Sulfur hexafluoride non-dispersive infrared spectrum detection device and detection method

Abstract

The invention discloses a sulfur hexafluoride non-dispersive infrared spectrum detection device which comprises a shell, a sample gas chamber is arranged in the shell, an infrared source is arranged on one side of the sample gas chamber, light holes are formed in the two sides of the sample gas chamber at equal intervals, and infrared detectors are arranged on the side, away from the infrared source, of the sample gas chamber at equal intervals. The invention relates to the technical field of gas detection, through the cooperation of the shell, the sample gas chamber, the infrared source, the light hole, the wavelength filter, the infrared detector, the gas guide structure, the sealing structure and the gas supply monitoring assembly, the sealing structure is used for sealing the light hole of the sample gas chamber and filtering the sample gas, so that dust and other impurities are prevented from being sucked into the sample gas chamber, and the detection efficiency is improved. The sulfur hexafluoride detection device has the advantages that the sample gas is collected, the conveying state of the sample gas is monitored, the stable conveying of the sample gas is ensured, the accuracy and stability of a detection result are improved, the service life of the detection device is prolonged, the interference of an external environment on the detection result is effectively avoided, and the sulfur hexafluoride detection device has wide applicability in a severe environment.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and specifically to a sulfur hexafluoride non-dispersive infrared spectroscopy detection device and a detection method. Background Technique

[0002] Sulfur hexafluoride is a colorless, toxic, and flammable gas, and its main component is a substance formed by the combination of sulfur and six fluorine atoms. Sulfur hexafluoride is an important reactant and by-product in many industrial production processes, and is also the main component of some traditional refrigerants and fire extinguishing agents. However, high concentrations of sulfur hexafluoride can cause varying degrees of harm to the human body, such as nausea, vomiting, headache, insomnia, fatigue, etc., and in severe cases, it may even lead to death. Therefore, in application scenarios such as the power industry, environmental protection monitoring, industrial production, and laboratory research, it is necessary to strictly detect and control the content of sulfur hexafluoride in the air to ensure the health and safety of workers and the sustainable development of the environment.

[0003] In the prior art, the sample gas is directly transported to the sample gas chamber of the sulfur hexafluoride detection device, lacking effective filtration treatment, and light-transmitting holes need to be provided on both sides of the sample gas chamber. There is a lack of effective sealing at the light-transmitting holes, which easily allows dust and other impurities to be inhaled into the sample gas chamber or causes blockage of the air inlet, resulting in a greater impact on the accuracy and stability of the detection results, especially in applications in places with long-term deployment or poor air environments, which are greatly restricted. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a sulfur hexafluoride non-dispersive infrared spectroscopy detection device and a detection method, which solve the problem that in actual use, the sample gas is directly transported to the sample gas chamber of the sulfur hexafluoride detection device, lacking effective filtration treatment, and light-transmitting holes need to be provided on both sides of the sample gas chamber. There is a lack of effective sealing at the light-transmitting holes, which easily allows dust and other impurities to be inhaled into the sample gas chamber or causes blockage of the air inlet, resulting in a greater impact on the accuracy and stability of the detection results, especially in applications in places with long-term deployment or poor air environments, which are greatly restricted.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: A sulfur hexafluoride non-dispersive infrared spectroscopy detection device includes a housing. Inside the housing, there is a sample gas chamber. On one side of the sample gas chamber, there is an infrared source. On both sides of the sample gas chamber, light-transmitting holes are equidistantly arranged. On the side of the sample gas chamber far from the infrared source, infrared detectors are equidistantly arranged. On the side where the light-transmitting holes and the infrared detectors are close to each other, there is a wavelength filter. The sulfur hexafluoride non-dispersive infrared spectroscopy detection device also includes a gas guiding structure arranged outside the sample gas chamber; a sealing structure is installed on both sides of the sample gas chamber; a gas supply monitoring component is arranged inside the housing; wherein, filtered sample gas is transported into the sample gas chamber through the gas guiding structure, the sealing structure seals the light-transmitting holes of the sample gas chamber, and the gas supply monitoring component monitors the transportation state of the transported sample gas.

[0006] Preferably, the gas guiding structure includes an air inlet arranged on the outer wall of the sample gas chamber near the infrared source; an air outlet arranged on the outer wall of the sample gas chamber near the infrared detector; a steady-flow brushless vacuum pump arranged outside the sample gas chamber and connected to the air inlet; there are two gas guiding pipes respectively connected to the air inlet, the air outlet and the steady-flow brushless vacuum pump; there are two groups of filtering structures respectively installed on both sides of the outer wall of the housing; there are two groups of outer isolation structures respectively arranged outside the housing; wherein, through the cooperation of the air inlet and the air outlet, the steady-flow brushless vacuum pump and the gas guiding pipes are used to input and output the sample gas into the sample gas chamber, the filtering structure filters dust and other impurities in the sample gas, and the outer isolation structure keeps the transportation of the sample gas stable.

[0007] Preferably, the filtering structure includes inner connectors. There are two inner connectors respectively arranged on both sides of the inner wall of the housing and connected to the inner walls of the gas guiding pipes; there are two outer connectors respectively arranged on both sides of the outside of the housing and threadedly connected to the outer walls of the inner connectors; a filter net is arranged between the inner connectors and the outer connectors; wherein, through the cooperation of the inner connectors and the outer connectors, they are fixed on both sides of the housing and connected to the ends of the two gas guiding pipes, and the filter net filters the transported sample gas.

[0008] Preferably, the outer isolation structure includes fixed connectors. There are two groups of fixed connectors respectively threadedly connected to the outer walls of the outer connectors; an outer flared opening is arranged at the end of the fixed connector far from the housing; a grid plate is arranged inside the outer flared opening; wherein, through the cooperation of the fixed connectors and the outer connectors, the outer flared opening and the grid plate are installed at the end of the outer connector, and the grid plate can isolate and protect the outer connector to prevent large particles from blocking the outer connector.

[0009] Preferably, the gas guiding structure also includes solenoid valves. There are two solenoid valves respectively installed at one ends of the two gas guiding pipes close to the inner connectors.

[0010] Preferably, the closed structure includes a fixed seat. There are multiple fixed seats, which are fixedly connected to the outer wall of the sample gas chamber and are correspondingly arranged with the light-transmitting holes; through holes are opened inside the fixed seats; germanium glass is arranged inside the fixed seats; a sealing structure is arranged outside the germanium glass; wherein, through the cooperation of the fixed seats, the through holes and the germanium glass, the light-transmitting holes are closed, and it is ensured that infrared rays can penetrate the germanium glass and enter the interior of the sample gas chamber, and the sealing structure seals and fixes between the fixed seats and the germanium glass.

[0011] Preferably, the sealing structure includes a limiting groove, which is opened on the side of the fixed seat close to the sample gas chamber; a sealing ring is fitted and connected to the outer wall of the germanium glass and is also fitted and connected to the inner wall of the limiting groove; wherein, through the cooperation of the limiting groove and the sealing ring, the germanium glass is stably installed inside the limiting groove, and the germanium glass seals the light-transmitting holes.

[0012] Preferably, the germanium glass further includes an anti-reflection coating, which is arranged on the side of the outer wall of the germanium glass close to the infrared source.

[0013] Preferably, the air supply monitoring assembly includes a pressure sensor, which is installed on the outer wall of the sample gas chamber and the sensing end is communicated with the sample gas chamber; a gas flowmeter is arranged on the side where the air inlet and the steady-flow brushless vacuum pump are close to each other, and is communicated with one end of the air duct close to the steady-flow brushless vacuum pump; wherein, the pressure sensor monitors the sample gas pressure inside the sample gas chamber, and the gas flowmeter monitors the delivery volume of the sample gas.

[0014] A sulfur hexafluoride non-dispersive infrared spectroscopy detection method includes the following steps:

[0015] S1. Place the sulfur hexafluoride non-dispersive infrared spectroscopy detection device in the environment to be detected, set the parameters of the sample gas detection (such as detection time, detection frequency, sample gas flow rate, etc.) through the control panel of the detection device, and start the detection device;

[0016] S2. When the detection time arrives, the controller automatically controls the solenoid valve and the steady-flow brushless vacuum pump. By sucking the external sample gas into the outer expansion port communicated with it, larger particulate matters in the sample gas are isolated through the grid plate, and secondary filtration is carried out through the filter screen to remove fine impurities such as dust.

[0017] S3. The filtered sample gas is transported to the air inlet through the air duct, so that the sample gas continuously enters the sample gas chamber, replaces the gas in the sample gas chamber, and the delivery flow rate of the sample gas is monitored through the gas flowmeter. After a certain time of transportation, the controller automatically closes the solenoid valve communicated with the air outlet. At the same time, the sample gas pressure inside the sample gas chamber is monitored through the pressure sensor. After the sample gas chamber reaches the set air pressure, the controller automatically closes the solenoid valve and the steady-flow brushless vacuum pump communicated with the air inlet. At this time, the sample gas chamber is kept in a sealed state;

[0018] S4. The controller automatically controls the infrared source to emit infrared light. The infrared light is respectively directed at two germanium glasses and light-transmitting holes located on one side of the air inlet through two groups of reflecting glasses and enters the sample gas chamber, and is emitted through the other two germanium glasses and light-transmitting holes on the other side, forming a double-beam detection channel, that is, a measurement channel and a reference channel. Sulfur hexafluoride in the measurement channel will be absorbed at a rate of 947 cm -1 . The reference channel is not within the absorption range of sulfur hexafluoride. The unabsorbed infrared light is filtered through wavelength filters of different wavelengths to obtain infrared light of different wavelengths, which is received by the infrared detector. The infrared detector converts the received infrared light signal into an electrical signal and transmits it to the control system of the detection device. Finally, the control system calculates the gas concentration of sulfur hexafluoride by measuring the light intensity attenuation value according to Lambert-Beer's law;

[0019] S5. When the gas concentration of sulfur hexafluoride is within the set safe range, the controller emits a normal signal, indicating that the sulfur hexafluoride concentration in the current environment is safe; when the gas concentration of sulfur hexafluoride exceeds the set safe range, the controller emits an alarm signal to promptly remind the operator and take corresponding treatment measures to ensure the safe progress of production or experiments. Moreover, the detection device also has a data recording and storage function and can record various data during the detection process in real time;

[0020] S6. After obtaining the gas concentration data of sulfur hexafluoride, the controller automatically opens the solenoid valve to restore the sample gas chamber to atmospheric pressure and waits for the next detection operation.

[0021] Beneficial effects

[0022] The present invention provides a sulfur hexafluoride non-dispersive infrared spectroscopy detection device and a detection method. It has the following beneficial effects: Through the cooperation among the housing, the sample gas chamber, the infrared source, the light-transmitting holes, the wavelength filters, the infrared detector, the gas guiding structure, the sealing structure, and the gas supply monitoring component, the sealing structure is used to seal the light-transmitting holes of the sample gas chamber and filter the sample gas transported to the sample gas chamber, which can avoid the inhalation of dust and other impurities into the sample gas chamber or cause blockage of the air inlet channel. The gas supply monitoring component is used to monitor the transportation state of the transported sample gas, which can ensure the stable transportation of the sample gas, thereby improving the accuracy and stability of the detection results and the service life of the detection device, and can effectively avoid the interference of the external environment on the detection results, so that the sulfur hexafluoride detection device has a wider applicability in harsh environments.

[0023] Through the cooperation among the housing, the sample gas chamber, the gas guiding structure, and the gas supply monitoring component, the air pressure and the sample gas delivery flow rate in the sample gas chamber are detected by using a pressure sensor and a gas flow meter, which facilitates the staff to grasp the air pressure state in the sample gas chamber in real time. At the same time, the sample gas delivery state can be monitored, and the sample gas pressure can be set to meet the detection requirements under different environments and conditions, which helps to improve the flexibility and applicability of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a schematic external view of the present invention;

[0026] Figure 3 is a schematic external view of the sample gas chamber, the fixed seat, and the air outlet in the present invention;

[0027] Figure 4 is Figure 1 a partial enlarged view of area A in

[0028] Figure 5 is Figure 1 a partial enlarged view of area B in

[0029] Figure 6 is a schematic external cross-sectional view of the fixed seat, the sealing ring, and the germanium glass in the present invention.

[0030] In the figure: 1. Housing; 2. Sample gas chamber; 3. Infrared source; 4. Light-transmitting hole; 5. Wavelength filter; 6. Infrared detector; 7. Gas guiding structure; 8. Sealing structure; 9. Gas supply monitoring component; 71. Air inlet; 72. Air outlet; 73. Steady-flow brushless vacuum pump; 74. Gas duct; 75. Filter structure; 76. Outer isolation structure; 77. Solenoid valve; 751. Inner joint; 752. Outer joint; 753. Filter net; 761. Fixed joint; 762. Outer flared opening; 763. Grid plate; 81. Fixed seat; 82. Through hole; 83. Germanium glass; 84. Sealing structure; 841. Limit groove; 842. Sealing ring; 831. Anti-reflection coating; 91. Pressure sensor; 92. Gas flow meter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In view of this, the present invention provides a sulfur hexafluoride non-dispersive infrared spectroscopy detection device and a detection method, which solve the problems that in actual use, the sample gas is directly transported to the sample gas chamber of the sulfur hexafluoride detection device, lacking effective filtration treatment, and light-transmitting holes need to be arranged on both sides of the sample gas chamber. There is no effective sealing at the light-transmitting holes, which easily allows dust and other impurities to be inhaled into the sample gas chamber or causes blockage of the air inlet, resulting in a greater impact on the accuracy and stability of the detection results, especially in applications in places with long-term layout or poor air environment, which are greatly restricted.

[0033] Those skilled in the art shall connect the components in this case in sequence. For the specific connection and operation sequence, reference should be made to the following working principle. The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process.

[0034] From Figures 1-5 it can be seen that a sulfur hexafluoride non-dispersive infrared spectroscopy detection device includes a housing 1. A sample gas chamber 2 is arranged inside the housing 1. An infrared source 3 is arranged on one side of the sample gas chamber 2. Light-transmitting holes 4 are equally spaced on both sides of the sample gas chamber 2. Infrared detectors 6 are equally spaced on the side of the sample gas chamber 2 away from the infrared source 3. A wavelength filter 5 is arranged on the side where the light-transmitting holes 4 and the infrared detectors 6 are close to each other. The sulfur hexafluoride non-dispersive infrared spectroscopy detection device further includes a gas guiding structure 7, a sealing structure 8 and a gas supply monitoring component 9. The gas guiding structure 7 is arranged outside the sample gas chamber 2; the sealing structure 8 is installed on both sides of the sample gas chamber 2; the gas supply monitoring component 9 is arranged inside the housing 1; wherein, the filtered sample gas is transported into the sample gas chamber 2 through the gas guiding structure 7, the sealing structure 8 seals the light-transmitting holes 4 of the sample gas chamber 2, and the gas supply monitoring component 9 monitors the transportation state of the transported sample gas;

[0035] In the specific implementation process, it is particularly pointed out that through the cooperation between the housing 1, the sample gas chamber 2, the infrared source 3, the light-transmitting holes 4, the wavelength filter 5 and the infrared detectors 6, the infrared source 3 emits infrared light, and the infrared light is respectively incident into the light-transmitting holes 4 through two groups of reflecting glasses and enters the sample gas chamber 2, and is emitted from the other two light-transmitting holes 4, forming a double-beam detection channel inside the sulfur hexafluoride detection device, that is, a measurement channel and a reference channel. In the measurement channel, sulfur hexafluoride will be at 947 cm -1The absorption rate (corresponding to the central wavelength of 10.55 μm), and the reference channel is not within the absorption range of sulfur hexafluoride. The unabsorbed infrared light is filtered by wavelength filters 5 with different wavelengths to obtain infrared light with different wavelengths, which is received by the infrared detector 6. The infrared detector 6 converts the received infrared light signal into an electrical signal and transmits it to the control system of the detection device. Finally, according to Lambert-Beer's law (the output signal of the device is proportional to the amount of infrared light absorption), the gas concentration of sulfur hexafluoride is calculated by measuring the light intensity attenuation value. Through the cooperation among the housing 1, the sample gas chamber 2, the infrared source 3, the light-transmitting hole 4, the wavelength filter 5, the infrared detector 6, the gas guiding structure 7, the sealing structure 8, and the gas supply monitoring component 9, the sealing structure 8 seals the light-transmitting hole 4 of the sample gas chamber 2 and filters the sample gas transported to the sample gas chamber 2 to avoid the inhalation of dust and other impurities into the sample gas chamber 2 or the blockage of the intake channel. The gas supply monitoring component 9 monitors the transportation state of the transported sample gas to ensure the stable transportation of the sample gas, improve the accuracy and stability of the detection result, and the service life of the detection device, effectively avoid the interference of the external environment on the detection result, and make the sulfur hexafluoride detection device have a wider applicability in practical applications. Among them, the specific models of the infrared source 3 and the infrared detector 6 are not limited, as long as they meet the usage requirements;

[0036] Further, the gas guiding structure 7 includes an air inlet 71, an air outlet 72, a steady-flow brushless vacuum pump 73, a gas conduit 74, a filtering structure 75, and an outer isolation structure 76. The air inlet 71 is arranged on one side of the outer wall of the sample gas chamber 2 close to the infrared source 3; the air outlet 72 is arranged on one side of the outer wall of the sample gas chamber 2 close to the infrared detector 6; the steady-flow brushless vacuum pump 73 is arranged outside the sample gas chamber 2 and is communicated with the air inlet 71; there are two gas conduits 74, which are respectively communicated with the air inlet 71, the air outlet 72, and the steady-flow brushless vacuum pump 73; there are two groups of filtering structures 75, which are respectively installed on both sides of the outer wall of the housing 1; there are two groups of outer isolation structures 76, which are respectively arranged outside the housing 1. Among them, through the cooperation of the air inlet 71 and the air outlet 72, the steady-flow brushless vacuum pump 73 and the gas conduit 74 are used to input and output the sample gas into the sample gas chamber 2, the filtering structure 75 filters dust and other impurities in the sample gas, and the outer isolation structure 76 keeps the transportation of the sample gas stable;

[0037] In the specific implementation process, it is particularly worth noting that through the cooperation among the sample gas chamber 2, the air inlet 71, the steady-flow brushless vacuum pump 73, the gas guide pipe 74, the filtering structure 75 and the outer isolation structure 76, an air intake system of the sample gas chamber 2 is formed. By using the negative pressure generated by the steady-flow brushless vacuum pump 73, the external sample gas is introduced into the sample gas chamber 2 through the gas guide pipe 74. During this process, the sample gas first passes through the outer isolation structure 76 to separate large particles in the sample gas, and passes through the filtering structure 75 to filter fine impurities such as dust, ensuring that the sample gas entering the sample gas chamber 2 is pure and free of impurities, and preventing blockage of the intake pipeline, thereby ensuring the stable transportation of the sample gas. Through the cooperation among the sample gas chamber 2, the air outlet 72, the gas guide pipe 74, the filtering structure 75 and the outer isolation structure 76, an exhaust system of the sample gas chamber 2 is formed. The sample gas inside the sample gas chamber 2 is discharged through the air outlet 72 via the gas guide pipe 74, and by arranging the filtering structure 75 and the outer isolation structure 76 at the end of the gas guide pipe 74, dust and large particles are prevented from entering the exhaust pipeline. Among them, the specific model of the steady-flow brushless vacuum pump 73 is not limited, as long as it meets the usage requirements;

[0038] Furthermore, the filtering structure 75 includes an inner joint 751, an outer joint 752 and a filter net 753. There are two inner joints 751, which are respectively arranged on both sides of the inner wall of the outer shell 1 and communicate with the inner wall of the gas guide pipe 74; there are two outer joints 752, which are respectively arranged on both sides of the outside of the outer shell 1 and are threadedly connected to the outer wall of the inner joint 751; the filter net 753 is arranged between the inner joint 751 and the outer joint 752; among them, through the cooperation of the inner joint 751 and the outer joint 752, it is fixed on both sides of the outer shell 1 and communicates with the ends of the two gas guide pipes 74, and the filter net 753 filters the transported sample gas;

[0039] In the specific implementation process, it is particularly worth noting that through the cooperation among the outer shell 1, the inner joint 751, the outer joint 752 and the filter net 753, by connecting the inner joint 751 with the gas guide pipe 74 and screwing and fixing the outer joint 752 with the inner joint 751 outside the outer shell 1, the filter net 753 between the inner joint 751 and the outer joint 752 filters the transported sample gas, preventing impurities such as dust from entering the inside of the sample gas chamber 2 and affecting the purity of the sample gas and the accuracy of the detection results;

[0040] Furthermore, the outer isolation structure 76 includes a fixed joint 761, an outer flared opening 762, and a grid plate 763. There are two groups of fixed joints 761, which are respectively threadedly connected to the outer wall of the outer joint 752. The outer flared opening 762 is arranged at the end of the fixed joint 761 away from the housing 1. The grid plate 763 is arranged inside the outer flared opening 762. Among them, through the cooperation of the fixed joint 761 and the outer joint 752, the outer flared opening 762 and the grid plate 763 are installed at the end of the outer joint 752. The grid plate 763 can isolate and protect the outer joint 752 to prevent large particles from blocking the outer joint 752.

[0041] In the specific implementation process, it is particularly worth noting that through the cooperation among the outer joint 752, the fixed joint 761, the outer flared opening 762, and the grid plate 763, by installing the outer flared opening 762 at the end of the outer joint 752, the grid plate 763 preliminarily filters the sample gas entering the outer joint 752, effectively isolating larger particles in the sample gas, preventing large particles from blocking the outer joint 752 and the filter screen 753, ensuring the smooth transportation of the sample gas. At the same time, it prolongs the service life of the filter screen 753, reduces the replacement frequency, and saves the maintenance cost.

[0042] Furthermore, the gas guiding structure 7 further includes two solenoid valves 77, which are respectively installed at one end of the two gas guiding pipes 74 close to the inner joint 751.

[0043] In the specific implementation process, it is particularly worth noting that the solenoid valves 77 are used to control the on-off of the gas guiding pipes 74, realizing the automatic control of the input and output of the sample gas, improving the detection efficiency and accuracy. When the detection device is not performing monitoring operations, the gas guiding pipes 74 are kept closed to avoid contamination of the gas guiding pipes 74 and the inside of the sample gas chamber 2 by the external environment, ensuring the accuracy of the next detection operation. Among them, the specific model of the solenoid valve 77 is not limited, as long as it meets the usage requirements.

[0044] Furthermore, the sealing structure 8 includes a fixed seat 81, a through hole 82, a germanium glass 83, and a sealing structure 84. There are multiple fixed seats 81, which are fixedly connected to the outer wall of the sample gas chamber 2 and are correspondingly arranged with the light-transmitting holes 4. The through hole 82 is opened inside the fixed seat 81. The germanium glass 83 is arranged inside the fixed seat 81. The sealing structure 84 is arranged outside the germanium glass 83. Among them, through the cooperation of the fixed seat 81, the through hole 82, and the germanium glass 83, the light-transmitting hole 4 is sealed, and it is ensured that infrared rays can penetrate the germanium glass 83 and enter the inside of the sample gas chamber 2. The sealing structure 84 seals and fixes between the fixed seat 81 and the germanium glass 83.

[0045] In the specific implementation process, it is particularly worth noting that through the cooperation among the sample gas chamber 2, the light-transmitting hole 4, the fixing base 81, the through hole 82, the germanium glass 83 and the sealing structure 84, the germanium glass 83 covers the light-transmitting hole 4 through the fixing base 81. At the same time, the sealing structure 84 is used to seal the gap between the germanium glass 83 and the fixing base 81 to ensure the sealing performance of the sample gas chamber 2. At the same time, the germanium glass 83 has good infrared transmittance, which can ensure that infrared light can penetrate smoothly and enter the interior of the sample gas chamber 2, preventing dust and other impurities from entering the interior of the sample gas chamber 2 through the light-transmitting hole 4, and ensuring the accuracy and stability of the detection results and the service life of the detection device;

[0046] Further, the sealing structure 84 includes a limiting groove 841 and a sealing ring 842. The limiting groove 841 is opened on the side of the fixing base 81 close to the sample gas chamber 2; the sealing ring 842 is fitted and connected to the outer wall of the germanium glass 83 and is also fitted and connected to the inner wall of the limiting groove 841. Among them, through the cooperation of the limiting groove 841 and the sealing ring 842, the germanium glass 83 is stably installed inside the limiting groove 841, and the germanium glass 83 seals the light-transmitting hole 4;

[0047] In the specific implementation process, it is particularly worth noting that through the cooperation among the sample gas chamber 2, the light-transmitting hole 4, the fixing base 81, the germanium glass 83, the limiting groove 841 and the sealing ring 842, the sealing ring 842 outside the germanium glass 83 is snapped into the limiting groove 841 to realize the limiting and fixing of the germanium glass 83, preventing the germanium glass 83 from shaking or shifting, and sealing the gap between the sample gas chamber 2 and the germanium glass 83 to prevent dust and other impurities from entering the interior of the sample gas chamber 2 through the gap between the sample gas chamber 2 and the germanium glass 83;

[0048] Further, the germanium glass 83 further includes an anti-reflection coating 831, and the anti-reflection coating 831 is arranged on the side of the outer wall of the germanium glass 83 close to the infrared source 3;

[0049] In the specific implementation process, it is particularly worth noting that the anti-reflection coating 831 can reduce the reflection of infrared light on the surface of the germanium glass 83, increase the transmittance of infrared light, thereby increasing the intensity of the infrared light signal received by the infrared detector 6, and further improving the accuracy and sensitivity of the detection results;

[0050] Further, the air supply monitoring component 9 includes a pressure sensor 91 and a gas flow meter 92. The pressure sensor 91 is installed on the outer wall of the sample gas chamber 2, and the sensing end is communicated with the sample gas chamber 2; the gas flow meter 92 is arranged on the side where the air inlet 71 and the steady-flow brushless vacuum pump 73 are close to each other, and is communicated with one end of the air guide pipe 74 close to the steady-flow brushless vacuum pump 73. Among them, the pressure sensor 91 monitors the sample gas pressure inside the sample gas chamber 2, and the gas flow meter 92 monitors the delivery volume of the sample gas;

[0051] In the specific implementation process, it is particularly worth noting that the pressure sensor 91 is used to detect the air pressure in the sample gas chamber 2 and transmit the detection signal to the control system of the detection device, facilitating the staff to grasp the air pressure state in the sample gas chamber 2 in real time, ensuring the accuracy of the detection results, and being able to set the sample gas pressure to meet the detection requirements under different environments and conditions. The gas flow meter 92 accurately monitors the delivery volume of the sample gas and transmits the monitoring data to the control system of the detection device, enabling the staff to accurately understand the delivery state of the sample gas and ensuring the stable delivery of the sample gas. At the same time, through the real-time monitoring of the sample gas delivery state, an alarm can be issued in a timely manner when the sample gas delivery is abnormal, reminding the staff to check and maintain, avoiding errors in the detection results and damage to the detection device, and further improving the reliability and safety of the detection device. Among them, the specific models of the pressure sensor 91 and the gas flow meter 92 are not limited, as long as they meet the usage requirements.

[0052] Working principle:

[0053] Place the sulfur hexafluoride non-dispersive infrared spectroscopy detection device in the environment to be detected. Set the parameters for sample gas detection (such as detection time, detection frequency, and sample gas flow rate, etc.) through the control panel of the detection device, and start the detection device. When the detection time arrives, the controller automatically controls the solenoid valve and the steady-flow brushless vacuum pump. By sucking the external sample gas into the externally extended port connected to it, the larger particulate matter in the sample gas is isolated through the grid plate, and secondary filtration is carried out through the filter screen to remove fine impurities such as dust. The filtered sample gas is transported to the air inlet through the air duct, enabling the sample gas to be continuously transported into the sample gas chamber, replacing the gas in the sample gas chamber, and monitoring the delivery flow rate of the sample gas through the gas flow meter. After being transported for a certain time, the controller automatically closes the solenoid valve connected to the air outlet. At the same time, the pressure sensor monitors the sample gas pressure inside the sample gas chamber. After the sample gas chamber reaches the set air pressure, the controller automatically closes the solenoid valve and the steady-flow brushless vacuum pump connected to the air inlet. At this time, the sample gas chamber remains in a sealed state. The controller automatically controls the infrared source to emit infrared light. The infrared light is respectively emitted to the two germanium glasses and the light-transmitting holes on the side of the air inlet through two groups of reflection glasses and enters the sample gas chamber, and is emitted by the other two germanium glasses and the light-transmitting holes on the other side, forming a double-beam detection channel, that is, the measurement channel and the reference channel. In the measurement channel, sulfur hexafluoride will be at 947 cm -1The rate of absorption (corresponding to the central wavelength of 10.55 μm), and the reference channel is not within the absorption range of sulfur hexafluoride. The unabsorbed infrared light is filtered by wavelength filters of different wavelengths to obtain infrared light of different wavelengths, which is received by an infrared detector. The infrared detector converts the received infrared light signal into an electrical signal and transmits it to the control system of the detection device. Finally, according to Lambert-Beer's law (the output signal of the device is proportional to the amount of infrared light absorption), the control system calculates the gas concentration of sulfur hexafluoride by measuring the light intensity attenuation value. When the gas concentration of sulfur hexafluoride is within the set safe range, the controller sends a normal signal indicating that the sulfur hexafluoride concentration in the current environment is safe; when the gas concentration of sulfur hexafluoride exceeds the set safe range, the controller sends an alarm signal to promptly remind the operator and take corresponding treatment measures to ensure the safe progress of production or experiments. Moreover, the detection device also has a data recording and storage function, which can record various data during the detection process in real time. After obtaining the gas concentration data of sulfur hexafluoride, the controller automatically opens the solenoid valve to restore the sample gas chamber to the atmospheric pressure state and waits for the next detection operation.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0055] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "setting", "connection", "fixation", "swivel connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sulfur hexafluoride non-dispersive infrared spectrum detection device, comprising a housing (1), characterized in that: A sample gas chamber (2) is arranged inside the housing (1), an infrared source (3) is arranged on one side of the sample gas chamber (2), light transmission holes (4) are arranged at equal distances on both sides of the sample gas chamber (2), an infrared detector (6) is arranged at equal distances on the side of the sample gas chamber (2) away from the infrared source (3), and a wavelength filter (5) is arranged on the side where the light transmission hole (4) and the infrared detector (6) are close to each other. The sulfur hexafluoride non-dispersive infrared spectrum detection device also includes: An air guide structure (7) is arranged outside the sample air chamber (2); A closed structure (8) is installed on both sides of the sample gas chamber (2); A gas supply monitoring component (9) is arranged inside the housing (1); The filtered sample gas is transported into the sample gas chamber (2) via the gas guide structure (7), the sealing structure (8) seals the light-transmitting hole (4) of the sample gas chamber (2), and the gas supply monitoring component (9) monitors the transport status of the transported sample gas.

2. A sulfur hexafluoride non-dispersive infrared spectrum detection device according to claim 1, characterized in that: The air guide structure (7) comprises: An air inlet (71) is arranged on a side of the outer wall of the sample air chamber (2) close to the infrared source (3); An air outlet (72) is arranged on a side of the outer wall of the sample air chamber (2) close to the infrared detector (6); A steady-flow brushless vacuum pump (73) is arranged outside the sample gas chamber (2) and is connected to the gas inlet (71); Two air guide pipes (74) are provided, which are respectively connected to the air inlet (71), the air outlet (72) and the steady-flow brushless vacuum pump (73); The filtering structure (75) is provided in two groups and is respectively installed on both sides of the outer wall of the housing (1); Two groups of external isolation structures (76) are respectively arranged on the outside of the housing (1); The air inlet (71) and the air outlet (72) cooperate with each other, and the steady-flow brushless vacuum pump (73) and the air guide tube (74) are used to input and output the sample gas into and from the sample gas chamber (2); the filter structure (75) filters dust and other impurities in the sample gas; and the external isolation structure (76) ensures that the sample gas delivery remains stable.

3. A sulfur hexafluoride non-dispersive infrared spectrum detection device according to claim 2, characterized in that: The filtering structure (75) comprises: Two inner joints (751) are provided, which are respectively arranged on both sides of the inner wall of the outer shell (1) and are connected to the inner wall of the air guide pipe (74); Two external joints (752) are provided, which are respectively arranged on two sides of the outside of the outer shell (1) and are threadedly connected to the outer wall of the internal joint (751); A filter screen (753) is disposed between the inner connector (751) and the outer connector (752); Wherein, through the cooperation of the inner joint (751) and the outer joint (752), it is fixed to both sides of the outer shell (1) and is connected to the ends of the two air guide tubes (74), and the filter screen (753) filters the transported sample gas.

4. A sulfur hexafluoride non-dispersive infrared spectrum detection device according to claim 3, characterized in that: The outer isolation structure (76) comprises: The fixed joints (761) are provided in two groups and are respectively threadedly connected to the outer wall of the external joint (752); An external flared opening (762) is arranged at an end of the fixed joint (761) away from the housing (1); A mesh plate (763) is arranged inside the outer expansion opening (762); Wherein, through the cooperation of the fixed joint (761) and the external joint (752), the external expansion port (762) and the mesh plate (763) are installed at the end of the external joint (752), and the mesh plate (763) can form isolation and protection for the external joint (752) to prevent large particles from clogging the external joint (752).

5. The non-dispersive infrared spectrum detection device for sulfur hexafluoride according to claim 2, characterized in that: The air guide structure (7) further comprises: Two solenoid valves (77) are provided and are respectively installed at one end of the two air guide pipes (74) close to the inner joint (751).

6. The non-dispersive infrared spectrum detection device for sulfur hexafluoride according to claim 1, characterized in that: The closed structure (8) comprises: A plurality of fixing seats (81) are provided, fixedly connected to the outer wall of the sample gas chamber (2), and arranged corresponding to the light transmission holes (4); A through hole (82) is formed inside the fixing seat (81); Germanium glass (83), arranged inside the fixing seat (81); A sealing structure (84) is arranged on the outer side of the germanium glass (83); The fixing seat (81), the through hole (82) and the germanium glass (83) cooperate to form a seal on the light-transmitting hole (4), and ensure that infrared rays can penetrate the germanium glass (83) and enter the interior of the sample gas chamber (2). The sealing structure (84) seals and fixes the fixing seat (81) and the germanium glass (83).

7. A sulfur hexafluoride non-dispersive infrared spectrum detection device according to claim 6, characterized in that: The sealing structure (84) comprises: A limiting groove (841) is provided on a side of the fixing seat (81) close to the sample gas chamber (2); A sealing ring (842) is connected to the outer wall of the germanium glass (83) and to the inner wall of the limiting groove (841); Wherein, through the cooperation of the limiting groove (841) and the sealing ring (842), the germanium glass (83) is stably installed inside the limiting groove (841), and the germanium glass (83) forms a seal with the light transmission hole (4).

8. The non-dispersive infrared spectrum detection device for sulfur hexafluoride according to claim 6, characterized in that: The germanium glass (83) further comprises: The anti-reflection coating (831) is arranged on a side of the outer wall of the germanium glass (83) close to the infrared source (3).

9. The non-dispersive infrared spectrum detection device for sulfur hexafluoride according to claim 2, characterized in that: The gas supply monitoring component (9) comprises: A pressure sensor (91) is mounted on the outer wall of the sample gas chamber (2), and a sensing end is connected to the sample gas chamber (2); A gas flow meter (92) is arranged on a side where the air inlet (71) and the steady-flow brushless vacuum pump (73) are close to each other, and is connected to an end of the air guide pipe (74) close to the steady-flow brushless vacuum pump (73); The pressure sensor (91) monitors the sample gas pressure inside the sample gas chamber (2), and the gas flow meter (92) monitors the delivery volume of the sample gas.

10. A non-dispersive infrared spectrum detection method for sulfur hexafluoride, characterized in that: The following steps are involved: S1. Place the sulfur hexafluoride non-dispersive infrared spectrum detection device in the environment where the detection is required, set the parameters of the sample gas detection through the control panel of the detection device, and start the detection device; S2. When the detection time is reached, the controller automatically controls the solenoid valve (77) and the steady-flow brushless vacuum pump (73), and inhales the external sample gas into the external expansion port (762) connected thereto, isolates the larger particles in the sample gas through the mesh plate (763), and performs secondary filtration through the filter screen (753) to remove fine impurities such as dust; S3. The filtered sample gas is delivered to the air inlet (71) through the air guide tube (74), so that the sample gas is continuously delivered to the sample gas chamber (2), the gas in the sample gas chamber (2) is replaced, and the delivery flow of the sample gas is monitored by the gas flow meter (92). After being delivered for a certain period of time, the controller automatically closes the solenoid valve (77) connected to the air outlet (72). At the same time, the sample gas pressure inside the sample gas chamber (2) is monitored by the pressure sensor (91). After the sample gas chamber (2) reaches the set air pressure, the controller automatically closes the solenoid valve (77) connected to the air inlet (71) and the steady-flow brushless vacuum pump (73), and the sample gas chamber (2) remains sealed at this time; S4. The controller automatically controls the infrared source (3) to emit infrared light. The infrared light passes through two sets of reflective glass and is respectively directed to the two germanium glasses (83) and the light-transmitting hole (4) located on one side of the air inlet (71). The infrared light enters the sample gas chamber (2) and is emitted from the two germanium glasses (83) and the light-transmitting hole (4) on the other side, forming a double-beam detection channel, namely a measurement channel and a reference channel. The sulfur hexafluoride in the measurement channel is detected at 947 cm -1 The reference channel is not within the absorption range of sulfur hexafluoride, and the unabsorbed infrared light is filtered by wavelength filters (5) of different wavelengths to obtain infrared light of different wavelengths, which are received by the infrared detector (6). The infrared detector (6) converts the received infrared light signal into an electrical signal and transmits it to the control system of the detection device. Finally, the control system calculates the gas concentration of sulfur hexafluoride by measuring the light intensity attenuation value according to the Lambert-Beer law. S5. When the gas concentration of sulfur hexafluoride is within the set safety range, the controller sends a normal signal, indicating that the concentration of sulfur hexafluoride in the current environment is safe; when the gas concentration of sulfur hexafluoride exceeds the set safety range, the controller sends an alarm signal to promptly remind the operator to pay attention and take corresponding treatment measures to ensure the safety of production or experiments. In addition, the detection device also has data recording and storage functions, which can record various data in the detection process in real time; S6. After obtaining the gas concentration data of sulfur hexafluoride, the controller automatically opens the solenoid valve (77) to restore the sample gas chamber (2) to the atmospheric pressure state and wait for the next detection operation.

Images