TWI463127B - Portable nanoparticle sampler - Google Patents

Description

Portable nano particle sampler

The present invention relates to a particulate sampler, and more particularly to a portable nanoparticle sampler.

Many studies have shown that the nanoparticles inhaled by the human body have an impact on health, and in order to assess the health hazards of the nanoparticles in the workplace for the relevant practitioners, the collection of nanoparticles of different particle sizes and subsequent component analysis is necessary.

There are many samplers available on the market for nanoparticles, including ELPI (Electrical Low-Pressure Impactor), Low Pressure Impactor (LPI), and ten-order micropores. MOUDI (Micro-Orifice Uniform Deposition Impactor) and Nano-MOUDI (Nano Micro-Orifice Uniform Deposition Impactor), but these instruments are not too bulky and heavy, The flow rate and pressure loss during collection are too high to be used with small, portable pumps, so they can only be placed at fixed points for particle collection.

In order to more accurately measure the particle concentration of the actual working area of the practitioner, the applicant of the present application has successfully developed a personal nanoparticle sampler, which is disclosed in US Patent Publication No. 2009/0272202, whose structure is from bottom to top. It is a pre-classifier (20), an acceleration nozzle (nozzle, 30), a particle-sizing filter pack (40), and a final filter (final filter). Pack, 60), the guided airflow is filtered from bottom to top by particle-sizing filter (50) and final filter (70); the designer of the case can collect different particle sizes in two stages. The particles are suitable for small pumps, but the intercept diameter of the split filter paper (50) is related to the gas flow rate there, and the gas flow rate at this place is often affected by the difference in the number of filter holes of the split filter paper (50). The effect is that the intercept diameter and the design value are often slightly offset.

In other words, although the above-mentioned personal nanoparticle sampler has better portability, there is still a problem of accuracy in intercepting the diameter, so how to further develop a nanoparticle sampler with accuracy and portability, Self-disciplined in this case.

The main object of the present invention is to provide a nanoparticle sampler that can combine accuracy and portability.

In order to achieve the above and other objects, the present invention provides a portable nanoparticle sampler comprising a full line air intake cyclone, a microporous impactor located below the tangent intake air cyclone, and a plurality of microporous impactors. a filter paper cassette under the hole impactor; the tangential air inlet cyclone has a cyclone body and an outlet pipe, the cyclone body has an annular portion, a top plate and a bottom plate, wherein the top plate and the bottom plate are respectively disposed on the ring a first chamber is defined between the annular portion, the top plate and the bottom plate, and an air inlet is formed on the annular portion to communicate with the first chamber, and the outlet tube is continuous Provided on the bottom plate and having an inlet and an outlet, the inlet being located in the first chamber and above the air inlet, the outlet tube being for entering the first chamber The gas sequentially exits the tangential inlet cyclone through the inlet and the outlet; the microporous impactor has an impactor body, a nozzle base and an impact plate, and the impactor body defines a second cavity a nozzle base having a plurality of micro-hole nozzles respectively communicating the outlet and the second chamber, the impact plate being located in the second chamber and located directly below the nozzle base; the filter paper defines a first The three chambers have an air guiding passage, an air outlet and a filter paper. The filter paper is disposed in the third chamber to divide the third chamber into a filtering chamber and an outlet chamber. The air guiding channel is It is connected to the second chamber and the filtering chamber, and the air outlet is connected to the outlet chamber.

The portable nanoparticle sampler of the present invention has a low pressure loss by using the outlet airflow of the tangential air inlet cyclone downward and is matched with a microporous impactor, and can be used with a small pump, and second. The respirable Particulate Mass (RPM) collected by the microporous impactor can accurately control the preset diameter without error, which is helpful for subsequent analysis and comparison. Accuracy and portability.

In the following, the structural features of the present invention and the intended effects thereof will be described by a preferred embodiment, but are not intended to limit the scope of the invention as claimed.

Please refer to the first and second figures. In a preferred embodiment of the present invention, a portable nanoparticle sampler includes a tangential flow cyclone 10 and a multi-microporous impact located below the tangent intake cyclone 10. The device 20 and a filter paper cassette 30 located below the microporous impactor 20. In particular, the words "top", "bottom", "high", "upper" and "lower" in this article are based on the portable nanoparticle sampler of the present invention standing on the ground, that is, The relative position in the direction of gravity is correct.

The tangential air intake cyclone 10 has a cyclone body 11 and an outflow pipe 12. The cyclone body 11 has an annular portion 111, a top plate 112 and a bottom plate 113. The top plate 112 and the bottom plate 113 are respectively disposed on A first chamber 114 is defined between the annular portion 111, the top plate 112 and the bottom plate 113, and an air inlet 115 is connected to the first portion 114. The chamber 114 has a direction parallel to the tangential direction of the inner wall of the annular portion 111. In addition, the outlet tube 12 is disposed on the bottom plate 113 and has an inlet 121 and an outlet 122. The inlet The 121 is located in the first chamber 114 and above the air inlet 115, whereby the air flow that the outlet tube 12 can enter the first chamber 114 sequentially exits through the inlet 121 and the outlet 122. The tangential intake cyclone 10; in the present embodiment, the intake port 115 has a square cross section, and the tangential line is 2.1 mm × 2.1 mm when the inlet port 115 has a diameter of 2 L/min. The intake cyclone 10 has a cut diameter of about 4 μm.

In order to facilitate the cleaning of the first chamber 114, the bottom plate 113 can be designed to be detachably coupled to the bottom end of the annular portion 111, and the two can be combined by screwing means or other suitable means; since the outlet tube 12 is disposed on the bottom plate 113, therefore, when the bottom plate 113 and the annular portion 111 are separated from each other, the outlet pipe 12 can also be detached together.

The microporous impactor 20 has an impactor body 21, a nozzle base 22 and an impact plate 23. The impactor body 21 defines a second chamber 24 therein, and the impactor body 21 can be attached thereto. Half 211 and lower half 212 knot The nozzle base 22 can be disposed between the impactor body 21 and the outlet tube 12, and as shown in the third figure, the nozzle base 22 has a plurality of nozzles 221 that respectively communicate with the outlet 122 and The second chamber 24 is located in the second chamber 24 and directly below the nozzle base 22, and a predetermined gap is left between the periphery of the impingement plate 23 and the peripheral wall of the second chamber 24.

In order to reduce the occurrence of particles blocking the wall surface of the nozzle 221, each of the nozzles 221 may be surrounded by a smooth annular wall surface 222 as shown in the fourth figure and has an upper opening 223 and a lower opening 224, the lower opening 224 The aperture is smaller than the upper opening 223. In order to avoid or at least reduce the occurrence of particle bounce, the microporous impactor 20 is further provided with an impact matrix 25 on the top surface of the impact plate 23, and the impact matrix 25 is coated with an oil 251; in order to prevent the oil 251 from being subjected to gas high speed The impact matrix 25 is preferably a Teflon filter paper having a pore size of 10 μm, and has a plurality of filter holes 252 thereon to prevent the diffusion of the eucalyptus oil and enhance the particle bounce prevention effect. However, the impact substrate 25 may not be provided; in addition, in order to facilitate the weighing step after sampling, an aluminum foil 26 or other material carrier sheet may be disposed between the impact substrate 25 and the surface of the impact plate 23, and may be combined after sampling. The aluminum foil 26, the impact substrate 25, the eucalyptus oil 251 thereon, and the collected particles are collectively weighed.

Wherein, if the diameter of the lower opening 224 of the nozzle 221 is W, the distance from the lower opening 224 to the top surface of the impact plate 23 is S (since the surface of the impact substrate 25 is regarded as the extension of the top surface of the impact plate 23, and the oil 251 is subjected to the high-speed airflow. The impact is diffused and flattened on the surface of the impact substrate 25, so in the present embodiment, the distance from the top surface of the impact substrate 25 to the lower opening 224 is S), and the number of nozzles 221 is 137, for example, when the S/W ratio is When it is 13.8, the diameter of the microporous impactor 20 is about Particles of 100 nm, that is, particles having a particle diameter of 100 nm to 4 μm, are collected by the microporous impactor 20; wherein the intercept diameter of the microporous impactor 20 can be accurately controlled by changing the S/W ratio , practically not limited to 100 nm.

In addition, in order to make the distribution of the particles relatively uniform, the microporous impactor 20 may further have a fixing plate 27 and a motor 28, both of which are located in the second chamber 24, and the fixing plate 27 is the second cavity. The chamber 24 is divided into an upper chamber 241 and a lower chamber 242. The fixing plate 27 has a shaft hole 271 and a U-shaped flow guiding hole 272 communicating with the upper and lower chambers 241 and 242. The motor 28 has a rotating shaft 281. The shock hole 23 is connected to the impact plate 23 and is synchronously rotatably connected to the impact plate 23, and the impact plate 23 and the motor 28 are respectively located in the upper and lower chambers 241 and 242. When the motor 28 rotates the shaft 281, the impact plate 23 is It can be rotated together and its rotation speed can be set at 1 rpm, so that the particle distribution is more uniform on the impact matrix 25, which effectively reduces the bounce of the particles due to concentration in a certain number of positions.

The filter paper cassette 30 defines a third chamber 31 therein, and the filter paper cassette 30 further has an air guiding passage 32, an air outlet 33 and a filter paper 34. The filter paper 34 is disposed in the third chamber 31. The third chamber 31 is divided into a filtering chamber 311 and an outlet chamber 312, and the filter paper 34 is used to collect the remaining particles (in this embodiment, particles having a particle diameter of less than 100 nm). The passage 32 is connected to the lower chamber 242 of the second chamber 24 and the filter chamber 311. The air outlet 33 is connected to the outlet chamber 312, and the air outlet 33 is connected to the air pump. The pipe fittings are connected, and the pumping pump is portable, for example, a portable high-pressure loss pump (XR5000, SKC Inc., PA, USA) developed by SKC, and its length, width and height are respectively 8 cm × 6 cm × 10 cm, weighing about 1054 g (with battery), its size and weight are easy for users to carry around; in addition, in order to The flow rate of the airflow from the second chamber 24 into the third chamber 31 is increased, and the bottom of the second chamber 24 may be tapered, but may not be provided.

In addition, the portable nanoparticle sampler of the present invention may also include a plurality of fixing rods 40 for holding the tangent intake cyclone 10 and the filter paper cassette 30 in the direction of the microporous impactor 20.

Please refer to the fifth picture. In use, the air is pumped by the air pump, so that the air flow enters the first chamber 114 from the air inlet 115 of the tangential air intake cyclone 10, and the air flow first acts along the annular portion 111 due to gravity and inertia. The wall flows downward spirally, so that the larger particles are swept toward the wall due to inertia and settle on the bottom plate 113; when the air flows to the bottom plate 113, it then spirals upward along the outer wall of the outlet pipe 12, Finally, the tangential intake cyclone 10 is sequentially exited through the inlet 121 and the outlet 122 of the outlet pipe 12; in the embodiment, the tangential inlet cyclone has a diameter of about 4 μm; the airflow then flows through the The nozzle 221 flows and turns along the gap between the impact plate 23 and the impactor body 21, and at this time, the particles having larger particles collide with the impact plate 23 due to inertia and are collected by the impact substrate 25 and the oil 251 thereon; In the present embodiment, the microporous impactor 20 has a cut-out diameter of about 100 nm; finally, the airflow enters the third chamber 31 via the air guide passage 32, so that particles having a particle diameter of 100 nm or less are collected by the filter paper 34. , the clean air flow continues to leave the filter paper by the air outlet 33匣30.

After the appropriate time, the sampling is stopped, and the impact substrate 25 is taken out together with the aluminum foil 26 and the oyster sauce 251, and the weight of the particles (respirable particles) having a particle diameter of 4 μm to 100 nm is calculated, and the filter paper 34 is taken out and weighed. , calculate the particle size of 100nm The weight of the following particles (nanoparticles) was used to evaluate the exposure of the worker's respirable particles and nanoparticles during the sampling.

With the special design in the foregoing embodiments, the nano particle sampler provided by the invention is not only lightweight and portable, but also has a high-precision intercept diameter for the tangential air inlet cyclone, the microporous impactor and the filter paper respectively. .

In particular, there is a significant difference between the tangential inlet cyclone and the conventional tangential inlet cyclone in this case, that the direction of the output airflow is different; in order to effectively separate the particles from the airflow, whether it is revealed in textbooks or practice Conventional tangential air intake cyclones, the airflow of which is an upward output (as shown in the patent application No. 2009/0272202), and the tangential air intake cyclone for the upward output airflow has been a field in the field for a long time. Technical bias, and the input airflow required for the microporous impactor should be reversed in the opposite direction; due to such innately incompatible characteristics, tangential air intake cyclones and micropores have not been seen in the past. The particle sampler used in combination with the impactor. However, the inventor of the present invention found that if the direction of the output airflow of the tangential air inlet cyclone is changed under appropriate design, the effect of separating the particles can be achieved, and the microporous impactor can be combined and become lower. The second-order particle separation mechanism for pressure loss is well suited for use in the field of portable nanoparticle samplers that are highly portable, thereby achieving accurate and convenient particle sampling operations.

The above description is only a preferred embodiment of the present invention, and those skilled in the art can still make structurally simple replacements or changes, such as changing the intercept diameter of each stage mechanism or connecting the mechanisms by other means, or The U-shaped diversion hole of the fixed plate is changed to other shapes or further subdivided into a plurality of guide holes to connect the upper and lower chambers, and any such modification or retouching that is made in the spirit of the present case should still be It belongs to the scope of the invention intended to be protected.

10‧‧‧ Tangential air intake cyclone

11‧‧‧Cyclone body

111‧‧‧Rings

112‧‧‧ top board

113‧‧‧floor

114‧‧‧First chamber

115‧‧‧air inlet

12‧‧‧Exhaust pipe

121‧‧‧ entrance

122‧‧‧Export

20‧‧‧Microporous impactor

21‧‧‧ Impactor body

211‧‧‧ upper half

212‧‧‧ Lower half

241‧‧‧Upper chamber

242‧‧‧ lower chamber

25‧‧‧ Impact matrix

251‧‧‧矽 oil

252‧‧‧filter holes

26‧‧‧Aluminum foil

27‧‧‧ Fixed plate

271‧‧‧Axis hole

272‧‧‧Inlet

28‧‧‧Motor

281‧‧‧ shaft

30‧‧‧Filter paper匣

31‧‧‧ third chamber

311‧‧‧Filter chamber

22‧‧‧Nozzle base

221‧‧‧ nozzle

222‧‧‧Ring wall

223‧‧‧Opening

224‧‧‧ opening

23‧‧‧ impact board

24‧‧‧Second chamber

312‧‧‧Outlet chamber

32‧‧‧air conduction channel

33‧‧‧ air outlet

34‧‧‧ filter paper

40‧‧‧Fixed rod

W‧‧‧ caliber

S‧‧‧ distance

The first drawing is an exploded view of a preferred embodiment of the invention.

The second drawing is a cross-sectional view of a preferred embodiment of the invention.

The third figure is a top view of the nozzle base of the present invention.

The fourth drawing is a partial cross-sectional enlarged view of the nozzle base and the impact plate of the present invention.

Figure 5 is a schematic view showing the state of use of the preferred embodiment of the present invention.

10‧‧‧ Tangential air intake cyclone

11‧‧‧Cyclone body

111‧‧‧Rings

112‧‧‧ top board

113‧‧‧floor

114‧‧‧First chamber

115‧‧‧air inlet

12‧‧‧Exhaust pipe

121‧‧‧ entrance

122‧‧‧Export

20‧‧‧Microporous impactor

21‧‧‧ Impactor body

211‧‧‧ upper half

212‧‧‧ Lower half

22‧‧‧Nozzle base

221‧‧‧ nozzle

23‧‧‧ impact board

24‧‧‧Second chamber

241‧‧‧Upper chamber

242‧‧‧ lower chamber

27‧‧‧ Fixed plate

272‧‧‧Inlet

28‧‧‧Motor

281‧‧‧ shaft

30‧‧‧Filter paper匣

31‧‧‧ third chamber

311‧‧‧Filter chamber

312‧‧‧Outlet chamber

32‧‧‧air conduction channel

33‧‧‧ air outlet

34‧‧‧ filter paper

40‧‧‧Fixed rod

Claims (6)

A portable nano particle sampler includes: a tangential flow cyclone having a cyclone body and an outflow pipe, the cyclone body having an annular portion, a top plate and a bottom plate The top plate and the bottom plate are respectively disposed on the upper and lower sides of the annular portion, and a first chamber is defined between the annular portion, the top plate and the bottom plate, and an air inlet is formed on the annular portion to communicate with the a first chamber, the outlet tube is disposed on the bottom plate and has an inlet and an outlet, the inlet is located in the first chamber and above the air inlet, and the outlet tube is for entering the first chamber The airflow of the chamber sequentially exits the tangential air inlet cyclone through the inlet and the outlet; a microporous impactor located below the tangential inlet air circulator has an impactor body, a nozzle base and a An impact plate, the impactor body defining a second chamber, the nozzle base having a plurality of nozzles respectively communicating the outlet and the second chamber, the impact plate being located in the second chamber and located at the nozzle base Directly below; a filter located below the microporous impactor The paper cassette defines a third chamber and has an air guiding passage, an air outlet and a filter paper. The filter paper is disposed in the third chamber to divide the third chamber into a filtering chamber and an outlet chamber. The air guiding passage is connected to the second chamber and the filtering chamber, and the air outlet is connected to the outlet chamber; wherein the microporous impactor has an impact matrix disposed on the top surface of the impact plate. The impact substrate is a Teflon filter paper, and the impact substrate is coated with eucalyptus oil, and a bearing sheet is further disposed between the impact substrate and the surface of the impact plate. The portable nanoparticle sampler of claim 1, wherein the bottom plate of the cyclone body is detachably coupled to the bottom end of the annular portion. The portable nanoparticle sampler according to claim 1, wherein the microporous hole The impactor further has a fixed plate and a motor, both of which are located in the second chamber. The fixed plate divides the second chamber into an upper chamber and a lower chamber. The fixed plate has a shaft hole and at least one guide. The flow holes communicate with the upper and lower chambers, and the motor has a rotating shaft extending through the shaft hole and connected to the impact plate in a synchronous manner, and the impact plate and the motor are respectively located in the upper and lower chambers. The portable nanoparticle sampler of claim 1, wherein the bottom of the second chamber is tapered. The portable nanoparticle sampler of claim 1, wherein the carrier sheet is an aluminum foil. The portable nanoparticle sampler of claim 1, wherein each of the nozzles is surrounded by a smooth annular wall and has an upper opening and a lower opening, the lower opening having a smaller diameter than the upper opening.