounting assembly (3); The gas sensor (2) has multiple pins (21) at its bottom and multiple contact terminals on the circuit board assembly (4). The multiple pins (21) are detachably inserted into the mounting assembly (3) and make contact with the multiple contact terminals one by one, so that the gas sensor (2) is electrically connected to the circuit board assembly (4) to detect the concentration of combustible gas.

2. The combustible gas alarm probe as described in claim 1, characterized in that: The mounting assembly (3) includes a fixing sleeve (31) and a fixing bracket (32); The fixing sleeve (31) and the fixing bracket (32) are coaxially arranged. The fixing sleeve (31) is detachably sleeved on the outer wall of the fixing bracket (32). The fixing sleeve (31) is screwed to the inner wall of the second outer shell (12). The fixed bracket (32) has multiple sockets (321) so that multiple pins (21) can be inserted into the multiple sockets (321) and contact the multiple contact ends in a corresponding manner. The circuit board assembly (4) can be detachably installed at the bottom of the fixed bracket (32).

3. The combustible gas alarm probe as described in claim 2, characterized in that: The top of the fixed bracket (32) is provided with a receiving groove (322), and the bottom of the gas sensor (2) is placed in the receiving groove (322) to position the installation position of the gas sensor (2). All of the aforementioned insertion holes (321) are connected to the receiving groove (322).

4. The combustible gas alarm probe as described in claim 3, characterized in that: The circuit board assembly (4) includes a circuit board body (41) and a plurality of first copper sleeves (42); The top of the circuit board body (41) is provided with multiple conductive contacts (411); The first copper sleeve (42) is the contact end, and multiple first copper sleeves (42) are fixedly inserted into the circuit board body (41) in a one-to-one correspondence, and multiple first copper sleeves (42) are connected to multiple conductive contacts (411) in a one-to-one correspondence. Multiple first copper sleeves (42) are used to insert with multiple pins (21) so that the current of the gas sensor (2) is transmitted to the circuit board body (41) through the multiple pins (21) and the multiple first copper sleeves (42); The circuit board body (41) is detachably mounted to the bottom of the fixing bracket (32) by screws (43).

5. The combustible gas alarm probe as described in claim 3, characterized in that: The circuit board assembly (4) includes a circuit board body (41) and a plurality of conductive magnets (44), wherein the conductive magnets (44) are the contact ends; The bottom of the fixed bracket (32) is provided with a plurality of magnet slots (323), and the plurality of magnet slots (323) are connected to the plurality of sockets (321) in a one-to-one correspondence; The top of the circuit board body (41) is provided with multiple conductive contacts (411), the bottoms of multiple conductive magnets (44) are fixedly connected to the multiple conductive contacts (411) one by one, and the multiple conductive magnets (44) are inserted into the multiple magnet slots (323) one by one. The conductive magnet (44) is magnetically connected to the pin (21) passing through the socket (321) so that the current of the gas sensor (2) is transmitted to the circuit board body (41) through the plurality of pins (21) and the plurality of conductive magnets (44).

6. The combustible gas alarm probe as described in claim 5, characterized in that: Each of the aforementioned sockets (321) is fitted with a second copper sleeve (324), and the bottom of the second copper sleeve (324) is a closed structure; The pin (21) is detachably inserted into the second copper sleeve (324). The inner wall of the second copper sleeve (324) is in close contact with the outer wall of the pin (21), and the bottom wall of the pin (21) is in contact with the inner bottom wall of the second copper sleeve (324). The bottom of the pin (21) can be magnetically connected to the conductive magnet (44) through the bottom of the second copper sleeve (324), and the bottom of the second copper sleeve (324) abuts against the top of the conductive magnet (44).

7. The combustible gas alarm probe as described in claim 4 or 5, characterized in that: The inner wall of the second outer shell (12) is provided with a protrusion (121), and the bottom outer edge of the fixing bracket (32) or the circuit board body (41) is engaged on the protrusion (121) to position and limit the installation position of the fixing bracket (32) or the circuit board body (41).

8. The combustible gas alarm probe as described in claim 1, characterized in that: A limiting groove (111) is provided on the inner top wall of the first housing (11), and the top of the gas sensor (2) is embedded in the limiting groove (111) to limit the gas sensor (2).

9. The combustible gas alarm probe as described in claim 1, characterized in that: It also includes a protective case (5); The protective sleeve (5) is fitted onto the outer wall of the housing assembly (1) to protect the housing assembly (1) and the gas sensor (2), the mounting assembly (3) and the circuit board assembly (4) inside it.

10. The combustible gas alarm probe as described in claim 9, characterized in that: The protective sleeve (5) is made of soft rubber.

Images