Detection device for laser gas analysis

Abstract

The invention relates to the technical field of laser gas analysis, and discloses a detection device for laser gas analysis, which comprises a detection pipe, the outer wall of the detection pipe is fixedly communicated with a connecting pipe, the outer wall of the detection pipe is fixedly connected with a detection block, the outer wall of the detection pipe is fixedly communicated with a nitrogen filling pipe, the inner wall of the detection pipe is fixedly connected with a separation plate, and the separation plate is fixedly connected with a gas inlet pipe. A through hole is formed in the outer wall of the isolation plate, a buffer mechanism is arranged in the detection pipe, the reversing mechanism is arranged in the detection pipe and comprises a reversing block, and the outer wall of the reversing block is rotationally connected with the inner wall of the detection pipe through a bearing. According to the gas detection device, the volume of the detection gas is reversed through the reversing block, and the detection gas is buffered and isolated, so that the detection path of the detection device is parallel to the movement direction of the gas to detect the detection gas, light path jitter and influence on detection data in the gas detection process are prevented, and the gas detection data are more stable.

Description

Technical Field

[0001] The invention relates to the technical field of laser gas analysis, in particular to a detection device for laser gas analysis. Background Art

[0002] With the increasing demand for precise gas monitoring in industrial production and the rapid development of science and technology, laser technology has emerged in the field of gas analysis, and detection devices for laser gas analysis have come into being. Relying on advanced laser principles, it integrates precise optical components, highly sensitive detectors and intelligent control systems, and uses stable light sources with precisely controllable wavelengths such as tunable semiconductor lasers to continuously and accurately capture the gas's absorption characteristics of lasers, laying a solid foundation for the subsequent precise analysis of gas composition and concentration.

[0003] The patent application with application number CN201911385740.0 discloses a detection device for laser gas analysis, including a placement shell and a gas analyzer body, the left wall and the right wall of the placement shell are fixedly connected with a fixed plate, the inner side of the fixed plate is slidably connected with a sliding plate, the top of the sliding plate is fixedly connected with a connecting rod, the top of the connecting rod is fixedly connected with a connecting plate, a first spring is arranged on the outside of the connecting rod, and the left and right ends of the gas analyzer body are fixedly connected with guide rails.

[0004] However, the existing laser gas analyzer uses vertical detection. During the vertical detection process, the optical path is easily disturbed by external factors and causes jitter, which leads to deviations in laser transmission and affects the final detection data. It is difficult to reflect the true state of the gas. In addition, the vertical detection method can only focus on a local area of ​​the pipeline and cannot fully cover the entire pipeline cross-section, resulting in the acquired detection data reflecting only one-sided information. It is difficult to fully and accurately present the overall picture of the gas in the pipeline, which greatly limits the comprehensive control of key information such as gas composition and concentration. Summary of the invention

[0005] The object of the present invention is to provide a detection device for laser gas analysis to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a detection device for laser gas analysis, comprising a detection tube, the outer wall of the detection tube is fixedly connected to a connecting tube, the outer wall of the detection tube is fixedly connected to a detection block, the outer wall of the detection tube is fixedly connected to a nitrogen filling tube, the inner wall of the detection tube is fixedly connected to an isolation plate, the outer wall of the isolation plate is provided with a through hole, a buffer mechanism is arranged inside the detection tube, and further comprising: The reversing mechanism is arranged inside the detection tube, and the reversing mechanism includes a reversing block, the outer wall of the reversing block is rotatably connected to the inner wall of the detection tube through a bearing, the outer wall of the reversing block is provided with an injection hole, the inner wall of the reversing block is provided with an assembly groove 1 and an assembly groove 2, the groove wall of the assembly groove 1 is fixedly connected with a lens 1, the groove wall of the assembly groove 2 is fixedly connected with a lens 2, the inner wall of the reversing block is provided with a buffer groove 1, the bottom of the groove wall of the buffer groove 1 is provided with an air inlet hole, the outer wall of the reversing block is fixedly connected with a support block, the outer wall of the reversing block is fixedly connected with an isolation tube, the nitrogen filling tube is used to connect a nitrogen source to flush nitrogen into the injection hole, and the air inlet hole is used to The detection gas is introduced into the interior of the commutation block for detection. The buffer tank is used to buffer the detection gas, so that the commutation block introduces the detection gas into the buffer tank through the air inlet hole to buffer the detection gas, reduce the gas flow rate, prevent the light path jitter during the detection process, and keep the detection gas concentration the same as that outside the commutation block, so that the detection device can stably detect the detection gas, and the detection gas volume is reversed by the commutation block, and the detection gas is buffered and isolated, so that the detection path of the detection device is parallel to the gas movement direction to detect the detection gas, so as to prevent the light path jitter from occurring during the gas detection process, affecting the detection data, and making the gas detection data more stable.

[0007] According to the above technical solution, a connecting hole 1 is provided on the outer wall of the support block, a buffer groove 2 is provided on the outer wall of the support block, a sliding groove is provided on the inner wall of the support block, the sliding groove wall is rotatably connected to the outer wall of the reversing block through a bearing, the outer wall of the isolation tube is fixedly connected to the outer wall of the reversing block, a pressure hole is provided on the outer wall of the isolation tube, the support block is used to support the reversing block, the connecting hole 1 is used to distribute nitrogen to the buffer groove 2, the buffer groove 2 is used to send nitrogen into the jet hole, and the pressure hole is used to discharge the detection gas from the inside of the isolation tube, the reversing block is supported by the support block to ensure that the reversing block stably switches the detection gas, and prevents the reversing block from shaking during the gas reversing process, causing the detection optical path to be unstable and affecting the detection data of the gas, so that the detection gas can be switched stably, the detection gas can be separated by the isolation tube, so that the detection gas inside the isolation tube is in a stable state for detection, and the external airflow is prevented from affecting the optical path, causing the optical path to deviate or shake, affecting the detection data of the gas, and the detection gas can be kept in a stable state for analysis and detection.

[0008] According to the above technical solution, the buffer mechanism includes a support ring, the outer wall of the support ring is rotatably connected to the inner wall of the detection tube through a bearing, the inner wall of the support ring is fixedly connected to a pressure fan, the outer wall of the support ring is provided with a connecting groove, a pressure block is arranged inside the connecting groove, the support ring is used to support the pressure fan, the pressure fan is driven to rotate by the detection gas, and is used to guide the detection gas, the detection gas is guided by the support ring, the detection gas is pressurized, the flow rate of the detection gas is accelerated, a pressure difference is formed with the detection gas in the isolation tube, the detection gas in the isolation tube is extracted, the detection gas in the isolation tube is kept consistent with the external gas concentration, and the stability of gas detection is increased.

[0009] According to the above technical solution, a connecting block is fixedly connected to the outer wall of the pressure block, a pressure groove is opened on the outer wall of the pressure block, a second connecting hole is opened on the groove wall of the pressure groove, and a guide block is fixedly connected to the groove wall of the pressure groove. The pressure block is used to guide and pressurize the detection gas, the pressure groove is used to guide the detection gas, the guide block is used to guide the detection gas, and the second connecting hole is used to extract the detection gas through the pressure hole, and guide and pressurize the detection gas through the pressure block to increase the flow rate of the detection gas, form a pressure difference with the detection gas in the isolation tube, and stably extract the detection gas in the isolation tube, thereby ensuring the circulation of the detection gas in the isolation tube and ensuring the timeliness of gas analysis and detection.

[0010] According to the above technical solution, there are two groups of detection blocks, and the two groups of detection blocks are symmetrically arranged at both ends of the outer wall of the detection tube with the center line of the detection tube as the symmetry axis, and are on the same axis. The group of detection blocks located on the left side of the detection tube is a laser emitting end, and the group of detection blocks located on the right side of the detection tube is a laser receiving end. The jet hole penetrates the outer wall of the commutation block and is connected with the gap between lens one and lens two. The air inlet hole penetrates the outer wall of the commutation block and is connected with the inside of buffer groove one. The through hole penetrates the outer wall of the isolation plate. There are two groups of commutation blocks, and the two groups of commutation blocks are symmetrically arranged on the inner wall of the detection tube with the center line of the detection tube as the symmetry axis. The two groups of commutation blocks are connected by an isolation tube and have the same movement direction. The jet hole is used to spray nitrogen after pressurization to clean lens one and lens two. The enclosed space formed by the gap between lens one and lens two is used to isolate nitrogen from the detection gas. The commutation block is used to buffer the vertical reversal of the detection gas, and the isolation plate is used to buffer and isolate the detection gas after the pressure block is diverted and pressurized.

[0011] According to the above technical solution, the outer wall of the isolation tube is rotatably connected to the inner wall of the isolation plate through a bearing, the outer wall of the isolation tube rotates on the inner wall of the pressure block, the opening position of the pressure hole matches the opening position of the second connecting hole, the first connecting hole penetrates the outer wall of the support block and is connected to the inside of the second buffer groove, the opening position of the second buffer groove matches the position of the jet hole, the number of the support blocks is two groups, the two groups of support blocks are symmetrically arranged inside the detection tube with the center line of the detection tube as the symmetry axis, and the isolation tube is used to isolate the detection gas.

[0012] According to the above technical solution, the buffer mechanism is arranged in the gap of the reversing block, and there are two groups of buffer mechanisms. The two groups of buffer mechanisms are symmetrically arranged inside the detection tube with the center line of the isolation plate as the symmetry axis, and the two groups of buffer mechanisms move in opposite directions. There are two groups of support rings, and the two groups of support rings are symmetrically arranged on the outer wall of the pressure block with the center line of the pressure block as the symmetry axis. The pressure fan gap matches the opening position of the pressure groove, and the pressure fan is used to introduce the detection gas into the pressure groove, and the support ring is used to drive the pressure block to rotate on the inner wall of the detection tube.

[0013] According to the above technical solution, the outer wall of the connecting block is plugged into the wall of the connecting groove, the inner wall of the connecting block rotates on the outer wall of the isolation tube, the guide block is in the shape of a middle protrusion inside the pressure groove, matching the opening position of the second connecting hole, the second connecting hole penetrates the outer wall of the pressure block and is connected to the inside of the pressure groove, the pressure groove penetrates the outer wall of the pressure block in an inclined shape to match the inclination direction of the pressure fan, and the guide block is used to increase the flow rate of the detection gas.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The detection device for laser gas analysis reverses the detection gas volume through a reversing block and buffers and isolates the detection gas, so that the detection path of the detection device is parallel to the gas movement direction to detect the detection gas, thereby preventing optical path jitter from occurring during gas detection and affecting the detection data, and making the gas detection data more stable.

[0015] 2. The detection device for laser gas analysis supports the commutation block by a support block to ensure that the commutation block stably commutates the detection gas and prevents the commutation block from shaking during the gas commutation process, causing the detection optical path to be unstable and affecting the gas detection data, so that the detection gas can be commutated smoothly.

[0016] 3. The detection device for laser gas analysis separates the detection gas through an isolation tube, so that the detection gas inside the isolation tube is in a stable state for detection, preventing external airflow from affecting the optical path, causing the optical path to shift or jitter, affecting the gas detection data, and allowing the detection gas to remain in a stable state for analysis and detection.

[0017] 4. The detection device for laser gas analysis guides the detection gas through a support ring, pressurizes the detection gas, accelerates the flow rate of the detection gas, forms a pressure difference with the detection gas in the isolation tube, extracts the detection gas in the isolation tube, makes the detection gas in the isolation tube consistent with the external gas concentration, and increases the stability of gas detection.

[0018] 5. The detection device for laser gas analysis guides and pressurizes the detection gas through the pressure block, increases the flow rate of the detection gas, forms a pressure difference with the detection gas in the isolation tube, and stably extracts the detection gas in the isolation tube, ensuring the circulation of the detection gas in the isolation tube and the timeliness of gas analysis detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The cross-sectional view of the present invention Figure 1 ; Figure 3 The cross-sectional view of the present invention Figure 2 ; Figure 4 The cross-sectional view of the reversing mechanism of the present invention Figure 1 ; Figure 5 The cross-sectional view of the reversing mechanism of the present invention Figure 2 ; Figure 6 The structure of the buffer mechanism of the present invention is shown in FIG. Figure 1 ; Figure 7 The structure of the buffer mechanism of the present invention is shown in FIG. Figure 2 ; Figure 8 It is a cross-sectional view of the buffer mechanism of the present invention.

[0020] In the figure: 1. detection tube; 101. detection block; 102. connecting tube; 103. nitrogen filling tube; 104. isolation plate; 105. through hole; 2. reversing mechanism; 21. reversing block; 211. lens 1; 212. lens 2; 213. jet hole; 214. buffer slot 1; 215. air inlet; 216. assembly slot 1; 217. assembly slot 2; 22. support block; 221. connecting hole 1; 222. sliding slot; 223. buffer slot 2; 23. isolation tube; 231. pressure hole; 3. buffer mechanism; 31. support ring; 311. pressure fan; 312. connecting slot; 32. pressure block; 321. connecting block; 322. pressure slot; 323. connecting hole 2; 324. guide block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] For example, see Figure 1-Figure 4 The present invention provides a technical solution: a detection device for laser gas analysis, comprising a detection tube 1, a connecting tube 102 is fixedly connected to the outer wall of the detection tube 1, a detection block 101 is fixedly connected to the outer wall of the detection tube 1, a nitrogen filling tube 103 is fixedly connected to the outer wall of the detection tube 1, an isolation plate 104 is fixedly connected to the inner wall of the detection tube 1, a through hole 105 is opened on the outer wall of the isolation plate 104, a buffer mechanism 3 is arranged inside the detection tube 1, and also includes: The reversing mechanism 2 is arranged inside the detection tube 1. The reversing mechanism 2 includes a reversing block 21. The outer wall of the reversing block 21 is rotatably connected to the inner wall of the detection tube 1 through a bearing. The outer wall of the reversing block 21 is provided with an injection hole 213. The inner wall of the reversing block 21 is provided with an assembly groove 1 216 and an assembly groove 217. The groove wall of the assembly groove 1 216 is fixedly connected with a lens 1 211. The groove wall of the assembly groove 217 is fixedly connected with a lens 212. The inner wall of the reversing block 21 is provided with a buffer groove 1 214. The bottom of the groove wall of the buffer groove 1 214 is provided with a An air inlet 215 is provided, a support block 22 is fixedly connected to the outer wall of the reversing block 21, an isolation tube 23 is fixedly connected to the outer wall of the reversing block 21, a nitrogen filling tube 103 is used to connect a nitrogen source, and nitrogen is flushed into the jet hole 213, the air inlet 215 is used to introduce the detection gas into the reversing block 21 for detection, and a buffer tank 214 is used to buffer the detection gas. When the detection device for laser gas analysis is put into use, the connecting pipe 102 is fixedly connected to the outer wall of the pipeline to be detected by the gas, and the detection gas is passed through the connecting pipe 1 02 is introduced into the detection tube 1, and the detection block 101 is started, so that the laser emitting end of the detection block 101 forms a beam with the receiving end. When the detection gas flows into the reversing mechanism 2, the reversing block 21 drives the reversing block 21 to rotate on the inner wall of the detection tube 1 through the gas flow. After the detection gas reversal is completed, it flows into the buffer mechanism 3, and the detection gas is pressurized by the buffer mechanism 3, and the flow rate of the detection gas is increased, so that a pressure difference is generated inside and outside the isolation tube 23, so that the buffer mechanism 3 extracts the detection gas from the inside of the isolation tube 23, and the gas inside the isolation tube 23 is The gas flows through the body, and the detection gas is introduced into the reversing block 21 from the air inlet 215, and the detection gas is buffered by the buffer tank 1 214, so that the detection gas can be stably analyzed and detected. The nitrogen filling pipe 103 is connected to the nitrogen source and introduced into the injection hole 213 through the support block 22, and the nitrogen is rushed into the closed space formed by the lens 1 211 and the lens 2 212 through the injection hole 213, and the lens 1 211 and the lens 2 212 are cleaned to prevent the outer walls of the lens 1 211 and the lens 2 212 from being covered with dust and affecting the detection results; There are two groups of detection blocks 101, which are symmetrically arranged at both ends of the outer wall of the detection tube 1 with the center line of the detection tube 1 as the symmetry axis and are on the same axis. The group of detection blocks 101 located on the left side of the detection tube 1 is a laser emitting end, and the group of detection blocks 101 located on the right side of the detection tube 1 is a laser receiving end. The jet hole 213 penetrates the outer wall of the commutation block 21 and is connected with the gap between the lens 1 211 and the lens 2 212. The air inlet hole 215 penetrates the outer wall of the commutation block 21 and is connected with the inside of the buffer tank 1 214. The through hole 105 penetrates the outer wall of the isolation plate 104. There are two groups of commutation blocks 21, which are symmetrically arranged on the inner wall of the detection tube 1 with the center line of the detection tube 1 as the symmetry axis. The two groups of commutation blocks 21 are connected by the isolation tube 23 and have the same movement direction. The jet hole 213 is used to pressurize nitrogen and spray it out to clean the lens 1 211 and the lens 2 212. The lens 1 211 The enclosed space formed by the gap with the lens 212 is used to isolate nitrogen from the detection gas. The reversing block 21 is used to buffer the vertical reversal of the detection gas. The isolation plate 104 is used to buffer and isolate the detection gas after the pressure block 32 guides and pressurizes the detection gas. After the detection gas reversal is completed, the detection block 101 is started to form a cross-fire between the laser emitting end and the receiving end of the detection block 101, and the gas flows into the buffer mechanism 3. The detection gas is pressurized by the buffer mechanism 3, and the flow rate of the detection gas is increased to generate a pressure difference between the inside and outside of the isolation tube 23, so that the buffer mechanism 3 draws the detection gas out of the isolation tube 23, so that the gas inside the isolation tube 23 circulates. The isolation plate 104 isolates the two groups of buffer mechanisms 3 and connects them through the through hole 105 to prevent the two groups of buffer mechanisms 3 from generating interfering airflow during the process of guiding and pressurizing the detection gas, thereby affecting the buffer mechanism 3 to guide the detection gas.

[0023] Example 2, based on Example 1, please refer to Figure 5The present invention provides a technical solution: a connecting hole 221 is provided on the outer wall of the support block 22, a buffer groove 223 is provided on the outer wall of the support block 22, a sliding groove 222 is provided on the inner wall of the support block 22, the groove wall of the sliding groove 222 is rotatably connected to the outer wall of the reversing block 21 through a bearing, the outer wall of the isolation tube 23 is fixedly connected to the outer wall of the reversing block 21, a pressure hole 231 is provided on the outer wall of the isolation tube 23, the support block 22 is used to support the reversing block 21, and the connecting hole 221 is used to distribute nitrogen to the buffer groove 223 The buffer tank 223 is used to deliver nitrogen into the jet hole 213, and the pressure hole 231 is used to discharge the detection gas from the inside of the isolation tube 23. During the reversing process, the detection gas drives the reversing block 21 to rotate inside the sliding groove 222 opened on the inner wall of the support block 22. The reversing block 21 is supported by the support block 22 to prevent the reversing block 21 from shaking during the reversing process of the detection gas, thereby affecting the detection optical path. The connecting hole 221 opened on the outer wall of the support block 22 is connected to the nitrogen filling pipe 103, and Introduce nitrogen into the buffer tank 223, and through the continuous introduction of nitrogen, the nitrogen is guided to be ejected from the jet hole 213 through the jet hole 213 to clean the lens 1 211 and the lens 2 212 to prevent the lens 1 211 and the lens 2 212 from being contaminated by impurities and affecting the detection results. The detection gas enters the isolation tube 23 through the reversing block 21 through the air inlet hole 215 and then is detected. The isolation tube 23 isolates the inside and outside of the detection gas to prevent the airflow on the outer wall of the isolation tube 23 from disturbing the detection gas inside the isolation tube 23 and affecting the detection results. The external gas of the isolation tube 23 flows inside the detection tube 1, driving the buffer mechanism 3 to rotate on the outer wall of the isolation tube 23, and the pressure and flow rate of the pressurized detection gas inside the buffer mechanism 3 are increased, so that a pressure difference is formed between the inside and outside of the isolation tube 23, so that the detection gas with a lower flow rate inside the isolation tube 23 of the buffer mechanism 3 is extracted from the pressure hole 231, so that the pressure hole 231 and the air inlet hole 215 form a cycle to keep the detection gas concentration inside the isolation tube 23 consistent with that outside. The outer wall of the isolation tube 23 is rotatably connected to the inner wall of the isolation plate 104 through a bearing, and the outer wall of the isolation tube 23 rotates on the inner wall of the pressure block 32. The opening position of the pressure hole 231 matches the opening position of the second connection hole 323. The first connection hole 221 penetrates the outer wall of the support block 22 and is connected to the inside of the second buffer groove 223. The opening position of the second buffer groove 223 matches the position of the jet hole 213. There are two groups of support blocks 22. The two groups of support blocks 22 are symmetrically arranged inside the detection tube 1 with the center line of the detection tube 1 as the symmetry axis. The isolation tube 23 is used to isolate the detection gas. The detection gas enters the isolation tube 23 through the reversing block 21 through the air inlet hole 215 and then enters During detection, the inside of the detection gas is isolated from the outside through the isolation tube 23 to prevent the airflow on the outer wall of the isolation tube 23 from disturbing the detection gas inside the isolation tube 23 and affecting the detection result. The gas outside the isolation tube 23 flows inside the detection tube 1, driving the buffer mechanism 3 to rotate on the outer wall of the isolation tube 23. The pressure and flow rate of the pressurized detection gas inside the buffer mechanism 3 form a pressure difference between the inside and outside of the isolation tube 23, so that the detection gas with a lower flow rate inside the isolation tube 23 of the buffer mechanism 3 is extracted from the pressure hole 231, so that the pressure hole 231 and the air inlet hole 215 form a circulation, and the detection gas concentration inside the isolation tube 23 is kept consistent with that outside.

[0024] Example 3, based on Example 1 and Example 2, please refer to Figure 6-Figure 8 The present invention provides a technical solution: the buffer mechanism 3 includes a support ring 31, the outer wall of the support ring 31 is rotatably connected to the inner wall of the detection tube 1 through a bearing, the inner wall of the support ring 31 is fixedly connected with a pressure fan 311, the outer wall of the support ring 31 is provided with a connecting groove 312, and a pressure block 32 is arranged inside the connecting groove 312. The support ring 31 is used to support the pressure fan 311, and the pressure fan 311 is driven to rotate by the detection gas to guide the detection gas. When the detection gas flowing outside the isolation tube 23 passes through the pressure fan 311, it drives the support ring 31 to rotate on the inner wall of the detection tube 1, and the connection groove 312 provided on the outer wall of the support ring 31 is plugged with the connection block 321, so that the support ring 31 drives the pressure block 32 to rotate in the isolation tube 23. The internal synchronous rotation guides the detection gas through the pressure fan 311, so that the pressure fan 311 drives the detection gas to flow into the pressure groove 322, and the detection gas is guided by the pressure groove 322. The protrusion of the guide block 324 in the pressure groove 322 reduces the flow volume of the detection gas, increases the flow rate and pressure of the detection gas, and makes the gas inside the isolation tube 23 flow into the pressure groove 322 through the pressure hole 231 and the second connecting hole 323, so that the detection gas inside the isolation tube 23 and the detection gas inside the pressure block 32 form a pressure difference, so that the pressure hole 231 and the air inlet hole 215 form a circulation, so that the detection gas inside the isolation tube 23 circulates, and the detection gas concentration inside the isolation tube 23 is consistent with the gas concentration inside the detection tube 1; The outer wall of the pressure block 32 is fixedly connected with a connecting block 321, the outer wall of the pressure block 32 is provided with a pressure groove 322, the groove wall of the pressure groove 322 is provided with a second connecting hole 323, the groove wall of the pressure groove 322 is fixedly connected with a guide block 324, the pressure block 32 is used to guide and pressurize the detection gas, the pressure groove 322 is used to guide the detection gas, the guide block 324 is used to guide the detection gas, the second connecting hole 323 is used to extract the detection gas through the pressure hole 231, and guide the detection gas through the pressure fan 311, so that the pressure fan 311 drives the detection gas to flow into the pressure groove 3 22, the detection gas is guided by the pressure groove 322, and the convex part of the guide block 324 in the pressure groove 322 reduces the flow volume of the detection gas, increases the flow rate and pressure of the detection gas, and makes the gas inside the isolation tube 23 flow into the pressure groove 322 through the pressure hole 231 and the second connecting hole 323, so that the detection gas inside the isolation tube 23 and the detection gas inside the pressure block 32 form a pressure difference, so that the pressure hole 231 and the air inlet hole 215 form a circulation, so that the detection gas inside the isolation tube 23 circulates, and the detection gas concentration inside the isolation tube 23 is consistent with the gas concentration inside the detection tube 1; The buffer mechanism 3 is arranged in the gap of the reversing block 21. There are two groups of buffer mechanisms 3. The two groups of buffer mechanisms 3 are symmetrically arranged inside the detection tube 1 with the center line of the isolation plate 104 as the symmetry axis. The two groups of buffer mechanisms 3 move in opposite directions. There are two groups of support rings 31. The two groups of support rings 31 are symmetrically arranged on the outer wall of the pressure block 32 with the center line of the pressure block 32 as the symmetry axis. The gap of the pressure fan 311 matches the opening position of the pressure groove 322. The pressure fan 311 is used to introduce the detection gas into the pressure groove 322. The support ring 31 is used to drive the pressure block 32 to rotate on the inner wall of the detection tube 1. The two groups of buffer mechanisms 3 are isolated by the isolation plate 104 and connected by the through hole 105 to prevent the detection gases on both sides of the isolation plate 104 from interfering with each other by convection, so that the buffer mechanisms 3 on both sides of the isolation tube 23 can extract the detection gas inside the isolation tube 23, so that the detection gas inside the isolation tube 23 is consistent with the detection gas inside the detection tube 1. The outer wall of the connecting block 321 is plugged into the wall of the connecting groove 312, and the inner wall of the connecting block 321 rotates on the outer wall of the isolation tube 23. The guide block 324 is convex in the middle of the pressure groove 322, which matches the position of the second connecting hole 323. The second connecting hole 323 penetrates the outer wall of the pressure block 32 and is connected to the inside of the pressure groove 322. The pressure groove 322 penetrates the outer wall of the pressure block 32 in an inclined shape and matches the inclined direction of the pressure fan 311. The guide block 324 is used to increase the flow rate of the detection gas, and guides the detection gas through the pressure fan 311, so that the pressure fan 311 drives the detection gas to flow into the pressure groove 322, and guides the detection gas through the pressure groove 322. The raised part of the guide block 324 in the pressure groove 322 reduces the flow volume of the detection gas, increases the flow rate and pressure of the detection gas, and makes the gas inside the isolation tube 23 flow into the pressure groove 322 through the pressure hole 231 and the second connecting hole 323, so that a pressure difference is formed between the detection gas inside the isolation tube 23 and the detection gas inside the pressure block 32, so that the detection gas inside the isolation tube 23 flows into the pressure groove 322 through the pressure hole 231 and the second connecting hole 323, and the gas inside the isolation tube 23 is extracted, and a circulation is formed through the pressure hole 231 and the air inlet hole 215, so that the concentration of the detection gas inside the isolation tube 23 is consistent with the concentration of the detection gas inside the detection tube 1.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection device for laser gas analysis, comprising a detection tube (1), the outer wall of the detection tube (1) being fixedly connected to a connecting tube (102), the outer wall of the detection tube (1) being fixedly connected to a detection block (101), and the outer wall of the detection tube (1) being fixedly connected to a nitrogen filling tube (103), characterized in that: The inner wall of the detection tube (1) is fixedly connected to an isolation plate (104), the outer wall of the isolation plate (104) is provided with a through hole (105), and a buffer mechanism (3) is arranged inside the detection tube (1), and further comprises: A reversing mechanism (2), the reversing mechanism (2) being arranged inside the detection tube (1), the reversing mechanism (2) comprising a reversing block (21), the outer wall of the reversing block (21) being rotatably connected to the inner wall of the detection tube (1) via a bearing, the outer wall of the reversing block (21) being provided with an air injection hole (213), the inner wall of the reversing block (21) being provided with a first assembly groove (216) and a second assembly groove (217), the groove wall of the first assembly groove (216) being fixedly connected to a first lens (211), the groove wall of the second assembly groove (217) being fixedly connected to a second lens (212), The inner wall of the commutation block (21) is provided with a buffer groove 1 (214), the bottom of the groove wall of the buffer groove 1 (214) is provided with an air inlet hole (215), the outer wall of the commutation block (21) is fixedly connected to a support block (22), the outer wall of the commutation block (21) is fixedly connected to an isolation tube (23), the nitrogen filling tube (103) is used to connect to a nitrogen source to inject nitrogen into the injection hole (213), the air inlet hole (215) is used to introduce detection gas into the interior of the commutation block (21) for detection, and the buffer groove 1 (214) is used to buffer the detection gas.

2. A detection device for laser gas analysis according to claim 1, characterized in that: The outer wall of the support block (22) is provided with a first connection hole (221), the outer wall of the support block (22) is provided with a second buffer groove (223), the inner wall of the support block (22) is provided with a sliding groove (222), the groove wall of the sliding groove (222) is rotatably connected to the outer wall of the reversing block (21) through a bearing, the outer wall of the isolation tube (23) is fixedly connected to the outer wall of the reversing block (21), the outer wall of the isolation tube (23) is provided with a pressure hole (231), the support block (22) is used to support the reversing block (21), the first connection hole (221) is used to distribute nitrogen to the second buffer groove (223), the second buffer groove (223) is used to send nitrogen into the gas injection hole (213), and the pressure hole (231) is used to discharge the detection gas from the inside of the isolation tube (23).

3. A detection device for laser gas analysis according to claim 1, characterized in that: The buffer mechanism (3) comprises a support ring (31), the outer wall of the support ring (31) being rotatably connected to the inner wall of the detection tube (1) via a bearing, the inner wall of the support ring (31) being fixedly connected to a pressure fan (311), the outer wall of the support ring (31) being provided with a connection groove (312), a pressure block (32) being arranged inside the connection groove (312), the support ring (31) being used to support the pressure fan (311), the pressure fan (311) being driven to rotate by the detection gas, and being used to guide the detection gas.

4. A detection device for laser gas analysis according to claim 3, characterized in that: The outer wall of the pressure block (32) is fixedly connected to a connecting block (321), the outer wall of the pressure block (32) is provided with a pressure groove (322), the groove wall of the pressure groove (322) is provided with a second connecting hole (323), the groove wall of the pressure groove (322) is fixedly connected to a guide block (324), the pressure block (32) is used to guide and pressurize the detection gas, the pressure groove (322) is used to guide the detection gas, the guide block (324) is used to guide the detection gas, and the second connecting hole (323) is used to extract the detection gas through the pressure hole (231).

5. The detection device for laser gas analysis according to claim 1, characterized in that: The detection blocks (101) are provided in two groups. The two groups of detection blocks (101) are symmetrically arranged at two ends of the outer wall of the detection tube (1) with the center line of the detection tube (1) as the symmetry axis and are located on the same axis. The group of detection blocks (101) located on the left side of the detection tube (1) is a laser emitting end, and the group of detection blocks (101) located on the right side of the detection tube (1) is a laser receiving end. The jet hole (213) penetrates the outer wall of the commutation block (21) and is connected to the gap between the lens 1 (211) and the lens 2 (212). The air inlet hole (215) penetrates the outer wall of the commutation block (21) and is connected to the inside of the buffer groove 1 (214). The through hole (105) penetrates the outer wall of the isolation plate (104). The number of the commutation blocks (21) is two groups. The two groups of commutation blocks (21) are symmetrically arranged on the inner wall of the detection tube (1) with the center line of the detection tube (1) as the symmetry axis. The two groups of commutation blocks (21) are connected by an isolation tube (23) and have the same movement direction. The jet hole (213) is used to spray nitrogen gas after pressurization to clean the lens 1 (211) and the lens 2 (212). The closed space formed by the gap between the lens 1 (211) and the lens 2 (212) is used to isolate the nitrogen gas from the detection gas. The commutation blocks (21) are used to buffer the vertical reversal of the detection gas. The isolation plate (104) is used to buffer and isolate the detection gas after the pressure block (32) guides and pressurizes it.

6. A detection device for laser gas analysis according to claim 2, characterized in that: The outer wall of the isolation tube (23) is rotatably connected to the inner wall of the isolation plate (104) via a bearing, the outer wall of the isolation tube (23) rotates on the inner wall of the pressure block (32), the opening position of the pressure hole (231) matches the opening position of the second connection hole (323), the first connection hole (221) penetrates the outer wall of the support block (22) and communicates with the inside of the second buffer groove (223), the opening position of the second buffer groove (223) matches the position of the gas injection hole (213), the number of the support blocks (22) is two groups, the two groups of support blocks (22) are symmetrically arranged inside the detection tube (1) with the center line of the detection tube (1) as the symmetry axis, and the isolation tube (23) is used to isolate the detection gas.

7. A detection device for laser gas analysis according to claim 3, characterized in that: The buffer mechanism (3) is arranged in the gap of the reversing block (21). The number of the buffer mechanism (3) is two groups. The two groups of the buffer mechanism (3) are symmetrically arranged inside the detection tube (1) with the center line of the isolation plate (104) as the symmetry axis. The two groups of the buffer mechanism (3) move in opposite directions. The number of the support ring (31) is two groups. The two groups of the support ring (31) are symmetrically arranged on the outer wall of the pressure block (32) with the center line of the pressure block (32) as the symmetry axis. The gap of the pressure fan (311) matches the opening position of the pressure groove (322). The pressure fan (311) is used to introduce the detection gas into the pressure groove (322). The support ring (31) is used to drive the pressure block (32) to rotate on the inner wall of the detection tube (1).

8. A detection device for laser gas analysis according to claim 4, characterized in that: The outer wall of the connecting block (321) is plugged into the groove wall of the connecting groove (312); the inner wall of the connecting block (321) rotates on the outer wall of the isolation tube (23); the guide block (324) is in the shape of a middle protrusion inside the pressure groove (322) and matches the position of the second connecting hole (323); the second connecting hole (323) penetrates the outer wall of the pressure block (32) and communicates with the inside of the pressure groove (322); the pressure groove (322) penetrates the outer wall of the pressure block (32) in an inclined shape and matches the inclined direction of the pressure fan (311); the guide block (324) is used to increase the flow rate of the detection gas.

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