Provided is a fine bubble generation device that comprises a bubble generator for mixing a liquid continuously supplied from a liquid supply source with a gas supplied from a gas supply means, generating fine bubbles, and ejecting a gas-liquid mixed liquid, which is a mixture of the fine bubbles and the liquid. The bubble generator includes: a confluence pipe formed as an independent component and having a liquid introduction part for supplying a liquid to the inside, a gas introduction part for supplying a gas to the inside, and a discharge part for generating fine bubbles and discharging a gas-liquid mixed liquid containing the fine bubbles; and a tubular internal component assembled and accommodated inside the confluence pipe, and having therein a flow passage that allows the liquid supplied from the liquid introduction part to flow to the discharge part. The internal component includes a downstream inner pipe formed as an independent component and disposed on the downstream side in the direction in which the liquid flows, and an upstream inner pipe formed as an independent component and disposed on the upstream side. The upstream inner pipe has a through-hole bored for introducing the gas supplied from the gas introduction part into the flow passage. The downstream inner pipe is coupled to the upstream inner pipe inside the confluence pipe. The flow passage extends between the liquid introduction part and the discharge part, and allows communication between the upstream inner pipe and the downstream inner pipe in a substantially coaxial manner.
B01F 23/2375 - Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm for obtaining bubbles with a size below 1 µm
B01F 23/2326 - Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
B01F 25/312 - Injector mixers in conduits or tubes through which the main component flows with Venturi elementsDetails thereof
A bubble generating device is disclosed which includes: a bubble generator including a tubular body, a liquid introduction port, a gas introduction port, and a discharge port; and a gas supply unit including a gas supply port, a pressurized gas being supplied to the bubble generator through the gas supply port, wherein the flow passage of the bubble generator extends substantially along a same axis, a plurality of reduced diameter portions each having an inner diameter reduced are provided along a direction along which the liquid flows, and gas-liquid mixing portions are provided downstream of the respective reduced diameter portions in a contiguous manner, each of the gas-liquid mixing portions having an inner diameter larger than a minimum inner diameter of each of the plurality of reduced diameter portions, and the gas introduction port of the bubble generator is formed of a plurality of through holes.
B01F 23/2375 - Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm for obtaining bubbles with a size below 1 µm
B05B 7/04 - Spray pistolsApparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
B01F 25/314 - Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
B01F 23/232 - Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
B01F 25/433 - Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
B01F 23/2326 - Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
The present invention relates to a microbubble generation device which can generate microbubbles with a high microbubble concentration in a liquid and a small bubble diameter. The device is characterized by being provided with: a bubble generator that comprises a tube body having an internal liquid flow path, a liquid inlet for introducing a liquid into the flow path, a gas inlet for introducing a gas into the flow path, and an outlet for discharging a gas-liquid mixture from the flow path; and a gas supply means that has a gas supply port for supplying pressurized gas to the bubble generator. The flow path in the bubble generator extends from the liquid inlet to the outlet in a substantially coaxial line. Multiple reduced-diameter portions, in which the inner diameter is reduced towards the flow direction of the liquid, are provided in the flow path. Gas-liquid mixing units that have an inner diameter larger than the smallest inner diameter in the reduced-diameter portions are provided continuously downstream of the reduced-diameter portions. Near the reduced-diameter portion provided furthest downstream in the flow path, the gas inlet of the bubble generator is provided as multiple through-holes arranged along the circumferential direction of the outer wall of the tube body, and the gas inlet communicates with the gas supply port of the gas supply means.
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