Protective gas nozzle and sensor for high-concentration gas detection

Abstract

The utility model discloses a protective gas nozzle for high-concentration gas detection, which is characterized by comprising a gas nozzle conduit, a gas inlet pipe is inserted in the gas nozzle conduit, a gap is arranged between the gas nozzle conduit and the gas inlet pipe and forms a protective gas cavity, the upper end of the gas nozzle conduit is sleeved with a protective cavity body in a sealing manner, and the protective cavity body is provided with a gas outlet. The protective cavity is provided with a clean gas inlet nozzle, the clean gas inlet nozzle is in through connection with the protective gas cavity, one end of the gas inlet pipe penetrates through the protective cavity to be connected with the protective cap, the top of the protective cap is provided with a detection gas inlet nozzle, the detection gas inlet nozzle is in through connection with the gas inlet pipe, and the protective cavity is in sealed connection with the protective cap. According to the utility model, the sensor cavity can be effectively protected from being polluted or adhered by high-concentration particulate matters or aerosol, and the use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring technology, specifically to a protective gas nozzle and sensor for detecting high-concentration gases. Background Technology

[0002] Sensors are the core components in atmospheric particulate matter and aerosol monitoring, but they are also the most easily contaminated. When the inhaled concentration is high during particulate matter or aerosol monitoring, the inside of the sensor cavity is easily contaminated, and particulate matter may even adhere to the inner wall of the cavity, which will lead to inaccurate test results.

[0003] Furthermore, the sensor cannot self-clean, which not only delays the project schedule for customers, but also incurs high return-to-factory maintenance costs (as a core component, the sensor's maintenance costs are higher than other components). Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a protective gas nozzle and sensor for high-concentration gas detection, which can effectively protect the sensor cavity from contamination or adhesion by high-concentration particulate matter or aerosol, thereby reducing the cost of use.

[0005] To solve the above-mentioned technical problems, this utility model provides a protective nozzle for high-concentration gas detection, including a nozzle guide tube, an inlet pipe inserted inside the nozzle guide tube, a gap between the nozzle guide tube and the inlet pipe forming a protective gas cavity, a protective cavity being sealed at the upper end of the nozzle guide tube, a clean gas inlet nozzle being disposed on the protective cavity, the clean gas inlet nozzle being connected to the protective gas cavity, one end of the inlet pipe passing through the protective cavity and connected to a protective cap, a detection gas inlet nozzle being disposed on the top of the protective cap, the detection gas inlet nozzle being connected to the inlet pipe, and the protective cavity being sealed to the protective cap.

[0006] Furthermore, an mounting plate is provided on the outer surface of the air nozzle guide tube, and the mounting plate is used to limit the installation position of the protective cavity.

[0007] Furthermore, a first sealing ring is provided on the inner wall of the protective cavity, and the protective cavity is inserted into the air nozzle guide tube and sealed and fixed by the first sealing ring.

[0008] Furthermore, the protective cavity and the protective cap are connected by threads and sealed by a second sealing ring.

[0009] Furthermore, the other end of the air intake pipe is located inside the lower end of the air nozzle guide.

[0010] Furthermore, the air intake pipe is connected to the protective cap by a thread, and the air intake pipe is made of stainless steel.

[0011] A sensor employing any of the protective air nozzles described above.

[0012] Furthermore, the sensor body includes a vertically intersecting gas channel and a laser detection channel. A detection cavity is provided at the intersection of the gas channel and the laser detection channel. One end of the gas channel is connected to a protective gas nozzle, and the other end is connected to a pumping power component. A laser generator and a photodetector are respectively provided at both ends of the laser detection channel.

[0013] Furthermore, a horizontal drainage section is provided at the end of the gas channel connected to the pumping power component.

[0014] The beneficial effects of this utility model are:

[0015] By introducing clean gas, high-concentration particulate matter or aerosols are diluted upon entering the detection chamber, and a protective barrier is formed around them. This prevents high-concentration particulate matter or aerosols from contacting the inner wall of the detection chamber, thus greatly reducing the possibility of contamination and solving the problem of particulate matter residue accumulation. This significantly improves detection accuracy and reduces the frequency of maintenance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the protective air nozzle structure of this utility model;

[0017] Figure 2 This is a utility model Figure 1 A schematic diagram of the cross-sectional structure;

[0018] Figure 3 This is a schematic diagram of the gas distribution when air is discharged from the nozzle end of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the sensor of this utility model;

[0020] Figure 5 This is a utility model Figure 4 A schematic diagram of the cross-sectional structure;

[0021] Figure 6 This is a utility model Figure 4 A schematic diagram of the structure exploded. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0023] Reference Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, an embodiment of the protective nozzle for high-concentration gas detection of this utility model includes a nozzle guide tube 1, an inlet pipe 2 inserted inside the nozzle guide tube, a gap between the nozzle guide tube and the inlet pipe forming a protective gas cavity 111, a protective cavity 3 sealed at the upper end of the nozzle guide tube, a clean gas inlet nozzle 4 disposed on the protective cavity, the clean gas inlet nozzle being connected to the protective gas cavity, one end of the inlet pipe passing through the protective cavity and connected to a protective cap 5, a detection gas inlet nozzle 6 disposed on the top of the protective cap, the detection gas inlet nozzle being connected to the inlet pipe, and the protective cavity and the protective cap being sealed together.

[0024] The protective gas nozzle delivers both clean gas and the detection gas to be tested into the detection chamber of the sensor body, serving a dilution and isolation protection function. Specifically, a suction power component operates to draw gas. The protective gas nozzle draws clean gas into the protective chamber through the clean gas inlet and the detection gas inlet through the detection gas inlet. Since one end of the inlet pipe is directly sealed to the protective cap, clean gas cannot enter the inlet pipe. Under the suction force, the clean gas flows along the protective gas chamber formed by the nozzle guide and the inlet pipe, and finally exits from the outlet end of the nozzle guide. The detection gas, however, can only flow along the inlet pipe and finally exits from the outlet end of the nozzle guide. The flow directions of the two gases during exit are as follows: Figure 3 As shown.

[0025] In both types of gases mentioned above, because the inlet pipe is located in the middle and the protective gas chamber surrounds the outer circumference of the inlet pipe, the discharged gas will also form a detection gas located in the middle of the clean gas. Although this method dilutes the detection gas, the clean gas does not contain particulate matter or other substances that could affect the detection, so the detection accuracy is not affected. The external clean gas also provides a certain degree of isolation, preventing the detection gas from diffusing too quickly and causing contamination.

[0026] For ease of installation, a mounting plate 7 is provided on the outer surface of the air nozzle guide tube. The mounting plate is used to lock and connect with the corresponding part of the corresponding sensor component, ensuring that the two do not separate. The mounting plate also restricts the installation position of the protective cavity, ensuring accurate installation. Specifically, a first sealing ring 8 is provided on the inner wall of the protective cavity. The protective cavity is inserted into the air nozzle guide tube and sealed and fixed by the first sealing ring. Multiple first sealing rings can be used. Through their own deformation, the force between the protective cavity and the air nozzle guide tube is greatly increased, preventing the protective cavity from being easily pulled out or detached during use. This assembly method improves disassembly efficiency when replacing parts. Of course, screws can also be used for locking and fixing at this position. The protective cavity and the protective cap are connected by threads and sealed by a second sealing ring 9, ensuring a sealing effect and fixing the position of the protective cavity and the protective cap. Furthermore, the position of the air inlet pipe is also fixed, ensuring the dimensional stability of the protective air cavity.

[0027] The other end of the air inlet pipe is located inside the lower end of the air nozzle guide tube, so that the detection gas will come into contact with and mix with the clean gas before entering the detection chamber. The air inlet pipe and the protective cap are connected by threads. The air inlet pipe is made of stainless steel, which is low in cost and has a good centering effect. It also reduces the contamination of the air inlet pipe by the detection gas and improves its service life.

[0028] This application also provides a sensor, referring to... Figure 3-6 As shown, the aforementioned protective gas nozzle 10 is used. Specifically, it includes a sensor body 112, within which a vertically intersecting gas channel 11 and a laser detection channel 12 are provided. A detection cavity 13 is provided at the intersection of the gas channel and the laser detection channel. One end of the gas channel is connected to the protective gas nozzle, and the other end is connected to the pumping power component. A laser generator and a photodetector are respectively provided at both ends of the laser detection channel.

[0029] The laser emitter emits a detection beam towards the detection cavity, simultaneously illuminating the photodetector. As the pumping power component operates, a negative pressure is created within the gas channel. The protective gas nozzle draws clean gas and detection gas into the gas channel through the clean gas inlet and the detection gas inlet. Specifically, the two gases are mixed within the detection cavity, significantly reducing the concentration of particulate matter or aerosols per unit volume. Due to the laser emitter's action, the mixed gas (the diluted detection gas) is detected by the photodetector, which counts the particulate matter or aerosols. Finally, the gas exits from the detection cavity at a lower concentration through the lower gas channel and is discharged. Because the concentration is diluted, this not only improves the accuracy of the sensor's detection but also protects the detection cavity from contamination.

[0030] Of course, the flow rate of the detected gas will decrease after the gas enters. At this time, the flow rate can be increased by increasing the power of the pumping unit to ensure that the flow rate of the detected gas meets the requirements. The gas channel connected to the pumping unit is provided with a horizontal guide section 14. The horizontal guide section bends the outlet of the mixed gas to ensure that the bottom of the sensor body can be attached to the equipment for installation, providing more installation options and avoiding interference.

[0031] The structure of this application can effectively prevent sensor contamination without affecting test results, greatly reducing sensor maintenance costs and improving customer monitoring efficiency.

[0032] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A protective gas nozzle for detecting high-concentration gases, characterized in that, The device includes an air nozzle guide tube, an air inlet pipe inserted inside the air nozzle guide tube, a gap between the air nozzle guide tube and the air inlet pipe forming a protective air chamber, a protective cavity sealed at the upper end of the air nozzle guide tube, a clean air inlet nozzle on the protective cavity, the clean air inlet nozzle being connected to the protective air chamber, one end of the air inlet pipe passing through the protective cavity and connected to a protective cap, a detection air inlet nozzle on the top of the protective cap, the detection air inlet nozzle being connected to the air inlet pipe, and the protective cavity and the protective cap being sealed together.

2. The protective gas nozzle for high-concentration gas detection as described in claim 1, characterized in that, An installation plate is provided on the outer surface of the air nozzle guide tube, and the installation plate is used to limit the installation position of the protective cavity.

3. The protective gas nozzle for high-concentration gas detection as described in claim 1, characterized in that, A first sealing ring is provided on the inner wall of the protective cavity, and the protective cavity is inserted into the air nozzle guide tube and sealed and fixed by the first sealing ring.

4. The protective gas nozzle for high-concentration gas detection as described in claim 1, characterized in that, The protective cavity and the protective cap are connected by threads and sealed by a second sealing ring.

5. The protective gas nozzle for high-concentration gas detection as described in claim 1, characterized in that, The other end of the air intake pipe is located inside the lower end of the air nozzle guide tube.

6. The protective gas nozzle for high-concentration gas detection as described in claim 1, characterized in that, The air intake pipe and the protective cap are connected by threads, and the air intake pipe is made of stainless steel.

7. A sensor, characterized in that, The protective air nozzle described in any one of claims 1-6 is used.

8. The sensor as described in claim 7, characterized in that, The sensor includes a sensor body, which contains a vertically intersecting gas channel and a laser detection channel. A detection cavity is provided at the intersection of the gas channel and the laser detection channel. One end of the gas channel is connected to a protective gas nozzle, and the other end is connected to a pumping power component. A laser generator and a photodetector are respectively provided at both ends of the laser detection channel.

9. The sensor as described in claim 8, characterized in that, A horizontal drainage section is provided at the end of the gas channel that is connected to the pumping power component.

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