JPH074593B2 - Scale prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention prevents the generation of rust and the adhesion of scales in containers such as pipes and heat exchangers by passing a liquid through a magnetic field. More particularly, the present invention relates to a scale prevention device that uses a ring-shaped ferrite magnet as a magnetic field generation source and is formed of a structure with a yoke (joint iron).

[Prior Art] It has been conventionally known that it is effective to pass water through a magnetic field before supplying it in order to prevent scale in a heat exchanger or the like and to prevent generation of algae in a water tank. Have also been proposed. Generally, as the magnetic field of these devices
Although 1000 to 8000 gauss or more is effective, 8,000 gauss or more is extremely difficult to make and is too expensive as an industrial product, which is unsuitable. It is also known that an alnico magnet containing cobalt, aluminum, nickel and iron as main components is effective as a magnetic field generation source.
Also, ferrite magnets have been used effectively, but when using ferrite magnets, water is passed through the ring of the ring-shaped magnet without devising a magnetic circuit, or the ferrite magnets are stacked in layers and arranged. A method of passing water between layers has been proposed.

[Problems to be Solved by the Invention] However, since the alnico magnet has a high energy product and can be used in the form of an elongated rod,
Although there is an advantage that the scale prevention device can be configured without making the outer diameter much larger than the outer diameter of the pipe, the device using the alnico magnet is expensive, and the magnet is made of metal. Therefore, there is a problem that the magnet itself is corroded in the portion that comes into contact with water.

Further, in the case of a ferrite magnet, there is a problem that the amount of treated water or the strength of the magnetic field must be reduced if the structure becomes large or if it is made small, and the strength of the magnetic field when using the ferrite magnet is There was also the problem that the effect of scale prevention could hardly be expected, as it was extremely small at 200 to 2000 gauss.

INDUSTRIAL APPLICABILITY The present invention solves the above-mentioned problems, eliminates the above-mentioned drawbacks of a ferrite magnet when using a ferrite magnet, and is a scale prevention device that is small and can be made at a low price. Then, the term "scale prevention device" is used).

[Means for Solving the Problem] As a result of repeated studies to solve the above problems and achieve the above object, the present inventor has sandwiched both sides of a ring-shaped ferrite magnet with yokes and placed a pole in the ring. The present invention has been completed by finding that the purpose can be achieved by providing a structure in which a water passage is provided. That is, according to the present invention, a ring-shaped ferrite magnet, a ring-shaped yoke (a) that is in contact with one surface of a ring of the ferrite magnet, and the other surface of the ring that is in contact with water to be treated. And a plate-shaped yoke (b) having a water passage hole and an iron which is provided inside the ring of the ring-shaped yoke (a) with a gap and is connected to the plate-shaped yoke (b) to form a magnetic circuit. It is a scale prevention device consisting of a pole.

The present invention will now be described with reference to the accompanying drawings.

FIG. 1 is a plan view (a) and a diametrical sectional view (b) showing the basics of the scale prevention device of the present invention, and FIG. 2 is a diametrical view showing another embodiment of the present invention as a composite structure. FIG. 3 is a plan view (a) shown as an example in which the water passage holes are provided outside the magnetic field inner diameter as still another embodiment of the present invention.
FIG. 4 is a diametrical cross-sectional view showing another example of the present invention in which magnetic circuits are arranged in a flat plate to form a magnetic plate.

1 is a ring-shaped ferrite magnet, and an anisotropic barium or strontium ferrite magnet is particularly effective. Reference numeral 2 denotes a yoke (a), which is subjected to a corrosion prevention treatment, is formed in a ring shape, and is provided on one surface of the ring of the ring-shaped ferrite magnet 1. 3 is a yoke (b)
In addition, a plurality of water passage holes 6 formed in a flat plate shape, subjected to corrosion prevention treatment, and through which water to be treated passes are provided so as to exist in the ring of the ring-shaped ferrite magnet 1. Four
Is an iron pole, one end side of which is provided inside the ring of the yoke (a) with a gap 5 provided inside the ring of the ring-shaped ferrite magnet 1, and the other end side of which is on the flat plate surface of the yoke (b). Connected to the magnet yoke (b)
-Iron pole-yoke (a) -forms the magnetic circuit of the magnet.

Since the scale prevention device of the present invention is configured in this way, the desired magnetic field is the yoke (a) and the iron pole 4
The strength of the magnetic field generated in the gap 5 between the magnet and the magnet depends on the size and characteristics of the magnet, the width of the gap, the thickness of the yoke, or the diameter of the iron pole sufficient to pass the amount of magnetic flux that the magnet can generate. Generally, 2000 to 8000 gauss can be obtained, though it depends on the shape of the tip of the iron pole and the internal shape of the yoke (a).

In order to obtain a stronger magnetic field, it is effective to use two permanent magnets facing each other. That is, as shown in FIG. 2, the ring-shaped ferrite magnets 1 are joined to both surfaces of the yoke (a) so that the same poles of the ring-shaped ferrite magnets face each other, and the end faces of the respective ring-shaped ferrite magnets 1 are joined to each other. This is a composite type magnetic circuit in which a yoke (b) having water passage holes 6 is arranged. By using this composite magnetic circuit, the magnetic field strength is 25% compared to the structure using one magnet.
~ 60% can be improved.

In order to make the present invention effective as a scale prevention device or an algae generation prevention device, the position of the water passage hole 6 of the yoke (b),
It is also important to improve the size. That is, in the magnetic circuit of the present invention, the magnetic flux generated in the ring-shaped ferrite magnet 1 is generated through the yoke (b) and the iron pole 4 to generate a strong magnetic field in the gap 5. In places other than the above, leakage of magnetic flux must be prevented as much as possible. However, the water that has passed through the gap 5 needs to pass through the yoke (b) with almost no resistance. Therefore, the yoke (b) requires a large water passage hole 6, that is, a hole area equal to or larger than the water passage area of the gap 5. (This water passage does not have to have a circular cross section, but a circular shape is generally the most inexpensive and can be manufactured.) By opening the water passage 6, the area through which the magnetic flux passes in the yoke (b). Becomes smaller, and the magnetic flux becomes
It leaks greatly in the vicinity of, and as a result, the magnetic field in the gap 5 may decrease by 50% compared to when there is no hole, depending on the position and size of the hole. When making a device adapted to a water flow rate of 15 A (outer diameter 21.7 mm) or more, the phenomenon that the magnetic field in the gap 5 is lowered due to the effect of the water flow hole 6 was observed without exception. To solve this phenomenon, it is effective to use a large ring-shaped magnet, but there is a risk that the device will become large. To prevent this, the third
As shown in the drawing, the position of the water passage hole 6 is provided on the outer side of the inner surface of the ring-shaped ferrite magnet 4 so as to prevent leakage of magnetic flux and ensure a sufficient amount of water. Is. This water passage needs to have a product of the area of one hole and the number thereof, that is, the total area of the water passages, so that the required water passage amount can be secured, and the distance between the water passages is small. The total amount of magnetic flux passing through the yoke (b) between the water passage holes can be determined by calculation so as to exceed the total amount of magnetic flux generated by the ring-shaped ferrite magnet. As a result, as described above, the water passage hole satisfies a requirement for both the amount of water and the amount of magnetic flux by providing a part or all of the water passage closer to the outer side of the ring-shaped ferrite magnet than to the inner side of the magnet. It can be done. However, in this case, the water passage hole is partially or wholly closed by the end face of the ring-shaped ferrite magnet. (B) It is necessary to cut the inside so that sufficient water can pass therethrough so that the water passage hole is not even partially closed.

Since the present invention is small and can be made particularly thin,
As shown in FIG. 4, by arranging a plurality of holes in the flat plate 7 for perforated plate such as vinyl chloride and arranging a plurality of magnetic field generating mechanisms of the present invention side by side therein, the occupied volume is small and the treatment It is also effective to use it as a large scale preventive device, that is, as a magnetic plate.

[Examples] Next, examples of the present invention will be described.

Example 1 As an apparatus compatible with the steel pipe for piping 15A (21.7 mm), an outer diameter of 7
Ring-shaped anisotropic barium ferrite magnet with 0 mm, inner diameter 37 mm, and thickness 20 mm, outer diameter 64 mm, inner diameter 33.4 mm, thickness 5 mm
The ring-shaped yoke (a) of the magnet is brought into contact with one surface of the ring of the magnet, and the flat yoke (b) having an outer diameter of 64 mm and a thickness of 15 mm is brought into contact with the other surface of the ring of the magnet. An iron pole with an outer diameter of 24 mm (29 mm only at the tip) is provided inside the ring, with one end connected to the yoke (b) surface. The yoke (b) has a center-to-center pitch of 37 mm and a diameter of 4.5 mm as water passage holes. 16 circular water holes are provided, and they are stored in a stainless steel tube with an inner diameter of 70 mm (about 1/2 of the area of the water holes is outside the inner surface of the magnet), and hose openings are attached to both ends to prevent scale. The device was formed.

The magnetic field strength of the gap of this device is 65 at the inner pole surface.
00 gauss, 5700 gauss on inner surface of yoke (a), 2.2 m
It was about 6100 gauss at the center of the gap of m, and it was possible to secure the amount of water passing through the steel pipe with an outer diameter of 21.7 mm.

Example 2 The thickness of the yoke (a) in Example 1 was set to 7 mm, and the same combination of the ring-shaped anisotropic barium ferrite magnet and the yoke (b) as in Example 1 was applied to both sides of the yoke (a). Contacted to form a composite structure. The magnetic field strength was 9600 gauss on the iron pole surface, 8500 gauss on the inner surface of the yoke (a), and 9000 gauss at the center of the gap.

Example 3 Using a ring-shaped anisotropic barium ferrite magnet having an outer diameter of 120 mm, an inner diameter of 60 mm and a thickness of 30 mm, a device having a composite structure was prepared in the same manner as in Example 2. A total of 16 water passage holes were provided with a center-to-center pitch of the water passage holes of 80 mm and an outer diameter of 11 mm. As a result, we were able to secure a water volume of 40A (48.6mm) in diameter. The magnetic field strength at this time is about 4500 when the gap is 8.6 mm in order to secure the amount of water in the 40 A pipe.
Gauss, about 8100 Gauss when the gap was 6.5mm to secure the water volume of 32A (outer diameter of pipe 42.7mm).

Example 4 A ring-shaped anisotropic barium ferrite magnet having an outer diameter of 60 mm, an inner diameter of 32 mm and a thickness of 10 mm was used, and the yoke (a) had an outer diameter of 54 mm,
Inner diameter 23 mm, thickness 4 mm, yoke (b) is outer diameter 54 mm, thickness 4
A magnetic circuit device was formed in the same manner as in Example 1 by using 20 mm mm and iron poles. In this case, the magnet inner diameter is made larger than the iron pole diameter, and the gap is 1.5m.
Since the water volume was reduced to m, the hole position of the water passage was
It is not necessary to make it larger than the inner diameter of the magnet, and eight 5 mm water passage holes were formed. This alone is sufficiently effective as a scale prevention device, but in order to increase the water flow rate, the outer diameter is 298 mm,
Eight 55 mm holes were punched in a vinyl chloride plate having a thickness of 5 mm, and the magnetic circuit device was attached to each of them to prepare a scale-like scale preventing device having an outer diameter of 298 mm and a thickness of about 20 mm. An epoxy resin coating was applied as a rustproof treatment.

[Effects of the Invention] The present invention uses a ring-shaped ferrite magnet as a magnetic source, mounts yokes on both side surfaces of the magnet, and provides iron poles inside the ring to form a magnetic circuit and a water passage. Therefore, by passing through the device of the present invention, it is possible to effectively prevent the generation of scale and the generation of algae, and moreover, it is possible to manufacture it at a lower cost than that using the conventional alnico magnet. The effect is recognized.

[Brief description of drawings]

FIG. 1 is a plan view (a) and a diametrical cross-sectional view (b) showing a basic example of the scale preventing device of the present invention, and FIG. 2 is a diametrical view showing another embodiment of the present invention as a composite structure. FIG. 3 is a plan view (a) shown as an example in which the water passage holes are provided outside the magnetic field inner diameter as still another embodiment of the present invention.
FIG. 4 is a diametrical cross-sectional view showing another example of the present invention, in which the basic examples of FIG. is there. 1 ... Ring-shaped ferrite magnet, 2 ... Yoke (a), 3 ...
Yoke (b), 4 ... Iron pole, 5 ... Gap, 6 ... Water passage hole, 7 ... Plate for flat plate.

Claims (3)

[Claims] 1. A ring-shaped ferrite magnet, a ring-shaped yoke (a) which is in contact with one flat surface of a ring of the ferrite magnet, and an untreated water which is in contact with the other flat surface of the ring. A flat plate-shaped yoke (b) having water passage holes,
A scale prevention device comprising: an iron pole that is provided inside the ring of the ring-shaped yoke (a) with a gap and is connected to the flat-plate-shaped yoke (b) to form a magnetic circuit. 2. A flat yoke (b) having ferrite magnets bonded to both sides of a ring-shaped yoke (a) so that the same poles face each other, and each of the ring-shaped ferrite magnets has a water passage hole at an end surface thereof. The scale prevention device according to claim 1, which has a composite structure in which a scale is provided. 3. The scale prevention device according to claim 1, wherein the water holes provided in the flat yoke (b) are provided outside the inner diameter of the ring-shaped ferrite magnet.