Diluting system with turbulence mixing function

Abstract

The utility model discloses a dilution system with turbulence mixing, which relates to the technical field of dilution systems, and comprises a capturing mechanism, a sample filter and a mixing buffer chamber, at least two capturing bins are arranged in the capturing mechanism, and the capturing bins of the capturing mechanism are communicated with a mixture of samples to be detected; one end of the sample filter can be communicated with any one capturing bin, the other end of the sample filter is communicated with the mixing buffer cavity, the mixing buffer cavity can be communicated with any one capturing bin, the sample filter is used for filtering and intercepting a to-be-detected sample to obtain a diluent, and the mixing buffer cavity is used for containing a diluted to-be-detected mixture. A mixture to be detected can be a solid-liquid two-phase mixture and a gas-solid two-phase mixture, the problem of non-uniform mixing under a high dilution ratio is solved by arranging the mixing buffer cavity at the mixed gas outlet, wide-range accurate dilution is realized by virtue of the turntable and the closed-loop dilution gas regeneration system, and the reliability, the applicability and the economical efficiency of equipment are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of dilution systems, and in particular to a dilution system with turbulent mixing. Background Technology

[0002] In the fields of environmental and industrial monitoring, there is an urgent need for improved accuracy and range in aerosol particulate matter monitoring. With the rapid development of these fields, directly measuring high-concentration aerosol samples not only fails to yield accurate data but may also damage measuring equipment. Therefore, an efficient and accurate aerosol dilution device is needed to improve the accuracy and reliability of monitoring data. Such a device can meet the precise measurement needs of 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. However, traditional dilution techniques generally suffer from limitations such as fixed or narrow adjustment ranges for dilution ratios, susceptibility to clogging, and dependence on external gas sources.

[0003] Existing rotary disk dilution technology requires a reduction in disk rotation speed to achieve high dilution ratios. However, this directly leads to a decrease in the sampling frequency of the capture chamber, making it impossible to achieve sufficient instantaneous mixing of high-concentration samples with the dilution gas flow at low flow rates. This ultimately results in periodic fluctuations in the concentration of the mixed gas at the outlet, indicating poor uniformity. Therefore, there is an urgent need for a dilution system that enables thorough mixing of samples, achieving stable and continuous dilution. Utility Model Content

[0004] The purpose of this invention is to provide a dilution system with turbulent mixing to solve the problems existing in the prior art, so as to fully mix the captured sample and the diluted sample in the mixing buffer chamber and achieve stable and continuous dilution.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This invention provides a dilution system with turbulent mixing, including a capture mechanism, a sample filter, and a mixing buffer chamber. The capture mechanism includes a loading chamber, a turntable, a rotary drive mechanism, and a capture chamber. The turntable is disposed inside the loading chamber. The rotating shaft of the rotary drive mechanism passes through the bottom of the loading chamber and is connected to the center of the turntable. The rotary drive mechanism can drive the turntable to rotate. At least two capture chambers are disposed on the turntable. The inner surface of the loading chamber can fit against the upper and lower surfaces of the turntable. The capture chambers are connected to a mixture of the sample to be tested. One end of the sample filter can be connected to any one of the capture chambers, and the other end can be connected to the mixing buffer chamber. The mixing buffer chamber can be connected to any one of the capture chambers. The sample filter is used to filter and retain the sample to be tested to obtain a diluent. The mixing buffer chamber is used to contain the diluted sample mixture.

[0007] Preferably, the upper part of the capture chamber is connected to the mixture via an inlet connector, and the lower part is connected to the sample filter via an outlet connector. The inlet connector is provided above the loading chamber, and the outlet connector is provided below the loading chamber.

[0008] Preferably, a plurality of capture chambers are evenly distributed along the circumference of the turntable, and the capture chambers are round holes, rectangular holes, prism holes or elliptical holes.

[0009] Preferably, the thickness of the turntable is at least 5 mm, and the volume of the capture chamber is at least 0.09 cm³. 3 .

[0010] Preferably, the loading chamber includes a loading cylinder, a cover plate, a support plate, a base, and an elastic support assembly. The top of the loading cylinder is sealed to the cover plate, the bottom is sealed to the base, and the middle is fitted with the support plate. The elastic support assembly is disposed between the support plate and the base. The turntable is located between the cover plate and the support plate, and the capture chamber can be closed by the cover plate and the support plate.

[0011] Preferably, the turntable is movably inserted into the rotating shaft of the rotary drive mechanism, the shaft gap passes through the central hole of the support plate, the elastic support assembly enables the upper surface of the turntable to fit against the cover plate and the lower surface to fit against the support plate, the cover plate is provided with a sample inlet, the sample inlet is threadedly connected to the sample inlet connector, the support plate is provided with a flow passage hole, the sample inlet and the flow passage hole are both corresponding to and connected to the position of the capture chamber, a guide tube is vertically slidably arranged in the flow passage hole, the lower end of the guide tube passes through and is fixedly connected to the base; the sample outlet connector is threadedly connected to the base.

[0012] Preferably, the support assembly includes a spring and the guide tube, with the spring sleeved on the guide tube and the spring in a compressed state; a differential pressure sensor is provided in the loading chamber, and the differential pressure sensor is used to detect the pressure difference between the loading chamber and the injection port.

[0013] Preferably, at least two guide tubes are provided, one of which is an outflow tube and the rest are return tubes. The outflow tube and each of the return tubes are fixedly connected to the base. The return connector is threaded to the base. The cover plate is provided with a sample outlet. Each return tube corresponds to a return connector and a sample outlet. Each sample outlet is sealed with a mixing buffer chamber. The inlet and outlet diameters of the mixing buffer chambers are smaller than the diameter of the middle chamber. The flow hole is a stepped hole. The upper end of the stepped hole is a waist-shaped groove and the lower end is a round hole. The guide tube is slidably inserted into the round hole. The length of the waist-shaped groove is at least the distance between two capture chambers plus the size of one capture chamber.

[0014] Preferably, the sample filter is connected to the sample outlet connector and the return connector via pipelines, and a throttling valve and a flow meter are installed on the pipeline between the sample filter and the return connector.

[0015] Preferably, the rotary drive mechanism includes a motor and a rotating shaft. The motor is connected to the rotating shaft. The lower end of the rotating shaft passes through the base and is clearance-fitted with the base. The upper end is a square shaft that passes through and inserts into the turntable. The base is fixedly connected to the housing of the motor.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] This invention solves the problem of uneven mixing at high dilution ratios by setting a mixing buffer chamber at the outlet of the mixed gas, and achieves wide-range precise dilution through a rotary table and a closed-loop dilution gas regeneration system, significantly improving the reliability, applicability and economy of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the dilution system with turbulent mixing in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the dilution system with turbulent mixing in an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the turntable connection structure of the dilution system with turbulent mixing in an embodiment of this utility model;

[0022] Figure 4 This is a schematic diagram of the support plate in an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the turntable structure in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram illustrating the operating principle of the capture chamber in this embodiment of the present invention;

[0025] In the diagram: 1-Sample inlet connector, 2-Loading chamber, 3-Mixing buffer chamber, 4-Sample filter, 5-Loading cylinder, 6-Cover plate, 7-Rotating disk, 8-Capture chamber, 9-Support plate, 10-Base, 11-Sample outlet connector, 12-Flow hole, 13-Guide tube, 14-Spring, 15-Motor, 16-Shaft, 17-Outlet tube, 18-Return tube, 19-Return connector, 20-Flow meter, 21-Throttle valve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "clockwise," and "counterclockwise," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the mechanism or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" 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, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The purpose of this invention is to provide a dilution system with turbulent mixing to solve the problems existing in the prior art, so as to fully mix the captured sample and the diluted sample in the mixing buffer chamber and achieve stable and continuous dilution.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figures 1 to 6 As shown, this embodiment provides a dilution system with turbulent mixing, including a capture mechanism, a sample filter 4, and a mixing buffer chamber 3. The capture mechanism includes a loading chamber 2, a turntable 7, a rotary drive mechanism, and a capture chamber 8. The turntable 7 is disposed inside the loading chamber 2. The rotating shaft 16 of the rotary drive mechanism passes through the bottom of the loading chamber 2 and is connected to the center of the turntable 7. The rotary drive mechanism can drive the turntable 7 to rotate. At least two capture chambers 8 are disposed on the turntable 7. The inner surface of the loading chamber 2 can fit against the upper and lower surfaces of the turntable 7. The capture chamber 8 is connected to a mixture of the sample to be tested. One end of the sample filter 4 can be connected to any one of the capture chambers 8, and the other end can be connected to the mixing buffer chamber 3. The mixing buffer chamber 3 can be connected to any one of the capture chambers 8. The sample filter 4 is used to filter and retain the sample to be tested to obtain a diluent. The mixing buffer chamber 3 is used to contain the diluted mixture of the sample to be tested. In this embodiment, the mixture of the sample to be tested can be a solid-liquid two-phase or a gas-solid two-phase. In this embodiment, the aerosol sample gas of the gas-solid two-phase is the main component. The rotation speed of the turntable 7 can be adjusted according to the dilution ratio requirements, which will not reduce the sampling frequency of the capture chamber while ensuring that the sample is fully mixed. The capture chamber 8 can also be combined with the diluent in a tube outside the capture mechanism and then jointly introduced into the mixing buffer chamber 3 for mixing, further realizing the mixing of the sample and improving the uniformity of the sample mixing.

[0033] As an alternative, in this embodiment, the upper part of the capture chamber 8 can be connected to the mixture through the sample inlet connector 1, and the lower part can be connected to the sample filter 4 through the sample outlet connector 11. The upper part of the loading chamber 2 is provided with the sample inlet connector 1, and the lower part is provided with the sample outlet connector 11.

[0034] As an optional solution, in this embodiment, a number of capture chambers 8 are evenly distributed along the circumference of the turntable 7. The capture chambers 8 are round holes, rectangular holes, prism holes or elliptical holes.

[0035] As an optional solution, in this embodiment, the thickness of the turntable 7 is at least 5 mm, and the volume of the capture chamber 8 is at least 0.09 cm³. 3 This embodiment achieves coarse adjustment of the dilution ratio by replacing the turntable 7 with different volume capture chambers 8; simultaneously, the dilution ratio is continuously fine-tuned by precisely controlling the rotation speed of the turntable 7 with a stepper motor 15. This combination of mechanical adjustment and dynamic control ensures that the dilution ratio can be precisely controlled and flexibly switched over a very wide range. The specific dilution ratio calculation is as follows:

[0036] The rotational speed of turntable 7 is n (r / s), and the conveying volume per revolution of turntable 7 is Vd = the number of capture chambers. The total volumetric flow rate Qv is the product of the volume of a single capture chamber, the rotational speed, and the dilution ratio (DR).

[0037]

[0038] If the dilution gas volumetric flow rate is Qx, then:

[0039] ;

[0040] Therefore, the dilution ratio DR can be expressed as:

[0041] ;

[0042] Taking a diluent flow rate of 2 L / min, a single capture chamber volume of 0.09 mL, 18 capture chambers, and a rotary table rotation speed of 100 r / min as an example, the specific dilution ratio (DR) is calculated as follows:

[0043] Dilution gas volumetric flow rate Qx:

[0044] ;

[0045] The volume Vd conveyed per revolution of turntable 7:

[0046] ;

[0047] Rotational speed n of turntable 7:

[0048] ;

[0049] If the rotation speed of turntable 7 is too low to achieve sufficient instantaneous mixing at low flow rates, the speed can be adjusted according to the actual situation.

[0050] Substituting into the dilution ratio calculation formula, we get:

[0051] Therefore, the dilution ratio under the above conditions is approximately 13.35.

[0052] As an optional solution, in this embodiment, the loading cavity 2 includes a loading cylinder 5, a cover plate 6, a support plate 9, a base 10, and an elastic support assembly. The top of the loading cylinder 5 is sealed with the cover plate 6, the bottom is sealed with the base 10, and the middle is fitted with the support plate 9. An elastic support assembly is provided between the support plate 9 and the base 10. The turntable 7 is located between the cover plate 6 and the support plate 9, and the capture chamber 8 can be closed by the cover plate 6 and the support plate 9, thereby sealing the upper and lower surfaces of the capture chamber 8.

[0053] As an optional solution, in this embodiment, the turntable 7 is movably inserted into the rotating shaft 16 of the rotary drive mechanism. The rotating shaft 16 passes through the central hole of the support plate 9. The elastic support assembly enables the upper surface of the turntable 7 to fit against the cover plate 6 and the lower surface to fit against the support plate 9. The cover plate 6 is provided with a sample inlet, which is connected to a sample inlet connector 1 via a thread. The support plate 9 is provided with a flow passage 12. The sample inlet and the flow passage 12 are both corresponding to and connected to the position of the capture chamber 8. A guide tube 13 is vertically slidably arranged in the flow passage 12. The lower end of the guide tube 13 passes through and is fixedly connected to the base 10. A sample outlet connector 11 is threadedly connected to the base 10. The sample inlet is connected to the air inlet channel for introducing high-pressure, high-concentration sample gas. After the capture chamber 8 intercepts the sample gas, it discharges the high-concentration sample gas captured in the capture chamber 8 through the flow passage 12 and the sample outlet. After quantitative sampling, the capture chamber 8 transports the sample to be tested to the dilution end for dilution by rotation.

[0054] As an optional solution, the neutral support component in this embodiment includes a spring 14 and a guide tube 13. The guide tube 13 is fitted with a spring 14. The spring 14 is in a compressed state to ensure that the support plate 9, the cover plate 6 and the turntable 7 are always subjected to elastic force to keep them in contact with the turntable 7, thereby achieving the rotational sealing of the capture chamber 8.

[0055] As an optional solution, a differential pressure sensor is installed in the loading chamber 2 in this embodiment. The differential pressure sensor is used to detect the pressure difference between the loading chamber 2 and the inlet. By adjusting the pressure inside the loading chamber 2, the pressure difference between the two can be made closer, thereby ensuring the sealing between the turntable 7 and the support plate 9. Specifically, the differential pressure sensor measures the pressure difference between the loading chamber 2 and the inlet, with one end measuring the pressure at the inlet and the other end extending into the loading chamber 2 to measure the pressure inside the loading chamber 2. The key to the dilution principle in this embodiment lies in the sealing between the capture chamber 8 and the guide tube 13 and the loading chamber 2. It is essential to ensure that the contact surfaces between the turntable 7 and the cover plate 6 and the support plate 9 are as flat and smooth as possible. Experiments show that the dilution system with turbulent mixing in this embodiment can maintain the relative sealing of the capture chamber 8 when the pressure difference between the sample gas and the loading chamber 2 is less than 50 mbar.

[0056] As an optional solution, in this embodiment, at least two guide tubes 13 are provided, one of which is an outflow tube 17, and the rest are return tubes 18. The outflow tube 17 and each return tube 18 are fixedly connected to the base 10. The return connector 19 is threadedly connected to the base 10. The cover plate 6 is provided with a sample outlet. Each return tube 18 corresponds to a return connector 19 and a sample outlet. The sample outlet discharges the finally diluted mixed gas. A mixing buffer chamber 3 is sealed and connected to each sample outlet. The inlet and outlet diameters of the mixing buffer chambers are smaller than the diameter of the middle chamber, further forming turbulent mixing. In this embodiment, there are two guide tubes 13, one outflow tube 17 and one return tube 18. The mixing buffer chamber 3 can fully mix the diluted gas and the sample gas to be tested again. Its volume is about 2.3 mL and its material is stainless steel 304. This embodiment incorporates a mixing buffer chamber 3 with a sudden expansion structure at the outlet of the mixed gas. This allows particles and filtered dilution gas to enter the structure, suddenly increasing the flow area and creating a negative pressure at the center, thus forming a backflow. This ensures uniform mixing of the test gas and the dilution gas, effectively solving the problem of uneven mixing of the test gas pulse and the dilution gas caused by the slow rotation speed of the turntable 7 under high dilution ratio conditions. The mixing buffer chamber 3 allows the discontinuous test gas and dilution gas to diffuse and homogenize fully, ultimately outputting a mixed gas with extremely stable and uniform concentration, ensuring measurement accuracy and reliability across the entire dilution ratio range.

[0057] As an optional solution, in this embodiment, the flow hole 12 is a stepped hole, with an upper end of a waist-shaped groove and a lower end of a round hole. The guide tube 13 is slidably inserted into the round hole. The length of the waist-shaped groove is at least the distance between two capture chambers 8 plus the size of one capture chamber 8, ensuring that the waist-shaped groove always maintains a communication relationship with the capture chamber 8 during rotation. Similarly, the sample inlet on the cover plate 6 also includes threaded holes and waist-shaped grooves for connection from top to bottom.

[0058] As an optional solution, in this embodiment, the sample filter 4 is connected to the sample outlet connector 11 and the return connector 19 via pipelines. A throttling valve 21 and a flow meter 20 are installed on the pipeline between the sample filter 4 and the return connector 19. The sample filter 4 can be a capsule filter, containing a hydrophobic polytetrafluoroethylene (PTFE) membrane with a pore size of 0.2 μm, which can filter aerosol particles in the sample gas to generate clean dilution gas. The throttling valve 21 is used to regulate the dilution gas flow rate, and the flow meter 20 is used to monitor and provide feedback on the dilution gas flow rate in real time. This embodiment, through the built-in sample filter 4, purifies the high-concentration waste gas remaining after sample collection, removing particulate matter and converting it into clean dilution gas for recirculation within the system. This closed-loop design eliminates the need for an external pure gas source, achieving self-sufficiency in dilution gas and significantly reducing operating costs and system complexity.

[0059] As an optional solution, the rotary drive mechanism in this embodiment includes a motor 15 and a rotating shaft 16. The motor 15 is preferably a stepper motor. The motor 15 is connected to the rotating shaft 16. The lower end of the rotating shaft 16 passes through the base 10 and is clearance-fitted with the base 10. The upper end is a square shaft that passes through and inserts into the turntable 7, ensuring that the turntable 7 can slide up and down and rotate with the rotating shaft 16. The base 10 is fixedly connected to the housing of the motor 15. In this embodiment, torque is transmitted through the rotating shaft 16 to drive the turntable 7 carrying the capture chamber 8 to rotate. A Hall effect speed sensor is connected to the motor 15 to measure the rotational speed of the rotating shaft 16. The motor 15 ensures that the turntable 7 rotates at a constant and controllable speed.

[0060] As an alternative, in this embodiment, the throttle valve 21 is preferably an electric valve. The motor 15, the throttle valve 21, the flow meter 20, and the Hall speed sensor can all be connected to a control unit, which can adjust the speed of the motor 15 and the flow rate of the return flow.

[0061] Example 2

[0062] like Figures 1 to 6 As shown, this embodiment provides the working principle and usage steps of a dilution system with turbulent mixing. The sample to be tested is an aerosol sample gas, as shown in the following details:

[0063] During operation, the capture chamber 8 rotates to below the inlet to capture a quantitative sample gas, and then rotates to the return pipe 18 to mix with the dilution gas and flow out. The captured sample gas and the dilution gas flow into the mixing buffer chamber 3 for thorough mixing, achieving stable and continuous dilution and overcoming the problem of uneven mixing of particles and filtered clean gas when the rotation speed is low.

[0064] Step 1: Based on the target dilution ratio, select a turntable 7 with a specific number of capture chambers 8 and install it on the shaft 16 of the motor 15 inside the diluter. Assemble the equipment and set the rotation speed of the motor 15. The dilution ratio is determined by the number of capture chambers 8 (each capture chamber 8 captures a fixed volume of sample gas as it passes through; therefore, the more capture chambers 8 there are, the more sample is captured, and the smaller the dilution ratio), the dilution gas flow rate (the total volume of the final mixed gas is determined by the mixing of pure dilution gas and the sampled gas; the higher the dilution gas flow rate, the lower the concentration of the mixed sample gas, and the larger the dilution ratio), and the rotation speed of the turntable 7 (the rotation speed determines the sampling frequency per unit time; the faster the rotation speed, the more sample gas passes through and is filled in the capture chambers 8 per unit time, i.e., the higher the sampling rate, and the smaller the dilution ratio). The dilution ratio can be adjusted by adjusting the rotation speed, replacing the turntable 7, or changing the dilution gas flow rate. The tightness between the turntable 7 and the support plate 9 is affected by sealing performance and frictional loss, and these two factors are contradictory. If the gap between the turntable 7 and the support plate 9 is too loose, particles will leak; if it is too tight, friction will be severe, generating new particles and causing the turntable 7 to overheat. To solve this problem, a spring 14 is used to properly press the turntable 7 against the support plate 9 and the cover plate 6 to avoid excessive friction. At the same time, a vacuum pump can be connected to evacuate the loading chamber 2. During the process, a differential pressure sensor is used to monitor the pressure difference between the loading chamber 2 and the sample gas, ensuring that the vacuum level is within 50 mbar of the sample gas, thereby solving the problem of easy leakage between the turntable 7 and the support plate 9.

[0065] Step 2: Connect the high-concentration sample gas source to the inlet, with the airflow direction directly facing the capture chamber 8 on the turntable 7. As the motor 15 drives the turntable 7 to rotate at a constant speed, when a capture chamber 8 on the turntable 7 rotates past the inlet, it will be filled with sample gas in a very short time. Since the volume of the capture chamber 8 is fixed (the volume of a single capture chamber 8 is approximately 0.09 cm³), the sample gas will be used to fill the chamber. 3 The number of capture chambers 8 is 18, so each time the sample passes through the inlet, a high-concentration sample gas of precise and fixed volume is captured. During the process, a Hall effect speed sensor (set on the side of the rotating shaft 16 to measure the rotation speed of the shaft 16) is used to monitor the actual rotation speed of the turntable 7 in real time.

[0066] Step 3: The sample gas captured by the capture chamber 8 flows into the sample filter 4 under the impact of the inlet air pressure, filtering out the particles in the sample gas and converting it into dilution gas. After the flow rate is monitored by the flow meter 20, it is introduced into the return pipe 18. When the capture chamber 8 carrying the sample gas rotates to the top of the return pipe 18 and is connected, the sample gas is carried out from the capture chamber 8 by the dilution gas and enters the mixing buffer chamber 3 for thorough mixing.

[0067] Step 4: A vortex fan is installed to dissipate heat from the friction between the turntable 7 and the support plate 9. Simultaneously, a temperature sensor is used to monitor the temperature of the friction components in real time, ensuring it does not exceed 70°C to prevent the formation of new particles due to excessive localized overheating and the thermal loss of existing particles. A turbine fan is preferably used as the vortex fan, positioned above and to the right of the dilution system with turbulent mixing, blowing onto the upper end of the cover plate 6 and the outer surface of the loading chamber 2. For rapid heat dissipation and wear resistance, the cover plate 6 is made of 304 stainless steel, while the turntable 7 is made of a high-temperature resistant and wear-resistant material composed of polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), and carbon fiber.

[0068] Step 5: The flow rate of the gas-solid mixture is controlled by a flow meter 20 and a throttle valve 21 to obtain a sample gas with a stable flow rate and a set dilution ratio. Since the particles are intermittently transported from the inlet to the outlet of the rotary disc 7, the distance between each transported particle is relatively large under low-speed conditions, resulting in uneven particle distribution. A mixing buffer chamber 3 is set at the outlet. The mixing buffer chamber 3 adopts a sudden expansion structure design with inlet and outlet diameters smaller than the central chamber size. This allows the particles and filtered clean gas to enter the structure, suddenly increasing the flow area and creating a negative pressure in the center, thus forming a backflow and uniformly mixing the particles and clean gas.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A dilution system with turbulent mixing, characterized by: The device includes a capture mechanism, a sample filter, and a mixing buffer chamber. The capture mechanism includes a loading chamber, a turntable, a rotary drive mechanism, and a capture chamber. The turntable is disposed inside the loading chamber. The rotating shaft of the rotary drive mechanism passes through the bottom of the loading chamber and is connected to the center of the turntable. The rotary drive mechanism can drive the turntable to rotate. At least two capture chambers are disposed on the turntable. The inner surface of the loading chamber can fit against the upper and lower surfaces of the turntable. The capture chambers are connected to a mixture of the sample to be tested. One end of the sample filter can be connected to any one of the capture chambers, and the other end can be connected to the mixing buffer chamber. The mixing buffer chamber can be connected to any one of the capture chambers. The sample filter is used to filter and retain the sample to be tested to obtain a diluent. The mixing buffer chamber is used to contain the diluted sample mixture.

2. The dilution system with turbulent mixing of claim 1, wherein: The upper part of the capture chamber is connected to the mixture via an inlet connector, and the lower part is connected to the sample filter via an outlet connector. The upper part of the loading chamber is provided with the inlet connector, and the lower part is provided with the outlet connector.

3. The dilution system with turbulent mixing of claim 1, wherein: The turntable has a number of capture chambers evenly distributed along its circumference. The capture chambers are round holes, rectangular holes, prism holes or elliptical holes.

4. The dilution system with turbulent mixing of claim 1, wherein: The thickness of the turntable is at least 5 mm, and the volume of the capture chamber is at least 0.09 cm³. 3 .

5. The dilution system with turbulent mixing of claim 2, wherein: The loading chamber includes a loading cylinder, a cover plate, a support plate, a base, and an elastic support assembly. The top of the loading cylinder is sealed to the cover plate, the bottom is sealed to the base, and the middle is fitted with the support plate. The elastic support assembly is disposed between the support plate and the base. The turntable is located between the cover plate and the support plate, and the capture chamber can be closed by the cover plate and the support plate.

6. The dilution system with turbulent mixing of claim 5, wherein: The turntable is movably inserted into the rotating shaft of the rotary drive mechanism. The shaft gap passes through the central hole of the support plate. The elastic support assembly enables the upper surface of the turntable to fit against the cover plate and the lower surface to fit against the support plate. The cover plate is provided with a sample inlet, which is threadedly connected to the sample inlet connector. The support plate is provided with a flow passage hole. The sample inlet and the flow passage hole correspond to and communicate with the position of the capture chamber. A guide tube is vertically slidably arranged in the flow passage hole, and the lower end of the guide tube passes through and is fixedly connected to the base. The sample outlet connector is threadedly connected to the base.

7. The dilution system with turbulent mixing of claim 6, wherein: The support assembly includes a spring and a flow guide tube, with the spring sleeved on the flow guide tube and the spring in a compressed state; a differential pressure sensor is provided in the loading chamber, and the differential pressure sensor is used to detect the pressure difference between the loading chamber and the injection port.

8. The dilution system with turbulent mixing according to claim 7, characterized in that: At least two guide tubes are provided, one of which is an outflow tube and the rest are return tubes. The outflow tube and each of the return tubes are fixedly connected to the base. The return connector is threaded to the base. The cover plate is provided with a sample outlet. Each return tube corresponds to a return connector and a sample outlet. Each sample outlet is sealed with a mixing buffer chamber. The inlet and outlet diameters of the mixing buffer chambers are smaller than the diameter of the middle chamber. The flow hole is a stepped hole with an upper waist-shaped groove and a lower circular hole. The guide tube is slidably inserted into the circular hole. The length of the waist-shaped groove is at least the distance between two capture chambers plus the size of one capture chamber.

9. The dilution system with turbulent mixing of claim 8, wherein: The sample filter is connected to the sample outlet and the return connector via pipelines, and a throttling valve and a flow meter are installed on the pipeline between the sample filter and the return connector.

10. The dilution system with turbulent mixing of claim 5, wherein: The rotary drive mechanism includes a motor and a rotating shaft. The motor is connected to the rotating shaft. The lower end of the rotating shaft passes through the base and is clearance-fitted with the base. The upper end is a square shaft that passes through and inserts into the turntable. The base is fixedly connected to the housing of the motor.

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