IN-LIQUID PLASMA DEVICE

• US 20190322551A1
• Filed: 07/03/2019
• Published: 10/24/2019
• Est. Priority Date: 02/03/2017
• Status: Active Grant

• Current Assignee: Nihon Spindle Manufacturing Company Limited (Sumitomo Heavy Industries Limited)
• Original Assignee: Nihon Spindle Manufacturing Company Limited (Sumitomo Heavy Industries Limited)
• Inventors: Asami, Keiichi, Onishi, Keiichiro
• Granted Patent: US 11,124,434 B2
• Time in Patent Office: Days
• CPC Class Codes: B01J 19/08 Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor application of shock waves B01J3/08
• CPC Class Codes: C02F 1/34 with mechanical oscillations
• CPC Class Codes: C02F 1/4608 using electrical discharges
• CPC Class Codes: C02F 2101/30 Organic compounds
• CPC Class Codes: C02F 2303/04 Disinfection
• CPC Class Codes: F04D 7/02 of centrifugal type
• CPC Class Codes: H05H 1/247 using discharges in liquid media
• CPC Class Codes: H05H 1/46 using applied electromagnetic fields, e.g. high frequency or microwave energy H05H1/26 takes precedence
• CPC Class Codes: H05H 1/4645 Radiofrequency discharges

Abstract

There is provided an in-liquid plasma device including a tubular flow channel in which a liquid flow, and a cavitation generator and a voltage application unit which are disposed in the tubular flow channel. The cavitation generator generates cavitation in the liquid inside the tubular flow channel. The voltage application unit is located in the tubular flow channel so as to generate plasma by applying a voltage to the liquid in which the cavitation is generated. The cavitation generator has a throttle portion whose inner diameter is smaller than other sites in the tubular flow channel. The throttle portion has an upstream side inclined surface located on an upstream side of a narrowest site of the throttle portion, and a downstream side inclined surface located on a downstream side of the narrowest site of the throttle portion.

Claims

1. An in-liquid plasma device comprising:

a tubular flow channel in which a liquid flows; and

a cavitation generator and a voltage application unit which are disposed in the tubular flow channel,

wherein the cavitation generator generates cavitation in the liquid inside the tubular flow channel,

wherein the voltage application unit is located in the tubular flow channel so as to generate plasma by applying a voltage to the liquid in which the cavitation is generated,

wherein the cavitation generator is configured to have a throttle portion whose inner diameter is smaller than other sites in the tubular flow channel, and

wherein the throttle portion is configured to have

an upstream side inclined surface which is an inclined surface located on an upstream side of a narrowest site of the throttle portion, and

a downstream side inclined surface which is an inclined surface located on a downstream side of the narrowest site of the throttle portion.

2. The in-liquid plasma device according to claim 1,

wherein a shape of the downstream side inclined surface is expressed by a sine function.

3. The in-liquid plasma device according to claim 1,

wherein the upstream side inclined surface and the downstream side inclined surface have a symmetrical shape with respect to the narrowest site.

4. The in-liquid plasma device according to claim 1,

wherein the downstream side inclined surface has such a shape that a flow of the liquid is not separated.

5. The in-liquid plasma device according to claim 1,

wherein the cavitation generator has at least two throttle portions adjacent to each other in series, and the voltage applied to the liquid by the voltage application unit in an upstream throttle portion located on an upstream side is higher than the voltage applied to the liquid by the voltage application unit in a downstream throttle portion located on a downstream side of the upstream throttle portion.

6. The in-liquid plasma device according to claim 1,

wherein the cavitation generator has at least two throttle portions adjacent to each other in series, and the inner diameter of an upstream throttle portion located on an upstream side is larger than the inner diameter of a downstream throttle portion located on a downstream side of the upstream throttle portion.

7. The in-liquid plasma device according to claim 1,

wherein a plurality of the tubular flow channels are arranged in parallel.

8. The in-liquid plasma device according to claim 1, further comprising:

a centrifugal type suction pump,

wherein the liquid flowing out of the tubular flow channel is supplied to the suction pump, and the liquid discharged from the suction pump is supplied to the tubular flow channel.