TWI581863B - Particle atomizer and system thereof - Google Patents

Description

Powder disperser and its system

The present invention relates to a powder disperser and a system thereof, and more particularly to a powder disperser capable of atomizing powder and a powder dispersing system capable of supplying particles of a specific particle size range.

With the advent of more and more nano-products, in the process of manufacturing and using these products, nano-materials may be released or dissipated and thus affect the human body or the environment, and thus gradually attract the attention of all countries in the world. In order to effectively disperse nanomaterials for subsequent toxicity or inhalation studies, past scholars have used Sieve Shaker, Small Scale Powder Disperser (SSPD, Model 3433, TSI Inc., MN). , USA), etc. to disperse nanomaterials; however, although the sieve shaker can rupture nanoparticle or carbon nanotubes and has a stable number of concentrations, the number of concentrations produced is not high. On the other hand, although the fine powder disperser can atomize the powder into a sub-nano grade, it is easy to lose a large amount of powder to the throat of the venturi, and thus cannot be used for dispersing the powder for a long period of time.

One of the main objects of the present invention is to provide a powder disperser and a system thereof which can atomize powder and produce a gas gel.

In order to achieve the foregoing and other objects, the powder disperser of the present invention comprises a powder storage tank, a micronized element, a pumping passage, a suspending means and a micronizing means, and a powder chamber is defined inside the powder storage tank. a chamber for accommodating a plurality of powders; the micronized element defines a large diameter hole, a small diameter hole, and a micropores connected between the large and small diameter holes; the pumping passage is connected between the powder chamber and the micro holes; the suspending means is for suspending the powder in the powder chamber; The micronization means is configured to supply a gas flow sequentially flowing through the large diameter hole, the micro hole and the small diameter hole, and the powder suspended in the powder cavity is sucked into the micro hole through the extraction channel, and at least The powder partially sucked into the micropores is atomized by the gas flow flowing through the micropores.

To achieve the foregoing and other objects, the powder dispersion system of the present invention comprises a powder disperser as described above and a water film type particle impactor defining an impact chamber, the water film type particle impact The device has a spray head, an impact surface, an air intake means and a flushing means. The water film type particle impactor further has an air flow outlet and a water flow outlet respectively communicating with the impact chamber; the spray head has a plurality of nozzles connected to an air flow inlet And the impact chamber; the impact surface is located in the impingement chamber and facing the nozzles; the air intake means is configured to introduce the airflow discharged from the small diameter hole into the impact chamber through the airflow inlet and the nozzle, and then Discharged from the airflow outlet; the flushing means is for discharging water to the impact surface and discharging the waterflow outlet.

Through the micronization means of the powder disperser, the powder in the powder storage tank can be micronized, and the number of generated particles is high and stable, and the powder disperser is also suitable for long-term use, and by the powder The water-film type particle impactor of the bulk dispersion system can intercept and separate the particles of larger particle size, and can supply the particles containing only the smaller particle size.

1‧‧‧ powder diffuser

10‧‧‧ powder storage tank

12‧‧‧ powder chamber

121‧‧‧ powder

123‧‧‧ bottom side

125‧‧‧Upper chamber

127‧‧‧ lower chamber

129‧‧‧ particles

2‧‧‧Powder Dispersion System

20‧‧‧Micronized components

22‧‧‧ Large diameter hole

24‧‧‧Small hole

26‧‧‧Micropores

28‧‧‧Hose

30‧‧‧Sipper

32‧‧‧Select channel

40‧‧‧Upstream generating components

401‧‧‧Upstream chamber

50‧‧‧Perforated plate

51‧‧‧Perforation

60‧‧‧Porous components

61‧‧‧ bottom side

63‧‧‧ top side

70‧‧‧ gyrotron

71‧‧‧ Fixed Department

73‧‧‧movable department

80‧‧‧Water film type particle impactor

81‧‧‧shock chamber

82‧‧‧ sprinkler

821‧‧‧ nozzle

83‧‧‧ impact surface

84‧‧‧ air inlet

85‧‧‧Airflow exit

86‧‧‧ water inlet

87‧‧‧Water outlet

88‧‧‧ wall

403‧‧‧ Vents

41‧‧‧Ontology

411‧‧‧ side edge

413‧‧‧ upper surface

43‧‧‧ Column

433‧‧‧ upper surface

90‧‧‧Water film type particle impactor

91‧‧‧impact board

93‧‧‧ Wet concave porous media

P1‧‧‧ first air pressure

P2‧‧‧second air pressure

1 is a cross-sectional view of a powder disperser according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view of a micronized element according to a first embodiment of the present invention; and FIG. 3 is an upflow generating element of a first embodiment of the present invention; Top view 4 is a plan view of a porous plate according to a first embodiment of the present invention; FIG. 5 is a schematic view showing a powder dispersion system according to a first embodiment of the present invention; and FIG. 6 is a schematic view of a water film type particle impactor according to a second embodiment of the present invention; 7 is a schematic view showing a combination of a powder disperser and an analytical instrument according to a first embodiment of the present invention; and FIG. 8 is a schematic view showing a combination of a powder disperser, a water film type microparticle impactor and an analytical instrument according to the first embodiment of the present invention; The relationship between the total number of NPCNTs and the time in the first embodiment of the present invention; FIG. 10 is a relationship between the total number of PCNTs in the first embodiment of the present invention and time; and FIG. 11 is a mass concentration distribution of the NPCNTs in the first embodiment of the present invention; Fig. 12 is a PCNT mass concentration distribution of the first embodiment of the present invention.

Please refer to FIG. 1 , which is a powder disperser 1 according to a first embodiment of the present invention, which comprises a powder storage tank 10 , a micronizing element 20 , a straw 30 , a suspension means and a porous element 60 . , a convoluted oscillator 70, and a micronization means.

A powder chamber 12 is defined inside the powder storage tank 10 for accommodating a plurality of powders 121.

As shown in FIG. 2, the micronized element 20 defines a large diameter hole 22, a small diameter hole 24, and a micro hole 26 communicating between the large diameter hole 22 and the small diameter hole 24, the large diameter hole The aperture of the aperture 22 is larger than the aperture 24, and the aperture of the aperture 24 is larger than the aperture 26. In the embodiment, the microparticle 20 is disposed above the powder reservoir 10. The diameter hole 22, the small diameter hole 24, and the micro hole 26 are arranged in a straight line and the geometric centers of the three are on the same straight line. In this embodiment, the large diameter hole 22, the small diameter hole 24 and the micro hole 26 are each a cylindrical space. In other possible embodiments, the large diameter hole 22, the small diameter hole 24 and the micro hole 26 are at least One may also have a conical space.

The suction tube 30 is disposed in the micronizing element 20 and extends into the powder chamber 12 of the powder storage tank 10. A suction channel 32 is defined in the straw 30, and the extraction channel 32 is orthogonal to the micronizing element 20. The micro-hole 26 connects the scooping channel 32 between the powder chamber 12 and the micro-hole 26. In other embodiments, the scooping channel 32 can be formed at the interface between the powder reservoir 10 and the micronizing element 20, and the straw 30 can be omitted.

The suspension means is for suspending the powders 121 in the powder chamber 12, and the powder 121 suspended in the powder chamber 12 can further enter the particles through the extraction passage 32 by the action of the micronization means. Element 20. The levitation means may be a device capable of generating an upward flow in the powder chamber 12, for example, an upflow generating element 40 is disposed on the bottom side 123 of the powder chamber 12, and the upward flow means a substantial downward The moving airflow causes the powder to float against the gravity under the action of the airflow. In this embodiment, the suspension means includes an upflow generating element 40 and a perforated plate 50. The upflow generating element 40 is disposed on the bottom side 123 of the powder chamber 12, so that the upward flow can be evenly distributed in the The powder chamber 12, as shown in FIG. 3, the upflow generating element 40 can be designed to have a body 41 and eight columns 43 radially disposed on a side edge 411 of the body 41. The body 41 And the internal portions of the upper surface 413 and the upper surface 433 of the plurality of columns 43 are provided with a plurality of air outlets 403, and the air outlets 403 Connected to the upflow chamber 401 and the powder chamber 12, one of the columns 43 of the upflow generating element 40 can be directly or indirectly connected to a gas supply device such as an air pump or a gas cylinder, when the gas enters the upflow After the element 40 is generated, the gas flows upward from the upflow chamber 401 through the outlet holes 403 to generate an upward flow in the powder chamber 12. In other embodiments, the shape, structure, and number of the air outlets 403 of the upflow generating element 40 may vary depending on requirements; the perforated plate 50 is disposed in the powder chamber 12 to separate the powder chamber 12 into An upper chamber 125 and a lower chamber 127 for accommodating the powders 121, the upflow generating element 40 is disposed in the lower chamber 127, as shown in FIG. As shown, the perforated plate 50 is provided with a plurality of perforations 51. The upper chamber 125 and the lower chamber 127 are in communication with each other only by the perforations 51, whereby the upward flow generated by the ascending flow generating element 40 can be The perforations 51 are ejected toward the upper chamber 125 at a relatively high flow rate, making the powders 121 more easily suspended in the upper chamber 125. In other embodiments, the suspension means can be changed to a vibration component disposed in the powder chamber, and the powder is carried on the vibration component. The vibration component can be driven up and down by the driving component, and when the vibration component vibrates, The powder is bounced and temporarily suspended in the powder chamber to achieve the purpose of suspension.

In order to prevent the powder 121 from falling from the upper chamber 125 to the lower chamber 127, the powder disperser 1 of the present embodiment has the porous member 60. The porous member 60 is disposed in the powder chamber 12 and adjacent to the bottom of the perforated plate 50. The porous member 60 has a bottom side 61, a top side 63, and a plurality of openings for the upward flow to flow from the bottom side 61. The flow passages of the top side 63 have a smaller diameter than the particle diameters of the powders 121, whereby the flow passages can only pass the upward flow, and the powders 121 cannot pass through the flow passages. It falls to the bottom side 123 of the powder chamber 12. In other possible embodiments, the porous member 60 may also be omitted. For example, if the diameter of the through hole 51 of the porous plate 50 is not larger than the particle diameter of the powder 121, the powder 121 does not fall to the lower chamber 127. The porous member 60 can be omitted.

The orbital shaker 70 has a fixed portion 71 and a movable portion 73 movably disposed on the fixed portion 71. The powder storage tank 10 is carried by the movable portion 73. The powder storage tank 10 can be shaken by the movable portion 73 to uniformly disperse the powder 121 in the powder chamber. Where the other powders are evenly distributed in the powder chamber by means of suspension means or other means, the swirling oscillator 70 may also be inoperative or omitted.

The micronization means is for supplying a gas flow sequentially flowing through the large diameter hole 22, the micro hole 26 and the small diameter hole 24 of the micronization element 20, and the powder 121 suspended in the powder chamber 12 The micropores 26 are sucked through the scooping passage 32 of the straw 30, and the powder 121 at least partially sucked into the micropores 26 is flowed. The gas flow passing through the micropores 26 is atomized, and the gas flow supplied by the micronization means has a first gas pressure P1 in the large diameter hole 22 and a second gas pressure P2 in the small diameter hole 24. In detail, the flow of the gas supplied by the micronizing means flows from the large diameter hole 22 to the small diameter hole 24, since the micro hole 26 has a small cross-sectional area, resulting in an increase in the flow velocity of the gas flow and a decrease in pressure. The micropores 26 form a negative pressure suction force with respect to the powder chamber 12, so that the powder 121 suspended in the powder chamber 12 is sucked into the micropores 26 via the scooping passage 32, and then at least partially The powder 121 is micronized by the shearing force generated by the high-speed airflow, and the "micronization" means that the powder 121 is dispersed into a plurality of fine particles 129 having a small particle diameter. In this embodiment, the second air pressure P2 is not more than 0.528 times the first air pressure P1. Under this condition, the change of the air flow rate at the end of the large diameter hole 22 does not substantially affect the air flow flowing out of the small diameter hole 24, and That is, the air flow rate of the small diameter hole 24 can be maintained at a constant value, which is advantageous for subsequent data analysis and calculation, but the relationship between the first air pressure P1 and the second air pressure P2 is not limited thereto. As a possible embodiment, the micronization means may have an air compressor or other high pressure gas generating means directly or indirectly connected to the large diameter hole 22 to supply a desired air flow.

When the powder disperser 1 is actuated, the powder 121 in the powder reservoir 10 is suspended in the powder chamber 12 by the suspending means, and the micronizing means sucks the powders 121 from the scooping passage 32. The micronizing device 20 further micronizes the powders 121 in the micropores 26 to produce microparticles 129 having small particle diameters, which can be used for research purposes such as toxicity research or application. Other occasions where fine particles are required.

As shown in FIG. 5, in order to preliminarily process the fine particles 129 produced by the powder disperser 1, the present invention further provides a powder dispersion system 2 having the above-described powder disperser 1 and a water film. After the fine particle impactor 80 (WFPI) is discharged through the small diameter hole 24, the fine particle 129 is introduced into the water film type particle impactor 80, and the water film type particle impactor 80 has a larger particle diameter. The particles are trapped, and the discharge mainly contains only particles having a predetermined particle diameter or less. The water film type particle impactor 80 can be directly Alternatively or indirectly connected to the powder disperser 1, the powder disperser 1 and the water film type microparticle impactor 80 may be coupled to each other by, for example, a connecting unit such as a hose 28.

The water film type particle impactor 80 defines an impact chamber 81, and the water film type particle impactor 80 has a head 82, an impact surface 83, an air flow inlet 84, an air flow outlet 85, a water flow inlet 86, and a water flow inlet 86. a water outlet outlet 87, a plurality of wall surfaces 88, an air intake means and a flushing means, the wall surfaces 88 surrounding the impact chamber 81, the air flow outlet 85 and the water flow outlet 87 respectively communicating with the impact chamber 81, the spray head 82 A plurality of nozzles 821 are connected to the airflow inlet 84 and the impact chamber 81. The diameters of the nozzles 821 can be, but are not limited to, 1 mm. The impact surface 83 is located in the impact chamber 81 and is formed on one of the wall surfaces 88 and faces the same. The nozzles 821 have a predetermined distance between the impact surface 83 and the nozzles 821. In the embodiment, the predetermined distance is 1 mm. However, one end of the water inlet 86 is formed on the impact surface 83. The position of the water outlet 87 is located below the water film type particle impactor 80, and the position of the air outlet 85 is located above the water film type particle impactor 80.

The air intake means is configured to introduce the airflow of the particles 129/ discharged from the small diameter hole 24 into the impact chamber 81 via the air flow inlet 84 and the nozzles 821, and then discharge the air flow outlet 85. During the flow of the particles 129/ from the gas stream inlet 84 to the gas stream outlet 85, at least a portion of the particles having a larger particle size will be collected by the impact surface 83 due to inertial impact on the impact surface 83. In this embodiment, the The gas means has an air pump or other air pumping device disposed at an upstream end or a downstream end of the water film type particle impactor 80, and the at least partially collected particles are mainly for particles having a particle diameter of more than 500 nm; In the embodiment, the particle size of the particles collected by the impact surface 83 is not limited to 500 nm. For example, the adjustment of the intercept diameter can be achieved by adjusting the distance between the impact surface 83 and the nozzles 821.

The rinsing means is for supplying water to the impact surface 83 via the water inlet 86 and discharging it from the water outlet 87. In the embodiment, the flushing means is provided with a water storage device at the end of the water inlet 86. And a water injection motor or other means for supplying water to the water inlet 86. The water supplied by the rinsing means may be, but not limited to, ultrapure water. The ultrapure water enters the impact chamber 81 from the water inlet 86, and is distributed by the high-speed airflow passing through the nozzles 821. The impact surface 83, then the ultrapure water is subjected to gravity and flows out toward the water outlet 87, and the particles originally located on the impact surface 83 flow out together with the ultrapure water, so that the impact surface 83 can be kept almost The state of the particulate load does not cause a bouncing situation due to the accumulation of particles.

When the powder dispersion system 2 acts, the particles 129 generated by the powder disperser 1 can enter the impact chamber 81 through the air intake means, and the particles having a larger particle size in the air flow are collected by the impact surface 83, and The ultrapure water supplied by the rinsing means is discharged from the water outflow port 87, and the particles having a smaller particle size in the gas stream are discharged from the gas stream outlet 85 along with the gas stream. In other words, the water film type particle impactor 80 can be The particles 129 which are entrained in the gas stream supplied from the upstream end are subjected to a diameter treatment, and the particles having a smaller particle diameter are supplied to the downstream end.

As shown in Fig. 6, in the second embodiment of the present invention, the powder dispersion system 2 provides another water film type particle impactor 90, which is mainly different from the water film type particle impactor 80 in that the water The membrane type particle impactor 90 further has an impact plate 91 disposed on the impact chamber 81. The impact surface 83 is formed on the impact plate 91 and faces the nozzles 821, the water flow inlet 86 and the water flow. The outlets 87 are respectively disposed on two sides of the impact plate 91. The impact surface 83 and the water inlet 86 and the water outlet 87 are respectively provided with two wet recessed porous media 93.

In order to test the efficacy of the powder disperser and powder dispersion system of the present invention, the applicant uses an Aerodynamic particle sizer (APS), a scanning mobility particle sizer (Scanning mobility particle sizer, A sampler (Marple and PENS sampler, hereinafter referred to as MPENS) consisting of a series of multi-stage impact sampler and a personal sampler is used to respectively generate the particles generated by the powder disperser 1 and the powder dispersion system 2 of the first embodiment. The mass concentration distribution and the particle size distribution analysis were carried out, and the assembly manners of the powder disperser 1 and the powder dispersion system 2 with APS, SMPS, and MPENS are as shown in Figs. In the foregoing analysis, the upward flow rate supplied by the suspension means was maintained at 0.3 L/min, and the outlet flow rate of the powder disperser 1 (corresponding to the flow rate of the small diameter hole 24) was maintained at 5.5 L/min, and the particles entered the APS and the SMPS. Before MPENS, the air was further replenished so that the test flow reached 7.3 L/min before the measurement and analysis operation was started. The powder dispersion system 2 was tested in two groups, one of which was the water supply flow rate in the flushing means (Q _w The reaction was carried out under conditions of 0.2 mL/min, and the conditions were carried out under conditions of a Q _w of 1 mL/min. The powder used in the test consists of two types: non-purified carbon nano tube (hereinafter referred to as NPCNT) and purified carbon nano tube (hereinafter referred to as PCNT). The difference is that the latter has surface impurity treatment, the former is not.

First, the figures 9 and 10 respectively show the relationship between the total number concentration of the particles and the time after the NPCNTs and the PCNTs are micronized by the powder disperser 1 and the particles are subjected to the diameter separation treatment by the powder dispersion system 2. The total number concentration is the number concentration measured by the SMPS plus the number concentration measured by the APS, and the measurement time is about 8 hours. The results showed that when the particles 129 produced by the powder disperser 1 were used alone, the total number of NPCNTs and PCNTs was 7331 ± 426 #/cm ³ and 8985 ± 473 #/cm ³ , respectively, and the relative standard deviation was 5.81. % and 5.26%, showing that the concentration of the powder after the powder disperser 1 is micronized, the concentration is quite stable; on the other hand, when the particles generated by the powder dispersion system 2 are tested, different water supply flows (Q) _w ) affects the total number of NPCNTs and PCNTs, where the total number of NPCNTs and PCNTs is 2190±348 #/cm ³ and 3418±965 #/cm ³ , respectively, when Q _w is 0.2 mL/min. The standard deviations were 15.89% and 28.23%. When the Q _w was 1.0 mL/min, the total number of NPCNTs and PCNTs averaged 6340±804 #/cm ³ and 7917±704 #/cm ³ , respectively. The relative standard deviation decreased to 12.68% and 8.89%.

Figures 11 and 12 and Table 1 below show the mass concentration distribution of NPCNT and PCNT measured by MPENS, and the measurement time is about 2 hours. The results showed that when the particles 129 produced by the powder disperser 1 were used alone, the mass concentration distributions of NPCNTs and PCNTs showed a bimodal distribution with a total mass concentration of 1054.04 μg/m 3 and 930.46 μg/m 3 , respectively; When the particles generated by the bulk dispersion system 2 were tested and the Q _w was 0.2 mL/min, the total mass concentrations of NPCNTs and PCNTs were reduced to 41.10 μg/m 3 and 198.61 μg/m 3 , respectively, and when the Q _w was 1 mL/min, NPCNTs were used. The total mass concentration of PCNT and PCNT were 327.67 μg/m3 and 199.58 μg/m3, respectively, and the PCNT exhibited a unimodal distribution.

The foregoing results show that the powder disperser and the powder dispersion system of the present invention can supply a stable concentration of particles, and even under specific operating conditions, it is possible to supply particles having a monotonic distribution of mass concentration, which contributes to the result. Subsequent research is carried out to meet practical needs.

Finally, it should be noted that the constituent elements disclosed in the foregoing embodiments of the present invention are merely illustrative and are not intended to limit the scope of the present invention. Other equivalent substitutions or variations should also be the scope of the patent application of the present application. Covered.

1‧‧‧ powder diffuser

10‧‧‧ powder storage tank

12‧‧‧ powder chamber

125‧‧‧Upper chamber

127‧‧‧ lower chamber

123‧‧‧ bottom side

121‧‧‧ powder

20‧‧‧Micronized components

22‧‧‧ Large diameter hole

24‧‧‧Small hole

26‧‧‧Micropores

30‧‧‧Sipper

32‧‧‧Select channel

40‧‧‧Upstream generating components

401‧‧‧Upstream chamber

403‧‧‧ Vents

413‧‧‧ upper surface

433‧‧‧ upper surface

50‧‧‧Perforated plate

60‧‧‧Porous components

61‧‧‧ bottom side

63‧‧‧ top side

70‧‧‧ gyrotron

71‧‧‧ Fixed Department

73‧‧‧movable department

Claims (14)

A powder disperser comprising: a powder storage tank defining a powder chamber therein for accommodating a plurality of powders; a micronizing element defining a large diameter hole, a small diameter hole and a communication a micro-hole between the large and small diameter holes; a drawing passage communicating between the powder chamber and the micro-hole; a suspending means for suspending the powder in the powder chamber; and a particle a means for supplying a flow of air flowing through the large diameter hole, the micro hole and the small diameter hole in sequence, and sucking the powder suspended in the powder chamber through the extraction channel into the micro hole, and at least partially The powder sucked into the micropores is atomized by a gas flow flowing through the micropores. The powder disperser of claim 1, wherein the suspending means has an upflow generating element disposed on a bottom side of the powder chamber for generating an upward flow in the powder chamber. The powder disperser of claim 2, wherein the upflow generating element has a body and a plurality of columns are radially disposed on a side edge of the body, and the body and the inside of the column define a rise a flow chamber, and the upper surface of the body and the plurality of air columns are provided with a plurality of air outlets, and the air outlets communicate with the upflow chamber and the powder chamber. The powder disperser of claim 3, wherein the suspending means further comprises a perforated plate, the perforated plate is disposed in the powder chamber to divide the powder chamber into an upper chamber and a lower chamber The upper chamber is for accommodating the powder, and the perforated plate is provided with a plurality of perforations, and the upper and lower chambers are connected to each other only by the perforations, and the suspending means is for making the powder The body is suspended in the upper chamber. The powder disperser of claim 4, further comprising a porous member disposed in the powder chamber and adjacent to the bottom of the porous plate, the porous member having a plurality of upflows flowing from a bottom side thereof to A flow channel on the top side, the pore diameter of the flow channels being smaller than the particle diameter of the powders. The powder disperser of claim 4, further comprising a convoluted oscillator having a fixed portion and a movable portion movably disposed on the fixed portion, the powder storage tank being carried by The movable portion. The powder disperser of claim 1, wherein the gas flow supplied by the micronization means has a first gas pressure in the large diameter hole and a second gas pressure in the small diameter hole, the second gas pressure is not greater than the 0.528 times the first gas pressure. The powder disperser of claim 1, wherein the draw channel is orthogonal to the microwell. The powder disperser of claim 1, further comprising a straw disposed in the micronizing element and extending into the powder chamber, wherein the suction channel is defined in the straw. A powder dispersion system comprising: the powder disperser according to any one of claims 1 to 9; and a water film type particle impactor defining an impact chamber, the water film type particle impactor having a a water jet type particle impactor further has an air flow outlet and a water flow outlet respectively communicating with the impact chamber, the spray head having a plurality of nozzles communicating with the air flow inlet and the spray nozzle, an impact surface, an air inlet means and a flushing means a shock chamber located in the impact chamber and facing the nozzles; the air inlet means for introducing the airflow discharged from the small diameter hole into the impact chamber through the airflow inlet and the nozzles, and then The air flow outlet is discharged; the flushing means is for discharging water from the water flow outlet after being supplied to the impact surface. The powder dispersion system of claim 10, wherein the water film type particle impactor has a plurality of wall surfaces surrounding the impact chamber, the impact surface being formed on one of the wall surfaces. The powder dispersion system of claim 11, wherein the water film type particle impactor has a water flow inlet formed on the impact surface, and the rinsing means is configured to supply water to the impact surface via the water flow inlet. The water outlet is discharged. The powder dispersion system of claim 10, wherein the water film type particle impactor further has an impact plate disposed in the impact chamber and having the impact surface. The powder dispersion system according to claim 13, wherein the impact plate has a water flow inlet and the water flow outlet, and the rinsing means is for supplying water to the impact surface through the water flow inlet and discharging the water flow outlet.