JP2014018641A - Air cleaner by cavitation bubbled water stream - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaner of air polluted by bad smell or harmful components.SOLUTION: A mild swirling flow is generated in a cylindrical cyclone chamber by a discharge fan in the degree of a household ventilation fan, while a strong suction fan is required in a cyclone dust collector, and a cavitation bubble nozzle is faced to an upper part in the cyclone chamber, and a microbubble-involving waterdrop group sprayed from the nozzle is dispersed into the swirling air flow. Hereby, bad smell/harmful components in the air falling down slowly and spirally are captured by the waterdrop group, and oxidized/decomposed by extinction of microbubble.

Description

  The present invention relates to an air purification apparatus that adsorbs and decomposes volatile organic compounds, bad odor components, vaporized oily components, and the like in the atmosphere with a group of water droplets containing microbubbles.

Microbubbles work.
A method of generating cavitation bubbles by irradiating the fluid flowing in the cylinder 2 with ultrasonic waves 4 is disclosed in US Pat. No. 7,718,073, and is shown in FIG. Microbubble bubbles having a particle size of 50 or less are generated from the emitter 3 to improve bubble generation efficiency. According to the publication, column 4, line 55 to column 5, line 23, “According to the present invention, the micro organic structure can be removed by radicals H.OH and HOO. These radicals are harmful to the micro organic structure. The reaction of the following formula is caused in an oxygen atmosphere by high-frequency ultrasound (ultrasound).
H ₂ O → H. +. OH
H. + O ₂ → HOO.
HOO. + HOO. → H ₂ O ₂ + O ₂
. OH +. OH → H ₂ O ₂
The energy required for the production of these radicals and the like decreases with the use of microbubbles. This is because the microbubbles are superimposed on cavitation-ion bubbles formed by ultrasonic waves, thereby increasing the fluorescence phenomenon. This fluorescent phenomenon increases radical species. That is, when passing through the ultrasonic wave 4, the microbubbles 5 are fragmented and the fluorescence phenomenon becomes active. In particular, when a plurality of ultrasonic wave transmission sources are arranged in the microbubble passage, crushing becomes more active. "

  In order to generate microbubbles in water, the cavitation method is more energy-saving than the method of chopping bubbles, as described in the previous section, and is employed in an air purification device as a cavitation bubble nozzle (Japanese Patent Laid-Open No. 2011-581). , Japanese Patent Application No. 2011-176281).

Cyclone dust collectors Cyclone dust collectors that do not require filters are in widespread use. The intake pipe 2 faces in the upper tangential direction of the cylindrical cyclone chamber, and is sucked and exhausted from the exhaust pipe 4 (FIG. 5—Japanese Patent Laid-Open No. 2008-29769). The dust airflow 100 sucked into the cylinder 3 in the tangential direction through the intake pipe 2 descends as a swirl airflow along the inner wall surface of the cylinder 3, reaches the bottom partition 10, rises in reverse, and is discharged from the exhaust pipe 4. The The dust is pressed against the wall surface of the cylinder 3 by the centrifugal force at the time of turning, and accumulates in the bottom partition wall 10 by gravity. In the present invention, a water droplet flow containing an antibacterial agent is mixed with the swirling airflow through the induction tube 9, dust is captured by the water droplet group, and is stored in the bottom partition 10 as a dust aggregate 300. Sterilizes and deodorizes aggregates by antibacterial action.

  In order to capture volatile organic compounds and organic resin paints from a paint gun with microbubble water droplets, a swirling counterflow region is generated by the upward airflow in the cylinder and the downward spraying waterdrop (JP, A, JP) 2011-581). In the parallel flow method that is not counterflow, the processing path must be long (Japanese Patent Application No. 2011-176181). We focused on the cyclone air cleaning method to deodorize and clean organic resin paint-free light airflow with low fan capacity.

  A cavitation bubble nozzle with a turbulent flow region with a rapidly expanding path cross section is used to grow cavitation bubble nuclei generated in the turbulent flow region, and microbubbles (50 to 2 μm) in a jet that depressurizes by touching the atmosphere from the tip nozzle Grow this bubble. This cavitation bubble nozzle faces downward in the upper part of the cylindrical cyclone chamber. In order to extend the contact time of the water droplets sprayed from the nozzle with the air flow to be deodorized and purified, an air inlet is arranged at the top of the cyclone chamber and the air inside the cyclone chamber is discharged. A discharge port is arranged, and the airflow sucked into the cyclone chamber from the upper introduction port is slowly swung along the inner peripheral wall surface. The scattered water droplets contained in the microbubbles descend slowly along with the swirling airflow, trapping off-odor components, volatile compounds, etc. in the airflow by the water droplets and decomposing by the disappearance of the microbubbles.

  The airflow descending while slowly swirling in the cyclone chamber contacts the sprayed water droplet group containing the microbubbles. Most of the volatile compounds and off-flavor components in the airflow are adsorbed by the water droplet group. These adsorbed substances are decomposed by hydroxyl radicals or the like when the microbubbles disappear. Water droplets in the swirling airflow tend to adhere to the wall surface due to weak centrifugal force. In particular, if a constricted part is provided at the lower part of the cyclone chamber, the water droplet group adheres to the wall surface by further centrifugal force. Unlike a cyclone dust collector, there is no need for a powerful suction fan, and it is characterized by sucking airflow with a home ventilation fan.

  It is sectional drawing of a cyclone chamber.   It is sectional drawing of a cavitation bubble nozzle.   It is explanatory drawing of the Example which has arrange | positioned the scattering plate which decomposes | disassembles the microbubble jet from a cavitation bubble nozzle into a submicron bubble scattering flow.   It is a particle size distribution graph of the submicron bubble in the Example of FIG.   It is explanatory drawing of the cyclone dust collector currently disclosed by Unexamined-Japanese-Patent No. 2008-29769, The sprayed antibacterial water droplet is staying in the cyclone chamber bottom part.   It is explanatory drawing of the well-known technique which produces | generates the cavitation bubble of US Patent 7,718,073 by an ultrasonic wave.

  A cavitation bubble nozzle 2 having a turbulent flow region 11 in which the path cross section rapidly expands is employed (FIG. 2). The circulating water flow at the tap water pressure passes through the flow path 10 and generates cavitation bubbles in the turbulent flow region 11. This cavitation bubble passes through the bubble growth channel 12, and is diffused and sprayed through a well-known deflector 13 that sprays a water flow in a fan curtain shape. The bubble particle size distribution in the sprayed water droplet flow has a peak characteristic at 10 to 20 μm (micron) and a peak at around 2 μm. The deflector 13 is removed, and a scattering plate 14 having an uneven surface is placed at a position about 10 cm away from the nozzle tip (FIG. 3). The water stream containing cavitation bubbles receives an impact force on this uneven surface and violently scatters in all directions as fine water droplets. The bubble particle size distribution of the scattered water droplet group is shown in FIG. The peak characteristic of 10 to 20 μm is halved, and the peak of 2 μm protrudes accordingly. It can be interpreted that 10 to 20 μm bubbles were shredded to 2 μm upon receiving impact energy. In addition, considering that the bubble diameter measuring instrument used cannot detect submicron (1 μm or less), there is a high possibility of generating a large amount of submicron bubbles of 1 μm or less. In fact, ozone odor is felt near the scattered water droplets, causing discoloration of the organic coating material. Let us guess the generation of free radicals such as hydroxyl groups.

This cavitation bubble nozzle 2 is caused to face downward in the upper part of the cylindrical cyclone chamber 1 (FIG. 1). Circulating water accumulated at the bottom of the outer wall cylinder 4 is circulated to the cavitation bubble nozzle 2 by the pump 6. A water pressure of about 4 kg is applied to the nozzle 2, and a group of water droplets containing microbubbles is sprayed in a fan curtain shape through the deflector 13.
An air inflow pipe 3 that guides air containing a strange odor component or a harmful substance is allowed to face the upper portion of the cylindrical cyclone chamber 1. It is preferable to have the end face in the tangential direction of the cylinder. The lower part of the cylindrical cyclone chamber 1 is tapered. In order to forcibly discharge the air in the cyclone chamber 1 from the lower discharge port, the airflow flowing into the chamber 1 from the air inflow pipe 3 descends while swirling, but the swirling flow increases the flow velocity along the tapered inner wall surface. Therefore, the swirl flow in the cyclone chamber 1 becomes more active. Also, the vortex flow rapidly increases as the water in the wash basin approaches the bottom plug, and the vortex here causes a slow vortex throughout the wash basin. Along with the swirling airflow that descends while slowly swirling in the cylindrical cyclone chamber 1, the spray water droplet group also descends slowly, adsorbing the off-flavor components and volatile / evaporated substances in the airflow. When the microbubbles in the water droplets disappear, free radical species such as hydroxyl radicals are generated to oxidize or decompose these adsorbed substances. Free radical generation in an oxygen atmosphere. Produces hydrogen peroxide and ozone. These strong oxidizing powers oxidize volatile organic compounds in paint factories, formaldehyde contained in new home building materials, machine oil evaporated during lathe operations, and off-flavors in food factories.

The increase in the flow velocity of the swirling flow at the tapered portion of the cylindrical cyclone chamber 1 increases the centrifugal force and causes the water droplets to adhere to the tapered inner wall surface. A group of water drops that fall along the inner wall surface due to gravity accumulates at the bottom of the outer wall cylinder 4. A discharge fan 5 is attached to the upper part of the outer wall cylinder 4. The air intake port of the exhaust fan 5 may face the cylindrical cyclone chamber 1 instead of the outer wall cylinder 4. In this case, the outer wall cylinder 4 becomes unnecessary.
If the deflector 13 is eliminated and the scattering plate 14 is disposed downstream of the cavitation bubble nozzle 2 as shown in FIG. 3, the microbubbles in the water droplets are shredded into finer submicron bubbles by the impact energy received from the plate. Thus, a water droplet group having a strong oxidizing power can be obtained.

Explanation of sign

DESCRIPTION OF SYMBOLS 1 Cylindrical cyclone chamber 2 Cavitation bubble nozzle 3 Air inflow pipe 4 Outer wall cylinder 5 Exhaust fan 6 Pump

Claims (2)

    A cavitation bubble nozzle that generates a cavitation bubble by providing a turbulent flow region, a cyclone chamber that generates a swirl flow, an air inflow pipe that faces the top of the cyclone chamber, and an exhaust fan that discharges air in the cyclone chamber An air purification apparatus using a cavitation bubble water flow, wherein the cavitation bubble nozzle faces the upper part of the cyclone chamber and the sprayed water droplets slowly descend together with the swirling air flow.     A cavitation bubble nozzle having a turbulent flow area with a rapidly expanding cross section, a cyclone chamber having a taper at the lower outlet, an air inflow pipe with its tip facing the upper part of the cyclone chamber, and air in the cyclone chamber An air purification device using a cavitation bubble water flow comprising a discharge fan for discharging air from the cavitation bubble water flow, which causes the cavitation bubble nozzle to face the upper part of the cyclone chamber and slowly drops the sprayed water droplets together with the swirling air flow.

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