Indoor harmful gas concentration measuring device

Abstract

The utility model relates to the technical field of gas concentration measurement, and discloses an indoor harmful gas concentration measurement device, which comprises a detection assembly, a gas concentration measurement assembly, a gas concentration measurement assembly, a gas concentration measurement assembly, a gas concentration measurement assembly, a gas concentration measurement assembly and a gas concentration measurement assembly, a sampling pipeline module is arranged on one side of the detection air chamber, an exhaust module is arranged on the other side of the detection air chamber, an air supply positive pressure module is arranged at the bottom of the detection air chamber, and a filtering module is arranged at the bottom of the air supply positive pressure module; the sampling pipeline module comprises a sampling pipe, a supporting pipe is arranged in the sampling pipe, one end of the sampling pipe is connected with the detection air chamber, the other end of the sampling pipe is provided with a plugging ring connected with the corresponding end of the supporting pipe, the supporting pipe is of a frame structure with a hollow pipe wall, and a filter membrane pipe is fixedly sleeved on the inner side of the supporting pipe; compared with the prior art, the device has the advantages that a layer of gas film is formed on the inner wall of the pipeline through positive pressure ventilation, harmful gas is isolated, corrosion and reaction are prevented, and the precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of gas concentration measurement technology, specifically to an indoor harmful gas concentration measurement device. Background Technology

[0002] In industrial settings, the air quality of indoor environments (such as workshops, control rooms, laboratories, and storage spaces) not only directly affects the stability of production processes and product quality, but is also closely related to the occupational health and safety of workers. Indoor hazardous gas concentration measuring devices, as "professional sentinels" for real-time monitoring and early warning of industrial indoor pollution, have become indispensable safety assurance equipment in industries such as petrochemicals, electronics manufacturing, metallurgy, pharmaceuticals, and warehousing, thanks to their high precision, high stability, and multi-parameter integration.

[0003] Pipeline gas detectors are a type of indoor hazardous gas concentration measurement device. However, in industry, some hazardous gases are highly corrosive or easily react with pipe materials. When measuring the concentration of these hazardous gases, they will preferentially react with the pipe wall, changing their composition and concentration. This not only affects the accuracy of the indoor air detector's gas concentration measurement, but also causes serious corrosion and damage to the pipes and detection instruments due to prolonged contact with pipes, reducing the equipment's service life and safety. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide an indoor harmful gas concentration measuring device. Its inner pipe wall is made of breathable material, and a layer of air film can be formed on the inner wall of the pipe through positive pressure ventilation to isolate harmful gases. After being drawn to the monitoring point by the exhaust module, the gases are mixed, diluted and measured, thereby protecting the pipe and the detection instrument.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] An indoor harmful gas concentration measuring device, comprising:

[0007] The detection component includes an instrument section, with a diffusion module and a pump suction module at the bottom of the instrument section, and a detection air chamber at the detection end of the pump suction module;

[0008] The detection chamber is equipped with a sampling pipeline module on one side, an exhaust module on the other side, and a positive pressure air supply module at the bottom, with a filter module at the bottom of the positive pressure air supply module.

[0009] The sampling pipeline module includes a sampling tube, a support tube is installed inside the sampling tube, one end of which is connected to the detection air chamber, and the other end is provided with a sealing ring connected to the corresponding end of the support tube. The support tube is a frame structure with hollowed-out pipe walls, and a filter membrane tube is sleeved and fixed inside. After a positive pressure is formed between the support tube and the filter membrane tube through the gas supply positive pressure module, the gas passes through the filter membrane tube wall and forms an air film on the inner wall of the filter membrane tube.

[0010] As an improvement, the detection chamber includes a detection box, which is connected to one end of the sampling tube and has a support frame inside. The support frame is a square box-shaped frame structure, and a filter membrane box that fits the detection box is installed inside. One side of the filter membrane box is connected to one end of the filter membrane tube.

[0011] As an improvement, the pump-suction module includes a pump suction chamber, the bottom of which is open and equipped with a pump suction filter membrane. The bottom of the pump suction chamber passes through the top wall of the detection box and is connected to the filter membrane box. A self-priming pump is installed in the pump suction chamber. An exhaust nozzle is installed on one side of the self-priming pump through the pump suction chamber, and a pump suction sensor is installed between the self-priming pump and the pump suction filter membrane.

[0012] As an improvement, the positive pressure air supply module includes a static pressure box, with multiple static pressure baffles arranged along the inner edge of the static pressure box, an air intake fan at the bottom, and multiple air supply pipes connected to the detection box at the top.

[0013] As an improvement, the filter module includes a filter box located at the bottom of the static pressure air box. The bottom of the filter box is open and has an air inlet window. A dust removal filter element is horizontally arranged inside the filter box.

[0014] As an improvement, the exhaust module includes an exhaust box, an activated carbon filter plate is installed inside the exhaust box, and a pipe is provided on one side that passes through the detection box and connects to the filter membrane box, and an exhaust fan is provided on the other side.

[0015] The advantages of this utility model compared with the prior art are as follows:

[0016] 1. This utility model is equipped with a positive pressure air supply module, which generates positive pressure by supplying air, thereby creating an airflow from the outside to the inside on the air-permeable filter membrane tube and filter membrane box. This forms a repulsive air film on the inner wall, preventing harmful gases entering the pipe from contacting the pipe wall, thus avoiding reaction or corrosion between the two. Furthermore, the gas forming the air film mixes and dilutes the harmful gases entering the pipe, reducing their corrosiveness and reactivity, further protecting the pipe wall and detection instruments, making it safer to use and extending the service life of the equipment.

[0017] 2. This utility model is equipped with a positive pressure gas supply module, and a static pressure air box is installed inside the positive pressure gas supply module. The speed and dynamic pressure of the gas supplied can be reduced by blocking, expanding and other methods, thereby ensuring that the gas supplied passes through the filter membrane tube and filter membrane box under the power of static pressure to form an air film. The gas supply effect is more uniform, and the service life of the filter membrane tube and filter membrane box is longer.

[0018] 3. This utility model isolates the detection gas by forming a gas film, avoiding the detection gas from reacting with the tube wall and other components, which could uncontrollably change its concentration and cause uncontrollable errors in the detection results, affecting the accuracy and reliability of the detection results. It is more convenient to use and has higher precision. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram showing the unfolded structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the detection component of this utility model.

[0022] Figure 4 This is a cross-sectional schematic diagram of the detection component of this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the detection chamber of this utility model.

[0024] Figure 6 This is a cross-sectional schematic diagram of the detection chamber of this utility model.

[0025] Figure 7 This is a cross-sectional schematic diagram of the sampling pipeline module of this utility model.

[0026] As shown in the figure: 1. Detection component; 11. Instrument section; 111. Rear cover; 112. Front cover; 113. Control chip; 114. Display screen; 115. Mounting box; 12. Diffusion module; 121. Diffusion chamber; 122. Diffusion sensor; 123. Diffusion filter membrane; 13. Pump suction module; 131. Pump suction chamber; 132. Self-priming pump; 133. Pump suction sensor; 134. Pump suction filter membrane; 135. Exhaust nozzle; 14. Wiring port; 15. Audible and visual alarm; 2. Detection chamber; 21. Detection box; 2 2. Support frame; 23. Filter membrane box; 24. Return interface; 25. Return pipe; 26. Positioning installation pipe; 3. Sampling pipeline module; 31. Sampling pipe; 32. Support pipe; 33. Filter membrane tube; 34. Sealing ring; 4. Positive pressure air supply module; 41. Static pressure air box; 42. Mounting hole; 43. Static pressure baffle; 44. Inlet fan; 45. Air supply pipe; 5. Exhaust module; 51. Exhaust box; 52. Exhaust fan; 53. Activated carbon filter plate; 6. Filter module; 61. Filter box; 62. Air inlet window; 63. Dust removal filter element. Detailed Implementation

[0027] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] As attached Figure 1 Appendix Figure 2 As shown, an indoor harmful gas concentration measuring device includes a detection component 1, a detection air chamber 2 at the bottom, a sampling pipe module 3 on one side of the detection air chamber 2, an exhaust module 5 on the other side, and a gas supply positive pressure module 4 at the bottom, with a filter module 6 at the bottom of the gas supply positive pressure module 4.

[0030] As attached Figure 2 Appendix Figure 7As shown, the sampling pipeline module 3 includes a sampling tube 31, a support tube 32 is provided inside the sampling tube 31, one end of which is connected to the detection air chamber 2, and the other end is provided with a sealing ring 34 connected to the corresponding end of the support tube 32. The support tube 32 is a frame structure with hollowed-out pipe walls, and a filter membrane tube 33 is sleeved and fixed inside.

[0031] In the above description, the detection component 1 detects the gas inside and around the detection chamber 2. When the positive pressure supply module 4 is activated, the gas surrounding the detection component 1, after being dusted by the filter module 6, is supplied through the positive pressure supply module 4 between the support pipe 32 and the filter membrane tube 33. This increases the air pressure between the support pipe 32 and the filter membrane tube 33, creating a positive pressure. Because the filter membrane tube 33 is permeable, the gas between the support pipe 32 and the filter membrane tube 33, under the pressure difference, penetrates the wall of the filter membrane tube 33 and enters the filter membrane tube 33. This forms a repulsive flow film on the inner wall of the filter membrane tube 33, preventing the gas (harmful gas) inside the filter membrane tube 33 from reacting with the filter. When the membrane tube 33 is in contact with the tube wall and the exhaust module 5 is turned on, because the exhaust volume exceeds the intake volume, the detection chamber 2 draws in the gas (harmful gas) around the detection point through the sampling pipe module 3. The harmful gas enters the filter membrane tube 33 and is isolated from the tube wall by the gas membrane. During the process of entering the detection chamber 2 along the sampling pipe module 3, it is mixed and diluted by the gas membrane and then sent into the detection chamber 2. The concentration of harmful gas is measured by the detection component 1 (because the harmful gas is diluted, the gas concentration after measurement needs to be converted to eliminate the influence of the sent gas). After detection, the gas is treated by the exhaust module 5 and then discharged.

[0032] As attached Figure 2 Appendix Figure 5 Appendix Figure 6 As shown, the detection chamber 2 includes a detection box 21, which is connected to one end of the sampling tube 31 and has a support frame 22 inside. The support frame 22 is a square box-shaped frame structure, and a filter membrane box 23 that fits with the detection box 21 is installed inside. One side of the filter membrane box 23 is connected to one end of the filter membrane tube 33. A positioning installation tube 26 is provided on the top of the detection box 21. A return port 24 is provided on the detection box 21 on one side of the positioning installation tube 26 (the return port 24 is located between the positioning installation tube 26 and the exhaust module 5). The bottoms of the positioning installation tube 26 and the return port 24 are respectively connected to the filter membrane box 23.

[0033] As attached Figure 2 Appendix Figure 3 Appendix Figure 4As shown, the detection component 1 includes an instrument section 11, which includes a rear cover 111. The front of the rear cover 111 is open and has a front cover 112. A wiring port 14 is provided on one side, and an audible and visual alarm 15 is provided on the other side. A control chip 113 is provided inside the rear cover 111, and a mounting box 115 arranged horizontally at the bottom is provided. A display screen 114 is provided on the front cover 112. A diffusion module 12 and a pump-suction module 13 are provided at the bottom of the mounting box 115. The diffusion module 12 includes a diffusion chamber 121 provided at the front end of the mounting box 115. The bottom of the diffusion chamber 121 is open and has a diffusion filter membrane 123. A diffusion sensor 122 is provided inside (the diffusion sensor 122 is a multi-gas concentration sensor that can measure the concentration of multiple gases, including nitrogen oxides). The sensor is used for detecting harmful gases such as aldehyde concentration, fluoride concentration, etc., as well as conventional gases such as oxygen concentration, nitrogen concentration, carbon dioxide concentration, etc.); the pump-suction module 13 includes a pump suction chamber 131 sleeved and fixed in the positioning installation tube 26. The bottom of the pump suction chamber 131 is open and a pump suction filter membrane 134 is provided. A self-priming pump 132 is provided in the pump suction chamber 131. An exhaust nozzle 135 is provided on one side of the self-priming pump 132 through the pump suction chamber 131. A return pipe 25 connected to the return interface 24 is provided on the exhaust nozzle 135. A pump suction sensor 133 is provided between the self-priming pump 132 and the pump suction filter membrane 134 (the pump suction sensor 133 is a combined sensor of multiple gas concentration sensors, which can measure the concentration of multiple gases and has the same function as the diffusion sensor 122).

[0034] In the above description, the detection component 1 detects the surrounding gas through the diffusion module 12. After the gas supply positive pressure module 4 is turned on, the surrounding gas enters between the support pipe 32 and the filter membrane pipe 33, and between the detection box 21 and the filter membrane box 23, forming a positive pressure. This causes the gas to pass through the filter membrane pipe 33 and the filter membrane box 23 to form a gas film. After the exhaust module 5 is turned on, the gas (harmful gas) around the detection point is drawn into the filter membrane box 23 together with the gas forming the gas film through the sampling pipe module 3 by the air volume difference. The gas is then processed and discharged by the exhaust module 5. When the gas (harmful gas) around the detection point passes through the filter membrane box 23, the detection component 1 collects and detects it through the pump suction module 13 to obtain the diluted harmful gas concentration. After conversion, the harmful gas concentration of the original gas (harmful gas) around the detection point is displayed on the display screen 114. When the harmful gas concentration exceeds the set value, the detection component 1 controls the audible and visual alarm 15 to sound and flash, providing an alarm prompt to the surrounding personnel.

[0035] As attached Figure 2 Appendix Figure 5 Appendix Figure 6As shown, the positive pressure air supply module 4 includes a static pressure air box 41. The static pressure air box 41 has multiple static pressure baffles 43 arranged along its inner edge (the static pressure baffles 43 are plates with a large number of ventilation holes), and an air intake fan 44 is provided at the bottom. The top is provided with multiple air supply pipes 45 connected to the detection box 21, and mounting holes 42 for screw fixing are provided on the left and right sides respectively.

[0036] As attached Figure 2 Appendix Figure 5 Appendix Figure 6 As shown, the filter module 6 includes a filter box 61 located at the bottom of the static pressure air box 41. The bottom of the filter box 61 is open and has an air inlet window 62. A dust removal filter element 63 is horizontally arranged inside the filter box 61.

[0037] As described above, after the intake fan 44 is started, the surrounding gas (considered as clean air free of harmful gases) passes through the intake window 62 and enters the filter box 61, where it is filtered by the dust removal filter element 63 to remove dust, reducing dust accumulation in the static pressure box 41 and on the outer wall of the filter membrane tube 33, preventing the filter membrane tube 33 from becoming clogged and affecting air permeability, thereby extending the service life of components such as the filter membrane tube 33. After dust removal, the gas enters the larger static pressure box 41. Due to the change in volume and the obstruction of the static pressure baffle 43, its own speed and dynamic pressure decrease. It is then sent into the detection box 21 through the air supply pipe 45, forming a positive pressure between the support pipe 32 and the filter membrane tube 33, and between the detection box 21 and the filter membrane box 23. Since the gas pressure is mainly static pressure, the gas is more evenly distributed between the support pipe 32 and the filter membrane tube 33.

[0038] As attached Figure 2 Appendix Figure 5 Appendix Figure 6 As shown, the exhaust module 5 includes an exhaust box 51, an activated carbon filter plate 53 is provided inside the exhaust box 51, and a pipe is provided on one side that passes through the detection box 21 and connects to the filter membrane box 23. An exhaust fan 52 is provided on the other side. The exhaust volume of the exhaust fan 52 is greater than the intake volume of the intake fan 44.

[0039] As described above, after the exhaust fan 52 is turned on, it draws the gas (harmful gas) around the detection point and the gas that has not formed an air film into the exhaust box 51. The harmful gas is then adsorbed and filtered by the activated carbon filter plate 53 to prevent the harmful gas from being discharged into the space around the equipment. If the processing capacity of the activated carbon filter plate 53 is insufficient, a pipeline can be added to transfer the detected gas to the waste gas system for treatment.

[0040] As described above, all components and usage methods of the detection component 1 are existing mature technologies familiar to the general public. Based on data such as the intake volume of the intake fan 44, the exhaust volume of the exhaust fan 52, and the detection concentration of the diffusion module 12, the dilution coefficient of the gas (harmful gas) around the detection point is calculated (gas extraction volume around the detection point = exhaust volume of the exhaust fan 52 - intake volume of the intake fan 44). The dilution coefficient is then appropriately corrected according to the actual usage to make the detection data of the detection component 1 more accurate.

[0041] In the specific implementation of this embodiment:

[0042] When the intake fan 44 and exhaust fan 52 are turned on, the air around the equipment passes through the filter module 6 for dust removal, and then its dynamic pressure is reduced by the static pressure box 41 before being sent into the detection box 21. This increases the air pressure between the detection box 21 and the filter membrane box 23, as well as between the support tube 32 and the filter membrane tube 33. Under the pressure difference, the air between the detection box 21 and the filter membrane box 23 passes through the side wall of the filter membrane box 23 and enters the filter membrane box 23. The air between the support tube 32 and the filter membrane tube 33 passes through the tube wall of the filter membrane tube 33 and enters the filter membrane tube 33, forming air films to prevent harmful gases from contacting the filter membrane tube 33 or the filter membrane box 23. At the same time, under the action of the exhaust fan 52, the air around the detection point is drawn into the filter membrane box 23 along the filter membrane tube 33, and is diluted and mixed by the gas film formed during the process, reducing its own corrosion or backflow. The gas passes through the filter membrane box 23 and enters the exhaust box 51 where it is adsorbed and filtered by the activated carbon filter plate 53 to remove harmful gas components. Finally, it is discharged through the exhaust fan 52. During the process, the detection component 1 measures the gas concentration around the equipment through the diffusion module 12 and measures the gas concentration (harmful gas) around the diluted detection point through the pump suction module 13. Based on the air intake of the intake fan 44, the exhaust volume of the exhaust fan 52, and the concentration detected by the diffusion module 12, the gas concentration (harmful gas) around the original detection point is converted and displayed on the display screen 114. When the concentration of harmful gas exceeds the set value, the detection component 1 controls the audible and visual alarm 15 to sound and flash to alert the surrounding personnel.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An indoor harmful gas concentration measuring device, characterized in that, include: The detection component (1) includes an instrument section (11), a diffusion module (12) and a pump suction module (13) are provided at the bottom of the instrument section (11), and a detection air chamber (2) is provided at the detection end of the pump suction module (13). The detection chamber (2) is provided with a sampling pipeline module (3) on one side and an exhaust module (5) on the other side, and a positive pressure air supply module (4) is provided at the bottom. A filter module (6) is provided at the bottom of the positive pressure air supply module (4). The sampling pipeline module (3) includes a sampling tube (31), a support tube (32) is provided inside the sampling tube (31), one end of which is connected to the detection air chamber (2), and the other end is provided with a sealing ring (34) connected to the corresponding end of the support tube (32). The support tube (32) is a frame structure with hollowed-out pipe wall, and a filter membrane tube (33) is sleeved and fixed inside. After the support tube (32) and the filter membrane tube (33) form positive pressure through the gas supply positive pressure module (4), the gas passes through the pipe wall of the filter membrane tube (33) and forms a gas film on the inner wall of the filter membrane tube (33).

2. The indoor harmful gas concentration measuring device according to claim 1, characterized in that: The detection chamber (2) includes a detection box (21), which is connected to one end of the sampling tube (31) and has a support frame (22) inside. The support frame (22) is a square box-shaped frame structure and has a filter membrane box (23) that fits the detection box (21) with a gap. One side of the filter membrane box (23) is connected to one end of the filter membrane tube (33).

3. The indoor harmful gas concentration measuring device according to claim 2, characterized in that: The pump-suction module (13) includes a pump suction chamber (131), the bottom of which is open and equipped with a pump suction filter membrane (134), and the bottom passes through the top wall of the detection box (21) and is connected to the filter membrane box (23). A self-priming pump (132) is installed inside the pump suction chamber (131), and an exhaust nozzle (135) is installed on one side of the self-priming pump (132) through the pump suction chamber (131), and a pump suction sensor (133) is installed between the self-priming pump (132) and the pump suction filter membrane (134).

4. The indoor harmful gas concentration measuring device according to claim 2, characterized in that: The positive pressure air supply module (4) includes a static pressure box (41), with multiple static pressure baffles (43) arranged along the inner edge of the static pressure box (41), an air intake fan (44) at the bottom, and multiple air supply pipes (45) connected to the detection box (21) at the top.

5. The indoor harmful gas concentration measuring device according to claim 4, characterized in that: The filter module (6) includes a filter box (61) located at the bottom of the static pressure box (41). The bottom of the filter box (61) is open and has an air inlet window (62). A dust removal filter element (63) is horizontally arranged inside the filter box (61).

6. The indoor harmful gas concentration measuring device according to claim 2, characterized in that: The exhaust module (5) includes an exhaust box (51), an activated carbon filter plate (53) is provided inside the exhaust box (51), and a pipe is provided on one side that passes through the detection box (21) and connects to the filter membrane box (23), and an exhaust fan (52) is provided on the other side.

Images