JP2017096667A - Liquid suction device and liquid suction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for sucking liquid, which allow for sucking just liquid using ultrasonic vibration.SOLUTION: A liquid suction device 10 for sucking liquid comprises a liquid passage unit 12 for liquid to pass, and an ultrasonic vibration imparting unit 14 for imparting ultrasonic vibration to the liquid passage unit 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid suction device and a liquid suction method for sucking a liquid by ultrasonic vibration.

  Conventionally, in order to move the liquid in the water tank to the outside, for example, a method using the negative pressure effect of air is known.

  However, the inventor of the present application has studied the use of ultrasonic vibration as a method other than the above-described methods, and invented a method that can specifically suck a liquid by distinguishing between a liquid and a gas.

JP 2010-2201 A

  In view of the above-described problems, an object of the present invention is to provide a liquid suction device and a liquid suction method that can suck only liquid using ultrasonic vibration.

  1st invention is a liquid suction device which attracts | sucks a liquid, Comprising: It has a liquid passage part which a liquid passes, and an ultrasonic vibration provision part which provides an ultrasonic vibration with respect to the said liquid passage part Features.

  In this case, it is preferable that the ultrasonic vibration applying unit includes a piezoelectric element provided in the liquid passage unit and a high-frequency pulse power source capable of supplying a high-frequency pulse current to the piezoelectric element.

  In particular, the ultrasonic vibration applying unit preferably controls the oscillation frequency so that the liquid passage unit resonates.

  A second invention is a liquid suction method for sucking a liquid, wherein ultrasonic vibration is applied to a liquid passage portion through which the liquid passes, and the liquid passage portion is brought into contact with the liquid to suck the liquid. Features.

  In this case, it is preferable to control the oscillation frequency so that the liquid passage part resonates.

  According to the present invention, it is possible to suck only liquid using ultrasonic vibration.

1 is a conceptual diagram of a liquid suction device according to a first embodiment of the present invention. It is a figure showing the 1st example of the liquid suction device concerning a 1st embodiment of the present invention.

  Next, a liquid suction device and a liquid suction method according to this embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the liquid suction device 10 includes, for example, a liquid passage portion 12 through which liquid passes and an ultrasonic vibration application portion 14 that applies ultrasonic vibration to the liquid passage portion 12. Has been.

  The liquid passage part 12 is a member having a configuration through which liquid can pass, for example. The liquid passage portion 12 preferably has a structure having a hollow portion that communicates with atmospheric pressure so that liquid can pass through, for example. The material, shape, structure, etc. of the liquid passage portion 12 are not limited.

  The ultrasonic vibration applying unit 14 is a member that applies an external force for causing the liquid passing unit 12 to perform ultrasonic vibration. Note that the configuration and principle of applying ultrasonic vibration are not limited.

  Here, when ultrasonic vibration is generated in the liquid passage portion 12 by the ultrasonic vibration applying portion 14, the liquid passage portion 12 is irradiated with ultrasonic waves from the liquid passage portion 12. The ultrasonic vibration is longitudinal vibration.

  In particular, the ultrasonic vibration applying unit 14 preferably adjusts the oscillation frequency so that the liquid passage unit 12 resonates. Thereby, the tip of the liquid passage portion 12 expands and contracts by about 10 μm.

  When the liquid passage portion 12 is ultrasonically vibrated, the pipe friction resistance generated between the liquid passage portion 12 and the liquid L is reduced. Specifically, the liquid passage portion 12 vibrates not only in the longitudinal direction of the liquid passage portion 12 but also in the radial direction, and the actual viscosity resistance between the liquid passage portion 12 and the liquid L is lowered.

  In particular, in the portion of the liquid passage portion 12 that is away from the tip of the liquid passage portion 12, the amplitude of the liquid passage portion 12 is reduced by the amount of attenuation of the ultrasonic vibration, so that the pipe friction resistance is increased. Thereby, the backflow of the liquid in the site | part away from the front-end | tip of the liquid passage part 12 is suppressed. In other words, the more the liquid advances through the liquid passage portion 12, the more effective the backflow of the liquid L is suppressed.

  The definition of “ultrasound” here means a sound having a frequency of approximately 20 kHz or more, and specifically, a concept used to mean a sound having a frequency of 20 kHz or more and 100 kHz or less.

  When ultrasonic waves are applied to a liquid, the sound pressure cycle of the sound waves in the liquid, that is, a high-speed positive / negative pressure is alternately applied to the liquid, and the liquid is instantaneously torn at the time of negative pressure, creating a cavity. Happens. Then, at the next moment, the cavity is compressed and extinguished together with the hydraulic pressure at the positive pressure, and becomes a very strong shock wave and exerts a large pressure on the surroundings. This cavity is cavitation.

At the same time, the ultrasonic waves have a property of reflecting at the interface between substances. For example, the density of the medium [rho, to represent the speed of sound propagating it C, as specific acoustic impedance Z _0, specific acoustic impedance Z ₀ is determined by the [rho × C. When fixed, both ρ and C are large, and as a result, the specific acoustic impedance Z ₀ is also large. The gas Conversely, the specific acoustic impedance Z ₀ becomes smaller.

In general, an ultrasonic wave is reflected at an interface between substances having greatly different specific acoustic impedances Z _{0, and} cannot enter an adjacent phase. For example, ultrasonic waves cannot enter water to air, or vice versa, and are reflected at the interface.

  By utilizing these properties, the ultrasonic wave irradiated in the liquid gives a strong shock wave to the liquid, and the ultrasonic wave that has lost its destination reaches the interface with the liquid passage portion 12 instead of the interface with the air.

  Here, it is possible to induce a so-called capillary phenomenon by the hollow part of the liquid passage part 12, in addition to the synergistic effect of the capillary phenomenon and the energy of the shock wave, the difference in acoustic impedance, the expansion and contraction of the liquid passage part 12, A synergistic effect such as a difference in viscosity resistance of the liquid passage portion 12 overlaps, and a force toward the inlet of the hollow portion of the liquid passage portion 12 acts on the liquid. As a result, the liquid flows from the inlet of the hollow portion of the liquid passage portion 12, flows through the hollow portion of the liquid passage portion 12, and is drained from the outlet.

  On the other hand, in a state where the liquid passage portion 12 is not immersed in the liquid, since the ultrasonic waves are diffused by irradiating the ultrasonic waves into the air, there is almost no air returning to the inlet of the hollow portion of the liquid passage portion 12. In addition, capillary action against air does not occur. For this reason, air cannot be sucked.

  According to the liquid suction device 10 and the liquid suction method according to the present embodiment, it is possible to suck the liquid only by immersing the liquid passage portion 12 that vibrates ultrasonically in the liquid without using the negative pressure of air. Become.

  Here, as a use or application technique of the liquid suction device 10 and the liquid suction method of the present embodiment, it can be applied to, for example, a medical suction device. Specifically, this principle can be applied to a medical suction device to suck only body fluid without damaging surrounding tissues of the body.

  In addition, as a chemical / pharmaceutical application, it is possible to suck only liquid from a medium in which gas and liquid are mixed. As described above, the liquid suction device 10 according to the present embodiment has the property of sucking liquid and not sucking gas, and thus can be applied as a device for separating and transporting only liquid.

(Example)
Next, examples will be described. In the examples, the inventors of the present application experimented to confirm the liquid suction effect.

  As shown in FIG. 2, a tubular member 16 having a relatively small diameter is used as the liquid passage portion 12. For example, a hose or the like can be used.

  A piezoelectric element 18 was used as the ultrasonic vibration applying unit 14 and attached to the tubular member 16. Electrodes 20 are attached to both sides of the piezoelectric element 18. The electrode 20 is connected so that a high-frequency pulse power source 22 can be applied.

  The piezoelectric element 18 has a donut shape, and a tubular member 16 is connected to the inside thereof.

  As the piezoelectric element 18, HEC-1560P4B manufactured by Honda Electronics Co., Ltd. was used.

  As the high-frequency pulse power source 22, a function generator WF 1973 and a high-speed bipolar power source HSA 4101 of NF Circuit Design Block Co., Ltd. were used.

  When a voltage is applied to the electrode 20 from the high-frequency pulse power supply 22, the piezoelectric element 18 repeatedly vibrates and expands and generates ultrasonic waves. The vibration of the piezoelectric element 18 is transmitted to the tubular member 16 and the tubular member 16 vibrates. In particular, when a high-frequency pulse current that is the resonance frequency of the tubular member 16 is passed through the electrode 20, ultrasonic vibration having the maximum amplitude is generated in the tubular member 16. The ultrasonic wave thus generated is irradiated to the liquid in which the piezoelectric element 18 is immersed.

  Ink was used as the liquid L because it was easily visible. Two beakers 24 and 26 were prepared, and ink was put into one beaker 24, and the other beaker 26 was emptied. This was the initial state in the experiment.

  According to this embodiment, when the piezoelectric element 18 is immersed in the liquid L in one beaker 24, ultrasonic waves are applied to the liquid. As a result, it was confirmed that the liquid moved into the tubular member 16 connected to the piezoelectric element 18 and poured into the other beaker 26 through the tubular member 16.

  In addition, the structure which generate | occur | produces an ultrasonic wave is not restricted to the structure of the said Example. For example, a piezo element (a kind of ceramic) that expands or contracts when a voltage is applied is sandwiched between horns made of metal and fixed with bolts or the like. In this configuration, a drive terminal and a ground terminal are provided between the piezoelectric element and the horn, and when an AC voltage is applied to this terminal, the tip of one horn vibrates at high speed. By connecting a tubular member or the like to the tip of the horn, the liquid L can be guided to the tubular member 16.

  In addition, a conventionally known technique can be used in the present invention for a configuration that generates ultrasonic waves.

DESCRIPTION OF SYMBOLS 10 Liquid suction apparatus 12 Liquid passage part 14 Ultrasonic vibration provision part 16 Tubular member 18 Piezoelectric element 20 Electrode 22 High frequency pulse power supply 24 Beaker 26 Beaker L Liquid

Claims (5)

A liquid suction device for sucking liquid,
A liquid passage part through which the liquid passes;
An ultrasonic vibration applying unit that applies ultrasonic vibration to the liquid passage unit;
A liquid suction device comprising:   The liquid according to claim 1, wherein the ultrasonic vibration applying unit includes a piezoelectric element provided in the liquid passage unit, and a high-frequency pulse power source capable of supplying a high-frequency pulse current to the piezoelectric element. Suction device.   The liquid suction device according to claim 1, wherein the ultrasonic vibration applying unit controls an oscillation frequency so that the liquid passage unit resonates. A liquid suction method for sucking liquid,
A liquid suction method in which ultrasonic vibration is applied to a liquid passage portion through which a liquid passes, and the liquid passage portion is brought into contact with the liquid to suck the liquid.   The liquid suction method according to claim 4, wherein the oscillation frequency is controlled so that the liquid passage portion resonates.

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