Boiler flue gas detection device and detection method

Abstract

The invention discloses a boiler flue gas detection device and method, and relates to the technical field of flue gas detection.The boiler flue gas detection device comprises a connecting pipe, a guide pipe is arranged on the connecting pipe in a communicating mode, a sampling pipe is arranged on the guide pipe in a communicating mode, and an alarm lamp is installed on the side face of the sampling pipe; a first opening and a second opening are formed in the sampling pipe, mounting rings are mounted on the two sides of the inner walls of the first opening and the second opening, a baffle is arranged between every two adjacent mounting rings, a first connecting plate and a second connecting plate are arranged in the sampling pipe, a third opening is formed in the first connecting plate, and a fourth opening is formed in the second connecting plate; and a servo motor and a controller are mounted on the second connecting plate. The smoke detection device solves the problems that an existing smoke detection device cannot automatically turn off a subsequent sensor after one sensor detects that the concentration is too high, and cannot store part of smoke firstly and then convey and detect the smoke.

Description

Technical Field

[0001] This invention relates to the field of flue gas detection technology, specifically a boiler flue gas detection device and detection method. Background Technology

[0002] Boiler combustion typically relies on fuels such as coal, natural gas, and oil. These fuels release a large amount of heat during combustion, while also producing flue gas. Harmful substances in the fuel, such as sulfur, nitrogen, and carbon, react with oxygen to produce sulfur dioxide, nitrogen oxides, carbon dioxide, carbon monoxide, and particulate matter. This flue gas causes serious environmental pollution, affects air quality, and harms human health. To ensure efficient, environmentally friendly, and safe boiler operation, flue gas detection devices are necessary.

[0003] The invention patent with publication number CN119023915B discloses a device for detecting flue gas from municipal solid waste incineration. The device includes a mounting plate, which is installed on the flue via an adjustable clamping mechanism. The adjustable clamping mechanism includes a sliding rod fixedly connected to the left and right ends of the lower end face of the mounting plate. Connecting plates are slidably connected to both sides of the sliding rod. A bidirectional threaded rod is rotatably mounted on the mounting plate at both ends. A connecting block is fixedly connected to the lower end face of the connecting plate, and a clamping plate is slidably connected to one side of the lower end face of the connecting block. This device utilizes an adjustable covering mechanism to adjust the stretch of the covering cloth according to the flue's dimensions during short-term detection. This allows the covering cloth to intercept the flue gas to a greater extent, and then extract and detect the intercepted flue gas. This results in a more concentrated flow range for the flue gas, enabling faster collection of sufficient flue gas volume. While the aforementioned devices can intercept flue gas, they cannot arrange multiple detection sensors in layers within the sampling structure during use, nor can they automatically shut down subsequent sensors after one sensor detects an excessively high concentration, thus affecting the lifespan of the device. Furthermore, existing detection equipment is directly connected to an external flue gas filter duct, but the flue gas discharged from the duct is uneven, making it impossible to store a portion of the flue gas before delivery for detection. Continuous detection cannot guarantee the accuracy of flue gas detection, and traditional continuous sampling measures instantaneous values ​​with large fluctuations, which cannot represent the average concentration over a period of time. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of existing flue gas detection devices that cannot automatically shut down subsequent sensors after one sensor detects an excessively high concentration, and that cannot store a portion of the flue gas before sending it for detection, and to provide a boiler flue gas detection device and detection method.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a boiler flue gas detection device, comprising a connecting pipe, a guide pipe connected to the connecting pipe, a sampling pipe connected to the guide pipe, an alarm light mounted on the side of the sampling pipe, a first opening and a second opening on the sampling pipe, mounting rings mounted on both sides of the inner walls of the first and second openings, a baffle between adjacent mounting rings, a first connecting plate and a second connecting plate inside the sampling pipe, a third opening on the first connecting plate, a fourth opening on the second connecting plate, a servo motor and a controller mounted on the second connecting plate, a bidirectional screw fixedly connected to the output shaft of the servo motor, a first sliding plate threaded to the outer side of the bidirectional screw, a first fixing plate and a second fixing plate mounted on the second connecting plate, gas detection sensors mounted on both the first and second fixing plates, the controller electrically connected to the servo motor and the gas detection sensors, a first conductive plate on the second connecting plate, a second conductive plate on the alarm light, a buffer chamber and an air inlet assembly mounted on the connecting pipe, and a second pressure block between the buffer chamber and the air inlet assembly.

[0006] As a further embodiment of the present invention: the central axes of the connecting tube, the guide tube and the sampling tube are collinear, and the connecting tube, the guide tube and the sampling tube are interconnected.

[0007] As a further embodiment of the present invention: the baffles are evenly distributed on the sampling tube, and the baffles and the sampling tube are rotatably connected.

[0008] As a further embodiment of the present invention: a first spring is installed inside the baffle, and a first pressure block is fixedly connected to the first spring. The first pressure blocks are evenly distributed along the circumference of the baffle. A mating groove is provided on the side of the mounting ring near the baffle. The position and number of the mating grooves correspond one-to-one with the position and number of the first pressure blocks.

[0009] As a further embodiment of the present invention: the third opening is distributed at equal intervals on both sides of the first connecting plate, the fourth opening is located in the middle of the second connecting plate, and the first connecting plate and the second connecting plate are distributed alternately in the sampling tube.

[0010] As a further embodiment of the present invention: the surface of the second connecting plate is provided with a groove, the groove is in communication with the fourth opening, the outer walls of the first connecting plate and the second connecting plate are in contact with the inner wall of the mounting ring, and the mounting ring is slidably connected to the sampling tube.

[0011] As a further embodiment of the present invention: a connecting shaft is fixedly connected to the bidirectional screw, and the connecting shaft is rotatably connected to the second connecting plate.

[0012] As a further embodiment of the present invention: the buffer air chamber includes a first electric push rod mounted on a connecting pipe, a first mounting plate fixedly connected to the first electric push rod, an outer bushing fixedly mounted on the first mounting plate, a guide rod slidably mounted inside the outer bushing, a heat-conducting plate fixedly connected to the bottom of the guide rod, a memory alloy spring installed between the heat-conducting plate and the outer bushing, a second sliding plate fixedly connected to the first mounting plate, a fifth opening opened on the second sliding plate, and the inner wall of the fifth opening fitting against the outer wall of the second pressure block.

[0013] As a further embodiment of the present invention: the air intake assembly includes a second electric push rod slidably mounted on a second slide plate, a second mounting plate fixedly connected to the second electric push rod, a guide post fixedly provided at the bottom of the second mounting plate, the guide post penetrating the interior of the second pressure block, a protrusion installed inside the connecting pipe, an extension plate slidably mounted inside the protrusion, a first sealing plate installed on the connecting pipe, a second sealing plate fitted to the outer side of the first sealing plate, and the second sealing plate and the guide post being fixedly connected.

[0014] A method for detecting boiler flue gas includes the following steps: S1: Connect the connecting pipe to the boiler exhaust port so that the flue gas first enters the buffer chamber, thereby increasing the temperature. After the temperature increases, the connecting channel between the buffer chamber and the guide pipe is automatically opened. At this time, the flue gas is sent into the interior of the guide pipe and the sampling pipe through the air intake assembly, and the flue gas is detected by the gas detection sensor on the second connecting plate. S2: When detecting flue gas, the gas detection sensor on the second connecting plate closest to the guide tube will transmit the gas detection sensor signal to the servo motor and alarm light through the controller when it detects that the content of harmful substances in the flue gas exceeds the threshold. S3: When the alarm light is on, the servo motor starts and drives the bidirectional screw to rotate. The bidirectional screw drives the two adjacent first slide plates to move closer to each other, thereby blocking the fourth opening and preventing the flue gas from flowing to the gas detection sensor area on the next second connecting plate. S4: When the flue gas concentration is normal, the flue gas will pass through the gas detection sensors on the second connection plates one by one to detect the concentration of harmful substances in the flue gas.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The device is equipped with a buffer chamber, which can temporarily store some flue gas for subsequent quantitative detection by the air intake assembly, thus enhancing the accuracy of the device's detection. During air intake, the device shortens the second electric push rod, thereby squeezing the flue gas in the buffer chamber through the second pressure block, and delivering the flue gas to the detection area for detection. During detection, the flue gas first enters from the third opening on both sides of the first connecting plate, and then exits from the fourth opening in the middle of the second connecting plate, allowing the flue gas to evenly pass over the gas detection sensors on the first and second fixed plates. This solves the problem of poor detection accuracy in existing flue gas detection devices. The device can achieve centralized and accurate detection by utilizing the third and fourth openings, which first disperse and then concentrate the gas.

[0016] 2. The device is equipped with alternating first and second connecting plates. When the gas detection sensor on the second connecting plate detects that the content of harmful substances is too high, the controller can transmit the signal to the servo motor. The servo motor drives the bidirectional screw to rotate, causing the two adjacent baffles to move closer to each other, thereby blocking the fourth opening and preventing flue gas from entering the next detection area. This ensures the service life of subsequent sensors. Compared with existing multi-sensor detection, this device extends the overall service life of the device by detecting layer by layer, and solves the problem that existing flue gas detection devices cannot automatically shut down subsequent sensors after one sensor detects that the concentration is too high.

[0017] 3. The device is equipped with an air intake assembly. The second electric push rod on the air intake assembly can be adjusted to shorten its length, thereby changing the movement distance of the second pressure block. This allows the device to adjust the amount of flue gas detected in a single operation, enhancing the detection accuracy of the device. Furthermore, the lifting and lowering of the second sliding plate does not affect the normal left and right sliding of the second pressure block, while maintaining the seal between the second pressure block and the second sliding plate. The memory alloy spring and heat-conducting plate on the device can cause the memory alloy spring to contract upon heating after the flue gas enters, thereby automatically opening the channel between the connecting pipe and the guide pipe. No additional drive structure is required, enhancing the convenience of the device during use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the baffle in the unfolded state of the present invention; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 This is a schematic diagram of the overall structure of the first connecting plate and the second connecting plate of the present invention; Figure 5 This is a schematic diagram of the connection structure between the connecting pipe and the guide pipe of the present invention; Figure 6This is a schematic diagram of the contact state between the first conductive sheet and the second conductive sheet of the present invention; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B; Figure 8 This is a schematic diagram of the internal structure of the connecting pipe of the present invention; Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point C; Figure 10 for Figure 8 An enlarged schematic diagram of the structure at point D.

[0019] Reference numerals: 1. Connecting tube; 2. Guide tube; 3. Sampling tube; 4. First opening; 5. Mounting ring; 6. Docking groove; 7. Second opening; 8. Baffle; 9. First pressure block; 10. First spring; 11. First connecting plate; 12. Third opening; 13. Second connecting plate; 14. Fourth opening; 15. Groove; 16. Servo motor; 17. Controller; 18. First fixing plate; 19. Second fixing plate; 20. Gas detection sensor; 21. Bidirectional screw; 22. First sliding plate; 23. Connecting shaft; 24. First conductive sheet; 25. 2701. Warning light; 2702. Second conductive sheet; 2703. Buffer air chamber; 2704. First mounting plate; 2705. Outer bushing; 2706. Guide rod; 2707. Memory alloy spring; 2708. Second sliding plate; 2709. Heat-conducting plate; 27000. First electric push rod; 2800. Air intake assembly; 2801. Second electric push rod; 2802. Second mounting plate; 2803. Guide post; 2804. Protrusion; 2805. Extension plate; 2806. First sealing plate; 2807. Second sealing plate; 2808. Second pressure block; 39. Fifth opening. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0022] Example 1: like Figures 1-10As shown, this embodiment proposes a boiler flue gas detection device, including a connecting pipe 1, a guide pipe 2 connected to the connecting pipe 1, a sampling pipe 3 connected to the guide pipe 2, an alarm light 25 installed on the side of the sampling pipe 3, a first opening 4 and a second opening 7 provided on the sampling pipe 3, and mounting rings 5 ​​installed on both sides of the inner walls of the first opening 4 and the second opening 7, facilitating the subsequent removal or installation of the mounting rings 5 ​​in the device. A baffle 8 is provided between two adjacent mounting rings 5. A first connecting plate 11 and a second connecting plate 13 are provided inside the sampling pipe 3. A third opening 12 is opened on the first connecting plate 11, and a fourth opening 14 is opened on the second connecting plate 13. A servo motor 16 and a controller 17 are installed on the servo motor 16. A bidirectional screw 21 is fixedly connected to the output shaft of the servo motor 16. A first sliding plate 22 is threadedly connected to the outer side of the bidirectional screw 21. A first fixing plate 18 and a second fixing plate 19 are provided on the second connecting plate 13. Gas detection sensors 20 are installed on both the first fixing plate 18 and the second fixing plate 19. The controller 17 is electrically connected to the servo motor 16 and the gas detection sensors 20. A first conductive sheet 24 is provided on the second connecting plate 13. A second conductive sheet 26 is provided on the alarm light 25. A buffer gas chamber 27 and an air intake assembly 28 are installed on the connecting pipe 1. A second pressure block 29 is provided between the buffer gas chamber 27 and the air intake assembly 28. The device temporarily stores a portion of the flue gas in the buffer chamber 27, so that it can be quantitatively delivered to the sampling tube 3 for detection in conjunction with the air intake assembly 28. The four sets of first connecting plates 11 and second connecting plates 13 on the device are used to detect different indicators of the flue gas. The second connecting plate 13 closest to the guide tube 2 is the first detection zone, and so on, for a total of four detection zones. The gas detection sensor 20 in the first detection zone can be a K-type thermocouple for detecting the flue gas temperature. The gas detection sensor 20 in the second detection zone is a sulfur dioxide sensor, the gas detection sensor 20 in the third detection zone is a nitrogen oxide sensor, and the gas detection sensor 20 in the fourth detection zone is a nitrogen oxide sensor. When the flue gas temperature is too high, the gas detection sensor 20 in the first detection area transmits a signal to the alarm light 25 and the servo motor 16 through the controller 17. The servo motor 16 drives the bidirectional screw 21 to rotate, and the bidirectional screw 21 drives the two adjacent first slide plates 22 to move closer to each other until the two first slide plates 22 close the fourth opening 14, thereby disabling the remaining gas detection sensors 20 in the rear area and realizing the protection function. In addition, the device uses the third opening 12 that disperses to both sides and the fourth opening 14 that gathers to the middle to enable the flue gas to accurately pass over the gas detection sensors 20 on the first fixed plate 18 and the second fixed plate 19, thereby ensuring the detection accuracy of the device.

[0023] Example 2: The solution in Example 1 will be further described below with reference to its specific working method. like Figure 1 and Figure 8 As a preferred embodiment, based on the above method, the central axes of the connecting pipe 1, the guide pipe 2 and the sampling pipe 3 are collinear, and the connecting pipe 1, the guide pipe 2 and the sampling pipe 3 are interconnected. The flue gas in the flue gas pipe can enter the interior of the sampling pipe 3 through the connecting pipe and the guide pipe 2 so as to detect the flue gas.

[0024] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the baffles 8 are further distributed at equal intervals on the sampling tube 3, and the baffles 8 are rotatably connected to the sampling tube 3. The rotatably installed baffles 8 facilitate cleaning of the inside of the device after rotation, and can automatically open the baffles 8 to release pressure when the air pressure inside the device is too high, thus realizing the protection function.

[0025] like Figures 1-3 As shown, in a preferred embodiment, based on the above method, a first spring 10 is further installed inside the baffle 8, and a first pressure block 9 is fixedly connected to the first spring 10. The first pressure blocks 9 are evenly distributed along the circumference of the baffle 8. A mating groove 6 is opened on the side of the mounting ring 5 near the baffle 8. The position and number of the mating grooves 6 correspond one-to-one with the position and number of the first pressure blocks 9. Figure 3 It can be seen that the front end of the first pressure block 9 is a hemispherical structure, which, together with the docking groove 6, enables the baffle 8 to maintain a flexible engagement with the mounting ring 5. When the air pressure inside the device is too high, the baffle 8 can automatically unfold to release the pressure.

[0026] like Figure 8 and Figure 10 As shown, in a preferred embodiment, based on the above method, the third opening 12 is distributed at equal intervals on both sides of the first connecting plate 11, and the fourth opening 14 is located in the middle of the second connecting plate 13, so that the flue gas can first disperse and then gather to ensure the detection accuracy of the device. The first connecting plate 11 and the second connecting plate 13 are distributed alternately in the sampling tube 3. The four sets of first connecting plates 11 and second connecting plates 13 distributed alternately can detect the flue gas temperature and the concentration of different particulate matter in the flue gas respectively, realizing the function of graded detection.

[0027] like Figure 10As shown, in a preferred embodiment, based on the above method, the surface of the second connecting plate 13 is further provided with a groove 15, which communicates with the fourth opening 14. The outer walls of both the first connecting plate 11 and the second connecting plate 13 are in contact with the inner wall of the mounting ring 5, and the mounting ring 5 is slidably connected to the sampling tube 3. Flue gas can enter the next detection area through the fourth opening 14 and the groove 15. The mounting ring 5 can be completely removed from the sampling tube 3, facilitating subsequent disassembly of the first connecting plate 11 and the second connecting plate 13.

[0028] like Figure 7 As shown, in a preferred embodiment, based on the above method, a connecting shaft 23 is fixedly connected to the bidirectional screw 21, and the connecting shaft 23 is rotatably connected to the second connecting plate 13 to ensure that the end of the bidirectional screw 21 is stably supported, so that the subsequent detection area can be automatically blocked when the flue gas temperature is too high, thereby enhancing the safety of the device during use.

[0029] like Figures 6-9 As shown, in a preferred embodiment, based on the above method, the buffer air chamber 27 further includes a first electric push rod 2707 mounted on the connecting pipe 1, a first mounting plate 2701 fixedly connected to the first electric push rod 2707, an outer bushing 2702 fixedly mounted on the first mounting plate 2701, a guide rod 2703 slidably mounted inside the outer bushing 2702, a heat-conducting plate 2706 fixedly connected to the bottom of the guide rod 2703, a memory alloy spring 2704 installed between the heat-conducting plate 2706 and the outer bushing 2702, a second sliding plate 2705 fixedly connected to the first mounting plate 2701, a fifth opening 30 opened on the second sliding plate 2705, and the inner wall of the fifth opening 30 fitting against the outer wall of the second pressure block 29. The device can move the first mounting plate 2701 downward by shortening the first electric push rod 2707. When the first mounting plate 2701 moves downward, the outer bushing 2702 pushes the shape memory alloy spring 2704 and the heat-conducting plate 2706, so that the heat-conducting plate 2706 moves downward under the vertical guidance of the guide rod 2703 until the connecting pipe 1, the heat-conducting plate 2706 and the second sliding plate 2705 form a gas storage cavity, so that the device can intercept the gas for a period of time for flue gas concentration detection. When the stored flue gas reaches a suitable amount, the flue gas temperature is transferred to the shape memory alloy spring 2704 through the heat-conducting plate 2706. The shape memory alloy spring 2704 contracts and drives the heat-conducting plate 2706 to move upward so that the flue gas can be transported to the detection area for detection.

[0030] like Figure 9As shown, in a preferred embodiment, based on the above method, the intake assembly 28 further includes a second electric push rod 2801 slidably mounted on the second slide plate 2705. A second mounting plate 2802 is fixedly connected to the second electric push rod 2801. A guide post 2803 is fixedly provided at the bottom of the second mounting plate 2802. The guide post 2803 penetrates the interior of the second pressure block 29. A protrusion 2804 is installed inside the connecting pipe 1. An extension plate 2805 is slidably mounted inside the protrusion 2804. A first sealing plate 2806 is installed on the connecting pipe 1. A second sealing plate 2807 is fitted to the outer side of 2806. The second sealing plate 2807 is fixedly connected to the guide post 2803. By shortening the second electric push rod 2801, the second mounting plate 2802 and the guide post 2803 are driven to slide. The guide post 2803 drives the second pressure block 29 to slide. When the second pressure block 29 slides, it can quantitatively deliver flue gas, thereby improving the detection accuracy of the device. The protrusion 2804 and the extension plate 2805 ensure that the guide post 2803 moves horizontally left and right. The first sealing plate 2806 and the second sealing plate 2807 ensure the overall sealing effect of the device.

[0031] Example 3: The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods. Specifically, when using this boiler flue gas detection device and method: (e.g.) Figure 4 , Figure 8 and Figure 10As shown, the four sets of first connecting plates 11 and second connecting plates 13 inside the sampling tube 3 are used to detect the temperature of the flue gas and the concentration of different harmful substances. The second connecting plate 13 closest to the guide tube 2 is the first layer detection area. The four detection areas are arranged sequentially from the side closest to the guide tube 2 to the side furthest from the guide tube 2. The gas detection sensor 20 in the first layer detection area can be a K-type thermocouple for detecting the flue gas temperature. The gas detection sensor 20 in the second layer detection area is a sulfur dioxide sensor. The gas detection sensor 20 in the third layer detection area is a nitrogen oxide sensor. The gas detection sensor 20 in the fourth layer detection area is a carbon monoxide sensor. When the flue gas enters the first detection area, the second conductive plate 26 on the alarm light 25 abuts against the first conductive plate 24 of the controller 17. Therefore, when the flue gas temperature is too high, the gas detection sensor 20 in the first detection area transmits a signal to the alarm light 25 and the servo motor 16 through the controller 17. The alarm light 25 lights up, and the servo motor 16 drives the bidirectional screw 21 to rotate. The bidirectional screw 21 drives the two adjacent first slide plates 22 to move closer to each other until the two first slide plates 22 close the fourth opening 14, thereby disabling the remaining gas detection sensors 20 in the rear area. Furthermore, the device utilizes the third opening 12 that disperses to both sides in conjunction with the fourth opening 14 that converges to the center, so that the flue gas can accurately pass over the gas detection sensors 20 on the first fixed plate 18 and the second fixed plate 19.

[0032] like Figures 1-4 and Figures 6-10 As shown, the device temporarily stores a portion of the flue gas in the buffer chamber 27, so that the flue gas can be quantitatively delivered to the sampling tube 3 for detection in conjunction with the air intake assembly 28. The first electric push rod 2707 is shortened to drive the first mounting plate 2701 to move downward. When the first mounting plate 2701 moves downward, the outer bushing 2702 pushes the shape memory alloy spring 2704 and the heat conduction plate 2706, so that the heat conduction plate 2706 moves downward under the guidance of the guide rod 2703 until the connecting pipe 1, the heat conduction plate 2706 and the second sliding plate 2705 form a gas storage cavity, so that the device can intercept the gas for a period of time for flue gas concentration detection. When the stored flue gas reaches a suitable amount, the flue gas temperature is transferred to the shape memory alloy spring 2704 through the heat conduction plate 2706. The shape memory alloy spring 2704 contracts and drives the heat conduction plate 2706 to move upward, so that the flue gas can be delivered to the detection area for detection in the future. The shortening of the second electric push rod 2801 causes the second mounting plate 2802 and guide post 2803 to slide. The guide post 2803 causes the second pressure block 29 to slide. The second pressure block 29 slides different distances within the fifth opening 30, thereby quantitatively delivering flue gas. The protrusion 2804 and extension plate 2805 ensure that the guide post 2803 moves horizontally left and right. The first sealing plate 2806 and the second sealing plate 2807 ensure that the top of the connecting pipe 1 remains sealed when the guide post 2803 moves. When the gas pressure inside the device is too high, the baffle 8 will expand under the action of gas pressure. Figure 2 In the state of the device, since the front end of the first pressure block 9 is a hemispherical structure, the first spring 10, in conjunction with the docking groove 6, enables the baffle 8 to maintain a flexible engagement with the mounting ring 5. When the air pressure inside the device is too high, the baffle 8 can automatically unfold to release the pressure.

[0033] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A boiler flue gas detection device comprising a connecting pipe (1), characterized in that, The connecting pipe (1) is provided with a guide pipe (2) in communication, the guide pipe (2) is provided with a sampling pipe (3) in communication, the side of the sampling pipe (3) is provided with an alarm lamp (25), the sampling pipe (3) is provided with a first opening (4) and a second opening (7), the inner wall of the first opening (4) and the second opening (7) is provided with a mounting ring (5) on both sides, the adjacent two mounting rings (5) are provided with a baffle (8), the sampling pipe (3) is provided with a first connecting plate (11) and a second connecting plate (13), the first connecting plate (11) is provided with a third opening (12), the second connecting plate (13) is provided with a fourth opening (14), the second connecting plate (13) is provided with a servo motor (16) and a controller (17), the output shaft of the servo motor (16) is fixedly connected with a bidirectional screw rod (21), the outer side of the bidirectional screw rod (21) is threadedly connected with a first sliding plate (22), the second connecting plate (13) is provided with a first fixed plate (18) and a second fixed plate (19), the first fixed plate (18) and the second fixed plate (19) are provided with a gas detection sensor (20), the controller (17) is electrically connected with the servo motor (16) and the gas detection sensor (20), the second connecting plate (13) is provided with a first conductive sheet (24), the alarm lamp (25) is provided with a second conductive sheet (26), the connecting pipe (1) is provided with a buffer gas chamber (27) and an air inlet assembly (28), the buffer gas chamber (27) and the air inlet assembly (28) are provided with a second pressing block (29).

2. A boiler flue gas detection device according to claim 1, characterised in that, The central axes of the connecting pipe (1), the guide pipe (2) and the sampling pipe (3) are collinear, and the connecting pipe (1), the guide pipe (2) and the sampling pipe (3) are in communication with each other.

3. The boiler flue gas detection device according to claim 1, characterized in that, The baffles (8) are distributed at equal intervals on the sampling pipe (3), and the baffles (8) are rotatably connected with the sampling pipe (3).

4. The boiler flue gas detection device according to claim 1, characterized in that, The baffles (8) are rotatably connected with the sampling pipe (3).

5. The boiler flue gas detection device according to claim 1, characterized in that, The first spring (10) is fixedly connected with the first pressing block (9), and the first pressing block (9) is uniformly arranged along the circumference of the baffle (8).

6. A boiler flue gas detection device according to claim 1, characterized in that The third opening (12) is distributed at equal intervals on both sides of the first connecting plate (11), the fourth opening (14) is located in the middle of the second connecting plate (13), and the first connecting plate (11) and the second connecting plate (13) are distributed at intervals in the sampling pipe (3).

7. The device according to claim 1, wherein The surface of the second connecting plate (13) is provided with a groove (15), and the groove (15) and the fourth opening (14) are in communication with each other. The first connecting plate (11) and the second connecting plate (13) are slidably connected with the mounting ring (5). The connecting shaft (23) is rotatably connected between the second connecting plate (13).

8. The boiler flue gas detection device according to claim 1, characterized in that, The buffer air chamber (27) comprises a first electric push rod (2707) mounted on the connecting pipe (1), a first mounting plate (2701) fixedly connected to the first electric push rod (2707), an outer bushing (2702) fixedly arranged on the first mounting plate (2701), a guide rod (2703) slidably mounted in the outer bushing (2702), a heat conduction plate (2706) fixedly connected to the bottom of the guide rod (2703), a memory alloy spring (2704) mounted between the heat conduction plate (2706) and the outer bushing (2702), a second sliding plate (2705) fixedly connected to the first mounting plate (2701), and a fifth opening (30) formed in the second sliding plate (2705), wherein the inner wall of the fifth opening (30) and the outer wall of the second pressing block (29) are in close contact with each other.

9. A flue gas detection device for a boiler as claimed in claim 8, wherein The air inlet assembly (28) comprises a second electric push rod (2801) slidably mounted on the second sliding plate (2705), a second mounting plate (2802) fixedly connected to the second electric push rod (2801), a guide column (2803) fixedly arranged at the bottom of the second mounting plate (2802), the guide column (2803) penetrating into the interior of the second pressing block (29), a protrusion (2804) mounted in the connecting pipe (1), an extension plate (2805) slidably mounted in the protrusion (2804), a first sealing plate (2806) mounted on the connecting pipe (1), a second sealing plate (2807) fixedly arranged on the outer side of the first sealing plate (2806), and the second sealing plate (2807) and the guide column (2803) being fixedly connected.

10. A method for detecting flue gas of a boiler, using the flue gas detection device of claim 1, characterized in that, The method comprises the following steps: S1: abutting the connecting pipe (1) with the boiler smoke outlet, so that the flue gas first enters the buffer air chamber (27), thereby increasing the temperature, and after the temperature increases, the communication passage between the buffer air chamber (27) and the guide pipe (2) is automatically opened, at this time, the flue gas is sent into the interior of the guide pipe (2) and the sampling pipe (3) through the air inlet assembly (28), and the flue gas is detected by the gas detection sensor (20) on the second connecting plate (13); S2: when the gas detection sensor (20) closest to the guide pipe (2) on the second connecting plate (13) detects that the harmful substance content in the flue gas exceeds the threshold value, the gas detection sensor (20) signal is transmitted to the servo motor (16) and the alarm lamp (25) through the controller (17); S3: when the alarm lamp (25) is lighted, the servo motor (16) is started to drive the bidirectional screw rod (21) to rotate, the bidirectional screw rod (21) drives the adjacent two first sliding plates (22) to move close to each other, thereby blocking the fourth opening (14), so that the flue gas cannot flow to the area of the gas detection sensor (20) on the next second connecting plate (13); S4: when the flue gas concentration is normal, the flue gas passes through the gas detection sensor (20) on each second connecting plate (13) one by one, and the harmful substance concentration of the flue gas is detected.

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