Efficient low-concentration gas sampling device
Through the gas sampling device designed with spherical screen and barrier components, the problem of low sampling efficiency of low concentration gas in the prior art is solved, and efficient and fast gas sampling is achieved, especially in a clean room environment, which significantly shortens the sampling time.
Patent Information
- Application Number
- CN202422230894.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-11
AI Technical Summary
Existing gas sampling devices are inefficient when monitoring low-concentration pollutants, especially in clean room environments. The sampling time is too long to meet the sensitivity requirements of modern instruments.
The gas sampling device designed with spherical screen and barrier components is adopted. The spherical screen disperses the gas to form small bubbles, increases the contact area, and the barrier components extend the residence time of the gas in the absorbing liquid and improves the absorption efficiency.
It significantly improves gas absorption efficiency and shortens sampling time from 20 hours to 1-5 hours. It is suitable for fast and efficient sampling of trace-level gas pollutants.
Smart Images
Figure CN223064912U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas sampling, and particularly relates to an efficient low-concentration gas sampling device. Background Art
[0002] When the concentration of pollutants in the atmosphere is very low, certain means need to be taken to concentrate the pollutants in the atmosphere (concentration sampling method) in order to meet the requirements of the sensitivity of the monitoring method; the concentration sampling method takes a long time. Especially when measuring the air environment in a clean room (FAB), the trace measurement (ppt) method is usually adopted. In order to meet the requirements of the sensitivity of the measuring instrument, the sampling time needs to be very long to increase the concentration of the sample; the solution absorption method is one of the trace measurement methods and is used to collect gas pollutants that can be dissolved in liquids.
[0003] At present, the absorption tubes (bottles) used in the solution absorption method include bubble absorption tubes, porous sieve plate absorption tubes and impact absorption tubes; for current trace measurements, the sampling time is very long; the absorption efficiency of the solution absorption method mainly depends on the absorption speed, and the absorption speed depends on the dissolution speed of the absorption liquid for the substance to be measured, the contact area and contact time between the substance to be measured and the absorption liquid; the existing gas sampling device is connected with a suction pump, the air inlet of the absorption tube is connected with the suction pump, the gas to be sampled enters from the absorption tube, forms bubbles that overflow from the bottom of the absorption liquid and rise straight through the absorption liquid. The bubble diameter is large, the contact surface with the absorption liquid is small, and the contact time is short. During the contact process between the bubbles and the absorption liquid, the target sampling substance is absorbed by the absorption liquid, and the absorption efficiency is not high; the porous sieve plate absorption tube in the prior art disperses the absorption bubble diameter through a porous plate, increases the contact surface between the bubbles and the absorption liquid, reduces the particle size while increasing the contact time of the bubbles in the absorption liquid, and improves the absorption rate of the bubble absorption tube; the sampling time is reduced, but it is still very long; for the measurement of trace-level (ppt) gas pollutants in a clean room, with the current gas sampling technology (sampling bottle), generally 20 hours of sampling time is required to meet the requirements of the sensitivity of the current most advanced instrument (ion chromatograph ICS6000); on this premise, how to improve the absorption efficiency and reduce the sampling time is an urgent technical problem in the industry.
[0004] Based on this, an efficient low-concentration gas sampling device is needed to solve the above problems. Summary of the Utility Model
[0005] The purpose of the utility model is to provide an efficient low-concentration gas sampling device, and the purpose of the utility model is realized by adopting the following technical solutions:
[0006] The utility model provides an efficient low-concentration gas sampling device, including,
[0007] An intake pipe, the intake port of the intake pipe is connected to the gas to be sampled, a spherical sieve is provided at the lower end of the intake pipe, the spherical sieve is provided with air holes, and the spherical sieve is used to disperse the gas to be sampled;
[0008] An absorption tube, the absorption tube is sleeved outside the intake pipe, the absorption tube is filled with an absorption liquid, and the exhaust port of the absorption tube discharges the sampled gas;
[0009] Wherein, at least one blocking member is provided on the inner wall of the absorption tube or the outer wall of the intake pipe.
[0010] Furthermore, the material of the absorption tube or the intake pipe is plastic, PFA, PTFE or glass.
[0011] Preferably, the air holes of the spherical sieve are circular or conical.
[0012] Furthermore, the ratio of the diameter of the spherical sieve to the diameter of the intake pipe is 1:1.5 to 1:3.
[0013] Furthermore, the blocking member is inclined downward or upward, and the angle between the blocking member and the horizontal line is 0° to 45°.
[0014] Furthermore, the width of the blocking member is 1 to 5 millimeters.
[0015] Preferably, the distance between the inner wall of the absorption tube and the outer wall of the intake pipe is less than 1 centimeter.
[0016] Preferably, at least one blocking member is provided on both the inner wall of the absorption tube and the outer wall of the intake pipe, and the blocking members of adjacent layers are arranged parallel or staggered in the vertical direction.
[0017] Furthermore, at least one blocking member is provided on both the inner wall of the absorption tube and the outer wall of the intake pipe, the blocking members of adjacent layers are arranged parallel in the vertical direction, and there is a gap between the blocking members of adjacent layers.
[0018] Furthermore, at least one blocking member is provided on both the inner wall of the absorption tube and the outer wall of the intake pipe, and the blocking members of adjacent layers are arranged staggered in the vertical direction.
[0019] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification at least include:
[0020] First, in the present utility model, by providing a spherical sieve at the lower end of the intake pipe and adding air holes with circular openings or conical openings, the gas is dispersed into more small bubbles, thereby increasing the contact area between the gas and the absorption liquid.
[0021] Second, the utility model is provided with a blocking component on the absorption tube and the intake pipe. When the gas to be sampled enters the absorption liquid, due to the spherical structure and the design of the blocking component on the inner wall of the absorption tube or the outer wall of the intake pipe, the rapid rise of the gas is hindered, the residence time of the gas in the absorption liquid is prolonged, and the absorption efficiency is further improved; the absorption efficiency of the gas to be sampled in the liquid is significantly improved, and the suction flow rate is increased to 3 - 4 liters per minute. Compared with 1 - 2 liters per minute in the prior art, the gas sampling volume is increased, so that the original sampling time of 20 hours is shortened to 1 - 5 hours. Brief Description of the Drawings
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 It is a schematic structural diagram of a gas sampling device in the prior art;
[0024] Figure 2 It is a schematic structural diagram of the first embodiment of the high - efficiency low - concentration gas sampling device of the present utility model;
[0025] Figure 3 It is a schematic structural diagram of the second embodiment of the high - efficiency low - concentration gas sampling device of the present utility model.
[0026] Description of the Reference Numerals in the Drawings
[0027] 1. Intake pipe; 2. Absorption tube; 21. Spherical sieve; 211. Air holes; 3. Blocking component. Detailed Embodiments
[0028] The following will describe the embodiments of the present utility model in detail with reference to the drawings.
[0029] The following specific examples illustrate the embodiments of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. The present utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.
[0030] Moreover, in the description of this specification, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances and should not be construed as a limitation to this utility model. In this application, the "width" refers to the distance that the blocking member 3 extends from the inner wall of the absorption tube 2 to the outer wall of the intake pipe 1 or the distance that the blocking member 3 extends from the outer wall of the intake pipe 1 to the inner wall of the absorption tube 2. The "interlayer distance" represents the distance between the inner wall of the absorption tube 2 and the outer wall of the intake pipe 1. "Adjacent two layers" refers to the two layers of the bottle wall of the absorption tube 2 and the bottle wall of the intake pipe 1.
[0031] The solution absorption method in the prior art mainly depends on the absorption rate, and the absorption rate is affected by the dissolution rate of the absorption liquid for the target substance, the contact area and contact time between the gas and the absorption liquid. The current bubble absorption tubes 2, porous sieve plate absorption tubes 2, and impinger absorption tubes 2 have low efficiency in gas sampling. Especially when measuring trace gas pollutants in a clean room, the sampling time is still relatively long. Therefore, how to further improve the absorption efficiency and shorten the sampling time has become a key problem that urgently needs to be solved in the current gas sampling technology.
[0032] Based on this, the embodiments of this specification propose an efficient low-concentration gas sampling device. As Figure 2 shown in the gas sampling device of the first embodiment of this utility model, this device significantly improves the gas absorption efficiency and reduces the sampling time through the improvement of the existing absorption tube 2. The gas sampling device includes an absorption tube 2 and an intake pipe 1. The absorption tube 2 is sleeved outside the intake pipe 1 and filled with an absorption liquid. The interlayer distance between the intake pipe 1 and the absorption tube 2 is less than 1 cm. The absorption tube 2 is made of glass, and several blocking members 3 are provided on the inner wall. The width of the blocking member is 1 - 5 mm. The lower end of the intake pipe 1 includes a spherical sieve 21, and several air holes 211 are distributed on the spherical sieve 21. The air holes 211 are circular openings with a diameter of 0.1 - 5 mm for dispersing gas. During operation, the air pump introduces the gas to be sampled from the intake pipe 1. The gas forms small bubbles through the air holes 211 of the spherical sieve 21 and enters the absorption tube 2, and is discharged through the air outlet of the absorption tube 2 after fully contacting the absorption liquid in the absorption tube 2. Due to the porous design of the spherical sieve 21, the bubble diameter is greatly reduced, significantly increasing the contact area between the gas and the absorption liquid. At the same time, the blocking members 3 on the inner wall of the absorption tube 2 hinder the rapid rise of the bubbles, prolonging the contact time of the gas in the absorption liquid and further improving the absorption efficiency.
[0033] In this solution, the contact efficiency between gas and absorption liquid is greatly improved through the design of spherical screen 21 and blocking component 3; compared with the traditional bubble absorption tube 2 and porous sieve plate absorption tube 2, the absorption efficiency is increased by about 3 times, and the sampling time is shortened to less than 1 / 5. It is suitable for fast and efficient sampling of trace-level gas pollutants, especially in clean rooms and other environments with high requirements for gas detection accuracy, and has significant application advantages.
[0034] In a preferred embodiment, the air hole 211 is a conical opening; the pollutants in the gas to be sampled are liquid or solid suspended particles, called aerosols, and the air sieve holes on the spherical lower end of the air inlet pipe 1 are preferably conical nozzles; the conical nozzle has a small aperture and is close to the bottle wall. When the sampled gas is quickly ejected from the nozzle toward the bottle wall, the aerosol particles impact the bottle wall due to inertia and are dispersed, thereby being easily absorbed by the absorption liquid.
[0035] In this scheme, when the particles in the aerosol pass through the conical nozzle, due to the small aperture and the close distance to the bottle wall, the particles will hit the bottle wall due to inertia, causing the particles to be dispersed, increasing the contact area between the particles and the absorption liquid, and improving the absorption efficiency; the liquid or solid particles in the aerosol are ejected at high speed through the conical nozzle, and quickly lose kinetic energy when approaching the bottle wall, and are captured by the absorption liquid, reducing the possibility of particle escape, thereby ensuring the accuracy of sampling; the design of the conical nozzle enables the particles to be effectively separated and dispersed when entering the absorption bottle, which enables the absorption liquid to absorb these particles more quickly and evenly, shortening the sampling time and improving the sampling efficiency; compared with ordinary circular apertures, conical nozzles are more suitable for collecting gases with particles such as aerosols, especially in the case of high-speed suction, which can ensure that the particles will not escape with the gas.
[0036] It should be noted that the conical nozzle is not suitable for collecting gaseous and vaporous substances because the inertia of gas molecules is small and they are easy to escape with the air under rapid vacuum conditions; the size of the conical nozzle aperture and the distance between the nozzle and the bottle wall determine the aerosol absorption efficiency; when the gas pollutants are in a gaseous or vaporous state, the air holes 211 on the spherical screen 21 of the air inlet pipe 1 can be designed as circular openings.
[0037] In a preferred embodiment, Figure 2 The result schematic diagram of the gas sampling device of the second embodiment of the utility model is shown. The inner wall of the absorption tube 2 is not provided with a blocking component 3, while the outer wall of the air inlet pipe 1 is provided with 1-4 blocking components 3, forming resistance to slow down the rising speed of the gas; the residence time of the gas in the absorption liquid is thereby increased, thereby extending the contact time between the gas and the absorption liquid and improving the absorption efficiency.
[0038] It should be noted that in the second embodiment, 1-4 blocking components 3 can also be provided on the outer wall of the intake pipe 1 on the basis of the first embodiment, and the blocking components 3 on the outer wall of the intake pipe 1 and the blocking components 3 on the inner wall of the absorption pipe 2 are arranged staggeredly in the vertical direction. Through the staggeredly arranged blocking components 3, the gas cannot rise rapidly along a straight path, reducing the chance of unabsorbed gas escaping, and further ensuring that the target substances in the gas can be fully absorbed by the absorption liquid.
[0039] In a preferred embodiment, the blocking components 3 of the second embodiment can also be arranged parallel in the vertical direction, but there is a certain gap between adjacent blocking components 3.
[0040] Through the technical solution of the embodiment of the present invention, the absorption efficiency of the gas in the absorption pipe 2 (bubble absorption pipe 2, porous sieve plate absorption pipe 2, and impact absorption pipe 2) used in the solution absorption method can be significantly improved. Therefore, the suction flow rate of the air pump connected to the absorption pipe 2 can be increased to 3-4 liters per minute. Currently, the general suction flow rate is 1-2 liters per minute. Thus, the gas volume collected per hour has increased from the original 60-120 liters to 180-240 liters; therefore, the sampling time is significantly reduced, improving the monitoring efficiency.
[0041] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. An efficient low-concentration gas sampling device, characterized in that, Comprising, An intake pipe, the intake port of the intake pipe is introduced into the gas to be sampled, a spherical sieve is provided at the lower end of the intake pipe, pores are provided on the spherical sieve, and the spherical sieve is used to disperse the gas to be sampled; An absorption tube, the absorption tube is sleeved outside the intake pipe, the absorption tube is filled with an absorption liquid, and the outlet of the absorption tube discharges the sampled gas; Wherein, at least one blocking member is provided on the inner wall of the absorption tube or the outer wall of the intake pipe.
2. The gas sampling device according to claim 1, wherein, The material of the absorption tube or the intake pipe is plastic, PFA, PTFE or glass.
3. The gas sampling device according to claim 1, characterized in that, The pores of the spherical sieve are circular or conical.
4. The gas sampling device according to claim 1, characterized in that, The ratio of the diameter of the spherical sieve to the diameter of the intake pipe is 1:1.5 to 1:
3.
5. The gas sampling device according to claim 1, characterized in that, The blocking member inclines downward or upward, and the angle between the blocking member and the horizontal line is 0° to 45°.
6. The gas sampling device according to any one of claims 1-5, characterized in that The width of the blocking member is 1 to 5 millimeters.
7. The gas sampling device according to claim 6, characterized in that, The interlayer distance between the inner wall of the absorption tube and the outer wall of the intake pipe is less than 1 centimeter.
8. The gas sampling device according to claim 1, wherein At least one blocking member is provided on both the inner wall of the absorption tube and the outer wall of the intake pipe, and the adjacent two layers of the blocking members are arranged parallel or staggered in the vertical direction.
9. The gas sampling device according to claim 1, wherein, At least one blocking member is provided on both the inner wall of the absorption tube and the outer wall of the intake pipe, the adjacent two layers of the blocking members are arranged parallel in the vertical direction, and there is a gap between the adjacent two layers of the blocking members.
10. The gas sampling device according to any one of claims 8 or 9, characterized in that, At least one blocking member is provided on both the inner wall of the absorption tube and the outer wall of the intake pipe, and the adjacent two layers of the blocking members are arranged staggered in the vertical direction.