Miniaturized gaseous nitrous acid analyzer

Abstract

The utility model relates to gas monitoring technology, specifically provide miniaturized gaseous nitrous acid analyzer, including analysis unit, the analysis unit includes light source module, flow cell and detection module, the analysis unit still includes: first optical fiber and second optical fiber have ceramic plug core and optical fiber joint respectively, ceramic plug core connects one end of three -way joint respectively, and optical fiber joint connects light source module and detection module respectively, flow cell includes composite pipe and switching module, the composite pipe includes glass tube and protection tube, glass tube sets up in the inside of protection tube, switching module connects glass tube and protection tube, and fixes on the other end of three -way joint, first ceramic plug core, first three -way joint, first switching module, composite pipe, second switching module, second three -way joint and second ceramic plug core are in straight line and set gradually. The utility model has the advantages of miniaturization, convenient maintenance etc.

Description

Technical Field

[0001] This utility model relates to gas monitoring technology, and in particular to a miniaturized gaseous nitrous acid analyzer. Background Technology

[0002] The mainstream method for measuring gaseous nitrous acid (HONO) in ambient air is wet chemical sampling combined with long path differential absorption spectroscopy (LOPAP). This method completely samples HONO gas from the absorption solution, generating a rose-red azo dye. The azo dye has a maximum absorption peak at a wavelength of 550 nm. By measuring the change in absorbance of the solution in this wavelength range using a detection device, the concentration of HONO can be accurately quantified.

[0003] Currently, most HONO analyzers on the market use a combination of LED light source, liquid-core waveguide (LCW), and spectrometer for long-path photometric measurements. The drawback of this type of analyzer is that:

[0004] 1. The entire testing device is expensive, occupies a large space, cannot be miniaturized, and has a complex structure for each component, making installation, disassembly, and replacement inconvenient. In addition, it is a closed design, which makes it impossible to directly observe the liquid flow status when problems occur in the liquid circuit system, resulting in difficulties in troubleshooting and affecting operation and maintenance efficiency.

[0005] 2. Liquid core waveguides require the use of special (AF2400) fluorine tubing, which is expensive and has a complex manufacturing process. During use, the tubing wall is prone to adsorbing air bubbles or staining, which can lead to abnormal signals or reduced light transmission efficiency. Frequent cleaning cannot completely solve this problem, and the tube must be replaced after long-term use. Utility Model Content

[0006] To address the shortcomings of the existing technical solutions, this utility model provides a miniaturized gaseous nitrous acid analyzer.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] A miniaturized gaseous nitrous acid analyzer includes an analysis unit, which comprises a light source module, a flow cell, and a detection module; the analysis unit further includes:

[0009] The first optical fiber and the second optical fiber each have a ceramic ferrule and an optical fiber connector. The ceramic ferrule is connected to one end of a tee connector, and the optical fiber connector is connected to the light source module and the detection module.

[0010] The flow pool includes a composite tube and an adapter module. The composite tube includes a glass tube and a protective tube. The glass tube is disposed inside the protective tube. The adapter module connects the glass tube and the protective tube and is fixed to the other end of the tee connector. The first ceramic insert, the first tee connector, the first adapter module, the composite tube, the second adapter module, the second tee connector, and the second ceramic insert are arranged in a straight line in sequence.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. The components used in this application are inexpensive, the fixing and assembly of each component are simple and stable, and the overall size of the device can be miniaturized to meet various experimental or monitoring needs.

[0013] Each module is easy to assemble and manufacture. They are placed side by side and fixed in the corresponding grooves on the base. They can be disassembled or replaced individually with a few operations.

[0014] 2. PTFE material connectors are used in key flow path parts. The transparency of the T-connector material allows direct observation of the fluid flow status at the input or output interface, enabling efficient location and resolution of various problems in the fluid path system.

[0015] 3. The length of the (quartz) glass tube and the (stainless steel) protective tube can be customized according to the actual usage conditions and measurement requirements. The glass material is resistant to pollution and easy to clean. After long-term use, only simple cleaning is required, which effectively reduces the frequency and difficulty of maintenance. Attached Figure Description

[0016] The disclosure of this utility model will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the analysis unit according to this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the analysis unit according to this utility model.

[0019] In the attached diagram, 1-detector, 2-shielding cover, 3-front panel, 4-second fiber optic connector, 5-second ceramic ferrule, 6-second tee connector, 7-liquid outlet, 8-second support base, 9-second connector, 10-second adapter, 11-protective tube, 12-glass tube, 13-first connector, 14-first adapter, 15-liquid inlet, 16-first support base, 17-first tee connector, 18-first ceramic ferrule, 19-first fiber optic connector, 20-protective cover, 21-base, 22-housing, 23-lens, 24-first gasket, 25-filter, 26-second gasket, 27-light source, 28-heater, 29-temperature sensor, 30-rear cover, 41-flow cell, 51-light source module, 52-detection module, 61-first fiber optic, 62-second fiber optic. Detailed Implementation

[0020] Figures 1-2 The following description illustrates optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce it. For the purpose of teaching the technical solutions of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Therefore, the present invention is not limited to the following optional embodiments, but is defined only by the claims and their equivalents.

[0021] Example 1

[0022] This embodiment of an outdoor working gaseous nitrous acid analyzer includes an analysis unit.

[0023] like Figure 1 As shown, the analysis unit includes a light source module 51, a flow cell 41, and a detection module 52.

[0024] The first optical fiber 61 has a first ceramic ferrule 18 and a first optical fiber connector 19, and the second optical fiber 62 has a second ceramic ferrule 5 and a second optical fiber connector 4.

[0025] The first ceramic ferrule 18 is connected to the first tee connector 17, and the first fiber optic connector 19 is connected to the light source module 51. The second ceramic ferrule 5 is connected to the second tee connector 6, and the second fiber optic connector 4 is connected to the detection module 52.

[0026] The flow pool 41 includes a composite tube, a first adapter module, and a second adapter module. The composite tube includes a glass tube 12 and a protective tube 11. The glass tube 12 is disposed inside the protective tube 11. The adapter module connects the glass tube 12 and the protective tube 11 and is fixed to the other end of the tee connector. The first ceramic insert 18, the first tee connector 17, the first adapter module, the composite tube, the second adapter module, the second tee connector 6, and the second ceramic insert 5 are arranged in a straight line in sequence.

[0027] like Figure 1 As shown, the analysis unit further includes:

[0028] The light source module 51, the first tee connector 17, the second tee connector 6, and the detection module 52 are respectively fixed on the base 21.

[0029] The protective cover 20 is fixed on the base 21 and forms a space to accommodate the light source module 51, the flow cell 41 and the detection module 52.

[0030] The pipe passes through the protective cover 20 and connects the liquid inlet 18 of the first tee connector 17 and the liquid outlet 7 of the second tee connector 6.

[0031] The upper wall of the protective cover 20 has an opening, a rubber component is disposed at the opening, and the pipe passes through the rubber component.

[0032] The detection module 52 includes:

[0033] Detector 1 is fixed on the circuit board.

[0034] The front panel 3 is fixed on the shielding cover 2, the circuit board is fixed inside the shielding cover 2, and the second fiber optic connector 4 is fixed on the front panel 3.

[0035] like Figure 2 As shown, the light source module 51 includes:

[0036] The inner wall of the shell 22 has multiple square plates, and hollow areas are formed between the multiple square plates.

[0037] Lens 23, first washer 24, filter 25, second washer 26 and light source 27 are sequentially fitted into the hollow area, and light source 27 is fixed on the back cover 30.

[0038] Heater 28 and temperature sensor 29 are inserted into back cover 30 respectively.

[0039] The first ceramic ferrule 18 and the second ceramic ferrule 5 respectively include a bare core, a ceramic sleeve and an outer sleeve arranged sequentially from the inside to the outside;

[0040] The plug is inserted into one end of the first tee connector 17 (the second tee connector 6), the first pressure ring is squeezed between the plug and the first tee connector 17 (the second tee connector 6), the ceramic sleeve passes through the plug, and the bare core is inserted into one end of the first tee connector 17 (the second tee connector 6).

[0041] To achieve the switching function, the first switching module further includes:

[0042] The first adapter 14 includes a larger inner diameter portion and a smaller inner diameter portion. The glass tube 12 passes through the larger inner diameter portion and the smaller inner diameter portion. The protective tube 11 is inserted into the larger inner diameter portion and blocked. The smaller inner diameter portion is inserted into the other end of the first tee connector 17. The second pressure ring is squeezed between the end of the first tee connector 17 and the smaller inner diameter portion.

[0043] The first connector 13 and the third pressure ring are sleeved on the outside of the protective tube 11. The first connector 13 is inserted into the inside of the larger inner diameter portion, and the third pressure ring is squeezed between the larger inner diameter portion and the end of the first connector 13.

[0044] The second adapter module adopts the same structure as the first adapter module, namely, it includes a second connector 9 and a second adapter 10.

[0045] Example 2

[0046] Application example of the miniaturized gaseous nitrous acid analyzer according to Embodiment 1 of this utility model.

[0047] like Figure 1 As shown, the light source module 51, the first optical fiber 61, the first tee connector 17, the flow cell 41, the second tee connector 6, the second optical fiber 62, and the detection module 52 are arranged in a straight line and fixed to the base 21, inside the protective cover 20. The first optical fiber 61 and the second optical fiber 62 are 110mm long and have a core diameter of 0.6mm.

[0048] like Figure 2 As shown, within the light source module 51, the housing 22 is fixed to the base 21. The interior has four axially extending square plates that enclose a hollow, square-prism-shaped region. A (spherical) lens 23, a first (annular metal) washer 24, a (bandpass) filter 25, and a second (annular rubber) washer 26 are sequentially arranged within this hollow region. The light source 27 is a halogen tungsten lamp, fixed to the rear cover 30. A heater 28 and a temperature sensor 29 are inserted into the rear cover 30.

[0049] In the first optical fiber 61, the first optical fiber connector 19 is fixed to the housing 22. Light emitted from the light source 27 passes through the filter 25 and the lens 23 and is coupled into the first optical fiber 61. The first ceramic ferrule 18 includes a bare core, a ceramic sleeve, and an outer sleeve arranged sequentially from the inside out. The plug mates with the internal thread of one end of the first tee connector 17 through its external thread. A first pressure ring is pressed between the end of the plug and the first tee connector 17. The ceramic sleeve passes through the plug, and the bare core is inserted into the first tee connector 17.

[0050] The second optical fiber 62, the second ceramic ferrule 5, and the second tee connector 6 are connected in the same way.

[0051] The first tee connector 17 (made of transparent PTFE material) is fixed to the base 21 by the first support 16. The upper opening is a liquid inlet 15, and a pipe is connected to the liquid inlet 15 and passes through the rubber part at the opening of the upper wall of the protective cover 20. Similarly, the second tee connector 6 (made of transparent PTFE material) is fixed to the base 21 by the second support 8. The upper opening is a liquid outlet 7, and a pipe is connected to the liquid outlet 7 and passes through the rubber part at the opening of the upper wall of the protective cover 20.

[0052] In the flow cell 41, the glass tube 12 is made of quartz, with a length of 200 mm, an inner diameter of 1.0 mm, and an outer diameter of 1.6 mm. The protective tube 11 is made of stainless steel, with a length of 160 mm, an inner diameter of 1.8 mm, and an outer diameter of 3.1 mm.

[0053] In the first adapter module, the first adapter 14 includes a larger inner diameter portion and a smaller inner diameter portion. The glass tube 12 passes through the larger inner diameter portion and the smaller inner diameter portion. The protective tube 11 is inserted into the larger inner diameter portion and blocked. The smaller inner diameter portion matches the internal thread of the other end of the first tee connector 17 with its external thread. The second pressure ring is pressed between the end of the first tee connector 17 and the smaller inner diameter portion.

[0054] The first connector 13 and the third pressure ring are sleeved on the outside of the protective tube 11. The first connector 13 uses its external thread to match the internal thread of the larger inner diameter portion. The third pressure ring is squeezed between the larger inner diameter portion and the end of the first connector 13.

[0055] The second adapter module adopts the same structure as the first adapter module, so that the other end of the composite pipe is connected to the second tee connector 6.

[0056] In the detection module 52, the PD detector 1 is fixed on the circuit board. The front plate 3 is fixed on the shielding cover 2, the circuit board is fixed inside the shielding cover 2, and the second fiber optic connector 4 is fixed on the front plate 3.

[0057] During operation, the liquid enters the flow pool 41 through the liquid inlet 15 via a pipe, and then exits through the liquid outlet 7 and the pipe.

[0058] Simultaneously, the light emitted by the light source 27 passes through the filter 25 and lens 23, enters the first optical fiber 61, and then enters the flow cell 41. After passing through the liquid, it enters the second optical fiber 62 and is finally received by the detector 1.

Claims

1. A miniaturized gaseous nitrous acid analyzer, comprising an analysis unit, said analysis unit including a light source module, a flow cell, and a detection module; characterized in that, The analysis unit further includes: The first optical fiber and the second optical fiber each have a ceramic ferrule and an optical fiber connector. The ceramic ferrule is connected to one end of a tee connector, and the optical fiber connector is connected to the light source module and the detection module. The flow pool includes a composite tube and an adapter module. The composite tube includes a glass tube and a protective tube. The glass tube is disposed inside the protective tube. The adapter module connects the glass tube and the protective tube and is fixed to the other end of the tee connector. The first ceramic insert, the first tee connector, the first adapter module, the composite tube, the second adapter module, the second tee connector, and the second ceramic insert are arranged in a straight line in sequence.

2. The gaseous nitrous acid analyzer according to claim 1, characterized in that, The analysis unit further includes: The base, on which the light source module, the three-way connector and the detection module are respectively fixed; A protective cover is fixed to the base and forms a space to accommodate the light source module, the flow cell, and the detection module; The pipe passes through the protective cover and connects to the liquid inlet and liquid outlet of the tee fitting.

3. The gaseous nitrous acid analyzer according to claim 2, characterized in that, The upper wall of the protective cover has an opening, a rubber component is disposed at the opening, and the pipe passes through the rubber component.

4. The gaseous nitrous acid analyzer according to claim 1, characterized in that, The detection module includes: A detector and a circuit board, wherein the detector is fixed to the circuit board; The shielding cover and the front panel are fixed to the shielding cover, the circuit board is fixed inside the shielding cover, and the fiber optic connector is fixed to the front panel.

5. The gaseous nitrous acid analyzer according to claim 1, characterized in that, The light source module includes: The housing and the back cover, wherein the inner wall of the housing has multiple square plates, and hollow areas are formed between the multiple square plates; The lens, the first washer, the filter, the second washer, and the light source are sequentially fitted into the hollow area, and the light source is fixed to the back cover; A heater and a temperature sensor are respectively inserted into the back cover.

6. The gaseous nitrous acid analyzer according to claim 5, characterized in that, The light source is a halogen tungsten lamp.

7. The gaseous nitrous acid analyzer according to claim 1, characterized in that, The ceramic insert includes a bare core, a ceramic sleeve, and an outer sleeve arranged sequentially from the inside out; A plug and a first pressure ring are provided, the plug being inserted into one end of a tee connector, the first pressure ring being squeezed between the plug and the tee connector, the ceramic sleeve passing through the plug, and the bare core being inserted into one end of the tee connector.

8. The gaseous nitrous acid analyzer according to claim 7, characterized in that, The external thread of the plug matches the internal thread of the tee connector.

9. The gaseous nitrous acid analyzer according to claim 1, characterized in that, The adapter module includes: The adapter includes a larger inner diameter portion and a smaller inner diameter portion, through which the glass tube passes, and the protective tube is inserted into and blocked by the larger inner diameter portion; the smaller inner diameter portion is inserted into the other end of the tee connector, and a second pressure ring is squeezed between the ends of the tee connector and the smaller inner diameter portion. A connector and a pressure ring are fitted on the outside of the protective tube. The connector is inserted into the inside of the larger inner diameter portion, and the third pressure ring is squeezed between the larger inner diameter portion and the end of the connector.

10. The gaseous nitrous acid analyzer according to claim 9, characterized in that, The internal thread of the larger inner diameter portion matches the external thread of the connector, and the external thread of the smaller inner diameter portion matches the internal thread of the tee fitting.

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