An exhaust gas monitoring device

Abstract

The utility model relates to a kind of waste gas monitoring devices, including shell with inner cavity and two ends are equipped with air inlet pipe and air outlet pipe respectively;Filtering component is located in the inner cavity one end close to air inlet pipe, sensor mounting assembly is equipped with multiple and located shell one end close to air outlet pipe, sensor mounting assembly includes the mounting cylinder on the side wall of shell, the inner end of mounting cylinder movably is equipped with plugging piece, the outer end of mounting cylinder is detachably inserted with sensor support, the inner extension end of sensor support can push plugging piece to move to open the inner extension end opening of mounting cylinder, it is installed into mounting cylinder by sensor support, while plugging piece is pushed open, the installation of sensor can be completed, waste gas is monitored;And after sensor support is taken out, the inner end opening of mounting cylinder is plugged under the reset action of first elastic member by plug, avoid the waste gas leakage in shell, realize the quick disassembly of sensor, it is convenient to maintain, replace sensor.

Description

Technical Field

[0001] This utility model relates to the field of waste gas monitoring technology, and specifically to a waste gas monitoring device. Background Technology

[0002] Chemical waste gas refers to the toxic and harmful gases discharged from chemical plants during chemical production. Chemical waste gas often contains a wide variety of pollutants with complex physical and chemical properties and varying toxicity levels, seriously polluting the environment and affecting human health. The composition of chemical waste gas varies greatly between different chemical production industries. For example, waste gas from the chlor-alkali industry mainly contains chlorine, hydrogen chloride, vinyl chloride, mercury, and acetylene, while waste gas from the nitrogen fertilizer industry mainly contains nitrogen oxides, urea dust, carbon monoxide, ammonia, sulfur dioxide, and methane. Chemical waste gas must undergo a series of treatments to meet national emission standards before being released into the atmosphere. However, even after treatment, it is still uncertain whether the industrial waste gas meets the standards, so real-time monitoring and further treatment of the treated industrial waste gas are necessary.

[0003] Since the exhaust gas contains dust particles, moisture and other substances, a filtration mechanism is usually installed before detection to improve the accuracy of monitoring. For example, an industrial exhaust gas treatment monitoring device disclosed in the patent document with announcement number "CN219391979U" has a filtration mechanism installed at the air inlet, while its monitoring mechanism is installed inside the cylinder. The air quality sensor of the monitoring mechanism monitors the filtered gas.

[0004] For example, the patent document with announcement number "CN222825519U" discloses an online monitoring device for waste gas treatment. Its quality sensor, temperature sensor and other sensors are installed on the upper side of the inner wall of the treatment tank, and the waste gas treated by the filter plate, activated carbon filter and electromagnet flows through the sensors to monitor the gas quality.

[0005] In existing technologies, sensors are all located inside processing tanks or cylinders. However, most sensors are susceptible to contamination and require regular maintenance and calibration, or even replacement, depending on the operating environment and type. Using current methods, the system must be shut down and the device disassembled to remove the sensors, which is complex and inconvenient for maintenance. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides an exhaust gas monitoring device. After installing various sensors using a sensor support component, the sensor support component is inserted into an installation cylinder, and the sealing component is opened to complete the sensor installation. The exhaust gas inside the housing can then contact the sensor probe for monitoring. After removing the sensor support component, the plug of the sealing component, under the reset action of the first elastic component, seals the inner opening of the installation cylinder, preventing exhaust gas leakage from the housing. This allows for quick sensor installation and removal, facilitating sensor maintenance and improving the monitoring accuracy of the exhaust gas detection device.

[0007] This utility model provides an exhaust gas monitoring device to solve the above-mentioned technical problems, comprising:

[0008] The outer shell has an inner cavity and an air inlet pipe and an air outlet pipe at each end;

[0009] The filter assembly is located in the inner cavity near one end of the air intake pipe.

[0010] The sensor mounting assembly includes multiple sets located at one end of the housing near the air outlet pipe. The sensor mounting assembly includes a mounting cylinder on the side wall of the housing, with openings at both ends. A sealing member is movably provided at the inner end of the mounting cylinder, and a sensor support member is detachably inserted at the outer end of the mounting cylinder. The inner extension end of the sensor support member can push the sealing member to move and open the opening at the inner extension end of the mounting cylinder.

[0011] Furthermore, the sealing element includes:

[0012] The plug can move along the axial direction of the mounting cylinder.

[0013] The first support base has a plurality of first support bars fixed to the inner sidewall of the outer shell and a first support plate fixed to the first support bars;

[0014] The first elastic element has one end fixed to the first support plate and the other end fixed to the plug.

[0015] Furthermore, the sensor support includes:

[0016] The sensor mounting base has a receiving cavity with an opening on one side and a first vent communicating with the receiving cavity;

[0017] An ejector is provided at one end of the sensor mounting base away from the receiving cavity, and includes at least one second support bar connected to the sensor mounting base and a top plate connected to the free end of the second support bar;

[0018] An inner cover is located on the side of the sensor mounting base away from the ejector.

[0019] Furthermore, it also includes:

[0020] A guide groove extends axially along the mounting cylinder and has an open end.

[0021] An arc-shaped positioning groove extends circumferentially along the mounting cylinder, and one end is connected to the guide groove;

[0022] The positioning protrusion is provided on the outer peripheral wall of the sensor mounting base and slides in cooperation with the guide groove and the arc-shaped positioning groove.

[0023] Furthermore, it also includes:

[0024] A fixing ring is fixedly disposed on the inner peripheral wall of the mounting cylinder and located on the side close to the inner cavity;

[0025] A movable ring is movably positioned on the side of the fixed ring away from the inner cavity;

[0026] The second elastic element has one end connected to the fixed ring and the other end connected to the movable ring.

[0027] Furthermore, at least one set of sealing rings is provided on the outer peripheral wall of the sensor mounting base.

[0028] Furthermore, it also includes an outer cover, which is detachably mounted on the extended end of the mounting cylinder.

[0029] The beneficial effects of this utility model are as follows: the air inlet pipe of the outer shell can be connected to the exhaust pipe of the waste gas treatment device, and its air outlet pipe can be connected to a suction pump or other suction mechanism. The filter assembly is located in the inner cavity near the air inlet pipe, and the sensor mounting assembly is located in the outer shell near the air outlet pipe. The filter assembly filters particulate matter and moisture in the waste gas, preventing impurities such as particulate matter and water vapor in the gas from affecting the detection accuracy of the sensor. Multiple sets of sensor mounting assemblies are provided to facilitate the installation of different types of sensors. The sensor mounting assembly includes a mounting cylinder located on the side wall of the outer shell. The mounting cylinder has openings at both ends, with the inner end opening communicating with the inner cavity of the outer shell, and the outer end opening facilitating the insertion of the sensor support into the mounting cylinder. A sealing member is movably provided at the inner end of the mounting cylinder, which, in its natural state, seals the inner end opening of the mounting cylinder. The sensor support is used to install the sensor and is detachably inserted into the mounting cylinder, facilitating the disassembly and assembly of the sensor support, and thus facilitating the disassembly, assembly, and maintenance of the sensor. When the sensor support is inserted into the mounting cylinder, the inner end of the sensor support can push the sealing member to move and open the inner end opening of the mounting cylinder, so that the exhaust gas in the inner cavity of the housing can flow into the sensor.

[0030] During use, when the sensor support is not installed, the sealing element blocks the inner end opening of the mounting cylinder to prevent exhaust gas leakage from the housing. When the sensor needs to be installed, the corresponding sensor is inserted into the sensor support, and then the sensor support is inserted into the mounting cylinder. After the inner end of the sensor support abuts against the sealing element, the sensor support is continuously pushed, causing it to continue pushing the sealing element inwards until the sealing element disengages from the inner end opening of the mounting cylinder. At this point, the airflow channel of the mounting cylinder is connected to the sensor, and the sensor monitors the exhaust gas. When the sensor needs maintenance or replacement, the sensor support is pulled out of the mounting cylinder. The plug of the sealing element, under the reset action of the first elastic element, seals the inner end opening of the mounting cylinder, thus preventing exhaust gas leakage from the housing. This completes the disassembly of the sensor support, and consequently, the disassembly and assembly of the sensor.

[0031] In summary, this invention allows for the installation of various sensors via a sensor support component. The sensor support component is inserted into the mounting cylinder, and the sealing component is then opened to complete the sensor installation. The exhaust gas inside the housing can then contact the sensor probe for monitoring. After the sensor support component is removed, the plug of the sealing component, under the resetting action of the first elastic element, seals the inner opening of the mounting cylinder, preventing exhaust gas leakage from the housing. This enables rapid sensor assembly and disassembly, facilitating sensor maintenance and improving the monitoring accuracy of the exhaust gas detection device.

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 for Figure 1 A magnified view of the details of A;

[0035] Figure 3 This is a schematic diagram of the structure of the elastic reset component of this utility model;

[0036] Figure 4 for Figure 3 A magnified view of the details of B.

[0037] In the attached diagram: 100-outer shell, 110-inlet pipe, 120-outlet pipe, 130-inner cavity, 200-filter assembly, 300-sensor mounting assembly, 310-mounting cylinder, 311-guide groove, 312-arc positioning groove, 313-fixed ring, 314-moving ring, 315-second elastic element, 320-sealing element, 321-plug, 322-first support base, 3221-first support bar, 3222-first support plate, 323-first elastic element, 330-sensor support, 331-sensor mounting base, 3311-accommodating cavity, 3312-first vent hole, 3313-positioning protrusion, 3314-sealing ring, 332-ejector, 3321-second support bar, 3322-top plate, 333-inner cover, 340-outer cover. Detailed Implementation

[0038] Referring to the accompanying drawings, the specific embodiments of this utility model will be described in detail.

[0039] Reference Figures 1 to 4 This utility model provides an embodiment of an exhaust gas monitoring device.

[0040] An exhaust gas monitoring device includes a housing 100, a filter assembly 200, and a sensor mounting assembly 300. The housing 100 has an inner cavity 130 and an inlet pipe 110 and an outlet pipe 120 at its two ends, respectively. The inlet pipe 110 can be connected to the exhaust end of an exhaust gas treatment device, and the treated exhaust gas enters the inner cavity 130 of the housing 100 through the inlet pipe 110. The outlet pipe 120 can be connected to a suction pump or other suction mechanism to facilitate the smooth flow of the treated exhaust gas within the inner cavity 130 of the housing 100. The suction pump can be an existing one, which will not be described in detail here.

[0041] The filter assembly 200 is located in the inner cavity 130 near one end of the air inlet pipe 110, and is used to filter dust particles, water vapor, and other interfering substances in the exhaust gas entering the inner cavity 130 of the outer casing 100. The filter assembly 200 can be installed using conventional detachable methods for easy maintenance. For example, the outer casing 100 can be provided with an openable and closable sealing door, and a groove protruding from the inner wall of the outer casing 100 can be provided to insert the filter assembly 200 into the groove for installation; alternatively, an insertion port can be provided on the outer casing 100, through which the filter assembly 200 is inserted into the outer casing 100, and a sealing element is provided between the outer end of the filter assembly 200 and the outer casing 100 to prevent exhaust gas leakage from the outer casing 100.

[0042] Furthermore, the filter assembly 200 can be made of different materials depending on the type of exhaust gas, as long as it can remove interfering monitoring items in the exhaust gas. For example, it can use stainless steel sintered filter elements to filter particles, hydrophobic membranes to remove water vapor, activated carbon adsorption, etc. These methods can be used individually or in combination, and will not be elaborated here.

[0043] Multiple sensor mounting assemblies 300 are provided and located at one end of the housing 100 near the outlet pipe 120. The sensor mounting assembly 300 is used to mount sensors, and one or more sets of sensors can be selected based on the substances to be monitored. For example, Fusheng Electronics' industrial-grade electrochemical gas sensors can select electrochemical sensors for carbon monoxide, hydrogen sulfide, etc., depending on the monitoring requirements. Alternatively, a comprehensive air quality sensor, such as sensor model FS00802C, can also be selected.

[0044] Furthermore, it also includes an outer cover 340, which is detachably mounted on the extended end of the mounting cylinder 310. The outer cover 340 can be installed using threads, screws, or other methods. In this embodiment, the inner peripheral wall of the outer cover 340 is provided with internal threads, and the outer peripheral wall of the mounting cylinder 310 is provided with external threads. The outer cover 340 is installed by the engagement of the internal and external threads. Furthermore, a sealing ring can be provided between the ends of the outer cover 340 and the mounting cylinder 310 to improve sealing performance and further prevent exhaust gas leakage.

[0045] In some embodiments, the sensor mounting assembly 300 includes a mounting cylinder 310, a sealing member 320, and a sensor support member 330. The mounting cylinder 310 is disposed on the side wall of the housing 100, with openings at both ends. The inner end of the mounting cylinder 310 communicates with the inner cavity 130 of the housing 100, while the outer end facilitates the insertion of the sensor support member 330 into the mounting cylinder 310. The sealing member 320 is movably provided at the inner end of the mounting cylinder 310. In its natural state, the sealing member 320 seals the inner end opening of the mounting cylinder 310, preventing exhaust gas from leaking from the mounting cylinder 310. The outer end of the mounting cylinder 310 is detachably connected to the sensor support member 330, which supports the sensor. This detachable connection facilitates the assembly and disassembly of the sensor support member 330, thereby facilitating sensor replacement and maintenance. The inner end of the sensor support 330 can push the sealing member 320 to move and open the inner end opening of the mounting cylinder 310. When the sensor support 330 is inserted into the mounting cylinder 310, the sensor support 330 can push the sealing member 320 to move into the interior of the housing 100, thereby disengaging the sealing member 320 from the inner end opening of the mounting cylinder 310 and connecting the inner cavity 130 of the housing 100 with the sensing end of the sensor on the sensor support 330.

[0046] In this method, various sensors are installed using the sensor support 330. The sensor support 330 is inserted into the mounting cylinder 310, and the sealing member 320 is pushed open to complete the sensor installation. The exhaust gas inside the housing 100 can contact the sensor probe to monitor the exhaust gas. After the sensor support 330 is removed, the sealing member 320, under the resetting action, seals the inner end opening of the mounting cylinder 310 to prevent exhaust gas leakage inside the housing 100. There is no need to disassemble the entire device, which can realize quick disassembly and assembly of the sensor, facilitate sensor maintenance, and improve the monitoring accuracy of the exhaust gas detection device.

[0047] In some embodiments, the sealing member 320 includes a plug 321, a first support 322, and a first elastic member 323. The sealing member 320 only needs to be able to block or open the airflow channel of the mounting cylinder 310. The sealing member 320 can be disposed inside the mounting cylinder 310, and a sealing ring adapted to the plug 321 can be fixedly disposed inside the mounting cylinder 310. The sealing ring cooperates with the plug 321 to cut off the airflow channel of the mounting cylinder 310. In this embodiment, to prevent exhaust gas from remaining inside the mounting cylinder 310, the sealing member 320 can be disposed inside the outer shell 100 and protrude from the inner end of the mounting cylinder 310. The plug 321 of the sealing member 320 blocks the opening of the inner end of the mounting cylinder 310. After the sensor support 330 is inserted into the mounting cylinder 310, the sensing end of the sensor protrudes from the inner peripheral wall of the outer shell 100, allowing it to fully contact the exhaust gas inside the outer shell 100.

[0048] The plug 321 can move along the axial direction of the mounting cylinder 310 so that it can abut against the inner end opening of the mounting cylinder 310 to block the airflow passage of the mounting cylinder 310; or it can detach from it to open the airflow passage.

[0049] The first support base 322 is used to support the plug 321, and has multiple first support bars 3221 fixed to the inner sidewall of the outer casing 100 and first support plates 3222 fixed to the first support bars 3221. The first support bars 3221 can be configured in two, three, or four groups, etc., and can be evenly distributed circumferentially around the inner end opening of the mounting cylinder 310 to ensure stable support for the first support plates 3222. Preferably, two groups of first support bars 3221 are provided and arranged along the circumferential direction of the outer casing 100 so as to avoid the airflow direction and not obstruct the flow of exhaust gas.

[0050] One end of the first elastic element 323 is fixed to the first support plate 3222, and the other end is fixed to the plug 321. When the plug 321 is pressed and moves towards the first support plate 3222, the first elastic element 323 is compressed, and the plug 321 disengages from the inner end opening of the mounting cylinder 310, allowing the mounting cylinder 310 to communicate with the inner cavity 130 of the outer casing 100, thus allowing exhaust gas to enter the sensor. In its natural state, the first elastic element 323 releases its elastic potential energy, pushing the plug 321 to seal the inner end opening of the mounting cylinder 310, preventing exhaust gas leakage.

[0051] In some embodiments, the sensor support 330 includes a sensor mounting base 331, an ejector 332, and an inner cover 333.

[0052] The sensor mounting base 331 is used to install various sensors. It has a receiving cavity 3311 with an opening on one side and a first vent 3312 communicating with the receiving cavity 3311. The sensor is installed in the receiving cavity 3311 through the opening, so that its sensing end is located on the side of the first vent 3312. It can be understood that the sensor mounting base 331 can be provided with wire holes, mounting screw holes, etc. for installing and fixing the sensor.

[0053] The ejector 332 is located at the end of the sensor mounting base 331 away from the receiving cavity 3311, and includes at least one second support bar 3321 connected to the sensor mounting base 331 and a top plate 3322 connected to the free end of the second support bar 3321. At this time, there is a gap between the top plate 3322 and the sensor mounting base 331. After the top plate 3322 pushes open the plug 321, exhaust gas can pass through the gap and the first vent 3312 to contact the sensing end of the sensor. Two, three, or four sets of the second support bar 3321 can be provided; in this embodiment, two sets of the second support bar 3321 are provided.

[0054] The inner cover 333 is located on the side of the sensor mounting base 331 away from the ejector 332, and is used to close the receiving cavity 3311. To facilitate the insertion or removal of the sensor support 330 from the mounting cylinder 310, an operating protrusion may be provided on the inner cover 333.

[0055] Furthermore, the outer peripheral wall of the sensor mounting base 331 is provided with at least one set of sealing rings 3314. One, two, or three sets of sealing rings 3314 can be provided, and existing sealing materials, such as elastic rubber rings, can be used. Specifically, an annular groove is provided on the outer peripheral wall of the sensor mounting base 331. The sealing rings 3314 are inserted into the annular groove, and a portion protrudes from the annular groove and contacts the inner peripheral wall of the mounting cylinder 310 to seal between the mounting cylinder 310 and the sensor mounting base 331, preventing exhaust gas leakage.

[0056] In some embodiments, the mounting cylinder 310 is further provided with a guide groove 311 and an arc-shaped positioning groove 312, and the sensor support 330 is provided with a guide protrusion. The insertion of the sensor support 330 is guided and limited by the cooperation between the guide protrusion and the guide groove 311 and the arc-shaped positioning groove 312.

[0057] Specifically, the guide groove 311 extends axially along the mounting cylinder 310 and has an open outer end. The arc-shaped positioning groove 312 extends circumferentially along the mounting cylinder 310 and communicates with the guide groove 311 at one end. The positioning protrusion 3313 is provided on the outer peripheral wall of the sensor mounting base 331 and slides in cooperation with the guide groove 311 and the arc-shaped positioning groove 312. During installation, the positioning protrusion 3313 on the sensor mounting base 331 is inserted into the guide groove 311, pushing the sensor mounting base 331 to move axially along the mounting cylinder 310 until the positioning protrusion 3313 moves to the inner end of the guide groove 311, limiting the insertion depth of the sensor mounting base 331. At this time, rotating the sensor mounting base 331 allows the positioning protrusion 3313 to enter the arc-shaped positioning groove 312, positioning the sensor and locking it inside the mounting cylinder 310. This keeps the ejector 332 on the inner end of the sensor mounting base 331 in a state where the plug 321 is pushed open.

[0058] In some embodiments, such as Figure 3-4 As shown, an elastic reset member can also be provided inside the mounting cylinder 310 between the sealing member 320 and the sensor mounting base 331 to push the sensor support member 330 out of the mounting cylinder 310. At this time, when it is necessary to disassemble the sensor support member 330, the sensor mounting base 331 is rotated so that the positioning protrusion 3313 on it enters the guide groove 311. The sensor mounting base 331 can then pop out of the mounting cylinder 310 under the reset action of the elastic reset member, which facilitates the replacement and maintenance of the sensor.

[0059] Specifically, the elastic reset member includes a fixed ring 313, a movable ring 314, and a second elastic member 315.

[0060] The fixed ring 313 is fixedly disposed on the inner peripheral wall of the mounting cylinder 310 and located on the side close to the inner cavity 130, the movable ring 314 is movably disposed on the side of the fixed ring 313 away from the inner cavity 130, and one end of the second elastic member 315 is connected to the fixed ring 313 and the other end is connected to the movable ring 314.

[0061] When the sensor support 330 is inserted into the mounting cylinder 310, the ejector 332 on the sensor mounting base 331 passes through the fixed ring 313 and the movable ring 314 to push open the sealing member 320. The edge of the sensor mounting base 331 abuts against the movable ring 314, pushing the movable ring 314 towards the fixed ring 313, compressing the second elastic member 315. After insertion, the positioning protrusion 3313 rotates into the arc-shaped positioning groove 312 to position the sensor mounting base 331. When it is necessary to remove the sensor mounting base 331, rotate the sensor mounting base 331 so that its positioning protrusion 3313 enters the guide groove 311 from the arc-shaped positioning groove 312. When the external force is removed, the second elastic member 315 releases its elastic potential energy, pushing the movable ring 314 away from the fixed ring 313, thereby pushing the sensor mounting base 331 out of the mounting cylinder 310.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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.

[0063] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste gas monitoring device, characterized in that, include: The outer shell (100) has an inner cavity (130) and an air inlet pipe (110) and an air outlet pipe (120) at both ends respectively; A filter assembly (200) is disposed in the inner cavity (130) near one end of the air intake pipe (110). The sensor mounting assembly (300) is provided with multiple sets and located at one end of the housing (100) near the air outlet pipe (120). The sensor mounting assembly (300) includes a mounting cylinder (310) provided on the side wall of the housing (100). The mounting cylinder (310) has openings at both ends. A sealing member (320) is movably provided at the inner end of the mounting cylinder (310). A sensor support member (330) is detachably inserted into the outer end of the mounting cylinder (310). The inner extension end of the sensor support member (330) can push the sealing member (320) to move to open the inner extension end opening of the mounting cylinder (310).

2. The exhaust gas monitoring device according to claim 1, characterized in that, The sealing element (320) includes: The plug (321) is movable along the axial direction of the mounting cylinder (310). The first support base (322) has a plurality of first support bars (3221) fixed to the inner sidewall of the outer shell (100) and a first support plate (3222) fixed to the first support bars (3221); The first elastic element (323) is fixed at one end to the first support plate (3222) and at the other end to the plug (321).

3. The exhaust gas monitoring device according to claim 1, characterized in that, The sensor support (330) includes: The sensor mounting base (331) has a receiving cavity (3311) with an opening on one side and a first vent (3312) communicating with the receiving cavity (3311); An ejector (332) is provided at one end of the sensor mounting base (331) away from the receiving cavity (3311), and includes at least one second support bar (3321) connected to the sensor mounting base (331) and a top plate (3322) connected to the free end of the second support bar (3321); An inner cover (333) is provided on the side of the sensor mounting base (331) away from the ejector (332).

4. The exhaust gas monitoring device according to claim 3, characterized in that, Also includes: The guide groove (311) extends axially along the mounting cylinder (310) and has an open end; An arc-shaped positioning groove (312) extends circumferentially along the mounting cylinder (310), and one end is connected to the guide groove (311); The positioning protrusion (3313) is provided on the outer peripheral wall of the sensor mounting base (331) and slides in cooperation with the guide groove (311) and the arc-shaped positioning groove (312).

5. The exhaust gas monitoring device according to claim 3, characterized in that, Also includes: A fixing ring (313) is fixedly disposed on the inner peripheral wall of the mounting cylinder (310) and located on the side close to the inner cavity (130); The movable ring (314) is movably disposed on the side of the fixed ring (313) away from the inner cavity (130); The second elastic element (315) is connected at one end to the fixed ring (313) and at the other end to the movable ring (314).

6. The exhaust gas monitoring device according to claim 3, characterized in that, At least one set of sealing rings (3314) are provided on the outer peripheral wall of the sensor mounting base (331).

7. The exhaust gas monitoring device according to claim 1, characterized in that, It also includes an outer cover (340), which is detachably mounted on the extended end of the mounting cylinder (310).

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