Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
LED SOURCE OF UV RADIATION WITH FORCED AIR CIRCULATION
Document Type and Number:
WIPO Patent Application WO/2021/189116
Kind Code:
A1
Abstract:
LED source of UV radiation with forced air circulation is formed in a housing 1 with a parallelepiped shape, on the basis of which is mounted an LED: board 2 with LEDs emitting in the UV spectrum and axially mounted fan 3 for forced ventilation of air through the housing, as longitudinally on the side of the board at an angle of 30° degrees are mounted two reflectors of mirror aluminum 4 and 4 'and on the opposite side is mounted another linear mirror 6 of mirror aluminum with a convex shape, where the outside of the housing is mounted driver 5 with the corresponding power and voltage to which the fan and the UV board are connected in series.

Inventors:
VARGANOV IVO DIMITROV (BG)
VARGANOV BORIS IVOV (BG)
Application Number:
PCT/BG2021/000011
Publication Date:
September 30, 2021
Filing Date:
March 17, 2021
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SECURITY SMART SYSTEMS OOD (BG)
International Classes:
A61L2/10; F21V7/05
Domestic Patent References:
WO2016070006A22016-05-06
Foreign References:
US20080265179A12008-10-30
EP2004554A12008-12-24
EP1893908A12008-03-05
US20200038542A12020-02-06
US9937274B22018-04-10
US20190216958A12019-07-18
Other References:
SONG KAI ET AL: "Microorganisms inactivation by wavelength combinations of ultraviolet light-emitting diodes (UV-LEDs)", SCIENCE OF THE TOTAL ENVIRONMENT, vol. 665, 1 May 2019 (2019-05-01), AMSTERDAM, NL, pages 1103 - 1110, XP055822169, ISSN: 0048-9697, DOI: 10.1016/j.scitotenv.2019.02.041
Attorney, Agent or Firm:
DOBREVA, Rumyana (BG)
Download PDF:
Claims:
Claims

1. LED source of UV radiation with forced air circulation is formed in a housing 1 with a parallelepiped shape, on the basis of which is mounted an LED board 2 with LEDs emitting in the UV spectrum and axially mounted fan 3 for forced ventilation of air through the housing , as longitudinally on the side of the board at an angle of 3Q" degrees are mounted two reflectors of mirror aluminum 4 and 4 'and on the opposite side is mounted another linear mirror 6 of mirror aluminum with a convex shape, where the outside of the housing is mounted driver 5 with thecorresponding power and voltage to which the fan and the UV board are connected in series.

2. Device according to claim 1, characterized in that it is a combination of LEDs with different UV spectrum depending on the type of virus (s) / bacterium (s) or group of ones to be attacked.

3. Device according to claims 1 and 2, characterized in that the LED board contains 75% LEDs emitting UV radiation with a spectrum in the range from 250 to 420 nm and 25% LEDs with a spectrum in the range from 250 to 300 nm.

4; Device according to claims 1 to 3, characterized in that the fan for creating forced ventilation has a power and flow rate corresponding to the desired purification volume.

5. Device according to claim 1, characterized in that the fan and the LEDs are connected in series, the fan being used to limit the current through the LEDs.

6. Device according to Claims 1 and 3, characterized in that an additional UV fluorescent tube with a spectrum of 254 nm in addition to the main UV LEDs is integrated in the device at a higher radiation intensity at high flow rates. \

7. Device according to any one of the preceding claims, characterized in that the housing is cylindrical in shape and a mirror-aluminum cylinder is arranged around the entire inner perimeter (excluding the board (s)) in order to increase the reflection.

Description:
LED SOURCE OF UV RADIATION WITH FORCED AIR CIRCULATION

FIELD OF THE INVENTION

The utility model refers to an LED source ofUV radiation combined with forced ventilation of air through a pipe. The utility model will find application in rooms with bacterial and viral load to drastically reduce the concentration of these organisms:

BACKGROUND OF THE INVENTION

In the past, UV fluorescent lamps were used for this purpose, which ace expensive and relatively short-lived. Usually, due to a number of technical difficulties, no forced ventilation was applied there, but only the energy radiated in space was relied on. In this way, much . less air comes into contact with UV radiation and the time to reduce the bacterial / viral load in the room is many times greater, even impossible.

TECHNICAL ESSENCE OF THE UTILITY MODEL

The task of the present utility model is to create an LED source of UV radiation with forced air circulation with high efficiency of purification of the air in the room from bacteria / viruses with high efficiency of using the radiation itself and a significantly large volume of treated air.

The problem is solved by an LED source of UV radiation mounted in a housing equipped with a reflective system, a fan and a power source. The housing has a special ribbing so that it also serves as a radiator to dissipate the heat released by the LEDs. The housing is in the shape of a square tube at the base of which is mounted an LED board.-!, with 25% of the LEDs emitting in the UV spectrum in the range from 220 to 300nm, but preferably 260 to 280nm, and 75% of the LEDs emitting in the UV spectrum in the range from 250 to 420nm, but preferably from 360 to 400nm. In this way, organisms sensitive to different wavelengths are treated at the same time, without leading to excessive unwanted ionization of the passing air. Longitudinally on the board, at an angle of, for example, 25 to 60, more preferably 25 to 35, and even more preferably 30 °, mirror reflectors are mounted. On the opposite side is mounted another linear mirror of mirrored aluminum with a convex shape, preferably elliptical. In this way, numerous reflections of the emitted UV light are obtained and the air passing through the tube is repeatedly treated with the rays. Thus, with a relatively short length of the device, the fully radiated energy is used.

At one end of the pipe is mounted a fan with appropriate dimensions and flow. It is forced to inject air with a certain flow through the UV rays in order to kill the bacteria / viruses contained in it.

The use of such a fan leads to a relatively fast treatment of almost all the air in the room.

In order to reduce the cost of the product and improve its efficiency and electrical safety, a low-voltage 12VDC fan is used, to which powerful UV LEDs (from 0.2-10W) with different wavelengths (in the range 220-420nm) are connected in series. A standard 24 to 48VDC DC . driver complying with the SELV (Separated Extra Low VOLTAGE) directive is used.

This eliminates the need for an additional driver for the LEDs and its inherent losses.

An exemplary embodiment of the utility model "LED source of UV radiation with forced air circulation" is shown in the attached figures, which explain the utility model without limiting it:

1 housing

2 LED board

3 fan

4, 4 'reflectors 5 driver

6 linear mirror

DESCRIPTION OF THE ATTACHED FIGURES

Fig. 1 LED source of UV radiation with forced air circulation with a purified air flow rata of 200 m 3 / hour.

Fig.2 Simplified electrical diagram of connection of LED source of UV radiation with forced air circulation.

EXAMPLE IMPLEMENTATION OF THE UTILITY MODEL

The following example illustrates the utility model without limiting it:

The main example of the model "LED source of UV radiation with forced air circulation" is a housing 1 with a parallelepiped shape with a length of 600 mm, cross section 120mm / 120mm and flow 230 m 3 / hour, with a radiated power of 20000 mW of LEDs in the UV spectrum, respectively 25% with a spectrum in the range from 260 to 280nm and 75% witha spectrum in the range from 360 to 400nm. In the housing 1 there are two reflectors 4,4 'directed at 30 ° relative to the plane of the LED source 2 and one convex linear mirror 6, located opposite the LED source 2 for multiple reflections and maximum irradiation of the passing bacteria and viruses. A galvanically isolated SELV power supply unit is used, driver 5 to which the forced circulation fan 3 and UV LEDs are connected in series on the LED board, the LEDs being located on the LED board 2. The LED source of UV radiation is installed near the most -the high point of the room (ceiling) to take advantage of the natural air circulation. In this way we will drastically reduce the bacterial / viral background in a room to 300 m 3 .

One of the applications of the utility model "LED source of UV radiation with forced air circulation" is designed for use in large rooms up to 1000m 3 . Then both the fan flow rate, the power of the LED module and the length of the housing are increased to achieve longer exposure to harmful microorganisms. The LED source of UV radiation with forced air circulation is developed with the following range of technical characteristics:

In one of the preferred embodiments of the utility model "LED source of UV radiation with forced air circulation" the housing is made of extruded aluminum profile, which allows the production of products of any length (from 10cm to 300cm) and power (from 5W to 250W).

According to another embodiment of the utility model "LED source of UV radiation with forced air circulation", the board with LEDs contains 75% LEDs with a spectrum of 250- 420nm and 25% LEDs with a spectrum of 250-300 nm. In this way, organisms sensitive to different wavelengths are treated at the same time, without leading to excessive unwanted ionization of the passing air.

In the other embodiment of the utility model "LED source of UV radiation with forced air circulation" the housing has a cylindrical shape and along the entire inner perimeter (excluding the board / boards) is a cylinder of mirrored aluminum to increase the reflection.

In another embodiment of the model "LED source of UV radiation with forced air circulation", when a higher intensity of radiation is required at high flow rates in the device can be integrated and standard UV fluorescent tube with a spectrum of 254nm in addition to the main UV LEDs.

ADVANTAGES of the proposed utility model are the following: • Very low lifetime maintenance costs for the product • Very effective purification of large volumes of air in a relatively short time

• Very efficient use of emitted UV light

• tlsed LEDs: with a life of 50,000 to 100,000 hours and a fan with similar characteristics eliminate the cost of replacing the device.

• High level of- environmental friendliness, thanks to low energy consumption, reduced" maintenance waste and lack of hazardous materials such as mercury, lead and glass, which pose a risk of environmental pollution

• Significant reduction of bacterial and viral load in the premises, contributing to a healthy environment and lower risk of infection.