Flame detector

Abstract

The embodiment of the utility model discloses a flame detector. The flame detector comprises a glass window assembly, a first pressing ring of the glass window assembly is fixedly provided with a glass window, and the circumferential outer side of the first pressing ring is provided with a first external thread; then, a front shell assembly of the flame detector comprises a first circumferential wall, and a first internal thread is arranged on the circumferential inner side of the first circumferential wall; thus, the detachable threaded combination surface is formed between the circumferential outer side of the first pressing ring of the glass window assembly and the circumferential inner side of the first circumferential wall of the front shell assembly, the glass window assembly is detachably installed on the front shell assembly of the flame detector on the premise that the anti-explosion requirement is met, and therefore when the glass window needs to be replaced, the glass window assembly can be replaced conveniently. When the glass window is replaced, the front shell assembly only needs to be detached, then the glass window assembly is detached from the front shell assembly and replaced, the front shell assembly and the glass window do not need to be replaced together, and cost is saved.

Description

Technical Field

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

[0002] Flame detectors, also known as photosensitive fire detectors, respond to the optical characteristics of fires, specifically the intensity of light and the frequency of flame flickering. Flame detectors typically consist of a detector housing, which houses a detection board with a photosensor. The housing also includes a glass window for the photosensor to detect.

[0003] In related solutions, the glass window of the flame detector is usually fixed to the detector housing by gluing, for example, it is fixed to the front shell by gluing. Although this fixing method can meet the explosion-proof requirements, considering that the flame detector needs to replace the glass window due to the high temperature, wind and sand and other environments in which it works, it is usually necessary to replace the glass window together with the front shell, which causes unnecessary waste. Utility Model Content

[0004] In response to at least one aspect of the above-mentioned technical problems, an embodiment of the present application provides a flame detector, which includes a glass window assembly, a first pressure ring of the glass window assembly is fixedly installed with a glass window, and a first external thread is provided on the circumferential outer side of the first pressure ring; then, the front shell assembly of the flame detector includes a first circumferential wall, and a first internal thread is provided on the circumferential inner side of the first circumferential wall; in this way, the first external thread on the circumferential outer side of the first pressure ring is detachably threaded and installed on the first internal thread on the circumferential inner side of the first circumferential wall; that is, in this embodiment, a detachable threaded joint surface is formed between the circumferential outer side of the first pressure ring of the glass window assembly and the circumferential inner side of the first circumferential wall of the front shell assembly, so that the glass window assembly can be detachably installed on the front shell assembly of the flame detector while meeting the explosion-proof requirements. In this way, when the glass window needs to be replaced, it is only necessary to remove the front shell assembly, and then remove and replace the glass window assembly from the front shell assembly, without having to replace the front shell assembly and the glass window together, thereby saving costs.

[0005] The present invention provides a flame detector, comprising:

[0006] A front housing assembly and a main housing assembly detachably mounted along a first direction, the front housing assembly comprising a first circumferential wall extending along the first direction, one end of the first circumferential wall being provided with a first window opening, the other end of the first circumferential wall being adapted to be detachably connected to the main housing assembly;

[0007] A glass window assembly comprises a first pressure ring and a glass window fixedly mounted on the first pressure ring;

[0008] A first flange is extended radially inwardly from one end of the first circumferential wall, so that the first annular flange forms the first viewing window opening;

[0009] The first circumferential wall is provided with a first internal thread on the circumferential inner side near the first flange position, and the first pressure ring is provided with a first external thread on the circumferential outer side, so that the circumferential outer side of the first pressure ring and the circumferential inner side of the first circumferential wall are detachably threadedly mounted, and the first pressure ring is used to abut against the inner side of the first flange.

[0010] In one embodiment, preferably, the first pressure ring includes a second circumferential wall extending along the first direction, and a second flange extends radially inwardly from one end of the second circumferential wall toward the first flange, so that the annular second flange is used to abut against the glass window;

[0011] The glass window assembly further includes a second pressure ring provided on a side of the glass window facing away from the second flange;

[0012] The circumferential outer side of the second pressure ring is provided with a second external thread, and the circumferential inner side of the second circumferential wall corresponding to the position of the second pressure ring is provided with a second internal thread, so that the circumferential outer side of the second pressure ring and the circumferential inner side of the first pressure ring are detachably threadedly mounted.

[0013] In one embodiment, preferably, along the first direction, the second flange is provided with a sealant between the annular projection area of ​​the glass window and the second flange, so as to form an annular bonding surface between the glass window and the second flange.

[0014] In one embodiment, preferably, a pair of first notches are provided on the annular end surface of the second circumferential wall facing away from the second flange, and the first notches are used for a disassembly tool to screw the first pressure ring into or out of the front housing assembly; and / or,

[0015] A pair of second notches is provided on the annular end surface of the second pressing ring facing away from the second flange. The second notches are used for a disassembly tool to screw the second pressing ring into or out of the first pressing ring.

[0016] In one embodiment, preferably, a sealing ring is provided between the first flange and the second flange.

[0017] In one embodiment, preferably, an annular sealing ring groove is provided on the surface of the first flange facing the second flange, and the sealing ring groove is used for installing the sealing ring.

[0018] In one embodiment, preferably, the second annular flange forms a second viewing window opening, wherein a diameter of the second viewing window opening is not smaller than a diameter of the first viewing window opening.

[0019] In one embodiment, preferably, the main housing assembly includes a middle housing assembly and a rear housing assembly that are detachably mounted along the first direction, the front housing assembly is mounted on one end of the middle housing assembly via a threaded structure, and the rear housing assembly is mounted on the other end of the middle housing assembly via a threaded structure;

[0020] The flame detector further comprises a detection plate and a wiring board arranged inside the middle shell assembly;

[0021] The detection board is electrically connected to the wiring board, and a light-sensitive sensor is provided on a side of the detection board facing the first window opening.

[0022] In one embodiment, preferably, a sunshade is provided at the top end of the middle shell component, and a wall-mounted bracket is connected to the bottom end of the middle shell component.

[0023] In one embodiment, preferably, a pair of wire threading openings are provided at the bottom end of the middle shell assembly, the wire threading openings are used for allowing cables connected to the terminal block to extend out, and the cables are plugged into the wire threading openings through flameproof connectors.

[0024] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0025] An embodiment of the present application provides a flame detector, which includes a glass window assembly, wherein the glass window assembly includes a first pressure ring and a glass window fixed to the first pressure ring, and the circumferential outer side of the first pressure ring is provided with a first external thread; then, the flame detector also includes a detachable front shell assembly and a main shell assembly, and the circumferential inner side of the first circumferential wall of the front shell assembly is provided with a first internal thread; in this way, the glass window assembly of this embodiment is detachably installed on the first circumferential wall, that is, the front shell assembly, through the first external thread on the circumferential outer side of the first pressure ring; when the glass window needs to be replaced, it is only necessary to disassemble the front shell assembly and the main shell assembly first, and then disassemble and replace the glass window assembly from the front shell assembly, without having to replace the front shell assembly together, thereby saving costs.

[0026] That is to say, this embodiment provides a threaded joint surface between the circumferential outer side of the glass window assembly (specifically the first pressure ring) and the circumferential inner side of the front shell assembly (specifically the first circumferential wall). In this way, on the one hand, the installation of the glass window assembly and the front shell assembly can meet the explosion-proof requirements, and on the other hand, the glass window assembly and the front shell assembly can be detachably installed. Therefore, when replacing the glass window, only the glass window assembly needs to be replaced, and the front shell assembly does not need to be replaced together. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 Schematic diagram of the structure of the flame detector described in the embodiment of this application.

[0029] Figure 2 Schematic diagram of the explosion structure of the flame detector described in the embodiment of this application.

[0030] Figure 3 Schematic diagram of the exploded structure of the glass window assembly described in the embodiment of the present application.

[0031] Figure 4 This is a side sectional structural schematic diagram of the glass window assembly installed on the front shell assembly in the embodiment of the present application.

[0032] Wherein, the reference numerals:

[0033] 10-Front shell assembly,

[0034] 11-first circumferential wall, 12-first window opening, 13-first flange,

[0035] 20-Main housing assembly,

[0036] 21-middle shell assembly, 22-rear shell assembly, 23-detection board, 24-connection board, 25-sun shield, 26-wall mounting bracket, 27-threading hole, 28-plug,

[0037] 30-Glass window assembly,

[0038] 31-first pressure ring, 32-second pressure ring, 33-glass window,

[0039] 311 - second circumferential wall, 312 - second flange, 313 - second window opening, 314 - first notch,

[0040] 321-Second gap,

[0041] 40-sealing ring,

[0042] 50-threaded joint surface,

[0043] 60-bonding surface,

[0044] X - first direction. DETAILED DESCRIPTION

[0045] In order to better understand the above technical solutions, example embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited to the exemplary embodiments described herein.

[0046] Please combine Figures 1 to 4 A flame detector includes a front shell assembly 10 and a main shell assembly 20 that can be detachably installed along a first direction X. The front shell assembly 10 includes a first circumferential wall 11 extending along the first direction X. One end of the first circumferential wall 11 is provided with a first window opening 12, and the other end of the first circumferential wall 11 is used to be detachably connected to the main shell assembly 20.

[0047] The flame detector further includes a glass window assembly 30 , which includes a first pressure ring 31 and a glass window 33 fixedly mounted on the first pressure ring 31 .

[0048] Among them, a first flange 13 is extended in a radially inward direction at one end of the first circumferential wall 11, so that the annular first flange 13 forms a first window opening 12; the first circumferential wall 11 is provided with a first internal thread on the circumferential inner side near the first flange 13, and the first pressure ring 31 is provided with a first external thread on the circumferential outer side, so that the circumferential outer side of the first pressure ring 31 and the circumferential inner side of the first circumferential wall 11 are detachably threadedly installed, and the first pressure ring 31 is used to abut against the inner side of the first flange 13.

[0049] In general, this embodiment provides a threaded joint surface 50 between the circumferential outer side of the glass window assembly and the circumferential inner side of the front shell assembly, so that the installation of the glass window assembly and the front shell assembly can meet both explosion-proof requirements and detachable requirements.

[0050] Specifically, the flame detector of this embodiment includes a front shell assembly and a main shell assembly, and the front shell assembly and the main shell assembly are detachably installed along a first direction.

[0051] It can be understood that the accommodating space between the front shell assembly and the main shell assembly is used to install a detection board, on which a photosensor is provided. Then, the front shell assembly is usually provided with a first window opening, which is used for detection by the photosensor, wherein a glass window is usually used to be installed in the first window opening and close the first window opening.

[0052] In the existing solution, the glass window is usually fixed directly to the first window opening of the front shell assembly by dispensing glue. In this way, when the glass window needs to be replaced, since the glass window and the front shell assembly are fixed as a whole, the front shell assembly and the glass window need to be replaced together, causing unnecessary waste.

[0053] In this embodiment, the flame detector further includes a glass window assembly, which includes a first pressure ring and a glass window, wherein the glass window is fixedly mounted on the first pressure ring; it can be understood that here, the fixed installation of the glass window and the first pressure ring is preferably able to meet explosion-proof requirements.

[0054] In this embodiment, a first external thread is provided on the circumferential outer side of the first pressure ring.

[0055] In which, the front shell assembly of this embodiment includes a first circumferential wall extending along a first direction, and one end of the first circumferential wall has a first flange extending in a radially inward direction, so that the annular first flange forms the first window opening mentioned above, and then, the other end of the first circumferential wall is used for detachable installation on the main shell assembly.

[0056] In addition, the first circumferential wall is provided with a first internal thread on the circumferential inner side near the first flange position. In this way, it can be understood that a detachable threaded installation is formed between the circumferential outer side of the first pressure ring and the circumferential inner side of the first circumferential wall; in other words, an annular threaded joint surface 50 is formed between the glass window assembly and the front shell assembly. The threaded joint surface 50 can, on the one hand, make the installation between the glass window assembly and the front shell assembly meet the explosion-proof requirements, and on the other hand, make the installation between the glass window assembly and the front shell assembly meet the detachable requirements.

[0057] In addition, the first internal thread of the first circumferential wall should be arranged near the first flange, so that when the glass window assembly is threadedly installed on the front shell assembly, the first pressure ring can abut against the inner side of the first flange.

[0058] An embodiment of the present application provides a flame detector, which includes a glass window assembly, wherein the glass window assembly includes a first pressure ring and a glass window fixed to the first pressure ring, and the circumferential outer side of the first pressure ring is provided with a first external thread; then, the flame detector also includes a detachable front shell assembly and a main shell assembly, and the circumferential inner side of the first circumferential wall of the front shell assembly is provided with a first internal thread; in this way, the glass window assembly of this embodiment is detachably installed on the first circumferential wall, that is, the front shell assembly, through the first external thread on the circumferential outer side of the first pressure ring; when the glass window needs to be replaced, it is only necessary to disassemble the front shell assembly and the main shell assembly first, and then disassemble and replace the glass window assembly from the front shell assembly, without having to replace the front shell assembly together, thereby saving costs.

[0059] That is to say, this embodiment provides a threaded joint surface between the circumferential outer side of the glass window assembly (specifically the first pressure ring) and the circumferential inner side of the front shell assembly (specifically the first circumferential wall). In this way, on the one hand, the installation of the glass window assembly and the front shell assembly can meet the explosion-proof requirements, and on the other hand, the glass window assembly and the front shell assembly can be detachably installed. Therefore, when replacing the glass window, only the glass window assembly needs to be replaced, and the front shell assembly does not need to be replaced together.

[0060] Regarding the fixed installation of the above-mentioned glass window 33 and the first pressure ring 31, in one possible embodiment, the first pressure ring 31 includes a second circumferential wall 311 extending along the first direction X, and the second circumferential wall 311 has a second flange 312 extending radially inwardly at one end toward the first flange 13, so that the annular second flange 312 is used to abut against the glass window 33; the glass window assembly 30 also includes a second pressure ring 32 arranged on the side of the glass window 33 facing away from the second flange 312; wherein, the circumferential outer side of the second pressure ring 32 is provided with a second external thread, and the second circumferential wall 311 is provided with a second internal thread on the circumferential inner side corresponding to the position of the second pressure ring 32, so that the circumferential outer side of the second pressure ring 32 and the circumferential inner side of the first pressure ring 31 are detachably threadedly installed.

[0061] That is, similar to the threaded joint surface formed between the first pressure ring and the front shell assembly, this embodiment forms a threaded joint surface 50 between the first pressure ring and the second pressure ring of the glass window assembly, so that the fixed installation between the glass window and the first pressure ring meets the explosion-proof requirements.

[0062] Specifically, the first pressure ring includes a second circumferential wall extending along the first direction, and a second flange extends radially inwardly from one end of the second circumferential wall, so that the annular second flange can be used to abut against the glass window.

[0063] Then, on the side of the glass window facing away from the second flange, the glass window assembly also includes a second pressure ring, the circumferential outer side of the second pressure ring is provided with a second external thread, and the second circumferential wall (i.e., the first pressure ring) is provided with a second internal thread on the circumferential inner side corresponding to the position of the second pressure ring. In this way, the circumferential outer side of the second pressure ring and the circumferential inner side of the first pressure ring are detachable threaded installations.

[0064] It can be understood that for the glass window, one side thereof is abutted against the second flange radially inwardly extending from the first pressure ring, and the other side is abutted against the second pressure ring threadedly mounted with the first pressure ring. Moreover, since a threaded joint surface is also formed between the first pressure ring and the second pressure ring, the installation between the first pressure ring and the second pressure ring can meet both explosion-proof requirements and detachable requirements. In this way, when replacing the glass window assembly, only the glass window needs to be replaced, which further saves costs.

[0065] In one embodiment, along the first direction X, a sealant is provided on the second flange 312 between the annular projection area of ​​the glass window 33 and the second flange 312 , so as to form an annular bonding surface 60 between the glass window 33 and the second flange 312 .

[0066] That is, in order to improve the protection and sealing capabilities of the flame detector, this embodiment can specifically use a glue-dispensing method to fix the glass window and the second flange of the first pressure ring together. At this time, it can be understood that since the glass window and the first pressure ring are fixed together, when replacing, at least the first pressure ring and the glass window need to be replaced together.

[0067] Specifically, it can be understood that since the second flange is annular, this embodiment can specifically fix the second flange between the annular projection area of ​​the glass window and the second flange by dispensing glue, so that an annular bonding surface is formed between the glass window and the second flange, thereby achieving sealing between the glass window and the first pressure ring.

[0068] In a specific embodiment, a pair of first notches 314 are provided on the annular end surface of the second circumferential wall 311 facing away from the second flange 312, and the first notches 314 are used for a disassembly tool to screw the first pressure ring 31 into or out of the front shell assembly 10; and / or, a pair of second notches 321 are provided on the annular end surface of the second pressure ring 32 facing away from the second flange 312, and the second notches 321 are used for a disassembly tool to screw the second pressure ring 32 into or out of the first pressure ring 31.

[0069] That is, in order to facilitate the installation and disassembly between the first pressure ring and the front shell assembly, this embodiment can specifically set a first notch on the annular end surface of the second circumferential wall of the first pressure ring facing away from the second flange. The first notches are set in pairs, for example. In this way, the first pressure ring can be conveniently installed on the front shell assembly or disassembled from the front shell assembly using circlip pliers.

[0070] Similarly, in this embodiment, a second notch can be specifically provided on the annular end face of the second pressure ring facing away from the second flange. The second notches can be provided in pairs, for example. In this way, the second pressure ring can be conveniently installed on the first pressure ring or removed from the first pressure ring using circlip pliers.

[0071] In a specific embodiment, a sealing ring 40 is provided between the first flange 13 and the second flange 312 , and the sealing ring 40 can achieve sealing between the first pressure ring 31 and the front housing assembly 10 .

[0072] Specifically, an annular sealing ring groove is provided on the surface of the first flange 13 facing the second flange 312 , and the sealing ring groove is used for installing the sealing ring 40 .

[0073] In a specific embodiment, the annular second flange 312 forms a second viewing window opening 313 , wherein the diameter of the second viewing window opening 313 is not less than the diameter of the first viewing window opening 12 .

[0074] As mentioned above, similar to the first annular flange forming the first viewing window opening, the second annular flange forms the second viewing window opening, and the diameter of the second viewing window opening should not be smaller than the diameter of the first viewing window opening.

[0075] That is to say, relative to the radial direction of the front shell assembly, the second flange formed by the radial inward extension of the first pressure ring should be retracted into the first flange formed by the radial inward extension of the front shell assembly to prevent the second flange from blocking the first window opening of the front shell assembly.

[0076] In one possible embodiment, the main shell assembly 20 includes a middle shell assembly 21 and a rear shell assembly 22 that are detachably installed along the first direction X, the front shell assembly 10 is installed on one end of the middle shell assembly 21 through a threaded structure, and the rear shell assembly 22 is installed on the other end of the middle shell assembly 21 through a threaded structure; the flame detector also includes a detection plate 23 and a terminal block 24 arranged inside the middle shell assembly 21; wherein the detection plate 23 is electrically connected to the terminal block 24, and a photosensor is provided on the side of the detection plate 23 facing the first window opening 12.

[0077] Specifically, in the flame detector of this embodiment, the main shell assembly includes a middle shell assembly and a rear shell assembly, that is, one end of the middle shell assembly can be detachably installed with the front shell assembly, and the other end can be detachably installed with the rear shell assembly. In this way, the detachable installation of the front shell assembly relative to the middle shell assembly can facilitate the replacement of the glass window assembly, and the detachable installation of the rear shell assembly relative to the middle shell assembly can facilitate the wiring installation of the internal terminal board of the flame detector.

[0078] In a specific embodiment, a sunshade 25 is provided at the top of the middle shell component 21 , and a wall-mounted bracket 26 is connected to the bottom of the middle shell component 21 .

[0079] It can be understood that the sunshade should be arranged to protrude relative to the front shell assembly, and the wall-mounted bracket can realize the wall-mounting of the flame detector as a whole.

[0080] In one embodiment, a pair of wire threading openings 27 are provided at the bottom end of the middle shell assembly 21. The wire threading openings 27 are used for extending cables connected to the terminal block 24. The cables are plugged into the wire threading openings 27 through flameproof connectors.

[0081] Specifically, a pair of threading openings may be provided in the middle shell component, and the threading openings allow cables connected to the wiring board to pass through the middle shell component.

[0082] It can be understood that, on the one hand, the cable should be plugged into the threading opening through a flameproof connector to meet explosion-proof requirements, and on the other hand, the threading opening can be closed by a plug 28 when not in use.

[0083] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0084] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0085] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0086] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0087] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize that certain variations, modifications, alterations, additions, and sub-combinations thereof are intended to be within the scope of protection of the present invention.

Claims

1. A flame detector, characterized in that: The flame detector comprises: A front housing assembly and a main housing assembly detachably mounted along a first direction, the front housing assembly comprising a first circumferential wall extending along the first direction, one end of the first circumferential wall being provided with a first window opening, the other end of the first circumferential wall being adapted to be detachably connected to the main housing assembly; A glass window assembly comprises a first pressure ring and a glass window fixedly mounted on the first pressure ring; A first flange is extended radially inwardly from one end of the first circumferential wall, so that the first annular flange forms the first viewing window opening; The first circumferential wall is provided with a first internal thread on the circumferential inner side near the first flange position, and the first pressure ring is provided with a first external thread on the circumferential outer side, so that the circumferential outer side of the first pressure ring and the circumferential inner side of the first circumferential wall are detachably threadedly mounted, and the first pressure ring is used to abut against the inner side of the first flange.

2. The flame detector according to claim 1, characterized in that The first pressure ring includes a second circumferential wall extending along the first direction, and a second flange is extended radially inwardly from one end of the second circumferential wall toward the first flange, so that the annular second flange is used to abut against the glass window; The glass window assembly further includes a second pressure ring provided on a side of the glass window facing away from the second flange; The circumferential outer side of the second pressure ring is provided with a second external thread, and the circumferential inner side of the second circumferential wall corresponding to the position of the second pressure ring is provided with a second internal thread, so that the circumferential outer side of the second pressure ring and the circumferential inner side of the first pressure ring are detachably threadedly mounted.

3. The flame detector according to claim 2, characterized in that Along the first direction, a sealant is provided between the annular projection area of ​​the glass window and the second flange, so as to form an annular bonding surface between the glass window and the second flange.

4. The flame detector according to claim 2, characterized in that A pair of first notches is provided on the annular end surface of the second circumferential wall facing away from the second flange, wherein the first notches are used for a disassembly tool to screw the first pressure ring into or out of the front housing assembly; and / or, A pair of second notches is provided on the annular end surface of the second pressing ring facing away from the second flange. The second notches are used for a disassembly tool to screw the second pressing ring into or out of the first pressing ring.

5. The flame detector according to claim 2, characterized in that: A sealing ring is provided between the first flange and the second flange.

6. The flame detector according to claim 5, characterized in that: An annular sealing ring groove is provided on the surface of the first flange facing the second flange, and the sealing ring groove is used for installing the sealing ring.

7. The flame detector according to claim 2, characterized in that: The second annular flange forms a second viewing window opening, wherein a diameter of the second viewing window opening is not smaller than a diameter of the first viewing window opening.

8. The flame detector according to claim 1, characterized in that: The main housing assembly includes a middle housing assembly and a rear housing assembly that are detachably mounted along the first direction, the front housing assembly being mounted on one end of the middle housing assembly via a threaded structure, and the rear housing assembly being mounted on the other end of the middle housing assembly via a threaded structure; The flame detector further comprises a detection plate and a wiring board arranged inside the middle shell assembly; The detection board is electrically connected to the wiring board, and a light-sensitive sensor is provided on a side of the detection board facing the first window opening.

9. The flame detector according to claim 8, characterized in that: The top end of the middle shell component is provided with a sunshade, and the bottom end of the middle shell component is connected to a wall-mounted bracket.

10. The flame detector according to claim 8, characterized in that A pair of threading openings are provided at the bottom end of the middle shell component, and the threading openings are used for extending cables connected to the terminal block, and the cables are plugged into the threading openings through flameproof connectors.

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