RU2796956C1 - Device for supplying gas to liquid - Google Patents

Abstract

FIELD: precision instrumentation.

SUBSTANCE: device can be used for supplying air to the aquatic environment to maintain the life of aquatic organisms. The device for supplying gas to a liquid contains an air chamber with a gas supply pipe, equipped with a valve mounted on the air chamber; an electric current conductor installed inside the air chamber; a generator of a series of electric current pulses regulated in amplitude, duration and repetition frequency, installed outside the air chamber and connected to an electric current conductor with the possibility of electric current impulses passing through this conductor.

EFFECT: increased reliability of the device, a significant reduction in the level of noise and vibration due to the absence of mechanical moving parts.

1 cl, 2 dwg, 1 ex

Description

Technical field

The claimed invention relates to the field of precision instrumentation and can be used in devices for enrichment with gas or gas-air mixture of various liquids. It is possible to use a device for supplying air to the aquatic environment to support the life of aquatic organisms. Due to the absence of mechanical moving parts, it can be especially useful in biological environments that require minimal vibration and noise, as well as high accuracy in dosing the gas-air mixture into the liquid.

State of the art

From the prior art, a device is known that implements a method of gassing a liquid, which provides for the injection (injection, injection) of gas into a liquid during the recirculation of the latter and the supply of a gas-liquid flow to the mirror surface of the gassed liquid, gas injection is carried out between two unidirectional and converging liquid flows, at a speed of the latter from 10 up to 100 m/s (SU 1250241). The device contains a container with a circulation circuit, a mixer and an injector with a nozzle installed in the upper part of the container, while the injector is equipped with an additional nozzle installed coaxially to the main one, also connected to the pressure pipeline of the circulation circuit.

The known device is characterized by a narrow scope and does not provide the possibility of high-precision dosing of the gas supply to the liquid.

A device for dispersing a gas into a liquid is known, comprising a receiving chamber, a mixing chamber and a diffuser. The device is provided with means for spraying liquid, made in the form of a pneumatic centrifugal nozzle with a spray chamber at the outlet, an axial channel and a peripheral channel for gas supply, formed by the nozzle body and a central spring-loaded fairing, while the fairing has an axial channel that communicates with the receiving chamber (RU 2085272).

The disadvantages of this device are also the low accuracy of dosing the gas supply to the liquid, and, in addition, the need to use mechanical, including rotational, external sources of variable uncontrolled pressure, which increases the noise level during operation of the device and reduces its reliability.

A device that implements a method for introducing gases into a liquid is known. The method includes ejection (the process of mixing any two media (in this case, gas and liquid), in which one medium, being under pressure, affects the other and entrains it) of gas from a pointed pipe having a confuser-diffuser nozzle, the formation of a gas flow having a supersonic initial jet velocity during ejection from a pointed pipe, creating a flame shell around the gas flow to convert the gas flow into a coherent gas flow having a supersonic initial axial jet velocity, passing a coherent gas flow from a pointed pipe to the surface of the liquid volume, contacting the surface liquid volume with a coherent gas flow and gas transmission into the liquid volume (RU 2208749).

The disadvantage of this technical solution is that the implementation of the known method requires a device characterized by high structural complexity, multi-element. In this case, the device is used in the mode of supersonic gas flow, leading to the appearance of a flame, therefore, it is possible to accumulate thermal energy, the dissipation of which is not provided by the device. As a result of heating the structure of the device, its failure may occur. In addition, this device is characterized by the following disadvantages - increased noise during operation, the inability to ensure the accuracy of dosing the gas supply to the liquid, as well as the narrow scope of the device.

The closest in technical essence and adopted for the prototype of the technical solution is the device described in A.S. USSR No. 1736584 B01F3/04 B01F5/04 C02F1/24. The method of dispersing gas in a liquid and a device for its implementation / Pavlechko V.N., Shcherbakov L.A. Published 05/30/1992. This device for supplying gas (and dispersing gas in a liquid) contains an air chamber equipped with a gas supply pipe with a throttle, as well as a confuser installed in the air chamber, a mixing section in the form of a rectangular slot channel with a height of 0.5 - 5.0 mm, made with holes on the wide sides, and a diffuser.

The disadvantage of this device is also the impossibility of ensuring the accuracy of dosing the gas supply to the liquid, the narrow scope of the device, increased noise and vibration during its operation, and, in addition, a high probability of cavitation in the device, as a result of which the device may fail.

Thus, the technical problem solved by the claimed invention is the need to overcome the disadvantages inherent in analogues and the prototype, by creating a simple and reliable device for supplying gas (air) to a liquid with the possibility of use in various industries, characterized by low noise during operation. .

Brief summary of the invention

The technical result achieved by using the claimed invention, increasing the accuracy of gas supply dosing as a result of an unambiguous relationship between the volume of displaced gas, proportional to the value of the integral of the function of pressure versus time P(t), to the parameters of the current pulse.

Other technical advantages of the proposed solution also lie in a significant reduction in the level of noise and vibration during operation due to the absence of mechanical movement of parts during operation of the device.

The claimed technical result is achieved by the fact that in a device containing an air chamber with a gas supply pipe, the air chamber is equipped with a valve configured to open and close when the pressure inside the air chamber changes, an electric current conductor installed inside the air chamber, a generator of a series of adjustable amplitude , duration and repetition rate of electric current pulses installed outside the air chamber and connected to an electric current conductor with the possibility of electric current impulses passing through this conductor.

In the proposed device for supplying gas to a liquid, the change in gas pressure in the air chamber is carried out as a result of the passage of electric current pulses in a conductor located in the air chamber. The increase in gas pressure due to the flow of electric current in the conductor inside the air chamber causes the volume of air to be pushed out, that is, it moves (supply) from the air chamber to the container with liquid.

Brief description of the drawings

The essence of the claimed invention is illustrated by the following images, where

in fig. 1 shows a diagram of the proposed device,

figure 2 shows a typical experimental dependence of air pressure P in the working air chamber on time t for a conductor made of nickel alloy when exposed to a current pulse with duration Δ t = 5.7 s and amplitude I = 0.5A.

Positions in the drawings indicate:

building 1,

gas supply pipe 2,

tip 3,

electrical conductor 4,

source (generator) of electric current (pulse current) 5,

valve 6,

container 7 with liquid 8.

Implementation of the invention

The device includes a body 1 equipped with a gas supply pipe 2 with a tip 3. The internal volume of the body 1 with a valve 6 and a gas supply pipe 2 with a tip 3 form the air chamber of the device. The valve 6 is installed in the housing wall and can be made, for example, from elastic materials. The valve has an inlet that closes or opens under pressure inside the air chamber. In other words, the valve is designed to shut off or vice versa, to provide air access to the air chamber of the device. The tip 3 is made with the possibility of immersion in an externally located container 7, for example, filled with water 8 (figure 1). A metal conductor 4 is placed in the air chamber with the possibility of connecting to an electric current source 5. For example, copper wires can be used as such conductors from the current source to the housing, and a nickel alloy wire can be used inside the air chamber. The effect of a rapid change in pressure during the passage of small amplitude current pulses in a nickel alloy conductor is more significant when small diameter conductors are selected. As a source of electric current 5, an electric current pulse generator with adjustable amplitude and pulse duration is used.

The claimed device works as follows.

At the beginning of the experiment, atmospheric air pressure was set in the air chamber. Electric current generator (pulse current) 5 generates a series of electric current pulses adjustable in amplitude, duration and frequency. With the passage of current in the electric conductor 4, the pressure in the volume of the air chamber increases rapidly, the valve 6 closes, and part of the air through the gas supply pipe 2 and the tip 3 is pushed into the liquid 8 in the vessel 7 (Fig.1). After the release of air into the liquid in the air chamber during the action of an electric current pulse, the air is partially rarefied. After the end of the current pulse and the exit of part of the air from the air chamber, the pressure in the air chamber quickly decreases, valve 6 opens and air is sucked from the outside into the air chamber, as a result of which the volume of outside air necessary to equalize the pressure to atmospheric pressure enters the air chamber for the next stage of gas-to-liquid supply. Thus, the air pressure in the air chamber and the outside (atmospheric) pressure are equalized. With the passage of the next pulse of electric current in the conductor, the process is repeated.

The volume of gas displaced through the nozzle is proportional to the value of the integral P(t) during the action of the current pulse and, therefore, depends on the amplitude and duration of the current pulse. The amplitude and / or duration of the current pulse required to displace the required volume of air is also determined by the depth of fixation of the tip in the liquid, since it is necessary to overcome the pressure of the liquid, which depends on the depth of tip immersion. Changing the parameters of the current pulse (amplitude, duration) allows you to control with sufficient accuracy the volume of gas (air) supplied to the liquid (water).

In the proposed device, the change in gas (air) pressure in the working air chamber, which moves part of the air from the air chamber, is carried out by passing electric current pulses in the conductor located in the air chamber.

With the passage of an electric current pulse of a certain magnitude and duration in the conductor, the graph of the pressure change in the air chamber of the device over time has three characteristic sections (figure 2). In the initial section, the pressure of the gas (air) increases sharply, there is a pressure jump. Then the pressure builds up much more slowly. When the current is turned off (at the end of the passage of the electrical impulse), the pressure drops sharply.

Example of a specific implementation

As an experimental implementation, a working layout of the proposed device was made. The air chamber was formed by a glass tube with a diameter of 8 mm, sealed at the ends, with an outlet and a valve made of an elastic material. The conductor located inside the glass tube is made of a nickel alloy with a diameter of 100 μm, and outside the tube body it is made of copper. Figure 2 shows a typical experimental dependence of air pressure P in the air chamber on time t for a conductor with a diameter of 100 μm from a nickel alloy when exposed to a current pulse with a duration of Δ t = 5.7 s and an amplitude of I = 0.5A.

The device can be used for enrichment with gas, gas-air mixture of liquids. It is possible to use a device for supplying air to the aquatic environment to maintain the life of aquatic organisms, microorganisms. Due to the absence of mechanical moving parts, the reliability of the device, a significant reduction in the level of noise and vibration during its operation, increases. A particularly useful application of the device may be its use in biological fluid environments that require minimal vibration and noise, as well as accurate dosing of gas to liquid.

Claims (1)

A device for supplying gas to a liquid, containing an air chamber with a gas supply pipe, characterized in that the air chamber is equipped with a valve configured to open and close when the pressure inside the air chamber changes, an electric current conductor installed inside the air chamber, a generator of a series of adjustable amplitude, duration and repetition rate of electric current pulses installed outside the air chamber and connected to an electric current conductor with the possibility of electric current impulses passing through this conductor.

Images