Opposite flushing type diluting device for aerosol sampling

Abstract

The utility model relates to a hedging type diluting device for aerosol sampling. The hedging type diluting device comprises an outer diluting shell and an inner diluting shell embedded in the outer diluting shell. The dilution outer shell comprises an outer shell main body as well as a sample inlet and a sampling port which are respectively formed in two ends of the outer shell main body. The dilution inner shell comprises an anti-backflow cavity; the anti-backflow chamber is provided with a hedging dilution port; a clean gas inlet pipe is arranged on the anti-backflow cavity and is used for introducing clean gas into the anti-backflow cavity from the outer side of the dilution outer shell. The utility model aims to reduce the use cost and difficulty, widen the application range and realize accurate sampling and dilution of high-concentration aerosol through the measures of optimizing a mixing mechanism, preventing backflow design, simplifying the operation process and the like so as to meet different research and monitoring requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to a counter-hedge dilution device for aerosol sampling. Background Art

[0002] With the continuous development of environmental science, public health, and air pollution research, aerosol sampling and analysis has become an important means of obtaining key data such as ambient air quality and pollution source emission characteristics. Aerosols are solid or liquid particles suspended in a gas medium, with a wide range of particle sizes, ranging from a few nanometers to hundreds of microns.

[0003] During aerosol sampling, high-concentration aerosols often need to be diluted to meet the sample concentration requirements of the analytical instrument. However, existing aerosol sampling and dilution devices have the following shortcomings in practical applications:

[0004] (1) Poor mixing effect: The internal structure design of some dilution devices is unreasonable, resulting in insufficient mixing of aerosol and dilution gas, the existence of mixing blind spots or dead zones, and reduced representativeness of the sample.

[0005] (2) Backflow is prone to occur: During the high-concentration aerosol sampling process, if the dilution device is not designed properly, the aerosol is prone to backflow into the dilution gas inlet channel, which not only pollutes the sampling environment but also may cause damage to the sampling equipment.

[0006] (3) Complex operation: Some dilution devices have complex structures and cumbersome operations, requiring professional personnel to operate and maintain them, which increases the cost and difficulty of use.

[0007] (4) Limited scope of application: Traditional dilution devices are often designed for specific types of aerosols or analytical instruments, lacking versatility and flexibility, and are difficult to meet diverse sampling needs. Utility Model Content

[0008] In order to solve the deficiencies in the prior art, the purpose of the present utility model is to provide a counter-dilution device for aerosol sampling.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A counter-dilution device for aerosol sampling comprises an outer dilution shell and an inner dilution shell embedded in the outer dilution shell.

[0011] The dilution outer shell comprises an outer shell body and an injection port and a sampling port respectively arranged at two ends of the outer shell body.

[0012] The dilution inner shell includes an anti-backflow chamber; the anti-backflow chamber is provided with a counter-dilution port; the anti-backflow chamber is provided with a clean air inlet pipe, and the clean air inlet pipe is used to pass clean air from the outside of the dilution outer shell into the anti-backflow chamber.

[0013] According to the preferred embodiment of the present invention, the injection port, the counter-dilution port and the sampling port are coaxially arranged.

[0014] According to the preferred embodiment of the present invention, the dilution inner shell is installed in the dilution outer shell by fixing screws; the fixing screws include fixing screw 1 and fixing screw 2.

[0015] According to the preferred embodiment of the present invention, one end of the clean air inlet pipe extends into the anti-backflow chamber, and the other end is installed on the dilution outer shell and is connected to the clean air source.

[0016] Preferably, according to the present invention, the clean gas inlet pipe, the fixing screw 1 and the fixing screw 2 are all perpendicular to the sample gas inlet direction, and the angles between any two of them are 120 degrees.

[0017] According to the preferred embodiment of the present invention, the injection port and the sampling port are both hollow cylinders.

[0018] Preferably, according to the present invention, the outer shell body includes a first outer shell cavity, a second outer shell cavity and a third outer shell cavity connected in sequence; the first outer shell cavity and the third outer shell cavity are both hollow truncated cones; the second outer shell cavity is hollow cylindrical.

[0019] According to the preferred embodiment of the present invention, the backflow prevention chamber includes a first inner shell cavity and a second inner shell cavity connected in sequence; the first inner shell cavity is a hollow frustum, the second inner shell cavity is a hollow cylinder, and one end thereof is connected to the first inner shell cavity, and the other end is provided with a conical plug.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The present utility model innovatively introduces counter-hedge mixing technology, and combines fluid mechanics to design parallel mixing and turbulent re-mixing structures to optimize mixing efficiency. At the same time, the anti-backflow chamber is cleverly designed to effectively prevent aerosol particles and pollutants in the sample gas from entering the clean gas system through the counter-hedge dilution port, thereby ensuring gas purity. In addition, through the streamlined structural design, the ultimate convenience of operation is achieved. Users only need to connect a single clean gas source to quickly start the equipment, eliminating the complex pre-processes such as power supply and preheating. In summary, the present utility model not only greatly reduces the operating cost and operating difficulty of the equipment, but also significantly broadens its application field. It can accurately sample and dilute high-concentration aerosols, fully meeting the stringent needs of diversified research and environmental monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the counter-hedge dilution device used for aerosol sampling in the present utility model;

[0023] Figure 2 It is a structural diagram of the inner shell.

[0024] in:

[0025] 1. Inlet, 2. Dilution outer shell, 3. Counter-dilution port, 4. Dilution inner shell, 5. Clean gas inlet pipe, 6. Anti-backflow chamber, 7. Sampling port, 8. Fixing screw 1, 9. Fixing screw 2. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] like Figure 1 and Figure 2 The illustrated counter-dilution device for aerosol sampling includes an outer dilution shell 2 and an inner dilution shell 4 embedded in the outer dilution shell 2 .

[0028] The dilution outer shell 2 includes an outer shell body and an injection port 1 and a sampling port 7 respectively arranged at two ends of the outer shell body.

[0029] The dilution inner shell 4 includes an anti-backflow chamber 6; an anti-backflow chamber is provided in the inner shell. At high sampling flow rates, aerosol particles and pollutants in the sample gas may be easily mistakenly rushed to the counter-dilution port due to inertia. In order to effectively prevent this potential pollution risk, an anti-backflow chamber is carefully designed in the counter-dilution device. This chamber can cleverly utilize the principles of fluid dynamics so that pollutants entering it cannot continue to invade the clean gas path system after losing inertia, thereby thoroughly guaranteeing the purity of the clean gas and ensuring the accuracy of the dilution process. This design not only maintains the accuracy of the dilution ratio, but also helps to improve the operating efficiency and stability of the overall system, significantly extending the service life of the system.

[0030] The anti-backflow chamber 6 is provided with a counter-dilution port 3 ; the anti-backflow chamber 6 is provided with a clean air inlet pipe 5 , which is used to introduce clean air from the outside of the dilution outer shell 2 into the anti-backflow chamber 6 .

[0031] According to the preferred embodiment of the present invention, the inlet 1, the counter-dilution port 3, and the sampling port 7 are coaxially arranged. This arrangement cleverly utilizes the high-speed relative flow between the sample gas at the inlet and the clean gas at the counter-dilution port, rapidly achieving a highly mixed state through the strong impact effect. This mixing method significantly increases the contact surface area between the fluids, and due to the continuous replenishment of the fluids, the contact surface is constantly renewed, thereby achieving a continuous and efficient mixing effect.

[0032] According to a preferred embodiment of the present invention, the dilution inner shell 4 is mounted within the dilution outer shell 2 via fixing screws; the fixing screws include fixing screw 1 8 and fixing screw 2 9. The dilution inner shell 4 and the outer shell 2 create a cavity area. When the mixed gas enters this area, the two-phase fluid flows in parallel with similar flow directions, forming a stable parallel flow state, thereby further enhancing the uniformity of mixing. According to a preferred embodiment of the present invention, one end of the clean gas inlet pipe 5 extends into the anti-backflow chamber 6, and the other end is installed through the dilution outer shell 2 and connected to the clean gas source.

[0033] According to the preferred embodiment of the present invention, the clean air inlet pipe 5, fixing screw one 8 and fixing screw two 9 are all perpendicular to the sample gas inlet direction, and the angles between any two of them are all 120 degrees. The clean air inlet pipe 5, fixing screw one 8 and fixing screw two 9 are installed at intervals of 120° perpendicular to the sample gas inlet direction, which can ensure that the sample inlet 1, the counter-dilution port 3 and the sampling port 7 are coaxially arranged. In order to ensure the consistency of the mixed air flow, the clean air inlet pipe, fixing screw one and fixing screw two are designed to be evenly arranged so that they have a balanced effect on the mixed gas flowing through. When the mixed gas flows around these structural parts, a turbulent effect will naturally occur. This phenomenon not only optimizes the flow path of the fluid, but also significantly improves the overall mixing effect.

[0034] According to the preferred embodiment of the present invention, the injection port 1 and the sampling port 7 are both hollow cylinders.

[0035] Preferably, according to the present invention, the outer shell body includes a first outer shell cavity, a second outer shell cavity and a third outer shell cavity connected in sequence; the first outer shell cavity and the third outer shell cavity are both hollow truncated cone-shaped; the second outer shell cavity is hollow cylindrical. The anti-backflow chamber includes a first inner shell cavity and a second inner shell cavity connected in sequence; the first inner shell cavity is hollow truncated cone-shaped, the second inner shell cavity is hollow cylindrical, and one end thereof is connected to the first inner shell cavity, and the other end is provided with a conical plug. The inner wall of the dilution outer shell and the outer wall of the dilution inner shell both adopt a conical surface design, which can prevent the existence of mixing blind spots or dead zones, making the dilution and mixing more sufficient.

[0036] The working process of this utility model is:

[0037] S1. Connect the sampling port 1 to the aerosol sampling source to be diluted, connect the sampling port 7 to the sampling port of the sampling equipment, connect the clean air source to the clean air inlet pipe, and start the device to work.

[0038] S2. The clean air enters the anti-backflow chamber 6 through the clean air inlet pipe, and is then ejected from the counter-dilution port 3 at high speed.

[0039] S3. The sampled gas enters the device through the sampling port 7 and collides violently with the high-speed clean airflow ejected from the counter-dilution port 3. With the help of this strong impact effect, the two quickly and efficiently reach a highly mixed state.

[0040] S4. The mixed gas enters the cavity area between the dilution outer shell 2 and the dilution inner shell 4. In this area, the two-phase fluid flows in parallel with similar flow directions, forming a stable parallel flow state, thereby further enhancing the uniformity of mixing.

[0041] S5. When the mixed gas flows around the clean gas inlet pipe 5, fixing screw 1 8, fixing screw 2 9 and other structural parts, a turbulent effect will naturally occur. This phenomenon not only optimizes the flow path of the fluid, but also significantly improves the overall mixing effect.

[0042] S6. Finally, the fully diluted and mixed sampling aerosol airflow is discharged smoothly from the sampling port for accurate sampling and analysis by downstream measuring equipment.

[0043] In summary, the present invention aims to improve the accuracy and reliability of aerosol sampling, reduce the cost and difficulty of use, and broaden its scope of application by optimizing the mixing mechanism, preventing backflow design, and simplifying the operating process.

[0044] The above-described embodiments are merely descriptions of preferred implementation methods of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A counter-dilution device for aerosol sampling, characterized in that: It comprises a dilution outer shell (2) and a dilution inner shell (4) embedded in the dilution outer shell (2); The dilution outer shell (2) comprises an outer shell body and an injection port (1) and a sampling port (7) respectively arranged at two ends of the outer shell body; The dilution inner shell (4) includes an anti-backflow chamber (6); the anti-backflow chamber (6) is provided with a counter-dilution port (3); the anti-backflow chamber (6) is provided with a clean air inlet pipe (5), and the clean air inlet pipe (5) is used to pass clean air from the outside of the dilution outer shell (2) into the anti-backflow chamber (6).

2. The counter-dilution device for aerosol sampling according to claim 1, characterized in that: The injection port (1), the counter-dilution port (3) and the sampling port (7) are coaxially arranged.

3. The counter-dilution device for aerosol sampling according to claim 1, characterized in that: The dilution inner shell (4) is mounted inside the dilution outer shell (2) via fixing screws; The fixing screws include a fixing screw 1 (8) and a fixing screw 2 (9).

4. The counter-dilution device for aerosol sampling according to claim 1, characterized in that: One end of the clean air inlet pipe (5) extends into the anti-backflow chamber (6), and the other end is installed through the dilution outer shell (2) and is connected to the clean air source.

5. The counter-dilution device for aerosol sampling according to claim 3, characterized in that: The clean gas inlet pipe (5), the fixing screw 1 (8) and the fixing screw 2 (9) are all perpendicular to the sample gas inlet direction, and the angles between any two of them are all 120 degrees.

6. The counter-dilution device for aerosol sampling according to claim 1, characterized in that: The injection port (1) and the sampling port (7) are both hollow cylinders.

7. The counter-dilution device for aerosol sampling according to claim 1, characterized in that: The outer shell body includes a first outer shell cavity, a second outer shell cavity and a third outer shell cavity connected in sequence; the first outer shell cavity and the third outer shell cavity are both hollow truncated cone-shaped; the second outer shell cavity is hollow cylindrical.

8. The counter-dilution device for aerosol sampling according to claim 1, characterized in that: The anti-backflow chamber (6) comprises a first inner shell cavity and a second inner shell cavity connected in sequence; The first inner shell cavity is in the shape of a hollow truncated cone, and the second inner shell cavity is in the shape of a hollow cylinder, one end of which is connected to the first inner shell cavity, and the other end of which is provided with a conical plug.

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