Divided-flow aerosol diluter device

Abstract

The utility model relates to a split-flow aerosol diluter device which comprises a dilution module, the dilution module comprises a shunting assembly and a dilution assembly; the shunting assembly comprises a first shell and a first sampling tube; the dilution assembly comprises a second shell and a second sampling tube; a sample gas inlet is formed in one end of the first shell, the other end of the first shell is connected with one end of the second shell, and a sample gas outlet is formed in the other end of the second shell; an area between the first shell and the first sampling tube is a flow dividing cavity; the area between the second shell and the second sampling tube is a dilution cavity; the inner cavity of the first sampling tube is communicated with the inner cavity of the second sampling tube, and the inner cavities form a sampling channel. The device has the characteristics of compact structure, convenience in operation, high adaptability, easiness in maintenance and the like. According to the device, the defects in the prior art are effectively overcome, powerful technical support is provided for miniaturization and portability application, and the urgent requirement of the market for products combining high performance and light weight is met.

Description

Technical Field

[0001] This utility model relates to the field of aerosol science and technology, specifically to a split-flow aerosol diluter device. Background Technology

[0002] In the fields of environmental science and industrial monitoring, there is an urgent need for increased precision and range in aerosol particulate matter monitoring. With the rapid development of these fields, directly measuring high-concentration aerosol samples not only makes it difficult to obtain accurate data but may also damage measuring equipment. Therefore, developing an efficient and accurate aerosol dilution device is crucial to improving the accuracy and reliability of monitoring data. Such a device can meet the precise measurement needs for aerosol particulate matter concentration, particle size distribution, and chemical composition in fields such as ambient air quality monitoring, industrial emission control, and public health safety.

[0003] Currently, common dilution methods in aerosol sampling include full-flow dilution, limiting dilution, and split dilution. While full-flow dilution provides relatively accurate measurement results, its complex equipment, high cost, and stringent environmental requirements limit its widespread application. Limiting dilution, although simple to operate, has low dilution efficiency, making it difficult to meet the demands of high-precision measurements. In contrast, split dilution stands out due to its simple structure, low cost, high dilution efficiency, and ease of operation and maintenance. Split dilution allows for precise control of the dilution ratio, effectively handling high-concentration samples while preserving the original characteristics of aerosol particles, making it suitable for various fields such as environmental science, industrial monitoring, and biomedicine.

[0004] While existing split-flow dilution products on the market meet the basic needs of aerosol sampling and analysis to a certain extent, some shortcomings remain, requiring further optimization and improvement. For example, Chinese patent document CN110208165 B discloses a split-flow aerosol diluter. This diluter, under prolonged operation or when dealing with complex aerosol samples, may experience capillary blockage, leading to fluctuations in the dilution ratio and measurement errors. Furthermore, due to structural design limitations, this split-flow diluter exhibits relatively high pipe resistance, placing higher sampling pressure requirements on downstream sampling equipment and limiting its adaptability to various sampling environments. Chinese patent document CN 215262673 discloses a partial-flow dilution sampling system. While this system demonstrates some innovation in design, its structure is relatively complex and its size is large. This not only increases the difficulty of system maintenance but also makes it difficult to meet the current trend of miniaturization and portability.

[0005] With continuous technological advancements and increasingly diverse application demands, the market's need for more compact and easier-to-maintain dilution sampling systems is becoming increasingly urgent. Therefore, how to simplify the structure and reduce the size while maintaining system performance has become a crucial direction for the future optimization and upgrading of this system. Utility Model Content

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a diverter-type aerosol diluter device, which features a compact structure, convenient operation, high adaptability, and easy maintenance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A split-flow aerosol diluter device includes a dilution module; the dilution module includes a split-flow component and a dilution component arranged sequentially; the split-flow component includes a first housing and a first sampling tube embedded inside the first housing; the dilution component includes a second housing and a second sampling tube embedded inside the second housing; one end of the first housing is provided with a sample gas inlet, and the other end is connected to one end of the second housing, and the other end of the second housing is provided with a sample gas outlet; the area between the first housing and the first sampling tube is a split-flow cavity; the area between the second housing and the second sampling tube is a dilution cavity; a split-flow outlet is opened on the outer wall of the end of the first housing connected to the second housing; a dilution inlet is opened on the outer wall of the end of the second housing connected to the first housing; the inner cavity of the first sampling tube is connected to the inner cavity of the second sampling tube, and the inner cavities of the two form a sampling channel.

[0009] According to a preferred embodiment of the present invention, the diversion component and the dilution component are connected by a partition; the partition is annular; the first housing, the second housing, the first sampling tube, and the second sampling tube are all mounted on the partition by welding; the first housing and the second housing are symmetrically arranged about the partition; the first sampling tube and the second sampling tube are symmetrically arranged about the partition.

[0010] According to a preferred embodiment of the present invention, the diversion outlet is connected to a particulate filter via a pipeline, and the diversion outlet is connected to the inlet of the particulate filter; the outlet of the particulate filter is connected to the inlet of the external circulation air pump; and the outlet of the external circulation air pump is connected to the dilution inlet.

[0011] According to a preferred embodiment of the present invention, the first sampling tube and the second sampling tube are coaxially arranged, and their inner cavities are connected to form a sampling channel; the connection point between the first sampling tube and the second sampling tube is located on the inner side of the inner wall of the partition.

[0012] According to a preferred embodiment of the present invention, both the first housing and the second housing include a cylindrical housing portion one, a frustum-shaped housing portion two, and a cylindrical housing portion three arranged sequentially; the diversion outlet is disposed on the housing portion three of the first housing; and the dilution inlet is disposed on the housing portion three of the second housing.

[0013] According to a preferred embodiment of the present invention, both the first sampling tube and the second sampling tube include a sampling section one, a sampling section two, and a sampling section three arranged sequentially; the outer wall of the sampling section one is a first inclined surface parallel to the inner wall of the housing section two; the outer walls of the sampling section two and the sampling section three are both circumferential surfaces parallel to the inner wall surface of the housing section three; the diameter of the outer wall of the sampling section two is larger than the diameter of the outer wall of the sampling section three, and the connection between the sampling section two and the sampling section three is a second inclined surface.

[0014] According to a preferred embodiment of the present invention, an annular slit is formed in the area between the housing portion two of the second housing and the sampling portion one of the second sampling tube.

[0015] According to a preferred embodiment of the present invention, the area enclosed by the shell portion three of the first shell, the second inclined surface of the first sampling tube, the sampling portion three of the first sampling tube, and the partition forms an outlet buffer zone.

[0016] According to a preferred embodiment of the present invention, the housing portion three of the second housing, the second inclined surface of the second sampling tube, the sampling portion three of the second sampling tube, and the area enclosed by the partition plate form an inlet buffer zone.

[0017] According to a preferred embodiment of the present invention, an annular dilution slit is formed in the area between the housing portion of the second housing and the first inclined surface of the second sampling tube.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] (1) This utility model focuses on solving the problems of cumbersome equipment maintenance, limited adaptability and complex structure in the prior art, and on this basis, it innovatively introduces a diversion-type aerosol diluter device. This device allows the particulate filter to be external and independently replaceable, which greatly simplifies the maintenance work and reduces the maintenance cost. At the same time, the addition of an external circulation air pump effectively reduces the pipeline resistance of the diluter, significantly improves its adaptability and flexibility, and enables it to perform well in a variety of application scenarios.

[0020] (2) The present invention optimizes the overall structure of the device and adopts a symmetrical design. This design not only significantly reduces the size of the device and simplifies the structure, but also further reduces the cost of processing, use and maintenance. This allows the diluent device to be easily integrated into other related equipment, greatly expanding its application range and providing efficient and reliable solutions for various application scenarios.

[0021] (3) The present invention employs a unique structural design in the dilution module to ensure that the sampling airflow maintains a stable laminar flow state during the dilution airflow splitting and merging process. This design avoids causing disturbances in the sampling airflow field and effectively prevents additional particulate matter loss due to disturbances. More ingeniously, when the dilution airflow merges through the annular dilution slit, it tightly wraps around the periphery of the sampling airflow. This design not only reduces the adverse effects of the wall effect but also promotes the realization of isokinetic sampling. This series of innovative designs work together to significantly improve the measurement accuracy and reliability of the back-end equipment, providing users with more accurate and reliable detection results. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the split-flow aerosol diluter device in this utility model;

[0023] Figure 2 This is a schematic diagram of the dilution module in this utility model.

[0024] in:

[0025] 1. Particulate filter; 2. External circulation air pump; 3. Dilution module; 4. Sample gas inlet; 5. Diversion zone; 6. Diversion slit; 7. Outlet buffer zone; 8. Diversion outlet; 9. Dilution inlet; 10. Inlet buffer zone; 11. Dilution slit; 12. Dilution zone; 13. Sample gas outlet; 14. Second housing; 15. Second sampling tube; 16. Partition plate; 17. Sampling channel; 18. First sampling tube; 19. First housing. Detailed Implementation

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

[0027] like Figure 1 The device shown is a split-flow aerosol diluter, which includes a dilution module 3, a high-efficiency particulate filter 1, and an external circulation air pump 2.

[0028] like Figure 2As shown, the dilution module 3 includes a diversion component and a dilution component arranged sequentially; the diversion component includes a first housing 19 and a first sampling tube 18 embedded inside the first housing 19; the dilution component includes a second housing 14 and a second sampling tube 15 embedded inside the second housing 14; one end of the first housing 19 is provided with a sample gas inlet 4, and the other end is connected to one end of the second housing 14, and the other end of the second housing 14 is provided with a sample gas outlet 13; the area between the first housing 19 and the first sampling tube 18 is a diversion cavity; the area between the second housing 14 and the second sampling tube 15 is a dilution cavity; a diversion outlet 8 is opened on the outer wall of the end of the first housing 19 connected to the second housing 14; a dilution inlet 9 is opened on the outer wall of the end of the second housing 14 connected to the first housing 19; the inner cavity of the first sampling tube 18 is connected to the inner cavity of the second sampling tube 15, and the inner cavities of the two form a sampling channel 17.

[0029] According to a preferred embodiment of this invention, the diversion assembly and the dilution assembly are connected by a partition 16; the partition 16 is annular; the first housing 19, the second housing 14, the first sampling tube 18, and the second sampling tube 18 are all mounted on the partition 16 by welding. The first housing 19 and the second housing 14 are symmetrically arranged about the partition 16. The first sampling tube 18 and the second sampling tube 18 are symmetrically arranged about the partition 16.

[0030] According to a preferred embodiment of this invention, the diversion outlet 8 is connected to a particulate filter 1 via a pipeline, and the diversion outlet 8 is connected to the inlet of the particulate filter 1; the outlet of the particulate filter 1 is connected to the inlet of the external circulation air pump 2, and the outlet of the external circulation air pump 2 is connected to the dilution inlet 9. In this embodiment, the particulate filter 1 is a high-efficiency particulate filter. Since the high-efficiency particulate filter 1 is a consumable and needs to be replaced after prolonged use, making the particulate filter 1 external and independently replaceable greatly simplifies maintenance and reduces maintenance costs. Simultaneously, the addition of the external circulation air pump 2 effectively reduces the pipeline resistance of the diluent, significantly improving its adaptability and flexibility, enabling it to perform excellently in various application scenarios.

[0031] According to a preferred embodiment of the present invention, the first sampling tube 18 and the second sampling tube 15 are coaxially arranged, and their inner cavities are connected to form a sampling channel 17. The connection point between the first sampling tube 18 and the second sampling tube 15 is located on the inner side of the inner wall of the partition 16.

[0032] According to a preferred embodiment of the present invention, both the first housing 19 and the second housing 14 include a cylindrical housing portion one, a frustum-shaped housing portion two, and a cylindrical housing portion three arranged sequentially. The diversion outlet 8 is disposed on the housing portion three of the first housing 19. The dilution inlet 9 is disposed on the housing portion three of the second housing 14.

[0033] According to a preferred embodiment of the present invention, both the first sampling tube 18 and the second sampling tube 15 include a sampling section one, a sampling section two, and a sampling section three arranged sequentially; the outer wall of the sampling section one is a first inclined surface parallel to the inner wall of the housing section two; the outer walls of the sampling section two and the sampling section three are both circumferential surfaces parallel to the inner wall surface of the housing section three; the diameter of the outer wall of the sampling section two is larger than the diameter of the outer wall of the sampling section three, and the connection between the sampling section two and the sampling section three is a second inclined surface.

[0034] According to a preferred embodiment of the present invention, in the diversion assembly, an annular diversion slit 6 is formed in the region between the housing part two and the sampling part one. This slit ensures that during the diversion of the sample gas, only the airflow entering from the sample gas inlet near the pipe wall is drawn, and the sampling airflow in the middle can maintain a stable laminar flow state. This design avoids additional particulate matter loss caused by disturbances in the sampling airflow field.

[0035] According to a preferred embodiment of this invention, in the dilution assembly, the area enclosed by the housing portion three of the first housing 19, the second inclined surface of the first sampling tube 18, the sampling portion three of the first sampling tube 15, and the partition forms an outlet buffer zone 7. The outlet buffer zone 7 is designed to ensure a uniform distribution of airflow at the diversion slit, rather than simply drawing diverted gas from a single side of the diversion outlet. The fundamental purpose of this is to effectively avoid unnecessary interference with the sampling airflow.

[0036] According to a preferred embodiment of this invention, in the dilution assembly, the area enclosed by the housing portion three of the second housing 14, the second inclined surface of the second sampling tube 15, the sampling portion three of the second sampling tube 15, and the partition 16 forms an inlet buffer zone 10. The inlet buffer zone 10 is designed to ensure that the incoming dilution airflow can be uniformly drawn in from the dilution slit, thereby avoiding direct impact on the sampling airflow due to excessive pressure or flow rate during the airflow inflow process, effectively reducing the resulting particulate matter loss.

[0037] According to a preferred embodiment of this invention, in the dilution assembly, an annular dilution slit 11 is formed in the region between the housing portion of the second housing 14 and the first inclined surface of the second sampling tube 15. When the dilution gas flow merges with the sampling gas flow, the annular dilution slit 11 ensures that it tightly surrounds the sampling gas flow. The primary consideration of this design is to prevent disturbance to the flow field of the sampling gas flow, thereby maintaining its stability. Secondly, due to the outer layer of clean gas, the friction of the tube wall and the internal friction caused by fluid viscosity are effectively reduced, significantly reducing the negative impact of the wall effect on the sampling gas flow. Furthermore, after the dilution gas flow merges, the mixed gas flow can still maintain a laminar flow state, avoiding the acceleration of the gas velocity. This provides a strong guarantee for the realization of isokinetic sampling, ensuring that the collected sample gas is more representative and accurate.

[0038] According to a preferred embodiment of this invention, the dilution module 3 is symmetrically arranged, with the sample gas inlet 4, the sampling channel 17, and the sample gas outlet 13 all arranged coaxially. This design not only maintains the compactness of the structure but also gives it a high degree of balance. In particular, through the symmetrical structural design, the first and second shells, as well as the first and second sampling tubes, all achieve the reuse of structural components, greatly simplifying the production process and significantly reducing processing costs.

[0039] like Figure 1 and Figure 2 As shown, the working process of the diversion-type aerosol diluter device of this utility model is as follows:

[0040] S1. The sample gas to be diluted is introduced into the dilution module 3 through the sample gas inlet 4.

[0041] S2. When the sample gas flows through the splitting zone 5, it is split into two airflows: the outer splitting airflow and the inner sampling airflow. The splitting airflow is then guided into the splitting slit 6, while the sampling airflow smoothly enters the sampling channel 17.

[0042] S3. The sampling airflow continues to move forward in the sampling channel 17 until it reaches the dilution zone 12.

[0043] S4. Simultaneously, the split airflow passes evenly through the split slit 6, enters the outlet buffer zone 7, and connects to the particulate filter 1 through the split outlet 8. After being purified by the particulate filter 1, the clean gas is sent to the inlet of the external circulation pump 2, and then pumped from the outlet of the external circulation pump 2 to the dilution inlet 9, forming a highly efficient circulation system.

[0044] S5. After passing through the inlet buffer 10, the dilution airflow is uniformly guided to the dilution slit 11 and then passes through the slit into the dilution zone 12. Within the dilution zone 12, the dilution airflow tightly surrounds the sampling airflow, achieving effective mixing.

[0045] S6. The uniformly mixed diluted sample gas is discharged from the sample gas outlet 13 and sent to other related equipment for further measurement and analysis.

[0046] In summary, the diverter aerosol diluter device described in this invention features a compact structure, convenient operation, high adaptability, and easy maintenance. This device effectively overcomes the shortcomings of existing technologies, provides strong technical support for miniaturized and portable applications, and meets the market's urgent demand for products that combine high performance and lightweight design.

[0047] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A split-flow aerosol diluter device, characterized in that, The device includes a dilution module (3); the dilution module (3) includes a diversion component and a dilution component arranged sequentially; the diversion component includes a first housing (19) and a first sampling tube (18) embedded inside the first housing (19); the dilution component includes a second housing (14) and a second sampling tube (15) embedded inside the second housing (14); one end of the first housing (19) is provided with a sample gas inlet (4), and the other end is connected to one end of the second housing (14), and the other end of the second housing (14) is provided with a sample gas outlet (13). The area between the first housing (19) and the first sampling tube (18) is a diversion cavity; the area between the second housing (14) and the second sampling tube (15) is a dilution cavity; a diversion outlet (8) is provided on the outer wall of the end where the first housing (19) is connected to the second housing (14); a dilution inlet (9) is provided on the outer wall of the end where the second housing (14) is connected to the first housing (19); the inner cavity of the first sampling tube (18) is connected to the inner cavity of the second sampling tube (15), and the inner cavities of the two form a sampling channel (17).

2. The split-flow aerosol diluter device according to claim 1, characterized in that, The diversion component and the dilution component are connected by a partition (16); the partition (16) is annular; the first housing (19), the second housing (14), the first sampling tube (18) and the second sampling tube (15) are all installed on the partition (16) by welding; the first housing (19) and the second housing (14) are symmetrically arranged about the partition (16); the first sampling tube (18) and the second sampling tube (15) are symmetrically arranged about the partition (16).

3. The split-flow aerosol diluter device according to claim 1, characterized in that, The diversion outlet (8) is connected to a particulate filter (1) via a pipeline. The diversion outlet (8) is connected to the inlet of the particulate filter (1). The outlet of the particulate filter (1) is connected to the inlet of the external circulation air pump (2). The outlet of the external circulation air pump (2) is connected to the dilution inlet (9).

4. The split-flow aerosol diluter device according to claim 2, characterized in that, The first sampling tube (18) and the second sampling tube (15) are coaxially arranged, and their inner cavities are connected to form a sampling channel (17); the connection between the first sampling tube (18) and the second sampling tube (15) is located on the inner side of the inner wall of the partition.

5. The split-flow aerosol diluter device according to claim 2, characterized in that, The first housing (19) and the second housing (14) each include a cylindrical housing part one, a frustum-shaped housing part two and a cylindrical housing part three arranged in sequence; the diversion outlet (8) is provided on the housing part three of the first housing (19); the dilution inlet (9) is provided on the housing part three of the second housing (14).

6. The split-flow aerosol diluter device according to claim 5, characterized in that, The first sampling tube (18) and the second sampling tube (15) each include a sampling section one, a sampling section two, and a sampling section three arranged sequentially; the outer wall of the sampling section one is a first inclined surface parallel to the inner wall of the housing section two; the outer walls of the sampling section two and the sampling section three are both circumferential surfaces parallel to the inner wall surface of the housing section three; the diameter of the outer wall of the sampling section two is larger than the diameter of the outer wall of the sampling section three, and the connection between the sampling section two and the sampling section three is a second inclined surface.

7. The split-flow aerosol diluter device according to claim 1, characterized in that, An annular slit is formed in the area between the housing part 2 of the second housing (14) and the sampling part 1 of the second sampling tube (15).

8. The split-flow aerosol diluter device according to claim 6, characterized in that, The area enclosed by the shell portion three of the first housing (19), the second inclined surface of the first sampling tube (18), the sampling portion three of the first sampling tube (18), and the partition (16) forms an outlet buffer zone.

9. The split-flow aerosol diluter device according to claim 6, characterized in that, The area enclosed by the housing part three of the second housing (14), the second inclined surface of the second sampling tube (15), the sampling part three of the second sampling tube (15), and the partition (16) forms an entrance buffer zone.

10. The split-flow aerosol diluter device according to claim 1, characterized in that, An annular dilution slit is formed in the area between the housing portion of the second housing (14) and the first inclined surface of the second sampling tube (15).

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