RU2393582C1 - Device for bactericidical processing of premises - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device includes tubular annular transparent flask filled with discharge gas with mercury vapours, annular magnetic conductor put on the flask with winding connected to power source generating 440 kHz current. Additionally the magnetic conductor features winding used to achieve initial gas ionisation required for discharge, start electrodes are positioned outside the flask, and the flask is made of transparent material retaining radiation in 185 nm wavelength band.

EFFECT: simplified, cheaper device design along with improved reliability, manufacturability and safety.

1 dwg

Description

The invention relates to the field of medical and veterinary technology, namely to gas discharge quartz ultraviolet lamps for sanitary-hygienic processing of air and premises, as well as in technological disinfection systems.

A device for disinfecting indoor air (patent RU No. 2232604, A61L 9/20, A61L 9 / 0.15, published July 20, 2004) is known that uses quartz ozone-forming and ozone-free lamps for bactericidal disinfection of indoor air by pumping this air through closed volume, with the lamps located inside and their separate control.

The specified invention is aimed at the optimal coordination of the requirements of the efficiency of air processing and personnel safety.

The disadvantages of this device are its complexity and the limited life of quartz lamps.

Ozone-free quartz lamp is also known (patent RU No. 2176117, H01J 61/20, H01J 61/40, published on November 20, 2001), the electrodes of which are made in the form of assemblies from a repeatedly twisted spiral, and selectively applied to the outer surface of the lamp bulb transmissive silicon-titanium coating.

The invention is aimed at increasing the power of bactericidal radiation and eliminating the formation of ozone during lamp operation.

The disadvantages of this device are the complexity of its manufacture and inherent in electrode lamps short life.

The closest in technical essence to the claimed device (prototype) is an electrodeless discharge lamp (patent RU No. 2156008, H01J 65/04, H01J 65/00, publ. 09/10/2000), which can be used for bactericidal treatment of premises. The known invention includes a flask in the form of a ring from a quartz tube of circular cross section, forming an annular shape of the inner space filled with a discharge gas containing mercury vapor. The coil of the tube ring passes inside the ring of the magnetic circuit on which the winding is located. The specified winding is connected to an alternating current source.

An alternating electric current of the source with a frequency in the range of 10–200 kHz by means of a winding on an annular magnetic circuit induces an electric field in a coil of discharge gas in a quartz tube.

The lamp is turned on with voltage applied to the starting electrodes in the inner space of the bulb from an additional high-voltage power source and to the magnetic coil from the main power source. A closed plasma cord is formed along the entire length of the inner space of the annular bulb.

Gas ionization can also be achieved by supplementing the device with another external induction coil, a magnetic circuit with a winding connected to an additional energy source.

The known device has the following main disadvantages.

1. The presence inside the flask of additional electrodes for the initial ionization of the gas connected to an external high-voltage source, which reduces the reliability of the device, as well as the presence of the specified high-voltage power source.

In the case of replacing the starting electrodes inside the bulb with an additional external induction coil, as proposed in the prototype, the design of the device is complicated, in addition, a part of the light flux is shielded by the body of the magnetic circuit of the indicated induction coil, and an additional energy source connected to the specified coil is also saved.

2. In the known invention, the frequency at which the plasma generation occurs is limited to a limit of 200 kHz, which is accompanied by a relatively large mass-dimensional characteristics of the induction coil and power source, and also requires a relatively low working pressure of the discharge gas in the lamp bulb.

3. Also a disadvantage of the prototype is ozone formation when used as a device for bactericidal treatment.

The aim of the present invention is to remedy these disadvantages and achieve the following technical result: simplification and cheapening of the design while improving its reliability, manufacturability and safety (environmental friendliness).

The specified technical result in the implementation of the invention is achieved by the following set of essential features.

The inventive device for bactericidal treatment of premises contains a (tubular annular translucent) flask in the form of a tubular ring with an annular inner space filled with a discharge gas including mercury vapor, starting electrodes, an annular magnetically conductive core worn on the flask and containing an induction winding connected to a power source . These signs of the claimed device coincide with the essential features of the prototype.

In the inventive device, the power source supplies the induction winding connected to it with alternating electric current with a frequency of 440 kHz. In addition, the annular magnetically conductive core has an additional winding, through which the initial gas ionization necessary to start the discharge is achieved. Starting electrodes connected to the specified additional induction winding are located outside the space bounded by the bulb, and the tubular annular bulb is made of a translucent material with a coating that does not allow ionizing air radiation with a wavelength in the spectrum of 185 nm.

Distinctive features of the prototype are:

- selection of a higher plasma generation frequency (440 kHz);

- the presence of an additional winding on the ring of the magnetic circuit of the induction coil;

- placement of starting electrodes outside the inner space of the bulb;

- manufacture of a quartz flask of a gas discharge lamp from a translucent material that delays the spectral component of radiation of mercury vapor with a wavelength shorter than 235 nm, causing air ozone formation.

The essence of the invention is illustrated in the drawing, which presents a structural diagram of the inventive device.

The device consists of a bulb 1 in the form of a tubular ring with an annular inner space, an annular magnetically conductive core 2, a power source 3, a main induction winding 4, an additional winding 5, a metal base 6, which functions as a first starting electrode, a wire ring 7, which serves as a second starting electrode.

An annular magnetically conductive core 2 is worn on a tubular annular flask 1 filled with a discharge gas including mercury vapor; the power source 3 is connected to the main induction winding 4, and the starting electrodes 6 and 7 are connected to the additional winding 5.

The device operates as follows. The power source 3 through the main induction winding 4 of the induction coil excites in an annular magnetic core 2 an alternating magnetic field with a frequency of 440 kHz. Under the influence of this field, a high voltage is induced in the additional winding 5, which is applied to the start electrodes 6 and 7. The intensity of the alternating electric field between the start electrodes 6 and 7 ionizes the discharge gas in the bulb 1. Since the annular inner space of the bulb 1 is surrounded by a ring-shaped magnetically conductive core, where the lines of force of the alternating magnetic field are concentrated, the alternating electric field directed along the axis of the bulb 1 leads to an electrical breakdown of the initial ion gas, and then the electric discharge is maintained under the action of an external alternating magnetic field in the annular magnetically conducting core 2. The plasma cord along the length of the inner space of the annular flask 1 is a source of bactericidal disinfecting radiation in the ultraviolet region.

Since the flask 1 is made of a radiation-filtering material, it does not contain the ozone-forming component of the radiation spectrum of the mercury vapor plasma.

Implementation example

The annular flask 1 can be made of a quartz tube with a diameter of 30 mm and a wall thickness of 1.5 mm (Ilmasil, PN-Doped Quartz, PN235). The outer diameter of the toroid is 100 mm, the length of the midline is 210 mm. The discharge gas pressure in the working state is from 2 to 5 Pa.

The magnetic core 2 can be made of ferrite (Epcos) brand N87, R64 × 36 × 15.

The induction winding 4 contains 5 turns, the additional winding 5 contains 50 turns.

The power consumed by the device can be selected equal to 50 watts.

The power supply 3 can be performed on field-effect transistors IRF740 (International Rectifier) and contain at the output a matching device, which is a resonant series circuit composed by a choke and a capacitor, in parallel with which an induction winding is connected 4. In a specific case, the choke can be made on a ring core ( Epcos) K1, R26 / 16 and contain 40 turns of the winding, inductance 50 μH; K78-2.1000 V capacitor, 1.2 nF.

The starting electrode 6, which simultaneously serves as the base of the device, is connected to an additional winding 5, the second end of which is connected to the starting electrode 7, which is a wire ring and located diametrically opposite on the ring-shaped flask 1.

Claims (1)

A device for bactericidal treatment of premises, containing a flask in the form of a tubular ring with an annular inner space filled with a discharge gas including mercury vapor, an annular magnetically conductive core worn on the flask and containing an induction winding connected to a power source, and starting electrodes, characterized in that the power supply supplies the induction winding with alternating electric current with a frequency of 440 kHz, the ring-shaped magnetically conductive core contains an additional bmotku with a number of turns greater than the number of induction coil turns, and connected to the trigger electrodes disposed diametrically opposite to the annular bottom flask and the flask itself is made of a light transmissive material not passing ozone-forming radiation part.