Gas detector

Abstract

The utility model provides a gas detector, which comprises a shell provided with an explosion-proof cavity and an opening which are communicated with each other; the connecting plate is detachably arranged at the opening, the connecting plate can block the opening, and the connecting plate and the shell are matched to form an anti-explosion structure; the first circuit board is fixed to the side, close to the shell, of the connecting plate, and the first circuit board is arranged in the anti-explosion cavity; the detection assembly is detachably arranged on the side, away from the shell, of the connecting plate, the detection assembly is provided with a detection cavity and a sensor body, the sensor body is located in the detection cavity and used for detecting gas, the sensor body is electrically connected with the first circuit board, and the detection cavity and the anti-explosion cavity are independently arranged. Through the technical scheme provided by the invention, the problem that a sensor in a gas detector is inconvenient to maintain and replace by a worker in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detectors, in particular to a gas detector. Background Art

[0002] At the sites of the petroleum, chemical, thermal, nuclear power and other industries, there is always the possibility of the generation of methane, hydrogen sulfide, carbon monoxide, oxygen and other gases. Some of these gases can burn and explode, and some directly endanger the lives of workers, so these gases must be monitored in real time and managed in a digital manner. At present, point-type gas detectors are usually used at the sites of these industries, that is, gas detectors are fixed in various areas of the site. If the above gases leak and reach a concentration that can burn, explode and harm the health of personnel, the gas detector will alarm in time, and the staff can quickly take corresponding measures, such as cutting off the valve and fleeing the scene as soon as possible, thereby avoiding loss of life and property.

[0003] Specifically, gas detectors are divided into two categories, intrinsically safe and flameproof. The intrinsically safe type means that the internal components of the gas detector itself will not explode, while the flameproof type means that the components in the gas detector that may ignite the explosive gas mixture are sealed in an outer casing. The outer casing can withstand the internal explosion of the flammable mixture that penetrates into the interior of the outer casing through any joint surface or structural gap of the outer casing without being damaged, and will not cause ignition of the external explosive environment formed by one or more gases or vapors.

[0004] In layman's terms, explosion-proof type means that the components that may generate sparks, arcs and dangerous temperatures are placed in a explosion-proof casing. The explosion-proof casing separates the internal space of the gas detector from the surrounding environment. There is a gap in the explosion-proof casing. Due to the gas penetration of the gas detector, there may be an explosive gas mixture inside. When an explosion occurs, the explosion-proof casing can withstand the explosion pressure generated without being damaged. At the same time, the gap in the explosion-proof casing can cool the flame, reduce the flame propagation speed or terminate the acceleration chain, so that the flame or dangerous flame products cannot pass through the explosion-proof gap and ignite the external explosive environment, thereby achieving the purpose of explosion-proof.

[0005] Among them, when installing the explosion-proof gas detector, the sensor for detecting gas is usually installed in the explosion-proof housing, and the gas detector has the possibility of repairing or replacing the sensor during use. In the prior art, in the process of repairing or replacing the sensor, the entire gas detector needs to be dismantled, that is, the explosion-proof housing needs to be opened, which increases the labor intensity of the staff and is inconvenient for the staff to repair and replace the sensor. For example, the patent document with application number 201910482442.7 provides a mining smoke sensor, which specifically discloses a sensor housing, a circuit board with a sensor circuit installed, and the sensor housing includes at least a base, an inner cover and an outer cover, the circuit board is installed in the cavity of the base, and the openings of the gas-sensitive probe and the alarm indicator light are arranged at the bottom of the base, the gas-sensitive probe and the alarm indicator light installed on the circuit board correspond to the openings on the base, and the inner cover is connected to the base and the gas-sensitive probe opening is placed therein. With such a setting, when the staff replaces or repairs the gas-sensitive probe, they need to dismantle the outer cover, the inner cover and the base, which increases the labor intensity of the staff and is inconvenient for the staff to repair and replace the gas-sensitive probe. Utility Model Content

[0006] The utility model provides a gas detector to solve the problem of sensors in the gas detector in the prior art being inconvenient for workers to repair and replace.

[0007] The utility model provides a gas detector, which comprises: a shell, the shell having an explosion-proof cavity and an opening which are interconnected; a connecting plate, which is detachably arranged at the opening, the connecting plate can block the opening, and the connecting plate cooperates with the shell to form an explosion-proof structure; a first circuit board, which is fixed to a side of the connecting plate close to the shell, and the first circuit board is arranged in the explosion-proof cavity; a detection component, which is detachably arranged on a side of the connecting plate away from the shell, the detection component having a detection cavity and a sensor body, the sensor body is located in the detection cavity, the sensor body is used to detect gas, the sensor body is electrically connected to the first circuit board, and the detection cavity and the explosion-proof cavity are independently arranged.

[0008] Furthermore, the gas detector also includes a heat insulation structure, which is located between the first circuit board and the connecting plate, and surrounds the periphery of the components on the first circuit board.

[0009] Furthermore, the thermal insulation structure is sealed by glue filling.

[0010] Furthermore, the detection component also includes: a base, the base and the connecting plate are detachably connected via a first locking member; an upper cover, detachably covered on the outer side of the base, a detection cavity is provided between the upper cover and the base, a connecting port is provided on the upper cover, and the connecting port is connected to the detection cavity.

[0011] Furthermore, a first wire passing hole is provided on the connecting plate, a second wire passing hole is provided on the base, the detection component also includes a second circuit board, the second circuit board is provided on the base, the sensor body is provided on the second circuit board, the second circuit board is electrically connected to the sensor body, and the second circuit board is electrically connected to the first circuit board through the first wire passing hole and the second wire passing hole.

[0012] Furthermore, the detection component also includes a fixed shell, which is arranged on the second circuit board. A fixed cavity is provided between the fixed shell and the second circuit board. The sensor body is arranged in the fixed cavity. A plurality of filter holes are provided on the outer wall of the fixed shell. The plurality of filter holes can connect the fixed cavity and the detection cavity.

[0013] Furthermore, the sensor body is arranged in the middle of the fixed cavity, and the inner wall of the fixed shell is provided with guide ribs to guide the gas to the sensor body.

[0014] Furthermore, the detection component also includes an alarm, which is arranged on the second circuit board and is electrically connected to the second circuit board.

[0015] Furthermore, a connection hole is provided on the shell, the connection hole is communicated with the explosion-proof cavity, and a wire guide is provided at the connection hole, and the wire guide is used to electrically connect the wire to the second circuit board.

[0016] Furthermore, a snap-fit ​​structure is provided between the upper cover and the base, and the upper cover and the base are detachably connected via the snap-fit ​​structure.

[0017] According to the technical solution of the utility model, the first circuit board is arranged in the explosion-proof cavity of the shell, the first connecting plate is arranged at the opening of the shell, and the first circuit board is fixed on the connecting plate. The detection component includes a detection cavity and a sensor body, the sensor body is arranged in the detection cavity, and the detection component is detachably arranged on the side of the connecting plate away from the first circuit board. With such arrangement, when the sensor body needs to be replaced or repaired, it is only necessary to disassemble the detection component without disassembling the explosion-proof structure, which is convenient for the staff to replace and repair the sensor body and reduces the work intensity of the staff. At the same time, in the prior art, when the staff removes the gas detector and opens the explosion-proof shell, it is very likely to damage the explosion-proof shell, or make mistakes when reassembling the gas detector, thereby affecting the explosion-proof effect of the explosion-proof shell. However, in the present application, it is not necessary to open the explosion-proof structure, which can avoid the explosion-proof effect of the explosion-proof structure being affected by repeated disassembly, thereby ensuring the explosion-proof effect of the explosion-proof structure on the first circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 The structure diagram of the gas detector provided by the utility model is shown;

[0020] Figure 2 An exploded view of the gas detector provided by the utility model is shown;

[0021] Figure 3 Shows Figure 2 A partial enlarged view of the middle A;

[0022] Figure 4 The figure shows a structural schematic diagram of the fixing shell provided by the utility model.

[0023] The above drawings include the following reference numerals:

[0024] 10. Shell;

[0025] 11. Explosion-proof chamber; 12. Opening; 13. Connection hole;

[0026] 20. Connecting plate;

[0027] 21. First wire hole; 22. Slot;

[0028] 30. A first circuit board;

[0029] 40. Detection components;

[0030] 41. Detection cavity;

[0031] 42. Sensor body;

[0032] 43. base; 431. connecting protrusion;

[0033] 44. upper cover; 441. connecting opening; 442. connecting rib; 443. connecting groove;

[0034] 45. A first locking member;

[0035] 46, fixed shell; 461, fixed cavity; 462, filter hole;

[0036] 463, guide rib; 4631, connecting section; 4632, inclined section;

[0037] 47. Alarm;

[0038] 48. A second circuit board;

[0039] 50. Thermal insulation structure;

[0040] 60. Wire guide;

[0041] 71. Sealing ring; 72. Second locking member; 73. Third locking member;

[0042] 100. Components. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0044] like Figures 1 to 4 As shown, an embodiment of the utility model provides a gas detector, which includes a housing 10, a connecting plate 20, a first circuit board 30 and a detection assembly 40. The housing 10 has an explosion-proof cavity 11 and an opening 12 that are interconnected. The connecting plate 20 is detachably arranged at the opening 12, and the connecting plate 20 can block the opening 12, and the connecting plate 20 cooperates with the housing 10 to form an explosion-proof structure. The first circuit board 30 is fixed to a side of the connecting plate 20 close to the housing 10, and the first circuit board 30 is arranged in the explosion-proof cavity 11. The detection assembly 40 is detachably arranged on a side of the connecting plate 20 away from the housing 10, and the detection assembly 40 has a detection cavity 41 and a sensor body 42, the sensor body 42 is located in the detection cavity 41, the sensor body 42 is used to detect gas, the sensor body 42 is electrically connected to the first circuit board 30, and the detection cavity 41 is independently arranged from the explosion-proof cavity 11. Among them, in the present application, components 100 that may generate sparks, arcs and dangerous temperatures are arranged on the first circuit board 30.

[0045] According to the technical solution of the present application, the first circuit board 30 is arranged in the explosion-proof cavity 11 of the housing 10, the first connecting plate 20 is arranged at the opening 12 of the housing 10, and the first circuit board 30 is fixed on the connecting plate 20, the detection assembly 40 includes a detection cavity 41 and a sensor body 42, the sensor body 42 is arranged in the detection cavity 41, and the detection assembly 40 is detachably arranged on the side of the connecting plate 20 away from the first circuit board 30. In this way, when the sensor body 42 needs to be replaced or repaired, it is only necessary to disassemble the detection assembly 40, and there is no need to disassemble the explosion-proof structure, which is convenient for the staff to replace and repair the sensor body 42, and reduces the work intensity of the staff. At the same time, in the prior art, when the staff removes the gas detector and opens the explosion-proof shell, it is very likely to damage the explosion-proof shell, or make mistakes when reassembling the gas detector, thereby affecting the explosion-proof effect of the explosion-proof shell. However, in the present application, it is not necessary to open the explosion-proof structure, so that the explosion-proof effect of the explosion-proof structure can be avoided from being affected by repeated disassembly, thereby ensuring the explosion-proof effect of the explosion-proof structure on the first circuit board 30.

[0046] Specifically, the main circuit is installed on the first circuit board 30. The first circuit board 30 meets the GB3836.4 intrinsic safety explosion-proof standard and is a Zener safety barrier circuit that plays the role of current and voltage limiting and provides safe input for the gas detector.

[0047] Furthermore, the connecting plate 20 and the housing 10 are detachably connected by the second locking member 72, and the first circuit board 30 and the connecting plate 20 are detachably connected by the third locking member 73. Such a configuration has a simple structure and is convenient for assembly. The second locking member 72 and the third locking member 73 are both bolts.

[0048] Among them, in the present application, there is a sealing ring 71 between the opening 12 of the shell 10 and the connecting plate 20. Such a configuration can improve the sealing effect between the shell 10 and the connecting plate 20, prevent external smoke and dust from entering the explosion-proof chamber 11, thereby preventing combustible mixed gases or flammable coal dust from accumulating on the first circuit board 30, thereby reducing the possibility of failure or even explosion of the first circuit board 30, improving the reliability of the gas detector, and at the same time making the gas detector adapt to the use requirements of underground coal mines and harsh environments.

[0049] Furthermore, the gas detector further includes a heat insulation structure 50, which is located between the first circuit board 30 and the connecting plate 20, and surrounds the periphery of the components 100 on the first circuit board 30. Such a configuration can prevent the first circuit board 30 from exploding due to heat, thereby reducing the possibility of failure or even explosion of the first circuit board 30, and improving the reliability of the gas detector.

[0050] Specifically, in the present application, the thermal insulation structure 50 is a glue-point foam, which has good sealing properties and can effectively prevent air penetration, thereby further reducing the possibility of flammable mixed gas or flammable coal dust accumulating on the first circuit board 30. At the same time, the glue-point foam has good elasticity and flexibility, thereby providing good shock absorption and buffering protection for the first circuit board 30, improving the service life of the first circuit board 30, and avoiding damage to the first circuit board 30. In addition, the glue-point foam is easy to process, which is convenient for the staff to process it into the required structure. In addition, one side of the glue-point foam is sticky, which is convenient for the staff to fix the thermal insulation structure 50 on the first circuit board 30.

[0051] The heat insulation structure 50 is sealed by glue filling. Such a configuration has a simple structure and is easy to operate. Meanwhile, the glue sealing cost is low, thereby reducing the processing cost of the gas detector.

[0052] Furthermore, the heat insulation structure 50 is sealed with epoxy resin glue, which meets the requirements of the national standard GB3836.2, and the epoxy resin glue has good electrical insulation performance and heat resistance, and can achieve the explosion-proof function while ensuring the normal operation of the first circuit board 30. With this arrangement, even if an explosion occurs inside the explosion-proof chamber 11, the flame accompanying the explosion will not spread to the designated explosion-proof area. Moreover, even if a combustible mixed gas or flammable coal dust enters the explosion-proof chamber 11, the epoxy resin glue and the glue-dispensing foam can cooperate to play an explosion-proof role and ensure the safety of underground operations. At the same time, there is no need to use special sealing materials to ensure the airtightness of the explosion-proof structure, thereby preventing explosions caused by deterioration of the sealing materials in advance.

[0053] Specifically, the detection component 40 also includes a base 43 and an upper cover 44. The base 43 is detachably connected to the connecting plate 20 via a first locking member 45. With such a configuration, it is convenient to disassemble and install the base 43, while ensuring the stability of the base 43 fixed on the connecting plate 20. The upper cover 44 is detachably covered on the outside of the base 43, and a detection chamber 41 is provided between the upper cover 44 and the base 43. A connecting port 441 is provided on the upper cover 44, and the connecting port 441 is connected to the detection chamber 41. With such a configuration, gas can enter the detection chamber 41 through the connecting port 441, and the sensor body 42 can monitor the gas in the detection chamber 41. The sensor body 42 can be replaced and repaired by removing the upper cover 44, and the structure is simple and easy to operate.

[0054] Among them, in the present application, a plurality of connecting ribs 442 are arranged circumferentially on the upper cover 44, and a connecting port 441 is provided between two adjacent connecting ribs 442. Such arrangement can ensure the smoothness of gas flow and thus ensure the sensitivity of monitoring.

[0055] Furthermore, a slot 22 is provided on one side of the connecting plate 20 away from the first circuit board 30 , and the base 43 is disposed in the slot 22 . This arrangement facilitates positioning of the base 43 , further reducing the difficulty of installing the base 43 .

[0056] Specifically, the connecting plate 20 is provided with a first wire hole 21, the base 43 is provided with a second wire hole, the detection assembly 40 further includes a second circuit board 48, the second circuit board 48 is provided on the base 43, the sensor body 42 is provided on the second circuit board 48, the second circuit board 48 is electrically connected to the sensor body 42, and the second circuit board 48 is electrically connected to the first circuit board 30 through the first wire hole 21 and the second wire hole. In this arrangement, the first circuit board 30 and the second circuit board 48 are connected through a wire, and the wire is passed through the first wire hole 21 and the second wire hole. In this arrangement, it is convenient to connect the first circuit board 30 and the second circuit board 48. Among them, the first circuit board 30 is electrically connected to the power line or the wire for transmitting information, and the second circuit board 48 controls the operation of the sensor body 42.

[0057] The detection component 40 further includes a fixed shell 46, which is disposed on the second circuit board 48, and a fixed cavity 461 is provided between the fixed shell 46 and the second circuit board 48, and the sensor body 42 is disposed in the fixed cavity 461, and a plurality of filter holes 462 are provided on the outer wall of the fixed shell 46, and the plurality of filter holes 462 can connect the fixed cavity 461 and the detection cavity 41. In this arrangement, the filter holes 462 can filter mosquitoes or large particles of dust, so that impurities can be prevented from contaminating the sensor body 42, thereby preventing the sensor body 42 from malfunctioning or generating false alarms, and thus ensuring the sensitivity of monitoring.

[0058] Optionally, a plurality of filter holes 462 may be provided in a partial area on the outer wall of the fixed shell 46 , or a plurality of filter holes 462 may be provided in a ring shape on the entire outer wall.

[0059] Furthermore, the fixed shell 46 includes a body and a cover body that are detachably connected, a fixed cavity 461 is provided between the body and the cover body, and a filter hole 462 is provided on the body.

[0060] Specifically, the sensor body 42 is arranged in the middle of the fixed cavity 461, and the inner wall of the fixed shell 46 is provided with a guide rib 463 to guide the gas to the sensor body 42. In this way, the guide rib 463 can guide the gas to the sensor body 42, which can further improve the monitoring sensitivity of the sensor body 42.

[0061] A plurality of guide ribs 463 are disposed on the inner wall of the fixed shell 46 , and the plurality of guide ribs 463 are disposed at annular intervals along the inner wall of the fixed shell 46 .

[0062] Specifically, the guide rib 463 includes a connecting section 4631 and an inclined section 4632 connected to each other, and an angle is formed between the extending direction of the connecting section 4631 and the radial direction of the fixed shell 46, so that more gas can be guided. One end of the inclined section 4632 is connected to the middle of the connecting section 4631, and the other end of the inclined section 4632 extends toward the middle of the fixed cavity 461, so that the gas can be guided to the sensor body 42.

[0063] Furthermore, the detection component 40 also includes an alarm 47, which is disposed on the second circuit board 48 and is electrically connected to the second circuit board 48. In this way, when the sensor body 42 detects gas anomalies, the alarm 47 can promptly alarm and notify the staff to handle the situation, thereby reducing the risk of safety accidents.

[0064] The housing 10 is provided with a connection hole 13, which is connected to the explosion-proof chamber 11, and a wire guide 60 is provided at the connection hole 13, which is used to electrically connect the wire to the second circuit board 48. This arrangement facilitates the electrical connection between the wire and the second circuit board 48, and the structure is simple.

[0065] Specifically, in the present application, the wire guide 60 is fixed to the connecting hole 13 by threading.

[0066] Furthermore, the wire guide 60 is a prior art, and the wire guide 60 has different protection levels, and the staff can choose it according to their own needs, which will not be elaborated here.

[0067] There is a buckle structure between the upper cover 44 and the base 43, and the upper cover 44 and the base 43 are detachably connected through the buckle structure. This arrangement makes it easy to disassemble the upper cover 44.

[0068] Optionally, a plurality of connecting grooves 443 may be provided on the side wall of the upper cover 44, and a plurality of connecting protrusions 431 may be provided on the side wall of the base 43. The plurality of connecting grooves 443 and the plurality of connecting protrusions 431 are provided in one-to-one correspondence, and the connecting grooves 443 and the connecting protrusions 431 cooperate to form a snap-fit ​​structure. When the staff rotates the upper cover 44, the connecting grooves 443 can be covered on the corresponding connecting protrusions 431, thereby completing the fixation of the upper cover 44 and the base 43.

[0069] Among them, the staff can choose the specific structure of the buckle structure according to needs.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0072] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0075] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas detector, characterized in that: The gas detector comprises: A housing (10), wherein the housing (10) has an explosion-proof cavity (11) and an opening (12) that are interconnected; A connecting plate (20) is detachably arranged at the opening (12), the connecting plate (20) is capable of blocking the opening (12), and the connecting plate (20) cooperates with the housing (10) to form an explosion-proof structure; A first circuit board (30) is fixed to a side of the connecting plate (20) close to the housing (10), and the first circuit board (30) is arranged in the explosion-proof cavity (11); A detection component (40) is detachably arranged on a side of the connecting plate (20) away from the housing (10), the detection component (40) comprising a detection cavity (41) and a sensor body (42), the sensor body (42) being located in the detection cavity (41), the sensor body (42) being used to detect gas, the sensor body (42) being electrically connected to the first circuit board (30), and the detection cavity (41) being independently arranged from the explosion-proof cavity (11).

2. The gas detector according to claim 1, characterized in that: The gas detector further comprises a heat insulation structure (50), wherein the heat insulation structure (50) is located between the first circuit board (30) and the connecting board (20), and the heat insulation structure (50) surrounds the periphery of the components (100) on the first circuit board (30).

3. The gas detector according to claim 2, characterized in that: The heat insulation structure (50) is sealed by glue filling.

4. The gas detector according to claim 1, characterized in that: The detection component (40) further comprises: A base (43), wherein the base (43) and the connecting plate (20) are detachably connected via a first locking member (45); An upper cover (44) is detachably arranged on the outer side of the base (43); a detection cavity (41) is provided between the upper cover (44) and the base (43); a communication port (441) is provided on the upper cover (44); and the communication port (441) is connected to the detection cavity (41).

5. The gas detector according to claim 4, characterized in that: The connecting plate (20) is provided with a first wire passing hole (21), the base (43) is provided with a second wire passing hole, the detection component (40) further comprises a second circuit board (48), the second circuit board (48) is provided on the base (43), the sensor body (42) is provided on the second circuit board (48), the second circuit board (48) is electrically connected to the sensor body (42), and the second circuit board (48) is electrically connected to the first circuit board (30) via the first wire passing hole (21) and the second wire passing hole.

6. The gas detector according to claim 5, characterized in that: The detection component (40) further comprises a fixed shell (46), wherein the fixed shell (46) is arranged on the second circuit board (48), a fixed cavity (461) is provided between the fixed shell (46) and the second circuit board (48), the sensor body (42) is arranged in the fixed cavity (461), and a plurality of filter holes (462) are provided on the outer wall of the fixed shell (46), and the plurality of filter holes (462) can connect the fixed cavity (461) and the detection cavity (41).

7. The gas detector according to claim 6, characterized in that: The sensor body (42) is arranged in the middle of the fixed cavity (461), and the inner wall of the fixed shell (46) is provided with guide ribs (463) to guide the gas to the sensor body (42).

8. The gas detector according to claim 5, characterized in that: The detection component (40) further comprises an alarm (47), wherein the alarm (47) is arranged on the second circuit board (48), and the alarm (47) is electrically connected to the second circuit board (48).

9. The gas detector according to claim 5, characterized in that: The shell (10) is provided with a connection hole (13), the connection hole (13) is in communication with the explosion-proof chamber (11), and a wire guide (60) is provided at the connection hole (13), the wire guide (60) is used to electrically connect a wire to the second circuit board (48).

10. The gas detector according to claim 4, characterized in that: A buckle structure is provided between the upper cover (44) and the base (43), and the upper cover (44) and the base (43) are detachably connected via the buckle structure.

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