Combustible gas sensor module

Abstract

The utility model provides a kind of combustible gas sensor module, comprising: bare combustible gas sensor, upper shell, lower shell, gas joint, connector and PCB board;Lower shell is detachably connected between upper shell, and gas joint is detachably installed on upper shell;Bare combustible gas sensor and PCB board are electrically connected, and assembled into combination;Combination is detachably installed on lower shell, and located in upper shell interior;Buffer cavity is provided in upper shell, and gas joint is communicated with buffer cavity;Buffer cavity can pass in and out measured gas by gas joint, and bare combustible gas sensor can detect measured gas in buffer cavity;Connector is installed on lower shell, and PCB board is electrically connected with connector, and PCB board is connected with external part by connector.The utility model provides a kind of combustible gas sensor module, simple structure, small and exquisite, easy to disassemble and assemble.

Description

Technical Field

[0001] This utility model relates to the field of gas sensor technology, specifically to a combustible gas sensor module. Background Technology

[0002] In the industrial production sector, combustible gas leakage is a safety hazard that cannot be ignored. Gas sensors are commonly used in related technologies to detect combustible gas leaks.

[0003] Gas sensors come in a wide variety of types, but most commercially available sensors are bare sensors, consisting only of the housing, internal structure, pins, and surface diaphragm. The sensor's surface diaphragm, which transmits the gas being measured, is typically exposed to the environment, making it unsuitable for direct application in closed, pump-driven pipelines and hindering quantitative detection. Furthermore, bare sensors usually detect raw electrical signals, requiring users to design their own circuitry to convert the raw signal into the target signal, increasing the complexity of use. While various sensor application methods have emerged with industry advancements, none have offered flexible and convenient installation and replacement options.

[0004] Therefore, there is an urgent need for a combustible gas sensor module that includes a closed gas path structure that can be connected to a pump-suction pipeline, a data processing system that can directly acquire target signals, and is easy to disassemble and maintain.

[0005] Patent document CN115248284 discloses a combustible gas sensor module and a combustible gas sensing device. The combustible gas sensor module includes: a housing with a first end and a second end opposite to each other; a connector located at the first end of the housing for connection to the sensing device body of the combustible gas sensing device; a sensor unit located at the second end of the housing for sensing combustible gas; and a circuit board located in the housing and connected to the connector and the sensor respectively, wherein a microcontroller is disposed on the circuit board. However, this patent document still has the drawback of not being flexible and convenient enough in terms of installation and replacement. Utility Model Content

[0006] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a combustible gas sensor module.

[0007] According to the present invention, a combustible gas sensor module includes: a bare combustible gas sensor, an upper shell, a lower shell, a gas connector, a plug, and a PCB board.

[0008] The lower outer shell and the upper outer shell are detachably connected, and the gas connector is detachably installed on the upper outer shell;

[0009] The bare combustible gas sensor and the PCB board are electrically connected and assembled into a unit; the unit is detachably mounted on the lower housing and located inside the upper housing.

[0010] A buffer cavity is provided inside the upper outer shell, and the gas connector is connected to the buffer cavity; the gas to be tested can enter and exit the buffer cavity through the gas connector, and the bare combustible gas sensor can detect the gas to be tested in the buffer cavity;

[0011] The connector is mounted on the lower housing, the PCB board is electrically connected to the connector, and the PCB board is connected to external components through the connector.

[0012] Preferably, the gas connector includes: an inlet connector and an outlet connector;

[0013] The air inlet connector and the air outlet connector are connected to the buffer cavity;

[0014] The gas to be tested enters the buffer chamber through the inlet connector and exits the buffer chamber through the outlet connector.

[0015] Preferably, the upper outer shell is provided with an air inlet and an air outlet communicating with the buffer cavity;

[0016] The air inlet connector is provided with an air inlet channel, and the air outlet connector is provided with an air outlet channel.

[0017] The air inlet is connected to the air inlet channel, and the air outlet is connected to the air outlet channel;

[0018] The gas to be tested is arranged in the following order: the inlet channel, the inlet orifice, the buffer cavity, the outlet orifice, and the outlet channel, forming the detection gas path for the gas to be tested.

[0019] Preferably, the PCB board includes: an upper PCB board and a lower PCB board;

[0020] The bare combustible gas sensor, the upper PCB board, and the lower PCB board are electrically connected sequentially from top to bottom and assembled into the assembly with a fixed structure; the assembly is secured to the lower outer shell.

[0021] The lower PCB board is electrically connected to the connector, and the lower PCB board is connected to external components through the connector.

[0022] Preferably, the air intake connector is threadedly connected to the upper housing via a first thread;

[0023] The vent connector is threadedly connected to the upper outer shell via a second thread.

[0024] Preferably, the lower outer shell and the upper outer shell are connected by a third thread.

[0025] Preferably, a sealing ring is provided between the bare combustible gas sensor and the upper housing;

[0026] The bare combustible gas sensor is sealed to the buffer cavity via the sealing ring.

[0027] Preferably, the bare combustible gas sensor is provided with a waterproof and breathable membrane;

[0028] The gas to be tested passes through the waterproof and breathable membrane and enters the gas detection concave surface on the bare combustible gas sensor.

[0029] Preferably, the air inlet connector and the air outlet connector are pagoda-shaped structural components that can be connected to a pump-suction pipeline.

[0030] Preferably, the upper PCB board and the lower PCB board constitute a circuit structure;

[0031] The circuit structure includes: an LDO module, a first RC filter circuit, an MCU module, and a second RC filter circuit;

[0032] The MCU module includes: a first operational amplifier and a second operational amplifier;

[0033] The LDO module is connected to the bare combustible gas sensor, and the LDO module is used to connect to a power source.

[0034] The first connection terminal of the first RC filter circuit is connected to the output terminal of the bare combustible gas sensor.

[0035] The second connection terminal of the first RC filter circuit is connected to the first power supply terminal of the first operational amplifier.

[0036] The output terminal of the first operational amplifier is connected to the first connection terminal of the second RC filter circuit;

[0037] The second connection terminal of the second RC filter circuit is connected to the first power supply terminal of the second operational amplifier;

[0038] The output of the second operational amplifier is connected to the connector.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The housing of this utility model consists of a detachable upper shell and a lower shell, and the air inlet and outlet connectors are detachably connected to the upper shell, which facilitates the overall disassembly and assembly of the sensor. When it is necessary to maintain the bare combustible gas sensor, the lower shell can be removed manually or with tools, and the bare combustible gas sensor can be taken out, thus facilitating the overall maintenance of the sensor.

[0041] 2. The upper shell of this utility model is provided with a buffer cavity. The buffer cavity is a relatively large space, which can slow down the flow rate of the gas to be measured, thereby achieving more accurate measurement. At the same time, this utility model is also provided with a waterproof and breathable membrane. The gas to be measured passes through the waterproof and breathable membrane and enters the gas detection concave surface on the upper side of the bare combustible gas sensor, thereby achieving more accurate measurement.

[0042] 3. The air inlet and outlet connectors of this utility model are both pagoda-shaped structural components, which can be directly connected to the pump suction pipeline, thus facilitating installation and connection during testing.

[0043] 4. This utility model is equipped with a sealing ring. When the upper and lower outer shells are tightened by the third thread, the bare combustible gas sensor presses the sealing ring onto the upper outer shell, thereby achieving a seal between the sensor and the outer shell and thus enabling more accurate measurement. Attached Figure Description

[0044] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0045] Figure 1 This is an isometric view of the combustible gas sensor module of this utility model;

[0046] Figure 2 This is a cross-sectional view of the combustible gas sensor module of this utility model;

[0047] Figure 3 This is a schematic diagram of the data processing system of the combustible gas sensor module of this utility model.

[0048] The diagram shows:

[0049] 1. Bare combustible gas sensor; 101. Gas detection concave surface; 102. Pin; 2. Upper housing; 201. Buffer cavity; 2021. Air inlet hole; 2022. Air outlet hole; 203. Fixing threaded hole; 3. Lower housing; 301. Locking cut surface; 4. Gas connector; 401. Air inlet connector; 4011. Air inlet channel; 402. Air outlet connector; 4021. Air outlet channel; 5. Connector; 6. PCB board; 601. Upper PCB board; 602. Lower PCB board; 603. MCU module; 6031. First operational amplifier; 6032. Second operational amplifier; 604. Second RC filter circuit; 605. LDO module; 606. First RC filter circuit; 7. Sealing ring; 8. Waterproof and breathable membrane; 11. First thread; 12. Second thread; 13. Third thread. Detailed Implementation

[0050] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0051] Example 1:

[0052] like Figure 1-3 As shown, this embodiment provides a combustible gas sensor module, including: a bare combustible gas sensor 1, an upper shell 2, a lower shell 3, a gas connector 4, a plug 5, and a PCB board 6; the lower shell 3 and the upper shell 2 are detachably connected, and the gas connector 4 is detachably mounted on the upper shell 2; the bare combustible gas sensor 1 and the PCB board 6 are electrically connected and assembled into a combination; the combination is detachably mounted on the lower shell 3 and located inside the upper shell 2; a buffer cavity 201 is provided inside the upper shell 2, and the gas connector 4 communicates with the buffer cavity 201; the buffer cavity 201 allows the gas to be measured to enter and exit through the gas connector 4, and the bare combustible gas sensor 1 can detect the gas to be measured in the buffer cavity 201; the plug 5 is mounted on the lower shell 3, and the PCB board 6 is electrically connected to the plug 5, and the PCB board 6 is connected to external components through the plug 5. The lower shell 3 and the upper shell 2 are threaded together by a third thread 13.

[0053] The PCB board 6 includes: an upper PCB board 601 and a lower PCB board 602; the bare combustible gas sensor 1, the upper PCB board 601 and the lower PCB board 602 are electrically connected from top to bottom and assembled into a fixed structure assembly; the assembly is fixed on the lower housing 3; the lower PCB board 602 is electrically connected to the connector 5, and the lower PCB board 602 is connected to the external components through the connector 5. The upper PCB board 601 and the lower PCB board 602 constitute a circuit structure. The circuit structure includes: an LDO module 605, a first RC filter circuit 606, an MCU module 603, and a second RC filter circuit 604. The MCU module 603 includes: a first operational amplifier 6031 and a second operational amplifier 6031. The LDO module 605 is connected to the bare combustible gas sensor 1 and is used to connect to a power source. The first connection terminal of the first RC filter circuit 606 is connected to the output terminal of the bare combustible gas sensor 1. The second connection terminal of the first RC filter circuit 606 is connected to the first power supply terminal of the first operational amplifier 6031. The output terminal of the first operational amplifier 6031 is connected to the first connection terminal of the second RC filter circuit 604. The second connection terminal of the second RC filter circuit 604 is connected to the first power supply terminal of the second operational amplifier 6031. The output terminal of the second operational amplifier 6031 is connected to the connector 5.

[0054] Gas connector 4 includes an inlet connector 401 and an outlet connector 402; the inlet connector 401 and the outlet connector 402 are connected to the buffer chamber 201; the gas to be tested enters the buffer chamber 201 through the inlet connector 401 and exits the buffer chamber 201 through the outlet connector 402. The upper outer shell 2 is provided with an inlet port 2021 and an outlet port 2022 connected to the buffer chamber 201; the inlet connector 401 is provided with an inlet channel 4011, and the outlet connector 402 is provided with an outlet channel 4021; the inlet port 2021 is connected to the inlet channel 4011, and the outlet port 2022 is connected to the outlet channel 4021; the gas to be tested travels along the inlet channel 4011, the inlet port 2021, the buffer chamber 201, the outlet port 2022, and the outlet channel 4021 in sequence, forming the detection gas path for the gas to be tested. The air inlet connector 401 is threaded to the upper outer casing 2 via the first thread 11; the air outlet connector 402 is threaded to the upper outer casing 2 via the second thread 12. The air inlet connector 401 and the air outlet connector 402 are pagoda-type structural components that can be connected to a pump-suction pipeline.

[0055] A sealing ring 7 is provided between the bare combustible gas sensor 1 and the upper housing 2; the bare combustible gas sensor 1 is sealed to the buffer cavity 201 through the sealing ring 7. A waterproof and breathable membrane 8 is provided on the bare combustible gas sensor 1; the gas to be measured passes through the waterproof and breathable membrane 8 and enters the gas detection concave surface 101 on the bare combustible gas sensor 1.

[0056] Example 2:

[0057] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0058] This embodiment provides a combustible gas sensor module, including: a bare combustible gas sensor 1, an upper housing 2, a lower housing 3, an inlet connector 401, an outlet connector 402, a connector 5, an upper PCB board 601, a lower PCB board 602, a sealing ring 7, and a waterproof and breathable membrane 8.

[0059] The bare combustible gas sensor 1, the upper PCB board 601 and the lower PCB board 602 are electrically connected from top to bottom and assembled into a fixed structure assembly. This assembly is fixed on the lower outer shell 3 and placed inside the upper outer shell 2. The lower outer shell 3 and the upper outer shell 2 are tightened and fixed by the third thread 13.

[0060] The bare combustible gas sensor 1 is fitted with the sealing ring 7 on its upper side. When the third thread 13 is tightened, the bare combustible gas sensor 1 presses against the sealing ring 7. The waterproof and breathable membrane 8 is attached to the upper surface of the bare combustible gas sensor 1.

[0061] The upper outer shell 2 has an air inlet connector 401 installed on the left side via a first thread 11, and an air outlet connector 402 installed on the right side via a second thread 12. Both threaded connections are sealed connections.

[0062] The connector 5 for external connection is provided on the lower side of the PCB lower plate 602.

[0063] In this embodiment, the module housing is divided into two parts: the upper housing 2 and the lower housing 3. The upper housing 2 and the lower housing 3 are connected by the third thread 13.

[0064] The upper housing 2 has two fixing threaded holes 203 on its flat end face. The fixing threaded holes 203 are used for fixing and installing the sensor in this embodiment.

[0065] The lower outer shell 3 has two opposite locking surfaces 301 on its cylindrical surface. The locking surfaces 301 are planar structures, which facilitates the use of disassembly and assembly tools such as wrenches.

[0066] During installation, the upper outer shell 2 is permanently fixed via the fixing threaded hole 203. Due to the presence of the third thread 13, the lower outer shell 3 is a detachable structure. When maintenance of the bare combustible gas sensor 1 is required, the lower outer shell 3 can be removed manually or with tools to take out the bare combustible gas sensor 1.

[0067] The upper outer shell 2 contains a buffer cavity 201, an air inlet 2021, and an air outlet 2022. The air inlet connector 401 contains an air inlet channel 4011, and the air outlet connector 402 contains an air outlet channel 4021. The air inlet 2021 communicates with the air inlet channel 4011, and the air outlet 2022 communicates with the air outlet channel 4021. The gas to be tested travels sequentially through the air inlet channel 4011, the air inlet 2021, the buffer cavity 201, the air outlet 2022, and the air outlet channel 4021, forming a sealed detection gas path.

[0068] The air inlet connector 401 and the air outlet connector 402 can be directly connected to a pump-suction pipeline.

[0069] The buffer cavity 201 is a relatively large space that slows down the flow rate of the gas to be tested. The gas to be tested passes through the waterproof and breathable membrane 8 and enters the gas detection concave surface 101 on the upper side of the bare combustible gas sensor 1.

[0070] The upper outer shell 2, the air inlet connector 401, and the air outlet connector 402 are all made of stainless steel, which is not prone to absorbing gas.

[0071] The bare combustible gas sensor 1 is electrically connected to the upper PCB board 601 via a pin 102 on its lower side. The upper PCB board 601 is electrically connected to the lower PCB board 602. The lower PCB board 602 is provided with a connector 5 for external connection on its lower side.

[0072] The upper PCB board 601 and the lower PCB board 602 constitute a data processing system, which converts the electrical signal acquired by the bare combustible gas sensor 1 into a relevant communication signal that can be used directly, and outputs it to the outside through the connector 5.

[0073] The data processing system comprised of the upper PCB board 601 and the lower PCB board 602 includes an LDO module 605, a first RC filter circuit 606, an MCU module 603, and a second RC filter circuit 604. The MCU module 603 internally includes a first operational amplifier 6031 and a second operational amplifier 6031. This data processing system converts the electrical signal acquired by the bare combustible gas sensor 1 into a directly usable relevant communication signal and outputs it externally through the connector 5.

[0074] This embodiment provides a combustible gas sensor module with a simple structure, small size, and easy assembly and disassembly. It includes both a closed structure that can be connected to a pump-suction pipeline and a data processing system that can directly acquire target signals, which greatly facilitates the use and maintenance of downstream customers.

[0075] The purpose of this embodiment is to address the deficiencies and shortcomings of the prior art by providing a combustible gas sensor module. This module includes a closed structure that can be connected to a pump-suction pipeline, a data processing system that can directly acquire target signals, and is easy to disassemble and maintain.

[0076] Example 3:

[0077] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0078] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides a combustible gas sensor module.

[0079] like Figure 1 As shown, the combustible gas sensor module provided in this embodiment includes: a bare combustible gas sensor 1, an upper shell 2, a lower shell 3, an inlet connector 401, an outlet connector 402, a connector 5, an upper PCB board 601 and a lower PCB board 602, a sealing ring 7, a waterproof and breathable membrane 8, a first thread 11, a second thread 12, and a third thread 13.

[0080] The bare combustible gas sensor 1 is fitted with the sealing ring 7 on its upper side. The bare combustible gas sensor 1, the upper PCB board 601, and the lower PCB board 602 are electrically connected sequentially from top to bottom, forming a fixed assembly. The lower PCB board 602 is secured to the lower outer shell 3, and the waterproof and breathable membrane 8 is attached to the upper surface of the combustible gas sensor 1.

[0081] The bare combustible gas sensor 1, the PCB upper plate 601 and the PCB lower plate 602 assembly are placed inside the upper housing 2.

[0082] Furthermore, the present invention divides the module housing into two parts: the upper housing 2 and the lower housing 3. The upper housing 2 and the lower housing 3 are connected by the third thread 13.

[0083] Furthermore, the upper outer shell 2 has two fixing threaded holes 203 on its flat end face, which are used for fixing and installing this utility model.

[0084] Furthermore, the lower outer shell 3 has two opposite locking surfaces 301 on its cylindrical surface. The locking surfaces 301 are planar structures, which facilitates the use of disassembly and assembly tools such as wrenches.

[0085] During installation, the upper outer shell 2 is permanently fixed via the fixing threaded hole 203. Due to the presence of the third thread 13, the lower outer shell 3 is a detachable structure. When maintenance of the bare combustible gas sensor 1 is required, the lower outer shell 3 can be removed manually or with tools to take out the bare combustible gas sensor 1.

[0086] Furthermore, when the third thread 13 is tightened, the bare combustible gas sensor 1 presses against the sealing ring 7, thereby achieving a seal between the sensor and the housing.

[0087] The upper outer shell 2 has an air inlet connector 401 installed on the left side via the first thread 11, and an air outlet connector 402 installed on the right side via the second thread 12. Both threaded connections are sealed connections, which are achieved by wrapping with Teflon raw material tape.

[0088] like Figure 1 As shown, the upper outer shell 2 structure contains a buffer cavity 201, an air inlet 2021, and an air outlet 2022. The air inlet connector 401 contains an air inlet channel 4011, and the air outlet connector 402 contains an air outlet channel 4021. The air inlet 2021 communicates with the air inlet channel 4011, and the air outlet 2022 communicates with the air outlet channel 4021.

[0089] In actual gas testing, the gas to be tested is arranged in the following order: the inlet channel 4011, the inlet hole 2021, the buffer cavity 201, the outlet hole 2022, and the outlet channel 4021, forming a sealed testing gas path.

[0090] Furthermore, the buffer cavity 201 is a relatively large space used to slow down the flow rate of the gas to be measured and increase the sensor response effect. The gas to be measured passes through the waterproof and breathable membrane 8 and enters the gas detection concave surface 101 on the upper side of the bare combustible gas sensor 1, and further enters the sensor to achieve detection.

[0091] Furthermore, the bare combustible gas sensor 1 is selected from the LEL4R-N57A sensor, which has excellent performance, is not easily poisoned, and is easy to recover from poisoning.

[0092] Furthermore, both the air inlet connector 401 and the air outlet connector 402 are pagoda-shaped structural components that can be directly connected to a pump-suction pipeline.

[0093] Furthermore, the upper outer shell 2, the air inlet connector 401, and the air outlet connector 402 are all made of stainless steel, which does not easily absorb gases. The sealing ring 7 is made of fluororubber, which does not easily absorb gases.

[0094] The bare combustible gas sensor 1 is electrically connected to the upper PCB board 601 via a pin 102 on its lower side. The upper PCB board 601 is electrically connected to the lower PCB board 602. The lower PCB board 602 is provided with a connector 5 for external connection on its lower side.

[0095] like Figure 2 As shown, the upper PCB board 601 and the lower PCB board 602 constitute a data processing system, which converts the analog electrical signal acquired by the bare combustible gas sensor 1 into a relevant communication signal that can be used directly, and outputs it to the outside through the connector 5.

[0096] like Figure 2 and Figure 3 As shown, the data processing system composed of the upper PCB board 601 and the lower PCB board 602 includes an LDO module 601, a first RC filter circuit 602, an MCU module 603 and a second RC filter circuit 604. The MCU module 603 internally includes a first operational amplifier 6031 and a second operational amplifier 6032.

[0097] When the system is working, it is supplied with 5V DC voltage from an external power source. The voltage is reduced to 2.5V by the LDO module 601 to power the bare combustible gas sensor 1. After the bare combustible gas sensor 1 is working, the collected detection signal is input to the MCU module 603 through the first RC filter circuit 602. The first operational amplifier 6031 inside the MCU module 603 performs analog-to-digital conversion and outputs a digital signal. Then, it passes through the second RC filter circuit 604 and enters the second operational amplifier 6032 inside the MCU module 603 to amplify the digital signal, thereby achieving the purpose of directly using relevant communication signals.

[0098] This utility model provides a combustible gas sensor module with a simple structure, small size, and convenient assembly and disassembly. It includes both a closed structure that can be connected to a pump-suction pipeline and a data processing system that can directly acquire target signals.

[0099] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0100] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A combustible gas sensor module, characterized in that, include: Bare combustible gas sensor (1), upper housing (2), lower housing (3), gas connector (4), connector (5), and PCB board (6); The lower outer shell (3) is detachably connected to the upper outer shell (2), and the gas connector (4) is detachably installed on the upper outer shell (2); The bare combustible gas sensor (1) and the PCB board (6) are electrically connected and assembled into a combination; the combination is detachably installed on the lower housing (3) and located inside the upper housing (2); The upper outer shell (2) is provided with a buffer cavity (201), and the gas connector (4) is connected to the buffer cavity (201); the buffer cavity (201) can allow the gas to be tested to enter and exit through the gas connector (4), and the bare combustible gas sensor (1) can detect the gas to be tested in the buffer cavity (201); The connector (5) is installed on the lower housing (3), the PCB board (6) is electrically connected to the connector (5), and the PCB board (6) is connected to the external components through the connector (5).

2. The combustible gas sensor module according to claim 1, characterized in that, The gas connector (4) includes: an inlet connector (401) and an outlet connector (402). The air inlet connector (401) and the air outlet connector (402) are connected to the buffer cavity (201); The gas to be tested enters the buffer chamber (201) through the inlet connector (401) and exits the buffer chamber (201) through the outlet connector (402).

3. The combustible gas sensor module according to claim 2, characterized in that, The upper outer shell (2) is provided with an air inlet (2021) and an air outlet (2022) communicating with the buffer cavity (201). The air inlet connector (401) is provided with an air inlet channel (4011), and the air outlet connector (402) is provided with an air outlet channel (4021). The air inlet (2021) is connected to the air inlet channel (4011), and the air outlet (2022) is connected to the air outlet channel (4021); The gas to be tested is arranged in the following order: the inlet channel (4011), the inlet hole (2021), the buffer cavity (201), the outlet hole (2022), and the outlet channel (4021) to form the detection gas path of the gas to be tested.

4. The combustible gas sensor module according to claim 1, characterized in that, The PCB board (6) includes: an upper PCB board (601) and a lower PCB board (602). The bare combustible gas sensor (1), the upper PCB board (601) and the lower PCB board (602) are electrically connected from top to bottom and assembled into the assembly with a fixed structure; the assembly is fixed on the lower outer shell (3); The PCB lower plate (602) is electrically connected to the connector (5), and the PCB lower plate (602) is connected to external components through the connector (5).

5. The combustible gas sensor module according to claim 2, characterized in that, The air inlet connector (401) is threadedly connected to the upper outer casing (2) via a first thread (11); The vent connector (402) is threadedly connected to the upper housing (2) via a second thread (12).

6. The combustible gas sensor module according to claim 1, characterized in that, The lower outer shell (3) and the upper outer shell (2) are connected by a third thread (13).

7. The combustible gas sensor module according to claim 1, characterized in that, A sealing ring (7) is provided between the bare combustible gas sensor (1) and the upper housing (2). The bare combustible gas sensor (1) is sealed to the buffer cavity (201) through the sealing ring (7).

8. The combustible gas sensor module according to claim 1, characterized in that, The bare combustible gas sensor (1) is provided with a waterproof and breathable membrane (8). The gas to be tested passes through the waterproof and breathable membrane (8) and enters the gas detection concave surface (101) on the bare combustible gas sensor (1).

9. The combustible gas sensor module according to claim 2, characterized in that, The air inlet connector (401) and the air outlet connector (402) are pagoda-shaped structural components that can be connected to a pump-suction pipeline.

10. The combustible gas sensor module according to claim 4, characterized in that, The upper PCB board (601) and the lower PCB board (602) constitute a circuit structure; The circuit structure includes: an LDO module (605), a first RC filter circuit (606), an MCU module (603), and a second RC filter circuit (604). The MCU module (603) includes: a first operational amplifier (6031) and a second operational amplifier (6032); The LDO module (605) is connected to the bare combustible gas sensor (1), and the LDO module (605) is used to connect to a power source; The first connection terminal of the first RC filter circuit (606) is connected to the output terminal of the bare combustible gas sensor (1); The second connection terminal of the first RC filter circuit (606) is connected to the first power supply terminal of the first operational amplifier (6031); The output terminal of the first operational amplifier (6031) is connected to the first connection terminal of the second RC filter circuit (604); The second connection terminal of the second RC filter circuit (604) is connected to the first power supply terminal of the second operational amplifier (6032); The output of the second operational amplifier (6032) is connected to the connector (5).

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