A nitrogen oxide intelligent detection system and its use method

Abstract

The present invention relates to the technical field related to nitrogen oxide detection. The present invention provides an intelligent nitrogen oxide detection system and a method for using the same, comprising a flue tube and an upper ring cover and a lower ring cover fixedly arranged at the upper and lower ends of the flue tube, a longitudinally extending sampling rod is arranged in the flue tube, and the upper and lower ends of the sampling rod are respectively connected to the upper ring cover and the lower ring cover, the sampling rod comprises an outer tube and a middle tube, the outer tube is sleeved on the outer side of the middle tube, and a cooling ring cavity is formed between the outer tube and the middle tube, an installation slot is provided on the outer tube, and a sampling tube is inserted into the installation slot, the device is provided with an exhalation mode, and clean gas is used to replace the residual flue gas in the sampling tube and the detection cavity, in order to improve the effectiveness of exhalation, each time the piston tube moves upward to exhale, the clean gas in the exhalation cavity is ejected downward through a one-way jet port, and the exhaust gas in the detection cavity is replaced by the clean gas, so as to reduce the error caused by the residual nitrogen oxides to the next measurement.

Description

Technical Field

[0001] The present invention belongs to the technical field related to nitrogen oxide detection, and more specifically, particularly relates to an intelligent nitrogen oxide detection system and a method for using the same. Background Art

[0002] Nitrogen oxides (NOx) are one of the main components of air pollution, mainly coming from industrial production, automobile exhaust and combustion processes. NOx is not only harmful to human health, but also causes environmental problems such as acid rain and photochemical smog. Therefore, accurate detection and monitoring of NOx has become an important part of environmental protection and industrial production.

[0003] The prior art still has the following technical problems: Traditional NOx detection systems usually adopt a decentralized design and use multi-point measurement to improve data reliability. The distribution of sampling points occupies a large space and is inconvenient to install. Each detection module operates independently, resulting in a large system size, complex installation, and difficulty in achieving multi-point synchronous detection. In addition, when traditional detection systems work in a high-temperature flue gas environment, the sensor is easily affected by the high temperature, resulting in inaccurate measurement data and even shortening the service life of the sensor. At the same time, the problem of flue gas residue will also affect the accuracy of subsequent measurements, especially in continuous monitoring scenarios. Residual NOx will cause measurement errors to accumulate, further reducing the reliability of the data.

[0004] In order to solve the above problems, some integrated NOx detection systems have been proposed in the prior art, but these systems often have limitations in terms of size reduction and functional integration, especially in terms of cooling treatment of high-temperature flue gas, sensor protection and system self-cleaning. In addition, the existing detection system lacks an effective self-cleaning and exhaust gas removal mechanism, which causes the sensor to be exposed to harsh environments for a long time, affecting its service life and measurement accuracy.

[0005] Therefore, there is an urgent need for a new intelligent nitrogen oxide detection system that can achieve system integration and miniaturization while ensuring detection accuracy, and has efficient cooling, self-cleaning and exhaust gas removal functions to extend the service life of the sensor and improve the accuracy and reliability of the measurement data. Summary of the invention

[0006] The present invention provides an intelligent nitrogen oxide detection system and a method of using the same, which are used to overcome the above-mentioned defects in the prior art.

[0007] The purpose and efficacy of the intelligent nitrogen oxide detection system and its use method of the present invention are achieved by the following specific technical means: A nitrogen oxide intelligent detection system comprises a flue tube and an upper ring cover and a lower ring cover fixedly arranged at the upper and lower ends of the flue tube, a longitudinally extending sampling rod is arranged in the flue tube, the upper and lower ends of the sampling rod are respectively connected to the upper ring cover and the lower ring cover, the sampling rod comprises an outer tube and a middle tube, the outer tube is sleeved on the outer side of the middle tube, and a cooling ring cavity is formed between the outer tube and the middle tube, an installation slot is arranged on the outer tube, a sampling tube is inserted into the installation slot, the sampling tube extends in the cooling ring cavity along a direction tangent to the middle tube, an air vent is arranged in the sampling tube, a flue gas inlet aligned with the air vent is arranged on the side of the middle tube, a partition tube is fixedly arranged in the middle tube, and a partition tube is partitioned. A piston cylinder is slidably arranged on the lower side of the partition cylinder, a detection chamber is formed between the partition cylinder and the piston cylinder, the smoke inlet is connected with the detection chamber, an inner cylinder is longitudinally slidably arranged at the axis center of the middle cylinder, the inner cylinder is fixedly connected with the piston cylinder, a nitrogen oxide detection head is installed on the outer wall of the inner cylinder, the nitrogen oxide detection head is in the detection chamber, an exhalation piston is slidably arranged on the upper side of the partition cylinder, an exhalation chamber is formed between the exhalation piston and the partition cylinder, a support rod is extended downwardly from the partition cylinder, a traction line is arranged between the piston cylinder and the exhalation piston, the support rod supports the traction line downward, a jet device connected with the detection chamber is also arranged in the exhalation chamber, and the exhalation chamber also has a replenishing flow device.

[0008] According to a further technical solution, a thermal insulation layer is provided on the outer surface of the outer cylinder, a cooling fluid is filled in the cooling ring cavity, a first cover is fixedly provided on the top of the outer cylinder, a second cover is fixedly provided on the bottom of the outer cylinder, a discharge pipe connected to the cooling ring cavity is provided on the upper end surface of the first cover, and a liquid inlet pipe connected to the cooling ring cavity is provided on the lower end surface of the second cover.

[0009] A further technical solution is that a plurality of sampling tubes are distributed in a longitudinal spiral with the flue tube as the axis, the sampling tubes include a first sampling tube and a second sampling tube, the first sampling tube and the second sampling tube are connected by an elastic connecting tube, the elastic connecting tube is elastic, a filter cover is detachably provided at the opening of the first sampling tube, a tail plug is fixedly provided at the tail of the second sampling tube, the mounting slot and the second sampling tube are combined to form a sampling cavity, and the portion of the tail plug extending into the sampling cavity is an inclined surface facing the flue gas inlet.

[0010] A further technical solution is that a middle cylinder cover is fixedly arranged at the upper and lower ends of the middle cylinder, a sealing hole is opened in the center of the middle cylinder cover, the inner cylinder passes through the sealing hole, a motor is fixedly installed on the upper surface of the first cover, a driving gear is fixedly arranged on the shaft of the motor, a passive gear is fixedly arranged on the upper end of the inner cylinder, and the passive gear is meshed with the driving gear.

[0011] A further technical solution is that a cable protection shell is installed at the bottom opening of the inner cylinder, a cable connector is arranged in the cable protection shell, a detection cable for connecting the nitrogen oxide detection head is arranged in the inner cylinder, the detection cable extends downward and is connected to the cable connector, a rotating ring is arranged at the lower end of the cable protection shell, a mounting plate is fixedly arranged at the lower end of the second cover, a telescopic rod is fixedly arranged in the middle of the mounting plate, and the telescopic shaft of the telescopic rod is rotatably connected to the rotating ring.

[0012] A further technical solution is that the jet device includes a jet tube arranged in the exhalation chamber, the exhalation piston includes an upper ring body at the top, a movable sleeve in the middle and a lower ring body at the bottom, the movable sleeve is on the outside of the inner tube and slides up and down outside the inner tube, the jet tube is sleeved outside the movable sleeve, and the lower end of the jet tube is fixedly connected to the lower ring body, a gas flow channel is formed between the jet tube and the movable sleeve, a limit ring is fixedly arranged on the upper side of the jet tube, a reset spring for pushing the limit ring to reset upward is arranged between the limit ring and the separation tube, a one-way jet port is opened on the lower side wall of the jet tube, and the downward movement of the exhalation piston drives the limit ring to move downward, so that the one-way jet port leaks downward into the detection chamber.

[0013] A further technical solution is that the flow replenishing device includes a one-way opening formed on an upper ring body, an elastic pad is arranged on the lower surface of the upper ring body, the elastic pad elastically covers the lower opening of the one-way opening, the elastic pad can be separated from the lower opening of the one-way opening by a downward force, an air replenishing cylinder is arranged on the upper side of the exhalation piston, the air replenishing cylinder is fixedly connected to the inner cylinder, a switching groove is arranged on the side wall of the air replenishing cylinder, a liquid replenishing port is arranged on the side wall of the middle cylinder, and the rotation of the inner cylinder drives the air replenishing cylinder to rotate synchronously so that the switching groove is aligned or staggered with the liquid replenishing port.

[0014] According to a further technical solution, an air inlet pipe is provided at the top opening of the inner cylinder, a solenoid valve is installed in the air inlet pipe, an air replenishment hole is provided on the side wall of the inner cylinder, an air replenishment cavity is formed between the air replenishment cylinder and the exhalation piston, and the air replenishment hole is located in a position connected to the air replenishment cavity.

[0015] According to a further technical solution, a longitudinal flue gas groove extending longitudinally is provided on the side wall of the piston cylinder, and the inner cylinder drives the piston cylinder to rotate so that the longitudinal flue gas groove is staggered or aligned with the flue gas inlet.

[0016] A further technical solution also includes a processing module and a display module. The cable connector is connected to the processing module via a cable. The processing module receives and processes the signal from the nitrogen oxide detection head, and the processing module sends a display signal to the display module.

[0017] Compared with the prior art, the present invention has the following beneficial effects: An intelligent nitrogen oxide detection system of the present invention integrates the nitrogen oxide detection system and reduces its volume. A plurality of nitrogen oxide detection heads are vertically integrated into a middle cylinder to measure the nitrogen oxide content at multiple points and ensure the accuracy of the data. An outer cylinder is arranged on the outside of the middle cylinder, and a cooling ring cavity for the passage of cold liquid is arranged between the outer cylinder and the middle cylinder. A sampling tube is inserted from the outside to the inside on the side wall of the outer cylinder, and the flue gas enters the middle cylinder through the sampling tube. When flowing through the sampling tube, the high-temperature flue gas is cooled by the sampling tube body. Since the extension direction of the sampling tube remains tangent to the middle cylinder, the length of the sampling tube in the cooling ring cavity is extended, which is beneficial to further reduce the flue gas temperature, so that the nitrogen oxide detection head is at a suitable working temperature, the service life of the nitrogen oxide detection head is extended, and the accuracy of the test data is maintained.

[0018] An intelligent nitrogen oxide detection system of the present invention is provided with an exhalation mode, the purpose of which is to use clean gas to replace the residual smoke in the sampling tube and the detection chamber to improve the accuracy of the next measurement. With the up and down reciprocating movement of the piston cylinder, the detection chamber realizes two alternating actions of exhalation and inhalation. In order to improve the effectiveness of exhalation, the device is provided with an exhalation piston, a jet tube, etc., and each time the piston cylinder moves upward to exhale, the traction line drives the lower ring body to move downward, so that the jet tube moves downward, and the upper ring body moves downward to squeeze the space of the exhalation chamber, and the air pressure in the exhalation chamber increases until the one-way jet port on the jet tube moves downward. The clean gas in the exhalation chamber leaks out into the detection chamber, and is ejected downward through the one-way jet port. The exhaust gas in the detection chamber is replaced by clean gas to reduce the error caused by the residual nitrogen oxides to the next measurement. Each time the piston cylinder inhales and samples, there will be an exhalation and exhaust action to ensure that the detection chamber maintains a good cleanliness before each sampling test, thereby improving the accuracy of the data and reducing the long-term exposure of the nitrogen oxide detection head to the flue gas environment. It will only be normally exposed to the flue gas environment during testing, thereby increasing the service life of the nitrogen oxide detection head and improving the accuracy of data testing.

[0019] An intelligent nitrogen oxide detection system of the present invention is provided with a self-cleaning mode, which can regularly spray liquid for cleaning in the detection cavity and the sampling tube in the reverse direction. When cleaning is required, the switching groove and the liquid replenishing port are aligned, and the liquid in the cooling ring cavity enters the air replenishing cavity through the liquid replenishing port and the switching groove, and a part of air is retained in the air replenishing cavity. The solenoid valve is opened, and the air pump pumps clean gas into the inner cylinder, and the clean gas is replenished into the air replenishing cavity through the air replenishing hole to increase the air pressure in the air replenishing cavity. When the exhalation piston moves upward, the elastic pad opens the restriction on the one-way opening, and the liquid and gas in the air replenishing cavity can enter the exhalation cavity downward. When the exhalation piston moves downward, the liquid and gas in the exhalation cavity can be sprayed circumferentially toward the inner wall of the detection cavity at high speed through the one-way jet port to achieve a self-cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1A longitudinal cross-sectional view of Figure 3 is a longitudinal cross-sectional view of the sampling rod of the present invention; Figure 4 is a transverse cross-sectional view of the sampling rod of the present invention; Figure 5 It is a schematic diagram of the structure of the sampling tube inserted into the cooling ring cavity in the present invention; Figure 6 is a partial cross-sectional view of the cylinder of the present invention; Figure 7 is a longitudinal cross-sectional view of the middle tube of the present invention; Figure 8 It is a schematic diagram of the structure of the exhalation piston in the cylinder of the present invention; Fig. 9 It is a structural schematic diagram of the lower ring cover in the present invention.

[0023] Description of reference numerals: Flue tube 10, upper ring cover 11, lower ring cover 12, connecting rod 13, sampling rod 14, ventilation channel 15, outer ring 17, first cover 19, driving gear 20, motor 21, drain pipe 22, passive gear 23, solenoid valve 24, outer tube 25, middle tube 26, inner tube 27, insulation layer 28, cooling ring cavity 29, sampling tube 30, telescopic rod 31, second cover 32, mounting plate 33, liquid inlet pipe 34, rotating ring 35, cable connector 36, cable protective shell 37, liquid inlet port 38, air inlet cylinder 39, air inlet hole 40, separation cylinder 41, exhalation piston 42, exhalation Air cavity 43, one-way opening 44, elastic pad 45, jet tube 46, return spring 47, gas flow channel 48, support rod 49, traction line 50, piston cylinder 51, detection cable 52, nitrogen oxide detection head 53, flue gas inlet 54, flue gas longitudinal groove 55, detection cavity 56, switching groove 58, center ring 59, installation slot 60, second sampling cylinder 61, first sampling cylinder 62, elastic connecting tube 63, filter cover 64, sampling cavity 65, tail plug 66, middle cylinder cover 69, upper ring body 71, lower ring body 72, movable sleeve 73, limit ring 74, air replenishment cavity 75. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See attached Figure 1 -Attached Fig. 9A nitrogen oxide intelligent detection system includes a flue tube 10 and an upper ring cover 11 and a lower ring cover 12 fixedly arranged at the upper and lower ends of the flue tube 10. A longitudinally extending sampling rod 14 is arranged at the axis of the flue tube 10. The upper and lower ends of the sampling rod 14 are respectively connected to the upper ring cover 11 and the lower ring cover 12. The sampling rod 14 includes an outer tube 25 and a middle tube 26. The outer tube 25 is sleeved on the outside of the middle tube 26, and a drop is formed between the outer tube 25 and the middle tube 26. The outer tube 25 is provided with a mounting slot 60, a sampling tube 30 is inserted into the mounting slot 60, the sampling tube 30 extends in the cooling ring chamber 29 along a direction tangent to the middle tube 26, the sampling tube 30 is provided with a vent hole, a side of the middle tube 26 is provided with a smoke inlet 54 aligned with the vent hole, a separation tube 41 is fixedly arranged in the middle tube 26, a piston tube 51 is slidably arranged at the lower side of the separation tube 41, and a spacer 41 is provided between the separation tube 41 and the piston tube 51. A detection chamber 56 is formed, and the smoke inlet 54 is connected to the detection chamber 56. An inner cylinder 27 is longitudinally slidably arranged at the axis of the middle cylinder 26, and the inner cylinder 27 is fixedly connected to the piston cylinder 51. A nitrogen oxide detection head 53 is installed on the outer wall of the inner cylinder 27, and the nitrogen oxide detection head 53 is in the detection chamber 56. An exhalation piston 42 is slidably arranged on the upper side of the separation cylinder 41, and an exhalation chamber 43 is formed between the exhalation piston 42 and the separation cylinder 41. A support rod 49 is extended downwardly from the separation cylinder 41, and a traction line 50 is arranged between the piston cylinder 51 and the exhalation piston 42. The support rod 49 supports the traction line 50 downward, and the piston cylinder 51 moves upward to drive the exhalation piston 42 to move downward through the traction line 50. A jet device connected to the detection chamber 56 is also arranged in the exhalation chamber 43, and the exhalation chamber 43 also has a flow replenishing device. As the volume of the detection chamber 56 decreases, the jet device automatically sprays into the detection chamber 56 for cleaning.

[0028] Specifically, the air inlet of the sampling tube 30 is oriented downward to facilitate the entry of smoke and the discharge of internal fluid. The lower ring cover 12 and the upper ring cover 11 have the same structure, both including a center ring 59 and an outer ring 17, the center ring 59 and the outer ring 17 are concentrically arranged, and a plurality of connecting rods 13 are fixedly connected in the annular gap between the center ring 59 and the outer ring 17, and a ventilation channel 15 for smoke to pass through is formed between two adjacent connecting rods 13.

[0029] Preferably, the outer surface of the outer cylinder 25 is provided with an insulation layer 28, the cooling ring cavity 29 is filled with a cooling fluid, a first cover 19 is fixedly provided on the top of the outer cylinder 25, and a second cover 32 is fixedly provided on the bottom of the outer cylinder 25, and the upper end surface of the first cover 19 is provided with a drain pipe 22 connected to the cooling ring cavity 29, and the lower end surface of the second cover 32 is provided with a liquid inlet pipe 34 connected to the cooling ring cavity 29.

[0030] In specific implementation, the device further comprises a liquid pump, which is used to replenish low-temperature fluid to the liquid inlet pipe 34, and the liquid discharge pipe 22 is used to discharge high-temperature fluid upward.

[0031] Preferably, the plurality of sampling tubes 30 are longitudinally spirally distributed with the flue tube 10 as the axis, and the sampling tubes 30 include a first sampling tube 62 and a second sampling tube 61, and the first sampling tube 62 and the second sampling tube 61 are connected by an elastic connecting tube 63, and the elastic connecting tube 63 is elastic. A filter cover 64 is detachably provided at the opening of the first sampling tube 62, and a tail plug 66 is fixedly provided at the tail of the second sampling tube 61. The mounting slot 60 and the second sampling tube 61 are combined to form a sampling cavity 65, and the portion of the tail plug 66 extending into the sampling cavity 65 is an inclined surface facing the flue gas inlet 54.

[0032] In this embodiment, in order to facilitate the operator to install the sampling tube 30, when inserting the blind end of the sampling tube 30 into the installation slot 60, the second sampling tube 61 will first hit the middle tube 26. Since the elastic connecting tube 63 is elastic, the second sampling tube 61 can avoid it to a certain extent to facilitate continued insertion until the opening of the side wall of the second sampling tube 61 is aligned with the smoke inlet 54. In order to limit the rotation direction of the sampling tube 30 to ensure that the opening of the side wall of the second sampling tube 61 can be aligned with the smoke inlet 54, a keyway structure is designed on the inner wall of the installation slot 60, and a corresponding keyway structure is designed on the outer wall of the first sampling tube 62 to limit the rotation of the sampling tube 30 around itself.

[0033] Preferably, a middle cylinder cover 69 is fixedly provided at the upper and lower ends of the middle cylinder 26, a sealing hole is opened at the center of the middle cylinder cover 69, the inner cylinder 27 passes through the sealing hole, a motor 21 is fixedly installed on the upper surface of the first cover 19, a driving gear 20 is fixedly provided on the shaft of the motor 21, a passive gear 23 is fixedly provided at the upper end of the inner cylinder 27, and the passive gear 23 is meshed with the driving gear 20.

[0034] In this embodiment, the inner cylinder 27 can move freely up and down or rotate in the sealing hole under the restriction of the sealing hole. The motor 21 provides power for the rotation of the inner cylinder 27. The driving gear 20 extends longitudinally and is specifically a spur gear. The passive gear 23 can slide up and down relative to the driving gear 20 while maintaining a meshing state. The passive gear 23 and the driving gear 20 adopt an axially slidable spur gear meshing structure.

[0035] Preferably, a cable protection shell 37 is installed at the bottom opening of the inner cylinder 27, and a cable connector 36 is arranged in the cable protection shell 37. A detection cable 52 for connecting the nitrogen oxide detection head 53 is arranged in the inner cylinder 27, and the detection cable 52 extends downward and is connected to the cable connector 36. Specifically, a rotatable electrical connector is used to achieve dynamic connection, and a rotating ring 35 is provided at the lower end of the cable protection shell 37, and a mounting plate 33 is fixedly arranged at the lower end of the second cover 32, and a telescopic rod 31 is fixedly installed in the middle of the mounting plate 33, and the telescopic axis of the telescopic rod 31 is rotatably connected to the rotating ring 35.

[0036] Preferably, the jet device includes a jet tube 46 arranged in the exhalation chamber 43, the exhalation piston 42 includes an upper ring body 71 at the top, a movable sleeve 73 in the middle and a lower ring body 72 at the bottom, the movable sleeve 73 is on the outside of the inner tube 27 and slides up and down outside the inner tube 27, the jet tube 46 is sleeved outside the movable sleeve 73, and the lower end of the jet tube 46 is fixedly connected to the lower ring body 72, a gas flow channel 48 is formed between the jet tube 46 and the movable sleeve 73, a limit ring 74 is fixedly provided on the upper side of the jet tube 46, a reset spring 47 for pushing the limit ring 74 to reset upward is provided between the limit ring 74 and the separation tube 41, a one-way jet port is opened on the lower side wall of the jet tube 46, the exhalation piston 42 moves downward to drive the limit ring 74 to move downward, so that the one-way jet port leaks downward into the detection chamber 56.

[0037] Specifically, the one-way jet port includes a through hole formed in the side wall of the jet tube 46 , in which a one-way nozzle is installed, and the spraying direction of the one-way nozzle is toward the detection cavity 56 .

[0038] Preferably, the flow replenishing device includes a one-way opening 44 opened on the upper ring body 71, and an elastic pad 45 is arranged on the lower surface of the upper ring body 71, and the elastic pad 45 elastically covers the lower opening of the one-way opening 44, and the elastic pad 45 can be separated from the opening on the lower side of the one-way opening 44 under the downward force, and an air replenishing cylinder 39 is arranged on the upper side of the exhalation piston 42, and the air replenishing cylinder 39 is fixedly connected to the inner cylinder 27, and a switching groove 58 is arranged on the side wall of the air replenishing cylinder 39, and a liquid replenishing port 38 is arranged on the side wall of the middle cylinder 26, and the rotation of the inner cylinder 27 drives the air replenishing cylinder 39 to rotate synchronously, so that the switching groove 58 is aligned or staggered with the liquid replenishing port 38.

[0039] Preferably, an air inlet pipe is provided at the top opening of the inner cylinder 27, and a solenoid valve 24 is installed in the air inlet pipe. An air replenishment hole 40 is provided on the side wall of the inner cylinder 27, and an air replenishment cavity 75 is formed between the air replenishment cylinder 39 and the exhalation piston 42. The air replenishment hole 40 is located in a position connected to the air replenishment cavity 75.

[0040] Preferably, a longitudinal flue gas groove 55 extending longitudinally is formed on the side wall of the piston cylinder 51 , and the inner cylinder 27 drives the piston cylinder 51 to rotate so that the longitudinal flue gas groove 55 is staggered or aligned with the flue gas inlet 54 .

[0041] Preferably, it also includes a processing module and a display module, the cable connector 36 is connected to the processing module via a cable, the processing module receives and processes the signal from the nitrogen oxide detection head 53, and the processing module sends a display signal to the display module.

[0042] How to use this device: First, the device is installed at the chimney, and the smoke passes through the inside of the flue tube 10 from bottom to top. The upper ring cover 11 and the lower ring cover 12 are set to fix the sampling rod 14 and the center of the smoke. The telescopic rod 31 is started, and the telescopic rod 31 drives the inner cylinder 27 to move downward, and the inner cylinder 27 drives the piston cylinder 51 to move downward. Since the position of the separation cylinder 41 remains unchanged, the volume of the detection chamber 56 increases, and the external smoke enters the sampling tube 30 first. Since the sampling tube 30 is in the cooling ring cavity 29, the temperature of the smoke is reduced, and since the extension direction of the sampling tube 30 is tangent to the middle cylinder 26, the length of the sampling tube 30 in the cooling ring cavity 29 is extended, which is conducive to further reducing the smoke temperature. The smoke with a suitable temperature enters the detection cavity 56 through the smoke inlet 54 and the smoke longitudinal groove 55. The nitrogen oxide detection head 53 detects the nitrogen oxide content in the gas, and feeds back the detection result to the processing unit through the detection cable 52, completing a gas extraction detection action.

[0043] Second, after the exhaust detection is completed, in order to smoothly remove the smoke remaining in the detection chamber 56 and the sampling tube 30 and facilitate the next detection, the device is specially provided with an exhalation mode. Specifically, the telescopic rod 31 drives the inner cylinder 27 to reset upward, and the inner cylinder 27 pulls the traction line 50. Under the support of the support rod 49, the upper end of the traction line 50 drives the exhalation piston 42 to move downward. At this time, the piston cylinder 51 moves upward, the space of the detection chamber 56 is reduced, and the residual smoke inside is discharged outward through the smoke inlet 54 and the sampling tube 30. In order to further reduce the residual gas In order to improve the content of the body and improve the accuracy of the next detection, during the upward movement of the piston cylinder 51, the traction line 50 drives the lower ring body 72 to move downward, so that the jet tube 46 moves downward, and the upper ring body 71 moves downward to squeeze the space in the exhalation chamber 43. The air pressure in the exhalation chamber 43 increases, and the return spring 47 is compressed until the one-way jet port on the jet tube 46 leaks downward into the detection chamber 56. The high-pressure gas in the exhalation chamber 43 is ejected downward through the one-way jet port, and the exhaust gas in the detection chamber 56 is replaced by clean gas, thereby eliminating the cross contamination of the residual gas to the subsequent detection.

[0044] Third, the detection chamber 56 will absorb dirt in the flue gas, and long-term use will affect the internal cleanliness and reduce the accuracy of the detection of the nitrogen oxide detection head 53. In order to overcome this problem, the device is specially provided with a cleaning mode. Specifically, the motor 21 drives the active gear 20 to rotate, the active gear 20 drives the passive gear 23 to rotate, and the passive gear 23 drives the inner cylinder 27 and the air supply cylinder 39 to rotate a certain angle so that the switching groove 58 and the liquid supply port 38 are aligned, and clean liquid is retained in the cooling ring cavity 29. As the telescopic rod 31 extends upward, the space of the air supply cavity 75 increases, and the liquid in the cooling ring cavity 29 enters the air supply cavity 75 through the liquid supply port 38 and the switching groove 58. After a certain time, the motor 21 rotates in the opposite direction to close the liquid replenishment port 38, so that some air remains in the air replenishment chamber 75. An air pump is arranged outside the device, and the solenoid valve 24 is opened. The air pump pumps clean gas into the inner cylinder 27, and the clean gas is replenished into the air replenishment chamber 75 through the air replenishment hole 40 to increase the air pressure in the air replenishment chamber 75. Whenever the exhalation piston 42 moves upward, the elastic pad 45 opens the restriction on the one-way opening 44, and the liquid and gas in the air replenishment chamber 75 can flow downward into the exhalation chamber 43. Whenever the exhalation piston 42 moves downward, the liquid and gas in the exhalation chamber 43 can be sprayed circumferentially at high speed toward the inner wall of the detection chamber 56 through the one-way jet port to achieve a self-cleaning effect.

[0045] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. An intelligent nitrogen oxide detection system, characterized by: The invention comprises a flue tube and an upper ring cover and a lower ring cover fixedly arranged at the upper and lower ends of the flue tube, a longitudinally extending sampling rod is arranged in the flue tube, the upper and lower ends of the sampling rod are respectively connected with the upper ring cover and the lower ring cover, the sampling rod comprises an outer tube and a middle tube, the outer tube is sleeved on the outer side of the middle tube, and a cooling ring cavity is formed between the outer tube and the middle tube, an installation slot is arranged on the outer tube, a sampling tube is inserted into the installation slot, the sampling tube extends in the cooling ring cavity along a direction tangent to the middle tube, an air vent is arranged on the sampling tube, a smoke inlet aligned with the air vent is arranged on the side of the middle tube, a separation tube is fixedly arranged in the middle tube, and a sliding device is arranged on the lower side of the separation tube A piston cylinder is arranged, a detection chamber is formed between the separation cylinder and the piston cylinder, the smoke inlet is connected with the detection chamber, an inner cylinder is longitudinally slidably arranged at the axis center of the middle cylinder, the inner cylinder is fixedly connected with the piston cylinder, a nitrogen oxide detection head is installed on the outer wall of the inner cylinder, the nitrogen oxide detection head is located in the detection chamber, an exhalation piston is slidably arranged on the upper side of the separation cylinder, an exhalation chamber is formed between the exhalation piston and the separation cylinder, a support rod is extended downwardly from the separation cylinder, a traction line is arranged between the piston cylinder and the exhalation piston, the support rod supports the traction line downward, a jet device connected with the detection chamber is also arranged in the exhalation chamber, and the exhalation chamber also has a supplementary flow device.

2. The intelligent nitrogen oxide detection system according to claim 1 is characterized in that: The outer surface of the outer cylinder is provided with an insulation layer, the cooling ring cavity is filled with a cooling fluid, a first cover is fixedly provided on the top of the outer cylinder, and a second cover is fixedly provided on the bottom of the outer cylinder, a discharge pipe connected to the cooling ring cavity is provided on the upper end surface of the first cover, and a liquid inlet pipe connected to the cooling ring cavity is provided on the lower end surface of the second cover.

3. The intelligent nitrogen oxide detection system according to claim 1 is characterized in that: The plurality of sampling tubes are longitudinally spirally distributed with the flue tube as the axis, the sampling tubes include a first sampling tube and a second sampling tube, the first sampling tube and the second sampling tube are connected by an elastic connecting tube, the elastic connecting tube is elastic, a filter cover is detachably provided at the opening of the first sampling tube, a tail plug is fixedly provided at the tail of the second sampling tube, the mounting slot and the second sampling tube are combined to form a sampling cavity, the portion of the tail plug extending into the sampling cavity is an inclined surface facing the flue gas inlet.

4. The intelligent nitrogen oxide detection system according to claim 2 is characterized in that: The middle cylinder covers are fixedly arranged at the upper and lower ends of the middle cylinder, a sealing hole is provided at the center of the middle cylinder cover, the inner cylinder passes through the sealing hole, a motor is fixedly installed on the upper surface of the first cover, a driving gear is fixedly arranged on the shaft of the motor, a passive gear is fixedly arranged on the upper end of the inner cylinder, and the passive gear is meshed with the driving gear.

5. The intelligent nitrogen oxide detection system according to claim 2 is characterized in that: A cable protection shell is installed at the bottom opening of the inner cylinder, a cable connector is arranged in the cable protection shell, a detection cable for connecting the nitrogen oxide detection head is arranged in the inner cylinder, the detection cable extends downward and is connected to the cable connector, a rotating ring is arranged at the lower end of the cable protection shell, a mounting plate is fixedly arranged at the lower end of the second cover, a telescopic rod is fixedly arranged in the middle of the mounting plate, and the telescopic shaft of the telescopic rod is rotatably connected to the rotating ring.

6. The intelligent nitrogen oxide detection system according to claim 1, characterized in that: The jet device includes a jet tube arranged in the exhalation chamber, the exhalation piston includes an upper ring body at the top, a movable sleeve in the middle and a lower ring body at the bottom, the movable sleeve is on the outside of the inner tube and slides up and down outside the inner tube, the jet tube is sleeved outside the movable sleeve, and the lower end of the jet tube is fixedly connected to the lower ring body, a gas flow channel is formed between the jet tube and the movable sleeve, a limit ring is fixedly provided on the upper side of the jet tube, a reset spring for pushing the limit ring to reset upward is provided between the limit ring and the separation tube, a one-way jet port is opened on the lower side wall of the jet tube, and the downward movement of the exhalation piston drives the limit ring 74 to move downward, so that the one-way jet port leaks downward into the detection chamber 56.

7. The intelligent nitrogen oxide detection system according to claim 6, characterized in that: The flow replenishment device includes a one-way opening formed on the upper ring body, an elastic pad is arranged on the lower surface of the upper ring body, the elastic pad elastically covers the lower opening of the one-way opening, and the elastic pad can be separated from the opening on the lower side of the one-way opening by a downward force, an air replenishment cylinder is arranged on the upper side of the exhalation piston, the air replenishment cylinder is fixedly connected to the inner cylinder, a switching groove is arranged on the side wall of the air replenishment cylinder, and a liquid replenishment port is arranged on the side wall of the middle cylinder, and the rotation of the inner cylinder drives the air replenishment cylinder to rotate synchronously so that the switching groove is aligned with or staggered with the liquid replenishment port.

8. The intelligent nitrogen oxide detection system according to claim 7, characterized in that: An air inlet pipe is arranged at the top opening of the inner cylinder, a solenoid valve is installed in the air inlet pipe, an air replenishment hole is arranged on the side wall of the inner cylinder, an air replenishment cavity is formed between the air replenishment cylinder and the exhalation piston, and the air replenishment hole is located in a position connected to the air replenishment cavity.

9. The intelligent nitrogen oxide detection system according to claim 1, characterized in that: The side wall of the piston cylinder is provided with a longitudinal flue gas groove extending longitudinally, and the inner cylinder drives the piston cylinder to rotate so that the longitudinal flue gas groove is staggered or aligned with the flue gas inlet.

10. The intelligent nitrogen oxide detection system according to claim 5, characterized in that: It also includes a processing module and a display module. The cable connector is connected to the processing module via a cable. The processing module receives and processes the signal from the nitrogen oxide detection head. The processing module sends a display signal to the display module.

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