EP-4736996-A1 - ULTRA FINE BUBBLE PRODUCTION DEVICE

Abstract

An ultra fine bubble production device includes: a container portion having a containment space formed therein for containing liquid and gas; a pressurizing portion configured to compress the containment space to generate, in the containment space, pressurized gas dissolved liquid including the liquid and the gas dissolved under pressure in the liquid; a holding portion configured to hold a dissolved state under pressure in which the gas is dissolved under pressure in the liquid; and a depressurizing portion configured to open, in the dissolved state under pressure, a communication path through which an inside and an outside of the containment space communicate with each other, to depressurize the pressurized gas dissolved liquid and generate ultra fine bubbles.

Inventors

• KAWAI, TSUYOSHI
• ATOBE, Shingo

Assignees

• Daicel Corporation

Dates

Publication Date

20260506

Application Date

20240425

Claims (7)

1. An ultra fine bubble production device comprising: a container portion having a containment space formed therein for containing liquid and gas; a pressurizing portion configured to compress the containment space to generate, in the containment space, pressurized gas dissolved liquid including the liquid and the gas dissolved under pressure in the liquid; a holding portion configured to hold a dissolved state under pressure in which the gas is dissolved under pressure in the liquid; and a depressurizing portion configured to open, in the dissolved state under pressure, a communication path through which an inside and an outside of the containment space communicate with each other, to depressurize the pressurized gas dissolved liquid and generate ultra fine bubbles.
2. The ultra fine bubble production device according to claim 1, wherein the pressurizing portion includes a sliding portion configured to be inserted into the container portion to form the containment space together with the container portion, the sliding portion being slidable in the container portion along an insertion direction to the container portion, the sliding portion moves relative to the container portion in the insertion direction thereby causing compression of the containment space, and the holding portion restricts, in the dissolved state under pressure, the sliding portion from moving relative to the container portion in a direction opposite to the insertion direction.
3. The ultra fine bubble production device according to claim 2, wherein the pressurizing portion includes a screw shaft portion extending along the insertion direction, the screw shaft portion having a male screw groove formed in an outer periphery of the screw shaft portion, the holding portion includes a screw hole portion into which the screw shaft portion is inserted, the screw hole portion having a female screw groove to be engaged with the male screw groove of the screw shaft portion, and the screw shaft portion moves toward the container portion in the insertion direction as the screw shaft portion is screwed and advanced into the screw hole portion.
4. The ultra fine bubble production device according to claim 1 or 2, wherein the depressurizing portion includes a valve body configured to transition from a closed state in which the communication path is closed to an open state in which the communication path is opened, and a drive portion configured to apply, to the valve body, energy for the valve body to transition from the closed state to the open state.
5. The ultra fine bubble production device according to claim 4, wherein, when the valve body is in the closed state, the valve body is fitted in the communication path to close the communication path, and the drive portion pushes the valve body from an outer side toward an inner side of the containment space to cause the valve body to transition from the closed state to the open state.
6. The ultra fine bubble production device according to claim 4, wherein the drive portion includes an igniter configured to burn an ignition agent by being supplied with operating electric power, and applies combustion energy of the ignition agent to the valve body.
7. The ultra fine bubble production device according to claim 4, wherein the drive portion includes an elastic body configured to apply elastic energy to the valve body by returning from a compressed state to an extended state in which the elastic body is extended compared to the compressed state.

Description

Technical Field The present invention relates to an ultra fine bubble production device. Background Art In recent years, applied technologies utilizing characteristics of fine bubbles have attracted attention. Bubbles having a diameter of less than 100 µm are called fine bubbles. In particular, ultra fine bubbles that are bubbles having a diameter of less than 1 µm (nano-size) are distinguished from other bubbles, and the usefulness of the ultra fine bubbles has been acknowledged in various fields. Various methods of producing ultra fine bubbles have been developed so far. For example, a production method using under-pressure dissolution is widely used, in which gas is dissolved in liquid under pressure, and then the pressure is rapidly reduced to cause supersaturation and thereby cause the gas to precipitate as ultra fine bubbles. An ultra fine bubble production device using under-pressure dissolution, which includes a container portion for containing liquid and gas, and a drive portion for pressurization in the container portion, has been proposed (for example, see Patent Document 1). In the pressurization in the ultra fine bubble production device, a time required for pressure to reach maximum pressure from the start of the pressurization is 2.0 milliseconds or less, and the maximum pressure is 4.00 MPa or more. Citation List Patent Document Patent Document 1: WO 2021/090833 Summary of Invention Technical Problem An object of the technology of the present disclosure is to provide a technology for improving the performance of an ultra fine bubble production device. Solution to Problem To solve the above problems, an ultra fine bubble production device according to the present disclosure has employed the following configuration. That is, the gist of the technology according to the present disclosure is as follows. [1] An ultra fine bubble production device including: a container portion having a containment space formed therein for containing liquid and gas;a pressurizing portion configured to compress the containment space to generate, in the containment space, pressurized gas dissolved liquid including the liquid and the gas dissolved under pressure in the liquid;a holding portion configured to hold a dissolved state under pressure in which the gas is dissolved under pressure in the liquid; anda depressurizing portion configured to open, in the dissolved state under pressure, a communication path through which an inside and an outside of the containment space communicate with each other, to depressurize the pressurized gas dissolved liquid and generate ultra fine bubbles.[2] The ultra fine bubble production device according to [1], in which the pressurizing portion includes a sliding portion configured to be inserted into the container portion to form the containment space together with the container portion, the sliding portion being slidable in the container portion along an insertion direction to the container portion, the sliding portion moves relative to the container portion in the insertion direction thereby causing compression of the containment space, andthe holding portion restricts, in the dissolved state under pressure, the sliding portion from moving relative to the container portion in a direction opposite to the insertion direction.[3] The ultra fine bubble production device according to [2], in which the pressurizing portion includes a screw shaft portion extending along the insertion direction, the screw shaft portion having a male screw groove formed in an outer periphery of the screw shaft portion, the holding portion includes a screw hole portion into which the screw shaft portion is inserted, the screw hole portion having a female screw groove to be engaged with the male screw groove of the screw shaft portion, andthe screw shaft portion moves toward the container portion in the insertion direction as the screw shaft portion is screwed and advanced into the screw hole portion.[4] The ultra fine bubble production device according to any one of [1] to [3], in which the depressurizing portion includes a valve body configured to transition from a closed state in which the communication path is closed to an open state in which the communication path is opened, and a drive portion configured to apply, to the valve body, energy for the valve body to transition from the closed state to the open state.[5] The ultra fine bubble production device according to [4], in which, when the valve body is in the closed state, the valve body is fitted in the communication path to close the communication path, and the drive portion pushes the valve body from an outer side toward an inner side of the containment space to cause the valve body to transition from the closed state to the open state.[6] The ultra fine bubble production device according to [4] or [5], in which the drive portion includes an igniter configured to burn an ignition agent by being supplied with operating electric power, and applies c