Multi-cyclone nanoparticle grader and nanoparticle preparation system
The multi-stage separation and nanofilter of the multi-cyclone nanoparticle classifier solve the problems of time-consuming and low efficiency of nanoparticle separation, and achieve fast and efficient nanoparticle separation and collection.
Patent Information
- Application Number
- CN202521496253.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2035-07-17
AI Technical Summary
Existing nanoparticle separation devices are time-consuming and inefficient, and it is difficult to efficiently separate nanoparticles with particle sizes that meet the requirements.
A multi-cyclone nanoparticle classifier is used, including a stirring tank, a conveying component, a primary separator and a secondary separator. Nanoparticles with particle sizes that meet the requirements are quickly separated and collected through multi-stage separation and nanofilters.
The rapid separation and efficient collection of nanoparticles are achieved, the separation efficiency is improved, the separation time is reduced, and the collection rate of nanoparticles is increased.
Smart Images
Figure CN223405141U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of particle classification equipment, and specifically relates to a multi-cyclone nanoparticle classifier and a nanoparticle preparation system. Background Art
[0002] In recent years, the development of industrial technology has led to the demand for new materials that meet the requirements of fine components and the machines they are used in. Compared to existing micron-sized powder materials, research related to the synthesis and application of nano-sized powder materials has also attracted much attention. Generally speaking, mechanical pulverization is limited in the production of powders with particle sizes below 100nm. To produce powders with particle sizes of tens of nanometers, plasma-assisted micro-nano powder preparation technology is often used.
[0003] Flame and electric explosion methods are widely used to prepare micro- and nano-powder materials requiring high purity and high yield. However, the powders produced using these methods often have varying particle sizes, ranging from a few nanometers to several microns, making them unsuitable for direct application. Nanoparticles that meet the requirements must be isolated.
[0004] Conventional devices for separating nanoparticles typically stir a fluid containing nanoparticles, causing the particles to settle in order of size, with the largest particles sinking to the bottom and the size of particles decreasing as they settle upwards. However, the small size of nanoparticles means that settling takes a long time, often requiring more than 10 months, making it inefficient. Utility Model Content
[0005] The technical problem to be solved by this application is that the existing nanoparticle separation is time-consuming and inefficient. In order to solve this technical problem, a multi-cyclone nanoparticle classifier and a nanoparticle preparation system are provided that can separate nanoparticles in a short time.
[0006] The technical solutions proposed in this application are:
[0007] A multi-cyclone nanoparticle classifier, comprising:
[0008] A stirring tank for stirring particles;
[0009] a conveying assembly connected to the stirring tank;
[0010] A primary separator and a secondary separator, wherein the input port of the primary separator is connected to the conveying assembly, the first outlet of the primary separator and the third outlet of the secondary separator are both connected to the stirring tank to convey particles with larger particle sizes to the stirring tank, and the second outlet of the primary separator is connected to the input port of the secondary separator to input particles with smaller particle sizes into the secondary separator;
[0011] The collecting assembly is communicated with the fourth outlet of the secondary separator so that the secondary separator can transport particles with smaller particle sizes to the collecting assembly.
[0012] Adopt above-mentioned multi-cyclone nanoparticle classifier, stirred tank stirs particles to suspended state, conveying mechanism conveys the particles in stirred tank and passes through the separation of primary separator and secondary separator successively, and the nanoparticles with small particle size separated are transported to collecting assembly for collection, while the particles with larger particle size are transported back to stirred tank and continue to stir. Through the multi-stage separation of primary separator and secondary separator, the nanoparticles with the particle size meeting the requirements are separated to collecting assembly for collection, which consumes less time and is more efficient. Simultaneously, the particles with larger particle size are discharged to stirred tank, and the particles circulate between stirred tank and separator, thereby the nanoparticles with the particle size meeting the requirements are transported to collecting assembly as much as possible, thereby improving the collection rate of nanoparticles.
[0013] Furthermore, the multi-cyclone nanoparticle classifier further includes a nanofilter, and the nanofilter is arranged at the fourth outlet of the secondary separator.
[0014] Furthermore, the collecting assembly includes a main drain pipe and a collecting box, one end of the main drain pipe is connected to the fourth outlet of the secondary separator, and a discharge hole is opened on the side wall of the main drain pipe, and the collecting box is connected to the discharge hole.
[0015] Furthermore, the main pipe extends in a vertical direction, and the bottom end of the main pipe is connected to the fourth outlet of the secondary separator;
[0016] There are multiple discharge holes and multiple collecting boxes, and the multiple discharge holes are arranged at intervals along the vertical direction. Each collecting box is connected to a corresponding discharge hole.
[0017] Furthermore, the collecting assembly also includes a collecting filter, the collecting box is provided with an air inlet and an air outlet, the air inlet is communicated with the discharge hole, and the collecting filter is arranged at the air outlet.
[0018] Furthermore, the first-stage separator includes a columnar portion and a conical portion sequentially arranged and connected in a vertical direction, and the radial dimension of the conical portion gradually decreases from top to bottom;
[0019] The input port of the primary separator is located on the side wall of the columnar portion, the second outlet of the primary separator is located on the top of the columnar portion, and the first outlet of the primary separator is located at the bottom of the conical portion.
[0020] Furthermore, the first-stage separator also includes an air inlet pipe, the conveying assembly is connected to the air inlet pipe, the air inlet pipe is connected to the outer side of the columnar portion, and is communicated with the input port of the first-stage separator, and the input direction of the air inlet pipe is set at an angle to the radial direction of the columnar portion.
[0021] Furthermore, the structure of the secondary separator is the same as that of the primary separator.
[0022] A nanoparticle preparation system comprises the multi-cyclone nanoparticle classifier as described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application.
[0024] Figure 1 A schematic structural diagram of a multi-cyclone nanoparticle classifier provided in one embodiment of the present application;
[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the first-stage separator in the multi-cyclone nanoparticle classifier shown.
[0026] Description of labels:
[0027] 110. Tank body; 120. Agitator; 111. Delivery pipeline; 130. Delivery pump; 140. Primary separator; 141. First outlet; 142. Air inlet pipe; 143. Second outlet; 150. Secondary separator; 151. Third outlet; 152. Nanofilter; 153. Main exhaust pipe; 154. Collection box. DETAILED DESCRIPTION
[0028] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.
[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[0031] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0032] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.
[0034] On the one hand, the present application provides a multi-cyclone nanoparticle classifier that can separate nano-scale particles in a short time and with high efficiency.
[0035] like Figure 1 and Figure 2 As shown, in one embodiment, the multi-cyclone nanoparticle classifier includes a stirring tank, a conveying assembly, a primary separator 140, a secondary separator 150, and a collecting assembly.
[0036] The stirring tank is used to stir particles, that is, to stir particles of different sizes so that the particles are in a suspended state. The conveying assembly is connected to the stirring tank and the input port of the first-stage separator 140 to input the particles in the stirring tank into the first-stage separator 140. The first outlet 141 of the first-stage separator 140 is connected to the stirring tank to convey particles with larger particle sizes to the stirring tank, and the second outlet 143 of the first-stage separator 140 is connected to the input port of the second-stage separator 150 to convey particles with smaller particle sizes to the second-stage separator 150; the third outlet 151 of the second-stage separator 150 is connected to the stirring tank to convey particles with larger particle sizes to the stirring tank, and the fourth outlet of the second-stage separator 150 is connected to the collecting assembly to convey particles with smaller particle sizes to the collecting assembly.
[0037] When separating nanoparticles, the stirring tank stirs particles of different sizes to keep them in a suspended state. The conveying assembly then transports the particles from the stirring tank to the primary separator 140, where they undergo preliminary separation. Particles with larger sizes are discharged from the first outlet 141 into the stirring tank, while particles with smaller sizes are discharged from the second outlet 143 into the secondary separator 150. Within the secondary separator 150, the particles are separated again, with particles with larger sizes discharged from the third outlet 151 into the stirring tank, and particles with smaller sizes are discharged from the fourth outlet into the collection assembly. Thus, when applied to the separation of nanoparticles, the particles first undergo preliminary separation in the primary separator 140, and particles with smaller sizes enter the secondary separator 150 for secondary separation, i.e., nanoparticles with a size smaller than a preset size are separated and collected in the collection assembly.
[0038] It should be noted that the above-mentioned particles with larger particle sizes and particles with smaller particle sizes are only used to reflect the difference in particle size between the two, and the specific size can be determined according to actual conditions. For example, the particles in the stirring tank are all nanoparticles, but include particles of tens of nanometers and hundreds of nanometers, and the collection component is used to collect particles of tens of nanometers. The first-stage separation component can separate most of the particles of tens of nanometers, but some of them will contain particles of hundreds of nanometers; and the second-stage separator 150 further separates these particles, so that most of the particles of tens of nanometers are transported to the collection component through the fourth outlet of the second-stage separator 150, and the particles of hundreds of nanometers can be discharged to the stirring tank through the third outlet 151.
[0039] Adopt above-mentioned multi-cyclone nano particle classifier, stirred tank stirs particle to suspended state, conveying mechanism carries the particle in the stirred tank through the separation of primary separator 140 and secondary separator 150 successively, and the little nanoparticle of isolated particle diameter is transported to collecting assembly and is collected, and the larger particle of particle diameter is then transported back to stirred tank and continues to stir.Through the multi-stage separation of primary separator 140 and secondary separator 150, realization is separated into collecting assembly and is collected with the satisfactory nanoparticle of particle diameter, consuming time shorter, and efficiency is higher.Simultaneously, the larger particle of particle diameter is discharged into stirred tank, and particle circulates between stirred tank and separator, thereby as far as possible the satisfactory nanoparticle of particle diameter is transported to collecting assembly, improves the collection rate of nanoparticle.
[0040] It should be noted that, in the present application, particles are separated in the primary separator 140 and the secondary separator 150. Compared to the existing sedimentation method, the separation efficiency is bound to be higher, and the nanoparticles with the required particle size are directly collected by the collection assembly after separation, thereby improving the separation efficiency. In addition, the particles in the above-mentioned stirred tank are all nanoparticles. For example, the particle size of the nanoparticles in the stirred tank ranges from tens of nanometers to hundreds of nanometers. The particles separated by the primary separator may be particles with a particle size of less than 100 nm, and the particles separated by the secondary separator may be particles with a particle size of less than 50 nm. Of course, this can be used as an example, and the specific separation effect can be determined according to the actual situation, which is not limited here.
[0041] It should be further explained that the particle separation operation within the primary separator 140 and the secondary separator 150 means that after the fluid enters the separator, small particles with a particle size that meets the requirements will be separated from the fluid and enter the next-stage separator 140 or the collection component. However, not all small particles with a particle size that meets the requirements are separated at once; some small particles will be discharged with the fluid. Therefore, the stirring tank and conveying component are provided to allow the particles to circulate between the stirring tank and the separator, and to discharge as many small particles that meet the requirements as possible through the separator to the collection component.
[0042] In other embodiments, more stages of separators may be provided, for example, an intermediate stage separator may be provided between the primary separator 140 and the secondary separator 150 , so as to further improve the separation effect and ensure that particles meeting the particle size requirements are separated.
[0043] In one embodiment, the multi-cyclone nanoparticle classifier further includes a nanofilter 152, which is disposed at the fourth outlet of the secondary separator 150 to filter out particles whose particle size does not meet the requirements, thereby ensuring that the particles output from the secondary filter to the collection assembly are particles with a particle size that meets the requirements, such as the aforementioned particles with a particle size of less than 50 nm. In this case, the pore size of the filter pores of the nanofilter 152 can be 50 nm.
[0044] In one embodiment, the stirring tank includes a tank body 110 and an agitator 120. The tank body 110 is used to hold particles. The agitator 120 is disposed within the tank body 110 and is used to agitate the particles within the tank body 110 to maintain a suspended state. The conveying assembly is connected to the tank body 110, while the first outlet 141 of the primary separator 140 and the third outlet 151 of the secondary separator 150 are both located above the tank body 110 and communicate with the tank body 110.
[0045] It should be noted that, in practical applications, the multi-cyclone nanoparticle classifier should maintain sealing, that is, the separator and the tank body 110 in the figure should be sealed to prevent leakage of nanoparticles.
[0046] In one embodiment, the conveying component includes a conveying pipe 111 and a conveying pump 130. The two ends of the conveying pipe 111 are respectively connected to the stirring tank and the conveying pump 130. The end of the conveying pump 130 away from the conveying pipe 111 is connected to the input port of the primary separator 140 to input the particles in the stirring tank into the primary separator 140.
[0047] In one embodiment, the first-stage separator 140 includes a columnar portion and a conical portion that are arranged and connected in sequence along the vertical direction, and the radial dimension of the conical portion gradually decreases from top to bottom; the input port of the first-stage separator 140 is located on the side wall of the columnar portion, the second outlet 143 of the first-stage separator 140 is located at the top of the columnar portion, and the first outlet 141 of the first-stage separator 140 is located at the bottom of the conical portion.
[0048] The primary separator 140 further includes an inlet pipe 142, to which the conveying assembly is connected. The inlet pipe 142 is connected to the outside of the columnar portion and communicates with the input port of the primary separator 140. The input direction of the inlet pipe 142 is angled relative to the radial direction of the columnar portion. As can be seen, after the fluid enters the primary separator 140, a cyclone is formed, which extends from top to bottom along the inner wall of the primary separator 140. After the cyclone enters the tapered portion, the radial dimension of the tapered portion gradually decreases from top to bottom, resulting in an upward airflow in the center of the cyclone.
[0049] Nanoparticles are flung toward the inner wall of the primary separator 140 under centrifugal force, losing their inertial force. Larger particles are discharged from the bottom first outlet 141 into the agitation tank under the influence of gravity, while smaller particles are discharged from the top outlet under the influence of the upward airflow. This allows for the separation of large and small particles.
[0050] It should be noted that the structure of the secondary separator 150 is the same as that of the primary separator 140, that is, the secondary separator 150 uses the same principle to separate large particles from small particles. In addition, preferably, the height of the columnar portion in the secondary separator 150 is higher than the height of the columnar portion in the primary separator 140, and the distance between the input port and the tapered portion in the secondary separator 150 is greater than the distance between the input port and the tapered portion in the primary separator 140. In this way, in the secondary separator 150, after the particles hit the inner wall of the secondary separator 150 and lose their inertial force, the particles descend to a greater height in the columnar portion, and the corresponding particles enter the tapered portion at a faster speed, thereby further separating the small particles.
[0051] What needs to be explained is that, in the separator, the particle that loses inertial force usually falls downward along the inner wall, so in the cylindrical portion, particle usually can not contact with the upward airflow in the middle.After particle enters the tapered portion, particle can gather towards the middle, and upward airflow is also formed at the tapered portion, so particle easily contacts with upward airflow, and small particle is easily taken out of separator by upward airflow.If particle speed is larger in the tapered portion, and the direction of particle speed is downward, can weaken the effect of upward airflow on particle to a certain extent.Therefore, in the secondary separator 150, upward airflow can only drive the particle with smaller particle diameter to flow upward, and namely secondary separator 150 can separate the particle with smaller particle diameter.
[0052] In one embodiment, the collection component includes a main drain pipe 153 and a collection box 154. One end of the main drain pipe 153 is connected to the fourth outlet of the secondary separator 150, and a discharge hole is opened on the side wall of the main drain pipe 153. The collection box 154 is connected to the discharge hole, so that the nanoparticles are collected through the collection box 154.
[0053] Furthermore, the collection assembly includes a collection filter. The collection box 154 has an air inlet and an air outlet. The air inlet is connected to the discharge hole, so that the qualified nanoparticles enter the collection box 154 through the discharge hole and the air inlet. The collection filter is provided at the air outlet to prevent the qualified nanoparticles from being discharged from the collection box 154. In actual application, the discharge hole and the air inlet are connected by a pipe.
[0054] It should be noted that, taking the nanofilter 152 for allowing particles with a diameter of less than 50nm to pass through as an example, during the nanoparticle classification process, the flow path of the fluid is: passing through the nanofilter 152 into the main drain pipe 153, then entering the collection pipe 154 and being discharged from the air outlet; and for particles with a diameter of less than 50nm: after entering the main drain pipe 153, the particles follow the fluid into the collection box 154, and then are blocked by the collection filter and remain in the collection box 154, thereby achieving particle collection. In other embodiments, the collection filter may not be provided, and the air outlet may be set at a higher position, so that the nanoparticles cannot be discharged with the fluid under the action of gravity, thereby achieving nanoparticle collection.
[0055] In one embodiment, the main discharge pipe 153 extends in the vertical direction, and the bottom end of the main discharge pipe 153 is connected to the fourth outlet of the secondary separator 150; the number of the discharge holes and the collection box 154 is multiple, for example Figure 1 There are three discharge holes in the middle, with multiple holes spaced apart vertically. Each collection box 154 is connected to a corresponding discharge hole. Thus, after fluid enters the main discharge pipe 153 at a certain speed, the particles are subjected to gravity and the thrust of the fluid. By controlling the fluid flow rate, particles of different sizes can be blown to different heights, allowing particles of different sizes to enter different collection boxes 154 through discharge holes at different heights, achieving further classification of the nanoparticles.
[0056] Combine Figure 1 For illustration, assume that the nanoparticles entering the main drain pipe 153 have a particle size of less than 50 nm. After the fluid carries the particles into the main drain pipe 153, particles with a particle size greater than 40 nm are the heaviest, and therefore are blown the lowest in the main drain pipe 153. They will follow the fluid through the lowest discharge hole and enter the corresponding collection box 154. Particles with a particle size greater than 30 nm and less than 40 nm are lighter, and therefore are blown higher in the main drain pipe 153. They will follow the fluid through the middle discharge hole and enter the corresponding collection box 154. Particles with a particle size less than 30 nm are the lightest, and therefore are blown the highest in the main drain pipe 153. They will follow the fluid through the top discharge hole and enter the corresponding collection box 154. At the same time, in this embodiment, the pore size of the filter holes on the collection filter provided on the collection box 154 can be 30 nm.
[0057] What can be determined is that if it is necessary to further classify particles of different sizes at the collection component, the flow rate of the fluid and the height of the discharge hole can be determined according to actual conditions. For example, if the fluid flow rate is 3m / s, 4m / s, or 5m / s, the collected particle size can also be below 100nm. The above embodiment can serve as an illustration of the principle.
[0058] In order to facilitate understanding of the technical solution of this application, Figure 1 The process flow of the multi-cyclone nanoparticle classifier in the above embodiment is described as follows:
[0059] The agitation tank stirs the nanoparticles, keeping them suspended. A delivery pump 130 transports the fluid in the agitation tank to the primary separator 140. Upon entering the primary separator 140, the fluid forms a downward-extending cyclone, while an upward airflow forms in the center. Large particles are discharged from the first outlet 141 at the bottom of the primary separator 140 into the agitation tank. Smaller particles, driven by the central airflow, are discharged from the second outlet 143 at the top into the secondary separator 150. Upon entering the secondary separator 150, a cyclone and an upward airflow are also formed within the secondary separator 150. Larger particles are discharged from the third outlet 151 at the bottom of the secondary separator 150 into the agitation tank, while smaller particles flow upward with the airflow. After being filtered by the nanofilter 152, nanoparticles meeting the required size enter the main discharge pipe 153. Subsequently, under the influence of the fluid and gravity, particles of different sizes enter separate collection bins 154 for collection.
[0060] In combination with the above description, it can be understood that the first-stage separator 140 and the second-stage separator 150 can be regarded as the first classification of particles, screening out particles that meet the requirements; and the classification of particles by the collection component can be regarded as the second classification, so as to further collect particles that meet the requirements according to different particle sizes.
[0061] The above is a description of the multi-cyclone nanoparticle classifier. On the other hand, the present application also provides a nanoparticle preparation system, which also includes the multi-cyclone nanoparticle classifier mentioned above.
[0062] In summary, the multi-cyclone nanoparticle classifier and nanoparticle preparation system provided by this application have at least the following advantages:
[0063] 1. It can quickly separate and collect nanoparticles that meet the requirements, with short time consumption and high efficiency;
[0064] 2. By opening multiple discharge holes in the vertical direction on the main discharge pipe 153, the classification of nanoparticles of different particle sizes is achieved under the action of fluid and gravity, and the classification efficiency is high;
[0065] 3. The nanoparticles circulate between the stirring tank and the separator, which can collect the nanoparticles that meet the requirements as much as possible and improve the collection rate.
[0066] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A multi-cyclone nanoparticle classifier, characterized in that: include: A stirring tank for stirring particles; a conveying assembly connected to the stirring tank; A primary separator and a secondary separator, wherein the input port of the primary separator is connected to the conveying assembly, the first outlet of the primary separator and the third outlet of the secondary separator are both connected to the stirring tank to convey particles with larger particle sizes to the stirring tank, and the second outlet of the primary separator is connected to the input port of the secondary separator to input particles with smaller particle sizes into the secondary separator; The collecting assembly is communicated with the fourth outlet of the secondary separator so that the secondary separator can transport particles with smaller particle sizes to the collecting assembly.
2. The multi-cyclone nanoparticle classifier according to claim 1, characterized in that: The device further comprises a nano filter, wherein the nano filter is arranged at the fourth outlet of the secondary separator.
3. The multi-cyclone nanoparticle classifier according to claim 1, characterized in that: The collecting assembly includes a main pipe and a collecting box. One end of the main pipe is connected to the fourth outlet of the secondary separator. A discharge hole is opened on the side wall of the main pipe. The collecting box is connected to the discharge hole.
4. The multi-cyclone nanoparticle classifier according to claim 3, characterized in that: The main pipe extends in a vertical direction, and the bottom end of the main pipe is connected to the fourth outlet of the secondary separator; There are multiple discharge holes and multiple collecting boxes, and the multiple discharge holes are arranged at intervals along the vertical direction. Each collecting box is connected to a corresponding discharge hole.
5. The multi-cyclone nanoparticle classifier according to claim 3, characterized in that: The collecting assembly further includes a collecting filter. The collecting box is provided with an air inlet and an air outlet. The air inlet is communicated with the discharge hole, and the collecting filter is arranged at the air outlet.
6. The multi-cyclone nanoparticle classifier according to claim 1, characterized in that: The primary separator comprises a columnar portion and a conical portion which are arranged in sequence and connected in a vertical direction, and the radial dimension of the conical portion gradually decreases from top to bottom; The input port of the primary separator is located on the side wall of the columnar portion, the second outlet of the primary separator is located on the top of the columnar portion, and the first outlet of the primary separator is located at the bottom of the conical portion.
7. The multi-cyclone nanoparticle classifier according to claim 6, characterized in that: The first-stage separator also includes an air inlet pipe, the conveying assembly is connected to the air inlet pipe, the air inlet pipe is connected to the outer side of the columnar portion, and is communicated with the input port of the first-stage separator, and the input direction of the air inlet pipe is set at an angle to the radial direction of the columnar portion.
8. The multi-cyclone nanoparticle classifier according to claim 7, characterized in that: The structure of the secondary separator is the same as that of the primary separator.
9. A nanoparticle preparation system, characterized in that: The multi-cyclone nanoparticle classifier comprises the multi-cyclone nanoparticle classifier according to any one of claims 1 to 8.