• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    System agitator and diffuser of a gas in liquids comprising a rotary axis, driven by a variable speed drive system at will and one or more blades attached to the rotating shaft. The cross section of the blades is an aerodynamic profile and its angle of attack is variable. A plurality of circular holes and predetermined diameter are distributed along the span of the blades and pneumatically connected to a pressurized gas supply equipment. In each section, the location of the holes is the one with the greatest favorable pressure gradients. The variation of the angle of attack, gas flow rate and rotation speed of the blades allows to control the frequency of generation and the diameter of the bubbles. In this way the surface/volume ratio of the microbubbles can be controlled by increasing the efficiency in the mass transfer from gas to liquid. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2662693A1
    申请号:ES201600854
    申请日:2016-10-03
    公开日:2018-04-09
    发明作者:José Manuel Gordillo Arias de Saavedra；Álvaro EVANGELIO SÁNCHEZ；Enrique Jesús SÁNCHEZ QUINTERO
    申请人:Universidad de Sevilla；
    IPC主号:
    专利说明:

    image 1 DESCRIPTION
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    Examples of this type of membrane diffusers are described in US Patent 2010224541 A 1, which discloses a device for generating "fine" bubbles by means of a submerged membrane, or in US 2014158618, which also discloses a diffuser device by means of a membrane and the application of a pulsating pressure to the gas.
    Regarding the process of diffusion of a gas in a liquid, the scientific article published in 2015 in the "Journal of Fluid Mechanics", entitled "Pressure Gradient Induced Generation of Microbubbles", and of which two of its authors are co-inventors of the present invention, discloses the importance of pressure gradients in the processes of microbubble generation from the formation of gas meniscus. One of the most relevant conclusions of this article is that the greater the favorable pressure gradient at the point of bubble formation, the smaller its diameter and the greater its frequency of formation.
    The technical problems to be solved with the development of the present invention are the following:
    • Obtain a device that can operate as a stirrer and as a diffuser simultaneously.
    • Introduce a gas in a liquid using gas bubbles of micrometric size, whose diameter can be controlled.
    • Improve energy efficiency in diffusion and agitation processes. Description of the invention
    The agitator and diffuser device of a gas in a liquid, which is the object of the present invention, is one of those devices comprising one or more blades immersed in a liquid that has a relative speed with respect to the blades. Said relative speed can be generated by moving the blades by means of a motor drive device with adjustable speed at will mechanically coupled to said blades, or by a device that moves the liquid with a speed adjustable at will and the blades being fixed to a structure. Each cross section of the blades is an aerodynamic profile that, as is well known, generates strong favorable pressure gradients in the region near the leading edge when operating at moderate angles of attack, between 0 ° and 15 °
    35 typically.
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    Based on what is disclosed in the scientific article cited in the "Background of the invention" section on the role of the pressure gradient in the generation of microbubbles, it is foreseen that:
    • the cross section of each of the blades is an aerodynamic profile;
    • the angle of attack of each of the blades is adjustable at will by means of a turning mechanism coupled to one or more blades;
    • the relative speed of the liquid with respect to the blades is variable at will;
    • a plurality of holes of approximately circular shape and diameter between 10 microns and 10 millimeters are distributed along the wingspan of each of the blades, said holes are intended to introduce a predetermined flow of gas into a liquid;
    • each hole is located in the region that, containing the leading edge, is comprised between the backwater point and the suction peak of the aerodynamic profile that constitutes the cross section of the blade to which said hole belongs;
    • said holes are pneumatically connected to a pressurized gas supply equipment, whose flow rate is variable at will.
    As can easily be deduced from the previous features of the invention and taking into account the results set forth in the scientific article "Pressure Gradient Induced Generation of Microbubbles", cited in the "Background of the invention" section, the controlled variation of the angle of attack of the blades and of the relative speed of the liquid with respect to the blades, allows to control the value of the pressure gradient that is generated at the exit of the holes; In addition, the value of the supplied air flow can also be controlled. Thanks to the control of these three variables (gas flow, angle of attack and relative velocity liquid-blade), both the diameter and the frequency of generation of the microbubbles can be controlled.
    By being able, for a given gas flow rate, to reduce the diameter of the microbubbles by increasing the frequency of production, the surface / volume ratio of the introduced gas is increased and therefore the efficiency in the transfer of mass of gas to the liquid increases.
    image6
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    In other words, for a mass transfer of gas to a given liquid, it is required
    less injected gas flow, which means a clear saving.
    Another competitive advantage of the present invention is that derived from the use of aerodynamic profiles on the blades. These generate less resistance in their movement within a liquid than any other profile that is being used in the existing agitators so that the energy necessary to move the blades inside the fluid is reduced, which is totally necessary in the processes stirring Brief description of the figures
    Figure 1: shows a perspective view of a scheme of a preferred embodiment of the agitator and diffuser device of a gas in a liquid.
    Figure 2: shows a perspective view of a blade and the arrangement of the holes in it. Embodiment of the invention
    Figures 1 and 2 show a preferred embodiment of the agitator and diffuser device of a gas in a liquid (1), which is the object of the present description, and which comprises:
    • a rotating shaft (3),
    • a variable speed drive device at will that drives said rotary axis,
    • two blades (2),
    • two clamping shafts (4) that mechanically connect the blades to the rotating shaft (3).
    Where the above elements have the following characteristics:
    • the cross section of each of the blades is an aerodynamic profile;
    • the angle of attack of each of the blades is adjustable at will by means of a turning mechanism coupled to one or more blades;
    • a plurality of holes (5) of approximately circular shape and predetermined diameter are arranged that are distributed along the wingspan of each of the blades. The function of these holes is to introduce a predetermined flow of gas into a liquid;
    image8
    image9
    • the diameter of the holes is in a range from 10 microns
    up to 10 millimeters;
    • each hole is locatedintheregion that, containing the leading edge, is
    find understood between the point ofbackwaterand the profile suction peak
    aerodynamic which constitutes the cross section of the blade to which it belongs
    said hole;
    • said holes are pneumatically connected witha supply team of
    gas toPressure,whoseflowisvariabletowill preferablythrough
    pipes arranged inside each of the blades, the clamping shafts and the
    rotary axis or through channels arranged inside the blades, the axes of
    clamping and rotary shaft and tightly connected to each other.
    The position of the holes is determined as follows: the aerodynamic profile to be used is selected as well as the operating attack angles. Next, it is determined for each section of the blade, by numerical or experimental calculation methods, the position of the backwater points, which are the points of maximum pressure, and of the suction peaks, or points of minimum pressure. In each section, the region that, containing the leading edge, is between the backwater point and the suction peak is the one with the greatest favorable pressure gradients. That is why it is in this region, hereinafter region of interest, where the holes are placed. However, since said region depends on the angle of attack, the point at which the hole is located must be the one that remains in the region of interest for any range of operating attack angles. For each section, among all the points that remain in the region of interest for the range of operating attack angles, the one with the greatest favorable pressure gradients should be chosen. For example, it has been found that for a straight blade, with a NACA0012 profile and operating at an angle of attack [-12, 12) degrees, a suitable position of the holes is the leading edge, as shown in Figure 2 .
    In order to adapt the agitator and diffuser device of a gas in a liquid to different fluids, processes and sizes of the tanks, the following design options are contemplated that affect the type of relative movement of the blades with respect to the liquid:
    • that the length of the clamping axes is adjustable at will,
    • that each one of the axes of subjection of the blades has an alternative movement of translation along the rotary axis by means of a second motive device of speed adjustable at will and
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    • that the rotary axis has a translation movement by means of a third speed drive device 5 adjustable at will.
    The agitator and diffuser device of a gas in a liquid is applicable in different
    sectors, among which we can mention: the treatment of wastewater or residential water, the
    mixing of liquids, homogenization of liquids stored in tanks, processes
    10 chemicals, fish farming, the manufacture of alcoholic beverages and soft drinks and the processes of suspension, dispersion, or heat transfer, which can take advantage of greater efficiency in the diffusion of a gas in a liquid and the agitation of the same liquid .
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    权利要求:
    Claims (10)
    [1]
    image 1
    1. Agitator and diffuser device of a gas in liquids, of those comprising one or more blades immersed in a liquid and in which said liquid has a relative speed with respect to the blades, characterized in that:
    • the cross section of each of the blades is an aerodynamic profile;
    • the angle of attack of each of the blades is adjustable at will by means of a turning mechanism coupled to one or more blades;
    • the relative speed of the liquid with respect to each of the blades is variable at will;
    • a plurality of holes of approximately circular shape and diameter between 1 micron and 10 millimeters are distributed along the wingspan of each of the blades. Said holes are intended to introduce a predetermined flow of gas into a liquid;
    • each hole is located in the region that, containing the leading edge, is comprised between the backwater point and the suction peak of the aerodynamic profile that constitutes the cross section of the blade to which said hole belongs;
    • said holes are pneumatically connected to a pressurized gas supply equipment, whose flow rate is variable at will.
    [2]
    2. Agitator and diffuser device of a gas in a liquid, according to claim 1, characterized in that each of the blades is fixed to a structure and the relative velocity of the liquid with respect to said fixed blades is generated by a device that moves said liquid with an adjustable speed at will.
    [3]
    3. Agitator and diffuser device of a gas in a liquid, according to claim 1, characterized in that the relative velocity of the liquid with respect to the blades is generated by the movement of the blades by means of a motor drive device of adjustable speed at will mechanically coupled thereto.
    [4]
    Four. Agitator and diffuser device of a gas in a liquid, according to claim 3, characterized in that said blades are connected by means of their corresponding axes of attachment to a rotating shaft driven by a driving device of adjustable speed at will.
    [5]
    5. Agitator and diffuser device of a gas in a liquid, according to claim 4, characterized in that the length of the clamping axes is adjustable at will.
    [6]
    6. Agitator and diffuser device of a gas in a liquid, according to claim 4 or 5, characterized in that each of the axes of attachment of the blades has an alternative movement of movement along the rotary axis by means of a second driving device of adjustable speed to Will.
    [7]
    7. Agitator and diffuser device of a gas in a liquid, according to any of claims 4-6, characterized in that the rotary axis has a translation movement by means of a third driving device of adjustable speed at will.
    [8]
    8. Agitator and diffuser device of a gas in a liquid, according to any of claims 3 -7, characterized in that the relative speed of the liquid with respect to the structure to which the blades are attached, is adjustable at will.
    [9]
    9. Stirring device and diffuser of a gas in a liquid, according to any of claims 2 -8, characterized in that the connection of the holes of each of the blades with the gas supply equipment under pressure is carried out by means of waterproof conduits arranged inside of each of the blades, the clamping axes and the rotary axis.
    [10]
    10. Agitator and diffuser device of a gas in a liquid, according to any of claims 2 -8, characterized in that the connection of the holes of each of the blades with the gas supply equipment under pressure is carried out by means of channels arranged inside the blades, the clamping axes and the rotary axis and tightly connected to each other.
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    同族专利:
    公开号 | 公开日
    ES2662693B2|2018-10-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB1336372A|1970-04-27|1973-11-07|Union Carbide Corp|Method and apparatus for sparging gas into liquid|
    US4371480A|1978-04-12|1983-02-01|Noordvos Schroeven B.V.|Propeller for distributing a gaseous, powdered or liquid material in a liquid|
    EP0015050A1|1979-01-29|1980-09-03|General Signal Corporation|Fluids mixing apparatus|
    JPS63310628A|1987-02-21|1988-12-19|Masashi Tsuchida|Propeller type transportation device|
    DE4104621A1|1991-02-15|1992-08-20|Abs Pumpen Ag|Propeller for stirring, mixing or pumping fluids - comprises blades fitted with pipes via which gas or powder can be mixed with fluid being agitated|ES2738225A1|2018-07-20|2020-01-20|Univ Sevilla|Agitator and gas diffuser system in liquids and liquids in other immiscible liquids |
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201600854A|ES2662693B2|2016-10-03|2016-10-03|Agitator and diffuser system of a gas in liquids|ES201600854A| ES2662693B2|2016-10-03|2016-10-03|Agitator and diffuser system of a gas in liquids|
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