Patents by Inventor Chuen Jinn Tsai
Chuen Jinn Tsai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8136416Abstract: A personal nanoparticle sampler is disclosed to include a pre-classifier, a nozzle, a connector and a final filter pack. The connector and the final filter pack respectively accommodate a particle-sizing filter and a final filter to collect nanoparticles smaller than a diameter. The pre-classifier removes large particles to avoid clogging of the connector. The nozzle raises the airflow velocity to reduce the cut-off diameter of the particle-sizing filter without increasing the total flowrate, allowing the personal nanoparticle sampler to be used with a personal sampling pump.Type: GrantFiled: October 6, 2008Date of Patent: March 20, 2012Assignee: Institution of Occupational Safety and HealthInventors: Shi-Nian Uang, Tung-Sheng Shih, Chuen-Jinn Tsai, Cheng-Han Wu
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Publication number: 20110209528Abstract: A nozzle plate containing multiple micro-orifices for the cascade impactor and a method for manufacturing the same are disclosed. The nozzle plate is formed by a series of semiconductor processes, including lithography, etching and electroplating. The nozzle plate comprises a plate body and a plurality of micro-orifices formed on the plate body. The orifice has a diameter which gradually expands in the direction away from the bottom of the plate body to achieve a smooth inner surface, allowing particles to pass therethrough smoothly without being clogged in the nozzle plate.Type: ApplicationFiled: July 22, 2010Publication date: September 1, 2011Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventors: Chuen-Jinn Tsai, Sheng-Chieh Chen, Hong-Dar Chen
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Patent number: 7934542Abstract: This invention is a tube bundle heat exchanger for thermophoretic deposition of aerosol particles. It has a housing with an internal chamber, and several cold and hot tubes. The cold and hot tubes are arranged in a staggered manner in the internal chamber of the housing. Low and high temperature fluids flow inside the cold and hot tubes, respectively. When the exhaust gas passes through the chamber, temperature gradient between the cold and hot tubes causes aerosol particles suspended in the exhaust gas to deposit on the surface of cold tubes to achieve the treatment of exhaust gas. Staggered arrangement of cold and hot tubes can maintain nearly constant temperature gradient in the direction of the gas flow thereby enhances the overall removal efficiency of particles.Type: GrantFiled: February 27, 2009Date of Patent: May 3, 2011Assignee: National Chiao Tung UniversityInventors: Chuen-Jinn Tsai, Shih-Hsuan Huang, Chih-Liang Chien
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Publication number: 20110090611Abstract: A particle charger with sheath air flow for enhancing charging efficiency includes a housing and a discharge wire. The housing has a charging chamber for accommodating the discharge wire, a particle inlet, a sheath air inlet, an outlet and an accelerating channel. A clean sheath air is guided through the sheath air inlet into the charging chamber to surround charged particles, reducing deposition of charged particles on the inside wall of the housing. A relatively small annular gap of accelerating channel accelerates the charged particles to exit the particle charger, and therefore minimized the particle electrostatic loss due to depositing on the inner surface of the housing. Additionally, uncharged particles approach the discharge wire axially, and charged particles move away radially. It is helpful for the charged particles to diffuse rapidly and uniformly, thereby enhancing the charging efficiency.Type: ApplicationFiled: December 29, 2009Publication date: April 21, 2011Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventors: Chuen-Jinn Tsai, Lin Guan-Yu, Chen Hui-Lin
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Publication number: 20110057335Abstract: A venturi scrubber which avoids clogging in the throat by dust particles is developed. The scrubber includes a venturi tube, two scrubbing fluid conduits and a storage tank. The venturi tube has a converging section, a diverging section and a throat section which is connected between the converging section and the diverging section. The scrubbing fluid conduit has a top end connected with the bottom end of the converging section of the venturi tube, and a bottom end extending into the storage tank. Thereby, scrubbing fluid can be guided directly into the storage tank without passing through the throat section. As a result, the clogging of dust particles on the converging section of the venturi throat can be minimized and the abnormal increase in the pressure drop of the air flow through the throat can also be avoided.Type: ApplicationFiled: May 11, 2010Publication date: March 10, 2011Applicant: NATIONAL CHIAO TUNG UNIVERSITYInventor: Chuen-Jinn Tsai
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Publication number: 20110056375Abstract: A wet electrostatic precipitator (ESP) is disclosed to have a housing, several discharge wires, two roughened collection electrodes coated with TiO2 or SiO2 nanoparticles, two porous metallic plates, and two roughened glass plates coated with TiO2 or SiO2 nanoparticles. The porous metallic plates and the glass plates coated with TiO2 or SiO2 nanoparticles located above the collection electrodes are used to enhance the uniformity of the water film. When particles are introduced into the ESP, they are charged by gas ions generated by corona discharge, and then migrate to collection electrodes due to electrostatic force. Finally, particles are removed by uniform water film flowing downward along the collection electrodes. Furthermore, pulse jet passing through the small holes on the collection plates is used to clean discharge wires, maintaining electric corona strength and prolonging the operation life.Type: ApplicationFiled: December 17, 2009Publication date: March 10, 2011Applicant: National Chiao Tung UniversityInventors: Chuen-Jinn Tsai, Guan-Yu Lin
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Patent number: 7833324Abstract: A wet electrostatic precipitator is disclosed to include a condensation-growth chamber, a precipitation chamber connecting with the condensation-growth chamber, three dual-sleeve members mounted in the precipitation chamber, three discharge electrodes connecting with the dual-sleeve members, two insulating members covering on the inner surface of the precipitation chamber, and two ground electrodes mounted on the outside of the precipitation chamber. Thus, a uniform water film is formed on the surface of the insulating members to wash away the particles from waste gas. The condensation-growth chamber is provided for the particles to grow therein and thereby enhances the collection efficiency. The insulating member acts as a shield between the discharge electrodes and the ground electrodes and thereby avoids a short circuit or sparks.Type: GrantFiled: November 14, 2008Date of Patent: November 16, 2010Assignee: Industrial Technology Research InstituteInventors: Tzu-Mimg Chen, Shou-Nan Li, Chuen-Jinn Tsai, Sheng-Jen Yu, Guan-Yu Lin
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Publication number: 20100116476Abstract: This invention is a tube bundle heat exchanger for thermophoretic deposition of aerosol particles. It has a housing with an internal chamber, and several cold and hot tubes. The cold and hot tubes are arranged in a staggered manner in the internal chamber of the housing. Low and high temperature fluids flow inside the cold and hot tubes, respectively. When the exhaust gas passes through the chamber, temperature gradient between the cold and hot tubes causes aerosol particles suspended in the exhaust gas to deposit on the surface of cold tubes to achieve the treatment of exhaust gas. Staggered arrangement of cold and hot tubes can maintain nearly constant temperature gradient in the direction of the gas flow thereby enhances the overall removal efficiency of particles.Type: ApplicationFiled: February 27, 2009Publication date: May 13, 2010Applicant: National Chiao Tung UniversityInventors: Chuen-Jinn TSAI, Shih-Hsuan Huang, Chih-Liang Chien
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Publication number: 20090314162Abstract: A wet electrostatic precipitator is disclosed to include a condensation-growth chamber, a precipitation chamber connecting with the condensation-growth chamber, three dual-sleeve members mounted in the precipitation chamber, three discharge electrodes connecting with the dual-sleeve members, two insulating members covering on the inner surface of the precipitation chamber, and two ground electrodes mounted on the outside of the precipitation chamber. Thus, a uniform water film is formed on the surface of the insulating members to wash away the particles from waste gas. The condensation-growth chamber is provided for the particles to grow therein and thereby enhances the collection efficiency. The insulating member acts as a shield between the discharge electrodes and the ground electrodes and thereby avoids a short circuit or sparks.Type: ApplicationFiled: November 14, 2008Publication date: December 24, 2009Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Tzu-Mimg CHEN, Shou-Nan Li, Chuen-Jinn Tsai, Sheng-Jen Yu, Guan-Yu Lin
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Publication number: 20090272202Abstract: A personal nanoparticle sampler is disclosed to include a pre-classifier, a nozzle, a particle-sizing filter pack and a final filter pack. The particle-sizing filter pack and the final filter pack respectively accommodate a particle-sizing filter and a final filter to collect nanoparticles smaller than a diameter. The pre-classifier removes large particles to avoid clogging of the particle-sizing filter pack. The nozzle raises the airflow velocity to reduce the cut-off diameter of the particle-sizing filter without increasing the total flowrate, allowing the personal nanoparticle sampler to be used with a personal sampling pump.Type: ApplicationFiled: October 6, 2008Publication date: November 5, 2009Applicant: Institute of Occupational Safety and HealthInventors: Shi-Nian UANG, Tung-Sheng Shih, Chuen-Jinn Tsai, Cheng-Han Wu
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Patent number: 7537629Abstract: A porous metal denuder has a cascade impactor to collect aerosol particles of different diameters, two porous metal discs downstream to collect basic and acidic gases, respectively, and a final filter to collect particles smaller than the cut diameter of the last stage of the cascade impactor which will penetrate the two porous metal discs.Type: GrantFiled: March 24, 2006Date of Patent: May 26, 2009Assignee: Institute of Occupational Safety and Health, Council of Labor AffairsInventors: Tung-Sheng Shih, Chuen-Jinn Tsai, Cheng-Hsiung Huang
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Publication number: 20090095161Abstract: A porous metal denuder has a cascade impactor to collect aerosol particles of different diameters, two porous metal discs downstream to collect basic and acidic gases, respectively, and a final filter to collect particles smaller than the cut diameter of the last stage of the cascade impactor which will penetrate the two porous metal discs.Type: ApplicationFiled: March 24, 2006Publication date: April 16, 2009Applicant: Institute of Occupational Safety and Health, Council of Labor AffairsInventors: Tung-Sheng Shih, Chuen-Jinn Tsai, Cheng-Hsiung Huang
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Patent number: 7458284Abstract: A three-stage dust sampler makes use of a porous foam as the impactor substrates. The sampler includes an annular inlet which conforms to ISO/CEN/ACGIH inhalable sampling criteria, two impactor stages to classify thoracic and respirable particles and a final filter to collect respirable particles after the impactors. For 100 ppi polymer foam substrates, and a flow rate of 3.2 lpm, the collection efficiency curves of the thoracic and respirable dust matches ISO/CEN/ACGIH criteria when the jet-to-plate distance is 1.0. The cut-off aerodynamic diameter is 9.6 and 4.0 ?m for the first and second impactor stages, respectively, and ?{square root over (stk50)} is 0.39 for both stages. The collection efficiencies for solid particles is equal to that for liquid particles, indicating that there is no solid particle bouncing from the foam substrates.Type: GrantFiled: October 3, 2006Date of Patent: December 2, 2008Assignee: Institute of Occupational Safety and Health, Council of Labor AffairsInventors: Tung-Sheng Shih, Da-Toung Tang, Chuen-Jinn Tsai, Cheng-Sheng Chang
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Publication number: 20080175763Abstract: A method for treating waste gas containing acid and/or base, employing fine spray-scrubbing technology for treating the waste gas mentioned above, wherein the scrubbing solution is atomized to generate mists with droplet size of 1 to 100 ?m. Another feature of the present invention is to combine the application of surfactant in wet scrubbing technology for treating waste gas containing acids, bases, or both, especially, in a low concentration. Another feature of the present invention is to combine spray tower and/or packed tower and/or other scrubbers vertically/horizontally to get enhanced performance of the conventional control systems.Type: ApplicationFiled: March 26, 2008Publication date: July 24, 2008Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Hung Min Chein, Hsin-Hsien Wu, Shankar Gopala Aggarwal, Chuen-Jinn Tsai
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Publication number: 20080134894Abstract: This invention provides a high-efficiency parallel plate wet denuder (PPWD) for gas absorption, the absorption surfaces thereof are composed of two hydrophilic porous glass plates on which TiO2 particles are coated and subsequently are irradiated with UV light to form super-hydrophilic surfaces, so that it further enhances the formation of uniform water film and increases gas absorption efficiency. This invention can be used in the manual sampling devices for acidic/basic gases, the gas absorption equipments for acidic/basic gases and gas-particle denuder sampling devices, besides it can also be coupled with an ion chromatograph to make semi-continuous acidic/basic gas-particle monitors.Type: ApplicationFiled: February 20, 2007Publication date: June 12, 2008Applicant: National Chiao Tung UniversityInventors: Chuen-Jinn Tsai, Guan-Yu Lin
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Publication number: 20070269349Abstract: A three-stage dust sampler makes use of a porous foam as the impactor substrates. The sampler includes an annular inlet which conforms to ISO/CEN/ACGIH inhalable sampling criteria, two impactor stages to classify thoracic and respirable particles and a final filter to collect respirable particles after the impactors. For 100 ppi polymer foam substrates, and a flow rate of 3.2 lpm, the collection efficiency curves of the thoracic and respirable dust matches ISO/CEN/ACGIH criteria when the jet-to-plate distance is 1.0. The cut-off aerodynamic diameter is 9.6 and 4.0 ?m for the first and second impactor stages, respectively, and ?{square root over (stk50)} is 0.39 for both stages. The collection efficiencies for solid particles is equal to that for liquid particles, indicating that there is no solid particle bouncing from the foam substrates.Type: ApplicationFiled: October 3, 2006Publication date: November 22, 2007Applicant: Institute of Occupational Safety and Health, Council of Labor AffairsInventors: Tung-Sheng Shih, Da-Toung Tang, Chuen-Jinn Tsai, Cheng-Sheng Chang
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Patent number: 6969420Abstract: A cyclone is used to collect nanoparticles and is formed of a chamber, and a guide wing located in the chamber such that the guide wing and the chamber form a passage. A flow entraining the nanoparticles is moved through the passage in such a way that the flow is caused to spin rapidly, and that the nanoparticles, acted on by a centrifugal force, are thereby resulting in collision with the chamber wall. The cyclone has a nanoparticle cut-off aerodynamic diameter, which is reduced by virtue of the phenomena that the particle inertia increases in a low pressure environment, and that the particle slipping correction factor increases under low pressure, and that the rebound of the particle in the cyclone chamber tends to alleviate under low pressure. The cyclone is used to remove nanoparticles from industrial exhaust fumes.Type: GrantFiled: December 4, 2003Date of Patent: November 29, 2005Assignee: Industrial Technology Research InstituteInventors: Hung-Min Chien, Yu-Du Hsu, Chuen Jinn Tsai
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Publication number: 20050053536Abstract: A method for treating waste gas containing acid and/or base, employing fine spray-scrubbing technology for treating the waste gas mentioned above, wherein the scrubbing solution is atomized to generate mists with droplet size of 1 to 100 ?m. Another feature of the present invention is to combine the application of surfactant in wet scrubbing technology for treating waste gas containing acids, bases, or both, especially, in a low concentration. Another feature of the present invention is to combine spray tower and/or packed tower and/or other scrubbers vertically/horizontally to get enhanced performance of the conventional control systems.Type: ApplicationFiled: May 28, 2004Publication date: March 10, 2005Inventors: Hung Chein, Hsin-Hsien Wu, Shankar Aggarwal, Chuen-Jinn Tsai
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Publication number: 20040261622Abstract: A porous denuder system includes: a sample inlet, which is a hollow tube and has a first connecting element at its top, external end; a particle sorter comprising one or a plurality of annular sorters, the sorter located in the sample inlet and one of its ends being pushing against an inside of the top end of the sample inlet; a porous collecting element being made of a porous material; and a sampling body which is a hollow tube and has a first connecting element at its external top end for connecting to the first connecting element at the sample inlet external top end, and a stopper at its bottom end for pushing against the porous absorbing element so the porous absorbing element is placed between the particle sorter and the stopper, and the stopper has a through hole or a through tube at its center for connecting to an external part.Type: ApplicationFiled: June 1, 2004Publication date: December 30, 2004Applicant: Institute of Occupational Safety and Health, Council of Labor Affairs, ExecutiveInventors: Tung-Sheng Shih, Chuen-Jinn Tsai, Cheng-Hsiung Huang
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Patent number: 5146244Abstract: A purging air flow system that causes air to pass over a pyrometer lens or window to keep it clean and free from particulate contaminants has an annular, continuous slot for air inlet around the periphery of the lens to permit flow of air across the lens without any obstructions in the path of flow inwardly from the outer edge of the lens. An asymmetric flow pattern is established across the lens surface, either by having a differential size slot at different peripheral portions of the peripheral edge of the lens or window, or by providing a radial swirl about the axis of the window so that when the air goes through the slot, the tangential velocity creates a moving asymmetric flow pattern on the window surface.Type: GrantFiled: January 23, 1990Date of Patent: September 8, 1992Assignee: Rosemount Inc.Inventors: Douglas C. Myhre, Richard J. O'Brien, David Y. H. Pui, Chuen-Jinn Tsai