Flame detection device

Abstract

The utility model provides a flame detection device which comprises a sight glass unit which comprises a supporting assembly, a first light-transmitting mirror and a second light-transmitting mirror, the supporting assembly is provided with a communicating hole in a penetrating mode, the two light-transmitting mirrors are installed in the communicating hole in a spaced mode, and a sealing cavity is defined by the two light-transmitting mirrors and the inner wall of the communicating hole; the first end of the root valve is detachably connected with the supporting assembly; the first end of the connecting flange is detachably connected with the second end of the root valve, the second end of the connecting flange is connected with a flame detection channel of the ignition burner, and a first light path channel is formed in the connecting flange in a penetrating mode; the detection unit is connected with the end, away from the root valve, of the supporting assembly through a connecting piece, and the connecting piece is provided with a second light path channel in a penetrating mode; a first gas injection channel and a second gas injection channel which communicate with each other are formed in the supporting assembly, the first gas injection channel communicates with the sealing cavity, and the second gas injection channel extends to the end face of the end, facing the root valve, of the supporting assembly. The gas storage box is communicated with the first gas injection channel through a gas conveying pipe, and a flow meter is mounted on the gas conveying pipe.

Description

Technical Field

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

[0002] During the combustion process of the gasifier, if the flame goes out unexpectedly, the fuel supply must be cut off urgently. If the fuel continues to be added, a large amount of high-pressure and high-temperature mixed combustible gas will accumulate inside the furnace, which may easily trigger serious accidents such as explosions. Therefore, it is necessary to use a flame detector to monitor the combustion situation in the furnace at any time. When the flame detector detects that the flame is extinguished, it outputs a corresponding signal to the automatic control system so that the fuel supply can be cut off in time to avoid accidents. The sight glass of the flame detector often directly contacts the gas in the furnace, and dust and water are easily accumulated on the surface of the sight glass. Dust and water accumulation may affect the detection results of the flame detector. In severe cases, the flame detector cannot detect the signal and causes the system to jump. To ensure the accuracy of the detection, the sight glass of the flame detector needs to be cleaned frequently.

[0003] Existing flame detectors use a flange to directly fasten the sight glass. To achieve a sealing effect, sealant is usually applied around the sight glass and then fixed with pads. When dust and water accumulate on the surface of the sight glass and need to be cleaned, the sealant around the glass needs to be scraped off and the glass needs to be pried out before cleaning. In this process, the sight glass often breaks. When the sight glass is cleaned and reinstalled, it needs to be re-sealed with glue. After the glue solidifies, an airtight test is required to prevent leakage. Uneven force on the sight glass during installation often leads to glass breakage. The disassembly and cleaning process of the sight glass of the entire flame detector is time-consuming and labor-intensive, with a high probability of glass breakage and a high risk of gas leakage in the gasifier. Utility Model Content

[0004] In view of this, the utility model provides a flame detection device to solve the above technical problems.

[0005] The flame detection device provided by the utility model comprises:

[0006] A mirror unit, the mirror unit comprising a support assembly, a first light-transmitting mirror and a second light-transmitting mirror, the support assembly having a connecting hole, the first light-transmitting mirror and the second light-transmitting mirror being installed in the connecting hole at intervals, the first light-transmitting mirror, the second light-transmitting mirror and the inner wall of the connecting hole enclosing a sealed cavity;

[0007] a root valve, a first end of the root valve being detachably connected to the support assembly;

[0008] A connecting flange, wherein the first end of the connecting flange is detachably connected to the second end of the root valve, the second end of the connecting flange is connected to the fire detection channel of the ignition burner, and the connecting flange is penetrated by a first optical path channel;

[0009] A detection unit, wherein the detection unit is connected to an end of the support assembly away from the root valve through a connecting piece, the connecting piece is penetrated by a second optical path, and the first optical path, the root valve, the connecting hole and the second optical path are coaxially arranged;

[0010] A first gas injection channel and a second gas injection channel are connected in the support component, the first gas injection channel is connected to the sealing cavity, and the second gas injection channel extends to an end surface of the support component facing the root valve;

[0011] An air storage box is connected to the first air injection channel through an air delivery pipe, and a flow meter is installed on the air delivery pipe.

[0012] Optionally, the support assembly includes a base, a support seat and a pressure cover which are stacked in sequence and detachably connected, the base is connected to the root valve, and the pressure cover is connected to the connecting piece.

[0013] Optionally, a first mounting groove is provided on a side surface of the base facing the support seat, a second mounting groove is provided on a side surface of the support seat facing the base, a third mounting groove is provided on a side surface of the support seat facing the pressure cover, and a fourth mounting groove is provided on a side surface of the pressure cover facing the support seat, the first mounting groove, the second mounting groove, the third mounting groove and the fourth mounting groove are coaxially arranged with the connecting hole, the first light-transmitting mirror is arranged in the first mounting groove and the second mounting groove, and the second light-transmitting mirror is arranged in the third mounting groove and the fourth mounting groove.

[0014] Optionally, a first annular groove is formed at the bottom of the first mounting groove, the first annular groove is coaxially arranged with the communicating hole, and a first sealing ring is arranged in the first annular groove.

[0015] Optionally, a second annular groove is formed at the bottom of the second mounting groove, the second annular groove is coaxially arranged with the connecting hole, and a second sealing ring is arranged in the second annular groove.

[0016] Optionally, a third annular groove is formed at the bottom of the third mounting groove, the third annular groove is coaxially arranged with the connecting hole, and a third sealing ring is arranged in the third annular groove.

[0017] Optionally, a fourth annular groove is formed at the bottom of the fourth mounting groove, the fourth annular groove is coaxially arranged with the connecting hole, and a fourth sealing ring is arranged in the fourth annular groove.

[0018] Optionally, a fifth annular groove is correspondingly formed on a surface of the root valve opposite to the support assembly, the fifth annular groove is coaxially arranged with the communicating hole, and a fifth sealing ring is arranged in the fifth annular groove.

[0019] Optionally, first mounting holes are respectively provided on the base, the support seat and the pressure cover, and a first fastener passes through each of the first mounting holes in sequence to achieve a detachable connection among the base, the support seat and the pressure cover.

[0020] Optionally, second mounting holes are respectively provided on the base and the root valve, and a second fastener passes through each of the second mounting holes to achieve a detachable connection between the base and the root valve.

[0021] Compared with the prior art, the above technical solution provided by the utility model has at least the following beneficial effects:

[0022] With the flame detection device of the utility model, when dust and water accumulate on the light mirror causing inaccurate detection results of the detection unit, the root valve is closed to cut off the connection between the gas in the gasifier and the sight glass unit to prevent gas leakage, the sight glass unit and the root valve are disassembled, and a new sight glass unit is replaced. The sight glass unit is an integrated sealing structure, and there is no need to disassemble the internal light mirror separately. The light mirror will not be damaged during the disassembly and assembly process. In addition, the new sight glass unit has completed the sealing test in the factory, and there is no need to test the sealing performance on site before installation, which saves operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A cross-sectional view of a flame detection device according to an embodiment of the utility model;

[0024] Figure 2 for Figure 1 A cross-sectional top view of a support assembly of the flame detection device is shown.

[0025] Reference numerals:

[0026] 1: sight glass unit; 101: support assembly; 1011: connecting hole; 1012: first gas injection channel; 1013: second gas injection channel; 1014: base; 1015: support seat; 1016: pressure cover; 102: first light-transmitting mirror; 103: second light-transmitting mirror; 2: root valve; 3: connecting flange; 301: first light path channel; 4: detection unit; 5: fire detection channel; 6: connecting piece; 601: second light path channel; 7: first sealing ring; 8: second sealing ring; 9: third sealing ring; 10: fourth sealing ring; 11: fifth sealing ring; 12: first mounting hole; 13: second mounting hole. DETAILED DESCRIPTION

[0027] The embodiments of the utility model will be further described below in conjunction with the accompanying drawings. In the description of the utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only a simplified description for the convenience of describing the utility model, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0028] Figure 1 This is a cross-sectional view of a flame detection device according to an embodiment of the utility model. Figure 2 for Figure 1 A sectional top view of the support assembly of the flame detection device shown. Figure 1 and Figure 2 As shown, the flame detection device includes a mirror unit 1, a root valve 2, a connecting flange 3, a detection unit 4 and a gas storage box (not shown). The mirror unit 1 includes a support assembly 101, a first light-transmitting mirror 102 and a second light-transmitting mirror 103. The support assembly 101 is provided with a connecting hole 1011. The first light-transmitting mirror 102 and the second light-transmitting mirror 103 are installed in the connecting hole 1011 at intervals. The first light-transmitting mirror 102, the second light-transmitting mirror 103 and the inner wall of the connecting hole 1011 enclose a sealed cavity; the first end of the root valve 2 is detachably connected to the support assembly 101; the first end of the connecting flange 3 is detachably connected to the second end of the root valve 2, the second end of the connecting flange 3 is connected to the flame detection channel 5 of the ignition burner, and the connecting flange 3 is provided with a first optical path channel 301; The detection unit 4 is connected to the end of the support component 101 away from the root valve 2 through the connecting piece 6, and the connecting piece 6 is provided with a second optical path channel 601, and the first optical path channel 301, the root valve 2, the connecting hole 1011 and the second optical path channel 601 are coaxially arranged; a first gas injection channel 1012 and a second gas injection channel 1013 are connected to each other in the support component 101, the first gas injection channel 1012 is connected to the sealing cavity, and the second gas injection channel 1013 extends to an end face of the support component 101 facing the root valve 2; the gas storage box is connected to the first gas injection channel 1012 through a gas supply pipe, and a flow meter (not shown) is installed on the gas supply pipe.

[0029] The sight glass unit 1 is a whole, which is produced in the factory and undergoes an airtightness test in the factory to ensure the airtightness between the first light-transmitting mirror 102 and the second light-transmitting mirror 103 and the support assembly 101, and no air leakage occurs. When in use, the two ends of the connecting flange 3 are respectively connected to the fire detection channel 5 and the root valve 2 of the ignition burner, the support assembly 101 of the sight glass unit 1 is connected to the root valve 2, and the detection unit 4 is connected to the support assembly 101 through the connecting piece 6. The ignition burner extends into the gasifier and is connected to the gasifier. During the operation of the gasifier, the root valve 2 is opened, and the detection unit 4 detects the flame combustion in the gasifier through the optical path channel formed by the coaxial arrangement of the connecting piece 6, the support assembly 101, the first light-transmitting mirror 102, the second light-transmitting mirror 103, the root valve 2, the connecting flange 3 and the fire detection channel 5 of the ignition burner. The detection unit 4 is connected to the controller in communication, and the controller determines whether the flame is burning according to the data detected by the detection unit 4. When dust and water accumulate on the first light-transmitting mirror 102 or the second light-transmitting mirror 103 and affect normal detection, close the root valve 2, and the gas in the gasifier will be blocked by the root valve 2 and will not continue to overflow to the light-transmitting mirror. Then, disassemble the support assembly 101 and the root valve 2, disassemble the support assembly 101 and the connecting piece 6, and the mirror unit 1 will be restored to an independent individual. Replace the new mirror unit 1, connect the new mirror unit 1 to the root valve 2 and the connecting piece 6 respectively, open the root valve 2 again, and the detection unit 4 will re-detect the flame combustion condition in the gasifier. The air tightness of the sight glass unit 1 has been tested in the factory. In order to prevent air leakage during use, the first air injection channel 1012 is connected to the air storage box through an air pipe. The air storage box stores inert gas, such as nitrogen. The pressure of the inert gas is slightly greater than the pressure of the gas in the gasifier. During the use of the device, based on the pressure difference, the inert gas in the air storage box is transported to the first air injection channel 1012 and the second air injection channel 1013 through the air pipe. When the pressure is balanced, the transportation is stopped. If air leakage occurs due to poor air tightness, such as air leakage at the contact surface between the first light-transmitting mirror 102 and the second light-transmitting mirror 103 and the support assembly 101, or air leakage at the contact surface between the support assembly 101 and the root valve 2, the inert gas in the air storage box will continue to be transported. At this time, the gas flow monitored by the flowmeter exceeds the preset value, indicating that there is air leakage due to poor air tightness. At this time, the operator needs to replace the sight glass unit 1.

[0030] By adopting the flame detection device of the utility model, when dust and water accumulate on the light mirror causing inaccurate detection result of the detection unit 4, the root valve 2 is closed to cut off the connection between the gas in the gasifier and the sight glass unit 1 to prevent gas leakage, the sight glass unit 1 and the root valve 2 are disassembled, and a new sight glass unit 1 is replaced. The sight glass unit 1 is an integrated sealing structure, and there is no need to disassemble the internal light mirror separately. The light mirror will not be damaged during the disassembly and assembly process. In addition, the new sight glass unit 1 has completed the sealing test in the factory, and there is no need to test the sealing performance on site before installation, which saves operation time.

[0031] like Figure 1 As shown, in this embodiment, the lower end of the connecting flange 3 is connected to the fire detection channel 5 of the ignition burner, and the upper end is connected to the root valve 2, the upper end of the root valve 2 is connected to the support assembly 101, the first light-transmitting mirror 102 and the second light-transmitting mirror 103 are arranged horizontally in the support assembly 101 at intervals, the connecting member 6 uses a ball valve, the lower end of the ball valve is connected to the upper end of the support assembly 101, and the upper end of the ball valve is connected to the detection unit 4, and the detection unit 4, the connecting member 6, the support assembly 101, the first light-transmitting mirror 102, the second light-transmitting mirror 103, the root valve 2, the connecting flange 3 and the fire detection channel 5 are coaxially arranged to facilitate light transmission. The first light-transmitting mirror 102 and the second light-transmitting mirror 103 are made of quartz glass, which has high hardness, high pressure resistance, low expansion coefficient, high temperature resistance, and high chemical stability. The first gas injection channel 1012 is arranged horizontally, that is, perpendicular to the connecting hole 1011 in the support assembly 101. The second gas injection channel 1013 is perpendicular to the first gas injection channel 1012 and extends downward to the bottom end surface of the support assembly 101, that is, extends to the contact surface between the support assembly 101 and the root valve 2. When the seal is not tight, the inert gas leaks from here. In the initial operation of the device, the gas storage box can also form a purge wind to purge the sealed cavity between the first light-transmitting mirror 102 and the second light-transmitting mirror 103 during the process of conveying inert gas to the sealed cavity, thereby cooling and cleaning the light-transmitting mirror and the optical path. The detection unit 4 can be any detection mechanism that can detect the combustion state of the flame, such as an infrared detection mechanism, an ultraviolet detection mechanism, and an image detection mechanism. In order to notify the operator as soon as possible when there is a gas leak, the flow meter can also be connected to the external control unit for communication, and the control unit can be connected to the alarm for communication. A flow threshold is pre-stored inside the control unit, and the flow threshold corresponds to the inert gas filling the sealed cavity enclosed by the first light-transmitting mirror 102, the second light-transmitting mirror 103 and the inner wall of the support assembly 101, and the inert gas flow filling the first gas injection channel 1012, the second gas injection channel 1013 and the gas pipe. The flow meter transmits the monitored flow value to the control unit in real time. When the flow value exceeds the flow threshold, it indicates that the airtightness is not tight and there is a gas leak. At this time, the control unit controls the alarm to sound an alarm to prompt the operator to replace the mirror unit 1 as soon as possible.

[0032] Optionally, the support assembly 101 includes a base 1014, a support seat 1015 and a gland 1016 which are sequentially stacked and detachably connected, the base 1014 is connected to the root valve 2, and the gland 1016 is connected to the connector 6. The support assembly 101 is configured as a plurality of detachably connected components, which facilitates the installation and removal of the first light-transmitting mirror 102 and the second light-transmitting mirror 103.

[0033] like Figure 1As shown, in this embodiment, the base 1014, the support base 1015 and the pressure cover 1016 are longitudinally stacked and coaxially arranged, and the axes of the three pass through the through holes respectively, and together form a connecting hole 1011. The cross-sectional diameters of the support base 1015 and the pressure cover 1016 are the same, and the cross-sectional diameter of the base 1014 is larger than the cross-sectional diameters of the support base 1015 and the pressure cover 1016. The first light-transmitting mirror 102 is installed between the base 1014 and the support base 1015, and the second light-transmitting mirror 103 is installed between the support base 1015 and the pressure cover 1016. The first gas injection channel 1012 is horizontally opened in the support base 1015 and extends to the end face of the support base 1015. The second gas injection channel 1013 vertically passes through the support base 1015 and the base 1014 and extends to the bottom end face of the base 1014. In this embodiment, the base 1014, the support base 1015 and the pressure cover 1016 are all forged from alloy materials. According to the actual application, the shapes and sizes of the base 1014, the support base 1015 and the pressure cover 1016 can be adjusted.

[0034] Optionally, a first mounting groove is provided on a side surface of the base 1014 facing the support base 1015, a second mounting groove is provided on a side surface of the support base 1015 facing the base 1014, a third mounting groove is provided on a side surface of the support base 1015 facing the pressure cover 1016, and a fourth mounting groove is provided on a side surface of the pressure cover 1016 facing the support base 1015. The first mounting groove, the second mounting groove, the third mounting groove, and the fourth mounting groove are coaxially arranged with the connecting hole 1011, and the first light-transmitting mirror 102 is arranged in the first mounting groove and the second mounting groove, and the second light-transmitting mirror 103 is arranged in the third mounting groove and the fourth mounting groove. In this arrangement, the first light-transmitting mirror 102 and the second light-transmitting mirror 103 are respectively arranged in the mounting grooves at corresponding positions, so that the installation process of the two light-transmitting mirrors is convenient, which is conducive to improving assembly efficiency.

[0035] like Figure 1 As shown, the upper surface of the base 1014 is coaxially provided with a first mounting groove with the connecting hole 1011, the lower surface of the support seat 1015 is coaxially provided with a second mounting groove with the connecting hole 1011, the upper surface of the support seat 1015 is coaxially provided with a third mounting groove with the connecting hole 1011, and the lower surface of the pressure cover 1016 is coaxially provided with a fourth mounting groove with the connecting hole 1011, and each mounting groove is processed by a lathe. The first light-transmitting mirror 102 is installed in the installation space enclosed by the first mounting groove and the second mounting groove, and the second light-transmitting mirror 103 is installed in the installation space enclosed by the third mounting groove and the fourth mounting groove. When the view mirror unit 1 is replaced, the first light-transmitting mirror 102 and the second light-transmitting mirror 103 can be disassembled from the support assembly 101 for separate cleaning, so as to facilitate reuse. The sizes of the light-transmitting mirrors and the components match, the force is small and uniform, and it is not easy to be damaged during the disassembly process.

[0036] Optionally, a first annular groove is provided at the bottom of the first installation groove, the first annular groove is coaxially arranged with the communicating hole 1011, and a first sealing ring 7 is arranged in the first annular groove. In this arrangement, the first sealing ring 7 is arranged between the first light-transmitting mirror 102 and the base 1014 to seal the two. If there is leakage at the contact surface between the two between the communicating hole 1011 and the first annular groove, the gas is blocked by the first sealing ring 7 to prevent the gas in the gasifier from overflowing through the contact surface between the first light-transmitting mirror 102 and the base 1014.

[0037] like Figure 1 As shown, in this embodiment, the first annular groove is set in a closed annular shape and is coaxially arranged with the connecting hole 1011. The outer diameter of the first annular groove is larger than the diameter of the connecting hole 1011 and smaller than the outer diameter of the first light-transmitting mirror 102. The first sealing ring 7 is matched and arranged in the first annular groove, and a graphite packing sealing ring is selected.

[0038] Optionally, a second annular groove is provided at the bottom of the second mounting groove, the second annular groove is coaxially arranged with the communicating hole 1011, and a second sealing ring 8 is arranged in the second annular groove. In this arrangement, the second sealing ring 8 is arranged between the first light-transmitting mirror 102 and the supporting seat 1015 to seal the two. If there is leakage at the contact surface between the two between the communicating hole 1011 and the second annular groove, the gas is blocked by the second sealing ring 8 to prevent the gas in the gasifier from overflowing through the contact surface between the first light-transmitting mirror 102 and the supporting seat 1015.

[0039] like Figure 1 As shown, in this embodiment, the second annular groove is set in a closed circular ring shape and is coaxially arranged with the connecting hole 1011. The outer diameter of the second annular groove is larger than the diameter of the connecting hole 1011 and smaller than the outer diameter of the first light-transmitting mirror 102. The second sealing ring 8 is matched and arranged in the second annular groove, and a graphite packing sealing ring is selected.

[0040] Optionally, a third annular groove is provided at the bottom of the third installation groove, the third annular groove is coaxially arranged with the connecting hole 1011, and a third sealing ring 9 is arranged in the third annular groove. In this arrangement, the third sealing ring 9 is arranged between the second light-transmitting mirror 103 and the support seat 1015 to seal the two. If there is a gas leak at the contact surface between the two between the connecting hole 1011 and the third annular groove, the gas is blocked by the third sealing ring 9 to prevent the gas in the gasifier from overflowing through the contact surface between the second light-transmitting mirror 103 and the support seat 1015.

[0041] like Figure 1As shown, in this embodiment, the third annular groove is set in a closed circular ring shape and is coaxially arranged with the connecting hole 1011. The outer diameter of the third annular groove is larger than the diameter of the connecting hole 1011 and smaller than the outer diameter of the second light-transmitting mirror 103. The third sealing ring 9 is matched and arranged in the third annular groove, and a graphite packing sealing ring is selected.

[0042] Optionally, a fourth annular groove is provided at the bottom of the fourth installation groove, the fourth annular groove is coaxially arranged with the connecting hole 1011, and a fourth sealing ring 10 is arranged in the fourth annular groove. In this arrangement, the fourth sealing ring 10 is arranged between the second light-transmitting mirror 103 and the pressure cover 1016 to seal the two. If there is a gas leak at the contact surface between the two between the connecting hole 1011 and the fourth annular groove, the gas is blocked by the fourth sealing ring 10 to prevent the gas in the gasifier from overflowing through the contact surface between the second light-transmitting mirror 103 and the pressure cover 1016.

[0043] like Figure 1 As shown, in this embodiment, the fourth annular groove is set in a closed circular ring shape and is coaxially arranged with the connecting hole 1011. The outer diameter of the fourth annular groove is larger than the diameter of the connecting hole 1011 and smaller than the outer diameter of the second light-transmitting mirror 103. The fourth sealing ring 10 is matched and arranged in the fourth annular groove, and a graphite packing sealing ring is selected.

[0044] When assembling the mirror unit 1, first install the first sealing ring 7 in the first annular groove on the base 1014, then install the first light-transmitting mirror 102 in the first installation groove, then install the second sealing ring 8 in the second annular groove on the support seat 1015, then align the second installation groove on the support seat 1015 coaxially with the first light-transmitting mirror 102 and press down, and cooperate with the base 1014 to fix the first light-transmitting mirror 102, install the third sealing ring 9 in the third annular groove on the support seat 1015, install the second light-transmitting mirror 103 in the third installation groove, then install the fourth sealing ring 10 in the fourth annular groove on the pressure cover 1016, align the fourth installation groove on the pressure cover 1016 coaxially with the second light-transmitting mirror 103 and press down, and cooperate with the support seat 1015 to fix the second light-transmitting mirror 103.

[0045] Optionally, a fifth annular groove is correspondingly provided on the surface of the side opposite to the support assembly 101 of the root valve 2, the fifth annular groove is coaxially arranged with the connecting hole 1011, and a fifth sealing ring 11 is arranged in the fifth annular groove. In this arrangement, the fifth sealing ring 11 is arranged between the root valve 2 and the support assembly 101 to seal the two. If there is a gas leak on the contact surface between the two between the connecting hole 1011 and the fifth annular groove, the gas is blocked by the fifth sealing ring 11 to prevent the gas in the gasifier from overflowing through the contact surface between the root valve 2 and the support assembly 101.

[0046] like Figure 1As shown, in this embodiment, the fifth annular groove is set in a closed circular ring shape, which is respectively opened on the top end surface of the root valve 2 and the bottom end surface of the base 1014, and is coaxially arranged with the connecting hole 1011. The outer diameter of the fifth annular groove is larger than the outer diameter of the first light-transmitting mirror 102 and smaller than the outer diameter of the support seat 1015. The second gas injection channel 1013 is located between the connecting hole 1011 and the fifth annular groove. The fifth sealing ring 11 is matched and arranged in the fifth annular groove, and a graphite packing sealing ring is selected.

[0047] Optionally, the base 1014, the support base 1015 and the gland 1016 are respectively provided with first mounting holes 12, and the first fasteners sequentially pass through the first mounting holes 12 to achieve detachable connection of the base 1014, the support base 1015 and the gland 1016. The detachable connection of the base 1014, the support base 1015 and the gland 1016 is achieved by the fasteners cooperating with the mounting holes, which simplifies the connection between the three and helps to improve assembly efficiency.

[0048] like Figure 2 As shown, in the present embodiment, six first mounting holes 12 are equidistantly provided in the circumference of the base 1014, the support seat 1015 and the pressure cover 1016, and six first fasteners pass through the six corresponding first mounting holes 12 respectively to realize the connection between the base 1014, the support seat 1015 and the pressure cover 1016. Specifically, the first mounting hole 12 is provided with an internal thread, and the first fastener is a bolt, and the two are threadedly connected.

[0049] Optionally, the base 1014 and the root valve 2 are respectively provided with second mounting holes 13, and the second fasteners pass through the second mounting holes 13 to achieve a detachable connection between the base 1014 and the root valve 2. The detachable connection between the base 1014 and the root valve 2 is achieved by means of the fasteners cooperating with the mounting holes, which simplifies the connection between the two and is conducive to improving assembly efficiency.

[0050] like Figure 2 As shown, in this embodiment, six second mounting holes 13 are equally spaced in the circumferential direction near the periphery of the base 1014. Correspondingly, six second mounting holes 13 are also opened at corresponding positions of the root valve 2. The six second fasteners pass through the six corresponding second mounting holes 13 respectively to achieve the connection between the base 1014 and the root valve 2. Specifically, the second mounting hole 13 is provided with an internal thread, and the second fastener is a bolt, and the two are threadedly connected.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A flame detection device, characterized in that: include: A mirror unit, the mirror unit comprising a support assembly, a first light-transmitting mirror and a second light-transmitting mirror, the support assembly having a connecting hole, the first light-transmitting mirror and the second light-transmitting mirror being installed in the connecting hole at intervals, the first light-transmitting mirror, the second light-transmitting mirror and the inner wall of the connecting hole enclosing a sealed cavity; a root valve, a first end of the root valve being detachably connected to the support assembly; A connecting flange, wherein the first end of the connecting flange is detachably connected to the second end of the root valve, the second end of the connecting flange is connected to the fire detection channel of the ignition burner, and the connecting flange is penetrated by a first optical path channel; A detection unit, wherein the detection unit is connected to an end of the support assembly away from the root valve through a connecting piece, the connecting piece is penetrated by a second optical path, and the first optical path, the root valve, the connecting hole and the second optical path are coaxially arranged; A first gas injection channel and a second gas injection channel are connected in the support component, the first gas injection channel is connected to the sealing cavity, and the second gas injection channel extends to an end surface of the support component facing the root valve; An air storage box is connected to the first air injection channel through an air delivery pipe, and a flow meter is installed on the air delivery pipe.

2. The flame detection device according to claim 1, characterized in that: The support assembly comprises a base, a support seat and a pressure cover which are stacked in sequence and detachably connected. The base is connected to the root valve, and the pressure cover is connected to the connecting piece.

3. The flame detection device according to claim 2, characterized in that: A first mounting groove is provided on a side surface of the base facing the support seat, a second mounting groove is provided on a side surface of the support seat facing the base, a third mounting groove is provided on a side surface of the support seat facing the pressure cover, and a fourth mounting groove is provided on a side surface of the pressure cover facing the support seat. The first mounting groove, the second mounting groove, the third mounting groove and the fourth mounting groove are coaxially arranged with the connecting hole, the first light-transmitting mirror is arranged in the first mounting groove and the second mounting groove, and the second light-transmitting mirror is arranged in the third mounting groove and the fourth mounting groove.

4. The flame detection device according to claim 3, characterized in that: A first annular groove is formed at the bottom of the first mounting groove. The first annular groove is coaxially arranged with the communicating hole. A first sealing ring is arranged in the first annular groove.

5. The flame detection device according to claim 3 or 4, characterized in that: A second annular groove is formed at the bottom of the second mounting groove. The second annular groove is coaxially arranged with the communicating hole. A second sealing ring is arranged in the second annular groove.

6. The flame detection device according to claim 3 or 4, characterized in that: A third annular groove is formed at the bottom of the third installation groove. The third annular groove is coaxially arranged with the communicating hole. A third sealing ring is arranged in the third annular groove.

7. The flame detection device according to claim 3 or 4, characterized in that: A fourth annular groove is formed at the bottom of the fourth mounting groove. The fourth annular groove is coaxially arranged with the communicating hole. A fourth sealing ring is arranged in the fourth annular groove.

8. The flame detection device according to any one of claims 1 to 4, characterized in that: A fifth annular groove is correspondingly formed on a surface of the root valve opposite to the support assembly. The fifth annular groove is coaxially arranged with the communicating hole, and a fifth sealing ring is arranged in the fifth annular groove.

9. The flame detection device according to any one of claims 2 to 4, characterized in that: The base, the support base and the pressure cover are respectively provided with first mounting holes, and the first fastener passes through the first mounting holes in sequence to achieve detachable connection between the base, the support base and the pressure cover.

10. The flame detection device according to any one of claims 2 to 4, characterized in that: The base and the root valve are respectively provided with second mounting holes, and second fasteners pass through the second mounting holes to achieve detachable connection between the base and the root valve.

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