Ultraviolet method total sulfur analyzer based on continuous sample injection

Abstract

The invention discloses an ultraviolet method total sulfur analyzer based on continuous sample introduction, which comprises an analyzer main body, the analyzer main body is internally provided with a continuous feeding unit capable of replacing a filter element in a non-stop state, and the output end of the continuous feeding unit is provided with a feeding switching unit for stabilizing the pressure of output gas. The continuous feeding unit comprises a feeding guide pipe arranged in the analyzer main body; the pre-tightening force of the spring is adjusted through the threaded rod, and the target output air pressure range of the pressure adjusting valve is preset; in the working process, when the gas pressure reaches a set interval, the gas inlet channel is automatically opened, so that gas enters the analyzer at stable pressure to complete detection; and when the gas pressure exceeds a set range, the pressure regulating valve automatically opens the pressure relief channel to discharge redundant gas, so that the pressure fluctuation is inhibited. According to the mechanism, fine adjustment and self-adaptive stable control on the pressure of the sample gas are realized, and the reliability and consistency of the detection process on the pressure condition are ensured.

Description

Technical Field

[0001] This invention relates to the field of ultraviolet (UV) total sulfur analyzer technology, and more specifically to a UV total sulfur analyzer based on continuous sample injection. Background Technology

[0002] The ultraviolet (UV) total sulfur analyzer utilizes the principle of ultraviolet fluorescence to convert sulfur in a sample into sulfur dioxide, which is then excited by ultraviolet light to produce fluorescence. The total sulfur content is determined by detecting the fluorescence intensity. Its significance lies in its ability to accurately and rapidly analyze the sulfur content in various samples, such as petroleum, chemical products, environmental water samples, and gases. This provides crucial data support for quality control in the petrochemical industry, sulfur pollution monitoring and control in environmental protection, and related scientific research, playing a vital role in ensuring product quality and protecting the ecological environment.

[0003] In existing UV total sulfur analyzers, a single filter cartridge is typically used to filter the sample gas. This cartridge cannot be replaced without shutting down the system. If the cartridge becomes clogged or needs replacement, the equipment must be stopped, interrupting the detection process, reducing efficiency, and affecting the continuity of production or experiments. Furthermore, current technology lacks precise and flexible pressure regulation and relief mechanisms for gas pressure control. Fluctuations in gas pressure can easily affect the accuracy of the test results. In addition, during equipment maintenance, the sample inlet path is often not effectively cleaned, and residual gas samples may interfere with subsequent detections, limiting the analyzer's efficient and stable operation.

[0004] Therefore, it is necessary to design a continuous feeding unit that allows for filter replacement without shutting down the system, enabling online replacement of the filter during operation. This unit, along with a feeding switching unit, allows for flexible control of the sample inlet path and gas pressure, while also cleaning idle paths. Furthermore, a precise pressure regulation and depressurization structure is incorporated into the pressure regulating valve to ensure the stability of the output gas pressure, thereby improving the overall performance of the analyzer. To address these issues, we offer a UV-based total sulfur analyzer based on continuous sample inlet. Summary of the Invention

[0005] The purpose of this invention is to provide a UV-based total sulfur analyzer based on continuous sample injection, in order to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A UV-based total sulfur analyzer based on continuous sample injection includes an analyzer body. The analyzer body is equipped with a continuous feeding unit that allows for filter replacement without shutting down the system. The output end of the continuous feeding unit is equipped with a feeding switching unit for stabilizing the output gas pressure.

[0008] The continuous feeding unit includes a feed conduit inside the analyzer body, a movable filter element support inside the feed conduit that allows filter element replacement without leakage, and an auxiliary filter tube at the output end of the feed conduit for filtering gas during filter element replacement.

[0009] The feeding switching unit includes a pressure regulating valve installed at the output end of the continuous feeding unit for adjusting the output gas pressure, a regulating valve installed at the output end of the pressure regulating valve for adjusting the gas delivery pipeline, and a one-way valve core installed inside the regulating valve for isolating.

[0010] A further improvement of the technical solution of the present invention is that: a limiting groove is provided inside the feed conduit, a limiting slider is fixedly connected to the side of the movable filter element bracket, and the limiting slider is slidably connected inside the limiting groove.

[0011] A further improvement of the technical solution of the present invention is that: a limiting rod is fixedly connected to the side of the movable filter element bracket, the limiting rod is engaged inside the side of the feed conduit, a limiting block is fixedly connected inside the movable filter element bracket, and a detachable filter element is engaged inside the movable filter element bracket.

[0012] A further improvement of the technical solution of the present invention is that: a permanent filter element support is slidably connected to the inside of the side of the auxiliary filter tube, a permanent filter element is movably connected inside the permanent filter element support, and an air supply pipe is fixedly connected to the output end of the auxiliary filter tube.

[0013] A further improvement of the technical solution of the present invention is that: a fixed bracket is fixedly connected to the outer surface of the regulating valve, an air inlet pipe is fixedly connected to the output end of the regulating valve, and an adjusting gear is rotatably connected to the inside of the side of the regulating valve.

[0014] A further improvement of the technical solution of the present invention is that: a drive rack is slidably connected inside the fixed bracket, a hydraulic telescopic rod is fixedly connected to the other end of the fixed bracket, the output end of the hydraulic telescopic rod is fixedly connected to the middle of the drive rack, and the adjusting gear meshes with the drive rack.

[0015] A further improvement of the technical solution of the present invention is that: the one-way valve core is rotatably connected inside the regulating valve, and one end of the one-way valve core passes through the side of the regulating valve and is fixedly connected to the regulating gear.

[0016] A further improvement of the technical solution of the present invention is that: the pressure regulating valve is fixedly connected to the input end of the regulating valve, a one-way valve is fixedly connected to one end of the inside of the pressure regulating valve, and a threaded rod is threadedly connected to the inside of the side of the pressure regulating valve.

[0017] A further improvement of the technical solution of the present invention is that: a push plate is rotatably connected to one end of the outer surface of the threaded rod, the push plate is slidably connected inside the pressure regulating valve, and a spring is fixedly connected to the side of the push plate.

[0018] A further improvement of the technical solution of the present invention is that: a sealing baffle is fixedly connected to the other end of the spring, a high-pressure baffle is fixedly connected to the side of the sealing baffle, a pressure relief port is opened on the top surface of the pressure regulating valve, and a feed pipe is fixedly connected to the bottom surface of the pressure regulating valve.

[0019] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0020] 1. This invention provides a UV-based total sulfur analyzer based on continuous sample injection. The sample gas undergoes two stages of filtration—a removable filter and a permanent filter—before entering the subsequent analysis unit. When the permeability of the removable filter decreases, the gas path is temporarily closed by the displacement of the movable filter support, allowing the permanent filter to independently undertake the filtration task for a short period. This allows the operator to replace the removable filter online. After replacement, the gas path automatically recovers, achieving stable filtration without affecting continuous gas input and analysis operations, thus ensuring the continuity and reliability of the detection process.

[0021] 2. This invention provides a UV-based total sulfur analyzer based on continuous sample injection. When one feed path is in operation, a hydraulically driven regulating valve opens, allowing filtered and pressurized gas to enter the analyzer at a stable pressure for detection. Simultaneously, the other feed path remains closed, allowing filter replacement without shutting down the analyzer. Residual gas samples are discharged through the introduction of high-pressure gas into this path and the automatic pressure relief function of the regulating valve, achieving online cleaning of the channel. This alternating switching method ensures the continuity of the detection process while avoiding interference from residual gas in subsequent test results.

[0022] 3. This invention provides a UV-based total sulfur analyzer based on continuous sample injection. The target output gas pressure range of the pressure regulating valve is preset by adjusting the preload of the spring on a threaded rod. During operation, when the gas pressure reaches the set range, the inlet channel automatically opens, allowing gas to enter the analyzer at a stable pressure for detection. When the gas pressure exceeds the set range, the pressure regulating valve automatically opens the pressure relief channel to discharge excess gas, thereby suppressing pressure fluctuations. This mechanism achieves precise adjustment and adaptive stable control of the sample gas pressure, ensuring the reliability and consistency of gas pressure conditions during the detection process. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2This is a schematic diagram of the continuous feeding unit of the present invention;

[0025] Figure 3 For the present invention Figure 2 Schematic diagram of the central feed duct;

[0026] Figure 4 For the present invention Figure 2 Schematic diagram of the auxiliary filter tube in the middle;

[0027] Figure 5 This is a schematic diagram of the feeding switching unit of the present invention;

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the regulating valve;

[0029] Figure 7 For the present invention Figure 6 Schematic diagram of the cooperation structure between the regulating valve and the one-way valve core;

[0030] Figure 8 For the present invention Figure 5 Cross-sectional view of the central air intake pipe;

[0031] In the diagram: 1. Analyzer body; 2. Continuous feeding unit; 21. Feed conduit; 22. Auxiliary filter tube; 23. Movable filter element support; 24. Permanent filter element support; 25. Limiting slider; 26. Limiting groove; 27. Limiting block; 28. Removable filter element; 29. ​​Limiting lever; 210. Air supply pipe; 211. Permanent filter element; 3. Feed switching unit; 31. Fixed bracket; 32. Regulating valve; 33. Pressure regulating valve; 34. Air inlet pipe; 35. Adjusting gear; 36. Drive rack; 37. Hydraulic telescopic rod; 38. One-way valve core; 39. Push plate; 310. Threaded rod; 311. Spring; 312. Sealing baffle; 313. High-pressure baffle; 314. One-way valve; 315. Feed pipe; 316. Pressure relief port. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to embodiments:

[0033] Example 1: As Figure 1-8As shown, the present invention provides a UV-based total sulfur analyzer based on continuous sample injection, including an analyzer body 1. The analyzer body 1 is equipped with a continuous feeding unit 2 that allows filter replacement without shutting down the system. The output end of the continuous feeding unit 2 is equipped with a feeding switching unit 3 for stabilizing the output gas pressure. The continuous feeding unit 2 includes a feeding conduit 21 installed inside the analyzer body 1, a movable filter support 23 installed inside the feeding conduit 21 that allows filter replacement without leakage, and an auxiliary filter tube 22 installed at the output end of the feeding conduit 21 for filtering the gas during filter replacement.

[0034] There are two continuous feeding units 2, which are fixedly installed at the input ends of two pressure regulating valves 33 inside the feeding switching unit 3. The input end of the feeding conduit 21 is located on its top surface, and both ends of the movable filter element support 23 are provided with blocking blocks, and the length of the blocking blocks at both ends of the movable filter element support 23 is greater than the axial length of the input end and the output end of the feeding conduit 21;

[0035] The feed conduit 21 has a limiting groove 26 inside. The side of the movable filter element bracket 23 is fixedly connected to a limiting slider 25, which is slidably connected inside the limiting groove 26. The side of the movable filter element bracket 23 is fixedly connected to a limiting rod 29, which is engaged inside the side of the feed conduit 21. The inside of the movable filter element bracket 23 is fixedly connected to a limiting block 27. A detachable filter element 28 is engaged inside the movable filter element bracket 23. A permanent filter element bracket 24 is slidably connected inside the side of the auxiliary filter tube 22. A permanent filter element 211 is movably connected inside the permanent filter element bracket 24. An air supply pipe 210 is fixedly connected to the output end of the auxiliary filter tube 22.

[0036] The feed conduit 21 has cavities at both ends that can accommodate the end blocks of the movable filter element support 23. When one end of the movable filter element support 23 moves inside the feed conduit 21, its corresponding end block will temporarily block the gas flow channel inside the feed conduit 21. The limiting slide groove 26 and the limiting slider 25 cooperate with each other to restrict the movement path of the movable filter element support 23.

[0037] When the movable filter element support 23 moves to its limit position, the blockage on its side is stored in the cavity at the other end of the feed conduit 21. At this time, the gas channel inside the feed conduit 21 is reconnected, and the gas can continue to flow.

[0038] The movable filter element bracket 23 is provided with a limiting rod 29 on its side. The limiting rod 29 can be locked onto the side wall of the feed conduit 21. The feed conduit 21 is provided with an insert rod for limiting the limiting rod 29. The top surface of the movable filter element bracket 23 is provided with a detachable filter element 28 for filtering airflow. The limiting block 27 limits the detachable filter element 28 to ensure its stability during operation.

[0039] The auxiliary filter tube 22 has a permanent filter element support 24 in a permanent state inside its side. The permanent filter element 211 inside it has the same structure as the removable filter element 28 but is larger in size. The permanent filter element support 24 can only be opened for maintenance and cleaning when the equipment is stopped.

[0040] In this embodiment, the gas sample to be input enters through the input end of the feed conduit 21. After passing through the removable filter element 28 to filter the impurities inside, it is transmitted to the inside of the auxiliary filter tube 22. At this time, the resident filter element 211 set inside the auxiliary filter tube 22 performs auxiliary filtration and further purification of the gas. Then, the gas is transmitted to the subsequent feed switching unit 3 so that the gas can be input into the analyzer body 1 under appropriate gas pressure conditions to complete the analysis operation.

[0041] When the gas sample is continuously fed, the impurities inside it will be continuously trapped by the removable filter element 28, which will cause the permeability of the removable filter element 28 to gradually decrease. At this time, the operator can remove the plug that limits the limit rod 29 and pull the movable filter element bracket 23. Since the size of the block provided on the side of the movable filter element bracket 23 is larger than the size of the input end and output end of the feed pipe 21, it will temporarily block the gas flow path inside the feed pipe 21 during its movement.

[0042] When the movable filter element support 23 moves to its limit position, the feed conduit 21 is reconnected, and gas can continue to enter the auxiliary filter tube 22. At this time, the resident filter element 211 set in the auxiliary filter tube 22 undertakes the main filtration function for a short time. The operator can quickly remove the removable filter element 28 in the movable filter element support 23 for replacement and reset. After replacement, the removable filter element 28 in the movable filter element support 23 resumes its filtration function, thus ensuring the overall filtration effect of the equipment quickly without stopping the machine.

[0043] Example 2: As Figure 1-8As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the feeding switching unit 3 includes a pressure regulating valve 33 disposed at the output end of the continuous feeding unit 2 for adjusting the output gas pressure, a regulating valve 32 disposed at the output end of the pressure regulating valve 33 for adjusting the gas delivery pipeline, and a one-way valve core 38 disposed inside the regulating valve 32 for isolating. A fixed bracket 31 is fixedly connected to the outer surface of the regulating valve 32, an air inlet pipe 34 is fixedly connected to the output end of the regulating valve 32, and an adjusting gear 35 is rotatably connected to the inside of the side of the regulating valve 32.

[0044] There are two regulating valves 32, which are connected to two continuous feeding units 2 respectively. The opening states of the one-way valve cores 38 inside the two regulating valves 32 are always opposite. The regulating valves 32 are fixedly connected to the regulating gears 35, and both are rotatably connected inside the regulating valves 32.

[0045] A drive rack 36 is slidably connected inside the fixed bracket 31, and a hydraulic telescopic rod 37 is fixedly connected to the other end of the fixed bracket 31. The output end of the hydraulic telescopic rod 37 is fixedly connected to the middle of the drive rack 36. The adjusting gear 35 meshes with the drive rack 36. A one-way valve core 38 is rotatably connected inside the regulating valve 32. One end of the one-way valve core 38 passes through the side of the regulating valve 32 and is fixedly connected to the adjusting gear 35.

[0046] The fixed bracket 31 is equipped with a hydraulic telescopic rod 37, which is used to drive the drive rack 36 to slide. The fixed bracket 31 is also equipped with a slide rail for limiting the drive rack 36.

[0047] When the drive rack 36 moves, the adjusting gear 35 meshing with it drives the regulating valve 32 to rotate. When the hydraulic telescopic rod 37 pushes the drive rack 36 to its limit position, it can drive the regulating valve 32 to rotate 90 degrees. When the hydraulic telescopic rod 37 drives the drive rack 36 to retract to its limit position, it can make the regulating valve 32 complete a 90-degree reset.

[0048] In this embodiment, when a gas sample is introduced into any continuous feeding unit 2, the hydraulic telescopic rod 37 drives the drive rack 36 to move, thereby opening the one-way valve core 38 inside the corresponding regulating valve 32. The gas filtered and regulated through this path enters the analyzer body 1 through the air inlet pipe 34 at a suitable pressure to complete the detection operation.

[0049] At the same time, another regulating valve 32 remains closed, allowing the operator to replace the resident filter element 211 and the removable filter element 28 in the corresponding path, and to introduce high-pressure gas into the path to expel the residual gas sample inside, ensuring that the gas sample passing through the path later is pure.

[0050] Since the regulating valve 32 connected to the feed pipe 315 is in a closed state at this time, the gas pressure inside the pressure regulating valve 33 continues to rise, and the residual gas sample inside the path is discharged through the pressure relief port 316, thereby completing the cleaning process of the path without affecting the normal testing operation.

[0051] Example 3: As Figure 1-8 As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, a pressure regulating valve 33 is fixedly connected to the input end of a regulating valve 32, a one-way valve 314 is fixedly connected to one end of the inside of the pressure regulating valve 33, a threaded rod 310 is threadedly connected to the inside of the side of the pressure regulating valve 33, a push plate 39 is rotatably connected to one end of the outer surface of the threaded rod 310, the push plate 39 is slidably connected to the inside of the pressure regulating valve 33, a spring 311 is fixedly connected to the side of the push plate 39, a sealing baffle 312 is fixedly connected to the other end of the spring 311, a high-pressure baffle 313 is fixedly connected to the side of the sealing baffle 312, a pressure relief port 316 is opened on the top surface of the pressure regulating valve 33, and a feed pipe 315 is fixedly connected to the bottom surface of the pressure regulating valve 33;

[0052] The pressure regulating valve 33 is located at the output end of the gas supply pipe 210. The pressure regulating valve 33 is equipped with a one-way valve 314 with multiple one-way gas outlets. A buffer gasket is provided on the contact surface between the one-way valve 314 and the sealing baffle 312. The pressure regulating valve 33 is equipped with a slide for limiting the movement trajectory of the sealing baffle 312.

[0053] The feed pipe 315 and the pressure relief port 316 inside the pressure regulating valve 33 are located on the same axis, and the high pressure baffle 313 on the side of the sealing baffle 312 only serves to block the pressure relief port 316.

[0054] A threaded rod 310 is provided on the back of the pressure regulating valve 33. The threaded rod 310 is used to control the position of the push plate 39 inside the pressure regulating valve 33, thereby further adjusting the compression state of the spring 311 between the push plate 39 and the sealing baffle 312.

[0055] In this embodiment, before use, the operator can rotate the threaded rod 310 according to the required output air pressure to change the distance between the push plate 39 and the sealing baffle 312, thereby adjusting the compression of the spring 311 and changing the gas pressure required to push the sealing baffle 312, thereby indirectly adjusting the output air pressure of the pressure regulating valve 33.

[0056] The filtered gas is delivered to the pressure regulating valve 33 and temporarily lingers inside the pressure regulating valve 33 under the action of the one-way valve 314. When the gas pressure reaches the set range, the gas pressure pushes the sealing baffle 312 to slide along the slide. At this time, the input end of the feed pipe 315 is exposed, allowing the gas to enter the analyzer body 1 with a continuous and stable appropriate pressure to complete the detection operation.

[0057] When the input gas pressure exceeds the set range, the sealing baffle 312 moves further under the action of gas pressure, and the pressure relief port 316 is exposed. Some gas is discharged into the external container through the pressure relief port 316. The operator can adjust the input gas pressure to a suitable range in time to avoid excessive gas pressure fluctuations from affecting the accuracy of the detection.

[0058] The working principle of this UV-based total sulfur analyzer, which is based on continuous sample injection, will be explained in detail below.

[0059] like Figure 1-8 As shown, the gas sample first enters the system through the inlet end of the feed conduit 21. After entering, the gas undergoes preliminary filtration through the removable filter element 28 to remove internal impurities, and is then transported to the auxiliary filter tube 22. At this point, the resident filter element 211 inside the auxiliary filter tube 22 further filters and purifies the gas to ensure that the gas reaches a suitable cleanliness level, and then it is delivered to the subsequent feed switching unit 3, entering the analyzer body 1 to complete the analysis operation at an appropriate gas pressure.

[0060] As the gas sample is continuously fed, impurities will gradually be trapped by the removable filter element 28, which will cause the permeability of the removable filter element 28 to gradually decrease. When the filtration capacity of the removable filter element 28 decreases, the operator can remove the insert rod on the limit lever 29 and pull the movable filter element bracket 23. Since the size of the blockage on the side of the movable filter element bracket 23 is larger than the size of the input and output ends of the feed conduit 21, it will temporarily block the airflow path inside the feed conduit 21 during its movement.

[0061] When the movable filter element support 23 reaches its limit position, the airflow path of the feed conduit 21 is reconnected, allowing gas to continue flowing into the auxiliary filter tube 22. At this time, the resident filter element 211 in the auxiliary filter tube 22 will take over the main filtration task for a short period to ensure continuous gas cleanliness. Simultaneously, the operator can quickly remove the removable filter element 28 from the movable filter element support 23 for replacement and resetting. After replacement, the removable filter element 28 in the movable filter element support 23 resumes its filtration function, thus quickly maintaining the equipment's filtration effect without shutting down the machine.

[0062] During this process, when a gas sample from any continuous feeding unit 2 is introduced into the system, the hydraulic telescopic rod 37 drives the rack 36 to move, thereby opening the one-way valve core 38 inside the corresponding regulating valve 32. The gas, after being filtered and pressure-regulated through this path, will enter the analyzer body 1 at a suitable pressure through the air inlet pipe 34 to complete the detection operation.

[0063] Meanwhile, another regulating valve 32 remains closed, allowing the operator to replace the resident filter element 211 and the removable filter element 28 within this path, and to expel any residual gas samples inside using high-pressure gas, thus ensuring the purity of subsequent gas samples. During this process, as regulating valve 32 closes, the gas pressure inside pressure regulating valve 33 will continuously rise, and residual gas in the path will be expelled through pressure relief port 316, ensuring that the path is completely clean and does not affect normal testing operations.

[0064] Before use, the operator can adjust the threaded rod 310 according to the required output air pressure, thereby adjusting the distance between the push plate 39 and the sealing baffle 312, thus adjusting the compression degree of the spring 311 and changing the air pressure required to push the sealing baffle 312. This adjustment indirectly achieves the purpose of regulating the output air pressure of the pressure regulating valve 33.

[0065] The filtered gas is delivered to the pressure regulating valve 33 and temporarily retained inside the valve under the action of the one-way valve 314. When the gas pressure reaches the set range, the gas pressure pushes the sealing baffle 312 to slide, exposing the input end of the feed pipe 315, allowing the gas to enter the analyzer body 1 at a suitable and continuous pressure to complete the detection operation.

[0066] When the pressure of the input gas exceeds the set range, the gas pressure pushes the sealing baffle 312 to continue moving, exposing the pressure relief port 316. Some gas is then discharged into the external container through the pressure relief port 316. The operator can adjust the input gas pressure to a suitable range in a timely manner to avoid excessive pressure fluctuations that could affect the accuracy of the detection.

[0067] In summary, the essence of this device is to utilize multiple components, including the feed conduit 21, removable filter element 28, auxiliary filter tube 22, permanent filter element 211, pressure regulating valve 33, and adjusting valve 32, to form a complete process for gas input, filtration, pressure regulation, detection, and maintenance. Before entering the analyzer body 1, the gas sample undergoes two stages of filtration, ensuring the accuracy of the detection. Through regular filter element replacement and flexible pressure regulation and depressurization control, the system can maintain filtration effectiveness without shutting down and clean residual gas samples in the path, ensuring stable gas quality during the analysis process and avoiding the impact of pressure fluctuations on the detection.

[0068] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A UV-based total sulfur analyzer based on continuous sample injection, comprising an analyzer body (1), characterized in that: The analyzer body (1) is equipped with a continuous feeding unit (2) that can replace the filter element without stopping the machine. The output end of the continuous feeding unit (2) is equipped with a feeding switching unit (3) for stabilizing the output gas pressure. The continuous feeding unit (2) includes a feed conduit (21) inside the analyzer body (1), a movable filter element support (23) inside the feed conduit (21) that can replace the filter element without leakage, and an auxiliary filter tube (22) at the output end of the feed conduit (21) for filtering the gas during the filter element replacement process. The feeding switching unit (3) includes a pressure regulating valve (33) installed at the output end of the continuous feeding unit (2) for adjusting the output gas pressure, a regulating valve (32) installed at the output end of the pressure regulating valve (33) for adjusting the gas transmission pipeline, and a one-way valve core (38) installed inside the regulating valve (32) for isolating.

2. The UV-based total sulfur analyzer based on continuous sample injection according to claim 1, characterized in that: The feed conduit (21) has a limiting groove (26) inside, and the movable filter element bracket (23) is fixedly connected to a limiting slider (25) on its side. The limiting slider (25) is slidably connected inside the limiting groove (26).

3. The UV-based total sulfur analyzer based on continuous sample injection according to claim 2, characterized in that: The movable filter element bracket (23) is fixedly connected to a limiting rod (29) on its side. The limiting rod (29) is engaged inside the side of the feed conduit (21). The movable filter element bracket (23) is fixedly connected to a limiting block (27) inside. The movable filter element bracket (23) is engaged with a detachable filter element (28) inside.

4. The UV-based total sulfur analyzer based on continuous sample injection according to claim 3, characterized in that: The auxiliary filter tube (22) has a permanent filter element support (24) slidably connected to its side interior, and a permanent filter element (211) is movably connected inside the permanent filter element support (24). The output end of the auxiliary filter tube (22) is fixedly connected to an air supply pipe (210).

5. The ultraviolet total sulfur analyzer based on continuous sample injection according to claim 4, characterized in that: The outer surface of the regulating valve (32) is fixedly connected to a fixed bracket (31), the output end of the regulating valve (32) is fixedly connected to an air inlet pipe (34), and the side of the regulating valve (32) is rotatably connected to an adjusting gear (35).

6. The UV-based total sulfur analyzer based on continuous sample injection according to claim 5, characterized in that: The fixed bracket (31) has a drive rack (36) slidably connected inside, and a hydraulic telescopic rod (37) is fixedly connected to the other end of the fixed bracket (31). The output end of the hydraulic telescopic rod (37) is fixedly connected to the middle of the drive rack (36), and the adjusting gear (35) meshes with the drive rack (36).

7. The UV-based total sulfur analyzer based on continuous sample injection according to claim 6, characterized in that: The one-way valve core (38) is rotatably connected inside the regulating valve (32), and one end of the one-way valve core (38) passes through the side of the regulating valve (32) and is fixedly connected to the regulating gear (35).

8. The UV-based total sulfur analyzer based on continuous sample injection according to claim 7, characterized in that: The pressure regulating valve (33) is fixedly connected to the input end of the regulating valve (32). One-way valve (314) is fixedly connected to one end of the pressure regulating valve (33). Threaded rod (310) is threadedly connected to the inside of the side of the pressure regulating valve (33).

9. The ultraviolet total sulfur analyzer based on continuous sample injection according to claim 8, characterized in that: A push plate (39) is rotatably connected to one end of the outer surface of the threaded rod (310). The push plate (39) is slidably connected inside the pressure regulating valve (33). A spring (311) is fixedly connected to the side of the push plate (39).

10. The UV-based total sulfur analyzer based on continuous sample injection according to claim 9, characterized in that: The other end of the spring (311) is fixedly connected to a sealing baffle (312), the side of the sealing baffle (312) is fixedly connected to a high pressure baffle (313), the top surface of the pressure regulating valve (33) is provided with a pressure relief port (316), and the bottom surface of the pressure regulating valve (33) is fixedly connected to a feed pipe (315).

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