JPH0223078A - Jet generator using electric field - Google Patents

Abstract

PURPOSE:To easily generate a jet stream by opening unequal holes in an electrode and differentiating intervals or arrangements of the holes. CONSTITUTION:A porous plate electrode 13 of a jot generating electrode is composed of a platelike electrode material 18 in which a plurality of large holes 19a and small holes 19b are alternately opened. Holes opened at the material 18 operate as a wide region W at the large hole 19a and as a narrow region S at the small hole 19b. When a high voltage is applied between the electrode 13 and a surface electrode, liquid directly under the electrode 13 is at highest pressure and the liquid of the region of the large hole 19a is lowest. Accordingly, the liquid is fed from the holes 19b between both the electrodes, and fed as jet stream from the hole 19a. Thus, the jet stream can be generated in the liquid without presenting a movable unit.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an improvement in a device that generates a jet flow in a liquid by applying a high voltage between electrodes placed opposite each other in the liquid. More specifically, the present invention relates to improvements in electrodes used in the jet generator.

The present inventors have already proposed a method of generating a jet stream in a liquid using a high voltage electric field. (Unexamined Japanese Patent Publication No. 59-
663425) This method will be explained with reference to diagram Pt5a. In the liquid 1, a ring-shaped electrode 3 is provided at a predetermined distance from the surface electrode 2, and a high voltage is applied between both electrodes. . Then, a strong electric field and a weak electric field are created around the electric wire that constitutes the ring-shaped electrode 3, and depending on the strength of the electric field, the liquid passes from the outside of the ring-shaped electrode 3 through the gap between the two electrodes and is surrounded by the electric wire. ring-shaped electrode 3
It passes through the interior 5 of the jet stream 4 and flows out as a jet stream 4.

However, in this known method, since the jet stream t is ejected from the inside 5 of the narrow ring-shaped electrode 3, the overall flow is too small and the entire liquid cannot be sufficiently flowed and stirred.

In order to improve the above-mentioned drawbacks, as shown in FIGS. 4 and 5, a large number of electric wires 15 are made to intersect vertically and horizontally, and the intervals between the electric wires 15 are varied, so that the mesh electrodes 13 with different meshes (irregularly spaced electrodes) are formed. ), and a jet generating device in which this mesh electrode 13 is placed opposite to the surface electrode 12 has already been proposed.

When a high voltage is applied between the electrodes configured as described above, an electric field is formed, and lines of electric force act between each linear electrode material 15 of the electrode 13 and the surface electrode 12.
2, the electric field in a region S with a narrow interval 16 formed by the electrode material is stronger than the electric field in a region W with a wide interval 16. When an electric field acts on the liquid, the pressure of the liquid increases by (1/2) εE2 (ε: dielectric constant, E: electric field strength), so the pressure is greatest right below each linear electrode material 15, The region S where the spacing 16 formed by the electrode material 15 is narrow is the next largest, and the pressure in the region W where the spacing is wide and the electrode material is formed is the smallest.

As a result, as shown by the arrows in FIG. 4, the liquid passes through the narrowly spaced region S formed by the wire rods and passes through the surface 1! A flow toward i12 is generated, and this flow changes direction at the surface electrode 12 and becomes a jet flow toward the wide area W.

15th! , 21, ■ represents the flow of liquid flowing between the electrodes.

That is, the pressure of the liquid in the narrow region S where the electric field is strong is greater than the pressure of the liquid in the wide region W where the electric field is weak, and the direction of the jet is determined by the pressure gradient. In the narrow area S, the linear electrode materials 15 are in contact with each other, so if the same voltage is applied as compared to the wider area W, the electric field in this area will be stronger, and the pressure of the liquid will increase accordingly. , the pressure gradient increases and the jet flow velocity increases.

The linear electrode material 15 constituting the electrode 13 is made of brass,
A wire material such as stainless steel is used, and the diameter d of the wire material is 0.
5~5II1ms The spacing S between the narrow areas of both electrode materials is 1~
A range of 50+am is preferred.

The width of the wide area W with respect to the narrow area S is 1.25 to 2
The range of 0 times, that is, the ratio of the interval W of the wide area to the interval S of the narrow area, is preferably in the range of S/W = 0.05 to 0.8, and the interval between the surface electrode 12 and the unevenly spaced electrode 13 is 0
．． A spacing of 5-50+1Ia1 is suitable, and D/d≧
5 to 3 to the electrode configured in the above range such that the value is 1.5.
When a voltage of 0 KV is applied, a jet stream is effectively ejected from a wide area of the electrode material.

(Problems to be Solved by the Invention) However, since the mesh electrode 13 as described above has a complicated structure, it is relatively difficult to improve the manufacturing accuracy, and there is a risk that the manufacturing cost will increase.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a jet generating device that can easily generate a jet flow over the entire surface of a surface electrode and that can easily manufacture the electrode.

(Means for Solving the Problems) In order to achieve the above object, in the jet generating device according to the present invention, the other electrode facing the surface electrode is a porous plate-shaped electrode punched out of a plate material, and the distance between adjacent holes is The electrodes are formed by forming electrodes at unequal intervals by forming holes in different arrangements or forming adjacent holes with different diameters.

By drilling unequal holes as described above, by varying the spacing and arrangement of the holes, the gaps between adjacent electrodes are unequal, so that the surface electrodes and the When a high voltage is applied between the porous plate electrodes, liquid flows between the porous plate electrodes from the narrowly spaced areas, and a jet stream flows out from the widely spaced areas.

(Example) Hereinafter, examples of the present invention will be explained with reference to the drawings.

FIG. 1 shows a perforated plate electrode 1 of a jet generating electrode according to the present invention.
This shows an example of No. 3.

The perforated plate electrode of the present invention is implanted from a plate-shaped electrode material 18 in which a plurality of large holes 19a and small holes 19b are alternately bored. The holes drilled in the plate-shaped electrode material 18 correspond to the spacing 16 in FIG. Because of the arrangement, when a high voltage is applied between the perforated plate electrode 13 and the surface electrode 12 with this configuration as in the previous embodiment, the liquid directly under the perforated plate electrode 13 has the highest pressure, and the large pores 19a Since the pressure of the liquid in the region is lowest, the liquid flows between the two electrodes through the small hole 19b and flows out as a jet stream through the large hole 19a.

The holes in the perforated plate electrode 13 may be punched, and the shape of the holes is not limited to circular, but may be rectangular or elliptical, but adjacent holes are arranged so that their sizes are at least different. As for the equivalent diameter W of the small hole, the ratio S/W is preferably in the range of 0.05 to 0.8 as in the above embodiment.

Also, the distance from the surface electrode is 0.5-5III A range of is suitable.

Further, as the liquid for generating the jet stream, any liquid having an electrical conductivity of 10-''Ω-1·ll-1 or more, such as Freon 113, can be effectively used.

FIG. 2 shows unevenly spaced electrodes 13 of the jet generating device of the present invention.
Another embodiment of the present invention is shown, and is composed of a plate-shaped electrode material 18 in which holes of the same size and diameter are bored so that every other hole is bare. In this case, when a high voltage is applied, the two adjacent holes 20a work in a wide area W, and the pressure in this area becomes smaller than the pressure in the area S of the single hole 20t+, and therefore As in the embodiment, the liquid flows between the two electrodes through the small diameter hole 20b and flows out in a jet form through the two adjacent holes 20a. There may be a boundary between these two holes, or the two holes may be connected.

(Effects of the Invention) As is clear from the above description, according to the present invention, a jet flow can be generated in a liquid without the presence of a moving part, so it can be applied to various fields. sell.

For example, it is applicable to use in a micro-weight environment, specifically, to a liquid water generating device, a pump, a heat exchange device, etc. in space.

In particular, the application to heat exchangers is extremely small! By applying it not only to the 111 environment, but also to heat exchange devices such as high-performance ground heat exchangers, heat exchangers for power generation, and transformer cooling devices,
It can promote convective heat transfer, boiling heat transfer. In this case, it is sufficient to use the area between the plane electrodes as a heat transfer surface, and it can be easily applied to existing devices. In addition, in the case of boiling or evaporative heat exchange that involves the generation of bubbles, the generation of jets stirs and moves the liquid itself, and the bubbles attached to the upper surface electrode are weakened, and the transfer effect at the surface electrode is greatly increased. improve.

Further, according to the present invention, electrodes having irregular intervals can be obtained easily and at low cost.

Furthermore, the plate-shaped punched electrode of the present invention has higher durability than one using rice grain material, and does not deform during long-term use, so reliability is improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an unevenly spaced electrode made of plate-shaped electrodes according to an embodiment of the present invention, FIG. 2 is a plan view showing an embodiment of a pond according to the present invention, and FIG. 3 is a plan view showing a conventionally known jet. A sectional view for explaining the generator, Fig. 4 is the jet generator V of the existing proposal.
FIG. 5 is a sectional view showing the device, and FIG. 5 is a plan view of FIG. 4. 18: Plate electrode material 19a: Large hole 19b: Small hole 20a: Adjacent hole 20b knee 1
11 German Hole River 1 2 ■ Figure Figure 3

Claims (1)

[Scope of Claims] A device in which a high voltage is applied to a pair of electrodes placed opposite each other in a liquid with a predetermined gap therebetween, and the liquid is subjected to a force depending on the strength of an electric field generated in the liquid to generate a jet flow, comprising: A jet generating device using an electric field, wherein one of the pair of electrodes is a planar surface electrode, and the other electrode is a perforated plate electrode formed by perforating a plate material.