Methanol detector

Abstract

The methanol detector comprises a protective shell and a detection head, the detection head comprises a main body, a support and a tail end which are connected in sequence, and the detection head is matched with the protective shell in an inserted mode so that the main body can be matched with a first opening end in a sealed mode; wherein a main body cavity is formed in the main body, and a through opening is formed in the main body, so that the main body cavity is communicated with the detection cavity. The methanol detector further comprises a transmitting assembly and a sealing assembly which are arranged in the main body cavity, the sealing assembly comprises a light-transmitting piece, and the light-transmitting piece is arranged on the through opening in a sealing and covering mode. The reflection assembly is arranged at the tail end to receive the optical signal sent by the transmitting end and reflect the optical signal to the receiving end. According to the methanol detector, the sealing assembly is arranged between the transmitting assembly and the detection cavity, so that a circuit system of the transmitting assembly is completely isolated from the methanol gas in the detection cavity, the influence of the methanol gas on the circuit system of the transmitting assembly is avoided, normal and stable work of the transmitting assembly is ensured, and the detection precision of the methanol detector is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detectors, and in particular to a methanol detector. BACKGROUND

[0002] The methanol detector is a precision device for detecting the concentration of methanol, which is usually arranged in some areas where the concentration of methanol may exceed the standard, such as some industrial use scenarios.

[0003] At present, in the field of ships, in order to cater to the development of the concept of green energy saving, power ships using methanol fuel are widely used. Methanol engines use methanol as fuel, and methanol is a flammable and explosive gas after volatilization. The safety problem in the process of use and storage cannot be ignored.

[0004] Therefore, the corresponding position of the related ship is usually configured with a methanol detector to strictly monitor the concentration of methanol. The methanol detector on the ship is different from the consumer sensor. The working condition of the methanol detector for the ship is very complex, such as high and low temperature change, vibration, salt spray corrosion, etc. It is necessary to design a methanol detector that can maintain detection accuracy in harsh working conditions.

[0005] SUMMARY

[0006] The present application provides a methanol detector to ensure that the methanol detector can still maintain good detection performance in harsh application conditions.

[0007] A methanol detector has a first direction, comprising:

[0008] A protective shell has a detection cavity through along the first direction, and a first open end and a second open end at both ends of the first direction; a detection head includes a main body, a bracket and a tail end connected in sequence along the first direction, and the detection head is inserted and matched with the protective shell to seal the main body with the first open end; wherein a main body cavity is opened in the main body, and a through hole is opened on the main body to communicate the main body cavity with the detection cavity;

[0009] Further comprising: a transmitting assembly arranged in the main body cavity, including a transmitting end and a receiving end; a sealing assembly arranged in the main body cavity, located between the transmitting assembly and the through hole in the first direction, the sealing assembly including a light-transmitting sheet, and the light-transmitting sheet is sealed and covered on the through hole; and a reflecting assembly arranged in the tail end to receive the light signal emitted by the transmitting end and reflect it to the receiving end.

[0010] In the embodiment of the present application, the detection process is that the emission end of the emission assembly emits an optical signal, the optical signal passes through the light transmission sheet into the detection cavity, and is reflected back to the receiving end through the reflection assembly. The detection principle is that the detection cavity is filled with the methanol gas to be detected, and according to the Lambert-Beer law, the concentration of the methanol gas can be calculated by the energy attenuation degree of the optical signal of the emission end and the receiving end. In the scheme, the sealing assembly is arranged between the emission assembly and the detection cavity, which completely isolates the circuit system of the emission assembly from the methanol gas in the detection cavity, thereby reducing the entry of the methanol gas into the detection cavity, avoiding the influence of the methanol gas on the circuit system of the emission assembly, avoiding electrical failure, ensuring the normal and stable work of the emission assembly, and thus ensuring the detection accuracy of the methanol detector.

[0011] As one of the optional embodiments of the present application, the main body includes a barrel portion and a sealing head, the barrel portion is partially inserted into the first opening end, the barrel portion is bolted to the first opening end, and the sealing head is bolted to one end of the barrel portion away from the protective shell to seal the end of the barrel portion, and the sealing head and the barrel portion jointly form the main body cavity.

[0012] As one of the optional embodiments of the present application, the sealing assembly further includes a sealing ring, the sealing ring is arranged around the edge of the through opening, and the light transmission sheet is arranged on the side of the sealing ring away from the through opening and is crimped to the sealing ring along the first direction.

[0013] As one of the optional embodiments of the present application, the sealing assembly further includes a crimping sheet and a clasp spring, the crimping sheet is arranged on the side of the light transmission sheet away from the through opening, the clasp spring is arranged on the side of the crimping sheet away from the light transmission sheet, the inner side wall of the main body cavity is provided with a clamping groove, and the clasp spring is clamped and matched in the clamping groove.

[0014] In the embodiment of the present application, the crimping sheet is fixed through the clamping and matching of the clasp spring and the clamping groove, so that the clasp spring crimps the light transmission sheet through the crimping sheet, and finally the light transmission sheet crimps the sealing ring, the sealing between the light transmission sheet and the through opening is realized, the optical signal can pass through the light transmission sheet with high efficiency, and the gas in the detection cavity is blocked by the sealing ring and the light transmission sheet, so that the methanol gas in the detection cavity is prevented from entering the main body cavity, thereby ensuring the safety and accuracy of detection. Moreover, the clamping and matching of the clasp spring and the clamping groove is detachable, so that the installation and dismounting of the crimping sheet is more simple and convenient.

[0015] As one of the optional embodiments of the present application, the emission assembly further includes a first circuit board, the inner wall of the barrel portion is protrudingly provided with a first connecting portion, the first circuit board is bolted and connected to the first connecting portion, and the emission end and the receiving end are both arranged on the first circuit board.

[0016] As one of the optional embodiments of the present application, the emitting assembly further comprises a limiting seat, the limiting seat is fixedly arranged on the side of the crimping sheet away from the through opening and is located between the first circuit board and the crimping sheet, the limiting seat is provided with an emitting hole and a receiving hole, and the emitting end and the receiving end are respectively inserted and matched with the emitting hole and the receiving hole.

[0017] In the embodiment of the present application, since the use environment of the methanol detector is relatively harsh, the important influencing factors are external forces such as vibration and impact, the bolted fixing of the first circuit board and the first connecting part can realize stable and reliable connection and facilitate the disassembly and maintenance of the first circuit board. In addition, the emitting end and the receiving end are limited by the emitting hole and the receiving hole to ensure the positional stability of the emitting end and the receiving end during the working process, which makes the emitting end and the receiving end always in the accurate position when emitting or receiving light signals, thereby ensuring the accuracy of the methanol detector detection.

[0018] As one of the optional embodiments of the present application, the emitting assembly further comprises a heat dissipation block, the side of the limiting seat facing the crimping sheet is provided with a mounting groove, and the heat dissipation block is embedded in the mounting groove.

[0019] As one of the optional embodiments of the present application, the limiting seat is provided with a heat dissipation hole, and the heat dissipation hole is in communication with the mounting groove.

[0020] In the embodiment of the present application, the emitting end and the receiving end are usually laser emitters and receivers, and a large amount of heat will be generated during the detection work, which may cause damage in the emitting assembly and affect the detection precision. Therefore, the heat dissipation block and the heat dissipation hole can dissipate heat in time, thereby ensuring the performance of the emitting assembly and improving the detection precision.

[0021] As one of the optional embodiments of the present application, the emitting assembly further comprises a second circuit board, the inner wall of the sealing head is protrudingly provided with a second connecting part, the second circuit board is bolted on the second connecting part, the second circuit board is arranged on the side of the first circuit board away from the through opening, and the first circuit board is electrically connected with the second circuit board.

[0022] As one of the optional embodiments of the present application, a cover body is further included, the cover body covers the second opening end, the cover body is provided with a filtering hole, and the filtering hole is in communication with the detection cavity.

[0023] In the embodiment of the present application, the cover body can reduce the impurities such as dust, salt mist and water vapor entering the detection cavity, reduce the pollution of the detection cavity caused by the large particles entering the detection cavity, and thereby ensure the accuracy of the methanol detector in measuring in a humid, salt mist and dusty environment.

[0024] One of the above technical solutions has the following advantages or beneficial effects:

[0025] The detection process is that the emission end of the emission assembly emits an optical signal, the optical signal enters the detection cavity through the light transmission sheet, and returns to the receiving end through the reflection of the reflection assembly. The detection principle is that the detection cavity is filled with the methanol gas to be detected, and according to the Lambert-Beer law, the concentration of the methanol gas can be calculated through the energy attenuation degree of the optical signal of the emission end and the receiving end. In the scheme, the sealing assembly is arranged between the emission assembly and the detection cavity, which completely isolates the circuit system of the emission assembly from the methanol gas in the detection cavity, thereby reducing the entry of the methanol gas into the detection cavity, avoiding the influence of the methanol gas on the circuit system of the emission assembly, avoiding electrical failure, ensuring the normal and stable work of the emission assembly, and thus ensuring the detection precision of the methanol detector. BRIEF DESCRIPTION OF DRAWINGS

[0026] The technical scheme and other beneficial effects of the present application will become apparent from the following detailed description of the specific embodiments of the present application, combined with the accompanying drawings.

[0027] Figure 1 is the overall structure diagram of the methanol detector provided by the embodiment of the present application;

[0028] Figure 2 is the overall explosion structure diagram of the methanol detector provided by the embodiment of the present application;

[0029] Figure 3 is the overall explosion section view of the methanol detector provided by the embodiment of the present application;

[0030] Figure 4 is the section view mainly used to show the internal structure of the main cavity provided by the embodiment of the present application;

[0031] Figure 5 is another section view mainly used to show the internal structure of the main cavity provided by the embodiment of the present application;

[0032] Figure 6 is the explosion structure diagram of the emission assembly provided by the embodiment of the present application;

[0033] Figure 7 is the explosion structure diagram of the sealing assembly provided by the embodiment of the present application.

[0034] Fig. 1 is a protective shell; 10 is a detection cavity; 11 is a first open end; 12 is a second open end; 2 is a detection head; 21 is a main body; 210 is a main cavity; 200 is a through hole; 211 is a cylinder part; 2111 is a first connecting part; 212 is a sealing head; 2121 is a second connecting part; 22 is a support; 23 is a tail end; 24 is a connecting head; 241 is a channel;

[0035] 3, transmitting assembly; 31, first circuit board; 32, transmitting end; 33, receiving end; 34, second circuit board; 35, limiting seat; 351, transmitting hole; 352, receiving hole; 353, heat dissipation hole; 350, mounting groove; 36, heat dissipation block; 37, lens;

[0036] 4, sealing assembly; 41, light transmission sheet; 42, sealing ring; 43, pressure contact sheet; 44, clamping spring; 441, clamping groove;

[0037] 5, reflecting assembly;

[0038] 6, cover body; 60, filtering hole;

[0039] 7, connecting frame; 71, connecting ring sheet; 72, side plate;

[0040] 100, display;

[0041] X, first direction. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the term "and / or" in this paper is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the front and rear associated objects without special explanation.

[0044] The following will be described in detail with reference to the drawings in the embodiments of the present application. Figures 1-7 Further description will be made for the present application.

[0045] Reference will be made to Figures 1-3 A methanol detector is provided in the present application, which has a first direction X. The methanol detector comprises a display 100, a detection head 2 and a protective shell 1 arranged in sequence along the first direction X.

[0046] The detection head 2 is used to detect the concentration of methanol; the display 100 is mechanically fixedly connected with the detection head 2, and the display 100 also has an electrical connection with the detection head 2. The display 100 is mechanically fixed with the detection head 2, can receive and process the electrical signal of the detection head 2, and display; the protective shell 1 is arranged outside the detection head 2 to protect the detection head 2.

[0047] Specifically, the detection head 2 is provided with a connecting head 24 at one end of the display 100 in the first direction X, and the display 100 is bolted to the connecting head 24. In other alternative embodiments, the display 100 can also be welded to the connecting head 24.

[0048] The methanol detector further comprises a connecting frame 7 for connecting and fixing the detection head 2 to an external carrier. Specifically, the connecting frame 7 comprises a connecting ring 71 and a side plate 72, the connecting ring 71 is screw-fixed to the detection head 2, and the side plate 72 is provided with a hole for fixing connection with the carrier.

[0049] The protective shell 1 has a detection cavity 10 extending along the first direction X, and a first open end 11 and a second open end 12 at both ends of the first direction X. The cover 6 is integrally connected at the position of the second open end 12, and the cover 6 is arranged on the second open end 12. The cover 6 is provided with a filter hole 60, and the filter hole 60 is in communication with the detection cavity 10. The cover 6 can reduce the impurities of dust, salt mist and water vapor entering the detection cavity 10, and reduce the pollution of the detection cavity 10 caused by the entry of large particles into the detection cavity 10, thereby ensuring the accuracy of the methanol detector in measuring in a humid, salt mist and dusty environment.

[0050] The detection head 2 and the protective shell 1 are further described below.

[0051] Referring to Figures 3-6 , the detection head 2 comprises a main body 21, a bracket 22 and a tail end 23 connected in sequence along the first direction X. The detection head 2 is inserted and fitted with the protective shell 1, so that the main body 21 is sealingly fitted with the first open end 11. The main body 21 is provided with a main body 21 cavity, and the main body 21 is provided with a through hole 200 to communicate the main body 21 cavity with the detection cavity 10.

[0052] Referring to Figures 4-6 , the detection head 2 further comprises a transmitting assembly 3, a sealing assembly 4 and a reflecting assembly 5. The transmitting assembly 3 and the sealing assembly 4 are arranged in the main body 21 cavity. The transmitting assembly 3 comprises a transmitting end 32 and a receiving end 33. In the first direction X, the sealing assembly 4 is located between the transmitting assembly 3 and the through hole 200, and the sealing assembly 4 comprises a light-transmitting sheet 41 sealingly arranged on the through hole 200. The reflecting assembly 5 is arranged on the tail end 23 to receive the light signal emitted by the transmitting end 32 and reflect it to the receiving end 33. In one example, the reflecting assembly 5 is a mirror.

[0053] In the embodiment of the present application, the detection process is that the emitting end 32 of the emitting assembly 3 emits light signals, the light signals pass through the light-transmitting sheet 41 into the detection cavity 10, and are reflected back to the receiving end 33 through the reflecting assembly 5. The detection principle is that the detection cavity 10 is filled with the methanol gas to be detected, and according to the Lambert-Beer law, the concentration of the methanol gas can be calculated according to the energy attenuation degree of the light signals of the emitting end 32 and the receiving end 33. In the present scheme, the sealing assembly 4 is arranged between the emitting assembly 3 and the detection cavity 10, which makes the circuit system of the emitting assembly 3 completely isolated from the methanol gas in the detection cavity 10, thereby reducing the methanol gas entering the detection cavity 10, and avoiding the influence of the methanol gas on the circuit system of the emitting assembly 3, avoiding electrical failure, ensuring the normal and stable work of the emitting assembly 3, and thus ensuring the detection precision of the methanol detector.

[0054] With reference to Figure 3 and Figure 5 More specifically, with respect to the body 21.

[0055] The body 21 comprises a barrel portion 211 and a sealing head 212, the barrel portion 211 is partially inserted into the first open end 11, and the barrel portion 211 is bolted to the first open end 11. In one example, the barrel portion 211 is designed as a cylinder, the top end of the protective shell 1 is provided with a matching groove, and the bottom end of the barrel portion 211 is designed as a stepped structure, so that the two are embedded with each other, and the outer side wall of the protective shell 1 is provided with a screw penetrating through the axis itself, which is used for screwing the barrel portion 211 to the protective shell 1.

[0056] The sealing head 212 is bolted to the end of the barrel portion 211 away from the protective shell 1 to seal the end of the barrel portion 211, and the sealing head 212 and the barrel portion 211 jointly form a cavity of the body 21. The end of the sealing head 212 away from the barrel portion 211 is integrally provided with the above-mentioned connecting head 24. The connecting head 24 is provided with a channel 241 communicating with the cavity of the body 21, so as to arrange the circuit connection.

[0057] The connection relationship between the connecting frame 7 and the detection head 2 is further introduced here. The connecting ring sheet 71 is attached to the top end of the barrel portion 211, the sealing head 212 is crimped on the top surface of the barrel portion 211, and then the sealing head 212, the connecting ring sheet 71 and the barrel portion 211 are fixedly connected through the screw.

[0058] In the embodiment of the present application, the connection structure of the barrel portion 211 and the protective shell 1 can realize the detachable design of the body 21 and the protective shell, which makes the detection head 2 and the protective shell 1 also detachable, and facilitates the installation and disassembly and maintenance. It should be noted that the connection of the barrel portion 211 and the protective shell 1 can also be fixed by welding.

[0059] With reference to Figure 5 and Figure 7As one of the optional embodiments of the present application, the sealing assembly 4 further comprises a sealing ring 42, a pressing piece 43 and a snap spring 44. The sealing ring 42 is arranged around the edge of the through hole 200, the light-transmitting sheet 41 is arranged on the side of the sealing ring 42 away from the through hole 200 and presses the sealing ring 42 in the first direction X, the pressing piece 43 is arranged on the side of the light-transmitting sheet 41 away from the through hole 200, the snap spring 44 is arranged on the side of the pressing piece 43 away from the light-transmitting sheet 41, and the inner side wall of the cavity of the main body 21 is provided with a clamping groove 441, and the snap spring 44 is clamped in the clamping groove 441.

[0060] In the embodiment of the present application, the pressing piece 43 is fixed by the clamping cooperation of the snap spring 44 and the clamping groove 441, so that the snap spring 44 presses the light-transmitting sheet 41 through the pressing piece 43, and finally the light-transmitting sheet 41 presses the sealing ring 42, realizing the sealing between the light-transmitting sheet 41 and the through hole 200. The light signal can pass through the light-transmitting sheet 41 with high efficiency, and the gas in the detection cavity 10 is blocked by the sealing ring 42 and the light-transmitting sheet 41, avoiding the methanol gas in the detection cavity 10 from entering the cavity of the main body 21, thereby ensuring the safety and accuracy of detection. Moreover, the cooperation of the snap spring 44 and the clamping groove 441 is detachable, which makes the installation and disassembly of the pressing piece 43 more simple and convenient.

[0061] Referring to Figure 5 and Figure 6 As one of the optional embodiments of the present application, the transmitting assembly 3 further comprises a first circuit board 31 and a limiting seat 35. The first circuit board 31 is arranged on the side of the snap spring 44 away from the pressing piece 43, and the first circuit board 31 is fixedly connected to the inner wall of the barrel portion 211. Specifically, the inner wall of the barrel portion 211 is provided with a first connecting portion 2111 protruding, and the first circuit board 31 is bolted and fixed to the first connecting portion 2111. The transmitting end 32 and the receiving end 33 are arranged on the first circuit board 31. In one optional example, the transmitting end 32 is configured as a laser transmitter, and the receiving end 33 is a laser receiver. When the light signal is laser, its performance is more stable, less susceptible to external interference, and the detection accuracy is higher.

[0062] The limiting seat 35 is fixedly arranged on the side of the pressing piece 43 away from the through hole 200 and located between the first circuit board 31 and the pressing piece 43. The limiting seat 35 is provided with a transmitting hole 351 and a receiving hole 352, and the transmitting end 32 and the receiving end 33 are respectively inserted and matched with the transmitting hole 351 and the receiving hole 352.

[0063] In the embodiment of the present application, since the use environment of the methanol detector is relatively harsh, the important influencing factors are external forces such as vibration and impact. The bolted connection of the first circuit board 31 and the first connecting portion 2111 can realize stable and reliable connection and facilitate the disassembly and maintenance of the first circuit board 31. In addition, the transmitting end 32 and the receiving end 33 are limited by the transmitting hole 351 and the receiving hole 352, which ensures the positional stability of the transmitting end 32 and the receiving end 33 during the working process. This makes the transmitting end 32 and the receiving end 33 always in the accurate position when transmitting or receiving light signals, thereby ensuring the accuracy of the methanol detector.

[0064] The lens 37 is arranged in the transmitting hole 351 and is arranged on the side of the transmitting end 32 away from the first circuit board 31. The lens 37 can focus and strengthen the light signal output intensity of the transmitting end 32, thereby reducing energy loss.

[0065] As one of the optional embodiments of the present application, the transmitting assembly 3 further comprises a heat dissipation block 36. The side of the limiting seat 35 facing the crimping sheet 43 is provided with a mounting groove 350, and the heat dissipation block 36 is embedded in the mounting groove 350. The limiting seat 35 is provided with a heat dissipation hole 353, which is in communication with the mounting groove 350.

[0066] Specifically, the heat dissipation block 36 is a TEC (Thermo Electric Cooler), i.e., a thermoelectric cooler, which can dissipate heat more efficiently. In other optional embodiments, the heat dissipation block 36 can also adopt a structure for physical heat dissipation by using material properties, such as a metal sheet. The purpose of the heat dissipation hole 353 is to enable heat to be discharged outwardly through the mounting seat for rapid heat dissipation. Alternatively, when the temperature is low, the heat dissipation hole 353 can also discharge the heat generated by the transmitting end 32 and the receiving end 33 to the vicinity of the first circuit board 31, so that the circuit system can work normally.

[0067] In the embodiment of the present application, the transmitting end 32 and the receiving end 33 are usually laser transmitters and receivers. During the detection work, the transmitting end 32 and the receiving end 33 will generate a lot of heat, which may cause damage in the transmitting assembly 3 and affect the detection precision. Therefore, the heat dissipation block 36 and the heat dissipation hole 353 can dissipate heat in time, thereby ensuring the performance of the transmitting assembly 3 and improving the detection precision.

[0068] As one of the optional embodiments of the present application, the transmitting assembly 3 further comprises a second circuit board 34, which is fixedly arranged in the sealing head 212. Specifically, the inner wall of the sealing head 212 is provided with a second connecting portion 2121, and the second circuit board 34 is bolted to the second connecting portion 2121. The second circuit board 34 is arranged on the side of the first circuit board 31 away from the opening 200, and the first circuit board 31 is electrically connected to the second circuit board 34.

[0069] The above merely provides part of the embodiments of the present application, and does not limit the present application in any form. The protection scope of the embodiments of the present application is not limited to this, and any person skilled in the art can easily think of simple modifications, equivalent changes and modifications within the technical range disclosed by the embodiments of the present application, which should be covered in the protection scope of the embodiments of the present application.

Claims

1. A methanol detector, characterized by, Having a first direction (X), comprising: A protective shell (1) having a detection cavity (10) through along the first direction (X), and a first open end (11) and a second open end (12) located at both ends of the first direction (X); A probe head (2) comprising a main body (21), a support (22) and a tail end (23) connected in turn along the first direction (X), the probe head (2) is inserted into the protective shell (1) so that the main body (21) is sealed with the first open end (11); Wherein, the main body (21) is provided with a main body (21) cavity, and the main body (21) is provided with a through hole (200) to communicate the main body (21) cavity with the detection cavity (10); Further comprising: An emission assembly (3) arranged in the main body (21) cavity, comprising an emission end (32) and a receiving end (33); A sealing assembly (4) arranged in the main body (21) cavity, the sealing assembly (4) is located between the emission assembly (3) and the through hole (200) in the first direction (X), the sealing assembly (4) comprises a light transmission sheet (41), and the light transmission sheet (41) is sealingly arranged on the through hole (200); and A reflection assembly (5) arranged in the tail end (23) to receive the light signal emitted by the emission end (32) and reflect it to the receiving end (33).

2. The methanol detector of claim 1, wherein, The main body (21) comprises a barrel portion (211) and a sealing head (212), the barrel portion (211) is partially inserted into the first open end (11), the barrel portion (211) is bolted to the first open end (11), the sealing head (212) is bolted to one end of the barrel portion (211) away from the protective shell (1) to seal the end of the barrel portion (211), and the sealing head (212) and the barrel portion (211) form the main body (21) cavity.

3. The methanol detector of claim 2, wherein, The sealing assembly (4) further comprises a sealing ring (42), the sealing ring (42) is arranged around the edge of the through hole (200), and the light transmission sheet (41) is arranged on the side of the sealing ring (42) away from the through hole (200) and is pressed against the sealing ring (42) along the first direction (X).

4. The methanol detector of claim 3, wherein, The sealing assembly (4) further comprises a pressing sheet (43) and a snap spring (44), the pressing sheet (43) is arranged on the side of the light transmission sheet (41) away from the through hole (200), the snap spring (44) is arranged on the side of the pressing sheet (43) away from the light transmission sheet (41), and the inner wall of the main body (21) cavity is provided with a clamping groove (441), and the snap spring (44) is clamped and matched in the clamping groove (441).

5. The methanol detector of claim 4, wherein, The emission assembly (3) further comprises a first circuit board (31), the inner wall of the barrel portion (211) is protrudingly provided with a first connecting portion (2111), the first circuit board (31) is bolted and connected to the first connecting portion (2111), and the emission end (32) and the receiving end (33) are arranged on the first circuit board (31).

6. The methanol detector of claim 5, wherein, The transmitting assembly (3) further comprises a limiting seat (35) fixedly arranged on the side of the crimping sheet (43) away from the through hole (200) and located between the first circuit board (31) and the crimping sheet (43), the limiting seat (35) is provided with a transmitting hole (351) and a receiving hole (352), and the transmitting end (32) and the receiving end (33) are respectively inserted into the transmitting hole (351) and the receiving hole (352).

7. The methanol detector of claim 6, wherein, The transmitting assembly (3) further comprises a heat dissipation block (36), and one side of the limiting seat (35) towards the crimping sheet (43) is provided with a mounting groove (350), and the heat dissipation block (36) is embedded in the mounting groove (350).

8. The methanol detector of claim 7, wherein, The limiting seat (35) is provided with a heat dissipation hole (353), and the heat dissipation hole (353) is in communication with the mounting groove (350).

9. The methanol sensor of claim 5, wherein, The transmitting assembly (3) further comprises a second circuit board (34), the inner wall of the sealing head (212) is provided with a second connecting part (2121), the second circuit board (34) is bolted on the second connecting part (2121), the second circuit board (34) is arranged on the side of the first circuit board (31) away from the through hole (200), and the first circuit board (31) is electrically connected with the second circuit board (34).

10. The methanol sensor of claim 1, wherein, Further comprising a cover body (6), the cover body (6) covers the second opening end (12), the cover body (6) is provided with a filtering hole (60), and the filtering hole (60) is in communication with the detection cavity (10).

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