Electrostatic injector

FIELD: ventilation.

SUBSTANCE: electrostatic injector comprises housing with inlet confuser and constant cross-section channel, discharge electrode, collecting electrode, which are connected to high-voltage DC supply and installed in parallel planes perpendicular to longitudinal axis of constant cross-section channel; injector outlet is made in the form of diffuser, the small cross section of which is adjacent to constant cross-section channel, and in diffuser outlet section there installed is grid with regular non-uniformity, to the inner surface of which a catalyst is applied, and guide plates are installed in inner cavity of diffuser, which are uniformly distributed between diffuser walls; at that, surface of the above plates is rough and a catalyst is applied to them.

EFFECT: invention allows controlling ozone concentration at electrostatic injector outlet; and at the same time, high efficiency coefficient and relatively low cost of injector is provided due to its easy manufacture.

 

The invention relates to the field of creation of gas flows and can be used in ventilation and air-conditioning in the premises.

Known electrostatic blowers on patents of the Russian Federation, MPK7 F24F 3/16: №№2121115, 2172898, 2187762, 2304333, 2301377, 2343362, 2109220, 2202741, 2005962, 2181466, 2156169, 2313732, 2202741, 1085, the UK patent No. 2195189, Japan patent No. 7289621, French patent 2578632.

However, as productivity growth supercharger increases the humidity and pollution and increase the formation of ozone, excess levels of which norms is unacceptable in ventilation systems used in confined spaces, in particular, for example, in the habitable compartments of space objects.

There are devices generate ozone with the regulation of the concentration of ozone. Known technical solution according to the patent of Russian Federation №2100272, in which the output of the ozonizer install the sensor ozone concentrations associated Executive body with the power control of the electric discharge in the ozone generator.

Known to the control unit of ozone concentration, where the output of the ozonizer connected to its input by-pass pipe located therein a diaphragm and a back-pressure valve. With proper calculation of the aperture, you can control the output flow rate and ozone concentration (RF patent No. 2372278).

Similarly Khujand is realized pumping with a pump part ozonopause mixture from the output of the ozone generator at its input (RF patent No. 2069169).

Known technical solution according to the patent of Russian Federation №2320932, where the adjustment of the concentration of ozone is carried out by varying the duration of the supply voltage on ozonized electrodes.

The disadvantages of such devices is the loss of performance of the ozone generator, its high cost, increasing energy consumption.

The objective of the invention is to provide regulation of ozone concentration at the outlet of the electrostatic compressor while ensuring high efficiency and relatively low cost of the compressor due to its simplicity.

The task is solved in that the electrostatic compressor, comprising a housing with an input confuser and a channel of constant cross section, discharge electrode, collecting electrode connected to the high voltage DC source and installed in parallel planes perpendicular to the longitudinal axis of the channel of constant cross section, and the output of the compressor is made in the form of a cone, its small cross-section mated with a channel of constant cross section and the outlet section of the diffuser is installed lattice with regular irregularity on the inner surface of which is deposited a catalyst, and in the inner cavity of the diffuser installed the guide plate, evenly spaced between the walls of the cone, the surface of the said place is John made rough and bear the catalyst.

1 shows the construction of the claimed supercharger, where:

1 - body;

2 - input confuser;

3 - channel constant cross section;

4 - bit electrode;

5 - needle;

6 - collecting electrode;

7 - high-voltage DC source;

8 - diffuser;

9 - guide plate;

10 - the catalyst on the guide plates;

11 - lattice with regular irregularity;

12 - the catalyst grids with irregular irregularity.

Electrostatic supercharger includes a housing 1, an input cone 2, a channel of constant cross-section 3, the discharge electrode 4 with the needle 5, the collecting electrode 6, and the bit 4 and the collecting electrodes 6 are installed in a channel of constant cross-section 3 in the housing 1 in planes parallel to each other and perpendicular to the longitudinal axis of symmetry of the channel of constant cross-section 3, and electrically connected to the high voltage constant current source 7 and the diffuser 8 its small cross-section is associated with a channel of constant cross-section 3. In the outlet section of the diffuser 8 is installed lattice with regular irregularity 11, on the inner surface of which is deposited a catalyst 10, and the inner cavity of the diffuser 8 is installed guide plates 9, evenly distributed between the walls of the cone 8, the surface of the above-mentioned plates 9 made of rough who bear the catalyst 12.

The proposed device operates as follows.

Under the influence of a high tension electrostatic field which is formed near conductive surfaces with large curvature (the tip of the needle 4)produce charged particles of air (air ions)which direct high speed towards the collecting electrode 6, pulling the air.

If the flow velocity is small (for air under normal conditions V<100 m/sec), the flow can be considered incompressible and the total pressure remains.

Let Δ - increase of the total pressure during the passage of the interelectrode space, then

Ro=RA+Δ=R Art.+ξ·ρ·(V')2/2,

where: R Art. and V', respectively, the static pressure and velocity in the output of the channel after collecting electrode;

ξ - coefficient of resistance;

ρ - air density;

Pa is the atmospheric pressure.

On the output channel of the static pressure in the flow becomes equal to atmospheric RA.

Then speed to the output side of the channel after collecting electrode 6 V' can be found from the equation:

RA+Δ=RA+ξ·ρ(V')2/2, with V'=√2·Δ/ξ·ρ

Value Δ is determined by the parameters of the electric current that is generated ions, since at constant geometry of electrodes and the magnitude of the summed high voltage setting is moved a certain speed of the ions and their concentration, and, therefore, quite certain value of the discharge current and electric power spent on its creation.

The force acting on the flow from the side of the ions, are completely determined by their speed and concentration, and then increase the total pressure is determined in a first approximation, only the parameters of the electric discharge current.

In case of extension of the output section of the diffuser 8 (see Figure 1) the property is inextricably currents will increase the speed in the constant part of the channel 3 is proportional to the square of the output section with regard to gas-dynamic resistance, increasing the gas flow rate increases, i.e. the efficiency of the supercharger.

Tapering input (input confuser 2) is necessary in order to avoid sharp acceleration of atmospheric air entering the channel of constant cross-section 3, and to prevent the occurrence of separated flow, which will result in the loss of total pressure.

Thus, the introduction of expanding output side (output diffuser 8) allows to increase the efficiency of the proposed electrostatic supercharger compared to superchargers, with only a channel of constant cross-section 3.

Received by the diffuser 8 streams around the guide plate 9, and the flow velocity V' will decrease due to changes in ξ - coefficient with the disobedience and will be determined by the formula:

V'=√2·Δξ·ρ

It was established experimentally that the resistance coefficient ξ can be neglected, if the plate will be installed at an angle of inclination of the thread to 7°.

On the guide plate 9 is applied to the surface roughness, which increases the surface of the deposited catalyst 10, for example activated charcoal or silver, etc. Because the rate of ozone is much lower than the rate charged stream, a significant portion of the ozone will be actively decompose the catalyst 10.

Dripping from the channels formed by the guide plates 9, the flow comes to the lattice with regular irregularity 11, where the flow is aligned, and the catalyst 12 advanced decomposes ozone.

The degree of alignment is a function of the drag coefficient and is determined experimentally.

Electrostatic supercharger, comprising a housing with an input confuser and a channel of constant cross section, discharge electrode, collecting electrode connected to the high voltage DC source and installed in parallel planes perpendicular to the longitudinal axis of the channel of constant cross-section, characterized in that the output of the compressor is made in the form of a cone, its small cross-section mated with a channel of constant cross section and the outlet section of the diffuser is installed grid with regular neravnomerno is d, on the inner surface of which is deposited a catalyst, and in the inner cavity of the diffuser installed the guide plate, evenly spaced between the walls of the cone, the surface of the above-mentioned plates made rough and deposited catalyst.



 

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