A spinning pneumatic particle generator

Abstract

The present invention discloses a spin-type pneumatic particle generator, which belongs to the field of particle tracing laser measurement technology. The generator comprises a solid shaft fixedly mounted on an air supply device, a rotating cap disposed on the outer surface of the solid shaft, and the rotating cap capable of rotating around the solid shaft. An air inlet cavity is disposed in the rotating cap, and the air inlet cavity opens toward one side of the air supply device. A plurality of layers of through holes are provided on the side wall of the rotating cap, and the through holes are disposed along a plane perpendicular to the solid shaft, with the ends of the through holes connected to the air inlet cavity. In the present invention, air is supplied to the air inlet cavity through the air supply device, and after the gas enters the air inlet cavity, it is ejected through the plurality of layers of through holes on the rotating cap. When the gas is ejected outward, the rotating cap is subjected to a reaction thrust of the gas along the direction of the through holes, thereby causing the rotating cap to rotate and generate a vortex. The high-pressure vortex generated by the rotating cap is used to sweep the bed powder, and the particles are stably and evenly carried to the test area, ensuring uniform spreading of the particles. By adjusting the flow rate of the intake gas, the particle concentration can be effectively adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of particle tracing laser measurement, in particular to a spinning type pneumatic particle generator. Background Art

[0002] A particle generator is a device used to generate tracer particles. It is mainly used in particle tracer laser measurement technologies such as particle image velocimetry (PIV). The basic principle of PIV technology is to sow tracer particles of appropriate concentration in the flow field to be measured. The particles will move with the movement of the flow field. Laser is used to illuminate the flow field area to be measured. Through two or more consecutive exposures, the position of the tracer particles at different times is recorded using imaging equipment. The displacement of the particles at each point is calculated through image analysis technology. The time interval between the displacement and exposure can be used to obtain information such as the flow velocity vector at each point in the flow field.

[0003] PIV technology has high requirements for tracer particles. It is necessary to ensure that the tracer particle concentration is high and the distribution is uniform. Otherwise, the image acquisition results of the PIV experiment will be deteriorated, affecting the velocity measurement results. The existing commonly used tracer particle generator uses high-speed airflow to directly blow the surface of the tracer particle layer in the container, and uses the airflow to bring the tracer particles into the flow field test area.

[0004] To ensure the uniformity of tracer particles, multiple layers of filters or filter valves are generally set up. Although the filtering method ensures the uniform spreading of tracer particles, it also intercepts some particles, resulting in a large-scale reduction in particle concentration. It is impossible to ensure that the particle concentration meets the standard and to achieve free adjustment of the tracer particle concentration. Therefore, it is difficult for existing technologies to simultaneously meet the conditions of uniform particle spreading, standard particle concentration and free adjustment. Summary of the Invention

[0005] To this end, the present invention provides a spinning pneumatic particle generator to solve the technical problem that the existing technology is difficult to simultaneously meet the requirements of uniform particle spreading in the flow field, standard particle concentration and free adjustment.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A spin-type pneumatic particle generator comprises a solid shaft fixedly mounted on an air supply device, a rotating cap is disposed on the outer shell of the solid shaft, and the rotating cap is capable of rotating around the solid shaft;

[0008] An air inlet cavity is provided in the rotary plugging cap, and the air inlet cavity opens toward one side of the air supply device;

[0009] A plurality of through holes are provided on the side wall of the rotary blocking cap, wherein the through holes are arranged along a plane perpendicular to the solid axis, and the ends of the through holes are connected to the air inlet cavity;

[0010] The opening of the air inlet cavity is directly opposite to the air outlet of the air supply device, and the gas enters the air inlet cavity from the air supply device and is ejected through the through hole;

[0011] There is an angle between the direction of the through hole and the radius direction of its position, so that when the gas is ejected outward, the rotating plugging cap is subjected to the reaction thrust of the gas along the direction of the through hole and then rotates to generate a vortex.

[0012] Furthermore,

[0013] The angle between the direction of each through hole and the radial direction of the position where the through hole is located is consistent.

[0014] Furthermore,

[0015] The through holes at the same height position are arranged in a circumferential array on the side wall of the rotating plugging cap to form a through hole layer;

[0016] Several through-hole layers are evenly distributed at different height positions of the rotating plugging cap.

[0017] Furthermore,

[0018] The solid shaft comprises a first shaft segment, a second shaft segment and a third shaft segment connected in sequence from top to bottom;

[0019] The outer diameter of the first shaft segment is greater than the outer diameter of the second shaft segment, and the outer diameter of the second shaft segment is greater than the outer diameter of the third shaft segment;

[0020] Wherein, the outer wall of the third shaft segment is provided with a thread, and the third shaft segment is threadedly assembled on the air supply device.

[0021] Furthermore,

[0022] A first bearing and a second bearing are respectively sleeved on the outer sides of the two ends of the second shaft segment;

[0023] An annular groove corresponding to the position of the first bearing and the second bearing is formed on the inner wall of the rotary blocking cap, and the first bearing and the second bearing cooperate with the annular groove.

[0024] Furthermore,

[0025] An upper sleeve is provided on the outer cover of the second shaft segment, wherein the top of the upper sleeve supports the first bearing and the bottom of the upper sleeve contacts the second bearing;

[0026] The first bearing is located in one of the annular grooves between the first shaft section and the upper sleeve.

[0027] Furthermore,

[0028] The outer shell of the second shaft section is provided with a lower shaft sleeve, the top of the lower shaft sleeve supports the second bearing, and the bottom of the lower shaft sleeve contacts the air supply device;

[0029] The second bearing is located in one of the annular grooves at the lower limit of the pressing between the upper sleeve and the lower sleeve.

[0030] Furthermore,

[0031] The bottom of the lower sleeve exceeds the second shaft section and the rotating plugging cap, so that a gap exists between the rotating plugging cap and the air supply device.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] In the present invention, air is supplied to the air inlet chamber through an air supply device. After entering the air inlet chamber, the gas is ejected through several layers of through holes on the rotating blocking cap. When the gas is ejected outward, the rotating blocking cap is subjected to a reaction thrust of the gas in the direction of the through holes, thereby causing the rotating blocking cap to rotate and generate a vortex. The high-pressure vortex generated by the rotating blocking cap sweeps the bed powder. Under the continuous contact of the high-pressure vortex gas, the particles are stably and evenly carried to the test area, ensuring uniform spreading of the particles.

[0034] Furthermore, by adjusting the flow rate of the intake gas, swirls of different intensities can be generated. Under swirls of different intensities, uniform particle flows of different concentrations can be formed, and effective regulation of particle concentration can be achieved through gas regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0036] Figure 1 A schematic structural diagram of a spin-type pneumatic particle generator provided in an embodiment of the present invention;

[0037] Figure 2 A schematic top view of a spinning pneumatic particle generator provided by an embodiment of the present invention;

[0038] Figure 3 for Figure 2 Cross-sectional view along the AA axis;

[0039] Figure 4 for Figure 2 Stereoscopic cross-sectional view in the AA direction;

[0040] Figure 5A schematic diagram of the main structure of a spinning pneumatic particle generator provided by an embodiment of the present invention;

[0041] Figure 6 for Figure 5 Cross-sectional view along the BB direction;

[0042] Figure 7 for Figure 5 Cross-sectional view in CC direction;

[0043] Figure 8 for Figure 4 Schematic diagram of the structure without the first bearing and the second bearing installed.

[0044] The numbers in the figure represent the following:

[0045] 1-solid shaft; 2-through hole; 3-air inlet chamber; 4-first bearing; 5-thread; 6-lower sleeve; 7-upper sleeve; 8-rotating plugging cap; 9-first shaft section; 10-second shaft section; 11-third shaft section; 12-second bearing; 13-annular groove. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] like Figure 3 、 Figure 4 and Figure 5 As shown, the present invention provides a spin-type pneumatic particle generator, comprising a solid shaft 1 fixedly mounted on an air supply device, a rotating blocking cap 8 being provided on the outer shell of the solid shaft 1, and the rotating blocking cap 8 being able to rotate around the solid shaft 1;

[0048] An air inlet cavity 3 is provided in the rotary blocking cap 8, and the air inlet cavity 3 opens toward one side of the air supply device;

[0049] A plurality of through holes 2 are provided on the side wall of the rotary plugging cap 8. The through holes 2 are arranged along a plane perpendicular to the solid shaft 1. The ends of the through holes 2 are connected to the air inlet cavity 3.

[0050] The opening of the air inlet cavity 3 faces the air outlet of the air supply device, and the gas enters the air inlet cavity 3 from the air supply device and is ejected through the through hole 2;

[0051] There is an angle between the direction of the through hole 2 and the radial direction of its position, so that when the gas is ejected outward, the rotating blocking cap 8 is subjected to a reaction thrust along the direction of the through hole 2, pushing the rotating blocking cap 8 to rotate to generate a vortex.

[0052] In the present invention, air is supplied to the air inlet chamber 3 through an air supply device. After entering the air inlet chamber 3, the gas is ejected through several layers of through holes 2 on the rotating blocking cap 8. Since there is an angle between the direction of the through hole 2 and the radial direction of its position, when the gas is ejected outward, the rotating blocking cap 8 is subjected to a reaction thrust of the gas along the direction of the through hole 2, thereby causing the rotating blocking cap 8 to rotate and generate a vortex. The vortex generated by the rotating blocking cap 8 is used to sweep the bed powder, thereby achieving uniform spreading of the tracer particles into the flow field.

[0053] like Figure 6 and Figure 7 As shown in the figure, on the basis of ensuring uniform spreading of tracer particles, by adjusting the flow rate of intake gas, swirls of different intensities can be generated. Under swirls of different intensities, uniform particle flows of different concentrations can be formed, and effective regulation of particle concentration can be achieved through gas regulation.

[0054] By adjusting the gas source pressure of the air supply device, the flow rate of the intake gas can be regulated. When the gas source pressure increases, the gas flow through the through hole 2 increases, the rotation speed of the rotating blocking cap 8 increases, and the turbulence of the airflow increases, which promotes the increase in the concentration of uniform particle flow carried by the airflow; when the gas source pressure decreases, the gas flow through the through hole 8 decreases, the rotation speed of the rotating blocking cap 8 decreases, and the concentration of uniform particle flow carried by the airflow decreases.

[0055] If the vortex generated by the rotating plugging cap 8 is to be used to evenly spread the tracer particles into the flow field, the rotating plugging cap 8 must be kept rotating at a uniform speed. In order to make the rotating plugging cap 8 rotate at a uniform speed, the angle between the direction of each through hole 2 and the radial direction of its position is consistent. In this way, the gas reverse thrust received by each position of the rotating plugging cap 8 in the circumference is consistent. Under the reverse thrust of the same gas at multiple points, the rotating plugging cap 8 can generate a uniform vortex when rotating.

[0056] In order to achieve uniform rotation of the rotating blocking cap 8, in addition to making the angle between the direction of each through hole 2 and the radial direction of its position consistent, it is also necessary to make each layer of through holes 2 evenly distributed along the circumference of the rotating blocking cap 8. To this end, the through holes 2 at the same height position are arranged in a circular array on the side wall of the rotating blocking cap 8 to form a through hole layer, and several through hole layers are evenly distributed at different height positions of the rotating blocking cap 8.

[0057] Different height positions can all be subjected to a driving force for rotation in the circumferential direction, further promoting the rotary plugging cap 8 to freely rotate around the solid shaft 1 .

[0058] like Figure 1 and Figure 2As shown, in actual application, two layers of through holes 2 can be set on the side wall of the rotating plugging cap 8, and the number of through holes 2 in each layer is 9. Different gas swirls can be obtained by adjusting the number and angle of the through holes 2 to meet the needs of different tracer particle concentrations. Therefore, during manufacturing, the required diameter and number of through holes 2 can be calculated based on the pressure required for the idling of the rotating plugging cap 8. The gas source pressure of the gas supply device can be adjusted according to the experimental working conditions to change the gas flow rate flowing through the through holes 2, and the concentration of the tracer particles can be regulated in real time.

[0059] During specific implementation, the pressure required for the rotation of the rotating cap 8 is only 0.2Mpa. A high-pressure gas cylinder is used as a gas supply device to provide a pressure of 0.4Mpa. By spraying tracer particles into the environment under the action of gas pressure, the tracer particle concentration required for PIV velocity measurement can be generated. When the experimental conditions change, the tracer particle concentration that meets the experimental requirements can be generated by increasing the pressure of the gas tank. For subsonic, transonic, and supersonic experimental conditions, it can meet the condition that the secondary flow pressure is less than the mainstream pressure to produce a continuous and stable tracer particle concentration.

[0060] In the present invention, the solid shaft 1 can not only be used to install the entire structure on the air supply device, but also can be used to limit the installation of the rotating plugging cap 8 so that the rotating plugging cap 8 can rotate stably and freely. Specifically, the solid shaft 1 in the present invention adopts the following preferred embodiment: the solid shaft 1 includes a first shaft section 9, a second shaft section 10, and a third shaft section 11 connected in sequence from top to bottom;

[0061] The outer diameter of the first shaft segment 9 is greater than the outer diameter of the second shaft segment 10 , and the outer diameter of the second shaft segment 10 is greater than the outer diameter of the third shaft segment 11 ;

[0062] The outer diameters of the first shaft segment 9, the second shaft segment 10 and the third shaft segment 11 are gradually reduced in order to further facilitate the installation of each shaft segment in the solid shaft 1 and to limit the rotation of the plug cap 8;

[0063] Among them, the outer wall of the third shaft segment 11 is provided with a thread 5, and the third shaft segment 11 is threadedly assembled on the air supply device. The third shaft segment 11 realizes the fixed installation of the solid shaft 1 as a whole. The thread 5 on the third shaft segment 11 is completely assembled in the threaded hole on the air supply device. The outer diameter of the second shaft segment 10 must be larger than the inner diameter of the threaded hole, and the second shaft segment 10 is above the air supply device.

[0064] like Figure 8As shown, the second shaft section 10 is mainly used to install and limit the rotating plugging cap 8. Specifically, a first bearing 4 and a second bearing 12 are respectively sleeved on the outer sides of the two ends of the second shaft section 10. An annular groove 13 corresponding to the position of the first bearing 4 and the second bearing 12 is opened on the inner wall of the rotating plugging cap 8. The first bearing 4 and the second bearing 12 cooperate with the annular groove 13. In other words, the rotating plugging cap 8 is movably installed on the outside of the solid shaft 1 through the first bearing 4 and the second bearing 12.

[0065] Preferably, the first bearing 4 and the second bearing 12 are generally thin-walled bearings, and may also be deep groove ball bearings, needle roller bearings, or dustproof bearings to prevent powdered tracer particles from entering the bearings.

[0066] A bearing generally consists of an inner ring and an outer ring. A plurality of balls are arranged between the inner ring and the outer ring so that the outer ring can rotate around the outer circumference of the inner ring. Correspondingly, in the first bearing 4 and the second bearing 12, the inner ring is sleeved outside the second shaft section 10 and remains fixed, while the outer ring cooperates with the annular groove 13 of the rotating plug cap 8, and the outer ring can rotate around the outer circumference of the inner ring together with the rotating plug cap 8.

[0067] Since the first bearing 4 and the second bearing 12 are respectively sleeved on the second shaft segment 10, if the height positions of the first bearing 4 and the second bearing 12 cannot be determined, a stable swirl cannot be generated. Therefore, the first bearing 4 and the second bearing 12 need to be limited in the height direction to enable the rotary blocking cap 8 to rotate relative to a certain fixed height position outside the solid shaft 1. Specifically, in order to limit the first bearing 4 on the first shaft segment 10, an upper sleeve 7 is provided on the outer surface of the second shaft segment 10. The top of the upper sleeve 7 supports the first bearing 4, and its bottom contacts the second bearing 12. The first bearing 4 is pressed against the lower limit on the first shaft segment 9 and the upper sleeve 7 and is located in the annular groove 13 on the upper part of the rotary blocking cap 8;

[0068] Similarly, in order to limit the second bearing 12 on the second shaft section 10, a lower sleeve 6 is provided on the outer sleeve of the second shaft section 10. The top of the lower sleeve 6 supports the second bearing 12, and its bottom contacts the air supply device. The second bearing 12 is pressed to the lower limit by the upper sleeve 7 and the lower sleeve 6 and is located in the annular groove 13 at the bottom of the rotating plug 8.

[0069] Among them, the bottom of the first shaft section 9 is in close contact with the inner ring of the first bearing 4, the upper sleeve 7 is in close contact with the inner rings of the first bearing 4 and the second bearing 12 at the upper and lower positions respectively, and the inner ring of the second bearing 12 is in close contact with the lower sleeve 6.

[0070] After the solid shaft 1 is installed and fixed on the air supply device, the positions of the first shaft section 9, the second shaft section 10 and the third shaft section 11 are all limited. In the height direction of the first bearing 4, the first shaft section 9, the first bearing 4, the upper shaft sleeve 7, the second bearing 12, and the lower shaft sleeve 6 are in close contact from top to bottom. The bottom of the air supply device supports the lower shaft sleeve 6. When the position between the air supply device and the first shaft section 9 is limited, the first bearing 4, the upper shaft sleeve 7, the second bearing 12, and the lower shaft sleeve 6 therebetween are also limited to a specific height position, thereby realizing the position limitation of the corresponding structure in the height direction.

[0071] After the height positions of the first bearing 4, the upper sleeve 7, the second bearing 12, and the lower sleeve 6 are defined, the height position of the rotating blocking cap 8 is also defined and can rotate freely.

[0072] Among them, the solid shaft 1, the first bearing 4, the upper sleeve 7, the second bearing 12, the lower sleeve 6, and the rotating cap 8 are all detachable parts. The installation order is: first install the first bearing 4, the upper sleeve 7, and the second bearing 12 in the rotating cap 8, then install the solid shaft 1 therein, and finally install the lower sleeve 6 on the outside of the second shaft section 10, and thread the first shaft section 9 on the air supply device.

[0073] The rotating plugging cap 8 is arranged above the air supply device. If the rotating plugging cap 8 contacts the top of the air supply device, friction will be generated between the rotating plugging cap 8 and the air supply device, hindering the rotation of the rotating plugging cap 8. To avoid the above situation, the present invention makes the following design. The bottom of the lower sleeve 6 exceeds the second shaft section 10 and the rotating plugging cap 8, so that there is a gap between the rotating plugging cap 8 and the air supply device. Under normal circumstances, in order to avoid the gap being too large and excessive airflow leakage, the bottom of the lower sleeve 6 exceeds the second shaft section 10 and the rotating plugging cap 8 by about 1 mm, ensuring the free rotation of the rotating plugging cap 8 while reducing gas leakage.

[0074] In the present invention, the solid shaft 1, the rotary plugging cap 8, the upper shaft sleeve 7 and the lower shaft sleeve 6 are all made of aluminum.

[0075] In a spin-type pneumatic particle generator provided by the present invention, a rotating cap 8 is placed in a particle holding chamber, and a third shaft segment 11 and an air supply device are placed outside the particle holding chamber. The size of the rotating cap 8 can be changed according to the size of the entrance of the particle holding chamber. The size of the inner diameter and outer diameter of the rotating cap 8 is not uniquely determined, but needs to be determined jointly based on the solid shaft 1, the upper sleeve 7 and the lower sleeve 6, the air supply device, the particle holding chamber, etc.

[0076] In summary, the implementation process of the present invention is:

[0077] Install the entire device;

[0078] The air supply device is controlled to introduce gas into the air inlet chamber 3. After entering the air inlet chamber 3, the gas is ejected through the through hole 2. After the gas is ejected from the through hole 2, an airflow is generated. Since there is an angle between the direction of the through hole 2 and the radial direction of its position, when the gas is ejected outward, the rotating blocking cap 8 is subjected to a reaction thrust of the gas along the direction of the through hole 2, which pushes the rotating blocking cap 8 to rotate. The rotating rotating blocking cap 8 generates a uniform swirl.

[0079] The rotating plugging cap 8 generates a swirl that sweeps the powder bed, spreading the tracer particles evenly into the flow field.

[0080] At the same time, the flow rate of the incoming gas can also be used to control the concentration of the tracer particles spread into the flow field. When the gas flow rate of the through hole 2 increases, the rotation speed of the rotating cap 8 increases, and the concentration of the tracer particles in the flow field increases. When the gas flow rate of the through hole 2 decreases, the rotation speed of the rotating cap 8 decreases, and the concentration of the tracer particles in the flow field decreases.

[0081] In summary, the present invention addresses the problem that the existing technology is difficult to simultaneously meet the requirements of uniform particle spreading in the flow field and particle concentration that meets the standard and can be freely adjusted. A self-spinning pneumatic particle generator is designed. Gas is supplied to the air inlet chamber 3 through an air supply device. After entering the air inlet chamber 3, the gas is ejected through several layers of through holes 2 on the rotating blocking cap 8. When the gas is ejected outward, the rotating blocking cap 8 is subjected to a reaction thrust of the gas along the through holes 2, thereby causing the rotating blocking cap 8 to rotate and generate a vortex. The high-pressure vortex generated by the rotating blocking cap 8 sweeps the bed powder. Under the continuous contact with the high-pressure vortex gas, the particles are stably and evenly carried to the test area, ensuring uniform particle spreading.

[0082] Furthermore, by adjusting the flow rate of the intake gas, swirls of different intensities can be generated. Under swirls of different intensities, uniform particle flows of different concentrations can be formed, and effective regulation of particle concentration can be achieved through gas regulation.

[0083] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A spin-type pneumatic particle generator, characterized in that: It comprises a solid shaft (1) fixedly mounted on an air supply device, a rotating cap (8) being provided on the outer shell of the solid shaft (1), and the rotating cap (8) being capable of rotating around the solid shaft (1); An air inlet cavity (3) is provided in the rotary blocking cap (8), and the air inlet cavity (3) opens toward one side of the air supply device; A plurality of layers of through holes (2) are provided on the side wall of the rotary blocking cap (8), the through holes (2) being arranged along a plane perpendicular to the solid shaft (1), and the ends of the through holes (2) being connected to the air inlet cavity (3); The opening of the air inlet cavity (3) faces the air outlet of the air supply device, and the gas enters the air inlet cavity (3) from the air supply device and is ejected through the through hole (2); There is an angle between the direction of the through hole (2) and the radial direction of the position where the through hole (2) is located, so that when the gas is ejected outward, the rotating plug (8) is subjected to the reaction thrust of the gas along the direction of the through hole (2) and then rotates to generate a vortex.

2. A spin-type pneumatic particle generator according to claim 1, characterized in that: The angle between the direction of each through hole (2) and the radial direction of the position where it is located is consistent.

3. The spin-type pneumatic particle generator according to claim 1, characterized in that: The through holes (2) at the same height position are arranged in a circumferential array on the side wall of the rotating plug cap (8) to form a through hole layer; Several through-hole layers are evenly distributed at different height positions of the rotating plugging cap (8).

4. The spin-type pneumatic particle generator according to claim 1, characterized in that: The solid shaft (1) comprises a first shaft section (9), a second shaft section (10) and a third shaft section (11) which are sequentially connected from top to bottom; The outer diameter of the first shaft segment (9) is greater than the outer diameter of the second shaft segment (10), and the outer diameter of the second shaft segment (10) is greater than the outer diameter of the third shaft segment (11); Wherein, the outer wall of the third shaft section (11) is provided with a thread (5), and the third shaft section (11) is threadedly assembled on the air supply device.

5. The spin-type pneumatic particle generator according to claim 4, characterized in that: A first bearing (4) and a second bearing (12) are respectively sleeved on the two ends of the second shaft section (10); An annular groove (13) corresponding to the position of the first bearing (4) and the second bearing (12) is formed on the inner wall of the rotating plug cap (8); the first bearing (4) and the second bearing (12) cooperate with the annular groove (13).

6. The spin-type pneumatic particle generator according to claim 5, characterized in that: The second shaft section (10) is provided with an upper shaft sleeve (7) on its outer sleeve, the top of the upper shaft sleeve (7) supports the first bearing (4), and the bottom of the upper shaft sleeve (7) contacts the second bearing (12); The first bearing (4) is located in one of the annular grooves (13) at the lower limit of the pressing between the first shaft section (9) and the upper shaft sleeve (7).

7. The spin-type pneumatic particle generator according to claim 6, characterized in that: The outer cover of the second shaft section (10) is provided with a lower shaft sleeve (6), the top of the lower shaft sleeve (6) supports the second bearing (12), and the bottom of the lower shaft sleeve (6) contacts the air supply device; The second bearing (12) is located in one of the annular grooves (13) at the lower limit of the pressing between the upper sleeve (7) and the lower sleeve (6).

8. The spin-type pneumatic particle generator according to claim 7, characterized in that: The bottom of the lower shaft sleeve (6) exceeds the second shaft section (10) and the rotating plug cap (8), so that a gap exists between the rotating plug cap (8) and the air supply device.

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