An air purification system and method

Patent metadata

Field	Value
Publication number	US-2023338605-A1
Application number	US-202118015276-A
Country	US
Kind code	A1
Filing date	Jul 7, 2021
Priority date	Jul 7, 2020
Publication date	Oct 26, 2023
Grant date	—

Abstract

The invention relates to the field of air purification, sterilization, disinfection, sanitization, removal of particulate matter and harmful gases. A UV light source( 102 ), which is preferably positioned parallel to the flow of air ensuring continuous disinfection of the airstream due to increased residence time, and a filter ( 106 ) that is preferably positioned surrounding/around the UV source. In an embodiment, the invention is disclosing a self-cleaning ability that is achieved by using electrostatic fields. In another embodiment, a small, compact self-cleaning purifier/device can be used to sanitize small, enclosed spaces like cars, cabins, etc.

First claim

We claim:

1 . An air purification system, for purifying incoming impure air, the system comprising:
a UV source configured to produce irradiation to effect microorganisms; an ionizer configured to emit electrons and thus produce OH radicals using the energy imparted by the UV source and a water source; a filter having an inner surface and an outer surface, configured to trap impurities of the impure air and produce filtered air from the outer surface; wherein the UV source and ionizer are configured to face the inflow of impure air before the impure air reaches the filter.

2 . An air purification system as in claim 1 , wherein the ionizer is configured to emit electrons and thus produce hydrogen peroxide using the energy imparted by the UV source and a water source.

3 . An air purification system as in claim 1 , wherein the water source is the humidity in the air.

4 . An air purification system as in claim 1 , comprising a chemical oxidation system for introducing chemical oxidation agent into the filtered air after the filtration.

5 . An air purification system as in claim 1 , wherein the Ionizer is configured to impart charges on impurities thereby producing conductive and inductive forces for increased filtration by having impurities stick to the filter.

6 . An air purification system as in claim 1 , ionizer configured to generate anions to cause auto-cleaning of the UV source from the dust particles.

7 . An air purification system as in claim 1 , wherein the inner surface of the filter that faces inflow of the air is facing the UV source for in-situ deactivation of microorganism.

8 . An air purification system as in claim 1 , wherein the inner surface of the filter that faces inflow of the air is facing the ionizer.

9 . An air purification system as in claim 1 , wherein the inflow of the impure air is parallel to the surface of the UV source.

10 . An air purification system as in claim 1 , wherein the outer surface of the filter is coated with an adsorbent to trap gases and volatile organic compounds.

11 . An air purification system as in claim 10 , wherein the adsorbent is activated carbon.

12 . An air purification system as in claim 1 , comprising a mesh towards the inner surface of the filter having photocatalyst coating for increased effect on microorganisms.

13 . An air purification system as in claim 1 , comprising: an anti microbial coating on the filter.

14 . An air purification system as in claim 1 , wherein UV source is cylindrical.

15 . An air purification system as in claim 1 , wherein the UV source is configured to irradiate with wavelengths between 100 and 400 nm.

16 . An air purification system as in claim 1 , wherein the filter is cylindrical in shape engulfing said UV source.

17 . An air purification system as in claim 1 , wherein the filter is flat in shape.

18 . An air purification system as in claim 1 , wherein the impure air inlet and the outlet for purified air are configured to allow for batch processing of the air.

19 . An air purification system as in claim 1 , wherein the impure air inlet and the outlet for purified air are configured to allow for continuous processing of the air.

20 . An air purification system, for purifying an incoming impure air, the system comprising:
a housing; an inlet for impure air; an adjustable outlet for purified air; a UV source configured to produce irradiation to effect microorganisms/pathogens; an ionizer configured to generate dense electric field; a filter having an inner surface and an outer surface, configured to trap impurities of the impure air and produce filtered air from the outer surface; wherein the inner surface of the filter facing the incoming impure air also faces the UV source and ionizer thus providing self sterilization/cleaning of the filter.

21 . An air purification system as claimed in claim 20 , wherein the air outlet is configured to allow air flow in opposite direction for inducing self cleaning of the filter using chemical oxidation agent.

22 . An air purification system as claimed in claim 20 , wherein the adjustable outlet is configured to direct air using flaps and blades.

23 . A method for purifying incoming impure air containing impurities, the steps comprising:
Subjecting the impure air to UV source causing inflight deactivation and surface deactivation of microorganisms in the impure air; Subjecting the impurities in the impure air to electrons produced by ionizer, thereby producing conductive and inductive forces for increased filtration by having impurities stick to the filter, and produce OH radicals using the energy imparted by the UV source and a water source, further causing inflight deactivation and surface deactivation of microorganisms in the impure air; Subjecting the impure air to a filter having an inner surface and an outer surface, configured to trap impurities of the impure air and produce filtered air from the outer surface, wherein the directing of air causes impure air to be subject to UV source and ionizer before the impure air reaches the filter.

24 . A method for purifying incoming impure air containing impurities, as claimed in claim 23 , further comprising: directing the air after purification towards a user using a blower.

Assignees

• Indian Inst Technology Bombay

Inventors

• Kaushik Ravi
• Shankaranarayana Mayya Yelia
• Thaokar Rochish

Classifications

• A61L9/205 Primary

  using a photocatalyst or photosensitiser · CPC title

• B01D53/007

  by irradiation · CPC title

• B01D53/885

  Devices in general for catalytic purification of waste gases · CPC title

• B01D46/0028

  provided with antibacterial or antifungal means · CPC title

• B01D46/0032

  using electrostatic forces to remove particles, e.g. electret filters · CPC title