JPH0666677A - Bubble generator - Google Patents

Abstract

PURPOSE:To provide a bubble generator for generating hydrogen bubbles from a cathode of thin metal wire placed in the water in which bubbles having differ ent diameters can be generated concurrently. CONSTITUTION:The bubble generator comprises a cathode 2 made of thin metal wires stretched substantially in parallel, at an interval, on the surface of a rotary disc 1, and an anode 3 fixed to the rotary disc 1 while opposing to the cathode 2. Flow rate on the thin metal wire of the cathode 2 decreases in the central part thereof whereas increases on the outer periphery thereof through the rotation of the rotary disc 1. Consequently, hydrogen bubbles having large diameter are generated from the central part of the cathode while simultaneously hydrogen bubbles having small diameter are generated from the outer periphery of the cathode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bubble generating device used in a test device or the like for evaluating the performance of a homing device using acoustic and laser such as torpedoes.

[0002]

2. Description of the Related Art In a conventional bubble generator, a fine metal wire is placed in water as a cathode, an anode is placed in the same water, and an appropriate voltage is supplied by a DC pulse generator to generate minute hydrogen bubbles in the cathode. Has been generated. In this bubble generator, the size of the bubble can be changed by changing the thickness of the thin metal wire, the current, and the speed of water flowing into the thin wire.

[0003]

In the conventional apparatus for generating hydrogen bubbles in water, the size of the generated bubbles can be adjusted depending on the conditions such as the thickness of the thin wire for the electrode, the interval of the pulse current and the flow velocity of the water flow. Bubbles with various diameters cannot be generated.

In a test for simulating air bubbles in the wake of a ship to evaluate the performance of a homing device, it is necessary to mix air bubbles with various diameters at the same time. The bubble generating device that can generate only the bubbles of the above cannot be used.

The present invention is intended to solve the above problems and to provide a bubble generator capable of simultaneously generating bubbles having various diameters.

[0006]

[Means for Solving the Problems]

(1) The bubble generating device of the present invention comprises a rotating plate which rotates about a central axis, a cathode which is stretched substantially parallel to the surface of the rotating plate with a gap and which is composed of a thin metal wire attached to a rotating disc. An anode that is provided on the rotating disk so as to face the cathode and is electrically insulated from the cathode, and a power supply that applies a voltage between the cathode and the anode are provided. (2) Further, the bubble generating device of the present invention comprises a rotating plate, a cathode composed of a fixed thin wire stretched substantially parallel to the surface of the rotating plate with a gap, facing the cathode, and electrically connected to the cathode. A fixed anode insulated from the cathode and a power source for applying a voltage between the cathode and the anode are provided.

[0007]

In the present invention (1), when the rotary plate rotates in water, a relative speed difference is generated between the rotary plate and water. However, since the peripheral speeds of the rotary plate are different in the radial direction, a gap is formed. The flow velocity of water on the metal thin wire of the cathode stretched almost parallel to the surface of the rotating plate is small at the central portion of the rotating plate and large at the outer peripheral portion. Therefore, even if the thickness and the current of the metal thin wire of the cathode are the same, large bubbles are generated in the central portion where the flow velocity is small, and small bubbles are generated in the outer peripheral portion.
In this way, it is possible to simultaneously generate bubbles having different diameters.

In the present invention (2), when the rotary plate rotates in water, a water flow is generated in the vicinity thereof. The flow velocity of this water is low in the central portion of the rotating plate and high in the outer peripheral portion, so that this flow of water hits the thin metal wire on which the cathode is fixed. Therefore, even if the thickness and current of the metal thin wire of the cathode are the same, large bubbles are generated in the central portion where the flow velocity is low, and small bubbles are generated in the outer peripheral portion where the flow velocity is high. In this way, bubbles with different diameters can be generated at the same time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG.

Reference numeral 1 denotes a rotating disk which is rotated around the central axis 4a by a motor 4 in the direction of an arrow through the central axis 4a. The rotating disk 1 has a slight gap on the upper surface thereof. A cathode 2 made of a fine metal wire stretched in the diametrical direction of the rotating disk 1 in a direction substantially parallel to the upper surface of the rotating disk 1 is electrically insulated from the rotating disk 1. Reference numeral 3 is an anode of a metal rod which is provided on the upper surface of the rotating disk 1 and faces the cathode 2 and is electrically insulated from the rotating disk 1 and the cathode 2. A DC voltage pulse generator 5 is connected to the cathode 2 and the anode 3 via a slip ring 6 provided on the central shaft 4a.

In this embodiment, when the rotary disc 1 rotates in water, a relative speed difference is generated between the water and the rotary disc 1, and a flow on the thin metal wire forming the cathode 2 occurs. To do.
This flow velocity is small in the central portion of the rotating disc 1 and large in the outer peripheral portion. Therefore, even if the thickness of the thin metal wire of the cathode 2 and the current are the same, a large hydrogen bubble is generated in the central portion and a small hydrogen bubble is generated in the outer peripheral portion. In this way, it is possible to simultaneously generate bubbles having different diameters.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the rotating disk 1 is rotated by the motor 4 via the central shaft 4a as in the first embodiment, but the cathode 2 and the anode 3 are located above the rotating disk 1. It is attached to a fixed support base 7 provided so as to face the. That is, on the lower surface of the fixed support 7 in the form of an elongated plate extending substantially in the diametrical direction of the rotating disk 1, the rotating disk 1 rotates in the diametrical direction with a slight gap from the upper surface of the rotating disk 1. It consists of thin metal wires stretched almost parallel to the upper surface of the plate 1,
A cathode 2 that is electrically insulated from the support base 7 is provided. In addition, it faces the cathode 2 and supports the support 7 and the cathode 2.
A metal rod anode 3 electrically insulated from the above is provided on the lower surface of the support base 7. The cathode 2 and the anode 3 are connected to a DC voltage pulse generator 5, respectively.

In this embodiment, as the rotating disc 1 rotates, a water flow in the rotating direction of the rotating disc 1 is generated in the vicinity thereof, and the flow velocity is small in the central part and large in the outer peripheral part. Therefore, the flow velocity on the thin metal wire forming the cathode 2 is
It is small in the central part and large in the outer peripheral part. As a result, even if the thickness of the thin metal wire of the cathode 2 is the same as the current, large hydrogen bubbles are generated in the central portion and small hydrogen bubbles are generated in the outer peripheral portion. In this way, in this embodiment, it is possible to simultaneously generate bubbles having different diameters.

A third embodiment of the present invention will be described with reference to FIG. In this embodiment, the large bubbles generated in the central portion of the rotating disk 1 and the small bubbles generated in the outer peripheral portion are not separated from each other in the second embodiment.

That is, a vertically extending duct 9 covering the upper side of the support base 7 of the second embodiment is provided, and an impeller 8 is provided in the duct 9, and the impeller 8 is extended upward to a central shaft 4a. The motor 4 is rotated via the.

In this embodiment, as the impeller 8 rotates, a flow of water flowing upward while rotating in the duct 9 is generated, and large air bubbles generated in the central portion of the rotating disk 1 and outer peripheral portions are generated. The formed small bubbles are mixed and can be prevented from separating.

In the third embodiment, the impeller 8 and the duct 9 are provided on the support base 7 of the second embodiment, but above the rotary disc 1 of the first embodiment. It is also possible to provide these in the part of.

[0018]

EFFECTS OF THE INVENTION The present invention has the constitutions set forth in claims 1 and 2 of the claims, whereby the flow velocity of water on the cathode made of a fine metal wire is small in the central portion of the rotating plate and the outer circumference is small. It is possible to generate large air bubbles in the central portion and small air bubbles in the outer peripheral portion. Therefore, according to the present invention, it is possible to simultaneously generate bubbles having different diameters.

[Brief description of drawings]

1 shows a first embodiment of the present invention, FIG. 1 (a) is a plan view thereof, and FIG. 1 (b) is a longitudinal sectional view thereof.

FIG. 2 shows a second embodiment of the present invention, FIG. 2 (a) is a plan view thereof, and FIG. 2 (b) is a longitudinal sectional view thereof.

3 shows a third embodiment of the present invention, FIG. 3 (a) is a plan view thereof, and FIG. 3 (b) is a longitudinal sectional view thereof.

[Explanation of symbols]

 1 Rotating Disc 2 Cathode 3 Anode 4 Motor 4a Center Axis 5 DC Voltage Pulse Generator 6 Slip Ring 7 Support 8 Impeller 9 Duct

Claims (2)

[Claims] 1. A rotating plate, a cathode made of a thin metal wire attached to the rotating disc and extending substantially parallel to the surface of the rotating disc with a gap, and provided on the rotating disc facing the cathode. And a power source for applying a voltage between the cathode and the anode, and a bubble generator. 2. A rotating plate, a cathode made of a fixed metal wire extending substantially parallel to the surface of the rotating plate with a gap, a fixed anode facing the cathode and electrically insulated from the cathode, And a power source for applying a voltage between the cathode and the anode.