JPH10235364A - Electrostatically treating electrode for water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure also while an electrostatical treatment effect is enhanced by a method wherein a surface area of an electrode being in contact with water is increased, resistance in liquid is decreased, and a flow of fluid is straightened. SOLUTION: An electrostatically treating electrode of water is so constituted that a plurality of metal sheets being a long member having an insulating film 10a, a resin block 11 holding these metal sheets by inserting in a parallel state, a metal boss 12 in which the resin block 11 is forcedly fitted, a connection means 13 wherein rear end parts of respective metal sheets 10 inserted into the resin block 11 are connected to a high tension power source, and a filling resin 14 which fixes the rear end part of the metal sheet 10 in an insulating state by filling a space in a rear part of the boss 12 are provided. Dimensions of an electrostatic field formed in the fluid can be increased by increasing the number of the metal sheets 10. Since the metal sheet 10 is little in resistance, a pump transferring the fluid is not required to be loaded with burden. A flow of the fluid is straightened, and a water treatment performance of the electrode becomes good.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for circulating, supplying or discharging a fluid, in particular, a scale for preventing a scale from adhering to a pipe or a heat exchanger in a cold / hot water supply system, a cooling / heating air conditioning system, and accumulating the fluid. The present invention relates to an electrode for electrostatic treatment of water used to decompose and remove scales.

[0002]

In recent years, electrostatic water treatment has attracted attention as one of the physical water treatment methods, and a specific device thereof is disclosed in Japanese Patent Publication No. 7-16676. Electroprocessing electrodes are known. That is, this electrode is installed in a tank, a pipe or the like in an insulated state with water, and by applying a high voltage, the generation of scale is prevented or the accumulated scale is disassembled and eliminated. . However, since the electrode for electrostatic treatment described in the above publication has a single pipe shape as a whole, setting it in a pipe narrows the flow path of water, which not only places a burden on the pump, but also imposes a load on the pump. , The effect of electrostatic treatment may not be sufficiently exhibited. There are also points to be improved, such as increasing the surface area of the electrode that comes into contact with water to increase the effect, and simplifying the structure to reduce the cost.

[0003] The present invention has been made in view of the above problems, and an object thereof is to increase the surface area of an electrode that comes into contact with water to increase the effect of electrostatic treatment. Reduce the resistance in the fluid and rectify the flow of the fluid to produce the effect of improving the efficiency of electrostatic treatment,
Another object of the present invention is to provide an electrode for electrostatic treatment of water which has a simplified structure.

[0004]

In order to achieve the above object, an electrode for electrostatic treatment according to the present invention comprises a plurality of metal long members having an insulating film so that one of them is parallel to the other. Are held in an insulated state at their ends, and each elongated member is connected to a high-voltage power supply at its held end.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The electrostatic processing electrode of the present invention is, specifically, a plurality of metal long members having an insulating film, and a resin block for inserting and holding these long members in parallel. A metal boss for press-fitting the resin block, connecting means for connecting a rear end of each elongated member inserted into the resin block to a high-voltage power supply, and filling the space at the rear of the boss with the length. And a filling resin for fixing the rear end of the measuring member in an insulated state. Needless to say, the long member may be fixed to the metal boss in an insulated state using only the filling resin without using the resin block.

The long member is made of a metal having good electrical conductivity, such as an aluminum alloy or stainless steel, and may have any shape such as a flat plate, a pipe, and a rod. The surface of the long member is coated with a resin film or a resin is coated to form an insulating film.

[0007] A protective cap may be attached to the end of the long member. This protective cap may be attached to the tip of each long member, but by attaching the tip portions of the long members so as to be connected to each other, the long members are kept parallel and vibration is prevented, and particularly resonance is prevented. It is preferable to do so.

In the electrode for electrostatic treatment of the present invention, a plurality of metal long members having an insulating film are used. Therefore, by increasing the number of the long members, the surface area of the electrode can be made smaller than that of the conventional pipe-shaped electrode. Can be bigger. In addition, even if the overall size of the electrode is the same as that of a conventional pipe, the resistance in the fluid will be greatly reduced.By arranging the long members in parallel, the flow of the fluid will be rectified, and the electrostatic treatment will be performed. This has the effect of increasing efficiency. In addition, structurally, it is a simple structure in which a plurality of long members are simply pressed into the boss via the resin block.

[0009]

FIG. 1 is an explanatory view showing an example of an attached state of an electrode for electrostatic treatment, and FIG. 2 is a perspective view of a socket for attaching the electrode to a pipe.

In FIG. 1, a pipe 1 is a pipe through which cold or hot water flows in a cold / hot water supply system or a cooling / heating air-conditioning system used for a building or a plant, and an electrostatic treatment electrode 2 is welded to an elbow portion of the pipe 1. Attached to the socket 5. Here, in order to allow the electrode 2 to be accurately and easily applied to the pipe 1, a socket 5 having a predetermined length to which a warp 5a is welded is specially manufactured as shown in FIG. This socket 5 can make a hole after applying the curved end portion to the mounting location of the pipe 1 to mark the exact hole position on the pipe 1,
Thus, the welding operation can be performed while maintaining a predetermined depth, and the electrode 2 is machined so that the electrode 2 is screwed and tightened at a position where the electrode 2 is just in a predetermined direction. In addition, piping 1
Is a metal tube, and the electrode for electrostatic treatment 2 which is a positive electrode
Serves as a ground electrode for

When the single-phase power of 100 V / 200 V AC is input to the high-voltage power supply unit 3 with the safety device in the above mounting state, the AC power is converted to a high-voltage DC (for example, 10 V).
000 V, 1 mA), and a positive high voltage is applied to the electrode 2 through the high voltage cable 4. Due to this high voltage, an electrostatic field is formed in the water, and the dissolved organic and inorganic molecules, cations, and anions contained in the water are each surrounded by water molecules and flow. The cations are attracted to the negatively charged tube wall but do not act so strongly as to be adsorbed, and the anions are repelled and do not stick to the tube wall, so the positive and negative ions are separated and scale is prevented. You. Similarly, the anions flow away without being adsorbed by the positive electrode, and the cations are repelled, so that the positive and negative ions are separated. Therefore, as long as the electric field exists, the generation of scale is prevented.
Further, the scale adsorbed on the tube wall is gradually decomposed and eliminated by the effect of weak electrolysis by the electric field.
It does not mean that free electrons are emitted into water from a positive electrode as is commonly believed. The flow of the electrostatic field is rectification, and the more effective the surface area of the positive electrode, the more effective.

3 to 5 show a first embodiment of an electrode for electrostatic treatment. FIG. 3 is a side view of the electrode, FIG. 4 is a front view of the electrode, and FIG. 5 is a sectional view of the electrode. FIG. 5 shows a cross section in a direction perpendicular to FIG.

The electrode for electrostatic treatment of this embodiment has three strip-shaped metal plates 10, a resin block 11 which inserts and holds these metal plates 10 in parallel and at equal intervals, and press-fits this resin block 11. A metal boss 12, connecting members 13 a and connecting wires 13 b as connecting means 13 for connecting the rear end of each metal plate 10 inserted into the resin block 11 to one high-voltage cable 4, A filling resin 14 is provided for filling the rear space and fixing the rear end of each metal plate 10 in an insulated state.

The metal plate 10 is made of a metal having good electrical conductivity, such as an aluminum alloy or stainless steel. In the present embodiment, the central one of the three metal plates 10 is thicker than the outer one, whereby the natural frequency is changed to the outer side to prevent the whole resonance. The metal plate 10 is provided with an insulating film 10a on the surface after chamfering the corners except for the attachment portion of the connection means 13. This insulating film 1
No. 0a is a material having a high dielectric breakdown voltage, a low relative dielectric constant, good weather resistance, good water resistance and hot water resistance, and heat sealable, such as perfluoroethylene propylene copolymer (FEP), perfluoroalkoxyl alkane (PF
A tube made of a thermoplastic resin mainly containing a fluororesin such as A) is used, and the tube is covered with the metal plate 10 by being thermally shrunk and covered. Although a high voltage of 10 kV is experimentally sufficient if the current is about 1 mA, the insulating film 10a is sufficient to have a thickness of 0.1 mm, but in consideration of practical strength, the thickness is preferably 0.4 to 0.5 mm. desirable. After the thermal contraction, the tip of the insulating film 10a is heat-sealed and closed, and then the protective cap 10b is attached to the tip with an adhesive 10c such as an epoxy resin (EP), and each metal plate 10 is fixed with a bolt 10d and a nut 10e. At their tips, they are connected to each other. The protective cap 10b is made of an adhesive resin having weather resistance, water resistance and hot water, such as polyvinylidene fluoride (PVDF) and polysulfone (PS).
F), made of a resin such as polycarbonate (PC).
Alternatively, it may be made of a metal such as stainless steel or brass.

The resin block 11 is made of an engineering plastic having weather resistance, water resistance and hot water, such as polyvinylidene fluoride (PVDF), polysulfone (PSF),
Each of the metal plates 10 made of silicon resin (SI) or the like and covered with the insulating film 10a is exactly inserted therein, and three through-holes are formed in such a size that there is no gap. After inserting three metal plates 10 into the through holes, respectively,
The rear end is fixed and electrically connected by a, and the connection line 13b is attached.

The boss 12 is a hollow member made of metal such as stainless steel or brass or an engineering plastic such as polyferrinin sulfide (PPS) or polyetheretherketone (PEEK). A hexagonal screw head 12b is provided. Then, the portion of the metal plate 10 of the electrode is inserted from the socket 5 attached to the elbow portion of the pipe 1 by electric welding or the like, and the screw portion 12a is screwed into a male screw on the inner surface of the socket 5 to fix the electrode. Has become. in this case,
A sealing tape is wound around the screw portion 12a, the screw portion 12a is screwed into the socket 5, and the electrodes are fixed to the socket 5 in a sealed state and in a predetermined direction. Note that, for positioning, appropriate marks may be provided on the head 12b of the boss 12.

The resin block 11 has an insertion portion 11a having an outer diameter slightly larger than the inner diameter of the boss 12, and a cap portion 11b having a larger diameter on the rear side. Therefore, by pushing the insertion portion 11 a into the boss 12 in a predetermined direction, the resin block 11 is firmly fitted into the boss 12 with the cap portion 11 b abutting on the tip of the boss 12. The resin block 11 has a boss 12 and an embedded screw 11
It is good to fix with c so that it does not come off. The boss 12
Is formed with a tapered cut-out portion 12c when the resin block 11 is inserted into the tip thereof.
1 is easy to insert. Further, the boss 12 is easily inserted when heated in advance, and contracts when cooled, thereby firmly fixing the resin block 11.

As described above, the metal plate 10 can be mounted in a state of protruding from the boss 12 simply by pressing the resin block 11 into the boss 12. As a result, the structure is simple, few parts are used, and the manufacturing process is greatly simplified.
Production costs will be reduced.

After the resin block 11 with the metal plate 10 is fitted and fixed to the boss 12, a filling resin 14 such as epoxy resin (EP) is cast from the back of the boss 12, and
Is securely fixed together with the connection means 13 in an insulated state. Then, the other end of the connection wire 13b attached to the connecting member 13a is attached to the high-voltage connector 15, and this is connected to a screw 16
To the boss 12. In FIG. 5, 12d
Is a cut-out portion provided to prevent the filling resin 14 from coming off.

6 to 8 show a second embodiment of the electrode for electrostatic treatment. FIG. 6 is a side view of the electrode, FIG. 7 is a front view of the electrode, and FIG. 8 is a sectional view of the electrode. FIG. 8 shows a cross section in a direction perpendicular to FIG.

The electrode for electrostatic treatment of this embodiment includes eight metal pipes 20, a resin block 21 for inserting and holding these metal pipes 20 in parallel and at equal intervals, and a metal block for press-fitting the resin block 21. , A connecting member 23 a and a connecting member 23 b as connecting means 23 for connecting the rear end of each metal pipe 20 inserted into the resin block 21 to one high-voltage cable 4. And a filling resin 24 for filling the space and fixing the rear end of the metal pipe 20 in an insulated state.

The metal pipe 20 is made of the same material as the metal plate 10, that is, a metal having good conductivity such as an aluminum alloy or stainless steel. And the metal pipe 20
Is provided with an insulating film (not shown) on the surface thereof, and a ring-shaped protective cap 20a is attached so that the metal pipes 20 are connected to each other at their ends. For the insulating film, a tube made of the same material as described above is used.
0 at the tip of the same resin stopper 20b as the protective cap 20a
Is inserted, and then the tube is heat-shrinked in a state where the tube is put on the metal pipe 20 to form the tube. After heat-shrinking, the tip is heat-sealed or bonded, and a protective cap 20a made of the same material as described above is placed on the metal pipe 20.
Over an adhesive made of epoxy resin (EP) and are connected to each other.

The resin block 21 is made of the resin block 1 described above.
It is made of the same material as that of No. 1 and has eight through-holes in a size such that each metal pipe 20 coated with an insulating film just enters and has no gap. After the eight metal pipes 20 are inserted into the through holes, the connecting members 23 are connected.
The rear end is fixed and electrically connected by a, and the front end of the cable 4 is attached to the connecting member 23a.

The boss 22 is made of the same material as that of the boss 12, and has a tapered screw portion 22a and a hexagonal screw head 22b on the outer periphery. Then, the portion of the metal pipe 20 of the electrode is inserted from the socket 5 attached to the elbow portion of the pipe 1 by electric welding or the like, and the screw portion 22a is screwed into a male screw on the inner surface of the socket 5 to fix the electrode. Has become.

The resin block 21 is the same as the resin block 1 described above.
Like the resin block 11, it has an insertion portion 21a having an outer diameter slightly larger than the inner diameter of the boss 22, and a cap portion 21b having a larger diameter on the rear side. Therefore, by pushing the insertion portion 21a into the boss 22 in a predetermined direction, the cap portion 21b is pressed.
The point that the resin block 21 is firmly fitted into the boss 22 in a state where the resin block 21 is in contact with the tip of the boss 22 is the same. Also,
The boss 22 has a tapered incision 22c at its tip.
Are formed to facilitate insertion of the resin block 21.

Resin block 21 with metal pipe 20
Is fixed to the boss 22 and then filled with a filling resin 24 such as an epoxy resin (EP) to fix the rear end of each metal pipe 20 together with the connecting member 23a in an insulated state. Reference numeral 25 denotes a rubber bush, and reference numeral 26 denotes a casing. The high-voltage cable 4 is held by screws 27 and fixed to the boss 22 using these. In addition, in FIG.
Reference numeral 4 denotes a tapered incision portion provided so as not to come off integrally with the resin block 21 via the metal pipe 20.

Although the present invention has been described with reference to two embodiments, the present invention is not limited to these embodiments, and the design may be appropriately changed within the scope of the claims. Needless to say, it is good. For example, in the above electrode, a metal plate or a metal pipe was used as the long member,
A metal rod may be used, or a metal plate or a metal pipe of the embodiment may have a deformed shape. Further, a flat cable having a conductive wire such as a piano wire can be used as a long member with an insulating film.

[0028]

As described above, according to the electrode for electrostatic treatment of the present invention, the total surface area can be increased by increasing the number of long members to be used. The effect can be increased. In addition, the resistance of the long member in the fluid is much smaller than that of the conventional pipe type, so that there is no need to put a burden on the pump for transferring the fluid, and large electrodes are installed even for small diameter pipes. It becomes possible. Further, the flow of the fluid is rectified by making the elongated member parallel to the flow of the fluid, so that the water treatment performance of the electrode is improved. And the production cost can be reduced because of the simple structure in which the long member is simply sandwiched by the resin.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an attached state of an electrode for electrostatic treatment according to the present invention.

FIG. 2 is a perspective view of a socket for attaching an electrode to a pipe.

FIG. 3 is a side view showing a first embodiment of the electrode for electrostatic treatment.

FIG. 4 is a front view of the same.

FIG. 5 is a sectional view of the electrode for electrostatic treatment shown in FIG. 3;

FIG. 6 is a side view showing a second embodiment of the electrode for electrostatic treatment.

FIG. 7 is a front view of the same.

FIG. 8 is a sectional view of the electrode for electrostatic treatment shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Electrode for electrostatic treatment 3 High voltage power supply 4 High voltage cable 5 Socket 10 Metal plate 10a Insulating film 11 Resin block 12 Boss 13 Connecting means 14 Filling resin 15 Connector 16 Mounting screw 20 Metal pipe 21 Resin block 22 Boss 23 Connecting means 24 Filled resin 25 Rubber bush 26 Casing 27 Screw

Claims (3)

[Claims] A plurality of metal elongated members having an insulating film are held in an insulated state at one end thereof so as to be in a parallel state, and each of the elongated members is held at the held end. An electrode for electrostatic treatment of water, which is connected to a high-voltage power supply. 2. A plurality of metal long members having an insulating film, a resin block for inserting and holding these long members in a parallel state, a metal boss for press-fitting the resin block, and the resin block. Connecting means for connecting the rear end of each long member inserted into the boss to a high-voltage power supply, and a filling resin for filling the space at the rear of the boss and fixing the rear end of the long member in an insulated state. An electrode for electrostatic treatment of water, comprising: 3. The electrode for electrostatic treatment of water according to claim 1, wherein a protective cap is attached to a tip of the long member.