Intrinsically safe laser analyzer

Abstract

The invention provides an intrinsically safe laser analyzer, and belongs to the technical field of gas detection, the intrinsically safe laser analyzer comprises an analyzer main body and a gas channel, the analyzer main body comprises a laser emitter, a laser receiver and a detection pipeline, and the intrinsically safe laser analyzer also comprises a gas guide adjusting assembly and a sampling cleaning assembly; opening and closing of the arc-shaped blocking cover can control opening and closing of the gas guide port, the arc-shaped blocking cover is buckled to seal the gas guide port when detection is not carried out, and the influence of the detection pipeline on gas circulation in the gas channel is reduced; the two arc-shaped blocking covers are matched with the elastic wind shielding cloth, so that gases at different heights are guided and mixed, and the accuracy of a detection result is improved; the electromagnet is used for controlling the magnetic ring to move, so that the corrugated sleeve stretches out and draws back to change the size of the internal space, gas suction and discharge and detection in a relatively closed space are achieved, the gas state is relatively stable, and the detection error caused by molecule activity is reduced; and gas entering is not affected, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to an intrinsically safe laser analyzer. Background Art

[0002] In industrial production and environmental monitoring, laser analyzers are often used to detect and analyze the composition of gas, liquid or solid samples. However, in some hazardous environments, such as petrochemical, mining, pharmaceutical and food processing, there may be flammable and explosive gases or dust, which requires the analyzer to have an intrinsically safe design to prevent any electric sparks or thermal effects that may cause an explosion. Intrinsically safe laser analyzers are widely used in flammable and explosive industries such as petroleum, chemical, coal, and pharmaceutical. In these industries, accurate monitoring of gas composition is essential to ensure production safety.

[0003] In the prior art, a detection tube is usually set in the middle of the airflow channel to allow gas to flow in. Different gases have different densities. Since the detection tube is usually only in the middle of the channel, only the gas near this position can be collected, and it is difficult to obtain uniform samples of gases with different densities at the top and bottom of the channel, resulting in the detection results not accurately reflecting the true composition of the overall gas. In addition, when the prior art detects gas, the gas to be tested is in a flowing state, and its molecules are very active. The gas molecules will continuously perform irregular thermal motion and move and diffuse rapidly with the flow of the airflow. This active molecular state makes it difficult for the gas to maintain a relatively stable distribution and concentration during the detection process. For example, when the airflow is unstable, the gas may experience local turbulence or eddy currents, resulting in uneven gas concentration in the detection area, thereby affecting the stability and accuracy of the detection results.

[0004] How to invent an intrinsically safe laser analyzer to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides an intrinsically safe laser analyzer, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that: The present invention provides an intrinsically safe laser analyzer, comprising an analyzer body and a gas channel, wherein the analyzer body comprises a laser transmitter, a laser receiver and a detection pipeline, a side flange pipeline is arranged on the gas channel, one end of the laser transmitter and the laser receiver are respectively provided with a mounting part, and are connected to the side flange pipeline through the mounting part, a light window is arranged inside the mounting part, the detection pipeline is plugged and installed on the gas channel through a side flange pipeline port, the detection pipeline is located between two mounting parts and its end is flush with the flange end of the mounting part, a gas guide port for gas to pass through is opened on the detection pipeline located inside the gas channel, baffles are arranged at both ends of the detection pipeline, and further comprising: Gas guide adjustment component: the gas guide adjustment component is arranged on the detection pipeline and is located at the upper and lower sides of the gas guide port; Sampling and cleaning components: The sampling and cleaning components are arranged in the detection pipeline and are distributed on the left and right sides of the air guide port.

[0007] Preferably, a block is provided on one side of the baffle away from the air guide port, a groove matching the block is provided on the flange end of the mounting portion, and the opening direction of the air guide port is consistent with the gas flow direction.

[0008] Preferably, the air guide adjustment assembly includes an arc-shaped baffle, an elastic windshield cloth, a driving device, and mounting grooves 1 and 2 provided on the detection pipe. An air guide area is provided in the middle of the detection pipe, and the air guide area is in a state of being recessed toward the inner side of the detection pipe, and its inner end is not connected to the inner cavity of the detection pipe. The arc-shaped baffle, the elastic windshield cloth, and the micro electric cylinder are each in two numbers. The two arc-shaped baffles are distributed on the upper and lower sides of the air guide port in a centrally symmetrical manner along the geometric center of the detection pipe, a connecting plate is provided at one end of the arc-shaped baffle, a connecting rod is fixedly connected to the connecting plate, a gear is fixedly connected to the connecting rod located outside the connecting plate, both ends of the gear are respectively rotatably engaged in the side wall of the first mounting groove, a driving device for controlling the rotation of the arc-shaped baffle is provided on the detection pipe, one end of the elastic wind shield cloth is fixed to one side of the arc-shaped baffle cloth facing the air inlet end of the air guide port, and the other end is fixed to the side wall of the air guide area at the air inlet end of the air guide port, one end of the two elastic wind shield cloths away from the arc-shaped baffle covers are respectively distributed on the upper and lower sides of the air inlet end of the air guide port, and an arc-shaped filter plate is installed at the air guide port.

[0009] Preferably, the driving device includes a micro electric cylinder and a rack, the micro electric cylinder is fixedly installed in the second mounting groove, the output end of the micro electric cylinder is fixedly connected to one end of the rack, a through hole matching the output end of the micro electric cylinder and a slide groove for limiting the rack are provided between the first mounting groove and the second mounting groove, the gear is meshed with the rack, the micro electric cylinder and the gear are both located within the outer wall of the detection pipeline, and the micro electric cylinder is electrically connected to the analyzer body.

[0010] Preferably, when the two arc-shaped baffles are buckled together, their outer surfaces are coaxial with the outer wall of the detection pipe and can completely block the air guide port, and the elastic windshield cloth is in an inclined state when the two arc-shaped baffles are away from each other.

[0011] Preferably, the elastic windshield cloth is a thermoplastic polyurethane elastomer film.

[0012] Preferably, the sampling and cleaning assembly includes a corrugated sleeve, a magnetic ring, an annular brush and an electromagnet, a connecting slip ring is provided on the outer side of the magnetic ring, and the magnetic ring is slidingly and sealingly connected to the inner wall of the detection pipe through the connecting slip ring, the electromagnet and one end of the corrugated sleeve are fixed on the baffle, the corrugated sleeve is sleeved on the outer side of the electromagnet, one side of the electromagnet is fixedly connected with a spring, the ends of the corrugated sleeve and the spring away from the baffle are fixed to one side of the magnetic ring, the middle part of the magnetic ring is concavely formed with a conical cylinder, and a sealing groove is provided at one end of the conical cylinder facing the electromagnet, and a light-transmitting plate is clamped and installed in the sealing groove.

[0013] Preferably, an outlet valve is provided on the upper side of the conical cylinder and an inlet valve is provided on the lower side, both the inlet valve and the outlet valve are one-way valves, the light-transmitting plate matches the laser path, the outlet valve and the inlet valve are respectively located on the upper and lower sides of the light-transmitting plate, and the electromagnet and the baffle are provided with holes matching the laser path.

[0014] Preferably, an annular brush is fixedly mounted on the outer side wall of the magnetic ring away from the electromagnet, the bristles of the annular brush abut against the side wall of the arc filter plate, and a drain groove for removing impurities is provided on the bottom wall of the air guide area.

[0015] Preferably, one end of the magnetic ring away from the electromagnet is non-magnetic, and when the electromagnet is energized, the magnetism of the magnetic ring and the opposite surface of the electromagnet on its corresponding side are of the same polarity, the electromagnet is electrically connected to the analyzer body, and the space enclosed by the magnetic ring, the inner cavity of the corrugated sleeve and the mounting part on the corresponding side in the initial state is sealed.

[0016] The beneficial effects of the present invention are: The opening and closing of the arc-shaped cover can control the on and off of the gas outlet. When not testing, the arc-shaped cover is snapped on to close the gas outlet, reducing the impact of the detection pipeline on the gas circulation in the gas channel, and reducing the erosion and corrosion of the internal components of the detection pipeline by the gas, thereby extending the service life of the equipment; the cooperation of the two arc-shaped covers and the elastic windshield cloth can guide the gases at different heights of the gas channel to be mixed in the detection pipeline, solving the problem of unrepresentative samples due to natural stratification of gases in the prior art. After the gases of different densities are fully mixed, the gas samples entering the detection area can more accurately reflect the true composition of the overall gas, thereby improving the accuracy of the test results. At the same time, the elastic windshield cloth is in an inclined state to guide and buffer the gas entering the gas outlet, thereby preventing unstable airflow from affecting the test results and ensuring the stability of the test.

[0017] The movement of the magnetic ring is controlled by an electromagnet, so that the corrugated sleeve can be expanded or contracted to change the size of the internal space. The pressure difference principle and the one-way valve characteristics are used to realize the automatic and orderly entry and discharge of gas into and out of the conical cylinder. When detecting in a relatively closed conical cylinder, the activity range of gas molecules is limited, and a relatively balanced and stable state can be achieved, reducing the detection error caused by molecular activity. The uniformity of the mixed gas guided by the elastic windshield cloth can be better maintained during closed space detection, avoiding concentration stratification or unevenness, and further improving the detection accuracy. The gas intake and discharge process is automatically completed by the pressure difference and the one-way valve. When the magnetic ring moves for gas sampling, the annular brush automatically cleans the arc filter plate without affecting the gas entry. The whole process is efficient and highly automated, which improves the detection efficiency.

[0018] When testing in a relatively closed space, the gas state is relatively stable and the testing conditions are easier to control. As long as the initial conditions in the closed space are the same for each test, relatively consistent test results can be obtained, solving the problem of poor repeatability of test results due to unstable gas state in existing direct sampling, and providing reliable data support for scenarios such as scientific research and industrial production that require multiple tests and comparative analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall installation structure of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention when it is working; Figure 3 It is a schematic rear view of a partial cross-sectional structure of the present invention; Figure 4 The present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a front cross-sectional structural schematic diagram of the present invention; Figure 6 The present invention Figure 5 The enlarged structural diagram at B in the middle; Figure 7 It is a schematic diagram of the structure of the arc-shaped baffle cover and the elastic windshield cloth of the present invention; Figure 8 It is a schematic diagram of the overall structure of the present invention; Fig. 9 It is a schematic structural diagram of the corrugated sleeve of the present invention when it is extended.

[0021] In the figure: 1. Analyzer body; 2. Detection pipeline; 3. Arc-shaped cover; 4. Elastic wind shield cloth; 5. Air guide area; 6. Corrugated sleeve; 7. Magnetic ring; 8. Annular brush; 9. Conical cylinder; 10. Gas channel; 11. Laser transmitter; 12. Laser receiver; 13. Installation part; 21. Installation slot 1; 22. Installation slot 2; 31. Connecting plate; 32. Connecting rod; 33. Micro electric cylinder; 51. Arc-shaped filter plate; 52. Leakage slot; 61. Spring; 71. Connecting slip ring; 72. Electromagnet; 91. Inlet valve; 92. Exit valve; 93. Transparent plate; 94. Sealing groove; 101. Side flange pipeline; 321. Gear; 322. Rack. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0023] Embodiment 1, refer to Figure 1-Figure 4, an intrinsically safe laser analyzer, comprising an analyzer body 1 and a gas channel 10, the analyzer body 1 comprising a laser emitter 11, a laser receiver 12 and a detection pipeline 2, a side flange pipeline 101 is arranged on the gas channel 10, one end of the laser emitter 11 and the laser receiver 12 are respectively installed with a mounting portion 13, and are connected to the side flange pipeline 101 through the mounting portion 13, an optical window is arranged inside the mounting portion 13, the optical window allows the laser to pass smoothly, and at the same time ensures the relative sealing between the detection pipeline 2 and the outside, prevents gas leakage, and ensures the stability of the measurement environment, the detection pipeline 2 is plugged and installed on the gas channel 10 through the port of the side flange pipeline 101, the detection pipeline 2 is located between the two mounting portions 13 and its end is flush with the flange end of the mounting portion 13, a gas guide port for gas to pass through is opened on the detection pipeline 2 located inside the gas channel 10, and baffles are arranged at both ends of the detection pipeline 2, and also includes: Gas guide adjustment component: The gas guide adjustment component is arranged on the detection pipeline 2 and is located at the upper and lower sides of the gas guide port; Sampling and cleaning components: The sampling and cleaning components are arranged in the detection pipeline 2 and are distributed on the left and right sides of the air guide port.

[0024] Furthermore, a block is provided on one side of the baffle away from the gas guide port, and a slot matching the block is provided on the flange end of the mounting portion 13, ensuring that the detection pipeline 2 can be accurately positioned when installed on the mounting portion 13, providing a good foundation for subsequent laser detection and gas circulation. The opening direction of the gas guide port is consistent with the gas flow direction, which can enable more target gases to smoothly enter the detection pipeline 2 through the gas guide port, thereby improving the efficiency and representativeness of gas sampling, thereby more accurately reflecting the actual composition and concentration of the gas to be measured.

[0025] The air guide adjustment component includes an arc-shaped baffle cover 3, an elastic windshield cloth 4, a driving device, and a mounting groove 1 21 and a mounting groove 22 provided on the detection pipe 2. An air guide area 5 is provided in the middle of the detection pipe 2. The air guide area 5 is in a state of being recessed toward the inner side of the detection pipe 2, and its inner end is not connected to the inner cavity of the detection pipe 2. The number of the arc-shaped baffle cover 3, the elastic windshield cloth 4, and the micro electric cylinder 33 are all two. The two arc-shaped baffles 3 are distributed on the upper and lower sides of the air guide port in a centrally symmetrical manner along the geometric center of the detection pipeline 2. A connecting plate 31 is provided at one end of the arc-shaped baffle 3, and a connecting rod 32 is fixedly connected to the connecting plate 31. A gear 321 is fixedly connected to the connecting rod 32 located outside the connecting plate 31, and both ends of the gear 321 are respectively rotatably engaged in the side walls of the mounting groove 21. A driving device for controlling the rotation of the arc-shaped baffle 3 is provided on the detection pipeline 2. One end of the elastic wind shielding cloth 4 is fixed to one side of the arc-shaped baffle 3 facing the air inlet end of the air guide port, and the other end is fixed to the side wall of the air guide area 5 at the air inlet end of the air guide port. One ends of the two elastic wind shielding cloths 4 away from the arc-shaped baffle 3 are respectively distributed on the upper and lower sides of the air inlet end of the air guide port. An arc-shaped filter plate 51 is installed at the air guide port to perform preliminary filtration on the gas entering the air guide port to remove impurity particles in the gas to prevent them from entering the detection pipeline 2 and affecting the detection accuracy or damaging the instrument.

[0026] Furthermore, the driving device includes a micro electric cylinder 33 and a rack 322. The micro electric cylinder 33 is fixedly installed in the second installation groove 22. The output end of the micro electric cylinder 33 is fixedly connected to one end of the rack 322. A through hole matching the output end of the micro electric cylinder 33 and a slide groove for limiting the rack 322 are provided between the first installation groove 21 and the second installation groove 22. The gear 321 is meshed with the rack 322. The micro electric cylinder 33 and the gear 321 are both located within the outer wall of the detection pipeline 2 to avoid interference when the detection pipeline 2 is installed. The micro electric cylinder 33 is electrically connected to the analyzer body 1. The extension and retraction of the micro-electric cylinder 33 is controlled by the analyzer body 1, thereby driving the rack 322 to move. Since the gear 321 is meshed with the rack 322, the gear 321 can be rotated, thereby driving the arc-shaped cover 3 to rotate around the fixed point, thereby realizing the control of the opening and closing angle of the arc-shaped cover 3. During detection, the elastic windshield cloth 4 can be controlled to extend by opening the two arc-shaped covers 3 (the opening amplitude matches the gas channel 10). The extended elastic windshield cloth 4 can guide the gas at different heights of the gas channel 10 into the detection pipeline 2 for certain mixing, thereby improving the representativeness of the gas detection sample.

[0027] It should be noted that when the two arc-shaped baffles 3 are buckled together, their outer surfaces are coaxial with the outer wall of the detection pipe 2 and can completely block the air guide port. Through such a setting, when no detection is required, the air guide port can be closed by buckling the arc-shaped baffles 3, thereby reducing the influence of the existence of the detection pipe 2 on the gas circulation in the gas channel 10. The opening and closing of the two arc-shaped baffles 3 can control the on-off of the air guide port. When it is necessary to adjust the gas flow or stop the gas from entering a specific area of ​​the detection pipe 2, it can be achieved by controlling the relative rotation of the arc-shaped baffles 3. When the two arc-shaped baffles 3 are far away from each other, the elastic windshield cloth 4 is in an inclined state, which can play a certain guiding and buffering role for the gas entering the air guide port. , so that the gas enters the detection pipe 2 more evenly, and at the same time prevents the gas from directly impacting the detection area and affecting the detection results. The elastic windshield 4 is a thermoplastic polyurethane elastomer (TPU) film. TPU is a polymer material with the properties of both rubber and plastic. Its molecular structure contains soft segments and hard segments. The soft segment gives TPU good elasticity, allowing it to undergo large deformation when subjected to force; the hard segment provides a certain rigidity and strength. When stretched by external force, the molecular chain segments in the TPU film can move relatively, thereby stretching the film; when the external force is removed, the molecular chain segments will return to their original state under the action of intermolecular forces, and the film will also return to its initial shape.

[0028] In this embodiment, the laser emitter 11 in the analyzer body 1 emits a laser, and the laser passes through the light window inside the mounting portion 13 and enters the detection pipe 2. In the detection pipe 2, the laser reacts with the gas entering from the gas inlet, and then the laser receiver 12 receives the laser after being acted upon by the gas. By analyzing the changes in the characteristics of the laser, such as light intensity, wavelength, etc., the composition and concentration information of the gas can be obtained (existing technology, which will not be repeated here).

[0029] The gas enters the detection pipeline 2 from the gas channel 10 through the gas guide port opened through the detection pipeline 2. The gas guide adjustment component is responsible for adjusting and controlling the entering gas. The driving device is composed of a micro electric cylinder 33 and a rack 322. When the analyzer body 1 controls the micro electric cylinder 33 to extend and retract, its output end drives the rack 322 to move linearly. Since the gear 321 is meshed with the rack 322, the movement of the rack 322 causes the gear 321 to rotate. The rotation of the gear 321 drives the connecting rod 32 fixedly connected thereto, thereby causing the arc-shaped cover 3 to rotate around the fixed point, thereby achieving precise control of the opening and closing angle of the arc-shaped cover 3. When the arc-shaped cover 3 is opened, the elastic windshield 4 is driven by it to extend; when the arc-shaped cover 3 is closed, the elastic windshield 4 shrinks accordingly. The elastic windshield 4 is made of thermoplastic polyurethane elastomer (TPU) film, and the soft segment in its molecular structure gives good elasticity, and the hard segment provides rigidity and strength. When stretched by external force, the molecular chain segments in the TPU film can move relative to each other, causing the film to stretch; when the external force is removed, the molecular chain segments return to their original shape under the action of intermolecular forces, and the film also returns to its original shape accordingly.

[0030] On the one hand, the light window inside the mounting portion 13 allows the laser to pass smoothly, ensuring that the laser detection process is not obstructed; on the other hand, it ensures that the detection pipeline 2 is relatively sealed with the outside, effectively preventing gas leakage. The stable measurement environment greatly improves the accuracy of the detection results and avoids detection errors caused by interference from external factors.

[0031] When the two arc-shaped baffles 3 are buckled together, they can completely block the gas guide port. When no detection is needed, closing the gas guide port can significantly reduce the impact of the detection channel on the normal circulation of gas in the gas channel 10. At the same time, the operator can also flexibly adjust the gas flow rate or stop the gas from entering a specific area of ​​the detection pipeline 2 by controlling the relative rotation of the arc-shaped baffles 3 to meet different detection requirements and working conditions.

[0032] During the detection process, the two arc-shaped covers 3 are opened, thereby controlling the elastic windshield cloth 4 to stretch. The stretched elastic windshield cloth 4 can guide the gases at different heights of the gas channel 10 into the detection pipe 2 to mix the gases. In this way, the gas samples entering the detection area are more representative and can more accurately reflect the true composition of the gas in the gas channel 10, thereby effectively improving the reliability of the detection.

[0033] It should be noted that when the two arc-shaped covers 3 are far away from each other, the elastic windshield cloth 4 is in an inclined state, which plays a guiding and buffering role for the gas entering the air guide port. This design effectively prevents the gas from directly impacting the detection area at high speed, and avoids the detection results being affected by unstable airflow. In addition, the arc-shaped filter plate 51 at the air guide port performs preliminary filtration on the incoming gas, which can remove the impurity particles therein and prevent these impurities from entering the interior of the detection pipeline 2, avoiding affecting the detection accuracy, while also protecting the instrument and equipment and extending its service life.

[0034] In the prior art, a detection tube is usually set in the middle of the airflow channel to allow gas to flow in. Different gases have different densities. For example, the density of carbon dioxide is greater than that of air, and it tends to sink in a natural state; while the density of hydrogen is smaller than that of air, and it tends to rise. When multiple gases flow in the airflow channel, the gas with high density tends to gather at the bottom of the channel, and the gas with low density is distributed in the upper part of the channel, forming a natural stratification phenomenon. Since the detection tube is usually only in the middle of the channel, it can only collect gas near this position, and it is difficult to obtain uniform samples of gases with different densities at the top and bottom of the channel, resulting in the detection results cannot accurately reflect the true composition of the overall gas.

[0035] In the present embodiment, the two arc-shaped covers 3 are opened to control the stretching of the elastic windshield 4, so that the gas at different heights in the gas channel 10 can be actively guided into the detection pipe 2. Due to the inclined setting of the windshield and its position in the channel, the gas will intersect and collide with each other at different positions during the guiding process, thereby achieving sufficient mixing of gases at different heights, making the gas sample entering the detection pipe 2 more representative, avoiding the collection of gas samples with local characteristics only, and being able to more accurately reflect the true composition of the gas in the channel, thereby making the detection result more reliable.

[0036] When detection is not needed, the arc-shaped cover 3 is fully fastened to completely close the air inlet of the detection pipeline 2 and prevent gas from entering a specific area of ​​the detection pipeline 2. This function is very important in practical applications. It can reduce the interference of the detection pipeline 2 on the normal flow of gas. In industrial production, when the gas detection equipment is temporarily not needed to work, if the air inlet of the detection pipeline 2 cannot be effectively closed, the gas may form local eddies or turbulence in the detection pipeline 2, increase the resistance to gas flow, and affect the efficiency of the entire gas delivery system. The present solution can effectively solve this problem and ensure that the gas flows smoothly and stably in the pipeline.

[0037] Example 2, refer to Figure 3-Figure 9The sampling and cleaning assembly includes a corrugated sleeve 6, a magnetic ring 7, an annular brush 8 and an electromagnet 72. A connecting slip ring 71 is provided on the outer side of the magnetic ring 7. The magnetic ring 7 is slidably sealed and connected to the inner wall of the detection pipe 2 through the connecting slip ring 71, so that the movement process of the magnetic ring 7 is stable and the resistance is small. The electromagnet 72 and one end of the corrugated sleeve 6 are fixed on the baffle. The corrugated sleeve 6 is sleeved on the outer side of the electromagnet 72. A spring 61 is fixedly connected to one side of the electromagnet 72. The ends of the corrugated sleeve 6 and the spring 61 away from the baffle are fixed to one side of the magnetic ring 7. A concave tube 9 is formed in the middle part of the magnetic ring 7. A sealing groove 94 is provided at one end of the conical tube 9 facing the electromagnet 72. A light-transmitting plate 93 is clamped and installed in the sealing groove 94. The sealing groove 94 ensures the sealing of the light-transmitting plate 93 to prevent gas leakage from affecting the detection result. The shape of the conical tube 9 can guide the gas to better gather in the area where the light-transmitting plate 93 is located, so that the laser can interact with the gas more effectively and improve the accuracy of gas detection.

[0038] Furthermore, an outlet valve 92 is provided on the upper side of the conical cylinder 9, and an inlet valve 91 is provided on the lower side. Both the inlet valve 91 and the outlet valve 92 are one-way valves. The inlet valve 91 allows gas to enter the corrugated sleeve 6 for detection, and the outlet valve 92 is used to discharge the gas after detection. The setting of the one-way valve ensures the one-way flow of gas in the corrugated sleeve 6, and there will be no backflow phenomenon, so that the gas can enter and exit the detection area in an orderly manner, thereby improving the accuracy and efficiency of the detection.

[0039] The light-transmitting plate 93 matches the laser path, the air outlet valve 92 and the air inlet valve 91 are respectively located on the upper and lower sides of the light-transmitting plate 93, and the electromagnet 72 and the baffle are provided with holes matching the laser path to ensure that the laser can pass through normally. An annular brush 8 is fixedly installed on the outer wall of the magnetic ring 7 away from the electromagnet 72, and the bristles of the annular brush 8 are against the side wall of the arc filter plate 51. The bottom wall of the gas guide area 5 is provided with a drain groove 52 for removing impurities. The impurity particles cleaned by the annular brush 8 will be discharged from the detection pipeline 2 through the drain groove 52 to prevent impurities from accumulating in the detection pipeline 2 and affecting the gas flow and detection results.

[0040] It should be noted that one end of the magnetic ring 7 away from the electromagnet 72 is non-magnetic. When the electromagnet 72 is energized, the magnetism of the magnetic ring 7 and the opposite surface of the electromagnet 72 on its corresponding side are of the same polarity. The electromagnet 72 is electrically connected to the analyzer body 1. When the electromagnet 72 is energized, the principle of like poles repelling each other is used to push the magnetic ring 7 to slide in the detection pipe 2. The electromagnet 72 is energized and de-energized by the analyzer body 1 to control the movement of the magnetic ring 7, thereby realizing gas sampling and cleaning operations on the arc filter plate 51. When the electromagnet 72 is de-energized, The elastic force of the spring 61 returns the magnetic ring 7 to the initial position, ensuring that the device can work in a cycle. In the initial state, the space enclosed by the magnetic ring 7, the inner cavity of the corrugated sleeve 6 and the mounting portion 13 on the corresponding side is sealed. On the one hand, the corrugated sleeve 6 can protect the electromagnet 72 from erosion by gas and impurities, thereby extending the service life of the electromagnet 72. On the other hand, the corrugated sleeve 6 is retractable and can adapt to the movement of the magnetic ring 7 while maintaining the sealing of the space enclosed by the magnetic ring 7, the inner cavity of the corrugated sleeve 6 and the mounting portion 13 on the corresponding side.

[0041] In this embodiment, when gas sampling is required, the arc-shaped cover 3 is opened, and the analyzer body 1 controls the electromagnet 72 to be energized. The magnetic ring 7 slides in the direction away from the electromagnet 72 under the action of the magnetic force of the same poles repelling each other. At this time, the air inlet valve 91 is opened, and the gas enters the conical cylinder 9. The laser passes through the light-transmitting plate 93 and interacts with the gas for detection. After the detection is completed, the electromagnet 72 is powered off, the spring 61 resets the magnetic ring 7, and the air outlet valve 92 is opened to discharge the detected gas. During the movement of the magnetic ring 7, the annular brush 8 cleans the arc-shaped filter plate 51, which will not affect the entry of the gas. This process is automatically performed during gas sampling. Part of the cleaned impurities slide directly, and the other part is discharged from the leakage groove 52 under the push of the connecting slip ring 71.

[0042] It should be noted that the arc-shaped cover 3 and the setting of its opening and closing angle prevent impurities from accumulating thereon, but are automatically separated under the action of gravity and airflow thrust.

[0043] When the analyzer body 1 controls the electromagnet 72 to be energized, since the electromagnet 72 is energized and the opposite surface of the magnetic ring 7 has the same polarity, the magnetic force of the same polarity repels the magnetic ring 7 to move away from the electromagnet 72. When the magnetic ring 7 moves, the corrugated sleeve 6 connected thereto will be extended, resulting in an increase in the internal space of the corrugated sleeve 6. According to the ideal gas state equation PV=nRT (where P is pressure, V is volume, n is the amount of substance, R is a constant, and T is temperature), when the temperature and the amount of gas substance are relatively stable, the volume V increases and the pressure P decreases, thereby forming a negative pressure environment inside the corrugated sleeve 6. The conical cylinder 9 and the inner part of the corrugated sleeve 6 are in a state of being ... The internal space is connected through a specific channel, and the air inlet valve 91 on the lower side of the conical cylinder 9 is a one-way valve. Since negative pressure is formed in the bellows 6, and the gas in the detection pipeline 2 is in a certain pressure environment, the gas pressure in the detection pipeline 2 is higher than the pressure in the bellows 6 and the conical cylinder 9. Under the action of the pressure difference, the gas tends to flow from the high-pressure area (detection pipeline 2) to the low-pressure area (conical cylinder 9). The force generated by this pressure difference overcomes the opening resistance of the air inlet valve 91, so that the air inlet valve 91 opens, and the gas in the detection pipeline 2 will automatically flow into the conical cylinder 9, realizing the gas intake process, so as to carry out subsequent detection operations.

[0044] After the gas detection is completed, the analyzer body 1 controls the electromagnet 72 to cut off the power. At this time, the spring 61 that was previously stretched under the magnetic force of the electromagnet 72 comes into play. The elastic force of the spring 61 causes the magnetic ring 7 to move in the direction close to the electromagnet 72, driving the corrugated sleeve 6 to return to its initial state, and the internal space of the corrugated sleeve 6 is reduced. According to the ideal gas state equation, when the temperature and the amount of gas substance remain basically unchanged, the volume decreases and the pressure increases, resulting in an increase in the gas pressure in the corrugated sleeve 6 and the conical cylinder 9, which is higher than the gas pressure in the detection pipeline 2. The air outlet valve 92 on the upper side of the conical cylinder 9 is also a one-way valve, and its opening direction is from the conical cylinder 9 to the detection pipeline 2. When the pressure in the conical cylinder 9 increases to a level sufficient to overcome the opening resistance of the air outlet valve 92, the air outlet valve 92 opens. Driven by the pressure difference, the detected gas in the conical cylinder 9 will be discharged into the detection pipeline 2 through the air outlet valve 92, completing the gas discharge process.

[0045] In summary, the movement of the magnetic ring 7 is controlled by the electromagnet 72, so that the corrugated sleeve 6 is expanded and contracted to change the size of the internal space. The pressure difference principle and the characteristics of the one-way valve are utilized to realize the automatic and orderly entry and discharge of the gas into and out of the conical cylinder 9, thereby ensuring the smooth progress of the gas detection process and improving the accuracy and efficiency of the detection.

[0046] In the prior art, the gas to be tested is in a flowing state and its molecules are very active. The gas molecules will continuously perform irregular thermal motion and move and diffuse rapidly with the flow of the airflow. This active molecular state makes it difficult for the gas to maintain a relatively stable distribution and concentration during the detection process. For example, when the airflow is unstable, the gas may have local turbulence or eddy currents, resulting in uneven gas concentration in the detection area, thereby affecting the stability and accuracy of the detection results.

[0047] This solution inputs the mixed gas in Example 1 into a relatively closed space (such as the corrugated sleeve 6) for detection. In this relatively closed environment, the activity range of gas molecules is limited, and the interactions and collisions between molecules are more regular. As time goes by, the gas molecules will gradually reach a relatively balanced state and be more stable as a whole. This stable molecular state helps to improve the stability of detection, so that the detection instrument can more accurately capture the characteristics of the gas and reduce the detection error caused by molecular activity; and the gas has been mixed in Example 1, so that the gas has better uniformity before entering the closed space. When detecting in the closed space, this uniformity can be better maintained, because the flow of gas in the closed space is relatively slow, and concentration stratification or unevenness will not easily occur as in the flowing state. The detection instrument can perform detection in a relatively stable and uniform gas environment, thereby improving the accuracy of detection.

[0048] In addition, the flow state and molecular activity of the gas are higher during direct sampling, and the state of the gas may be different each time the sampling is performed, resulting in poor repeatability of the test results. Gas samples collected at different times and under different conditions may have different concentration distributions and molecular characteristics, resulting in large differences between multiple test results, making it difficult to conduct effective comparison and analysis. This solution conducts detection in a relatively closed space, the gas state is relatively stable, and the detection conditions are easier to control. As long as the initial conditions in the closed space are the same for each test, relatively consistent test results can be obtained, which improves the repeatability of the detection process. This is very important for application scenarios that require multiple tests for comparison and analysis, and can provide more reliable data support for scientific research, industrial production and other fields.

[0049] It should be noted that the specific model specifications of the micro electric cylinder 33 and the electromagnet 72 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intrinsically safe laser analyzer, comprising an analyzer body (1) and a gas channel (10), the analyzer body (1) comprising a laser emitter (11), a laser receiver (12) and a detection pipeline (2), the gas channel (10) being provided with a side flange pipeline (101), one end of each of the laser emitter (11) and the laser receiver (12) being respectively provided with a mounting portion (13) and connected to the side flange pipeline (101) via the mounting portion (13), a light window being provided inside the mounting portion (13), the detection pipeline (2) being plugged and installed on the gas channel (10) via a port of the side flange pipeline (101), the detection pipeline (2) being located between two mounting portions (13) and an end thereof being flush with a flange end of the mounting portion (13), a gas guide port for gas to pass through being provided on the detection pipeline (2) located inside the gas channel (10), baffles being provided at both ends of the detection pipeline (2), characterized in that: Also includes: Gas guide adjustment component: the gas guide adjustment component is arranged on the detection pipeline (2) and is located at the upper and lower sides of the gas guide port; Sampling and cleaning components: the sampling and cleaning components are arranged in the detection pipeline (2) and are distributed on the left and right sides of the air guide port.

2. An intrinsically safe laser analyzer according to claim 1, characterized in that: A clamping block is provided on one side of the baffle away from the air guide port, a clamping groove matching the clamping block is provided at the flange end of the mounting portion (13), and the opening direction of the air guide port is consistent with the direction in which the gas flows.

3. The intrinsically safe laser analyzer according to claim 1, characterized in that: The air guide adjustment component comprises an arc-shaped baffle (3), an elastic windshield cloth (4), a driving device, and a first installation groove (21) and a second installation groove (22) provided on the detection pipe (2); an air guide area (5) is provided in the middle of the detection pipe (2); the air guide area (5) is in a state of being recessed toward the inner side of the detection pipe (2), and its inner end is not connected to the inner cavity of the detection pipe (2); the number of the arc-shaped baffle (3), the elastic windshield cloth (4), and the micro electric cylinder (33) are all two; the two arc-shaped baffles (3) are arranged along the detection pipe (2) The geometric centers are distributed on the upper and lower sides of the air guide port in a centrally symmetrical manner; a connecting plate (31) is provided at one end of the arc-shaped baffle (3); a connecting rod (32) is fixedly connected to the connecting plate (31); a gear (321) is fixedly connected to the connecting rod (32) located outside the connecting plate (31); both ends of the gear (321) are respectively rotatably engaged in the side wall of the first mounting groove (21); a driving device for controlling the rotation of the arc-shaped baffle (3) is provided on the detection pipe (2); one end of the elastic windshield cloth (4) is fixed to one side of the arc-shaped baffle (3) facing the air inlet end of the air guide port, and the other end is fixed to the side wall of the air guide area (5) at the air inlet end of the air guide port; one end of the two elastic windshield cloths (4) away from the arc-shaped baffle (3) are respectively distributed on the upper and lower sides of the air inlet end of the air guide port; and an arc-shaped filter plate (51) is installed at the air guide port.

4. The intrinsically safe laser analyzer according to claim 3, characterized in that: The driving device comprises a micro electric cylinder (33) and a rack (322); the micro electric cylinder (33) is fixedly mounted in the second mounting groove (22); the output end of the micro electric cylinder (33) is fixedly connected to one end of the rack (322); a through hole matching the output end of the micro electric cylinder (33) and a slide groove for limiting the rack (322) are provided between the first mounting groove (21) and the second mounting groove (22); the gear (321) is meshed with the rack (322); the micro electric cylinder (33) and the gear (321) are both located within the outer wall of the detection pipeline (2); and the micro electric cylinder (33) is electrically connected to the analyzer body (1).

5. The intrinsically safe laser analyzer according to claim 3, characterized in that: When the two arc-shaped baffles (3) are locked together, their outer surfaces are coaxial with the outer wall of the detection pipe (2) and can completely block the air guide port. When the two arc-shaped baffles (3) are separated from each other, the elastic windshield cloth (4) is in an inclined state.

6. The intrinsically safe laser analyzer according to claim 3, characterized in that: The elastic windshield cloth (4) is a thermoplastic polyurethane elastomer film.

7. The intrinsically safe laser analyzer according to claim 3, characterized in that: The sampling and cleaning assembly comprises a corrugated sleeve (6), a magnetic ring (7), an annular brush (8) and an electromagnet (72); a connecting slip ring (71) is provided on the outer side of the magnetic ring (7); the magnetic ring (7) is slidably and hermetically connected to the inner wall of the detection pipe (2) via the connecting slip ring (71); the electromagnet (72) and one end of the corrugated sleeve (6) are both fixed on a baffle; the corrugated sleeve (6) is sleeved on the outer side of the electromagnet (72); a spring (61) is fixedly connected to one side of the electromagnet (72); the ends of the corrugated sleeve (6) and the spring (61) away from the baffle are both fixed to one side of the magnetic ring (7); a concave-shaped conical cylinder (9) is formed in the middle of the magnetic ring (7); a sealing groove (94) is provided on one end of the conical cylinder (9) facing the electromagnet (72); a light-transmitting plate (93) is clamped and installed in the sealing groove (94).

8. The intrinsically safe laser analyzer according to claim 7, characterized in that: The conical cylinder (9) is provided with an outlet valve (92) on the upper side and an inlet valve (91) on the lower side; the inlet valve (91) and the outlet valve (92) are both one-way valves; the light-transmitting plate (93) matches the laser path; the outlet valve (92) and the inlet valve (91) are respectively located on the upper and lower sides of the light-transmitting plate (93); and the electromagnet (72) and the baffle are provided with holes that match the laser path.

9. The intrinsically safe laser analyzer according to claim 7, characterized in that: An annular brush (8) is fixedly mounted on the outer wall of the magnetic ring (7) away from the electromagnet (72), the bristles of the annular brush (8) abut against the side wall of the arc-shaped filter plate (51), and a drain groove (52) for draining impurities is provided on the bottom wall of the air guide area (5).

10. The intrinsically safe laser analyzer according to claim 7, characterized in that: One end of the magnetic ring (7) away from the electromagnet (72) is non-magnetic, and when the electromagnet (72) is energized, the magnetism of the magnetic ring (7) and the opposite surface of the electromagnet (72) on its corresponding side are of the same polarity. The electromagnet (72) is electrically connected to the analyzer body (1), and the space enclosed by the magnetic ring (7), the inner cavity of the corrugated sleeve (6) and the mounting portion (13) on the corresponding side in the initial state is sealed.

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